CN112852168A - Preparation method of heat-conducting silicone rubber composite material suitable for rail transit - Google Patents
Preparation method of heat-conducting silicone rubber composite material suitable for rail transit Download PDFInfo
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- 229920002379 silicone rubber Polymers 0.000 title claims abstract description 126
- 239000004945 silicone rubber Substances 0.000 title claims abstract description 87
- 239000002131 composite material Substances 0.000 title claims abstract description 56
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- 239000006087 Silane Coupling Agent Substances 0.000 claims abstract description 33
- 239000000945 filler Substances 0.000 claims abstract description 29
- 239000000243 solution Substances 0.000 claims abstract description 25
- 238000000034 method Methods 0.000 claims abstract description 22
- 239000002002 slurry Substances 0.000 claims abstract description 22
- 238000003756 stirring Methods 0.000 claims abstract description 21
- 239000006185 dispersion Substances 0.000 claims abstract description 20
- 238000001035 drying Methods 0.000 claims abstract description 18
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 17
- 239000011259 mixed solution Substances 0.000 claims abstract description 14
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 12
- 239000007788 liquid Substances 0.000 claims abstract description 11
- 239000003960 organic solvent Substances 0.000 claims abstract description 11
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 claims abstract description 11
- 238000009966 trimming Methods 0.000 claims abstract description 11
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 claims abstract description 11
- 238000000227 grinding Methods 0.000 claims abstract description 10
- 229920002554 vinyl polymer Polymers 0.000 claims abstract description 9
- 238000004073 vulcanization Methods 0.000 claims abstract description 9
- 150000007524 organic acids Chemical class 0.000 claims abstract description 7
- 238000000465 moulding Methods 0.000 claims abstract description 5
- 238000003825 pressing Methods 0.000 claims abstract description 3
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 15
- XDLMVUHYZWKMMD-UHFFFAOYSA-N 3-trimethoxysilylpropyl 2-methylprop-2-enoate Chemical compound CO[Si](OC)(OC)CCCOC(=O)C(C)=C XDLMVUHYZWKMMD-UHFFFAOYSA-N 0.000 claims description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 10
- 229910052799 carbon Inorganic materials 0.000 claims description 10
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims description 9
- HIHIPCDUFKZOSL-UHFFFAOYSA-N ethenyl(methyl)silicon Chemical group C[Si]C=C HIHIPCDUFKZOSL-UHFFFAOYSA-N 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 6
- KUCOHFSKRZZVRO-UHFFFAOYSA-N terephthalaldehyde Chemical compound O=CC1=CC=C(C=O)C=C1 KUCOHFSKRZZVRO-UHFFFAOYSA-N 0.000 claims description 6
- 239000007822 coupling agent Substances 0.000 claims description 5
- 239000002082 metal nanoparticle Substances 0.000 claims description 3
- 239000011265 semifinished product Substances 0.000 claims description 2
- 230000008569 process Effects 0.000 abstract description 8
- 239000007769 metal material Substances 0.000 abstract description 6
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 description 12
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 6
- 238000001132 ultrasonic dispersion Methods 0.000 description 6
- 238000013016 damping Methods 0.000 description 5
- 239000002105 nanoparticle Substances 0.000 description 5
- 239000000047 product Substances 0.000 description 5
- 230000009467 reduction Effects 0.000 description 5
- 238000001291 vacuum drying Methods 0.000 description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- XDTMQSROBMDMFD-UHFFFAOYSA-N Cyclohexane Chemical compound C1CCCCC1 XDTMQSROBMDMFD-UHFFFAOYSA-N 0.000 description 3
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 230000008439 repair process Effects 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 125000003277 amino group Chemical group 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000006173 Good's buffer Substances 0.000 description 1
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 150000001299 aldehydes Chemical class 0.000 description 1
- 238000000498 ball milling Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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- C08K13/00—Use of mixtures of ingredients not covered by one single of the preceding main groups, each of these compounds being essential
- C08K13/06—Pretreated ingredients and ingredients covered by the main groups C08K3/00 - C08K7/00
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/07—Aldehydes; Ketones
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/54—Silicon-containing compounds
- C08K5/541—Silicon-containing compounds containing oxygen
- C08K5/5425—Silicon-containing compounds containing oxygen containing at least one C=C bond
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- 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
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Abstract
The invention discloses a preparation method of a heat-conducting silicone rubber composite material suitable for rail transit, which comprises the steps of preparing an organic solvent; adding a heat-conducting filler into an organic solvent to obtain a mixed solution; respectively and sequentially adding organic acid, a silane coupling agent with amino and a silane coupling agent with vinyl into the mixed solution, and uniformly stirring to obtain a dispersion liquid; adding silicon rubber into the dispersion liquid for dissolving to obtain a silicon rubber solution; adding a vulcanizing agent and a cross-linking agent into a silicone rubber solution for uniform dispersion, and grinding until a heat-conducting filler is uniformly dispersed in the silicone rubber solution to obtain silicone rubber slurry; and (3) introducing the silicon rubber slurry into a mold, fully drying, carrying out mold pressing vulcanization molding, and trimming to obtain the heat-conducting silicon rubber composite material. The heat-conducting silicone rubber composite material prepared by the invention has the characteristics of high heat conductivity coefficient and low thermal expansion coefficient, is in the same level with a metal material, and can be well matched in the heat conduction process.
