Heat dissipation coating with long service life

Abstract

The invention provides a heat dissipation coating with long service life, and relates to the technical field of heat dissipation coatings. The heat dissipation coating with the long service life is specifically prepared by the following steps: S1, preparation of mesoporous silica powder, S2, preparation of antibacterial freeze-dried powder, S3, preparation of a coating stock solution, and S4, preparation of the antibacterial heat dissipation coating. A silver ion and vegetable oil composite bacteriostatic agent is ingeniously introduced to the surface of mesoporous silica. In the process, the mesoporous silica serves as an efficient carrier, not only stably bears the silver ion and vegetable oil composite bacteriostatic agent, but also is further introduced into the heat dissipation coating, and the original antibacterial ability of the heat dissipation coating is remarkably improved by means of the excellent characteristic, namely the extremely high specific surface area, of the mesoporous silica. Through the innovative design, the heat dissipation performance of the coating is enhanced, the coating is endowed with a more excellent antibacterial function, and a more reliable and efficient solution is provided for application in related fields.

Description

Technical Field

[0001] The invention relates to the technical field of heat dissipation coatings, in particular to a heat dissipation coating with a long service life. Background Art

[0002] With the development of modern industry and electronic technology, the demand for heat dissipation coatings is growing. Such coatings are widely used in electronic equipment, electrical insulation, building materials and other fields. Given the continuous operation of electronic equipment, the surface of its radiator is very likely to become a breeding ground for bacteria and microorganisms. These microorganisms pose a threat to the coating materials on the surface of the radiator, which can easily cause the coating to degrade and peel off, not only damaging its aesthetics, but also likely to corrode the electronic equipment and hinder effective heat dissipation. Therefore, the requirements for coatings have been raised to a new level, that is, they must have excellent heat dissipation and decorative functions, while showing excellent antibacterial and anti-corrosion properties.

[0003] At present, the common heat dissipation coatings on the market can meet the basic requirements in terms of heat dissipation performance. However, given that some electronic equipment heat dissipation devices have long faced challenges such as poor ventilation and difficult cleaning and maintenance, the coating surface has easily become a breeding ground for microorganisms and bacteria. Microbial erosion can seriously damage the coating structure, which is manifested in frequent coating shedding and cracking, which significantly weakens the thermal conductivity and heat dissipation performance of the coating, and ultimately has an adverse effect on the service life of the equipment. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides a heat dissipation coating with a long service life. On the basis of conventional heat dissipation coating, mesoporous silica material is cleverly introduced, and the antibacterial ability of the coating is significantly enhanced by combining silver ions as well as tea tree oil and peppermint oil. This improvement not only effectively inhibits the growth of microorganisms, but also significantly extends the service life of the heat dissipation coating, providing a more solid guarantee for the efficient and stable operation of electronic equipment.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a heat dissipation coating with a long service life, specifically comprising the following preparation steps:

[0006] S1. Preparation of mesoporous silica powder

[0007] 100 g of powder was prepared by a mesoporous silica powder preparation method;

[0008] S2. Preparation of antibacterial freeze-dried powder

[0009] Silver ions and vegetable oil antibacterial agents are loaded onto the surface of mesoporous silica, and the mesoporous silica is made into a 5-20% concentration silica aqueous dispersion using a PVP dispersant. After the aqueous dispersion is prepared, 3-10 parts by weight of tea tree oil and 7-20 parts of peppermint oil are first dissolved in 10-30 parts by weight of anhydrous ethanol, and then added to the mesoporous silica aqueous solution, and then 5-20 parts by weight of a 1 g / L silver nitrate aqueous solution is added, stirred for 15 minutes, and then the solution is prepared into an antibacterial freeze-dried powder by a vacuum freeze dryer;

[0010] S3. Preparation of coating stock solution

[0011] Weigh the raw materials for preparing the heat dissipation coating according to the weight ratio, stir and mix the weighed raw materials for preparing the heat dissipation coating to prepare a coating stock solution for standby use;

[0012] S4. Preparation of antibacterial heat dissipation coating

[0013] 0.6 parts by weight of the freeze-dried powder of the antibacterial agent prepared in step S2 was slowly added to the coating stock solution in step S3, and stirred at a low speed of 300 rpm for 20 minutes to prepare an antibacterial heat dissipation coating.

