CN111704836A - Low-temperature baking water paint and production process thereof - Google Patents
Low-temperature baking water paint and production process thereof Download PDFInfo
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Abstract
The low-temperature baking water paint comprises the following raw materials in percentage by weight: 50-60% of water-based acrylic resin, 5-10% of amino resin, 1-5% of glycidyl ether, 15-20% of powder filler, 1-2% of triethanolamine, 0.05-0.1% of defoaming agent, 0.2-0.5% of wetting agent, 0.2-0.3% of dispersing agent, 0.1-0.5% of thickening agent and 5-25% of deionized water. The glycidyl ether is glycerol tri (1, 2-epoxy) propyl ether, the powder filler is one or more of heavy calcium carbonate, wollastonite powder, precipitated barium sulfate, mica iron oxide and titanium dioxide, the defoaming agent is an organic silicon defoaming agent, the wetting agent is polyether modified polysiloxane, the dispersing agent is low molecular weight sodium polyacrylate, and the thickening agent is a polyvinyl alcohol dilute solution. The production process comprises four steps of high-speed dispersion, dispersion grinding, stirring and paint mixing, filtering and packaging.
Description
Technical Field
The invention relates to the field of paint production, in particular to low-temperature baking water paint and a production process thereof.
Background
The amino baking varnish takes acrylic resin or alkyd resin with hydroxyl and amino resin as main film forming substances, and the amino baking varnish undergoes chemical reaction at the temperature of over 140 ℃, and is dried and cured. Amino stoving enamels have many advantages, for example: the paint film has excellent performance and short maintenance time, can be packaged and delivered after being baked and cooled, has the advantages of high hardness, excellent adhesive force, high gloss, good gloss and color retention and the like after being cured, and is widely applied to the coating of products requiring extremely high decorative effect requirements or high corrosion resistance. However, in the prior art, the amino baking varnish can be completely cured only by baking for more than 30-40 minutes at the temperature of more than 140 ℃, on one hand, high-temperature baking consumes a large amount of energy, and on the other hand, the longer baking time can reduce the coating efficiency and increase the labor cost. In addition, the solvent-based amino baking varnish emits a large amount of Volatile Organic Compounds (VOC). Therefore, the development of the water-based acrylic amino baking paint which can be rapidly cured at low-temperature baking is required to meet the requirements of environmental protection and energy conservation.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a low-temperature baking water paint and a production process thereof.
The technical scheme for realizing the purpose of the invention is as follows: the low-temperature baking water paint comprises the following raw materials in percentage by weight: 50-60% of water-based acrylic resin, 5-10% of amino resin, 1-5% of glycidyl ether, 15-20% of powder filler, 1-2% of triethanolamine, 0.05-0.1% of defoaming agent, 0.2-0.5% of wetting agent, 0.2-0.3% of dispersing agent, 0.1-0.5% of thickening agent and 5-25% of deionized water.
The glycidyl ether is glycerol tri (1, 2-epoxy) propyl ether, and the chemical structural formula is as follows:
the powder filler is one or more of heavy calcium, wollastonite powder, precipitated barium sulfate, mica iron oxide and titanium dioxide.
The defoaming agent is an organic silicon defoaming agent.
The wetting agent is polyether modified polysiloxane.
The dispersing agent is low molecular weight sodium polyacrylate.
The thickening agent is polyvinyl alcohol dilute solution.
The invention also provides a production process of the low-temperature baking water paint, which comprises the following steps:
(1) and (4) dispersing at high speed. Putting deionized water, water-based acrylic resin, a dispersing agent, a defoaming agent and a wetting agent into a reaction kettle, and stirring at a stirring speed of 1500-2000 rpm for 10-20 minutes to form a uniform dispersion liquid.
(2) And (5) dispersing and grinding. Adding powder filler into the dispersion, and grinding at a high speed for 20-40 minutes at a stirring speed of 2000-2500 rpm to prepare uniform slurry.
(3) Stirring and mixing the paint. Adding amino resin, glycidyl ether and triethanolamine into the slurry, and uniformly stirring; finally, adding the thickening agent and uniformly stirring;
(4) and (6) filtering and packaging.
The technical principle of the invention is as follows: glycidyl ethers, i.e., glycerol tri (1, 2-epoxy) propyl ether, have the following chemical formula:
one glycidyl ether molecule contains 3 epoxy functional groups, and under the catalysis of triethanolamine, hydroxyl in acrylic resin molecules and amino in amino resin molecules can both perform crosslinking reaction with the epoxy functional groups at different positions in the glycidyl ether molecules at a lower temperature (80-100 ℃), so that the resin is cured into a film, namely the acrylic resin and the amino resin are indirectly connected and form a network structure through the crosslinking action of the glycidyl ether, and the resin is cured into a film to obtain a perfect paint film.
