CN115449274A - Water-based coil coating and preparation method thereof - Google Patents
Water-based coil coating and preparation method thereof Download PDFInfo
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- CN115449274A CN115449274A CN202211322894.7A CN202211322894A CN115449274A CN 115449274 A CN115449274 A CN 115449274A CN 202211322894 A CN202211322894 A CN 202211322894A CN 115449274 A CN115449274 A CN 115449274A
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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
- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G59/00—Polycondensates containing more than one epoxy group per molecule; Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
- C08G59/18—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing
- C08G59/40—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing characterised by the curing agents used
- C08G59/62—Alcohols or phenols
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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
- C09D5/08—Anti-corrosive paints
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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
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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
- C09D5/18—Fireproof paints including high temperature resistant paints
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- 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
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- 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
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/65—Additives macromolecular
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- 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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2237—Oxides; Hydroxides of metals of titanium
- C08K2003/2241—Titanium dioxide
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Abstract
The invention provides a water-based coil coating and a preparation method thereof, relating to the technical field of coatings, wherein the water-based coil coating comprises the following raw materials: modified epoxy resin, phenolic resin, enclosed isocyanate, ethanol, nano titanium dioxide, chitosan oligosaccharide, sulfated castor oil, sucrose fatty ester, wax powder, a dispersing agent, a defoaming agent, a leveling agent and water. The finally prepared water-based coil coating has excellent solvent resistance, corrosion resistance and hardness, and is safer and more environment-friendly.
Description
Technical Field
The invention relates to the technical field of coatings, and particularly relates to a water-based coil coating and a preparation method thereof.
Background
The coil coating is a professional coating which is prepared by coating the coating on a continuous metal sheet by adopting a rapid and automatic assembly line production mode, and achieves certain mechanical properties after curing, and the water-based coating replaces an organic solvent with water, so that the use of the organic solvent is reduced, and the effects of reducing cost and protecting environment are achieved. The water-based coil coating is divided into a primer, a back coating and a finish coating according to application characteristics, and the main component of the water-based coil coating is water-based resin. However, the development of the current water-based coil coating faces various restriction factors, such as: the surface tension of the water-based paint is high, and the wettability to resin high molecular substances is poor; the corrosion to coating equipment is high; strict requirements on construction environment conditions, poor water resistance of the coating, poor stability of the coating and bath solution and the like.
According to the literature: li Shan, gu Xi, qian Tingting, and the like, the research status and development trend of water-based coil coating [ J ] Anhui metallurgy, 2018 (2): 3, it is recorded that the current water-based coil coating is mainly a research on organic resins, including water-based acrylate resins, and other water-based resins. The patent CN108239220B discloses a self-cleaning, green and environment-friendly water-based coil coating prepared from water-based acrylic emulsion, which utilizes water-based acrylate resin to prepare the water-based coil coating; further disclosed is a water-based polyolefin coating and a preparation method thereof (patent US20160280951A 1). The prior art of coil coating preparation by using other water-based resins includes: the patent CN108441090B discloses a coil coating and a preparation method thereof, the coil coating comprises 45-55 parts of epoxy modified polyester resin, 12-18 parts of amino resin, 8-11 parts of a leveling agent, 10-20 parts of pigment, 10-18 parts of filler, 5-10 parts of a dispersing agent, 5-8 parts of a defoaming agent, 15-25 parts of a solvent and 5-8 parts of an antioxidant, and the problems of poor adhesion, low flexibility, poor scratch resistance and poor acid and alkali resistance of the coil coating can be solved. And the literature: xu Zhenyang, chen Wei, liu Junjie, etc. research on synthesis of waterborne polyester resin and waterborne coil coating [ J ] research on coating technology and abstract, 2017,38 (3): 6. Research on influence of type and amount of amino resin, curing conditions, auxiliaries and the like on waterborne coil coating and coating performance, and results show that the prepared waterborne coating has good comprehensive performance. As further documented: ouyang Lan, li Rui, linan, et al, research on waterborne polyester/epoxy coil primers [ C ]. National corrosion and surface protection technology, young forum 2009, research on waterborne saturated polyester and waterborne epoxy resin by combining with curing agent to obtain waterborne coil primers with excellent performance, and discuss the corrosion resistance. However, the water-based coil coating which is researched at present generally has the problems of poor solvent resistance and corrosion resistance, or the used raw materials are not friendly to the environment and have great toxicity to human bodies.