[0014] Preferably, in S1, the preparation of mesoporous silica powder specifically comprises the following steps:

[0015] S101. Selecting a suitable mesoporous structure template;

[0016] S102. Immersing the mesoporous template into a silicon source solution;

[0017] S103. After the mesoporous template is adsorbed, it is taken out and dried, so that the silicon source forms a gel-like structure on the surface of the mesoporous template;

[0018] S104. Calcine the prepared mesoporous template with a gel-like structure in a high temperature environment, remove the template, and prepare a mesoporous silica material.

[0019] Preferably, in S101, the mesoporous structure template can be selected from one of porous anodized aluminum, organic polymer membrane, polystyrene spheres, molecular sieves and carbon nanotubes.

[0020] Preferably, in S103, drying can be performed by air drying or drying in a dryer.

[0021] Preferably, in S2, the plant oil antibacterial agent is made of tea tree oil and peppermint oil.

[0022] Preferably, in S3, the raw material ratio of the heat dissipation coating is epoxy resin: 21-28 parts by weight, silicone resin: 15-20 parts by weight, aluminum oxide: 1.5-2.5 parts by weight, boron nitride: 0.75-1.25 parts by weight, silicon carbide: 0.45-0.75 parts by weight, leveling agent: 0.075-0.15 parts by weight, defoaming agent: 0.075-0.15 parts by weight, anti-settling agent: 0.075-0.15 parts by weight, curing agent: 0.1-0.2 parts by weight, thermal conductive filler: 0.2-0.4 parts by weight, insulating filler: 0.15-0.3 parts by weight.

[0023] The present invention provides a heat dissipation coating with a long service life. It has the following beneficial effects:

[0024] 1. The present invention provides a heat dissipation coating with a long service life, which cleverly introduces silver ions and vegetable oil composite antibacterial agents into the surface of mesoporous silica. In this process, mesoporous silica, as an efficient carrier, not only stably carries silver ions and vegetable oil composite antibacterial agents, but is also further introduced into the heat dissipation coating. Mesoporous silica, with its excellent characteristics - extremely high specific surface area, significantly improves the original antibacterial ability of the heat dissipation coating. This innovative design not only enhances the heat dissipation performance of the coating, but also gives it a more excellent antibacterial function, providing a more reliable and efficient solution for applications in related fields.

[0025] 2. The present invention provides a heat dissipation coating with a long service life. By adding silver ions, the silver ions can produce an oxidative stress reaction under light irradiation, generating active oxygen species such as hydroxyl free radicals. These active oxygen species can react with proteins, fats, sugars and other substances in bacteria to cause bacterial death. This oxidative stress effect can effectively kill a variety of bacteria and viruses and enhance the antibacterial function.

[0026] 3. The present invention provides a heat dissipation coating with a long service life. By adding tea tree oil and peppermint oil, the benzyl alcohol, eucalyptus oil and other ingredients contained in the two have antibacterial effects and can effectively inhibit the growth and reproduction of bacteria. The antibacterial effect is exerted by interfering with the synthesis of bacterial cell walls or destroying their structural integrity. After the silver ions and tea tree oil and peppermint oil work together, the antibacterial and sterilization channels of the coating are further enhanced.

[0027] 4. The present invention provides a heat dissipation coating with a long service life. By using mesoporous silica material, which has a large specific surface area and specific pore volume, silver ions and vegetable oil molecules can be loaded in the pores of the material, and then the bactericidal function of silver ions and vegetable oil is controlled and released by modifying the functional groups, thereby improving the durability of the bactericidal function. By utilizing the biological guidance effect, bacterial microbial cells can be effectively and accurately hit, thereby achieving the effect of sterilization and control of bacteria.

