Self-healing thermally conductive silicone rubber for connectors and method of making same
By end-capping polyborosiloxane, self-healing thermally conductive silicone rubber was prepared, which solved the problem of fatigue damage of thermally conductive silicone rubber at high temperatures, improved thermal conductivity and insulation performance, and extended the service life of equipment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- 四川迈思能新材料科技有限公司
- Filing Date
- 2026-03-16
- Publication Date
- 2026-06-12
AI Technical Summary
Existing thermally conductive silicone rubber is prone to irreversible fatigue damage under prolonged high-temperature environments, leading to decreased thermal conductivity and compromised insulation performance, thus posing a potential hazard to equipment operation.
POSS-NH2 was used to end-cap polyborosiloxane to enhance its stability and mechanical properties. This polyborosiloxane was then added to thermally conductive silicone rubber to prepare a self-healing thermally conductive silicone rubber, thereby improving product reliability and lifespan.
This technology improves the thermal conductivity stability and insulation performance of self-healing thermally conductive silicone rubber in high-temperature environments, thereby extending the service life of equipment.
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Figure CN122188402A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of silicone rubber technology, specifically to a self-healing thermally conductive silicone rubber for connectors and its preparation method. Background Technology
[0002] Modern electronic and electrical equipment is rapidly developing towards higher integration and higher power density, making efficient thermal management a key factor in ensuring equipment reliability and lifespan. Electrical connectors, as crucial components in circuit systems, directly impact the safe operation of the entire device. During prolonged use, connectors accumulate heat due to factors such as contact resistance. If this heat cannot be dissipated promptly, it leads to increased contact temperature, accelerated oxidation, increased connection resistance, performance degradation, and even serious malfunctions such as short circuits or fires. Therefore, equipping critical electrical connectors with a protective sleeve that provides both insulation and efficient heat conduction has become an important technical means to ensure the safe and stable operation of connectors.
[0003] Therefore, developing highly efficient thermally conductive materials has become crucial for ensuring equipment stability and extending its service life. Silicone rubber, as an excellent material, has a main chain composed of high-energy -Si-O- bonds, exhibiting good stability and resistance to high and low temperatures, enabling it to operate normally within a wide temperature range of -60℃ to 200℃. Simultaneously, silicone rubber also possesses excellent flexibility, weather resistance, chemical stability, electrical insulation, and good processability. Therefore, thermally conductive silicone rubber has become one of the ideal materials for connector protective sleeves. Thermally conductive silicone rubber devices prepared by molding can fit tightly to the connector, effectively dissipating heat.
[0004] However, it is important to note that under prolonged high-temperature conditions, thermally conductive silicone rubber may suffer irreversible fatigue damage due to the continuous accumulation of thermal stress. Furthermore, during transportation and installation, minute scratches or cracks may appear on the surface of the protective sleeve. These minor damages will gradually expand over time, eventually penetrating the entire material, leading to a decrease in the thermal conductivity of the protective sleeve and affecting its insulation performance, thus becoming a potential hazard during equipment operation. Summary of the Invention
[0005] The purpose of this invention is to provide a self-healing thermally conductive silicone rubber for connectors and its preparation method, which solves the technical problem that in the prior art, thermally conductive silicone rubber may suffer irreversible fatigue damage due to continuous thermal stress accumulation under long-term high-temperature environment, resulting in a decrease in the thermal conductivity of the protective sleeve and an impact on the insulation and protection performance, becoming a potential hidden danger in equipment operation.
[0006] This invention discloses a self-healing thermally conductive silicone rubber for connectors, comprising the following components by weight: 70-100 parts of methyl vinyl silicone rubber, 20-40 parts of polyborosiloxane, 10-30 parts of silica, 450-1250 parts of filler, 5-10 parts of dimethyl silicone oil, 1-3 parts of hydrogen-containing silicone oil, and 0.5-1 part of platinum catalyst.
[0007] Furthermore, the methyl vinyl silicone rubber is a vinyl-terminated raw silicone material with a molecular weight of 450,000-600,000 and a vinyl content of 0.08%.
[0008] Furthermore, the hydrogen content of the hydrogen-containing silicone oil is 0.5%-1%.
