CN115368791B - Low-surface-energy bionic hydrophobic self-cleaning coating and preparation method thereof - Google Patents
Low-surface-energy bionic hydrophobic self-cleaning coating and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a low-surface-energy bionic hydrophobic self-cleaning coating, which comprises a primer and a finish paint, wherein the primer comprises the following raw materials in parts by weight: deionized water: 17-19, bentonite: 1.5-2, dispersant: 0.5-1, defoamer: 0.5-1, fluorosilicone emulsion: 20-25, silane modified aqueous acrylic emulsion: 30-35, 400 mesh wollastonite powder: 8-10, 200 mesh talcum powder: 6-8, sand flour: 7-10, self-repairing microcapsule: 6-8; the finishing paint comprises a component A and a component B, wherein the component A consists of the following raw materials in parts by weight: inorganic silicon resin: 90-95, hydrophobic gas phase white carbon black: 2-3, molecular sieves: 3-6, water conversion agent: 0.1-0.3, wherein the component B consists of the following raw materials in parts by weight: ethanol: 7-10, catalyst: 1.5-2.1. The coating film has bionic hydrophobic self-cleaning performance, has a self-repairing function when scratched, and has excellent chemical corrosion resistance, adhesive force and weather resistance.
Description
Technical Field
The invention belongs to the technical field of coatings, and particularly relates to a low-surface-energy bionic hydrophobic self-cleaning coating, and a preparation method of the coating.
Background
The self-cleaning paint can prevent water drops from adhering to the surface of glass, ceramic, metal or plastic and other base materials by changing the surface properties of the base materials, thereby achieving the self-cleaning effect. The hydrophobic self-cleaning coating has a plurality of applications in the aspects of glass curtain walls, solar heat collection devices and the like by virtue of excellent anti-fog and anti-fouling properties. The super-hydrophobic phenomenon in nature is known for a long time, and the most representative is the hydrophobic phenomenon of lotus leaves. The lotus leaf surface has a rough micro-nano structure, and the specific micro-nano structure and the wax on the surface are important reasons for realizing the self-cleaning property. The bionic hydrophobic surface is established, so that dirt is taken away when water drops roll off, the cleaning cost can be greatly reduced, and the energy utilization rate is improved. However, under the conditions of physical abrasion and chemical corrosion, the ordinary hydrophobic material easily loses the hydrophobic property, thereby affecting the normal use thereof.
Disclosure of Invention
In order to improve the durable usability of the hydrophobic material, the invention provides the low-surface-energy bionic hydrophobic self-cleaning coating, which has the bionic hydrophobic self-cleaning performance, has a self-repairing function when scratched, and has excellent chemical corrosion resistance, adhesive force and weather resistance.
In order to achieve the aim of the invention, the invention adopts the following technical scheme:
the low-surface-energy bionic hydrophobic self-cleaning coating comprises a primer and a finish paint, wherein the primer consists of the following raw materials in parts by weight: deionized water: 17-19, bentonite: 1.5-2, dispersant: 0.5-1, defoamer: 0.5-1, fluorosilicone emulsion: 20-25, silane modified aqueous acrylic emulsion: 30-35, 400 mesh wollastonite powder: 8-10, 200 mesh talcum powder: 6-8, sand flour: 7-10, self-repairing microcapsule: 6-8; the finishing paint comprises a component A and a component B, wherein the component A consists of the following raw materials in parts by weight: inorganic silicon resin: 90-95, hydrophobic gas phase white carbon black: 2-3, molecular sieves: 3-6, water conversion agent: 0.1-0.3, wherein the component B consists of the following raw materials in parts by weight: ethanol: 7-10, catalyst: 1.5-2.1.