Aiming at the problems of poor solvent resistance and corrosion resistance, and poor safety and environmental protection of the water-based coil coating in the prior art, it is necessary to find a water-based coil coating with excellent comprehensive performance.
Disclosure of Invention
The invention provides the water-based coil coating and the preparation method thereof aiming at the problems in the prior art, and the prepared water-based coil coating has excellent solvent resistance and corrosion resistance, good hardness, safety and environmental protection.
In order to realize the purpose, the technical scheme adopted by the invention is as follows:
the invention provides a water-based coil coating, which comprises the following raw materials:
modified epoxy resin, phenolic resin, enclosed isocyanate, ethanol, nano titanium dioxide, chitosan oligosaccharide, sulfated castor oil, sucrose fatty acid ester, wax powder, a dispersing agent, a defoaming agent, a leveling agent and water.
Further, the water-based coil coating comprises the following raw materials in parts by weight: 100-120 parts of modified epoxy resin, 20-30 parts of phenolic resin, 2-5 parts of enclosed isocyanate, 9-14 parts of ethanol, 5-8 parts of nano titanium dioxide, 5-8 parts of chitosan oligosaccharide, 3-7 parts of sulfated castor oil, 4-9 parts of sucrose fatty acid ester, 3-5 parts of wax powder, 2-4 parts of dispersing agent, 0.5-2 parts of defoaming agent, 1-3 parts of flatting agent and 15-22 parts of water.
Preferably, the water-based coil coating comprises the following raw materials in parts by weight: 105-112 parts of modified epoxy resin, 22-28 parts of phenolic resin, 2-4 parts of isocyanate, 9-14 parts of ethanol, 6-8 parts of nano titanium dioxide, 6-8 parts of chitosan oligosaccharide, 4-6 parts of sulfated castor oil, 4-8 parts of sucrose fatty acid ester, 3-5 parts of wax powder, 2-3 parts of dispersing agent, 1-2 parts of defoaming agent, 1-2 parts of flatting agent and 15-20 parts of water.
Further preferably, the water-based coil coating comprises the following raw materials in parts by weight: 108 parts of modified epoxy resin, 24 parts of phenolic resin, 3 parts of isocyanate, 12 parts of ethanol, 7 parts of nano titanium dioxide, 7 parts of chitosan oligosaccharide, 5 parts of sulfated castor oil, 5 parts of sucrose fatty acid ester, 4 parts of wax powder, 2 parts of dispersing agent, 1 part of defoaming agent, 1 part of flatting agent and 18 parts of water.
Furthermore, the raw materials of the modified epoxy resin comprise epoxy resin, 2,5-di-tert-butyl hydroquinone, methyl methacrylate and N, N-dimethylaniline.
Further, the dispersing agent comprises one or more of polydimethylsiloxane, ethylene-vinyl acetate copolymer, polyethylene glycol and diacetyl tartaric acid monoglyceride and diglyceride.
Further, the defoamer comprises one or more of silica, polyester, and polyether siloxane; preferably silica.
Further, the weight ratio of the chitosan oligosaccharide, the sulfated castor oil and the sucrose fatty acid ester is 5-8:3-7:4-9.
Preferably, the weight ratio of the chitosan oligosaccharide, the sulfated castor oil and the sucrose fatty acid ester is 3-4:2-3:2-4.
Preferably, the weight ratio of the nano titanium dioxide to the chitosan oligosaccharide is 1:1.
Further, the invention also provides a preparation method of the water-based coil coating, which comprises the following steps:
(1) Preparing modified epoxy resin;
(2) Preparing a phenolic resin curing agent: mixing phenolic resin, blocked isocyanate and ethanol, and stirring to obtain the phenolic resin;
(3) And (3) mixing the epoxy resin obtained in the step (1), the phenolic resin curing agent obtained in the step (2), nano titanium dioxide, chitosan oligosaccharide, sulfated castor oil, sucrose fatty acid ester, wax powder, a dispersing agent, a defoaming agent, a leveling agent and water to obtain the epoxy resin.
