CN112300673A - Modified nano polyester powder coating and preparation method thereof - Google Patents
Modified nano polyester powder coating and preparation method thereof Download PDFInfo
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- CN112300673A CN112300673A CN202011272127.0A CN202011272127A CN112300673A CN 112300673 A CN112300673 A CN 112300673A CN 202011272127 A CN202011272127 A CN 202011272127A CN 112300673 A CN112300673 A CN 112300673A
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- powder coating
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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
- C09D167/06—Unsaturated polyesters having carbon-to-carbon unsaturation
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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
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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
-
- 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
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
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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
- C08K3/30—Sulfur-, selenium- or tellurium-containing compounds
- C08K2003/3045—Sulfates
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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
- C08K2201/011—Nanostructured additives
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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
- C08K2201/014—Additives containing two or more different additives of the same subgroup in C08K
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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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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Paints Or Removers (AREA)
Abstract
The invention belongs to the technical field of powder coating preparation, and particularly relates to a modified nano polyester powder coating and a preparation method thereof, wherein the modified nano polyester powder coating comprises the following raw material components, by weight, 54-70% of titanium dioxide modified unsaturated polyester resin, 4-6% of curing agent triglycidyl isocyanurate, 5-15% of solid pigment, 2-5% of solid auxiliary agent and 8-20% of solid filler, wherein the solid filler comprises precipitated barium sulfate, 1500-mesh barium sulfate, 2000-mesh calcium carbonate and 800-mesh calcium carbonate.
Description
Technical Field
The invention belongs to the technical field of powder coating preparation, and particularly relates to a modified nano polyester powder coating and a preparation method thereof.
Background
The powder coating is a novel solid powder coating which is prepared by mixing resin, a curing agent, pigment, filler, an auxiliary agent and the like, coating the mixture on the surface of a coated object in an electrostatic spraying mode, and then baking the mixture to melt, level and solidify the mixture. The paint does not use solvent, has the characteristics of environmental protection, recoverability, energy and resource conservation, lower labor intensity, high mechanical strength of film coating, strong corrosion resistance and the like, and becomes well-known 4E type (high production efficiency, excellent film coating performance, ecological environmental protection and economy) paint.
Powder coatings are being used in an ever-expanding range of applications because they emit little volatile harmful gas to the environment when applied and cured, and do not cause environmental problems such as air pollution. However, when the resin and the curing agent are kneaded by heating and melting, the powder coating has poor leveling property due to the dispersion unevenness of the curing agent, and thus has a problem of poor appearance of the coating film. In addition, the dispersibility of pigments and fillers is poor, and it is difficult to obtain a clear, sharp and glossy coating film in powder coating materials as compared with liquid coating materials. The application of the nanotechnology in the coating industry promotes the renewal of coatings, so that the powder coating really becomes an environment-friendly coating, and a breakthrough development direction is created. The optical characteristics of the nano material are utilized to decompose the radiation of ultraviolet rays, so that the weather resistance and the aging resistance of the coating are improved; the nano particles are uniformly dispersed in the organic polymer to form a dispersed core nano composite coating by utilizing high dispersibility, so that the advection of the nano coating is improved. Has the characteristics of thin coating, material saving, strong adhesive force, good toughness and the like. Sunscreen oil and cosmetics for absorbing ultraviolet rays by combining nanoparticles with resin are put on the market, and Chinese patent 01110586.0 mentions an aqueous nano environment-friendly coating for walls, and patent reports about nano polyester powder coating are not found.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a modified nano polyester powder coating and a preparation method thereof, wherein the modified nano polyester powder coating has the advantages of good storage stability, strong impact resistance, good adhesive force, better coating film flexibility and impact resistance, and can meet the test requirements in a salt spray test and a UVB test.
The invention relates to a modified nano polyester powder coating, which comprises the following raw material components, by weight, 54-70% of titanium dioxide modified unsaturated polyester resin, 4-6% of curing agent triglycidyl isocyanurate, 5-15% of solid pigment, 2-5% of solid auxiliary agent and 8-20% of solid filler, wherein the solid filler comprises precipitated barium sulfate, 1500-mesh barium sulfate, 2000-mesh calcium carbonate and 800-mesh calcium carbonate.
Preferably, the paint comprises the following raw material components, by weight, 65% of titanium dioxide modified unsaturated polyester resin, 4% of curing agent triglycidyl isocyanurate, 10% of solid pigment, 5% of solid auxiliary agent and 16% of solid filler.
The weight ratio of the precipitated barium sulfate to the 1500-mesh barium sulfate to the 2000-mesh calcium carbonate to the 800-mesh calcium carbonate is preferably 1:1:1: 1.
