CN112409888B - Primer-topcoat waterborne polyurethane high-gloss paint and preparation method thereof - Google Patents
Primer-topcoat waterborne polyurethane high-gloss paint and preparation method thereof Download PDFInfo
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- CN112409888B CN112409888B CN202011260249.8A CN202011260249A CN112409888B CN 112409888 B CN112409888 B CN 112409888B CN 202011260249 A CN202011260249 A CN 202011260249A CN 112409888 B CN112409888 B CN 112409888B
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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
- C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
- C09D163/04—Epoxynovolacs
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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
- C09D5/18—Fireproof paints including high temperature resistant paints
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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
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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
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
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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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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Paints Or Removers (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
The invention belongs to the technical field of coatings. A primer-topcoat waterborne polyurethane high-gloss paint comprises the following components: the modified epoxy resin-polyurethane self-crosslinking emulsion comprises a modified epoxy resin-polyurethane aqueous dispersion, an epoxy modified water-based alkyd resin, a water-based self-crosslinking emulsion, a defoaming agent, a base material wetting agent, a filler, a film-forming assistant, a thickening agent, a dispersing agent and water; the preparation method of the modified epoxy resin-polyurethane aqueous dispersion comprises the following steps: mixing novolac epoxy resin and ethylene glycol monobutyl ether, heating to 150 ℃, stirring for 15-30min at 300-500r/min, introducing nitrogen, cooling to 60-70 ℃, adding methyldiethanolamine, reacting for 2-3h under heat preservation, cooling to room temperature, adding water, aqueous polyurethane emulsion and diacetone alcohol, and stirring uniformly. The high gloss paint disclosed by the invention is high in curing speed, good in film forming performance, good in compactness of a cured paint film, high in glossiness and hardness, and excellent in mechanical property, resistance and chemical resistance.
Description
Technical Field
The invention belongs to the technical field of coatings, and particularly relates to a primer-topcoat waterborne polyurethane high-gloss paint and a preparation method thereof.
Background
According to the functional division, the coating can be divided into a primer and a finish. The primer is used as the first layer of the paint contacting with the substrate, so that the uniform absorption of the finish paint is ensured, the adhesive force of the finish paint can be improved, the fullness of the finish paint is increased, and the alkali resistance and the corrosion resistance of the coating are improved. The finish paint is used for improving the overall effect of the paint, has higher requirements on the used materials, needs to have good chroma and brightness, and further requires a paint film to have good mechanical property, resistance and chemical resistance. The primer and the finish need to be matched for use during coating, so that the construction complexity and the construction cost are increased. The water-based paint has the characteristics of low VOC (volatile organic compounds) emission and high safety, but compared with a solvent-based paint, the water-based paint has the problems of low paint film hardness and poor scratch resistance and wear resistance.
Disclosure of Invention
The invention aims to solve the technical problem of providing a primer-topcoat waterborne polyurethane high-gloss paint which is high in curing speed, good in film forming performance, good in compactness of a cured paint film, high in glossiness and hardness, and excellent in mechanical property, resistance to chemicals and chemical resistance.
The technical scheme of the invention is as follows:
the primer-topcoat waterborne polyurethane high-gloss paint comprises the following components in parts by mass: 15-35 parts of modified epoxy resin-polyurethane aqueous dispersion, 5-12 parts of epoxy modified waterborne alkyd resin, 10-18 parts of waterborne self-crosslinking emulsion, 0.1-1 part of defoaming agent, 0.1-1 part of base material wetting agent, 1-30 parts of filler, 0.1-1 part of film-forming assistant, 0.1-1 part of thickening agent, 0.1-0.5 part of dispersing agent and 5-25 parts of water; the preparation method of the modified epoxy resin-polyurethane aqueous dispersion comprises the following steps: mixing 50-60 parts of novolac epoxy resin and 30-50 parts of ethylene glycol monobutyl ether, heating to 150 ℃, stirring for 15-30min at 300-500r/min, introducing nitrogen, cooling to 60-70 ℃, adding 10-15 parts of methyldiethanolamine, reacting for 2-3h under heat preservation, cooling to room temperature, adding 70-100 parts of water, 8-15 parts of waterborne polyurethane emulsion and 15-30 parts of diacetone alcohol, and stirring for 2-2.5h at 300-500 r/min.
Further, the self-crosslinking emulsion is at least one of organic silicon modified self-crosslinking styrene-acrylic emulsion, polyurethane modified acrylate, epoxy resin modified acrylic emulsion and phosphate ester modified styrene-acrylic emulsion.
Further, the defoaming agent is an aqueous non-silicone fatty acid polymer, polyoxyethylene ether or modified polysiloxane.
Further, the substrate wetting agent is polyether modified polysiloxane.
Further, the filler comprises tungsten carbide, titanium dioxide, spodumene and strontium phosphosilicate in a mass ratio of 1-3.
Further, the film-forming assistant is at least one of polyvinyl alcohol, dipropylene glycol butyl ether and dipropylene glycol methyl ether.
