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Low-hardness high-tear-resistance self-lubricating addition type liquid silicone rubber, preparation method and application thereof

A technology of silicone rubber and silicone rubber composition, applied in the field of silicone rubber, can solve the problems of high hardness, inability to meet the requirements of cyclic plugging and use of automobile plug-in parts, damage and the like

Active Publication Date: 2020-06-19
JIANGXI BLUESTAR XINGHUO SILICONE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Patents CN100549098C and CN104479365B both disclose a self-lubricating silicone rubber. The composition has good surface lubricity, but the hardness is high, and it is easy to cause damage when the rigid metal head passes through, and the ability to resist damage is poor
[0006] Patent CN10266729B discloses a vulcanizable liquid silicone rubber composition and sealing element for forming sealing elements. When the hardness is 16-22Sh.A, its tear strength is only 18KN / m, which cannot achieve high tear resistance , can not meet the requirements of the automotive plug-in parts for more than a thousand cycles of plugging and unplugging

Method used

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  • Low-hardness high-tear-resistance self-lubricating addition type liquid silicone rubber, preparation method and application thereof
  • Low-hardness high-tear-resistance self-lubricating addition type liquid silicone rubber, preparation method and application thereof
  • Low-hardness high-tear-resistance self-lubricating addition type liquid silicone rubber, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0078] In a kneader or a planetary mixer, 37 parts by weight of vinyl-terminated polysiloxane with a viscosity of 100,000 mPa·s and an alkenyl content of 0.026 mmol / g, and 7.8 parts of vinyl polysiloxane with a viscosity of 60,000 mPa·s and an alkenyl content of 0.030 The vinyl-terminated polysiloxane of mmol / g, the specific surface area of ​​25 parts BET is 300m 2 / g of fumed silica and 7.05 parts of hexamethyldisilazane, 0.15 parts of tetramethyldivinylsilazane and 6.5 parts of deionized water were fully mixed under the protection of an inert atmosphere at 80°C for 1 ~ 2 hours, then heat up to 130 ~ 150 ° C and start vacuuming for 2 ~ 4 hours, keep the temperature at 150 ~ 170 ° C during vacuuming, then cool down to 110 ~ 140 ° C, add 16.5 parts of viscosity 20000mPa·s alkenyl content is 0.035mmol / g vinyl-terminated polysiloxane, and stir evenly to obtain liquid silicone rubber base rubber 1.

preparation example 2

[0080] In a kneader or a planetary mixer, 40 parts by weight of vinyl-terminated polysiloxane with a viscosity of 60,000mPa·s and an alkenyl content of 0.030mmol / g, and 2.5 parts of vinyl polysiloxane with a viscosity of 200,000mPa·s and an alkenyl content of 0.035 The specific surface area of ​​mmol / g of vinyl-terminated polysiloxane and 27.5 parts of BET is 400m 2 / g of fumed silica and 8 parts of hexamethyldisilazane, 0.5 parts of tetramethyldivinylsilazane and 4.5 parts of deionized water were fully mixed under the protection of an inert atmosphere at 80°C for 1 ~ 2 hours, then heat up to 130 ~ 150 ° C and start vacuuming for 2 ~ 4 hours, keep the temperature at 150 ~ 170 ° C during vacuuming, then cool down to 110 ~ 140 ° C, add 17 parts of viscosity 60000mPa·s alkenyl content is 0.030mmol / g vinyl-terminated polysiloxane, stirred evenly to obtain liquid silicone rubber base rubber 2.

[0081] Example Preparation of liquid silicone rubber

Embodiment 1

[0083] Preparation and vulcanization of component AB: 85 parts of the above base rubber 1, 4.5 parts of vinyl-terminated polysiloxane with a viscosity of 3500mPa·s and an alkenyl content of 0.08mmol / g, 4 parts of a vinyl-terminated polysiloxane with a viscosity of 1000mPa·s, Side chain vinyl polysiloxane with a group content of 0.12mmol / g, 0.5 parts of vinyl polysiloxane with a viscosity of 400mPa·s and an alkenyl content of 0.9mmol / g in both terminal and side chains, 0.012 parts of cal Stir-type platinum catalyst, 6 parts of methylphenylpolysiloxane with a viscosity of 120mPa s and a refractive index of 1.49, stirred and dispersed in a planetary mixer for 30-40min, mixed evenly and then vacuumed and defoamed to obtain a self-lubricating low-pressure variable liquid Silicone rubber component A.

[0084] 85 parts of the above-mentioned gum base 1, 1.5 parts of vinyl-terminated polysiloxane with a viscosity of 3500 mPa·s and an alkenyl content of 0.08 mmol / g, and 4 parts of a vi...

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Abstract

The invention discloses low-hardness high-tear-resistance self-lubricating addition type liquid silicone rubber, a preparation method and application thereof. The silicone rubber composition comprisesa component A and a component B, wherein the component A is prepared from the following raw materials in parts by weight: 70 to 100 parts of a base rubber, 0.004 to 0.4 part of a Si-H addition catalyst and 2 to 22 parts of alkenyl-containing polysiloxane, the component B is prepared from the following raw materials in parts by weight: 70 to 100 parts of a base rubber, 2 to 10 parts of alkenyl-containing polysiloxane, 1 to 6 parts of hydrogen-containing silicone oil and 0.4 to 4 parts of a hydrogen-containing silicone resin, and the silicone rubber obtained after vulcanization molding has thehardness of 17-22 Sh.A, the tearing strength of larger than 35 KN.m<-1> and the tensile strength of larger than 8 Mpa. According to the high-tear-resistance self-lubricating liquid silicone rubber provided by the invention, the tear resistance of the liquid silicone rubber within the hardness range of 17-21 Sh.A is improved to 35 KN.m<-1>, and the high-tear-resistance self-lubricating liquid silicone rubber can be applied to the field of high-end automobile plug pieces.

Description

technical field [0001] The invention belongs to the field of silicone rubber, and in particular relates to a low-hardness, high-tear-resistant, self-lubricating addition type liquid silicone rubber, a preparation method and application thereof. Background technique [0002] Liquid silicone rubber has good high and low temperature resistance, small performance change in a wide temperature range, ozone resistance, weather resistance, electrical insulation, flame retardancy and many other excellent properties. At the same time, it has high process automation, high production efficiency, and environmental protection. By-products, the field of application continues to expand. However, one of the characteristics of liquid silicone rubber is that it has a large friction coefficient and poor wear resistance, which limits its application in some low-friction demand fields. [0003] After the self-lubricating silicone rubber material is vulcanized and molded, many fine oil droplets w...

Claims

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Application Information

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IPC IPC(8): C08L83/07C08L83/05C08L83/04
CPCC08L83/04C08L2205/035C08L2205/025
Inventor 雷丽娟郭鹏黎哲辉唐强涂广水
Owner JIANGXI BLUESTAR XINGHUO SILICONE CO LTD
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