CN110760238A - Powder coating and preparation method thereof - Google Patents
Powder coating and preparation method thereof Download PDFInfo
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- CN110760238A CN110760238A CN201911043643.3A CN201911043643A CN110760238A CN 110760238 A CN110760238 A CN 110760238A CN 201911043643 A CN201911043643 A CN 201911043643A CN 110760238 A CN110760238 A CN 110760238A
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- coating
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- powder coating
- powder
- epoxy resin
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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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G59/00—Polycondensates containing more than one epoxy group per molecule; Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
- C08G59/18—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing
- C08G59/40—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing characterised by the curing agents used
- C08G59/4007—Curing agents not provided for by the groups C08G59/42 - C08G59/66
- C08G59/4014—Nitrogen containing compounds
- C08G59/4021—Ureas; Thioureas; Guanidines; Dicyandiamides
-
- 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
-
- 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
- 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
- C09D5/08—Anti-corrosive paints
-
- 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
-
- 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
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
Abstract
The invention belongs to the field of materials, and discloses a powder coating which comprises the following components in parts by weight: 200 parts of 150-200 parts of epoxy resin, 10-50 parts of modified epoxy resin, 5-20 parts of curing agent, 0.1-3 parts of curing accelerator, 50-150 parts of filler, 5-20 parts of assistant and 0.5-10 parts of pigment, wherein the powder coating has good insulativity, high pressure resistance, acid and alkali resistance and organic solvent resistance, and when the powder coating is sprayed for 200-300 mu m, the coating is not broken down under 5000V voltage; after baking at 155 ℃ for 400 hours, the coating is not broken down at 5000 volts; the insulation grade is F; the coating is soaked in acetone for 2 hours, butanone for 4 hours and xylene for 24 hours, and the coating does not soften or fall off; the coating is soaked in 10% hydrochloric acid solution or 10% NaOH solution for 10 days, and the coating does not foam or fall off.
Description
Technical Field
The invention belongs to the field of materials, and particularly relates to a powder coating and a preparation method thereof.
Background
The powder coating is a solid powder resin coating composed of resin, pigment, filler, auxiliary agent and the like, and compared with common solvent-based coatings and water-based coatings, the dispersion medium of the powder coating is not solvent and water, but air. Therefore, the coating has the characteristics of no solvent pollution, 100 percent film formation, high coating efficiency, excellent coating performance and low energy consumption.
With the wide use of powder coatings, the powder coatings also occupy more and more important positions in insulating materials for electronics and motors, and the powder coatings are widely applied to various fields of the motors, the electronics, the automobile industry, the aeronautical machinery and the like. However, because high-voltage machines or materials such as high-voltage electrical appliances, high-voltage coils, inductance magnetic coils and the like are in a high-voltage environment during working, the voltage of the high-voltage machines or materials reaches more than 5000 volts, and organic solvents, acid and alkali solutions and the like can be contacted with the high-voltage machines or materials, higher requirements are provided for the insulativity, high-voltage resistance, acid and alkali resistance and organic solvent resistance of the coating used by the high-voltage machines or materials, but the existing powder coating cannot meet the requirements at the same time, and the popularization and application of the insulating powder coating in the field are greatly restricted.
Therefore, it is necessary to provide a powder coating which is resistant to high pressure, acid and alkali, and organic solvents.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the powder coating provided by the invention can resist high pressure, acid and alkali and organic solvent.
The powder coating comprises the following components in parts by weight:
preferably, the powder coating comprises the following components in parts by weight:
the epoxy resin is bisphenol A type epoxy resin.
Preferably, the bisphenol A type epoxy resin has an epoxy equivalent of 400-1000 g/eq; further preferably, the bisphenol A type epoxy resin has an epoxy equivalent of 600-900 g/eq; more preferably, the bisphenol A type epoxy resin has an epoxy equivalent of 600-700 g/eq.
The modified epoxy resin is silane modified epoxy resin.
Preferably, the epoxy equivalent of the silane modified epoxy resin is 100-500 g/eq; further preferably, the epoxy equivalent of the silane-modified epoxy resin is 200-350 g/eq.
The filler comprises mica powder, and preferably, the mica powder accounts for 50-100% of the mass of the filler.
