CN111777928A - Low-light alkali-resistant silver paint for household appliance color plates and preparation method thereof - Google Patents
Low-light alkali-resistant silver paint for household appliance color plates and preparation method thereof Download PDFInfo
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- CN111777928A CN111777928A CN202010683686.4A CN202010683686A CN111777928A CN 111777928 A CN111777928 A CN 111777928A CN 202010683686 A CN202010683686 A CN 202010683686A CN 111777928 A CN111777928 A CN 111777928A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D167/00—Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Coating compositions based on derivatives of such polymers
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/36—Pearl essence, e.g. coatings containing platelet-like pigments for pearl lustre
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/42—Gloss-reducing agents
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
- C09D7/62—Additives non-macromolecular inorganic modified by treatment with other compounds
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/08—Metals
- C08K2003/0812—Aluminium
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2237—Oxides; Hydroxides of metals of titanium
- C08K2003/2241—Titanium dioxide
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2265—Oxides; Hydroxides of metals of iron
- C08K2003/2272—Ferric oxide (Fe2O3)
Abstract
The application discloses a low-gloss alkali-resistant silver paint for household appliance color plates and a preparation method thereof, belonging to the field of color-coated steel plate paints. The coating comprises the following components in parts by weight: 50-55 parts of saturated polyester resin; 10-15 parts of amino resin; 0.5-1 part of defoaming auxiliary agent; 1-2 parts of a leveling agent; 0.5-1 part of an acid catalyst; 3-5 parts of surface-coated matting powder; 5-8 parts of resin coated aluminum powder; 8-10 parts of a solvent; 2-3 parts of color paste; 3-5 parts of pearl powder. The low-gloss alkali-resistant silvery coating adopts surface-coated matting powder and resin-coated aluminum powder which do not react with NaOH, so that the coating has good alkali resistance; meanwhile, the pearl powder is adopted to replace part of color paste, so that the color paste below the aluminum powder cannot be exposed, and the visual difference and the color difference are not generated on the surface of the coating.
Description
Technical Field
The application relates to the field of color-coated steel plate coatings, in particular to a low-gloss alkali-resistant silver coating for household appliance color plates and a preparation method thereof.
Background
The color coated steel plate is an organic coating steel plate and has the advantages of high strength, good corrosion resistance, convenient processing and forming, bright color, attractive appearance and the like. The color coated steel plate is widely applied to the fields of building industry, household appliances, transportation vehicles, furniture, office appliances and the like internationally, the color coated steel plate is mainly applied to the field of industrial buildings in China, the color plates used by civil buildings are few, the transportation industry is in the starting stage, the color plates used by the household appliance industry are just started to be accelerated, and meanwhile, the color coated steel plate is a large country for producing household appliances in China and has wide application prospect in the household appliance industry.
The household appliance color plate generally takes the electrogalvanizing plate and the cold plate as substrates and is used for producing washing machines, air conditioners, refrigerators, microwave ovens, water heaters, bread makers and the like. The color of the household appliance color plate is mainly white, gray and silver. Since each product is processed in different processes and used in different environments, the characteristics of color-coated products used in different home appliances are different, for example, a color sheet for a washing machine emphasizes corrosion resistance and detergent resistance, a color sheet for a refrigerator emphasizes surface quality and stain resistance, and heat resistance of products for microwave oven use is essential. However, in the household coil steel coating, an alkali resistance test is a conventional performance requirement, and the requirement that a color plate is soaked in a 5% NaOH solution for 24 hours at the temperature of 23-25 ℃ is that the surface does not blister and has no color difference change. In practice, however, the existing low-gloss silver paint has very poor alkali resistance because the low-gloss silver paint contains matting powder and aluminum powder, the matting powder is made of silicon dioxide, and the silicon dioxide reacts with NaOH to generate sodium silicate and water, so that the surface of a color plate is discolored; the aluminum powder can also react with NaOH to generate NaAlO2And water, wherein the color paste below the aluminum powder leaks out in a naked way to form visual difference. Therefore, the alkali resistance of the silver product of the household appliance seriously affects the surface glossiness of the silver product of the household appliance, thereby severely limiting the application range and the application environment of the silver product of the household appliance.
Disclosure of Invention
The low-light alkali-resistant silver paint for the household appliance color plate is used for meeting the alkali-resistant performance requirement, so that the glossiness of the surface of the color plate is ensured.
The second purpose of the application is to provide a preparation method of the low-gloss alkali-resistant silvery coating for the household appliance color plate so as to achieve the effect that the low-gloss alkali-resistant silvery coating prepared by the preparation method meets the alkali-resistant performance requirement.
