CN110791183B - Matte finish paint composition and application thereof - Google Patents
Matte finish paint composition and application thereof Download PDFInfo
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- CN110791183B CN110791183B CN201911133250.1A CN201911133250A CN110791183B CN 110791183 B CN110791183 B CN 110791183B CN 201911133250 A CN201911133250 A CN 201911133250A CN 110791183 B CN110791183 B CN 110791183B
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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
- 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
- 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
- C09D7/65—Additives macromolecular
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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
- C09D7/70—Additives characterised by shape, e.g. fibres, flakes or microspheres
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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
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/003—Additives being defined by their diameter
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/14—Polymer mixtures characterised by other features containing polymeric additives characterised by shape
- C08L2205/18—Spheres
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Abstract
The invention discloses a matte finish paint composition which comprises the following raw materials in parts by weight: 30-70 parts of polyester resin, 1-30 parts of amino resin, 10-40 parts of solvent, 4-20 parts of flatting agent and 10-40 parts of other components; the flatting agent comprises 2-8 parts of organic pigment, 2-8 parts of organic microspheres and 0-4 parts of wax substances; wherein the extender pigment comprises silicon dioxide matting powder. The finish paint composition has compact finish paint coating, strong adhesive force, excellent acid and alkali discoloration resistance and bubbling resistance, and also has good rheological property and construction performance.
Description
Technical Field
The present invention relates to decorative coating compositions. More particularly, relates to a matte finish paint composition and application thereof.
Background
In recent years, with the advent of the rapid consumer age, more and more customers prefer to use integrated, lightweight color-coated sheets. Meanwhile, along with the continuous improvement of living standard of people, in addition to paying attention to performance, the attention of people to the surface effect of color and coating is higher and higher. Wherein, the products of the matte products are more and more popular with common consumers, the gloss (60 ℃) of the paint film of the matte coating is lower than 15, and the matte coating can not cause optical pollution because of lower reflection coefficient, and is gradually accepted by the market. In particular to a household appliance matte product, the paint surface is softer, the paint film is more elegant, and the high-gloss product has more texture. Meanwhile, the matte paint has wear resistance and scratch resistance slightly superior to the high gloss paint, so the matte paint has certain market requirements.
In general, for a coating composition to be used as a decorative coating, the composition must exhibit good chemical resistance requirements and processing requirements. Especially for the matte or lower gloss finish coat of household appliances, the acid and alkali resistance discoloration and the processing performance are very important and outstanding. However, most current coatings that have been reduced in gloss with silica matting agents tend to resist alkali discoloration and blistering, and the use of silica to produce a higher matting effect comes at the expense of a substantial increase in system viscosity and thixotropy, with excessive thixotropy being undesirable in most cases. In the prior art, aerosol silica flatting agent is used for replacing the traditional precipitation method silica flatting agent, and the phenomenon of gloss rise or non-uniformity is solved during high-speed roll coating construction. However, the problem of how to improve the processability and acid and alkali resistance of the coating while reducing the gloss is not solved.
Therefore, it is desirable to provide a matte finish having lower gloss, good processability and good acid and base resistance.
Disclosure of Invention
The matte finishing paint composition comprises polyester resin, amino resin, a solvent, a flatting agent and other components, wherein the flatting agent comprises silicon dioxide flatting powder and organic microspheres; the matte finish paint composition has low gloss and good alkali resistance and processability.
The invention also aims to provide application of the matte finishing paint composition.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the invention provides a matte finish paint composition, which comprises the following raw materials in parts by weight:
30-70 parts of polyester resin, 1-30 parts of amino resin, 10-40 parts of solvent, 4-20 parts of flatting agent and 10-40 parts of other components;
the flatting agent comprises 2-8 parts of organic pigment, 2-8 parts of organic microspheres and 0-4 parts of wax substances; wherein the extender pigment comprises silicon dioxide matting powder.
Optionally, the particle size of the silicon dioxide matting powder is less than or equal to 15 μm, the porosity is 0.1-2.2ml/g, and the surface of the silicon dioxide matting powder is modified by a treatment agent. The modification method is not limited to a chemical deposition or physical chemical adsorption method, and one or more layers of inorganic substance films, low molecular weight organic substance films or inorganic organic composite films are formed on the surface of the silicon dioxide matting powder. Preferably, the treating agent comprises one or more of a silane coupling agent, organosilicon thiol, high molecular polyethylene wax and tetrafluoroethylene, and more preferably, the treating agent is high molecular polyethylene wax or a silane coupling agent.
