CN115746672B - Amorphous dip-coating insulating powder coating and preparation method thereof - Google Patents
Amorphous dip-coating insulating powder coating and preparation method thereof Download PDFInfo
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Abstract
The invention discloses an amorphous dip-coating insulating powder coating and a preparation method thereof, belonging to the field of coatings, wherein the amorphous dip-coating insulating powder coating comprises the following components: epoxy resin, alkyl phenolic resin and curing agent; the curing agent comprises a dicyandiamide curing agent, a phenolic curing agent, or a combination thereof. The invention provides an amorphous dip-coating insulating powder coating which can be used for preparing a coating of an amorphous magnetic ring, has the characteristics of low-temperature rapid solidification, strong impact strength, breakdown strength, insulating property, flame retardant property, double-eight-five damp heat resistance, high-low temperature impact resistance and the like, and can be applied to a fluidized bed dip-coating mode for coating unlike the traditional coating mode, and compared with the traditional electrostatic spraying, the coating mode of the powder coating is more cost-saving and energy consumption-reducing.
Description
Technical Field
The invention belongs to the field of coatings, and particularly relates to an amorphous dip-coating insulating powder coating and a preparation method thereof.
Background
The magnetic amorphous material is an important basic functional material, has the functions of converting, transmitting, processing, storing information, energy and the like, has wide application range, and has irreplaceable requirements in the fields of electroacoustic, mineral separation, energy, household appliances, medical and health, automobiles, automatic control, information technology and the like.
Meanwhile, the magnetic amorphous material is used as a clean energy source, is widely and gradually applied to the fields of military national defense such as robots, unmanned aerial vehicles, aerospace and satellite remote sensing in the emerging fields such as energy conservation and environmental protection, new energy sources, electric vehicles, smart cities, smart earth and the like, and accords with the current national advocated energy conservation and environmental protection and green development directions.
The powder coating has the characteristics of low pollution, almost zero VOC emission and the like, gradually becomes the selection direction of magnetic amorphous material enterprises, and changes the paint into powder into the development trend of the coating related industry. However, at present, no amorphous dip-coating insulating powder with the characteristics of low-temperature rapid solidification, strong impact strength, breakdown strength, insulating property, flame retardant property, double-eighth-fifth damp heat resistance, high-low temperature impact resistance and the like exists, and the traditional powder coating is mainly coated by adopting electrostatic spraying, so that the method has high cost and high energy consumption.
Disclosure of Invention
In order to overcome the problems in the prior art, one of the purposes of the invention is to provide an amorphous dip-coating insulating powder coating, which has the characteristics of low-temperature rapid curing, strong impact strength, breakdown strength, insulating property, flame retardant property, double-eight-five damp heat resistance, high-low temperature impact resistance and the like.
The second purpose of the invention is to provide a preparation method of the amorphous dip-coating insulating powder coating.
It is a further object of the present invention to provide a coating formed from an insulating powder coating comprising the above-described amorphous dip coating.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
The first aspect of the invention provides an amorphous dip-coated insulating powder coating comprising the following components: epoxy resin, alkyl phenolic resin, curing agent, including dicyandiamide curing agent, phenolic curing agent, or combinations thereof.
Preferably, the amorphous dip-coating insulating powder coating comprises the following components in parts by mass: 120-350 parts of epoxy resin, 7-140 parts of alkyl phenolic resin and 10-120 parts of curing agent.
Preferably, the powder coating further comprises 50-350 parts of filler; more preferably, the powder coating further comprises 100 to 300 parts of filler; still preferably, the powder coating further comprises 100 to 150 parts of filler.
Preferably, the filler is at least one of barium sulfate, silica micropowder, mica powder, titanium dioxide, talcum powder or feldspar powder; more preferably, the filler is at least one of JM-20 silica micropowder, JS-18 silica micropowder, silica micropowder FY-1 and GT-5 mica powder.
Preferably, the powder coating further comprises 0.1-15 parts of an accelerator; more preferably, the powder coating further comprises 1 to 10 parts of an accelerator.
Preferably, the accelerator is an imidazole accelerator; more preferably, the imidazole accelerator is at least one of 2-phenylimidazole, 2-ethylimidazole, 2, 4-dimethylimidazole, 2-methylimidazole, imidazole epoxy adduct or imidazole isocyanate adduct; still preferably, the imidazole accelerator is at least one of 2-phenylimidazole, 2-ethylimidazole or2, 4-dimethylimidazole.
