CN109468029B - Water-based coil steel coating finish paint and preparation method thereof - Google Patents
Water-based coil steel coating finish paint and preparation method thereof Download PDFInfo
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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
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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
- 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
- C09D7/60—Additives non-macromolecular
- C09D7/63—Additives non-macromolecular organic
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- 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
- C09D7/65—Additives macromolecular
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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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- 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
- C08K3/32—Phosphorus-containing compounds
- C08K2003/321—Phosphates
- C08K2003/327—Aluminium phosphate
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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
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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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
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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Abstract
The invention relates to the field of water-based paint, and particularly discloses water-based coil steel paint finish paint and a preparation method thereof, wherein the water-based coil steel paint finish paint comprises the following components: the antirust paint comprises water-based polyester resin, antirust slurry, amino resin, an acid catalyst, a wetting agent, a flatting agent, a defoaming agent, an adhesion promoter, a wetting dispersant, an anti-settling agent, a pH regulator, a cosolvent and water. The coil steel coating finish paint provided by the invention is a water-based product, has ultralow VOC (volatile organic compound), causes little pollution to the environment, greatly improves T-bend performance, does not crack in T-bend in winter, does not adhere reversely in summer, and can achieve physical and mechanical properties equivalent to those of solvent-based coatings.
Description
Technical Field
The invention relates to the field of water-based paint, in particular to water-based coil steel paint finish paint and a preparation method thereof.
Background
The coil coating comprises coil steel coating and coil aluminum coating, and is prepared by coating the coating on the surfaces of a steel plate and an aluminum plate by a roller coating operation method to prepare a precoated coil. The coil coating is composed of base material, cross-linking agent, pigment and filler, assistant and volatile component, and can be divided into priming paint, back paint and finish paint according to the application. The aluminum material only needs a single coating, and the galvanized steel and the cold rolled steel need a primer and a finish.
At present, the coil coating is still dominated by the solvent-based coating, but the solvent-based coil coating contains a large amount of organic solvent, the volatilization of the organic solvent causes environmental pollution, the body health of production operators and construction operators is seriously influenced, and the social consensus is established. Under the environment that the environmental protection policy is stricter, the water-based coil coating is produced at the same time, and the water-based coil coating becomes a trend in the future. However, the water-based coil steel coating on the market at present is difficult to achieve the comprehensive performances such as hardness, T bend, weather resistance and the like required by a solvent-based coil steel coating, and the development of the water-based coil steel coating is greatly restricted.
Disclosure of Invention
In order to overcome the technical defects in the prior art, the invention provides the water-based coil steel coating finish paint with small T bend and good weather resistance, and also provides the preparation method thereof.
In order to realize the purpose of the invention, the following technical scheme is adopted for realizing the purpose:
a water-based coil steel coating finish paint comprises the following components: the antirust paint comprises water-based polyester resin, antirust slurry, amino resin, an acid catalyst, a wetting agent, a flatting agent, a defoaming agent, an adhesion promoter, a wetting dispersant, an anti-settling agent, a pH regulator, a cosolvent and water.
As a preferable scheme, the water-based coil steel coating finish paint comprises the following components in parts by weight:
20-40 parts of water-based polyester resin;
30-50 parts of antirust slurry;
1-10 parts of amino resin;
0.1-2 parts of an acid catalyst;
0.2-1 part of a wetting agent;
0.1-1 part of a leveling agent;
0.1-2 parts of a defoaming agent;
0.2-5 parts of an adhesion promoter;
0.3-10 parts of wetting dispersant;
1-5 parts of an anti-settling agent;
0.1-0.5 part of pH regulator;
4-23 parts of a cosolvent;
5-20 parts of water.
Preferably, the antirust sizing agent contains more pigments and fillers, so that the surface performance of the water-based coil coating finish paint is improved by improving the dispersion effect of the pigments and fillers in the coating. Specifically, the antirust slurry is prepared from the following components in parts by weight: 20-30 parts of water-based polyester resin; 2-5 parts of zinc phosphate; 4-10 parts of aluminum tripolyphosphate; 2-6 parts of talcum powder; 30-50 parts of titanium dioxide; 4-6 parts of ferrotitanium powder; 10-20 parts of water; 2-8 parts of ethylene glycol monobutyl ether; 1-5 parts of n-butyl alcohol; 2-8 parts of a wetting dispersant; 0.05-0.5 part of defoaming agent; 0.1-0.5 part of pH regulator.
Further preferably, the antirust slurry is prepared from the following components in parts by weight: 22 parts of water-based polyester resin; 2 parts of zinc phosphate; 5 parts of aluminum tripolyphosphate; 3 parts of talcum powder; 34.7 parts of titanium dioxide; 5 parts of ferrotitanium powder; 15 parts of water; 5 parts of ethylene glycol monobutyl ether; 3 parts of n-butyl alcohol; 5 parts of wetting dispersant; 0.2 part of defoaming agent; 0.1 part of pH regulator.