Optionally, the organic micro-particleThe particle diameter of the ball is less than or equal to 15 mu m, and the true density is 1.3-1.8g/cm3，
Optionally, the organic microspheres are highly cross-linked, solvent-resistant, high temperature-resistant organic microspheres.
Alternatively, the polyester resin has an acid value of 0 to 10mg KOH/g, a hydroxyl value of 30 to 75mg KOH/g, a solid content of 45 to 75 wt%, and a molecular weight of 2000-7000; preferably, the polyester resin has an acid value of 0-8mg KOH/g, a hydroxyl value of 40-65mg KOH/g, a solid content of 50-65 wt%, and a molecular weight of 2500-.
Optionally, the organic microspheres are selected from at least one of polymethyl (meth) acrylate microspheres, polyurethane microspheres, poly (meth) urea-formaldehyde resins, silicone microspheres, polystyrene microspheres. Preferably, the organic microspheres are highly cross-linked, solvent-resistant and excellent in high-temperature resistance, wherein the weight ratio of the polymethyl (meth) acrylate microspheres to the poly (meth) urea-formaldehyde resin microspheres to the polystyrene microspheres is 1-3: 1-3: 0-1.
Optionally, the extender pigment further comprises at least one of diatomite, kaolin, aluminum hydroxide, montmorillonite, calcium carbonate, asbestos powder and mica powder; the wax is selected from palm wax, beeswax, lanolin, ceresin, and synthetic wax.
Optionally, the amino resin is selected from at least one of melamine formaldehyde resin, methylated urea formaldehyde resin, methylated melamine resin, butylated urea formaldehyde resin, butylated melamine resin and benzoguanamine formaldehyde resin; preferably, the amino resin is selected from methylated melamine resin and/or butylated melamine resin.
Optionally, the solvent is at least one selected from cyclohexanone, propylene glycol methyl ether acetate, xylene, butyl acetate, S-100 solvent oil, trimethylbenzene solvent oil and 2-butanone.
Optionally, the other components include pigments, acid catalysts, adhesion promoters, leveling agents, defoamers, and catalysts.
In a second aspect, the present invention provides the use of a matte finish composition for making a coating.
The invention has the following beneficial effects:
the matte finish composition comprises polyester resin with a special molecular structure and a matting agent with specific particle size, proportion and surface treatment, and the formed finish coating is compact and strong in adhesive force, has excellent acid-base discoloration resistance and bubbling resistance, and also has good rheological property and construction performance.
Detailed Description
In order to make the technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be further described in detail with reference to specific embodiments. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and is not to be taken as limiting the scope of the invention.
In the case where the objects of the present invention are illustrated and explained by the following examples, the components of the composition are all explained on the general standard of parts by weight. In the present invention, the term "part" is used in the same sense as part by weight for the sake of brevity without specific mention.
The invention provides a matte finish paint composition which comprises the following raw materials in parts by weight:
30-70 parts of polyester resin, 1-30 parts of amino resin, 10-40 parts of solvent, 4-20 parts of flatting agent and 10-40 parts of other components;
the flatting agent comprises 2-8 parts of organic pigment, 2-8 parts of organic microspheres and 0-4 parts of wax substances; wherein the extender pigment comprises silicon dioxide matting powder.
The usual influences on the chemical resistance of paint films mainly include: compactness of a finish paint film, a molecular structure of finish paint resin and adhesion of the finish paint and the primer. The less dense the paint film, the more easily the chemical penetrates, resulting in deterioration of the chemical. After the paint film is heated and cured, if the wettability between the paint film and the pigment is poor due to volume shrinkage, tiny gaps can be caused, and for a matte paint film, the more pigments and fillers are added, the higher the pigment ratio is, the more micropores are, and the poorer the integral compactness of the paint film is. The molecular structure of the polyester resin preferentially selected by the invention can improve the wetting property of the pigment, and the hydrophobicity is improved through the hydrophobic chain segment, so that the ester group is protected, and the hydrolysis is prevented. Meanwhile, by adding the flexible organic microspheres, the wettability of the organic microspheres with resin can be improved, the flexible organic microspheres can maintain the dynamic mechanical properties similar to those of a resin system, and the generation of micropores is reduced. Furthermore, because the molecular structures and chemical resistance of the organic microspheres are different, the types and proportions of the organic microspheres need to be reasonably selected. The invention optimizes and screens the types and proportion of flexible organic microspheres and reduces the use of inorganic silicon dioxide by the design of a resin system, thereby achieving the purpose of improving the chemical resistance, especially the acid and alkali resistance.
