PVC / CPE Blend
DATE：2022/7/26 9:16:46 / READ： / SOURCE：This station
PVC / CPE Blend
Polyvinyl chloride / chlorinated polyethylene blends can also be called chlorinated polyethylene modified polyvinyl chloride, polyvinyl chloride andchlorinated polyethylene plastic alloy, abbreviated as pvc/cpe. (1) Properties of pvc/cpe blends pvc/cpe resin is a new type of polymer material. The compatibility of the two resins is related to the content of chlorine in CPE (the chlorine content of CPE is 36% - 48%) and the distribution of chlorine atoms on the main chain of ethylene. After adding chlorinated polyethylene to PVC resin, the processability of the blend was significantly improved compared with that of PVC resin, and the impact strength of the products was also improved, but the rigidity and tensile strength decreased slightly. When PVC and CPE are mixed at a mass ratio of 100:10, the bending strength is 56mpa, the tensile yield strength is 30MPa, and the elongation at break is 120%. Preparation method of pvc/cpe blend ① first design and improve the formula of pvc/cpe blend according to the requirements of the product ② measure various raw materials (PVC, CPE stabilizer, filler pigment and lubricant) according to the formula requirements. ③ Add PVC resin into the mixer for mixing, heat it up, and gradually add stabilizer in the mixing process. When the material temperature reaches 90 ℃, add filler, pigment and CPE. ④ when the material temperature reaches about 125 ℃, add lubricant and continue mixing to achieve uniform mixing of various materials. ⑤ Transfer the high-temperature mixture into the cold mixer to quickly cool the mixture to less than 50 ℃. ⑥ Put the low-temperature material into the extruder for mixing and plasticizing (the material temperature is about 170 ℃) to form pvc/cpe blends (3) pvc/cpe blend products and molding methods pvc/cpe blend molding products are mainly produced by extrusion. It is required that the length diameter ratio of the screw of the extruder is l/d=15=1, the compression ratio is 2:1, and the heating temperature of the extruder is 190~240 ℃. Extrusion molding impact resistant, weather resistant and fire-resistant hard products, including pipes, pipe fittings, plates, profiled materials, wires and cables, hoses, films, transportation belts, etc.2.3.18 PVC / vinyl acetate copolymer blend
PVC / ethylene vinyl acetate copolymer blend can also be called EVA modified PVC, abbreviated as pvc/eva. It is a polymer material made of polyvinyl chloride, ethylene vinyl acetate copolymer and other auxiliary materials by mixing and granulating evenly in a certain proportion. (1) Properties of pvc/eva blends the compatibility between PVC and EVA depends on the content of VA in EVA. When the content of VA is 65% - 70%, EVA is completely compatible with PVC. When 45% VA in EVA is mixed with PVC to form a network multiphase structure, it can improve the impact resistance of PVC, processing performance and thermal stability. The blended resin products have good low-temperature impact resistance, cold resistance, processability, chemical resistance and hand feel. (2) Preparation method of pvc/eva blend ① measure PVC and EVA (the content of vinyl acetate in EVA is required to be about 50%, and the relative molecular weight is 100000, which is powder) and some other materials (stabilizer, filling lubricant, etc.) according to the requirements of the mixed formula. Note that the addition of EVA should not be less than 15%.② Put all kinds of materials with accurate measurement into the mixer, stir and mix evenly, ③ mix and plasticize the raw materials evenly on the double roll open mill, and then slice and roll them up ④ cut the slices into uniform pellets with a pelletizer, that is, pvc/eva blends (3) pvc/eva blends products and molding methods pvc/eva blends store type plastic products, which can be extruded, injection molded and calendered. The production products include impact resistant pipes, pipe fittings, plates, sheets, profiled materials and parts in industrial equipment. Soft products include cold resistant films, films, insulating protective layers for wires and cables, artificial leather and foam soles. Pvc/eva blends are produced by Shanghai chemical plant, Tianjin modern chemical plant, Beijing organic chemical plant and other units in China
2.3.19 PVC / acrylonitrile butadiene styrene terpolymer blend
PVC / acrylonitrile butadiene styrene terpolymer blend can also be called ABS modified PVC. In fact, this blend is mainly PVC and ABS resin alloy. A plastic alloy made by blending processing, which can be abbreviated as pvc/abs plastic (1) pvc/abs plastic alloy performance pvc/abs plastic alloy is a blend material with the advantages of PVC and ABS resins. Its products are flame-retardant, self extinguishing when leaving the fire source, resistant to chemicals, have excellent mechanical properties at room temperature, heat-resistant, impact resistant, and easy to process; The surface gloss, dyeability and appearance decoration of the products are better than those of the seed materials, and the weather resistance is not as good as that of PVC products. The original PVC products, but pvc/abs products should not be used outdoors, because this pvc/abs plastic alloy is a product with multiple colors, and the appearance can be self-contained particles. Color, light yellow, ivory, black or other colors, without mechanical impurities, with uniform surface. ① According to the requirements of the application conditions of pvc/abs plastic alloy molded products, the composite formula of pvc/abs blends was designed. ② Various raw materials (PVC, 5%~15% ABS, stabilizer, modifier and other additives) are measured according to the material ratio requirements in the blend formula. ③ Use a high-speed mixer to stir and mix all kinds of metered materials evenly. ④ Mix and plasticize evenly with an open mixer or extruder, and then cut out uniform granular materials. (3) Pvc/abs plastic alloy products and molding methods pvc/abs plastic alloy products can be molded by extrusion, calendering and injection molding. Such blends are mostly used to form rigid plastic products with flame retardancy and good impact resistance. Such as extruded pipes, sheets and insulating sleeves for wires and cables. Injection molded TV shell, telephone shell, electronic computer shell and various instrument shells, automobile components, connectors in circuits, warp and weft tubes in textile machinery, etc. The selection of extrusion molding equipment should refer to the extrusion molding process conditions of ABS resin: the length diameter ratio of screw is (18~20): 1, the compression ratio is (2.5~3): 1, the heating temperature of barrel is 160~185 ℃, and the mold temperature is 165~195 ℃. The process temperature of the machine simplification homogenization section in the injection molding equipment is 165~185 ℃, the temperature of the front end of the barrel is 170~180 ℃, the temperature of the nozzle is 175-190 ℃, and the injection pressure is about 50MPa. After the production of pvc/abs plastic alloy extruded or injection molded products is completed, ABS, HDPE and hips top clean the residues in the machine Jane to prevent the co evolution time in the machine Jane from being decomposed by heating. Pvc/abs plastic alloy resin production units include Shanghai Gaoqiao Chemical Plant, lanchengxue Industrial Company synthetic rubber plant, Shanghai Shengde plastic plant, etc.