[0009] Furthermore, the filler is one or more of hexagonal boron nitride, spherical alumina, or spherical zinc oxide.
[0010] Furthermore, by weight, the filler comprises 50-100 parts of hexagonal boron nitride, 300-700 parts of alumina, and 100-450 parts of zinc oxide.
[0011] Furthermore, the hexagonal boron nitride has a micron-sized particle size of 5-10 μm.
[0012] Furthermore, the spherical alumina has a micron-sized particle size of 10-50 μm.
[0013] Furthermore, the spherical zinc oxide has a micron-sized particle size of 5-20 μm.
[0014] By using filler gradation, a heat conduction network can be effectively constructed to optimize the heat conduction effect.
[0015] Furthermore, the silica is produced by a gas-phase method.
[0016] A method for preparing self-healing thermally conductive silicone rubber for connectors, wherein the synthesis method of the polyborosiloxane includes the following steps: adding boric acid compounds and hydroxyl silicone oil to an organic solvent to carry out a dehydration condensation reaction for 4-6 hours, then adding an end-capping agent, adjusting the pH, controlling the temperature and continuing the reaction for 3-4 hours, and then washing and filtering to obtain the polyborosiloxane.
[0017] Furthermore, the dehydration condensation reaction temperature is 100-120℃.
[0018] Furthermore, during the dehydration condensation reaction, the solvent is refluxed to remove moisture and accelerate the reaction rate.
[0019] Furthermore, the pH value is 8-10, and the temperature for temperature control is between 40-60°C.
[0020] Furthermore, the pH is adjusted by an alkaline solution, which is an aqueous solution of potassium hydroxide with a molar concentration of 1-3 mol / L.
[0021] Furthermore, 16-20 parts of the boric acid compound are added by weight.
[0022] Furthermore, the hydroxyl silicone oil is a hydroxyl-terminated silicone oil.
[0023] Furthermore, the hydroxyl silicone oil is one or more of hydroxyl vinyl silicone oil, hydroxyl silicone oil, hydroxyl phenyl silicone oil, or hydroxyl hydrogen silicone oil, with a viscosity of 500~3500 mPa·s.
[0024] Furthermore, the capping agent is aminopropyl heptaisobutyl cage-like polysilsesquioxane (POSS-NH2).
[0025] Furthermore, by weight, 2-8 parts of the capping agent aminopropyl heptaisobutyl cage polysilsesquioxane (POSS-NH2) and 80-100 parts of the hydroxyl silicone oil are added.
[0026] Furthermore, the organic solvent is added in 500-600 parts by weight.
[0027] Furthermore, the organic solvent is selected from at least one of toluene, chloroform, n-hexane, or tetrahydrofuran.
[0028] Compared with the prior art, the beneficial effects of the present invention are: 1. POSS-NH2 was used to end-cap polyborosiloxane to enhance its stability and mechanical properties. This polyborosiloxane was then added to thermally conductive silicone rubber to prepare a self-healing thermally conductive silicone rubber, which improves product reliability and lifespan. Attached Figure Description
[0029] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0030] Figure 1 This is a diagram illustrating the self-healing effect of Embodiment 1 of the present invention. Detailed Implementation
[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.
[0032] Example 1 This embodiment discloses a self-healing thermally conductive silicone rubber for connectors and its preparation method. By weight, it comprises the following components: 100 parts of hydroxyl silicone oil; 20 parts of phenylboronic acid; POSS-NH 24 copies; 600 parts of chloroform; 2.5 parts potassium hydroxide solution; The viscosity of the hydroxyl silicone oil is 1000 mPa·s; the molar concentration of the potassium hydroxide solution is 2 mol / L.
[0033] The preparation method is as follows: Benzylboronic acid and hydroxyl silicone oil are added to a chloroform solution, and the temperature is raised to 100℃ to allow them to undergo a dehydration condensation reaction for 4 hours. During the reaction, the solvent is refluxed to remove moisture and accelerate the reaction rate. Subsequently, POSS-NH2 is added, and the pH is adjusted to 9.5 with potassium hydroxide solution. The temperature is controlled at 50℃ for 3.5 hours, followed by washing and filtration to obtain the synthesized self-healing polyborosiloxane. The reaction formula of Benzylboronic acid and hydroxyl silicone oil is: .