Further, the preparation method of the modified epoxy resin in the step (1) comprises the following steps:
mixing the epoxy resin with 2,5-di-tert-butyl hydroquinone, stirring and heating, dripping mixed solution of methyl methacrylate and N, N-dimethylaniline, and then carrying out heat preservation reaction to obtain the epoxy resin.
In some embodiments, the preparation method of the modified epoxy resin in step (1) comprises the following steps:
mixing 100 parts of epoxy resin and 2.5 parts of 2,5-di-tert-butylhydroquinone, stirring and heating to 95 ℃, dripping a mixed solution of 20 parts of methyl methacrylate and 1 part of N, N-dimethylaniline, and then carrying out heat preservation reaction for 3 hours to obtain the epoxy resin. It is worth noting that the raw material proportion is the raw material proportion in the preparation of the modified epoxy resin, but not the raw material proportion in the preparation of the water-based coil coating.
Further, the water-based coil coating provided by the invention can be applied to coil product production.
The technical effects obtained by the invention are as follows:
according to the invention, epoxy resin is modified, wherein 2,5-di-tert-butylhydroquinone is used as a polymerization inhibitor, methyl methacrylate is used as a cross-linking agent, and N, N-dimethylaniline is used as a catalyst, so that the reaction time can be effectively reduced, and the reaction is more thorough. Meanwhile, the modified epoxy resin and the phenolic resin curing agent are matched for use, so that the coating has excellent corrosion resistance, high temperature resistance and weather resistance, and meanwhile, the instant curing problem of the water-based coating can be avoided, so that the performance of a final product is more excellent, and the application is wider; in addition, the chitosan, the sulfated castor oil and the sucrose fatty acid ester are matched for use, and the lipophilic and hydrophilic amphiphilic performance of the sucrose fatty acid ester and the synergistic cooperation effect of the raw materials are fully utilized, so that the defect that the water-based epoxy resin coating is crisp is overcome, and the resin has better compatibility with water and better storage stability. In addition, the water-based coil coating disclosed by the invention uses chitosan in combination with nano titanium dioxide, so that the antibacterial property is improved, and the dispersibility of the raw materials in a system can be improved. The safety and the environmental protection performance of the finally prepared product are also better when all the raw materials are matched for use.
Detailed Description
The following embodiments of the present invention are provided by way of specific examples, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure herein. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
Before the present embodiments are further described, it is to be understood that the scope of the invention is not limited to the particular embodiments described below; it is also to be understood that the terminology used in the examples herein is for the purpose of describing particular embodiments only, and is not intended to limit the scope of the present invention.
When numerical ranges are given in the examples, it is understood that both endpoints of each of the numerical ranges and any number between the two endpoints are optional unless otherwise specified in the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It should be noted that the leveling agent used in the present invention is the digao leveling agent 2100, the epoxy resin is the epoxy resin E44, and the other raw materials are all common commercial products, and therefore, the source thereof is not particularly limited.
Preparing the raw materials according to the formula dosage to obtain the water-based coil coating, and carrying out performance test, wherein the test method specifically comprises the following steps:
(1) Salt spray resistance: reference GB/T1771-2007 test of neutral salt fog resistance of colored paint and varnish
(2) MEK (methyl ethyl ketone) resistance wiping performance: testing according to ASTM D5402-2019 Standard practice for evaluating solvent resistance of organic coatings by using solvent abrasion, and counting the wiping times;
(3) Hardness: testing according to GB/T6739-2006 paint film hardness determination by color paint and varnish pencil method;
(4) Acid resistance: particularly, soaking the substrate in a sulfuric acid solution with the concentration of 5wt% for 24 hours, and observing the change condition of the surface;
(5) Alkali resistance: specifically, the sample was immersed in a 5wt% sodium hydroxide solution for 24 hours, and the surface change was observed.
Preparation of a sample before testing: and (3) after passivating the galvanized plate with the thickness of 10cm multiplied by 5cm, uniformly rolling the prepared coating, and baking for 40-45s at about 225 ℃ to obtain the sample plate with the coating.
The specific formula, preparation and properties of the water-based coil coating are as follows:
example 1
An aqueous coil coating material comprises the following raw materials: 100 parts of modified epoxy resin, 20 parts of phenolic resin, 2 parts of blocked isocyanate, 9 parts of ethanol, 5 parts of nano titanium dioxide, 5 parts of chitosan oligosaccharide, 3 parts of sulfated castor oil, 4 parts of sucrose fatty acid ester, 3 parts of wax powder, 2 parts of dispersing agent (polydimethylsiloxane), 0.5 part of defoaming agent (silicon dioxide), 1 part of flatting agent and 15 parts of water.
