CN111560181A - Water-based antifogging coating and preparation method and application method thereof - Google Patents
Water-based antifogging coating and preparation method and application method thereof Download PDFInfo
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- CN111560181A CN111560181A CN202010133274.3A CN202010133274A CN111560181A CN 111560181 A CN111560181 A CN 111560181A CN 202010133274 A CN202010133274 A CN 202010133274A CN 111560181 A CN111560181 A CN 111560181A
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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
- 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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
- B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
- B05D7/24—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials for applying particular liquids or other fluent materials
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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
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
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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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
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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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/66—Additives characterised by particle size
- C09D7/67—Particle size smaller than 100 nm
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Nanotechnology (AREA)
- Inorganic Chemistry (AREA)
- Paints Or Removers (AREA)
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Abstract
The invention relates to a water-based antifogging coating, a preparation method and an application method thereof, wherein the water-based antifogging coating is prepared from the following components: polyhydroxy compound, cross-linking agent, catalyst, solvent and nano-particles. The water-based antifogging coating and the preparation method and the application method thereof provided by the invention completely use water as a solvent, so that the coating is more environment-friendly; 2 reaction kettles are adopted, wherein polyhydroxy compounds in one reaction kettle are pre-crosslinked in a crosslinking agent and a catalyst, and nanoparticles which contain hydroxyl groups and have large specific surface area are pre-crosslinked in the crosslinking agent and the catalyst; then mixing the two solutions, and continuing the crosslinking reaction, wherein the crosslinking reaction is more controllable; the hydroxyl-containing nanoparticles with large specific surface area participate in crosslinking reaction, so that a crosslinking network can be quickly formed, more hydrophilic groups can be displayed on the surface of the treated material by means of the large specific surface area, the strength, hydrophilicity and durability of the material are improved, the material is used for the surface of glass or other transparent high polymer materials, and the super-long hydrophilic anti-fog effect can be realized.
Description
Technical Field
The invention belongs to the technical field of water-based coatings, and particularly relates to a water-based antifogging coating as well as a preparation method and an application method thereof.
Background
The fogging phenomenon is caused because water vapor is liquefied and formed into small water drops on the surfaces of the lenses and the like when meeting cold, so that light rays are refracted and reflected, and the sight line is blurred. The generation of the fogging can affect the work and life of people.
At present, antifogging products on the market adopt a super-hydrophilic mode, and water drops form an even water film on the surface of a material after antifogging treatment, so that the sight is not influenced, and the aim of antifogging is fulfilled. The process routes mainly comprise two processes, one process adopts a surfactant for antifogging, but the duration is short; the other method is to adopt polymers such as acrylic ester or polyvinyl alcohol to form polymer gel through crosslinking for antifogging, but the method usually needs toxic or volatile alcohol ether solvents, which is not environment-friendly, and the crosslinking reaction has strict requirements on the process conditions, otherwise the crosslinking reaction is difficult to stably control, and the stability of the product quality is also influenced. Therefore, it is urgently needed to develop an antifogging material with controllable process, long-acting effect and environmental protection, which is applied to glasses, goggles, automobiles, bathrooms and the like to solve the fogging problem.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention aims to provide a water-based anti-fog coating and a preparation method and an application method thereof.
In order to achieve the purpose and achieve the technical effect, the invention adopts the technical scheme that:
the water-based antifogging coating is prepared from the following components in parts by weight:
2-20 parts of polyhydroxy compound
1-10 parts of cross-linking agent
0.001 to 0.1 portion of catalyst
50-100 parts of solvent
1-5 parts of nano particles.
Further, the polyhydroxy compound is selected from one or more of monosaccharide, polysaccharide or polyalcohol.
Further, the monosaccharide and the polysaccharide are respectively selected from one or more of glucose, galactan, mannan, galactan, glucan, low molecular weight chitosan and sodium carboxymethylcellulose.
Further, the polyalcohol is one or more of decaglycerol monooleate, hyaluronic acid, sorbitol, glycerol and castor oil.
Further, the cross-linking agent is selected from any one of dialkoxysilane, trialkoxysilane and isocyanate.
