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Mechanical property-improved polyurethane elastomer and preparation method thereof

A polyurethane elastomer and polyurethane prepolymer technology, which is applied in the field of polyurethane elastomer and its preparation, can solve the problem of low tear strength and achieve the effect of improving tear and tensile properties

Active Publication Date: 2016-04-20
SHANDONG INOV POLYURETHANE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Polytetrahydrofuran-type polyurethane elastomers have excellent resilience, hydrolysis resistance, abrasion resistance, high temperature resistance and low-temperature flexibility, but the same as polyether-type elastomers, polyurethane elastomers prepared from polytetrahydrofuran ether polyols tear Low strength, especially trouser tear strength

Method used

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  • Mechanical property-improved polyurethane elastomer and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Preparation of prepolymer: PTMG1000 46.6%, PE-4010 31.08%, TDI-80 22.32%, react at 85°C for 3 hours, vacuum (-0.095MPa) to remove air bubbles, and obtain a prepolymer with an isocyanate content of 4.2% .

[0034] The prepolymer and the chain extender MOCA are mixed and reacted at a mass ratio of 100 / 12.5, the mixing temperature is 80°C, poured into the mold, the mold temperature is 120°C, vulcanized for 60 minutes to release the mold, and the product is post-vulcanized at 100°C for 12 hours , to obtain a polyurethane elastomer product with a hardness of Shore A90.

Embodiment 2

[0036] Preparation of prepolymer: PTMG1000 66.0%, PE-400 77.7%, TDI-100 26.3%, react at 80°C for 2.5 hours, vacuum (-0.095MPa) to remove air bubbles, and obtain a prepolymer with an isocyanate content of 6.2% .

[0037] The prepolymer and the chain extender E-300 are mixed and reacted at a mass ratio of 100 / 14.5, the mixing temperature is 75°C, poured into the mold, the mold temperature is 115°C, vulcanized for 40 minutes to release the mold, and the product is post-vulcanized in an environment of 120°C After 12 hours, a polyurethane elastomer product with a hardness of Shore A95 was obtained.

Embodiment 3

[0039] Preparation of prepolymer: PTMG650 42.2%, PE-2410 27.4%, TDI-100 15.7%, TDI-80 14.7%. React at 75°C for 2 hours, remove air bubbles under vacuum (-0.095MPa), and obtain a prepolymer with an isocyanate content of 7.5%.

[0040] The prepolymer and the chain extender MOCA are mixed and reacted at a mass ratio of 100 / 22.5, the mixing temperature is 85°C, poured into the mold, the mold temperature is 100°C, vulcanized for 30 minutes, and the product is post-vulcanized for 12 hours in an environment of 110°C , to obtain a polyurethane elastomer product with a hardness of Shore D65.

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Abstract

The invention relates to a mechanical property-improved polyurethane elastomer and a preparation method thereof, belonging to the technical field of polyurethane elastomer modification. The mechanical property-improved polyurethane elastomer provided by the invention consists of a component A and a component B in a weight ratio of 100:(12.5-22.5), wherein the component A is a polyurethane prepolymer prepared from polytetrahydrofuran ether diol, polyester diol and diisocyanate; the component B is a chain extender; the number-average molecular weight of the polytetrahydrofuran ether diol is 650-1000; and the polyester diol is prepared from adipic acid and 1,4-butanediol or from adipic acid and ethylene glycol and 1,4-butanediol, and the functionality is 2 while the number-average molecular weight is 650-1000. According to the mechanical property-improved polyurethane elastomer provided by the invention, the tearing property and tensile property are improved. The invention also provides an energy-saving and environment-friendly preparation method which is simple and feasible.

Description

technical field [0001] The invention relates to a polyurethane elastomer with improved mechanical properties and a preparation method thereof, belonging to the technical field of polyurethane elastomer modification. Background technique [0002] Polyurethane elastomer is a high molecular block polymer containing more carbamate groups in the main chain. It has a unique structure of soft and hard segment block copolymers. It has excellent comprehensive mechanical properties, especially resistance grinding performance. Polytetrahydrofuran-type polyurethane elastomers have excellent resilience, hydrolysis resistance, abrasion resistance, high temperature resistance and low-temperature flexibility, but the same as polyether-type elastomers, polyurethane elastomers prepared from polytetrahydrofuran ether polyols tear Low strength, especially trouser tear strength. Polyester polyurethane elastomers have higher mechanical properties due to the greater polarity of the ester bonds o...

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/42C08G18/48C08G18/32C08G18/12
CPCC08G18/12C08G18/3814C08G18/3868C08G18/4018C08G18/4238C08G18/4854C08G18/6618
Inventor 陈伟陈海良刘兆阳蒋东旭
Owner SHANDONG INOV POLYURETHANE