A low-permeability oil single-component heat-conducting gel and a preparation method thereof

Abstract

The application discloses a single-component heat-conducting gel and a preparation method thereof. The heat-conducting gel is prepared from raw materials comprising the following components: 100 parts of single-end vinyl silicone oil, 20-60 parts of side hydrogen-containing silicone oil, 2400-3100 parts of modified heat-conducting powder, inhibitors and platinum catalysts; the viscosity of the single-end vinyl silicone oil is 10-200 mPa.s; the hydrogen content of the side hydrogen-containing silicone oil is 0.05wt%-0.3wt%, and the viscosity is 50-500 mPa.s. The single-component heat-conducting gel is prepared, and the side hydrogen-containing silicone oil and the single-end vinyl silicone oil are used as a pre-curing system of the single-component heat-conducting gel, so that the heat-conducting gel with high extrusion rate and low oil penetration is obtained.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of high polymer materials, in particular to a heat-conducting gel, and especially to a low-oil single-component heat-conducting gel and a preparation method thereof. BACKGROUND

[0002] With the development of the electronic industry, especially the rapid rise of 5G communication and new energy vehicles, heat management materials have ushered in unprecedented opportunities. Electronic components are becoming more and more powerful, and heat management is becoming more and more important, and the requirements for heat management materials are becoming higher and higher. As a new type of thermal interface material, silicone heat-conducting gel has attracted much attention in the industry due to its advantages of both heat-conducting pads and heat-conducting silicone grease.

[0003] Single-component heat-conducting gel can replace heat-conducting silicone grease due to its advantages of convenient construction, easy to apply, and less prone to powdering, and is widely used in communication equipment such as base stations, 3C terminals, and automotive electronic control applications. However, existing single-component heat-conducting gels usually adopt two technical solutions. One is the pre-curing reaction of double-end vinyl silicone oil and double-end hydrogen-containing silicone oil to form a system with long-chain and short-chain polymers coexisting. The other is the pre-curing reaction of double-end vinyl silicone oil and side hydrogen-containing silicone oil to form a system with cross-linked network and short-chain polymers coexisting. Since it is necessary to ensure good extrudability after pre-curing, the cross-linking density of these two technical solutions is designed to be very low (molar ratio of silicon hydride to vinyl group < 1). However, we found that low cross-linking density would inevitably result in some polymers such as vinyl silicone oil not participating in the reaction and remaining in a free state. Some single-component heat-conducting gels on the market are only made by mixing non-reactive methyl silicone oil with powder without any pre-curing reaction, which may cause oil seepage and oil-powder separation over a long period of use, affecting the reliability of heat dissipation.

[0004] Chinese patent application CN118994918A discloses a single-component heat-conducting gel and a preparation method thereof. The single-component heat-conducting gel is prepared by using vinyl silicone oil and side hydrogen-containing silicone oil as the base polymer, and modified boron nitride and liquid metal as the heat-conducting filler, and has excellent heat-conducting performance, high extrudability, and low oil seepage. However, boron nitride is usually difficult to add, and has a high oil absorption value. The low oil seepage of the single-component heat-conducting gel is more derived from the high oil absorption value of the boron nitride powder rather than the base polymer, and the risk of oil seepage still exists over a long period of use.

[0005] Chinese patent application CN119119733A discloses a high-heat-conducting and high-temperature-resistant silicone heat-conducting gel and a preparation method thereof. The silicone heat-conducting gel is prepared by using dimethyl silicone oil, a dispersing agent, modified alumina, and modified zinc oxide as raw materials. The modified alumina and modified zinc oxide after surface treatment can better combine with the dimethyl silicone oil, thereby achieving the effect of reducing the viscosity. The silicone heat-conducting gel also does not powder in a high-temperature environment. However, the polymer system of the silicone heat-conducting gel is non-reactive dimethyl silicone oil, which inevitably has a high risk of oil seepage. SUMMARY

[0006] Based on this, the present application aims at the deficiencies of the prior art, and provides a single-end vinyl silicone oil, a single-component heat-conducting gel composition and a preparation method thereof. The single-component heat-conducting gel has the characteristics of high extrusion rate and low oil penetration by designing a polymer system comprising the single-end vinyl silicone oil.