In the present invention, the silica matting agent may comprise one or more silica matting agents capable of producing the desired effect of alkali-resistant non-discolouration/or slight discolouration/gloss of the paint film. The silica matting powder may comprise surface treated particles having a porosity (pore volume) of from 0.1 to 2.2ml/g, for example a particle size of no more than 15 microns, more preferably no more than 10 microns. If a matting agent is used, preferably the silica matting agent is present in the top coat composition in an amount of no more than 8 parts, more preferably no more than 6 parts, and even more preferably no more than 5 parts by weight, based on the total weight of the coating composition. The surface of the preferred silicon dioxide matting powder is modified by a treating agent. The treatment method is not limited to the method of chemical deposition or physical chemical adsorption, and one or more layers of inorganic substance films, low molecular weight organic substance films, or inorganic organic composite films are formed. Preferably, the treating agent comprises one or more of silane coupling agent, organosilicon thiol, high molecular polyethylene wax, tetrafluoroethylene and the like, and the acid-base balance and the surface hydrophobicity of the silica surface can be adjusted through surface treatment, so that the agglomeration force among particles is reduced, and the dispersibility and the dispersion stability of the silica in paint are improved. In some cases, the rheological property of the coating is influenced to a certain extent, and the performance of the coating film is improved. In the invention, more preferably, the silicon dioxide matting powder is treated by macromolecular polyethylene wax and a silane coupling agent, and has relatively excellent dispersing performance and alkali resistance, low viscosity of a coating system, easy construction, ideal suspension property, uniform surface luminosity after film forming, fine and smooth hand feeling and excellent scratch resistance.
In some preferred examples, the matting agent further comprises organic microspheres, and after the spherical micro powder is added into the coating, tiny unevenness can be formed on the surface of the coating, and the tiny unevenness can play a good role in matting because the tiny unevenness has a scattering effect on light. Meanwhile, the organic microspheres can be used as a surface scratch-resistant agent, wear-resistant powder and sand powder due to good scratch resistance. Because the micro powder is in a uniform spherical shape, the micro powder can slide, so that the product can have better touch feeling, a paint layer is provided with excellent smooth hand feeling, and the texture of the paint surface is further improved. Typically, the organic microspheres include at least one of polymethyl (meth) acrylate microspheres (PMMA), polyurethane microspheres (PU), poly (meth) urea-formaldehyde resin (PMU), silicone microspheres, polystyrene microspheres, and the like.
Organic microspheres suitable for use with the compositions described herein are known to those skilled in the art and may vary depending on the desired gloss or appearance of the coating. If organic microspheres are used, the organic microspheres which are highly crosslinked, solvent-resistant and excellent in high-temperature resistance can be preferably included, so that better heat aging resistance and discoloration resistance of a paint film can be provided, and good construction stability and storage stability of the finish paint composition can be provided. In addition, the organic microspheres preferably have a true density of 1.3 to 1.8g/cm3E.g. a particle size of not more than 15 microns, more preferably not more than 10 microns. Second, preferably, the organic microspheres are present in the topcoat composition in an amount of no more than 8 parts by weight, more preferably no more than 6 parts by weight, even more preferably no more than 5 parts by weight, based on the total weight of the coating composition.
In a preferred example, the weight ratio of the polymethyl (meth) acrylate microspheres, the poly (meth) urea-formaldehyde resin and the polystyrene microspheres in the organic microspheres is 1-3: 1-3: 0-1.
