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PVC foamed products - unbalanced characterization of various auxiliaries (Ⅱ)

3. Internal lubricantThe commonly used inner lubricants include stearic acid, 60, monoglyceride, 316, etc.Insufficient internal lubrication, poor dispersion of materials, uneven plasticization, difficult to control the thickness of products, foam board in the middle of the thick on both sides of the thin, may also appear white belt, and cavity adhesion and local overheating and other phenomena;Too much internal lubrication, foam products brittle, heat resistance decline, and under a certain temperature and pressure melting effect into external lubrication, resulting in lubrication imbalance;Lack of internal and external lubrication, melt viscosity is large, plasticizing torque is large, melt wall adhesion phenomenon is serious, the material surface has yellow decomposition line, the surface smoothness is poor, mechanical properties of products reduced;Internal and external lubrication are excessive, plasticizing torque is small, melt plasticization is obviously insufficient, although the smoothness of products but pressure point adhesion is poor, serious impact on the mechanical properties of products;Less internal lubrication, more external lubrication, significantly extend the plasticizing time, reduce the plasticizing torque, product molding difficulties, brittle;More internal lubrication, less external lubrication, plasticizing time significantly shortened, there are more serious wall adhesion phenomenon, thermal stability time shortened, the surface of products have yellow line decomposition;4, calcium powderFoaming products generally choose about 1200 mesh of light calcium is appropriate, calcium powder is easy to absorb moisture and form bubbles on the surface of products, such as silver grain, affect the appearance and physical properties, so pay attention to the rainy season storage.When the particle size of calcium carbonate is too large, it is easy to mix unevenly, the plasticizing time of the mixture is delayed, and the screw torque is low.When the particle size of calcium carbonate is too small, agglomeration is likely to occur, which changes from small particles to large ones, similar to the consequence of too large particles.When the dosage of calcium carbonate is too low, the number of foam holes decreases and the foaming rate decreases.When the dosage of calcium carbonate is too much, the relative content of resin in the component decreases, the melt strength decreases, and the fracture of the plate is easy to appear.

PVC foamed products - unbalanced characterization of various auxiliaries (I)

1. StabilizerThe most commonly used stabilizers for PVC foamed products are lead salt stabilizer and calcium zinc stabilizer. With the increasingly stringent requirements for environmental protection and the increasingly high cost performance of calcium zinc stabilizer, the application of calcium zinc stabilizer has become more and more extensive.Lack of stabilizer, yellow, paste, brittle products, strength reduction, low foaming rate;If the stabilizer is too much, the foaming agent will decompose in advance, and the gas will overflow from the feeding hole and the vacuum hole.2. External lubricantFoaming products on the application of the most commonly used outside the lubrication of paraffin, PE wax, paraffin wax easy precipitation, so the general use of PE wax.Insufficient external slip, temperature in zone 4 and 5 of the extruder is not easy to control, easy to overheat, large bubbles, string bubbles, yellowing and rough surface of the plate; The friction shear heat increases, causes the material decomposition, the surface becomes yellow, the paste;Excessive external slip, poor plasticization, resulting in mold cavity scaling and product surface precipitation, easy to appear leucorrhea, uneven wall thickness and some symptoms in the surface irregular movement phenomenon;

What is the production molding technology of PVC plastic sheet?

PVC plate is a relatively common plastic plate, it has a good performance, the following we will understand its production molding process what:The first is free foaming, in which the melt expands unrestricted as soon as it leaves the die and, after a short period of time, enters a larger size setting device. The advantage of this method is simple process, suitable for the production of thickness of 2 ~ 6mm of surface gloss PVC sheet products.The second method is the internal foaming method, which can produce PVC plates with complex cross-section shapes. The products have the characteristics of smooth surface, high hardness and low density in the core area.The third is the co-extrusion method, it is through a combination of the head, the use of two combined extruder respectively extruded non-foam surface layer and foam core layer, according to the need to adjust the varieties or formulations of two layers of plastic, so that the products reach the density and size required by the standard.The above methods have their own characteristics in formula composition, processing technology and so on.

