CN110982396B - High-corrosion-resistance color plate coil coating - Google Patents
High-corrosion-resistance color plate coil coating Download PDFInfo
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- CN110982396B CN110982396B CN201911165320.1A CN201911165320A CN110982396B CN 110982396 B CN110982396 B CN 110982396B CN 201911165320 A CN201911165320 A CN 201911165320A CN 110982396 B CN110982396 B CN 110982396B
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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
- C09D167/00—Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Coating compositions based on derivatives of such polymers
- C09D167/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
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- C—CHEMISTRY; METALLURGY
- 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
- C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
- C08G63/02—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds
- C08G63/12—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from polycarboxylic acids and polyhydroxy compounds
- C08G63/16—Dicarboxylic acids and dihydroxy compounds
- C08G63/20—Polyesters having been prepared in the presence of compounds having one reactive group or more than two reactive groups
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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
- C09D127/00—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 a halogen; Coating compositions based on derivatives of such polymers
- C09D127/02—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 a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment
- C09D127/12—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 a halogen; Coating compositions based on derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
- C09D127/16—Homopolymers or copolymers of vinylidene fluoride
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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
- C09D5/002—Priming 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
- 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
- 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
- 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
- C09D5/32—Radiation-absorbing paints
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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
- 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
- C08K2003/221—Oxides; Hydroxides of metals of rare earth metal
- C08K2003/2213—Oxides; Hydroxides of metals of rare earth metal of cerium
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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
- 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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- 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
- 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
- C08K2003/2296—Oxides; Hydroxides of metals of zinc
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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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/30—Sulfur-, selenium- or tellurium-containing compounds
- C08K2003/3045—Sulfates
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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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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
Abstract
The invention relates to the technical field of paint preparation, in particular to a paint for a pre-coated color plate. The high-corrosion-resistance color plate coil coating designed by the invention consists of a primer and a finish, wherein the thickness of the primer is 10-15 mu m, and the thickness of the finish is 18-20 mu m; the primer consists of polyester resin, amino resin, a closed curing agent, pigment, filler, a dispersing agent, a flatting agent, a defoaming agent, a catalyst and a solvent; the finish paint is composed of PVDF resin, acrylic resin, amino resin, a leveling agent, a solvent, a catalyst, a nano assistant and an ultraviolet absorber. The paint film of the invention has high gloss, excellent outdoor weather resistance and high corrosion resistance in severe corrosive environment.
Description
Technical Field
The invention relates to the technical field of paint preparation, in particular to a paint for a pre-coated color plate.
Background
The color coated steel plate is prepared by using a cold-rolled plate, a galvanized steel plate or an aluminized zinc plate as a substrate, performing surface pretreatment, coating materials on the substrate in a continuous roller coating mode, and baking and cooling. The color-coated sheet combines the mechanical strength and the processability of a steel plate and the mechanical property, the corrosion resistance and the decoration of a high polymer material, so that the color-coated sheet is widely applied to buildings, household appliances, furniture, automobile industry and the like. The main consumption field of color-coated sheets in China is the construction industry, but common building color-coated sheet coatings sold in the market mainly comprise polyester, and have a thin paint film and ordinary corrosion resistance; common PVDF coil finishes also typically have a PVDF resin content of only 70%, and some may have a PVDF resin content of only 60% or 50%, or even lower. After the pigment filler is added into the paint, the paint film has low gloss due to low bearing capacity of the pigment. The coating has excellent outdoor weather resistance, but has relatively low corrosion resistance, and particularly has low applicability when meeting severe environments, such as high-corrosion environments of seashores, chemical plants, farms and the like, and needs to be sprayed with heavy-duty anticorrosive coatings with high film thickness to reduce corrosion of the environment to steel. Therefore, the development of the high-corrosion-resistance pre-coating coil coating is necessary, the production efficiency is improved, the production and use cost is reduced, and meanwhile, the coil production line has better environmental protection property compared with the outdoor spraying heavy-corrosion-resistance coating due to the recycling of waste gas.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the color plate coil coating which has high gloss of a paint film, excellent outdoor weather resistance and high corrosion resistance in a severe corrosive environment.
