CN112143274A - Powder coating for ultrathin coating and preparation method and application thereof - Google Patents
Powder coating for ultrathin coating and preparation method and application thereof Download PDFInfo
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- CN112143274A CN112143274A CN202011101614.0A CN202011101614A CN112143274A CN 112143274 A CN112143274 A CN 112143274A CN 202011101614 A CN202011101614 A CN 202011101614A CN 112143274 A CN112143274 A CN 112143274A
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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
- C09D4/00—Coating compositions, e.g. paints, varnishes or lacquers, based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond ; Coating compositions, based on monomers of macromolecular compounds of groups C09D183/00 - C09D183/16
- C09D4/06—Organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond in combination with a macromolecular compound other than an unsaturated polymer of groups C09D159/00 - C09D187/00
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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
-
- 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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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Paints Or Removers (AREA)
Abstract
The invention relates to the technical field of ultrathin coatings of file cabinets, in particular to a powder coating for an ultrathin coating, a preparation method and application thereof, wherein the powder coating comprises the following components in parts by weight: 20-50 parts of polyester, 10-40 parts of epoxy resin, 1-2 parts of a flatting agent, 1-2 parts of a brightener, 0.1-0.4 part of benzoin, 1-15 parts of a flow aid, 20-50 parts of a pigment filler mixture and 2-8 parts of dimethacrylate. When the powder coating provided by the invention is applied, a coating with the thickness of 28-40 mu m can be manufactured, the one-time powder applying rate is more than 10 square meters/kg, the surface state is very good, the efficiency is greatly improved, and the cost is saved.
Description
Technical Field
The invention relates to the technical field of ultrathin coatings of file cabinets, in particular to a powder coating for an ultrathin coating, and a preparation method and application thereof.
Background
The ultra-thin coating powder is not only ultra-thin powder, but also micro solid particles, belongs to a transition region between micro particles and macro objects, and has a series of unique physical and chemical properties. With the reduction of the size of the superfine powder, the specific surface area and the surface energy of particles of the superfine powder are increased, and the particles are easy to agglomerate, so that the particle size of the particles is increased, and the functions of the superfine powder are easy to lose, thereby greatly limiting the application of the superfine powder. Therefore, the problem to be solved in the field is urgently needed to prevent the occurrence of agglomeration of the ultrafine powder and obtain the ultrafine powder with the particle size meeting the requirement and narrow distribution range so as to meet the requirement of coating the file cabinet.
The filing cabinet industry has developed rapidly in recent years, and filing cabinet manufacturing enterprises have higher and higher requirements on coating materials, namely powder coatings, such as: very smooth and fine surface state, thin coating (28-40um), high powder coating rate, high fluidity and other requirements.
However, the coating thickness of the existing powder coating enterprises generally requires 60-100um, the spraying area (i.e. the one-time powder coating rate) is 5-6 square meters/kg, the surface state is rough, and the surface has bright spots and is not fine. The reason is that the particle size of the powder coating is large, far exceeding the thickness of the ordinary paint film. Not only causes material waste, but also causes the performance reduction of the paint film due to too thick coating in many cases, such as easy coating falling off, reduced paint film hardness and the like.
Disclosure of Invention
The invention aims to overcome the defects of large coating thickness and low powdering rate in the prior art, and provides a powder coating for an ultrathin coating, a preparation method and application thereof.
In order to achieve the above object, a first aspect of the present invention provides a powder coating for an ultra-thin coating, comprising the following components in parts by weight: 20-50 parts of polyester, 10-40 parts of epoxy resin, 1-2 parts of a flatting agent, 1-2 parts of a brightener, 0.1-0.4 part of benzoin, 1-15 parts of a flow aid, 20-50 parts of a pigment filler mixture and 2-8 parts of dimethacrylate.
In a second aspect, the present invention provides a method for preparing the powder coating, the method comprising:
(1) carrying out first mixing on polyester, epoxy resin, a flatting agent and dimethacrylate;
(2) secondly, mixing the material obtained in the step (1) with a mixture of a brightener, benzoin, a flow aid and a pigment filler;
(3) and (3) grinding the material obtained in the step (2) in a grinding mill.