Description
Technical Field
The invention relates to the technical field of rail transit, in particular to a preparation method of a heat-conducting silicone rubber composite material suitable for rail transit.
Background
With the rapid development of economy, rail transit such as national high-speed rails and subways is rapidly developed, and a train has large kinetic energy and needs a good buffer damping device in the high-speed running process; on the other hand, the heat generated in the high-speed running process of the train is large, so that the aging of vibration reduction components and the decline of vibration reduction performance are caused, and therefore, the development of the heat-conducting rubber product with good heat conduction and vibration reduction performance has important significance for the normal running of rail transit.
The running speed of rail vehicles such as high-speed rails is very high, and the impact force on each part is large without damping, so that each part is damaged; moreover, the heat generation is large, and the heat dissipation influences the normal operation of each part in time. Therefore, the application of the high thermal conductivity and thermal conductivity silicone rubber composite material suitable for rail transit is more and more important.
Disclosure of Invention
Therefore, it is necessary to provide a method for preparing a heat-conducting silicone rubber composite material suitable for rail transit, so that the heat-conducting silicone rubber composite material has the characteristics of high heat conductivity coefficient and low thermal expansion coefficient, is in the same level as a metal material, and can be well matched with the metal material in a heat conduction process.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a preparation method of a heat-conducting silicone rubber composite material suitable for rail transit comprises the following steps,
preparing an organic solvent; when the organic solvent contains more than two single solvents, the more than two single solvents can be mixed and stirred for increasing the preparation speed of the organic solvent;
adding a heat-conducting filler into an organic solvent to obtain a mixed solution; after the heat-conducting filler is added into the organic solvent, the heat-conducting filler is dispersed in the organic solvent in an ultrasonic dispersion or stirring dispersion mode;
respectively and sequentially adding organic acid, a silane coupling agent with amino and a silane coupling agent with vinyl into the mixed solution, and uniformly stirring to obtain a dispersion liquid;
adding silicon rubber into the dispersion liquid for dissolving to obtain a silicon rubber solution;
adding a vulcanizing agent and a cross-linking agent into a silicone rubber solution for uniform dispersion, and grinding until a heat-conducting filler is uniformly dispersed in the silicone rubber solution to obtain silicone rubber slurry;
introducing the silicon rubber slurry into a mold, fully drying, molding, vulcanizing, forming and trimming to obtain the heat-conducting silicon rubber composite material; the obtained heat-conducting silicone rubber composite material has the characteristics of high heat conductivity coefficient and low thermal expansion coefficient, is in the same level with a metal material, can be better matched in the heat conduction process, prevents deformation and new gaps caused by thermal expansion, can flexibly adjust the repair function and the heat conductivity, and can be used for a long time at the temperature of 200 ℃.
