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Thermoplastic Introduction Of Chemical Sheet
- Oct 18, 2017 -

Can be re-heating softening, cooling and curing a large class of synthetic resin (also includes the common natural resin). These resins are high molecular weight solids at room temperature, are linear or with a small amount of branched polymer, without cross-linking between molecules, only by virtue of van der Waals force or hydrogen bond to attract each other. In the molding process, the resin by the pressurized heating that is softening and flow, no chemical cross-linking, can be shaped in the mold, the cooling stereotypes, the desired shape of the product. In the repeated heating process, the molecular structure is basically no change, when the temperature is too high, too long, it will occur degradation or decomposition. These are different from thermosetting resins.Chemical Sheet

Thermoplastic resin to petrochemical products as the main raw material, large output. Accounting for about 90% of the world's total synthetic resin production. Commonly used thermoplastic resins are: polyethylene, polypropylene, polyvinyl chloride, polystyrene, polymethyl methacrylate, polyester, polyoxymethylene, polyamide, polyphenylene ether and so on. Thermoplastic resin according to the aggregation structure can be divided into crystalline (such as polyamide) and amorphous (such as polymethyl methacrylate) two categories. Crystalline resin due to grain refraction, product transparency is poor, high melting point, molding shrinkage. Some of the varieties of amorphous resin in the transparency of the plate can be comparable with the inorganic glass, processing shrinkage is also small.Chemical Sheet

In the thermoplastic resin by adding a variety of plastic additives, such as antioxidants, plasticizers, and a variety of reinforcing materials, can be made of thermoplastic. Some varieties (such as polyester, polyamide) additives add very little, pure resin can be directly processed; some varieties (such as polyvinyl chloride) formula is extremely complex, different formulations, different performance. Thermoplastics commonly used processing methods are extrusion, blow molding and injection molding.Chemical Sheet

Production of thermoplastic resin polymerization process, the macromolecule chain for the carbon chain are generally used to produce polymerization reaction, macromolecular chain for the chain with the polycondensation reaction system. Thermoplastic resins are mainly used as thermoplastics and are also used as adhesives and paints. Most synthetic resins are thermoplastic resins.Chemical Sheet