Easy-to-alkaline-hydrolysis poly ester and preparation method

A technology of polyester and alkali hydrolysis, applied in the field of polyester chemical industry, can solve the problems of difficulty in obtaining polymers with sufficient polymerization degree, inability to meet the requirements of composite fibers, easy alkali hydrolysis of polyester, poor heat resistance, etc.

Inactive Publication Date: 2003-08-27
济南正昊化纤新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If too much polyethylene glycol is added, the polymer contains serious bubbles, and the heat resistance is poor, and the viscosity drops during melt spinning. It is easy to add 5-sulfonate-isophthalic acid components below 3.0 mol%. The alkaline hydrolysis of alkali hydrolyzed polyester is slow, such as adding more 5-sulfonate-isophthalic acid components, because the 5-sulfonate-isophthalic acid components are charged and cause aggregation and polymerization The viscosity of the compound increases quickly, and it is difficult to obtain a polymer with a sufficient degree of polymerization, which cannot meet the requirements of the composite fiber for the easily alkali-degradable polyester

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Embodiment 1. easy alkali hydrolysis polyester

[0030] The main repeating unit ethylene terephthalate is composed of purified terephthalic acid (PTA) and ethylene glycol (EG), and contains 6 mol% of isophthalic acid (IPA) in the acid component, and purified terephthalic acid 7% sodium sulfonate-isophthalate (SIPE) based on the total molar weight of dicarboxylic acid and isophthalic acid, containing 9% by weight of polyethylene glycol with an average molecular weight of 4000 in the polymer (PEG) and contains a composite heat stabilizer as follows:

[0031] A) tetrakis [β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionic acid] pentaerythritol ester (oxidant inhibitor 1010), the addition is 0.03% of polyester weight,

[0032] B) cobalt acetate, add-on is 0.02% of polyester weight,

[0033] C) trimethyl phosphate, the addition amount is 0.02% of polyester weight.

Embodiment 2

[0034] Embodiment 2. easy alkali hydrolysis polyester preparation method

[0035] Put 1000kg of purified terephthalic acid (PTA), 60kg (5.67% moles) of isophthalic acid (IPA), 500kg of ethylene glycol (EG), and 0.32kg of polymerization catalyst antimony trioxide into the beating tank for beating, and then continue to Enter the esterification tank, esterify under normal pressure at a temperature of 250--260 ° C, and end the esterification with 220 kg of water, move it into the polymerization tank, and add 140 kg (6% mole) of 5-sodium sulfonate-ethylene glycol isophthalate (SIPE), stirred for 30 minutes, the polyethylene glycol (PEG) that the average molecular weight that adds 120kg (9% of polyester amount) is 4000 and adds antioxidant 1010: 0.4kg (0.03%), cobalt acetate 0.2kg ( 0.015%), trimethyl phosphate 0.2kg (0.015%), stirred for 30 minutes, pre-condensed in low vacuum, temperature 240--270°C, and easily polymerized in high vacuum (less than 100Pa), temperature 276--280°C ...

Embodiment 3

[0046] Embodiment 3. Easy alkali hydrolysis polyester

[0047] The main repeating unit ethylene terephthalate is composed of purified terephthalic acid (PTA) and ethylene glycol (EG), and contains 7.5 mol% of isophthalic acid (IPA) in the acid component, and purified terephthalic acid 9% sodium sulfonate-isophthalate (SIPE) based on the total molar weight of dicarboxylic and isophthalic acids, containing 11% by weight polyethylene glycol with an average molecular weight of 4500 in the polymer (PEG) and contains a composite heat stabilizer as follows:

[0048] A) 2,2-thiobis(4-methyl-6-tert-butylphenol) (antioxidant 2246), the addition is 0.04% of polyester weight,

[0049] B) cobalt acetate, add-on is 0.02% of polyester weight,

[0050] C) phosphoric acid, the addition amount is 0.015% of polyester weight.

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PUM

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Abstract

The invention refers to a method of preparing easy-alkaline hydrolysis polyester. The main repeated unit is diglycol terephthalate, the acid containing 5-sodium sulfonate-diglycol isophthalate (SIPE), 5-10 mol% and isophthalic acid (IPA), 4-8 mol%, the polymer containing polyethylene glycol (PEG), molecular weight 1000-8000, weight %: 6-12, and compound heat stabilizing agent composed of antioxygen, cobalt acetate, phosphoric acid and phosphorous acid or its esters.

Description

(1) Technical field [0001] The present invention relates to a kind of easily alkali decomposing polyester and its preparation method, especially a kind of preparation method of easily alkali decomposing polyester which has sufficient alkali water solubility, low viscosity drop during melt spinning and excellent spinning operability. Polyester chemical technology field. (2) Background technology [0002] One of the most important developments in the field of chemical fibers is the birth of island-in-sea composite fibers. The method of preparing ultrafine fibers by dissolving the sea components in island-in-sea fibers and the development of corresponding artificial leather have established new uses for ultrafine fibers and set off a new era of composite fibers. A new upsurge in development. The easily alkali-degradable polyester is used as a component of the composite fiber (the cross-sectional shape is island-in-the-sea, mixed, segmented, etc.), and the easily alkali-degrada...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/03
Inventor 孙寒松王国德王红王永奇边树昌
Owner 济南正昊化纤新材料有限公司
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