Preparation method for anti-aging silicone rubber used for compression seal products

A compression sealing and anti-aging technology, applied in the field of silicone rubber, can solve the problems of limited application of silicone rubber, low thermal strength of silicone rubber, low strength of raw silicone rubber, etc., to achieve excellent UV resistance and acid corrosion resistance, excellent mechanical performance, the effect of excellent electrical properties

Inactive Publication Date: 2018-06-01
天长市荣盛有机硅科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, the strength of raw silicone rubber itself is very low, and it is necessary to add a reinforcing agent during processing to increase its strength. The price is expensive, and the heat resistance of the existing silicone rubber is low, and the aging is serious after long-term use, which limits the application of silicone rubber in the field of compression sealing products

Method used

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  • Preparation method for anti-aging silicone rubber used for compression seal products

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A preparation method of aging-resistant silicone rubber for compression sealing products, comprising the steps of:

[0023] S1. Stir 40kg of spherical alumina particles, 4kg of monomethoxypolyethylene glycol, and 80kg of methylene chloride, add 18kg of hydroxypropyl methacrylate, and 1kg of ethylene oxide and continue stirring for 20 minutes at a stirring speed of 1800r / min. Add 4 kg of hydrochloric acid with a concentration of 1.5 mol / L and 4 kg of polymerization inhibitor into a sealed reaction kettle, raise the temperature to 85°C under nitrogen protection, stir for 8 hours, let stand for 4 hours, cool, and wash to obtain the first material;

[0024] S2. Stir 90kg of methyl vinyl silicone rubber, 10kg of nitrile silicone rubber, 100kg of heavy calcium carbonate, 30kg of the first material, and 8kg of structure control agent for 10 minutes, adjust the temperature to 180°C, and stand in vacuum for 30 minutes, with a vacuum degree of 0.13kPa , to obtain the second mater...

Embodiment 2

[0027] A preparation method of aging-resistant silicone rubber for compression sealing products, comprising the steps of:

[0028] S1. Stir 80kg spherical alumina particles, 2kg monomethoxypolyethylene glycol, and 120kg dichloromethane, add 10kg hydroxypropyl methacrylate, and 2kg ethylene oxide and continue stirring for 10 minutes at a stirring speed of 2100r / min. Add 2 kg of hydrochloric acid with a concentration of 2.5 mol / L and 2 kg of polymerization inhibitor into a sealed reaction kettle, raise the temperature to 95°C under nitrogen protection, stir for 4 hours, let stand for 8 hours, cool, and wash to obtain the first material;

[0029] Among the spherical alumina particles, particles with a particle diameter of 20-40 μm account for 50 wt%, particles with a particle diameter of 60-100 μm account for 20 wt%, and the remaining particles have a particle diameter of 200-300 μm.

[0030] S2. Stir 70kg of methyl vinyl silicone rubber, 20kg of nitrile silicone rubber, 60kg of ...

Embodiment 3

[0033] A preparation method of aging-resistant silicone rubber for compression sealing products, comprising the steps of:

[0034] S1. Stir 50kg of spherical alumina particles, 3.5kg of monomethoxypolyethylene glycol, and 90kg of dichloromethane, add 16kg of hydroxypropyl methacrylate, and 1.2kg of ethylene oxide and continue stirring for 18 minutes at a stirring speed of 1900r / min, add 3.5 kg of hydrochloric acid with a concentration of 1.8 mol / L and 3.5 kg of polymerization inhibitor into a sealed reaction kettle, heat up to 88°C under nitrogen protection, stir for 7 hours, let stand for 5 hours, cool, and wash to obtain the first material;

[0035] Among the spherical alumina particles, particles with a particle size of 20-40 μm account for 30 wt%, particles with a particle size of 60-100 μm account for 30 wt%, and the remaining particles have a particle size of 200-300 μm.

[0036] S2. Stir 85kg of methyl vinyl silicone rubber, 12kg of nitrile silicone rubber, 90kg of hea...

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Abstract

The invention discloses a preparation method for anti-aging silicone rubber used for compression seal products. The method comprises the following steps: stirring spherical aluminum oxide particles, monomethoxypolyethylene glycol and dichloromethane, adding hydroxypropyl methacrylate and ethylene oxide, continuing stirring, adding hydrochloric acid and a polymerization inhibitor, sending the obtained material to a seal reaction kettle, performing heating and performing stirring under the protection of nitrogen gas, allowing the stirred material to stand, performing cooling, and performing washing to obtain a first material; stirring methyl vinyl silicone rubber, nitrile silicone rubber, heavy calcium carbonate, the first material and a structure controlling agent, adjusting the temperature, and allowing the material to stand under vacuum, so as to obtain a second material; and heating the second material, allowing the heated second material to stand, adding cyclohexane peroxide, performing mill run, performing primary vulcanization, and performing secondary vulcanization to obtain the anti-aging silicone rubber used for the compression seal products. The obtained silicone rubber provided by the invention has excellent mechanical properties and electrical properties, excellent ultraviolet resistance and acid corrosion resistance, and good heat resistance, wherein the thermal conductivity can reach 5.8W/(m*K).

Description

technical field [0001] The invention relates to the technical field of silicone rubber, in particular to a preparation method of aging-resistant silicone rubber for compression sealing products. Background technique [0002] Silicone rubber has excellent high and low temperature resistance, weather resistance, water repellency, electrical insulation and other unique properties and a very wide operating temperature range. Silicone rubber has become an indispensable and important material in modern high-tech fields including aerospace, aviation, navigation, national defense, electronic appliances, transportation, medical and health, and human daily life. [0003] However, the strength of raw silicone rubber itself is very low, and it is necessary to add a reinforcing agent during processing to increase its strength. The price is expensive, and the existing silicone rubber has low heat-resistant strength and serious aging after long-term use, which limits the application of si...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/05C08L83/08C08L71/02C08K9/10C08K7/18C08K3/22C09K5/14
CPCC08K2003/2227C08K2201/003C08L83/04C08L2201/08C08L2205/03C09K5/14C08L83/08C08L71/02C08K9/10C08K7/18C08K3/22
Inventor 张新华李保生
Owner 天长市荣盛有机硅科技有限公司
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