Further, the catalyst is selected from any one of phthalate ester and organic tin.
Further, the solvent is water or a mixture of water and ethanol.
Furthermore, the nano-particles are nano-silica containing hydroxyl functional groups and having the particle size of 15-30nm, and the specific surface area is more than 200m2/g。
Further, the method comprises the following steps:
the method comprises the following steps: at the temperature of 25-65 ℃, the polyhydroxy compound is stirred and dissolved in a solvent, a catalyst with a preset proportion of 1/2 is added, a cross-linking agent is added according to the quantity of 1/2, and the reaction lasts for 0.5-2h at the temperature of 45-65 ℃;
step two: dispersing the nano particles into another solvent with the same amount, adding a catalyst of 1/2 in a preset proportion, adding a cross-linking agent of 1/2 in a preset proportion, and reacting for 0.5-2h at 45-65 ℃;
step three: and (4) mixing the solutions obtained in the first step and the second step, and continuously reacting for 10-24h at 45-65 ℃ to obtain the required product.
Further, the method comprises the following steps: firstly, cleaning the surface of an article to be treated, then coating the water-based antifogging coating on the surface of the article to be treated, standing, airing or heating and drying, wherein the water contact angle of the surface of the article treated by the water-based antifogging coating is less than 10 degrees.
Compared with the prior art, the invention has the beneficial effects that:
the invention discloses a water-based antifogging coating and a preparation method and an application method thereof, wherein the water-based antifogging coating is prepared from the following components in parts by weight: 2-20 parts of polyhydroxy compound, 1-10 parts of cross-linking agent, 0.001-0.1 part of catalyst, 50-100 parts of solvent and 1-5 parts of nano-particles. The water-based antifogging coating and the preparation method and the application method thereof can completely use water as a solvent, and are more environment-friendly; 2 reaction kettles are adopted, wherein polyhydroxy compounds in one reaction kettle are pre-crosslinked in a crosslinking agent and a catalyst, and nanoparticles which contain hydroxyl groups and have large specific surface area are pre-crosslinked in the crosslinking agent and the catalyst; then mixing the two solutions, continuing crosslinking reaction, only adopting a two-step method, firstly carrying out pre-crosslinking, and controlling the crosslinking reaction to be more controllable; the nano-particles containing hydroxyl and having a large specific surface area participate in a crosslinking reaction, so that a crosslinking network can be quickly formed, the strength and durability of the coating are improved, more hydrophilic groups can be displayed on the surface of the treated material by means of the strong specific surface area of the nano-particles, and the strength, hydrophilicity and durability of the material are improved.
Detailed Description
The following detailed description of the embodiments of the present invention is provided to enable those skilled in the art to more easily understand the advantages and features of the present invention, and to clearly and clearly define the scope of the present invention.
The water-based antifogging coating is prepared from the following components in parts by weight:
2-20 parts of polyhydroxy compound
1-10 parts of cross-linking agent
0.001 to 0.1 portion of catalyst
50-100 parts of solvent
1-5 parts of hydroxyl-containing nanoparticles.
A preparation method of a water-based antifogging coating comprises the following steps:
the method comprises the following steps: taking a reaction kettle, stirring and dissolving a polyhydroxy compound into a solvent at the temperature of 25-65 ℃, adding a catalyst of 1/2 in a preset proportion, adding a cross-linking agent according to the quantity of 1/2 in a preset proportion, and reacting for 0.5-2h at the temperature of 45-65 ℃;
step two: dispersing the nano particles into another solvent (equal to the solvent in the step one) by using ultrasonic and stirring in another same reaction kettle, adding a catalyst of 1/2 in a preset proportion, adding a cross-linking agent of 1/2 in a preset proportion, and reacting for 0.5-2h at 45-65 ℃;
step three: and (4) mixing the solutions obtained in the first step and the second step, and continuously reacting for 10-24 hours at the temperature of 45-65 ℃ to obtain the required product.
An application method of a water-based antifogging coating comprises the following steps: firstly, cleaning the surface of an article to be treated, then coating the water-based antifogging coating on the surface of the article to be treated, standing and airing or heating and drying, wherein the water contact angle of the surface of the article treated by the water-based antifogging coating is less than 10 degrees.
