CN111410877A - Method for preparing super-hydrophobic coating - Google Patents
Method for preparing super-hydrophobic coating Download PDFInfo
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- CN111410877A CN111410877A CN201910016101.0A CN201910016101A CN111410877A CN 111410877 A CN111410877 A CN 111410877A CN 201910016101 A CN201910016101 A CN 201910016101A CN 111410877 A CN111410877 A CN 111410877A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D133/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
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- C09D125/00—Coating compositions based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring; Coating compositions based on derivatives of such polymers
- C09D125/02—Homopolymers or copolymers of hydrocarbons
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- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
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- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/16—Antifouling paints; Underwater paints
- C09D5/1606—Antifouling paints; Underwater paints characterised by the anti-fouling agent
- C09D5/1612—Non-macromolecular compounds
- C09D5/1618—Non-macromolecular compounds inorganic
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- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/16—Antifouling paints; Underwater paints
- C09D5/1606—Antifouling paints; Underwater paints characterised by the anti-fouling agent
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- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/16—Antifouling paints; Underwater paints
- C09D5/1656—Antifouling paints; Underwater paints characterised by the film-forming substance
- C09D5/1662—Synthetic film-forming substance
- C09D5/1668—Vinyl-type polymers
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- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/16—Antifouling paints; Underwater paints
- C09D5/1656—Antifouling paints; Underwater paints characterised by the film-forming substance
- C09D5/1662—Synthetic film-forming substance
- C09D5/1675—Polyorganosiloxane-containing compositions
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- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
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- C09D5/1687—Use of special additives
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
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Abstract
A method for preparing a super-hydrophobic coating relates to a method for preparing the super-hydrophobic coating. The waterproof coating is invented mainly for solving the problem that the waterproof effect of the existing waterproof coating is limited. The raw materials used are: film forming matter, paint assistant, water and nanometer super-hydrophobic emulsion; and mixing the film-forming substance with the coating auxiliary agent, water and the nano super-hydrophobic emulsion, and uniformly stirring. The coating additive accounts for 10-300% of the weight of the film forming material, the effective active matter of the nano super-hydrophobic emulsion accounts for 0.1-20% of the sum of the weight of the film forming material and the weight of the coating additive, and the concentration of the effective active matter of the nano super-hydrophobic emulsion is 1-70%; the water is added in an amount to provide the viscosity required for conventional paint application. And an alkaline assistant can be added, wherein the alkaline assistant accounts for 0.1-20% of the sum of the weight of the film-forming substance and the weight of the paint assistant. Has the advantages of water repellency, dirt repellency and self-cleaning function which are not possessed by common waterproof coatings.
Description
The technical field is as follows:
the invention relates to a method for preparing a super-hydrophobic coating.
Background art:
at present, a lot of waterproof coatings are available on the market, but organic polymers or resins are mainly added to achieve the waterproof effect, and the waterproof effect of the coating is limited, because the surface of the coating is hydrophilic, water and dirt are easily adsorbed on the surface of the coating, so that the service life of the surface of the coating is short, mildew and discoloration occur, and the service life is shortened.
The invention content is as follows:
the invention aims to solve the technical problem of providing a method for preparing a super-hydrophobic coating with good waterproof effect, water repellency, dirt repellency and self-cleaning function.
The above object is achieved by:
the raw materials used are: film forming matter, paint assistant, water and nanometer super-hydrophobic emulsion; and mixing the film-forming substance with the coating auxiliary agent, water and the nano super-hydrophobic emulsion, and uniformly stirring.
The coating additive accounts for 10-300% of the weight of the film forming material, the effective active matter of the nano super-hydrophobic emulsion accounts for 0.1-20% of the sum of the weight of the film forming material and the weight of the coating additive, and the concentration of the effective active matter of the nano super-hydrophobic emulsion is 1-70%; the water is added in an amount to provide the viscosity required for conventional paint application.
The film forming material includes one or two or more of grease, natural resin, phenolic resin, asphalt, alkyd resin, amino resin, perchloroethylene resin, vinyl resin, acrylic resin, polyester resin, epoxy resin and polyurethane resin, and the mixing ratio is not limited.
The coating auxiliary agent is one or a mixture of two or more of organic and inorganic compounds or mixtures containing element calcium, and the mixing proportion is not limited, and specifically comprises fatty acid calcium, calcium stearate, calcium formate, calcium oxide/calcium hydroxide, calcium sulfate (gypsum or a gypsum mixture), putty (double flying powder, ash calcium, gypsum), calcium carbonate and calcium bicarbonate (double flying powder, calcite powder, coarse whiting powder/light whiting powder), portland cement and white cement, calcium silicate or silicon ash, calcium chloride and the like.