Application of rutile titanium dioxide in alkyd blending varnish

Rutile titanium dioxide can disperse the visible light more effectively, and has a stronger uv absorption capacity. As a result of its photochemical activity and uv absorbency, the layer failure of anatase titanium dioxide limited the service life of the coating. As pure titanium dioxide is a photocatalytic carrier, it can absorb ultraviolet rays, but it can cause photochemical catalysis. After surface envelop treatment, the probability of photochemical reaction is low. Thus, through surface treatment to avoid contact with water and oxygen, the resulting catalysis produces free radicals.The presence of titanium dioxide after surface treatment reduces the chances of direct degradation of the coating, thus prolonging the service life of the coating. However, titanium dioxide with different weather resistance specifications showed different photocatalytic degradation, and rutile titanium dioxide significantly reduced the photocatalytic degradation rate. The use of rutile titanium pigment to make white or light color blending paint is obviously superior to rutile titanium dioxide in terms of gloss retention, color retention, film thickness loss and quality loss. The quality of rutile titanium dioxide can be improved to a higher level.Therefore, the use of rutile titanium pigment to make white or light color blending paint is conducive to the sustainable development of the paint industry and conservation of resources, on this basis, it is possible to vigorously promote the new generation of alkyd blending paint.

Do you really know CPE?

Because the CPE molecule does not contain double chains, it has good weather resistance, flame resistance and thermal stability, which are superior to PVC, low cost and excellent performance. Soluble in aromatic hydrocarbons and halogenated hydrocarbon, does not dissolve in fat hydrocarbon, above 170 ℃ decomposition, release hydrogen chloride gas, it has stable chemical structure, excellent aging resistance, flame resistance, cold resistance, weatherability, free coloring, chemical resistance, ozone resistance and electrical insulation and processability, and good compatibility with PVC, PE, PS and rubber blending to improve its property.Effect of CPE additive amount on PVC:The impact strength of PVC increases rapidly with the addition of CPE when the amount of addition is less than 10 minutes, but the impact strength of PVC increases little when the amount of CPE is further increased. Therefore, it is advisable to add 8-10 portions of CPE as an impact agent. Meanwhile, with the increase of CPE, the tensile strength of PVC blends continues to decline and the elongation at break increases. For example, if the product of tensile strength and elongation at break is used to indicate its toughness, it will obviously increase with the increase of the amount of CPE added.Have literature thought in 8 above, CPE than precipitation in the saturated solubility of PVC and PVC, PVC as the sea, the island of CPE for micro phase separation structure, thus greatly improve the impact strength of PVC, also have literature that CPE in more than six servings, can form a network in the formula, thus impact modified effect, but the CPE at low content (e.g., 1), can not form a network in the formula system, also can't more than its saturated solubility and precipitation in PVC, its impact in the formula of modified to little effect.

Application of polyethylene wax

Main features of PE wax:Has low viscosity, high softening point, good properties such as hardness, non-toxic, good thermal stability, high temperature and low volatile, the pigment dispersion, both excellent external lubricity, and strong internal lubrication, can improve the production efficiency of plastic processing, moisture resistant performance is good at room temperature, chemical resistant ability, excellent, can improve the appearance of the finished productScope of application of PE wax:Due to its excellent external lubrication and strong internal lubrication, and its good solubility with polyethylene, polyvinyl chloride, polypropylene, etc., it can be used as the lubricant in extrusion, rolling and injection processing.It can improve the processing efficiency, prevent and overcome the bonding of film, pipe and sheet, improve the smoothness and glossiness of finished products, and improve the appearance of finished products. As a concentrated masterbatch dispersant of various thermoplastic resins and a lubricant dispersant for filling and degrading masterbatches, it can improve the processing performance, gloss, lubrication and thermal stability of HDPE, PP and PVC. As the lubricant of cable insulation material, it can enhance the diffusion of filling agent, improve the extrusion forming rate and increase the mold flow. As the rubber processing assistant, it can enhance the diffusion of filling agent, improve the extrusion forming rate, increase the mold flow and facilitate the demoulding. Good light and chemical resistance, can be used as a carrier of pigment, can improve the abrasion resistance of paint and ink, improve the dispersibility of pigments and fillers, prevent pigment from sinking to the bottom, can be used as a flat polish for paint and ink. As a natural or synthetic fabric softener and lubricant, improve wear resistance, tear strength, crease resistance and non - ironing sewing ability, reduce needle cutting and adjust tactility. It can improve the gloss, durability, hardness and abrasion resistance of paper, increase water resistance and resistance, and increase the beauty of paper. Various kinds of paraffin can be added to improve the performance of its excellent electrical insulator performance, added to insulating oil, paraffin or microcrystalline paraffin to increase the softening temperature, viscosity and insulation performance, can be used for cable insulation, capacitors and transformer winding moisture-proof coating.In addition, can also be used to make leather shoes oil, candles, crayons, cosmetics, leather agents, hot melt adhesive.Main application scope: it can be widely used in making color masterbatch, granulation, plastic steel,PVC pipe, hot melt adhesive, rubber, shoe polish, leather polish, cable insulation, floor wax, plastic profile, ink, injection molding and other products.

