CN111117463B - Water-based spray coating two-component polyurethane coating and preparation method thereof - Google Patents

Water-based spray coating two-component polyurethane coating and preparation method thereof Download PDF

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CN111117463B
CN111117463B CN202010013547.0A CN202010013547A CN111117463B CN 111117463 B CN111117463 B CN 111117463B CN 202010013547 A CN202010013547 A CN 202010013547A CN 111117463 B CN111117463 B CN 111117463B
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coating
agent
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water
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CN111117463A (en
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徐晓利
孙立方
许利莎
王玮
董亮
田会社
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Shijiazhuang Paint Co
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Shijiazhuang Paint Co
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    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D175/00Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
    • C09D175/04Polyurethanes
    • CCHEMISTRY; METALLURGY
    • C09DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09DCOATING 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
    • C09D7/00Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
    • C09D7/40Additives
    • C09D7/60Additives non-macromolecular
    • C09D7/61Additives non-macromolecular inorganic
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08KUse of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00Use of inorganic substances as compounding ingredients
    • C08K3/18Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20Oxides; Hydroxides
    • C08K3/22Oxides; Hydroxides of metals
    • C08K2003/2237Oxides; Hydroxides of metals of titanium
    • C08K2003/2241Titanium dioxide

Abstract

The invention relates to the technical field of coatings, and particularly discloses a water-based shower coating two-component polyurethane coating and a preparation method thereof, wherein the water-based shower coating two-component polyurethane coating comprises a component A and a component B; the component A comprises the following components in percentage by mass: 45-60% of aqueous polyurethane dispersoid, 0.8-1.2% of wetting dispersant, 0.5-1.2% of defoaming agent, 15-20% of pigment, 4-5.3% of cosolvent, 0.3-0.6% of flatting agent, 0.2-0.5% of thickening agent and the balance of deionized water; the component B is an isocyanate curing agent; the mass ratio of the component A to the component B is 4-6: 1. The paint has good dispersibility and stability, and a paint film after spray coating has smooth appearance, does not have the defects of floating color, prickly heat, pit extraction and the like, and has excellent service performance.

Description

Water-based spray coating two-component polyurethane coating and preparation method thereof
Technical Field
The invention relates to the technical field of coatings, in particular to a water-based curtain coating two-component polyurethane coating and a preparation method thereof.
Background
In the face of current environmental pressures, waterborne coatings are currently being researched and applied more and more extensively. The waterborne polyurethane coating has the characteristics of excellent mechanical property, chemical resistance, high weather resistance, high gloss, plumpness, decorativeness, good compatibility with other resins and the like, and is a research focus of the current coating industry.
Common construction modes of the water-based industrial paint comprise spraying, brushing, roller coating, curtain coating, dip coating and the like, wherein the curtain coating process is a construction mode of spraying the coating on an object to be coated by utilizing a nozzle to form a coating. The coating in the curtain coating mode is less in using amount, economical and efficient, and can obtain a uniform coating, and the curtain coating mode has better coating advantages than spraying, rolling and brushing when being commonly used on large-sized objects, long pipe fittings and objects with complex structures. However, for the aqueous two-component polyurethane coating, the defects of paint films such as floating color, hair, prickly heat, pit extraction and the like often appear in the curtain coating construction process, so that the glossiness of the paint films is low, the appearance effect is poor, and the defects are aggravated by the impact effect in the curtain coating construction process.
Disclosure of Invention
The invention provides a water-based shower coating two-component polyurethane coating and a preparation method thereof, aiming at the problem that the existing water-based two-component polyurethane coating is easy to have paint film defects such as floating color, hair, miliaria, pit extraction and the like in the shower coating process.
In order to achieve the purpose of the invention, the embodiment of the invention adopts the following technical scheme:
a water-based spray coating two-component polyurethane coating comprises a component A and a component B;
the component A comprises the following components in percentage by mass:
45-60% of aqueous polyurethane dispersoid, 0.8-1.2% of wetting dispersant, 0.5-1.2% of defoaming agent, 15-20% of pigment, 4-5.3% of cosolvent, 0.3-0.6% of flatting agent, 0.2-0.5% of thickening agent and the balance of deionized water;
wherein the wetting dispersant consists of a copolymer dispersant containing high pigment affinity groups and an alkynol dispersant in a mass ratio of 3-5: 1; the defoaming agent consists of a polysiloxane defoaming agent and a polyether siloxane copolymer containing gas-phase silicon dioxide in a mass ratio of 1: 1-1.5;
the component B is an isocyanate curing agent;
the mass ratio of the component A to the component B is 4-6: 1.