The third aspect of the invention provides the use of the powder coating in an ultra-thin coating of a file cabinet.
The inventor of the invention researches and discovers that the coating has excellent powdering rate, ultrathin coating thickness and fine surface state while ensuring the charging property, the flowability of powder micronization, good covering power and excellent physical property of electrostatic spraying of the coating by combining the dimethacrylate, the specific flow assistant and other components on the basis of the polyester, the epoxy resin and the leveling agent and adopting the specific proportion.
Moreover, when the powder coating prepared by the specific preparation method is applied, a coating with the thickness of 28-40 mu m can be prepared, the one-time powder applying rate is more than 10 square meters/kg, the surface state is very good, the efficiency is greatly improved, and the cost is saved.
Detailed Description
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.
The invention provides a powder coating for an ultrathin coating, which comprises the following components in parts by weight: 20-50 parts of polyester, 10-40 parts of epoxy resin, 1-2 parts of a flatting agent, 1-2 parts of a brightener, 0.1-0.4 part of benzoin, 1-15 parts of a flow aid, 20-50 parts of a pigment filler mixture and 2-8 parts of dimethacrylate.
Preferably, the powder coating comprises the following components in parts by weight: 20-30 parts of polyester, 10-30 parts of epoxy resin, 1-1.5 parts of flatting agent, 1-1.5 parts of brightener, 0.1-0.3 part of benzoin, 1-5 parts of flow additive, 20-30 parts of pigment filler and 2-4 parts of dimethacrylate.
According to the present invention, the polyester can be selected from a wide range, as long as it is advantageous to improve the performance of the powder coating, for example, polyester is available from Xinte horse Synthomer powder coating resin Albaster SilkyMatt 6580.
Preferably, the polyester is a saturated polyester, the saturated polyester satisfying: the acid value is 30-75mgKOH/g, and the Tg is more than or equal to 55 ℃. The inventor further researches and discovers that the covering power and the powdering rate of the powder coating can be further improved by adopting the preferred scheme of the invention, so that the powder coating can have a better and fine surface state when being applied, and the ultrathin coating performance of the powder coating can be improved.
More preferably, the saturated polyester satisfies: the acid value is 30-45mgKOH/g, and the Tg is 55-65 ℃.
According to the invention, preferably, the epoxy resin is bisphenol A type E-12 epoxy resin, and the epoxy equivalent is 730-850 g/eq.
According to the present invention, preferably, the flow aid is at least one of hydrophobic fumed silica, nano alumina, and wax. In the present invention, the hydrophobic fumed silica is commercially available, for example, from Hubei Huichi Rich nanomaterials, Inc. In the present invention, the wax may be a wax conventionally used in the field of powder coatings, and may be, for example, a polyethylene wax and/or a polytetrafluoroethylene-modified polyethylene wax, all of which are commercially available.
More preferably, the flow aid is a mixture of hydrophobic fumed silica, nano alumina and wax, wherein the weight ratio of the hydrophobic fumed silica, the nano alumina and the wax is 1:1-3: 1-4. The inventors have found that this preferred embodiment is more advantageous in improving the ultra-thin coating properties of the powder coating.
In the present invention, the pigment-filler mixture refers to a mixture of a pigment and a filler, and the pigment and the filler are not limited at all and may be of a type conventional in the art. Preferably, the pigment is at least one selected from iron yellow, iron red, chromium green, lemon yellow, medium chrome yellow, phthalocyanine blue, aluminum powder, silica, white carbon black, quartz powder and wollastonite. Preferably, the filler is selected from at least one of calcium carbonate, barium sulfate, bentonite, talc and quartz powder.
In the invention, the weight ratio of the pigment to the filler in the pigment filler mixture is 1: 0.2-2.
In the present invention, the gloss enhancer is not limited at all, and is a gloss enhancer for a conventional coating in the art, and those skilled in the art can freely select the gloss enhancer according to actual needs, for example, a BH-2000A coating gloss enhancer produced by environmental protection technologies ltd, baihong guan, dong guan, can be used.