What are the characteristics of calcium and zinc stabilizers?

1. The range of processing is narrow, and the processing technology requirements should be strictly implemented.Compared with the traditional composite lead thermal stabilizer, the long-term thermal stability of calcium and zinc thermal stabilizer is still relatively poor, and the processing time is long and easy to yellow, and the sensitivity to process temperature is also high.2. The volatile content is high, and the formulation is suggested to use a lubricant with high melting point and low volatility.Compared with traditional composite lead heat stabilizer, calcium and zinc heat stabilizer has high organic content, which can easily lead to higher precipitation, and the choice of lubricant is more prudent. Ester lubricant can effectively balance the fluidity and demoulding of plastics during processing, the production cycle is long, not easy to separate out, and can be widely used in the formulation of calcium and zinc stabilizer.

What are the characteristics of calcium and zinc stabilizers

1. The range of processing is narrow, and the processing technology requirements should be strictly implemented.Compared with the traditional composite lead thermal stabilizer, the long-term thermal stability of calcium and zinc thermal stabilizer is still relatively poor, and the processing time is long and easy to yellow, and the sensitivity to process temperature is also high.2. The volatile content is high, and the formulation is suggested to use a lubricant with high melting point and low volatility.Compared with traditional composite lead heat stabilizer, calcium and zinc heat stabilizer has high organic content, which can easily lead to higher precipitation, and the choice of lubricant is more prudent. Ester lubricant can effectively balance the fluidity and demoulding of plastics during processing, the production cycle is long, not easy to separate out, and can be widely used in the formulation of calcium and zinc stabilizer.

