Self-lubricating addition type liquid silicone rubber, and preparation method and application thereof

A liquid silicone rubber, self-lubricating technology, applied in the field of silicone rubber, can solve problems such as low compression set and achieve high tear strength

Active Publication Date: 2019-11-26
JIANGXI BLUESTAR XINGHUO SILICONE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, the purpose of the present invention is to provide a kind of self-lubricating liquid silicone rubber, mainly solve three core problems by raw material and formula design: 1. High tear strength (≥ 45KN / m), satisfy the resistance of installation and use Tear demand; 2. Platinum vulcanized liquid rubber has ultra-low compression set (no secondary vulcanization, the compression set rate of primary vulcanization is less than 20%), which improves the sealing performance of the material and meets the stability requirements of end products; 3. Long-term Controllable lubricity to meet the needs of self-lubrication and high life

Method used

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  • Self-lubricating addition type liquid silicone rubber, and preparation method and application thereof
  • Self-lubricating addition type liquid silicone rubber, and preparation method and application thereof

Examples

Experimental program
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Effect test

preparation example 1

[0043] In a kneader or planetary mixer, 42 parts by weight of vinyl-terminated polysiloxane with a viscosity of 60,000 mPa·s and an alkenyl content of 0.03 mmol / g, 2.8 parts of a viscosity of 200,000 mPa·s, and an alkenyl content of 0.8mmol / g side chain vinyl polysiloxane, 25 parts of BET specific surface area 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, fully mixed under the protection of an inert atmosphere below 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, vinyl content 0.035mmol / g terminal alkenyl polysiloxane, stir evenly to obtain liquid silicone rubber base rubber 1.

preparation example 2

[0045] In a kneader or planetary mixer, 40 parts by weight of methyl vinyl polysiloxane with a viscosity of 60000mPa·s and an alkenyl content of 0.03mmol / g, and 3 parts of a viscosity of 250000mPa·s, alkenyl Polyvinylpolysiloxane with a content of 0.9mmol / g, 27.5 parts of BET with a specific surface area of ​​400m 2 / g of fumed silica and 8 parts of hexamethyldisilazane, 0.5 parts of tetramethyldivinylsilazane and 4.5 parts of deionized water, fully mixed under the protection of an inert atmosphere below 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 alkenyl The content is 0.030mmol / g methyl vinyl polysiloxane, and the liquid silicone rubber base rubber 2 is obtained by stirring evenly.

Embodiment 1

[0050] Preparation of component AB: 100 parts of base gum 1 above, 4.1 parts of terminal vinyl polysiloxane with a viscosity of 20000mPa·s and an alkenyl content of 0.035mmol / g, 7.2 parts of a viscosity of 1000mPa·s, parts of vinyl Side-chain vinyl polysiloxane with a group content of 0.12mmol / g, 3.0 parts of polysiloxane with a viscosity of 400mPa·s and an alkenyl content of 0.9mmol / g containing vinyl groups in both the terminal group and the side chain, 0.014 1 part Castel catalyst, 2.3 parts methyl phenyl silicone oil with a viscosity of 300mPa·s, stir and disperse in a planetary mixer for 30-40min, mix evenly and then vacuumize and defoam to obtain the self-lubricating low pressure variable liquid silicone rubber A component. The above 100 parts of base gum 1, 8.8 parts of vinyl polysiloxane with a viscosity of 20000mPa·s and vinyl polysiloxane with an alkenyl content of 0.035mmol / g, 3.5 parts of vinyl polysiloxane with a viscosity of 400mPa·s, vinyl polysiloxane 2.3 parts...

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Abstract

The invention relates to a self-lubricating addition type liquid silicone rubber. The liquid silicone rubber comprises, by weight, 120-200 parts of an alkenyl-containing polysiloxane, 1-15 parts of ahydrogenated polysiloxane, 30-80 parts of fumed silica, 10-30 parts of a silazane white carbon black treatment agent, 1-30 parts of methyl phenyl silicone oil, 0.004-0.06 part of a Si-H addition catalyst and 0.03-0.6 part of an inhibitor. The types and amounts of the alkenyl-containing polysiloxane and the hydrogenated polysiloxane in a base rubber, a component A and a component B are screened, and the oil seepage rate and the product performances are controlled through raw material screening and formula design, so the addition type liquid silicone rubber has a high tearing strength (greater than or equal to 45 kN / m) and a low permanent compression deformation rate (less than or equal to 20%), also has stable oil seepage, and can keep a self-lubricating effect for a long time. A preparation method of the self-lubricating addition type liquid silicone rubber has the advantages of simplicity, cheap and easily available raw materials, and suitableness for industrial production.

Description

technical field [0001] The invention relates to the technical field of silicone rubber, in particular to an addition-type liquid silicone rubber. 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 fields with low friction requirements. [0003] After the self-lubricating silicone rubber material is cured and formed, many fine oil droplets will slowly precipitate on the surface of the product. This can effectively reduce surface f...

Claims

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Application Information

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IPC IPC(8): C08L83/07C08L83/05C08L83/04C08K9/06C08K3/36
CPCC08L83/04C08L2205/025C08L2205/035C08K9/06C08K3/36
Inventor 雷丽娟郭鹏黎哲辉
Owner JIANGXI BLUESTAR XINGHUO SILICONE CO LTD
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