CN113683915A - Solvent composition, water-based two-component polyurethane finish paint, and preparation method and application thereof - Google Patents
Solvent composition, water-based two-component polyurethane finish paint, and preparation method and application 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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/20—Diluents or solvents
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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
Abstract
The invention belongs to the technical field of coatings, and particularly discloses a solvent composition, a water-based double-component polyurethane finish paint, and a preparation method and application thereof, wherein the solvent composition comprises DAA, MMB, propylene glycol and propylene ketal glycerin, and the mass ratio of diacetone alcohol, 3-methoxy-3-methyl-1-butyl ester, propylene glycol and propylene ketal glycerin is (1-3) to (0-1) to (1-2). The water-based two-component polyurethane finish paint comprises a component A and a component B; the component A comprises a waterborne hydroxyl acrylic acid dispersoid and a solvent composition, and the component B is a waterborne curing agent. The preparation method comprises the following steps: grinding, dispersing and filtering the raw materials of the component A to obtain the component A; mixing the raw materials of the component B, and filtering to obtain the component B. Can be constructed in the extreme environment of high temperature and low humidity, still can keep the effects of high gloss and high fullness of a paint film and good mechanical property and protective property.
Description
Technical Field
The invention belongs to the technical field of coatings, and particularly relates to a solvent composition, a water-based double-component polyurethane finish paint, and a preparation method and application thereof.
Background
The water-based double-component polyurethane coating consists of water-based hydroxyl resin and a water-based polyisocyanate curing agent, has the advantages of excellent chemical resistance, good wear resistance, excellent hand feeling, high hardness, high construction solid content and the like, simultaneously takes water as a dispersion medium, has extremely low VOC (volatile organic compounds), and is a high-performance environment-friendly coating which is widely adopted.
The existing water-based two-component polyurethane finish paint can realize high gloss of a paint film and has good comprehensive performance, but has high requirements on construction conditions and cannot adapt to extreme construction environments with high temperature and low humidity. When construction is carried out in summer, extreme difference weather of high temperature and low humidity often occurs, for example, the temperature exceeds 30 ℃ and even reaches more than 40 ℃, and the relative humidity of the environment is lower than 35% RH and even reaches 10% RH, so that the appearance and the performance of a paint film of the water-based paint are obviously affected by difference, and the construction of the high-gloss water-based paint is greatly challenged. The change of the temperature and the humidity of the coating environment causes the solvent volatilization gradient formed by a cosolvent system and water in a paint film to be influenced; under the condition of low humidity, the moisture in the paint film is completely volatilized, so that the surface of the paint film is dried quickly, the residual cosolvent cannot be volatilized to form fog images on the surface of the paint film, and the luster of the paint film is influenced.
Therefore, it is highly desirable to develop a high-gloss water-based two-component polyurethane finish paint suitable for construction in high-temperature and low-humidity environments to reduce the requirements of the high-gloss water-based two-component polyurethane finish paint on construction environments.
Disclosure of Invention
The invention provides a solvent composition, a water-based two-component polyurethane finish paint, and a preparation method and application thereof, which are used for solving one or more technical problems in the prior art and providing at least one beneficial choice or creation condition.
The invention has the following inventive concept: by selecting four solvent compositions of diacetone alcohol (DAA), 3-methoxy-3-methyl-1-butanol (MMB), propylene glycol and acetone glycerin acetal (Augeo SL 191) as the solvents of the component A of the waterborne two-component polyurethane finish paint, the solvents and the mutual synergistic action thereof are fully utilized, and the specific mass ratio among the four solvents is controlled, so that the waterborne two-component polyurethane finish paint can be constructed in extreme environments of high temperature (the environmental temperature is 30-42 ℃) and low humidity (the environmental relative temperature is less than 35% RH), the high gloss and high fullness of a paint film can be still maintained, and the mechanical property and the protective property are good.
To overcome the above technical problems, the first aspect of the present invention provides a solvent composition.
A solvent composition comprises DAA, MMB, propylene glycol and Augeo SL 191, wherein the mass ratio of diacetone alcohol, 3-methoxy-3-methyl-1-butyl ester, propylene glycol and Augeo SL 191 is (1-3): 0-1): 1-2.