The difference between light calcium carbonate and heavy calcium carbonate

1. The appearance quality of light calcium carbonate is different from that of heavy calcium carbonate(1) Different packing densityThe obvious difference between heavy calcium carbonate and light calcium carbonate lies in the different packing density of products. Generally, the packing density of heavy calcium carbonate products is larger, 0.8-1.3g /cm3. However, the packing density of light calcium carbonate products is smaller, usually 0.5-0.7g /cm3. The packaging volume of products can also roughly distinguish the heavy calcium carbonate and light calcium carbonate products. Generally, the heavy calcium carbonate products are mostly 25kg/ bag, and the packaging volume of products is small, while the packaging volume of light calcium carbonate products of the same quality is obviously large. Some nanometer calcium carbonate products are also packed in 15kg/ bag or 20kg/ bag.(2) whitenessDue to the relatively large amount of impurities and particles in the products of heavy calcium carbonate, the whiteness of the products is generally 89%~93%, and a very few products can reach 95%, while the whiteness of the products of light calcium carbonate is mostly 92%~95%, and some products can reach 96%-97%, which is also the main reason why the products of light calcium carbonate are mostly used for filling high grade or light color products.(3)waterThe moisture content of heavy calcium carbonate products is relatively low and stable at the same time, generally 0.2-0.3%. The moisture content of some high grade heavy calcium carbonate products can reach about 0.1%. Ordinary light calcium carbonate product moisture is 0.3%~0.8%, sometimes can have certain fluctuation. Nanometer calcium carbonate products also vary with the type of water used in the products. Some products have moisture below 0.1, while some products have moisture around 1.5%.2,The grain size and crystal shape of light calcium carbonate and heavy calcium carbonate are different(1) Different particle sizesThe particle size of heavy calcium carbonate products is between 0.5 and 45um, and the smaller the particle size, the higher the price. Currently, there is no industrialized production of nano-sized heavy calcium carbonate, only a very small amount of particles of about 100nm in some fine calcium products. The particle size of ordinary light calcium carbonate is generally 0.5~15um, and that of nanometer calcium carbonate is generally 20~200nm. The identification method can be used for transmission or scanning electron microscopy analysis, which is more intuitive and accurate, and can also be determined by specific surface area measurement or particle size analysis.(2) Different crystal typesDue to mechanical crushing and grading of heavy calcium carbonate products, the grain shape is irregular, also known as unshaped. The particle size of precipitated calcium carbonate products is generally more regular, such as ordinary light calcium carbonate mainly in spindle shape, nanometer calcium carbonate mainly in cubic shape.(3)Different performance during applicationIn the application process, the heavy calcium carbonate products are mainly used in the paper, rubber and plastics industries, and the volume of filling is generally large, mainly used as volume filler, to reduce the manufacturing cost of the applied products. Light calcium carbonate products have a wide range of application fields, mainly with volume filling, while nanometer calcium carbonate products tend to be used as functional filler such as modification or reinforcement in the application process, with less filling. The main application areas of light calcium carbonate products are plastics, rubber, coatings, adhesive and ink.

Factors to be considered in selecting titanium dioxide

Several factors to pay attention to in choosing titanium dioxide:1. Relative densityAmong the commonly used white pigments, titanium dioxide has the smallest relative density. Among the white pigments of the same quality, titanium dioxide has the largest surface area and the highest pigment volume.2. Melting and boiling pointsThe melting and boiling points of the anatase titania are virtually non-existent as the anatase transform into rutile at high temperatures. Only rutile type titanium dioxide has a melting point and boiling point, rutile type titanium dioxide melting point is 1850 ℃, the melting point of (1830 + 15 ℃ in air and oxygen enrichment in the melting point is 1879 ℃, melting point is associated with the purity of titanium dioxide. The boiling point of rutile type titanium dioxide as (3200 + 300 ℃), titanium dioxide under the high temperature slightly volatile.3. Dielectric constantBecause of its high dielectric constant, titanium dioxide has excellent electrical properties. The orientation of titanium dioxide crystals should be considered when determining some physical properties of titanium dioxide. The dielectric constant of anatase titanium dioxide is low, only 48.4. Electrical conductivityTitanium dioxide has the properties of semiconductor, its electrical conductivity increases rapidly with the rise of temperature, and it is also very sensitive to hypoxia. The dielectric constant and semiconductor properties of rutile titanium dioxide are very important to the electronic industry.5. The hardnessThe rutile titanium dioxide is 6~6.5 and the anatase titanium dioxide is 5.5~6.0 according to the scale of 10 mohs hardness, so the rutile titanium dioxide is adopted to avoid wear of spinneret in chemical fiber extinction.6. HygroscopicAlthough titanium dioxide is hydrophilic, its hygroscopicity is not too strong, rutile is smaller than anatase. The hygroscopic property of titanium dioxide is related to its surface area, large surface area and high hygroscopic property.7. Thermal stabilityTitanium dioxide is of good thermal stability.Dispersibility 8.A uniform mixture of titanium dioxide and resin is formed by dispersing and stirring the clumps of titanium dioxide (clumps and clumps) in storage or packaging. Good dispersion can not only eliminate the phenomenon of speckle and streaks in the final product, but also guarantee the maximum light scattering efficiency. Special attention should be paid to the following three points:The dispersibility of the titanium grade varies with the manufacturing process. For example, the grade of titanium dioxide treated with inorganic oxide surface is usually easier to disperse in the liquid system (plasticizers, plasticizers) than the untreated grade. But on the other hand, without the surface treatment of the grade usually easy to disperse in the dry mixing grinding (dryblending) such as polyethylene, polystyrene, or other molded with the resin manufacturing process.An individual titanium dioxide particle cannot be broken. No matter how much energy is involved in the agglomeration process, when the bound agglomerations are broken down, they are simply the separation of the particles from each other.Dispersion (dispersion), the use of the word is often vague. For example, some of the "dispersion" problems are actually problems of insufficient dilution on the formulation, while insoluble thick spots are left in the plastics.Titanium dioxide is a popular pigment in plastics applications because it provides the best scattering effect in low pigment content. In addition to optical properties, other important product characteristics may also determine the level of titanium dioxide for special purposes.9. Optical propertiesIn the selection of titanium dioxide, we need to consider the basic optical properties such as adaptability, color intensity, background color and color (color). The flexibility and the color of the white pigment strength shows its efficiency of light scattering, resilience shows white opaque pigment use plastic system capacity, and the intensity of the color it shows white paint on the colored plastic system provided by the whiteness, whiteness and brightness (brightness). Because it is easier to measure, the intensity of coloring is most commonly used to indicate the scattering efficiency of white pigments. In order to measure the relative strength of color, 0.008 grams of carbon black were added to each gram of titanium pigment sample. The mixed black pigment group (Masterbatch) was used to disperse the plastics, and the resulting gray plastics were made into even, opaque sheets or moldedchips. Titanium dioxide with the maximum light scattering efficiency provides the lightest shades of gray and the best light reflection.