[0007] The first aspect of the present application provides a single-component heat-conducting gel prepared from raw materials comprising the following components by weight:

[0008] single-end vinyl silicone oil: 100 parts,

[0009] side hydrogen-containing silicone oil: 20-60 parts,

[0010] modified heat-conducting powder: 2400-3100 parts,

[0011] inhibitor: 0.01-0.2 parts,

[0012] platinum catalyst: 2 ppm-10 ppm;

[0013] The single-end vinyl silicone oil is a polydimethylsiloxane having a Si-Vi group at one end of each molecule and a methyl group at the other end, with a viscosity of 10 mPa·s-200 mPa·s, and Vi is a vinyl group.

[0014] The side hydrogen-containing silicone oil is a polydimethylsiloxane having at least 3 Si-H groups in each molecular chain, with a hydrogen content of 0.05wt%-0.3wt% and a viscosity of 50-500 mPa·s.

[0015] The modified heat-conducting powder is obtained by compounding a long-chain alkyl silane and a vinyl silane to modify a common heat-conducting powder.

[0016] In some embodiments, the single-end vinyl silicone oil,

[0017] Preferably, the viscosity of the single-end vinyl silicone oil is 30 mPa·s-200 mPa·s, more preferably 50 mPa·s-100 mPa·s.

[0018] In some embodiments, the side hydrogen-containing silicone oil has a hydrogen content of 0.1wt%-0.2wt%, a viscosity of 100 mPa·s-300 mPa·s, preferably a viscosity of 150 mPa·s-300 mPa·s, and more preferably a viscosity of 150 mPa·s-200 mPa·s.

[0019] In some embodiments, the molar ratio of silicon hydrogen groups in the hydrogen side containing silicone oil to the vinyl groups in the mono-terminal vinyl silicone oil is in the range of 1.5:1 to 3.0:1, preferably 2 to 3.0:1.

[0020] In some embodiments, the hydrogen side containing silicone oil is in the range of 20-50 parts, more preferably 20-30 parts, when the mono-terminal vinyl silicone oil is 100 parts in the one-component heat conductive gel.

[0021] In some embodiments, the modified heat conductive powder is in the range of 2400-2600 parts, when the mono-terminal vinyl silicone oil is 100 parts in the one-component heat conductive gel.

[0022] In some embodiments, the inhibitor is preferably in the range of 0.1-0.2 parts, and / or the platinum catalyst is in the range of 3 ppm-8 ppm, when the mono-terminal vinyl silicone oil is 100 parts in the one-component heat conductive gel.

[0023] In some embodiments, the long chain alkyl silane used for modification in the modified heat conductive powder is trimethoxysilane containing alkyl group of 8-16 carbons; and the heat conductive powder is one or a combination of alumina, zinc oxide, magnesium oxide, aluminum nitride and boron nitride.

[0024] In some embodiments, the method for preparing the modified heat conductive powder comprises: putting 100 parts by weight of heat conductive powder into a stirred tank, spraying 0.1-1.0 parts by weight of long chain alkyl silane into the stirred tank after atomization under stirring, and then heating to 70-90°C for 1-3 hours to obtain the modified heat conductive powder.

[0025] In some preferred embodiments, the parts by weight of the long chain alkyl silane is in the range of 0.1-0.5, more preferably 0.1-0.3, and further more preferably 0.15-0.3.

[0026] In some preferred embodiments, the long chain alkyl silane is trimethoxysilane containing alkyl group of 8-16 carbons, preferably trimethoxysilane containing alkyl group of 10-14 carbons, and most preferably dodecyltrimethoxysilane.

