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Low-melting-point biodegradable polyurethane elastomer

A polyurethane elastomer, biodegradable technology, applied in the field of polyurethane elastomer materials, can solve the problems of poor material performance, difficult processing, high melting point, and achieve the effects of lowering temperature, beneficial to blending modification processing, and excellent mechanical properties

Inactive Publication Date: 2013-09-25
南通华盛高聚物科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, general biodegradable polyurethane elastomer materials have a relatively high melting point (>170°C), which leads to a processing temperature above 200°C, while biodegradable polymer materials such as polylactic acid are prone to thermal degradation when processed at high temperatures, resulting in both difficult to blend
Although some polyurethane elastomer materials with lower hardness can be melt-processed at lower temperatures, due to their low crystallinity and slow crystallization speed, it also brings great difficulties to processing, and the modified material properties bad

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Example 1 , a low melting point biodegradable polyurethane elastomer

[0027] 1000g of polybutylene adipate with a molecular weight of 800 and 10g of polyethylene glycol with a molecular weight of 400 were added to the reactor, heated to 120°C, dried under reduced pressure for 2 hours, and then heated to 180°C under nitrogen protection. Stir until it melts evenly to obtain a molten mixture;

[0028] Add 200g of hexamethylene diisocyanate and 0.12g of triethylamine to the reactor, lower the temperature to 150°C to 160°C for reaction, then add 12.1g of ethylene glycol, and continue the reaction for 3min to 5min to obtain biodegradable polyurethane elastic body.

[0029] The melting point of the above-mentioned biodegradable polyurethane elastomer was measured to be 155° C., the tensile strength was 26 MPa, the elongation at break was 650%, and the three-month biodegradation rate was 72%.

Embodiment 2

[0030] Example 2 , a low melting point biodegradable polyurethane elastomer

[0031] Add 950g of polyethylene adipate with a molecular weight of 1000 and 30g of polyethylene glycol with a molecular weight of 1000 into the reactor, heat to 120°C, dry under reduced pressure for 2 hours, and then raise the temperature to 180°C under nitrogen protection. Stir until it melts evenly to obtain a molten mixture;

[0032] Add 500g of toluene diisocyanate and 0.74g of N,N-dimethylcyclohexylamine to the reactor, lower the temperature to 150°C to 160°C for reaction, then add 74g of glycerol, continue the reaction for 3min to 5min, and obtain biodegradable polyurethane elastomer.

[0033] The melting point of the biodegradable polyurethane elastomer was measured to be 149°C, the tensile strength was 22MPa, the elongation at break was 710%, and the three-month biodegradation rate was 68%.

Embodiment 3

[0034] Example 3 , a low melting point biodegradable polyurethane elastomer

[0035] 900g of polybutylene succinate with a molecular weight of 2000 and 15g of polyethylene glycol with a molecular weight of 1500 were added to the reactor, heated to 120°C, dried under reduced pressure for 2 hours, and then heated to 180°C under nitrogen protection. Stir until it melts evenly to obtain a molten mixture;

[0036] Add 400g of 4,4-diphenylmethane diisocyanate and 1.32g of N-ethylmorpholine to the reactor, lower the temperature to 150°C~160°C for reaction, then add 131.5g of trimethylolpropane, and continue the reaction for 3min~ 5min to obtain a biodegradable polyurethane elastomer.

[0037] The melting point of the above-mentioned biodegradable polyurethane elastomer was measured to be 127° C., the tensile strength was 27 MPa, the elongation at break was 670%, and the three-month biodegradation rate was 73%.

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Abstract

The invention provides a low-melting-point biodegradable polyurethane elastomer. The low-melting-point biodegradable polyurethane elastomer is prepared by adopting the following steps of: step one, weighing the following components: 70-100 parts by weight of polyester polyol, 1-10 parts by weight of polyether polyol and 20-90 parts by weight of diisocyanate; step two, heating and fusing the polyester polyol and the polyether polyol to obtain a fused mixture; step three, fully drying the fused mixture, and adding a catalyst and the diisocyanate for reaction; step four, adding a chain extender, and continuously reacting to obtain the low-melting-point biodegradable polyurethane elastomer. The biodegradable polyurethane elastomer provided by the invention has excellent mechanical property, the temperature of fusion processing is reduced, meanwhile, the relatively fast crystallization speed of the low-melting-point biodegradable polyurethane elastomer is maintained, so that the blending modification processing is facilitated, and therefore, the polyurethane elastomer material provided by the invention is suitable for the modification of biodegradable high polymer materials.

Description

technical field [0001] The invention relates to a polyurethane elastomer material, in particular to a biodegradable polyurethane elastomer with a low melting point. Background technique [0002] Polyurethane elastomer has good mechanical properties and can be processed alone or used for blending modification of other polymer materials. As a polyurethane elastomer material, biodegradable polyurethane elastomer has good biodegradability. By blending and modifying biodegradable polymer materials such as polylactic acid, it can make up for the shortcomings of poor mechanical properties of polylactic acid and other biodegradable polymer materials. , At the same time, fully biodegradable polymer material products can be prepared. [0003] However, general biodegradable polyurethane elastomer materials have a relatively high melting point (>170°C), which leads to a processing temperature above 200°C, while biodegradable polymer materials such as polylactic acid are prone to the...

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/42C08G18/48C08G18/32
CPCC08G18/4854C08G18/4018C08G18/4213C08G18/4216C08G18/4238C08G18/4825C08G18/4833C08G18/72C08G2230/00
Inventor 张春华
Owner 南通华盛高聚物科技股份有限公司
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