CN108859324A - Insulating silicone gasket and its preparation method and equipment - Google Patents

Abstract

The insulating silica gel gasket is formed by compounding an upper heat-conducting adhesive layer, a middle alkali-free glass fiber cloth layer and a lower heat-conducting adhesive layer, wherein the upper heat-conducting adhesive layer and the lower heat-conducting adhesive layer are formed by compounding silicon rubber, boron nitride and an auxiliary agent, the thicknesses of the upper heat-conducting adhesive layer and the lower heat-conducting adhesive layer are respectively 0.02-0.4 mm, and the thickness of the middle alkali-free glass fiber cloth layer is 0.01-0.2 mm. The invention also discloses a preparation method and equipment of the insulating silica gel gasket. According to the insulating silica gel gasket, the boron nitride is used as the main filler, the alkali-free glass fiber layer is compounded in the middle of the boron nitride, the insulating silica gel gasket with the thickness of 0.1-0.5 mm is obtained, when the breakdown voltage is larger than 3KV, the heat conduction effect is good, the heat dissipation efficiency is high, a large amount of high-heat-conduction fillers are not required to be added, the organic silicon high-molecular structure is not damaged, and the processing and forming are convenient. In addition, the two-section double-coating-head coating device can be used for directly preparing the insulating silica gel gasket, and the insulating silica gel gasket is formed by hot pressing through a mould press, so that the equipment structure is simple, and the production efficiency is high.

Description

Insulating silicone gasket and its preparation method and equipment

【Technical field】

The invention relates to an insulating silica gel material, in particular to an insulating silica gel gasket which has high heat dissipation efficiency, is easy to form, and can be used as a thermal interface material of electronic equipment, and a preparation method and equipment thereof.

【Background technique】

With the development of electronic information technology, electronic equipment is becoming more and more miniaturized, and electronic equipment will generate heat more or less during use. If the excess heat cannot be dissipated in time, it will not only affect the product performance of electronic equipment, but also Its service life is also seriously threatened. As an integral part of electronic equipment, insulating silicone gasket not only plays an insulating role, but also requires a good heat dissipation effect. The existing insulating silicone gasket heat conduction materials usually use alumina as heat conduction filler. When the thickness is less than 0.5 mm and the breakdown voltage is greater than 3KV, the thermal conductivity is usually lower than 2W/m*K, which cannot meet the heat dissipation requirements of electronic equipment. need. In order to achieve high thermal conductivity, a large amount of boron nitride high-heat filler must be added, and this thermal conductivity material can severely damage the structure of silicone polymer materials and cannot be molded. Therefore, how to provide an insulating silicone gasket with high heat dissipation efficiency and easy molding, so that it can be used as a thermal interface material of electronic equipment has become an objective demand.

【Content of invention】

The present invention aims to solve the above problems, and provides an insulating silicone gasket with high heat dissipation efficiency, easy molding, and can be used as thermal interface material of electronic equipment.

The invention also provides a preparation method of the insulating silica gel gasket.

The invention also provides a device for preparing the insulating silica gel gasket.

In order to achieve the purpose of the present invention, the present invention provides an insulating silica gel gasket, which is composed of an upper thermally conductive adhesive layer, a middle alkali-free glass fiber cloth layer and a lower thermally conductive adhesive layer. The layer is compounded by silicon rubber, boron nitride and additives, and its thickness is 0.02-0.4 mm, and the thickness of the middle non-alkali glass fiber cloth layer is 0.01-0.2 mm.

The upper and lower thermally conductive adhesive layers include the following components in parts by weight:

The silicone rubber is one or a combination of methyl vinyl silicone rubber, methylphenyl silicone rubber, fluorosilicone rubber or dimethyl silicone rubber.

The weight ratio of the silicone rubber to boron nitride is less than or equal to 1:1, the particle size of the boron nitride is 0.01-100 microns, and the impurity content is less than 0.1%.

The solvent is one or a combination of toluene, xylene, ethyl acetate, lipid organic solvents or phenyl organic solvents, and the coupling agent is a silane coupling agent or titanate coupling agent One or a combination thereof, the silicone vulcanizing agent is a mixture of organic peroxide or hydrogen-containing silicone oil and a platinum-containing catalyst, and the other heat-conducting powders are aluminum nitride, aluminum oxide, magnesium oxide, zinc oxide, One or more mixtures of silicon nitride, silicon dioxide or aluminum hydroxide.

