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A kind of preparation method of high thermal conductivity side chain type liquid crystal polymer film material

A side chain type liquid crystal and polymer film technology, which is applied in the field of preparation of high thermal conductivity side chain type liquid crystal polymer film materials, can solve problems such as affecting engineering applications, worsening processing performance, and decreasing polymer electrical insulation and mechanical properties. , to achieve the effects of excellent mechanical properties, high thermal conductivity and excellent thermal stability

Active Publication Date: 2020-11-24
浏星新材料科技(江苏)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The construction of insulating and heat-conducting particle networks usually requires a filler content of ≥65wt%, but at this time the electrical insulation and mechanical properties of the polymer will be significantly reduced, and the processing performance will be deteriorated, seriously affecting its engineering application.

Method used

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  • A kind of preparation method of high thermal conductivity side chain type liquid crystal polymer film material
  • A kind of preparation method of high thermal conductivity side chain type liquid crystal polymer film material
  • A kind of preparation method of high thermal conductivity side chain type liquid crystal polymer film material

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preparation example Construction

[0034] Such as figure 1 As shown, the preparation method of the high thermal conductivity side chain type liquid crystal polymer film material of the present invention comprises the following steps:

[0035] 1) Preparation of side chain liquid crystal polysiloxane solution

[0036] According to the mass ratio of (0.5-1.5): (2-18), the side chain liquid crystal polysiloxane is dissolved in an organic solvent, heated at a temperature of 25-80° C., and soaked for 10-12 hours;

[0037] Among them, the side chain liquid crystal polysiloxane is obtained by graft polymerization of polysiloxane and liquid crystal monomer, wherein polysiloxane is polymerized with trans-4-vinyl-trans-4'-propylbicyclohexane The obtained side chain liquid crystal polysiloxane is P 1 P 2 P 3 P 4 . Its structure is shown in Table 1.

[0038] Table 1 Molecular structural formulas of different side chain liquid crystal polysiloxanes

[0039]

[0040]

[0041] The synthetic method of above-mentio...

Embodiment 1

[0053] 1) Preparation of side chain liquid crystal polysiloxane solution

[0054] The side chain liquid crystal polysiloxane (P 1 ) was dissolved in acetone, soaked for 12 hours after heating at a temperature of 25°C;

[0055] 2) Pretreatment of boron nitride nanosheets with inorganic high thermal conductivity particles

[0056] Soak the boron nitride nanosheets in a nitric acid solution with a mass fraction of 20%, the temperature is 90°C, and the soaking time is 4h; take it out and centrifuge it at a speed of 7000r / min for 0.5h, and then soak it in peroxide at room temperature In the hydrogen solution, the concentration of the hydrogen peroxide solution is 30%, and the soaking time is 1h;

[0057] 3) Modification of boron nitride nanosheets with inorganic high thermal conductivity particles

[0058] Then, the sample prepared in step 2) was added into the tetrahydrofuran solution (THF:monoamine POSS=1:2) dissolved with an appropriate amount of monoamine-based POSS accordin...

Embodiment 2

[0064] 1) Preparation of side chain liquid crystal polysiloxane solution

[0065] The side chain liquid crystal polysiloxane (P 2 ) is dissolved in dimethylformamide, soaked for 10 hours after heating at a temperature of 60°C;

[0066] 2) Pretreatment of boron nitride nanotubes with inorganic high thermal conductivity particles

[0067] Soak the boron nitride nanotubes in a nitric acid solution with a mass fraction of 25%, the temperature is 90°C, and the soaking time is 5h; take out and centrifuge at a speed of 6000r / min for 1h, and then soak in hydrogen peroxide at room temperature In the solution, the concentration of hydrogen peroxide solution is 30%, and the soaking time is 0.5h;

[0068] 3) Modification of boron nitride nanotubes with inorganic high thermal conductivity particles

[0069] Then, the sample prepared in step 2) was added into the tetrahydrofuran solution (THF:monoamine POSS=1:2) dissolved with an appropriate amount of monoamine-based POSS according to th...

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Abstract

The invention discloses a preparation method of a high thermal conductivity side chain-type liquid crystal polymer film material. The preparation method comprises: preparing a side chain liquid crystal polysiloxane solution, pretreating inorganic high thermal conductive particles, modifying the inorganic high thermal conductive particles, dispersing the surface functionalization-modified inorganichigh thermal conductive particles in an organic solvent, carrying out ultrasonic treatment, adding the dispersion into the side chain liquid crystal polysiloxane solution, carrying out dispersion, casting the mixed solution to a glass template, heating to volatilize so that a film is formed and is a film material with a certain thickness and a shape, and carrying out annealing treatment in an inert protective atmosphere. The preparation method provides high thermal conductivity and high mechanical strength for the high thermal conductivity side chain-type liquid crystal polymer film materialwhen the thermal conductivity material filling amount is low.

Description

technical field [0001] The invention relates to a heat-conducting material for electronic packaging, in particular to a method for preparing a high-heat-conducting side chain type liquid crystal polymer film material. Background technique [0002] With the development of industrial demand and science and technology, newer and higher requirements are put forward for various engineering heat-conducting materials. In order to ensure the reliability of electronic components operating at the ambient temperature, it is necessary to use high heat dissipation interface materials and packaging materials to quickly and effectively transfer and release the heat accumulated by heating components to prolong the service life of electronic components. Therefore, the research and development of polymer-based thermally conductive composite materials with high thermal conductivity and excellent mechanical properties has urgent theoretical significance and practical application value for the d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J7/00C08J5/18C08L83/04C08L83/06C08L83/08C08K9/02C08K9/06C08K3/38C08K7/24C08K3/34C09K5/14
CPCC08J5/18C08J7/08C08J2383/04C08J2383/06C08J2383/08C08K3/34C08K7/24C08K9/02C08K9/08C08K2003/385C09K5/14
Inventor 李颖李成功张亮
Owner 浏星新材料科技(江苏)有限公司