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Synthesis method of polyester chip for low extraction membrane

A synthetic method and technology of polyester chips, applied in the field of polyester preparation, to achieve low cost of use, reduce the amount of addition, and overcome the effects of easy moisture absorption

Pending Publication Date: 2021-10-01
常州浩阳新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the polycondensation temperature is the same as the degradation temperature during the PET synthesis process (both 280-290°C), in fact the reaction in the polycondensation reactor is always reversible. It is also continuously degraded into low-molecular-weight s

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0028] A method of synthesizing a low extraction film of polyester chips, the synthetic method comprising the steps of:

[0029] 1) the esterification reaction: 100 parts of terephthalic acid, 110-130 parts of ethylene glycol, after thorough mixing 0.1-0.2 parts cobalt acetate was transferred to a reaction vessel and heated to 210-230 deg.] C under a nitrogen atmosphere, in 1.2 1.6kg / cm 2 Constant stirring at a pressure esterification reaction, the esterification reaction time is controlled to 3-5h, the esterification reaction time in the present invention is controlled to 3-5h, because the reaction time is more than 5 hours, will lead to a large increase in side reactions, If the reaction time is less than 3 hours, the water can not be generated in the autoclave was distilled off in time, increase side reactions, side reactions will lead to increase the melting point of PET decreased, affecting the appearance of the formed product; parts proportion of terephthalic acid and ethy...

Example Embodiment

[0033] Example 1

[0034] A method of synthesizing a low extraction film of polyester chips, the synthetic method comprising the steps of:

[0035] 1) the esterification reaction: 100 parts of terephthalic acid, 110 parts of ethylene glycol, 0.1 parts of the mixed cobalt acetate was transferred to a reaction kettle heated to 210-230 deg.] C under a nitrogen atmosphere, at 1.2-1.6kg / cm 2 Constant stirring at a pressure esterification reaction, the esterification reaction time is controlled to 3-5h,

[0036]2) Pre-reduced polymerization: When the amount of water produced by the reaction is higher than 98% of the amount of water reflected in the theory of terephthalic acid and the ethanol, add 0.01 part of the antioxidant 618, 10-20 third monomers. 0.02 parts 25% KF / Al 2 O 3 The compound of the nano-trioxide was transferred to the polycondensation, and the pre-concentrated polymerization temperature was 245 to 265 ° C, and the vacuum degree to the vacuum to the pressure of 1100-1...

Example Embodiment

[0042] Example 2

[0043] Synthesis of a polyester slice for a low extraction membrane, the synthesis method comprising the steps of:

[0044] 1) Esterified reaction: 100 parts of terephthalic acid, 110 parts of ethylene glycol, 0.15 parts of cobalt acetate is thoroughly mixed into the reaction kettle, raised to 210-230 ° C under a nitrogen atmosphere, at 1.2-1.6kg / cm 2 The constitutive stirring under pressure is esterified, and the esterification reaction time is controlled to 3-5 h.

[0045] 2) Pre-reduction polymerization: When the amount of water produced by the reaction is higher than 98% of the amount of water that is completely reflected in terephthalic acid and ethylene glycol theory, add 0.011 antioxidants 618, 15 parts of the third monomer, 0.05 parts. 25% kf / al 2 O 3 The compound of the nano-trioxide was transferred to the polycondensation, and the pre-concentrated polymerization temperature was 245 to 265 ° C, and the vacuum degree to the vacuum to the pressure of ...

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PUM

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Abstract

The invention relates to a synthetic method of a polyester chip for a low extraction membrane, which belongs to the technical field of polyester preparation, and comprises the following steps: 1) carrying out esterification reaction, 2) carrying out pre-polycondensation reaction; 3) carrying out final polycondensation reaction; (4) melting and kneading the PET original sheet obtained in the step (3) with phosphate, crown ether and a bisphenol alkene oxide at the melting temperature of 280 DEG C for 5 minutes; According to the invention, 25% KF/Al2O3 and nano antimony trioxide are adopted as a compounded catalyst, the addition amount of antimony trioxide can be reduced, and introduction of impurities is reduced. Compared with ethylene glycol antimony, antimony trioxide is added, due to the fact that monovalent and subsequent water removal is not needed, and the use cost is lower, so that the defects that ethylene glycol antimony is extremely prone to absorbing moisture, and after the package is unsealed, the package must be completely used up for one time can be overcome. In addition, during the pre-polycondensation stage, reaction materials are low in concentration and small in molecular chain, so that the vacuum degree is increased at a constant speed in the pre-polycondensation stage, and flooding caused by the fact that a large number of materials are brought out can be avoided.

Description

technical field [0001] The invention relates to a method for synthesizing polyester slices for low-extraction films, and belongs to the technical field of polyester preparation. Background technique [0002] PET (polyethylene terephthalate) is a milky white or light yellow, highly crystalline polymer with a smooth and shiny surface. It has excellent physical and mechanical properties in a wide temperature range. The long-term use temperature can reach 120 ° C. It has excellent electrical insulation. Even at high temperature and high frequency, its electrical properties are still good, but its corona resistance is poor. Creep resistance, fatigue resistance, friction resistance and dimensional stability are all very good. [0003] Due to its good performance, PET materials are widely used in engineering plastics, films, bottle flakes, especially fiber fields, but now PET materials will produce oligomers as by-products in production. It will affect the subsequent fiber produc...

Claims

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Application Information

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IPC IPC(8): C08G63/189C08G63/183C08G63/78C08G63/83C08G63/84C08G63/86C08L67/02C08K5/521C08K5/15
CPCC08G63/189C08G63/183C08G63/866C08G63/84C08G63/83C08G63/78C08K5/521C08K5/15C08L67/02
Inventor 段旻刘勤学姚孝平孔云飞马强杨彩怡
Owner 常州浩阳新材料科技有限公司
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