Preferably, the silane coupling agent with amino and the silane coupling agent with vinyl are matched according to the weight ratio of 1:1, wherein the silane coupling agent with amino and the silane coupling agent with vinyl are two silane coupling agents with completely different reaction mechanisms, and after the silane coupling agent with amino and the silane coupling agent with vinyl are compounded for use, the prepared heat-conducting silicone rubber composite material can form a smooth heat-conducting channel and good interface combination, achieves the effects of high heat conduction and strong vibration reduction, has excellent chemical stability and electrical performance, is resistant to water, ozone and weather, and the functions and vulcanization time of the heat-conducting silicone rubber composite material can be flexibly adjusted through the type and the using amount of the coupling agent and the vulcanization temperature, the method is suitable for rail transit.
Preferably, the silicone rubber is methyl vinyl silicone rubber with Shore A hardness of 20-100 degrees, and the mass fraction of the silicone rubber in the silicone rubber solution is 20-80%; the silicon rubber has excellent chemical stability, higher thermal decomposition temperature and room-temperature vulcanization, and can reduce the oxidation of carbon-coated metal nanoparticles and the reduction of heat conductivity caused by the vulcanization process; the vibration-damping material is simple to operate in the preparation process, can be directly used as a vibration-damping material, and can automatically repair damaged rail transit in the using process.
Preferably, the heat-conducting filler is carbon-coated metal nanoparticles, specifically one or more than two of carbon-coated copper, carbon-coated aluminum or carbon-coated iron nanoparticles, the particle size of the heat-conducting filler is 10nm to 200nm, and the total weight of the heat-conducting filler is 5% to 50% of the weight of the silicone rubber.
In the above preparation method of the heat-conducting silicone rubber composite material suitable for rail transit, preferably, the organic acid is one or both of acetic acid and citric acid, and the weight of the organic acid is 0.001% -1% of the total weight of the heat-conducting filler.
Preferably, the silane coupling agent with amino groups can be one or more than two of a silane coupling agent KH-550, Dow Corning Z-6011, A-1110 or KBM-602, and the weight of the silane coupling agent with amino groups is 0.1-5% of the total weight of the heat-conducting filler.
Preferably, the coupling agent with vinyl groups can be one or more than two of silane coupling agents KH-570, Dow Corning Z-6030, A-174 or KBM-503, and the weight of the coupling agent with vinyl groups is 0.1-5% of the total weight of the heat-conducting filler.
According to the preparation method of the heat-conducting silicone rubber composite material suitable for rail transit, preferably, the vulcanizing agent is a bis 2, 5 vulcanizing agent, the weight of the vulcanizing agent is 0.5-5.0% of the weight of the silicone rubber, and the vulcanization performance and the vibration damping performance of the silicone rubber in the preparation process of the heat-conducting silicone rubber composite material can be adjusted by selecting the vulcanizing agents with different weights.
Preferably, the crosslinking agent can be one or two of terephthalaldehyde or trimesic aldehyde, the weight of the crosslinking agent is 0.1% -5% of the total weight of the heat-conducting filler, and the weight of the crosslinking agent is the same as that of the silane coupling agent with amino.
Preferably, the vulcanizing agent and the cross-linking agent are added into the silicone rubber solution to be uniformly dispersed, and then the mixture is ground until the heat-conducting filler is uniformly dispersed in the silicone rubber solution to obtain the silicone rubber slurry, wherein the specific operations are as follows:
adding a vulcanizing agent and a cross-linking agent into a silicone rubber solution, carrying out ultrasonic dispersion for 10-120 min under the condition that the ultrasonic power is 500-1500 w, and grinding by using a high-shear dispersion machine or a ball mill until a heat-conducting filler is uniformly dispersed in the silicone rubber solution to obtain silicone rubber slurry; when a high-shear disperser is selected, the rotating speed of the high-shear disperser is 1000-15000 r/min, and the grinding time of the high-shear disperser is 2-24 h; when a ball mill is selected, the rotating speed of the ball mill is 20-200 r/min, and the grinding time of the ball mill is 2-24 h.
Or adding a vulcanizing agent and a crosslinking agent into the silicon rubber solution, uniformly dispersing in a stirring manner, and grinding by a high-shear dispersion machine or a ball mill until the heat-conducting filler is uniformly dispersed in the silicon rubber solution to obtain the silicon rubber slurry.
