CN104893307A - Heat-conduction electric-insulation rubber-plastic composite material and preparation method thereof - Google Patents
Heat-conduction electric-insulation rubber-plastic composite material and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a heat-conduction electric-insulation rubber-plastic composite material and a preparation method thereof. The heat-conduction electric-insulation rubber-plastic composite material is prepared from the following raw materials in parts by mass: 40-80 parts of rubber matrix, 0-50 parts of heat-conduction electric-insulation filler, 10-40 parts of plastic matrix, 2-5 parts of vulcanizing agent, 3-7 parts of antioxidant and 2-5 parts of silane coupling agent. The preparation method comprises the following steps: carrying out surface modification on the heat-conduction electric-insulation filler by using the coupling agent, carrying out banburying and mixing, carrying out cold-press molding, and carrying out high-temperature vulcanization. The heat-conduction electric-insulation rubber-plastic composite material has higher heat conductivity under the condition of lower filler amount, and maintains excellent electric insulation properties. The blending of the rubber and plastic materials can enhance the mechanical properties of the composite material, and can satisfy the requirements for heat-conducting property and electric-insulating property in a complex mechanical environment.
Description
Technical field
The invention belongs to chemical field, relate to a kind of composite, particularly a kind of heat conductive insulating composite rubber-plastic material and preparation method thereof.
Background technology
Silicon rubber has good resistance toheat, is widely used in the every field in national economy and national defense industry.Methyl ethylene class silicon rubber is that a class can the silicon rubber of high-and low-temperature resistance, life-time service at-50 ~ 250 DEG C and electrical insulation capability is excellent.Be used widely in automobile making, daily necessities, electric and aerospace from since exploitation, but himself antidamping poor-performing.The people such as Cheng Qingmin adopt rubber and plastic to mix and improve its damping mechanical property, but thermal conductivity is lower, cannot meet the requirement of complicated mechanical environment and high heat conductance simultaneously, thus limit the application of rubber product.
The main method of current raising macromolecular material heat conductivility fills the insulating ceramic filler with high heat conductance, and as aluminum oxide, boron nitride, aluminium nitride etc., general needs reach very high filler loading level and could form thermal conducting path, improve thermal conductivity.Simultaneously because the consistency between inorganic powder filler and organic matrix is poor, a large amount of inorganic powder fillers adds allows the mechanical property of matrix material greatly decline.The present invention oozes theory according to two the exceeding in electro-conductive material, be introduced in heat-conducting insulation material, choose two kinds of mutual exclusive matrixes, Fillers selection be distributed in a certain matrix, reduce filler threshold value to be formed " heat conduction two exceeding oozes ", be issued to good thermal conductivity at less filling fraction, ensure that the mechanical property of matrix material simultaneously, the requirement to heat conductivility and insulating property under complicated mechanical environment can be met.
Summary of the invention
For shortcoming and the deficiency of prior art, the object of the present invention is to provide a kind of heat conductive insulating composite rubber-plastic material, the heat conductive insulating composite rubber-plastic material adopting the inventive method to prepare has higher thermal conductivity under less filler is filled, also maintain excellent electrical insulation capability and mechanical property simultaneously, can be applicable to Code in Hazardous Special Locations electrical isolation had higher requirements under hot conditions and the requirement meeting complicated mechanical environment.
For achieving the above object, the present invention adopts following technical scheme:
A kind of heat conductive insulating composite rubber-plastic material is prepared from by the raw material of following mass fraction:
The rubber-like matrix of 40 ~ 80 parts, the heat-conductive insulation filling of 0 ~ 50 part, Plastic matrix, vulcanizing agent 2 ~ 5 parts, 3 ~ 7 parts, oxidation inhibitor, the silane coupling agent 2 ~ 5 parts of 10 ~ 40 parts.
As the further scheme of the present invention: described rubber-like matrix is any one or its composition of methyl vinyl silicone rubber (MVQ), natural rubber (NR), terpolymer EP rubber (EPDM), styrene-butadiene rubber(SBR) (SBR).
