CN110922878A - Water-based high-gloss two-component acrylic polyurethane coating and preparation method thereof - Google Patents
Water-based high-gloss two-component acrylic polyurethane coating and preparation method thereof Download PDFInfo
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- CN110922878A CN110922878A CN201911303820.7A CN201911303820A CN110922878A CN 110922878 A CN110922878 A CN 110922878A CN 201911303820 A CN201911303820 A CN 201911303820A CN 110922878 A CN110922878 A CN 110922878A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
- C09D175/04—Polyurethanes
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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- C08G18/00—Polymeric products of isocyanates or isothiocyanates
- C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
- C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
- C08G18/40—High-molecular-weight compounds
- C08G18/62—Polymers of compounds having carbon-to-carbon double bonds
- C08G18/6216—Polymers of alpha-beta ethylenically unsaturated carboxylic acids or of derivatives thereof
- C08G18/622—Polymers of esters of alpha-beta ethylenically unsaturated carboxylic acids
- C08G18/6225—Polymers of esters of acrylic or methacrylic acid
- C08G18/6229—Polymers of hydroxy groups containing esters of acrylic or methacrylic acid with aliphatic polyalcohols
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Abstract
The invention relates to a water-based high-gloss two-component acrylic polyurethane coating and a preparation method thereof, belonging to the technical field of coatings. Comprises a component A and a component B. Wherein the component A comprises the following components in parts by weight: 20-40 parts of an aqueous hydroxy acrylic acid dispersion I, 20-40 parts of an aqueous hydroxy acrylic acid dispersion II, 0-0.5 part of a pH regulator, 1-5 parts of a conventional auxiliary agent, 1-6 parts of a film-forming auxiliary agent, 1-25 parts of a pigment and filler, 0-1.5 parts of a special auxiliary agent, 0.1-0.5 part of bentonite, 5-20 parts of deionized water, 0-1 part of a flash rust inhibitor and 0-1 part of a thickening agent; the component B comprises the following components in parts by weight: 20-70 parts of isocyanate curing agent I, 20-70 parts of isocyanate curing agent II and 0-30 parts of cosolvent. The two-component coating disclosed by the invention has the advantages of high gloss, high fullness and small fog shadow, and solves the problems of low performance and poor appearance of a water-based coating.
Description
Technical Field
The invention belongs to the technical field of coatings, and particularly relates to a water-based high-gloss two-component acrylic polyurethane coating and a preparation method thereof.
Background
The water-based paint takes water as a solvent, and the use of toluene and xylene is greatly reduced by taking water as a diluent during construction, so that the discharge of VOC is reduced. Thus, the environmental-friendly water-based paint reduces the pollution to the atmospheric environment while protecting the safety of human life and property. At present, in high-end industries, the proportion of water-based paint and domestic paint is relatively low, and the restriction conditions are mainly on the performance and appearance of the water-based paint.
Disclosure of Invention
In order to solve the problems of low performance and poor appearance of the water-based paint in the existing market, the invention provides a water-based high-gloss two-component acrylic polyurethane paint to solve the problems. The invention adjusts the luster and the fullness by blending the water-based hydroxyl acrylic acid with different characteristics, and improves the tolerance and the application property (activation period) of the coating by blending the isocyanate curing agent with different characteristics. The heat resistance of the coating is improved by adding an antioxidant, and the adhesion and water resistance are improved by adding a silane coupling agent.
The technical scheme of the invention is as follows:
the water-based high-gloss two-component acrylic polyurethane coating comprises a component A and a component B, wherein,
the component A comprises the following components in parts by weight: 20-40 parts of an aqueous hydroxy acrylic acid dispersion I, 20-40 parts of an aqueous hydroxy acrylic acid dispersion II, 0-0.5 part of a pH regulator, 1-5 parts of a conventional auxiliary agent, 1-6 parts of a film-forming auxiliary agent, 1-25 parts of a pigment and filler, 0-1.5 parts of a special auxiliary agent, 0.1-0.5 part of bentonite, 5-20 parts of deionized water, 0-1 part of a flash rust inhibitor and 0-1 part of a thickening agent;
the component B comprises the following components in parts by weight: 20-70 parts of isocyanate curing agent I, 20-70 parts of isocyanate curing agent II and 0-30 parts of cosolvent.