The polyester resin in the present invention can be generally considered to be a saturated polyester resin, that is, a polyester resin having a terminal hydroxyl functional group, which is crosslinked with a resin such as an amino resin to be cured into a film. When the saturated polyester resin is used for preparing the coating, the coating has excellent bonding performance and good balance performance of hardness and toughness. The saturated polyester resin used for the primer has the characteristics of good adhesive force, strong universality, and outstanding weather resistance and flexibility. Meanwhile, the preferable polyester coating has excellent flexibility, good wetting performance of resin and pigment and overbaking resistance. The saturated polyester resins which can be used in the present invention generally have an acid number of 10mg KOH/g or less, preferably 8mg KOH/g or less, more preferably 6mg KOH/g or less; having a hydroxyl number of from 30 to 75mg KOH/g, preferably from 40 to 65mg KOH/g; has a solids content of 45 to 75 wt.%, preferably 50 to 65 wt.%. And a number average molecular weight of 2000-. At present, a plurality of manufacturers provide and sell saturated polyester resin on the market, and the saturated polyester resin can also be self-produced resin of the company. Saturated polyester resins that can be used in the present invention include, for example, those produced by Toyobo, Evonik, Arkema, Changxing, Kolida, Benzhu, etc., and specific types include GK36CS, GK88CS, EP132N, 96055MY, 50694-R-50, K4030, BCR5006F, etc., including Cyster 301 produced by Nippon, and other similar saturated polyester resins commercially available. The saturated polyester resin is preferably 30 to 70 parts, more preferably 40 to 60 parts, based on the weight of the polyester resin in the coating composition.
In some preferred examples, the extender pigment includes, but is not limited to, diatomaceous earth, kaolin, aluminum hydroxide, montmorillonite, calcium carbonate, asbestos powder, silica matting powder, mica powder, the wax-like substances include, but are not limited to, carnauba wax, beeswax, lanolin, ozokerite, synthetic wax,
the curing agent in the invention is amino resin which is most commonly used in the field, and the amino resin comprises but is not limited to at least one of melamine formaldehyde resin, methylated urea formaldehyde resin, methylated melamine resin, butylated urea formaldehyde resin, butylated melamine resin and benzoguanamine formaldehyde resin. In a preferred example, the amino resin is preferably one of or a mixture of methylated melamine resin and butylated melamine resin. In contrast, the methylated melamine resin has high flexibility of the cured film, excellent formula stability, and excellent scratch resistance and interlayer adhesion when adopting flexible main body resin. The butyl etherified melamine resin is a high-efficiency cross-linking agent of functional polymers containing hydroxyl, carboxyl and acylamino, has stronger hydrophobicity, higher curing speed when the polymerization degree is higher, and can improve the hardness and higher scratch resistance of a paint film. The amino resin is preferably present in an amount of 1 to 30 parts, more preferably 5 to 20 parts, based on the weight of the amino resin in the coating composition.
In a preferred example, the solvent is at least one selected from cyclohexanone, propylene glycol methyl ether acetate, xylene, butyl acetate, S-100 mineral spirits, trimethylbenzene mineral spirits, and 2-butanone. The weight portion of the solvent in the raw materials of the coating composition is 10 to 40 portions, and more preferably 15 to 30 portions.
The matte finish compositions provided herein also include other components that do not adversely affect the coating composition or the cured coating composition produced therefrom, and are generally used to enhance the coating aesthetics to facilitate manufacture, processing, handling, and application of the composition, and to further improve the specific functionality of the coating composition or the cured coating composition produced therefrom. For example, the compositions of the present invention may optionally include pigments, leveling agents, defoamers, dispersants, catalysts, adhesion promoters, and mixtures thereof as needed to provide desired film properties. Each optional ingredient is preferably included in a sufficient amount to suit its intended purpose, but in an amount that does not adversely affect the coating composition or the cured coating composition resulting therefrom.
As used herein, "pigment" and like terms generally refer to any substance capable of imparting color to a composition; thus, "pigments" and like terms include all colorants, such as pigments, dyes, including but not limited to those used in the paint industry and/or listed in the Dry Color Manufacturers Association (DCMA), and special effect compositions. The colorant may comprise, for example, a finely divided solid powder that is insoluble but wettable under the conditions of use. The colorant may be organic or inorganic and may be agglomerated or non-agglomerated.