As the further scheme of the present invention: described rubber-like matrix add-on is preferably 60 parts.
As the further scheme of the present invention: described Plastic matrix be ethylene-vinyl acetate (EVA), Low Density Polyethylene (LDPE), high density polyethylene(HDPE) (HDPE), polypropylene (PP), any one or its composition.
As the further scheme of the present invention: described Plastic matrix add-on is preferably 20 parts.
As the further scheme of the present invention: described heat-conductive insulation filling is hexagonal flake boron nitride (h-BN), aluminium nitride (AlN), silicon carbide whisker (SiC), aluminum oxide (Al
2o
3) any one or its composition.
As the further scheme of the present invention: described heat-conductive insulation filling add-on is preferably 30 parts.
As the further scheme of the present invention: described vulcanizing agent add-on preferably 3 parts.
As the further scheme of the present invention: described added quantity of antioxidant preferably 5 parts.
As the further scheme of the present invention: described silane coupling agent add-on preferably 3 parts.
A preparation method for heat conductive insulating composite rubber-plastic material, comprises the following steps:
(1) coupling agent being dissolved in ethanol massfraction is in the ethanol-water solution of 70 ~ 95%, is mixed with the coupling agent ethanol-water solution that coupling agent concentrations is 0.5 ~ 5wt%;
(2) by heat-conductive insulation filling in advance temperature be 100 ~ 130 DEG C, volumetric molar concentration be in the soda-lye of 1 ~ 5mol/L react 15 ~ 20h, then filtration, drying, then put into coupling agent ethanol-water solution and react 4 ~ 6h at 60 ~ 80 DEG C, obtain the heat-conductive insulation filling after surface grafting coupling agent;
(3) heat-conductive insulation filling after surface grafting coupling agent is mixed with rubber-like matrix, Plastic matrix, oxidation inhibitor, vulcanizing agent banburying, then rubber unvulcanizate is placed in mould coldmoulding, both must this heat conductive insulating composite rubber-plastic material.
(4) described step (3) coldmoulding pressure is 5 ~ 25MPa, and time length 20 ~ 40s is warming up to 140 ~ 200 DEG C, and temperature rise rate is 5 ~ 15 DEG C/min, sulfidization molding pressure 10 ~ 20MPa, curing time 25 ~ 40min; Temperature rise rate is preferably 7 DEG C/min.
The invention has the beneficial effects as follows: the present invention adds heat-conductive insulation filling in two kinds of matrixes, theoretical according to " two exceeding oozes " in electro-conductive material, because the specific surface energy of storeroom is different in thermally conductive material, filler can be selectively distributed in a class matrix, therefore under lower loading level, filler overlaps mutually, form thermal conducting path, heat conductivility can be improved under lower filling number; The elasticity simultaneously namely obtaining rubber after rubber and plastic two kinds of body material compounds got back the intensity of plastics make compound after the mechanical property of matrix material greatly improve, the use under complicated mechanical environment can be met; Adopt the heat conductive insulating composite rubber-plastic material prepared of the present invention to have higher thermal conductivity, excellent electrical insulation capability, also has good mechanical property simultaneously, can meet the requirement to heat conduction, electrical insulating property under complicated mechanical environment.
Embodiment
Below in conjunction with specific embodiment, the present invention is further elaborated.
Embodiment 1
The preparation method of the present embodiment heat conductive insulating composite rubber-plastic material is as follows:
(1) be in the ethanol-water solution of 75% by the ethanol massfraction that 0.5 gram of coupling agent (A-172) is dissolved in 250ml, be mixed with coupling agent ethanol-water solution; By 25 parts of aluminium nitride in advance temperature be 110 DEG C, volumetric molar concentration is react 18h in the 250ml soda-lye of 2mol/L, then to filter, dry.Then put into coupling agent ethanol-water solution and react 4h at 60 DEG C, obtain the aluminium nitride after surface grafting coupling agent.