Aqueous polyester resins are broadly defined as relatively low molecular weight, amorphous oligomers of generally linear or branched type having a number average relative molecular mass of generally 10, synthesized by polyesterification of a polyhydric alcohol and a polybasic acid2~104They can be classified into saturated polyesters and unsaturated polyesters according to their structures and saturations. Preferably, the molecular weight of the water-based polyester resin is 3000-7000, the hydroxyl value is 10-60 mg KOH/g, and the acid value is 15-75 mg KOH/g.
The amino resin is at least one of fully methylated amino resin, partially methylated amino resin, butylated amino resin and methyl butyl mixed etherified amino resin.
The acid catalyst is one or a combination of dodecyl benzene sulfonic acid, isooctanoic acid and p-toluenesulfonic acid.
The wetting agent is any one or mixture of polyether siloxane, polyether modified dimethyl siloxane, polyester modified polysiloxane, polyvinyl alcohol, acrylate and aldehyde ketone resin.
The leveling agent is any one or a mixture of polyether siloxane, polyether modified dimethyl siloxane, polyester modified polysiloxane, polyvinyl alcohol, acrylate and aldehyde ketone resin.
The anti-settling agent is one or a mixture of more of polyamide wax, organic bentonite, castor oil derivatives, fumed silica, polyolefin wax and modified hydrogenated castor oil.
The defoaming agent is any one or mixture of more of organic siloxane, polydimethylsiloxane, polyether siloxane, amide defoaming agent, dimethyl silicone oil, n-butyl alcohol, polypropylene alcohol, tributyl phosphate, ethylene oxide, magnesium hydroxide, polyethylene wax, phosphate ester and mineral oil.
The adhesion promoter is any one or combination of a plurality of resin adhesion promoters, silane coupling agents and titanate coupling agents.
The wetting dispersant is one or more of anionic wetting dispersant, cationic wetting dispersant, non-ionic wetting dispersant, amphoteric wetting dispersant, electric neutral wetting dispersant, polymer type hyperdispersant and controlled free radical type hyperdispersant.
The pH regulator is dimethylethanolamine.
According to the invention, by reasonably matching the water-based polyester resin, the amino resin and the catalyst, the flexibility of the coil coating is greatly improved, the difficult problem that the flexibility of the industrial inner coil steel coating is poor or only just reaches the standard is solved, the T-bend performance is greatly improved, the T-bend does not crack in winter, the anti-adhesion is not generated in summer, and the physical and mechanical properties equivalent to those of a solvent-based coating can be achieved.
Meanwhile, the amino resin and the catalyst are reasonably matched, so that the amino resin with high activity is selected to quickly and completely cure the resin on one hand, and the proper catalyst is selected to reduce the activation energy required by the reaction between the amino resin and the catalyst on the other hand, thereby reducing the curing temperature, improving the curing speed and shortening the time. The PMT (substrate peak temperature) of the existing common coil coating is generally 216 ℃ or above, and the coil steel coating provided by the invention can be cured to form a film at 150 ℃ or even lower temperature, so that good physical and mechanical properties are achieved. As a preferred embodiment, the cosolvent is specifically: 1-10 parts of ethylene glycol monobutyl ether; 1-5 parts of n-butyl alcohol; 2-8 parts of ethanol.
As a preferable scheme, the light-absorbing material further comprises 0.5-3 parts of matting powder.
The preparation method of the water-based coil steel coating finish paint specifically comprises the following steps:
(1) weighing the water-based polyester resin according to a formula, putting the water-based polyester resin into a stirring kettle, then putting the antirust slurry according to the formula amount, starting stirring, and controlling the rotating speed to be 600-800 r/min;
(2) uniformly mixing the cosolvent and the acid catalyst which are weighed according to the weight parts of the formula, putting the mixture into a stirring kettle, and continuously stirring;
(3) sequentially adding amino resin, a wetting agent, a flatting agent, a defoaming agent, an adhesion promoter, a wetting dispersant and an anti-settling agent which are weighed according to the weight parts of the formula, and stirring at a medium speed, wherein the rotating speed is controlled to be 1200-1500 rpm and lasts for 15-20 minutes;
(4) adding water weighed according to the weight part of the formula, and continuously dispersing for 20 minutes;
(5) and adding a pH regulator weighed according to the weight part of the formula, regulating the pH value to 8.5-9.5, and continuously stirring for 10 minutes.
Preferably, the preparation method of the antirust slurry specifically comprises the following steps: weighing water-based polyester resin, zinc phosphate, aluminum tripolyphosphate, talcum powder, titanium dioxide, titanium iron powder, water, ethylene glycol monobutyl ether, n-butyl alcohol, a wetting dispersant, a defoaming agent and a pH regulator according to parts by weight, putting into mixing equipment, stirring at a rotating speed of 400-800 rpm for 10-20 minutes to obtain prefabricated mixed slurry, and grinding the prefabricated mixed slurry to be below 15 mu m to obtain the antirust slurry.
Preferably, the extinction powder weighed according to the weight part of the formula is also added in the step (3). Compared with the prior art, the invention provides the water-based coil steel coating finish paint and the preparation method thereof, and the water-based coil steel coating finish paint has the following beneficial effects:
(1) the coil steel coating finish paint provided by the invention is a water-based product, has ultralow VOC (volatile organic compound) and small environmental pollution, and the product takes water as a solvent, so that a production line can not generate a large amount of solvent smoke any more, and the production environment is greatly improved.