According to a preferred embodiment of the present invention, the powder coating for an ultra-thin coating comprises the following components in parts by weight: 20-50 parts of polyester, 10-40 parts of epoxy resin, 1-2 parts of a flatting agent, 1-2 parts of a brightener, 0.1-0.4 part of benzoin, 1-15 parts of a flow aid, 20-50 parts of a pigment filler mixture and 2-8 parts of dimethacrylate;
the polyester is saturated polyester, and the saturated polyester meets the following requirements: the acid value is 30-75mgKOH/g, and the Tg is more than or equal to 55 ℃;
the epoxy resin is bisphenol A type E-12 epoxy resin, and the epoxy equivalent is 730-850 g/eq;
the flow auxiliary agent is at least one of hydrophobic fumed silica, nano alumina and wax.
According to the invention, based on polyester, epoxy resin and a leveling agent, the dimethyl acrylate is matched, and the specific flow additive and other components are matched, and the specific proportion is adopted, so that the electrostatic charging property of the coating electrostatic spraying can be improved, the flowability of the powder micronization can be ensured, and meanwhile, the good covering power, the good powdering rate, the fine surface state and the excellent physical and chemical properties of the powder coating are ensured.
In a second aspect, the present invention provides a method for preparing the powder coating of the first aspect, the method comprising:
(1) carrying out first mixing on polyester, epoxy resin, a flatting agent and dimethacrylate;
(2) secondly, mixing the material obtained in the step (1) with a mixture of a brightener, benzoin, a flow aid and a pigment filler;
(3) and (3) grinding the material obtained in the step (2) in a grinding mill.
According to the present invention, preferably, the conditions of the first mixing include: the temperature is 120-140 ℃ and the time is 1-5 h. More preferably, the conditions of the first mixing include: the temperature is 120-130 ℃, and the time is 1-3 h.
According to the present invention, preferably, the conditions of the second mixing include: the temperature is 70-90 ℃ and the time is 1-5 h. More preferably, the conditions of the second mixing include: the temperature is 70-80 ℃ and the time is 1-3 h.
In the invention, the pulverizer is preferably an ACM pulverizer.
In the present invention, preferably, in the step (2), the material obtained in the step (1) is cooled to room temperature, and then the second mixing is performed.
In the present invention, preferably, in the step (3), the material obtained in the step (2) is cooled to room temperature, and then the grinding is performed.
In the present invention, the time for the milling is not limited and can be freely selected by those skilled in the art, and preferably, the time for milling is 1 to 4 hours.
According to a preferred embodiment of the present invention, the method for preparing the powder coating comprises:
(1) polyester, epoxy resin, a flatting agent and dimethacrylate are mixed for the first time for 1 to 5 hours at the temperature of 120-140 ℃;
(2) cooling the material obtained in the step (1) to room temperature, and then mixing the material with a mixture of a brightener, benzoin, a flow aid and a pigment filler at 70-90 ℃ for 1-5 hours;
(3) and (3) cooling the material obtained in the step (2) to room temperature, and then grinding in an ACM (Acrylonitrile-butadiene-styrene) grinding machine.
When the powder coating prepared by the specific preparation method is applied, a coating with the thickness of 28-40 mu m can be prepared, the one-time powder applying rate is more than 10 square meters/kg, the surface state is very good, the efficiency is greatly improved, and the cost is saved.
The third aspect of the invention provides the use of the powder coating in an ultra-thin coating of a file cabinet. The powder coating provided by the invention is more suitable for being used in an ultrathin coating of a file cabinet.
The present invention will be described in detail below by way of examples. In the following examples, the starting materials are all commercially available products unless otherwise specified;
wherein, polyester A in examples 1 to 3: saturated polyester with an acid value of 40mgKOH/g and a Tg of 60 ℃ was purchased from Xinte Ma Synthomer powder coating resin Albester SilkyMatt 6580;
epoxy resin a in examples 1 to 3: bisphenol A type E-12 epoxy resin with the epoxy equivalent of 800 g/eq;
flow aid a in examples 1-3: a mixture of hydrophobic fumed silica (available from Hubei Rich nano materials GmbH), nano-alumina and wax (Kelaien polyethylene wax powder 9615A), wherein the weight ratio of the hydrophobic fumed silica, the nano-alumina and the wax is 1:1: 1;
pigment filler mixture: a mixture of pigment (carbon black) and filler (calcium carbonate) in a pigment to filler weight ratio of 1: 0.8;
a brightener: BH-2000A coating polishing agent produced by Baihong environmental protection science and technology Limited of Dongguan city;
benzoin: KV203 benzoin purchased from Zhaoqing Kewei coating materials Co., Ltd;
leveling agent: a BYK333 leveling agent.