Preferably, the method for preparing the heat-conducting silicone rubber composite material suitable for rail transit comprises the following steps of introducing the silicone rubber slurry into a mold, fully drying, carrying out mold pressing vulcanization molding, and trimming to obtain the heat-conducting silicone rubber composite material:
uniformly introducing the silicon rubber slurry into a mold;
putting the mould into a drying device for drying treatment to obtain a semi-finished product of the heat-conducting silicone rubber composite material; the mold is placed into a drying device for drying treatment, so that organic solvents in the silicone rubber slurry can be effectively removed, the drying device is a vacuum drying oven, the drying temperature is 0-60 ℃, and the drying time is 8 hours;
vulcanizing and trimming the dried and unvulcanized semi-finished heat-conducting silicone rubber composite material to obtain a heat-conducting silicone rubber composite material; the method comprises the following steps of (1) vulcanizing a dry unvulcanized semi-finished heat-conducting silicone rubber composite material at room temperature for 120-180 min; the dry and unvulcanized semi-finished heat-conducting silicone rubber composite material can also be placed on a flat vulcanizing machine for vulcanization treatment, wherein the vulcanizing pressure of the flat vulcanizing machine is 5-20 MPa, the vulcanizing temperature of the flat vulcanizing machine is 0-60 ℃, and the vulcanizing time of the flat vulcanizing machine is 3-20 min.
Compared with the prior art, the preparation method of the heat-conducting silicone rubber composite material suitable for rail transit has the following advantages:
the heat conductivity coefficient is high, the thermal expansion coefficient is low, the heat conductivity coefficient and the metal material are in the same level, the heat conduction process can be well matched, deformation and new gaps caused by thermal expansion are prevented, the repair function and the heat conductivity can be flexibly adjusted, and the high-temperature resistance can be used for a long time at the temperature of 200 ℃.
Detailed Description
In order to facilitate an understanding of the present invention, the present invention will be described more fully and in detail with reference to the preferred embodiments, but the scope of the present invention is not limited to the specific embodiments below.
Unless otherwise defined, all terms of art used hereinafter have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the present invention.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.
Example 1
Adding 10g of carbon-coated copper nanoparticles with the average particle size of 100nm into 100g of tetrahydrofuran, and performing ultrasonic dispersion for 30min under the condition that the ultrasonic power is 1000W to obtain a mixed solution;
adding 0.02g of acetic acid into the mixed solution, stirring and dispersing, simultaneously adding 0.02g of silane coupling agent KH-570 and 0.02g of silane coupling agent KH-550 respectively under stirring, and keeping stirring for 20min to obtain tetrahydrofuran dispersion;
dissolving 40g of methyl vinyl silicone rubber in the tetrahydrofuran dispersion liquid to prepare a silicone rubber solution;
respectively adding 1.5g of bis 2, 5 silicon rubber vulcanizing agent and 0.02g of terephthalaldehyde into a silicon rubber solution, uniformly dispersing in a stirring mode, and grinding in a high-shear disperser for 24 hours to obtain silicon rubber slurry with uniformly dispersed heat-conducting filler;
uniformly introducing the silicon rubber slurry into a mold, and drying in a vacuum drying oven at normal temperature for 8 hours to obtain a semi-finished heat-conducting silicon rubber composite material;
and vulcanizing the dried unvulcanized semi-finished heat-conducting silicone rubber composite material at room temperature for 120min, and trimming to obtain the heat-conducting silicone rubber composite material product.
Example 2
Adding 6g of carbon-coated copper nanoparticles with the average particle size of 80nm into 100g of cyclohexane, and performing ultrasonic dispersion for 30min under the condition that the ultrasonic power is 1200W to obtain a mixed solution;
adding 0.015g of citric acid into the mixed solution, stirring and dispersing, simultaneously adding 0.015g of silane coupling agent KBM-503 and 0.015g of silane coupling agent KBM-602 respectively under a stirring state, and keeping stirring for 20min to obtain a cyclohexane dispersion liquid;
dissolving 30g of methyl vinyl silicone rubber in the cyclohexane dispersion liquid to prepare a silicone rubber solution;
respectively adding 0.6g of bis 2, 5 silicon rubber vulcanizing agent and 0.015g of terephthalaldehyde into a silicon rubber solution, uniformly dispersing in a stirring mode, and grinding in a ball mill for 2 hours to obtain silicon rubber slurry with uniformly dispersed heat-conducting filler;
uniformly introducing the silicon rubber slurry into a mold, and drying in a vacuum drying oven at normal temperature for 8 hours to obtain a semi-finished heat-conducting silicon rubber composite material;
and vulcanizing the dried unvulcanized semi-finished heat-conducting silicone rubber composite material at room temperature for 150min, and trimming to obtain the heat-conducting silicone rubber composite material product.
