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Low-density foamed thermoplastic polyurethane elastic body and preparation process thereof

A plastic polyurethane and preparation technology, which is applied in the field of low-density foamed thermoplastic polyurethane elastomer and its preparation, can solve problems such as blanks, and achieve the effect of increasing the mixing effect, high tensile force, and high tension

Inactive Publication Date: 2013-01-30
SHANDONG AOBANG POLYURETHANE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, thermoplastic polyurethane (TPU) is a well-known thermoplastic elastomer. They have very high tensile strength, tear strength and high elasticity at low temperature, as well as excellent wear resistance and surface finish. They are also resistant to oil and fat. and the high stability of many solvents, and the stability against UV radiation. As a new material, thermoplastic polyurethane (TPU) is difficult to blend with common foaming agents to make light, soft and high-elastic materials. How to maintain its inherent High performance while reducing density and price to make a wear-resistant, soft, high-elastic substrate has become the key to technology. At present, there is no thermoplastic polyurethane that can be blended with a foaming agent to make a light, soft, and high-elastic material. Technology is still blank

Method used

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  • Low-density foamed thermoplastic polyurethane elastic body and preparation process thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The low-density expanded thermoplastic polyurethane elastomer of the present embodiment comprises the raw material of following weight ratio:

[0027] Macromolecular polyol: chain extender: isocyanate: azo foaming agent = 50:10:40:5;

[0028] The isocyanate is diphenylmethane diisocyanate, the azo foaming agent is azodicarbonamide, the macromolecular polyol is polyester polyol, synthesized from adipic acid and diethylene glycol, and the hydroxyl value is 56±3mgKOH / g , the acid value is 0.1-0.3mgKOH / g, the chain extender is ethylene glycol, and the density of low-density foamed thermoplastic polyurethane elastomer is 0.3g / cm 3 , the corresponding hardness is 55 degrees Shore A, the tensile strength of the low-density foamed thermoplastic polyurethane elastomer is 26MP, and the tear strength is 55N / mm.

Embodiment 2

[0030] The difference between this embodiment and embodiment 1 is: comprise the raw material of following weight ratio:

[0031] Isocyanate: macromolecular polyol: chain extender: azo foaming agent = 60:8:32:6;

[0032] The isocyanate is a mixture of hexamethylene diisocyanate and toluene diisocyanate. The azo foaming agent is 2,2-azobisisobutyronitrile. The macromolecular polyol is ethylene oxide polyether polyol. The value is 110±3mgKOH / g, the acid value is 0-0.10mgKOH / g, the chain extender is propylene glycol, and the density of low-density foamed thermoplastic polyurethane elastomer is 0.26g / cm 3 , the corresponding hardness is Shore A type 75 degrees; the tensile strength of low-density foamed thermoplastic polyurethane elastomer is 25MP, and the tear strength is 50N / mm;

Embodiment 3

[0034] The difference between this embodiment and embodiment 1 is: comprise the raw material of following weight ratio:

[0035] Isocyanate: macromolecular polyol: chain extender: azo foaming agent = 55:9:37:5;

[0036] The isocyanate is a mixture of diphenylmethane diisocyanate, hexamethylene diisocyanate and toluene diisocyanate. The azo foaming agent is diisopropyl azodicarboxylate. The macromolecular polyol is polyester polyol. Synthesized from adipic acid and diethylene glycol, the hydroxyl value is 56±3mgKOH / g, the acid value is 0.1-0.3mgKOH / g, the chain extender is butylene glycol, and the density of the low-density foamed thermoplastic polyurethane elastomer is 0.31g / cm 3 , the corresponding hardness is Shore A type 65 degrees, the tensile strength of the low-density foamed thermoplastic polyurethane elastomer is 27MP, and the tear strength is 52N / mm.

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Abstract

The invention relates to a low-density foamed thermoplastic polyurethane elastic body and a preparation process thereof, belonging to the technical fields of polyurethane elastic bodies and preparation processes of the polyurethane elastic bodies. The low-density foamed thermoplastic polyurethane elastic body comprises the following raw materials such as a macromolecular polyol, a chain extender,an isocyanate and an azo foaming agent in a weight ratio of (40-60): (8-11): (32-49): (3.5-6); and a production process comprises the following steps of: 1, metering, transporting and mixing the raw materials; 2, reacting and extruding; 3, underwater pelletizing; 4, vulcanizing; and 5, inspecting. The molecular structure of the low-density foamed thermoplastic polyurethane elastic body provided by the invention is formed by rigid chain segments obtained by reaction of the isocyanate and the chain extender and flexible chain segments obtained by reaction of the isocyanate and the macromolecular polyol in an alternate manner, has unique comprehensive properties, excellent characteristics such as high tension, high tensile force, high toughness and aging resistance and leading wear resistance and is a mature environmentally-friendly material.

Description

technical field [0001] The invention relates to a low-density foamed thermoplastic polyurethane elastomer and a preparation process thereof, and belongs to the technical field of polyurethane elastomers and the preparation process thereof. Background technique [0002] At present, thermoplastic polyurethane (TPU) is a well-known thermoplastic elastomer. They have very high tensile strength, tear strength and high elasticity at low temperature, as well as excellent wear resistance and surface finish. They are also resistant to oil and fat. And the high stability of many solvents, and the stability against UV radiation. As a new material, thermoplastic polyurethane (TPU) is difficult to blend with common foaming agents to make light, soft and high-elastic materials. How to maintain its inherent High performance while reducing density and price to make a wear-resistant, light, soft, high-elastic substrate has become the key to technology. At present, there is no thermoplastic p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/66C08G18/42C08G18/48C08J9/10C08G101/00
Inventor 鞠立民唐建功隋巍王琦
Owner SHANDONG AOBANG POLYURETHANE
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