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Low-density and high-porosity silicone rubber foam material and preparation method thereof

A foam material and silicone rubber technology, applied in the field of low-density high-porosity silicone rubber foam material and its preparation, can solve the problem that the foaming speed and the vulcanization speed are not easy to match, the reproducibility of the experimental results is poor, and it is difficult to obtain low-density and high-porosity silicone rubber. Foam materials and other problems, to achieve the effect of rich cell structure, avoid cell collapse and backlog, and simple process

Inactive Publication Date: 2017-02-22
SOUTHWEAT UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the chemical foaming method has a relatively simple process and can obtain low-density foam materials, it is difficult to match the foaming speed and the vulcanization speed, and the reproducibility of the experimental results is poor. It is difficult to obtain low-density and high-porosity foam materials by baking and drying, such as patent CN2000610021103.1, etc.

Method used

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  • Low-density and high-porosity silicone rubber foam material and preparation method thereof
  • Low-density and high-porosity silicone rubber foam material and preparation method thereof
  • Low-density and high-porosity silicone rubber foam material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] Step 1. In parts by weight, take 100 parts of dimethyl silicone rubber and add it to the double-roller open mill, masticate at room temperature for 10 minutes, then add 30 parts of precipitated silica, 3 parts of high molecular hydroxy silicone oil, and knead In 10 minutes, add 500 parts of urea and 4 parts of triallyl cyanurate, and continue mixing for 10 minutes to obtain a mixed material, which is stored statically for 48 hours. The refining material is molded into a sheet or a block on a tablet press; the rotary speed of the two-roll mill is set to 200r.min -1 ;

[0053] Step 2. After the formed sheet or block is wrapped in plastic or aluminum foil, place it in the air at room temperature 60 Carry out radiation cross-linking in the Coγ radiation field, the absorbed dose is 50kGy, so that the rubber material can be cross-linked at one time, and the sample is obtained;

[0054] Step 3: Remove the plastic seal of the radiation-crosslinked sample, soak it in a water b...

Embodiment 2

[0056] Step 1. In parts by weight, take 100 parts of methyl vinyl silicone rubber and add it to a double-roller mill, masticate it at room temperature for 5 minutes, then add 50 parts of fumed silica and 7 parts of low-molecular-weight hydroxy silicone oil, mix After refining for 10 minutes, add 200 parts of ammonium carbonate and 5 parts of triallyl cyanurate sensitizer, and continue mixing for 10 minutes to obtain a mixed material, which is stored statically for 24 hours, and then the rubber material is re-milled for 10 minutes at room temperature , at room temperature, the compounded material is molded into a sheet or a block on a tablet press; the rotating speed of the drum of the two-roll mill is set to 600r.min -1 ;

[0057] Step 2. After the formed sheet or block is wrapped in plastic or aluminum foil, place it in the air at room temperature 60 Carry out radiation cross-linking in the Coγ radiation field, the absorbed dose is 100kGy, so that the rubber material can be ...

Embodiment 3

[0060] Step 1. In parts by weight, take 100 parts of methyl vinyl silicone rubber and add it to a double-roller mill, masticate it at room temperature for 5 minutes, then add 10 parts of fumed silica and 7 parts of low-molecular hydroxy silicone oil, mix After kneading for 5 minutes, add 600 parts of urea and 1 part of 1,6-hexanediol diacrylate, and continue kneading for 7 minutes to obtain the kneaded material, which is stored statically for 36 hours, and then the rubber is kneaded at room temperature for 10 minutes. At room temperature, the compounded material is molded into a sheet or a block on a tablet press; the rotating drum speed of the two-roll mill is set to 200r.min -1 ;

[0061] Step 2. After the formed sheet or block is wrapped in plastic or aluminum foil, place it in the air at room temperature 60 Carry out radiation cross-linking in the Coγ radiation field, the absorbed dose is 30kGy, so that the rubber material can be cross-linked at one time, and the sample i...

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Abstract

The invention discloses a low-density and high-porosity silicone rubber foam material and a preparation method thereof. The method is characterized by comprising the following steps: 100 parts of silicone rubber, 10 to 50 parts of a reinforcing agent, 1 to 7 parts of a control agent, 200 to 600 parts of a pore-forming agent, and 0 to 5 parts of a sensibilizer are mixed and molded, and then are radiated through gamma ray, so as to be subjected to crosslinking; the amount of radiation absorber is 30 to 100kGy; then the low-density and high-porosity silicone rubber foam material with excellent performance is obtained after elution and freeze drying. The material has the advantages that the technology is simple, complex chemical control process or professional auxiliary equipment is not needed, simple equipment, such as a two-roll mill, is only needed, and the cost is low; the silicone rubber foam material has the characteristics of low density and high porosity, is soft in material and excellent in elasticity, and can serve as a filling, positioning, sound-proof and vibration-absorptive material.

Description

technical field [0001] The invention belongs to the technical field of rubber materials and advanced composite materials thereof, and relates to a low-density, high-porosity silicone rubber foam material and a preparation method thereof. Background technique [0002] Silicone rubber foam material is a polymer elastic porous material made of silicone rubber base material after foaming in a certain form. It combines the characteristics of silicone rubber and foam material into one, and not only has light weight, heat insulation, and good impact resistance. It also has high and low temperature resistance, electrical insulation, radiation resistance, chemical stability, etc. It is an ideal material for shock absorption, noise reduction, heat insulation, etc., and is widely used in transportation, electronics, chemical industry, military industry and aerospace. and other fields. [0003] The preparation of silicone rubber foam materials usually adopts the method of chemical foam...

Claims

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Application Information

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IPC IPC(8): C08L83/04C08L83/06C08L83/07C08K3/36C08K5/3492C08K13/02C08K3/22C08K3/34C08K5/13C08J9/10C08J9/08
Inventor 宋宏涛傅依备沈鹏赵岩黄玮
Owner SOUTHWEAT UNIV OF SCI & TECH
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