The primer film forming material adopts the fluorosilicone emulsion and the silane modified water-based acrylic emulsion, on one hand, the surface tension of the fluorosilicone emulsion and the silane modified water-based acrylic emulsion is low, excellent hydrophobic performance of a coating film is provided, when a paint film finish is scratched, the primer can still provide long-term hydrophobic self-cleaning performance of the coating film, on the other hand, siloxane contained in the silane modified water-based acrylic emulsion is hydrolyzed to form silicon hydroxyl groups, excellent adhesive force between the coating film and a base material is provided, and the silicon hydroxyl groups in the primer are crosslinked and cured to provide excellent chemical resistance of the coating film, and the silicon hydroxyl groups in the primer and the silicon hydroxyl groups in inorganic silicon resin in the finish are dehydrated, crosslinked and cured, so that interlayer adhesive force between the primer and the finish is improved. According to the primer formula, 400-mesh wollastonite powder, 200-mesh talcum powder, sand flour and self-repairing microcapsule are added, and the hydrophobic fumed silica is added into the finish paint, so that the micro-nano filler can form a concave-convex surface on the surface of a coating film, and the contact area between water drops and the surface of the coating film is reduced. In addition, the surface tension of the finish inorganic silicon resin is low, inorganic components contained in the resin can provide a nano coarse structure, and the nano coarse structure and the primer are matched in a synergistic way to provide excellent bionic self-cleaning performance of the coating. The molecular sieve and the water conversion agent in the finishing paint can improve the storage stability of the A component of the finishing paint.
Further, the water conversion agent is an imine latent curing agent, the molecular sieve is a 4A molecular sieve, the hydrophobic fumed silica is R972 of Desoxhlet, and the average grain diameter of the sand flour is 85 mu m.
Preferably, the water conversion agent is an imine latent curing agent, the molecular sieve is a 4A molecular sieve, and the hydrophobic fumed silica is R972 of Desoxase. The imine latent curing agent is preferably ALT-401 of Ailite. The addition of the imine latent curing agent can react with a small amount of water entrained in the system or water in the air to generate hydroxyl groups, so that on one hand, the gel of the system caused by moisture curing is prevented, on the other hand, the generated hydroxyl groups can react with silicon hydroxyl groups in the inorganic silicon resin to improve the crosslinking density of the system and the chemical resistance of a coating film, in addition, silica sol in the inorganic silicon resin provides nano silica particles, a coarse micro-nano structure is formed together with the primer, the hydrophobic self-cleaning performance of the coating film is improved, and the molecular sieve can effectively adsorb the water in the system, so that the storage stability of the system is improved. In addition, the hydrophobic fumed silica R972 provides the proper rheology and viscosity for the system in solvents containing alcohols.
Further, the fluorosilicone emulsion is prepared by the following method:
adding 0.4g of isomeric tridecanol polyoxyethylene ether, 0.2g of fatty alcohol polyoxyethylene ether, 1g of dodecylbenzene sulfonic acid, 60g of water, 54g of octamethyl cyclotetrasiloxane, 6g of trifluoropropyl-methyl cyclotrisiloxane and 1.2g of hexamethyldisiloxane into a reactor a, and stirring for 15 minutes in 1000r/min to obtain a pre-emulsion for later use; adding 1g of dodecylbenzene sulfonic acid and 80g of deionized water into a reactor b, uniformly stirring, and heating to 85-88 ℃; and (3) dropwise adding the pre-emulsified liquid in the reactor a into the reactor b for 1 hour, keeping the temperature of 85-88 ℃ for reacting for 5 hours, cooling to below 30 ℃, and adding 0.8g of ammonia water for neutralization to obtain the fluorosilicone emulsion.
Further, the silane modified aqueous acrylic emulsion is KRN8101 of New type materials Co., ltd. Jin Run in Heshan.
The self-made fluorosilicone emulsion and the silane modified water-based acrylic emulsion are selected as film forming matters, so that the film has excellent adhesive force and bonding performance on micro-nano particles, and has excellent wear resistance and chemical resistance.