In order to achieve the aim, the high-corrosion-resistance color plate coil coating designed by the invention consists of a primer and a finish, wherein the thickness of the primer is 10-15 mu m, and the thickness of the finish is 18-20 mu m;
the primer consists of the following components in parts by weight:
the polyester resin is obtained by the following method: in a reactor equipped with a stirrer, a condenser and a heater, (30-40) g of hexahydrophthalic anhydride, (5-12) g of adipic acid, (3-10) g of 1, 4-cyclohexanedimethanol, (15-25) g of neopentyl glycol, (3-5) g of trimethylolpropane, (0.03-0.12) g of dibutyltin dilaurate, and (0.04-0.10) g of triphenyl phosphite are weighed; after the addition is finished, heating to 160 ℃, preserving heat for 1 hour, then heating to 180 ℃, preserving heat for 1 hour, then heating to 200 ℃, preserving heat until the material is transparent, adding (1.5-2.5) g of reflux dimethylbenzene, preserving heat at 230 ℃ of (220-230 ℃), carrying out esterification reaction, cooling to 200 ℃ when the measured acid value is lower than 6mgKOH/g, and weighing (25-30) g of 100 aromatic solvent, (5-10) g of propylene glycol methyl ether acetate, and (5-10) g of propylene glycol methyl ether for dilution; the obtained polyester resin has the solid content of (55 +/-2)%, the viscosity of (78-98) KU, the acid value of (1-5) mgKOH/g and the hydroxyl content of (0.3-0.9)%;
the finish paint comprises the following components in parts by weight:
preferably, the amino resin in the primer is one of melamine formaldehyde resin with highly etherified methanol and high imino group highly etherified amino resin.
Preferably, the blocked curing agent in the primer is one of an aliphatic HDI blocked curing agent and an aromatic TDI blocked curing agent.
Preferably, the pigment in the primer is phthalocyanine blue, titanium dioxide, carbon black, iron oxide red, DPP red and the like.
Preferably, the filler in the primer is precipitated barium sulfate.
Preferably, the dispersant in the primer is a high molecular weight block copolymer solution having pigment affinity groups, such as BYK-163, BYK-LP N23157, and the like. The pigment reflocculation is prevented by steric stabilization, thus stabilizing the tinctorial strength and hue of the pigment in paints and pigment pastes. Improved pigment wetting, reduced time required for the milling process and improved gloss and leveling, and reduced viscosity.
Preferably, the leveling agent in the primer is a fluorine modified acrylate solution. The wetting ability to the substrate is improved by reducing the surface tension of the coating, and the coating has good shrinkage cavity prevention performance and good recoatability.
Preferably, the defoamer in the primer is a polyacrylate solution. Prevents foam formation and accelerates foam collapse during solvent-borne coating production, loading and application, has no adverse effect on interlayer adhesion during recoating, and functions as a shrinkage cavity prevention and leveling aid.
Preferably, the catalyst in the primer is one or more of p-toluenesulfonic acid, dodecylbenzene sulfonic acid, dinonylnaphthalene sulfonic acid and dinonyldinaphthalenesulfonic acid. Under the conditions of crosslinking and curing, the acid catalyst rapidly releases acidity, thereby promoting the crosslinking reaction of the amino resin and the modified polyester resin.
Preferably, the solvent in the primer is a mixed solvent of two or three of aromatic hydrocarbon No. 100, xylene, propylene glycol methyl ether and propylene glycol methyl ether acetate.
Preferably, the PVDF resin in the finish paint is commercially available coating-grade PVDF powder.
Preferably, the acrylic resin in the finish paint is thermosetting acrylic resin, the solid content is (50 +/-2)%, and the acid value (to solid) is (15-22) mgKOH/g.
Preferably, the amino resin in the finish paint is one of melamine formaldehyde resin with highly etherified methanol and high imino group highly etherified amino resin.
Preferably, the leveling agent in the finish paint is a fluorine modified acrylate solution.
Preferably, the solvent in the finish paint is isophorone.
