What is polyester chip?

Polyester chips usually refer to polyester raw materials produced by polymerization, which are generally processed into flake particles of about 4*5*2 mm [1]. The production processes of polyester include direct esterification (PTA) and transesterification (DMT). PTA process has the advantages of low raw material consumption and short reaction time, and has become the main process and preferred technical route of polyester since 1980s. Large production lines are continuous production processes, and semi-continuous and intermittent production processes are suitable for small and medium-sized production devices. The uses of polyester now include fibers, various containers, packaging materials, films, films, engineering plastics and other fields.

Mainly used in bottle-grade polyester (widely used in the packaging of various drinks, especially carbonated drinks), polyester film (mainly used in packaging materials, films and adhesive tapes, etc. ) and polyester for chemical fiber. The earliest history of polyester series products can be said to be that Carothers of DuPont Company in the United States studied the polycondensation reaction of aliphatic dibasic acids and ethylene glycol at 1928, and made fibers from polyester at the earliest. 193 1 autumn, carothers officially published his research results in the American Chemical Society. Fiber has the luster of silk, and its strength and elasticity are equivalent to that of silk, but it has low melting point, easy hydrolysis, alkali resistance and no practical value. But this study proves for the first time that polyester can be made into fibers. Inspired by the work of Carothers, winfield and Dixon of Printing and Dyeing House Association (CPA) continued to study polyester in 194 1, and CPA obtained the patent right in 1942. It can be said that polyester (PET) was the earliest industrialized production in Britain in 1949. Because of its excellent wear resistance and high strength, it has become the largest variety of synthetic fibers.

1. According to the composition and structure, it can be divided into * * mixing, * * poly, crystallization, liquid crystal, cyclic polyester chips, etc.

According to the performance, it can be divided into: colored, flame retardant, antistatic, hygroscopic, anti-pilling, antibacterial, whitening, low melting point, tackified (high viscosity) polyester chips, etc.

According to the purpose, it can be divided into fiber grade polyester chips, bottle grade polyester chips and film grade polyester chips (mainly due to different process indexes). According to the different content of matting agent tio2, fiber-grade polyester chips can be divided into super bright (shiny), shiny, semi-dull and (full dull) polyester chips. And cationic polyester chips.