CN109135543B - Preparation method of water-based paint capable of wetting and spraying - Google Patents
Preparation method of water-based paint capable of wetting and spraying Download PDFInfo
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- CN109135543B CN109135543B CN201811009027.1A CN201811009027A CN109135543B CN 109135543 B CN109135543 B CN 109135543B CN 201811009027 A CN201811009027 A CN 201811009027A CN 109135543 B CN109135543 B CN 109135543B
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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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- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/002—Priming paints
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- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
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- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
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Abstract
The invention discloses a preparation method of a wet-spraying water-based paint, belonging to the field of paint preparation. The invention comprises the preparation of a primer and a finish, wherein the primer is prepared according to the following method: A. preparing raw materials, adding part of the raw materials under stirring, and uniformly grinding until the fineness is less than 10 micrometers; B. adding the rest raw materials into the obtained mixture under the stirring condition, uniformly stirring, and filtering to obtain a primer; the finish paint is prepared by the following method: a. preparing raw materials, adding part of the raw materials under stirring, uniformly stirring and grinding until the fineness is less than 10 micrometers; b. and adding the rest raw materials into the obtained mixture under the stirring condition, uniformly stirring, and filtering to obtain the finish paint. The invention overcomes the defects that the water-based paint is difficult to wet spray and has lower production efficiency in the prior art, and can effectively realize a wet spraying process, thereby improving the production efficiency and reducing the production energy consumption.
Description
Technical Field
The invention relates to the technical field of paint preparation, in particular to a preparation method of a wet-spraying water-based paint.
Background
In industrial production, a plurality of products are required to be sprayed on the surface of the coating due to use requirements, the coating is an indispensable process requirement, the conventional solvent-based coating is common in the market at present, but along with the strict requirements of the current national environmental protection policy, the low-VOC low-energy-consumption water-based low-temperature coating product is produced at the same time, the conventional solvent-based coating is gradually replaced, the solvent-based coating is equivalent to the solvent-based coating in the aspects of common constructability, gloss leveling and the like, the solvent-based coating can easily realize wet spraying through process and formula design, the coating and baking process of two-coating and one-baking is realized, and the production energy consumption is greatly reduced. However, in the construction of water-based paint, two-coating one-baking is required, because the physical properties of water and organic solvent in various aspects such as evaporation heat, surface tension and the like are greatly different, the water-based paint product can be coated and baked only one time, the production efficiency is greatly influenced, and the energy consumption is high. Therefore, the development of a coating which is equivalent to a solvent-based coating and can easily realize a wet spraying process is important for improving the production efficiency, reducing the production energy consumption and improving the production benefits of enterprises.
Through retrieval, the technical research on the water-based paint has been published in patents, such as Chinese patent application No.: 2016108555962, filing date: in 2016, 9, 28 days, the invention and creation name is: the application discloses a two-component aqueous ecological paint and a preparation method thereof, and the formula comprises 50-80% of a film forming substance, 1-10% of an aqueous solvent, 5-15% of deionized water, 0.1-3% of a dispersing agent, 0.3-3% of a film forming additive, 0-20% of titanium dioxide, 0.1-1% of a wetting additive, 0.1-1% of a leveling additive, 0.1-1% of a defoaming additive, 0.1-3% of a shrinkage-proof additive, 0.1-5% of a thickening agent, 0.1-2% of a plant preservative, 0.1-10% of a fungus inhibitor, 0.1-10% of a wormwood extract, 0.1-10% of yeast, 0.1-10% of silver ions, 0.1-10% of calcium ions, 0.1-10% of titanium ions, 0-10% of a filler and 0-10% of a; the preparation method comprises the steps of uniformly stirring by a dispersion machine, adding the stirred raw materials into a grinding machine for grinding, filtering and packaging. The application is mainly applied to the decorative surface of a printed packaging product, is safe and anticorrosive, but is still difficult to ensure whether a wet spraying process can be realized.
Disclosure of Invention
1. Technical problem to be solved by the invention
The invention aims to overcome the defects that the water-based paint is difficult to wet spray and has low production efficiency in the prior art, and provides a preparation method of the water-based paint capable of wet spraying, which can effectively realize a wet spraying process, thereby improving the production efficiency, reducing the production energy consumption, being widely applied in the coating field, and particularly having good effects in the low-temperature coating field which relates to vehicle bodies and related requirements of two-layer coating and one-time baking.
2. Technical scheme
In order to achieve the purpose, the technical scheme provided by the invention is as follows:
the preparation method of the wet-spraying water-based paint comprises the preparation of a primer and a finish, wherein the primer is prepared according to the following method:
A. preparing raw materials, adding a water-based dispersing agent, a water-based defoaming agent, deionized water, an antiseptic bactericide, rutile titanium dioxide and hydrophilic fumed silica into the water-based hydroxy acrylic acid secondary dispersion under the stirring condition, and uniformly stirring and grinding the mixture until the fineness is less than 10 microns;
B. adding the obtained mixture into a water-based leveling agent, a water-based liquid rheological aid and propylene glycol diacetate under the stirring condition, uniformly stirring to obtain a raw paint, and filtering the raw paint by adopting a 150-mesh and 250-mesh filter screen to obtain a primer;
the finish paint is prepared by the following method:
a. preparing raw materials, adding a water-based dispersing agent, a water-based defoaming agent, deionized water, an antiseptic bactericide, an organic pigment and hydrophilic fumed silica into the water-based hydroxyl acrylic acid secondary dispersion under the stirring condition, and uniformly stirring and grinding the mixture until the fineness is less than 10 microns;
b. and adding the water-based leveling agent, the water-based liquid rheological additive and propylene glycol diacetate into the obtained mixture under the stirring condition, uniformly stirring to obtain the original paint, and filtering the original paint by adopting a 150-mesh and 250-mesh filter screen to obtain the finish paint.