Preferably, the catalyst in the finish paint is one or more of p-toluenesulfonic acid, dodecylbenzene sulfonic acid, dinonylnaphthalene sulfonic acid and dinonyldinaphthalenesulfonic acid.
Preferably, the nano auxiliary agent in the finish paint is one or a mixture of nano zinc oxide particle dispersoid and nano cerium oxide particle dispersoid, has a wide ultraviolet absorption spectrum range, improves the long-term ultraviolet stability of the coating and the bottom layer, prevents discoloration and degradation, and does not influence the gloss of the paint film.
Preferably, the ultraviolet absorber in the finish paint is a hydroxyl triazine derivative and hindered amine which are matched according to the mass ratio of 1: 1. The hydroxy triazine derivative has no cross reaction with other components in the system, has strong adaptability, can obviously improve the performance of the hydroxy triazine derivative when being matched with hindered amine, and has good inhibiting effect on the reduction of the gloss of varnish, the generation of cracks, bubbles, delamination and discoloration.
The high-corrosion-resistance color plate coil coating is prepared by the following method:
1. preparing a primer: putting 50-70 parts of polyester resin, 2-7 parts of solvent, 0.3-1 part of dispersant, 0.2-1 part of flatting agent and 0.2-1 part of defoaming agent into a dispersion kettle; stirring and dispersing, then adding 3-25 parts of pigment and 0-5 parts of filler, uniformly dispersing, then grinding and dispersing until the fineness reaches less than or equal to 25 mu m, then adding 9-15 parts of closed curing agent, (1-4.5) parts of amino resin and (0.1-0.5) part of catalyst, and adjusting the viscosity to 120-150 s (coating-4) by using the rest (1-5) parts of solvent to obtain the coating;
2. preparing a finish paint: putting (20-30) parts of solvent into a dispersion kettle, and then slowly putting (46-51) parts of PVDF resin; after the PVDF resin is completely dissolved, adding (11-14) parts of acrylic resin, (2-4) parts of amino resin, (0.2-1) part of flatting agent, (0.2-0.6) part of catalyst, (1-4) parts of nano assistant and (1-3) parts of ultraviolet absorbent, and adjusting the viscosity to 120-150 s (coating-4) by using the rest (2-12) parts of solvent to obtain the product.
The invention adopts a use mode of combining the high weather-resistant polyester primer and the PVDF finish paint to solve the problems in practice. The preparation method comprises the following steps of (1) synthesizing high-molecular high-weather-resistance polyester resin with a small amount of branching degree by adopting hexahydrophthalic anhydride, cyclohexane dimethanol, adipic acid, neopentyl glycol and the like according to a reasonable process and a proper proportion, and adding an enclosed curing agent, amino resin and pigment filler to prepare a primer; the primer plays a role in covering and providing rich colors, and has good adhesion, toughness and durability. The finish paint is prepared from PVDF/acrylic resin paint, wherein the content ratio of PVDF resin is more than 80%, so that the coating film has better flexibility, acid and alkali resistance, corrosion resistance, weather resistance and the like compared with the conventional fluorocarbon paint. By adding the nano material and the ultraviolet absorbent, the coating has greater absorption to most of ultraviolet rays, and the aging resistance of the coating is improved; the nano-additive can also effectively prevent aging such as discoloration of the primer. The coating system can adapt to the coating of continuous production of coil coating, and the prepared color-coated sheet has good processing performance, good outdoor aging resistance and excellent corrosion resistance, and can be widely applied to severe environments such as seasides, chemical plants, farms and the like.
The high-corrosion-resistance color plate coil coating developed by the invention has the following beneficial effects:
1. the primer is prepared from high weather-resistant polyester resin, a closed curing agent, amino resin and pigment and filler, and has excellent covering power, adhesive force, toughness and durability.
2. The proportion of PVDF resin in the finish paint is more than 80%, so that the coating has better flexibility compared with the conventional fluorocarbon coating, and the T bend can reach 1T. Meanwhile, the spliced resin thermoplastic acrylic resin is changed into thermosetting acrylic resin, and the fully methylated amino resin is added, so that the crosslinking density of the paint film is improved, the hardness and the solvent resistance (MEK) wiping of the paint film are greatly improved, and the corrosion resistance is improved. The addition of the nano material and the ultraviolet absorber improves the weather resistance of the coating system.