Preferably, the composition comprises the following components in parts by weight:
and (2) component A: 30-40 parts of an aqueous hydroxyl acrylic dispersion I, 20-30 parts of an aqueous hydroxyl acrylic dispersion II, 0.2-0.5 part of a pH regulator, 2-5 parts of a conventional auxiliary agent, 2-5 parts of a film forming auxiliary agent, 2-25 parts of a pigment filler, 0.1-1.5 parts of a special auxiliary agent, 0.1-0.3 part of bentonite, 6-15 parts of deionized water, 0.1-1 part of a flash rust inhibitor and 0.1-1 part of a thickening agent;
and (B) component: 20-60 parts of isocyanate curing agent I, 20-40 parts of isocyanate curing agent II and 10-30 parts of cosolvent.
Preferably, the type of the aqueous hydroxyl acrylic acid dispersoid I is Bayer-2470, the hydroxyl content is 3.9%, and the solid content is 44-47%.
Preferably, the type of the aqueous hydroxyl acrylic acid dispersoid II is Bayer-2646, the hydroxyl content is 3.5-4.0%, and the solid content is 40-50%.
Preferably, the pH regulator is one or two of N, N-dimethylethanolamine or isobutanol amine, and the pH regulator has the advantages of being capable of quickly regulating the pH of the paint liquid and good in stability.
Preferably, the conventional auxiliary agent is a combination of several of a water-based organic silicon defoaming agent, a silicon-free defoaming agent, a leveling agent, a dispersing agent and a wetting agent, wherein the model of the water-based organic silicon defoaming agent is BYK-024, the model of the silicon-free defoaming agent is BYK-011, the model of the leveling agent is TEGO-100, the model of the dispersing agent is TEGO-750W, and the model of the wetting agent is TEGO-4100.
Preferably, the film-forming auxiliary agent is an ether or alcohol ester film-forming substance, specifically one or a combination of more of ethylene glycol butyl ether, dipropylene glycol methyl ether, dipropylene glycol butyl ether, diethylene glycol butyl ether and alcohol ester twelve, and has the advantages of being capable of adjusting surface drying speed and assisting in film formation.
Preferably, the pigment and filler is one or a combination of several of carbon black, iron oxide red, phthalocyanine blue, phthalocyanine green, iron oxide yellow, titanium white pigment and barium sulfate.
Preferably, the special auxiliary agents are a silane coupling agent and an antioxidant, and the silane coupling agent is MP200 in model number, so that the adhesion to the base material and the water resistance can be improved; the antioxidant is 340DW in type, and can improve the heat resistance of the paint film.
Preferably, the flash rust inhibitor is one or a combination of nitrite, borate and phosphate, and has the advantage of improving the initial flash rust prevention capability in the specific type Hamming-179.
Preferably, the thickening agent is a polyurethane thickening agent with the type of Haimines-299.
Preferably, the isocyanate curing agent I is hydrophilic aliphatic isocyanate, the specific model is Kochia-2655, the solid content of the isocyanate curing agent is 100%, and the NCO content is 20.0-22.0%.
Preferably, the isocyanate curing agent II is hydrophilic aliphatic isocyanate, the specific model is Coresi-3900, the solid content of the isocyanate curing agent is 100%, the NCO content is 23.5 +/-0.5%, and the isocyanate curing agent has the advantages of good water resistance and good anti-foaming property.
Preferably, the cosolvent is propylene glycol diacetate, and has the advantages of good miscibility and long activation period.