The invention has the following beneficial effects:
(1) the invention can reduce the baking temperature of the waterborne acrylic amino baking varnish, can be completely cured after being baked for 30-60 minutes at 80-100 ℃, and has low production energy consumption and high efficiency.
(2) The low-temperature baking water paint is water-based paint, has low VOC emission, environmental protection and low odor, can be widely applied to the surfaces of steel, aluminum parts, plastics and the like, and has better decorative effect and higher corrosion resistance.
Drawings
FIG. 1 is a process flow diagram of the present invention.
FIG. 2 is a chemical structural formula of glycidyl ether.
Detailed Description
The invention will be described in further detail below with reference to specific embodiments and the accompanying fig. 1 and 2, but the scope of the invention is not limited to the following.
The low-temperature baking water paint comprises the following raw materials in percentage by weight: 50-60% of water-based acrylic resin, 5-10% of amino resin, 1-5% of glycidyl ether, 15-20% of powder filler, 1-2% of triethanolamine, 0.05-0.1% of defoaming agent, 0.2-0.5% of wetting agent, 0.2-0.3% of dispersing agent, 0.1-0.5% of thickening agent and 5-25% of deionized water.
The glycidyl ether is glycerol tri (1, 2-epoxy) propyl ether, and the chemical structural formula is as follows:
the powder filler is one or more of heavy calcium, wollastonite powder, precipitated barium sulfate, mica iron oxide and titanium dioxide.
The defoaming agent is an organic silicon defoaming agent.
The wetting agent is polyether modified polysiloxane.
The dispersing agent is low molecular weight sodium polyacrylate.
The thickening agent is polyvinyl alcohol dilute solution.
The invention also provides a production process of the low-temperature baking water paint, which comprises the following steps:
(1) and (4) dispersing at high speed. Putting deionized water, water-based acrylic resin, a dispersing agent, a defoaming agent and a wetting agent into a reaction kettle, and stirring at a stirring speed of 1500-2000 rpm for 10-20 minutes to form a uniform dispersion liquid.
(2) And (5) dispersing and grinding. Adding powder filler into the dispersion, and grinding at a high speed for 20-40 minutes at a stirring speed of 2000-2500 rpm to prepare uniform slurry.
(3) Stirring and mixing the paint. Adding amino resin, glycidyl ether and triethanolamine into the slurry, and uniformly stirring; finally, adding the thickening agent and uniformly stirring;
(4) and (6) filtering and packaging.
Example 1:
the low-temperature baking water paint comprises the following raw materials in percentage by weight: 55% of water-based acrylic resin, 7.5% of amino resin, 3% of glycidyl ether, 17.5% of powder filler, 1.5% of triethanolamine, 0.075% of defoaming agent, 0.35% of wetting agent, 0.25% of dispersing agent, 0.3% of thickening agent and 14.525% of deionized water.
The glycidyl ether is glycerol tri (1, 2-epoxy) propyl ether, and the chemical structural formula is as follows:
the powder filler is heavy calcium carbonate, precipitated barium sulfate and mica iron oxide.
The defoaming agent is an organic silicon defoaming agent.
The wetting agent is polyether modified polysiloxane.
The dispersing agent is low molecular weight sodium polyacrylate.
The thickening agent is polyvinyl alcohol dilute solution.
The invention also provides a production process of the low-temperature baking water paint, which comprises the following steps:
(1) and (4) dispersing at high speed. Deionized water, water-based acrylic resin, a dispersing agent, a defoaming agent and a wetting agent are put into a reaction kettle and stirred for 15 minutes at a stirring speed of 1750 revolutions per minute to form uniform dispersion liquid.
(2) And (5) dispersing and grinding. Adding powder filler into the dispersion, and grinding at a high speed of 2250 rpm for 30 minutes to obtain uniform slurry.
(3) Stirring and mixing the paint. Adding amino resin, glycidyl ether and triethanolamine into the slurry, and uniformly stirring; finally, adding the thickening agent and uniformly stirring;
(4) and (6) filtering and packaging.