The technical purpose of the application is realized by the following technical scheme:
the low-light alkali-resistant silver coating for the home appliance color plate comprises the following components in parts by weight:
50-55 parts of saturated polyester resin;
10-15 parts of amino resin;
0.5-1 part of defoaming auxiliary agent;
1-2 parts of a leveling agent;
0.5-1 part of an acid catalyst;
3-5 parts of surface-coated matting powder;
5-8 parts of resin coated aluminum powder;
8-10 parts of a solvent;
2-3 parts of color paste;
3-5 parts of pearl powder.
By adopting the technical scheme, different types of saturated polyester resins with different characteristics can be synthesized by adopting different polybasic acids and polyhydric alcohols. When the dihydric alcohol and the dibasic acid both having a linear structure are used, a polyester resin having only a linear structure is produced, and when the polybasic acid having a benzene ring is used, a polyester resin having a benzene ring structure is produced. The most common saturated polyester resin in the coating industry is a polyester resin containing a terminal hydroxyl functional group, and is cured into a film by crosslinking with resins such as isocyanate, amino resin and the like. The saturated polyester resin for producing the coil coating is adopted, and a coating film formed on a substrate has good decorative property, protective property, durability, application property and processing formability.
The paint film using amino resin as cross-linking agent has the advantages of excellent gloss, color retention, hardness, chemical resistance, water resistance and weather resistance. When an amino resin is used alone as a paint film, the paint film is too hard, brittle and poor in adhesion to a substrate, so that the paint film is usually used in combination with other types of resins which are compatible with the amino resin and crosslinkable, and can also be used as a crosslinking agent for saturated polyester resins, acrylic resins, epoxy esters and the like. The amino resin is used as a crosslinking agent of the saturated polyester resin, and is cured into a film under the action of the amino resin.
The defoaming auxiliary agent can prevent the generation of foam in the production and construction processes of the coating on one hand, and can quickly treat the foam generated in the process on the other hand, so that the flatness of the prepared coating on a substrate is ensured.
The leveling agent is added into the coating, so that the coating can form a flat, smooth and uniform coating film in the drying film-forming process, the surface tension of the coating liquid can be effectively reduced, and the leveling property and uniformity of the coating liquid are improved; can improve the permeability of the coating liquid, reduce the possibility of generating spots and stains during the brush coating, increase the coverage and ensure that the formed film is uniform and natural.
The acid catalyst is added into the coating to catalyze the reaction of the saturated polyester resin and the amino resin, and reaction conditions are provided for the crosslinking, curing and film forming between the saturated polyester resin and the amino resin.
The matting powder is widely applied to coatings, can control the surface gloss of a coating in a balanced manner, increases the wear resistance and scratch resistance of the coating, and has the advantages of dehumidification, deodorization, air purification, sound insulation, water resistance, heat insulation, permeability and the like. Depending on the application, a semi-gloss or matte coating material may be required, and examples of a matting agent generally used for reducing the gloss of a coating film to obtain a matting effect include ultrafine silica, talc, aluminum stearate, calcium stearate, and low-molecular thermoplastic resins. When the extinction powder made of silicon dioxide is selected, the silicon dioxide can react with NaOH to generate sodium silicate and water, so that the surface of the product is discolored. In order to solve the technical problem, the surface coating type extinction powder is adopted, and the silicon dioxide is coated with a layer, so that the silicon dioxide is isolated from NaOH, the reaction probability of the silicon dioxide and alkali is reduced, and the surface of a product is ensured to have no color difference change.
Aluminum powder, commonly known as "silver powder," is a silver-colored metallic pigment. The aluminum powder particles for the pigment are scaly, and the aluminum powder has metallic luster and shielding function just because of the state of the scaly particles. The color plate coating containing common aluminum powder can react with NaOH to generate NaAlO in an alkaline environment2And water, wherein the color paste below the aluminum powder leaks out in a naked way to form visual difference. Therefore, the aluminum powder is coated with the resin by selecting the resin-coated aluminum powder, so that the aluminum powder and NaOH are mixed inThe aluminum powder and the alkali are isolated, and the reaction probability of the aluminum powder and the alkali is reduced, so that the color paste is not exposed, and the visual difference is avoided.