And an alkaline assistant can be added, wherein the alkaline assistant accounts for 0.1-20% of the sum of the weight of the film-forming substance and the weight of the paint assistant.
The alkaline auxiliary agent is any alkaline material capable of increasing the pH value of water, and comprises one or a mixture of two or more of sodium hydroxide or potassium, sodium carbonate or potassium, quicklime/hydrated lime, cement and the like, and the mixing ratio is not limited.
The preparation method comprises the following steps:
the first method is to mix the film-forming material with the paint auxiliary agent and water, and then to mix it with the nanometer super-hydrophobic emulsion.
And secondly, mixing the film-forming substance with the coating additive, the alkaline additive and water, and then fully mixing with the nano super-hydrophobic emulsion.
The third method is that the film forming matter and the nanometer super-hydrophobic emulsion are mixed in advance, the paint assistant, the alkali assistant and water are mixed in advance, and the two pre-mixed mixture is mixed and stirred evenly.
The fourth method is that the film forming matter, the nanometer super-hydrophobic emulsion and the paint assistant are mixed in advance, and then the mixture is mixed with the alkali assistant and the water and stirred fully and evenly.
After the hydrophobic coating is prepared, construction can be carried out according to a conventional coating brushing method, the surface of the super-hydrophobic coating is presented after the coating is completely dried, and the contact angle of water drops can reach or be more than 150oAnd exhibits free flow at the surface.
The super-hydrophobic paint can be coated on any surface which can be coated with common paint, such as cement, tiles, putty, gypsum, stone, wood, paper boards, metal, plastic, glass and the like. The brushing method includes brush brushing, rolling brushing, spraying method, etc.
The nano super-hydrophobic emulsion is prepared from the following raw materials: active, emulsifier, water; wherein the active matter accounts for 1-70% of the total weight of the nano hydrophobic emulsion, the emulsifier accounts for 0.1-10% of the total weight of the nano hydrophobic emulsion, and the water accounts for 98.9-20% of the total weight of the nano hydrophobic emulsion; the active content can be any solubility from 1% to 70% in industrial production;
the active matter of the nano hydrophobic emulsion is hydrogen-containing siloxane polymer (also called hydrogen-containing silicone oil), the hydrogen content of the active matter of the nano hydrophobic emulsion is 0.1-1.7%, and the molecular formula of the hydrogen-containing siloxane polymer is as follows:
(R)3SiO[RHSiO]nSi(R)3r = alkyl of 1-5 carbons;
the emulsifier is composed of a neutral surfactant and an anionic surfactant, and the mixing ratio of the two surfactants is not limited;
the neutral surfactant can be fatty alcohol, ether or ester compounds, or a mixture of the fatty alcohol, the ether or the ester compounds, and the mixing ratio is not limited;
the anionic surfactant is fatty sulfate, fatty sulfonate or fatty acid salt, or a mixture of the fatty sulfate, the fatty sulfonate and the fatty acid salt, and the mixing ratio is not limited;
the fatty alcohols may be: saturated or unsaturated alkanes containing at least 1 or more alcoholic hydroxyl groups (-OH) and 6-30 straight or branched chain carbons, and optionally 0-3 carboxyl groups (-COO-) derivatives. Such as lauryl alcohol, stearyl alcohol, and palmityl alcohol, and the like.
The ethers may be: saturated or unsaturated alkanes containing at least 1 or more ether groups (C-O-C) and at least two 6 to 30 straight or branched chain carbons, and also derivatives of polyethylene glycol, HO [ CH2CH2O ] n-H (n = 100-.
The ester compound may be: saturated or unsaturated fatty acid ester derivatives (-COOC-) containing 6-30 straight chain or branched chain carbons, and optionally 0-5 alcoholic hydroxyl groups, such as glyceryl distearate, glyceryl monostearate, etc.
The fatty acid or salt thereof may be: saturated or unsaturated fatty acid (-COOH) containing 6-30 straight chain or branched chain carbons, or its fatty acid salt (-COOM, M = Na, K, Ca, etc.) or fatty sulfate (ROSO)3 -) Or salts of fatty acids (RSO)3 -) For example oleic acid, sodium laurate, sodium lauryl sulfate and sodium dodecyl sulfate.
