CN117264420A - Heat-conducting wave-absorbing gasket material - Google Patents
Heat-conducting wave-absorbing gasket material Download PDFInfo
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- CN117264420A CN117264420A CN202210870177.1A CN202210870177A CN117264420A CN 117264420 A CN117264420 A CN 117264420A CN 202210870177 A CN202210870177 A CN 202210870177A CN 117264420 A CN117264420 A CN 117264420A
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- gasket material
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- silicone oil
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- 239000000463 material Substances 0.000 title claims abstract description 38
- 239000002131 composite material Substances 0.000 claims abstract description 46
- 239000011358 absorbing material Substances 0.000 claims abstract description 40
- 239000000945 filler Substances 0.000 claims abstract description 39
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 27
- 239000002994 raw material Substances 0.000 claims abstract description 24
- 229920002545 silicone oil Polymers 0.000 claims abstract description 24
- 239000000084 colloidal system Substances 0.000 claims abstract description 22
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims abstract description 20
- 229910010271 silicon carbide Inorganic materials 0.000 claims abstract description 20
- 239000010445 mica Substances 0.000 claims abstract description 18
- 229910052618 mica group Inorganic materials 0.000 claims abstract description 18
- 239000000843 powder Substances 0.000 claims abstract description 18
- 229920002301 cellulose acetate Polymers 0.000 claims abstract description 16
- 238000003756 stirring Methods 0.000 claims abstract description 16
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 14
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims abstract description 13
- 239000000203 mixture Substances 0.000 claims abstract description 13
- 229910052788 barium Inorganic materials 0.000 claims abstract description 11
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000004209 oxidized polyethylene wax Substances 0.000 claims abstract description 11
- 235000013873 oxidized polyethylene wax Nutrition 0.000 claims abstract description 11
- 239000003292 glue Substances 0.000 claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 8
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 8
- 239000003054 catalyst Substances 0.000 claims abstract description 8
- 239000000741 silica gel Substances 0.000 claims abstract description 8
- 229910002027 silica gel Inorganic materials 0.000 claims abstract description 8
- 239000003112 inhibitor Substances 0.000 claims abstract description 4
- 239000012265 solid product Substances 0.000 claims description 9
- IWOUKMZUPDVPGQ-UHFFFAOYSA-N barium nitrate Chemical compound [Ba+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O IWOUKMZUPDVPGQ-UHFFFAOYSA-N 0.000 claims description 8
- 239000002243 precursor Substances 0.000 claims description 8
- 239000002002 slurry Substances 0.000 claims description 8
- 108010010803 Gelatin Proteins 0.000 claims description 7
- SXRSQZLOMIGNAQ-UHFFFAOYSA-N Glutaraldehyde Chemical compound O=CCCCC=O SXRSQZLOMIGNAQ-UHFFFAOYSA-N 0.000 claims description 7
- 229920000159 gelatin Polymers 0.000 claims description 7
- 239000008273 gelatin Substances 0.000 claims description 7
- 235000019322 gelatine Nutrition 0.000 claims description 7
- 235000011852 gelatine desserts Nutrition 0.000 claims description 7
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 claims description 7
- 229920002554 vinyl polymer Polymers 0.000 claims description 7
- 239000000230 xanthan gum Substances 0.000 claims description 7
- 229920001285 xanthan gum Polymers 0.000 claims description 7
- 235000010493 xanthan gum Nutrition 0.000 claims description 7
- 229940082509 xanthan gum Drugs 0.000 claims description 7
- WDIHJSXYQDMJHN-UHFFFAOYSA-L barium chloride Chemical compound [Cl-].[Cl-].[Ba+2] WDIHJSXYQDMJHN-UHFFFAOYSA-L 0.000 claims description 6
- 229910001626 barium chloride Inorganic materials 0.000 claims description 6
- 238000004140 cleaning Methods 0.000 claims description 6
- 125000000118 dimethyl group Chemical group [H]C([H])([H])* 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 6
- 238000001914 filtration Methods 0.000 claims description 6
- 239000007787 solid Substances 0.000 claims description 6
- MNQZXJOMYWMBOU-VKHMYHEASA-N D-glyceraldehyde Chemical group OC[C@@H](O)C=O MNQZXJOMYWMBOU-VKHMYHEASA-N 0.000 claims description 5
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims description 5
- 229910052938 sodium sulfate Inorganic materials 0.000 claims description 5
- 235000011152 sodium sulphate Nutrition 0.000 claims description 5
- 241000220479 Acacia Species 0.000 claims description 4
- 239000011230 binding agent Substances 0.000 claims description 4
- 238000005507 spraying Methods 0.000 claims description 4