[0028] 5. The present invention provides a heat dissipation coating with a long service life. Through comparative experiments, the heat dissipation coating with antibacterial agent added and the ordinary heat dissipation coating are respectively coated on the bottom of a round glass culture dish in a sterile operating table, dried at 80°C for 30 minutes, and maintained at room temperature for 48 hours. The two coated culture dishes are placed in the moldy clothes in the open air for 15 days. After 15 days, the number of bacteria is observed using a fluorescence microscope. By comparison, it is found that the number of bacteria in the coating with antibacterial agent added is reduced by at least 50% relative to the ordinary heat dissipation coating. Then the two coatings are placed in an aging test box under a high temperature and high humidity environment for accelerated aging experiments. By comparison, it is found that the antibacterial heat dissipation coating begins to fall off on the 15th day, while the ordinary heat dissipation coating begins to fall off on the 7th day. From this data, it can be seen that the antibacterial ability of the coating with antibacterial agent added is increased by 50%, and the service life of the coating is also increased by 50%. After the coating is aged by microbial erosion, the heat dissipation effect of the coating is tested separately. It is found that the heat dissipation effect of the heat dissipation coating with antibacterial agent added is reduced by about 5%, while the heat dissipation effect of the heat dissipation coating without antibacterial agent added is reduced by about 15%. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a schematic diagram of the test results of Test 1 of the present invention;

[0030] Figure 2 It is a test structure schematic diagram of Test 2 of the present invention;

[0031] Figure 3 This is a schematic diagram of the heat dissipation and cooling trend of Test 2 of the present invention;

[0032] Figure 4 It is a comparative schematic diagram of the coating of the present invention after being infected by bacteria. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] Example 1

[0035] An embodiment of the present invention provides a heat dissipation coating with a long service life, which specifically includes the following preparation steps:

[0036] S1: Prepare 100 g of mesoporous silica powder by the mesoporous silica powder preparation method.

[0037] S2: Weigh 5 parts by weight of PVP powder and dissolve it in 90 parts by weight of deionized water. Add 5 parts by weight of mesoporous silica powder while stirring, and stir for 30 minutes to obtain a mesoporous silica dispersion.

[0038] S3: Weigh 3 parts by weight of tea tree oil and 7 parts by weight of peppermint oil, and dissolve them in 10 parts by weight of anhydrous ethanol to obtain a mixed solution.

[0039] S4: S2 and S3 were finely mixed using a high-speed disperser, and 5 parts by weight of a 1 g / L silver nitrate aqueous solution was added dropwise while stirring. After the addition was completed, a vacuum freeze dryer was used to prepare a freeze-dried powder of the antibacterial agent.

[0040] S5: Weigh 30 parts by weight of the basic heat dissipation coating A, add the freeze-dried powder of the antibacterial agent obtained in step S4, and disperse at a low speed for 20 minutes to obtain the antibacterial heat dissipation coating.

[0041] S6: Apply the antibacterial and heat dissipation coating obtained in S5 to the bottom of the round glass culture dish, dry at 50° C. for 30 min, and maintain at room temperature for 48 h for later use.

[0042] Example 2

[0043] An embodiment of the present invention provides a heat dissipation coating with a long service life, which specifically includes the following preparation steps:

[0044] S1. Prepare 100 grams of mesoporous silica powder by the mesoporous silica powder preparation method.

[0045] S2. Weigh 5 parts by weight of PVP powder and dissolve it in 90 parts by weight of deionized water. Add 10 parts by weight of mesoporous silica powder while stirring, and stir for 30 minutes to obtain a mesoporous silica dispersion.

[0046] S3. Weigh 5 parts by weight of tea tree oil and 20 parts by weight of peppermint oil, dissolve them in 20 parts by weight of anhydrous ethanol to obtain a mixed solution.

[0047] S4. Finely mix S2 and S3 using a high-speed disperser, and dropwise add 10 parts by weight of a 1 g / L silver nitrate aqueous solution while stirring. After the dropwise addition is completed, a vacuum freeze dryer is used to prepare a freeze-dried powder of the antibacterial agent.

[0048] S5. Weigh 30 parts by weight of the basic heat dissipation coating A, add the freeze-dried powder of the antibacterial agent obtained in step S4, and disperse at a low speed for 20 minutes to obtain the antibacterial heat dissipation coating.

[0049] S6. Apply the antibacterial and heat-dissipating coating obtained in S5 to the bottom of the round glass culture dish, dry at 50°C for 30 min, and maintain at room temperature for 48 h for later use.

[0050] Example 3

[0051] An embodiment of the present invention provides a heat dissipation coating with a long service life, which specifically includes the following preparation steps:

[0052] S1. Prepare 100 grams of mesoporous silica powder by the mesoporous silica powder preparation method.