Specifically, the DAA has good compatibility with water, the boiling point is 168 ℃, when the DAA is used as a solvent, the problem of paint film explosion under the condition of quick baking and quick baking of the water-based two-component polyurethane finish paint can be solved, moisture can be completely carried out after baking and escaped together, the actual drying of the paint film is not influenced, and the gloss stability of the paint film under the conditions of high temperature and low humidity is ensured. The MMB molecules simultaneously have hydroxyl and methoxyl, so that strong hydrogen bonds are formed in the molecules and among the molecules, and the MMB shows amphiphilic medium property, namely the MMB is dissolved in water (polar solvent) and oil (nonpolar solvent); and the MMB/water system has no phase separation between 0 ℃ and the boiling point, so that the surface drying speed of the paint film in a wet film state can be delayed to a certain degree, the paint film can completely carry water to escape after being baked, the actual drying of the paint film is not influenced, and the gloss stability of the paint film under the conditions of high temperature and low humidity is further ensured. The main function of the propylene glycol in the solvent composition is to moisturize and enhance the surface drying speed of the paint film in a wet film state on the outermost surface layer of the finish paint before baking in an extremely high-temperature and low-humidity environment, so that the cosolvent and water in the inner layer can have enough time to volatilize and supplement the function of MMB, but the dosage of the propylene glycol is not too much, and the main reason is that: the propylene glycol contains alcoholic hydroxyl, so that the curing performance of the isocyanate curing agent is easily consumed; and simultaneously influences the actual dryness of the paint film. The boiling point of SL-191 is 191 ℃, the leveling property of a wet film of a paint film is improved, the problem of paint film explosion under the condition that the water-based two-component polyurethane finish paint is baked quickly is prevented, and the reinforcing effect on the explosion-proof effect of the DAA solvent is achieved. Meanwhile, experiments prove that the mass ratio of the four solvents of DAA, MMB, propylene glycol and Augeo SL 191 is (1-3) to (0-1) to (1-2), when the solvent is used as the solvent of the component A of the waterborne two-component polyurethane finish paint, the solvents are mutually synergistic, and the prepared finish paint can meet the requirements of high glossiness and excellent comprehensive performance of a paint film after being coated in a high-temperature low-humidity environment.
Preferably, the mass ratio of the diacetone alcohol, the 3-methoxy-3-methyl-1-butyl ester, the propylene glycol and the Augeo SL 191 is (1.5-2): (2-2.5): (0-0.5): (1-1.5).
In a second aspect of the invention, a waterborne two-component polyurethane topcoat is provided.
A water-based two-component polyurethane finish paint comprises a component A and a component B; the component A comprises a waterborne hydroxyl acrylic acid dispersoid and the solvent composition, and the component B is a waterborne curing agent.
As a further improvement of the above aspect, the aqueous hydroxyacrylic dispersion includes a primary dispersion and a secondary dispersion; the hydroxyl content of the primary dispersion is 1.5-2.5 wt%, and the hydroxyl content of the secondary dispersion is 2.5-4 wt%; the mass ratio of the primary dispersion to the secondary dispersion is 1: (0.8-5).
Specifically, the medium, low and high hydroxyl resin is classified by taking the hydroxyl content of the resin as a classification, wherein 0-2.5 wt% of the hydroxyl is low hydroxyl, 2.5-4.0 wt% of the hydroxyl is medium hydroxyl, and more than 4.0 wt% of the hydroxyl is high hydroxyl, the higher the hydroxyl value of the resin is, the more the isocyanate curing agent is matched with the resin, the larger the crosslinking density of the paint film is, the better the performance is, and the more the product price is, the more expensive the product is. Conversely, the resin has a low hydroxyl value and a high surface drying speed, and the higher the hydroxyl value, the slower the surface drying speed. The hydroxyl content of the secondary dispersion is limited to 2.5-4 wt%, and on one hand, the requirement of the comprehensive performance of the product is met mainly by the crosslinking performance provided by the medium-hydroxyl secondary dispersion resin; on the other hand, the secondary dispersion with medium hydroxyl value has better surface drying speed and gloss stability performance than the primary dispersion.
The primary dispersion is used for controlling the surface drying speed of the finish paint and the glossiness of a dried paint film in cooperation with the secondary dispersion so as to adapt to the high-temperature and low-humidity construction conditions. Meanwhile, the hydroxyl content of the primary dispersion is limited to 1.5-2.5 wt%, and when the hydroxyl value is lower than the range, the crosslinking density is low, the protective performance is poor, and the overall protective performance of the finish paint is reduced; above this range is the primary dispersion of medium hydroxyl groups, which is detrimental to the top-coat speed and gloss of the dried film.
Meanwhile, the mass ratio of the secondary dispersion to the primary dispersion is controlled to be 1: (0.8-5), on the basis of ensuring the product performance, the paint can adapt to the high-temperature and low-humidity construction environment, and the glossiness of a paint film is ensured, and experiments prove that the mass ratio of the secondary dispersion to the primary dispersion exceeds 1: (0.8-5), the paint film performance and appearance are affected to a certain extent, and the glossiness of the finish paint constructed in a high-temperature low-humidity environment is particularly reduced.
Preferably, the secondary dispersion is selected from one or more of WA839 of Guangzhou Jia Fucheng trade company, Inc., KT-8473 of Guangzhou Zhou dynasty new material, Inc., PA-4823 of Guangzhou New Material science and technology, Inc.
Preferably, the primary dispersion is selected from one or more of KT-8470 from Guangzhou province new material company Limited, AQUAPAC-8219 from Richardson, TG-AD543 from Beijing Sun Vigordon environmental protection technology company Limited, WA 819 from Guangzhou Jiafu Chengxi trade company Limited, KT-8470 from Guangzhou province new material company Limited, KT8473, AQUAPAC-8219 from Richardson, EA128 from Jiangsu Sanmu group company Limited, and TG-AD543 from Beijing Sun Vigordon environmental protection technology company Limited.