Compared with the prior art, the water-based curtain coating two-component polyurethane coating provided by the invention selects the copolymer dispersant with high pigment affinity group as the wetting dispersant, and simultaneously adds the alkynol dispersant in a certain proportion, so that the adsorption capacity of the anchoring group in the copolymer with high pigment affinity group and the pigment is enhanced, the solvation chain segment in the copolymer with high pigment affinity group is fully extended in the polymerization structure of the film-forming substance, the stability of a pigment dispersion system is improved, the phenomenon of flooding and flowering caused by uneven dispersion of the pigment in the coating curtain coating process is avoided, and simultaneously, the addition of the alkynol dispersant can further improve the wetting property of the pigment, reduce the viscosity of the system, improve the grinding efficiency in the coating preparation process, and enable the coating to achieve an ideal dispersion effect; the flatness, color uniformity and glossiness of the plate surface of the coating can be obviously improved;
in general, if the compatibility of the defoaming agent with a system is good, the defoaming capability of the defoaming agent is weak, and the defoaming effect cannot be achieved; if the compatibility of the defoaming agent and a system is poor, the defoaming capability is strong, but the defects of shrinkage, miliaria, pit extraction or fish eyes and the like can be caused, and even in the curtain coating process, the curtain can be broken; the silicone defoamer and the polyether siloxane copolymer containing gas-phase silicon dioxide are mixed according to a specific proportion to serve as a mixed defoamer and are used in the water-based two-component polyurethane coating, so that the water-based two-component polyurethane coating has the characteristic of good compatibility with a coating system, and has high defoaming capability, and after the coating is constructed in a spray coating mode, the conditions of shrinkage cavity, prickly heat, pit extraction, fish eyes or curtain breaking of the water-based two-component polyurethane coating can be completely avoided, so that the coating has excellent construction performance.
Wherein, the copolymer dispersant containing high pigment affinity group can select TEGO 755W with dikao; the alkynol dispersant can be selected from the winning Surfynol 104E; the polysiloxane foam breaker can be BYK028 of Bike; fumed silica-containing polyether siloxane copolymer TEGO Airex902, Digao; the isocyanate curing agent may be Bayhydur 305 available from Bayer, Germany.
Preferably, the aqueous polyurethane dispersion is an aqueous anionic polyurethane dispersion, and Dispercoll U53 from bayer, germany may be selected.
Preferably, the pigment consists of titanium dioxide and carbon black in a mass ratio of 8-10: 1.
Preferably, the cosolvent is dipropylene glycol methyl ether.
Preferably, the leveling agent consists of an acrylate leveling agent and a polyether siloxane leveling agent in a mass ratio of 1-2: 1.
Wherein, the acrylic ester flatting agent can be BYK3566 of Bike, and the polyether siloxane flatting agent can be Afcona3587 of Effolna.
The preferable combination of the acrylate leveling agent and the polyether siloxane leveling agent is used as the leveling agent, so that the compatibility of the leveling agent and a system can be further increased, the surface tension of a paint film is reduced, the fluidity of the paint film in the spray coating process is increased, the board effect, the paint film glossiness and the construction performance are further improved, the paint film defect caused by volatilization of water and a solvent in the early drying stage of the paint film is thoroughly eliminated, and the final leveling effect is influenced because orange marks appear on the surface of the paint film due to insufficient leveling power in the middle and later drying stages of the paint film.
Preferably, the leveling agent consists of an acrylate leveling agent and an acetylene glycol leveling agent in a mass ratio of 1-2: 1.
Wherein, the acrylic ester flatting agent can be BYK3566, and the acetylene glycol flatting agent can be Dynol 607.