(2) The invention solves the difficult problem that the flexibility of the inner coil steel coating in the industry is poor or only reaches the standard just, the T-bend performance is greatly improved, the T-bend does not crack in winter, the T-bend does not reverse stick in summer, and the physical and mechanical properties equivalent to those of solvent-based coatings can be achieved.
(3) The PMT (substrate peak temperature) of the existing common coil coating is generally 216 ℃ or above, and the invention can be cured to form a film at 150 ℃ or even lower temperature, thereby achieving good physical and mechanical properties. The coil steel coating provided by the invention has a low-temperature curing effect, and is energy-saving and emission-reducing; and the curing speed is high, the curing temperature is relatively low, the energy is saved, and the performance of the cured product is good.
(4) The cured paint film disclosed by the invention is excellent in adhesive force, high in curing speed, high in gloss, good in fullness, good in gloss and color retention, good in yellowing resistance and excellent in impact resistance.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention are described in further detail below.
Example 1
The water-based coil steel coating finish paint comprises the following components in parts by mass: 20 parts of water-based polyester resin, 50 parts of antirust slurry, 7 parts of amino resin, 0.1 part of acid catalyst, 0.25 part of wetting agent, 0.2 part of flatting agent, 0.15 part of defoaming agent, 2 parts of adhesion promoter, 0.3 part of wetting dispersant, 3 parts of ethylene glycol monobutyl ether, 2.2 parts of n-butyl alcohol, 5 parts of ethanol, 2 parts of anti-settling agent, 1.5 parts of matting powder, 6 parts of deionized water and 0.3 part of pH regulator.
Wherein, the antirust sizing agent comprises the following components in parts by weight: 22 parts of water-based polyester resin, 2 parts of zinc phosphate, 5 parts of aluminum tripolyphosphate, 3 parts of talcum powder, 34.7 parts of titanium dioxide, 5 parts of ferrotitanium powder, 15 parts of deionized water, 5 parts of ethylene glycol monobutyl ether, 3 parts of n-butyl alcohol, 5 parts of wetting dispersant, 0.2 part of defoaming agent and 0.1 part of pH regulator.
In this example, the waterborne polyester resin is HOMAPE4200-80 waterborne modified polyester polymer available from GOLD CHEMICAL CO.
The amino resin is partially methylated amino resin or semi-methylated amino resin, such as CYMEL325, Vinca MR625, Korean Mexican amino resin 03, 21, 25, etc.
The acid catalyst is NACURE2500 of the King chemical industry in America or a closed acid catalyst P-TSA.
The wetting agent is a polyether-siloxane copolymer from digo 270.
The leveling agent is polyether siloxane, so that the surface tension of the coating is obviously reduced, the substrate wetting capacity of the coating and the flowability of a paint film are improved, and Benard vortexes are eliminated so as to prevent the floating. Contribute to improving the smoothness, scratch resistance and blocking resistance of the coating.
The defoaming agent is Germany Digao Tego-810, which is a polyether siloxane copolymer containing fumed silica.
The adhesion promoter is 2802 water-based epoxy phosphate baking varnish adhesion promoter of Shenzhen Shanghai chemical Limited.
The wetting dispersant is a macromolecular hyperdispersant, and the macromolecular dispersant is also classified into a polyhexamethylene polyol-polyethyleneimine block copolymer dispersant, an acrylate macromolecular dispersant, polyurethane, macromolecular polyether or polyester macromolecular dispersant and the like. One end of the anchoring group is coated with pigment particles, and the other end is wound and adsorbed with resin, so that the paint has the advantages of good storage stability, good color development, excellent anti-settling property, prevention of flooding and floating and stable performance. In this example, BYK-190 from Bick chemical, Germany was used as the wetting and dispersing agent, and BYK-190 was a polymer copolymer containing pigment affinity groups.
The anti-settling agent is polyamide wax. The polyamide wax belongs to an organic rheological thixotropic agent, a reticular structure is formed by intertwining macromolecular chains, the thixotropic property is realized, intertwined molecules are pulled open in viscosity when being sheared, so that the viscosity is reduced, when the shearing is stopped, the macromolecules are intertwined again to cause the viscosity to rise, and the speed of recovering the viscosity is slow because the intertwined molecules are relatively slow, so that the wet film can flow and level for a long time, and the flow hanging is not out of control.
The matting powder is TYS-100 of Shanxi Tian-nanometer material science and technology limited.
The pH regulator is dimethylethanolamine.
The preparation method of the antirust slurry comprises the following specific steps: adding water-based polyester resin, zinc phosphate, aluminum tripolyphosphate, talcum powder, titanium dioxide, ferrotitanium powder, water, ethylene glycol monobutyl ether, n-butyl alcohol, a wetting dispersant, a defoaming agent and a pH regulator in parts by weight of the formula into a dispersion cylinder, stirring at a low speed (400-800 rpm) for 10-20 minutes to prepare slurry, and grinding to below 15 mu m by using a sand mill to obtain the antirust slurry. The prepared antirust slurry is ready for use.
