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A kind of micro-crosslinked elastomer foam material, its preparation method and application

A foaming material and micro-crosslinking technology, applied in the field of elastomer foaming materials, can solve the problems of creep, poor dimensional stability and poor heat resistance of molten polymer in the crystal region, and reduce permanent deformation and dimensional stability. Good, widening the effect of foaming interval

Active Publication Date: 2022-05-17
ANTA CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, for EPDM rubber, ethylene octene copolymer, ethylene vinyl acetate and other low-melting thermoplastic elastomers currently used in the market, if the foamed product is obtained by physical foaming, due to the low melting point of the raw material resin, in During use, the crystalline regions of the molten polymer in the foam can creep causing severe permanent deformation
Moreover, the heat resistance of this foam material is poor, severe shrinkage will occur at a higher service temperature, and it has poor dimensional stability.

Method used

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  • A kind of micro-crosslinked elastomer foam material, its preparation method and application
  • A kind of micro-crosslinked elastomer foam material, its preparation method and application
  • A kind of micro-crosslinked elastomer foam material, its preparation method and application

Examples

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preparation example Construction

[0021] The invention provides a kind of preparation method of micro-crosslinked elastomer foaming material, comprises the following steps:

[0022] S1. Carry out cross-linking reaction on the low-melting point thermoplastic elastomer to obtain a slightly cross-linked vulcanizate with a gel content of no more than 60 wt%; the low-melting point elastomer is selected from one of EVA, POE, OBC, EPDM and SEBS or various;

[0023] S2. Saturating the micro-crosslinked vulcanized rubber with a physical foaming agent, and after the saturation is balanced, the micro-crosslinked elastomer foam material is obtained by raising the temperature or releasing the pressure.

[0024] In order to improve the foaming properties of low-melting thermoplastic elastomers, reduce the permanent deformation of foam materials during use, and have better dimensional stability, the present invention provides a foamable micro-crosslinked thermoplastic elastomer that can be melted and recycled. The method of...

Embodiment 1

[0049] EPDM (EPDM, Dow, 4820P) was selected as the base material. First, EPDM was put into an internal mixer, mixed at 80°C for 4 minutes, then 0.2phr of BIPB was added, and the internal mixing was continued for 4 minutes. Then the rubber is discharged, and after standing for 24 hours, the positive vulcanization time t of the rubber at 180°C is measured by a vulcanization meter. 90 . Next, place the obtained rubber material in a mold with a thickness of 1mm, and heat press it with a flat vulcanizer at a pressure of 10MPa at a temperature of 180°C. 90 +2min, take out the sample and cool for 5min to obtain a slightly crosslinked vulcanizate with a thickness of 1mm, a gel content of 45wt%, and a crosslinking density of 6.0×10 -6 mol / cm 3 .

[0050] The micro-crosslinked vulcanizate prepared in this example was placed in an autoclave for gas saturation. The saturated gas was carbon dioxide, the saturation pressure was 5 MPa, the saturation temperature was 25°C, and the saturati...

Embodiment 2

[0059] In addition to using 20MPa / 90℃ supercritical N 2 It is a foaming agent, except for depressurizing physical foaming, other operations are the same as in Example 1; an EPDM foaming material with a micro-crosslinked structure is obtained by physical foaming.

[0060] The density of EPDM foam material is 0.05g / cm 3 , The magnification is 17.2 times, the dimensional shrinkage rate after heat treatment at 70°C / 40min is 4%, and the foaming material is melted and molded to obtain a transparent film.

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Abstract

The invention provides a micro-crosslinked elastomer foaming material, its preparation method and application, the method comprising: S1, performing a crosslinking reaction on a low-melting thermoplastic elastomer to obtain a micro-crosslinked foam with a gel content of no more than 60 wt%. Vulcanized rubber; the low-melting point elastomer is selected from one or more of EVA, POE, OBC, EPDM and SEBS; S2, the micro-crosslinked vulcanized rubber is saturated with a physical foaming agent, and after the saturation is balanced, pass Raise the temperature or release the pressure to obtain the micro-crosslinked elastomer foam material. The invention introduces a micro-crosslinked structure, which greatly improves the foaming performance of this type of low-melting thermoplastic elastomer, effectively widens the foaming range of the material, increases the foaming ratio of the elastomer, and improves thermal stability. The permanent deformation of the foam is reduced, the dimensional stability of the foam is better, and the application requirements in the field of cushioning products such as shoe midsoles are met; at the same time, the elastomer foam also has melting recyclability.

Description

technical field [0001] The invention relates to the technical field of elastomer foaming materials, in particular to a micro-crosslinked elastomer foaming material, its preparation method and application. Background technique [0002] Soft foam materials have excellent properties such as light weight, cushioning, shock absorption, sound insulation, heat insulation, etc., and are widely used in shoe midsoles, car mats, sealing, damping, sporting goods, furniture and other fields. At present, the preparation process of soft foaming materials is mainly divided into two methods: chemical foaming and physical foaming. Chemical foaming is a widely used and relatively mature foaming method. It mainly uses chemical foaming agents and crosslinking agents, which can be reacted by molding, extrusion, injection, etc. to prepare foamed materials. Azodimethylamide (AC blowing agent) is the most widely used chemical blowing agent; however, the foam prepared by this foaming method has envi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/12C08J3/28C08L23/16C08L23/08C08L53/00C08K5/14
CPCC08J9/122C08J3/28C08J9/0023C08J2203/06C08J2323/16C08J2203/08C08J2323/08C08J2353/00C08K5/14
Inventor 熊祖江埃斯塔尼斯劳·菲利普·苏亚雷斯·多斯桑托斯安格斯·尼姆林·沃德洛李苏刘艺龙
Owner ANTA CHINA
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