Further, the self-repairing microcapsule is prepared by the following method:
adding 2.5g of emulsifier OP-10, 100g of distilled water and 18g of urea into a reactor c, stirring 500r/min until the emulsifier is dissolved, then adjusting the pH to 2.0-3.0 by using hydrogen chloride, adding 37g of vinyl silicone oil, 1g of 2-hydroxy-2-methyl propiophenone, dispersing 15min by 1500r/min, adjusting the rotating speed to 500r/min, adding 2g of 0.5% ammonium chloride aqueous solution, dropwise adding 27g of 37% formaldehyde aqueous solution into the reactor c at a uniform speed, dropwise adding the mixture for 20-25min, reacting for 2h at a constant temperature of 70 ℃, filtering after the reaction is finished, and cleaning a product by using distilled water, dimethylbenzene and ethanol to obtain the self-repairing microcapsule. The vinyl silicone oil is preferably V421-1300 of Shandong Dayi chemical industry Co.
Preferably, the self-repairing microcapsule is added into the coating, on one hand, the self-repairing microcapsule can be combined with sand flour, 400-mesh wollastonite powder and 200-mesh talcum powder to form a micro-rough coating surface, so that the contact area between water drops and the coating is reduced, on the other hand, when the coating is scratched, vinyl methyl silicone oil of a microcapsule capsule core can be released, and the microcapsule capsule core is solidified into a film under the action of ultraviolet light and an initiator to form a new hydrophobic surface, so that the self-repairing function is realized.
Further, the inorganic silicon resin consists of the following raw materials in parts by weight: propyl trimethoxysilane: 43-47, dimethyl dimethoxy silane: 7-9, methylpropyldimethoxy silane: 5-7, acidic silica sol: 4-6, deionized water: 13-17, hydrogen chloride: 0.1-0.2, methyl silicone oil: 1-2, hydroxy silicone oil: 3-5.
Further, the inorganic silicone resin is prepared by the following method:
step 1: adding propyl trimethoxy silane, dimethyl dimethoxy silane and methyl propyl dimethoxy silane according to the formula amount into a four-neck flask provided with a stirrer, a thermometer, a water diversion condensing device and a constant pressure dropping funnel, heating to 50 ℃, and stirring at a rotation speed of 800r/min;
step 2: evenly mixing deionized water and hydrogen chloride according to the formula amount to obtain a hydrochloric acid solution, and adding the hydrochloric acid solution into a constant-pressure dropping funnel;
step 3: dropping the hydrochloric acid solution in the constant-pressure dropping funnel into the four-necked flask at a constant speed within 20-30 minutes;
step 4: after the dripping is completed, the reaction temperature is raised to 65-80 ℃, hydroxyl silicone oil and acidic silica sol are added, a water diversion condensing device is used for discharging the reaction reflux, the reaction is carried out for 3 hours, and the heating is stopped;
step 5: cooling to below 30 ℃, adding methyl silicone oil, and stirring uniformly to obtain the inorganic silicone resin.
The inorganic silicone resin adopts three monomers of propyl trimethoxy silane, dimethyl dimethoxy silane and methyl propyl dimethoxy silane, the addition amount of deionized water is strictly controlled, and the excellent hardness and flexibility of the coating are ensured, and meanwhile, the silicone resin has excellent storage stability. According to the invention, the acidic silica sol is introduced into the inorganic silicon resin to form the organic-inorganic hybrid coating, the silica sol can construct a nano structure on the surface of the coating, and the nano structure is matched with other fillers to form the micro-nano coating surface, so that the hydrophobic property of the coating is enhanced.
Preferably, the viscosity of the methyl silicone oil is 300-500mPa.S, and the hydroxyl content of the hydroxyl silicone oil is 8%. The addition of the hydroxyl silicone oil can improve brittleness of the silicone resin, provide excellent flexibility of the coating film, and provide waxy micro-rough surface, reduce hydrophobic rolling angle of the coating film and provide excellent hydrophobic self-cleaning performance of the coating film. Preferably, the average particle size of the acidic silica sol is 40-60nm, and the PH is 2-4. KHAS-5030, a product of Kohne silicon Co., ltd, is preferred.