As a further improvement of the above aspect, the aqueous curing agent includes a water-dispersible polyisocyanate and a co-solvent.
As a further improvement of the above aspect, the water-dispersible polyisocyanate includes Hexamethylene Diisocyanate (HDI) -based water-dispersible polyisocyanate and isophorone diisocyanate (IPDI) -based water-dispersible polyisocyanate; the mass ratio of the HDI-based water-dispersible polyisocyanate to the IPDI-based water-dispersible polyisocyanate is (2-5): 1.
specifically, the HDI-based water-dispersible polyisocyanate and IPDI-based water-dispersible polyisocyanate are selected as the composite curing agent, wherein: HDI is a main cross-linking agent for curing a paint film and is used for mainly ensuring the appearance and the mechanical property of the paint film, IPDI is used for improving the gloss and the fullness of the paint film, the specific mass ratio of the HDI to the IPDI is controlled, the comprehensive effect of the HDI and the IPDI is exerted, the gloss of the paint film is improved, the appearance and the mechanical property of the paint film are ensured, and the impact property of the paint film in the later use stage is prevented from being reduced.
Preferably, the HDI-based water-dispersible polyisocyanate is selected from WT31-100 and/or WL 72-100.
Preferably, the IPDI-based water-dispersible polyisocyanate is selected from any one or more of Uahard3597A, s401 and OS-9018.
Preferably, the cosolvent is selected from any one or more of ethylene glycol diacetate, ethylene glycol methyl ether acetate, propylene glycol methyl ether acetate and mixed dibasic acid ester.
As a further improvement of the scheme, the component A also comprises at least one of water-based auxiliary agents, pigments, fillers and deionized water.
Preferably, the aqueous auxiliary agent comprises at least one of a wetting agent, a dispersing agent, a leveling agent, a thickening agent and a defoaming agent. The auxiliary agents mainly play respective effects, and further improve the performances of wetting, dispersing, leveling, thickening, defoaming and the like of the finish paint.
Preferably, the dispersant is selected from BGF 1150,
IV 1711, DW-431, DW-SOL20000, PL 30, Dispersogen4387, FX 605 and FN 267.
Preferably, the wetting and leveling agent is selected from one or more of BITRIZE YB 084, BITRIZE YB427, DW-311, Zonyl 9361, CoatOsil1211, LHFF 4821 and HX-5600.
Preferably, the defoaming agent is selected from BYKAQ,
IV-3267、
One or more of IV-336, SNL-GT3, Defom097, EFKA-2526 and AC-202.
Preferably, the thickener is selected from
Gel0626、
One or more of Gel THIX921, TK 530, DT-504 and U501.
Preferably, the pigment and filler are selected from general-purpose 200 ℃ and above baking heat stable pigments or fillers, as long as they can ensure the stability of baking at 200 ℃ and do not affect the reaction of the water-based hydroxyl acrylic resin and the isocyanate curing agent, and the invention is not limited thereto.
Preferably, the pigment and the filler can adopt one or more of carbon black, barium sulfate, titanium dioxide and mica powder.
Preferably, the particle size of the filler is 3000-8000 meshes. Specifically, the addition of the filler has a negative influence on the gloss of a paint film, the smaller the particle size of the filler is, the smaller the influence on the gloss of the paint film is, the higher the requirement on the preparation process is, and the cost is increased, so that the preferred particle size of the filler is 3000-8000 meshes.
Preferably, the sun protection grade of the pigment is more than or equal to grade 5.
As a further improvement of the scheme, the water-based two-component polyurethane finish paint comprises the following components in parts by weight:
a component A:
b, component B:
10-15 parts of water-dispersible polyisocyanate;
and 2-5 parts of a cosolvent.
Specifically, the optimal proportioning relation among the raw materials is controlled, the raw materials are synergistic, so that the prepared water-based double-component polyurethane finish paint can still keep high gloss and high fullness of a paint film under a high-temperature and low-humidity construction environment, the mechanical property and the protective property are good, and the water-based double-component polyurethane finish paint which is not in the formula range cannot simultaneously meet the comprehensive performance of the finish paint.
In a third aspect of the invention, a method for preparing a water-based two-component polyurethane finish paint is provided.
Specifically, the preparation method of the water-based bi-component polyurethane finish paint comprises the following steps:
grinding, dispersing and filtering the raw materials of the component A to obtain the component A;
mixing the raw materials of the component B, and filtering to obtain the component B.
Preferably, the preparation method of the water-based two-component polyurethane finish paint comprises the following steps:
(1) uniformly stirring and dispersing the aqueous hydroxyl acrylic acid secondary dispersion, part of deionized water, a dispersing agent, pigments, fillers and part of defoaming agent, and grinding to obtain aqueous color paste;
(2) adding the aqueous hydroxyl acrylic acid primary dispersion, the rest deionized water, the solvent composition, the wetting agent, the leveling agent, the thickening agent and the rest defoaming agent into the aqueous color paste, stirring uniformly, and filtering to obtain a component A;
uniformly mixing the water dispersible polyisocyanate and the cosolvent according to the proportion, and filtering to obtain the component B.