3. The coating obtained by combining the primer and the finish paint has the advantages of the primer and the finish paint, and solves the problems that some coil coatings are short in service time in a severe corrosion environment and cannot be used in an acid-base environment.
Detailed Description
Example 1: polyester resin
Preparing a polyester resin by the following method: 300kg of hexahydrophthalic anhydride, 51kg of adipic acid, 67.5kg of 1, 4-cyclohexanedimethanol, 1484.5kg of neopentyl glycol, 11.8kg of trimethylolpropane, 0.6kg of dibutyltin dilaurate and 0.5kg of triphenyl phosphite are weighed into a reactor equipped with a stirrer, a condenser and a heater; after the addition, heating to 160 ℃, preserving heat for 1 hour, then heating to 180 ℃, preserving heat for 1 hour, then heating to 200 ℃, preserving heat until the material is transparent, adding 20kg of reflux dimethylbenzene, preserving heat at 230 ℃ for esterification reaction, cooling to 200 ℃ when the measured acid value is lower than 6mgKOH/g, and weighing 280kg of No. 100 aromatic solvent, 90kg of propylene glycol methyl ether acetate and 90kg of propylene glycol methyl ether for dilution; the resulting polyester resin had a solid content of 56.8%, a viscosity of 86KU, an acid value of 2.6mgKOH/g, and a hydroxyl group content of 0.76%.
Example 2: high-corrosion-resistance color plate coil coating
Preparing a primer: 50 kg of the polyester resin prepared in example 1, 1.5 kg of aromatic hydrocarbon No. 100, 1.5 kg of xylene, 0.3 kg of dispersant BYK-163, 0.2 kg of fluorine modified acrylate leveling agent and 0.2 kg of polyacrylate defoaming agent are put into a dispersion kettle; stirring and dispersing, adding 9.5 kg of titanium dioxide, 0.3 kg of phthalocyanine blue, 0.2 kg of carbon black and 1kg of precipitated barium sulfate, uniformly dispersing, grinding and dispersing until the fineness is less than or equal to 25 mu m, adding 9 kg of aliphatic HDI (hexamethylene diisocyanate) enclosed curing agent, 1kg of melamine formaldehyde resin highly etherified with methanol and 0.1 kg of p-toluenesulfonic acid, and adjusting the viscosity to 128s (coating-4) by using the rest 2.5 kg of xylene and 2.5 kg of No. 100 aromatic hydrocarbon.
Preparing a finish paint: 15 kg of isophorone is put into a dispersion kettle, and then 46 kg of coating-grade PVDF powder is slowly put into the dispersion kettle; after the PVDF powder is completely dissolved, 11 kg of thermosetting acrylic resin, 2 kg of melamine formaldehyde resin with highly etherified methanol, 0.2 kg of fluorine modified acrylate leveling agent, 0.3 kg of p-toluenesulfonic acid catalyst, 1kg of nano zinc oxide particle dispersion and 1kg of ultraviolet absorber (hydroxy triazine derivative and hindered amine are used in a ratio of 1: 1) are added, and the viscosity is adjusted to 130s (coating-4) by the remaining 9 kg of isophorone.
Construction: the substrate is a hot dip galvanized steel plate for a color-coated plate, an RDS12 # wire bar is selected for blade coating of a primer, and the substrate is placed in a 225 ℃ oven to be baked for 35 s; after cooling, the coating was coated with a topcoat using an RDS18 wire rod, baked in an oven at 255 ℃ for 40s, and cooled to obtain a sample plate with a dry film thickness of 30 μm.