Preferably, the catalyst is isopropyl titanate and dibutyl tin dilaurate, and the ratio of the isopropyl titanate to the dibutyl tin dilaurate is 2:1.
The preparation method of the low-surface-energy bionic hydrophobic self-cleaning coating comprises the following steps:
s1: preparing a primer: adding deionized water, bentonite, a dispersing agent and a defoaming agent according to the formula amount, stirring for 15min at the speed of 800-1000 r/min, adding fluorosilicone emulsion, silane modified water-based acrylic emulsion, 400-mesh wollastonite powder, 200-mesh talcum powder, sand flour and self-repairing microcapsule, and stirring for 10-15 min at the speed of 500-600 r/min to obtain the primer of the low-surface-energy bionic hydrophobic self-cleaning coating;
s2: and (3) preparing a finishing paint A component: adding inorganic silicon resin, hydrophobic gas-phase white carbon black, molecular sieve and water converting agent according to the formula amount, and uniformly stirring at 800-1000 r/min to obtain a finish A component of the low-surface energy bionic hydrophobic self-cleaning coating;
s3: and (3) preparing a finishing paint B component: adding ethanol and a catalyst according to the formula amount, and stirring for 10min at 500-600 r/min to obtain a finish paint B component of the low-surface-energy bionic hydrophobic self-cleaning coating;
and the component A and the component B are packaged to obtain the finish paint of the low-surface-energy bionic hydrophobic self-cleaning coating.
The low-surface-energy bionic hydrophobic self-cleaning coating prepared by the invention constructs a micro-nano rough surface through the matching of the primer and the finish paint, the coating film has lower surface tension and bionic hydrophobic self-cleaning performance, when the coating film is scratched, the microcapsule can release vinyl silicone oil with a capsule core, the vinyl silicone oil is repaired and cured under the action of a photoinitiator and ultraviolet light to form a new hydrophobic surface, and the adhesive force of the ultra-smooth self-cleaning coating on a metal substrate can reach 0 level, and the ultra-smooth self-cleaning coating has excellent chemical resistance and weather resistance.
Detailed Description
The present invention will be described in further detail with reference to the following examples in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
The self-repairing microcapsule is prepared by the following method:
adding 2.5g of emulsifier OP-10, 100g of distilled water and 18g of urea into a reactor c, stirring 500r/min until the urea is dissolved, then adjusting the pH to 2.0-3.0 by hydrogen chloride, adding 37g of V421-1300 vinyl silicone oil, 1g of 2-hydroxy-2-methyl propiophenone, 1500r/min for 15min of dispersion, then adjusting the rotating speed to 500r/min, adding 2g of 0.5% ammonium chloride aqueous solution, dropwise adding 27g of 37% formaldehyde aqueous solution into the reactor c at a constant speed, dropwise adding the mixture into the reactor c for 20-25min, reacting at a constant temperature of 70 ℃ for 2h, performing suction filtration after the reaction is finished, and cleaning a product by using distilled water, dimethylbenzene and ethanol to obtain the self-repairing microcapsule.
The fluorosilicone emulsion is self-made emulsion and is prepared by the following method:
adding 0.4g of isomeric tridecanol polyoxyethylene ether, 0.2g of fatty alcohol polyoxyethylene ether, 1g of dodecylbenzene sulfonic acid, 60g of water, 54g of octamethyl cyclotetrasiloxane, 6g of trifluoropropyl-methyl cyclotrisiloxane and 1.2g of hexamethyldisiloxane into a reactor a, and stirring for 15 minutes in 1000r/min to obtain a pre-emulsion for later use; adding 1g of dodecylbenzene sulfonic acid and 80g of deionized water into a reactor b, uniformly stirring, and heating to 85-88 ℃; and (3) dropwise adding the pre-emulsified liquid in the reactor a into the reactor b for 1 hour, keeping the temperature of 85-88 ℃ for reacting for 5 hours, cooling to below 30 ℃, and adding 0.8g of ammonia water for neutralization to obtain the fluorosilicone emulsion.