Further, the fineness of the water-based color paste in the step (1) is less than or equal to 10 mu m.
Further, the stirring dispersion speed in the step (1) is 300-; the grinding speed is 5000-.
Further, the stirring speed in the step (2) is 500-600 rpm/min.
Further, in the step (2), the filtering is performed by a 300-mesh filter screen.
Further, the preparation temperature of the step (1) and the step (2) is controlled below 45 ℃.
The fourth aspect of the invention provides an application of a water-based two-component polyurethane finish paint.
Specifically, the water-based two-component polyurethane finish paint is applied to construction in a high-temperature and low-humidity environment, wherein the high-temperature environment temperature is 30-42 ℃, and the low-humidity environment relative temperature is less than 35% RH.
Compared with the prior art, the technical scheme of the invention at least has the following technical effects or advantages:
according to the invention, four solvent compositions of DAA, MMB, propylene glycol and Augeo SL 191 are selected as solvents of the component A of the waterborne two-component polyurethane finish paint, the solvents and the mutual synergistic effect of the solvents are fully utilized, and the specific mass ratio of the four solvents is controlled, so that a paint film with excellent comprehensive performance can be obtained under a normal construction environment (the environment temperature is 10-30 ℃, and the relative humidity is 35-85% RH); and can still maintain the effects of high gloss, high fullness, good mechanical properties and good protective properties of a paint film under an extreme construction environment (the environmental temperature is 30-42 ℃, and the relative temperature is less than 35% RH). When the paint is constructed in a high-temperature low-humidity environment, the 60-degree gloss of a paint film can reach over 90 degrees, and the paint film has good leveling property, hardness, impact strength and water resistance.
Detailed Description
The present invention is described in detail below by way of examples to facilitate understanding of the present invention by those skilled in the art, and it is to be specifically noted that the examples are provided only for the purpose of further illustrating the present invention and are not to be construed as limiting the scope of the present invention.
Example 1
A solvent composition comprising DAA, MMB, propylene glycol, and Augeo SL 191, wherein: the mass ratio of DAA, MMB, propylene glycol and Augeo SL 191 is 2: 2: 0.5: 1.
a water-based two-component polyurethane finish comprising a component A and a component B, wherein: the component A comprises an aqueous hydroxy acrylic acid dispersion and the solvent composition of the embodiment, and the component B is an aqueous curing agent. Comprises the following components in parts by weight:
a component A: 20.5 parts of aqueous hydroxy acrylic acid secondary dispersion; 23 parts of water-based hydroxy acrylic acid primary dispersion; 3.8 parts of water-based auxiliary agent (wherein, 2.2 parts of dispersant, 0.4 part of defoamer, 0.6 part of wetting agent, 0.5 part of thickener and 0.1 part of defoamer); 26 parts of pigment and filler; 5.5 parts of a solvent composition; 8.7 parts of deionized water. Wherein: the hydroxyl content of the primary dispersion was 2 wt% and the hydroxyl content of the secondary dispersion was 3 wt%.
B, component B: 7.2 parts of HDI-based water-dispersible polyisocyanate; 2.8 parts of IPDI-based water-dispersible polyisocyanate; 2.6 parts of cosolvent (1.3 parts of EGDA and 1.3 parts of DBE).
The aqueous hydroxyacrylic acid secondary dispersion used in this example WAs selected from WA839 from hocheng trade ltd, guangzhou, the aqueous hydroxyacrylic acid primary dispersion WAs selected from KT-8470 from guangzhou, new materials ltd, the dispersant WAs selected from BGF 1150, the wetting and leveling agent WAs selected from bitreze YB 084, the defoamer WAs selected from BYK AQ, and the thickener WAs selected from BYK AQ
Gel0626, pigment selected from carbon black, HDI-based water-dispersible polyisocyanate selected from WT31-100, IPDI-based water-dispersible polyisocyanate selected from Uahard 3597A.
A preparation method of a water-based two-component polyurethane finish paint comprises the following steps:
(1) preparation of a component A:
adding the aqueous hydroxyl acrylic acid secondary dispersion, the dispersing agent, 75% of the defoaming agent and 80% of the ionized water into a stirring tank according to the mass parts at room temperature, adjusting the rotating speed to 300rpm/min, and uniformly mixing; adding pigment and filler under the stirring condition, adjusting the rotating speed to 800rpm/min, stirring and dispersing for 15min, transferring to a sand mill after stirring uniformly, and grinding and dispersing until the fineness of the slurry is less than 10 mu m to obtain the water-based color paste.
Under the stirring at room temperature, mixing the water-based hydroxyl acrylic acid primary dispersion, the wetting leveling agent, the thickening agent, 25% of defoaming agent, the solvent composition and 20% of deionized water according to the mass parts with the obtained water-based color paste, stirring at 600rpm/min for 10min, filtering and packaging by using a 300-mesh filter screen.
