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Silicone rubber with low modulus and high tear strength and method for preparing silicone rubber

A technology of high tear strength and silicone rubber, applied in low modulus high tear strength silicone rubber and its preparation, silicone rubber and its preparation field, can solve the problems of high modulus of silicone rubber and can not meet the use requirements, and achieve High tear strength, enhanced ability to resist external force, low elastic modulus effect

Active Publication Date: 2018-04-27
CHENGDU GUIBAO SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Publication numbers are: CN101157801A and CN106589964A Chinese invention patents, although both provide high tear-resistant silicone rubber, but the silicone rubber modulus is too large to meet the above requirements

Method used

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  • Silicone rubber with low modulus and high tear strength and method for preparing silicone rubber
  • Silicone rubber with low modulus and high tear strength and method for preparing silicone rubber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] 70 parts of methyl vinyl silicone rubber A (vinyl content 0.04%, molecular weight 500,000), 30 parts of methyl vinyl silicone rubber B (0.15%, molecular weight 650,000), 3 parts of hydroxyl silicone oil (viscosity 40mPa.s) , 20 parts of fumed white carbon black (specific surface area 380m 2 / g), 0.5 parts of silane coupling agent, kneaded into a dough in a kneader, and then vacuumed for 2 hours (vacuum-0.08MPa, temperature 120°C). Cool the kneaded silicone rubber to room temperature and let it stand for 24 hours.

[0040] Add 1.5 parts of benzoyl peroxide to the open mill, pass it 6 times, cool the rubber to room temperature, and let it stand for more than 16 hours; then vulcanize it with a flat vulcanizer, the conditions are as follows: temperature 160 ° C, pressure 15 MPa, time 10 minute.

Embodiment 2

[0042] 80 parts of methyl vinyl silicone rubber A (vinyl content 0.15%, molecular weight 650,000), 20 parts of methyl vinyl silicone rubber B (5%, molecular weight 350,000), 5 parts of diphenylsilanediol, gas phase French silica 25 parts (specific surface area 200m 2 / g), 1.0 parts of silane coupling agent, kneaded in a kneader to form a dough, and then vacuumed for 2 hours (vacuum-0.08MPa, temperature 150°C). Cool the kneaded silicone rubber to room temperature and let it stand for 24 hours.

[0043] Add 1.5 parts of benzoyl peroxide to the open mill, pass it 6 times, cool the rubber to room temperature, and let it stand for more than 16 hours; then vulcanize it with a flat vulcanizer, the conditions are as follows: temperature 160 ° C, pressure 15 MPa, time 10 minute.

Embodiment 3

[0045] 90 parts of methyl vinyl silicone rubber A (vinyl content 0.04%, molecular weight 650,000), 10 parts of methyl vinyl silicone rubber B (5%, molecular weight 600,000), 5 parts of hydroxyl silicone oil (viscosity 30mPa.s) , 30 parts of fumed silica (specific surface area 150m 2 / g), 1.5 parts of silane coupling agent, kneaded in a kneader to form a mass, and then vacuumed for 2 hours (vacuum-0.08MPa, temperature 150°C). Cool the kneaded silicone rubber to room temperature and let it stand for 24 hours.

[0046] Add 0.5 parts of 2,4-dichlorobenzoyl peroxide (double 2,4) to the open mill, pass it 6 times, cool the rubber to room temperature, and place it for more than 16 hours; then vulcanize it with a flat vulcanizer, and The conditions are as follows: temperature 160° C., pressure 15 MPa, and time 10 minutes.

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Abstract

The invention discloses silicone rubber with low modulus and high tear strength. The silicone rubber comprises, by weight, 70-95 parts of methyl vinyl silicone rubber A, 5-30 parts of methyl vinyl silicone rubber B, 15-30 parts of gas-phase white carbon black, 0.5-2 parts of silane coupling agents, 3-7 parts of structural control agents and 0.1-1.5 parts of vulcanizing agents. The invention further provides a method for preparing silicone rubber sealing strips with low modulus and high tear strength. The silicone rubber and the method have the advantage that the silicone rubber is high in tearstrength and elongation and low in elastic modulus.

Description

technical field [0001] The invention relates to a silicone rubber and a preparation method thereof, in particular to a low-modulus high-tear strength silicone rubber and a preparation method thereof, belonging to the field of high-temperature vulcanized silicone rubber material manufacturing. Background technique [0002] Exterior Insulation and Finishing Systems (EIFS) are multi-layer exterior wall systems that prevent moisture from penetrating interior walls and can be used in commercial buildings and residential buildings. EIFS is a light-weight, environment-friendly non-load-bearing peripheral building wall system that integrates energy saving, heat preservation, sound insulation and decorative effects. [0003] In the actual application process, due to the structural form of the building, climatic conditions, system materials, construction technology, construction management and other reasons, even the most mature thermal insulation system also has some quality problems...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/07C08L83/04C08K3/36C08K5/5425C08K5/14C08K5/5419C08K5/5445
CPCC08K2201/006C08L83/04C08L2205/025C08L2205/03C08L2312/00C08K3/36C08K5/5425C08K5/14C08K5/5419C08K5/544
Inventor 罗晓锋黄伟黄强王有治
Owner CHENGDU GUIBAO SCI & TECH
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