The filler may also comprise barium sulphate and/or silica fume.
The curing agent is a cyanamide compound, preferably, the curing agent is dicyandiamide, and the melting point of the dicyandiamide is 209.5 ℃.
The curing accelerator is imidazole or imidazole derivatives, and preferably, the curing accelerator is 2-methylimidazole.
The auxiliary agent is at least one of a leveling agent, an antioxidant, a defoaming agent or an adhesion force increasing agent.
The antifoaming agent is benzoin (benzoin).
The pigment is universal pigment for powder coating, such as organic red, carbon black, iron yellow and ultramarine.
The particle size of the powder coating is 10-50 mu m; preferably, the particle size of the powder coating is 25-40 μm.
A method for preparing a powder coating, comprising the steps of: weighing the components in proportion, mixing, crushing, melting, extruding, tabletting and crushing to obtain the powder coating.
Specifically, the preparation method of the powder coating comprises the following steps:
weighing the components in proportion, and then placing the materials in a stirrer to be fully mixed and crushed for 5-15 min; and melting and extruding the mixed materials on an extruder, tabletting, cooling, crushing and screening the sheet materials, magnetizing at a powder outlet, and removing metal impurities to obtain the powder coating.
The temperature of the melt extrusion is 90-105 ℃ in the first zone and 120 ℃ in the second zone, preferably, the temperature of the melt extrusion in the step (2) is 100 ℃ in the first zone and 110 ℃ in the second zone.
The coating is prepared by spraying the powder coating and curing at 200 ℃ for 5-10 min. The thickness of the coating is 100-300 μm.
An electrical device comprising the coating.
Applying the powder coating to a machine or material for high pressure.
Compared with the prior art, the invention has the following beneficial effects:
epoxy resin and silane modified epoxy resin are used as resin main bodies, and cyanamide compounds are used as curing agents, so that the reaction crosslinking density is high. After the siloxane structure in the silane modified epoxy resin is reacted and cured, the siloxane part migrates to the surface, so that the surface of the coating has the performance similar to that of organosilicon, and the hydrophobicity and the thermal stability of the coating are increased. Meanwhile, a large amount of mica powder is added into the powder coating as a filler, and silicon dioxide and aluminum oxide in the mica powder are compounded to form a compound silicon oxide layer which is macroscopically represented as a sheet structure; in the coating process, the mica wafer lies down under the action of surface tension before the paint film is cured, and automatically forms a structure which is parallel to each other and the surface of the paint film, and the orientation of the mica wafer is just vertical to the direction of corrosive substances penetrating through the paint film in the layer-by-layer arrangement, so that the blocking effect is strong; and mica has extremely high resistance and is an excellent insulating material, and after being mixed with resin, the insulativity and high voltage resistance of the coating are enhanced.
Therefore, the powder coating has good insulativity, high pressure resistance, acid and alkali resistance and organic solvent resistance, and the coating is not broken down under the voltage of 5000V when the powder coating is sprayed for 200-300 mu m; after the coating is continuously baked for 400 hours at 155 ℃, the coating is not broken down under 5000 volts; the insulation grade is F; the coating is soaked in acetone for 2 hours, butanone for 4 hours and xylene for 24 hours, and the coating does not have softening and falling phenomena; the coating is soaked in a hydrochloric acid solution with the mass concentration of 10% or a NaOH solution with the mass concentration of 10% for 10 days, and the coating does not foam and fall off.
The powder coating disclosed by the invention is simple in formula, energy-saving and environment-friendly, can partially replace paint coating products, and has zero Volatile Organic Compounds (VOC).
Detailed Description
In order to make the technical solutions of the present invention more apparent to those skilled in the art, the following examples are given for illustration. It should be noted that the following examples are not intended to limit the scope of the claimed invention.
Examples 1-6, the components were weighed according to the composition of the powder coating of table 1, then the materials were placed in a blender to mix and crush thoroughly for 5-15min, and then the mixed materials were melt extruded in an extruder at a temperature of 90-105 ℃ in the first zone and 120 ℃ in the second zone, and then the sheets were pressed after melt extrusion, and then the sheets were cooled, crushed, sieved, and passed through a magnetic field at the outlet to remove metal impurities, thus obtaining the powder coating.
