High-temperature-resistant silicone rubber foam material and preparation method thereof

A foam material and high-temperature-resistant technology, which is applied in the field of high-temperature-resistant silicone rubber foam material and its preparation, can solve the problems of poor tensile strength of silicone rubber foam material, high amount of pore-forming agent, complicated intermediate process, etc., and achieve excellent The effect of comprehensive performance, low weight loss and longitudinal deformation, and high production efficiency

Active Publication Date: 2015-07-01
INST OF NUCLEAR PHYSICS & CHEM CHINA ACADEMY OF
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In the above-mentioned patent documents, the amount of pore-forming agent used in the preparation process is relatively high, the intermediate process is complicated, and it takes a long time, and it needs to be dissolved in boiling water to form pores. At the same time, the tensile strength of the prepared silicone rubber foam material is poor, and The tensile strength of the foam material prepared in the patent document CN1884378A "An open-cell silicone rubber foam material and its preparation method and application" is 0.55-0.76MPa, which is lower than that of the high-temperature-resistant foam material prepared by the present invention after heat aging tensile strength

Method used

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  • High-temperature-resistant silicone rubber foam material and preparation method thereof
  • High-temperature-resistant silicone rubber foam material and preparation method thereof
  • High-temperature-resistant silicone rubber foam material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Step 1. Take 20g of methyl vinyl silicone rubber and add it to the double-roller open mill, masticate at room temperature for 5 minutes, then add 5g of fumed silica, 0.5mL of hydroxyl silicone oil, mix for 5 minutes, and then add 30g of urea , Triallyl cyanurate 1g, continue mixing for 10 minutes to obtain a rubber compound, then store the rubber compound statically at room temperature for 48 hours, then return the rubber compound for 10 minutes at room temperature, and then The rubber material that has been re-milled 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 ; The die used in the molding is stainless steel;

[0041] Step 2. After the formed sheet or block is plastic-sealed, place it in the air at room temperature 60 The absorbed dose rate in the Coγ single-plate radiation field is 130Gy.min -1 Carry out radiation cross-linking at the position where the absorbed dose is 50kGy, so that the ru...

Embodiment 2

[0044] Step 1. Take 50g of methyl vinyl silicone rubber and add it to the double-roller open mill, masticate for 5 minutes at room temperature, then add 15g of precipitated silica, 1mL of hydroxyl silicone oil, and 0.1g of phthalocyanine green, and mix for 5 minutes , then add 35g of urea and 2g of triallyl cyanurate, continue mixing for 10 minutes to obtain a rubber compound, then store the rubber compound at room temperature for 48 hours, and then re-mill the rubber compound at room temperature In 10 minutes, at room temperature, the sizing material that has been re-milled is molded into a sheet or block on a tablet press; the rotating drum speed of the two-roll mill is set to 300r.min -1 ; The mold used in the molding is polyethylene;

[0045] Step 2. After the formed sheet or block is plastic-sealed, place it in the air at room temperature 60 Absorbed dose rate in Coγ single plate radiation field is 160Gy.min -1 Carry out radiation cross-linking at the position where the...

Embodiment 3

[0048] Step 1. Take 100g of methyl vinyl silicone rubber and add it to a two-roller open mill, masticate for 5 minutes at room temperature, then add 20g of fumed silica and 3mL of hydroxyl silicone oil, mix for 10 minutes, then add 120g of urea, Triallyl cyanurate 4.5g, continue to knead for 10 minutes, obtain sizing material, then said sizing material is statically stored at room temperature for 72 hours, then at room temperature the sizing material is returned to kneading for 15 minutes, at room temperature Next, mold the rubber material that has been re-milled into a sheet or block on a tablet press; the rotating drum speed of the two-roll mill is set to 400r.min -1 ; The mold used in the molding is polyethylene;

[0049] Step 2. After the formed sheet or block is plastic-sealed, place it in the air at room temperature 60 Absorbed dose rate in Coγ single-plate radiation field is 151Gy.min -1 Carry out radiation cross-linking at the position where the absorbed dose is 30kG...

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Abstract

The invention discloses a high-temperature-resistant silicone rubber foam material and a preparation method thereof. The preparation method of the high-temperature-resistant silicone rubber foam material is characterized by comprising the following steps: mixing 100 parts of silicone rubber base stock, 20-35 parts of a reinforcing agent, 2-3 parts of a structure controlling agent, 0-0.2 part of colour master batch, 60-150 parts of a pore-forming agent and 4-5 parts of a radiation sensitizer, moulding, crosslinking through gamma ray radiation, forming pores through subsection dissolving-out, and drying, so that the silicone rubber foam material which is resistant to high temperature of 250 DEG C and still maintains excellent performance after equivalent time of 20000 hours can be obtained. The preparation method of the high-temperature-resistant silicone rubber foam material has the advantages that radiation crosslinking and dissolving-out pore forming are combined, so that crosslinking is uniform, control is easy, energy conservation and environmental protection are realized, a technology is concise, reproducibility is good, and production efficiency is high; the high-temperature-resistant silicone rubber foam material still maintains high tensile strength, high weight loss, low longitudinal deformation and low surface hardness after the equivalent time of 20000 hours at the temperature of 250 DEG C, permanent compressive deformation is slightly increased, the high-temperature-resistant silicone rubber foam material does not become brittle or hard, and the high-temperature-resistant silicone rubber foam material can serve as filling and positioning, sealing cushion, cable insulation as well as buffer and vibration-absorptive materials or parts which are used in high-temperature environment.

Description

technical field [0001] The invention belongs to the field of advanced polymer materials, and in particular relates to a high-temperature-resistant 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, not only has high / low temperature resistance, electrical insulation performance, Radiation resistance, chemical stability, etc., also has high flexibility, high elasticity, and excellent high-energy impact resistance and sound insulation performance (Xing Songmin, Wang Yilu. Silicone synthesis process and product application. Chemical Industry Press, Beijing. 2000 .Wu Wenhao, Song Hongtao, Huang Wei, et al. Preliminary Theoretical Exploration of the Radiation Stability of Silicone Rubber Foam Materials. Acta Molecular Science...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/07C08L83/06C08K3/36C08K5/3492C08J9/28C08J3/28C08J3/24
Inventor 宋宏涛安友朱莎李宗军李晓燕曾凡松黄玮杨天丽
Owner INST OF NUCLEAR PHYSICS & CHEM CHINA ACADEMY OF
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