CN110684359A - Silica gel gasket and preparation method thereof - Google Patents
Silica gel gasket and preparation method thereof Download PDFInfo
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- CN110684359A CN110684359A CN201911036255.2A CN201911036255A CN110684359A CN 110684359 A CN110684359 A CN 110684359A CN 201911036255 A CN201911036255 A CN 201911036255A CN 110684359 A CN110684359 A CN 110684359A
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- silicone oil
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L83/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
- C08L83/04—Polysiloxanes
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K5/00—Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
- C09K5/08—Materials not undergoing a change of physical state when used
- C09K5/14—Solid materials, e.g. powdery or granular
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2383/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen, or carbon only; Derivatives of such polymers
- C08J2383/04—Polysiloxanes
- C08J2383/07—Polysiloxanes containing silicon bound to unsaturated aliphatic groups
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2483/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen, or carbon only; Derivatives of such polymers
- C08J2483/04—Polysiloxanes
- C08J2483/05—Polysiloxanes containing silicon bound to hydrogen
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2483/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen, or carbon only; Derivatives of such polymers
- C08J2483/04—Polysiloxanes
- C08J2483/07—Polysiloxanes containing silicon bound to unsaturated aliphatic groups
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/003—Additives being defined by their diameter
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
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Abstract
The invention discloses a silica gel gasket and a preparation method thereof, wherein the silica gel gasket comprises spherical alumina powder, vinyl silicone oil, phenyl vinyl silicone oil, hydrogen-containing silicone oil and a catalyst. According to the invention, the spherical alumina powder is introduced into the silica gel gasket, and the alumina is a heat conduction material, so that the prepared silica gel gasket has good heat conductivity. It can be understood that the technical scheme of the invention can improve the heat conductivity of the silica gel gasket.
Description
Technical Field
The invention relates to the technical field of heat-conducting gaskets, in particular to a silica gel gasket and a preparation method thereof.
Background
With the development of science and technology, the electronic industry and the electrical industry have higher requirements on the service performance of the silica gel gasket. The silica gel gasket is required to have high temperature resistance and insulation, and also has thermal conductivity so as to improve the operation stability and the service life of a device positioned on the silica gel gasket. Then, most of the existing silica gel gaskets use vinyl silicone oil and phenyl vinyl silicone oil as basic silicone oil, and although the high temperature resistance and the insulativity of the silica gel gaskets are ensured, the thermal conductivity of the silica gel gaskets is poor, and the use requirements cannot be met.
Disclosure of Invention
The invention mainly aims to provide a silica gel gasket and aims to improve the heat conductivity of the silica gel gasket.
In order to achieve the purpose, the silica gel gasket provided by the invention comprises spherical alumina powder, vinyl silicone oil, phenyl vinyl silicone oil, hydrogen-containing silicone oil and a catalyst.
Optionally, the spherical alumina powder comprises at least two spherical alumina powders of different particle sizes.
Optionally, the spherical alumina powder comprises 70-120 μm spherical alumina powder, 5-20 μm spherical alumina powder and 0.5-4 μm spherical alumina powder.
Optionally, the mass ratio of the 70-120 μm spherical alumina powder, the 5-20 μm spherical alumina powder and the 0.5-4 μm spherical alumina powder is: (4 to 8), (2 to 5) and (1 to 3).
Optionally, the phenyl vinyl silicone oil has a phenyl content of 15% to 35% of the total weight of the phenyl vinyl silicone oil.
Optionally, the vinyl silicone oil has a vinyl content of 0.2% to 0.8% of the total weight of the vinyl silicone oil.
Optionally, the catalyst is a platinum catalyst.
Optionally, the silica gel gasket comprises, by mass, 75-85% of spherical alumina powder, 3-15% of vinyl silicone oil, 2-10% of phenyl vinyl silicone oil, 1-10% of hydrogen-containing silicone oil and 0.01-2% of a catalyst.
The invention also provides a preparation method of the silica gel gasket, which comprises the following steps:
mixing spherical alumina powder, vinyl silicone oil, phenyl vinyl silicone oil, hydrogen-containing silicone oil and a catalyst to obtain a mixture;
pressing and forming the mixture to obtain a sheet;
and baking the sheet to obtain the silica gel gasket.
Preferably, the step of "baking the sheet" comprises:
and (3) baking the sheet at 120-170 ℃ for 10-30 minutes.
The invention provides a silica gel gasket which comprises spherical alumina powder, vinyl silicone oil, phenyl vinyl silicone oil, hydrogen-containing silicone oil and a catalyst. According to the invention, the spherical alumina powder is introduced into the silica gel gasket, and the alumina is a heat conduction material, so that the prepared silica gel gasket has good heat conductivity. It can be understood that the technical scheme of the invention can improve the heat conductivity of the silica gel gasket.
