A kind of polyester amide elastomer and preparation method thereof

Abstract

The invention discloses a preparation method of a polyesteramide elastomer. The preparation method comprises the following steps: (1) carrying out decompression and pumping vacuum after enablinga first monomer, a catalyst a and a capping agentto react, so asto obtain an intermediate product A; (2) enablingthe intermediate product A to be esterified with monohydric alcohol, and carrying out decompression, so as to obtain an intermediate product B of which the end group is an ester group; (3) carrying out transesterification on the intermediate product B, a second monomer, dihydric alcohol and a catalyst b to obtain an intermediate product C of which the end group is a hydroxy group; (4) carrying out polycondensation on the obtained intermediate product C and polyether diolto obtain the polyesteramide elastomer, wherein the polyether diol is blocked by hydroxylends, and dihydric alcohol is aliphatic diols of C2-C10. The polyesteramide elastomer disclosed by the invention is simple and controllable in process route, loose in reaction conditions and fewerin side reactions, and combines the advantages of the polyesteramide elastomer and a polyester elastomer, thereby being better in performance.

Description

technical field [0001] The invention relates to the fields of polyamide elastomer and polyester elastomer, in particular to a preparation method of polyester amide elastomer. Background technique [0002] Polyamide thermoplastic elastomer is a kind of thermoplastic elastomer with excellent performance and wide application. Its molecular chain is composed of hard segment composed of polyamide and soft segment composed of polyether. The molecular weight of each segment generally does not exceed 4000. A molecular chain is generally larger than a triblock. The polyamide thermoplastic elastomer has the advantages of nylon, and many patents disclose the synthesis method of the copolymer with polyamide block and polyether block. [0003] The existing preparation method of polyester amide elastomer is generally to first synthesize the polyamide block with active end groups, and then react with end group polyether to synthesize. The reaction mechanism is the esterification reaction...

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Problems solved by technology

The reaction conditions need to be reacted under high temperature and high vacuum conditions to synthesize high molecular weight polymers, and because the conditions are relatively harsh, it is necessary to ensure that the molar ratio of the end groups of the polyamide block and the polyether block is equal, and there is a slight deviation. The molecular weight will not meet the demand, but in the reaction of preparing polyamide block, there is a certain molecular weight distribution of the synthesized polyamide prepolymer, and the molecular weight of the polyether also has a certain molecular weight distribution, so that the polyamide prepolymer It is difficult to control the molar ratio between the terminal carboxyl group and the terminal hydroxyl group of polyether to be 1:1 by metering, resulting in incomplete polymerization in the polycondensation reaction stage, low polymer molecular weight, and poor physical and mechanical properties

Moreover, under high temperature conditions, carboxyl groups are prone to decarboxylation and side reactions occur, and there will be many side reactions when synthesizing polyamide blocks, which brings great difficulties to the proportioning

[0004] Existing nylon elastomers are usually ring-opened with laurylamide abroad, and then produced with polyether, because lauryl lactam ring-opens quickly, and the ring-opening is relatively complete, with few by-products, so it is easy to control the content of end groups; But laurylamide has not been produced in China so far, it needs to be imported, and the price is high

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