The polyol is selected from one or more of the following materials in combination: the monosaccharide, the polysaccharide and the polyalcohol are respectively selected from one or more of the following materials in combination: glucose, galactan, mannan, galactan, glucan, low molecular weight chitosan, sodium carboxymethyl cellulose, polyols are selected from one or more of the following materials in combination: decaglycerol monooleate, hyaluronic acid, sorbitol, glycerol, and castor oil.
The cross-linking agent is selected from any one of the following materials: dialkoxysilanes, trialkoxysilanes, isocyanates.
The catalyst is selected from one of the following materials: phthalate esters, organotin.
The solvent is water or mixed solvent of water and ethanol, and the proportion of ethanol in the mixed solvent of water and ethanol is 1-20%.
The nano-particles are nano-silica with the particle size of 15-30nm, the surface of the nano-particles contains hydroxyl functional groups, and the specific surface area is very large and is more than 200m2/g。
Example 1
A preparation method of a water-based antifogging coating comprises the following steps:
the method comprises the following steps: taking a reaction kettle, stirring and dissolving 2g of polyhydroxy compound glucose into 25g of solvent water at the temperature of 25 ℃, adding 0.0005g of catalyst phthalate, adding 0.5g of cross-linking agent dialkoxysilane, and reacting for 2 hours at the temperature of 45 ℃;
step two: dispersing 1g of nano silicon dioxide particles into 25g of solvent water by using ultrasonic and stirring in another same reaction kettle, adding 0.0005g of catalyst phthalate, adding 0.5g of cross-linking agent dialkoxysilane, and reacting for 2 hours at 45 ℃;
step three: and (4) mixing the solutions obtained in the first step and the second step, and continuously stirring and reacting for 10 hours at the temperature of 45 ℃ to obtain the required product.
Example 2
A preparation method of a water-based antifogging coating comprises the following steps:
the method comprises the following steps: taking a reaction kettle, stirring and dissolving 20g of polyol decaglycerol monooleate into 50g of solvent water at the temperature of 25 ℃, adding 0.05g of catalyst phthalate, adding 5g of cross-linking agent isocyanate, and reacting for 2 hours at the temperature of 65 ℃;
step two: taking another same reaction kettle, dispersing 5g of nano silicon dioxide particles into 50g of solvent water by adopting ultrasonic and stirring, adding 0.05g of catalyst phthalate, adding 5g of cross-linking agent dialkoxy silane, and reacting for 2 hours at 65 ℃;
step three: and (4) mixing the solutions obtained in the first step and the second step, and continuously stirring and reacting for 24 hours at 65 ℃ to obtain the required product.
Example 3
A preparation method of a water-based antifogging coating comprises the following steps:
the method comprises the following steps: dissolving 10g of polyol decaglycerol monooleate into 40g of solvent water at 25 ℃ in a reaction kettle by stirring, adding 0.005g of catalyst phthalate, adding 1g of cross-linking agent dialkoxysilane, and reacting at 45 ℃ for 2 h;
step two: dispersing 2g of nano silicon dioxide particles into 40g of solvent water by using ultrasonic and stirring in another same reaction kettle, adding 0.005g of catalyst phthalate, adding 1g of cross-linking agent dialkoxy silane, and reacting for 2 hours at 45 ℃;
step three: and (4) mixing the solutions obtained in the first step and the second step, and continuously stirring and reacting for 10 hours at the temperature of 45 ℃ to obtain the required product.
Coating the water-based antifogging coatings obtained in the three embodiments 1-3 on the surface of a cleaned glass lens, putting the cleaned glass lens into a 65 ℃ oven, and drying for 30min to dryness to obtain three experimental groups; taking a glass lens coated with the anhydrous antifogging coating as a control group; and then, carrying out light transmittance test and water contact angle test on the three glass lenses containing the coatings prepared in the examples 1-3 and the glass lens without the coating in a control group, wherein light transmittance test equipment adopts a Beijing Prime analysis TU-1801 spectrophotometer to test light transmittance, the wavelength range is 400-700nm, water contact angle test equipment adopts Sanding SDC-350, and test results are shown in Table 1.
