Continuous silicon rubber foam plate with low compression stress relaxation and preparation method of continuous silicon rubber foam plate

A technology of stress relaxation and silicone rubber, which is applied in the field of low compressive stress relaxation silicone rubber foam continuous sheet and its preparation, can solve the problem that the compressive stress relaxation performance of foam material cannot meet the requirements, the production of silicone rubber foam continuous sheet cannot be realized, and the production of silicone rubber foam continuous sheet cannot be obtained. Silicone rubber foam continuous sheet and other problems, to achieve the effect of low compressive stress relaxation, high production efficiency, uniform and small cells

Inactive Publication Date: 2012-09-26
XIHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing preparation and processing of silicone rubber foam materials mainly focus on the molding method or extrusion-hot air vulcanization foaming method. length continuous sheet), and the comp

Method used

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  • Continuous silicon rubber foam plate with low compression stress relaxation and preparation method of continuous silicon rubber foam plate
  • Continuous silicon rubber foam plate with low compression stress relaxation and preparation method of continuous silicon rubber foam plate

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0024] Example 1

[0025] Add methyl vinyl silicone rubber, fumed silica, AK foaming agent, benzoyl peroxide (BPO) to the internal mixer according to the weight ratio of each component in the formula in Table 1, and mix at room temperature After 30 minutes, add the evenly mixed rubber compound into the silicone rubber extruder, and obtain a flat rubber blank with the required width and thickness through the die. Finally, the flat continuous rubber blank is passed into the salt bath vulcanization tank for vulcanization and foaming, the salt bath temperature is controlled at 140-145°C, and the vulcanization and foaming time is 3 to 5 minutes.

Example Embodiment

[0026] Example 2

[0027] According to the weight ratio of each component in the formula in Table 1, add methyl vinyl silicone rubber, fumed silica, AC blowing agent, 2,5-dimethyl-2,5-di to the internal mixer in sequence Tert-butylperoxy hexane (DBPMH), mixed at room temperature for 30 minutes, then add the uniformly mixed rubber to the silicone rubber extruder, and obtain the flat rubber blank with the required width and thickness through the die . Finally, the flat continuous rubber embryo is passed into the salt bath vulcanization tank for vulcanization and foaming. The temperature of the salt bath is controlled at 173-178°C, and the vulcanization and foaming time is 3 to 5 minutes.

Example

[0028] Examples 3-7

[0029] According to the weight ratio of each component in the formula in Table 1, add methyl vinyl silicone rubber, fumed silica, H blowing agent, dicumyl peroxide (DCP) and crosslinking aid to the internal mixer. Mix for 30 minutes at room temperature, then add the uniformly mixed rubber to the silicone rubber extruder, and obtain a flat rubber blank with the required width and thickness through the die. Finally, the flat continuous rubber blank is passed into the salt bath vulcanization tank for vulcanization and foaming, the salt bath temperature is controlled at 160-165°C, and the vulcanization and foaming time is 3 to 5 minutes.

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Abstract

The invention provides a continuous silicon rubber foam plate with low compression stress relaxation and a preparation method of the continuous silicon rubber foam plate. The problems that production of the continuous silicon rubber foam plate cannot be realized by using the traditional die pressing method and the continuous silicon rubber foam plate with a smooth surface cannot be obtained by using an extrusion-hot air vulcanizing and foaming method are solved. The preparation method of the continuous silicon rubber foam plate is characterized by comprising the following steps of: adding 100 parts of silicon rubber, 1-3 parts of vulcanization systems, 2-8 parts of foaming systems, 10-50 parts of reinforcing agent and 1-5 parts of structural control agent into an internal mixer to uniformly mix at room temperature; then, adding a rubber compound into a silicon rubber extruder to obtain a flat-like rubber blank with required width and thickness through a die; and finally, introducing the flat-like continuous rubber blank into a salt bath vulcanization tank to vulcanize and foam, wherein the salt bath temperature is controlled at 135-180 DEG C, and the vulcanizing and foaming time is controlled within 3-5min. The continuous silicon rubber foam plate has the characteristics of high production efficiency, uniform heating and vulcanizing temperature, good surface level, uniform and small cells and low compression stress relaxation so as to have huge application prospect when being used as sealing, sound insulating, heat insulating, locating and damping materials in special severe environments such as transportation, petrochemical industry, electronic industry and aerospace.

Description

technical field [0001] The invention relates to a low compressive stress relaxation silicone rubber foam continuous plate and a preparation method thereof, belonging to the field of polymer material processing. Background technique [0002] Porous thermally vulcanized silicone rubber foam material is a porous viscoelastic polymer material made of silicone rubber after foaming. It not only has the light weight, high specific strength, compressibility, sound insulation and insulation properties of conventional polymer foam materials It has good thermal performance, high energy impact resistance and vibration damping performance, and also has excellent high and low temperature resistance performance of silicone rubber. It is widely used in the fields of transportation, petrochemical industry, electronics industry and aerospace and other fields for sealing, sound insulation, Heat insulation, positioning and vibration reduction, etc. Among them, the silicone rubber foam sheet (sl...

Claims

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Application Information

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IPC IPC(8): C08L83/04C08L83/07C08J9/04C08J9/10C08K13/02B29C35/06
Inventor 魏刚孙彩亮李茜余燕
Owner XIHUA UNIV
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