The performance of the paint is as follows: spraying the prepared water paint on a standard iron plate, leveling for 5min, baking for 45min in a 90 ℃ oven, carrying out performance detection on the paint film, and testing the salt spray resistance, the water resistance, the salt water resistance and the solvent wiping resistance (the thickness of the paint film is 35 +/-5 mu m). Solvent-resistant wiping: and fully dipping butanone with a cotton ball, wiping the sample plate back and forth with 1Kg of force, and observing whether the surface of the paint film is exposed. The results of the measurements are shown in the following table:
| detecting items | The result of the detection | |
| Paint film appearance | Smooth and flat surface without stickiness | |
| Adhesion (cross-hatch method)/ | Level | 0 |
| Gloss (60 degree) | 96 | |
| Hardness of pencil | 4H | |
| Flexibility/mm | 1 | |
| Impact resistance/cm | 60 | |
| Resistance to salt fog | 608h, no bubbling, no rusting and no falling | |
| Water resistance | 900h，Does not foam or fall off | |
| Brine tolerance (3% NaCl) | No bubbling and rust for 500h | |
| Solvent resistant wipe | 320 times without exposing bottom |
Example 2:
the low-temperature baking water paint comprises the following raw materials in percentage by weight: 50% of water-based acrylic resin, 5% of amino resin, 1% of glycidyl ether, 20% of powder filler, 1% of triethanolamine, 0.05% of defoaming agent, 0.2% of wetting agent, 0.3% of dispersing agent, 0.1% of thickening agent and 22.35% of deionized water.
The glycidyl ether is glycerol tri (1, 2-epoxy) propyl ether, and the chemical structural formula is as follows:
the powder filler is heavy calcium carbonate, wollastonite powder and mica iron oxide.
The defoaming agent is an organic silicon defoaming agent.
The wetting agent is polyether modified polysiloxane.
The dispersing agent is low molecular weight sodium polyacrylate.
The thickening agent is polyvinyl alcohol dilute solution.
The invention also provides a production process of the low-temperature baking water paint, which comprises the following steps:
(1) and (4) dispersing at high speed. Deionized water, water-based acrylic resin, a dispersing agent, a defoaming agent and a wetting agent are put into a reaction kettle and stirred for 20 minutes at a stirring speed of 1500 rpm to form uniform dispersion liquid.
(2) And (5) dispersing and grinding. The powder filler was added to the dispersion and ground at a high speed of 2000 rpm for 40 minutes to produce a uniform slurry.
(3) Stirring and mixing the paint. Adding amino resin, glycidyl ether and triethanolamine into the slurry, and uniformly stirring; finally, adding the thickening agent and uniformly stirring;
(4) and (6) filtering and packaging.
The performance of the paint is as follows: spraying the prepared water paint on a standard iron plate, leveling for 5min, baking for 30min in a 100 ℃ oven, carrying out performance detection on the paint film, and testing the salt spray resistance, the water resistance, the salt water resistance and the solvent wiping resistance (the thickness of the paint film is 35 +/-5 mu m). Solvent-resistant wiping: and fully dipping butanone with a cotton ball, wiping the sample plate back and forth with 1Kg of force, and observing whether the surface of the paint film is exposed. The results of the measurements are shown in the following table:
example 3:
the low-temperature baking water paint comprises the following raw materials in percentage by weight: 60% of water-based acrylic resin, 10% of amino resin, 5% of glycidyl ether, 15% of powder filler, 2% of triethanolamine, 0.1% of defoaming agent, 0.5% of wetting agent, 0.3% of dispersing agent, 0.5% of thickening agent and 7.05% of deionized water.
The glycidyl ether is glycerol tri (1, 2-epoxy) propyl ether, and the chemical structural formula is as follows:
the powder filler is wollastonite powder, precipitated barium sulfate, mica iron oxide and titanium dioxide.
The defoaming agent is an organic silicon defoaming agent.
The wetting agent is polyether modified polysiloxane.
The dispersing agent is low molecular weight sodium polyacrylate.
The thickening agent is polyvinyl alcohol dilute solution.
The invention also provides a production process of the low-temperature baking water paint, which comprises the following steps:
(1) and (4) dispersing at high speed. Deionized water, water-based acrylic resin, a dispersing agent, a defoaming agent and a wetting agent are put into a reaction kettle and stirred for 10 minutes at a stirring speed of 2000 rpm to form uniform dispersion liquid.
(2) And (5) dispersing and grinding. Adding powder filler into the dispersion, and grinding at a high speed of 2500 rpm for 20 minutes to prepare uniform slurry.
(3) Stirring and mixing the paint. Adding amino resin, glycidyl ether and triethanolamine into the slurry, and uniformly stirring; finally, adding the thickening agent and uniformly stirring;
(4) and (6) filtering and packaging.