The preferable acrylate leveling agent and the acetylene glycol leveling agent have synergistic effect, so that the compatibility of the leveling agent and a system can be further increased, the surface tension of a paint film is reduced, the fluidity of the paint film in a flow coating process is increased, the board effect, the paint film glossiness and the application performance are further improved, the paint film defect caused by water and solvent volatilization in the early drying period of the paint film is thoroughly eliminated, and the final leveling effect is influenced because orange marks appear on the surface of the board surface of the paint film due to insufficient leveling power in the middle and later drying periods of the paint film.
Preferably, the thickener is an associative polyurethane thickener.
Wherein the associative polyurethane thickener is RHEOLATE 278 of Haimines
The invention also provides a preparation method of the water-based shower coating two-component polyurethane coating. The preparation method at least comprises the following steps:
a. mixing deionized water, a wetting dispersant, a defoaming agent, a cosolvent, a leveling agent and a pigment according to a mass ratio, and stirring for 10-15min at the speed of 1000-;
b. grinding the slurry until the fineness is less than or equal to 15 um;
c. uniformly mixing the aqueous polyurethane dispersion and the ground slurry, adding a thickening agent to adjust the viscosity to the construction viscosity, and obtaining paint slurry for later use;
d. before construction, the paint paste and the isocyanate curing agent are uniformly mixed according to the mass ratio of 4-6:1 to obtain the water-based flow coating two-component polyurethane coating.
Compared with the prior art, the preparation method of the water-based shower coating two-component polyurethane coating provided by the invention has the advantages of simple preparation process, low equipment requirement, safety, environmental protection and no generation of harmful gas.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1
A water-based spray coating two-component polyurethane coating comprises a component A and a component B;
the component A comprises the following components in percentage by mass:
45% of water-based anionic polyurethane dispersion, 1.2% of wetting dispersant, 1.2% of defoaming agent, 20% of pigment, 4% of cosolvent, 0.6% of flatting agent, 0.5% of thickening agent and 27.5% of deionized water;
wherein the aqueous anionic polyurethane dispersion is Dispercoll U53 from Bayer, Germany; the wetting dispersant consists of TEGO 755W and Surfynol 104E in a mass ratio of 3: 1; the defoaming agent consists of BYK028 and TEGO Airex902 in a mass ratio of 1: 1; the pigment consists of titanium dioxide and carbon black in a mass ratio of 9: 1; the cosolvent is dipropylene glycol methyl ether of the Dow chemical; the leveling agent consists of BYK3566 and Afcona3587 in a mass ratio of 1: 1; the thickening agent is rheelate 278 of hamming;
the component B is an isocyanate curing agent, and Bayhydur 305 of Germany Bayer is used as the isocyanate curing agent;
the mass ratio of the component A to the component B is 6: 1.
The preparation method of the water-based shower coating two-component polyurethane coating comprises the following steps:
a. mixing deionized water, a wetting dispersant, a defoaming agent, dipropylene glycol methyl ether, a leveling agent and titanium dioxide according to a mass ratio, and stirring for 10min at a speed of 1000r/min to obtain uniformly dispersed slurry;
b. grinding the slurry until the fineness is less than or equal to 15 um;
c. uniformly mixing the aqueous polyurethane dispersion and the ground slurry, adding a thickening agent to adjust the viscosity to the construction viscosity, and obtaining paint slurry for later use;
d. before construction, the paint paste and the isocyanate curing agent are uniformly mixed according to the mass ratio of 6:1 to obtain the water-based flow coating double-component polyurethane coating.
Example 2
A water-based spray coating two-component polyurethane coating comprises a component A and a component B;
the component A comprises the following components in percentage by mass:
55% of water-based anionic polyurethane dispersion, 1% of wetting dispersant, 0.8% of defoaming agent, 18% of pigment, 4.9% of cosolvent, 0.5% of flatting agent, 0.3% of thickening agent and 19.5% of deionized water;
wherein the aqueous anionic polyurethane dispersion is Dispercoll U53 from Bayer, Germany; the wetting dispersant consists of TEGO 755W and Surfynol 104E in a mass ratio of 4: 1; the defoaming agent consists of BYK028 and TEGO Airex902 in a mass ratio of 1: 1.2; the pigment consists of titanium dioxide and carbon black in a mass ratio of 8: 1; the cosolvent is dipropylene glycol methyl ether of the Dow chemical; the leveling agent consists of BYK3566 and Afcona3587 in a mass ratio of 1.5: 1; the thickening agent is rheelate 278 of hamming;
the component B is an isocyanate curing agent, and Bayhydur 305 of Germany Bayer is used as the isocyanate curing agent;
the mass ratio of the component A to the component B is 5: 1.
