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Liquid potting composite of dicomponent addition type silicone rubber and preparation

A two-component, addition type technology, applied in other chemical processes, chemical instruments and methods, etc., can solve the problems of environmental pollution, strong corrosion, easy cracking, etc., and achieve the effect of convenient use and stable performance.

Inactive Publication Date: 2009-04-29
ZHEJIANG XINAN CHEM INDAL GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, epoxy potting is commonly used. This kind of potting material is highly corrosive and pollutes the environment, so it is not environmentally friendly, and it is easy to crack under low temperature conditions.

Method used

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  • Liquid potting composite of dicomponent addition type silicone rubber and preparation

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Experimental program
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Effect test

preparation example Construction

[0044] The present invention also provides the preparation and curing method of this composition, the specific method is as follows: mix the above-mentioned (A) (B) (C) components with a kneader and knead, the heat treatment temperature is preferably 80 ~ 250 ° C, more preferably It is preferably 100-200°C, more preferably 140-180°C, and the heat treatment time is preferably 30 minutes to 10 hours, more preferably 1 to 4 hours, and even more preferably 1 to 2 hours, to prepare the basic composition; Then add (D) (E) (F) components to the basic composition, vacuum defoaming, and high temperature curing to obtain silicone rubber. The defoaming time is controlled at 5-30 minutes, and the curing temperature is preferably 100-180°C. for 2-10 minutes.

[0045] To test the performance of silicone rubber, the test standard is: Viscosity is measured by rotational viscometer, tensile strength: measured according to GB / T528-1998, tear strength: measured according to GB / T 529-1999, hardne...

Embodiment 1

[0047] Embodiment 1: 100 parts by weight of polyorganosiloxane with a viscosity of 1000 mPas, 40 parts by weight of high-purity quartz powder, and 6 parts of hydrogen-containing silicone oil with a hydrogen content of 0.3% and a viscosity of 30 mPas at 25° C. were kneaded with a kneader, and then heat-treated at 150° C. for 2 hours to prepare a base composition. With respect to 100 parts by weight of the above-mentioned base composition, 10 ppm of platinum catalyst (1,3-divinyl-1,1,3,3-tetramethyldisiloxane platinum complex), 0.5 wt % of hexyne Cyclohexanol as inhibitor and 0.004wt% benzotriazole as flame retardant. The mixture was defoamed in vacuum for 10 minutes, cured in a flat vulcanizer at 150° C. for 5 minutes to obtain a silicone rubber sheet with a thickness of 2 mm for performance testing.

Embodiment 2

[0048] Embodiment 2: 100 parts by weight of polyorganosiloxane with a viscosity of 1000 mPas, 40 parts by weight of high-purity quartz powder, and 10 parts of hydrogen-containing silicone oil with a hydrogen content of 0.18% and a viscosity of 30 mPas were kneaded with a kneader, and then heat-treated at 150° C. for 2 hours to prepare a basic composition. For 100 parts by weight of the above-mentioned basic composition, 10 ppm of platinum was added Catalyst, 0.5 wt% hexynylcyclohexanol as inhibitor and 0.004 wt% benzotriazole as flame retardant. The mixture was defoamed in vacuum for 10 minutes, and cured in a flat vulcanizer at 150° C. for 5 minutes to obtain a silicone rubber sheet with a thickness of 2 mm for performance testing.

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Abstract

The invention relates to a liquid filling and sealing composition for bi-component additive silicon rubber and a preparation method thereof. The composition comprises the following components from (A) to (F): (A) 100 mass portions of univalent unsaturated fatty hydrocarbon polysiloxane, wherein at least 2 or more than 2 bonds in each molecule are connected to a silicon atom; (B) 0.1 to 50 mass portions of hydrogen atomic hydrogenated polysiloxane, wherein at least 2 or more than 2 bonds in each molecule are connected to a silicon atom; (C) 10 to 70 mass portions of electronic grade quartz powder; (D) platinum based catalyst; (E) a triazole compound; and (F) 0.001 to 0.009 mass portion of acetylenyl cyclohexanol. The preparation method is as follows: the (A) component, the (B) component and the (C) component are mixed and milled by a kneader to prepare a basic composition; and the (D) component, the (E) component and the (F) component are added into the basic composition, and the mixture is subjected to vacuum defoamation and high-temperature solidification to obtain the silicon rubber. The liquid filling and sealing composition for the bi-component additive silicon rubber is convenient to use, is safe and reliable, does not pollute the environment, has stable service performance, can not be cracked at a low temperature, and has the characteristics of moisture protection, dust prevention, corrosion resistance, shock resistance and so on.

Description

technical field [0001] The invention relates to a liquid potting composition of two-component addition type silicone rubber and a preparation method thereof, which are mainly used for assembly and sealing of electronic components and the like. technical background [0002] With the development of science and technology, electronic components and logic circuits tend to be denser and miniaturized; therefore, higher requirements are placed on the stability of assembled electrical appliances. In order to prevent moisture, dust and harmful gases from affecting electronic components Intrusion, slow down the vibration, prevent external damage and stabilize the parameters of components, to minimize the adverse effects of the outside world, it is necessary to potting electronic components. Epoxy potting is commonly used at present. This kind of potting material is highly corrosive and pollutes the environment, so it is not environmentally friendly, and it is easy to crack under low t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L83/07C08K3/36C08K5/3472C08K5/05C08J3/24C09K3/10C08L83/05
Inventor 王伟章坚任不凡邵月刚叶全明
Owner ZHEJIANG XINAN CHEM INDAL GROUP
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