The preparation method of the water-based coil coating finish paint comprises the following steps:
(1) and setting the addition amount of the waterborne polyester resin on a feeding control panel, starting a conveying device, and feeding the resin into the stirring kettle.
(2) Setting the addition amount of the antirust slurry on a feeding control panel, starting a conveying device, and feeding the antirust slurry; and after the antirust slurry is put into the reactor, starting stirring, and stirring at a low speed, wherein the rotating speed is controlled to be 600-800 rpm.
(3) Uniformly mixing ethylene glycol monobutyl ether, n-butyl alcohol, ethanol and an acid catalyst, then putting into a stirring kettle, and continuously stirring.
(4) And sequentially adding amino resin, a wetting agent, a flatting agent, a defoaming agent, an adhesion promoter, a dispersing agent, an anti-settling agent, matting powder and stirring at a medium speed, wherein the rotating speed is controlled at 1200-1500 rpm and lasts for 15-20 minutes.
(5) And setting the addition amount of clear water in a pipeline feeding device, starting and conveying the clear water to the stirring kettle, and continuously dispersing for 20 minutes.
(6) And adding a pH regulator, regulating the pH value to 8.5-9.5, and continuously stirring for 10 minutes.
(7) Stopping sampling, sending to a central control for detection.
(8) And after the central control detection is qualified, filtering and packaging by using a 200-mesh filter screen.
Example 2
The water-based coil steel coating finish paint comprises the following components in parts by mass: 25 parts of water-based polyester resin, 45 parts of antirust slurry, 7 parts of amino resin, 0.1 part of acid catalyst, 0.25 part of wetting agent, 0.2 part of flatting agent, 0.15 part of defoaming agent, 2 parts of adhesion promoter, 0.3 part of wetting dispersant, 3 parts of ethylene glycol monobutyl ether, 2.2 parts of n-butyl alcohol, 2 parts of ethanol, 2 parts of anti-settling agent, 1.5 parts of matting powder, 9 parts of deionized water and 0.3 part of pH regulator.
Wherein, the antirust sizing agent comprises the following components in parts by weight: 22 parts of waterborne polyester resin, 2 parts of zinc phosphate, 5 parts of aluminum tripolyphosphate, 3 parts of talcum powder, 34.7 parts of titanium dioxide, 5 parts of ferrotitanium powder, 15 parts of deionized water, 5 parts of ethylene glycol monobutyl ether, 3 parts of n-butyl alcohol, 5 parts of wetting dispersant, 0.2 part of defoaming agent and 0.1 part of pH regulator.
In this example, the aqueous polyester resin was a WP-531 aqueous modified polyester polymer produced by Kyowa synergistic Polymer Co., Ltd.
The amino resin is partially methylated amino resin or semi-methylated amino resin, such as CYMEL325, Vinca MR625, Korean Mexican amino resin 03, 21, 25, etc.
The acid catalyst is NACURE2500 of the King chemical industry in America or a closed acid catalyst P-TSA.
The wetting agent is a polyether-siloxane copolymer from digo 270.
The leveling agent is polyether siloxane, so that the surface tension of the coating is obviously reduced, the substrate wetting capacity of the coating and the flowability of a paint film are improved, and Benard vortexes are eliminated so as to prevent the floating. Contribute to improving the smoothness, scratch resistance and blocking resistance of the coating.
The defoaming agent is Germany Digao Tego-810, which is a polyether siloxane copolymer containing fumed silica.
The adhesion promoter is 2802 water-based epoxy phosphate baking varnish adhesion promoter of Shenzhen Shanghai chemical Limited.
The wetting dispersant is a macromolecular hyperdispersant, and the macromolecular dispersant is also classified into a polyhexamethylene polyol-polyethyleneimine block copolymer dispersant, an acrylate macromolecular dispersant, polyurethane, macromolecular polyether or polyester macromolecular dispersant and the like. One end of the anchoring group is coated with pigment particles, and the other end is wound and adsorbed with resin, so that the paint has the advantages of good storage stability, good color development, excellent anti-settling property, prevention of flooding and floating and stable performance. In this example, BYK-190 from Bick chemical, Germany was used as the wetting and dispersing agent, and BYK-190 was a polymer copolymer containing pigment affinity groups.
The anti-settling agent is polyamide wax. The polyamide wax belongs to an organic rheological thixotropic agent, a reticular structure is formed by intertwining macromolecular chains, the thixotropic property is realized, intertwined molecules are pulled open in viscosity when being sheared, so that the viscosity is reduced, when the shearing is stopped, the macromolecules are intertwined again to cause the viscosity to rise, and the speed of recovering the viscosity is slow because the intertwined molecules are relatively slow, so that the wet film can flow and level for a long time, and the flow hanging is not out of control.
The matting powder is TYS-100 of Shanxi Tian-nanometer material science and technology limited.
The pH regulator is dimethylethanolamine.