(2) after 20 grams of natural rubbers (NR) being plastified 20min in Banbury mixer, the aluminium nitride (AlN) (1) obtained adds Banbury mixer and continues mixing 10min, finally add 40 grams of EVA, 2 grams of antioxidant 1010s are placed in Banbury mixer and mix together with 1 gram of vulcanizing agent (two 2.5), then rubber unvulcanizate is placed in mould and carries out coldmoulding, forming pressure 5MPa, time length 30s, cold pressing 5 times repeatedly.Then temperature rise rate is that 5 DEG C/min is warming up to 150 DEG C, and under 150 DEG C of extra electric fields, carry out sulfuration 30min, the demoulding obtains heat conductive insulating composite rubber-plastic material.Test the heat conductivility of this heat conductive insulating composite rubber-plastic material, insulating property and mechanical property, result is as shown in table 1.
Embodiment 2
The preparation method of the present embodiment heat conductive insulating composite rubber-plastic material is as follows:
(1) be in the ethanol-water solution of 85% by the ethanol massfraction that 1.5 grams of coupling agents (A-172) are dissolved in 250ml, be mixed with coupling agent ethanol-water solution; By 30 grams of hexagonal flake boron nitride in advance temperature be 100 DEG C, volumetric molar concentration is react 15h in the 250ml soda-lye of 2.5mol/L, then to filter, dry.Then put into coupling agent ethanol-water solution and react 5h at 70 DEG C, obtain the hexagonal flake boron nitride after surface grafting coupling agent.
(2) after 60 grams of terpolymer EP rubbers (EPDM) and silicon rubber (MVQ) being plastified 20min in Banbury mixer, the hexagonal flake boron nitride (h-BN) step (1) obtained adds Banbury mixer and continues mixing 10min, finally add 30 grams of polyethylene (PE), 3 grams of antioxidant 1010s are placed in Banbury mixer and mix together with 1.5 grams of vulcanizing agents (two 2.5), then rubber unvulcanizate is placed in mould and carries out coldmoulding, forming pressure 10MPa, time length 20s, colds pressing 5 times repeatedly.Then temperature rise rate is that 7 DEG C/min is warming up to 160 DEG C, and under 160 DEG C of extra electric fields, carry out sulfuration 30min, the demoulding obtains heat conductive insulating composite rubber-plastic material.Test the heat conductivility of this heat conductive insulating composite rubber-plastic material, insulating property and mechanical property, result is as shown in table 1.
Embodiment 3
The preparation method of the present embodiment heat conductive insulating composite rubber-plastic material is as follows:
(1) be in the ethanol-water solution of 90% by the ethanol massfraction that 3 grams of coupling agents (A-172) are dissolved in 250ml, be mixed with coupling agent ethanol-water solution; By 50 grams of hexagonal flake boron nitride (h-BN) and aluminum oxide (Al
2o
3) in advance temperature be 120 DEG C, volumetric molar concentration is react 18h in the 250ml soda-lye of 4mol/L, then to filter, dry.Then put into coupling agent ethanol-water solution and react 4h at 80 DEG C, obtain the hexagonal flake boron nitride after surface grafting coupling agent.
(2) after 60 grams of methyl vinyl silicone rubbers (MVQ) being plastified 25min in Banbury mixer, the hexagonal flake boron nitride (h-BN) (1) obtained adds Banbury mixer and continues mixing 10min, finally add 40 grams of polypropylene (PP), 5 grams of antioxidant 1010s are placed in Banbury mixer and mix together with 2 grams of vulcanizing agents (two 2.5), then rubber unvulcanizate is placed in mould and carries out coldmoulding, forming pressure 15MPa, time length 35s, colds pressing 5 times repeatedly.Then temperature rise rate is that 10 DEG C/min is warming up to 170 DEG C, and under 170 DEG C of extra electric fields, carry out sulfuration 40min, the demoulding obtains heat conductive insulating composite rubber-plastic material.Test the heat conductivility of this heat conductive insulating composite rubber-plastic material, insulating property and mechanical property, result is as shown in table 1.
