Explanation of the noun of polyester 20, explanation of the noun of polyester

A general term for polymer compounds formed by the condensation of diols or polyols and diacids or polyacids. Including polyester resin, polyester fiber, polyester acid glue, etc.

For example, polyethylene terephthalate (PET) is a polymer compound. Polyethylene terephthalate (PET) is produced by polycondensation of terephthalic acid (PTA) and ethylene glycol (EG), part of which is finally generated by underwater pelletizing.

Fiber-grade polyester chips are used to manufacture polyester staple fiber and polyester filament, which is the raw material for polyester fiber enterprises to process fibers and related products, polyester as the largest variety of chemical fiber, occupying nearly 80% of the market share of the chemical fiber industry, so the market changes and development trends of polyester series are the focus of attention of the chemical fiber industry.

At the same time, polyester also has bottles, films and other uses, which are widely used in the packaging industry, electronic appliances, medical and health, construction, automobiles and other fields, among which packaging is the largest non-fiber application market for polyester, and it is also the fastest growing field of PET. It can be said that polyester chips are an important intermediate product connecting petrochemical products and products from multiple industries.

In recent years, with the rapid development of China's economy, the apparent consumption of polyester chips in China has grown rapidly. China's polyester production capacity is developing rapidly. In 2004, the fluctuation of the world's oil market triggered changes in the international raw material market, and the development of China's polyester raw material industry seriously lagged behind the downstream industry, and the dependence of the domestic polyester raw material market on imports was very high.

At the same time throughout the year, the petrochemical industry downstream conduction tends to weaken, so that the efficiency of the polyester industry has declined sharply, polyester fiber is close to the edge of loss, and the polyester industry has entered a downturn in the industry reshuffle. Under this market situation, production enterprises especially need macro and micro analysis of the industry, and need to conduct research and investigation on international and domestic production, sales, market competition, market structure, international and other aspects to formulate corresponding strategies and development plans.

Thermosetting resin: After the resin is heated, it produces chemical changes, gradually hardens and molds, and does not soften or dissolve when heated. The molecular structure of thermosetting resin is body type, it includes most of the condensation resin, and the advantage of thermosetting resin is high heat resistance and is not easy to deform under pressure.

The disadvantage is that the mechanical properties are poor. Thermosetting resins include phenolic, epoxy, amino, unsaturated skin and polyester, as well as silicone ether resins. Thermoplastic resins:

It has the properties of softening by heat and hardening by cooling, and it does not react chemically, so it can maintain this performance no matter how many times the heating and cooling are repeated. All thermoplastic resins have a linear molecular structure. It consists of a fully polymerized nucleus resin and a partially condensed resin.

Thermoplastic resins are: PE-polyethylene.

PVC - Polyvinyl chloride.

PS-polystyrene, PA-polyamide.

POM-polyoxymethylene, PC-polycarbonate.

Polyphenylene ether, polysulfone, rubber, etc. The advantages of thermoplastic resins are that they are easy to process and mold, and have high mechanical energy. The disadvantage is poor heat resistance and rigidity. Elastomers that are rubber-elastic at room temperature and can flow when heated are called thermoplastic elastomers.