Further, the thickener is an alkali swelling acrylic acid thickener or an associated polyurethane thickener.
Further, the dispersant is an ammonium polycarboxylate dispersant.
The preparation method of the primer-topcoat waterborne polyurethane high-gloss paint comprises the following steps: mixing the filler, the dispersant and water, and grinding the mixture until the fineness of the mixture is less than or equal to 20 mu m to obtain a mixture A; mixing the modified epoxy resin-polyurethane aqueous dispersion, the epoxy modified waterborne alkyd resin and the waterborne self-crosslinking emulsion, stirring for 10-15min at 1000-1300r/min, adding the base material wetting agent, the defoaming agent, the film forming agent and the thickening agent, stirring for 10-15min at 800-1000r/min, adding the mixture A, and uniformly stirring.
The invention has the following beneficial effects:
the modified epoxy resin-polyurethane aqueous dispersion selected by the invention can improve the hydrophilicity of the epoxy resin and simultaneously reserve a considerable amount of epoxy groups in the molecular structure, and the aqueous dispersion formed by modification has excellent dispersion stability and simultaneously has good acid and alkali resistance, heat resistance, electrolyte resistance and wear resistance of the epoxy resin. The selected epoxy modified waterborne alkyd resin has good dispersibility, and can effectively improve the yellowing resistance, chemical resistance and mechanical properties of a paint film. The selected water-based self-crosslinking emulsion can improve the curing speed and film-forming property of the coating and improve the adhesive force, flexibility and water resistance of a paint film. The three components are matched to be used as film forming substances, the crosslinking density of a paint film is high, the hardness and the glossiness of the paint film are effectively improved, and the paint film is endowed with excellent mechanical property, scratch resistance, wear resistance and chemical resistance.
Detailed Description
The present invention will be described in detail with reference to examples, which are only preferred embodiments of the present invention and are not intended to limit the present invention.
Examples
The following table shows the formulation of 3 examples of the primer-topcoat waterborne polyurethane paint of the present invention (unit: part).
The preparation method of the modified epoxy resin-polyurethane aqueous dispersion comprises the following steps: mixing 50 parts of novolac epoxy resin and 30 parts of ethylene glycol monobutyl ether, heating to 150 ℃, stirring for 15min at 300r/min, introducing nitrogen, cooling to 60 ℃, adding 10 parts of methyldiethanolamine, reacting for 2h under heat preservation, cooling to room temperature, adding 70 parts of water, 8 parts of waterborne polyurethane emulsion and 15 parts of diacetone alcohol, and stirring for 2h at 300 r/min.
The filler comprises tungsten carbide, titanium dioxide, spodumene and strontium phosphosilicate in a mass ratio of 1.
The preparation method of the primer-topcoat waterborne polyurethane high-gloss paint comprises the following steps: mixing the filler, the dispersant and water, and grinding the mixture until the fineness is less than or equal to 20 mu m to obtain a mixture A; mixing the modified epoxy resin-polyurethane aqueous dispersion, the epoxy modified waterborne alkyd resin and the waterborne self-crosslinking emulsion, stirring at 1100r/min for 15min, adding the base material wetting agent, the defoaming agent, the film forming agent and the thickening agent, stirring at 800r/min for 10min, adding the mixture A, and stirring uniformly.
Comparative example 1
Comparative example 1 differs from example 1 in that: the modified epoxy resin-polyurethane aqueous dispersion is replaced by an aqueous polyurethane dispersion.
Comparative example 2
Comparative example 2 differs from example 2 in that: replacing the epoxy modified waterborne alkyd resin with a waterborne alkyd resin.
Comparative example 3
Comparative example 3 differs from example 3 in that: the waterborne self-crosslinking emulsion is replaced by 6 parts of epoxy modified waterborne alkyd resin and 12 parts of modified epoxy resin-polyurethane aqueous dispersion.
Comparative example 4
Comparative example 4 differs from example 1 in that: the filler is titanium dioxide.
3 examples and 4 comparative examples of the primer-topcoat waterborne polyurethane high-gloss paint are taken as samples, an equal amount of the samples are sprayed on a low-carbon steel plate with the surface subjected to oil removal and polishing treatment, and the performances of the low-carbon steel plate are tested after the low-carbon steel plate is placed at room temperature for 7 days, wherein the test results are shown in the following table:
therefore, the high gloss paint disclosed by the invention is good in glossiness and high in hardness, and has good impact resistance, wear resistance, water resistance, alkali resistance, oil resistance, aging resistance and neutral salt spray resistance.
The high gloss paint disclosed by the invention is high in curing speed, good in film forming performance, good in compactness of a cured paint film, high in glossiness and hardness, and excellent in mechanical property, resistance and chemical resistance.
