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Double-component addition self-adhesive silicon rubber

An addition-type, silicone rubber technology, applied in the field of silicone rubber, can solve problems such as high hardness, unsatisfactory, and non-self-adhesive properties

Active Publication Date: 2010-03-10
CHENGDU TALY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the silicone rubber in the domestic market cannot meet the above requirements
Dow Corning has introduced SE4430, a low-hardness silicone rubber with high thermal conductivity, but the hardness of this product is still high and the surface is not self-adhesive.

Method used

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  • Double-component addition self-adhesive silicon rubber
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  • Double-component addition self-adhesive silicon rubber

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0047] The cross-linking agent with low hydrogen content described in material A is prepared by the following method:

[0048] Add 100 parts of hydrogen-containing silicone oil and 50 to 100 parts of D4 into the reactor, add 20 to 50 parts of activated clay or cation exchange resin as a catalyst, stir, and react at a temperature of 85°C to 120°C for 6 to 10 hours. Stop stirring, cool to room temperature, and filter, and the obtained filtrate is a cross-linking agent with low hydrogen content.

[0049] The base rubber in materials A and B is prepared from 100 parts of vinyl silicone oil, 80-130 parts of halogen-free flame-retardant fillers, and 150-350 parts of thermally conductive fillers. The halogen-free flame-retardant fillers are aluminum hydroxide or / and melamine cyanurate, the thermally conductive filler is any one or more of aluminum oxide, aluminum nitride, and zinc oxide.

[0050] The preparation method of base glue comprises the following steps:

[0051] (1), pro...

Embodiment 1

[0059] Material A of the two-component addition type self-adhesive silicone rubber in this embodiment is made by mixing 100 parts of base rubber and 2 parts of crosslinking agent with low hydrogen content; material B is made of 100 parts of base rubber, chloroplatinic acid complex 0.18 parts mixed.

[0060] See Table 2 for the raw material proportions of the crosslinking agent with low hydrogen content and the base rubber. The preparation method of the cross-linking agent with low hydrogen content and the base rubber is the same as that described in the embodiment, wherein the reaction temperature used to prepare the cross-linking agent is 85° C., and the reaction time is 10 h. When preparing vinyl silicone oil, heat up to 180°C after the initial polymerization of the raw materials, maintain for 30 minutes, and then remove the low molecular weight; when preparing the base rubber, heat up to 150°C to 160°C under stirring after the first feeding, and maintain under stirring Aft...

Embodiment 2

[0067] Material A of the two-component addition type self-adhesive silicone rubber of this embodiment is made by mixing 100 parts of base rubber and 2.8 parts of crosslinking agent with low hydrogen content; material B is made of 100 parts of base rubber and chloroplatinic acid complex 0.12 parts and 1 part color masterbatch are mixed.

[0068] See Table 2 for the raw material proportions of the crosslinking agent with low hydrogen content and the base rubber. The preparation method of the cross-linking agent with low hydrogen content and the base rubber is the same as that described in the embodiment, wherein the reaction temperature for preparing the cross-linking agent is 120° C., and the reaction time is 8 hours. When preparing vinyl silicone oil, heat up to 150°C after the initial polymerization of the raw materials, maintain for 120 minutes, and then remove the low molecular weight; when preparing the base rubber, heat up to 170°C to 180°C under stirring after the first ...

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Abstract

The invention relates to a silicon rubber used for insulation protection of electronic products, in particular to a double-component addition self-adhesive silicon rubber. The double-component addition self-adhesive silicon rubber of the invention comprises material A and material B, and the mass ratio of the material A to the material B is 1:1, wherein material A is composed of 100 parts of basicrubber and 2-2.8 parts of cross linking agent containing low content of hydrogen; and material B is composed of 100 parts of basic rubber and 0.12 to 0.18 part of chloroplatinic acid complex. In theinvention, the raw material ratio of material A and material B of the silicon rubber is strictly controlled, each material is treated by a special process, therefore, the silicon rubber of the invention has good mobility, flame resistance, thermal conductivity and flexibility simultaneously, and have a certain degree of self-adhesion property. To the silicon rubber of the invention, the thermal conductivity is not less than 1.0w / m.k, the flame resistance is up to UL94V0 grade, the hardness is 12 to 16HC, and the shrinkage rate is less than 0.5%.

Description

technical field [0001] The invention relates to a silicone rubber used for insulation protection of electronic products, in particular to a two-component addition type self-adhesive silicone rubber. Background technique [0002] In order to prevent the intrusion of moisture, dust and harmful gases to electronic components, slow down vibration, prevent external damage, stabilize component parameters, and minimize the adverse effects of the outside world, it is necessary to protect electronic components and other electronic products. Because silicone rubber has the advantages of good dielectric properties, wide operating temperature range, and excellent shock absorption, electronic products are often sealed with liquid silicone rubber materials for protection. Silicone rubber used for the protection of electronic products generally requires good fluidity before curing and good thermal conductivity and flame retardancy after curing. However, silicone rubber itself is flammable...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/07C08L83/05C08K9/06C08K3/22C08K5/3492
Inventor 陶云峰张先银徐燕芬刘备辉方辉
Owner CHENGDU TALY TECH CO LTD
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