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A kind of low hardness and high tear resistance self-lubricating addition type liquid silicone rubber and its preparation method and application

A technology of silicone rubber and silicone rubber composition, applied in the field of silicone rubber, which can solve the problems of high hardness, failure to meet the requirements for cyclic plugging and unplugging of automobile plug-in parts, and damage, etc.

Active Publication Date: 2021-12-31
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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  • A kind of low hardness and high tear resistance self-lubricating addition type liquid silicone rubber and its preparation method and application
  • A kind of low hardness and high tear resistance self-lubricating addition type liquid silicone rubber and its preparation method and application
  • A kind of low hardness and high tear resistance self-lubricating addition type liquid silicone rubber and its preparation method and application

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 a low-hardness, high-tear-resistant self-lubricating addition type liquid silicone rubber, a preparation method and application thereof. The silicone rubber composition comprises A component and B component; A component comprises the raw material of following weight part: 70-100 parts of base rubber, 0.004-0.4 part of Si-H addition catalyst, 2-22 parts of alkenyl-containing polysilicon Oxane; component B contains the following raw materials in parts by weight: 70-100 parts of gum base, 2-10 parts of alkenyl-containing polysiloxane, 1-6 parts of hydrogen-containing silicone oil, and 0.4-4 parts of hydrogen-containing silicone resin. The silicone rubber obtained after vulcanization molding has a hardness of 17‑22Sh.A and a tear strength greater than 35KN m ‑1 , Tensile strength greater than 8Mpa. The high tear-resistant self-lubricating liquid silicone rubber provided by the present invention improves the tearing performance of liquid silicone rubber in the range of 17-21Sh.A hardness to 35KN m ‑1 , can be applied to the field of high-end automotive plug-in parts.

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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Patent Type & Authority Patents(China)
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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