The preparation method of the nano hydrophobic emulsion comprises the following steps:
dissolving emulsifier in hot water of 50-80 deg.C, and mechanically stirring the mixture for 30 min until uniform emulsion is formed; when the temperature of the emulsion is reduced to about 25 ℃ at room temperature, regulating the pH value to 7 +/-1 by using a small amount of 10% hydrochloric acid or 10% sodium hydroxide solution; the emulsion was then stirred with a high shear at 800 to 2000rpm while slowly adding the active, and the mixture after addition was stirred at high speed for 30 minutes until a homogeneous milky concentrated emulsion was formed.
The invention has the advantages that: the nano super-hydrophobic coating can change the hydrophilic performance of the surface and the interior of the coating, so that the super-hydrophobic (water repellent/hydrophobic) characteristics (lotus effect) are formed inside and outside the coating, and the super-hydrophobic coating not only has better and stronger waterproof function, but also has the water repellent and dirt repellent and self-cleaning functions which are not possessed by common waterproof coatings, and keeps the surface clean for a long time and is not easy to stain.
The active matter in the super-hydrophobic emulsion can form nanometer porous grains with very low surface energy with the film forming matter and the inorganic matter in the paint assistant under the action of alkali material, and these grains have very strong hydrophobic characteristic and form homogeneous super-hydrophobic paint surface on the surface of the object with the film forming matter.
The specific implementation mode is as follows:
the raw materials used are: film forming matter, paint assistant, water and nanometer super-hydrophobic emulsion; and mixing the film-forming substance with the coating auxiliary agent, water and the nano super-hydrophobic emulsion, and uniformly stirring.
The coating additive accounts for 10-300% of the weight of the film forming material, the effective active matter of the nano super-hydrophobic emulsion accounts for 0.1-20% of the sum of the weight of the film forming material and the weight of the coating additive, and the concentration of the effective active matter of the nano super-hydrophobic emulsion is 1-70%; the water is added in an amount to provide the viscosity required for conventional paint application.
The film forming material includes one or two or more of grease, natural resin, phenolic resin, asphalt, alkyd resin, amino resin, perchloroethylene resin, vinyl resin, acrylic resin, polyester resin, epoxy resin and polyurethane resin, and the mixing ratio is not limited.
The coating auxiliary agent is one or a mixture of two or more of organic and inorganic compounds or mixtures containing element calcium, and the mixing proportion is not limited, and specifically comprises fatty acid calcium, calcium stearate, calcium formate, calcium oxide/calcium hydroxide, calcium sulfate (gypsum or a gypsum mixture), putty (double flying powder, ash calcium, gypsum), calcium carbonate and calcium bicarbonate (double flying powder, calcite powder, coarse whiting powder/light whiting powder), portland cement and white cement, calcium silicate or silicon ash, calcium chloride and the like.
And an alkaline assistant can be added, wherein the alkaline assistant accounts for 0.1-20% of the sum of the weight of the film-forming substance and the weight of the paint assistant.
The alkaline assistant is any alkaline material capable of increasing the pH value of water, and comprises one or a mixture of two or more of sodium hydroxide or potassium hydroxide, sodium carbonate or potassium carbonate, quicklime/hydrated lime, cement and the like, and the mixing ratio is not limited.
The preparation method comprises the following steps:
the first method is to mix the film-forming material with the paint auxiliary agent and water, and then to mix it with the nanometer super-hydrophobic emulsion.
And secondly, mixing the film-forming substance with the coating additive, the alkaline additive and water, and then fully mixing with the nano super-hydrophobic emulsion.
The third method is that the film forming matter and the nanometer super-hydrophobic emulsion are mixed in advance, the paint assistant, the alkali assistant and water are mixed in advance, and the two pre-mixed mixture is mixed and stirred evenly.
The fourth method is that the film forming matter, the nanometer super-hydrophobic emulsion and the paint assistant are mixed in advance, and then the mixture is mixed with the alkali assistant and the water and stirred fully and evenly.
After the hydrophobic coating is prepared, construction can be carried out according to a conventional coating brushing method, the surface of the super-hydrophobic coating is presented after the coating is completely dried, and the contact angle of water drops can reach or be more than 150oAnd exhibits free flow at the surface.
The super-hydrophobic paint can be coated on any surface which can be coated with common paint, such as cement, tiles, putty, gypsum, stone, wood, paper boards, metal, plastic, glass and the like. The brushing method includes brush brushing, rolling brushing, spraying method, etc.
