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Silicone rubber microporous foam material adopting mixed cellular structure and preparation method of silicone rubber microporous foam material

A foam material and silicone rubber technology, which is applied in the field of silicone rubber microcellular foam materials of mixed cell structure and their preparation, can solve the problem of poor tensile strength of silicone rubber foam materials, complicated intermediate processes, and high dosage of pore-forming agents. problems, to achieve the effects of excellent comprehensive performance, high production efficiency and convenient control

Active Publication Date: 2015-07-22
INST OF NUCLEAR PHYSICS & CHEM CHINA ACADEMY OF
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] 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, takes a long time, and needs to be dissolved in boiling water to form pores, and the tensile strength of the prepared silicone rubber foam material is relatively poor.

Method used

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  • Silicone rubber microporous foam material adopting mixed cellular structure and preparation method of silicone rubber microporous foam material
  • Silicone rubber microporous foam material adopting mixed cellular structure and preparation method of silicone rubber microporous foam material
  • Silicone rubber microporous foam material adopting mixed cellular structure and preparation method of silicone rubber microporous foam material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Step 1. Take 20 g of methyl vinyl silicone rubber with a vinyl content of 0.05 mol%, add it to a two-roll mill, and masticate it at room temperature for 5 minutes, then add 8.75 g of fumed silica and 0.5 mL of hydroxy silicone oil, Mix for 5 minutes, add 25g of urea, 1g of triallyl isocyanurate, continue mixing for 10 minutes to obtain a rubber compound, then store the rubber compound at room temperature for 24 hours, and then store it at room temperature Re-milling for 10 minutes, and then molding 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 200r.min - 1 ; The die used in the molding is stainless steel;

[0043] 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 100Gy.min -1 Carry out radiation cross-linking at the position where the absorbed dose is 30kGy, ...

Embodiment 2

[0047] Step 1: Take 25g of methyl vinyl silicone rubber with a vinyl content of 0.1mol% and put it into a two-roll mill, masticate it at room temperature for 5 minutes, then add 3.8g of precipitated silica and 0.5mL of hydroxy silicone oil, Mix for 5 minutes, then add 20g urea, 1g triallyl cyanurate, continue mixing for 10 minutes to obtain a rubber compound, then store the rubber compound statically at room temperature for 24 hours, and then return to the compound at room temperature Refined for 10 minutes, then molded the finished compound into a sheet or block on a tablet press; the rotary drum speed of the two-roll mill was set at 300r.min -1 ; The die used in the molding is stainless steel;

[0048] 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 107Gy.min -1 Carry out radiation cross-linking at the position where the absorbed dose is 45kGy, so that the rubber...

Embodiment 3

[0051] Step 1: Take 50g of methylvinyl silicone rubber with a vinyl content of 0.12mol% and put it into a two-roll mill, masticate it at room temperature for 5 minutes, then add 15g of precipitated silica, 1mL of hydroxy silicone oil, and knead 5 minutes, then add 35g urea, 2g trimethylolpropane trimethacrylate, continue to knead for 10 minutes, obtain sizing material, then said sizing material is statically stored at room temperature for 24 hours, and then returns to Refined for 10 minutes, then molded the finished compound into a sheet or block on a tablet press; the rotary drum speed of the two-roll mill was set at 400r.min -1 ; The die used in the molding is stainless steel;

[0052] 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 110Gy.min -1 Carry out radiation cross-linking at the position where the absorbed dose is 60kGy, so that the rubber can be c...

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Abstract

The invention discloses a silicone rubber microporous foam material adopting a mixed cellular structure and a preparation method of the silicone rubber microporous foam material. The preparation method is characterized by comprising the following steps: mixing 100 parts of a silicone rubber base material, 15-45 parts of a reinforcing agent, 2-3 parts of a structure controlling agent, 60-125 parts of a pore-forming agent and 3-5 parts of a radiosensitizer, forming, radiating through gamma rays so as to enable the formed product to be crosslinked, wherein the radiation absorbed dose is 30-70 kGy, performing solventing-out section by section to form holes, and drying, so as to obtain the silicone rubber microporous foam material with excellent performance. According to the invention, the method that radiation crosslinking cooperates with solventing-out hole forming is adopted, so that crosslinking is uniform, control is convenient, energy conservation and environment friendliness are realized, the process is simple, reproducibility is good, and production efficiency is high; the prepared silicone rubber microporous foam material adopts the mixed cellular structure, and is excellent in comprehensive performance, small in hole, pure white in color, soft in texture, proper in crosslinking density and gel content, high in tensile strength and elongation at break and low in permanent tensile deformation and compression deformation.

Description

technical field [0001] The invention belongs to the field of polymer materials, and relates to a silicone rubber microporous foam material with a mixed cell structure 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, 2014, 3...

Claims

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Application Information

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IPC IPC(8): C08L83/07C08L83/06C08K3/36C08K5/3492C08K5/103C08J9/26C08J3/28C08J3/24
Inventor 宋宏涛陈洪兵杨天丽黄玮安友吴文昊曾凡松李闯
Owner INST OF NUCLEAR PHYSICS & CHEM CHINA ACADEMY OF
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