Further, in the step A, the aqueous hydroxy acrylic acid secondary dispersion is stirred under the condition of 300-; in the step B, the mixture is stirred and other raw materials are added under the conditions of 300-700 r/min.
Further, in the step a, the aqueous hydroxy acrylic acid secondary dispersion is stirred under the condition of 300-700 r/min and other raw materials are added, after the addition is finished, the mixture is stirred for 10-15min under the condition of 700-1200 r/min and then is ground; in the step b, the mixture is stirred at the conditions of 300-700 r/min and other raw materials are added.
Further, the addition part by weight of the hydrophilic fumed silica in the primer is more than the addition part by weight of the hydrophilic fumed silica in the topcoat.
Furthermore, the ratio of the adding weight portion of the hydrophilic fumed silica in the finishing coat to the adding weight portion of the hydrophilic fumed silica in the primer is 1 to (1.2-5).
Furthermore, the ratio of the adding weight portion of the hydrophilic fumed silica in the finishing coat to the adding weight portion of the hydrophilic fumed silica in the primer is 1 to (2-2.5).
Furthermore, the adding weight part of the water-based leveling agent in the primer is less than that of the water-based leveling agent in the finish paint, and the ratio of the adding weight part of the water-based leveling agent in the finish paint to the adding weight part of the water-based leveling agent in the primer is (1.5-3) to 1.
Further, the primer comprises the following raw materials in parts by weight:
furthermore, the finish paint comprises the following raw materials in parts by weight:
further, the deionized water has a conductivity in the range of 0.1 to 20 us/cm.
3. Advantageous effects
Compared with the prior art, the technical scheme provided by the invention has the following remarkable effects:
(1) according to the preparation method of the wettable spray-wet water-based coating, the hydrophilic fumed silica is added into the primer and the finish paint, the adding weight of the hydrophilic fumed silica in the primer is more than that of the hydrophilic fumed silica in the finish paint, the requirements of no sagging and good leveling property in normal vertical face construction of the primer are met, the requirement for high appearance effect of the finish paint is met, a necessary guarantee is provided for a wet spray-wet construction process, the primer does not need to be dried or pre-baked when the coating is used, a paint film coating system can be formed by one-time baking after the two coatings are sprayed, the production efficiency is improved, the production energy consumption is reduced, and the application in wet spray-wet construction is very convenient.
(2) According to the preparation method of the wet-spraying water-based paint, the produced primer and the finish paint are used in a matched manner, each coating is not required to be baked and cured, the production efficiency is improved, the production cost is reduced, meanwhile, the whole exposure of a wet film of the coating to a production environment for a long time can be reduced, and the surface cleanliness of a dry film is improved.
(3) According to the preparation method of the wet-spraying water-based paint, the water-based defoaming agent meets the requirements of inhibiting and eliminating bubble microbubbles in the color paste grinding and construction processes, and a small amount of propylene glycol diacetate is introduced to further reduce the foamability of a paint film, further improve the surface effect of the paint film and improve the workability.
(4) According to the preparation method of the wet-spraying water-based paint, the addition of the pH value regulator and the anticorrosive bactericide is beneficial to ensuring the storage stability of the paint product, so that the raw materials are mutually matched to obtain the primer and the finish paint with excellent comprehensive performance, and the good appearance effect of the product is ensured.
(5) According to the preparation method of the wettable spraying water-based paint, the primer provides an excellent effect of starting and stopping on the surface of the base material, the outstanding adhesive force and covering power of the primer provide a good foundation for improving the flatness of the base material and providing high surface appearance quality of a composite coating, and the coating effect of the primer and the finish after double coating and single baking is that the finish is uniformly covered, no primer is exposed, no shrinkage cavity is formed, and the quality is obviously improved.
Drawings
FIG. 1 is a schematic flow diagram of a method of preparing a primer according to the present invention;
FIG. 2 is a schematic flow diagram of a method of preparing a topcoat of the present invention;
FIG. 3 is a schematic flow chart of the method of using the coating of the present invention.
Detailed Description
For a further understanding of the invention, reference should be made to the following detailed description taken in conjunction with the accompanying drawings.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The present invention will be further described with reference to the following examples.
Example 1
As shown in fig. 1 to 3, the preparation method of a wet-spraying water-based paint of this example includes the preparation of a primer and a top coat, wherein the primer is prepared according to the following method:
A. preparing raw materials, adding a water-based dispersing agent, a water-based defoaming agent, deionized water, an antiseptic bactericide, rutile titanium dioxide and hydrophilic fumed silica into the water-based hydroxy acrylic acid secondary dispersion under the stirring condition, and uniformly stirring and grinding the mixture until the fineness is less than 10 microns;
B. adding the obtained mixture into a water-based leveling agent, a water-based liquid rheological aid and propylene glycol diacetate under the stirring condition, uniformly stirring to obtain a raw paint, and filtering the raw paint by adopting a 150-mesh and 250-mesh filter screen to obtain a primer;
the finish paint is prepared by the following method:
a. preparing raw materials, adding a water-based dispersing agent, a water-based defoaming agent, deionized water, an antiseptic bactericide, an organic pigment and hydrophilic fumed silica into the water-based hydroxyl acrylic acid secondary dispersion under the stirring condition, and uniformly stirring and grinding the mixture until the fineness is less than 10 microns;
b. and adding the water-based leveling agent, the water-based liquid rheological additive and propylene glycol diacetate into the obtained mixture under the stirring condition, uniformly stirring to obtain the original paint, and filtering the original paint by adopting a 150-mesh and 250-mesh filter screen to obtain the finish paint.