Claims (8)
1. The primer-topcoat waterborne polyurethane high-gloss paint is characterized by comprising the following components in parts by mass: 15-35 parts of modified epoxy resin-polyurethane aqueous dispersion, 5-12 parts of epoxy modified waterborne alkyd resin, 10-18 parts of waterborne self-crosslinking emulsion, 0.1-1 part of defoaming agent, 0.1-1 part of base material wetting agent, 1-30 parts of filler, 0.1-1 part of film-forming assistant, 0.1-1 part of thickening agent, 0.1-0.5 part of dispersing agent and 5-25 parts of water; the preparation method of the modified epoxy resin-polyurethane aqueous dispersion comprises the following steps: mixing 50-60 parts of novolac epoxy resin and 30-50 parts of ethylene glycol monobutyl ether, heating to 150 ℃, stirring for 15-30min at 300-500r/min, introducing nitrogen, cooling to 60-70 ℃, adding 10-15 parts of methyldiethanolamine, reacting for 2-3h at a constant temperature, cooling to room temperature, adding 70-100 parts of water, 8-15 parts of waterborne polyurethane emulsion and 15-30 parts of diacetone alcohol, and stirring for 2-2.5h at 300-500 r/min; the self-crosslinking emulsion is one of organosilicon modified self-crosslinking styrene-acrylic emulsion, polyurethane modified acrylate and phosphate modified styrene-acrylic emulsion.
2. The primer-topcoat waterborne polyurethane paint as claimed in claim 1, wherein the defoamer is an aqueous non-silicone fatty acid polymer, polyoxyethylene ether or modified polysiloxane.
3. The primer-topcoat waterborne polyurethane paint of claim 1, wherein the substrate wetting agent is polyether modified polysiloxane.
4. The primer-topcoat waterborne polyurethane high-gloss paint of claim 1, wherein the filler comprises tungsten carbide, titanium dioxide, spodumene and strontium phosphosilicate in a mass ratio of 1-3.
5. The primer-topcoat waterborne polyurethane high-gloss paint of claim 1, wherein the film-forming assistant is at least one of polyvinyl alcohol, dipropylene glycol butyl ether and dipropylene glycol methyl ether.
6. The primer-topcoat waterborne polyurethane paint of claim 1, wherein the thickener is an alkali-swellable acrylic thickener or an associative polyurethane thickener.
7. The primer-topcoat waterborne polyurethane paint of claim 1, wherein the dispersant is an ammonium polycarboxylate dispersant.
8. The preparation method of the primer-topcoat waterborne polyurethane paint as described in any one of claims 1 to 7, which comprises the following steps: mixing the filler, the dispersant and water, and grinding the mixture until the fineness of the mixture is less than or equal to 20 mu m to obtain a mixture A; mixing the modified epoxy resin-polyurethane aqueous dispersion, the epoxy modified waterborne alkyd resin and the waterborne self-crosslinking emulsion, stirring for 10-15min at 1000-1300r/min, adding the base material wetting agent, the defoaming agent, the film forming agent and the thickening agent, stirring for 10-15min at 800-1000r/min, adding the mixture A, and stirring uniformly.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011260249.8A CN112409888B (en) | 2020-11-12 | 2020-11-12 | Primer-topcoat waterborne polyurethane high-gloss paint and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011260249.8A CN112409888B (en) | 2020-11-12 | 2020-11-12 | Primer-topcoat waterborne polyurethane high-gloss paint and preparation method thereof |
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| CN112409888A CN112409888A (en) | 2021-02-26 |
| CN112409888B true CN112409888B (en) | 2022-10-11 |
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| CN113185905A (en) * | 2021-05-13 | 2021-07-30 | 浙江光辉文教用品有限公司 | Environment-friendly water-based drawing paint for pencils and preparation method thereof |
| CN113185907A (en) * | 2021-05-24 | 2021-07-30 | 浙江光辉文教用品有限公司 | Environment-friendly water-based dipping head paint for pencils and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101270221B (en) * | 2008-04-30 | 2011-05-11 | 武汉理工大学 | Method for preparing composite emulsion of epoxy resin-polyurethane |
| CN101838389A (en) * | 2010-01-19 | 2010-09-22 | 武汉力诺化学集团有限公司 | Epoxy modified water-based alkyd resin and preparation method thereof |
| CN104356884B (en) * | 2014-10-10 | 2016-12-07 | 广州擎天材料科技有限公司 | A kind of for the low-temperature quick-drying type aqueous bottom surface of elevator rail unification protective paint and preparation method thereof |
| CN107163502B (en) * | 2017-05-08 | 2019-02-05 | 惠州市惠阳区嘉泰涂料有限公司 | A kind of highly corrosion resistant epoxy resin water dispersion and preparation method thereof |
| CN107619637A (en) * | 2017-10-09 | 2018-01-23 | 何玉珍 | A kind of compound resin aqueous dispersion and preparation method thereof |
| CN111286259A (en) * | 2020-04-07 | 2020-06-16 | 沈阳市金海韵涂料有限公司 | Environment-friendly water-based steel structure antirust primer-topcoat paint |
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