Suitable pigments that may be used in accordance with the present invention include, but are not limited to, inorganic metal oxides, organic compounds, metal flakes and mica pigments for "metallic-like" effect colors, extenders, or fillers. Suitable inorganic pigments include titanium dioxide, carbon black, iron oxides, and/or calcined mixed metal oxides. Extender or filler pigments include kaolin clay, talc, calcium carbonate, diatomaceous earth, synthetic calcium silicate, perlite, cellulose fiber, ground silica, calcined clay, microspheres, fumed silica, treated fumed silica, titanium dioxide, wet ground mica, synthetic fibers, snobrite clay, bentonite clay, micronized mica, palygorskite, and/or alumina trihydrate. In addition, exfoliated or non-exfoliated aluminum and mica may be combined with or without other pigments. Any amount of pigment suitable to impart a desired color can be used, and pigments suitable for use with the compositions described herein are known to those skilled in the art and can vary depending on the desired coating color or appearance. If pigments are used, preferably, the pigments are present in the top coat composition in an amount of no more than 40 parts, more preferably no more than 30 parts, and even more preferably no more than 20 parts, based on the total weight of the coating composition.
Examples of dyes include, but are not limited to, those that are solvent-based and/or water-based, such as phthalocyanine (pthalo) green or blue, iron oxide, bismuth vanadate, anthraquinone, perylene, aluminum, and quinacridone. If a dye is used, it is preferably present in the topcoat composition in an amount of no more than 20 parts, more preferably no more than 10 parts, and even more preferably no more than 5 parts, based on the total weight of the coating composition.
The colorant may be in the form of a dispersion, including but not limited to a nanoparticle dispersion. Nanoparticle dispersions can include one or more highly dispersed nanoparticle colorants or colorant particles that produce a desired visible color and/or opacity and/or visual effect. Nanoparticle dispersions can include colorants such as pigments or dyes having particle sizes less than about 150nm, such as less than 70nm, or less than 30 nm. Nanoparticles can be produced by milling a feedstock of organic or inorganic pigments with a grinding media having a particle size of less than 0.5 mm. Nanoparticle dispersions can also be prepared by crystallization, precipitation, vapor phase condensation, and chemical milling (i.e., partial dissolution) methods. To minimize reagglomeration of nanoparticles in the coating, a dispersion of resin-coated nanoparticles may be used. As used herein, "dispersion of resin-coated nanoparticles" refers to a continuous phase having discrete "composite microparticles" dispersed therein, the "composite microparticles" comprising nanoparticles and resin coated on the nanoparticles. If a colorant is used, it is preferably present in the topcoat composition in an amount of no more than 20 parts, more preferably no more than 10 parts, and even more preferably no more than 5 parts.
The other components also comprise an acid catalyst, mainly a blocked acid catalyst, preferably at least one of dinonylnaphthalene disulfonic acid (DNNDSA), dinonylnaphthalene sulfonic acid (DNNSA), dodecylbenzene sulfonic acid (DDBSA), P-toluenesulfonic acid (P-TSA). Preferably, the acid catalyst is present in the topcoat composition in an amount of 0.1 to 2 parts by weight, more preferably 0.5 to 1.5 parts by weight.
The other components also comprise an adhesion promoter which is epoxy, silicon alcohol or phosphate modified polymer, preferably phosphate modified polymer, such as at least one of PAE 206, DS-600, Lubrizol 2063, AKN-6105, Tech-7205, ADP, SN7063 and TZ 8805. Preferably, the adhesion promoter is present in the topcoat composition in an amount of 0.1 to 2 parts, more preferably 0.5 to 1.5 parts.
Dispersants, leveling agents and defoamers may optionally be added to the composition to aid in the flow and wetting of the coating, and the appearance of the coating. Such components suitable for use with the compositions of the present invention are known to those skilled in the art and may vary depending on the desired appearance of the coating. The dispersant is preferably at least one of BYK110, BYK115, BYKP-104 and SOLSPERSE 2000. The leveling agent is a non-silicon system leveling agent, and preferably at least one of BYK-392, BYK-054, BYK-355 and BYK-358N, AFCONA-3773 in Bike chemistry. The defoaming agent is a non-silicon system defoaming agent, and preferably at least one of BYK-352, BYK-354 and AFCONA 2720. If such components are used, the dispersant, leveling agent and defoamer are preferably included in the topcoat composition of the present invention in respective amounts of 0.01 to 10 parts by weight, more preferably 0.1 to 5 parts by weight.