Specifically, the primer in this embodiment includes the following raw materials in parts by weight:
the preparation method of the primer in the embodiment specifically comprises the following steps:
A. preparing raw materials according to the formula amount, stirring the aqueous hydroxy acrylic acid secondary dispersion under the condition of 300 revolutions per minute, adding 0.2-0.4 part by weight of pH value regulator (the addition amount is determined according to the pH value of the selected aqueous hydroxy acrylic acid secondary dispersion), aqueous dispersant, aqueous defoaming agent, deionized water, antiseptic bactericide, rutile type titanium dioxide and hydrophilic fumed silica under the stirring condition, stirring the mixture for 10 minutes under the condition of 700 revolutions per minute after the addition is finished, and grinding the mixture until the fineness is less than 10 micrometers;
B. and D, stirring the mixture obtained in the step A at 300 revolutions per minute, adding the aqueous flatting agent, the aqueous liquid rheological aid and the propylene glycol diacetate according to the formula amount under the stirring condition, uniformly stirring to obtain the raw paint, and filtering the raw paint by using a 200-mesh filter screen to obtain the primer.
Specifically, in the preparation of the primer in this embodiment, half of the aqueous hydroxy acrylic acid secondary dispersion, the aqueous dispersant, and the aqueous defoamer may be uniformly dispersed into deionized water under stirring to form a first mixture; then adding the antiseptic bactericide, rutile titanium dioxide and hydrophilic fumed silica into the first mixture, uniformly mixing to form a second mixture, and dispersing and grinding the second mixture until the fineness is less than 10 micrometers; and then adding the rest half of the aqueous hydroxy acrylic acid secondary dispersion, the pH value regulator, the aqueous leveling agent, the aqueous liquid rheological aid and the propylene glycol diacetate into a second mixed species under the condition of low-speed dispersion, uniformly stirring at a medium speed to obtain the raw paint, and then filtering to obtain the primer.
The waterborne defoamer in the base paint formula in the embodiment consists of a winning paint additive TEGOFoamex830 and a Surfynol MD-20 (original air chemical industry, now the winning paint additive), wherein the TEGOFoamex830 is used for grinding the early-stage color paste, and the Surfynol MD-20 is used for adding in the later-stage finished paint formula; the hydrophilic fumed silica is N20ST fumed silica from wacke chemical (Chinese) limited company (WACKER), and the aqueous liquid rheological additive is prepared from BYK-420 and BYK-425 from BYK company; the antiseptic bactericide is a KATHON LXE high-performance antiseptic bactericide provided by Dow chemical (DOW) company.
The finish paint in the embodiment specifically comprises the following raw materials in parts by weight:
the finish paint in the embodiment is prepared by the following method:
step a, preparing raw materials according to the formula amount, stirring the aqueous hydroxyl acrylic acid secondary dispersion under the condition of 300 revolutions per minute, adding 0.2-0.4 part by weight of pH value regulator (the addition amount is determined according to the pH value of the selected aqueous hydroxyl acrylic acid secondary dispersion), aqueous dispersant, aqueous defoaming agent, deionized water, antiseptic bactericide, organic pigment and hydrophilic fumed silica under the stirring condition, stirring the mixture for 10 minutes under the condition of 700 revolutions per minute after the addition is finished, and grinding the mixture until the fineness is less than 10 micrometers after the uniform stirring;
b. and adding the water-based leveling agent, the water-based liquid rheological aid and propylene glycol diacetate into the obtained mixture under the stirring condition of 300 r/min, uniformly stirring to obtain the raw paint, and filtering the raw paint by using a 200-mesh filter screen to obtain the finish paint.
In the embodiment, the conductivity of deionized water used for the primer and the finish paint is 0.1uS/cm, and the lower conductivity is adopted, so that the performance of the water-based paint is more stable, and the storage stability period is relatively prolonged.
In this embodiment, a white primer and a red finish are specifically used in combination, a red organic pigment may be selected as a raw material of the finish, other raw materials used in the finish are substantially the same as those used in the primer, the addition weight part of hydrophilic fumed silica in the finish is less than that of hydrophilic fumed silica in the primer, the addition weight part of the aqueous leveling agent in the primer is less than that of the aqueous leveling agent in the finish, specifically, in this embodiment, the ratio of the addition weight part of the aqueous leveling agent in the primer to that of the aqueous leveling agent in the primer is 2: 1, and the ratio of the addition weight part of hydrophilic fumed silica in the finish to that of the hydrophilic fumed silica in the primer is 1: 2.