[0053] S2. Weigh 15 parts by weight of PVP powder and dissolve it in 40 parts by weight of deionized water. Add 15 parts by weight of mesoporous silica powder while stirring, and stir for 30 minutes to obtain a mesoporous silica dispersion.

[0054] S3. Weigh 10 parts by weight of tea tree oil and 30 parts by weight of peppermint oil, dissolve them in 30 parts by weight of anhydrous ethanol to obtain a mixed solution.

[0055] S4. Finely mix S2 and S3 using a high-speed disperser, and dropwise add 20 parts by weight of a 1 g / L silver nitrate aqueous solution while stirring. After the dropwise addition is completed, a vacuum freeze dryer is used to prepare a freeze-dried powder of the antibacterial agent.

[0056] S5. Weigh 30 parts by weight of the basic heat dissipation coating A, add the freeze-dried powder of the antibacterial agent obtained in step S4, and disperse at a low speed for 20 minutes to obtain the antibacterial heat dissipation coating.

[0057] S6. Apply the antibacterial and heat-dissipating coating obtained in S5 to the bottom of the round glass culture dish, dry at 50°C for 30 min, and maintain at room temperature for 48 h for later use.

[0058] Comparative Example 1

[0059] S1. Prepare 100 g of mesoporous silica powder by consulting the literature.

[0060] S2. Weigh 5 parts by weight of PVP powder and dissolve it in 90 parts by weight of deionized water. Add 5 parts by weight of mesoporous silica powder while stirring, and stir for 30 minutes to obtain a mesoporous silica dispersion.

[0061] S3. Weigh 30 parts by weight of basic heat dissipation coating A, add 20 parts by weight of mesoporous silica powder obtained in step S2, and disperse at high speed for 20 minutes to obtain heat dissipation coating. The preparation of basic heat dissipation coating A includes weighing 28 parts by weight of epoxy resin, 20 parts by weight of silicone resin, 2.5 parts by weight of aluminum oxide, 1.25 parts by weight of boron nitride, 0.75 parts by weight of silicon carbide, 0.15 parts by weight of leveling agent, 0.15 parts by weight of defoaming agent, 0.15 parts by weight of anti-settling agent, 0.4 parts by weight of thermal conductive filler, and 0.3 parts by weight of insulating filler.

[0062] S4. Apply the antibacterial and heat-dissipating coating obtained in S3 to the bottom of the round glass culture dish, dry at 50°C for 30 min, and maintain at room temperature for 48 h for later use.

[0063] Comparative Example 2

[0064] S1. Weigh 3 parts by weight of tea tree oil and 7 parts by weight of peppermint oil, and dissolve them in 10 parts by weight of anhydrous ethanol to obtain a mixed solution.

[0065] S2. Weigh 30 parts by weight of basic heat dissipation coating A, add 10 parts by weight of the antibacterial agent liquid obtained in step S1, and disperse at a low speed for 20 minutes to obtain the antibacterial heat dissipation coating. The preparation of the basic heat dissipation coating A includes weighing 28 parts by weight of epoxy resin, 20 parts by weight of silicone resin, 2.5 parts by weight of aluminum oxide, 1.25 parts by weight of boron nitride, 0.75 parts by weight of silicon carbide, 0.15 parts by weight of leveling agent, 0.15 parts by weight of defoaming agent, 0.15 parts by weight of anti-settling agent, 0.4 parts by weight of thermal conductive filler, and 0.3 parts by weight of insulating filler.

[0066] S3. Apply the antibacterial and heat-dissipating coating obtained in S2 to the bottom of a round glass culture dish, dry at 50°C for 30 min, and maintain at room temperature for 48 h for later use.

[0067] The advantages of antibacterial heat dissipation coatings are illustrated by testing the heat dissipation coating culture dish samples made in Examples 1, 2, 3 and Comparative Examples 1 and 2. In Test 1, after the culture dish coated sample is cured for 48 hours, the sample is placed in moldy clothes for 7 days. After being placed in an accelerated aging test box (note: turn off the UV light after placing in the aging box) for 100 hours, the adhesion, hardness and shedding of the paint film are tested. The test results are shown in the attached figure. Figure 1 As shown in the figure, the paint film was wrapped with moldy clothing to allow bacterial microorganisms to fully contact the paint film. After testing, it was found that the coating with mesoporous silica and vegetable oil added at the same time performed well in terms of paint film adhesion and shedding.