Example 3: high-corrosion-resistance color plate coil coating
Preparing a primer: 55 kg of the polyester resin prepared in example 1, 4 kg of xylene, 1kg of propylene glycol methyl ether acetate, 0.4 kg of a dispersant BYK-163, 0.3 kg of a fluorine modified acrylate leveling agent and 0.3 kg of a polyacrylate defoaming agent are put into a dispersion kettle; stirring and dispersing, adding 14 kg of titanium dioxide, 1kg of iron oxide red and 1.5 kg of precipitated barium sulfate, uniformly dispersing, grinding and dispersing until the fineness reaches less than or equal to 25 mu m, adding 10 kg of aromatic TDI (toluene diisocyanate) enclosed curing agent, 1.5 kg of high imino high methylated amino resin and 0.15 kg of dodecylbenzene sulfonic acid, and adjusting the viscosity to 127s (coating-4) by using the rest 1.6 kg of xylene and 0.4 kg of propylene glycol methyl ether acetate.
Preparing a finish paint: 16 kg of isophorone is put into a dispersion kettle, and then 47 kg of coating-grade PVDF powder is slowly put into the dispersion kettle; after the PVDF powder is completely dissolved, 11.5 kg of thermosetting acrylic resin, 2.5 kg of high imino methylated amino resin, 0.25 kg of fluorine modified acrylate leveling agent, 0.3 part of dodecylbenzene sulfonic acid, 2 kg of nano zinc oxide particle dispersoid and 1kg of ultraviolet absorber (hydroxy triazine derivative and hindered amine are used in a ratio of 1: 1) are added, and the residual 10 kg of isophorone is used for adjusting the viscosity to 132s (coating-4).
Construction: the substrate is a hot dip galvanized steel plate for a color-coated plate, an RDS12 # wire bar is selected for blade coating of a primer, and the substrate is placed in a 225 ℃ oven to be baked for 35 s; after cooling, the coating was coated with a topcoat using an RDS18 wire rod, baked in an oven at 255 ℃ for 40s, and cooled to obtain a sample plate with a dry film thickness of 30 μm.
Example 4: high-corrosion-resistance color plate coil coating
Preparing a primer: 60 kg of the polyester resin prepared in example 1, 1kg of No. 100 aromatic hydrocarbon, 4 kg of xylene, 0.5kg of propylene glycol methyl ether, 0.5kg of a dispersing agent BYK-163, 0.6kg of a fluorine modified acrylate leveling agent and 0.7 kg of a polyacrylate defoaming agent are put into a dispersion kettle; stirring and dispersing, then adding 0.3 kg of phthalocyanine blue, 5.7 kg of titanium dioxide and 1kg of precipitated barium sulfate, uniformly dispersing, then grinding and dispersing until the fineness reaches less than or equal to 25 mu m, then adding 12 kg of aromatic TDI (toluene diisocyanate) blocked curing agent, 4 kg of high imino high methylated amino resin and 0.3 kg of dinonyl dinaphthalene sulfonic acid, and adjusting the viscosity to 130s (coating-4) by using the rest 3.2 kg of dimethylbenzene, 1.9 kg of No. 100 aromatic hydrocarbon and 0.4 kg of propylene glycol methyl ether.
Preparing a finish paint: 25 kg of isophorone is put into a dispersion kettle, and then 50 kg of coating-grade PVDF powder is slowly put into the dispersion kettle; after PVDF powder is completely dissolved, 12 kg of thermosetting acrylic resin, 3 kg of melamine formaldehyde resin with highly etherified methanol, 1kg of fluorine modified acrylate leveling agent, 0.4 kg of p-toluenesulfonic acid, 0.2 kg of dodecylbenzenesulfonic acid, 4 kg of nano cerium oxide particle dispersoid and 2 kg of ultraviolet absorber (hydroxy triazine derivative and hindered amine 1:1 are used in a matching way) are added, and the viscosity is adjusted to 134s (coating-4) by the remaining 5kg of isophorone.
Construction: the substrate is a hot dip galvanized steel plate for a color-coated plate, an RDS12 # wire bar is selected for blade coating of a primer, and the substrate is placed in a 225 ℃ oven to be baked for 35 s; after cooling, the coating was coated with a topcoat using an RDS18 wire rod, baked in an oven at 255 ℃ for 40s, and cooled to obtain a sample plate with a dry film thickness of 30 μm.