The nano super-hydrophobic emulsion is prepared from the following raw materials: active, emulsifier, water; wherein the active matter accounts for 1-70% of the total weight of the nano hydrophobic emulsion, the emulsifier accounts for 0.1-10% of the total weight of the nano hydrophobic emulsion, and the water accounts for 98.9-20% of the total weight of the nano hydrophobic emulsion; the active content can be any solubility from 1% to 70% in industrial production;
the active matter of the nano hydrophobic emulsion is hydrogen-containing siloxane polymer (also called hydrogen-containing silicone oil), the hydrogen content of the active matter of the nano hydrophobic emulsion is 0.1-1.7%, and the molecular formula of the hydrogen-containing siloxane polymer is as follows:
(R)3SiO[RHSiO]nSi(R)3r = alkyl of 1-5 carbons;
the emulsifier is composed of a neutral surfactant and an anionic surfactant, and the mixing ratio of the two surfactants is not limited;
the neutral surfactant can be fatty alcohol, ether or ester compounds, or a mixture of the fatty alcohol, the ether or the ester compounds, and the mixing ratio is not limited;
the anionic surfactant is fatty sulfate, fatty sulfonate or fatty acid salt, or a mixture of the fatty sulfate, the fatty sulfonate and the fatty acid salt, and the mixing ratio is not limited;
the fatty alcohols may be: saturated or unsaturated alkanes containing at least 1 or more alcoholic hydroxyl groups (-OH) and 6-30 straight or branched chain carbons, and optionally 0-3 carboxyl groups (-COO-) derivatives. Such as lauryl alcohol, stearyl alcohol, and palmityl alcohol, and the like.
The ethers may be: saturated or unsaturated alkanes containing at least 1 or more ether groups (C-O-C) and at least two 6 to 30 straight or branched chain carbons, and also derivatives of polyethylene glycol, HO [ CH2CH2O ] n-H (n = 100-.
The ester compound may be: saturated or unsaturated fatty acid ester derivatives (-COOC-) containing 6-30 straight chain or branched chain carbons, and optionally 0-5 alcoholic hydroxyl groups, such as glyceryl distearate, glyceryl monostearate, etc.
The fatty acid or salt thereof may be: saturated or unsaturated fatty acid (-COOH) containing 6-30 straight chain or branched chain carbons, or its fatty acid salt (-COOM, M = Na, K, Ca, etc.) or fatty sulfate (ROSO)3 -) Or salts of fatty acids (RSO)3 -) For example oleic acid, sodium laurate, sodium lauryl sulfate and sodium dodecyl sulfate.
The preparation method of the nano hydrophobic emulsion comprises the following steps:
dissolving emulsifier in hot water of 50-80 deg.C, and mechanically stirring the mixture for 30 min until uniform emulsion is formed; when the temperature of the emulsion is reduced to about 25 ℃ at room temperature, regulating the pH value to 7 +/-1 by using a small amount of 10% hydrochloric acid or 10% sodium hydroxide solution; the emulsion was then stirred with a high shear at 800 to 2000rpm while slowly adding the active, and the mixture after addition was stirred at high speed for 30 minutes until a homogeneous milky concentrated emulsion was formed.
Example 1 (0.1% active effective content);
mixing 25 kg of acrylic resin and 5 kg of phenolic resin with 2 kg of calcium stearate, 1 kg of silica fume, 0.033 kg of quicklime and 4 kg of water, then fully mixing with 3.3 kg of nano super-hydrophobic emulsion with the concentration of 1% until a mixture with a homogeneous phase and a proper consistency is formed, constructing and applying by a normal coating method, and completely drying to present the hydrophobic surface characteristic.
Example 2 (effective actives content 4%);
20 kg of acrylic resin, 6 kg of alkyd resin and 4 kg of polyurethane resin are mixed with 10 kg of calcite, 5 kg of gypsum powder, 1.4 kg of slaked lime powder and 10 kg of water, then the mixture is fully mixed with 18 kg of nano super-hydrophobic emulsion with the concentration of 10% until a mixture with a homogeneous phase and a proper consistency is formed, the mixture is constructed and applied by a normal coating method, and the hydrophobic surface characteristic can be presented after the mixture is completely dried.