[0027] In some embodiments, the platinum catalyst is one or a combination of chloroplatinic acid, chloroplatinic acid-isopropyl alcohol complex, Karstedt's catalyst.

[0028] In some embodiments, the inhibitor is one or a combination of 1-ethynyl-1-cyclohexanol, tetramethyltetraethenylcyclotetrasiloxane, 2-methyl-3-butynyl-2-ol, 3-methyl-1-hexynyl-3-ol, 3,5-dimethyl-1-hexynyl-3-ol, 3-methyl-1-dodecyn-3-ol.

[0029] The second aspect of the present application is to provide a preparation method of any one of the heat-conducting gels, comprising the following steps:

[0030] (S1) Put the side hydrogen-containing silicone oil, the single-end vinyl silicone oil and the inhibitor into a stirrer, stir and mix uniformly, and then put the modified heat-conducting powder into the stirrer in batches, and stir and mix uniformly after the addition is completed;

[0031] (S2) Put the catalyst into a planetary stirrer, stir and mix uniformly, and remove the bubbles by vacuumizing;

[0032] (S3) Heat the mixture obtained in step (S2) to pre-cure, to obtain the pre-cured one-component heat-conducting gel.

[0033] The present application prepares a one-component heat-conducting gel, which adopts side hydrogen-containing silicone oil and single-end vinyl silicone oil as the pre-curing system of the one-component heat-conducting gel, to obtain a heat-conducting gel with high extrusion rate and low oil penetration.

[0034] Compared with the existing one-component heat-conducting gel, the one-component heat-conducting gel has the following advantages: the specific side hydrogen-containing silicone oil and the single-end vinyl silicone oil are used as the pre-curing reaction matrix, and after pre-curing, a branched structure is formed, in which the side hydrogen-containing silicone oil is the main chain, and the single-end vinyl silicone oil is distributed on both sides of the main chain. The branched structure is similar to a loose fishbone structure, which is completely different from the structure after pre-curing of the traditional one-component heat-conducting gel technical solution. By designing and controlling the viscosity of the side hydrogen-containing silicone oil and the single-end vinyl silicone oil through a suitable silicon hydrogen ratio (molar ratio of silicon hydrogen group to vinyl group), the branched structure not only has high extrusion, but also the single-end vinyl silicone oil fully participates in the reaction, thereby avoiding the free and oil penetration of the vinyl silicone oil to the maximum extent, and the branched structure has the characteristics of high extrusion and low oil penetration. DETAILED DESCRIPTION

[0035] The technical solution of the present application will be further illustrated by specific examples. Those skilled in the art should understand that the examples are only used to help understand the present application, and should not be regarded as a specific limitation on the present application.

[0036] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terms used in the specification of the present application are only for the purpose of describing specific examples and are not intended to limit the present application.

[0037] The terms "comprising" and "having" and any variations thereof used in the present application are intended to cover non-exclusive inclusion. For example, a process, method, device, product or equipment including a series of steps is not limited to the listed steps or modules, but can optionally also include steps not listed, or can optionally also include other steps inherent to these processes, methods, products or equipment.

[0038] The "multiple" mentioned in the present application refers to two or more than two. The "and / or" describes the association between the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the three cases of A alone, A and B together, and B alone. The character " / " generally represents that the associated objects before and after are in an "or" relationship.

[0039] The single-end vinyl silicone oil in the single-component heat-conducting gel has the structure of:

[0040]

[0041] The single-end vinyl silicone oil has one end of each molecule as a Si-Vi group and the other end as a dimethyl polysiloxane with a viscosity of 10 mPa·s to 200 mPa·s.

[0042] The side hydrogen-containing silicone oil in the single-component heat-conducting gel has the structure of:

[0043]

[0044] The side hydrogen-containing silicone oil has a hydrogen content of 0.05wt% to 0.3wt% and a viscosity of 50 mPa·s to 300 mPa·s.