When the primer is prepared in the embodiment, the hydrophilic fumed silica, the aqueous liquid rheological additive and the appropriate aqueous leveling agent are adopted to be matched, so that the requirements of no sagging and good leveling property of normal vertical face construction of the primer are met, and meanwhile, a necessary guarantee is provided for a wet spraying construction process; specifically, the hydrophilic fumed silica in this embodiment can provide a rheology control capability in a liquid system due to its surface chemistry and chain structure, and at the same time, has a rheology control capability of preventing the occurrence of "photo frame" and "thick edge" phenomena, and can limit the microscopic movement of the internal components of the coating during the curing and drying reaction of the wet coating, and improve the "holding power" of the coating, thereby achieving the effect of being beneficial to preventing the paint film from being "bitten" by the finish when wet-sprayed; the proper water-based leveling agent can provide lower surface tension of a wet paint film surface layer, makes up possible tiny flaws possibly existing in the holding force function of hydrophilic fumed silica in the curing process of a wet film coating, and further ensures the performance of a paint film wet spraying process; the aqueous liquid rheological additive is beneficial to ensuring good stability of the coating in the storage process, avoiding obvious phenomena of water diversion and pigment and filler precipitation and improving the sagging resistance of the coating in the vertical spraying process; the aqueous defoaming agent provides requirements for inhibiting and eliminating bubble microbubbles in the color paste grinding and construction processes, and a small amount of propylene glycol diacetate is introduced to further reduce the foamability of a paint film, further improve the surface effect of the paint film and improve the workability; the addition of the pH value regulator and the anticorrosive bactericide is beneficial to ensuring the storage stability of the paint product, so that the raw materials are mutually matched to obtain the primer with excellent comprehensive performance. In the same way, in the preparation process of the finish paint, the hydrophilic fumed silica and the aqueous liquid rheological additive are matched with a proper aqueous leveling agent, and the adding weight of the hydrophilic fumed silica is lower than that of the primer, so that the requirement of the finish paint on high appearance effect is met, and necessary guarantee is provided for a wet spraying construction process; the aqueous defoaming agent provides requirements for inhibiting and eliminating bubble microbubbles in the color paste grinding and construction processes, and a small amount of propylene glycol diacetate is introduced to further reduce the foamability of a paint film, further improve the surface effect of the paint film and improve the workability; the addition of the pH value regulator and the anticorrosive bactericide is beneficial to ensuring the storage stability of the paint product, so that the raw materials are mutually matched to obtain finish paint with excellent comprehensive performance, and the good appearance effect of the product is ensured. The primer of the embodiment is matched with the water-based hydroxy acrylic acid secondary dispersion and the rutile type titanium dioxide, has high adhesion and high covering power matched with corresponding substrates, provides adhesion, high covering power and ground color required by a wet spraying process, provides the required color and corresponding physical indexes for the finish paint, is matched with the primer for use, has good water resistance, and has high matching with the substrates and the finish paint.
In the embodiment, the primer provides an excellent effect of starting and stopping between the base material and the finish, the outstanding adhesive force and covering power of the primer provide a good foundation for improving the flatness of the base material and providing high surface appearance quality of the composite coating, and the finish paint layer realizes rich color decoration and meets the requirements of bright colors of the paint. The coating effect of the primer and the finish prepared by the formula of the embodiment after the primary coating and baking is uniform in finish covering, free of primer exposure and shrinkage cavity, and the quality is obviously improved. In addition, when the primer and the finish paint are used in a matched manner, each coating does not need to be baked and cured, the production efficiency is improved, the production cost is reduced, meanwhile, the whole exposure of a wet film of the coating in a production environment for a long time can be reduced, and the surface cleanliness of a dry film is improved.
Example 2
The preparation method of the wet-spraying water-based paint comprises a primer and a finish, which is basically the same as that in example 1, except that the primer comprises the following raw materials in parts by weight:
the preparation method of the primer in the embodiment is as follows:
A. preparing raw materials according to the formula amount, stirring the aqueous hydroxy acrylic acid secondary dispersion under the condition of 500 revolutions per minute, adding 0.2-0.4 part by weight of pH value regulator (the addition amount is determined according to the pH value of the selected aqueous hydroxy acrylic acid secondary dispersion), aqueous dispersant, aqueous defoaming agent, deionized water, antiseptic bactericide, rutile type titanium dioxide and hydrophilic fumed silica under the stirring condition, stirring the mixture for 12min under the condition of 1000 revolutions per minute after the addition is finished, and grinding the mixture until the fineness is less than 10 micrometers;
B. and B, stirring the mixture obtained in the step A at 500 revolutions per minute, adding the aqueous flatting agent, the aqueous liquid rheological aid and the propylene glycol diacetate according to the formula amount under the stirring condition, uniformly stirring to obtain the raw paint, and filtering the raw paint by using a 150-mesh filter screen to obtain the primer.
The finish paint in the embodiment comprises the following raw materials in parts by weight:
in the embodiment, the ratio of the adding parts by weight of the hydrophilic fumed silica in the top coat to the adding parts by weight of the hydrophilic fumed silica in the primer is 1: 2.1, the ratio of the adding parts by weight of the water-based leveling agent in the top coat to the adding parts by weight of the water-based leveling agent in the primer is 3: 1, and the electric conductivity of deionized water used for the primer and the top coat is 20 us/cm.