The present invention also provides a method for preparing an insulating silica gel gasket, the method comprising the steps of:

a. Add boron nitride and additives after dissolving the silicone rubber, stir evenly and let stand for 1 to 3 hours to obtain thermally conductive silica gel;

b. Coat the heat-conducting silica gel on the release film through a coating device, then compound the heat-conducting silica gel with the middle non-alkali glass fiber cloth, dry it at a temperature of 60-80°C for 3-8 minutes, and then dry it in an alkali-free Coat heat-conducting silica gel on the glass fiber cloth, dry it at 60-80°C for 3-8 minutes, and then form it to obtain a semi-finished product;

c. Cutting the semi-finished product obtained in step b into sheets, then covering the surface with a release film, and then hot-pressing in a molding device, and tearing off the release film to obtain the insulating silicone gasket.

In step b and step c, the release film is polytetrafluoroethylene glass fiber cloth, fluorine PET release film or fluorine-containing release material.

The present invention also provides a kind of equipment for preparing insulating silica gel gasket, the equipment includes a coating device and a molding device, the coating device is a two-stage double-coating head coating device, which is sequentially provided with a first unwinding machine, the first coating head, the second unwinding machine, composite rolls, the first drying equipment, the second coating head, the second drying equipment and the fixed-length cutting device, the first unwinding machine unwinds release film, the second unwinding machine unwinds the alkali-free glass fiber cloth, the first coating head and the second coating head are coated with heat-conducting silica gel, and the first coating head and the second unwinding The machine and the composite roll are respectively set above the release film, and the second coating head is set above the alkali-free glass fiber cloth.

The molding device is a flat molding machine, which is provided with a base, a hydraulic column, and an upper die head and a lower die head that can be heated and pressurized. One end of the hydraulic column is fixed on the base, and the other end drives the lower die head to move up and down. Buffer layers are respectively provided at the contact ends of the upper die head and the lower die head.

The molding pressure of the upper die head and the lower die head is greater than or equal to 10 MPa.

The contribution of the present invention is that it effectively solves the problem that the thermal interface material of the existing electronic equipment has low thermal conductivity and cannot be molded. The insulating silica gel gasket of the present invention uses boron nitride as the main filler and is compounded with an alkali-free glass fiber layer in the middle to obtain an insulating silica gel gasket with a thickness of 0.1-0.5mm. When the breakdown voltage is greater than 3KV, the thermal conductivity Good, the heat dissipation efficiency is high, and there is no need to add a large amount of high thermal conductivity filler, the structure of the silicone polymer is not damaged, and the processing and molding are convenient. In addition, the present invention can directly prepare insulating silicone gaskets through a two-stage double-coating head coating device, and heat-press molding by a molding machine, with simple equipment structure and high production efficiency.

【Description of drawings】

Fig. 1 is a structural schematic diagram of the present invention.

Fig. 2 is a schematic structural view of the coating device of the present invention.

Fig. 3 is a schematic structural view of the molding device of the present invention.

【Detailed ways】

Referring to Fig. 1, the insulating silica gel gasket of the present invention is composed of upper and lower heat-conducting silica gel layers 10A, 10B and the middle alkali-free glass fiber cloth layer 20 through a coating device 30 and a molding device 40, wherein the upper and lower layers of heat-conducting silica gel Layers 10A and 10B are compounded by silicone rubber, boron nitride and additives, and the weight ratio of silicone rubber to boron nitride is less than or equal to 1:1, the particle size of boron nitride is 0.01-100 microns, and the impurity content is less than 0.1% , additives include solvents, coupling agents, vulcanizing agents and other thermally conductive powders, such as one or more of aluminum nitride, aluminum oxide, magnesium oxide, zinc oxide, silicon nitride, silicon dioxide or aluminum hydroxide The thickness of the mixture is 0.02-0.4 millimeters, the thickness of the middle non-alkali glass fiber cloth layer 20 is 0.01-0.2 millimeters, and the total thickness of the obtained insulating silicone gasket is 0.1-0.5 millimeters.

