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A kind of bio-based foaming agent foamed silicone rubber material and preparation method thereof

A foaming silicone rubber and foaming agent technology, applied in the field of silicone, can solve the problems of residual gas, uneven foam density, non-environmental protection, etc., achieve good flame retardancy and mechanical resilience, simple preparation process, and easy preparation easy-to-get effect

Active Publication Date: 2021-09-21
浙江天易新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The foaming agent involved in the above foaming method will more or less have many problems in the application process: as the above-mentioned inorganic foaming agent has foamed before the material is vulcanized, it is difficult to balance foaming and vulcanization, and organic foaming Most of the gases released by the agent are ammonia, which is not environmentally friendly, and the products produced are generally flammable, and even some products will have residual gases, toxic substances and color pollution (for example, the by-product of AIBN is toxic tetramethyl Succinonitrile)
In addition, catalyst poisoning, too fast vulcanization time, different cell sizes, and uneven foam density are a series of problems

Method used

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  • A kind of bio-based foaming agent foamed silicone rubber material and preparation method thereof
  • A kind of bio-based foaming agent foamed silicone rubber material and preparation method thereof
  • A kind of bio-based foaming agent foamed silicone rubber material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Add 30g of hydroxyl silicone oil (10pa.s), 9.5g of methyl high hydrogen-containing silicone oil (1.5% hydrogen content), 0.4g of carboxycellulose, and 0.08g of 3-methylbutynol-3, and stir with a dispersing mixer , fully mixed evenly, as component A; add 20g of methyl vinyl silicone oil (60pa.s), 20g of nano-silica and 0.04g of chloroplatinic acid-isopropanol solution with a concentration of 3000ppm, and stir with a dispersing mixer. Mix thoroughly and evenly as component B; mix components A and B with a dispersing mixer at a mass ratio of 1:1 for 120s (stirring speed 500rpm), vacuumize at -0.01Mpa for 30min, after casting, finally put the material in The vulcanization is carried out at 25° C., and the foam vulcanization is complete after 60 minutes, and a foamed silicone rubber material 1 with a bio-based foaming agent is obtained.

[0040] The calculated foam density is 0.32g / cm -3 About 3.8 times the expansion ratio.

Embodiment 2

[0042] Add 22g of hydroxyl silicone oil (20pa.s), 6g of methyl low-hydrogen silicone oil (0.75% hydrogen content), 8g of hydroxyl cellulose, 4g of diallyl maleate, stir with a dispersing mixer, and mix well. As component A: take 20g of vinyl-terminated silicone oil (60pa.s), add 16g of magnesium hydroxide and 4g of chloroplatinic acid-isopropanol solution with a concentration of 3000ppm, stir with a dispersing mixer, mix well, and use it as component B ; Mix components A and B according to the mass ratio of 1:1 with a dispersing mixer for 30s (stirring speed 2500rpm), vacuumize at -0.1Mpa for 5min, after casting, put the material at 150°C for vulcanization, after 5min The foam vulcanization is complete, and a bio-based blowing agent foamed silicone rubber material 2 is obtained.

[0043] The calculated foam density is 0.30g / cm 3 About 4.5 times the expansion ratio.

Embodiment 3

[0045] Mix 22g of hydroxyl silicone oil (10pa.s), 6g of methyl high hydrogen-containing silicone oil (hydrogen content of 1.5%), 8g of chitosan, and 4g of diethyl fumarate, stir them with a dispersing mixer, mix them well, and use them as A Components: Add 20g of hydroxyl silicone oil (20pa.s), 16g of terminal vinyl silicone oil (60pa.s), 4g of aluminum hydroxide and 0.1g of chloroplatinic acid-isopropanol solution with a concentration of 3000ppm, and stir with a dispersing mixer. Mix thoroughly and evenly as component B; mix components A and B with a dispersing mixer at a mass ratio of 1:1 for 40s (stirring rate 2500rpm), vacuumize at -0.06Mpa for 10min, after casting, finally put the material in The vulcanization was carried out at 60° C., and the foam was vulcanized completely after 20 minutes, and a foamed silicone rubber material 3 with a bio-based foaming agent was obtained.

[0046] The calculated foam density is 0.28g / cm 3 About 4.3 times the expansion ratio.

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Abstract

The invention relates to the field of organosilicon. In order to solve the problems existing in the foaming of silicone rubber in the prior art, the present invention proposes a bio-based foaming agent foamed silicone rubber material and a preparation method thereof. A Stir and mix the group of silicone oil, foaming agent and inhibitor evenly to obtain component A, then mix the group B silicone oil, flame retardant and catalyst evenly to obtain component B; mix components A and B in a mass ratio of 1:1 Stir and mix for 30-120s, vacuumize for 5-30min to remove the air bubbles caused by material stirring, after casting, vulcanize at 25-150°C for 5min-60min to obtain a bio-based foaming agent foamed silicone rubber material. The invention has the characteristics of environmental protection, low cost, non-toxicity, etc., and the prepared foam has controllable expansion ratio, good mechanical and flame-retardant properties, fine and uniform cells, white color, and a simple and easy preparation method.

Description

technical field [0001] The invention relates to the field of organic silicon, in particular to a preparation method of a green bio-based foaming agent foaming silicone rubber. Background technique [0002] Silicone foam is a new type of polymer flexible foam material, which consists of silicon-oxygen bonds (Si-O-Si) alternately forming the main chain, and organic groups connected to silicon to form side chains. It is a semi-inorganic and semi-organic foam. type polymer materials. In addition to the excellent high and low temperature resistance and electrical properties of ordinary silicone rubber, silicone foam also has other superior properties: such as small dielectric constant, noise reduction, heat insulation, flame retardant, light weight, packaging and storage stability Good quality, short vulcanization time, etc., can be widely used in the potting of electronic and electrical components and mechanical parts, play the role of moisture-proof, dust-proof, vibration redu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L83/04C08L83/05C08L83/07C08J9/04C08K13/02C08K3/36C08K3/22C08K3/34
CPCC08J9/0061C08J9/0066C08J9/0095C08J9/04C08J2383/04C08J2383/07C08J2483/04C08J2483/05C08J2483/07C08K3/22C08K3/2279C08K3/34C08K3/346C08K3/36C08K13/02C08K2003/2224C08K2003/2227C08K2201/011
Inventor 张国栋曹承飞汤龙程李扬赵丽龚丽秀
Owner 浙江天易新材料有限公司
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