The finish paint in the embodiment is prepared by the following method:
step a, preparing raw materials according to the formula amount, stirring the aqueous hydroxyl acrylic acid secondary dispersion under the condition of 500 revolutions per minute, adding 0.2-0.4 part by weight of pH value regulator (the addition amount is determined according to the pH value of the selected aqueous hydroxyl acrylic acid secondary dispersion), aqueous dispersant, aqueous defoaming agent, deionized water, antiseptic bactericide, organic pigment and hydrophilic fumed silica under the stirring condition, stirring the mixture for 12 minutes under the condition of 1000 revolutions per minute after the addition is finished, and grinding the mixture until the fineness is less than 10 micrometers after the uniform stirring;
b. and adding the water-based leveling agent, the water-based liquid rheological aid and propylene glycol diacetate into the obtained mixture under the stirring condition of 500 revolutions per minute, uniformly stirring to obtain the raw paint, and filtering the raw paint by adopting a 150-mesh filter screen to obtain the finish paint.
Example 3
The preparation method of the wet-spraying water-based paint comprises a primer and a finish, which is basically the same as that in example 1, except that the primer comprises the following raw materials in parts by weight:
the preparation method of the primer in the embodiment is as follows:
A. preparing raw materials according to the formula amount, stirring the aqueous hydroxy acrylic acid secondary dispersion under the condition of 700 revolutions per minute, adding 0.2-0.4 part by weight of pH value regulator (the addition amount is determined according to the pH value of the selected aqueous hydroxy acrylic acid secondary dispersion), aqueous dispersant, aqueous defoaming agent, deionized water, antiseptic bactericide, rutile type titanium dioxide and hydrophilic fumed silica under the stirring condition, stirring the mixture for 15min under the condition of 1200 revolutions per minute after the addition is finished, and grinding the mixture until the fineness is less than 10 microns;
B. and B, stirring the mixture obtained in the step A at 700 revolutions per minute, adding the aqueous flatting agent, the aqueous liquid rheological aid and the propylene glycol diacetate according to the formula amount under the stirring condition, uniformly stirring to obtain the raw paint, and filtering the raw paint by using a 250-mesh filter screen to obtain the primer.
The finish paint in the embodiment comprises the following raw materials in parts by weight:
in this example, the ratio of the added weight parts of the hydrophilic fumed silica in the top coat to the added weight parts of the hydrophilic fumed silica in the primer is 1: 2, the ratio of the added weight parts of the water-based leveling agent in the top coat to the added weight parts of the water-based leveling agent in the primer is 2: 1, and the conductivity of the deionized water used in the primer and the top coat is 10 us/cm.
The finish paint in the embodiment is prepared by the following method:
step a, preparing raw materials according to the formula amount, stirring the aqueous hydroxyl acrylic acid secondary dispersion under the condition of 700 revolutions per minute, adding 0.2-0.4 part by weight of pH value regulator (the addition amount is determined according to the pH value of the selected aqueous hydroxyl acrylic acid secondary dispersion), aqueous dispersant, aqueous defoaming agent, deionized water, antiseptic bactericide, organic pigment and hydrophilic fumed silica under the stirring condition, stirring the mixture for 15min under the condition of 1200 revolutions per minute after the addition is finished, and grinding the mixture until the fineness is less than 10 microns after uniform stirring;
b. and adding the water-based leveling agent, the water-based liquid rheological aid and propylene glycol diacetate into the obtained mixture under the stirring condition of 700 revolutions per minute, uniformly stirring to obtain the raw paint, and filtering the raw paint by using a 250-mesh filter screen to obtain the finish paint.
The following table 1 shows the raw material composition of the primer in the above three examples:
TABLE 1 primer raw Material composition
The following table 2 shows the raw material composition of the top-coat in the above three examples:
TABLE 2 Top-coat raw Material composition
When the paint prepared by the embodiment is used, the primer and the finish paint are used in a matching way, and the specific method comprises the following steps:
step one, uniformly blending the primer, a general waterborne curing agent and deionized water according to the ratio of (3-5) to (1-2) to 1;
step two, uniformly blending the finish paint, a general waterborne curing agent and deionized water according to the ratio of (2-4) to (1-2) to 1;
thirdly, spraying the prepared primer on the surface of the workpiece, and leveling for 1-3min at normal temperature;
spraying the prepared finish paint on the primer layer, and leveling and drying the two coatings at normal temperature for 20-30 min; then curing and baking for 25-35min at the temperature of 80 +/-5 ℃ to form a paint film coating system.
The first step and the second step are not required in sequence, and the universal water-based curing agent is a water-based isocyanate curing agent and specifically comprises the following raw materials in parts by weight: 40-50 parts of IPDI (isophorone diisocyanate) -based hydrophilic modified aliphatic polyisocyanate; 40-50 parts of HDI-based hydrophilic modified aliphatic polyisocyanate; 5-15 parts of propylene glycol diacetate; the preparation method of the general waterborne curing agent comprises the following steps: the raw materials in the formula ratio are uniformly mixed and stirred for at least 10min to prepare the universal water-based curing agent. The conductivity of the deionized water used is likewise from 0.1 to 20 us/cm.