2.3.20 PVC / polyacrylate blends
PVC / polyacrylate blends can also be called ACR rubber modified polyoxyethylene. It is a kind of high molecular material made by mixing polyvinyl chloride and polyacrylate in a certain proportion, abbreviated as pvc/acr (1) pvc/acr blend performance polyvinyl chloride and polyacrylate are well compatible. Due to the mixing of polyacrylate in polyvinyl chloride resin, the impact resistance of polyvinyl chloride smoke products is improved, and the processing performance, weather resistance, transparency, light resistance, growth rate, cold resistance and coloring are improved. In addition, It also improves the melt strength, gel speed and stretching parts, and then adds auxiliary materials for PVC molding. After mixing evenly and mixing, it can be granulated and become a blend. (3) Pvc/acr blend products and molding methods pvc/acr blend molding plastic products can be processed and molded by extrusion, injection molding, foaming and other methods. It is mainly used for molding products with high impact strength requirements, such as pipes, plates, profiles, sheets, hollow products and foaming products.
2.3.21 red mud filled PVC
Red mud filled PVC can also be called red mud plastic. It is a new composite material made of PVC and red mud mixed in a certain proportion, plus some other PVC molding additives. (1) PVC filled with red mud is a material composed of red mud and PVC resin. In addition to the properties of ordinary PVC resin, it also has good heat resistance, mechanical properties and aging resistance. This kind of composite material has low production cost and low toxicity. However, the relative density of red mud is large (2.7~2.9), and its color is earthy red, which is not suitable for light and light products. See table 2-91 for the technical standards of PVC rigid plastic pipes filled with red mud. Table 2-91 technical standard for plastic rigid pipes formed with red mud filled PVC (sg78-75) performance index relative density 1.40~1.60 flat (pressed to 1/2 of the outer diameter) no cracks and cracks hydraulic pressure (60 ± 2) ℃ allowable stress 13Mpa or (20 ± 2) ℃ allowable stress 35MPa for 1H no cracks, no leakage size change rate /% along the length direction along the diameter direction does not exceed ± 4.0 does not exceed ± 2.5 (2) the preparation method of red mud filled PVC plastic is according to the formula requirements, After measuring PVC, red mud (aluminum refinery residue) and other additives, they are evenly mixed in a high-speed mixer, and then mixed with an extruder, plasticized and granulated to form a composite. (3) Mud filled PVC products and forming methods red mud filled polychlorinated beta products can be processed and formed by extrusion, calendering and pressing. Molded products: main pipes, plates, floor tiles and other hard plastic products; It can also be used to make soft products such as shoe materials, artificial and repackaging films. The production units of red mud filled PVC include Zhengzhou No. 3 plastic factory, Henan Anyang Zhi factory, Chengdu No. 6 plastic factory, Guiyang No. 2 plastic factory, Weihai No. 1 plastic factory and Yingkou plastic factory. The production process sequence of PVC products filled with red mud in these plastic factories is as follows. ① The process sequence of producing plastic products with extruder is: PVC resin - red mud - metering → mixing → mixing → granulation → extrusion → other auxiliary materials of products - ② the process sequence of producing plastic sheets with calender is: PVC resin - red mud - metering → mixing → mixing → calendering → sheet → pressing plate and other transportation AIDS
2.3.22 fly ash filled PVC
Polyvinyl chloride filled with fly ash can also be called filled polyvinyl chloride, which is a composite material composed of polyethylene chloride smoke and fly ash. In addition to the properties of PVC, the addition of fly ash improves the corrosion resistance, moisture resistance and flame retardancy of PVC resin, and reduces the production cost of products.The preparation method of fly ash filled PVC is the same as the red mud filled PVC method introduced above. As long as the fly ash (the waste residue fly ash discharged from the thermal power plant is treated with coupling agent), PVC (xj-4 type) and other additives are mixed evenly according to the formula, the products can be formed by extrusion or calendering method, which can fully refer to the process in 2320 of this book. The formed products include floor, wall coaming, ceiling, dado decorative board Performance index of PVC molding plates filled with fly ash for corrosion prevention and Kang production units of fly ash filled PVC include Zhengzhou plastic board factory, Jiangsu Thorpe Chemical Co., Ltd. and Liaoyuan calcium plastic material factory.
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