TABLE 1 composition of the powder coatings
Comparative example 1
The 50 parts of mica powder in the example 1 is changed into 30 parts, and the rest raw materials and the preparation method are the same as the example 1.
Comparative example 2
The preparation method of the epoxy resin composition is the same as that of example 1 except that 180 parts of bisphenol A epoxy resin in example 1 is changed to 120 parts.
Comparative example 3
The preparation method is the same as that of example 1 except that 20 parts of silane modified epoxy resin in example 1 is changed to 5 parts.
Comparative example 4
1.5 parts of 2-methylimidazole in example 1 is replaced by 5 parts, and the rest of raw materials and the preparation method are the same as those in example 1.
Comparative example 5
11.5 parts of micronized dicyandiamide in example 1 is changed to 4.5 parts, and the rest of raw materials and the preparation method are the same as those in example 1.
Comparative example 6
The temperature of melt extrusion in the preparation process of example 1 was changed from 90-105 ℃ in the first zone to 80 ℃ and from 105-120 ℃ in the second zone to 125 ℃, and the rest of the raw materials and the preparation method were the same as in example 1.
Product effectiveness testing
The powder coatings obtained in the above examples 1-6 and comparative examples 1-6 are respectively sprayed on the ferrite magnetic ring preheated in the oven at 200 ℃ in a high-voltage electrostatic spraying way, the coating thickness is between 200-: 200 ℃ for 5-10 min.
Ferrite magnetic rings coated with the powder coatings obtained in examples 1 to 6 and comparative examples 1 to 6 were subjected to performance tests, respectively:
wherein, the adhesive force is tested according to GB/T9286; impact resistance was tested according to GB/T1732; neutral salt spray was tested according to GB/T1771-2007; apparent density was tested according to GB/T6554-2003; the breakdown strength (normal temperature) is tested according to GB/T6554-2003; the insulation rating was tested according to GB/T11021-2007.
The following tests were also performed on the ferrite bead:
(1) testing at 5000V;
(2) after baking at 155 ℃ for 400 hours, the test was carried out at 5000 volts;
(3) respectively soaking in acetone for 2 hours, butanone for 4 hours and xylene for 24 hours;
(4) soaking in 10% NaOH solution for 10 days;
(5) the mixture was immersed in a 10% hydrochloric acid solution for 10 days.
The results of the performance tests of examples 1-6 are shown in Table 2, and the results of the performance tests of comparative examples 1-6 are shown in Table 3.
Table 2 examples 1-6 performance test results
Wherein, the insulation grade is divided into A, E, B, F, H, 5 grades: the grade A insulating temperature resistance is 105 ℃; e-grade insulating temperature resistance is 120 ℃; the B-level insulation temperature resistance is 130 ℃; the F-level insulation temperature resistance is 155 ℃; h-level insulation temperature resistance is 180 ℃.
TABLE 3 comparative examples 1-6 Performance test results
As can be seen from the comparison of tables 2 and 3, the ferrite magnetic rings of the powder coatings obtained in the spraying examples 1-6 are obviously superior to those of the powder coatings obtained in the comparative examples 1-6, the ferrite magnetic rings of the powder coatings obtained in the spraying examples 1-6 are all F in insulation grade, and the coatings are not broken down under the voltage of 5000V; after being continuously baked for 400 hours at 155 ℃, the coating still does not break down under 5000 volts; the coating does not foam and soften after being soaked in acetone for 2 hours, butanone for 4 hours and xylene for 24 hours; the coating does not generate foaming and softening after being soaked in a 10% NaOH solution for 10 days or in a 10% hydrochloric acid solution for 10 days. The ferrite magnetic rings coated with the powder coatings obtained in examples 1-6 were tested at 5000V or after baking at 155 ℃ for 400 hours, and the coatings were broken down; the coating may be foamed and softened by soaking in acetone for 2 hours, butanone for 4 hours, xylene for 24 hours, or by soaking in a 10% NaOH/HCl solution for 10 days.