- 229920000084 Gum arabic Polymers 0.000 claims description 3
- 239000000205 acacia gum Substances 0.000 claims description 3
- 235000010489 acacia gum Nutrition 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 description 37
- 230000000052 comparative effect Effects 0.000 description 18
- 239000000047 product Substances 0.000 description 14
- 230000000694 effects Effects 0.000 description 8
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 8
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 6
- 238000004132 cross linking Methods 0.000 description 5
- QYLFHLNFIHBCPR-UHFFFAOYSA-N 1-ethynylcyclohexan-1-ol Chemical group C#CC1(O)CCCCC1 QYLFHLNFIHBCPR-UHFFFAOYSA-N 0.000 description 4
- 229910052697 platinum Inorganic materials 0.000 description 4
- 239000004372 Polyvinyl alcohol Substances 0.000 description 3
- 230000002411 adverse Effects 0.000 description 3
- 229910001422 barium ion Inorganic materials 0.000 description 3
- 230000001808 coupling effect Effects 0.000 description 3
- 239000000416 hydrocolloid Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000035699 permeability Effects 0.000 description 3
- 229920002451 polyvinyl alcohol Polymers 0.000 description 3
- 235000010643 Leucaena leucocephala Nutrition 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 230000003179 granulation Effects 0.000 description 2
- 238000005469 granulation Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 150000002500 ions Chemical class 0.000 description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- OFQCQIGMURIECL-UHFFFAOYSA-N 2-[2-(diethylamino)ethyl]-2',6'-dimethylspiro[isoquinoline-4,4'-oxane]-1,3-dione;phosphoric acid Chemical compound OP(O)(O)=O.O=C1N(CCN(CC)CC)C(=O)C2=CC=CC=C2C21CC(C)OC(C)C2 OFQCQIGMURIECL-UHFFFAOYSA-N 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 229940008099 dimethicone Drugs 0.000 description 1
- 239000004205 dimethyl polysiloxane Substances 0.000 description 1
- 235000013870 dimethyl polysiloxane Nutrition 0.000 description 1
- 230000005670 electromagnetic radiation Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 229920000435 poly(dimethylsiloxane) Polymers 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 229910001415 sodium ion Inorganic materials 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
Classifications
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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
-
- 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
-
- 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
-
- 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
- C08J2401/00—Characterised by the use of cellulose, modified cellulose or cellulose derivatives
- C08J2401/08—Cellulose derivatives
- C08J2401/10—Esters of organic acids
- C08J2401/12—Cellulose acetate
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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
- C08J2405/00—Characterised by the use of polysaccharides or of their derivatives not provided for in groups C08J2401/00 or C08J2403/00
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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
- C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2423/26—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers modified by chemical after-treatment
- C08J2423/30—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers modified by chemical after-treatment by oxidation
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- C08J2489/00—Characterised by the use of proteins; Derivatives thereof
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Abstract
The application relates to the field of heat conduction wave-absorbing materials, and specifically discloses a heat conduction wave-absorbing material which comprises the following raw materials in percentage by weight: 1-5% of silica gel, 10-20% of composite silicone oil, 30-50% of wave-absorbing material, 0.02-0.08% of inhibitor, 0.07-0.13% of catalyst, 20-33% of composite filler, 0.03-0.07% of oxidized polyethylene wax and the balance of alumina; the wave absorbing material comprises barium source solution, sulfate solution, silicon carbide and mica powder; the composite filler is prepared through the following steps: adding the hydrophilic colloid into water to form a glue solution, uniformly dispersing cellulose acetate and iron powder in the water to form a mixture, stirring the glue solution, simultaneously adding a cross-linking agent and the mixture, wherein the adding amount of the cross-linking agent is 1-2.5% of the mass of the hydrophilic colloid, and uniformly stirring to obtain the composite filler. The gasket material has excellent heat conducting performance and wave absorbing performance, strong tensile strength and good mechanical property.
Description
Technical Field
The application relates to the field of heat-conducting wave-absorbing materials, in particular to a heat-conducting wave-absorbing gasket material.
