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Performance and application of PE pipe and PVC pipe

1. The relationship between toughness and flame retardancy of PEOrdinary PE toughness is very good, better than PVC pipe. But the concept that everybody comes out is to be based on common PE tubing character.For coal mine pipe sources, flame retardant and antistatic.For antistatic PVC or PE, the insulation is good, the surface resistivity of up to 1012-15 Ω, need antistatic agent to reduce to 1 * 106 Ω surface resistance, the amount and type of adding antistatic agent is not in the difference. However, PVC itself is flame retardant, it can easily meet the flame retardant standards set by mt-181, and PE is flammable material, need to add a lot of flame retardant agent to meet the flame retardant standards of mt-181, its impact resistance will decline lower than PVC pipe. Therefore, at present, some mine PE pipe can not meet the flame retardant standard, is this reason, no or less with flame retardant, reduce the manufacturing cost, but also avoid the tube too brittle phenomenon.2. PricePE raw material manufacturing, in the world at present only one channel, is the use of petroleum in the mouth of light oil such as naphtha cracking, produce ethylene, ethylene polymerization, produce different brands, different specifications of polyethylene. Therefore, its price is closely related to the international crude oil price.To make the coal mine use PE pipe, need to add antistatic masterbatch and flame retardant masterbatch, masterbatch, is to add a certain amount of antistatic agent in PE raw material or flame retardant, or both, mixed granulation, again after masterbatch and at present very little pipe factory can produce masterbatch, because masterbatch production technical, many of them are patent or proprietary technology, are generally pipe factory purchased from masterbatch manufacturer or dealer. The price of masterbatch is PE price adds 5000 yuan of the left and right side again commonly, for example PE14500 yuan/catty, masterbatch is about 19500 yuan/catty, the addition of masterbatch sees masterbatch in effective component, how many and performance are concerned, it is 30-45 or so commonly. Now suppose the raw material price of PE100 is 15,000 yuan/kg, the masterbatch is 20,000 yuan/kg, and the number of masterbatches added is 30. Then in 1000 kg of PE, 300 kg of masterbatch is added, and the total price is 15,000 +20000 30% = 21000 yuan. The total weight is 1300kg, which is equivalent to 16,153 yuan per ton, plus the processing fee of 2,000 yuan per ton (electricity fee). The cost of each ton of pipe is 18,153 yuan per ton. Not counting the production plant staff wages, equipment depreciation, marketing costs and other costs.At present, the sales price of some PE pipes is very low, lower than the price of the above raw materials and electricity, the only possibility is to use the low price of non-pe100 raw materials.The price of PVC is much lower than PE. For example, at present, PE is about 14,000 yuan per ton, while PVC is only about 6,500 yuan. Of course, PVC is still added with expensive stabilizers and toughening agents, but the overall price of raw materials is much lower than PE.

SPC floor main performance requirements

SPC floor main performance requirements1. Low shrinkage, warping and good toughness.2. Make sure that it is not easy to deform under various environments and has good locking tension and a certain peeling force between the substrate and the film. The performance mainly depends on the material type component processing technology equipment ability to decide.SPC processing requirements1. The stability of continuous production is very important because of the large extrusion volume of SPC floor production line and the need for online laminating.2. As the SPC floor is highly filled, the screw wears seriously and the screw value is relatively high, so the impact of the screw life on the total cost must be considered.3. The floor is relatively thin with small thickness tolerance requirements and fast extrusion speed, so it requires good material dispersion, plasticization performance and fluidity.

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;

PVC pipe drainage pipe advantages

1. Excellent surface hardness and tensile strength of pipes, high pipe safety coefficient.2. Good aging resistance, normal service life of more than 50 years.3. The pipeline has excellent corrosion resistance to inorganic acid, alkali and salt, and is suitable for industrial sewage discharge and transportation.4. Small friction coefficient of pipeline, smooth water flow, not easy to block, less maintenance work.5. The material has high oxygen index and self-extinguishing property.6. Pipeline small linear expansion coefficient of 0.07 mm / ℃, affected by the temperature deformation is small. The thermal conductivity and elastic modulus are small, and the freezing resistance is better than cast iron drainage pipes.7. The connection of pipes and fittings can be made by bonding, with simple construction method, convenient operation and high installation efficiency.8. With good water tightness: the installation of pvc-u pipe has good water tightness no matter it is connected by adhesive or rubber ring.

PVC Pipe Drain Pipe

1. Excellent surface hardness and tensile strength of pipes, high pipe safety coefficient.2. Good aging resistance, normal service life of more than 50 years.3. The pipeline has excellent corrosion resistance to inorganic acid, alkali and salt, and is suitable for industrial sewage discharge and transportation.4. Small friction coefficient of pipeline, smooth water flow, not easy to block, less maintenance work.5. The material has high oxygen index and self-extinguishing property.6. Pipeline small linear expansion coefficient of 0.07 mm / ℃, affected by the temperature deformation is small. The thermal conductivity and elastic modulus are small, and the freezing resistance is better than cast iron drainage pipes.7. The connection of pipes and fittings can be made by bonding, with simple construction method, convenient operation and high installation efficiency.8. With good water tightness: the installation of pvc-u pipe has good water tightness no matter it is connected by adhesive or rubber ring.