Example 1
(1) Carrying out first mixing on polyester, epoxy resin, a flatting agent and dimethacrylate at 120 ℃ for 2 h;
(2) cooling the material obtained in the step (1) to room temperature, and then mixing the material with a mixture of a brightener, benzoin, a flow aid and a pigment filler at 90 ℃ for 2.5 hours;
(3) and (3) cooling the material obtained in the step (2) to room temperature, and then grinding the material in an ACM (Acrylonitrile butadiene styrene) mill for 2 hours.
The amounts of the above raw materials are shown in table 1.
Example 2
(1) Firstly mixing polyester, epoxy resin, a flatting agent and dimethacrylate at 130 ℃ for 1 h;
(2) cooling the material obtained in the step (1) to room temperature, and then mixing the material with a mixture of a brightener, benzoin, a flow aid and a pigment filler at 70 ℃ for 3 hours;
(3) and (3) cooling the material obtained in the step (2) to room temperature, and then grinding the material in an ACM (Acrylonitrile butadiene styrene) mill for 2 hours.
The amounts of the above raw materials are shown in table 1.
Example 3
(1) Carrying out first mixing on polyester, epoxy resin, a flatting agent and dimethacrylate at 140 ℃ for 2 h;
(2) cooling the material obtained in the step (1) to room temperature, and then mixing the material with a mixture of a brightener, benzoin, a flow aid and a pigment filler at 80 ℃ for 2 hours;
(3) and (3) cooling the material obtained in the step (2) to room temperature, and then grinding the material in an ACM (Acrylonitrile butadiene styrene) mill for 2 hours.
The amounts of the above raw materials are shown in table 1.
Examples 4 to 5
The procedure of example 1 was repeated, except that the amounts of the raw materials used were changed to those shown in Table 1.
Example 6
The procedure of example 1 was followed except that the raw materials were mixed in a different manner, specifically, the raw materials were directly mixed at 90 ℃ for 4.5 hours, and then ground as described in step (3) of example 1.
Example 7
The procedure is as in example 1, except that the same amount of nano-alumina is used as flow aid B instead of the hydrophobic fumed silica, nano-alumina and wax as flow aid a.
Example 8
The procedure was as in example 1, except that the polyester A was replaced with the same amount of polyester B (saturated polyester, acid value of 100mgKOH/g, Tg of 40 ℃) and that the epoxy resin A was replaced with the same amount of epoxy resin B (bisphenol A type E-12 epoxy resin, epoxy equivalent of 400 g/eq).
Comparative example 1
The procedure is as in example 1, except that no dimethacrylate is added, otherwise the procedure is as in example 1.
TABLE 1
Test example
The powder coatings prepared in examples 1 to 8 and comparative example 1 were applied to an automatic spray gun of an FW270-A liquid electrostatic spray gun, manufactured by Feisng coating Equipment science and technology Co., Ltd, of Dongguan to perform ultra-thin spray coating on a file cabinet at a baking temperature of 170 ℃ to test the spray coating performance. The film thickness of the coating was measured according to GB/T13452.2.
TABLE 2
As can be seen from the results in table 2, the embodiment of the present invention has significantly better effect, specifically, ultra-thin coating can be obtained, and the powder applying rate at one time is high and the required drying time is short.
In addition, the comparative examples are not prior art, but are only provided for comparison with the present invention, and should not be construed as limiting the present invention.
The preferred embodiments of the present invention have been described above in detail, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention, including combinations of various technical features in any other suitable way, and these simple modifications and combinations should also be regarded as the disclosure of the invention, and all fall within the scope of the invention.
Claims (10)
1. The powder coating for the ultrathin coating is characterized by comprising the following components in parts by weight: 20-50 parts of polyester, 10-40 parts of epoxy resin, 1-2 parts of a flatting agent, 1-2 parts of a brightener, 0.1-0.4 part of benzoin, 1-15 parts of a flow aid, 20-50 parts of a pigment filler mixture and 2-8 parts of dimethacrylate.