Background
The heat-conducting wave-absorbing material is a composite material with the characteristics of a thermal interface material and excellent electromagnetic wave absorption capacity, can be directly applied between a heat source and a radiator, can absorb electromagnetic radiation while leading out heat, and achieves the aim of eliminating electromagnetic interference.
At present, the heat conducting and wave absorbing material is mostly used in the form of a gasket, and is generally composed of a heat conducting agent, a wave absorbing agent, silica gel and other components, so that the heat conducting and wave absorbing performance of the gasket is improved, the heat conducting material and the wave absorbing material are required to be matched and filled, namely a certain amount of heat conducting filler is required to be filled to meet the heat conducting requirement, a large amount of wave absorbing filler is required to be filled to meet the wave absorbing performance requirement, but the heat conducting material, the wave absorbing filler, an organosilicon system and a non-organosilicon system have the problem of compatibility difference, so that the wave absorbing filler cannot be added in a large amount or cannot be well combined after being added, the heat conducting performance and the wave absorbing performance cannot reach the ideal effect, and the mechanical property of the obtained gasket material is poor.
Disclosure of Invention
The heat-conducting wave-absorbing gasket material has excellent heat-conducting performance and wave-absorbing performance, and is high in tensile strength and good in mechanical property.
The application provides a heat conduction wave-absorbing gasket adopts following technical scheme:
a heat-conducting wave-absorbing gasket material comprises the following raw materials in percentage by weight: 1-5% of silica gel, 10-20% of composite silicone oil, 30-50% of wave-absorbing material, 0.02-0.08% of inhibitor, 0.07-0.13% of catalyst, 20-33% of composite filler, 0.03-0.07% of oxidized polyethylene wax and the balance of alumina; the wave absorbing material comprises barium source solution, sulfate solution, silicon carbide and mica powder;
the composite filler is prepared through the following steps: adding the hydrophilic colloid into water to form a glue solution, uniformly dispersing cellulose acetate and iron powder in the water to form a mixture, stirring the glue solution, simultaneously adding a cross-linking agent and the mixture, wherein the adding amount of the cross-linking agent is 1-2.5% of the mass of the hydrophilic colloid, and uniformly stirring to obtain the composite filler.
By adopting the technical scheme, hydrophilic colloid is adopted to carry out solidification and crosslinking under the action of a crosslinking agent, and added cellulose acetate and iron powder are wrapped and clamped in the process of forming a crosslinking object, so that when the composite filler is filled in a system, the composite filler has excellent heat conducting property, can effectively improve the cohesiveness with other raw materials, can promote the formation of tight connection between the raw material components, and improves the mechanical property of a gasket material; the iron powder has excellent heat conductivity, and can further promote the heat conduction performance of the product by being matched with aluminum oxide; however, the iron powder has certain conductivity, and the addition of the cellulose acetate can play a role in insulation to a certain extent, so that adverse effects caused by the conductivity of the iron powder are effectively reduced.
The barium source solution and the sulfate solution in the wave-absorbing material can form barium sulfate precipitate, and after being matched with silicon carbide and mica powder under certain conditions, the formed wave-absorbing material not only has good wave-absorbing performance, but also can effectively improve the mechanical property of the gasket material.
The oxidized polyethylene wax has excellent lubricity and dispersibility, has good coupling property, and effectively improves the compatibility among the raw material components, so that the composite filler and the wave-absorbing material can be uniformly and tightly combined in a system, the internal structure of the gasket material is effectively improved, and the mechanical property of the product is improved. Compared with single silicone oil, the composite silicone oil can better promote the compatibility and dispersibility of raw material components, the catalyst is usually a platinum catalyst, and the inhibitor is ethynyl cyclohexanol, so that the comprehensive quality of the gasket material is ensured.
Preferably, the hydrophilic colloid is selected from at least two of gelatin, acacia, and xanthan gum.
By adopting the technical scheme, the selection of the components of the hydrophilic colloid is optimized, so that the hydrophilic colloid is better solidified and crosslinked with the crosslinking agent, the capability of wrapping cellulose acetate and iron powder is improved, meanwhile, the binding force of the composite filler and other raw material components is improved, and the heat conduction performance and mechanical property of the product are obviously improved. The hydrophilic colloid is generally compounded by gelatin and xanthan gum, the gelatin and the xanthan gum are wide in sources, good in thickening property and biocompatibility, and the formed composite filler is good in dispersibility and stability in a system, can effectively promote the combination of components, and achieves the effect of improving the mechanical properties of products.