[0045] The following are specific examples.

[0046] The viscosity in the following examples is the viscosity at 25℃ unless otherwise specified; the "parts" refer to weight parts unless otherwise specified.

[0047] The preparation of the heat-conducting gel in the following examples can be carried out according to the following method.

[0048] The preparation method of the single-component heat-conducting gel comprises the following steps:

[0049] (1) According to the specific amount, the single-end vinyl silicone oil, the side hydrogen-containing silicone oil and the inhibitor are put into a planetary mixer, stirred for 5min-6min, mixed uniformly, and the modified heat-conducting powder is put in three batches, and stirred for 30min-35min after the completion of the pouring.

[0050] (2) The catalyst is put into the planetary mixer, stirred and mixed for 20min-25min, and vacuumized to remove bubbles;

[0051] (3) After being divided and packaged, it is heated at about 70℃ (65-75℃) for 3h-3.5h to obtain a pre-cured single-component heat-conducting gel.

[0052] Example 1

[0053] The raw material composition of the one-component heat conductive gel composition described in this example is as follows:

[0054]

[0055] The molar ratio of the silicon hydrogen group in the side hydrogen-containing silicone oil to the vinyl group in the single-end vinyl silicone oil is 2.97.

[0056] The preparation of the modified heat conductive powder includes the following steps:

[0057] Into a stirred tank, 100 parts of heat conductive powder (alumina) is put, and 0.2 parts of long-chain alkyl silane (dodecyltrimethoxysilane) is atomized and sprayed into the stirred tank under stirring, and the temperature is raised to about 80°C and reacted for about 2h to obtain the modified heat conductive powder. In the following examples, the preparation method of the modified heat conductive powder is the same as this.

[0058] The amount of the modified heat conductive powder is 20 times the total amount of the single-end vinyl silicone oil and the side hydrogen-containing silicone oil, and the following examples are the same.

[0059] Example 2

[0060] The raw material composition of the one-component heat conductive gel composition described in this example is as follows:

[0061]

[0062] The molar ratio of the silicon hydrogen group in the side hydrogen-containing silicone oil to the vinyl group in the single-end vinyl silicone oil is 1.82.

[0063] Example 3

[0064] The raw material composition of the one-component heat conductive gel composition described in this example is as follows:

[0065]

[0066] The molar ratio of the silicon hydrogen group in the side hydrogen-containing silicone oil to the vinyl group in the single-end vinyl silicone oil is 2.03.

[0067] Example 4

[0068] The raw material composition of the one-component heat conductive gel composition described in this example is as follows:

[0069]

[0070] The molar ratio of the silicon hydrogen group in the side hydrogen-containing silicone oil to the vinyl group in the single-end vinyl silicone oil is 2.43.

[0071] Example 5

[0072] The raw material composition of the one-component heat conductive gel composition described in this embodiment is as follows:

[0073]

[0074] The molar ratio of the silicon hydrogen group in the side hydrogen-containing silicone oil to the vinyl group in the single-end vinyl silicone oil is 2.03.

[0075] Comparative Example 1

[0076] The one-component heat conductive gel composition described in this comparative example adopts the composition commonly used in existing heat conductive gels, i.e., a simple chain extension method, to form a structure in which long-chain and short-chain polymers coexist after pre-curing. The amount of the heat conductive powder used is 20 times the amount of the oil phase.

[0077] The specific composition of the raw materials is as follows:

[0078]

[0079]

[0080] The molar ratio of the silicon hydrogen group in the side hydrogen-containing silicone oil to the vinyl group in the single-end vinyl silicone oil is 2.03.

[0081] The specific preparation method includes the following steps:

[0082] (1) The end vinyl silicone oil, end hydrogen-containing silicone oil, and inhibitor are put into a planetary mixer, stirred for 5 min to mix uniformly, and the modified heat conductive powder is added in three batches. After the addition is completed, stirring is performed for 30 min until the mixture is uniform;

[0083] (2) The catalyst is put into the planetary mixer, stirred and mixed for 20 min, and vacuum is applied to remove air bubbles;

[0084] (3) After the packaging, heating is performed at 70°C for 3 h to obtain a pre-cured one-component heat conductive gel.