The matte finish composition provided by the present invention can be used to make coatings, the finish composition is typically applied to a primed substrate, and the composition can be applied as a single layer, as a dual layer, or even as multiple layers. Suitable substrates include, but are not limited to, substrates formed from cold rolled steel, polished steel, black skin steel, iron phosphate treated steel, zinc phosphate treated steel, hot galvanized steel, zinc aluminum magnesium alloy, electrogalvanized steel sheet, tin-plated steel sheet, stainless steel, aluminum alloy, brass, and the like.
In some embodiments, the specific process of coating may apply the above-described paint composition as a top coat over the primer to be treated by conventional coating techniques such as roll coating, spray coating, dip coating, and the like. . After the coating composition is applied to the substrate, the composition can be cured using a variety of processes, for example, oven baking by conventional or convective methods, or any other method that provides an elevated temperature suitable for curing the coating. The curing process may be performed in discrete or combined steps. The curing conditions will vary depending on the coating method and the intended end use. The curing process may be carried out at any suitable temperature, including, for example, an oven temperature in the range of about 100 ℃ to 500 ℃, and more preferably about 200 ℃ to 420 ℃. The thickness of the coating film formed by applying the top-coat composition will vary depending on the intended application, but is usually in the range of 10 to 25 μm, preferably 12 to 18 μm, in terms of dry film thickness. The baking process of the finish paint is generally baking in an oven at 300 ℃ for 40-60s, and the baking temperature of a metal plate PMT: 216 ℃ and 249 ℃, preferably PMT 224 ℃ and 241 ℃.
The primer used in conjunction with the matte finish composition provided herein may be a conventional primer coating known in the art, examples including, but not limited to, alkyd polyester primers, saturated polyester primers, polyurethane primers, epoxy primers, and the like, known to those skilled in the art. The thickness of the coating film formed by applying the primer will vary depending on the intended application and type, and the dry film thickness of the primer layer at one coating is usually in the range of 5 to 15 μm, preferably 3 to 8 μm. The baking process of the primer coating is generally baking in an oven at 300 ℃ for 40-60s, and the ratio of the metal plate temperature PMT: 210 ℃ and 249 ℃, preferably PMT 216 ℃ and 224 ℃.
The technical solution of the present invention will be described below with reference to specific embodiments.
Some of the raw materials and their related information used in the following examples are:
polyester resin:
cyster 301 is Nippon's own product, the acid value is 3-5mg KOH/g, the hydroxyl value is 60mg KOH/g, the solid content is 60 wt%, and the molecular weight is 3000-4000;
BCR5006F is Shanghai local product, has an acid value of 3-8mg KOH/g, a hydroxyl value of 34mg KOH/g, a solid content of 60 wt% and a molecular weight of 5000-6000;
60663-R-55 is a product of Taiwan Changxing, has an acid value of 3-8mg KOH/g, a hydroxyl value of 20mg KOH/g, a solid content of 55 wt% and a molecular weight of more than 6000.
Amino resin:
YP5603 is hexamethoxy methyl melamine resin produced by Shanghai Yuanbang;
CYMEL 303 is a hexamethoxymethylmelamine resin produced by Allnex;
CYMEL 325 is a highly new methyl-etherified high imino melamine resin produced by Allnex.
Wax-like substances:
MTE-3019 is AOSEYUN product, and fluorinated polyethylene superfine wax powder with particle size of 5-7 μm.
Silicon dioxide matting powder:
the particle size of the silica matting powder of Tosoh 1011E is 1.5 μm, and the surface is modified by polyethylene wax (which is modified by a treating agent when purchased).
TSA560N silicon dioxide matting powder, particle size 5-6 μm, surface modified by silane coupling agent (having been modified by treating agent when purchased), porosity 2.0 ml/g.
Organic microspheres:
polymethyl (meth) acrylate microspheres (PMMA microspheres) having a particle size of 8 to 13 μm and a true density of 1.19g/cm3。
Poly (methyl) urea-formaldehyde microspheres (PMU microspheres) with particle size of 5-7 μm and true density of 1.47g/cm3。
Example 1
Matte finish compositions were prepared according to the raw materials shown in table 1, specifically:
s1: uniformly mixing part of saturated polyester resin, part of S150 solvent and BYK110, adding titanium dioxide, and grinding to prepare white slurry with the fineness of less than 25 mu m. In the same manner, black paste was prepared with the fineness controlled to be less than 10 μm.