Specifically, the universal aqueous curing agent in this embodiment comprises the following raw materials in parts by weight: based on IPDI (isophorone diisocyanate) hydrophilic modified aliphatic polyisocyanate 45 parts; 45 parts of HDI-based hydrophilic modified aliphatic polyisocyanate; 10 parts of propylene glycol diacetate. When the paint is used, uniformly blending the primer, the universal water-based curing agent and deionized water according to a ratio of 4: 1, uniformly blending the finish paint, the universal water-based curing agent and the deionized water according to a ratio of 3: 1, spraying the blended primer on the surface of a workpiece, and leveling for 1min at normal temperature; spraying the prepared finish paint on the primer layer, and leveling and drying the two coatings for 20min at normal temperature; and then curing and baking for 25min at the temperature of 75 ℃ to form a paint film coating system. When the paint is used, the primer and the finish paint are sequentially sprayed on the surface of a workpiece, the primer is not required to be dried or prebaked, a paint film coating system can be formed by once baking after the two coatings are sprayed, and the paint is very convenient to apply in wet spraying construction.
Comparative example 1
The coating of the comparative example comprises a primer and a finish, wherein the primer comprises the following raw materials in parts by weight:
the preparation method of the primer in the comparative example is basically the same as the above example, the pH value regulator, the aqueous dispersant, the aqueous defoamer a, the deionized water, the antiseptic bactericide and the rutile titanium dioxide are added into the aqueous hydroxyacrylic acid secondary dispersion according to the formula amount under the stirring condition of 300-700 r/min, after the addition is finished, the mixture is stirred for 10-15min under the stirring condition of 700-1200 r/min, and then the mixture is ground until the fineness is less than 10 microns; and then adding the water-based antifoaming agent b, the water-based leveling agent, the water-based liquid rheological aid a, the water-based liquid rheological aid b and the propylene glycol diacetate into the obtained mixture under the stirring condition of 300-700 r/min, uniformly stirring, and filtering by adopting a 150-filter 250-mesh filter screen to prepare the primer.
The finish paint in the comparative example comprises the following raw materials in parts by weight:
the preparation method of the finish paint in the comparative example is basically the same as that in the above example, the pH value regulator, the aqueous dispersant, the aqueous defoamer a, the deionized water, the antiseptic bactericide and the red organic pigment are added into the aqueous hydroxyl acrylic acid dispersoid under the stirring condition of 300-700 r/min, after the addition is finished, the mixture is stirred for 10-15min under the stirring condition of 700-1200 r/min, and then the mixture is ground until the fineness is less than 10 microns; and then adding the water-based antifoaming agent b, the water-based leveling agent, the water-based liquid rheological aid a, the water-based liquid rheological aid b and the propylene glycol diacetate into the obtained mixture under the stirring condition of 300-700 r/min, uniformly stirring, and filtering by using a 150-filter 250-mesh filter screen to obtain the finish paint.
Comparative example 2
The coating of the comparative example comprises a primer and a finish, and is basically the same as the comparative example 1, except that the primer comprises the following raw materials in parts by weight:
the finish paint in the comparative example comprises the following raw materials in parts by weight:
the following table 3 shows the raw material composition of the primer in the above two pairs of proportions:
TABLE 3 raw material composition of primer
The following table 4 shows the raw material composition of the two pairs of intermediate coats:
TABLE 4 raw Material composition of topcoat
The primer and the finish prepared in the above examples 1 to 3 and comparative examples 1 and 2 are respectively blended with a matched universal water-based curing agent and deionized water, and then sprayed on a related substrate, the specific method refers to the method for using the primer and the finish in example 3, and the performance of the paint film is detected after the paint film coating is formed, and the detection results are shown in the following table 5.
TABLE 5 paint film Performance test results
The detection standards of the above properties are as follows:
the performance suitable for spraying: the primer and the finish paint have good dispersibility, moderate leveling property, good thixotropy, uniform coating, no obvious orange peel, no pinhole bubbles and no impurities when being sprayed; no appearance defects such as sagging, bottom exposure, light loss and the like;
the hardness of a paint film is more than or equal to HB mitsubishi pencil;
and (3) testing the adhesive force: the hundred-grid test method has no broken edge falling off, no falling off in the coating grid, and no paint spot on the 3M adhesive tape;
gloss: the gloss test value is more than or equal to 85(60 degrees);
water-soaking resistance: the periphery of the sample plate is sealed, the sample plate is placed in a neutral water tank at 23 +/-2 ℃, the sample plate is taken out after being soaked in water for 7 days, and the sample plate is tested after being recovered for 2 hours, wherein the paint coating surface is free from expansion, water bubbles, falling off and light loss, and the adhesion force test is less than or equal to 0 grade;
the paint film has acid resistance (25 ℃ multiplied by 24H), does not bubble, fall off and has no obvious light loss and color change under the condition of 0.1NH2SO 4;
alkali resistance (25 ℃ multiplied by 7d), 0.1NNaoH and 23 +/-2 ℃ multiplied by 7d, and a paint film has no obvious light loss, color change, foaming, expansion and falling off;
artificial accelerated aging resistance: ultraviolet light aging is carried out for 500 hours, the pulverization of a paint film is less than or equal to level 1, the delustering of the paint film is less than or equal to level 1, the color change of the paint film is less than or equal to level 2, and the cracking of the paint film is less than or equal to level 1.
The primer and the finish of the coating prepared by the processing of the embodiment meet the following requirements: the primer and the finish paint are water-based environment-friendly two-component polyurethane low-temperature curing coating, so that the environment is protected, the restriction instruction of harmful substances of European Union ROHS is met, and the system and environment protection requirements are met; the coating has no dust, particles and impurities in appearance, has good fluidity and does not form a stretched skin shape or solidified glue joint; the shelf life of the paint is not less than 12 months under normal temperature and not less than 6 months after the paint is opened.