[0085] Comparative Example 2

[0086] The one-component heat conductive gel composition described in this comparative example adopts another commonly used composition of heat conductive gels, and a cross-linked network and short-chain polymer coexist by pre-curing the end vinyl group and the side hydrogen-containing silicone.

[0087] The specific composition of the raw materials is as follows:

[0088]

[0089]

[0090] The molar ratio of the silicon hydrogen group in the side hydrogen-containing silicone oil to the vinyl group in the single-end vinyl silicone oil is 2.03.

[0091] The specific preparation method comprises the following steps:

[0092] (1) Put the end-vinyl silicone oil, side hydrogen-containing silicone oil and inhibitor into a planetary mixer, stir for 5 min to mix uniformly, and then put the modified heat-conducting powder in three batches. After the addition is completed, stir for 30 min to mix uniformly;

[0093] (2) Put the catalyst into the planetary mixer, stir and mix for 20 min, and then remove the gas bubbles by vacuumizing;

[0094] (3) After the packaging, heat at 70℃ for 3 h to obtain a pre-cured one-component heat-conducting gel.

[0095] Comparative Example 3

[0096] The raw material composition of the one-component heat-conducting gel composition of the present comparative example is as follows:

[0097]

[0098]

[0099] The molar ratio of the silicon-hydrogen group in the side hydrogen-containing silicone oil to the vinyl group in the end-vinyl silicone oil is 0.20.

[0100] Comparative Example 4

[0101] The raw material composition of the one-component heat-conducting gel composition of the present example is as follows:

[0102]

[0103] The molar ratio of the silicon-hydrogen group in the side hydrogen-containing silicone oil to the vinyl group in the end-vinyl silicone oil is 1.22.

[0104] Comparative Example 5

[0105] The raw material composition of the one-component heat-conducting gel composition of the present example is as follows:

[0106]

[0107]

[0108] The molar ratio of the silicon-hydrogen group in the side hydrogen-containing silicone oil to the vinyl group in the end-vinyl silicone oil is 4.05.

[0109] Comparative Example 6

[0110] The raw material composition of the one-component heat-conducting gel composition of the present example is as follows:

[0111]

[0112] The molar ratio of silicon hydrogen group in the side hydrogen-containing silicone oil to vinyl group in the terminal vinyl silicone oil is 2.03; the preparation method of the single-component heat-conducting gel comprises the following steps:

[0113] (1) According to specific proportions, the terminal vinyl silicone oil, the side hydrogen-containing silicone oil and the inhibitor are put into a planetary mixer, stirred for 5 min, mixed uniformly, and the modified heat-conducting powder is put in three batches, and stirred for 30 min after the end of the pouring to mix uniformly;

[0114] (2) The catalyst is put into the planetary mixer, stirred and mixed for 20 min, and vacuum is extracted to remove bubbles;

[0115] (3) After being divided and packaged, it is heated at 70°C for 3h to obtain a pre-cured single-component heat-conducting gel.

[0116] The heat-conducting gel compositions of the above examples and comparative examples are respectively tested:

[0117] 1. Thermal conductivity: determined according to "ASTM D 5470-01 Characterization Test for Thermal Conductivity Properties of Thin Heat-Flux Solid Electrical Insulation Materials";

[0118] 2. Extrusion rate determination method: 30cc syringe is filled with the gel, the air pressure is set to 0.6MPa, and the extrusion amount (mass) in 1 min is recorded;

[0119] 3. Oil penetration determination method: 10g of single-component heat-conducting gel is taken, placed on filter paper, and made into a circular gel sample with a diameter of 3cm, and the oil penetration area is calculated after being baked at 120°C for 7 days (oil penetration area = maximum area of oil penetration edge - area of circular gel sample).