In order to verify the antifogging continuous effect a, the glass lens containing the coating is placed in an environment with humidity of 60-80%, the glass lens is placed on a steam humidifier to verify the antifogging effect a every 24h of test until the antifogging effect of more than 50% of the lens fails, and the maximum duration time is recorded.
In order to verify the antifogging continuous effect b, the glass lens containing the coating is directly placed above a steam humidifier, humidification is continuously carried out until more than 50% of the antifogging effect of the lens fails, and the maximum duration time is recorded.
TABLE 1
Analysis and test data show that the light transmittance of the three coated glass lenses prepared in examples 1-3 at 400-700nm is higher than 90% compared with that of a control group, which indicates that the increase of the aqueous antifogging coating does not affect the light transmittance. The water contact angle test results show that the water contact angles of the coated lenses are all below 10 deg.. In the antifogging effect test, the continuous antifogging effect a can last for more than 7 days by adopting an uncritical test method. When a more severe test method is adopted for testing, the three embodiments can achieve the antifogging duration effect b of more than 30 min.
The parts of the invention not described in detail can be realized by adopting the prior art, and are not described herein.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by the present specification, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. The water-based antifogging coating is characterized by being prepared from the following components in parts by weight:
2-20 parts of polyhydroxy compound
1-10 parts of cross-linking agent
0.001 to 0.1 portion of catalyst
50-100 parts of solvent
1-5 parts of nano particles.
2. The aqueous antifog coating of claim 1, wherein the polyol is selected from the group consisting of one or more of monosaccharides, polysaccharides, or polyols.
3. The aqueous antifog coating of claim 2, wherein said monosaccharides and polysaccharides are each selected from the group consisting of glucose, galactans, mannans, galactans, glucans, low molecular weight chitosans, sodium carboxymethylcellulose, and combinations thereof.
4. The aqueous antifog coating of claim 2, wherein the polyol is selected from the group consisting of decaglycerol monooleate, hyaluronic acid, sorbitol, glycerol, castor oil, and combinations thereof.
5. The water-based antifogging coating of claim 1, wherein the cross-linking agent is selected from any one of dialkoxysilane, trialkoxysilane, isocyanate.
6. The aqueous antifogging coating of claim 1, wherein the catalyst is selected from one of phthalate ester and organic tin.
7. The aqueous antifog coating of claim 1, wherein the solvent is water or a mixture of water and ethanol.
8. The water-based antifogging coating of claim 1, wherein the nanoparticles are nanosilica containing hydroxyl functional groups and having a particle size of 15-30nm and a specific surface area of > 200m2/g。
9. The preparation method of the water-based antifogging coating according to any one of claims 1 to 8, characterized by comprising the following steps:
the method comprises the following steps: at the temperature of 25-65 ℃, the polyhydroxy compound is stirred and dissolved in a solvent, a catalyst with a preset proportion of 1/2 is added, a cross-linking agent is added according to the quantity of 1/2, and the reaction lasts for 0.5-2h at the temperature of 45-65 ℃;
step two: dispersing the nano particles into another solvent with the same amount, adding a catalyst of 1/2 in a preset proportion, adding a cross-linking agent of 1/2 in a preset proportion, and reacting for 0.5-2h at 45-65 ℃;
step three: and (4) mixing the solutions obtained in the first step and the second step, and continuously reacting for 10-24h at 45-65 ℃ to obtain the required product.
10. The method for applying the water-based anti-fog coating according to any one of claims 1 to 8, characterized by comprising the following steps: firstly, cleaning the surface of an article to be treated, then coating the water-based antifogging coating on the surface of the article to be treated, standing, airing or heating and drying, wherein the water contact angle of the surface of the article treated by the water-based antifogging coating is less than 10 degrees.
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Cited By (1)
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| CN114381149A (en) * | 2022-01-04 | 2022-04-22 | 苏州浩纳新材料科技有限公司 | Super-hydrophilic coating material composition and application method thereof |
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Application publication date: 20200821 |
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| RJ01 | Rejection of invention patent application after publication |