Example 4
The preparation method of the wet-spraying water-based paint comprises a primer and a finish, which is basically the same as that in example 1, except that the primer comprises the following raw materials in parts by weight:
the finish paint in the embodiment comprises the following raw materials in parts by weight:
in the embodiment, the ratio of the adding weight parts of the hydrophilic fumed silica in the top coat to the adding weight parts of the hydrophilic fumed silica in the primer is 1: 2; the ratio of the added weight parts of the water-based leveling agent in the finish paint to the added weight parts of the water-based leveling agent in the primer paint is 1.5: 1.
When the coating prepared by the embodiment is used, the primer is matched with the finish, and specifically, the primer, the general waterborne curing agent and the deionized water are uniformly mixed according to the ratio of 3: 2: 1; uniformly blending finish paint, a universal water-based curing agent and deionized water according to the ratio of 2: 1, spraying the blended primer paint on the surface of a workpiece, leveling at normal temperature for 3min, spraying the blended finish paint on the primer paint, and leveling and drying at normal temperature for 30min for two coatings; then curing and baking for 35min at the temperature of 85 ℃ to form a paint film coating system.
The universal water-based curing agent is a water-based isocyanate curing agent and specifically comprises the following raw materials in parts by weight: 40 parts of IPDI (isophorone diisocyanate) -based hydrophilic modified aliphatic polyisocyanate; 40 parts of HDI-based hydrophilic modified aliphatic polyisocyanate; 5 parts of propylene glycol diacetate.
Example 5
The preparation method of the wet-spraying water-based paint comprises a primer and a finish, which is basically the same as that in example 1, except that the primer comprises the following raw materials in parts by weight:
the finish paint in the embodiment comprises the following raw materials in parts by weight:
in the embodiment, the ratio of the adding parts by weight of the hydrophilic fumed silica in the top coat to the adding parts by weight of the hydrophilic fumed silica in the primer is 1: 2.5, and the ratio of the adding parts by weight of the water-based leveling agent in the top coat to the adding parts by weight of the water-based leveling agent in the primer is 3: 1.
When the coating prepared by the embodiment is used, the primer is matched with the finish, and specifically, the primer, the general waterborne curing agent and the deionized water are uniformly mixed according to the ratio of 5: 2: 1; uniformly blending finish paint, a universal water-based curing agent and deionized water according to the ratio of 4: 2: 1, spraying the blended primer paint on the surface of a workpiece, leveling at normal temperature for 2min, spraying the blended finish paint on the primer paint, and leveling and drying at normal temperature for 25 min; then curing and baking for 30min at the temperature of 80 ℃ to form a paint film coating system.
The universal water-based curing agent is a water-based isocyanate curing agent and specifically comprises the following raw materials in parts by weight: 50 parts of IPDI (isophorone diisocyanate) -based hydrophilic modified aliphatic polyisocyanate; 50 parts of HDI-based hydrophilic modified aliphatic polyisocyanate; 15 parts of propylene glycol diacetate.
Example 6
The preparation method of the wet-spraying water-based paint comprises a primer and a finish, which is basically the same as that in example 1, except that the primer comprises the following raw materials in parts by weight:
the finish paint in the embodiment comprises the following raw materials in parts by weight:
in the embodiment, the ratio of the adding parts by weight of the hydrophilic fumed silica in the top coat to the adding parts by weight of the hydrophilic fumed silica in the primer is 1: 5, and the ratio of the adding parts by weight of the water-based leveling agent in the top coat to the adding parts by weight of the water-based leveling agent in the primer is 1.5: 1.
When the coating prepared by the embodiment is used, the primer and the finish are matched for use, which is basically the same as the embodiment, except that the primer, the general waterborne curing agent and the deionized water are uniformly mixed according to the ratio of 5: 1; the finish paint, the general waterborne curing agent and the deionized water are uniformly mixed according to the ratio of 4: 1.
Example 7
The preparation method of the wet-spraying water-based paint comprises a primer and a finish, which is basically the same as that in example 1, except that the primer comprises the following raw materials in parts by weight:
the finish paint in the embodiment comprises the following raw materials in parts by weight:
in the embodiment, the ratio of the adding parts by weight of the hydrophilic fumed silica in the top coat to the adding parts by weight of the hydrophilic fumed silica in the primer is 1: 1.2, and the ratio of the adding parts by weight of the water-based leveling agent in the top coat to the adding parts by weight of the water-based leveling agent in the primer is 2.5: 1.
When the coating prepared by the embodiment is used, the primer and the finish are matched for use, which is basically the same as the embodiment, except that the primer, the general waterborne curing agent and the deionized water are uniformly mixed according to the ratio of 5: 1.5: 1; the finish paint, the general waterborne curing agent and the deionized water are uniformly mixed according to the ratio of 4: 1.5: 1.
The present invention and its embodiments have been described above schematically, without limitation, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching, without departing from the spirit of the invention, the person skilled in the art shall not inventively design the similar structural modes and embodiments to the technical solution, but shall fall within the scope of the invention.