[0034] A self-healing thermally conductive silicone rubber, comprising the following components by weight: 80 parts of methyl vinyl silicone rubber; 20 parts of polyborosiloxane; 15 parts of silica; 60 parts of hexagonal boron nitride; 450 parts of spherical alumina; 150 parts of spherical zinc oxide; 1.5 parts of hydrogen-containing silicone oil; 5 parts dimethyl silicone oil; 0.5 parts platinum catalyst; The methyl vinyl silicone rubber has a vinyl content of 0.8 mol% and a molecular weight of 450,000; the hydrogen content of the hydrogen-containing silicone oil is 1 mol%; and the viscosity of the dimethyl silicone oil is 500 mPa / s.
[0035] The preparation method is as follows: 80 parts of methyl vinyl silicone rubber and 20 parts of polyoxymethylene siloxane are placed in a mixer, then 15 parts of silica and 1.5 parts of hydrogen-containing silicone oil are added and the mixture is stirred for 1 hour until it is uniformly mixed; then 60 parts of hexagonal boron nitride, 450 parts of alumina, 150 parts of zinc oxide and 5 parts of dimethyl silicone oil are added and stirred for 1.5 hours; then the mixture is vacuum kneaded in a kneader for 30 minutes; then the material is discharged, and 0.5 parts of platinum catalyst are added to a two-roll mill and the mixture is sheeted; after sheeting, the mixture is vulcanized in a hot press at 160°C for 20 minutes, then the temperature is raised to 180°C and vulcanized for another 4 hours. After cooling, the product is packaged and shipped.
[0036] The reaction formula between aminopropyl heptaisobutyl cage-like polysilsesquioxane and polyborosiloxane: .
[0037] The measured thermal conductivity is 2.5 W (mk), the hardness is 64 A, the tensile strength is 3.4 MPa, and the elongation at break is 120%.
[0038] Example 2: A self-healing polyborosiloxane. By weight, it comprises the following components: 100 parts of hydroxyphenyl silicone oil; 25 parts of phenylboronic acid; POSS-NH 25 portions; 550 parts of toluene; Three portions of potassium hydroxide solution; The viscosity of the hydroxyphenyl silicone oil is 2000 mPa·s; the molar concentration of the potassium hydroxide solution is 2 mol / L.
[0039] The preparation method is as follows: Benzylboronic acid and hydroxyphenyl silicone oil are added to a toluene solution, and the temperature is raised to 120℃ to allow them to undergo a dehydration condensation reaction for 6 hours. During the reaction, the solvent is refluxed to remove moisture and accelerate the reaction rate. Subsequently, POSS-NH2 is added, and the pH is adjusted to 11 with potassium hydroxide solution. The temperature is controlled at 60℃ for 4 hours, followed by washing and filtration to obtain the synthesized self-healing polyborosiloxane.
[0040] A self-healing thermally conductive silicone rubber. By weight, it comprises the following components: 80 parts of methyl vinyl silicone rubber; 20 parts of polyborosiloxane; 20 parts of silica; 80 parts of hexagonal boron nitride; 550 parts of spherical alumina; 200 parts of spherical zinc oxide; 3 parts hydrogen-containing silicone oil; 5 parts dimethyl silicone oil; 0.5 parts platinum catalyst; The methyl vinyl silicone rubber has a vinyl content of 0.8 mol% and a molecular weight of 550,000; the hydrogen content of the hydrogen-containing silicone oil is 0.5 mol%; and the viscosity of the dimethyl silicone oil is 500 mPa / s.