The pearl pigment has a physical structure similar to pearl in cross section, wherein the inner core is mica with low optical refractive index, and the outer layer is coated with metal oxide with high refractive index, such as titanium dioxide or ferric oxide. The pearlescent pigment is uniformly dispersed in the coating and is distributed in a multilayer way parallel to the surface of the substance, and incident light can embody the pearlescent effect through multiple reflection and interference. The pearlescent pigment has the advantages of no toxicity, high temperature resistance, illumination resistance, acid and alkali resistance, no spontaneous combustion, no electric conduction, no migration and the like, and can partially replace or substitute optical absorption organic and inorganic pigments and optical reflection type metal pigments. Although the resin-coated aluminum powder and the surface-coated matting powder are adopted in the application, complete isolation reaction is difficult to achieve in actual operation, and after a paint film is formed on the aluminum paint, due to coexistence of the aluminum powder and other color pastes, any slight reaction still can cause the color paste under the aluminum powder to leak out in a naked manner, so that visual difference is formed. Therefore, in order to meet the requirement of alkali resistance, the pearl powder is used for replacing part of color paste, and the aluminum powder and the pearl powder are overlapped, so that the generation of visual difference is avoided.
In conclusion, the matting powder and the resin-coated aluminum powder with better coating performance are adopted, and meanwhile, the pearl powder is adopted to replace part of color paste, so that visual difference and color difference are not generated on the surface of the coating when slight reaction is generated.
Preferably, the low-light alkali-resistant silver paint for the home appliance color plate comprises the following components in parts by weight:
52-54 parts of saturated polyester resin;
12-14 parts of amino resin;
0.6-0.8 part of defoaming auxiliary agent;
1.2-1.8 parts of a leveling agent;
0.6-0.9 part of an acid catalyst;
3.5-4.5 parts of surface-coated matting powder;
6-7 parts of resin coated aluminum powder;
8.5-9.5 parts of a solvent;
2.2-2.8 parts of color paste;
3.5-4.5 parts of pearl powder.
Preferably, the low-light alkali-resistant silver paint for the home appliance color plate comprises the following components in parts by weight:
53 parts of saturated polyester resin;
13 parts of amino resin;
0.7 part of defoaming auxiliary agent;
1.5 parts of a leveling agent;
0.8 part of acid catalyst;
4 parts of surface coating type matting powder;
6.5 parts of resin coated aluminum powder;
9 parts of a solvent;
2.5 parts of color paste;
4 parts of pearl powder.
Preferably, the saturated polyester resin is one or more of NL345, NL385 and NL396 type saturated polyester resins. More preferably, the saturated polyester resin is NL345 type saturated polyester resin.
By adopting the technical scheme, the NL345, NL385 and NL396 type saturated polyester resins selected and used in the invention have good balance of hardness and toughness and good weather resistance, and can be compatible with amino resin, so that the resins are mutually crosslinked, cured and formed into a film under the action of the amino resin.
Preferably, the amino resin is one or more of CYMEL303LF, CYMEL308 and CYMEL327 type amino resins. More preferably, the amino resin is CYMEL303LF type amino resin.
By adopting the technical scheme, the CYMEL303LF, CYMEL308 and CYMEL327 type amino resins are very effective crosslinking agents, and particularly can provide good flexibility and formability for paint films when being crosslinked with polyester resins. In addition, the CYMEL303LF, CYMEL308 and CYMEL327 type amino resins have the advantages of excellent weight retention, no volatile solvent, good miscibility and solubility, excellent catalytic stability, excellent hardness/flexibility balance, rapid catalytic curing, cost economy and the like.
Preferably, the defoaming auxiliary agent is one or more of BYK057, BYK070 and BYK077 type defoaming auxiliary agents. More preferably, the defoaming auxiliary agent is BYK057 type defoaming auxiliary agent.
By adopting the technical scheme, the defoaming auxiliary agents of BYK054, BYK055 and BYK057 can prevent the solvent-based paint and the solvent-free paint from generating foam during production, charging and application. In addition, the BYK054, BYK055, and BYK057 type defoaming aids exhibit spontaneous defoaming performance and do not adversely affect interlayer adhesion when recoated.
Preferably, the leveling agent is an acrylic leveling agent. More preferably, the acrylic leveling agent is selected from one or more of BYK-354, BYK-358 and BYK-388 type leveling agents.
By adopting the technical scheme, the BYK-354, BYK-358 and BYK-388 flatting agents have strong leveling property, can eliminate shrinkage cavities, simultaneously have the functions of defoaming and defoaming agents, and do not influence the interlayer adhesion.
Preferably, the acid catalyst is one or more of King N2500, King N5225 and King N5228 type acid catalysts. More preferably, the acid catalyst is King N2500 acid catalyst.
By adopting the technical scheme, the King N2500, King N5225 and King N5228 type acid catalysts selected by the application do not interact with pigments, and have good influence on the adhesion, corrosion resistance, flexibility and impact resistance of the coating.
