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Micro-cross-linked thermoplastic polyether ester elastomer and its preparing process

A thermoplastic polyether ester and elastomer technology, which is applied in the field of micro-crosslinked thermoplastic polyether ester elastomer and its preparation, can solve the problem of difficult to generate block copolymers, difficult to control the fluidity and product performance of polyether ester elastomer Unfavorable and other issues

Inactive Publication Date: 2004-02-04
上海中纺物产发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is not easy to control the fluidity of polyetherester elastomer after adding a small molecule crosslinking agent. The melt index of the product can only be changed within a small range, and the melting point of the product has decreased, which is not good for product performance.
[0004] In addition, in order to improve the solidification speed of polyether ester melt and shorten the molding cycle, polyethylene glycol or polytetrahydrofuran diol with higher molecular weight is often used as the soft segment, or polyoxypropylene diol is selected for low cost. As a soft segment, this often leads to phase separation during polymerization, making it difficult to generate block copolymers, resulting in poor elastic properties of the elastomer
At this time, adding a small molecule cross-linking agent can only slightly reduce the degree of phase separation, and cannot completely solve the problem.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] According to the prior art, 1018.2 parts of dimethyl terephthalate, 708.5 parts of 1,4-butanediol, 1407.1 parts of polyethylene glycol with a molecular weight of 2000, 5 parts of 1010 antioxidant, titanium 4.5 parts of tetrabutyl esters. Start stirring, the temperature of the kettle gradually rises to 160-220°C, the temperature of the fractionating column is set at 65°C, and methanol starts to distill out. When the amount of methanol distilled reaches 95% of the theoretical amount, the transesterification reaction can be considered complete. Gradually raise the temperature of the kettle to 240-280°C, and reduce the pressure in the kettle to below 1mmHg within 1 hour, and discharge the material when the stirring power reaches the maximum value. And the preparation method of the polyether ester elastomer of the embodiment of the present invention 1 is to add 140.7 parts of molecular weight to be the polyoxypropylene triol replacement part polyethylene glycol (accounting f...

Embodiment 2

[0033]According to the prior art, 1316.5 parts of dimethyl terephthalate, 916.1 parts of 1,4-butanediol, 1104.2 parts of polypropylene oxide diol with a molecular weight of 1000, 5 parts of antioxidant 1010, and 4.5 parts of titanic acid Tetrabutyl ester was added into a 10L polymerization kettle, and polymerized according to the steps in Example 1 above. Embodiment 2 of the present invention is to get 1024.7 parts of dimethyl terephthalate, 713.1 parts of 1,4-butanediol, 626.2 parts of molecular weight is 1000 polypropylene oxide glycol, 268.3 parts of molecular weight is 3000 polyepoxide Propane triol, 4 parts of antioxidant 1010, and 3.6 parts of tetrabutyl titanate were added to a 10L polymerization kettle, and polymerized according to the procedure in Example 1 above. Embodiment 2B of the present invention is to get 1276.5 parts of dimethyl terephthalate, 888.3 parts of 1,4-butanediol, 791.9 parts of molecular weight is the polypropylene oxide diol of 1000, 339.3 parts of...

Embodiment 3

[0037] According to the prior art, 1664.5 parts of dimethyl terephthalate, 1159.3 parts of 1,4-butanediol, 660.0 parts of polypropylene oxide diol with a molecular weight of 1000, 5.94 parts of trimethylolpropane, 5 parts of anti- Oxygen agent 1010 and 4.5 parts of tetrabutyl titanate were put into a 10L polymerization kettle, and the polymerization was carried out according to the above-mentioned steps of Example 1. And embodiment 3A of the present invention is to get 1660.3 parts of dimethyl terephthalates, 1155.4 parts of 1,4-butanediol, 533.3 parts of molecular weight is the polypropylene oxide diol of 1000, 133.3 parts of molecular weight is the polycyclic ring of 3000 Oxypropanetriol, 5 parts of antioxidant 1010, and 4.5 parts of tetrabutyl titanate were added to a 10L polymerization kettle, and polymerized according to the above-mentioned step 1 of Example 1.

[0038] Embodiment 3B of the present invention is to get 1666.0 parts of dimethyl terephthalate, 1159.3 parts o...

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PUM

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Abstract

A microcross-linked thermoplastic polyether ester elastomer contains the hard short-chain polyester segment consisting of dicarboxylic acid and biatonic alcohol and the soft polyether ester segment consisting of dicarboxylic acid and polyalkylenether diol. In the synthesizing procedure, the primary cross-linking agent (Xa(OH)n) and secondary one (X2(OH)m) are added. Its advantages are high overall performance, low hardness, high smelting point and short polymerizing time.

Description

technical field [0001] The invention relates to a polyether ester elastomer and a preparation method thereof, in particular to a slightly cross-linked thermoplastic polyether ester elastomer and a preparation method thereof. Background technique [0002] Linear thermoplastic polyether ester elastomer is obtained by copolymerization of dibasic carboxylic acid, glycol and polyalkylene ether glycol. As an engineering-grade elastomer, it has excellent physical and mechanical properties, such as toughness, fatigue resistance, high strength, wear resistance, oil resistance and chlorine resistance, so its usage has been increasing in recent years. [0003] The preparation of linear polyetherester elastomers is a well known technique. In order to obtain better overall performance, polyether ester is required to have a higher molecular weight. Usually, the method of prolonging the polycondensation time or adopting solid-state polycondensation is used. The former has a limited increa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G63/672C08G63/78
Inventor 刘森林李泽阳卢林放林继光时寅
Owner 上海中纺物产发展有限公司