Example 3 (active effective content 10%);
mixing 25 kg of acrylic resin and 5 kg of grease with 12 kg of nano super-hydrophobic emulsion with the concentration of 50%, simultaneously mixing 20 kg of light calcium powder, 3 kg of calcium formate, 7 kg of gypsum powder, 6 kg of quicklime powder and 20 kg of water, then fully mixing the two mixtures until a mixture with a homogeneous phase and a proper consistency is formed, constructing and applying according to a normal coating method, and completely drying to present the hydrophobic surface characteristic.
Example 4 (effective active content 15%);
30 kg of polyurethane resin is mixed with 22 kg of nano super-hydrophobic emulsion with the concentration of 50%, 42 kg of light calcium powder, 3.4 kg of slaked lime powder and 30 kg of water are simultaneously mixed, then the two mixtures are fully mixed until a mixture with a homogeneous phase and a proper consistency is formed, the mixture is constructed and applied by a normal coating method, and the hydrophobic surface characteristic can be presented after the mixture is completely dried.
Example 5 (effective active content 20%);
mixing 20 kg of acrylic resin and 10 kg of amino resin with 80 kg of 30% nano super-hydrophobic emulsion, 50 kg of gypsum powder and 40 kg of double flying powder, simultaneously dissolving 2 kg of slaked lime powder and 1.6 kg of sodium hydroxide in 20 kg of water for mixing, then fully mixing the two mixtures until a mixture with a homogeneous phase and a proper consistency is formed, constructing and applying according to a normal coating method, and completely drying to present a hydrophobic surface characteristic.
Example 6 (effective actives content 8%);
30 kg of acrylic resin is mixed with 10 kg of nano super-hydrophobic emulsion with the concentration of 70%, 55 kg of double flying powder, 12 kg of calcium silicate, 5 kg of calcium hydroxide powder and 80 kg of water are mixed at the same time, then the two mixtures are fully mixed until a mixture with a homogeneous phase and a proper consistency is formed, the mixture is constructed and applied by a normal coating method, and the hydrophobic surface characteristic can be presented after the mixture is completely dried.
Example 7 (effective active content 7.5%);
firstly, mixing 25 kg of acrylic resin and 5 kg of polyurethane resin with 30 kg of nano super-hydrophobic emulsion with the concentration of 20%, simultaneously fully mixing 20 kg of putty powder, 25 kg of double flying powder, 5 kg of silica fume and 55 kg of water, fully mixing the two mixtures until a mixture with a homogeneous phase and a proper consistency is formed, constructing and applying by a normal coating method, and completely drying to present the hydrophobic surface characteristic.
Example 8 (active effective content 6%);
firstly, 15 kg of acrylic resin and 5 kg of alkyd resin are mixed with 19.2 kg of 10% nano super-hydrophobic emulsion, and simultaneously, 7 kg of calcite, 5 kg of gypsum powder, 5 kg of sodium carbonate, 1.4 kg of slaked lime powder and 18 kg of water are mixed, then the two mixtures are mixed together and fully mixed until a mixture with a homogeneous phase and a proper consistency is formed, the mixture is constructed and applied according to a normal coating method, and the hydrophobic surface characteristic can be presented after the mixture is completely dried.
Claims (10)
1. A method for preparing a super-hydrophobic coating is characterized by comprising the following steps: the raw materials used are: film forming matter, paint assistant, water and nanometer super-hydrophobic emulsion; and mixing the film-forming substance with the coating auxiliary agent, water and the nano super-hydrophobic emulsion, and uniformly stirring.
2. The method for preparing a superhydrophobic coating according to claim 1, wherein: the coating additive accounts for 10-300% of the weight of the film forming material, the effective active matter of the nano super-hydrophobic emulsion accounts for 0.1-20% of the sum of the weight of the film forming material and the weight of the coating additive, and the concentration of the effective active matter of the nano super-hydrophobic emulsion is 1-70%; the addition amount of the water is enough to form the viscosity required by the conventional coating brushing.
3. The method for preparing a superhydrophobic coating according to claim 1, wherein: the film forming material includes one or two or more of grease, natural resin, phenolic resin, asphalt, alkyd resin, amino resin, perchloroethylene resin, vinyl resin, acrylic resin, polyester resin, epoxy resin and polyurethane resin, and the mixing ratio is not limited.
4. The method for preparing a superhydrophobic coating according to claim 1, wherein: the coating auxiliary agent is one or a mixture of two or more of organic and inorganic compounds or mixtures containing element calcium, the mixing proportion is not limited, and the coating auxiliary agent specifically comprises fatty acid calcium, calcium stearate, calcium formate, calcium oxide/calcium hydroxide, calcium sulfate, putty, calcium carbonate and calcium bicarbonate, portland cement and white cement, calcium silicate or silica fume and calcium chloride.