What are the ways to improve the heat resistance of PVC plastics?

1. PVC copolymerPVC(vinyl chloride) and other monomer copolymer resin composition if there are polar or large groups of components, the copolymer thermal deformation temperature increases accordingly, heat resistance is better than PVC, heat resistant products were made. PVC softening temperature is 78 ℃, and vinyl chloride vinylidene chloride and vinyl chloride copolymer of methyl methacrylate, vinyl chloride softening temperature of a propylene eyes were 100 ~ 130, 85, 140 ~ 150 ℃.2. Chlorination of PVCChlorinated polyvinyl chloride is made from PVC resin chlorinated, its chlorine content is 62%~68%. Chlorinated polyvinyl chloride (PVC) can be used continuously under 100 ℃ (higher than PVC 20 ~ 35 ℃), the highest temperature can reach 100 ~ 105 ℃. And the chemical stability, fire resistance, cold resistance are better than PVC. But the chlorination equipment antisepsis request is stricter. Resin is not easy to process and its application and development are restricted by its poor impact toughness.3. PVC cross-linkingCrosslinked PVC can be prepared by radiation crosslinking and chemical crosslinking. The crosslinked PVC products have higher mechanical strength, better dimensional stability, heat resistance, deformation, wear resistance and chemical resistance than ordinary PVC products. Radiation crosslinking wire can be continuous use under 100 ~ 110 ℃.4. PVC is blended with other polymersPVC is mixed with other polymers in a certain proportion, and the performance (full compatibility) of the blend is improved compared with PVC. Because of the compatibility of the two kinds of polymer mixing, can reach the molecular level of mutual melting, forming a single phase structure, so that the properties of the blend can be supplemented and strengthened, such as PVC/PS, PVC/PE, PVC/CPVC.5. Add heat-resistant modifierHeat resistant modifier is a kind of polymer with high heat resistance developed and produced in order to improve the heat resistance of PVC.6. Add inorganic filler to PVCAdding a certain amount of filler, can improve the heat resistance of PVC. Commonly used fillers are: heavy calcium carbonate, light calcium carbonate, precipitated calcium carbonate, calcined pottery, barium sulfate, red mud, titanium powder and so on.7. Add glass fiber into PVCAdding 20% ~ 30% glass fiber, PVC in without (or less) under the condition of plasticizer, its heat resistance can be increased to more than 100 ℃. Especially long fiber reinforced PVC, its thermal deformation temperature increased more significantly.

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.

PVC floor cleaning and maintenance knowledge collection

I. cleaning of PVC floor1.Dry mop: remove dust and dirt from the floor. Use dry or wet yarn, microfiber or other dry mops available.2.Vacuum cleaning: use a vacuum cleaner to remove dust and loose dirt from the floor. In restricted areas, this cleaning method can be used instead of a mop.3.Slightly wet mop: the mop should be slightly wet with water or detergent first. The method is to squeeze the excess water out of the mop with a dedicated cleaning winch. In addition, the mop can be sprayed with water or detergent. Be careful that there is no water gathering on the floor. The floor must be completely dry within 15-20 seconds of the end of the wipe.4.Remove the stain: spray the diluted neutral cleaner directly on the stain, then use white or red nylon cleaning pad to clean the stain until it is removed, and finally wipe clean with water.II. Maintenance of PVC floor1. Maintenance after floor laying is completed/before use(1) first remove the dust and sundries on the floor surface.(2) add 3M red sharpener or similar products to the floor cleaner at low speed for cleaning (dilute with strong general cleaner 1:20 into the water and add to the floor polisher), remove the protective wax, grease, dust and other dirt on the floor surface, and drain the sewage with a water absorber.(3) wash and dry with clean water.(4) apply 1-2 layers of high-strength facial wax as needed.2. Daily maintenance(1) pushing or vacuuming. (drag the dust agent on the ground to dry and push the dust.)(2) wet towing. (dilute the polish with a floor cleaner with 1:20 water and use a semi-wet mop to mop the floor.) If necessary, you can use the floor cleaner to cooperate with wash&shine at low speed.3. Regular cleaning and maintenance(1) pushing or vacuuming.(2) the floor cleaning glazing agent shall be diluted with 1:20 water, and the floor will be cleaned or polished with red abrasive disc added by high-speed polishing machine.(3) upper 1-2 layers of high-strength facial wax.(4) as required, it can cooperate with high-speed polishing machine to add white polishing pad for polishing processing.

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.