CN113512342A - Anti-doodling powder coating and preparation method thereof - Google Patents
Anti-doodling powder coating and preparation method thereof Download PDFInfo
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- CN113512342A CN113512342A CN202110655137.0A CN202110655137A CN113512342A CN 113512342 A CN113512342 A CN 113512342A CN 202110655137 A CN202110655137 A CN 202110655137A CN 113512342 A CN113512342 A CN 113512342A
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- raw materials
- powder coating
- graffiti
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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
- C09D5/03—Powdery paints
- C09D5/033—Powdery paints characterised by the additives
-
- 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
- C08K3/30—Sulfur-, selenium- or tellurium-containing compounds
- C08K2003/3045—Sulfates
Abstract
The invention discloses an anti-doodling powder coating which comprises the following raw materials in percentage by mass: 40-50% of bifunctional polyester; 10-14% of a curing agent; 0.5-1% of a leveling agent; 0.3-0.5% of benzoin; 0.5-1% of surface active auxiliary agent; 20-40% of barium sulfate; 1-20% of pigment. The paint has low compatibility with oily substances such as oil stains or printing ink, and when the paint layer is polluted by graffiti and oil stains, the pollution can be easily cleaned without leaving stains. The barium sulfate and the curing agent in the formula can reinforce the mechanical property of the coating, improve the mechanical property of the coating and reduce damage. The surface active auxiliary agent can improve the compatibility among the formulas, so that the components can be uniformly mixed in the melt extrusion process.
Description
Technical Field
The invention relates to the field of coatings, in particular to an anti-doodling powder coating and a preparation method thereof.
Background
The traditional paint has the defects of large pollution, pungent smell, influence on human health and the like, and along with the increasingly strong concept of environmental protection, the process of replacing the traditional paint with the thermosetting powder coating is also more and more widely applied. Compared with the traditional paint, the thermosetting powder coating has the advantages of environmental protection, safety, no peculiar smell and the like. The powder coating is increasingly widely applied to spraying of metal curtain wall doors and windows, furniture, household appliances, electromechanical shells and the like. The exposed decorative surface coating is often polluted by external graffiti and oil stain, so that the appearance aesthetic feeling is poor, and the common powder coating is difficult to clean after being sprayed and cured, has poor graffiti resistance effect and is difficult to restore the original appearance.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide the doodling-resistant powder coating which is easy to clean and has no influence on the appearance of a coating layer after cleaning and the preparation method thereof.
In order to achieve the above purpose, the plan scheme adopted by the invention is as follows: the anti-doodling powder coating comprises the following raw materials in percentage by mass: 40-50% of bifunctional polyester; 10-14% of a curing agent; 0.5-1% of a leveling agent; 0.3-0.5% of benzoin; 0.5-1% of surface active auxiliary agent; 20-40% of barium sulfate; 1-20% of pigment.
Preferably, the curing agent comprises tris (2, 3-epoxypropyl) isocyanate and isophorone diisocyanate, wherein the curing agent comprises tris (2, 3-epoxypropyl) isocyanate accounting for 3-4% of the total mass of the raw materials, and isophorone diisocyanate accounting for 7-10% of the total mass of the raw materials.
Preferably, the leveling agent is a polypropylene ester.
Preferably, the bifunctional polyester has a terminal carboxyl group and a terminal hydroxyl group, the hydroxyl value of the bifunctional polyester is 10-50 mgKOH/g, the acid value is 15-50 mgKOH/g, and the viscosity at 200 ℃ is 2500-5500 mPas.
The invention also provides a preparation method of the anti-doodling powder coating, which comprises the following steps:
s1, weighing the raw materials in proportion and stirring the raw materials until the raw materials are uniformly mixed;
s2, feeding the weighed raw materials into a double-screw extruder for melt extrusion, cooling and tabletting to obtain a flaky blank;
and S3, crushing the blank into powder to obtain a finished product.