Preferably, the surface-coated matting powder is one or more of ACEMATT3300, ACEMATT EXP3400 and ACEMATTAXP 3600 type matting powder. More preferably, the surface-coated matting powder is ACEMATTEXP3400 matting powder.
By adopting the technical scheme, the ACEMATT3300, ACEMATT EXP3400 and ACEMATTAXP 3600 type matting powder selected by the application has high matting efficiency, high transparency, fine hand feeling and good skin feel.
Preferably, the resin-coated aluminum powder is one or more of FZ-EV120, FZ-EV170 and FZ-EV190 type aluminum powder. More preferably, the resin-coated aluminum powder is FZ-EV120 type aluminum powder.
By adopting the technical scheme, the FZ-EV120, FZ-EV170 and FZ-EV190 aluminum powder is obtained by coating the surfaces of aluminum scales with acrylic resin, and has good coating property, excellent acid and alkali corrosion resistance, excellent adhesion and excellent insulating property.
Preferably, the solvent is one or more of cyclohexanone, S-150 aromatic hydrocarbon solvent and PMA solvent.
By adopting the technical scheme, the saturated polyester resin, the amino resin, the surface-coated extinction powder, the resin-coated aluminum powder, the color paste and the pearl powder in the paint have good dissolubility in cyclohexanone, S-150 aromatic solvent and PMA solvent, so that the obtained paint has good uniformity.
Preferably, the pearl powder is selected from one or two of KC303 and KC 524.
By adopting the technical scheme, the KC303 and KC524 pearlescent powders are gorgeous in color, so that the color plate product has elegant gloss and color. In addition, the paint is uniformly dispersed in a solvent, has no floc, and ensures the flatness of the surface of the paint.
A preparation method of a low-light alkali-resistant silver coating for a home appliance color plate comprises the following steps:
a. respectively soaking the resin-coated aluminum powder and the pearl powder in a solvent for 3-5 hours;
b. mixing and uniformly stirring saturated polyester resin, amino resin, a defoaming auxiliary agent, a flatting agent, an acid catalyst, surface-coated matting powder and color paste at 1000-1500r/min for 20-40 min;
c. and (c) respectively adding the resin-coated aluminum powder and the pearl powder soaked in the step (a) into the resin mixture in the step (b), stirring again at the stirring speed of 1000-1500r/min, and dispersing for 20-40 min.
By adopting the technical scheme, the prepared low-gloss alkali-resistant silvery coating has good alkali resistance, and the surface of a product cannot generate no foaming and color difference change.
In summary, the present application has the following beneficial effects:
1. the coating adopts the extinction powder and the resin-coated aluminum powder with better coating property, does not react with NaOH, and has good alkali resistance;
2. the coating adopts the pearl powder to replace part of color paste, so that the color paste below the aluminum powder cannot be leaked in a naked way when the coating generates a slight reaction, and the surface of the coating does not generate visual difference and color difference;
3. the operation steps of the preparation method of the low-gloss alkali-resistant silvery coating fully meet the technical requirements of customers on alkali resistance of products, and the preparation method is suitable for industrial production.
Detailed Description
The present application will be described in further detail with reference to examples.
Saturated polyester resins of NL345, NL385, NL396, according to the present application, are available from shanghai kang chemicals ltd;
the aluminum powder of FZ-EV120, FZ-EV170 and FZ-EV190 types herein was purchased from Toyo aluminum Co Ltd;
the KC303 and KC524 pearl powders of the present application are available from annex kuncai materials science and technology limited.
Example 1
A preparation method of a low-light alkali-resistant silver coating for a home appliance color plate comprises the following steps:
a. equally dividing 8kg of S-150 aromatic solvent into two parts, and respectively soaking 5kg of FZ-EV120 resin coated aluminum powder and 5kg of KC303 pearl powder in the solvent for 3 hours;
b. mixing 55kg of NL345 saturated polyester resin, 10kg of CYMEL308 amino resin, 1kg of BYK057 defoaming auxiliary agent, 1kg of BYK-354 flatting agent, 1kg of King N5228 acid catalyst, 3kg of ACEMATT3300 surface-coated matting powder and 3kg of color paste, uniformly stirring at 1000r/min, and dispersing for 40 min;
c. and (c) respectively adding the resin-coated aluminum powder and the pearl powder soaked in the step (a) into the resin mixture obtained in the step (b), stirring again at the stirring speed of 1000r/min, and dispersing for 40 min.