Example 5: high-corrosion-resistance color plate coil coating
Preparing a primer: 65 kg of the polyester resin prepared in example 1, 3 kg of propylene glycol methyl ether acetate, 0.55 kg of a dispersant BYK-LP N23157, 0.7 kg of a fluorine modified acrylate leveling agent and 0.75 kg of a polyacrylate defoaming agent are put into a dispersing kettle; stirring and dispersing, then adding 1kg of phthalocyanine blue, 15 kg of titanium dioxide, 2 kg of carbon black, 6kg of iron oxide red and 5kg of precipitated barium sulfate, uniformly dispersing, grinding and dispersing until the fineness is less than or equal to 25 mu m, then adding 13 kg of aliphatic HDI blocked curing agent, 4.5kg of high imino high methyl etherified amino resin, 0.3 kg of dinonyl naphthalene sulfonic acid and 0.05 kg of dinonyl dinaphthyl sulfonic acid, and adjusting the viscosity to 130s (coating-4) by using the rest 2.5 kg of propylene glycol methyl ether and 2.5 kg of propylene glycol methyl ether acetate.
Preparing a finish paint: 26 kg of isophorone is put into a dispersion kettle, and then 51kg of coating-grade PVDF powder is slowly put into the dispersion kettle; after the PVDF powder is completely dissolved, 12 kg of thermosetting acrylic resin, 2 kg of high imino methylated amino resin, 1kg of fluorine modified acrylate leveling agent, 0.4 kg of p-toluenesulfonic acid, 1kg of nano zinc oxide particle dispersoid, 2 kg of nano cerium oxide particle dispersoid and 2.5 kg of ultraviolet absorber (hydroxy triazine derivative and hindered amine are used in a ratio of 1: 1) are added, and the viscosity is adjusted to 128s (coating-4) by using the remaining 5kg of isophorone.
Construction: the substrate is a hot dip galvanized steel plate for a color-coated plate, an RDS12 # wire bar is selected for blade coating of a primer, and the substrate is placed in a 225 ℃ oven to be baked for 35 s; after cooling, the coating was coated with a topcoat using an RDS18 wire rod, baked in an oven at 255 ℃ for 40s, and cooled to obtain a sample plate with a dry film thickness of 30 μm.
Example 6: high-corrosion-resistance color plate coil coating
Preparing a primer: 55 kg of the polyester resin prepared in example 1, 4 kg of xylene, 1kg of propylene glycol methyl ether acetate, 0.4 kg of a dispersant BYK-LP N23157, 0.35 kg of a fluorine modified acrylic acid leveling agent and 0.4 kg of a polyacrylate defoaming agent are put into a dispersion kettle; stirring and dispersing, then adding 5kg of titanium dioxide and 0.5kg of precipitated barium sulfate, uniformly dispersing, then grinding and dispersing until the fineness reaches less than or equal to 25 mu m, then adding 10 kg of aliphatic HDI (hexamethylene diisocyanate) enclosed curing agent, 2.5 kg of high imino high methylated amino resin, 0.2 kg of p-toluenesulfonic acid and 0.15 kg of dinonylnaphthalene sulfonic acid, and adjusting the viscosity to 133s (coating-4) by using the rest 1kg of xylene, 0.5kg of propylene glycol methyl ether and 0.5kg of propylene glycol methyl ether acetate.
Preparing a finish paint: adding 17 kg of isophorone into a dispersion kettle, and slowly adding 50 kg of coating-grade PVDF powder; after the PVDF powder is completely dissolved, 11 kg of thermosetting acrylic resin, 3 kg of melamine formaldehyde resin with highly etherified methanol, 0.6kg of fluorine modified acrylate leveling agent, 0.5kg of p-toluenesulfonic acid, 1kg of nano cerium oxide particle dispersion and 3 kg of ultraviolet absorber (hydroxy triazine derivative and hindered amine are used in a ratio of 1: 1) are added, and the viscosity is adjusted to 130s (coating-4) by using the remaining 8kg of isophorone.