Embodiment 4
The preparation method of the present embodiment heat conductive insulating composite rubber-plastic material is as follows:
(1) be in the ethanol-water solution of 95% by the ethanol massfraction that 2.5 grams of coupling agents (A-172) are dissolved in 250ml, be mixed with coupling agent ethanol-water solution; By 50 grams of silicon carbide whiskers (SiC) and aluminium nitride (AlN) in advance temperature be 130 DEG C, volumetric molar concentration is react 18h in the 250ml soda-lye of 5mol/L, then to filter, dry.Then put into coupling agent ethanol-water solution and react 6h at 80 DEG C, obtain the hexagonal flake boron nitride after surface grafting coupling agent.
(2) after 60 grams of methyl vinyl silicone rubbers (MVQ) and styrene-butadiene rubber(SBR) (SBR) being plastified 25min in Banbury mixer, the silicon carbide (SiC) step (1) obtained adds Banbury mixer and continues mixing 10min, finally add 30 grams of ethylene-vinyl acetates (EVA), 5 grams of antioxidant 1010s are placed in Banbury mixer and mix together with 3 grams of vulcanizing agents (two 2.5), then rubber unvulcanizate is placed in mould and carries out coldmoulding, forming pressure 25MPa, time length 30s, colds pressing 5 times repeatedly.Then temperature rise rate is that 13 DEG C/min is warming up to 180 DEG C, and under 180 DEG C of extra electric fields, carry out sulfuration 20min, the demoulding obtains heat conductive insulating composite rubber-plastic material.Test the heat conductivility of this heat conductive insulating composite rubber-plastic material, insulating property and mechanical property, result is as shown in table 1.
Embodiment 5
The preparation method of the present embodiment heat conductive insulating composite rubber-plastic material is as follows:
(1) be in the ethanol-water solution of 95% by the ethanol massfraction that 3 grams of coupling agents (A-172) are dissolved in 250ml, be mixed with coupling agent ethanol-water solution; By 30 grams of hexagonal flake boron nitride in advance temperature be 110 DEG C, volumetric molar concentration is react 18h in the 250ml soda-lye of 5mol/L, then to filter, dry.Then put into coupling agent ethanol-water solution and react 5h at 80 DEG C, obtain the hexagonal flake boron nitride after surface grafting coupling agent.
(2) after 60 grams of methyl vinyl silicone rubbers (MVQ) being plastified 25min in Banbury mixer, the hexagonal flake boron nitride (h-BN) step (1) obtained adds Banbury mixer and continues mixing 10min, finally add 30 grams of ethylene-vinyl acetates (EVA), 7 grams of antioxidant 1010s are placed in Banbury mixer and mix together with 4 grams of vulcanizing agents (two 2.5), then rubber unvulcanizate is placed in mould and carries out coldmoulding, forming pressure 17MPa, time length 40s, colds pressing 5 times repeatedly.Then temperature rise rate is that 15 DEG C/min is warming up to 200 DEG C, and under 200 DEG C of extra electric fields, carry out sulfuration 25min, the demoulding obtains heat conductive insulating composite rubber-plastic material.Test the heat conductivility of this heat conductive insulating composite rubber-plastic material, insulating property and mechanical property, result is as shown in table 1.
The various performance parameters of table 1 heat conductive insulating composite rubber-plastic material of the present invention
Obviously, embodiment described above is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Claims (10)
1. a heat conductive insulating composite rubber-plastic material, is characterized in that, is to be prepared from by the raw material of following mass fraction:
The rubber-like matrix of 40 ~ 80 parts, the heat-conductive insulation filling of 0 ~ 50 part, Plastic matrix, vulcanizing agent 2 ~ 5 parts, 3 ~ 7 parts, oxidation inhibitor, the silane coupling agent 2 ~ 5 parts of 10 ~ 40 parts.
2. heat conductive insulating composite rubber-plastic material as claimed in claim 1, is characterized in that: described rubber-like matrix is any one or its composition of methyl vinyl silicone rubber (MVQ), natural rubber (NR), terpolymer EP rubber (EPDM), styrene-butadiene rubber(SBR) (SBR).