Example 2
A preparation method of a low-light alkali-resistant silver coating for a home appliance color plate comprises the following steps:
a. equally dividing 10kg of S-150 aromatic solvent into two parts, and respectively soaking 8kg of FZ-EV120 resin coated aluminum powder and 3kg of KC303 pearl powder in the solvent for 5 hours;
b. mixing and uniformly stirring 50kg of NL345 saturated polyester resin, 15kg of CYMEL308 amino resin, 0.5kg of BYK070 defoaming auxiliary agent, 2kg of BYK-358 flatting agent, 0.5kg of King N5225 acid catalyst, 5kg of ACEMATT EXP3600 surface-coated matting powder and 2kg of color paste at 1500r/min, and dispersing for 20 min;
c. and (c) respectively adding the resin-coated aluminum powder and the pearl powder soaked in the step (a) into the resin mixture obtained in the step (b), stirring again at the stirring speed of 1500r/min, and dispersing for 20 min.
Example 3
A preparation method of a low-light alkali-resistant silver coating for a home appliance color plate comprises the following steps:
a. equally dividing 8.5kg of PMA solvent into two parts, respectively soaking 6kg of FZ-EV170 resin coated aluminum powder and 4.5kg of KC303 pearl powder in the solvent for 3.5 hours;
b. 52kg of NL385 saturated polyester resin, 14kg of CYMEL327 amino resin, 0.6kg of BYK077 defoaming auxiliary agent, 1.8kg of BYK-358 leveling agent, 0.6kg of King N5225 acid catalyst, 4.5kg of ACEMATT EXP3400 surface-coated matting powder and 2.2kg of color paste are mixed and stirred uniformly at 1200r/min and dispersed for 35 min;
c. and (c) respectively adding the resin-coated aluminum powder and the pearl powder soaked in the step (a) into the resin mixture obtained in the step (b), stirring again at the stirring speed of 1200r/min, and dispersing for 35 min.
Example 4
A preparation method of a low-light alkali-resistant silver coating for a home appliance color plate comprises the following steps:
a. equally dividing 9.5kg of PMA solvent into two parts, respectively soaking 7kg of FZ-EV170 resin coated aluminum powder and 3.5kg of KC524 pearl powder in the solvent for 4.5 hours;
b. mixing and stirring uniformly 54kg of NL385 saturated polyester resin, 12kg of CYMEL303LF amino resin, 0.8kg of BYK077 defoaming auxiliary agent, 1.2kg of BYK-388 flatting agent, 0.9kg of King N5228 acid catalyst, 3.5kg of ACEMATT EXP3400 surface-coated matting powder and 2.8kg of color paste, and dispersing for 25min at 1400 r/min;
c. and (c) respectively adding the resin-coated aluminum powder and the pearl powder soaked in the step (a) into the resin mixture obtained in the step (b), stirring again at the stirring speed of 1400r/min, and dispersing for 25 min.
Example 5
A preparation method of a low-light alkali-resistant silver coating for a home appliance color plate comprises the following steps:
a. equally dividing 9kg of cyclohexanone into two parts, respectively soaking 6.5kg of FZ-EV120 resin coated aluminum powder and 4kg of KC524 pearl powder in a solvent for 4 hours;
b. mixing and uniformly stirring 53kg of NL396 saturated polyester resin, 13kg of CYMEL303LF amino resin, 0.7kg of BYK057 defoaming auxiliary agent, 1.5kg of BYK-388 flatting agent, 0.8kg of King N2500 acid catalyst, 4kg of ACEMATT EXP3400 surface-coated matting powder and 2.5kg of color paste, 1300r/min and dispersing for 30 min;
c. and (c) respectively adding the resin-coated aluminum powder and the pearl powder soaked in the step (a) into the resin mixture obtained in the step (b), stirring again at the stirring speed of 1300r/min, and dispersing for 30 min.
Comparative example 1
The preparation method of the low-light alkali-resistant silver coating for the home appliance color plate is different from the preparation method of the low-light alkali-resistant silver coating in example 1 in that: and replacing the resin-coated aluminum powder with common aluminum powder.
Comparative example 2
The preparation method of the low-light alkali-resistant silver coating for the home appliance color plate is different from the preparation method of the low-light alkali-resistant silver coating in example 1 in that: the surface coating type matting powder is replaced by the common silicon dioxide matting powder.
Comparative example 3
The preparation method of the low-light alkali-resistant silver coating for the home appliance color plate is different from the preparation method of the low-light alkali-resistant silver coating in example 1 in that: the resin-coated aluminum powder is replaced by common aluminum powder, and the surface-coated matting powder is replaced by common silicon dioxide matting powder.