Claims (5)
1. A preparation method of a wet-spraying water-based paint is characterized by comprising the following steps: the method comprises the preparation of a primer and a finish, wherein the primer comprises the following raw materials in parts by weight:
55-60 parts of aqueous hydroxy acrylic acid secondary dispersion;
0.8-1.5 parts of aqueous dispersant;
0.4-0.8 of water-based defoaming agent;
8-15 parts of deionized water;
0.0-0.3 of antiseptic bactericide;
20-25 parts of rutile type titanium dioxide;
hydrophilic fumed silica 0.1-0.5;
0.2-0.4 parts of water-based leveling agent;
0.8-1.6 parts of aqueous liquid rheological additive;
3-5 parts of propylene glycol diacetate;
the finish paint comprises the following raw materials in parts by weight:
77-83 parts of aqueous hydroxy acrylic acid secondary dispersion;
0.7-1.5 parts of aqueous dispersant;
0.4-0.8 of water-based defoaming agent;
6-10 parts of deionized water;
0.0-0.3 of antiseptic bactericide;
3-5 parts of organic pigment;
hydrophilic fumed silica 0.05-0.25;
0.4-0.8 parts of water-based leveling agent;
0.8-1.6 parts of aqueous liquid rheological additive;
3-5 parts of propylene glycol diacetate;
the primer is prepared by the following method:
A. preparing raw materials, adding a water-based dispersing agent, a water-based defoaming agent, deionized water, an antiseptic bactericide, rutile titanium dioxide and hydrophilic fumed silica into the water-based hydroxy acrylic acid secondary dispersion under the stirring condition, and uniformly stirring and grinding the mixture until the fineness is less than 10 microns;
B. adding the obtained mixture into a water-based leveling agent, a water-based liquid rheological aid and propylene glycol diacetate under the stirring condition, uniformly stirring to obtain a raw paint, and filtering the raw paint by adopting a 150-mesh and 250-mesh filter screen to obtain a primer;
the finish paint is prepared by the following method:
a. preparing raw materials, adding a water-based dispersing agent, a water-based defoaming agent, deionized water, an antiseptic bactericide, an organic pigment and hydrophilic fumed silica into the water-based hydroxyl acrylic acid secondary dispersion under the stirring condition, and uniformly stirring and grinding the mixture until the fineness is less than 10 microns;
b. adding the obtained mixture into a water-based leveling agent, a water-based liquid rheological aid and propylene glycol diacetate under the stirring condition, uniformly stirring to obtain a raw paint, and filtering the raw paint by adopting a 150-mesh and 250-mesh filter screen to obtain finish paint;
the ratio of the adding weight parts of the hydrophilic fumed silica in the finishing coat to the adding weight parts of the hydrophilic fumed silica in the primer is 1: (1.2-5); the adding weight part of the water-based leveling agent in the primer is less than that of the water-based leveling agent in the finish paint, and the ratio of the adding weight part of the water-based leveling agent in the finish paint to the adding weight part of the water-based leveling agent in the primer is (1.5-3): 1.
2. a method of making a wet-sprayable aqueous coating of claim 1, comprising: in the step A, stirring the aqueous hydroxy acrylic acid secondary dispersion under the condition of 300-700 r/min, adding other raw materials, stirring the mixture for 10-15min under the condition of 700-1200 r/min, and then grinding; in the step B, the mixture is stirred and other raw materials are added under the conditions of 300-700 r/min.
3. A method of making a wet-sprayable aqueous coating of claim 1, comprising: step a, stirring the aqueous hydroxy acrylic acid secondary dispersion under the condition of 300-700 r/min, adding other raw materials, stirring the mixture for 10-15min under the condition of 700-1200 r/min, and then grinding; in the step b, the mixture is stirred at the conditions of 300-700 r/min and other raw materials are added.
4. A method of making a wet-sprayable aqueous coating of claim 1, comprising: the ratio of the adding weight parts of the hydrophilic fumed silica in the finishing coat to the adding weight parts of the hydrophilic fumed silica in the primer is 1: (2-2.5).
5. A method of making a wet-sprayable aqueous coating of claim 1, comprising: the conductivity of the deionized water is in the range of 0.1-20 us/cm.
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| CN1550265A (en) * | 2003-05-13 | 2004-12-01 | �ձ�������ʽ���� | Method for forming plural-layered coated film |
| CN105419603A (en) * | 2015-12-17 | 2016-03-23 | 三棵树涂料股份有限公司 | Easy-to-polish water-based woodware double-component white primer and preparation method thereof |
| CN107177257A (en) * | 2017-06-30 | 2017-09-19 | 苏州日新水性涂料有限公司 | A kind of silver-colored sealing wax of wet on wet sudden strain of a muscle |
| CN108192481A (en) * | 2017-12-26 | 2018-06-22 | 株洲市九华新材料涂装实业有限公司 | A kind of locomotive internal and external ornament aqueous polyurethane dull finishing coat and preparation method |
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|---|---|---|---|---|
| CN1550265A (en) * | 2003-05-13 | 2004-12-01 | �ձ�������ʽ���� | Method for forming plural-layered coated film |
| CN105419603A (en) * | 2015-12-17 | 2016-03-23 | 三棵树涂料股份有限公司 | Easy-to-polish water-based woodware double-component white primer and preparation method thereof |
| CN107177257A (en) * | 2017-06-30 | 2017-09-19 | 苏州日新水性涂料有限公司 | A kind of silver-colored sealing wax of wet on wet sudden strain of a muscle |
| CN108192481A (en) * | 2017-12-26 | 2018-06-22 | 株洲市九华新材料涂装实业有限公司 | A kind of locomotive internal and external ornament aqueous polyurethane dull finishing coat and preparation method |
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