The preparation method of the insulating silicone gasket is as follows: firstly dissolve the silicone rubber in a solvent, stir evenly, add boron nitride and other heat-conducting powder, vulcanizing agent and coupling agent, stir evenly, and let it stand for 1 to 3 hours. Get thermal silicone. Then, the stirred thermally conductive silica gel is coated on the release film through the coating device 30, wherein the thickness of the coated thermally conductive silica gel is controlled by a scraper. Then compound the heat-conducting silica gel with the middle non-alkali glass fiber cloth, and dry it at a temperature of 60-80°C for 3-8 minutes, then coat the heat-conducting silica gel on the non-alkali glass fiber cloth, and place it at a temperature of 60-80°C After drying for 3 to 8 minutes, it is molded to obtain a semi-finished product. The semi-finished product is cut into sheets, and then the surface is covered with a release film, and then hot-pressed in the molding device 40, and the insulating silicone gasket is obtained after the release film is torn off. Wherein, the release film is polytetrafluoroethylene glass fiber cloth, fluorine PET release film or fluorine-containing release material.

As shown in Figure 2, the coating device 30 is a two-stage double-coating head coating device, which is successively provided with a first unwinder 31, a first coating head 32, a second unwinder 33, and a compound roll 34 , the first drying equipment 35, the second coating head 36, the second drying equipment 37 and the fixed-length cutting device 38, wherein, the first unwinding machine 31 is used for unwinding the release film, and the second unwinding machine 33 is used to unwind the non-alkali glass fiber cloth, the first coating head 32 is used to coat the thermally conductive silica gel on the release film, and the second coating head 33 is used to coat the thermally conductive silica gel on the non-alkali glass fiber cloth , the composite roller 34 is used to compound the alkali-free glass fiber cloth and the heat-conducting silica gel, and the first coating head 32, the second unwinding machine 33 and the composite roller 34 are respectively arranged above the release film, and the second coating head is located at Above the alkali-free glass fiber cloth. The first drying equipment 35 and the second drying equipment 37 are ovens, and the cut-to-length device 38 is a cutting machine. The specific working process is: the release film is placed on the first unwinder 31, the alkali-free glass fiber is arranged on the second unwinder 33, the first unwinder 31 is started, and the release film is unfolded on the first coating Below the cloth head 32, the first coating head 32 coats the thermally conductive silica gel on the release film to obtain the lower thermally conductive adhesive layer 10B, and then starts the second unwinding machine 33, so that the alkali-free glass fiber cloth passes through the compound roller 34 and the lower layer. The thermally conductive adhesive layer is compounded to obtain the middle non-alkali glass fiber layer 20, and the compounded lower thermally conductive adhesive layer 10B and the middle non-alkali glass fiber layer 20 are placed in the first drying device 35 at a temperature of 60-80°C and dried for 3 ~ 8 minutes, then the second coating head 36 coats the thermally conductive silica gel on the non-alkali glass fiber cloth to obtain the upper thermally conductive silica gel layer 10A, then the upper thermally conductive silica gel layer 10A, the middle non-alkali glass fiber layer 20 and the lower thermally conductive adhesive The layer 10B is dried in the second drying equipment 37 at a temperature of 60-80° C. for 3-8 minutes, and finally cut to the required length by the cut-to-length cutting device 38 to obtain a semi-finished insulating silicone gasket.

As shown in FIG. 3 , the molding device 40 is used for thermoforming the semi-finished insulating silicone gasket, which is a flat molding machine. The molding machine 40 is provided with a base 41, a hydraulic column 42, an upper die 43 and a lower die 44, wherein one end of the hydraulic column 42 is fixed on the base 41, and the other end drives the lower die 44 to move up and down, and the upper die 43 and the lower die head 44 can be heated and pressurized, and the molding pressure of the upper die head 43 and the lower die head 44 is greater than or equal to 10MPa, and the contact ends of the upper die head 43 and the lower die head 44 are respectively provided with a buffer layer 45, which can make The insulating silicone gasket placed between the upper die head 43 and the lower die head 44 is evenly heated and pressed to ensure uniform thickness and thermal conductivity of the insulating silicone gasket. When working, cover the semi-finished insulating silicone gasket with a layer of release film, place it between the upper die head 43 and the lower die head 44, set the temperature and pressure of the molding machine, and heat-press the semi-finished insulating silicone gasket , and then tear off the release film on the upper and lower layers to obtain an insulating silicone gasket.