The invention also aims to provide a preparation method of the water-based high-gloss two-component acrylic polyurethane coating, which comprises the following steps:
preparation of component A:
(1) controlling the rotating speed to be 800-1000 r/min in parts by weight, sequentially adding deionized water, a pH regulator, a dispersing agent, bentonite, an organic silicon defoaming agent and pigment and filler into a reaction tank under a stirring state, dispersing for 20min, and uniformly mixing to form a mixed solution for later use;
(2) grinding the mixed liquid in the step (1) until the fineness is less than 20 mu m to form color paste for later use, wherein the rotating speed is controlled to be 3000-3500 r/min, and the grinding temperature is less than 40 ℃;
(3) and (3) taking a new reaction tank, sequentially adding the aqueous hydroxyl acrylic acid dispersoid I and the hydroxyl acrylic acid dispersoid II according to the weight parts under the stirring state, after uniformly stirring, sequentially adding the pH regulator, the film-forming assistant, the wetting agent, the flatting agent, the silicon-free defoaming agent, the silane coupling agent, the antioxidant and the flash rust inhibitor, then adding the color paste prepared in the step (2), finally adding the thickening agent, and uniformly stirring to obtain the component A.
Preparation of component B:
taking a reaction tank, ensuring that the tank is anhydrous, sequentially adding the isocyanate curing agent I, the isocyanate curing agent II and the cosolvent according to parts by weight, and uniformly stirring to obtain the component B.
The construction method comprises the following steps: fully and uniformly stirring the component A and the component B according to the mass ratio of 4:1, then diluting with deionized water, and spraying after coating for 50-70s in a-4 cup.
The invention has the beneficial effects that:
(1) the two-component coating provided by the invention adjusts the gloss and the fullness by blending two water-based hydroxyl acrylic acids with different characteristics, and improves the tolerance and the application property (activation period) of the coating by blending isocyanate curing agents with different characteristics. The heat resistance of the coating is improved by adding an antioxidant, and the adhesion and water resistance are improved by adding a silane coupling agent. At present, the application of improving the product performance by adding an antioxidant and a silane coupling agent is not available in the market.
(2) The two-component coating disclosed by the invention has the advantages of high gloss, high fullness and small fog shadow, and solves the problems of low performance and poor appearance of a water-based coating.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The aqueous hydroxyl acrylic acid dispersoid I is Bayer-2470;
the aqueous hydroxyl acrylic acid dispersoid II is Bayer-2646;
the water-based organic silicon defoaming agent is BYK-024;
the silicon-free defoaming agent is BYK-011;
the flatting agent is TEGO-100;
the dispersant is TEGO-750W;
the wetting agent is TEGO-4100;
the silane coupling agent is MP 200;
the antioxidant is 340 DW;
the flash rust inhibitor is hamming-179;
the thickener is Haimines-299;
the isocyanate curing agent I is Kostew-2655;
the isocyanate curing agent II is Kostew-3900;
other raw materials in the invention are all commercial products.
Example 1
The water-based high-gloss two-component acrylic polyurethane coating comprises the following components in parts by weight:
and (2) component A: 40 parts of aqueous hydroxy acrylic acid dispersoid, 20 parts of aqueous hydroxy acrylic acid dispersoid II, 0.2 part of N, N-dimethylethanolamine I, 1 part of dispersing agent, 0.1 part of bentonite, 0.2 part of organic silicon defoamer, 22 parts of titanium dioxide, 0.2 part of N, N-dimethylethanolamine II, 2 parts of ethylene glycol butyl ether, 0.3 part of wetting agent, 0.3 part of flatting agent, 0.2 part of silicon-free defoamer, 0.3 part of silane coupling agent, 0.5 part of antioxidant, 8 parts of deionized water, 0.2 part of flash rust inhibitor and 0.2 part of thickening agent.
And (B) component: 50.4 parts of isocyanate curing agent I, 21.6 parts of isocyanate curing agent II and 7 parts of propylene glycol diacetate.