[0120] The test results are as follows:

[0121]

[0122]

[0123] From the above table, it can be seen that the thermal conductivities of examples 1-5 all reach about 6.0W / mK, the extrusion rates exceed 30g / min, and the oil penetration areas are all less than 1.5cm 2 Due to the use of the technical scheme of specific terminal vinyl and side hydrogen-containing silicone oil, the silicon hydrogen ratio (molar ratio of silicon hydrogen group to vinyl group) is designed to be between 1.5 and 3.0, and after pre-curing, a branched structure which is neither a long-chain linear nor a three-dimensional network is formed, which can have high extrusion rate and low oil bleeding rate.

[0124] Comparative example 1 relative to examples 1-5 is a pure chain extension system of terminal vinyl silicone oil and terminal hydrogen-containing silicone oil, and the extrusion property is only 21.3g / min, and the oil penetration area is as high as 6.87cm 2, the oil leakage is serious; the curing crosslinking system of Comparative Example 2 and Comparative Example 3 contains double-end vinyl and side hydrogen-containing silicone oil, although the silicon-hydrogen ratio is designed to be much less than 1, but the extrusion is much worse than that of Examples 1-5, and the oil leakage area is more than 4 cm 2 The above is much worse than Examples 1-5; Comparative Example 4 is different from Example 3 in that the silicon-hydrogen ratio is designed to be 1.22, and the branched chain is very dense, although the oil leakage area is smaller, but the extrusion is too low to meet the requirement of high extrusion; Comparative Example 5 is different from Example 3 in that the silicon-hydrogen ratio is designed to be 4.05, and the branched chain is too loose, although the extrusion rate is high, but the oil leakage is relatively poor, reaching 2.17 cm 2 Comparative Example 6 is different from Example 3 in that a single-end vinyl silicone oil with a viscosity of 300 mPa.s is used, although the silicon-hydrogen ratio is designed to be consistent, but due to the too large molecular weight, the branched chain is too long, and the extrusion rate is only 7.69 g / min, which cannot meet the requirements of high extrusion and low oil leakage.

[0125] The technical features of the above-described examples can be combined arbitrarily, in order to make the description simple, all possible combinations of the technical features in the above-described examples are not described, however, as long as the combination of the technical features does not exist contradictory, it should be considered as the scope of the present application.

[0126] The above-described examples only express several embodiments of the present application, the description is more specific and detailed, but it should not be understood as a limitation on the scope of the patent. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of variations and improvements can be made, which are within the scope of the present application. Therefore, the scope of protection of the present application should be subject to the appended claims.

Claims

1. A one-component thermally conductive gel, characterized in that, It is prepared from raw materials comprising the following components, by weight: Single-ended vinyl silicone oil: 100 parts Side-containing hydrogen silicone oil: 20-60 parts, Modified thermally conductive powder: 2400-3100 parts, Inhibitor: 0.01-0.2 parts, Platinum catalyst: 2ppm-10ppm; The structure of the single-ended vinyl silicone oil is as follows: Its viscosity ranges from 10 mPa·s to 200 mPa·s; The structure of the side-containing hydrogen silicone oil is as follows: Its hydrogen content is 0.05wt% to 0.3wt%, and its viscosity is 50 to 500 mPa·s; The modified thermally conductive powder is prepared by modifying ordinary thermally conductive powder with long-chain alkylsilane; the molar ratio of silane groups in the side-containing hydrogen silicone oil to vinyl groups in the single-end vinyl silicone oil is 1.5:1 to 3.0:

1.

2. The single-component thermally conductive gel according to claim 1, characterized in that, The viscosity of the single-ended vinyl silicone oil is 30 mPa·s to 200 mPa·s.

3. The single-component thermally conductive gel according to claim 2, characterized in that, The viscosity of the single-ended vinyl silicone oil is 50 mPa·s to 100 mPa·s.