The prepared insulating silicone gasket was tested for thickness, breakdown voltage, thermal conductivity and tensile strength. Among them, the thickness test standard was ASTM D374, the breakdown voltage test standard was ASTM D149, the thermal conductivity test standard was ASTMD5470, and the tensile strength test standard was ASTM D374. The strength test standard is: ASTM D412.

The following examples are further explanations and supplements to the present invention, and do not constitute any limitation to the present invention.

Example 1

Place 5 kg of methyl vinyl silicone rubber in 10 kg of xylene solvent and stir for 2 hours to fully dissolve the silicone rubber, then add 0.1 kg of silane coupling agent A-151, 12 kg of boron nitride, 2 One kilogram of aluminum oxide and 0.1 kilogram of dichlorobenzoyl peroxide (trade name: double two four) were stirred for 1 hour to make them uniform, and then stirred for 15 minutes to obtain thermally conductive silica gel. The thermally conductive silica gel is left to stand for 1 hour, and the thermally conductive silica gel is coated on the polytetrafluoroethylene glass fiber cloth with a width of 300 mm at the first coating head 32 on the coating device 30, and the coating width is controlled to be 200 mm. , the thickness is 0.2 mm, and then the non-alkali glass fiber cloth (commodity model is 1080) with a thickness of 0.1 mm is compounded by the compounding roller 34, and the compounded non-alkali glass fiber is arranged in the first drying equipment 35 with a temperature of 70 ° C. Dry in medium for 5 minutes. Then, the thermally conductive silica gel is coated on the dried alkali-free glass fiber cloth by the second coating head 36, and the control coating width is 200 millimeters, and the total thickness is 0.5 millimeters, and placed in the second drying oven at 70 ° C. Dry 5 minutes in drying equipment 37. It is then cut into a fixed length of 300 millimeters with a fixed-length cutting device 38 to obtain a semi-finished product. Then cover a layer of polytetrafluoroethylene glass fiber cloth on the surface of the semi-finished product, and then set the pressure of the molding machine to 50MPa, and the temperature of the upper die head 43 and the lower die head 44 to be 150°C, which will be covered with polytetrafluoroethylene glass fiber cloth. Arranged between the upper die head 43 and the lower die head 44 of the molding press for pressing for 5 minutes. Then tear off the upper and lower layers of polytetrafluoroethylene fiberglass cloth to obtain insulating silicone gaskets.

The thickness, breakdown voltage, thermal conductivity and tensile strength of the obtained insulating silicone gasket were tested, and the test results are shown in Table 1.

Example 2

Place 5 kg of methyl vinyl silicone rubber in 10 kg of xylene solvent and stir for 2 hours to fully dissolve the silicone rubber, then add 0.1 kg of silane coupling agent A-151, 15 kg of boron nitride, 2 One kilogram of magnesia and 0.1 kilogram of dichlorobenzoyl peroxide (trade name: double two four) were stirred for 1 hour to make them uniform, and then stirred for 15 minutes to obtain thermally conductive silica gel. The thermally conductive silica gel was left to stand for 1 hour, and the thermally conductive silica gel was coated on the polytetrafluoroethylene fiberglass cloth with a width of 400 mm at the first coating head 32 on the coating device 30, and the coating width was controlled to be 300 mm. , the thickness is 0.3 mm, and then the non-alkali glass fiber cloth (commercial model is 104) with a thickness of 0.05 mm is compounded by the composite roller 34, and the composite non-alkali glass fiber is arranged in the first drying equipment 35 with a temperature of 70 ° C. Dry in medium for 5 minutes. Then by the second coating head 36, the heat-conducting silica gel is coated on the dried alkali-free glass fiber cloth, and the control coating width is 300 millimeters, and the total thickness is 0.6 millimeters, and placed in the second drying oven with a temperature of 70 ° C. Dry 5 minutes in drying equipment 37. It is then cut into a fixed length of 300 millimeters with a fixed-length cutting device 38 to obtain a semi-finished product. Then cover a layer of polytetrafluoroethylene glass fiber cloth on the surface of the semi-finished product, and then set the pressure of the molding machine to 60MPa, and the temperature of the upper die head 43 and the lower die head 44 to be 140°C, which will be covered with polytetrafluoroethylene glass fiber cloth. Arranged between the upper die head 43 and the lower die head 44 of the molding press for pressing for 5 minutes. Then tear off the upper and lower layers of polytetrafluoroethylene fiberglass cloth to obtain insulating silicone gaskets.