The inorganic silicon resin is self-made resin, and the following table lists the formulas of six inorganic silicon resins, which are respectively represented by resin a, resin b, resin c, resin d, resin e and resin f. As shown in table one below.
List one
The preparation method comprises the following steps:
step 1: adding propyl trimethoxy silane, dimethyl dimethoxy silane and methyl propyl dimethoxy silane according to the formula amount into a four-neck flask provided with a stirrer, a thermometer, a water diversion condensing device and a constant pressure dropping funnel, heating to 50 ℃, and stirring at a rotation speed of 800r/min;
step 2: evenly mixing deionized water and hydrogen chloride according to the formula amount to obtain a hydrochloric acid solution, and adding the hydrochloric acid solution into a constant-pressure dropping funnel;
step 3: dropping the hydrochloric acid solution in the constant-pressure dropping funnel into the four-necked flask at a constant speed within 20-30 minutes;
step 4: after the dripping is completed, the reaction temperature is raised to 65-80 ℃, hydroxyl silicone oil and acidic silica sol are added, a water diversion condensing device is used for discharging the reaction reflux, the reaction is carried out for 3 hours, and the heating is stopped;
step 5: cooling to below 30 ℃, adding methyl silicone oil, and stirring uniformly to obtain the inorganic silicone resin.
The viscosity of the methyl silicone oil is 300-500mPa.S. The hydroxyl content of the hydroxyl silicone oil is 8%.
The following examples are provided to further illustrate embodiments of the invention.
Examples
Examples 1-3 respectively provide a low surface energy bionic hydrophobic self-cleaning coating, which consists of a primer and a top-coat, wherein the weight parts of the raw materials in the primer are shown in the following table two, and three groups of comparative examples 1-3 are listed:
watch II
Comparative example 3 the raw materials and the contents thereof were the same as in example 3 except that KRN8101 was replaced with an equivalent amount of the aqueous acrylic emulsion of RS-2806 of Baderfu.
The top coats of examples 1 to 3 and comparative examples 1 to 3 had the following contents of components:
the content of the component A is as follows: inorganic silicone resin (resin c): 92 R972:2.5,4A molecular sieves: 5, ALT-401:0.2; the content of the component B is as follows: isopropyl titanate: 1.2, dibutyl tin dilaurate: 0.6, ethanol: 9.
examples 4 to 5 respectively provide a low surface energy bionic hydrophobic self-cleaning coating, which consists of a primer and a top-coat, wherein the weight parts of raw materials in the primer are the same as those in example 3, the weight parts of raw materials in the top-coat A component are shown in the following Table III, and three groups of comparative examples 4 to 6 are listed.
Watch III
The component B corresponding to the component A consists of the following raw materials in parts by weight:
table four
Examples 1 to 5, and comparative examples 1 to 6 provide a method for preparing a coating material comprising the steps of:
s1: preparing a primer: adding deionized water, bentonite, a dispersing agent and a defoaming agent according to the formula amount, stirring for 15min at the speed of 800-1000 r/min, adding fluorosilicone emulsion, silane modified water-based acrylic emulsion, 400-mesh wollastonite powder, 200-mesh talcum powder, sand flour and self-repairing microcapsule, and stirring for 10-15 min at the speed of 500-600 r/min to obtain the primer of the low-surface-energy bionic hydrophobic self-cleaning coating;
s2: and (3) preparing a finishing paint A component: adding inorganic silicon resin, hydrophobic gas-phase white carbon black, molecular sieve and water converting agent according to the formula amount, and uniformly stirring at 800-1000 r/min to obtain a finish A component of the low-surface energy bionic hydrophobic self-cleaning coating;
s3: and (3) preparing a finishing paint B component: adding ethanol and a catalyst according to the formula amount, and stirring for 10min at 500-600 r/min to obtain a finish paint B component of the low-surface-energy bionic hydrophobic self-cleaning coating;
and the component A and the component B are packaged to obtain the finish paint of the low-surface-energy bionic hydrophobic self-cleaning coating.