S2: adding aluminum paste into part of S150 solvent in advance, and soaking for several hours at room temperature to ensure that the aluminum powder is fully and uniformly dispersed in the solvent.
S3: the materials of black paste, white paste, pre-foamed aluminum paste, residual saturated polyester resin, amino resin and the like are fully dispersed and uniformly mixed under the stirring state, and then the viscosity of the mixture is adjusted to be 100-140s (measured by a coating-4 cup).
Coating primer to prepare a plate: coating 646 primer produced by Nippon Seisakusho on a 0.5mm pretreated galvanized steel plate by a wire bar roller, baking for 40s in a 300 ℃ oven, and heating a metal plate by PMT: a primer having a film thickness of 7 μm was obtained at 216 ℃.
Finishing paint coating and plate making: the obtained primer composition the obtained top coat was roll-coated on the primer of this example with a wire bar, baked in an oven at 300 ℃ for 40s, sheet metal temperature PMT: 224 ℃ to give a topcoat having a film thickness of 15 μm.
TABLE 1 raw Material ingredient Table of examples and comparative examples
Examples 2, 3, 5 and comparative examples 1 to 4, 6
The raw material compositions of the matte finish compositions of examples 2, 3 and 5 and comparative examples 1 to 4 and 6 are shown in table 1, and the preparation method is similar to that of example 1.
The methods of primer coating and topcoat coating were the same as in example 1.
Example 4 and comparative example 5
The raw material compositions of the matte top-coat compositions in example 4 and comparative example 5 are shown in table 1, and the preparation method is similar to that of example 1, except that the step of S2 is omitted.
The methods of primer coating and topcoat coating were the same as in example 1.
Test example
The paint film formation in examples 1 to 5 and comparative examples 1 to 6 was tested.
Test methods and standards:
unless stated otherwise, the examples and comparative examples in the invention are tested according to the national standard GB/T13448-2006, and the results meet the requirements of the national standard GB/T13448-2006.
Solvent resistant wipe1The test requirements are according to the sample preparation, test environment and test steps specified in GB/T13448-2006 of 10.2. The sample was wiped 100 times (metal aluminum powder and special use 50 times) with an arm force of about 10N (using a manual method) with an index finger wrapped around a cotton gauze and immersed in a butanone solution, and then the portion of the coated surface wiped with an organic solution, butanone (MEK), had no visible color difference and coating breakage compared to the non-wiped portion. The specific test method can refer to the Haier group enterprise standard Q/HR 0502008-
Acid and alkali resistance2The test requires that the sample plate is cut and sealed and soaked in H with the concentration of 5 percent respectively2SO4And NaOH solution is placed at the temperature of 23 +/-2 ℃, taken out after a specified time, and washed by clean water, and the surface of the coating has no bubbles (0 grade) and no obvious change in color. The foaming grade is referred to the national standard GB/T13448-2006. The color difference evaluation method can refer to the requirements of the Haier group enterprise standard Q/HR 0502008-.
The test results are shown in table 2.
Table 2 test results of coating platemaking for the preparation of top coats in examples and comparative examples
From the results in Table 2, it can be found that the paint films formed by the matte finish paint compositions in the embodiments 1 to 5 of the invention not only meet the requirements of the national standard GB/T13448-. The matte finish paint composition provided by the invention has good acid and alkali resistance, high-temperature storage stability and processability while ensuring low gloss.
