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Key liquid silicone rubber composition with ultralong striking life and preparation method of key liquid silicone rubber composition

A technology of liquid silicone rubber and composition, which is applied in the field of high-life key liquid silicone rubber composition and its preparation, which can solve the problems of not being able to meet the requirements of high-life key buttons, and achieve the effects of high production efficiency and ultra-high anti-shock life

Inactive Publication Date: 2016-09-28
ZHEJIANG XINAN CHEM INDAL GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the anti-shock life of ordinary liquid key silicone rubber is about 10 million times, which is far from meeting the requirements of high-life keys (the anti-shock life reaches 20 million times without damage)

Method used

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  • Key liquid silicone rubber composition with ultralong striking life and preparation method of key liquid silicone rubber composition
  • Key liquid silicone rubber composition with ultralong striking life and preparation method of key liquid silicone rubber composition
  • Key liquid silicone rubber composition with ultralong striking life and preparation method of key liquid silicone rubber composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A key liquid silicone rubber composition with ultra-high impact life is prepared by the following method:

[0037] 100 parts of (A) component vinyl-terminated polymethylsiloxane with a viscosity of 10,000 mPa.s and a vinyl molar content of 0.4%, (C) component fumed silica 40 of Degussa A380 Parts, (D) Component 12 parts of hexamethyldisilazane, simultaneously added to the kneader at room temperature and mixed evenly, then heated up to 170°C and mixed for about 3 hours, cooled to obtain the base rubber. Add 1 part of (A) component vinyl-terminated polymethylsiloxane with a viscosity of 10,000mPa.s and a vinyl molar content of 0.25% to 100 parts of base gum, and (G) component platinum complex 24ppm, mix Uniformly obtain glue A; add 15 parts of (A) component vinyl-terminated polymethylsiloxane with a viscosity of 10,000mPa.s and a vinyl molar content of 0.25% to 100 parts of the base glue, and a molar hydrogen content of 1.0% 2 parts of (B) component hydrogen-containing p...

Embodiment 2

[0039] A key liquid silicone rubber composition with ultra-high impact life is prepared by the following method:

[0040] 100 parts of (A) component vinyl-terminated polymethylsiloxane with a viscosity of 10,000 mPa.s and a vinyl molar content of 0.4%, and (C) component model of fumed silica 40 of Degussa A380 Parts, (D) Component 12 parts of hexamethyldisilazane, add to the kneader at room temperature and mix evenly, then raise the temperature to 170°C and mix for about 3 hours, cool down to obtain the base rubber. Then divide it into two parts evenly in a planetary mixer, and add 15 parts of (A) component vinyl-terminated polymethylsiloxane ( G) Component platinum complex 24ppm, mix well to obtain glue A; add (A) component vinyl-terminated polymethylsiloxane with a viscosity of 2,000mPa.s and a vinyl molar content of 0.6% to 100 parts of the base glue 1 part of alkane, 4 parts of (B) component hydrogen-containing polysiloxane with a molar hydrogen content of 0.6%, 6 parts o...

Embodiment 3

[0042] A key liquid silicone rubber composition with ultra-high impact life is prepared by the following method:

[0043]100 parts of (A) component vinyl-terminated polymethylsiloxane with a viscosity of 100,000mPa.s and a vinyl molar content of 2%, (C) component of Degussa A380 by gas phase method or precipitated white carbon 10 parts of black, 10 parts of (D) hexamethyldisilazane and divinyltetramethyldisilazane were added to the kneader at room temperature and mixed evenly, then heated to 170°C and mixed for about 3 hours, cooled to obtain the base glue. Add 1 part of (A) component vinyl-terminated polymethylsiloxane with a viscosity of 10,00 mPa.s and a vinyl molar content of 5% to 100 parts of base gum, and (G) component platinum prepared by Karstedt method -Vinyl siloxane complex 15ppm, mixed evenly to obtain A glue; add (A) component vinyl-terminated polymethylsilane with a viscosity of 10,00mPa.s and a vinyl molar content of 5% to 100 parts of the base glue 30 parts ...

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Abstract

The invention discloses a key liquid silicone rubber composition with ultralong striking life and a preparation method of the key liquid silicone rubber composition. The key liquid silicone rubber composition with the ultralong striking life is prepared from the following components in parts by mass: 101 to 130 parts of vinyl-terminated polymethylsiloxane, 0.5 to 10 parts of hydrogen polysiloxane, 11 to 30 parts of white carbon black, 5 to 15 parts of hexamethyldisilazane, 1 to 10 parts of MQ-type vinyl silicone resin, 50 to 1,000ppm of inhibitor and 0.5 to 20ppm of catalyst. The preparation method of the key liquid silicone rubber composition with the ultralong striking life comprises the steps of preparing base rubber, preparing rubber A, preparing rubber B, performing posttreatment and the like. The key liquid silicone rubber composition with the ultralong striking life and the preparation method of the key liquid silicone rubber composition, disclosed by the invention, have the characteristics of good mechanical property, excellent striking resisting life, high production efficiency and wide application range.

Description

technical field [0001] The invention relates to the technical field of addition-type liquid silicone rubber, in particular to a long-life button liquid silicone rubber composition and a preparation method thereof. Background technique [0002] With the gradual maturity and improvement of the two-component liquid silicone rubber injection molding technology, with the advantages of fast vulcanization speed of addition-type liquid silicone rubber, small linear shrinkage rate, and simple post-processing technology, the production of silicone rubber keys has introduced addition-type Liquid silicone rubber injection molding technology has gradually become one of its main application fields. [0003] In addition to the technical indicators such as hardness, tensile strength, elongation, tear strength, and linear shrinkage of the addition-type key liquid silicone rubber, the impact life is a very important performance indicator in use. At present, the anti-shock life of ordinary li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/07C08L83/05C08L83/04C08K3/36
CPCC08L83/04C08L2205/025C08L2205/035C08K3/36
Inventor 谢亚军周游吴家伟许二建邓圣志冯文海
Owner ZHEJIANG XINAN CHEM INDAL GROUP