[0041] The preparation method is as follows: 80 parts of methyl vinyl silicone rubber and 20 parts of polyoxymethylene siloxane are placed in a mixer, then 20 parts of silica and 3 parts of hydrogen-containing silicone oil are added and the mixture is stirred for 1 hour until it is uniformly mixed; then 80 parts of hexagonal boron nitride, 550 parts of alumina, 200 parts of zinc oxide and 5 parts of dimethyl silicone oil are added and stirred for 1.5 hours; then the mixture is vacuum kneaded in a kneader for 30 minutes; then the material is discharged, and 0.5 parts of platinum catalyst are added to a two-roll mill and the mixture is sheeted; after sheeting, the mixture is vulcanized in a hot press at 160°C for 20 minutes, then the temperature is raised to 180°C and vulcanized for another 4 hours. After cooling, the product is packaged and ready for shipment.
[0042] The measured properties include a thermal conductivity of 3.0 W / (mk), a hardness of 70A, a tensile strength of 2.6 MPa, and an elongation at break of 94%. Example 3: A self-healing polyborosiloxane. By weight, it comprises the following components: 100 parts of hydroxyl-containing hydrogen silicone oil; 16 parts of tetrahydroxydiboron; POSS-NH 24 copies; 600 parts of chloroform; One part of potassium hydroxide solution; The viscosity of the hydroxyl-containing hydrogen silicone oil is 1500 mPa·s; the molar concentration of the potassium hydroxide solution is 2 mol / L.
[0043] The preparation method is as follows: Tetrahydroxydiboron and hydroxyl-containing hydrogen silicone oil are added to a chloroform solution, and the temperature is raised to 100℃ to allow them to undergo a dehydration condensation reaction for 4 hours. During the reaction, the solvent is refluxed to remove moisture and accelerate the reaction rate. Subsequently, POSS-NH2 is added, and the pH is adjusted to 9 with potassium hydroxide solution. The temperature is controlled at 50℃ for 3.5 hours, followed by washing and filtration to obtain the synthesized self-healing polyborosiloxane.
[0044] A self-healing thermally conductive silicone rubber. By weight, it comprises the following components: 70 parts of methyl vinyl silicone rubber; 30 parts of polyborosiloxane; 30 parts of silica; 100 parts of hexagonal boron nitride; 650 parts of spherical alumina; 200 parts of spherical zinc oxide; 1.5 parts of hydrogen-containing silicone oil; 8 parts of dimethyl silicone oil; 1 part platinum catalyst; The methyl vinyl silicone rubber has a vinyl content of 0.8 mol% and a molecular weight of 600,000; the hydrogen content of the hydrogen-containing silicone oil is 1 mol%; and the viscosity of the dimethyl silicone oil is 500 mPa / s.
[0045] The preparation method is as follows: 70 parts of methyl vinyl silicone rubber and 30 parts of polyoxymethylene siloxane are placed in a mixer, then 30 parts of silica and 2 parts of hydrogen-containing silicone oil are added and the mixture is stirred for 1 hour until it is uniformly mixed; then 100 parts of hexagonal boron nitride, 650 parts of alumina, 200 parts of zinc oxide and 8 parts of dimethyl silicone oil are added and stirred for 1.5 hours; then the mixture is vacuum kneaded in a kneader for 30 minutes; then the material is discharged, and 1 part of platinum catalyst is added to a two-roll mill and the mixture is sheeted; after sheeting, the mixture is vulcanized in a hot press at 160°C for 20 minutes, then the temperature is raised to 180°C and vulcanized for another 4 hours. After cooling, the product is packaged and ready for shipment.
[0046] The measured properties are: thermal conductivity 3.4 W (mk), hardness 76 A, tensile strength 2.0 MPa, and elongation at break 72%.
[0047] Comparative Example 1: Compared to Example 3, the prepared thermally conductive silicone rubber did not contain polyborosiloxane, but the remaining formulation and preparation method were the same as in Example 3. A thermally conductive silicone rubber. By weight, it comprises the following components: 100 parts of methyl vinyl silicone rubber; 30 parts of silica; 100 parts of hexagonal boron nitride; 650 parts of spherical alumina; 200 parts of spherical zinc oxide; 1.5 parts of hydrogen-containing silicone oil; 8 parts of dimethyl silicone oil; 1 part platinum catalyst; The methyl vinyl silicone rubber has a vinyl content of 0.8 mol% and a molecular weight of 600,000; the hydrogen content of the hydrogen-containing silicone oil is 1 mol%; and the viscosity of the dimethyl silicone oil is 500 mPa / s.