The preparation method of the antirust slurry comprises the following specific steps: adding water-based polyester resin, zinc phosphate, aluminum tripolyphosphate, talcum powder, titanium dioxide, ferrotitanium powder, water, ethylene glycol monobutyl ether, n-butyl alcohol, a wetting dispersant, a defoaming agent and a pH regulator in parts by weight of the formula into a dispersion cylinder, stirring at a low speed (400-800 rpm) for 10-20 minutes to prepare slurry, and grinding to below 15 mu m by using a sand mill to obtain the antirust slurry. The prepared antirust slurry is ready for use.
The preparation method of the water-based coil coating finish paint is the same as that of the example 1.
Example 3
The water-based coil steel coating finish paint comprises the following components in parts by mass: 20 parts of water-based polyester resin, 50 parts of antirust slurry, 10 parts of amino resin, 0.1 part of acid catalyst, 0.25 part of wetting agent, 0.2 part of flatting agent, 0.15 part of defoaming agent, 2 parts of adhesion promoter, 0.3 part of wetting dispersant, 3 parts of ethylene glycol monobutyl ether, 2.2 parts of n-butyl alcohol, 2 parts of ethanol, 2 parts of anti-settling agent, 1.5 parts of matting powder, 6 parts of deionized water and 0.3 part of pH regulator.
Wherein, the antirust sizing agent comprises the following components in parts by weight: 22 parts of water-based polyester resin, 2 parts of zinc phosphate, 5 parts of aluminum tripolyphosphate, 3 parts of talcum powder, 34.7 parts of titanium dioxide, 5 parts of ferrotitanium powder, 15 parts of deionized water, 5 parts of ethylene glycol monobutyl ether, 3 parts of n-butyl alcohol, 5 parts of wetting dispersant, 0.2 part of defoaming agent and 0.1 part of pH regulator.
In this example, the waterborne polyester resin is a waterborne modified polyester polymer of AK3029A, a product of Golgingande chemical Co., Ltd, Fushan.
The amino resin is partially methylated amino resin or semi-methylated amino resin, such as CYMEL325, Vinca MR625, Korean Mexican amino resin 03, 21, 25, etc.
The acid catalyst is NACURE2500 of the King chemical industry in America or a closed acid catalyst P-TSA.
The wetting agent is a polyether-siloxane copolymer from digo 270.
The leveling agent is polyether siloxane, so that the surface tension of the coating is obviously reduced, the substrate wetting capacity of the coating and the flowability of a paint film are improved, and Benard vortexes are eliminated so as to prevent the floating. Contribute to improving the smoothness, scratch resistance and blocking resistance of the coating.
The defoaming agent is Germany Digao Tego-810, which is a polyether siloxane copolymer containing fumed silica.
The adhesion promoter is 2802 water-based epoxy phosphate baking varnish adhesion promoter of Shenzhen Shanghai chemical Limited.
The wetting dispersant is a macromolecular hyperdispersant, and the macromolecular dispersant is also classified into a polyhexamethylene polyol-polyethyleneimine block copolymer dispersant, an acrylate macromolecular dispersant, polyurethane, macromolecular polyether or polyester macromolecular dispersant and the like. One end of the anchoring group is coated with pigment particles, and the other end is wound and adsorbed with resin, so that the paint has the advantages of good storage stability, good color development, excellent anti-settling property, prevention of flooding and floating and stable performance. In this example, BYK-190 from Bick chemical, Germany was used as the wetting and dispersing agent, and BYK-190 was a polymer copolymer containing pigment affinity groups.
The anti-settling agent is polyamide wax. The polyamide wax belongs to an organic rheological thixotropic agent, a reticular structure is formed by intertwining macromolecular chains, the thixotropic property is realized, intertwined molecules are pulled open in viscosity when being sheared, so that the viscosity is reduced, when the shearing is stopped, the macromolecules are intertwined again to cause the viscosity to rise, and the speed of recovering the viscosity is slow because the intertwined molecules are relatively slow, so that the wet film can flow and level for a long time, and the flow hanging is not out of control.
The matting powder is TYS-100 of Shanxi Tian-nanometer material science and technology limited.
The pH regulator is dimethylethanolamine.
The preparation method of the antirust slurry comprises the following specific steps: adding water-based polyester resin, zinc phosphate, aluminum tripolyphosphate, talcum powder, titanium dioxide, ferrotitanium powder, water, ethylene glycol monobutyl ether, n-butyl alcohol, a wetting dispersant, a defoaming agent and a pH regulator in parts by weight of the formula into a dispersion cylinder, stirring at a low speed (400-800 rpm) for 10-20 minutes to prepare slurry, and grinding to below 15 mu m by using a sand mill to obtain the antirust slurry. The prepared antirust slurry is ready for use.
The preparation method of the water-based coil coating finish paint is the same as that of the example 1.
Example 4
The water-based coil steel coating finish paint comprises the following components in parts by mass: 40 parts of water-based polyester resin, 30 parts of antirust slurry, 5 parts of amino resin, 1 part of acid catalyst, 0.7 part of wetting agent, 0.4 part of flatting agent, 0.3 part of defoaming agent, 5 parts of adhesion promoter, 7 parts of wetting dispersant, 8 parts of ethylene glycol monobutyl ether, 1 part of n-butyl alcohol, 8 parts of ethanol, 5 parts of anti-settling agent, 2.5 parts of matting powder, 15 parts of deionized water and 0.5 part of pH regulator.