The preparation method of the water-based coil coating comprises the following steps:
(1) Preparing modified epoxy resin: mixing 100 parts of epoxy resin and 2.5 parts of 2,5-di-tert-butylhydroquinone, stirring and heating to 95 ℃, dripping a mixed solution of 20 parts of methyl methacrylate and 1 part of N, N-dimethylaniline, and then carrying out heat preservation reaction for 3 hours to obtain the epoxy resin;
(2) Preparing a phenolic resin curing agent: mixing phenolic resin, blocked isocyanate and ethanol, and stirring to obtain the phenolic resin;
(3) And (3) mixing the epoxy resin obtained in the step (1), the phenolic resin curing agent obtained in the step (2), nano titanium dioxide, chitosan oligosaccharide, sulfated castor oil, sucrose fatty acid ester, wax powder, a dispersing agent, a defoaming agent, a leveling agent and water to obtain the epoxy resin.
The salt spray resistance time of the water-based coil coating prepared by the scheme is 718H, no discoloration or no foaming exists in an acid resistance or alkali resistance test, the wiping frequency of methyl ethyl ketone is 205 times, and the hardness is 4H.
Example 2
An aqueous coil coating material comprises the following raw materials: 120 parts of modified epoxy resin, 30 parts of phenolic resin, 5 parts of blocked isocyanate, 14 parts of ethanol, 8 parts of nano titanium dioxide, 8 parts of chitosan oligosaccharide, 7 parts of sulfated castor oil, 9 parts of sucrose fatty acid ester, 5 parts of wax powder, 4 parts of dispersing agent (polyethylene glycol), 2 parts of defoaming agent (silicon dioxide), 3 parts of flatting agent and 22 parts of water.
The preparation method is the same as example 1.
The salt spray resistance time of the water-based coil coating prepared by the scheme is 725 hours, the water-based coil coating does not change color or foam in an acid resistance or alkali resistance test, the wiping frequency of methyl ethyl ketone is 210 times, and the hardness is 4H.
Example 3
An aqueous coil coating material comprises the following raw materials: 105 parts of modified epoxy resin, 22 parts of phenolic resin, 2 parts of isocyanate, 9 parts of ethanol, 6 parts of nano titanium dioxide, 6 parts of chitosan oligosaccharide, 4 parts of sulfated castor oil, 4 parts of sucrose fatty acid ester, 3 parts of wax powder, 2 parts of dispersing agent (polydimethylsiloxane), 1 part of defoaming agent (silicon dioxide), 1 part of flatting agent and 15 parts of water.
The preparation method is the same as example 1.
The salt spray resistance time of the water-based coil coating prepared by the scheme is 750H, no discoloration or no foaming exists in an acid resistance or alkali resistance test, the wiping frequency of methyl ethyl ketone is 219 times, and the hardness is 4H.
Example 4
An aqueous coil coating material comprises the following raw materials: 112 parts of modified epoxy resin, 28 parts of phenolic resin, 4 parts of isocyanate, 14 parts of ethanol, 8 parts of nano titanium dioxide, 8 parts of chitosan oligosaccharide, 6 parts of sulfated castor oil, 8 parts of sucrose fatty acid ester, 5 parts of wax powder, 3 parts of dispersing agent (polyethylene glycol), 2 parts of defoaming agent (silicon dioxide), 2 parts of flatting agent and 20 parts of water.
The preparation method is the same as example 1.
The salt spray resistance time of the water-based coil coating prepared by the scheme is 746H, no discoloration or no foaming exists in an acid resistance or alkali resistance test, the wiping frequency of methyl ethyl ketone is 215 times, and the hardness is 4H.
Example 5
An aqueous coil coating material comprises the following raw materials: 108 parts of modified epoxy resin, 24 parts of phenolic resin, 3 parts of isocyanate, 12 parts of ethanol, 7 parts of nano titanium dioxide, 7 parts of chitosan oligosaccharide, 5 parts of sulfated castor oil, 5 parts of sucrose fatty acid ester, 4 parts of wax powder, 2 parts of dispersing agent (polydimethylsiloxane), 1 part of defoaming agent (silicon dioxide), 1 part of flatting agent and 18 parts of water.