Preferably, in the step S1, the weighed raw materials are mixed in a premix tank for 1 to 3 minutes.
Preferably, in the step S2, the screw rotation speed of the twin-screw extruder is 40-50 Hz, the temperature in zone 1 is 100-110 ℃, and the temperature in zone 2 is 105-115 ℃.
Preferably, in the step S3, the powder is sieved by a 180-mesh sieve, and the median particle size of the finished product is 25 to 35 μm.
The invention has the beneficial effects that: the main component of the anti-graffiti powder coating is bifunctional polyester which has hydrophilic carboxyl end groups and hydroxyl end groups, so that the anti-graffiti powder coating has low compatibility with oily substances such as oil stains or printing ink, and when the coating is polluted by graffiti and oil stains, the pollution can be easily cleaned without leaving stains. The barium sulfate and the curing agent in the formula can reinforce the mechanical property of the coating, improve the mechanical property of the coating and reduce damage. The surface active assistant can improve the compatibility among the formulas, and substances generated in the medium melting and curing reaction of the components are fully dissolved and orderly arranged, so that a compact, smooth and firm coating with a compact, smooth and firm surface can be formed, and the pollution of graffiti and oil stain can be resisted.
Detailed Description
The technical solution adopted by the present invention will now be described in further detail with reference to various embodiments.
Example one
The anti-doodling powder coating in the embodiment comprises the following raw materials in percentage by mass:
| raw materials | Content (W%) | Manufacturer and model |
| Difunctional polyesters | 40 | TI3905, Guangzhou Optimus |
| Curing agent (tris (2, 3-epoxypropyl) isocyanate) | 3 | / |
| Curing agent (isophorone diisocyanate) | 7 | / |
| Flatting agent (Polypropylene ester) | 0.5 | / |
| Benzoinum | 0.3 | / |
| Surface active agent | 0.5 | LD-17, Jietongda |
| Barium sulfate | 40 | / |
| Pigment (I) | 8.7 | / |
The bifunctional polyester has a terminal carboxyl group and a terminal hydroxyl group, the hydroxyl value of the bifunctional polyester is 10-50 mgKOH/g, the acid value is 15-50 mgKOH/g, and the viscosity at 200 ℃ is 2500-5500 mPa & s. In this embodiment, the polyester model No. TI3905, produced by canthus, guangzhou, is used, and in other embodiments, other difunctional polyesters may be selected based on the above parameters.
The preparation method of the anti-graffiti powder coating in the embodiment comprises the following steps:
s1, weighing the raw materials in proportion, and mixing the weighed raw materials in a premix tank for 1-3 minutes so as to stir until the raw materials are uniformly mixed.
S2, feeding the weighed raw materials into a double-screw extruder for melt extrusion, wherein the screw rotating speed of the double-screw extruder is 40-50 Hz, the temperature of the 1 zone is 100-110 ℃, and the temperature of the 2 zone is 105-115 ℃. And cooling and tabletting the extruded molten material to obtain a flaky blank.
S3, crushing the blank into powder, and screening the powder by using a 180-mesh screen to obtain a finished product, wherein the median particle size of the finished product is 25-35 mu m.
Example two
The anti-doodling powder coating in the embodiment comprises the following raw materials in percentage by mass:
| raw materials | Content (W%) | Manufacturer and model |
| Difunctional polyesters | 50 | TI3905, Guangzhou Optimus |
| Curing agent (tris (2, 3-epoxypropyl) isocyanate) | 4 | / |
| Curing agent (isophorone diisocyanate) | 10 | / |
| Flatting agent (Polypropylene)Esters) | 1 | / |
| Benzoinum | 0.5 | / |
| Surface active agent | 1 | LD-17, Jietongda |
| Barium sulfate | 20 | / |
| Pigment (I) | 13.5 | / |
The bifunctional polyester has a terminal carboxyl group and a terminal hydroxyl group, the hydroxyl value of the bifunctional polyester is 10-50 mgKOH/g, the acid value is 15-50 mgKOH/g, and the viscosity at 200 ℃ is 2500-5500 mPa & s. In this embodiment, the polyester model No. TI3905, produced by canthus, guangzhou, is used, and in other embodiments, other difunctional polyesters may be selected based on the above parameters.
