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Barium sulfate electronic pouring sealant, preparation method and application thereof

A technology of barium sulfate and potting glue, applied in the directions of adhesives, non-polymer adhesive additives, adhesive additives, etc., can solve problems such as affecting the heat dissipation efficiency of electronic products, affecting the normal development of the electronic industry, and poor thermal conductivity of barium sulfate. , to achieve good application prospects, small number and area of ​​internal interfaces, and low cost

Active Publication Date: 2021-05-28
ZHUSHAN COUNTY QINBA BARIUMSALT CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the prior art, the electronic potting compound is mainly composed of base filler, thermally conductive filler and other additives. The thermally conductive filler is usually made of metal oxide or metal nitride ceramics. The use of ceramic materials can bring higher thermal conductivity on the one hand, and at the same time It also has good electrical insulation, and has relatively good stability under high temperature and low temperature conditions. The use of composite electronic potting glue is required. However, the price of ceramic materials is expensive, and the preparation of ceramic materials requires a large amount of rare earth resources, when the exploitation or purchase of these resources is restricted, it will directly affect the normal development of China's electronics industry
[0004] In the prior art, there is a technical solution of using barium sulfate precipitation as a thermally conductive filler for electronic potting adhesives. Barium sulfate has strong chemical inertness, good stability, acid and alkali resistance, and moderate hardness. It is a better choice for fillers, but barium sulfate The thermal conductivity is extremely poor, directly used as a filler for electronic potting adhesives will affect the heat dissipation efficiency of electronic products and affect the performance of equipment

Method used

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  • Barium sulfate electronic pouring sealant, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Preparation of barium sulfate whiskers:

[0034] Weigh 1kg of barium sulfide and 20L of water, mix and stir until the barium sulfide is dissolved, add 4kg of ethanol and 500g of silane coupling agent KH550, mix and stir, heat to 50°C, keep stirring for 10min to obtain a barium sulfide mixed solution;

[0035] Then add 100 g of sodium α-alkenyl sulfonate to the barium sulfide mixed solution, keep at 50° C., and stir until the sodium α-alkenyl sulfonate is completely dissolved to obtain a precursor solution;

[0036] Then add 2mol / L sodium sulfate solution dropwise to the precursor solution, keep the stirring speed at 25r / min during the dropwise addition, keep the stirring speed constant after adding 3L, slowly cool down to 25°C, and the cooling time is 6h. After filtering, the filter cake was taken and dried to obtain barium sulfate whiskers.

[0037] Preparation of modified barium sulfate whiskers:

[0038] Take by weighing 1kg barium sulfate whisker and join in 100L ...

Embodiment 2

[0044] Preparation of barium sulfate whiskers:

[0045] Weigh 1kg of barium sulfide and 22L of water, mix and stir until the barium sulfide is dissolved, add 4.5kg of ethanol and 600g of silane coupling agent KH550, mix and stir, heat to 52°C, keep stirring for 10min to obtain a barium sulfide mixed solution;

[0046] Then add 120 g of sodium α-alkenyl sulfonate to the barium sulfide mixed solution, keep at 52° C., and stir until the sodium α-alkenyl sulfonate is completely dissolved to obtain a precursor solution;

[0047]Place the precursor solution in a stable magnetic field, the strength of the magnetic field is 0.001T, and the direction of the magnetic field is perpendicular to the liquid surface of the precursor solution, then add 2mol / L sodium sulfate solution dropwise to the precursor solution, and keep stirring while adding The speed is 20r / min. After adding 3L dropwise, keep the stirring speed constant, slowly cool down to 26°C, and the cooling time is 6h. After the ...

Embodiment 3

[0055] Preparation of barium sulfate whiskers:

[0056] Weigh 1kg of barium sulfide and 25L of water, mix and stir until the barium sulfide is dissolved, add 5kg of ethanol and 700g of silane coupling agent KH550, mix and stir, heat to 55°C, keep stirring for 10min to obtain a barium sulfide mixed solution;

[0057] Then add 150 g of sodium α-alkenyl sulfonate to the barium sulfide mixed solution, keep at 55° C., and stir until the sodium α-alkenyl sulfonate is completely dissolved to obtain a precursor solution;

[0058] Place the precursor solution in a stable magnetic field, the strength of the magnetic field is 0.0015T, and the direction of the magnetic field is perpendicular to the liquid surface of the precursor solution, then add 2mol / L sodium sulfate solution dropwise to the precursor solution, and keep stirring while adding The speed is 30r / min. After dropping 3L, keep the stirring speed constant, slowly cool down to 28°C, and the cooling time is 6h. After the cooling...

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Abstract

The invention provides a barium sulfate electronic pouring sealant, a preparation method and application thereof. The preparation method comprises the steps: preparing a component A, wherein vinyl-terminated silicone oil, hydrogen-containing silicone oil and modified barium sulfate whiskers are added into a vacuum kneading machine to be stirred and mixed to obtain the component A; preparing a component B: vinyl-terminated silicone oil, chloroplatinic acid and the modified barium sulfate whiskers are added into a vacuum kneading machine to be stirred and mixed to obtain the component B; and mixing the component A and the component B, and then curing in a magnetic field to obtain the barium sulfate electronic pouring sealant. According to the invention, the barium sulfate electronic pouring sealant adopts barium sulfate as a heat-conducting filler, is low in cost, has good heat-conducting property and mechanical strength, and has a good application prospect.

Description

technical field [0001] The invention relates to the technical field of electronic packaging, in particular to a barium sulfate electronic potting glue and its preparation method and application. Background technique [0002] With the continuous development of electronic technology, the operating speed of equipment continues to increase, and the integration of electronic equipment is getting higher and higher. High-density electronic equipment will also emit more heat during operation, affecting electrical performance and equipment. The stability of electronic potting adhesives can not only dissipate heat well, but also play the role of moisture-proof, dust-proof and shock-proof. Therefore, electronic potting adhesives are more and more widely used in electronic products. [0003] In the prior art, the electronic potting compound is mainly composed of base filler, thermally conductive filler and other additives. The thermally conductive filler is usually made of metal oxide o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J183/07C09J183/05C09J11/04
CPCC09J183/04C09J11/04C08L2205/025C08L2203/206C08L83/04C08K9/02C08K7/08
Inventor 李盛龙付荣华赵国旗周荣进付康赵远东
Owner ZHUSHAN COUNTY QINBA BARIUMSALT CO LTD