The thickness, breakdown voltage, thermal conductivity and tensile strength of the obtained insulating silicone gasket were tested, and the test results are shown in Table 1.

Example 3

Put 5 kg of fluorosilicone rubber in 10 kg of xylene solvent and stir for 2 hours to fully dissolve the silicone rubber, then add 0.1 kg of silane coupling agent A-151, 25 kg of boron nitride and 0.1 kg of diphenhydramine Dichlorobenzoyl peroxide (trade name: Shuang24) was stirred for 1 hour to make it uniform, and then stirred for 15 minutes to obtain thermally conductive silica gel. The thermally conductive silica gel was left to stand for 1 hour, and the thermally conductive silica gel was coated on the polytetrafluoroethylene fiberglass cloth with a width of 400 mm at the first coating head 32 on the coating device 30, and the coating width was controlled to be 300 mm. , the thickness is 0.3 mm, and then the non-alkali glass fiber cloth (product model is 104) with a thickness of 0.1 mm is compounded by the compounding roller 34, and the compounded non-alkali glass fiber is arranged in the first drying equipment 35 with a temperature of 70 ° C. Dry in medium for 5 minutes. Then by the second coating head 36, the heat-conducting silica gel is coated on the dried alkali-free glass fiber cloth, and the control coating width is 300 millimeters, and the total thickness is 0.5 millimeters, and placed in the second drying oven at 70 ° C. Dry 5 minutes in drying equipment 37. It is then cut into a fixed length of 300 millimeters with a fixed-length cutting device 38 to obtain a semi-finished product. Then cover a layer of polytetrafluoroethylene glass fiber cloth on the surface of the semi-finished product, and then set the pressure of the molding machine to 60MPa, and the temperature of the upper die head 43 and the lower die head 44 to be 140°C, which will be covered with polytetrafluoroethylene glass fiber cloth. Arranged between the upper die head 43 and the lower die head 44 of the molding press for pressing for 5 minutes. Then tear off the upper and lower layers of polytetrafluoroethylene fiberglass cloth to obtain insulating silicone gaskets.

The thickness, breakdown voltage, thermal conductivity and tensile strength of the obtained insulating silicone gasket were tested, and the test results are shown in Table 1.

Example 4

Place 5 kg of methyl vinyl silicone rubber in 15 kg of toluene solvent and stir for 2 hours to fully dissolve the silicone rubber, then add 0.05 kg of titanate coupling agent, 30 kg of boron nitride and 0.5 kg of The mixture of hydrogen silicone oil and chloroplatinic acid was stirred for 1 hour to make it uniform, and then stirred for 15 minutes to obtain thermally conductive silica gel. The thermally conductive silica gel was left to stand for 2 hours, and the thermally conductive silica gel was coated on the fluorine PET release film with a width of 400 mm at the first coating head 32 on the coating device 30, and the coating width was controlled to be 300 mm. The thickness is 0.15 mm, and then the non-alkali glass fiber cloth (the product model is 104) with a thickness of 0.02 mm is compounded by the compounding roller 34, and the compounded non-alkali glass fiber is arranged in the first drying device 35 with a temperature of 60 ° C. Let dry for 8 minutes. Then by the second coating head 36, the heat-conducting silica gel is coated on the dried alkali-free glass fiber cloth, and the control coating width is 300 millimeters, and the total thickness is 0.4 millimeters, and placed in the second drying oven at 60 ° C. Dry in the drying equipment 37 for 8 minutes. It is then cut into a fixed length of 300 millimeters with a fixed-length cutting device 38 to obtain a semi-finished product. Then cover a layer of fluorine PET release film on the surface of the semi-finished product, and then set the pressure of the molding machine to 60MPa, and the temperature of the upper die head 43 and the lower die head 44 to be 140°C. Press between the upper die head 43 and the lower die head 44 of the molding press for 5 minutes. Then tear off the upper and lower layers of fluorine PET release film to obtain insulating silicone gaskets.