The preparation of the water-based highlight double-component acrylic polyurethane coating comprises the following steps:
preparation of component A:
(1) controlling the rotating speed to be 800-1000 r/min in parts by weight, sequentially adding 8 parts of deionized water, 0.2 part of N, N-dimethylethanolamine I, 1 part of dispersing agent, 0.1 part of bentonite, 0.2 part of organic silicon defoaming agent and 22 parts of titanium dioxide into a reaction tank under the stirring state, dispersing for 20min, and uniformly mixing to form a mixed solution for later use;
(2) grinding the mixed liquid in the step (1) until the fineness is less than 20 mu m to form color paste for later use, wherein the rotating speed is controlled to be 3000-3500 r/min, and the grinding temperature is less than 40 ℃;
(3) taking a new reaction tank, sequentially adding 40 parts of aqueous hydroxy acrylic acid dispersoid I and 20 parts of hydroxy acrylic acid dispersoid II according to parts by weight under the stirring state, after uniformly stirring, sequentially adding 0.2 part of N, N-dimethylethanolamine II, 2 parts of butyl cellosolve, 0.3 part of wetting agent, 0.3 part of flatting agent, 0.2 part of silicon-free defoaming agent, 0.3 part of silane coupling agent, 0.5 part of antioxidant and 0.2 part of flash rust inhibitor, then adding the color paste prepared in the step (2), finally adding 0.2 part of thickening agent, and uniformly stirring to obtain the component A.
Preparation of component B:
taking a reaction tank, ensuring that the tank is anhydrous, sequentially adding 50.4 parts of isocyanate curing agent I, 21.6 parts of isocyanate curing agent II and 7 parts of propylene glycol diacetate according to parts by weight, and uniformly stirring to obtain a component B.
The construction method comprises the following steps: fully and uniformly stirring the component A and the component B according to the mass ratio of 4:1, then diluting with deionized water, and spraying after coating for 50-70s in a-4 cup.
Example 2
The water-based high-gloss two-component acrylic polyurethane coating comprises the following components in parts by weight:
and (2) component A: 40 parts of aqueous hydroxy acrylic acid dispersoid, 20 parts of aqueous hydroxy acrylic acid dispersoid II, 0.2 part of N, N-dimethylethanolamine I, 1 part of dispersing agent, 0.1 part of bentonite, 0.2 part of organic silicon defoamer, 22 parts of titanium dioxide, 0.2 part of N, N-dimethylethanolamine II, 2 parts of ethylene glycol butyl ether, 0.3 part of wetting agent, 0.3 part of flatting agent, 0.2 part of silicon-free defoamer, 0.3 part of silane coupling agent, 8 parts of deionized water, 0.2 part of flash rust inhibitor and 0.2 part of thickening agent.
And (B) component: 50.4 parts of isocyanate curing agent I, 21.6 parts of isocyanate curing agent II and 7 parts of propylene glycol diacetate.
The preparation of the water-based highlight double-component acrylic polyurethane coating comprises the following steps:
preparation of component A:
(1) controlling the rotating speed to be 800-1000 r/min in parts by weight, sequentially adding 8 parts of deionized water, 0.2 part of N, N-dimethylethanolamine I, 1 part of dispersing agent, 0.1 part of bentonite, 0.2 part of organic silicon defoaming agent and 22 parts of titanium dioxide into a reaction tank under the stirring state, dispersing for 20min, and uniformly mixing to form a mixed solution for later use;
(2) grinding the mixed liquid in the step (1) until the fineness is less than 20 mu m to form color paste for later use, wherein the rotating speed is controlled to be 3000-3500 r/min, and the grinding temperature is less than 40 ℃;
(3) taking a new reaction tank, sequentially adding 40 parts of aqueous hydroxy acrylic acid dispersoid I and 20 parts of hydroxy acrylic acid dispersoid II according to parts by weight under the stirring state, after uniformly stirring, sequentially adding 0.2 part of N, N-dimethylethanolamine II, 2 parts of butyl cellosolve, 0.3 part of wetting agent, 0.3 part of flatting agent, 0.2 part of silicon-free defoaming agent, 0.3 part of silane coupling agent and 0.2 part of flash rust inhibitor, then adding the color paste prepared in the step (2), finally adding 0.2 part of thickening agent, and uniformly stirring to obtain the component A.