(2) B, preparation of a component B:
and (3) uniformly stirring HDI type water-dispersible isocyanate, IPDI type water-dispersible isocyanate, a water-dispersible isocyanate curing agent and cosolvents EGDA and DBE in a stirring tank filled with nitrogen and isolated from air according to the mass parts, filtering and packaging to obtain the component B.
Example 2
A solvent composition comprising DAA, MMB, propylene glycol, and Augeo SL 191, wherein: the mass ratio of DAA, MMB, propylene glycol and Augeo SL 191 is 2: 2: 0.5: 2.
a water-based two-component polyurethane finish comprising a component A and a component B, wherein: the component A comprises an aqueous hydroxy acrylic acid dispersion and the solvent composition of the embodiment, and the component B is an aqueous curing agent. Comprises the following components in parts by weight:
a component A: 29 parts of aqueous hydroxy acrylic acid secondary dispersion; 14.5 parts of aqueous hydroxy acrylic acid primary dispersion; 4 parts of water-based auxiliary agent (wherein, 2.5 parts of dispersant, 0.4 part of defoamer, 0.5 part of wetting agent, 0.5 part of thickener and 0.1 part of defoamer); 26 parts of pigment and filler; 5.5 parts of a solvent composition; 8.2 parts of deionized water. Wherein: the hydroxyl content of the primary dispersion was 1.5% by weight and the hydroxyl content of the secondary dispersion was 4% by weight.
B, component B: 9.2 parts of HDI-based water-dispersible polyisocyanate; 2 parts of IPDI-based water-dispersible polyisocyanate; cosolvent EGDA1.7 parts.
The aqueous hydroxyacrylic secondary dispersion adopted in this example was selected from KT-8473 from New materials Ltd, the aqueous hydroxyacrylic primary dispersion was selected from AQUAPAC-8219 from Fuqisen, the dispersant was selected from DW-431, the wetting and leveling agent was selected from BITRIZE YB427, and the defoamer was selected from BITRIZE YB427
IV-3267, thickening agents selected from
Gel THIX921, the filler is selected from barium sulfate, HDI-based water-dispersible polyisocyanate is selected from WT31-100, and IPDI-based water-dispersible polyisocyanate is selected from Uahard 3597A.
A preparation method of a water-based two-component polyurethane finish paint comprises the following steps:
(1) preparation of a component A:
adding the aqueous hydroxyl acrylic acid secondary dispersion, the dispersing agent, 75% of the defoaming agent and 80% of deionized water into a stirring tank according to the mass parts at room temperature, adjusting the rotating speed to 300rpm/min, and uniformly mixing; adding pigment and filler under the stirring condition, adjusting the rotating speed to 1000rpm/min, stirring and dispersing for 15min, transferring to a sand mill after stirring uniformly, and grinding and dispersing until the fineness of the slurry is less than 10 mu m to obtain the water-based color paste.
Under the stirring at room temperature, mixing the water-based hydroxyl acrylic acid primary dispersion, the wetting leveling agent, the thickening agent, 25% of defoaming agent, the solvent composition and 20% of deionized water according to the mass parts with the obtained water-based color paste, stirring at 600rpm/min for 15min, filtering and packaging by using a 300-mesh filter screen.
(2) B, preparation of a component B:
and (3) uniformly stirring HDI type water-dispersible isocyanate, IPDI type water-dispersible isocyanate, a water-dispersible isocyanate curing agent and cosolvents EGDA and DBE in a stirring tank filled with nitrogen and isolated from air according to the mass parts, filtering and packaging to obtain the component B.
Example 3
A solvent composition comprising DAA, MMB, propylene glycol, and Augeo SL 191, wherein: the mass ratio of DAA, MMB, propylene glycol and Augeo SL 191 is 2: 2: 1: 2.
a water-based two-component polyurethane finish comprising a component A and a component B, wherein: the component A comprises an aqueous hydroxy acrylic acid dispersion and the solvent composition of the embodiment, and the component B is an aqueous curing agent. Comprises the following components in parts by weight:
a component A: 26 parts of aqueous hydroxy acrylic acid secondary dispersion; 17.5 parts of water-based hydroxy acrylic acid primary dispersion; 4 parts of water-based auxiliary agent (wherein, 2.5 parts of dispersant, 0.4 part of defoamer, 0.5 part of wetting agent, 0.5 part of thickener and 0.1 part of defoamer); 26 parts of pigment and filler; 5.5 parts of a solvent composition; 7 parts of deionized water. Wherein: the hydroxyl content of the primary dispersion was 2.5 wt.%, and the hydroxyl content of the secondary dispersion was 4.5 wt.%.
B, component B: 8.6 parts of HDI-based water-dispersible polyisocyanate; 2.3 parts of IPDI-based water-dispersible polyisocyanate; 3.2 parts of cosolvent EGDA (1.2 parts of EGDA, 0.8 part of DBE and 1.2 parts of BGA).