Comparative example 7
This comparative example provides a low surface energy biomimetic hydrophobic self-cleaning coating whose composition is comparable to example 3, except that the top coat is stripped of the 4A molecular sieve, the remaining ingredients, content and preparation method remain the same as in example 3, and the coating is stored for 50 days at room temperature for gelation.
Comparative example 8
This comparative example provides a low surface energy biomimetic hydrophobic self-cleaning coating having a composition that is comparable to example 3, except that the top coat has ALT-401 removed, the remaining ingredients, content and preparation method remain the same as in example 3, and the coating is stored for 45 days at room temperature for a gel.
Test case
The low surface energy bionic hydrophobic self-cleaning coating prepared in each example is subjected to relevant performance test, and specific test results are shown in the following table four.
Table four
The low surface energy bionic hydrophobic self-cleaning coating prepared in each example is subjected to relevant performance test, and specific test results are shown in the following table five:
TABLE five
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, or alternatives falling within the spirit and principles of the invention.
Claims (6)
1. The low-surface-energy bionic hydrophobic self-cleaning coating is characterized by comprising a primer and a finish, wherein the primer consists of the following raw materials in parts by weight: deionized water: 17-19, bentonite: 1.5-2, dispersant: 0.5-1, defoamer: 0.5-1, fluorosilicone emulsion: 20-25, silane modified aqueous acrylic emulsion: 30-35, 400 mesh wollastonite powder: 8-10, 200 mesh talcum powder: 6-8, sand flour: 7-10, self-repairing microcapsule: 6-8; the finishing paint comprises a component A and a component B, wherein the component A consists of the following raw materials in parts by weight: inorganic silicon resin: 90-95, hydrophobic gas phase white carbon black: 2-3, molecular sieves: 3-6, water conversion agent: 0.1-0.3, wherein the component B consists of the following raw materials in parts by weight: ethanol: 7-10, catalyst: 1.5-2.1; the water conversion agent is an imine latent curing agent, the molecular sieve is a 4A molecular sieve, the hydrophobic gas phase white carbon black is R972 of Desoxhlet, and the average grain diameter of the sand flour is 85 mu m; the inorganic silicon resin consists of the following raw materials in parts by weight: propyl trimethoxysilane: 43-47, dimethyl dimethoxy silane: 7-9, methylpropyldimethoxy silane: 5-7, acidic silica sol: 4-6, deionized water: 13-17, hydrogen chloride: 0.1-0.2, methyl silicone oil: 1-2, hydroxy silicone oil: 3-5; the catalyst is isopropyl titanate and dibutyl tin dilaurate, and the ratio of the isopropyl titanate to the dibutyl tin dilaurate is 2:1; the self-repairing microcapsule is prepared by the following method: adding 2.5g of emulsifier OP-10, 100g of deionized water and 18g of urea into a reactor c, stirring 500r/min until the emulsifier is dissolved, then adding hydrogen chloride to regulate the pH value to 2.0-3.0, adding 37g of vinyl silicone oil, 1g of 2-hydroxy-2-methyl propiophenone, dispersing for 15min at 1500r/min, regulating the rotating speed to 500r/min, adding 2g of 0.5% ammonium chloride aqueous solution, dropwise adding 27g of 37% formaldehyde aqueous solution into the reactor c at a uniform speed, dropwise adding the mixture for 20-25min, reacting for 2h at a constant temperature of 70 ℃, filtering after the reaction is finished, and cleaning a product by using distilled water, dimethylbenzene and ethanol to obtain the self-repairing microcapsule.