Claims (10)
1. The powder coating is characterized by comprising the following components in parts by weight:
2. the powder coating of claim 1, wherein the epoxy resin is a bisphenol a type epoxy resin.
3. The powder coating according to claim 2, wherein the bisphenol A type epoxy resin has an epoxy equivalent of 400-1000 g/eq.
4. The powder coating of claim 1, wherein the modified epoxy resin is a silane modified epoxy resin.
5. The powder coating of claim 1, wherein the filler comprises mica powder.
6. The powder coating according to claim 5, wherein the mica powder is present in an amount of 50-100% by mass of the filler.
7. The powder coating of claim 1, wherein the curing agent is a cyanamide-based compound.
8. The method of preparing a powder coating according to any one of claims 1 to 7, comprising the steps of: weighing the components in proportion, mixing, crushing, melting, extruding, tabletting and crushing to obtain the powder coating.
9. A coating produced by spraying and curing the powder coating material according to any one of claims 1 to 7.
10. An electrical device comprising the coating of claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201911043643.3A CN110760238B (en) | 2019-10-30 | 2019-10-30 | Powder coating and preparation method thereof |
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| CN201911043643.3A CN110760238B (en) | 2019-10-30 | 2019-10-30 | Powder coating and preparation method thereof |
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| CN110760238A true CN110760238A (en) | 2020-02-07 |
| CN110760238B CN110760238B (en) | 2021-09-07 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114058247A (en) * | 2021-11-22 | 2022-02-18 | 擎天材料科技有限公司 | Insulating powder coating and preparation method and application thereof |
| CN116694193A (en) * | 2023-06-05 | 2023-09-05 | 浙江捷宇新材料科技股份有限公司 | High weather-resistant and high chemical corrosion-resistant epoxy powder coating and preparation method thereof |
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| US4639476A (en) * | 1984-06-27 | 1987-01-27 | Nitto Electric Industrial Co., Ltd. | Epoxy resin powder coating composition |
| CN102888175A (en) * | 2011-07-20 | 2013-01-23 | 上海纳米技术及应用国家工程研究中心有限公司 | Surface modification floating bead-containing heat-insulation powdery coating and preparation method thereof |
| CN106398460A (en) * | 2016-08-30 | 2017-02-15 | 天津凯华绝缘材料股份有限公司 | High-weather-resistance and high-flexibility epoxy resin composition and preparation method thereof |
| CN107446116A (en) * | 2017-08-17 | 2017-12-08 | 深圳市深赛尔股份有限公司 | Silicone-modified epoxy resin synthesis and its preparation method of water-based anticorrosive paint |
| CN109321094A (en) * | 2018-09-28 | 2019-02-12 | 上海国丽粉体涂料有限公司 | A kind of powdery paints and application thereof |
-
2019
- 2019-10-30 CN CN201911043643.3A patent/CN110760238B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4639476A (en) * | 1984-06-27 | 1987-01-27 | Nitto Electric Industrial Co., Ltd. | Epoxy resin powder coating composition |
| CN102888175A (en) * | 2011-07-20 | 2013-01-23 | 上海纳米技术及应用国家工程研究中心有限公司 | Surface modification floating bead-containing heat-insulation powdery coating and preparation method thereof |
| CN106398460A (en) * | 2016-08-30 | 2017-02-15 | 天津凯华绝缘材料股份有限公司 | High-weather-resistance and high-flexibility epoxy resin composition and preparation method thereof |
| CN107446116A (en) * | 2017-08-17 | 2017-12-08 | 深圳市深赛尔股份有限公司 | Silicone-modified epoxy resin synthesis and its preparation method of water-based anticorrosive paint |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114058247A (en) * | 2021-11-22 | 2022-02-18 | 擎天材料科技有限公司 | Insulating powder coating and preparation method and application thereof |
| CN116694193A (en) * | 2023-06-05 | 2023-09-05 | 浙江捷宇新材料科技股份有限公司 | High weather-resistant and high chemical corrosion-resistant epoxy powder coating and preparation method thereof |
| CN116694193B (en) * | 2023-06-05 | 2024-01-23 | 浙江捷宇新材料科技股份有限公司 | High weather-resistant and high chemical corrosion-resistant epoxy powder coating and preparation method thereof |
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