Preferably, the cross-linking agent is glyceraldehyde or glutaraldehyde.
By adopting the technical scheme, the component selection of the cross-linking agent is optimized, the cross-linking effect on the hydrophilic colloid is improved, and the cross-linking agent is better in glyceraldehyde because glutaraldehyde has pungent smell.
Preferably, the mass ratio of the hydrophilic colloid to the cellulose acetate to the iron powder is (1-2.5): 1-2): 1.7-2.6.
By adopting the technical scheme, the consumption relation of the raw material components in the composite filler is optimized, and the heat conduction performance and mechanical property of the product are further improved.
Preferably, the wave-absorbing material is prepared by the following steps:
step 1, uniformly dispersing silicon carbide and mica powder in a barium source solution to prepare slurry with the solid content of 40-50%, adding a sulfate solution into the slurry while stirring to obtain a solid product, filtering, cleaning and drying the solid product to obtain a suction front precursor;
and 2, preparing the wave-absorbing material by spraying and granulating the wave-absorbing precursor and the binder.
By adopting the technical scheme, the silicon carbide and the mica powder are uniformly dispersed in the barium source solution, sulfate ions in the added sulfate solution are combined with the barium ions, the silicon carbide and the mica powder are coated and are precipitated together, uniformity of each component can be maintained during stirring, corresponding impurity ions can be effectively removed through filtering, cleaning and drying, and the wave-absorbing material with good bonding effect is formed through spray granulation with the binder, so that the wave-absorbing performance of the gasket material can be effectively improved, and the bonding property and compatibility among all raw material components can be improved, so that all raw material components are tightly combined, and the mechanical property of a product is effectively improved. The adhesive is preferably polyvinyl alcohol solution, has excellent adhesion and component compatibility, can effectively improve the binding force between the wave-absorbing material and each component, and further improves the mechanical property of the gasket material.
Preferably, the mass ratio of the silicon carbide to the mica powder is (2-3.5): 1-2.
By adopting the technical scheme, the dosage relation between the silicon carbide and the mica powder is optimized, and the wave absorbing performance of the wave absorbing material is further improved.
Preferably, the barium source solution is a barium chloride solution or a barium nitrate solution, and the sulfate solution is a sodium sulfate solution.
By adopting the technical scheme, the barium chloride solution and the barium nitrate solution can both provide barium ions for the system, the sodium sulfate solution can provide corresponding sulfate ions for the system, and the barium source solution is preferably the barium chloride solution, so that the barium chloride solution and the sodium ions are easier to remove from the system after forming the sodium chloride solution, and the quality of the wave-absorbing material is improved.
Preferably, the composite silicone oil is a mixture of vinyl silicone oil and dimethyl silicone oil.
Preferably, the weight ratio of the vinyl silicone oil to the dimethyl silicone oil is 1 (0.8-1.5).
By adopting the technical scheme, the component matching of the composite silicone oil is optimized, the vinyl silicone oil and the dimethyl silicone oil are compounded, the viscosity of the system can be effectively improved, the dosage ratio of the vinyl silicone oil and the dimethyl silicone oil can be adjusted, the dispersion uniformity of all raw material components can be promoted, and the mechanical property of the product can be improved.
In summary, the present application has the following beneficial effects:
1. the hydrophilic colloid is adopted to carry out solidification and crosslinking under the action of the crosslinking agent, and the added cellulose acetate and iron powder are wrapped and clamped in the process of forming a crosslinking object, so that when the composite filler is filled in a system, the composite filler has excellent heat conducting property, can effectively improve the cohesiveness with other raw materials, can promote the formation of tight connection between the raw material components, and improves the mechanical property of a gasket material; the iron powder has excellent heat conductivity, and can further promote the heat conduction performance of the product by being matched with aluminum oxide; however, the iron powder has certain conductivity, and the addition of the cellulose acetate can play a role in insulation to a certain extent, so that adverse effects caused by the conductivity of the iron powder are effectively reduced.
2. Firstly, uniformly dispersing silicon carbide and mica powder in a barium source solution, combining sulfate ions in the added sulfate solution with barium ions, coating the silicon carbide and the mica powder, precipitating the silicon carbide and the mica powder together, maintaining the uniformity of each component during stirring, filtering, cleaning and drying the mixture, effectively removing corresponding impurity ions, and carrying out spray granulation with a binder to form a wave-absorbing material with good bonding effect, so that the wave-absorbing performance of the gasket material can be effectively improved, the bonding property and compatibility between each raw material component can be improved, the raw material components can be tightly combined, and the mechanical property of the product can be effectively improved.