2. The low surface energy biomimetic hydrophobic self-cleaning coating according to claim 1, wherein the fluorosilicone emulsion is prepared by the following method:
adding 0.4g of isomeric tridecanol polyoxyethylene ether, 0.2g of fatty alcohol polyoxyethylene ether, 1g of dodecylbenzene sulfonic acid, 60g of deionized water, 54g of octamethyl cyclotetrasiloxane, 6g of trifluoropropyl-methyl cyclotrisiloxane and 1.2g of hexamethyldisiloxane into a reactor a, and stirring for 15 minutes in 1000r/min to obtain a pre-emulsion for later use; adding 1g of dodecylbenzene sulfonic acid and 80g of deionized water into a reactor b, uniformly stirring, and heating to 85-88 ℃; and (3) dropwise adding the pre-emulsified liquid in the reactor a into the reactor b for 1 hour, reacting for 5 hours at 85-88 ℃ after dropwise adding, cooling to below 30 ℃, and adding 0.8g of ammonia water for neutralization to obtain the fluorosilicone emulsion.
3. The low surface energy biomimetic hydrophobic self-cleaning coating of claim 1, wherein the silane modified aqueous acrylic emulsion is KRN8101, a new material, inc. Jin Run in the city of ghe.
4. The low surface energy biomimetic hydrophobic self-cleaning coating according to claim 1, wherein the inorganic silicone resin is prepared by the following method:
step 1: adding propyl trimethoxy silane, dimethyl dimethoxy silane and methyl propyl dimethoxy silane according to the formula amount into a four-neck flask provided with a stirrer, a thermometer, a water diversion condensing device and a constant pressure dropping funnel, heating to 50 ℃, and stirring at a rotation speed of 800r/min;
step 2: evenly mixing deionized water and hydrogen chloride according to the formula amount to obtain a hydrochloric acid solution, and adding the hydrochloric acid solution into a constant-pressure dropping funnel;
step 3: dropping the hydrochloric acid solution in the constant-pressure dropping funnel into the four-necked flask at a constant speed within 20-30 minutes;
step 4: after the dripping is completed, the reaction temperature is raised to 65-80 ℃, hydroxyl silicone oil and acidic silica sol are added, a water diversion condensing device is used for discharging the reaction reflux, the reaction is carried out for 3 hours, and the heating is stopped;
step 5: cooling to below 30 ℃, adding methyl silicone oil, and stirring uniformly to obtain the inorganic silicone resin.
5. The low surface energy biomimetic hydrophobic self-cleaning coating according to claim 1, wherein the viscosity of the methyl silicone oil is 300-500mpa.s, the hydroxyl content of the hydroxyl silicone oil is 8%, the average particle size of the acidic silica sol is 40-60nm, and the ph is 2-4.
6. A method of preparing a low surface energy biomimetic hydrophobic self-cleaning coating as claimed in any one of claims 1 to 5, comprising the steps of:
s1: preparing a primer: adding deionized water, bentonite, a dispersing agent and a defoaming agent according to the formula amount, stirring for 15min at the rotation speed of 800-1000 r/min, adding fluorosilicone emulsion, silane modified aqueous acrylic emulsion, 400-mesh wollastonite powder, 200-mesh talcum powder, sand flour and self-repairing microcapsule, and stirring for 10-15 min at the rotation speed of 500-600 r/min to obtain the primer of the low-surface-energy bionic hydrophobic self-cleaning coating;
s2: and (3) preparing a finishing paint A component: adding inorganic silicon resin, hydrophobic fumed silica, a molecular sieve and a water conversion agent according to the formula amount, and uniformly stirring at 800-1000 r/min to obtain a finish A component of the low-surface-energy bionic hydrophobic self-cleaning coating;
s3: and (3) preparing a finishing paint B component: adding ethanol and a catalyst according to the formula amount, and stirring for 10min at 500-600 r/min to obtain a finishing paint B component of the low-surface-energy bionic hydrophobic self-cleaning coating;
and the component A and the component B are packaged to obtain the finish paint of the low-surface-energy bionic hydrophobic self-cleaning coating.
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