The preparation method of the anti-graffiti powder coating in the embodiment comprises the following steps:
s1, weighing the raw materials in proportion, and mixing the weighed raw materials in a premix tank for 1-3 minutes so as to stir until the raw materials are uniformly mixed.
S2, feeding the weighed raw materials into a double-screw extruder for melt extrusion, wherein the screw rotating speed of the double-screw extruder is 40-50 Hz, the temperature of the 1 zone is 100-110 ℃, and the temperature of the 2 zone is 105-115 ℃. And cooling and tabletting the extruded molten material to obtain a flaky blank.
S3, crushing the blank into powder, and screening the powder by using a 180-mesh screen to obtain a finished product, wherein the median particle size of the finished product is 25-35 mu m.
EXAMPLE III
The anti-doodling powder coating in the embodiment comprises the following raw materials in percentage by mass:
| raw materials | Content (W%) | Manufacturer and model |
| Difunctional polyesters | 46 | TI3905, Guangzhou Optimus |
| Curing agent (tris (2, 3-epoxypropyl) isocyanate) | 3.5 | / |
| Curing agent (isophorone diisocyanate) | 8 | / |
| Flatting agent (Polypropylene ester) | 0.8 | / |
| Benzoinum | 0.5 | / |
| Surface active agent | 1 | LD-17, Jietongda |
| Barium sulfate | 21 | / |
| Pigment (I) | 20 | / |
The bifunctional polyester has a terminal carboxyl group and a terminal hydroxyl group, the hydroxyl value of the bifunctional polyester is 10-50 mgKOH/g, the acid value is 15-50 mgKOH/g, and the viscosity at 200 ℃ is 2500-5500 mPa & s. In this embodiment, the polyester model No. TI3905, produced by canthus, guangzhou, is used, and in other embodiments, other difunctional polyesters may be selected based on the above parameters.
The preparation method of the anti-graffiti powder coating in the embodiment comprises the following steps:
s1, weighing the raw materials in proportion, and mixing the weighed raw materials in a premix tank for 1-3 minutes so as to stir until the raw materials are uniformly mixed.
S2, feeding the weighed raw materials into a double-screw extruder for melt extrusion, wherein the screw rotating speed of the double-screw extruder is 40-50 Hz, the temperature of the 1 zone is 100-110 ℃, and the temperature of the 2 zone is 105-115 ℃. And cooling and tabletting the extruded molten material to obtain a flaky blank.
S3, crushing the blank into powder, and screening the powder by using a 180-mesh screen to obtain a finished product, wherein the median particle size of the finished product is 25-35 mu m.
Comparative example 1
In the comparative example, the powder coating comprises the following raw materials in percentage by mass:
| raw materials | Content (W%) | Manufacturer and model |
| Polyester | 56 | HN3307, guangzhou Optimus |
| Curing agent (tris (2, 3-epoxypropyl) isocyanate) | 4.2 | / |
| Flatting agent (Polypropylene ester) | 0.8 | / |
| Benzoinum | 0.5 | / |
| Barium sulfate | 21 | / |
| Pigment (I) | 1 | / |
The preparation method of the powder coating in this comparative example includes the following steps:
s1, weighing the raw materials in proportion, and mixing the weighed raw materials in a premix tank for 1-3 minutes so as to stir until the raw materials are uniformly mixed.
S2, feeding the weighed raw materials into a double-screw extruder for melt extrusion, wherein the screw rotating speed of the double-screw extruder is 40-50 Hz, the temperature of the 1 zone is 100-110 ℃, and the temperature of the 2 zone is 105-115 ℃. And cooling and tabletting the extruded molten material to obtain a flaky blank.
