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Low density silicone rubber and preparation method thereof

A silicone rubber, low-density technology, applied in the field of silicone rubber, can solve the problems affecting the pore structure and density of foam materials, unstable preparation process, difficulty in matching vulcanization rate and foaming rate, etc., to overcome difficult molding control, The preparation process is simple and easy, and the effect of excellent elasticity

Active Publication Date: 2018-02-23
HANGZHOU RIYAO TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above patents are difficult to solve the problem of matching vulcanization rate and foaming rate, which leads to unstable preparation process and directly affects the pore structure and density of foam materials.

Method used

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  • Low density silicone rubber and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 3.7Kg of octamethylcyclotetrasiloxane (D 4 ) and 8.6g of tetravinyltetramethylcyclotetrasiloxane (D 4 vi ), add 0.76g of inorganic base tetramethylammonium hydroxide to carry out ring-opening reaction, after equilibrating reaction at 105°C for 3.0 hours, add 29.6g of water degradation reaction for 1.0 hour to carry out water-sealing, and then rapidly raise the temperature of the system to 150°C for half hours, decompose it to remove the catalytic activity, and then remove the low boilers under the condition of vacuum degree -0.098Mpa to obtain 3.15Kg of hydroxyl-terminated side chain vinyl polysiloxane with a viscosity of 1.4Pa.s.

[0037] Component A: 100 parts of the above self-made hydroxyl-terminated side chain vinyl polysiloxane with a viscosity of 1.4Pa.s, 40 parts of the treated precipitated white carbon black and fumed white carbon black according to the weight of 3:2 Add it to a high-speed mixer and stir for 2 hours. After the dispersion is uniform, add 0.7 p...

Embodiment 2

[0041] 2.2Kg of dimethylsiloxane mixed rings (DMC) and 25.8g of tetravinyltetramethylcyclotetrasiloxane (DMC) 4 vi ), add 0.58g of inorganic base tetramethylammonium hydroxide to carry out ring-opening reaction, after 2.5 hours of equilibrium reaction at 105°C, add 17.2g of water degradation reaction for 1.0 hour to carry out water sealing, and then quickly heat up the system to 150°C for half hours, decompose it to remove the catalytic activity, and then remove the low boilers under the condition of vacuum degree -0.098Mpa to obtain 1.87Kg of hydroxyl-terminated side chain vinyl polysiloxane with a viscosity of 1.6Pa.s.

[0042] Component A: Add 100 parts of the above self-made hydroxyl-terminated side chain vinyl polysiloxane with a viscosity of 1.6Pa.s and 70 parts of 1250-mesh silicon micropowder to a high-speed mixer and stir for 2.5 hours. After the dispersion is uniform, add 0.5 parts of platinum content 5000ppm vinyl platinum complex solution, stirred at room temperat...

Embodiment 3

[0046] 2.9Kg of octamethylcyclotetrasiloxane (D 4 ) and 17.8g of tetravinyltetramethylcyclotetrasiloxane (D 4 vi ), add 1.18g of inorganic base tetramethylammonium hydroxide to carry out ring-opening reaction, after 2.8 hours of equilibrium reaction at 105°C, add 18.1g of water degradation reaction for 1.0 hour to carry out water sealing, and then rapidly heat up the system to 150°C for half hours, decompose it to remove the catalytic activity, and then remove the low boilers under the condition of vacuum degree -0.098Mpa to obtain 2.41Kg of hydroxyl-terminated side chain vinyl polysiloxane with a viscosity of 3.9Pa.s.

[0047] Component A: Add 100 parts of the above self-made hydroxyl-terminated side chain vinyl polysiloxane with a viscosity of 3.9Pa.s and 60 parts of 1250 mesh silicon micropowder to a high-speed mixer and stir for 2.5 hours. After the dispersion is uniform, add 0.4 parts of platinum content 8000ppm vinyl platinum complex solution, stirred at room temperatu...

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Abstract

The invention relates to the field of silicone rubber, in order to solve the matching problem of sulfuration rate and foaming rate in the prior art, and provides low density silicone rubber and a preparation method thereof. At a room temperature, a component A and a component B are mixed according to a ratio 1:1, the materials are permitted to stand, foaming and solidification are carried out for5-20 minutes, and the product is obtained. The low density silicone rubber has the characteristics of low density, uniform bubble apertures, excellent elasticity, and low cost.

Description

technical field [0001] The invention relates to the field of silicone rubber, in particular to a low-density multi-void silicone rubber and a preparation method thereof. Background technique [0002] Foamed silicone rubber is widely used in transportation, petrochemical, household appliances, office supplies, machinery, ships and other fields. The main reason is that it has its special excellent performance, mainly in heat resistance, cold resistance, electrical insulation and flame retardancy, and it also has the inherent elasticity of sponge. [0003] Foamed silicone rubber can be divided into two types according to the foaming and curing method: one is high-temperature vulcanized foamed silicone rubber, and the other is liquid room temperature vulcanized foamed silicone rubber. The latter is a foaming material that contains hydrogen silicone oil, reinforcing fillers and various additives in 107 glue or vinyl silicone oil, and is prepared by hydrosilylation and dehydrogen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/07C08L83/05C08L83/04C08K3/36C08J9/04
CPCC08J9/04C08J2383/04C08J2483/04C08K2201/014C08L83/04C08L2203/14C08L2205/025C08L2205/03C08K3/36
Inventor 张国栋汤龙程邬继荣赵丽王华兰胡应乾
Owner HANGZHOU RIYAO TECH
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