Preparation of component B:
taking a reaction tank, ensuring that the tank is anhydrous, sequentially adding 50.4 parts of isocyanate curing agent I, 21.6 parts of isocyanate curing agent II and 7 parts of propylene glycol diacetate according to parts by weight, and uniformly stirring to obtain a component B.
The construction method comprises the following steps: fully and uniformly stirring the component A and the component B according to the mass ratio of 4:1, then diluting with deionized water, and spraying after coating for 50-70s in a-4 cup.
Example 3
The water-based high-gloss two-component acrylic polyurethane coating comprises the following components in parts by weight:
and (2) component A: 20 parts of aqueous hydroxy acrylic acid dispersoid, 40 parts of aqueous hydroxy acrylic acid dispersoid II, 0.2 part of N, N-dimethylethanolamine I, 1 part of dispersing agent, 0.1 part of bentonite, 0.2 part of organic silicon defoamer, 22 parts of titanium dioxide, 0.2 part of N, N-dimethylethanolamine II, 2 parts of ethylene glycol butyl ether, 0.3 part of wetting agent, 0.3 part of flatting agent, 0.2 part of silicon-free defoamer, 0.3 part of silane coupling agent, 0.5 part of antioxidant, 8 parts of deionized water, 0.2 part of flash rust inhibitor and 0.2 part of thickening agent.
And (B) component: 50.4 parts of isocyanate curing agent I, 21.6 parts of isocyanate curing agent II and 7 parts of propylene glycol diacetate.
The preparation of the water-based highlight double-component acrylic polyurethane coating comprises the following steps:
preparation of component A:
(1) controlling the rotating speed to be 800-1000 r/min in parts by weight, sequentially adding 8 parts of deionized water, 0.2 part of N, N-dimethylethanolamine I, 1 part of dispersing agent, 0.1 part of bentonite, 0.2 part of organic silicon defoaming agent and 22 parts of titanium dioxide into a reaction tank under the stirring state, dispersing for 20min, and uniformly mixing to form a mixed solution for later use;
(2) grinding the mixed liquid in the step (1) until the fineness is less than 20 mu m to form color paste for later use, wherein the rotating speed is controlled to be 3000-3500 r/min, and the grinding temperature is less than 40 ℃;
(3) taking a new reaction tank, sequentially adding 40 parts of aqueous hydroxy acrylic acid dispersoid I and 20 parts of hydroxy acrylic acid dispersoid II according to parts by weight under the stirring state, after uniformly stirring, sequentially adding 0.2 part of N, N-dimethylethanolamine II, 2 parts of butyl cellosolve, 0.3 part of wetting agent, 0.3 part of flatting agent, 0.2 part of silicon-free defoaming agent, 0.3 part of silane coupling agent, 0.5 part of antioxidant and 0.2 part of flash rust inhibitor, then adding the color paste prepared in the step (2), finally adding 0.2 part of thickening agent, and uniformly stirring to obtain the component A.
Preparation of component B:
taking a reaction tank, ensuring that the tank is anhydrous, sequentially adding 50.4 parts of isocyanate curing agent I, 21.6 parts of isocyanate curing agent II and 7 parts of propylene glycol diacetate according to parts by weight, and uniformly stirring to obtain a component B.
The construction method comprises the following steps: fully and uniformly stirring the component A and the component B according to the mass ratio of 4:1, then diluting with deionized water, and spraying after coating for 50-70s in a-4 cup.