Wherein, the antirust sizing agent comprises the following components in parts by weight: 20 parts of water-based polyester resin, 2 parts of zinc phosphate, 4 parts of aluminum tripolyphosphate, 2 parts of talcum powder, 30 parts of titanium dioxide, 4 parts of ferrotitanium powder, 10 parts of deionized water, 2 parts of ethylene glycol monobutyl ether, 1 part of n-butyl alcohol, 5 parts of wetting dispersant, 0.1 part of defoaming agent and 0.2 part of pH regulator.
In this example, the waterborne polyester resin is a waterborne modified polyester polymer of AK3029A, a product of Golgingande chemical Co., Ltd, Fushan.
The amino resin is partially methylated amino resin or semi-methylated amino resin, such as CYMEL325, Vinca MR625, Korean Mexican amino resin 03, 21, 25, etc.
The acid catalyst is p-toluenesulfonic acid.
The wetting agent is polyvinyl alcohol.
The leveling agent is polyester modified polysiloxane, so that the surface tension of the coating is obviously reduced, the substrate wetting capacity of the coating and the flowability of a paint film are improved, and Benard vortexes are eliminated so as to prevent the floating. Contribute to improving the smoothness, scratch resistance and blocking resistance of the coating.
The defoaming agent is mineral oil.
The adhesion promoter is titanate coupling agent.
The wetting dispersant adopts a high molecular type hyperdispersant, and specifically selects a polyhexamethylene polyol-polyethyleneimine segmented copolymer type dispersant. One end of the anchoring group is coated with pigment particles, and the other end is wound and adsorbed with resin, so that the paint has the advantages of good storage stability, good color development, excellent anti-settling property, prevention of flooding and floating and stable performance.
The anti-settling agent is organic bentonite. The organic bentonite is a thickening rheological agent, is different from common organic synthetic or natural polymer thickeners, and has excellent temperature stability, so that the limitation of the lowest or highest construction temperature is not generated in the using process, the storage stability of the coating is good, and the high-temperature anti-sagging effect is difficult to achieve by other organic thickening rheological agents.
The matting powder is TYS-100 of Shanxi Tian-nanometer material science and technology limited.
The pH regulator is dimethylethanolamine.
The preparation methods of the antirust sizing agent and the water-based coil coating finish paint are the same as example 1.
Example 5
The water-based coil steel coating finish paint comprises the following components in parts by mass: 23 parts of water-based polyester resin, 30 parts of antirust slurry, 1 part of amino resin, 0.5 part of acid catalyst, 0.5 part of wetting agent, 0.4 part of flatting agent, 0.3 part of defoaming agent, 1 part of adhesion promoter, 2 parts of wetting dispersant, 2 parts of ethylene glycol monobutyl ether, 5 parts of n-butyl alcohol, 4 parts of ethanol, 1 part of anti-settling agent, 0.5 part of matting powder, 5 parts of deionized water and 0.1 part of pH regulator.
Wherein, the antirust sizing agent comprises the following components in parts by weight: 30 parts of water-based polyester resin, 5 parts of zinc phosphate, 10 parts of aluminum tripolyphosphate, 6 parts of talcum powder, 50 parts of titanium dioxide, 6 parts of ferrotitanium powder, 20 parts of deionized water, 8 parts of ethylene glycol monobutyl ether, 5 parts of n-butyl alcohol, 8 parts of wetting dispersant, 0.5 part of defoaming agent and 0.5 part of pH regulator.
In this example, the waterborne polyester resin is HOMAPE4200-80 waterborne modified polyester polymer available from GOLD CHEMICAL CO.
The amino resin is partially methylated amino resin or semi-methylated amino resin, such as CYMEL325, Vinca MR625, Korean Mexican amino resin 03, 21, 25, etc.
The acid catalyst is isooctanoic acid.
The wetting agent is polyether modified dimethyl siloxane.
The leveling agent is acrylic ester, so that the surface tension of the coating is obviously reduced, the substrate wetting capacity of the coating and the flowability of a paint film are improved, and Benard vortexes are eliminated so as to prevent the floating. Contribute to improving the smoothness, scratch resistance and blocking resistance of the coating.
The defoaming agent is polydimethylsiloxane.
The adhesion promoter is silane coupling agent adhesion promoter.
The wetting dispersant is anionic wetting dispersant.
The anti-settling agent is polyethylene wax.
The matting powder is TYS-100 of Shanxi Tian-nanometer material science and technology limited.
The pH regulator is dimethylethanolamine.
The preparation methods of the antirust sizing agent and the water-based coil coating finish paint are the same as example 1.
Example 6
The water-based coil steel coating finish paint comprises the following components in parts by mass: 40 parts of water-based polyester resin, 47 parts of antirust slurry, 9 parts of amino resin, 2 parts of acid catalyst, 1 part of wetting agent, 1 part of flatting agent, 2 parts of defoaming agent, 4 parts of adhesion promoter, 9 parts of wetting dispersant, 10 parts of ethylene glycol monobutyl ether, 4 parts of n-butyl alcohol, 8 parts of ethanol, 5 parts of anti-settling agent, 3 parts of matting powder, 18 parts of deionized water and 0.5 part of pH regulator.