2. The powder coating according to claim 1, wherein the powder coating comprises the following components in parts by weight: 20-30 parts of polyester, 10-30 parts of epoxy resin, 1-1.5 parts of flatting agent, 1-1.5 parts of brightener, 0.1-0.3 part of benzoin, 1-5 parts of flow additive, 20-30 parts of pigment filler and 2-4 parts of dimethacrylate.
3. The powder coating according to claim 1 or 2, wherein the polyester is a saturated polyester satisfying: the acid value is 30-75mgKOH/g, and the Tg is more than or equal to 55 ℃.
4. The powder coating according to claim 3, wherein the saturated polyester satisfies: the acid value is 30-45mgKOH/g, and the Tg is 55-65 ℃.
5. The powder coating according to claim 1 or 2, wherein the epoxy resin is bisphenol a type E-12 epoxy resin, and the epoxy equivalent is 730-.
6. The powder coating according to claim 1 or 2, wherein the flow aid is at least one of hydrophobic fumed silica, nano alumina, and wax.
7. A process for the preparation of a powder coating according to any one of claims 1 to 5, which process comprises:
(1) carrying out first mixing on polyester, epoxy resin, a flatting agent and dimethacrylate;
(2) secondly, mixing the material obtained in the step (1) with a mixture of a brightener, benzoin, a flow aid and a pigment filler;
(3) and (3) grinding the material obtained in the step (2) in a grinding mill.
8. The method of claim 7, wherein the conditions of the first mixing comprise: the temperature is 120-140 ℃ and the time is 1-5 h.
9. The method of claim 7 or 8, wherein the conditions of the second mixing comprise: the temperature is 70-90 ℃ and the time is 1-5 h.
10. Use of the powder coating according to any one of claims 1 to 5 in an ultra-thin coating for a file cabinet.
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| CN202011101614.0A CN112143274A (en) | 2020-10-14 | 2020-10-14 | Powder coating for ultrathin coating and preparation method and application thereof |
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| CN202011101614.0A CN112143274A (en) | 2020-10-14 | 2020-10-14 | Powder coating for ultrathin coating and preparation method and application thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115093775A (en) * | 2022-06-29 | 2022-09-23 | 洛阳乐卡粉末有限公司 | Ultrathin low-gloss powder coating and preparation method thereof |
Citations (3)
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|---|---|---|---|---|
| EP0480120A2 (en) * | 1990-10-12 | 1992-04-15 | Mitsui Toatsu Chemicals, Inc. | A resin composition for powder coatings |
| CN109207030A (en) * | 2018-09-07 | 2019-01-15 | 安徽恒隆新材料有限公司 | A kind of high glaze polyester resin for powder coating and the preparation method and application thereof |
| CN111073455A (en) * | 2019-12-31 | 2020-04-28 | 广东睿智环保科技有限责任公司 | Low-energy-consumption powder coating for coating wheel hub |
-
2020
- 2020-10-14 CN CN202011101614.0A patent/CN112143274A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0480120A2 (en) * | 1990-10-12 | 1992-04-15 | Mitsui Toatsu Chemicals, Inc. | A resin composition for powder coatings |
| CN109207030A (en) * | 2018-09-07 | 2019-01-15 | 安徽恒隆新材料有限公司 | A kind of high glaze polyester resin for powder coating and the preparation method and application thereof |
| CN111073455A (en) * | 2019-12-31 | 2020-04-28 | 广东睿智环保科技有限责任公司 | Low-energy-consumption powder coating for coating wheel hub |
Non-Patent Citations (1)
| Title |
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| 吴小源: "《铝合金型材表面处理技术》", 30 April 2009, 北京冶金工业出版社 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115093775A (en) * | 2022-06-29 | 2022-09-23 | 洛阳乐卡粉末有限公司 | Ultrathin low-gloss powder coating and preparation method thereof |
| CN115093775B (en) * | 2022-06-29 | 2023-12-26 | 洛阳乐卡粉末有限公司 | Ultrathin low-gloss powder coating and preparation method thereof |
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