[0048] The preparation method is as follows: 100 parts of methyl vinyl silicone rubber are placed in a mixer, and then 30 parts of silica and 2 parts of hydrogen-containing silicone oil are added and mixed for 1 hour until uniform. Then 100 parts of hexagonal boron nitride, 650 parts of alumina, 200 parts of zinc oxide and 8 parts of dimethyl silicone oil are added and mixed for 1.5 hours. Then, the mixture is vacuum kneaded in a kneader for 30 minutes. After that, the material is discharged, and 1 part of platinum catalyst is added to a two-roll mill and sheeted out. After sheeting, the material is vulcanized in a hot press at 160°C for 20 minutes, and then the temperature is raised to 180°C and vulcanized for another 4 hours. After cooling, the product is packaged and shipped.
[0049] The measured thermal conductivity is 3.4 W (mk), the hardness is 84 A, the tensile strength is 1.6 MPa, and the elongation at break is 50%.
[0050] Comparative Example 2 This embodiment discloses a self-healing thermally conductive silicone rubber for connectors and its preparation method, which comprises the following components by weight: 100 parts of hydroxyl silicone oil; 20 parts of phenylboronic acid; 600 parts of chloroform; 2.5 parts potassium hydroxide solution; The viscosity of the hydroxyl silicone oil is 1000 mPa·s; the molar concentration of the potassium hydroxide solution is 2 mol / L.
[0051] The preparation method is as follows: Boric acid and hydroxyl silicone oil are added to a chloroform solution, and the mixture is heated to 100℃ to allow for a dehydration condensation reaction for 4 hours. During the reaction, the solvent is refluxed to remove moisture and accelerate the reaction rate. The resulting product is then washed and filtered to obtain the synthesized self-healing polyborosiloxane. (No end-capping agent added) A self-healing thermally conductive silicone rubber, comprising, by weight, the following components 80 parts of methyl vinyl silicone rubber; 20 parts of polyborosiloxane; 15 parts of silica; 60 parts of hexagonal boron nitride; 450 parts of spherical alumina; 150 parts of spherical zinc oxide; 1.5 parts of hydrogen-containing silicone oil; 5 parts dimethyl silicone oil; 0.5 parts platinum catalyst; The methyl vinyl silicone rubber has a vinyl content of 0.8 mol% and a molecular weight of 450,000; the hydrogen content of the hydrogen-containing silicone oil is 1 mol%; and the viscosity of the dimethyl silicone oil is 500 mPa / s.
[0052] The preparation method is as follows: 80 parts of methyl vinyl silicone rubber and 20 parts of polyoxymethylene siloxane are placed in a mixer, then 15 parts of silica and 1.5 parts of hydrogen-containing silicone oil are added and the mixture is mixed for 1 hour until homogeneous; then 60 parts of hexagonal boron nitride, 450 parts of alumina, 150 parts of zinc oxide and 5 parts of dimethyl silicone oil are added and mixed for 1.5 hours; then the mixture is vacuum kneaded in a kneader for 30 minutes; then the material is discharged, and 0.5 parts of platinum catalyst are added to a two-roll mill and sheeted; after sheeting, the material is vulcanized in a hot press at 160°C for 20 minutes, then the temperature is raised to 180°C and vulcanized for another 4 hours. After cooling, the product is packaged and shipped.
[0053] The only change from Example 1 is that POSS-NH2 was not used for end-capping treatment when synthesizing the self-healing polyborosiloxane.
[0054] The measured properties are: thermal conductivity 2.5 W (mk), hardness 62 A, tensile strength 1.3 MPa, and elongation at break 137%.
[0055] Comparative Example 3 A self-healing polyborosiloxane. By weight, it comprises the following components: 100 parts of hydroxyl-containing hydrogen silicone oil; 16 parts of tetrahydroxydiboron; POSS-NH 24 copies; 600 parts of chloroform; One part of potassium hydroxide solution; The viscosity of the hydroxyl-containing hydrogen silicone oil is 1500 mPa·s; the molar concentration of the potassium hydroxide solution is 2 mol / L.