Wherein, the antirust sizing agent comprises the following components in parts by weight: 25 parts of water-based polyester resin, 3 parts of zinc phosphate, 7 parts of aluminum tripolyphosphate, 4 parts of talcum powder, 40 parts of titanium dioxide, 5 parts of ferrotitanium powder, 15 parts of deionized water, 5 parts of ethylene glycol monobutyl ether, 3 parts of n-butyl alcohol, 5 parts of wetting dispersant, 0.3 part of defoaming agent and 0.3 part of pH regulator.
In this example, the aqueous polyester resin was a WP-531 aqueous modified polyester polymer produced by Kyowa synergistic Polymer Co., Ltd.
The amino resin is partially methylated amino resin or semi-methylated amino resin, such as CYMEL325, Vinca MR625, and Korean Mexican amino resin 03, 21, 25.
The acid catalyst is the combination of dodecyl benzene sulfonic acid and p-toluenesulfonic acid in the ratio of 1: 2.
The wetting agent is a polyether siloxane copolymer from digo tego 270.
The leveling agent is polyester modified polysiloxane, so that the surface tension of the coating is obviously reduced, the substrate wetting capacity of the coating and the flowability of a paint film are improved, and Benard vortexes are eliminated so as to prevent the floating. Contribute to improving the smoothness, scratch resistance and blocking resistance of the coating.
The defoaming agent is an amide defoaming agent.
The adhesion promoter is 2802 water-based epoxy phosphate baking varnish adhesion promoter of Shenzhen Shanghai chemical Limited.
The wetting dispersant is a macromolecular hyperdispersant, and the macromolecular dispersant is also classified into a polyhexamethylene polyol-polyethyleneimine block copolymer dispersant, an acrylate macromolecular dispersant, polyurethane, macromolecular polyether or polyester macromolecular dispersant and the like. One end of the anchoring group is coated with pigment particles, and the other end is wound and adsorbed with resin, so that the paint has the advantages of good storage stability, good color development, excellent anti-settling property, prevention of flooding and floating and stable performance.
The anti-settling agent is modified hydrogenated castor oil.
The matting powder is TYS-100 of Shanxi Tian-nanometer material science and technology limited.
The pH regulator is dimethylethanolamine.
The preparation methods of the antirust sizing agent and the water-based coil coating finish paint are the same as example 1.
Performance testing
The performance test of the water-based coil coating finish paint provided in the embodiments 1 to 6 is performed according to the standard HGT3830-2006, and the specific test result is shown in Table 1.
The data in table 1 show that the water-based coil steel coating finish paint provided in embodiments 1 to 6 completely meets the requirements of the standard HGT3830-2006 on finish paint, the pencil hardness reaches H, T bend reaches T without peeling, MEK wiping resistance can reach more than 120 times, and meanwhile, the water-based coil steel coating finish paint has good corrosion resistance, yellowing resistance and boiling resistance and can reach physical and mechanical properties equivalent to those of solvent-based coatings.
The above examples are merely illustrative for clearly illustrating the present invention and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (8)
1. The water-based coil steel coating finish paint is characterized by comprising the following components in parts by weight:
20-40 parts of water-based polyester resin;
30-50 parts of antirust slurry;
1-10 parts of amino resin;
0.1-2 parts of an acid catalyst;
0.2-1 part of a wetting agent;
0.1-1 part of a leveling agent;
0.1-2 parts of a defoaming agent;
0.2-5 parts of an adhesion promoter;
0.3-10 parts of wetting dispersant;
1-5 parts of an anti-settling agent;
0.1-0.5 part of pH regulator;
4-23 parts of a cosolvent;
5-20 parts of water;
the wetting agent is any one or mixture of polyether siloxane, polyvinyl alcohol, acrylate and aldehyde ketone resin; the flatting agent is any one or mixture of polyether siloxane, polyvinyl alcohol, acrylate and aldehyde ketone resin;
the antirust slurry is prepared from the following components in parts by weight:
20-30 parts of water-based polyester resin; 2-5 parts of zinc phosphate; 4-10 parts of aluminum tripolyphosphate; 2-6 parts of talcum powder; 30-50 parts of titanium dioxide; 4-6 parts of ferrotitanium powder; 10-20 parts of water; 2-8 parts of ethylene glycol monobutyl ether; 1-5 parts of n-butyl alcohol; 2-8 parts of a wetting dispersant; 0.05-0.5 part of defoaming agent; 0.1-0.5 part of pH regulator;
the wetting dispersant is a macromolecular hyperdispersant;
the high molecular type hyperdispersant is BYK-190 of Bike chemical company in Germany.
2. The water-based coil steel coating finish paint as claimed in claim 1, wherein the antirust slurry is prepared from the following components in parts by weight:
22 parts of water-based polyester resin; 2 parts of zinc phosphate; 5 parts of aluminum tripolyphosphate; 3 parts of talcum powder; 34.7 parts of titanium dioxide; 5 parts of ferrotitanium powder; 15 parts of water; 5 parts of ethylene glycol monobutyl ether; 3 parts of n-butyl alcohol; 5 parts of wetting dispersant; 0.2 part of defoaming agent; 0.1 part of pH regulator.
