A kind of preparation method of polyurethane elastomer containing stereocomplex crystal

A technology of polyurethane elastomer and stereocomplex crystallization, which is applied in the field of polyurethane elastomer, can solve problems such as difficulty in realization, and achieve the effects of low pollution, high melting point, and resource saving
CN106496490BActive Publication Date: 2019-02-01ZHEJIANG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
ZHEJIANG UNIV
Publication Date
2019-02-01

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Abstract

The present invention relates to a polyurethane elastomer technique and is intended to provide a preparation method of polyurethane elastomer containing stereoregular complex crystal. The preparation method includes steps of dissolving PLLA-PEB-PLLA and PDLA-PEB-PDLA in toluene and cooling to obtain prepolymer solution; injecting toluene solution containing catalyst and chain extender (or crosslinking agent) into prepolymer solution for uniformly stirring, after the reaction, heating the solution in a vacuum oven, drying to be constant weight, and then obtaining the polyurethane elastomer containing the stereoregular crystal. The hardness of the elastomer can be crystallized, the melting point is high, and the mechanical strength and the modulus are high. By changing the mixing ratio of the two components, the content of the stereoregular complex crystal can be adjusted to facilitate the regulation of the mechanical strength, modulus and heat resistance; the hard segments of the elastomer are bio-based and biodegradable PLLA and PDLA, which are environment friendly, green and resource saving.
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Description

technical field

[0001] The invention relates to the technical field of polyurethane elastomers, in particular to polyurethane elastomers containing stereocomplex crystalline polylactic acid hard segments and a preparation method thereof. Background technique

[0002] As a new polymer material, polyurethane elastomers are widely used in the national economy and national defense industry. According to whether the elastomer can be heated and plasticized, it can be divided into two categories: thermosetting and thermoplastic elastomers. Thermoplastic polyurethane elastomer, also known as thermoplastic polyurethane rubber, is mostly a block-type linear polymer that can be melted and plasticized after heating; thermosetting polyurethane elastomer is chemically crosslinked under the action of heat, catalyst, pressure, ultraviolet light, etc. The body-shaped polyurethane elastomer formed by the reaction will no longer melt when heated, but will decompose when heated. Due to its ex...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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