Where can titanium dioxide be used in addition to coating industry?

Application of titanium dioxide:Pigment grade titanium white powder is mainly used in coating, paper making, plastic, rubber, printing ink, chemical fiber and other industries.Titanium sharp titanium powder is suitable for indoor coatings and products.Rutile titanium dioxide is suitable for outdoor coatings and products.Non-pigment grade titanium white powder is mainly used in enamel, capacitor, electrode, etc.Coating industry is a large user of titanium white powder, especially rutile titanium white powder, most of which is consumed by the coating industry. The paint made of titanium white powder has bright colors, high covering power, strong coloring power, low consumption and various kinds, which can protect the stability of the medium, strengthen the mechanical strength and adhesion of the paint film, prevent cracks, prevent ultraviolet ray and water from penetrating, and extend the life of the film.Quality requirements for titanium dioxide for coating:A. Good whiteness;B. Good abrasion and wettability;C. good weather resistance;D. Good chemical stability;E. Small size, large covering power, high color dissipation power, good opacity and gloss.The plastic industry is the second largest user of titanium white powder. Adding titanium white powder into plastic can improve the heat resistance, light resistance and weather resistance of plastic products, improve the physical and chemical properties of plastic products, enhance the mechanical strength of products, and extend the service life.Paper industry is the third largest user of titanium white powder, as a paper filler, mainly used in high grade paper and thin paper. Adding titanium white powder in the paper, can make the paper with better whiteness, good gloss, high strength, thin and smooth, printing without penetration, light quality. Titanium white powder for papermaking generally USES the sharp titanium white powder without surface treatment, which can play the role of fluorescent whitening agent and increase the whiteness of paper. But laminated paper requires the use of surface treatment of rutile type titanium white powder to meet the requirements of light resistance, heat resistance.Ink industry: high - grade ink in indispensable white pigments. Inks containing titanium white powder are durable, non-discoloration, good surface moisture, easy to disperse. The inking industry USES the titanium white powder has the rutile type, also has the sharp titanium type.Textile and chemical fiber industry is another important application field of titanium white powder. Titanium white powder used in chemical fiber is mainly used as a extinction agent. Because the sharp titanium type is softer than the golden red type, the sharp titanium type is generally used. Surface treatment is generally not required for chemical fiber titanium dioxide, but surface treatment is required for some special varieties to reduce the photochemical effect of titanium dioxide and avoid the degradation of the fiber in the photocatalysis of titanium dioxide.Rubber: not only used as coloring agent, but also has the function of reinforcing, anti-aging and filling. Titanium white powder is added to white and color rubber products. Under sunlight, it is resistant to sun exposure, non-cracking, non-discoloration, and has high elongation rate and acid and alkali resistance. Rubber with titanium white powder, mainly used in automobile tires and rubber shoes, rubber floor, gloves, sports equipment, generally in the sharp-titanium type. However, when used in automobile tire production, a certain amount of rutile products are often added to enhance its ability to resist ozone and ultraviolet rays.Cosmetics: because titanium white powder is non-toxic, far superior to lead white, so almost all kinds of incense powder use titanium white powder to replace lead white and zinc white. Only need to add 5-8% titanium white powder in flavor powder can get permanent white, make perfume more slippery and greasy, have adhesion, absorption and covering power. Titanium dioxide can reduce the feeling of greasy and transparent in water powder and cold cream. Titanium dioxide is also used in other spices, sunscreens, soap, white soap, shaving cream and toothpasteCeramics: titanium white powder is also used in the manufacture of enamels. The transparent ceramic glaze has the advantages of light quality, strong impact resistance, good mechanical performance, bright color and no pollution. Generally, it is high temperature resistant titanium sharp white powder.