Example 3
Adding 3g of carbon-coated aluminum nanoparticles with the average particle size of 100nm into 100g of tetrahydrofuran, and performing ultrasonic dispersion for 40min under the condition that the ultrasonic power is 1200W to obtain a mixed solution;
adding 0.01g of acetic acid into the mixed solution, stirring and dispersing, simultaneously adding 0.01g of silane coupling agent Z-6030 and 0.01g of silane coupling agent Z-6011 respectively under a stirring state, and keeping stirring for 20min to obtain a tetrahydrofuran dispersion liquid;
dissolving 30g of methyl vinyl silicone rubber in the tetrahydrofuran dispersion liquid to prepare a silicone rubber solution;
respectively adding 0.45g of bis 2, 5 silicon rubber vulcanizing agent and 0.01g of terephthalaldehyde into a silicon rubber solution, uniformly dispersing in a stirring mode, and then ball-milling in a ball mill for 24 hours to obtain silicon rubber slurry with uniformly dispersed heat-conducting filler;
uniformly introducing the silicon rubber slurry into a mold, and drying in a vacuum drying oven at normal temperature for 8 hours to obtain a semi-finished heat-conducting silicon rubber composite material;
and (3) putting the dried unvulcanized semi-finished heat-conducting silicone rubber composite material on a flat vulcanizing machine for vulcanizing under the vulcanizing pressure of 20MPa for 120min, and trimming to obtain the heat-conducting silicone rubber composite material product.
Example 4
Adding 1.5g of carbon-coated aluminum nanoparticles with the average particle size of 120nm into 100g of gasoline, and performing ultrasonic dispersion for 30min under the condition that the ultrasonic power is 1000W to obtain a mixed solution;
adding 0.01g of acetic acid into the mixed solution, stirring and dispersing, simultaneously adding 0.01g of silane coupling agent A-174 and 0.01g of silane coupling agent A-1110 respectively under the stirring state, and keeping stirring for 20min to obtain gasoline dispersion;
dissolving 30g of methyl vinyl silicone rubber in the gasoline dispersion to prepare a silicone rubber solution;
respectively adding 0.6g of bis 2, 5 silicon rubber vulcanizing agent and 0.01g of terephthalaldehyde into a silicon rubber solution, uniformly dispersing in a stirring mode, and grinding in a ball mill for 20 hours to obtain silicon rubber slurry with uniformly dispersed heat-conducting filler;
uniformly introducing the silicon rubber slurry into a mold, and drying in a vacuum drying oven at normal temperature for 8 hours to obtain a semi-finished heat-conducting silicon rubber composite material;
and vulcanizing the dried unvulcanized semi-finished heat-conducting silicone rubber composite material at room temperature for 180min, and trimming to obtain the heat-conducting silicone rubber composite material product.
The heat-conducting silicone rubber composite materials prepared in examples 1 to 4 were subjected to comprehensive performance tests, and numbered as 1, 2, 3, and 4, and the obtained results are shown in table 1:
TABLE 1 comprehensive Properties of thermally conductive Silicone rubber composites
As can be seen from table 1: the heat-conducting silicone rubber composite material prepared by the preparation method of the heat-conducting silicone rubber composite material suitable for rail transit has the characteristics of high heat conductivity coefficient and low thermal expansion coefficient, is in the same level as a metal material, and can be well matched in the heat conduction process to prevent deformation and new gaps caused by thermal expansion.