The preparation method of the water-based shower coating two-component polyurethane coating comprises the following steps:
a. mixing deionized water, a wetting dispersant, a defoaming agent, dipropylene glycol methyl ether, a leveling agent and titanium dioxide according to a mass ratio, and stirring at 1100r/min for 12min to obtain uniformly dispersed slurry;
b. grinding the slurry until the fineness is less than or equal to 15 um;
c. uniformly mixing the aqueous polyurethane dispersion and the ground slurry, adding a thickening agent to adjust the viscosity to the construction viscosity, and obtaining paint slurry for later use;
d. before construction, the paint paste and the isocyanate curing agent are uniformly mixed according to the mass ratio of 5:1 to obtain the water-based flow coating double-component polyurethane coating.
Example 3
A water-based spray coating two-component polyurethane coating comprises a component A and a component B;
the component A comprises the following components in percentage by mass:
60% of water-based anionic polyurethane dispersion, 0.8% of wetting dispersant, 0.5% of defoaming agent, 15% of pigment, 5.3% of cosolvent, 0.3% of flatting agent, 0.2% of thickening agent and 17.9% of deionized water;
wherein the aqueous anionic polyurethane dispersion is Dispercoll U53 from Bayer, Germany; the wetting dispersant consists of TEGO 755W and Surfynol 104E in a mass ratio of 5: 1; the defoaming agent consists of BYK028 and TEGO Airex902 in a mass ratio of 1: 1.5; the pigment consists of titanium dioxide and carbon black in a mass ratio of 10: 1; the cosolvent is dipropylene glycol methyl ether of the Dow chemical; the leveling agent consists of BYK3566 and Afcona3587 in a mass ratio of 2: 1; the thickening agent is rheelate 278 of hamming;
the component B is an isocyanate curing agent, and Bayhydur 305 of Germany Bayer is used as the isocyanate curing agent;
the mass ratio of the component A to the component B is 4: 1.
The preparation method of the water-based shower coating two-component polyurethane coating comprises the following steps:
a. mixing deionized water, a wetting dispersant, a defoaming agent, dipropylene glycol methyl ether, a leveling agent and titanium dioxide according to a mass ratio, and stirring at 1200r/min for 15min to obtain uniformly dispersed slurry;
b. grinding the slurry until the fineness is less than or equal to 15 um;
c. uniformly mixing the aqueous polyurethane dispersion and the ground slurry, adding a thickening agent to adjust the viscosity to the construction viscosity, and obtaining paint slurry for later use;
d. before construction, the paint paste and the isocyanate curing agent are uniformly mixed according to the mass ratio of 4:1 to obtain the water-based flow coating double-component polyurethane coating.
Example 4
A water-based spray coating two-component polyurethane coating comprises a component A and a component B;
the component A comprises the following components in percentage by mass:
45% of water-based anionic polyurethane dispersion, 1.2% of wetting dispersant, 1.2% of defoaming agent, 20% of pigment, 4% of cosolvent, 0.6% of flatting agent, 0.5% of thickening agent and 27.5% of deionized water;
wherein the aqueous anionic polyurethane dispersion is Dispercoll U53 from Bayer, Germany; the wetting dispersant consists of TEGO 755W and Surfynol 104E in a mass ratio of 3: 1; the defoaming agent consists of BYK028 and TEGO Airex902 in a mass ratio of 1: 1; the pigment consists of titanium dioxide and carbon black in a mass ratio of 9: 1; the cosolvent is dipropylene glycol methyl ether of the Dow chemical; the leveling agent consists of BYK3566 and Dynol607 in a mass ratio of 1: 1; the thickening agent is rheelate 278 of hamming;
the component B is an isocyanate curing agent, and Bayhydur 305 of Germany Bayer is used as the isocyanate curing agent;
the mass ratio of the component A to the component B is 6: 1.