A series of technologies of cold extrusion products for profiles

The main equipment used is the conical twin screw extruder.1. The shape and size of the blanks formed by the cooling finalizing device (forming table) from the nozzle of the extruder are similar to the requirements of the products. The required shape and size can be obtained only through the cooling finalizing device, and the quality of the profiles is also affected. Finalize the mesa have a vacuum to finalize the design water tank, use commonly 3-5 vacuum pump to complete the finalize the design water and vacuum degree, and completed by 2-4 sets of circulating pump of cooling water circulation, water pressure for 1-3.5 bar, temperature, general control in 15 + / - 1 ℃. Generally, the negative pressure of main profile dry shaping is between -0.5mpa and 0.7mpa, while the vacuum negative pressure of vortex tank is generally between -0.002 and -0.013mpa. The main advantage of vortex tank is good cooling effect, uniform cooling and accurate molding size. The shaping table can be adjusted horizontally and vertically to align with the head mold.2, traction device (pull out machine) traction device is continuous extrusion necessary auxiliary device, its role is to give by the head of extrusion has been preliminary forming profiles, provide a certain amount of traction and speed, to overcome the friction generated in the cooling process, make the profile with uniform speed pulling out from after heating device, for conform to the requirements of the profile. The traction pressure is generally set as 0.2-0.3mpa. If the pressure is too high, the profile will be deformed.3, cutting gear cutting device is abnormal cut lengths of device, as required when the traction device for cooling to finalize the design after the profile setting distance, profile trigger discharge rack travel switch, cutting saw briquetting pressure profiles, pneumatic cylinders drive motor and cutting saw blades from down to up, high speed rotation blade, cut off the profiles, sawdust by dust collection device for playback. The cutting speed should not be too fast, and the cutting speed is too fast, which may lead to the fracture or even fracture of the profile.4. After cutting, the shaped materials of the unloading frame are placed on the bracket smoothly by the unloading frame and packaged and loaded as required.

What effect does titanium dioxide have besides serving as plastic assistant agent?

In the plastic industry, plastic auxiliaries are indispensable members, and they provide better performance for plastics, so that they can be better used in production. In addition to being a plastic assistant, titanium dioxide is also widely used in many industries.The main application fields of titanium white powder: coating, plastic, ink, paper making, among which coating accounts for 60%, plastic accounts for 20%, paper making accounts for 14%, and other (including cosmetics, chemical fiber, electronics, ceramics, enamel, electrode, alloy, glass, etc.) accounts for 6%.Titanium white powder in the rubber industry not only as a plastic coloring agent, but also has the function of reinforcing, anti-aging and filling. Titanium white powder is added into white and color rubber products. Under sunlight, it is resistant to sun exposure, non-cracking, non-discoloration, high stretch rate and acid and alkali resistance. Rubber with titanium white powder, mainly used in automobile tires and rubber shoes, rubber floor, gloves, sports equipment, generally in the sharp-titanium type. However, it is used in the production of automobile tires. A certain amount of rutile products are often added to enhance the ability to resist ozone and ultraviolet rays.Titanium white powder is also widely used in cosmetics. Because titanium white powder is nontoxic, far superior to lead white, almost all kinds of incense powder use titanium white powder to replace lead white and zinc white. Only 5% to 8% of the titanium white powder must be added in the powder to get permanent white, making the spice more slippery and greasy, with adhesion, absorption and covering power. Titanium dioxide can reduce the feeling of greasy and transparent in water powder and cold cream. Titanium dioxide can also be used in other spices, sunscreen, soap, white soap, and toothpaste.Cosmetic grade titanium dioxide is divided into oil and water - based titanium white powder. Due to its stable chemical properties, high refractive index, high opacity, high hiding power, good whiteness and non-toxic, it has been widely used in the cosmetic field and has the effect of beauty and whitening.