The thickness, breakdown voltage, thermal conductivity and tensile strength of the obtained insulating silicone gasket were tested, and the test results are shown in Table 1.

Example 5

Place 5 kg of methylphenyl silicone rubber in 12.5 kg of xylene solvent and stir for 2 hours to fully dissolve the silicone rubber, then add 0.625 kg of silane coupling agent A-151, 11.25 kg of boron nitride, 6.25 A mixture of 1 kg of aluminum hydroxide and 0.625 kg of hydrogen-containing silicone oil and chloroplatinic acid was stirred for 1 hour to make it uniform, and then stirred for 15 minutes to obtain thermally conductive silica gel. The thermally conductive silica gel was left to stand for 3 hours, and the thermally conductive silica gel was coated on the polytetrafluoroethylene fiberglass cloth with a width of 400 mm at the first coating head 32 on the coating device 30, and the coating width was controlled to be 300 mm. , the thickness is 0.4 mm, and then the non-alkali glass fiber cloth (commercial model is 104) with a thickness of 0.02 mm is compounded by the composite roller 34, and the composite non-alkali glass fiber is arranged in the first drying equipment 35 with a temperature of 80 ° C. Dry on medium for 3 minutes. Then by the second coating head 36, the heat-conducting silica gel is coated on the dried alkali-free glass fiber cloth, and the control coating width is 300 millimeters, and the total thickness is 0.44 millimeters, and placed in a second drying oven with a temperature of 80 ° C. Dry 3 minutes in drying equipment 37. It is then cut into a fixed length of 300 millimeters with a fixed-length cutting device 38 to obtain a semi-finished product. Then cover a layer of polytetrafluoroethylene glass fiber cloth on the surface of the semi-finished product, and then set the pressure of the molding machine to 60MPa, and the temperature of the upper die head 43 and the lower die head 44 to be 140°C, which will be covered with polytetrafluoroethylene glass fiber cloth. Arranged between the upper die head 43 and the lower die head 44 of the molding press for pressing for 5 minutes. Then tear off the upper and lower layers of polytetrafluoroethylene fiberglass cloth to obtain insulating silicone gaskets.

The thickness, breakdown voltage, thermal conductivity and tensile strength of the obtained insulating silicone gasket were tested, and the test results are shown in Table 1.

The thickness, breakdown voltage, thermal conductivity and tensile strength of the obtained insulating silicone gasket were tested, and the test results are shown in Table 1.

comparative example

10 kilograms of methyl vinyl, 30 kilograms of aluminum oxide with an average particle diameter of 45 microns and 15 kilograms of aluminum oxide with an average particle diameter of 5 microns were stirred uniformly in a kneader. After the material is cooled for 4 hours, add 300 grams of double-two-four solidifying agent (Aksu trade name OPC-IP-50S-PS) in the two-roller mill, and start refining for 30 minutes. The rubber material was calendered on the upper and lower sides of 0.02 mm alkali-free glass fiber cloth (commercial model 104) using a three-roller calender to obtain an insulating silicone gasket.

Test items Example 1 Example 2 Example 3 Example 4 Example 5 comparative example Thickness (mm) 0.3 0.4 0.35 0.2 0.3 0.25 Breakdown voltage AC(KV) 6 7 6 4.5 5 4 Thermal conductivity (W/m*K) 2.7 3.2 4.5 3.5 4.0 1.8 Tensile strength (MPa) 18 10 15 14 16 10

Accordingly, the insulating silica gel gasket of the present invention uses boron nitride as the main filler and is compounded with an alkali-free glass fiber layer in the middle to obtain an insulating silica gel gasket with a thickness of 0.1-0.5 mm. When the breakdown voltage is greater than 3KV , good thermal conductivity, high heat dissipation efficiency, and no need to add a large amount of high thermal conductivity fillers, the silicone polymer structure is not damaged, and the processing and molding is convenient. In addition, the present invention can directly prepare insulating silicone gaskets through a two-stage double-coating head coating device, and heat-press molding by a molding machine, with simple equipment structure and high production efficiency.

Although the present invention has been disclosed through the above embodiments, the protection scope of the present invention is not limited thereto. Under the condition of not departing from the concept of the present invention, the deformation, replacement, etc. of the above components will fall into the scope of the present invention. within the scope of the claims.