Comparative example 4
A preparation method of a low-light alkali-resistant silver coating for a home appliance color plate comprises the following steps:
a. 8kg of resin-coated aluminum powder is soaked in 10kg of solvent for 5 hours;
b. mixing 50kg of saturated polyester resin, 15kg of amino resin, 0.5kg of defoaming auxiliary agent, 2kg of flatting agent, 0.5kg of acid catalyst, 5kg of surface-coated matting powder and 5kg of color paste, uniformly stirring at 1500r/min, and dispersing for 20 min;
c. and (c) adding the resin coated aluminum powder soaked in the step (a) into the resin mixture in the step (b), stirring again, wherein the stirring speed is 1500r/min, and dispersing for 20 min.
Comparative example 5
A preparation method of a low-light alkali-resistant silver coating for a home appliance color plate comprises the following steps:
a. soaking 6kg of aluminum powder in 8.5kg of solvent for 3.5 hours;
b. 52kg of saturated polyester resin, 14kg of amino resin, 0.6kg of defoaming auxiliary agent, 1.8kg of flatting agent, 0.6kg of acid catalyst, 4.5kg of surface-coated matting powder and 6.7kg of color paste are mixed and stirred uniformly at 1200r/min and dispersed for 35 min;
c. and (c) adding the aluminum powder soaked in the step (a) into the resin mixture in the step (b), stirring again, wherein the stirring speed is 1200r/min, and dispersing for 35 min.
Comparative example 6
A preparation method of a low-light alkali-resistant silver coating for a home appliance color plate comprises the following steps:
a. soaking 7kg of resin-coated aluminum powder in 9.5kg of solvent for 4.5 hours;
b. mixing and stirring 54kg of saturated polyester resin, 12kg of amino resin, 0.8kg of defoaming auxiliary agent, 1.2kg of flatting agent, 0.9kg of acid catalyst, 3.5kg of matting powder and 6.3kg of color paste uniformly, and dispersing for 25min at 1400 r/min;
c. and (c) adding the resin coated aluminum powder soaked in the step (a) into the resin mixture in the step (b), stirring again, wherein the stirring speed is 1400r/min, and dispersing for 25 min.
Comparative example 7
A preparation method of a low-light alkali-resistant silver coating for a home appliance color plate comprises the following steps:
a. soaking 6.5kg of aluminum powder in 9kg of solvent for 4 hours;
b. mixing 53kg of saturated polyester resin, 13kg of amino resin, 0.7kg of defoaming auxiliary agent, 1.5kg of flatting agent, 0.8kg of acid catalyst, 4kg of matting powder and 6.5kg of color paste, uniformly stirring, 1300r/min and dispersing for 30 min;
c. and (c) adding the aluminum powder soaked in the step (a) into the resin mixture in the step (b), stirring again, wherein the stirring speed is 1300r/min, and dispersing for 30 min.
Performance testing
The hardness of the color plate of the present application is tested with reference to ASTM D3363;
the gloss of the color panels of the present application was tested with reference to ASTM D523;
the reverse impact performance of the color sheet of the present application is tested with reference to ASTM D2794;
the T-bend performance of the color panels of the present application was tested in accordance with ASTM D4145;
the cup convexity performance of the color plate is tested according to GB/T9753;
the method for testing the alkali resistance of the color plate comprises the following steps: soaking the coating in 5% sodium hydroxide at the temperature of 23-25 ℃ for 24 hours, and observing whether the surface of the coating foams or not and the color changes obviously visually;
the method for testing the acid resistance of the color plate comprises the following steps: and soaking the coating in 5% sulfuric acid at the temperature of 23-25 ℃ for 24 hours, and observing whether the surface of the coating has bubbles or not and the color is obviously changed visually.
As can be seen from Table 1, the low-gloss alkali-resistant silvery paint prepared in examples 1 to 5 has good acid and alkali resistance, does not generate visual difference, can meet the technical requirements of customers on alkali resistance of color plates, and expands the application range of the low-gloss silvery paint.
Comparative example 1 differs from example 1 in that the resin-coated aluminum powder was replaced with ordinary aluminum powder. As can be seen from Table 1, in the alkali resistance test, the product of comparative example 1 was foamed on the surface and varied in color difference; comparative example 1 in acid resistance testThe product surface is likewise foamed and changes in color difference are formed. Experimental results show that the aluminum powder in the comparative example 1 can react with NaOH to generate NaAlO2And water, and meanwhile, because the aluminum powder reacts, color paste existing below the aluminum powder leaks out to form visual difference. Further, the aluminum powder was also reacted with 5% sulfuric acid to produce Al2（SO4）3And H2And color paste existing below the aluminum powder leaks out to form color difference change.