Construction: the substrate is a hot dip galvanized steel plate for a color-coated plate, an RDS12 # wire bar is selected for blade coating of a primer, and the substrate is placed in a 225 ℃ oven to be baked for 35 s; after cooling, the coating was coated with a topcoat using an RDS18 wire rod, baked in an oven at 255 ℃ for 40s, and cooled to obtain a sample plate with a dry film thickness of 30 μm.
The high-corrosion-resistance coil coating obtained in the above examples 2 to 6 is subjected to performance test, and the result is as follows:
Claims (11)
1. the high-corrosion-resistance color plate coil coating is characterized in that: the paint consists of a primer and a finish, wherein the thickness of the primer is 10-15 mu m, and the thickness of the finish is 18-20 mu m;
the primer consists of the following components in parts by weight:
the polyester resin is obtained by the following method: in a reactor equipped with a stirrer, a condenser and a heater, 30 to 40g of hexahydrophthalic anhydride, 5 to 12g of adipic acid, 3 to 10g of 1, 4-cyclohexanedimethanol, 15 to 25g of neopentyl glycol, 3 to 5g of trimethylolpropane, 0.03 to 0.12g of dibutyltin dilaurate, 0.04 to 0.10g of triphenyl phosphite are weighed; after the addition is finished, heating to 160 ℃, preserving heat for 1 hour, then heating to 180 ℃, preserving heat for 1 hour, then heating to 200 ℃, preserving heat until the material is transparent, adding 1.5-2.5g of reflux dimethylbenzene, preserving heat at 230 ℃ in 220-230 ℃, carrying out esterification reaction, cooling to 200 ℃ when the measured acid value is lower than 6mgKOH/g, weighing 25-30g of 100 # aromatic solvent, 5-10g of propylene glycol methyl ether acetate and 5-10g of propylene glycol methyl ether, and diluting; the obtained polyester resin has a solid content of 55 +/-2%, a viscosity of 78-98KU, an acid value of 1-5mgKOH/g and a hydroxyl content of 0.3-0.9%;
the finish paint comprises the following components in parts by weight:
the nano auxiliary agent in the finish paint is one or a mixture of nano zinc oxide particle dispersoid and nano cerium oxide particle dispersoid.
2. The high-corrosion-resistance color plate coil coating as claimed in claim 1, wherein: the amino resin in the primer is melamine formaldehyde resin with highly etherified methanol.
3. The high-corrosion-resistance color plate coil coating as claimed in claim 1, wherein: the amino resin in the primer is high imino high methyl etherified amino resin.
4. The high-corrosion-resistance color plate coil coating as claimed in claim 1, wherein: the blocked curing agent in the primer is one of aliphatic HDI blocked curing agent and aromatic TDI blocked curing agent.
5. The high-corrosion-resistance color plate coil coating as claimed in claim 1, wherein: the dispersant in the primer is a high molecular weight block copolymer solution having pigment affinity groups.
6. The high-corrosion-resistance color plate coil coating as claimed in claim 1, wherein: the leveling agent in the primer is a fluorine modified acrylate solution, and the defoaming agent in the primer is a polyacrylate solution.
7. The high-corrosion-resistance color plate coil coating as claimed in claim 1, wherein: the catalyst in the primer is one or more of p-toluenesulfonic acid, dodecylbenzene sulfonic acid, dinonylnaphthalene sulfonic acid and dinonylnaphthalene disulfonic acid.
8. The high-corrosion-resistance color plate coil coating as claimed in claim 1, wherein: the acrylic resin in the finish paint is thermosetting acrylic resin, the solid content is 50 +/-2%, and the acid value of the solid is 15-22 mgKOH/g.
9. The high-corrosion-resistance color plate coil coating as claimed in claim 1, wherein: the amino resin in the finish paint is melamine formaldehyde resin with highly etherified methanol.
10. The high-corrosion-resistance color plate coil coating as claimed in claim 1, wherein: the amino resin in the finish paint is high imino high methylated amino resin.
11. The high-corrosion-resistance color plate coil coating as claimed in claim 1, wherein: the ultraviolet absorber in the finish paint is used by matching hydroxy triazine derivative and hindered amine according to the mass ratio of 1: 1.
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