Release film for heat-conducting silica gel sheet and preparation method thereof

A heat-conducting silica gel sheet and release film technology, which is applied in chemical instruments and methods, adhesives, heat exchange materials, etc., can solve the problems of the decline in the mechanical properties of the silicone oil layer, the shedding of the silicone oil layer, and the inevitable, etc., to improve adhesion, The effect of preventing falling off and improving the reaction speed

Pending Publication Date: 2020-07-03
DONGGUAN DINGLI FILM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] After the heat-conducting silicone sheet is cured and formed, the peel-off release film is attached to the electronic product. The release film is required to have good peeling performance, so the heat-conducting silicone sheet is coated with a thick release film (thickness 2-4Um). Thick coating inevitably leads to uncured silicone oil in the middle part of the silicone oil layer in the release film, resulting in a decrease in the mechanical properties of the silicone oil layer, partial silicone oil layer peeling off, and the uncured part of the silicone oil is prone to oxidation, resulting in oxidation black spots

Method used

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  • Release film for heat-conducting silica gel sheet and preparation method thereof
  • Release film for heat-conducting silica gel sheet and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The preparation method of the release film for the heat-conducting silica gel sheet of the present embodiment, the steps include:

[0025] (1) Add 15 parts of phenyltrichlorosilane, 11 parts of toluene, 11 parts of ethyl acetate, 11 parts of isopropanol, 44 parts of cyclohexane, and 11 parts of acetone into the container and stir evenly. The speed is 1500r / min;

[0026] (2) Add 2 parts of vinyltriethoxysilane, 2 parts of platinum carbon catalyst (platinum content is 3wt%), 1 part of adhesion promoting resin and 4 parts of dialkyldithiocarbamate in the container, Stir well;

[0027] (3) Add 5 parts of modified alkylphenol formaldehyde resin into the container, stir evenly, add 1.5 parts of isomeric tridecanol polyoxyethylene ether and heat the temperature to 40 degrees to obtain a release liquid;

[0028] (4) The surface of the PET substrate is treated with an electric arc to form a rough layer with a thickness of 4um. The release liquid is coated on the surface of the...

Embodiment 2

[0030] The preparation method of the release film for the heat-conducting silica gel sheet of the present embodiment, the steps include:

[0031] (1) Add 10 parts of Dow Corning silicone oil, 9 parts of toluene, 18 parts of ethyl acetate, 10 parts of isopropanol, 24 parts of cyclohexane, and 20 parts of acetone into the container and stir evenly at a stirring speed of 1200r / min;

[0032] (2) Add 4 parts of vinyltriethoxysilane, 1 part of chloroplatinic acid catalyst (platinum content is 3wt%), 1.5 parts of adhesion promoting resin and 8 parts of dialkyldithiocarbamate into the container , stir evenly;

[0033] (3) Add 10 parts of modified alkylphenol formaldehyde resin into the container, stir evenly, add 3 parts of isomeric tridecyl alcohol polyoxyethylene ether and heat the temperature to 60 degrees to obtain a release liquid;

[0034] (4) The surface of the PET base material is treated with an electric arc to form a rough layer with a thickness of 3um. The release liquid...

Embodiment 3

[0036] The preparation method of the release film for the heat-conducting silica gel sheet of the present embodiment, the steps include:

[0037] (1) Add 15 parts of phenyltrichlorosilane, 15 parts of toluene, 15 parts of ethyl acetate, 30 parts of isopropanol, 8 parts of cyclohexane, and 20 parts of acetone into the container and stir evenly. The speed is 1500r / min;

[0038] (2) Add 2 parts of vinyltriethoxysilane, 2 parts of platinum carbon catalyst (platinum content is 3wt%), 1 part of adhesion promoting resin and 4 parts of dialkyldithiocarbamate in the container, Stir well;

[0039] (3) Add 5 parts of modified alkylphenol formaldehyde resin into the container, stir evenly, add 1.5 parts of isomeric tridecanol polyoxyethylene ether and heat the temperature to 40 degrees to obtain a release liquid;

[0040] (4) The surface of the PET substrate is treated with an electric arc to form a rough layer with a thickness of 4um. The release liquid is coated on the surface of the ...

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Abstract

The invention provides a preparation method of a release film for a heat-conducting silica gel sheet. The preparation method comprises the following steps: (1) adding silicone oil and a solvent into acontainer, and carrying out uniform stirring; (2) adding vinyltriethoxysilane, a catalyst, adhesion promoting resin and dialkyl dithiocarbamate into the container; (3) adding modified alkylphenol formaldehyde resin into the container, carrying out stirring, adding iso-tridecanol polyoxyethylene ether, and carrying out heating to 40-60 DEG C to obtain a release liquid; and (4) coating the surfaceof a base material with the release liquid, and carrying out baking and curing to obtain the release film for the heat-conducting silica gel sheet. In the preparation method, the compounding of the dialkyl dithiocarbamate and the silicone oil is improved by virtue of the vinyltriethoxysilane, and the dialkyl dithiocarbamate is used for preventing the uncured part of a silicone oil layer of the release film from being oxidized, so oxidation black spots are avoided. The modified alkylphenol formaldehyde resin is introduced to improve the adhesion between the cured part and the undercured part inthe silicone oil layer of the release film, thereby preventing the undercured part from shedding.

Description

technical field [0001] The invention relates to the technical field of release films, in particular to a release film for a heat-conducting silica gel sheet and a preparation method thereof. Background technique [0002] Thermally conductive silicone sheet is also called thermally conductive silicone pad, thermally conductive silicone sheet, soft thermally conductive pad, including a release film layer, a thermally conductive silica gel layer, and a release film layer. It uses the release film as a carrier, coats the heat-conducting silica gel composite liquid on the release film, and then heat-cures it in a high-temperature oven to form it. The heat-conducting silicone sheet can fill the gap, complete the heat transfer between the heat-generating part and the heat-dissipating part, and also play the role of insulation, shock absorption and sealing, which can meet the design requirements of miniaturization and ultra-thinness of equipment, and is extremely manufacturable and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J7/04C09D183/04C09D5/20C09D7/63C09D7/65C09J7/40C09K5/14C08L67/02C08L23/06C08L27/06
CPCC09D183/04C09D5/20C09D7/63C09D7/65C09D4/00C09J7/401C09K5/14C08J2367/02C08J2323/06C08J2327/06C08L2205/035C08G77/08C09J2483/005C09J2483/00C08L61/14C08L71/02C08L101/00C08K5/39C08K5/5425
Inventor 邓浩鹏
Owner DONGGUAN DINGLI FILM TECH
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