The finish paint in the comparative example 1 only comprises silicon dioxide matting powder without using organic microspheres, the content of the total matting agent is low, the gloss requirement of matting less than 15 cannot be met, and the alkali resistance is poor; in comparative example 2, the amount of the silica matting powder is increased, and no organic microspheres are used, so that although matting meets the requirements, the alkali resistance and the heat storage stability are deteriorated; in comparative examples 3 and 4, no silica matting powder is used and the type of the organic microspheres is single, so that the sulfuric acid resistance is poor, and when the type of the organic microspheres is not selected properly, the heat storage stability is also poor; in the comparative example 5, only mica powder is used as a flatting agent, and silica flatting powder and organic microspheres are not used, so that the sulfuric acid resistance, the alkali resistance and the heat storage stability of a paint film are poor; the hydroxyl value of the polyester resin used in comparative example 6 does not satisfy the conditions, resulting in deterioration of the solvent wiping resistance. The low gloss and acid and alkali resistance requirements can be met only by the matte finish paint provided by the invention, and when the raw material components are changed, the performance of the finish paint can not meet the requirements.
The test results show that the matte coating composition provided by the invention has good acid and alkali resistance foaming and discoloration resistance, good processability, good rheological property and heat storage stability, and can completely meet the actual requirements of production. In addition, other properties not listed in this table, known to those skilled in the art, may be used to meet the performance requirements.
It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it will be obvious to those skilled in the art that other variations or modifications may be made on the basis of the above description, and all embodiments may not be exhaustive, and all obvious variations or modifications may be included within the scope of the present invention.
Claims (8)
1. The matte finish paint composition is characterized by comprising the following raw materials in parts by weight:
30-70 parts of polyester resin, 1-30 parts of amino resin, 10-40 parts of solvent, 4-20 parts of flatting agent and 10-40 parts of other components;
the flatting agent comprises 2-8 parts of extender pigment, 2-8 parts of organic microspheres and 0-4 parts of wax substances; wherein the extender pigment comprises 2-4 parts of silicon dioxide matting powder;
the acid value of the polyester resin is 0-10mg KOH/g, the hydroxyl value is 60-75mg KOH/g, the solid content is 45-75 wt%, and the molecular weight is 2000-7000;
the particle size of the silicon dioxide matting powder is less than or equal to 15 mu m, the porosity is 0.1-2.2ml/g, and the surface of the silicon dioxide matting powder is modified by a treating agent; the treating agent comprises one or more of silane coupling agent, organic silicon mercaptan, high molecular polyethylene wax and tetrafluoroethylene;
the particle size of the organic microspheres is less than or equal to 15 mu m, and the true density is 1.3-1.8g/cm3(ii) a The weight ratio of the polymethyl (meth) acrylate microspheres, the poly (meth) urea-formaldehyde resin and the polystyrene microspheres in the organic microspheres is 1-3: 1-3: 0-1.
2. The matte finish composition according to claim 1, wherein the treating agent is a high molecular polyethylene wax or a silane coupling agent.
3. The matte finish composition according to claim 1, wherein the extender pigment further comprises at least one of diatomaceous earth, kaolin, aluminum hydroxide, montmorillonite, calcium carbonate, asbestos powder, mica powder; the wax is selected from palm wax, beeswax, lanolin, ceresin, and synthetic wax.
4. The matte finish composition according to claim 1, wherein the amino resin is selected from at least one of melamine formaldehyde resin, methylated urea formaldehyde resin, methylated melamine resin, butylated urea formaldehyde resin, butylated melamine resin, and benzoguanamine formaldehyde resin.
5. The matte finish composition according to claim 1, wherein the amino resin is selected from methylated melamine resin and/or butylated melamine resin.
6. The matte finish composition according to claim 1, wherein the solvent is at least one selected from cyclohexanone, propylene glycol methyl ether acetate, xylene, butyl acetate, S-100 solvent oil, trimethylbenzene solvent oil, and 2-butanone.
7. The matte finish composition according to claim 1, wherein the other components comprise pigments, acid catalysts, adhesion promoters, leveling agents, defoamers, and catalysts.
8. Use of a matte finish composition according to any of claims 1 to 7 for the production of coatings.
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| CN115785890A (en) * | 2022-11-01 | 2023-03-14 | 广州集泰化工股份有限公司 | Matte sealant and preparation method and application thereof |
| CN116102914A (en) * | 2022-12-27 | 2023-05-12 | 贵州正业龙腾新材料开发有限公司 | Environment-friendly water-borne wood coating gloss regulator and preparation method thereof |
| CN116285610B (en) * | 2023-03-02 | 2024-03-15 | 东莞中瀛涂料有限公司 | Low-VOC (volatile organic compound) high-wear-resistance fluff elastic paint and preparation method thereof |
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