[0056] The preparation method is as follows: Tetrahydroxydiboron and hydroxyl-containing hydrogen silicone oil are added to a chloroform solution, and the temperature is raised to 100℃ to allow them to undergo a dehydration condensation reaction for 4 hours. During the reaction, the solvent is refluxed to remove moisture and accelerate the reaction rate. Subsequently, POSS-NH2 is added, and the pH is adjusted to 9 with potassium hydroxide solution. The temperature is controlled at 50℃ for 3.5 hours, followed by washing and filtration to obtain the synthesized self-healing polyborosiloxane.
[0057] A self-healing thermally conductive silicone rubber. By weight, it comprises the following components: 50 parts of methyl vinyl silicone rubber; 50 parts of polyborosiloxane; 30 parts of silica; 100 parts of hexagonal boron nitride; 650 parts of spherical alumina; 200 parts of spherical zinc oxide; 1.5 parts of hydrogen-containing silicone oil; 8 parts of dimethyl silicone oil; 1 part platinum catalyst; The methyl vinyl silicone rubber has a vinyl content of 0.8 mol% and a molecular weight of 600,000; the hydrogen content of the hydrogen-containing silicone oil is 1 mol%; and the viscosity of the dimethyl silicone oil is 500 mPa / s.
[0058] The preparation method is as follows: 50 parts of methyl vinyl silicone rubber and 50 parts of polyoxymethylene siloxane are placed in a mixer, then 30 parts of silica and 2 parts of hydrogen-containing silicone oil are added and the mixture is stirred for 1 hour until it is uniformly mixed; then 100 parts of hexagonal boron nitride, 650 parts of alumina, 200 parts of zinc oxide and 8 parts of dimethyl silicone oil are added and stirred for 1.5 hours; then the mixture is vacuum kneaded in a kneader for 30 minutes; then the material is discharged, and 1 part of platinum catalyst is added to a two-roll mill and the mixture is sheeted; after sheeting, the mixture is vulcanized in a hot press at 160°C for 20 minutes, then the temperature is raised to 180°C and vulcanized for another 4 hours. After cooling, the product is packaged and shipped.
[0059] The measured thermal conductivity is 3.5 W (mk), the hardness is 58 A, the tensile strength is 0.57 MPa, and the elongation at break is 83%.
[0060] The only change from Example 3 is that the amount of methyl vinyl silicone rubber added is reduced to 50 parts, and the amount of polyborosiloxane added is increased to 50 parts.
[0061] The performance test results are shown in Table 1: Table 1 shows the performance test results of the thermally conductive silicone rubbers prepared in Examples 1-3 and Comparative Examples 1-3.
[0062] The thermally conductive filler content in Examples 1-3 was gradually increased, and the results showed that the thermal conductivity and hardness of the resulting adhesive increased, while the mechanical properties decreased accordingly.
[0063] Comparative Example 1 and Example 3 had the same formulation, the difference being the absence of polyborosiloxane. The results showed that although the thermal conductivity of the resulting thermally conductive adhesive was the same as in Example 3, its hardness was higher, while its mechanical properties were lower. This indicates that adding an appropriate amount of polyborosiloxane improves the flexibility and mechanical properties of the thermally conductive adhesive.
[0064] Comparative Example 2 and Example 1 had the same formulation, the difference being that POSS-NH2 was not added for end-capping treatment during the synthesis of the polyborosiloxane. The results showed that although the thermal conductivity of the resulting thermally conductive adhesive was the same as that of Example 1, its mechanical properties were lower. This indicates that the end-capped polyborosiloxane exhibited better performance.
[0065] Comparative Example 3 and Example 3 had the same formulation, the difference being the addition of more polyborosiloxane. The results showed that although the thermal conductivity of the resulting thermally conductive adhesive was similar to that of Example 3, its mechanical properties were poor, rendering it unusable. This indicates that excessive addition of polyborosiloxane severely affects the vulcanization crosslinking.
