1, polyester properties: the general term for polymers obtained by polycondensation of polyols and polyacids.

2. Properties of resin: it has softening or melting range after heating, and it tends to flow under the action of external force when softening. It is a solid, semi-solid and sometimes liquid organic polymer at room temperature.

Second, the characteristics are different.

1, polyester features: Polyethylene terephthalate (PET) is produced by polycondensation of terephthalic acid (PTA) and ethylene glycol (EG), and part of PET is finally produced by underwater granulation. Fiber-grade polyester chips are used to produce polyester staple fibers and polyester filaments, and are raw materials for processing fibers and related products in polyester fiber enterprises.

2. Characteristics of resin: the relative molecular weight is uncertain but usually high, and it is solid, medium solid, pseudo-solid and sometimes liquid organic at room temperature. It has a softening or melting temperature range, tends to flow under the action of external force, and often cracks into a shell.

Extended data:

Polyester is a highly polar polymer, and generally uses internal and external lubricants with relatively large molecular weight. Commonly used are stearic acid, stearyl alcohol, montanic acid and its derivatives (soap, ester), glyceryl trihydroxystearate, ethylene bis stearylamine, etc.

In terms of product varieties, China's polyester production is still dominated by fiber polyester, accounting for 88% of the total annual production capacity; The annual production capacity of domestic non-fiber polyester chips is about 6.5438+0 million tons, among which the development of polyester bottle chips is particularly rapid, with an annual production capacity of more than 500,000 tons in 2002 alone. However, due to the limited domestic market capacity, the operating rate of polyester bottle chip device is less than 50%.

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