The preparation method of the water-based shower coating two-component polyurethane coating comprises the following steps:
a. mixing deionized water, a wetting dispersant, a defoaming agent, dipropylene glycol methyl ether, a leveling agent and titanium dioxide according to a mass ratio, and stirring for 10min at a speed of 1000r/min to obtain uniformly dispersed slurry;
b. grinding the slurry until the fineness is less than or equal to 15 um;
c. uniformly mixing the aqueous polyurethane dispersion and the ground slurry, adding a thickening agent to adjust the viscosity to the construction viscosity, and obtaining paint slurry for later use;
d. before construction, the paint paste and the isocyanate curing agent are uniformly mixed according to the mass ratio of 6:1 to obtain the water-based flow coating double-component polyurethane coating.
Example 5
A water-based spray coating two-component polyurethane coating comprises a component A and a component B;
the component A comprises the following components in percentage by mass:
55% of water-based anionic polyurethane dispersion, 1% of wetting dispersant, 0.8% of defoaming agent, 18% of pigment, 4.9% of cosolvent, 0.5% of flatting agent, 0.3% of thickening agent and 19.5% of deionized water;
wherein the aqueous anionic polyurethane dispersion is Dispercoll U53 from Bayer, Germany; the wetting dispersant consists of TEGO 755W and Surfynol 104E in a mass ratio of 4: 1; the defoaming agent consists of BYK028 and TEGO Airex902 in a mass ratio of 1: 1.2; the pigment consists of titanium dioxide and carbon black in a mass ratio of 8: 1; the cosolvent is dipropylene glycol methyl ether of the Dow chemical; the leveling agent consists of BYK3566 and Dynol607 at a mass ratio of 1.5: 1; the thickening agent is rheelate 278 of hamming;
the component B is an isocyanate curing agent, and Bayhydur 305 of Germany Bayer is used as the isocyanate curing agent;
the mass ratio of the component A to the component B is 5: 1.
The preparation method of the water-based shower coating two-component polyurethane coating comprises the following steps:
a. mixing deionized water, a wetting dispersant, a defoaming agent, dipropylene glycol methyl ether, a leveling agent and titanium dioxide according to a mass ratio, and stirring at 1100r/min for 12min to obtain uniformly dispersed slurry;
b. grinding the slurry until the fineness is less than or equal to 15 um;
c. uniformly mixing the aqueous polyurethane dispersion and the ground slurry, adding a thickening agent to adjust the viscosity to the construction viscosity, and obtaining paint slurry for later use;
d. before construction, the paint paste and the isocyanate curing agent are uniformly mixed according to the mass ratio of 5:1 to obtain the water-based flow coating double-component polyurethane coating.
Example 6
A water-based spray coating two-component polyurethane coating comprises a component A and a component B;
the component A comprises the following components in percentage by mass:
60% of water-based anionic polyurethane dispersion, 0.8% of wetting dispersant, 0.5% of defoaming agent, 15% of pigment, 5.3% of cosolvent, 0.3% of flatting agent, 0.2% of thickening agent and 17.9% of deionized water;
wherein the aqueous anionic polyurethane dispersion is Dispercoll U53 from Bayer, Germany; the wetting dispersant consists of TEGO 755W and Surfynol 104E in a mass ratio of 5: 1; the defoaming agent consists of BYK028 and TEGO Airex902 in a mass ratio of 1: 1.5; the cosolvent is dipropylene glycol methyl ether of the Dow chemical; the leveling agent consists of BYK3566 and Dynol607 in a mass ratio of 2: 1; the thickening agent is rheelate 278 of hamming;
the component B is an isocyanate curing agent, and Bayhydur 305 of Germany Bayer is used as the isocyanate curing agent;
the mass ratio of the component A to the component B is 4: 1.
The preparation method of the water-based shower coating two-component polyurethane coating comprises the following steps:
a. mixing deionized water, a wetting dispersant, a defoaming agent, dipropylene glycol methyl ether, a leveling agent and titanium dioxide according to a mass ratio, and stirring at 1200r/min for 15min to obtain uniformly dispersed slurry;
b. grinding the slurry until the fineness is less than or equal to 15 um;
c. uniformly mixing the aqueous polyurethane dispersion and the ground slurry, adding a thickening agent to adjust the viscosity to the construction viscosity, and obtaining paint slurry for later use;
d. before construction, the paint paste and the isocyanate curing agent are uniformly mixed according to the mass ratio of 4:1 to obtain the water-based flow coating double-component polyurethane coating.