4. The single-component thermally conductive gel according to claim 1, characterized in that, The hydrogen content of the side-containing silicone oil is 0.1wt% to 0.2wt%, and the viscosity is 50mPa·s to 300mPa·s.

5. The single-component thermally conductive gel according to claim 4, characterized in that, The viscosity of the hydrogen-containing silicone oil is 150 mPa·s to 300 mPa·s.

6. The single-component thermally conductive gel according to any one of claims 1-5, characterized in that, The molar ratio of silanol groups in the side-containing hydrogen silicone oil to vinyl groups in the single-ended vinyl silicone oil is 2:1 to 3.0:

1.

7. The single-component thermally conductive gel according to any one of claims 1-5, characterized in that, The long-chain alkylsilane used for modification in the modified thermally conductive powder is a trimethoxysilane containing 8-16 carbon alkyl groups; and / or The thermally conductive powder is one or a combination of aluminum oxide, zinc oxide, magnesium oxide, aluminum nitride, and boron nitride.

8. The single-component thermally conductive gel according to claim 7, characterized in that, The method for preparing the modified thermally conductive powder includes: adding 100 parts by weight of thermally conductive powder into a stirred tank, and spraying 0.1-1.0 parts by weight of long-chain alkylsilane into the stirred tank while stirring, and heating to 70℃-90℃ for 1h-3h to obtain the modified thermally conductive powder.

9. The single-component thermally conductive gel according to claim 7, characterized in that, The long-chain alkylsilane has a weight ratio of 0.1-0.5; and / or The long-chain alkylsilane is a trimethoxysilane containing 10-14 carbon alkyl groups.

10. The single-component thermally conductive gel according to claim 9, characterized in that, The long-chain alkylsilane has a weight ratio of 0.1-0.

3.

11. The single-component thermally conductive gel according to claim 10, characterized in that, The long-chain alkylsilane has a weight ratio of 0.15-0.3%.

12. The single-component thermally conductive gel according to claim 9, characterized in that, The long-chain alkylsilane is dodecyltrimethoxysilane.

13. The single-component thermally conductive gel according to any one of claims 1-5, characterized in that, When the single-component thermally conductive gel contains 100 parts of single-ended vinyl silicone oil, the side-containing hydrogen silicone oil contains 20-50 parts; and / or Modified thermally conductive powder: 2400-2600 parts; and / or The inhibitor was administered at a dose of 0.1-0.2 parts; and / or The platinum catalyst concentration is 3 ppm to 8 ppm.

14. The single-component thermally conductive gel according to claim 13, characterized in that, The amount of hydrogen-containing silicone oil is 20-30 parts.

15. The single-component thermally conductive gel according to any one of claims 1-5, characterized in that, The platinum catalyst is one or a combination of chloroplatinic acid, chloroplatinic acid-isopropanol complex, and caster catalyst; and / or the inhibitor is one or a combination of 1-ethynyl-1-cyclohexanol, tetramethyltetravinylcyclotetrasiloxane, 2-methyl-3-butynyl-2-ol, 3-methyl-1-hexynyl-3-ol, 3,5-dimethyl-1-hexynyl-3-ol, and 3-methyl-1-dodecynyl-3-ol.

16. A method for preparing the single-component thermally conductive gel according to any one of claims 1-15, characterized in that, The preparation method includes the following steps: (S1) The side-containing hydrogen silicone oil, the single-end vinyl silicone oil and the inhibitor are put into a mixer and stirred and mixed evenly. Then the modified thermally conductive powder is added in batches and stirred and mixed evenly after the addition is completed. (S2) The catalyst is added to a mixer, stirred and mixed evenly, and vacuumed to remove bubbles to obtain a mixture; (S3) The mixture obtained in step (S2) is heated and pre-cured to obtain a pre-cured single-component thermally conductive gel.

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