3. heat conductive insulating composite rubber-plastic material as claimed in claim 1, is characterized in that: described rubber-like matrix add-on is preferably 60 parts.
4. heat conductive insulating composite rubber-plastic material as claimed in claim 1, is characterized in that: described Plastic matrix be ethylene-vinyl acetate (EVA), Low Density Polyethylene (LDPE), high density polyethylene(HDPE) (HDPE), polypropylene (PP), any one or its composition.
5. heat conductive insulating composite rubber-plastic material as claimed in claim 1, is characterized in that: described Plastic matrix add-on is preferably 20 parts.
6. as claim 1 the heat conductive insulating composite rubber-plastic material told, it is characterized in that: described heat-conductive insulation filling is hexagonal flake boron nitride (h-BN), aluminium nitride (AlN), silicon carbide whisker (SiC), aluminum oxide (Al
2o
3) any one or its composition.
7. as claim 1 the heat conductive insulating composite rubber-plastic material told, it is characterized in that: described heat-conductive insulation filling add-on is preferably 30 parts.
8. heat conductive insulating composite rubber-plastic material as claimed in claim 1, is characterized in that: described vulcanizing agent add-on is preferably 3 parts.
9. heat conductive insulating composite rubber-plastic material as claimed in claim 1, it is characterized in that: described added quantity of antioxidant is preferably 5 parts, silane coupling agent add-on is preferably 3 parts.
10. the preparation method of the heat conductive insulating composite rubber-plastic material as described in as arbitrary in claim 1 ~ 9, is characterized in that, comprise the following steps:
(1) coupling agent being dissolved in ethanol massfraction is in the ethanol-water solution of 70 ~ 95%, is mixed with the coupling agent ethanol-water solution that coupling agent concentrations is 0.5 ~ 5wt%;
(2) by heat-conductive insulation filling in advance temperature be 100 ~ 130 DEG C, volumetric molar concentration be in the soda-lye of 1 ~ 5mol/L react 15 ~ 20h, then filtration, drying, then put into coupling agent ethanol-water solution and react 4 ~ 6h at 60 ~ 80 DEG C, obtain the heat-conductive insulation filling after surface grafting coupling agent;
(3) heat-conductive insulation filling after surface grafting coupling agent is mixed with rubber-like matrix, Plastic matrix, oxidation inhibitor, vulcanizing agent banburying, then rubber unvulcanizate is placed in mould coldmoulding, both must this heat conductive insulating composite rubber-plastic material.
(4) described step (3) coldmoulding pressure is 5 ~ 25MPa, and time length 20 ~ 40s is warming up to 140 ~ 200 DEG C, and temperature rise rate is 5 ~ 15 DEG C/min, sulfidization molding pressure 10 ~ 20MPa, curing time 25 ~ 40min.
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| CN105238055A (en) * | 2015-09-25 | 2016-01-13 | 宿松县焕然机电有限责任公司 | Motor slot wedge heat-resistance insulation composite material and preparation method thereof |
| CN105315670A (en) * | 2015-11-24 | 2016-02-10 | 苏州盖德精细材料有限公司 | High-heat-conductivity electronic encapsulation composite and preparing method thereof |
| CN105602250A (en) * | 2016-01-05 | 2016-05-25 | 安徽一招百势训练器材研究开发有限公司 | External wrapping material of bodybuilding reverse-Y-shaped trainer |
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| WO2017216484A1 (en) * | 2016-06-15 | 2017-12-21 | Compagnie Generale Des Etablissements Michelin | Reinforced rubber composition for tires |
| WO2018010225A1 (en) * | 2016-07-14 | 2018-01-18 | 无锡市东北塘永丰橡塑厂 | Wear-resistant rubber plastic material |
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| CN110698734B (en) * | 2019-10-30 | 2021-08-27 | 华南理工大学 | Nano-selenium heat-conducting and insulating rubber material and preparation method and application thereof |
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