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Two-component irreversible color-changing sealing silica gel and preparation method thereof

A two-component, silica gel technology, applied in the direction of adhesives, adhesive additives, non-polymer adhesive additives, etc., can solve the problem of non-reversible discoloration products without temperature change, rising defect rate, and little difference between heating and non-heating of circuit boards And other issues

Active Publication Date: 2021-05-18
HUNAN KOSEN NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] There is little difference between heating and non-heating of different circuit boards, and non-heating or repeated heating will affect product performance and increase the defective rate
At this stage, manual marking is often used to distinguish whether the circuit substrate has been heated, and manual marking is often time-consuming, laborious and error-prone
Although there has been considerable development in reversible color-reversible sealants on the market, in terms of irreversible coloring, because the market is small, there are no related products available, or pigments that can achieve irreversibility are very expensive, and there are few related researches. As a result, there are currently no similar or related temperature-changing irreversible color products.

Method used

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  • Two-component irreversible color-changing sealing silica gel and preparation method thereof
  • Two-component irreversible color-changing sealing silica gel and preparation method thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0078] 1) Preparation of component A: Mix polyvinyl siloxane, silicon dioxide, and inhibitor in proportion. Then heat up and knead, add platinum catalyst after cooling, and get A component after mixing evenly.

[0079] 2) Preparation of component B: mix polyvinylsiloxane, hydrogen-containing siloxane, and copper hydroxide in proportion, and finally obtain component B after stirring evenly.

[0080] 3) Preparation of two-component irreversible discoloration sealing silica gel: after bottling components A and B in proportion, a two-component irreversible discoloration sealing silica gel is obtained.

[0081] As preferably, the consumption of each component is:

[0082] A component is:

[0083] 60-90 parts by weight of polyvinylsiloxane, preferably 65-85 parts by weight, more preferably 70-80 parts by weight.

[0084] 8-40 parts by weight of silicon dioxide, preferably 10-35 parts by weight, more preferably 12-30 parts by weight.

[0085] The platinum catalyst is 0.0005-0.005...

Embodiment 1

[0101] Mix 62.5g of polyvinylsiloxane (viscosity of 30000mPa·S) with at least 2 vinyl groups on a single molecule, 12.5g of polyvinylsiloxane (viscosity of 50000mPa) with at least 10 vinyl groups on a single molecule ·S), 25g specific surface area is 300m 2 / g of precipitated silica, 0.006g of 1-ethynyl-1-cyclohexanol inhibitor were added to a vacuum kneader and mixed for 1h. Then heat up to 180°C and knead for 3 hours, then vacuumize for 1 hour; then cool to room temperature, add 0.0015g of platinum catalyst, stir well to obtain liquid compound A (component A).

[0102] Mix 87g polyvinylsiloxane (viscosity of 6000mPa·S) with at least 2 terminal vinyl groups on a single molecule, 8.7g hydrogen-containing siloxane (viscosity of 200mPa·S) with at least 4 silicon-hydrogen bonds on a single molecule S), 5g of copper hydroxide (average particle size: 500nm) was added into a vacuum mixer and stirred for 1h. Then obtain the liquid glue B (component B) after stirring evenly.

[010...

Embodiment 2

[0105] Mix 62.5g of polyvinylsiloxane (viscosity of 30000mPa·S) with at least 2 vinyl groups on a single molecule, 12.5g of polyvinylsiloxane (viscosity of 50000mPa) with at least 10 vinyl groups on a single molecule ·S), 25g specific surface area 300m 2 / g of fumed silica, 0.006g of 1-ethynyl-1-cyclohexanol inhibitor were added to a vacuum kneader and mixed for 1h. Then the temperature was raised to 180°C and kneaded for 3 hours, followed by vacuum treatment for 1 hour; then cooled to room temperature, and 0.0015 g of platinum catalyst was added. After mixing evenly, liquid glue A (component A) was obtained.

[0106] Mix 87g polyvinylsiloxane (viscosity of 6000mPa·S) with at least 2 terminal vinyl groups on a single molecule, 8.7g hydrogen-containing siloxane (viscosity of 200mPa·S) with at least 4 silicon-hydrogen bonds on a single molecule S), 5g of copper hydroxide (average particle size: 500nm) was added into a vacuum mixer and stirred for 1h. Then, the liquid compound...

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Abstract

The invention provides a two-component irreversible color-changing sealing silica gel and a preparation method thereof. The two-component irreversible color-changing sealing silica gel can maintain a primary color state for a long time without changing color when not heated, and can maintain a stable state for a long time without changing color again after changing color so that the heating manual identification procedure can be replaced, the production process is optimized, manpower is saved, and the performance of the circuit substrate and the performance of the silica gel pouring sealant are not affected. Meanwhile, the method for preparing the two-component irreversible color-changing sealing silica gel is simple and easy to operate, the adopted raw materials are simple and easy to obtain, and the two-component irreversible color-changing sealing silica gel is suitable for large-scale industrial application. The economic benefit can be greatly improved, the production cost is reduced, and the economic benefit is improved.

Description

technical field [0001] The invention relates to an irreversible discoloration sealing silica gel, in particular to a two-component irreversible discoloration sealing silica gel and a preparation method thereof, belonging to the technical field of production and preparation of sealing silicone rubber. Background technique [0002] Sealing silicone is a liquid silicone rubber. By pouring the liquid colloid onto the surface of the product to make it vulcanized and molded, the product is sealed to achieve heat insulation, moisture-proof, anti-take advantage, insulation and other effects. Used as potting, bonding and coating materials for electronic components, as well as electronic and electrical components that require waterproof insulation, LED screens, wind energy motors, PCB substrates, etc. And various power modules, bonding and sealing of control modules. During the substrate processing process, it is usually heated at 60-80° C. for 10-30 minutes to allow the cross-linki...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J183/07C09J11/04C09J11/08
CPCC09J183/04C09J11/04C09J11/08C08K2003/2248C08L2205/025C08L83/04C08K3/36C08K3/22
Inventor 郑保昌欧阳光华杨立镨钟雪琴石亮
Owner HUNAN KOSEN NEW MATERIAL
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