Example 4
The water-based high-gloss two-component acrylic polyurethane coating comprises the following components in parts by weight:
and (2) component A: 40 parts of aqueous hydroxy acrylic acid dispersoid, 20 parts of aqueous hydroxy acrylic acid dispersoid II, 0.2 part of N, N-dimethylethanolamine I, 1 part of dispersing agent, 0.1 part of bentonite, 0.2 part of organic silicon defoamer, 22 parts of titanium dioxide, 0.2 part of N, N-dimethylethanolamine II, 2 parts of ethylene glycol butyl ether, 0.3 part of wetting agent, 0.3 part of flatting agent, 0.2 part of silicon-free defoamer, 0.5 part of antioxidant, 8 parts of deionized water, 0.2 part of flash rust inhibitor and 0.2 part of thickening agent.
And (B) component: 50.4 parts of isocyanate curing agent I, 21.6 parts of isocyanate curing agent II and 7 parts of propylene glycol diacetate.
The preparation of the water-based highlight double-component acrylic polyurethane coating comprises the following steps:
preparation of component A:
(1) controlling the rotating speed to be 800-1000 r/min in parts by weight, sequentially adding 8 parts of deionized water, 0.2 part of N, N-dimethylethanolamine I, 1 part of dispersing agent, 0.1 part of bentonite, 0.2 part of organic silicon defoaming agent and 22 parts of titanium dioxide into a reaction tank under the stirring state, dispersing for 20min, and uniformly mixing to form a mixed solution for later use;
(2) grinding the mixed liquid in the step (1) until the fineness is less than 20 mu m to form color paste for later use, wherein the rotating speed is controlled to be 3000-3500 r/min, and the grinding temperature is less than 40 ℃;
(3) taking a new reaction tank, sequentially adding 40 parts of aqueous hydroxy acrylic acid dispersoid I and 20 parts of hydroxy acrylic acid dispersoid II according to parts by weight under the stirring state, after uniformly stirring, sequentially adding 0.2 part of N, N-dimethylethanolamine II, 2 parts of butyl cellosolve, 0.3 part of wetting agent, 0.3 part of flatting agent, 0.2 part of silicon-free defoaming agent, 0.5 part of antioxidant and 0.2 part of anti-flash rust agent, then adding the color paste prepared in the step (2), finally adding 0.2 part of thickening agent, and uniformly stirring to obtain the component A.
Preparation of component B:
taking a reaction tank, ensuring that the tank is anhydrous, sequentially adding 50.4 parts of isocyanate curing agent I, 21.6 parts of isocyanate curing agent II and 7 parts of propylene glycol diacetate according to parts by weight, and uniformly stirring to obtain a component B.
The construction method comprises the following steps: fully and uniformly stirring the component A and the component B according to the mass ratio of 4:1, then diluting with deionized water, and spraying after coating for 50-70s in a-4 cup.
Comparative example 1
A water-based double-component acrylic polyurethane coating comprises the following components in parts by weight:
and (2) component A: 60 parts of water-based hydroxyl acrylic acid dispersoid II, 0.4 part of N, N-dimethylethanolamine I, 1 part of dispersing agent, 0.1 part of bentonite, 0.2 part of organic silicon defoamer, 22 parts of titanium pigment, 0.3 part of N, N-dimethylethanolamine II, 3 parts of ethylene glycol butyl ether, 0.3 part of wetting agent, 0.3 part of flatting agent, 0.2 part of silicon-free defoamer, 12 parts of deionized water, 0.2 part of flash rust inhibitor and 0.2 part of thickening agent.
And (B) component: 70 parts of isocyanate curing agent II and 30 parts of propylene glycol diacetate.