[0068] Test 2: The heat dissipation of each sample board processed in Test 1 was tested. The test results are shown in the attached Figure 2 and 3 As shown in , after testing and analysis, the cooling conditions of the coatings of Examples 1, 2, and 3 to which mesoporous silica, silver ions, and vegetable oil are added are better than the heat dissipation conditions of Comparative Examples 1 and 2. In Comparative Example 1, only mesoporous silica powder is added, and in Comparative Example 2, only silver ions and vegetable oil are added. By comparison, the heat dissipation of the coating to which only silica is added is worse than that of the coating to which only silver ions and vegetable oil are added. This shows that the addition of silica powder alone does not have an antibacterial effect on the heat dissipation coating. The heat dissipation of the heat dissipation coating to which only silver ions and vegetable oil are added is worse than that of the coating to which both silica and silver ion vegetable oil are added. This also shows that the antibacterial and antibacterial effect of the heat dissipation coating can be improved under the synergistic effect of the porous structure of mesoporous silica and silver ion vegetable oil.

[0069] After comparative testing, the feasibility of this technological invention was verified.

[0070] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A heat dissipation coating with a long service life, characterized in that: The specific preparation steps include: S1. Preparation of mesoporous silica powder 100 g of powder was prepared by a mesoporous silica powder preparation method; S2. Preparation of antibacterial freeze-dried powder Silver ions and vegetable oil antibacterial agents are loaded onto the surface of mesoporous silica, and the mesoporous silica is made into a 5-20% concentration silica aqueous dispersion using a PVP dispersant. After the aqueous dispersion is prepared, 3-10 parts by weight of tea tree oil and 7-20 parts of peppermint oil are first dissolved in 10-30 parts by weight of anhydrous ethanol, and then added to the mesoporous silica aqueous solution, and then 5-20 parts by weight of a 1 g / L silver nitrate aqueous solution is added, stirred for 15 minutes, and then the solution is prepared into an antibacterial freeze-dried powder by a vacuum freeze dryer; S3. Preparation of coating stock solution Weigh the raw materials for preparing the heat dissipation coating according to the weight ratio, stir and mix the weighed raw materials for preparing the heat dissipation coating to prepare a coating stock solution for standby use; S4. Preparation of antibacterial heat dissipation coating 0.6 parts by weight of the freeze-dried powder of the antibacterial agent prepared in step S2 was slowly added to the coating stock solution in step S3, and stirred at a low speed of 300 rpm for 20 minutes to prepare an antibacterial heat dissipation coating.

2. The heat dissipation coating with a long service life according to claim 1, characterized in that: In S1, the preparation of mesoporous silica powder specifically includes the following steps: S101. Selecting a suitable mesoporous structure template; S102. Immersing the mesoporous template into a silicon source solution; S103. After the mesoporous template is adsorbed, it is taken out and dried, so that the silicon source forms a gel-like structure on the surface of the mesoporous template; S104. Calcine the prepared mesoporous template with a gel-like structure in a high temperature environment, remove the template, and prepare a mesoporous silica material.

3. The heat dissipation coating with a long service life according to claim 2, characterized in that: In S101, the mesoporous structure template can be selected from one of porous anodized aluminum, organic polymer membrane, polystyrene sphere, molecular sieve and carbon nanotube.

4. The heat dissipation coating with a long service life according to claim 1, characterized in that: In S103, drying can be performed by air drying or drying with a dryer.

5. The heat dissipation coating with a long service life according to claim 1, characterized in that: In S2, the plant oil antibacterial agent is made of tea tree oil and peppermint oil.

6. The heat dissipation coating with a long service life according to claim 1, characterized in that: In S3, the raw material ratio of the heat dissipation coating is: epoxy resin: 21-28 parts by weight, silicone resin: 15-20 parts by weight, aluminum oxide: 1.5-2.5 parts by weight, boron nitride: 0.75-1.25 parts by weight, silicon carbide: 0.45-0.75 parts by weight, leveling agent: 0.075-0.15 parts by weight, defoaming agent: 0.075-0.15 parts by weight, anti-settling agent: 0.075-0.15 parts by weight, curing agent: 0.1-0.2 parts by weight, thermal conductive filler: 0.2-0.4 parts by weight, insulating filler: 0.15-0.3 parts by weight.

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