The solid auxiliary agent comprises a leveling agent, a brightening agent, a defoaming agent, an anti-wear agent, a dispersing agent and a delustering agent.
The solid pigment comprises one or more of titanium dioxide, carbon black, permanent yellow, iron red, phthalocyanine blue, permanent red and phthalocyanine green.
The preparation method of the unsaturated polyester resin modified by the titanium dioxide comprises the steps of adding the nano titanium dioxide into the unsaturated polyester resin, and stirring to obtain the unsaturated polyester resin modified by the titanium dioxide, wherein the weight of the nano titanium dioxide is 1-5% of that of the unsaturated polyester resin.
The invention provides a preparation method of modified nano polyester powder coating, which comprises the following steps,
1) after the materials are prepared, mixing and stirring the raw materials;
2) pouring the stirred raw materials into an extruder, controlling the temperature of the extruder at 100-120 ℃ to melt the raw materials, and then tabletting and crushing the raw materials;
3) and pouring the crushed materials into a powder shearing machine, and grinding into powder of 30-45 mu m to obtain the modified nano polyester powder coating.
The stirring time was 5 min.
The temperature of the extruder was controlled at 115 ℃.
The particle size of the material crushed in the step 2) is 150-300 mu m.
The invention has the beneficial effects that a certain amount of titanium dioxide is added into the rigid unsaturated polyester resin, so that the ultraviolet resistance is excellent, and the flexibility and the impact resistance of the prepared weather-resistant polyester resin powder coating can be obviously improved.
According to the invention, different kinds and meshes of products are selected, namely precipitated barium sulfate, 1500 meshes of barium sulfate, 2000 meshes of calcium carbonate and 800 meshes of calcium carbonate are selected as fillers, and compared with the method for selecting single meshes of barium sulfate or calcium carbonate, the product obtained by the method has better adhesive force and storage stability.
Detailed Description
The various chemicals and reagents used in the examples of the present invention were all commercially available.
Example 1
The modified nanometer polyester powder paint consists of unsaturated polyester resin modified with titania 65 wt%, curing agent triglycidyl isocyanurate 4 wt%, solid pigment 10 wt%, solid assistant 5 wt% and solid stuffing 16 wt%, and the solid stuffing includes precipitated barium sulfate, 1500 mesh barium sulfate, 2000 mesh calcium carbonate and 800 mesh calcium carbonate.
The weight ratio of the precipitated barium sulfate to the 1500-mesh barium sulfate to the 2000-mesh calcium carbonate to the 800-mesh calcium carbonate is preferably 1:1:1: 1.
The solid auxiliary agent comprises a leveling agent, a brightening agent, a defoaming agent, an anti-wear agent, a dispersing agent and a delustering agent.
The solid pigment comprises one or more of titanium dioxide, carbon black, permanent yellow, iron red, phthalocyanine blue, permanent red and phthalocyanine green.
The preparation method of the unsaturated polyester resin modified by the titanium dioxide comprises the steps of adding the nano titanium dioxide into the unsaturated polyester resin, and stirring to obtain the unsaturated polyester resin modified by the titanium dioxide, wherein the weight of the nano titanium dioxide is 3% of that of the unsaturated polyester resin.
A preparation method of modified nano polyester powder coating comprises the following steps,
1) after the materials are prepared, pouring the raw materials into a mixing tank, mixing, stirring for 5min, fully mixing, uniformly stirring, and discharging for later use;
2) pouring the mixed raw materials into an extruder, controlling the temperature of the extruder at 115 ℃, ensuring that the powder is not solidified but can be molten, extruding the materials to fully melt and mix the materials, tabletting the materials by a tabletting machine, and then crushing the materials to obtain coarse crushed materials;
3) and pouring the crushed materials into a powder shearing machine, and grinding into powder of 30-45 mu m to obtain the modified nano polyester powder coating.
Comparative example 1
This comparative example 1 differs from example 1 in that the solid filler of example 1 is replaced by 1500 mesh barium sulfate and 1500 mesh calcium carbonate (ratio of both 1: 1). The rest is the same as in example 1.
Comparative example 2
Comparative example 2 differs from example 1 in that the temperature of the extruder in step 2) was 100 ℃ in the preparation of the powder coating, and the material was not tabletted but directly pulverized after extrusion. The rest is the same as in example 1.
The powder coatings obtained in example 1 and comparative examples 1-2 were compared to obtain a table of results of performance tests as shown in Table 1.