3. The oxidized polyethylene wax has excellent lubricity and dispersibility, has good coupling property, and effectively improves the compatibility among the raw material components, so that the composite filler and the wave-absorbing material can be uniformly and tightly combined in a system, the internal structure of the gasket material is effectively improved, and the mechanical property of the product is improved.
Detailed Description
The present application is described in further detail below with reference to examples.
The raw materials used in the method are all common commercial raw materials, and part of raw materials are shown in table 1.
TABLE 1
| Name of the name | CAS number |
| Silica gel | 63148-60-7 |
| Vinyl silicone oil | 28323-47-9 |
| Dimethicone | 9006-65-9 |
| Alumina oxide | 1344-28-1 |
| Iron powder | 7439-89-6 |
Preparation of composite Filler
Preparation example 1
The composite filler is prepared through the following steps: adding gelatin and acacia in a mass ratio of 1:0.6 into water to form a glue solution, uniformly dispersing cellulose acetate and iron powder in the water to form a mixture with a solid content of 60%, stirring the glue solution, simultaneously adding glutaraldehyde and the mixture, wherein the addition amount of glutaraldehyde is 1% of the total mass of the hydrophilic colloid, and uniformly stirring to obtain a composite filler; the mass ratio of the hydrophilic colloid to the cellulose acetate to the iron powder is 1:1:1.7.
Preparation example 2
The composite filler is prepared through the following steps: adding xanthan gum and acacia in a mass ratio of 1:1 into water to form a glue solution, uniformly dispersing cellulose acetate and iron powder in the water to form a mixture with a solid content of 70%, stirring the glue solution, simultaneously adding glutaraldehyde and the mixture, wherein the addition amount of glutaraldehyde is 2.5% of the total mass of the hydrophilic colloid, and uniformly stirring to obtain a composite filler; the mass ratio of the hydrophilic colloid to the cellulose acetate to the iron powder is 2.5:2:2.6.
Preparation example 3
The difference from preparation example 1 is that the hydrocolloid is gelatin and xanthan gum in a mass ratio of 1:2, and the rest is the same as preparation example 1.
Preparation example 4
The difference from preparation example 3 is that the hydrophilic colloid is gelatin and xanthan gum and acacia gum in a mass ratio of 1:1:1, and the rest is the same as preparation example 3.
Preparation example 5
The difference from preparation example 3 is that the crosslinking agent is glyceraldehyde, the addition amount of glyceraldehyde is 1.6% of the hydrophilic colloid, and the rest is the same as preparation example 3.
Preparation example 6
The difference from preparation example 5 is that the mass ratio of the hydrocolloid, the cellulose acetate and the iron powder is 2:1.7:2.3, and the rest is the same as preparation example 5.
Preparation example of wave-absorbing Material
Preparation example one
The wave-absorbing material is prepared through the following steps:
uniformly dispersing silicon carbide and mica powder in a mass ratio of 2:1 in a barium nitrate solution to prepare slurry with a solid content of 40%, adding a sodium sulfate solution into the slurry while stirring to obtain a solid product, filtering, cleaning and drying the solid product at a temperature of 40 ℃ to prepare a suction front precursor;
and 2, granulating the wave-absorbing precursor and polyvinyl alcohol by spraying to obtain the wave-absorbing material.
Preparation example two
Uniformly dispersing silicon carbide and mica powder with the mass ratio of 3.5:2 in a barium chloride solution to prepare slurry with the solid content of 50%, adding a sodium sulfate solution into the slurry while stirring to obtain a solid product, filtering and cleaning the solid product, and drying the solid product at the temperature of 40 ℃ to prepare a wave-absorbing precursor;
and 2, granulating the wave-absorbing precursor and polyvinyl alcohol by spraying to obtain the wave-absorbing material.
Preparation example three
The difference from the second preparation is that the mass ratio of silicon carbide to mica powder is 3:1.7, and the rest is the same as the third preparation.
Preparation example IV
The difference from the third preparation is that the mass ratio of silicon carbide to mica powder is 1:3.7, and the rest is the same as the third preparation.