The preparation method of the water-based double-component acrylic polyurethane coating comprises the following steps:
preparation of component A:
(1) controlling the rotating speed to be 800-1000 r/min in parts by weight, sequentially adding 12 parts of deionized water, 0.3 part of N, N-dimethylethanolamine I, 1 part of dispersing agent, 0.1 part of bentonite, 0.2 part of organic silicon defoaming agent and 22 parts of titanium dioxide into a reaction tank under the stirring state, dispersing for 20min, and uniformly mixing to form a mixed solution for later use;
(2) grinding the mixed liquid in the step (1) until the fineness is less than 20 mu m to form color paste for later use, wherein the rotating speed is controlled to be 3000-3500 r/min, and the grinding temperature is less than 40 ℃;
(3) taking a new reaction tank, sequentially adding 60 parts by weight of aqueous hydroxy acrylic acid dispersoid II under the stirring state, after uniformly stirring, sequentially adding 0.2 part by weight of N, N-dimethylethanolamine II, 3 parts by weight of butyl cellosolve, 0.3 part by weight of wetting agent, 0.3 part by weight of flatting agent, 0.2 part by weight of silicon-free defoaming agent and 0.2 part by weight of flash rust inhibitor, then adding the color paste prepared in the step (2), finally adding 0.2 part by weight of thickening agent, and uniformly stirring to obtain the component A.
Preparation of component B:
taking a reaction tank, ensuring that the tank is anhydrous, sequentially adding 70 parts by weight of isocyanate curing agent II and 30 parts by weight of propylene glycol diacetate, and uniformly stirring to obtain a component B.
The construction method comprises the following steps: fully and uniformly stirring the component A and the component B according to the mass ratio of 4:1, then diluting with deionized water, and spraying after coating for 50-70s in a-4 cup.
The products prepared in example 1, example 2, example 3, example 4 and comparative example 1 were tested and the test results are shown in table 1 below:
TABLE 1 results of the measurements
As can be seen from the above table, the product of the invention has the advantages of high fullness, high gloss, good water resistance, high hardness, good heat resistance and the like, and the best effect is obtained in example 1.
Although the present invention has been described in detail by way of preferred embodiments, the present invention is not limited thereto. Various equivalent modifications or substitutions can be made on the embodiments of the present invention by those skilled in the art without departing from the spirit and scope of the present invention, and these modifications or substitutions are within the scope of the present invention/any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. The water-based high-gloss two-component acrylic polyurethane coating is characterized by comprising a component A and a component B, wherein,
the component A comprises the following components in parts by weight: 20-40 parts of an aqueous hydroxy acrylic acid dispersion I, 20-40 parts of an aqueous hydroxy acrylic acid dispersion II, 0-0.5 part of a pH regulator, 1-5 parts of a conventional auxiliary agent, 1-6 parts of a film-forming auxiliary agent, 1-25 parts of a pigment and filler, 0-1.5 parts of a special auxiliary agent, 0.1-0.5 part of bentonite, 5-20 parts of deionized water, 0-1 part of a flash rust inhibitor and 0-1 part of a thickening agent;
the component B comprises the following components in parts by weight: 20-70 parts of isocyanate curing agent I, 20-70 parts of isocyanate curing agent II and 0-30 parts of cosolvent.
2. The aqueous high-gloss two-component acrylic polyurethane coating of claim 1, comprising the following components in parts by weight:
and (2) component A: 30-40 parts of an aqueous hydroxyl acrylic dispersion I, 20-30 parts of an aqueous hydroxyl acrylic dispersion II, 0.2-0.5 part of a pH regulator, 2-5 parts of a conventional auxiliary agent, 2-5 parts of a film forming auxiliary agent, 2-25 parts of a pigment filler, 0.1-1.5 parts of a special auxiliary agent, 0.1-0.3 part of bentonite, 6-15 parts of deionized water, 0.1-1 part of a flash rust inhibitor and 0.1-1 part of a thickening agent;
and (B) component: 20-60 parts of isocyanate curing agent I, 20-40 parts of isocyanate curing agent II and 10-30 parts of cosolvent.
3. The aqueous high gloss two-component acrylic polyurethane coating of claim 1, wherein the aqueous hydroxyl acrylic dispersion I is Bayer-2470, the hydroxyl content is 3.9%, and the solid content is 44-47%.
4. The aqueous high gloss two-component acrylic polyurethane coating of claim 1, wherein the aqueous hydroxyl acrylic dispersion II is Bayer-2646, the hydroxyl content is 3.5-4.0%, and the solid content is 40-50%.