The performance of the paint is as follows: spraying the prepared water paint on a standard iron plate, leveling for 5min, putting the water paint into an oven at 80 ℃, baking for 60min, carrying out performance detection on the paint film, and testing the salt spray resistance, the water resistance, the salt water resistance and the solvent wiping resistance (the thickness of the paint film is 35 +/-5 mu m). Solvent-resistant wiping: and fully dipping butanone with a cotton ball, wiping the sample plate back and forth with 1Kg of force, and observing whether the surface of the paint film is exposed. The results of the measurements are shown in the following table:
| detecting items | The result of the detection | |
| Paint film appearance | Smooth and flat surface without stickiness | |
| Adhesion (cross-hatch method)/ | Level | 0 |
| Gloss (60 degree)) | 97 | |
| Hardness of pencil | 4H | |
| Flexibility/mm | 1 | |
| Impact resistance/cm | 55 | |
| Resistance to salt fog | No bubbling, no rusting and no falling after 600h | |
| Water resistance | No bubbling and no falling after 1000h | |
| Brine tolerance (3% NaCl) | No bubbling and rust after 600h | |
| Solvent resistant wipe | 360 times without exposing the bottom |
The low-temperature baking water paint can be used on the surfaces of steel, aluminum, plastics and the like, the thickness of different materials and materials also has an influence on the baking time of the water paint, the data mentioned in the above examples 1-3 are theoretical data tested by a laboratory on a steel plate with the thickness of 150mm multiplied by 70mm multiplied by (0.8mm-1.0mm), and the conclusion obtained according to the actual situation at the construction site is basically consistent with the situation of the laboratory.
In conclusion, the low-temperature baking water paint of the invention can be completely cured after being baked for 30-60 minutes at 80-100 ℃, the gloss of the paint film is as high as more than 95, the construction energy consumption is low, and the efficiency is high. In addition, the low-temperature baking water paint has low VOC emission, environmental protection and low odor, and can be widely applied to the surfaces of steel, aluminum, plastics and the like.
The above-mentioned embodiments are only for describing the preferred mode of the present invention, and do not limit the scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art without departing from the design solution of the present invention should fall within the protection scope defined by the claims of the present invention.
Claims (8)
1. The low-temperature baking water paint is characterized by comprising the following raw materials in percentage by weight: 50-60% of water-based acrylic resin, 5-10% of amino resin, 1-5% of glycidyl ether, 15-20% of powder filler, 1-2% of triethanolamine, 0.05-0.1% of defoaming agent, 0.2-0.5% of wetting agent, 0.2-0.3% of dispersing agent, 0.1-0.5% of thickening agent and 5-25% of deionized water.
2. The low-temperature baking water paint according to claim 1, wherein the glycidyl ether is glycerol tri (1, 2-epoxy) propyl ether.
3. The low-temperature baking water paint as claimed in claim 1, wherein the powder filler is one or more of heavy calcium carbonate, wollastonite powder, precipitated barium sulfate, mica iron oxide and titanium dioxide.
4. The low-temperature baking water paint as claimed in claim 1, wherein the defoaming agent is a silicone defoaming agent.
5. The low-temperature baking water paint as claimed in claim 1, wherein the wetting agent is polyether modified polysiloxane.
6. The low-temperature baking water paint as claimed in claim 1, wherein the dispersant is low molecular weight sodium polyacrylate.
7. The low-temperature baking water paint according to claim 1, wherein the thickener is a polyvinyl alcohol dilute solution.
8. A process for producing a low-baking water paint according to claim 1, comprising the steps of: (1) high-speed dispersion: putting deionized water, water-based acrylic resin, a dispersing agent, a defoaming agent and a wetting agent into a reaction kettle, and stirring at a stirring speed of 1500-2000 rpm for 10-20 minutes to form uniform dispersion liquid; (2) dispersing and grinding: adding powder filler into the dispersion liquid, and grinding at a high speed for 20-40 minutes at a stirring speed of 2000-2500 rpm to prepare uniform slurry; (3) stirring and paint mixing: adding amino resin, glycidyl ether and triethanolamine into the slurry, and uniformly stirring; finally, adding the thickening agent and uniformly stirring; (4) and (6) filtering and packaging.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113088144A (en) * | 2021-03-05 | 2021-07-09 | 广东呈美化学材料有限公司 | Low-temperature curing water-based amino baking varnish coating applied to metal and preparation method thereof |
| CN116463019A (en) * | 2023-05-16 | 2023-07-21 | 天津国隆材料科技有限公司 | Quick-drying butanone-resistant waterborne acrylic amino baking varnish and preparation method thereof |
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