Application of PVC in hollow board production line
DATE：2021/5/4 9:09:28 / READ： / SOURCE：This station
Application of PVC in hollow board production line
The melting point of PVC is 215c0, while the pure PVC resin begins to decompose at 1, 150~ It can be seen that PVC can not be processed by hot melting without any additives. In order to improve the thermal stability of PVC and prevent decomposition at processing temperature, PVC resin must be processed by adding heat stabilizer;
② PVC products can be divided into soft, semi hard and hard according to the content of plasticizer in the formula. In the formula of soft products, the plasticizing dosage is more than 40 phr, the semi-rigid dosage is 10 ~ 40 phr, and the hard dosage is less than 10 phr, which is based on the weight of 100 phr resin;
③ PVC is a typical amorphous polymer. The glass transition temperature of PVC varies with the molecular weight of PVC
It has good self extinguishing performance between 75c and 75c, and produces strong black smoke when burning in the fire, and has the special smell of HCI, which is self extinguishing when leaving the fire;
④ PVC has good transparency. The mechanical strength varies with the formulation. Excellent chemical resistance, room temperature resistance
Any concentration of hydrochloric acid, less than 90% sulfuric acid, 50% ~ 60% nitric acid and less than 20% caustic soda. Excellent oil resistance, resistant to various alcohols; Ov9 welcome and eject cake ov9 with drunk pump in 100 gas main business gongshengdan 00 Yingchu 02 County female Ganke 5. PVC can dissolve or swell in ether, chlorinated aliphatic hydrocarbon, aromatic hydrocarbon and ketone; It is heat sensitive and light sensitive. It is heat sensitive plastic. Therefore, the temperature is not more than 80C. Adding antioxidants can improve the anti-aging properties of the products. After aging, the PVC products are hard, brittle and yellowed. The impact strength of rigid PVC products is not high. Therefore, in many applications, the impact modifier should be added to the formula, such as: CPE, ACR, MBS, ABS and so on, adding 3 ~ 5 phr of impact modifier is not only conducive to processing, but also can increase the impact strength by 3 ~ 5 times; PVC used in food and drug packaging should be non-toxic, VCM content should be less than 1nl / L, stabilizer and plasticizer should be non-toxic; Hollow board production line www.handern.com
PVC is widely used in plastic packaging. Film has been used in chemical fertilizer, grain packaging, and fresh meat packaging. Shrinkage film and winding film are commonly used in PVC production. In addition, PVC is also used in the production of plastic bottles, cans, barrels, thermoforming cups, plates, dishes and various snacks packaging. In addition, the film is also used for adhesive tape base, plastic turnover box, corrugated box, seedling tray, cooling tower water film and so on. PVC decoration materials and building materials are widely used in many fields Department. PVC is the main coating material of wire and cable. Hollow board production line www.handern.com
Polypropylene (PP) was first industrialized in Italy in 1957. It can be divided into homopolymer and copolymer. Copolypropylene was modified to improve the cold resistance of homopolymer, and the impact strength decreased rapidly below 0C. For example, copolypropylene with 5% ~ 7% ethylene can make the cold resistance of polypropylene reach 10%~ - 150, which is cold resistant polypropylene. Polypropylene (PP) is characterized by the presence of Ch in its molecule, There are three kinds of different positions- CH, which is regularly arranged in one direction of the molecular chain segment, is called isotactic polypropylene. Because of the good regularity of the molecules, isotactic polypropylene has the maximum crystallinity, high physical and mechanical properties, and the maximum crystallinity can reach 90%; One CH3 Syndiotactic polypropylene, which is regularly distributed on the two sides of the long chain of PP, is called syndiotactic polypropylene; - - CH3 Randomly arranged on the side of the long chain is random polypropylene. Random polypropylene is produced by petrochemical plants. It is a by-product of PP and contains a large amount of water. Before use, a large amount of water in app should be squeezed out under the condition of water cooling on the two roll rubber mixer, and then added with various additives, and then used after two roll drawing granulation. It is the raw material of Color Masterbatch, hot melt adhesive and impact modifier of certain resin. Hollow board production line www.handern.com
PP is one of the lightest thermoplastics after poly (4-methylpentene-1). Same as PE- The samples are colorless, tasteless and nontoxic solid particles; It has excellent mechanical strength, high rigidity and hardness, good bending fatigue resistance and good heat deformation resistance. Hollow board production line www.handern.com
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