5. The aqueous high gloss two-component acrylic polyurethane coating of claim 1, wherein the pH adjusting agent is one or both of N, N-dimethylethanolamine or isobutanol amine.
6. The aqueous high-gloss two-component acrylic polyurethane coating of claim 1, wherein the conventional additives are a combination of several of an aqueous silicone defoamer, a silicon-free defoamer, a leveling agent, a dispersant and a wetting agent, wherein the aqueous silicone defoamer is of BYK-024 type, the silicon-free defoamer is of BYK-011 type, the leveling agent is of TEGO-100 type, the dispersant is of TEGO-750W type, and the wetting agent is of TEGO-4100 type.
7. The aqueous highlight double-component acrylic polyurethane coating according to claim 1, wherein the film forming aid is an ether or alcohol ester film forming material, specifically one or a combination of ethylene glycol butyl ether, dipropylene glycol methyl ether, dipropylene glycol butyl ether, diethylene glycol butyl ether and alcohol ester twelve.
8. The aqueous high-gloss two-component acrylic polyurethane coating according to claim 1, wherein the pigment and filler is one or more of carbon black, iron oxide red, phthalocyanine blue, phthalocyanine green, iron oxide yellow, titanium white pigment and barium sulfate.
9. The aqueous high-gloss two-component acrylic polyurethane coating as claimed in claim 1, wherein the special auxiliary agent is a silane coupling agent and an antioxidant, and the silane coupling agent is MP 200; the model of the antioxidant is 340 DW;
further preferably, the anti-flash rust agent is one or a combination of more of nitrite, borate and phosphate;
more preferably, the thickening agent is a polyurethane thickening agent with the model number of Haimines-299;
more preferably, the isocyanate curing agent I is hydrophilic aliphatic isocyanate which is Corsia-2655, the solid content is 100%, and the NCO content is 20.0-22.0%;
more preferably, the isocyanate curing agent II is hydrophilic aliphatic isocyanate which is Corsikon-3900, the solid content is 100%, and the NCO content is 23.5 +/-0.5%;
further preferably, the cosolvent is propylene glycol diacetate.
10. The preparation method of the water-based high-gloss two-component acrylic polyurethane coating comprises the following specific steps:
preparation of component A:
(1) controlling the rotating speed to be 800-1000 r/min in parts by weight, sequentially adding deionized water, a pH regulator, a dispersing agent, bentonite, an organic silicon defoaming agent and pigment and filler into a reaction tank under a stirring state, dispersing for 20min, and uniformly mixing to form a mixed solution for later use;
(2) grinding the mixed liquid in the step (1) until the fineness is less than 20 mu m to form color paste for later use, wherein the rotating speed is controlled to be 3000-3500 r/min, and the grinding temperature is less than 40 ℃;
(3) taking a new reaction tank, sequentially adding the aqueous hydroxyl acrylic acid dispersoid I and the hydroxyl acrylic acid dispersoid II according to the weight parts under the stirring state, after uniformly stirring, sequentially adding the pH regulator, the film-forming assistant, the wetting agent, the flatting agent, the silicon-free defoaming agent, the silane coupling agent, the antioxidant and the flash rust inhibitor, then adding the color paste prepared in the step (2), finally adding the thickening agent, and uniformly stirring to obtain a component A;
preparation of component B:
taking a reaction tank, ensuring that the tank is anhydrous, sequentially adding the isocyanate curing agent I, the isocyanate curing agent II and the cosolvent according to parts by weight, and uniformly stirring to obtain the component B.
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| CN201911303820.7A CN110922878A (en) | 2019-12-17 | 2019-12-17 | Water-based high-gloss two-component acrylic polyurethane coating and preparation method thereof |
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| CN201911303820.7A CN110922878A (en) | 2019-12-17 | 2019-12-17 | Water-based high-gloss two-component acrylic polyurethane coating and preparation method thereof |
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