The preparation method is the same as example 1.
The salt spray resistance time of the water-based coil coating prepared by the scheme is 759H, no discoloration or no foaming exists in an acid resistance or alkali resistance test, the wiping frequency of methyl ethyl ketone is 227 times, and the hardness is 5H.
Comparative example 1
The only difference from example 1 is that without the addition of chitosan oligosaccharide (replaced by an equal proportional amount of sulfated castor oil and sucrose fatty acid ester), the specific raw materials include: 100 parts of modified epoxy resin, 20 parts of phenolic resin, 2 parts of blocked isocyanate, 9 parts of ethanol, 5 parts of nano titanium dioxide, 5.1 parts of sulfated castor oil, 6.9 parts of sucrose fatty acid ester, 3 parts of wax powder, 2 parts of dispersing agent (polydimethylsiloxane), 0.5 part of defoaming agent (silicon dioxide), 1 part of flatting agent and 15 parts of water.
The preparation method of the water-based coil coating comprises the following steps:
(1) Preparing modified epoxy resin: mixing 100 parts of epoxy resin and 2.5 parts of 2,5-di-tert-butylhydroquinone, stirring and heating to 95 ℃, dripping a mixed solution of 20 parts of methyl methacrylate and 1 part of N, N-dimethylaniline, and then carrying out heat preservation reaction for 3 hours to obtain the epoxy resin;
(2) Preparing a phenolic resin curing agent: mixing phenolic resin, blocked isocyanate and ethanol, and stirring to obtain the phenolic resin;
(3) And (3) mixing the epoxy resin obtained in the step (1), the phenolic resin curing agent obtained in the step (2), nano titanium dioxide, sulfated castor oil, sucrose fatty acid ester, wax powder, a dispersing agent, a defoaming agent, a leveling agent and water to obtain the epoxy resin.
The salt spray resistance time of the water-based coil coating prepared by the scheme is 702H, no discoloration or no foaming exists in an acid resistance or alkali resistance test, the wiping frequency of methyl ethyl ketone is 190 times, and the hardness is 4H.
Comparative example 2
The only difference from example 1 is that no sulfated castor oil was added. The concrete raw materials comprise: 100 parts of modified epoxy resin, 20 parts of phenolic resin, 2 parts of blocked isocyanate, 9 parts of ethanol, 5 parts of nano titanium dioxide, 6.7 parts of chitosan oligosaccharide, 5.3 parts of sucrose fatty acid ester, 3 parts of wax powder, 2 parts of dispersing agent (polydimethylsiloxane), 0.5 part of defoaming agent (silicon dioxide), 1 part of flatting agent and 15 parts of water.
The preparation method of the water-based coil coating comprises the following steps:
(1) Preparing modified epoxy resin, mixing 100 parts of epoxy resin and 2.5 parts of 2,5-di-tert-butylhydroquinone, stirring and heating to 95 ℃, dripping a mixed solution of 20 parts of methyl methacrylate and 1 part of N, N-dimethylaniline, and then carrying out heat preservation reaction for 3 hours to obtain the modified epoxy resin;
(2) Preparing a phenolic resin curing agent: mixing phenolic resin, blocked isocyanate and ethanol, and stirring to obtain the phenolic resin;
(3) And (3) mixing the epoxy resin obtained in the step (1), the phenolic resin curing agent obtained in the step (2), nano titanium dioxide, chitosan oligosaccharide, sucrose fatty acid ester, wax powder, a dispersing agent, a defoaming agent, a leveling agent and water to obtain the epoxy resin coating.
The salt spray resistance time of the water-based coil coating prepared by the scheme is 690H, no discoloration or no foaming exists in an acid resistance or alkali resistance test, the wiping frequency of the methyl ethyl ketone is 195 times, and the hardness is 4H.
Comparative example 3
The only difference from example 1 is that no sucrose fatty acid ester was added. The concrete raw materials comprise: 100 parts of modified epoxy resin, 20 parts of phenolic resin, 2 parts of blocked isocyanate, 9 parts of ethanol, 5 parts of nano titanium dioxide, 7.5 parts of chitosan oligosaccharide, 4.5 parts of sulfated castor oil, 3 parts of wax powder, 2 parts of dispersing agent (polydimethylsiloxane), 0.5 part of defoaming agent (silicon dioxide), 1 part of flatting agent and 15 parts of water.
