Polyolefin polyol modified thermoplastic polyurethane elastomer and preparation method thereof

A technology of polyolefin polyol and thermoplastic polyurethane, which is applied in the field of polyolefin polyol modified thermoplastic polyurethane elastomer and its preparation, can solve the problems of low hydrolysis stability and large dynamic heat generation, and achieves improved hydrolysis resistance and other properties. Effect

Inactive Publication Date: 2020-04-24
SHANGHAI HUIDE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, ordinary polyester / ether thermoplastic polyurethane elastomers have the disadvantages of high moisture permeability, low hydrolytic stability, and large dynamic heat generation.

Method used

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  • Polyolefin polyol modified thermoplastic polyurethane elastomer and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The preparation method of the thermoplastic polyurethane elastomer modified by polyolefin polyol comprises the following steps: (1) taking by weight 20 parts of predried polybutadiene polyol with a molecular weight of about 1000 and 40 parts of predried Mix and stir polytetrahydrofuran polyol with a molecular weight of about 1000g / mol evenly, add 33.4 parts of diphenylmethane diisocyanate into the reaction vessel, heat up to 80°C under constant stirring, and perform a vacuum reaction; (2) Release the vacuum , add 6.6 parts of pre-dried butanediol, stir quickly, the temperature of the material gradually rises to 120 ° C, the viscosity increases significantly, stop stirring, pour it into a polytetrafluoroethylene tray, mature, cool and crush to obtain modified thermoplastic polyurethane elastomer.

Embodiment 2

[0034] The preparation method of the thermoplastic polyurethane elastomer modified by polyolefin polyol comprises the following steps: (1) the pre-dried molecular weight of 30 parts by weight is 2000 hydroxyl-terminated polybutadiene-acrylonitrile and 30 parts The pre-dried polyester polyol with a molecular weight of about 2000g / mol was mixed and stirred evenly, and 33.9 parts of hydrogenated phenylalkyl diisocyanate was added to the reaction vessel, and the temperature was raised to 80°C under constant stirring, and the vacuum reaction was carried out; ( 2) Remove the vacuum, add 6.1 parts of pre-dried ethylene glycol, stir rapidly, the temperature of the material gradually rises to 120 ° C, the viscosity increases significantly, stop stirring, pour it into a polytetrafluoroethylene tray, mature, cool and crush to obtain improved A thermoplastic polyurethane elastomer.

Embodiment 3

[0036] The preparation method of the thermoplastic polyurethane elastomer modified by polyolefin polyol comprises the following steps: (1) taking by weight the pre-dried molecular weight of 25 parts is the hydroxy-terminated styrene-butadiene liquid rubber of 3000 and 25 parts of pre-dried styrene-butadiene liquid rubber The polyester polyol with a molecular weight of about 2000g / mol is mixed and stirred evenly, and 21.7 parts of hexamethylene diisocyanate are added to the reaction container, and the temperature is raised to 75°C under constant stirring, and the vacuum reaction is performed; (2) Release the vacuum , add 13.1 parts of pre-dried hexanediol, stir quickly, the temperature of the material gradually rises to 115°C, the viscosity increases significantly, stop stirring, pour it into a polytetrafluoroethylene tray, mature, cool and pulverize to obtain modified thermoplastic polyurethane elastomer.

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Abstract

The invention discloses a polyolefin polyol modified thermoplastic polyurethane elastomer which comprises the following components in parts by weight: 20-30 parts of polyolefin polyol, 30-40 parts ofpolyester/ether polyol, 20-40 parts of diisocyanate, and 5-20 parts of a chain extender. The invention also discloses a preparation method of the polyolefin polyol modified thermoplastic polyurethaneelastomer. The material provided by the invention has the advantages of excellent wear resistance, high hardness, rich elasticity, good mechanical strength, excellent oil resistance and excellent oxidation resistance of a thermoplastic polyurethane elastomer, and also has the characteristics of excellent low-temperature performance, excellent hydrolysis resistance and small dynamic heat generationof polyolefin rubber.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a polyolefin polyol modified thermoplastic polyurethane elastomer and a preparation method thereof. Background technique [0002] Thermoplastic polyurethane elastomer has the advantages of firmness, wear resistance, corrosion resistance, aging resistance and low pollution, and is a widely used polymer material. Polyolefin polyol is a low molecular weight telechelic liquid polymer. Because of its low glass transition temperature, good transparency, low viscosity, non-volatile, oil and aging resistance, low temperature and good processing performance, it is widely used in military and civilian fields. Has a wide range of applications. [0003] However, ordinary polyester / ether thermoplastic polyurethane elastomers have the disadvantages of high moisture permeability, low hydrolytic stability, and large dynamic heat generation. Contents of the invention [...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/69C08G18/66C08G18/48C08G18/42C08G18/12C08G18/32
CPCC08G18/12C08G18/4018C08G18/42C08G18/4854C08G18/698C08G18/3206
Inventor 钱建中徐强王平平周伟
Owner SHANGHAI HUIDE TECH CO LTD
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