The above examples are merely illustrative of several embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (10)
1. A preparation method of a heat-conducting silicone rubber composite material suitable for rail transit is characterized by comprising the following steps,
preparing an organic solvent;
adding a heat-conducting filler into an organic solvent to obtain a mixed solution;
respectively and sequentially adding organic acid, a silane coupling agent with amino and a silane coupling agent with vinyl into the mixed solution, and uniformly stirring to obtain a dispersion liquid;
adding silicon rubber into the dispersion liquid for dissolving to obtain a silicon rubber solution;
adding a vulcanizing agent and a cross-linking agent into a silicone rubber solution for uniform dispersion, and grinding until a heat-conducting filler is uniformly dispersed in the silicone rubber solution to obtain silicone rubber slurry;
and (3) introducing the silicon rubber slurry into a mold, fully drying, carrying out mold pressing vulcanization molding, and trimming to obtain the heat-conducting silicon rubber composite material.
2. The method for preparing a heat-conducting silicone rubber composite material suitable for rail transit according to claim 1, wherein: the silane coupling agent with amino and the silane coupling agent with vinyl are proportioned according to the weight ratio of 1: 1.
3. The method for preparing a heat-conducting silicone rubber composite material suitable for rail transit according to claim 1, wherein: the silicone rubber is methyl vinyl silicone rubber with Shore A hardness of 20-100 degrees, and the mass fraction of the silicone rubber in the silicone rubber solution is 20-80%.
4. The method for preparing a heat-conducting silicone rubber composite material suitable for rail transit according to claim 1, wherein: the heat-conducting filler is carbon-coated metal nanoparticles, the particle size of the heat-conducting filler is 10 nm-200 nm, and the total weight of the heat-conducting filler is 5% -50% of the weight of the silicone rubber.
5. The method for preparing a heat-conducting silicone rubber composite material suitable for rail transit according to claim 1, wherein: the organic acid is one or two of acetic acid and citric acid, and the weight of the organic acid is 0.001-1% of the total weight of the heat-conducting filler.
6. The method for preparing a heat-conducting silicone rubber composite material suitable for rail transit according to claim 1, wherein: the silane coupling agent with amino can be one or more than two of silane coupling agents KH-550, Dow Corning Z-6011, A-1110 and KBM-602, and the weight of the silane coupling agent with amino is 0.1-5% of the total weight of the heat-conducting filler.
7. The method for preparing a heat-conducting silicone rubber composite material suitable for rail transit according to claim 1, wherein: the coupling agent with vinyl can be one or more than two of silane coupling agent KH-570, Dow Corning Z-6030, A-174 or KBM-503, and the weight of the coupling agent with vinyl is 0.1-5% of the total weight of the heat-conducting filler.
8. The method for preparing a heat-conducting silicone rubber composite material suitable for rail transit according to claim 1, wherein: the vulcanizing agent is a bis 2, 5 vulcanizing agent, and the weight of the vulcanizing agent is 0.5-5.0% of the weight of the silicon rubber.
9. The method for preparing a heat-conducting silicone rubber composite material suitable for rail transit according to claim 1, wherein: the crosslinking agent is one or two of terephthalaldehyde or trimeldehyde, the weight of the crosslinking agent is 0.1% -5% of the total weight of the heat-conducting filler, and the weight of the crosslinking agent is the same as that of the silane coupling agent with amino.
10. The method for preparing the heat-conducting silicone rubber composite material suitable for rail transit according to claim 1, wherein the step of introducing the silicone rubber slurry into a mold, fully drying, molding, vulcanizing, forming and trimming to obtain the heat-conducting silicone rubber composite material comprises the following specific operations:
uniformly introducing the silicon rubber slurry into a mold;
putting the mould into a drying device for drying treatment to obtain a semi-finished product of the heat-conducting silicone rubber composite material;
and vulcanizing the dried and unvulcanized semi-finished heat-conducting silicone rubber composite material, and trimming to obtain the heat-conducting silicone rubber composite material.
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| CN102153955A (en) * | 2010-11-23 | 2011-08-17 | 广东工业大学 | Preparation method of heat conduction paster adopting fiber glass mesh as supporting structure |
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| CN102153955A (en) * | 2010-11-23 | 2011-08-17 | 广东工业大学 | Preparation method of heat conduction paster adopting fiber glass mesh as supporting structure |
| CN105524469A (en) * | 2014-11-27 | 2016-04-27 | 比亚迪股份有限公司 | Heat-conducting glue and its preparation method and use |
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