Comparative example 2 differs from example 1 in that the surface-coated matting powder was replaced with a general silica matting powder. As can be seen from Table 1, in the alkali resistance test, the product of comparative example 2 has blistered surface and formed color difference change; the product of comparative example 2 had no blistering and no change in color difference on the acid resistance test. The experimental results show that the silicon dioxide matting powder in comparative example 2 can react with NaOH to generate sodium silicate and water, which causes surface discoloration. And the silicon dioxide is an atomic crystal, is used as an acidic oxide, has stable chemical property, does not react with 5 percent sulfuric acid, and does not cause the surface of a product to discolor.
Comparative example 3 differs from example 1 in that the resin-coated aluminum powder was replaced with a normal aluminum powder, and the surface-coated matting powder was replaced with a normal matting powder. As can be seen from Table 1, in the alkali resistance test, the product of comparative example 3 has serious surface bubble generation and color difference change; in the acid resistance test, the product of comparative example 3 was foamed on the surface and developed a color difference change. Experimental results show that the aluminum powder in the comparative example 3 can react with NaOH to generate NaAlO2And the aluminum powder reacts with the water, so that color paste existing below the aluminum powder leaks out to form visual difference. Meanwhile, the silica matting powder in comparative example 1 can also react with NaOH to generate sodium silicate and water, causing surface discoloration. Further, the aluminum powder was also reacted with 5% sulfuric acid to produce Al2（SO4）3And H2And color paste existing below the aluminum powder leaks out to form color difference change. And the silicon dioxide is an atomic crystal, is used as an acidic oxide, has stable chemical property, does not react with 5 percent sulfuric acid, and does not cause the surface of a product to discolor.
Comparative example 4 differs from example 2 in that no pearlescent powder is added to the coating. As can be seen from Table 1, the product of comparative example 4 had slightly blistered surfaces and slightly varied color differences in the alkali resistance test; in the acid resistance test, the product surface was likewise slightly blistered, with slight color difference changes. The experimental result shows that although the surface coating type matting powder is adopted as the matting powder, and the resin coating type aluminium powder is adopted as the aluminium powder, complete isolation reaction is difficult to achieve, the probability of reaction with alkali or acid still exists, and the aluminium powder and the pearl powder cannot generate a superposition effect and cannot avoid the generation of visual difference because the pearl powder does not exist in the coating.
Comparative example 5 is different from example 3 in that no pearl powder was added to the paint, and the resin-coated aluminum powder was replaced with ordinary aluminum powder. As can be seen from Table 1, in the alkali resistance test, the product of comparative example 5 has many bubbles on the surface and the color difference changes obviously; in an acid resistance test, a plurality of bubbles are also arranged on the surface of the product, and the color difference change is obvious. Experimental results show that the aluminum powder in the comparative example 5 can react with NaOH to generate NaAlO2And water, and meanwhile, because the aluminum powder reacts, color paste existing below the aluminum powder leaks out to form visual difference. Further, the aluminum powder was also reacted with 5% sulfuric acid to produce Al2（SO4）3And H2And color paste existing below the aluminum powder leaks out to form color difference change. In addition, because no pearl powder exists in the coating, the aluminum powder and the pearl powder cannot generate a superposition effect, and the visual difference is more serious.
Comparative example 6 differs from example 4 in that no pearl powder was added to the coating, and the surface-coated matting was replaced with a conventional silica matting. As can be seen from Table 1, in the alkali resistance test, the product of comparative example 6 has bubbles on the surface and the color difference changes; in the acid resistance test, the surface had no blistering and no color difference change. The experimental results show that the silicon dioxide matting powder in comparative example 1 can react with NaOH to generate sodium silicate and water, which causes surface discoloration. And the silicon dioxide is an atomic crystal, is used as an acidic oxide, has stable chemical property, does not react with 5 percent sulfuric acid, and does not cause the surface of a product to discolor.
Comparative example 7 is different from example 5 in that no pearl powder was added to the paint, and the resin-coated aluminum powder was replaced with ordinary aluminum powder,the surface coating type matting powder is replaced by common silicon dioxide matting powder. As can be seen from Table 1, in the alkali resistance test, the surface bubble generation and color difference change of the product in comparative example 7 are very serious; in the acid resistance test, the surface of the product in comparative example 7 had many bubbles, and the color difference varied significantly. Experimental results show that the aluminum powder in the comparative example 7 can react with NaOH to generate NaAlO2And the aluminum powder reacts with the water, so that color paste existing below the aluminum powder leaks out to form visual difference. Meanwhile, the silica matting powder in comparative example 7 can also react with NaOH to generate sodium silicate and water, causing surface discoloration. Further, the aluminum powder was also reacted with 5% sulfuric acid to produce Al2（SO4）3And H2And color paste existing below the aluminum powder leaks out to form color difference change. And the silicon dioxide is an atomic crystal, is used as an acidic oxide, has stable chemical property, does not react with 5 percent sulfuric acid, and does not cause the surface of a product to discolor. In addition, because no pearl powder exists in the paint, the aluminum powder and the pearl powder cannot generate a superposition effect, and the visual difference is very serious.