The preparation method of the water-based coil coating comprises the following steps:
(1) Preparing modified epoxy resin, mixing 100 parts of epoxy resin and 2.5 parts of 2,5-di-tert-butylhydroquinone, stirring and heating to 95 ℃, dripping a mixed solution of 20 parts of methyl methacrylate and 1 part of N, N-dimethylaniline, and then carrying out heat preservation reaction for 3 hours to obtain the modified epoxy resin;
(2) Preparing a phenolic resin curing agent: mixing phenolic resin, blocked isocyanate and ethanol, and stirring to obtain the phenolic resin;
(3) And (3) mixing the epoxy resin obtained in the step (1), the phenolic resin curing agent obtained in the step (2), nano titanium dioxide, chitosan oligosaccharide, sulfated castor oil, wax powder, a dispersing agent, a defoaming agent, a leveling agent and water to obtain the epoxy resin.
The salt spray resistance time of the water-based coil coating prepared by the scheme is 684H, the water-based coil coating discolors and foams in an acid resistance or alkali resistance test, the wiping frequency of methyl ethyl ketone is 182 times, and the hardness is 3H.
Comparative example 4
The difference from the embodiment 1 is only that the dosage of the nano titanium dioxide is different from that of the chitosan oligosaccharide. The concrete raw materials comprise: 100 parts of modified epoxy resin, 20 parts of phenolic resin, 2 parts of blocked isocyanate, 9 parts of ethanol, 1 part of nano titanium dioxide, 9 parts of chitosan oligosaccharide, 3 parts of sulfated castor oil, 4 parts of sucrose fatty acid ester, 3 parts of wax powder, 2 parts of dispersing agent (polydimethylsiloxane), 0.5 part of defoaming agent (silicon dioxide), 1 part of flatting agent and 15 parts of water.
The preparation method of the water-based coil coating comprises the following steps:
(1) Preparing modified epoxy resin: mixing 100 parts of epoxy resin and 2.5 parts of 2,5-di-tert-butylhydroquinone, stirring and heating to 95 ℃, dripping a mixed solution of 20 parts of methyl methacrylate and 1 part of N, N-dimethylaniline, and then carrying out heat preservation reaction for 3 hours to obtain the epoxy resin;
(2) Preparing a phenolic resin curing agent: mixing phenolic resin, blocked isocyanate and ethanol, and stirring to obtain the phenolic resin;
(3) And (3) mixing the epoxy resin obtained in the step (1), the phenolic resin curing agent obtained in the step (2), nano titanium dioxide, chitosan oligosaccharide, sulfated castor oil, sucrose fatty acid ester, wax powder, a dispersing agent, a defoaming agent, a leveling agent and water to obtain the epoxy resin.
The salt spray resistance time of the water-based coil coating prepared by the scheme is 693H, no discoloration occurs in an acid resistance or alkali resistance test, foaming occurs, the wiping frequency of methyl ethyl ketone is 176 times, and the hardness is 4H. The scheme is mainly used for researching the influence of the addition ratio of the chitosan oligosaccharide and the nano titanium dioxide on the product. In addition, in other tests, it is found that the effects of salt spray resistance, methyl ethyl ketone wiping frequency and the like of the finally obtained water-based coil coating are still inferior to those of the product in the example 1 even if only the chitosan oligosaccharide or only the nano titanium dioxide is added, and the addition amount is consistent with the total addition amount of the original chitosan oligosaccharide or nano titanium dioxide.
Finally, it should be noted that the above-mentioned contents are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, and that the simple modifications or equivalent substitutions of the technical solutions of the present invention by those of ordinary skill in the art can be made without departing from the spirit and scope of the technical solutions of the present invention.
Claims (10)
1. An aqueous coil coating, which is characterized in that: the raw materials comprise:
modified epoxy resin, phenolic resin, blocked isocyanate, ethanol, nano titanium dioxide, chitosan oligosaccharide, sulfated castor oil, sucrose fatty acid ester, wax powder, a dispersing agent, a defoaming agent, a leveling agent and water.
