A kind of one-component addition type liquid silicone rubber and preparation method thereof

A liquid silicone rubber, addition-type technology, which is applied in the field of one-component addition-type liquid silicone rubber and its preparation, can solve the problems of limited tear resistance of liquid silicone rubber, increasing the amount of filler silica, and increasing the viscosity of the product. , to achieve the effect of increasing concentrated cross-linking points, improving tear strength and good fluidity

Active Publication Date: 2017-12-15
DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The methods provided by these patents have very limited improvement in the tear resistance of liquid silicone rubber; in addition, if the amount of filler silica is increased too much, the viscosity of the product will increase and the processability will deteriorate.

Method used

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  • A kind of one-component addition type liquid silicone rubber and preparation method thereof
  • A kind of one-component addition type liquid silicone rubber and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Add 70 parts of vinyl polysiloxane with a viscosity of 8000mPa.s into the mixer, then add 20 parts of white carbon black in 6 times, stir for 0.5h after each addition, raise the temperature to 150°C and stir for 2h, then vacuumize Continue to stir for 2 hours, and finally add the remaining 30 parts of vinyl polysiloxane into the blender, and mix evenly to obtain the base glue.

[0028] Take 100 parts of the above-prepared gum base, add hydrogen-containing silicone oil (mass ratio of 0.1% hydrogen-containing terminal polysiloxane and hydrogen-containing 0.7% side hydropolysiloxane) respectively 3 parts of mixture), 0.1 part of platinum catalyst, 0.05 part of acetylenic alcohol inhibitor and 3 parts of modifying additive with a vinyl content of 2%, stirred evenly, and vacuumized to obtain the one-component addition type liquid silicone rubber.

[0029] Inject the obtained liquid silicone rubber into a mold, mold it at 170°C for 10 minutes, and make a 2mm film. Test the te...

Embodiment 2

[0031] Add 80 parts of vinyl polysiloxane with a viscosity of 16000mPa.s into the mixer, then add 25 parts of white carbon black in 6 times, stir for 0.5h after each addition, heat up to 160°C and stir for 2h, then vacuumize Continue to stir for 2 hours, and finally add the remaining 20 parts of vinyl polysiloxane into the blender, and mix evenly to obtain the base glue.

[0032] Take 100 parts of the above-prepared gum base, add hydrogen-containing silicone oil (mass ratio of 0.1% hydrogen-containing terminal hydropolysiloxane and hydrogen-containing 0.7% side-hydrogen polysiloxane) respectively 4 parts of mixture), 0.2 parts of platinum catalyst, 0.07 parts of acetylenic alcohol inhibitor and 5 parts of modifying additive with a vinyl content of 4%, stirred evenly, and vacuumized to obtain the one-component addition type liquid silicone rubber. The test method is the same as in Example 1, and the test results are shown in Table 1.

Embodiment 3

[0034] Add 90 parts of vinyl polysiloxane with a viscosity of 20000mPa.s into the planetary mixer, then add 30 parts of white carbon black in 6 times, stir for 0.5h after each addition, raise the temperature to 170°C and stir for 2h, then pump Continue to stir in vacuum for 2 hours, and finally add the remaining 10 parts of vinyl polysiloxane into the planetary mixer, and mix well to obtain the base glue.

[0035] Take 100 parts of the base gum prepared above, add hydrogen-containing silicone oil (mass ratio is 3:1 of 0.1% hydrogen-containing terminal hydropolysiloxane and hydrogen-containing 0.7% side-hydrogen polysiloxane) 5 parts of mixture), 0.3 parts of platinum catalyst, 0.09 parts of acetylenic alcohol inhibitor and 7 parts of modification additive with vinyl content of 6%, stirred evenly, and vacuumized to obtain the one-component addition type liquid silicone rubber. The test method is the same as in Example 1, and the test results are shown in Table 1.

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Abstract

The invention discloses a one-component addition type liquid silicone rubber with high tear strength and a preparation method thereof. The components of the liquid silicone rubber are calculated in percent by weight: 60-95 parts of vinyl silicone oil; 5-40 parts of white carbon black; 1-10 parts of hydrogen-containing polysiloxane; 0.1-0.5 parts of platinum catalyst; 0.03-0.2 parts of acetylenic alcohol inhibitors; 1-10 parts of modified additives; wherein the hydrogen-containing polysiloxane is a hydrogen-terminated polysiloxane with a hydrogen content of 0.05-0.3% and a hydrogen content of 0.4-0. 0.8% mixture of pendant hydropolysiloxanes. The invention also discloses a preparation method of the liquid silicone rubber. The prepared one-component addition-type liquid silicone rubber has the characteristics of good mechanical properties, high tear resistance, low viscosity and the like.

Description

technical field [0001] The invention relates to the technical field of silicone rubber processing, in particular to a one-component addition type liquid silicone rubber and a preparation method thereof. Background technique [0002] Liquid silicone rubber is a type of silicone rubber compared to mixing semi-solid silicone rubber and common room temperature vulcanized single-component silicone rubber. This type of rubber has good fluidity, fast vulcanization, and can be cast or injected. Liquid silicone has excellent transparency, tear resistance, resilience, anti-yellowing, thermal stability, water resistance, good air permeability, heat aging resistance and weather resistance. At the same time, it has moderate viscosity and is easy to operate. The product has high transparency. Shrinkage rate≤0.1%. Liquid silicone rubber can be used for trademarks, products, pacifiers, medical supplies, coating, impregnation and perfusion, etc. [0003] Chinese patent application CN 10383...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L83/07C08L83/05C08K13/02C08K3/36C08J3/24
Inventor 程宗盛黄明富刘新烁李伟祝智敏吴慧娟张魁
Owner DONGGUAN DONGYANG SOLAR SCI RES & DEV CO LTD
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