Preparation method of polyurethane elastomer containing stereoregular complex 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 mechanical strength and modulus, and high melting point

Active Publication Date: 2017-03-15
ZHEJIANG UNIV
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Problems solved by technology

Therefore, elastomers often present an amorphous or low crystallinity state, and the regulation of the properties of thermosetting polyurethane elastomers based on segmental crystallization is usually difficult to achieve, and there are few research reports

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  • Preparation method of polyurethane elastomer containing stereoregular complex crystal
  • Preparation method of polyurethane elastomer containing stereoregular complex crystal
  • Preparation method of polyurethane elastomer containing stereoregular complex crystal

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Embodiment Construction

[0031] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0032] In the following examples and comparative examples, the double-terminated hydroxyl-terminated PEB used was purchased from Sartomer, USA. The L-lactide used was purchased from Purac, and the D-lactide was provided by Zhejiang Mingzhong Institute of Biomedical Materials and Devices. L-lactide and D-lactide were recrystallized in ethyl acetate to remove impurities, and dried in vacuum at 60°C to constant weight. HDI and IPDI were purchased from Wanhua Chemical Company, and PHDI, stannous octoate, and dibutyltin dilaurate were purchased from Sigma Company.

[0033] PLLA-PEB-PLLA and PDLA-PEB-PDLA triblock copolymers terminated with double-terminal hydroxyl groups were synthesized according to the method described in Chinese patent (patent number: ZL201510058848.4). The specific method is as follows: add PEB and lactide with prede...

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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.

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...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/42
CPCC08G18/428C08G2230/00
Inventor 潘鹏举周健单国荣包永忠
Owner ZHEJIANG UNIV
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