Meanwhile, in the technical scheme of the invention, compared with the alumina powder in other particle shapes, the spherical alumina powder has higher specific surface area, so that the spherical alumina powder has excellent wettability and is easy to mix in the basic silicone oil of vinyl silicone oil and phenyl vinyl silicone oil, thereby ensuring the molding preparation of the silica gel gasket.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. The examples, in which the specific conditions are not specified, were conducted under the conventional conditions or conditions recommended by the processor. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
The invention provides a silica gel gasket.
In an embodiment of the present invention, a silica gel gasket includes spherical alumina powder, vinyl silicone oil, phenyl vinyl silicone oil, hydrogen-containing silicone oil, and a catalyst.
The invention provides a silica gel gasket which comprises spherical alumina powder, vinyl silicone oil, phenyl vinyl silicone oil, hydrogen-containing silicone oil and a catalyst. According to the invention, the spherical alumina powder is introduced into the silica gel gasket, and the alumina is a heat conduction material, so that the prepared silica gel gasket has good heat conductivity. It can be understood that the technical scheme of the invention can improve the heat conductivity of the silica gel gasket.
The silicone gasket is prepared by taking vinyl silicone oil and phenyl vinyl silicone oil as basic silicone oil, so that the high temperature resistance and the insulativity of the prepared silicone gasket are ensured. Meanwhile, spherical alumina powder is introduced, the alumina has thermal conductivity, and the alumina is an insulating material, so that the silica gel gasket containing the spherical alumina powder has thermal conductivity on the premise of ensuring high temperature resistance and insulativity.
In addition, in the technical scheme of the invention, the spherical alumina powder has a higher specific surface area compared with alumina powder in other particle shapes, so that the spherical alumina powder has excellent wettability and is easy to mix in base silicone oil of vinyl silicone oil and phenyl vinyl silicone oil, thereby ensuring the molding preparation of the silica gel gasket.
In one embodiment of the present invention, the spherical alumina powder comprises at least two spherical alumina powders of different particle sizes. According to the embodiment of the invention, various spherical alumina powders with different particle sizes can be adopted, so that the spherical alumina powders with different particle sizes are filled in the basic silicone oil of the vinyl silicone oil and the phenyl vinyl silicone oil, thereby ensuring the full filling of the spherical alumina powders, improving the accumulation proportion, improving the compactness of the prepared silica gel gasket, and enhancing the thermal conductivity of the silica gel gasket on the premise of ensuring the mechanical property of the prepared silica gel gasket.
In one embodiment of the present invention, the spherical alumina powder includes 70 to 120 μm spherical alumina powder, 5 to 20 μm spherical alumina powder and 0.5 to 4 μm spherical alumina powder. The embodiment of the invention adopts three spherical alumina powders with different grain size grades to fill gaps with different sizes, thereby improving the compactness of the prepared silica gel gasket. Of course, the amount of the spherical alumina powder with three different particle size grades can be properly adjusted in the embodiment of the present invention, and the embodiment of the present invention is not limited thereto, and the above manner is all prepared within the protection scope of the present invention.
In one embodiment of the present invention, the weight ratio of the 70 to 120 μm spherical alumina powder, the 5 to 20 μm spherical alumina powder, and the 0.5 to 4 μm spherical alumina powder is: (4 to 8), (2 to 5) and (1 to 3). According to the embodiment of the invention, the mass ratio of the spherical alumina powder with different particle sizes is adjusted, so that the spherical alumina powder is fully filled, and the thermal conductivity of the silica gel gasket is further improved on the basis of ensuring the mechanical property of the prepared silica gel gasket.
In an embodiment of the present invention, the phenyl group content in the phenyl vinyl silicone oil is 15% to 35% of the total weight of the phenyl vinyl silicone oil. According to the invention, the high temperature resistance of the prepared silica gel gasket is ensured by introducing the vinyl silicone oil with phenyl. Of course, the embodiments of the present invention may use phenyl vinyl silicone oil with different content, and the present invention is not limited thereto, and the above is within the protection scope of the present invention. Preferably, the content of phenyl in the phenyl vinyl silicone oil is 15-35% of the total weight of the phenyl vinyl silicone oil, so that the prepared silica gel gasket has stable high-temperature resistance.
In an embodiment of the present invention, the vinyl silicone oil contains 0.2% to 0.8% of vinyl groups based on the total weight of the vinyl silicone oil. According to the embodiment of the invention, the silicone oil with vinyl is adopted, so that the vinyl silicone oil and the phenyl vinyl silicone oil are subjected to a crosslinking reaction during high-temperature sintering, and a linear silica gel molecular chain is crosslinked to form a three-dimensional network structure, so that the mechanical property of the prepared silica gel gasket is improved.