2. The aqueous coil coating of claim 1, characterized by: the raw materials comprise the following components in parts by weight: 100-120 parts of modified epoxy resin, 20-30 parts of phenolic resin, 2-5 parts of enclosed isocyanate, 9-14 parts of ethanol, 5-8 parts of nano titanium dioxide, 5-8 parts of chitosan oligosaccharide, 3-7 parts of sulfated castor oil, 4-9 parts of sucrose fatty acid ester, 3-5 parts of wax powder, 2-4 parts of dispersing agent, 0.5-2 parts of defoaming agent, 1-3 parts of flatting agent and 15-22 parts of water.
3. The aqueous coil coating of claim 2, characterized in that: the raw materials comprise the following components in parts by weight: 105-112 parts of modified epoxy resin, 22-28 parts of phenolic resin, 2-4 parts of isocyanate, 9-14 parts of ethanol, 6-8 parts of nano titanium dioxide, 6-8 parts of chitosan oligosaccharide, 4-6 parts of sulfated castor oil, 4-8 parts of sucrose fatty acid ester, 3-5 parts of wax powder, 2-3 parts of dispersing agent, 1-2 parts of defoaming agent, 1-2 parts of flatting agent and 15-20 parts of water.
4. The aqueous coil coating of claim 1, characterized by: the raw materials of the modified epoxy resin comprise epoxy resin, 2,5-di-tert-butyl hydroquinone, methyl methacrylate and N, N-dimethylaniline.
5. The aqueous coil coating of claim 1, characterized by: the dispersing agent comprises one or more of polydimethylsiloxane, ethylene-vinyl acetate copolymer, polyethylene glycol and diacetyl tartaric acid monoglyceride and diglyceride.
6. The aqueous coil coating of claim 1, characterized by: the defoamer comprises one or more of silica, polyester, and polyether siloxane.
7. The aqueous coil coating of claim 1, characterized by: the weight ratio of the chitosan oligosaccharide, the sulfated castor oil and the sucrose fatty acid ester is 5-8:3-7:4-9.
8. The aqueous coil coating of claim 1, characterized by: the weight ratio of the chitosan oligosaccharide, the sulfated castor oil and the sucrose fatty acid ester is 3-4:2-3:2-4.
9. The process for preparing an aqueous coil coating according to any of claims 1 to 8, characterized in that: the method comprises the following steps:
(1) Preparing modified epoxy resin;
(2) Preparing a phenolic resin curing agent: mixing phenolic resin, blocked isocyanate and ethanol, and stirring to obtain the phenolic resin;
(3) And (3) mixing the epoxy resin obtained in the step (1), the phenolic resin curing agent obtained in the step (2), nano titanium dioxide, chitosan oligosaccharide, sulfated castor oil, sucrose fatty acid ester, wax powder, a dispersing agent, a defoaming agent, a leveling agent and water to obtain the epoxy resin.
10. Use of an aqueous coil coating according to any of claims 1 to 8 in the production of coil products.
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| CN202211322894.7A CN115449274A (en) | 2022-10-27 | 2022-10-27 | Water-based coil coating and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211322894.7A CN115449274A (en) | 2022-10-27 | 2022-10-27 | Water-based coil coating and preparation method thereof |
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| CN115449274A true CN115449274A (en) | 2022-12-09 |
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| JPH11349894A (en) * | 1998-04-06 | 1999-12-21 | Kansai Paint Co Ltd | Aqueous coating composition |
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| CN108441090A (en) * | 2018-02-28 | 2018-08-24 | 东莞市大兴化工有限公司 | Coil coating and preparation method thereof |
| CN108624197A (en) * | 2018-05-29 | 2018-10-09 | 中山创美涂料有限公司 | A kind of aqueous coiled material finishing oil and preparation method thereof |
| CN108997902A (en) * | 2018-09-03 | 2018-12-14 | 王劲 | A kind of resistance to deep-draw high temperature resistant does not adhere to coil coating and preparation method thereof |
| CN114133833A (en) * | 2021-12-31 | 2022-03-04 | 江苏扬瑞新材料有限公司 | Coil coating and preparation method thereof |
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2022
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| JPH11349894A (en) * | 1998-04-06 | 1999-12-21 | Kansai Paint Co Ltd | Aqueous coating composition |
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