The embodiments of the present invention are preferred embodiments of the present application, and the scope of protection of the present application is not limited by the embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (10)
1. The utility model provides a low-light alkali-resistant silvery coating of household appliance color plate which characterized in that: the paint comprises the following components in parts by weight:
50-55 parts of saturated polyester resin;
10-15 parts of amino resin;
0.5-1 part of defoaming auxiliary agent;
1-2 parts of a leveling agent;
0.5-1 part of an acid catalyst;
3-5 parts of surface-coated matting powder;
5-8 parts of resin coated aluminum powder;
8-10 parts of a solvent;
2-3 parts of color paste;
3-5 parts of pearl powder.
2. The low-gloss alkali-resistant silver paint for home appliance color plates as claimed in claim 1, wherein: the paint comprises the following components in parts by weight:
52-54 parts of saturated polyester resin;
12-14 parts of amino resin;
0.6-0.8 part of defoaming auxiliary agent;
1.2-1.8 parts of a leveling agent;
0.6-0.9 part of an acid catalyst;
3.5-4.5 parts of surface-coated matting powder;
6-7 parts of resin coated aluminum powder;
8.5-9.5 parts of a solvent;
2.2-2.8 parts of color paste;
3.5-4.5 parts of pearl powder.
3. The low-gloss alkali-resistant silver paint for home appliance color plates as claimed in claim 1, wherein: the paint comprises the following components in parts by weight:
53 parts of saturated polyester resin;
13 parts of amino resin;
0.7 part of defoaming auxiliary agent;
1.5 parts of a leveling agent;
0.8 part of acid catalyst;
4 parts of surface coating type matting powder;
6.5 parts of resin coated aluminum powder;
9 parts of a solvent;
2.5 parts of color paste;
4 parts of pearl powder.
4. The low-gloss alkali-resistant silver paint for home appliance color plates as claimed in any one of claims 1 to 3, wherein: the amino resin is one or more of CYMEL303LF, CYMEL308 and CYMEL327 type amino resin.
5. The low-gloss alkali-resistant silver paint for home appliance color plates as claimed in any one of claims 1 to 3, wherein: the leveling agent is an acrylic leveling agent.
6. The low-gloss alkali-resistant silver paint for home appliance color plates as claimed in any one of claims 1 to 3, wherein: the surface coating type matting powder is one or more of ACEMATT3300, ACEMATT EXP3400 and ACEMATT EXP3600 type matting powder.
7. The low-gloss alkali-resistant silver paint for home appliance color plates as claimed in any one of claims 1 to 3, wherein: the resin-coated aluminum powder is one or more of resin-coated aluminum powder FZ-EV120, resin-EV 170 and resin-coated aluminum powder FZ-EV 190.
8. The low-gloss alkali-resistant silver paint for home appliance color plates as claimed in any one of claims 1 to 3, wherein: the solvent is one or more of cyclohexanone, S-150 aromatic hydrocarbon solvent and PMA solvent.
9. The low-gloss alkali-resistant silver paint for home appliance color plates as claimed in any one of claims 1 to 3, wherein: the pearl powder is selected from one or two of KC303 and KC524 pearl powders.
10. A method for preparing the low-gloss alkali-resistant silver paint for the color plates of the household appliances, which is characterized by comprising the following steps: the method comprises the following steps:
a. respectively soaking the resin-coated aluminum powder and the pearl powder in a solvent for 3-5 hours;
b. mixing and uniformly stirring saturated polyester resin, amino resin, a defoaming auxiliary agent, a flatting agent, an acid catalyst, surface-coated matting powder and color paste at 1000-1500r/min for 20-40 min;
c. and (c) respectively adding the resin-coated aluminum powder and the pearl powder soaked in the step (a) into the resin mixture in the step (b), stirring again at the stirring speed of 1000-1500r/min, and dispersing for 20-40 min.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112795283A (en) * | 2020-12-31 | 2021-05-14 | 山东富海材料科技有限公司 | Anticorrosive heat-insulating coil coating applied to color steel plate and preparation method thereof |
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| CN102977708A (en) * | 2012-11-16 | 2013-03-20 | 苏州嘉乐威企业发展有限公司 | Water-soluble stoving varnish suitable for craft glass products and preparation method thereof |
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