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A kind of insulating stretch-resistant heat-conducting coating and its preparation method and application

A heat-conducting coating and anti-stretching technology, which is applied in fireproof coatings, polyurea/polyurethane coatings, coatings, etc., can solve the problem of elongation, temperature resistance, insulation and high thermal conductivity of capacitor aluminum shell coatings, paint coatings, etc. The temperature resistance of the film has high requirements and affects the appearance quality of the circuit board, etc., so as to achieve the effects of easy promotion and use, good elongation and simple preparation method

Active Publication Date: 2019-07-26
江门市德佑金属材料实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, the paint film must have high insulation. When the withstand voltage performance is insufficient, it will cause capacitor breakdown
The stamped capacitors are packaged on the circuit board, which will be welded at high temperature for several times. Under high temperature, general polymer materials are prone to yellowing, which affects the appearance quality of the circuit board. Therefore, there are also high requirements for the temperature resistance of the paint film.
[0005] Traditional coatings cannot meet the comprehensive requirements of elongation, temperature resistance, insulation and high thermal conductivity of capacitor aluminum shell coatings, which restricts the development trend of capacitors with longer life and better quality

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The following proportions (by mass parts) were used to prepare insulating and stretch-resistant thermally conductive coatings: 25 parts of polyurethane polyol A, 25 parts of polyurethane polyol B, 26.85 parts of mixed solvent, 1 part of polyester hyperdispersant, and 1.2 parts of silane coupling agent part, 15 parts of aluminum oxide, 5 parts of boron nitride, 1 part of graphene, 0.3 part of organosilicon, 0.15 part of polyether modified organosilicon, 0.5 part of polysiloxane, and its specific steps are:

[0030] 1) Put polyurethane polyol resin A, polyurethane polyol resin B, and mixed solvent into a mixer and stir until they are uniformly dispersed to obtain a mixture.

[0031] 2) Mix silane coupling agent, polyester hyperdispersant, aluminum oxide, boron nitride, graphene, silicone, polyether modified silicone and polysiloxane with the mixture obtained in step 1) Uniformly, to obtain mixed raw materials.

[0032] 3) Grind the mixed raw material obtained in step 2) ...

Embodiment 2 4

[0034] Compared with Embodiment 1, Embodiments 2 to 4 differ only in the ratio of raw materials (by mass parts), see Table 1 for details.

[0035] Table 1 The proportioning table of raw material parts by mass in Examples 2 to 4

[0036] Embodiment two Embodiment Three Embodiment four Polyurethane polyol A 30 29 28 Polyurethane polyol B 14.2 15 20 mixed solvent 22.45 22.65 25.85 Polyester Hyperdispersant 1 1 1 A silane coupling agent 1.4 1.4 1.2 Aluminum oxide 20 10 5 boron nitride 10 10 1 Graphene 1 10 18 Silicone 0.3 0.25 0.3 Polyether modified silicone 0.15 0.2 0.15 polysiloxane 0.5 0.5 0.5

Embodiment 5

[0038] The aluminum plate with a thickness of 0.2-0.5 mm is subjected to pretreatments such as degreasing and chromizing, and the insulating and stretch-resistant thermally conductive coatings prepared in each embodiment and the existing commercially available coatings of the same type are respectively coated on the above-mentioned cleaning surface with a wire bar coater. Bake the clean aluminum plate at 245°C for 60-80s, the curing temperature is 210-232°C, and the dry film thickness is controlled at 10-16μm. Then check its performance, see Table 2 for details.

[0039] Table 2 Performance comparison table of insulating and tensile-resistant thermally conductive coatings

[0040] Example insulation Stretch resistance High temperature resistance printability aspect ratio Thermal conductivity (W / m.K) Embodiment one OK OK OK OK 3:1 3.12 Embodiment two OK OK OK OK 2:1 5.08 Embodiment Three OK OK OK OK 2:1 17.42 ...

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PUM

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Abstract

The invention discloses insulating and anti-tensile heat-conducting paint as well as a preparation method and application thereof. The insulating and anti-tensile heat-conducting paint is prepared from the following components in parts by mass: 25 to 30 parts of polyurethane polyol A, 14 to 25 parts of polyurethane polyol B, 20 to 40 parts of a mixed solvent, 0.2 to 1 part of a hyper-dispersant, 1 to 2 parts of an adhesion promoter, 5 to 20 parts of heat conductor powder, 1 to 10 parts of boron nitride, 1 to 20 parts of graphene, 0.1 to 0.3 part of a de-foaming agent, 0.1 to 0.3 part of a flatting agent and 0.1 to 1 part of an anti-sedimentation agent. The preparation method of the insulating and anti-tensile heat-conducting paint comprises the following steps: uniformly dispersing the polyurethane polyol resin A, the polyurethane polyol resin B and the mixed solvent, and mixing the residual components therein; grinding to obtain the insulating and anti-tensile heat-conducting paint. The insulating and anti-tensile heat-conducting paint can be widely applied to lamination of a capacitor aluminum shell. The insulating and anti-tensile heat-conducting paint has good elongation percentage, does not become yellow at high temperature and also has a high heat-conducting property, so that the service life of a capacitor is prolonged.

Description

technical field [0001] The invention belongs to the technical field of heat-conducting paint, and in particular relates to an insulating and stretch-resistant heat-conducting paint and a preparation method and application thereof. Background technique [0002] Electronic products need to be concerned about the power generated when they work, and they must also avoid excessive waste heat generated during the operation of the product equipment, which will cause damage to the product equipment. Therefore, in the application field of heat dissipation, generally use a High-efficiency materials design a heat dissipation unit to conduct waste heat dissipation to maintain the operating temperature of electronic products. If the product is operated within an acceptable temperature range, the device product will have adverse conditions such as poor efficiency, increased energy consumption, and shortened life. If the waste heat can be discharged to cool down, the aforementioned adverse...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D175/04C09D175/06C09D7/61C09D5/25
CPCC08K2003/2227C08K2003/385C08L2201/08C08L2203/20C08L2205/02C08L2205/035C09D5/18C09D7/61C09D7/65C09D175/04C09D175/06C08L75/06C08K13/02C08K3/22C08K3/38C08K3/04C08L75/04
Inventor 张德铭王顺有冯志德刘道义
Owner 江门市德佑金属材料实业有限公司