The aqueous secondary dispersion of hydroxyacrylic acid used in this example WAs selected from PA-4823 of Guangzhou New Material science and technology, Inc., the aqueous primary dispersion of hydroxyacrylic acid WAs selected from WA 819 of Khe Cheng trade, Inc., Guangzhou, and the dispersant WAs selected from
IV 1711, the wetting and leveling agent is selected from Zonyl 9361, and the defoaming agent is selected from
IV-336, the thickening agent is selected from TK 530, the filler is selected from titanium dioxide, HDI-based water-dispersible polyisocyanate is selected from WT31-100, and IPDI-based water-dispersible polyisocyanate is selected from Uahard 3597A.
A preparation method of a water-based two-component polyurethane finish paint comprises the following steps:
(1) preparation of a component A:
adding the aqueous hydroxyl acrylic acid secondary dispersion, the dispersing agent, 75% of defoaming agent and a proper amount of deionized water into a stirring tank according to the mass parts at room temperature, adjusting the rotating speed to 300rpm/min, and uniformly mixing; adding pigment and filler under the stirring condition, adjusting the rotating speed to 900rpm/min, stirring and dispersing for 12min, transferring to a sand mill after stirring uniformly, and grinding and dispersing until the fineness of the slurry is less than 10 mu m to obtain the water-based color paste.
Under the stirring at room temperature, mixing the water-based hydroxyl acrylic acid primary dispersion, the wetting leveling agent, the thickening agent, 0.1 part of defoaming agent, the solvent composition and 25 percent of deionized water according to the mass parts with the obtained water-based color paste, stirring at 600rpm/min for 12min, filtering and packaging by using a 300-mesh filter screen.
(2) B, preparation of a component B:
and (3) uniformly stirring HDI type water-dispersible isocyanate, IPDI type water-dispersible isocyanate, a water-dispersible isocyanate curing agent and cosolvents EGDA and DBE in a stirring tank filled with nitrogen and isolated from air according to the mass parts, filtering and packaging to obtain the component B.
Example 4
A solvent composition comprising DAA, MMB, propylene glycol, and Augeo SL 191, wherein: the mass ratio of DAA, MMB, propylene glycol and Augeo SL 191 is 1.5: 2.5: 0: 1.5.
a water-based two-component polyurethane finish comprising a component A and a component B, wherein: the component A comprises an aqueous hydroxy acrylic acid dispersion and the solvent composition of the embodiment, and the component B is an aqueous curing agent. Comprises the following components in parts by weight:
a component A: 20.5 parts of aqueous hydroxy acrylic acid secondary dispersion; 23 parts of water-based hydroxy acrylic acid primary dispersion; 3.8 parts of water-based auxiliary agent (wherein, 2.2 parts of dispersant, 0.4 part of defoamer, 0.6 part of wetting agent, 0.5 part of thickener and 0.1 part of defoamer); 26 parts of pigment and filler; 5.5 parts of a solvent composition; 8.7 parts of deionized water. Wherein: the hydroxyl content of the primary dispersion was 2 wt% and the hydroxyl content of the secondary dispersion was 4 wt%.
B, component B: 7.2 parts of HDI-based water-dispersible polyisocyanate; 2.8 parts of IPDI-based water-dispersible polyisocyanate; 2.6 parts of cosolvent EGDA (1.3 parts of EGDA and 1.3 parts of DBE).
The aqueous hydroxy acrylic acid secondary dispersion adopted in the embodiment is selected from WA839 of Fucheng trade company, Inc., Guangzhou, Heifu, China, Inc., the aqueous hydroxy acrylic acid primary dispersion is selected from KT-8470 of New Material, Inc., Guangzhou, China, the dispersant is selected from FX 605, the wetting and leveling agent is selected from LHFF 4821, the defoaming agent is selected from EFKA-2526, the thickening agent is selected from DT-504, the filler is selected from mica powder, the HDI-based water-dispersible polyisocyanate is selected from WL72-100, and the IPDI-based water-dispersible polyisocyanate is selected from OS-9018.
A preparation method of a water-based two-component polyurethane finish paint comprises the following steps:
(1) preparation of a component A:
adding the aqueous hydroxyl acrylic acid secondary dispersion, the dispersing agent, 75% of defoaming agent and a proper amount of deionized water into a stirring tank according to the mass parts at room temperature, adjusting the rotating speed to 300rpm/min, and uniformly mixing; adding pigment and filler under the stirring condition, adjusting the rotating speed to 1000rpm/min, stirring and dispersing for 10min, transferring to a sand mill after stirring uniformly, and grinding and dispersing until the fineness of the slurry is less than 10 mu m to obtain the water-based color paste.
And (2) under stirring at room temperature, mixing the water-based hydroxyl acrylic acid primary dispersion, the wetting leveling agent, the thickening agent, 25% of defoaming agent, the solvent composition and the rest deionized water with the obtained water-based color paste according to the mass parts, stirring at 600rpm/min for 15min, and filtering and packaging by using a 300-mesh filter screen.
(2) B, preparation of a component B:
and (3) uniformly stirring HDI type water-dispersible isocyanate, IPDI type water-dispersible isocyanate, a water-dispersible isocyanate curing agent and cosolvents EGDA and DBE in a stirring tank filled with nitrogen and isolated from air according to the mass parts, filtering and packaging to obtain the component B.