S3, crushing the blank into powder, and screening the powder by using a 180-mesh screen to obtain a finished product, wherein the median particle size of the finished product is 25-35 mu m.
Comparative example No. two
In the comparative example, the powder coating comprises the following raw materials in percentage by mass:
| raw materials | Content (W%) | Manufacturer and model |
| High hydroxyl number polyurethanes | 11 | 9003，LG |
| Low hydroxyl number polyurethanes | 22 | 9003，LG |
| Curing agent (isophorone diisocyanate) | 22 | / |
| Flatting agent (Polypropylene ester) | 0.8 | / |
| Benzoinum | 0.5 | / |
| Barium sulfate | 25 | / |
| Pigment (I) | 18.7 | / |
The preparation method of the powder coating in this comparative example includes the following steps:
s1, weighing the raw materials in proportion, and mixing the weighed raw materials in a premix tank for 1-3 minutes so as to stir until the raw materials are uniformly mixed.
S2, feeding the weighed raw materials into a double-screw extruder for melt extrusion, wherein the screw rotating speed of the double-screw extruder is 40-50 Hz, the temperature of the 1 zone is 100-110 ℃, and the temperature of the 2 zone is 105-115 ℃. And cooling and tabletting the extruded molten material to obtain a flaky blank.
S3, crushing the blank into powder, and screening the powder by using a 180-mesh screen to obtain a finished product, wherein the median particle size of the finished product is 25-35 mu m.
Comparative example No. three
In the comparative example, the powder coating comprises the following raw materials in percentage by mass:
| raw materials | Content (W%) | Manufacturer and model |
| Difunctional polyesters | 46 | TI3905, Guangzhou Optimus |
| Curing agent (tris (2, 3-epoxypropyl) isocyanate) | 3.5 | / |
| Curing agent (isophorone diisocyanate) | 8 | / |
| Flatting agent (Polypropylene ester) | 0.8 | / |
| Benzoinum | 0.5 | / |
| Barium sulfate | 25 | / |
| Pigment (I) | 16.2 | / |
The preparation method of the powder coating in this comparative example includes the following steps:
s1, weighing the raw materials in proportion, and mixing the weighed raw materials in a premix tank for 1-3 minutes so as to stir until the raw materials are uniformly mixed.
S2, feeding the weighed raw materials into a double-screw extruder for melt extrusion, wherein the screw rotating speed of the double-screw extruder is 40-50 Hz, the temperature of the 1 zone is 100-110 ℃, and the temperature of the 2 zone is 105-115 ℃. And cooling and tabletting the extruded molten material to obtain a flaky blank.
S3, crushing the blank into powder, and screening the powder by using a 180-mesh screen to obtain a finished product, wherein the median particle size of the finished product is 25-35 mu m.
The powder obtained in the first to third examples and the first to third comparative examples is tested, the powder coating is sprayed on an aluminum plate, a tin plate or a stainless steel plate with the thickness of 0.4-1.0mm by a high-voltage electrostatic spray gun, and is cured and reacted in a constant-temperature oven for 10-15 minutes to prepare a sample plate to be tested and carry out related tests, and the test results are as follows:
| test items | Example one | Example two | EXAMPLE III | Comparative example 1 | Comparative example No. two | Comparative example No. three |
| Dry adhesion | 0 | 0 | 0 | 0 | 0-1 | 0 |
| Impact test | By passing | By passing | By passing | By passing | Failed through | By passing |
| Hardness of pencil | 3H | 3H | 3H | 1H | 3H | 3H |
According to JG/T304-2011, the test sample is scrawled by an oil marking pen, and an anti-scrawl test is carried out, wherein the test result is as follows:
the above-described embodiments are merely preferred embodiments of the present invention, which is not intended to limit the present invention in any way. Those skilled in the art can make many changes and modifications to the disclosed embodiments, or modify equivalent embodiments to practice the disclosed embodiments, without departing from the scope of the disclosed embodiments. Therefore, equivalent variations made according to the idea of the present invention should be covered within the protection scope of the present invention without departing from the contents of the technical solution of the present invention.