Examples
Example 1
The heat-conducting wave-absorbing gasket material comprises the following raw materials in percentage by weight: 1% of silica gel, 20% of composite silicone oil, 30% of wave-absorbing material prepared in preparation example I, 0.02% of ethynyl cyclohexanol, 0.07% of platinum catalyst, 33% of composite filler prepared in preparation example 1, 0.03% of oxidized polyethylene wax and the balance of alumina.
Example 2
The heat-conducting wave-absorbing gasket material comprises the following raw materials in percentage by weight: silica gel 5%, composite silicone oil 10%, wave-absorbing material 50% prepared in preparation example I, ethynyl cyclohexanol 0.08%, platinum catalyst 0.13%, composite filler 20% prepared in preparation example 1, oxidized polyethylene wax 0.07% and alumina balance.
Example 3
The heat-conducting wave-absorbing gasket material comprises the following raw materials in percentage by weight: 3% of silica gel, 18% of composite silicone oil, 40% of wave-absorbing material prepared in preparation example I, 0.05% of ethynyl cyclohexanol, 0.1% of platinum catalyst, 30% of composite filler prepared in preparation example 1, 0.05% of oxidized polyethylene wax and the balance of alumina.
Example 4
The difference from example 3 is that the composite filler prepared in preparation example 2 was selected, and the rest was the same as in example 3.
Example 5
The difference from example 3 is that the composite filler prepared in preparation example 3 was selected, and the rest was the same as in example 3.
Example 6
The difference from example 3 is that the composite filler prepared in preparation example 4 was selected, and the rest was the same as in example 3.
Example 7
The difference from example 3 is that the composite filler prepared in preparation example 5 was selected, and the rest was the same as in example 3.
Example 8
The difference from example 3 is that the composite filler prepared in preparation example 6 was selected, and the rest was the same as in example 3.
Example 9
The difference from example 7 is that the wave-absorbing material prepared in preparation II was used, and the rest was the same as in example 7.
Example 10
The difference from example 7 is that the wave-absorbing material prepared in preparation III was used, and the rest was the same as in example 7.
Example 11
The difference from example 7 is that the wave-absorbing material prepared in preparation example four was used, and the rest was the same as in example 7.
Comparative example
Comparative example 1
The difference from example 10 is that no oxidized polyethylene wax was added, and the rest was the same as in example 10.
Comparative example 2
The difference from example 10 is that the composite filler is prepared via the following steps: the hydrocolloid, cellulose acetate and iron powder were mixed uniformly, and the rest was the same as in example 10.
Comparative example 3
The difference from example 10 is that the same amount of iron powder was used instead of the composite filler, and the rest was the same as in example 10.
Comparative example 4
The difference from example 10 is that silicon carbide is used in the same amount as the wave-absorbing material, and the rest is the same as example 10.
Comparative example 5
The difference from example 10 is that barium sulfate is used in the same amount as in example 10 instead of the wave-absorbing material.
Performance test
The gasket materials prepared in examples 1-11 and comparative examples 1-5 were tested for tensile strength according to ASTM D412, thermal conductivity according to ASTM D5470, and permeability according to JB/T13536-2018, and the results are recorded in Table 2.
TABLE 2
| Tensile Strength/MPa | Coefficient of thermal conductivity (W/m.K) | Permeability (@ 1 GHz) | |
| Example 1 | 0.82 | 3 | 12 |
| Example 2 | 0.8 | 3.2 | 12 |
| Example 3 | 0.88 | 3.9 | 14 |
| Example 4 | 0.84 | 3.4 | 13 |
| Example 5 | 0.96 | 4.1 | 14 |
| Example 6 | 0.92 | 3.8 | 13 |
| Example 7 | 1.1 | 4.6 | 15 |
| Example 8 | 1.3 | 4.9 | 15 |
| Example 9 | 1 | 4.8 | 16 |
| Example 10 | 1.4 | 5.1 | 17 |
| Example 11 | 1.1 | 4.7 | 14 |
| Comparative example 1 | 0.7 | 3.1 | 10 |
| Comparative example 2 | 0.9 | 2.1 | 11 |
| Comparative example 3 | 0.6 | 2.7 | 10 |
| Comparative example 4 | 0.8 | 3.4 | 10 |
| Comparative example 5 | 0.7 | 3 | 7 |
As can be seen by combining examples 1-11 and combining Table 2, the gasket material has the heat conductivity coefficient of more than 3W/m.K, excellent heat conductivity, magnetic permeability of more than or equal to 12, excellent wave absorption performance, high tensile strength and excellent mechanical property.
