Micro-crosslinking elastomer foaming material as well as preparation method and application thereof

A foaming material and micro-crosslinking technology, which is applied in the field of elastomer foaming materials, can solve problems such as creep, poor dimensional stability, and permanent deformation of melted polymers in crystal regions, and achieve reduced permanent deformation and good dimensional stability , Increase the effect of foaming ratio

Active Publication Date: 2020-04-17
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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  • Micro-crosslinking elastomer foaming material as well as preparation method and application thereof
  • Micro-crosslinking elastomer foaming material as well as preparation method and application thereof
  • Micro-crosslinking elastomer foaming material as well as preparation method and application thereof

Examples

Experimental program
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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, and a preparation method and an application thereof, the method comprises the following steps: S1, carrying out a crosslinking reaction on a low melting point thermoplastic elastomer to obtain a micro-crosslinked vulcanized rubber with a gel content of not more than 60 wt%; wherein the low-melting-point elastomer is selected from one or more of EVA, POE, OBC, EPDM and SEBS; and S2, carrying out saturation on the micro-crosslinked vulcanized rubber by adopting a physical foaming agent, and after saturation equilibrium, carrying out heating or pressure relief to obtain the micro-crosslinked elastomer foaming material. According to the invention, a micro-crosslinking structure is introduced, so that the foaming performanceof the low-melting-point thermoplastic elastomer is greatly improved, the foaming interval of the material is effectively widened, the foaming ratio and thermal stability of the elastomer are increased, the permanent deformation of foam is reduced, the size stability of the foam is better, and the application requirements in the field of cushioning products such as shoe insoles are met; and meanwhile, the elastomer foam also has melting recoverability.

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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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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