Claims (8)
1. An anti-doodling powder coating is characterized in that: the material comprises the following raw materials in percentage by mass:
40-50% of bifunctional polyester;
10-14% of a curing agent;
0.5-1% of a leveling agent;
0.3-0.5% of benzoin;
0.5-1% of surface active auxiliary agent;
20-40% of barium sulfate;
1-20% of pigment.
2. The anti-graffiti powder coating of claim 1, wherein: the curing agent comprises tris (2, 3-epoxypropyl) isocyanate and isophorone diisocyanate, wherein the curing agent comprises tris (2, 3-epoxypropyl) isocyanate accounting for 3-4% of the total mass of the raw materials, and the isophorone diisocyanate accounting for 7-10% of the total mass of the raw materials.
3. The anti-graffiti powder coating of claim 1, wherein: the leveling agent is polypropylene ester.
4. The anti-graffiti powder coating of claim 1, wherein: the bifunctional polyester has a terminal carboxyl group and a terminal hydroxyl group, the hydroxyl value of the bifunctional polyester is 10-50 mgKOH/g, the acid value is 15-50 mgKOH/g, and the viscosity at 200 ℃ is 2500-5500 mPa & s.
5. A method for preparing the anti-graffiti powder coating according to claims 1 to 4, comprising the following steps:
s1, weighing the raw materials in proportion and stirring the raw materials until the raw materials are uniformly mixed;
s2, feeding the weighed raw materials into a double-screw extruder for melt extrusion, cooling and tabletting to obtain a flaky blank;
and S3, crushing the blank into powder to obtain a finished product.
6. The method of claim 5 for preparing an anti-graffiti powder coating, wherein the method comprises the following steps: in the step S1, the weighed raw materials are mixed in a premix tank for 1-3 minutes.
7. The method of claim 5 for preparing an anti-graffiti powder coating, wherein the method comprises the following steps: in the step S2, the screw rotating speed of the double-screw extruder is 40-50 Hz, the temperature of the zone 1 is 100-110 ℃, and the temperature of the zone 2 is 105-115 ℃.
8. The method of claim 5 for preparing an anti-graffiti powder coating, wherein the method comprises the following steps: in the step S3, the powder is sieved by a 180-mesh sieve, and the median particle size of the finished product is 25-35 μm.
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| CN202110655137.0A CN113512342A (en) | 2021-06-11 | 2021-06-11 | Anti-doodling powder coating and preparation method thereof |
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| CN202110655137.0A CN113512342A (en) | 2021-06-11 | 2021-06-11 | Anti-doodling powder coating and preparation method thereof |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107868235A (en) * | 2017-10-30 | 2018-04-03 | 广州擎天材料科技有限公司 | A kind of powdery paints difunctional polyester resin and preparation method thereof |
| CN109651950A (en) * | 2018-12-12 | 2019-04-19 | 东莞市爱粤金属粉末有限公司 | Anti-graffiti powdery paints and preparation method thereof |
| CN110669420A (en) * | 2019-10-10 | 2020-01-10 | 湖南连心科技有限公司 | Anti-doodling polyurethane powder coating and preparation method and application thereof |
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- 2021-06-11 CN CN202110655137.0A patent/CN113512342A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107868235A (en) * | 2017-10-30 | 2018-04-03 | 广州擎天材料科技有限公司 | A kind of powdery paints difunctional polyester resin and preparation method thereof |
| CN109651950A (en) * | 2018-12-12 | 2019-04-19 | 东莞市爱粤金属粉末有限公司 | Anti-graffiti powdery paints and preparation method thereof |
| CN110669420A (en) * | 2019-10-10 | 2020-01-10 | 湖南连心科技有限公司 | Anti-doodling polyurethane powder coating and preparation method and application thereof |
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