5. The method for preparing a superhydrophobic coating according to claim 1 or 2, wherein: and an alkaline assistant can be added, wherein the alkaline assistant accounts for 0.1-20% of the sum of the weight of the film-forming substance and the weight of the paint assistant.
6. The method for preparing a superhydrophobic coating according to claim 5, wherein: the alkaline assistant is any alkaline material capable of increasing the pH value of water, and comprises one or a mixture of two or more of sodium hydroxide or potassium hydroxide, sodium carbonate or potassium carbonate, quicklime/hydrated lime, cement and the like, and the mixing ratio is not limited.
7. The method for preparing a superhydrophobic coating according to claim 1 or 5, wherein: the preparation method comprises the following steps:
firstly, mixing a film-forming substance with a coating additive and water, and then fully mixing the film-forming substance with the nano super-hydrophobic emulsion;
mixing the film-forming substance with the coating additive, the alkaline additive and water, and then fully mixing with the nano super-hydrophobic emulsion;
firstly, premixing a film-forming substance and the nano-sized super-hydrophobic emulsion, simultaneously premixing a coating additive, an alkaline additive and water, and finally, mixing the two premixed mixtures together and fully and uniformly stirring;
the fourth method is that the film forming matter, the nanometer super-hydrophobic emulsion and the paint assistant are mixed in advance, and then the mixture is mixed with the alkali assistant and the water and stirred fully and evenly.
8. The method for preparing a superhydrophobic coating according to claim 1, wherein: the nano super-hydrophobic emulsion is prepared from the following raw materials: active, emulsifier, water; wherein the active matter accounts for 1-70% of the total weight of the nano hydrophobic emulsion, the emulsifier accounts for 0.1-10% of the total weight of the nano hydrophobic emulsion, and the water accounts for 98.9-20% of the total weight of the nano hydrophobic emulsion; the active content can be any solubility from 1% to 70% in industrial production;
the active matter of the nano hydrophobic emulsion is hydrogen-containing siloxane polymer and nano hydrophobic emulsion
The active matter of the liquid contains 0.1-1.7% of hydrogen;
the emulsifier is composed of a neutral surfactant and an anionic surfactant, and the mixing ratio of the two surfactants is not limited;
the neutral surfactant can be fatty alcohol, ether or ester compound, or their mixture, and the mixing ratio is not limited.
9. The method for preparing a superhydrophobic coating according to claim 8, wherein: : the anionic surfactant is fatty sulfate, fatty sulfonate or fatty acid salt, or a mixture of the fatty sulfate, the fatty sulfonate and the fatty acid salt, and the mixing ratio is not limited; the fatty alcohols may be: saturated or unsaturated alkanes containing at least 1 or more alcoholic hydroxyl groups (-OH) and 6-30 straight or branched chain carbons, and optionally 0-3 carboxyl (-COO-) derivatives;
the ethers may be: containing at least 1 or more ether groups (C-O-C) and saturated or unsaturated alkanes containing at least two 6-30 linear or branched carbons, optionally derivatives of polyethylene glycol, HO [ CH2CH2O]n-H(n=100-100000)；
The ester compound may be: saturated or unsaturated fatty acid ester derivative (-COOC-) containing 6-30 straight chain or branched chain carbons, and optionally 0-5 alcoholic hydroxyl groups;
the fatty acid or the fatty acidThe salt may be: saturated or unsaturated fatty acid (-COOH) containing 6-30 straight chain or branched chain carbons, or its fatty acid salt (-COOM, M = Na, K, Ca, etc.) or fatty sulfate (ROSO)3 -) Or salts of fatty acids (RSO)3 -）。
10. The method for preparing a superhydrophobic coating according to claim 8, wherein: the preparation method of the nano hydrophobic emulsion comprises the following steps: dissolving emulsifier in hot water of 50-80 deg.C, and mechanically stirring the mixture for 30 min until uniform emulsion is formed; when the temperature of the emulsion is reduced to about 25 ℃ at room temperature, regulating the pH value to 7 +/-1 by using a small amount of 10% hydrochloric acid or 10% sodium hydroxide solution; the emulsion was then stirred with a high shear at 800 to 2000rpm while slowly adding the active, and the mixture after addition was stirred at high speed for 30 minutes until a homogeneous milky concentrated emulsion was formed.
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