Table 1 table of performance test results
| Test items | Example 1 | Comparative example 1 | Comparative example 2 |
| Film thickness | 70-100μm | 70-100μm | 70-100μm |
| Storage stability (three weeks at 40 ℃ C.) | Without agglomeration | Slightly agglomerated | Slightly agglomerated |
| Particle size | 30-40μm | 30-40μm | 30-40μm |
| Impact resistance (front and back 50 kg/cm)2) | Does not crack | Does not crack | Does not crack |
| Adhesion force | Level 1 | Stage 2 | Stage 2 |
| Salt spray test (500h) | Qualified | Qualified | Fail to be qualified |
| UVB test (1000h) | Qualified | Fail to be qualified | Qualified |
From the analysis of table 1 above, it can be seen that the product of example 1 is significantly superior to the comparative example in storage stability and has better adhesion, and can pass both the salt spray test and the UVB test.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. The modified nano polyester powder coating is characterized by comprising, by weight, 54-70% of titanium dioxide modified unsaturated polyester resin, 4-6% of curing agent triglycidyl isocyanurate, 5-15% of solid pigment, 2-5% of solid auxiliary agent and 8-20% of solid filler, wherein the solid filler comprises precipitated barium sulfate, 1500-mesh barium sulfate, 2000-mesh calcium carbonate and 800-mesh calcium carbonate.
2. The modified nano polyester powder coating as claimed in claim 1, which comprises the following raw material components, by weight, 65% of titanium dioxide modified unsaturated polyester resin, 4% of curing agent triglycidyl isocyanurate, 10% of solid pigment, 5% of solid auxiliary agent and 16% of solid filler.
3. The modified nano polyester powder coating as claimed in claim 1, wherein the weight ratio of the precipitated barium sulfate, 1500 mesh barium sulfate, 2000 mesh calcium carbonate and 800 mesh calcium carbonate is 1:1:1: 1.
4. The modified nano polyester powder coating according to any one of claims 1 to 3, wherein the solid auxiliary agent comprises a leveling agent, a brightening agent, a defoaming agent, an anti-wear agent, a dispersing agent and a matting agent.
5. The modified nano polyester powder coating of any one of claims 1 to 3, wherein the solid pigment comprises one or more of titanium dioxide, carbon black, permanent yellow, iron red, phthalocyanine blue, permanent red, and phthalocyanine green.
6. The modified nano polyester powder coating as claimed in any one of claims 1 to 3, wherein the titanium dioxide modified unsaturated polyester resin is prepared by adding nano titanium dioxide to unsaturated polyester resin and stirring to obtain titanium dioxide modified unsaturated polyester resin, wherein the weight of nano titanium dioxide is 1 to 5% of the weight of unsaturated polyester resin.
7. A process for the preparation of the modified nano polyester powder coating according to any of claims 1 to 6, characterized by comprising the steps of,
1) after the materials are prepared, mixing and stirring the raw materials;
2) pouring the stirred raw materials into an extruder, controlling the temperature of the extruder at 100-120 ℃ to melt the raw materials, and then tabletting and crushing the raw materials;
3) and pouring the crushed materials into a powder shearing machine, and grinding into powder of 30-45 mu m to obtain the modified nano polyester powder coating.
8. The process according to claim 7, wherein the stirring is carried out for 5 min.
9. The process according to claim 7 or 8, wherein the temperature of the extruder is controlled to 115 ℃.
10. The process according to claim 7 or 8, wherein the particle size of the pulverized material obtained in step 2) is 150-300 μm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011272127.0A CN112300673A (en) | 2020-11-13 | 2020-11-13 | Modified nano polyester powder coating and preparation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011272127.0A CN112300673A (en) | 2020-11-13 | 2020-11-13 | Modified nano polyester powder coating and preparation method thereof |
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| CN112300673A true CN112300673A (en) | 2021-02-02 |
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| CN202011272127.0A Pending CN112300673A (en) | 2020-11-13 | 2020-11-13 | Modified nano polyester powder coating and preparation method thereof |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1450133A (en) * | 2003-04-12 | 2003-10-22 | 宁波市鄞州东海粉末涂料有限公司 | Nano polyester powder coating |
| CN1462782A (en) * | 2003-06-02 | 2003-12-24 | 四川大学 | Weather-resistant type coating material of polyester powder modified by inorganic nano composite material |
| CN101445692A (en) * | 2008-10-09 | 2009-06-03 | 四川大学 | Super weatherability nano-compound modified polyester powder coating and preparation method thereof |
-
2020
- 2020-11-13 CN CN202011272127.0A patent/CN112300673A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1450133A (en) * | 2003-04-12 | 2003-10-22 | 宁波市鄞州东海粉末涂料有限公司 | Nano polyester powder coating |
| CN1462782A (en) * | 2003-06-02 | 2003-12-24 | 四川大学 | Weather-resistant type coating material of polyester powder modified by inorganic nano composite material |
| CN101445692A (en) * | 2008-10-09 | 2009-06-03 | 四川大学 | Super weatherability nano-compound modified polyester powder coating and preparation method thereof |
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