Comparative example 1
The TEGO 755W in example 1 is replaced by macromolecular copolymer ammonium salt dispersant SN-2327 of deep bamboo, and other components and preparation methods are the same as those in example 1, so that the water-based curtain coating two-component polyurethane coating is obtained.
Comparative example 2
An organic silicon defoamer Afcona2502 of Effkona is used for replacing TEGO Airex902 in the example 1, and other components and the preparation method are the same as those of the example 1, so that the water-based flow coating two-component polyurethane coating is obtained.
Comparative example 3
The acrylic ester BYK3566 is independently used as a flatting agent, and other components and the preparation method are the same as those of the example 1, so that the water-based shower coating two-component polyurethane coating is obtained.
Comparative example 4
Dynol607 was used alone as a leveling agent, and other components and preparation methods were the same as in example 4, to obtain an aqueous shower coating two-component polyurethane coating.
The properties of the aqueous curtain coating two-component polyurethane coatings of examples 1-6 and comparative examples 1-4 were tested, and the test results are shown in the following table:
the above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents or improvements made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (6)

1. A water-based shower coating two-component polyurethane coating is characterized in that: comprises a component A and a component B;
the component A comprises the following components in percentage by mass:
45-60% of aqueous polyurethane dispersoid, 0.8-1.2% of wetting dispersant, 0.5-1.2% of defoaming agent, 15-20% of pigment, 4-5.3% of cosolvent, 0.3-0.6% of flatting agent, 0.2-0.5% of thickening agent and the balance of deionized water;
wherein the wetting dispersant consists of a copolymer dispersant containing high pigment affinity groups and an alkynol dispersant in a mass ratio of 3-5: 1; the defoaming agent consists of a polysiloxane defoaming agent and a polyether siloxane copolymer containing gas-phase silicon dioxide in a mass ratio of 1: 1-1.5; the leveling agent consists of an acrylate leveling agent and a polyether siloxane leveling agent in a mass ratio of 1-2:1, or consists of an acrylate leveling agent and an acetylene glycol leveling agent in a mass ratio of 1-2: 1;
the component B is an isocyanate curing agent;
the mass ratio of the component A to the component B is 4-6: 1.
2. The aqueous flow-coating two-component polyurethane coating of claim 1, characterized in that: the aqueous polyurethane dispersion is an aqueous anionic polyurethane dispersion.
3. The aqueous flow-coating two-component polyurethane coating of claim 1, characterized in that: the pigment consists of titanium dioxide and carbon black in a mass ratio of 8-10: 1.
4. The aqueous flow-coating two-component polyurethane coating of claim 1, characterized in that: the cosolvent is dipropylene glycol methyl ether.
5. The aqueous flow-coating two-component polyurethane coating of claim 1, characterized in that: the thickening agent is an associated polyurethane thickening agent.
6. The method for preparing the aqueous curtain coating two-component polyurethane coating of any one of claims 1 to 5, characterized in that: the method comprises the following process steps:
a. mixing deionized water, a wetting dispersant, a defoaming agent, a cosolvent, a leveling agent and a pigment according to a mass ratio, and stirring for 10-15min at the speed of 1000-;
b. grinding the slurry until the fineness is less than or equal to 15 um;
c. uniformly mixing the aqueous polyurethane dispersion and the ground slurry, adding a thickening agent to adjust the viscosity to the construction viscosity, and obtaining paint slurry for later use;
d. before construction, the paint paste and the isocyanate curing agent are uniformly mixed according to the mass ratio of 4-6:1 to obtain the water-based flow coating two-component polyurethane coating.
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CN104592877B (en) * 2015-01-08 2018-05-11 中华制漆(新丰)有限公司 Woodenware lacquer and preparation method thereof, application process
CN109535962A (en) * 2018-10-30 2019-03-29 河北晨阳工贸集团有限公司 A kind of yard piping double-component aqueous finishing coat and preparation method thereof

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