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Supercritical fluid foaming method of thermoplastic elastomer and its products and applications

A thermoplastic elastomer and supercritical fluid technology, which is applied in the field of polymer preparation, can solve the problems of thermoplastic elastomer foaming materials such as decreased mechanical properties, large shrinkage rate, and complicated process, and achieves short saturation time, small shrinkage rate, and process. simple effect

Active Publication Date: 2022-02-11
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The problem to be solved by the present invention is to overcome the complex process of the thermoplastic elastomer foaming method in the prior art, and the defects of the thermoplastic elastomer foamed material produced by it have decreased mechanical properties and large shrinkage, and provide a supercritical foaming method for thermoplastic elastomers. Fluid foaming method and its products and applications

Method used

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  • Supercritical fluid foaming method of thermoplastic elastomer and its products and applications
  • Supercritical fluid foaming method of thermoplastic elastomer and its products and applications
  • Supercritical fluid foaming method of thermoplastic elastomer and its products and applications

Examples

Experimental program
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Effect test

Embodiment 1

[0089] The preparation of embodiment 1TPU foam material

[0090] (1) Place the TPU sheet in the mold cavity 5, and heat the mold cavity 5 with programmed temperature control at a heating rate of 10°C / min to a foaming temperature of 150°C;

[0091] (2) Open the first ball valve 4, start the syringe pump 3, and supercritical N 2 Inject into the mold cavity 5, the cavity pressure after injection is 5MPa, then supercritical CO 2 Inject in the mold cavity 5, the mold cavity pressure is 15MPa after injecting, close the first ball valve 4, keep supercritical state 90min; Wherein, N 2 and CO 2 The pressure ratio is 1:2;

[0092] (3) Open the second ball valve 7 to quickly relieve the pressure on the mold cavity 5 at a rate of 400 MPa / s to obtain a TPU microcellular foaming material.

Embodiment 2

[0093] The preparation of embodiment 2TPU foam material

[0094] In the step (2) of embodiment 2, supercritical N 2 Inject into cavity 5, the cavity pressure after injection is 10MPa, wherein, N 2 and CO 2 The pressure ratio is 2:1; Other process conditions are all with embodiment 1.

Embodiment 3

[0095] The preparation of embodiment 3TPU foam material

[0096] (1) Place the TPU sheet in the mold cavity 5, and heat the mold cavity 5 with programmed temperature control at a heating rate of 10°C / min to a foaming temperature of 150°C;

[0097] (2) Open the first ball valve 4, start the syringe pump 3, and supercritical N 2Inject into the mold cavity 5, the cavity pressure after injection is 10MPa, and then the supercritical CO 2 Inject in the mold cavity 5, the mold cavity pressure is 15MPa after injecting, close the first ball valve 4, keep the supercritical state 10min; Wherein, N 2 and CO 2 The pressure ratio is 2:1;

[0098] (3) Open the needle valve 6, slowly release the pressure to the mold cavity 5 to 0MPa, the pressure relief rate is 0.03MPa / s, and close the needle valve 6;

[0099] (4) Open the first ball valve 4, start the syringe pump 3, and supercritical N 2 Inject into the mold cavity 5, the cavity pressure after injection is 10MPa, and then the supercrit...

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Abstract

The invention discloses a supercritical fluid foaming method of a thermoplastic elastomer and its product and application. The steps of the preparation method of this thermoplastic elastomer foaming material are as follows: (1) thermoplastic elastomer material is warmed up to foaming temperature in mold cavity; Wherein, foaming temperature is (T g +180℃)~(T g +200°C); (2) inject supercritical fluid into the mold cavity and maintain a supercritical state; wherein, the supercritical fluid is supercritical N 2 and supercritical CO 2 mixed gas; supercritical N 2 and the supercritical CO 2 The pressure ratio is (0.3-2.2): 1; (3) The mold cavity is depressurized. The preparation method of thermoplastic elastomer foaming material in the present invention has simple process, low energy consumption, short total saturation time, and effectively improves production efficiency; and the thermoplastic elastomer foaming material in the present invention has high foaming ratio and shrinkage rate Small, small cell diameter, high cell density, excellent mechanical properties.

Description

technical field [0001] The invention relates to the field of polymer preparation, in particular to a supercritical fluid foaming method of a thermoplastic elastomer and its product and application. Background technique [0002] Thermoplastic elastomers are materials that combine the elasticity of rubber with the melt flow and reusability of thermoplastics. Because of its excellent physical and mechanical properties and electrical insulation properties, it is widely used in the fields of automobiles, electrical and electronic, medical equipment, construction packaging, etc. Currently, common thermoplastic elastomers include thermoplastic polyurethane elastomer rubber (TPU), thermoplastic polyester elastomer (TPEE), nylon 12 elastomer (PEBA), and the like. [0003] Foamed polymer material is a polymer material formed by dispersing a large amount of gas in the material. It has the characteristics of light weight, heat insulation, sound absorption, vibration reduction, etc., an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29C44/02B29C44/34B29C44/60C08J9/12C08L75/04
CPCB29C44/02B29C44/34B29C44/60C08J9/122C08J2203/08C08J2203/06C08J2300/26C08J2375/04
Inventor 赵玲陈弋翀刘涛胡冬冬吴楷文许志美奚桢浩宗原凌轶杰
Owner EAST CHINA UNIV OF SCI & TECH
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