In an embodiment of the present invention, the catalyst is a platinum catalyst. The platinum catalyst is colorless transparent or light yellow liquid, and mainly takes chloroplatinic acid noble metal as a main raw material active component. According to the embodiment of the invention, the platinum catalyst is adopted to catalyze the crosslinking reaction of the vinyl silicone oil and the phenyl vinyl silicone oil, so that the mechanical property of the prepared silica gel gasket is ensured.
In an embodiment of the invention, the silica gel gasket comprises, by mass, 75-85% of spherical alumina powder, 3-15% of vinyl silicone oil, 2-10% of phenyl vinyl silicone oil, 1-10% of hydrogen-containing silicone oil, and 0.01-2% of a catalyst. The embodiment of the invention controls the mass fraction of each component. On the premise of ensuring the insulativity of the prepared silica gel gasket, on one hand, the high temperature resistance of the silica gel gasket is improved, on the other hand, the heat conductivity of the silica gel gasket is also enhanced, and the use requirements under various special environments are met.
The invention further provides a preparation method of the silica gel gasket, the preparation method of the silica gel gasket comprises the silica gel gasket, the silica gel gasket refers to the embodiment, and all the technical schemes of the embodiment are adopted for the silica gel gasket, so that the silica gel gasket at least has all the beneficial effects brought by the technical schemes of the embodiment, and the details are not repeated. The embodiment of the invention provides a preparation method of a silica gel gasket, which comprises the following steps: mixing spherical alumina powder, vinyl silicone oil, phenyl vinyl silicone oil, hydrogen-containing silicone oil and a catalyst to obtain a mixture; pressing and forming the mixture to obtain a sheet; and baking the sheet to obtain the silica gel gasket. The preparation process of the silica gel gasket is simple and is suitable for large-scale process production. It should be noted that the mixture may be formed by compression using a two-roll calender, or may be directly compressed using a tablet press, and the present invention is not limited thereto, and the above manners are within the scope of the present invention.
In an embodiment of the present invention, the step of "baking the mix sheet" includes: and (3) baking the sheet at 120-170 ℃ for 10-30 minutes. According to the embodiment of the invention, the vinyl silicone oil and the phenyl vinyl silicone oil are fully crosslinked by controlling the baking temperature and the baking time, so that the mechanical property of the prepared silica gel gasket is ensured, and the use requirement is met. Of course, the baking time and the baking temperature may be properly adjusted in the embodiments of the present invention, and the embodiments of the present invention are not limited thereto, and the adjustment of the baking conditions is within the protection scope of the embodiments of the present invention.
Specifically, the preparation method of the silica gel gasket comprises the following steps: adding spherical alumina powder, vinyl silicone oil, phenyl vinyl silicone oil, hydrogen-containing silicone oil and platinum catalyst into a stirrer in sequence, and stirring and mixing to obtain a mixture; transferring the mixture to a two-roll calender for compression molding to obtain a sheet; and baking the sheet at 120-170 ℃ for 10-30 minutes to obtain the silica gel gasket.
The technical solution of the present invention is further described below with reference to specific examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the scope of the invention.
Example 1
A silica gel gasket comprises, by mass, 80 parts of spherical alumina powder, 8 parts of vinyl silicone oil, 9 parts of phenyl vinyl silicone oil, 2 parts of hydrogen-containing silicone oil and 1 part of platinum catalyst.
A preparation method of a silica gel gasket comprises the following steps: adding spherical alumina powder, vinyl silicone oil, phenyl vinyl silicone oil, hydrogen-containing silicone oil and platinum catalyst into a stirrer in sequence, and stirring and mixing to obtain a mixture; transferring the mixture to a two-roll calender for compression molding to obtain a sheet; the sheet was baked at 165 ℃ for 15 minutes to obtain a silica gel pad.
Example 2
A silica gel gasket comprises, by mass, 75 parts of spherical alumina powder, 13 parts of vinyl silicone oil, 7 parts of phenyl vinyl silicone oil, 3.5 parts of hydrogen-containing silicone oil and 1.5 parts of platinum catalyst.
A preparation method of a silica gel gasket comprises the following steps: adding spherical alumina powder, vinyl silicone oil, phenyl vinyl silicone oil, hydrogen-containing silicone oil and platinum catalyst into a stirrer in sequence, and stirring and mixing to obtain a mixture; transferring the mixture to a two-roll calender for compression molding to obtain a sheet; the sheet was baked at 150 ℃ for 25 minutes to obtain a silica gel pad.