Claims (10)

1. a kind of insulation silica gel pad, which is characterized in that the gasket is by upper heat-conducting glue layer (10A), intermediate alkali-free glass fiber layer of cloth (20) and lower heat-conducting glue layer (10B) is combined, and the upper and lower heat-conducting glue layer (10A, 10B) is by silicon rubber, boron nitride and auxiliary agent Be combined, thickness is respectively 0.02~0.4 millimeter, the intermediate alkali-free glass fiber layer of cloth (20) with a thickness of 0.01~0.2 Millimeter.

2. insulation silica gel pad as described in claim 1, which is characterized in that the upper and lower heat-conducting glue layer (10A, 10B) includes Following component based on parts by weight：

3. as claimed in claim 2 insulation silica gel pad, which is characterized in that the silicon rubber be methyl vinyl silicone rubber, The mixture of one or more of methyl phenyl silicone rubber, fluorine silicone rubber.

4. insulation silica gel pad as claimed in claim 2, which is characterized in that the weight ratio of the silicon rubber and boron nitride is less than Equal to 1:1, the boron nitride granularity is 0.01~100 micron, and impurity content is lower than 0.1%.

5. insulation silica gel pad as claimed in claim 2, which is characterized in that the solvent is toluene, dimethylbenzene, acetic acid second The mixture of one or more of ester, lipid organic solvent or phenyl organic solvent, the coupling agent be silane coupling agent or One of titanate coupling agent or and combinations thereof, the organosilicon vulcanizing agent is organic peroxide or containing hydrogen silicone oil and platiniferous The mixture of catalyst, other described conduction powders are aluminium nitride, aluminium oxide, magnesia, zinc oxide, silicon nitride, silica Or the mixture of one or more of aluminium hydroxide.

6. a kind of preparation method of insulation silica gel pad as described in claim 1, which is characterized in that this method includes following step Suddenly：

A, boron nitride and auxiliary agent are added after dissolving silicon rubber, stands 1~3 hour after mixing evenly, obtains heat conductive silica gel；

B, heat conductive silica gel is coated on release film by apparatus for coating (30), it is then that heat conductive silica gel and intermediate alkali-free glass is fine It is compound to tie up cloth, being placed in temperature is to dry 3~8 minutes at 60~80 DEG C, then heat conductive silica gel is coated on alkali-free glass fiber cloth, is set It is formed after being to be dried 3~8 minutes at 60~80 DEG C in temperature, is cut into sheet material, obtain semi-finished product；

C, the surfaces of semi-finished product obtained in step b is covered into release film, then in molding device (40) it is hot-forming, tear from The insulation silica gel pad is obtained after type film.

7. method as claimed in claim 6, which is characterized in that in step b and step c, the release film is polytetrafluoroethylene (PTFE) Glass-fiber-fabric, fluorine element PET release film or fluorine-containing separated type material.

8. a kind of equipment for preparing insulation silica gel pad described in claim 1, which is characterized in that the equipment includes apparatus for coating (30) and molding device (40), the apparatus for coating (30) is the double coating head apparatus for coating of two-part, be successively arranged unreel from The first unreeling machine (31) of type film, the first coating head (32), the second unreeling machine (33), the composite roll for unreeling alkali-free glass fiber cloth (34), the first drying equipment (35), the second coating head (36), the second drying equipment (37) and fixed length cutting means (38), it is described First coating head (32), the second coating head (33) are coated with heat conductive silica gel, and first coating head (32), the second unreeling machine (33) And composite roll (34) is respectively arranged on above release film, second coating head is set to above alkali-free glass fiber cloth.

9. equipment as claimed in claim 8, which is characterized in that the molding device (40) is tabular moulding press, is equipped with Pedestal (41), hydraulic column (42) and the upper die head (43) of pressurization, lower die head (44) can be heated, described hydraulic column (42) one end is fixed In on pedestal (41), the other end drives lower die head (44) to move up and down, in the upper die head (43), the contact jaw of lower die head (44) It is respectively equipped with cache layer (45).

10. equipment as claimed in claim 9, which is characterized in that the upper die head (43), the molding combined pressure of lower die head (44) are strong More than or equal to 10MPa.