Comparative example 1
Comparative example 1 differs from example 1 in that the solvent in the a component of the waterborne two-component polyurethane topcoat in comparative example 1 was single dipropylene glycol butyl ether (DPnB), the component content of the solvent was 5.5 parts; the other components and the addition amount of the water-based two-component polyurethane finish paint and the preparation method of the water-based two-component polyurethane finish paint are the same as those of the example 1.
Comparative example 2
Comparative example 2 differs from example 1 in that the solvent composition in the A component of the waterborne two-component polyurethane topcoat of comparative example 2 comprises DPnB and dipropylene glycol methyl ether (DPM), wherein: the mass ratio of DPnB to DPM is 9: 5, adding 7 parts of solvent composition; the other components and the addition amount of the water-based two-component polyurethane finish paint and the preparation method of the water-based two-component polyurethane finish paint are the same as those of the example 1.
Comparative example 3
Comparative example 3 differs from example 1 in that the solvent in the A component of the waterborne two-component polyurethane topcoat in comparative example 3 is a single alcohol ester twelve (Texnol), the component content of the solvent being 4.5 parts; the other components and the addition amount of the water-based two-component polyurethane finish paint and the preparation method of the water-based two-component polyurethane finish paint are the same as those of the example 1.
Comparative example 4
Comparative example 4 differs from example 1 in that the solvent composition in the a component of the waterborne two-component polyurethane topcoat of comparative example 4 includes DPnB and Texnol, where: the mass ratio of DPnB to Texnol is 5: 4, the adding amount of the solvent composition is 4.5 parts; the other components and the addition amount of the water-based two-component polyurethane finish paint and the preparation method of the water-based two-component polyurethane finish paint are the same as those of the example 1.
Comparative example 5
Comparative example 5 differs from example 1 in that the solvent composition in the A component of the waterborne two-component polyurethane topcoat of comparative example 5 includes propylene glycol butyl ether (PnB) and Texnol. Wherein: the mass ratio of PnB to Texnol is 4: 7, the content of the solvent composition is 5.5 parts; the other components and the addition amount of the water-based two-component polyurethane finish paint and the preparation method of the water-based two-component polyurethane finish paint are the same as those of the example 1.
Comparative example 6
Comparative example 6 differs from example 1 in that the solvent composition in the a component of the waterborne two-component polyurethane topcoat of comparative example 6 includes Texnol and DPM, where: the mass ratio of PnB to Texnol is 7: 4. the content of the solvent composition is 5.5 parts; the other components and the addition amount of the water-based two-component polyurethane finish paint and the preparation method of the water-based two-component polyurethane finish paint are the same as those of the example 1.
Comparative example 7
Comparative example 7 differs from example 1 in that the solvent composition in the A component of the waterborne two-component polyurethane topcoat of comparative example 7 includes DAA and MMB, where: the mass ratio of DAA to MMB is 1: 1, adding 6 parts of solvent composition; the other components and the addition amount of the water-based two-component polyurethane finish paint and the preparation method of the water-based two-component polyurethane finish paint are the same as those of the example 1.
Comparative example 8
Comparative example 8 differs from example 1 in that the solvent composition in the A component of the waterborne two-component polyurethane topcoat of comparative example 8 includes DAA, propylene glycol, and Augeo SL 191, where: the mass ratio of DAA, propylene glycol and Augeo SL 191 was 4: 1: 1, adding 6 parts of solvent composition; the other components and the addition amount of the water-based two-component polyurethane finish paint and the preparation method of the water-based two-component polyurethane finish paint are the same as those of the example 1.
Comparative example 9
Comparative example 9 differs from example 1 in that the solvent composition in the A component of the waterborne two-component polyurethane topcoat of comparative example 9 includes MMB and propylene glycol, where: the mass ratio of MMB to propylene glycol is 4: 1.5: 1, the adding amount of the solvent composition is 5.5 parts; the other components and the addition amount of the water-based two-component polyurethane finish paint and the preparation method of the water-based two-component polyurethane finish paint are the same as those of the example 1.
Comparative example 10
Comparative example 10 differs from example 1 in that the solvent composition in the A component of the waterborne two-component polyurethane topcoat of comparative example 10 includes MMB, propylene glycol, and Augeo SL 191, where: the mass ratio of MMB, propylene glycol and Augeo SL 191 is 4: 1: 1, adding 6 parts of solvent composition; the other components and the addition amount of the water-based two-component polyurethane finish paint and the preparation method of the water-based two-component polyurethane finish paint are the same as those of the example 1.
Performance testing
The A component and the A component of the waterborne two-component polyurethane finish paint prepared in the examples 1-4 and the comparative examples 1-6 are mixed, sprayed on a polished and pretreated tinplate under different construction environments, observed for drying time, baked at 55 ℃ for 1 hour after being dried, cured to obtain a coating with a dry film of 30-50 mu m, cured at room temperature for 7 days, and subjected to performance test, and the test results are shown in the table 1.