[0066] like Figure 1As shown, the thermally conductive adhesive pieces cut in Example 1, when spliced together, exhibit self-healing properties. After being left at room temperature for 12 hours, the material achieves effective repair, leaving only slight traces on the surface. Heating accelerates the repair process: after maintaining a temperature of 80°C for 5 hours, the surface traces essentially disappear, resulting in a more complete repair.
[0067] The above are the embodiments listed in this example. However, this example is not limited to the optional embodiments described above. Those skilled in the art can arbitrarily combine the above methods to obtain other various embodiments. Anyone can derive other various forms of embodiments based on the inspiration of this example. The above specific embodiments should not be construed as limiting the scope of protection of this example. The scope of protection of this example should be determined by the claims, and the specification can be used to interpret the claims.
Claims
1. A self-healing thermally conductive silicone rubber for connectors, characterized in that: Based on parts by weight, it comprises the following components: 70-100 parts of methyl vinyl silicone rubber, 20-40 parts of polyborosiloxane, 10-30 parts of silica, 450-1250 parts of filler, 5-10 parts of dimethyl silicone oil, 1-3 parts of hydrogen-containing silicone oil, and 0.5-1 part of platinum catalyst.
2. The self-healing thermally conductive silicone rubber for connectors according to claim 1, characterized in that: The methyl vinyl silicone rubber is a vinyl-terminated raw silicone material with a molecular weight of 450,000-600,000 and a vinyl content of 0.08%. And / or, the hydrogen content of the hydrogen-containing silicone oil is 0.5%-1%; And / or, the filler is one or more of hexagonal boron nitride, spherical alumina, or spherical zinc oxide; And / or, the silica is obtained by a gas-phase method.
3. The self-healing thermally conductive silicone rubber for connectors according to claim 2, characterized in that: The filler comprises, by weight, 50-100 parts of hexagonal boron nitride, 300-700 parts of alumina, and 100-450 parts of zinc oxide.
4. The self-healing thermally conductive silicone rubber for connectors according to claim 2, characterized in that: The hexagonal boron nitride has a micron-sized particle size of 5-10 μm. And / or, the spherical alumina has a micron-sized particle size of 10-50 μm; And / or, the spherical zinc oxide has a micron-sized particle size of 5-20 μm.
5. A method for preparing a self-healing thermally conductive silicone rubber for connectors according to any one of claims 1-4, characterized in that: The method for synthesizing the polyborosiloxane includes the following steps: adding boric acid compounds and hydroxyl silicone oil to an organic solvent to carry out a dehydration condensation reaction, then adding a capping agent, adjusting the pH, controlling the temperature and continuing the reaction, and then washing and filtering to obtain the polyborosiloxane.
6. The method for preparing a self-healing thermally conductive silicone rubber for connectors according to claim 5, characterized in that: The dehydration condensation reaction temperature is 100-120℃; And / or, during the dehydration condensation reaction, the solvent is refluxed to remove moisture and accelerate the reaction rate; And / or, the Ph is adjusted by an alkaline solution; And / or, the temperature of the temperature control is controlled between 40-60℃; And / or, the organic solvent is selected from at least one of toluene, chloroform, n-hexane or tetrahydrofuran; And / or, the hydroxyl silicone oil is a hydroxyl-terminated silicone oil.
7. The method for preparing a self-healing thermally conductive silicone rubber for connectors according to claim 6, characterized in that: The Ph value is 8-10.
8. A method for preparing a self-healing thermally conductive silicone rubber for connectors according to claim 5, characterized in that: The hydroxyl silicone oil is one or more of hydroxyl vinyl silicone oil, hydroxyl silicone oil, hydroxyl phenyl silicone oil or hydroxyl hydrogen-containing silicone oil, and has a viscosity of 500~3500 mPa.s.
9. A method for preparing a self-healing thermally conductive silicone rubber for connectors according to claim 5, characterized in that: By weight, the capping agent is added in the amount of 2-8 parts, the hydroxyl silicone oil in the amount of 80-100 parts, the boric acid compound in the amount of 16-20 parts, and the organic solvent in the amount of 500-600 parts.
10. A method for preparing a self-healing thermally conductive silicone rubber for connectors according to claim 5, characterized in that: The capping agent is aminopropyl heptaisobutyl cage-like polysilsesquioxane.