3. The water-based coil steel coating finish paint as claimed in any one of claims 1 to 2, wherein the water-based polyester resin has a molecular weight of 3000 to 7000, a hydroxyl value of 10 to 60mg KOH/g, and an acid value of 15 to 75mg KOH/g; the amino resin is at least one of fully methylated amino resin, partially methylated amino resin, butylated amino resin and methyl butyl mixed etherified amino resin; the acid catalyst is one or a combination of a plurality of dodecyl benzene sulfonic acid, isooctanoic acid and p-toluenesulfonic acid; the anti-settling agent is one or a mixture of more of polyamide wax, organic bentonite, castor oil derivatives, fumed silica and polyolefin wax; the defoaming agent is any one or mixture of more of organic siloxane, amide defoaming agent, n-butyl alcohol, ethylene oxide, polyethylene wax, phosphate ester and mineral oil; the adhesion promoter is any one or combination of more of resin adhesion promoters, silane coupling agents and titanate coupling agents; the pH regulator is dimethylethanolamine.
4. The water-based coil steel coating finish paint as claimed in claim 1, wherein the cosolvent specifically comprises: 1-10 parts of ethylene glycol monobutyl ether; 1-5 parts of n-butyl alcohol; 2-8 parts of ethanol.
5. The water-based coil steel coating finish paint as claimed in claim 1, further comprising 0.5-3 parts of matting powder.
6. The preparation method of the water-based coil steel coating finish paint according to any one of claims 1 to 5, which is characterized by comprising the following steps:
(1) weighing the water-based polyester resin according to a formula, putting the water-based polyester resin into a stirring kettle, then putting the antirust slurry according to the formula amount, starting stirring, and controlling the rotating speed to be 600-800 r/min;
(2) uniformly mixing the cosolvent and the acid catalyst which are weighed according to the weight parts of the formula, putting the mixture into a stirring kettle, and continuously stirring;
(3) sequentially adding amino resin, a wetting agent, a flatting agent, a defoaming agent, an adhesion promoter, a wetting dispersant and an anti-settling agent which are weighed according to the weight parts of the formula, and stirring at a medium speed, wherein the rotating speed is controlled to be 1200-1500 rpm and lasts for 15-20 minutes;
(4) adding water weighed according to the weight part of the formula, and continuously dispersing for 20 minutes;
(5) and adding a pH regulator weighed according to the weight part of the formula, regulating the pH value to 8.5-9.5, and continuously stirring for 10 minutes.
7. The preparation method of the water-based coil steel coating finish paint according to claim 6, wherein the preparation method of the antirust slurry specifically comprises the following steps: weighing water-based polyester resin, zinc phosphate, aluminum tripolyphosphate, talcum powder, titanium dioxide, titanium iron powder, water, ethylene glycol monobutyl ether, n-butyl alcohol, a wetting dispersant, a defoaming agent and a pH regulator according to parts by weight, putting into mixing equipment, stirring at a rotating speed of 400-800 rpm for 10-20 minutes to obtain prefabricated mixed slurry, and grinding the prefabricated mixed slurry to be less than 15 mu m to obtain the antirust slurry.
8. The preparation method of the water-based coil coating finish paint as claimed in claim 6, wherein the matting powder weighed according to the weight part of the formula is added in the step (3).
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| CN112680050A (en) * | 2020-12-31 | 2021-04-20 | 广东四方威凯新材料有限公司 | Water-based paint and preparation method thereof |
| CN112951477B (en) * | 2021-01-18 | 2022-08-12 | 成都宏科电子科技有限公司 | Tungsten slurry for printing white alumina multilayer ceramic substrate and preparation method thereof |
| CN113122113A (en) * | 2021-04-25 | 2021-07-16 | 马玉国 | Preparation method of durable paint |
| CN113755079A (en) * | 2021-10-26 | 2021-12-07 | 江苏海晟涂料有限公司 | Anti-drop metal surface water-based paint |
| CN114836111B (en) * | 2022-06-09 | 2023-09-12 | 深圳市深赛尔股份有限公司 | Fluorine modified polyester system water-based coil steel coating and preparation method thereof |
| CN115029052A (en) * | 2022-06-09 | 2022-09-09 | 深圳市深赛尔股份有限公司 | Water-based silicon-modified polyester coating and preparation method thereof |
| CN114921157A (en) * | 2022-06-29 | 2022-08-19 | 深圳市深赛尔股份有限公司 | Water-based polyester coil steel coating and preparation method thereof |
| CN115074004A (en) * | 2022-07-04 | 2022-09-20 | 深圳市深赛尔股份有限公司 | Water-based organic silicon modified polyester coil steel coating and preparation method thereof |
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| CN101698771B (en) * | 2009-09-24 | 2012-01-25 | 中国海洋石油总公司 | Water-based primer-topcoat braking paint and preparation method thereof |
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