What factors should be considered in the application of titanium dioxide?

Titanium white powder is an important fine chemical raw material, the chemical composition of titanium dioxide (TiO2), it is a kind of white inorganic pigment with many applications and great market demand. Titanium white powder commodity divides into two kinds: one kind is the gold red stone type titanium white powder, it bears the light, the weather resistance is strong, is used for the production outdoor coating and the product; The other type is the sharp titanium white powder, the light resistance is worse than the rutile type, mainly used in the production of indoor coatings and products. Titanium white powder is widely used in coating, plastic, papermaking, ink, medicine, fiber, cosmetics, etc.Factors to consider when choosing titanium dioxide:1.Color factorColor is an important technical index for marking pigments. Titanium white powder is called "the king of white pigment", the color index of titanium white powder is whiteness. Even the same chemical composition of titanium white, because the technology, raw materials, equipment, technology level also can produce the different color, different color shade is depends on the chemical composition, but more importantly, the decisive factor is often its particle shape, size, size distribution, crystal structure, impurity content, etc.2. Covering power factorThe optical nature of the covering force is caused by the difference between the refractive index of the pigment and the surrounding medium. Rutile titanium white powder refractive index is 2.71, sharp titanium type is 2.55, it is the white pigment with the highest hiding power. Cover effect is mainly due to the scattering caused by titanium dioxide, or due to the existence of non-ferrous material absorption or above two reasons to make incident light intensity drops, cover phenomenon occurs. Therefore, the main reason to determine the covering power of titanium white powder is not only chemical composition and crystal shape, but also related to the particle shape, particle size and particle size distribution of titanium white powder.3.Factors of coloring powerColoring power is an important characteristic index of titanium dioxide, which is the ability of the mixture to display its own pigment when mixed with another pigment. That is to say, for a white pigment, it is mixed with a dark color, the lighter the color of the mixture, indicating that its coloring (color dissipation) is stronger.4. Oil absorption factorThe amount of oil absorbed is also one of the important pigment properties of titanium white powder, because it involves the filling state of titanium white powder in the colorant, and can show its dispersibility in the medium. In the paint industry, it is used to estimate the consistency of paint before mixing, guide the formulation of paint, and preliminarily calculate the pigment volume concentration (PVC(5680, -40.00, -0.70%) according to the following formula.Chemical constituentTitanium dioxide chemical composition determines the chemical properties of titanium pigment, it is the main sign mutual difference between pigment, it besides reflecting the pigments series of performance, such as whiteness, decolorization, oil absorption thereof, has a very big effect on the application performance, such as weather, dispersion, etc.5.Factors of light and weather resistanceThe light and weather resistance of titanium white powder is an important index to measure the application performance of titanium white powder. Only after the application of titanium white powder to relevant application fields (such as automobile paint, profile, etc.), this index is meaningful. So white light fastness and weather resistance refers to the one in the field of light fastness and weather resistance, in addition to measure the light fastness and weather resistance of titanium white carrier to ensure that the application of weathering resistance is better than white. The main factors influencing the weatherability of titanium white powder include its chemical composition, chemical morphology of coating material, crystal structure and application formula.6.Gloss factorThe glossiness of titanium white powder is an important index to measure the application performance of titanium white powder. Only after applying titanium white powder to relevant application fields (such as automobile paint, ink, profiles, masterbatch, etc.), this index is meaningful.