As can be seen by combining example 10 and comparative example 1 and combining Table 2, the combination property of the gasket material is reduced due to the lack of oxidized polyethylene wax in comparative example 1, and the oxidized polyethylene wax has excellent lubricity and dispersibility, has good coupling property, and effectively improves the compatibility of the raw material components, so that the composite filler and the wave-absorbing material can be uniformly dispersed and tightly combined in the system, the internal structure of the gasket material is effectively improved, and the heat conduction and wave-absorbing properties of the gasket material are improved, and meanwhile, the mechanical property of the product is improved.
As can be seen from the combination of examples 10 and comparative examples 2 to 3 and table 2, the heat conductive properties of the resulting gasket material were significantly reduced regardless of whether the components in the composite filler were directly mixed or replaced with iron powder, and even though the iron powder used in comparative example 3 had excellent heat conductivity, the iron powder was likely to settle in the system and had a phenomenon of uneven dispersion, so that the overall properties of the resulting product were worse than in example 10, the iron powder was conductive while conducting heat, and had an adverse effect on the gasket material.
It can be seen from the combination of example 10 and comparative examples 4 to 5 and the combination of table 2 that, regardless of whether silicon carbide or barium sulfate is used as the wave-absorbing material, the tensile strength, the heat conduction property and the wave-absorbing property of the gasket materials prepared in comparative examples 4 and 5 are significantly reduced, so that the wave-absorbing material prepared in the application can not only significantly improve the wave-absorbing property of the product, but also assist in improving the internal structure of the material and improve the mechanical property and the heat conduction property of the product.
The present embodiment is merely illustrative of the present application and is not intended to be limiting, and those skilled in the art, after having read the present specification, may make modifications to the present embodiment without creative contribution as required, but is protected by patent laws within the scope of the claims of the present application.
Claims (9)
1. The heat-conducting wave-absorbing gasket material is characterized by comprising the following raw materials in percentage by weight: 1-5% of silica gel, 10-20% of composite silicone oil, 30-50% of wave-absorbing material, 0.02-0.08% of inhibitor, 0.07-0.13% of catalyst, 20-33% of composite filler, 0.03-0.07% of oxidized polyethylene wax and the balance of alumina; the wave absorbing material comprises barium source solution, sulfate solution, silicon carbide and mica powder;
the composite filler is prepared through the following steps: adding the hydrophilic colloid into water to form a glue solution, uniformly dispersing cellulose acetate and iron powder in the water to form a mixture, stirring the glue solution, simultaneously adding a cross-linking agent and the mixture, wherein the adding amount of the cross-linking agent is 1-2.5% of the mass of the hydrophilic colloid, and uniformly stirring to obtain the composite filler.
2. The thermally conductive wave-absorbing gasket material of claim 1 wherein: the hydrophilic colloid is selected from at least two of gelatin, acacia and xanthan gum.
3. The thermally conductive wave-absorbing gasket material of claim 2 wherein: the cross-linking agent is glyceraldehyde or glutaraldehyde.
4. A thermally conductive wave-absorbing gasket material according to any one of claims 1-3, wherein: the mass ratio of the hydrophilic colloid to the cellulose acetate to the iron powder is (1-2.5): 1-2): 1.7-2.6.
5. The thermally conductive wave-absorbing gasket material of claim 1 wherein: the wave-absorbing material is prepared through the following steps:
step 1, uniformly dispersing silicon carbide and mica powder in a barium source solution to prepare slurry with the solid content of 40-50%, adding a sulfate solution into the slurry while stirring to obtain a solid product, filtering, cleaning and drying the solid product to obtain a suction front precursor;
and 2, preparing the wave-absorbing material by spraying and granulating the wave-absorbing precursor and the binder.
6. The thermally conductive wave-absorbing gasket material of claim 1 or 5, wherein: the mass ratio of the silicon carbide to the mica powder is (2-3.5) to (1-2).
7. The thermally conductive wave-absorbing gasket material of claim 6 wherein: the barium source solution is barium chloride solution or barium nitrate solution, and the sulfate solution is sodium sulfate solution.
8. The thermally conductive wave-absorbing gasket material of claim 1 wherein: the composite silicone oil is a mixture of vinyl silicone oil and dimethyl silicone oil.
9. The thermally conductive wave-absorbing gasket material of claim 8 wherein: the weight ratio of the vinyl silicone oil to the dimethyl silicone oil is 1 (0.8-1.5).
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