Table 1: comparative tables of Properties of examples 1 to 4 and comparative examples 1 to 6
As can be seen from Table 1: the paint films of examples 1 to 4 were coated under both normal temperature and normal humidity environment and high temperature and high humidity environment, and all the properties were good. The paint films of comparative examples 1 to 6, which use other raw materials as solvents, were coated under normal temperature and normal humidity conditions, and the performances in all aspects were similar to those of examples 1 to 4, but when coated under high temperature and low humidity conditions, the performances in all aspects were reduced to some extent, and especially the gloss was significantly reduced. Meanwhile, in comparative examples 3 to 6, due to the presence of the solvent Texnol, although the gloss of the paint film was higher than that in comparative examples 1 to 2, the paint film hardness of the cured paint film was lower due to the residue of Texnol, and thus it was not suitable for industrial use.
The A component and the A component of the waterborne two-component polyurethane finish paint prepared in the example 1 and the comparative examples 7-10 are mixed, sprayed on a polished and pretreated tinplate under different construction environments, the drying time is observed, the mixture is baked for 1 hour at 55 ℃ after being dried, a coating with a dry film of 30-50 mu m is obtained after curing, the initial water resistance is tested after the coating is placed for 24 hours, and the performance is tested after the coating is cured for 7 days at room temperature, and the test results are shown in the table 2.
Table 2: comparative table of properties of example 1 and comparative examples 7 to 10
As can be seen from Table 2: examples 7 to 10 using only two or three solvents of DAA, MMB, propylene glycol and Augeo SL 191, which were applied in a normal temperature and normal humidity environment, had slightly inferior performance in all respects to that of example 1; however, when the paint is coated in a high-temperature and low-humidity environment, the performances of the paint film in terms of glossiness, fullness, initial water resistance and the like are far inferior to those of the paint film in example 1.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. 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. And obvious variations or modifications therefrom are intended to be within the scope of the invention.
Claims (10)
1. The solvent composition is characterized by comprising diacetone alcohol, 3-methoxy-3-methyl-1-butanol, propylene glycol and acetone glycerin, wherein the mass ratio of the diacetone alcohol to the 3-methoxy-3-methyl-1-butyl ester to the propylene glycol to the acetone glycerin is (1-3) to (0-1) to (1-2).
2. The water-based two-component polyurethane finish paint is characterized by comprising a component A and a component B; the A component comprises an aqueous hydroxy acrylic acid dispersion and the solvent composition of claim 1, and the B component is an aqueous curing agent.
3. The waterborne two-component polyurethane topcoat according to claim 2, wherein the aqueous hydroxyacrylic dispersion comprises a primary dispersion and a secondary dispersion; the hydroxyl content of the primary dispersion is 1.5-2.5 wt%, and the hydroxyl content of the secondary dispersion is 2.5-4 wt%; the mass ratio of the primary dispersion to the secondary dispersion is 1: (0.8-5).
4. The waterborne two-component polyurethane topcoat of claim 2, wherein the waterborne curing agent comprises a water-dispersible polyisocyanate and a cosolvent.
5. The waterborne two-component polyurethane topcoat of claim 4, wherein the water-dispersible polyisocyanate comprises a HDI-based water-dispersible polyisocyanate and an IPDI-based water-dispersible polyisocyanate; the mass ratio of the HDI-based water-dispersible polyisocyanate to the IPDI-based water-dispersible polyisocyanate is (2-5): 1.
6. the water-based two-component polyurethane finish paint according to claim 4, wherein the cosolvent is selected from any one or more of ethylene glycol diacetate, ethylene glycol methyl ether acetate, propylene glycol methyl ether acetate and mixed dibasic acid ester.
7. The waterborne two-component polyurethane topcoat of claim 2 or 4, wherein the a component further comprises at least one of a water-based adjuvant, a pigment, a filler, deionized water; preferably, the aqueous auxiliary agent comprises at least one of a wetting agent, a leveling agent, a thickening agent and an antifoaming agent.
8. The water-based two-component polyurethane topcoat according to claim 7, comprising in parts by weight:
a component A:
9. method for the preparation of a water-borne two-component polyurethane top-coat according to any one of claims 2 to 8, characterized in that it comprises the following steps:
grinding, dispersing and filtering the raw materials of the component A to obtain the component A;
dispersing and filtering the raw materials of the component B to obtain the component B.
10. Use of the water-borne two-component polyurethane topcoat as claimed in any of claims 2 to 8 in normal or extreme construction environments, characterized in that the normal construction environment is an ambient temperature of 10-30 ℃, a relative humidity of 35-85% RH; the extreme construction environment is that the environmental temperature is 30-42 ℃ and the relative temperature is less than 35% RH.
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| CN114196290A (en) * | 2021-12-29 | 2022-03-18 | 重庆南方漆业有限公司 | Industrial water-based paint coating and application method thereof |
| CN116135934A (en) * | 2021-11-16 | 2023-05-19 | 浩力森涂料（上海）有限公司 | Preparation method of highlight water-based polyurethane finish paint for special case |
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