The silica gel gasket prepared in the embodiment 1-2 of the invention is subjected to heat conductivity coefficient detection, high temperature resistance detection and insulation detection in sequence, and the silica gel gasket prepared in the embodiment 1-2 of the invention is obtained to have the heat conductivity coefficient of 1.0-3.0W/mk, the insulation strength of 6-10 kV/mm, and the surface of the silica gel gasket is not cracked and disassembled after the silica gel gasket is heated at 250 ℃ for 1000 hours. Therefore, the silica gel gasket prepared by the embodiment of the invention has high insulating strength, good high temperature resistance and good heat conducting property, and meets the use requirements.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the present specification and directly/indirectly applied to other related technical fields within the spirit of the present invention are included in the scope of the present invention.
Claims (10)
1. The silica gel gasket is characterized by comprising spherical alumina powder, vinyl silicone oil, phenyl vinyl silicone oil, hydrogen-containing silicone oil and a catalyst.
2. The silicone gel gasket of claim 1, wherein the spherical alumina powder comprises at least two different particle sizes of spherical alumina powders.
3. The silica gel pad of claim 2, wherein the spherical alumina powder comprises 70 to 120 μm spherical alumina powder, 5 to 20 μm spherical alumina powder, and 0.5 to 4 μm spherical alumina powder.
4. The silica gel gasket of claim 3, wherein the 70 to 120 μm spherical alumina powder, the 5 to 20 μm spherical alumina powder, and the 0.5 to 4 μm spherical alumina powder are in a mass ratio of: (4 to 8), (2 to 5) and (1 to 3).
5. The silicone gel gasket according to any one of claims 1 to 4, wherein the phenyl vinyl silicone oil has a phenyl group content of 15% to 35% by weight based on the total weight of the phenyl vinyl silicone oil.
6. The silicone gel gasket of any one of claims 1 to 4, wherein the vinyl silicone oil has a vinyl group content of 0.2% to 0.8% of the total weight of the vinyl silicone oil.
7. The silica gel pad of any one of claims 1-4, wherein the catalyst is a platinum catalyst.
8. The silica gel gasket according to any one of claims 1 to 4, wherein the silica gel gasket comprises, in mass fraction, 75 to 85% of spherical alumina powder, 3 to 15% of vinyl silicone oil, 2 to 10% of phenyl vinyl silicone oil, 1 to 10% of hydrogen-containing silicone oil, and 0.01 to 2% of a catalyst.
9. The preparation method of the silica gel gasket according to any one of claims 1 to 8, comprising the steps of:
mixing spherical alumina powder, vinyl silicone oil, phenyl vinyl silicone oil, hydrogen-containing silicone oil and a catalyst to obtain a mixture;
pressing and forming the mixture to obtain a sheet;
and baking the sheet to obtain the silica gel gasket.
10. The method for preparing a silicone gasket of claim 9, wherein the step of baking the sheet comprises:
and (3) baking the sheet at 120-170 ℃ for 10-30 minutes.
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| CN201911036255.2A CN110684359A (en) | 2019-10-28 | 2019-10-28 | Silica gel gasket and preparation method thereof |
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| CN201911036255.2A CN110684359A (en) | 2019-10-28 | 2019-10-28 | Silica gel gasket and preparation method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111635636A (en) * | 2020-06-29 | 2020-09-08 | 佛山(华南)新材料研究院 | Preparation method of anti-aging high-thermal-conductivity gasket |
| CN113004703A (en) * | 2021-03-16 | 2021-06-22 | 苏州汇美包装制品有限公司 | High-thermal-conductivity and high-resilience heat-conducting silica gel pad and preparation method thereof |
| CN113122003A (en) * | 2019-12-31 | 2021-07-16 | 广东美的白色家电技术创新中心有限公司 | Flexible heat-conducting insulating material and preparation method and application thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113122003A (en) * | 2019-12-31 | 2021-07-16 | 广东美的白色家电技术创新中心有限公司 | Flexible heat-conducting insulating material and preparation method and application thereof |
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| CN111635636A (en) * | 2020-06-29 | 2020-09-08 | 佛山(华南)新材料研究院 | Preparation method of anti-aging high-thermal-conductivity gasket |
| CN113004703A (en) * | 2021-03-16 | 2021-06-22 | 苏州汇美包装制品有限公司 | High-thermal-conductivity and high-resilience heat-conducting silica gel pad and preparation method thereof |
| CN113004703B (en) * | 2021-03-16 | 2022-04-08 | 苏州汇美包装制品有限公司 | High-thermal-conductivity and high-resilience heat-conducting silica gel pad and preparation method thereof |
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