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Method for raising crystallization rate of polyglycol terephthalate

A technology of poly(ethylene terephthalate) and diol phthalate, which is applied in the field of increasing the crystallization rate of polyester, can solve the problems of polyester molecular weight reduction and mechanical property degradation, and achieve the goal of increasing the crystallization rate and crystallinity Effect

Active Publication Date: 2010-01-06
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] CN1065857C discloses a non-chemical nucleating polyester nucleating agent, which does not chemically react with polyester when used, and can solve the problem of polyester molecular weight reduction and mechanical property decline caused by chemical nucleating agents. question

Method used

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  • Method for raising crystallization rate of polyglycol terephthalate

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0025] Take 50 grams of polyethylene terephthalate (PET), 0.5 grams of composition as Mg 6 Al 2 (OH) 16 (CO 3 )·4H 2 O, magnesium aluminum hydrotalcite with an average particle size of 0.6 to 0.8 microns, 0.1 g of antioxidant Irganox1010, added to the internal mixer, 260 ° C, 50 rpm and mixed for 5 minutes to form a uniform modified polyester A, Differential scanning calorimetry data are shown in Table 1.

example 2

[0027] Prepare modified polyester by the method for example 1, difference is in PET, the nucleating agent that adds is except described 0.5 gram magnesium aluminum hydrotalcites, adds 0.5 gram average molecular weight again and is the polyethylene glycol of 4000, through The modified polyester B was obtained after mixing in an internal mixer, and its differential thermal scanning calorimetry analysis data are shown in Table 1.

example 3

[0029] Prepare modified polyester by the method of example 1, difference is in PET, the nucleating agent that adds is except described 0.5 gram magnesium aluminum hydrotalcites, adds the sodium salt of 0.5 gram ethylene-methacrylic acid copolymer ( Trade name Surlyn8920), obtains modified polyester C after mixing in internal mixer, and its differential thermal scanning calorimetry data are shown in Table 1.

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Abstract

This invention discloses a method for increasing the crystallization rate of polydiol terephthalate. The method comprises: adding hydrotalcite as the nucleating agent into polydiol terephthalate, melting, mixing and cooling. The hydrotalcite is 0.1-5.0 wt. % of polydiol terephthalate. The method can also increase the crystallization degree of polyester.

Description

technical field [0001] The invention is a method for increasing the crystallization rate of polyester, specifically, a method for increasing the crystallization rate of poly(ethylene terephthalate) by adding a nucleating agent. Background technique [0002] The molecular chain of polyethylene terephthalate has rigid benzene rings and high symmetry. It is a crystalline polymer material with high melting temperature (Tm) and glass transition temperature (Tg). . Due to its excellent comprehensive properties, it is widely used in the fields of synthetic fibers, films and engineering plastics. However, due to the existence of rigid benzene rings in the molecular chain, the crystallization speed is slow, resulting in a long production time for its products, and it is easy to form larger-sized crystallites, which affects the transparency and mechanical properties of polyester products, limiting its application in engineering. Further applications in the field of plastics. In ord...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L67/03C08K3/34C08J3/12
Inventor 王立志刘伟孙春燕周涵代振宇任强
Owner CHINA PETROLEUM & CHEM CORP