Preferably, the powder coating further comprises an auxiliary agent, wherein the auxiliary agent is at least one of an antioxidant, a leveling agent, a degassing agent and a colorant.
Preferably, the antioxidant comprises at least one of antioxidant 168, antioxidant 3114, antioxidant DLTDP, antioxidant 1010 and antioxidant 1076.
Preferably, the leveling agent comprises an acrylate leveling agent.
Preferably, the degasifying agent comprises at least one of benzoin, breathable wax, polyether; more preferably, the breathable wax comprises at least one of micronized modified polyethylene wax, polypropylene wax, polytetrafluoroethylene wax.
Preferably, the colorant is at least one of iron oxide red, iron oxide yellow, carbon black, ultramarine, iron yellow, phthalocyanine blue and phthalocyanine green.
Preferably, in the amorphous dip-coating insulating powder coating, the mass part of the epoxy resin is 150-300 parts; more preferably, in the amorphous dip-coating insulating powder coating, the mass part of the epoxy resin is 170 to 230 parts.
Preferably, the epoxy equivalent of the epoxy resin is 400-850 g/eq; more preferably, the epoxy resin has an epoxy equivalent of 570-780 g/eq; still more preferably, the epoxy resin has an epoxy equivalent of 600 to 750g/eq.
Preferably, the epoxy resin has a melt viscosity of 550 to 950cps at 150 ℃; more preferably, the epoxy resin has a melt viscosity of 600 to 900cps at 150 ℃.
Preferably, the softening point of the epoxy resin is 70-100 ℃; more preferably, the softening point of the epoxy resin is 80 to 110 ℃.
Preferably, the epoxy resin is at least one of bisphenol a epoxy resin, bisphenol F epoxy resin, polyphenol type glycidyl ether epoxy resin or aliphatic glycidyl ether epoxy resin; more preferably, the epoxy resin is a bisphenol a type epoxy resin, a bisphenol F type epoxy resin, or a combination thereof.
Preferably, in the amorphous dip-coating insulating powder coating, the mass part of the alkyl phenolic resin is 10-120 parts; more preferably, in the amorphous dip-coating insulating powder coating, the mass part of the alkylphenol resin is 30 to 80 parts.
Preferably, the epoxy equivalent of the alkyl phenolic resin is 350-500 g/eq; more preferably, the epoxy equivalent of the alkylphenol resin is 400 to 450g/eq.
Preferably, the alkyl phenol-formaldehyde resin is a reactive alkyl phenol-formaldehyde resin; more preferably, the alkyl phenol-formaldehyde resin is a thermally reactive alkyl phenol-formaldehyde resin.
Preferably, the alkyl phenol resin is alkyl phenol resin FRJ551, alkyl phenol resin 134, or a combination thereof.
Preferably, in the amorphous dip-coating insulating powder coating, the mass part of the curing agent is 15-95 parts; more preferably, in the amorphous dip-coating insulating powder coating, the mass part of the curing agent is 20 to 55 parts.
Preferably, the curing agent is a dicyandiamide curing agent, a phenolic curing agent or a combination thereof; more preferably, the curing agent is a mixture of dicyandiamide curing agent and phenolic curing agent.
Preferably, in the amorphous dip-coating insulating powder coating, the dicyandiamide curing agent is 2-50 parts by mass; more preferably, in the amorphous dip-coating insulating powder coating, the dicyandiamide curing agent is 5-35 parts by mass.
Preferably, the dicyandiamide curing agent has a hydroxyl value of 0.4 to 1.2eq/100g; more preferably, the dicyandiamide curing agent has a hydroxyl value of 0.6 to 0.96eq/100g.
Preferably, the dicyandiamide curing agent is at least one of a CA-120 curing agent, a DM-1 curing agent and an SA-89 curing agent.
Preferably, in the amorphous dip-coating insulating powder coating, the mass part of the phenolic curing agent is 5-70; more preferably, in the amorphous dip-coating insulating powder coating, the mass part of the phenolic curing agent is 10 to 60 parts.
Preferably, the equivalent weight of the phenolic curing agent is 350-650 g/eq; more preferably, the equivalent weight of the phenolic curing agent is 400 to 600g/eq.
Preferably, the specific gravity of the phenolic curing agent is 7-65; more preferably, the specific gravity of the phenolic curing agent is 10 to 60.
Preferably, the softening point of the phenolic curing agent is 110-135 ℃; more preferably, the softening point of the phenolic curing agent is 120 to 125 ℃.
Preferably, the phenolic curing agent is a phenolic curing agent.
Preferably, the mass ratio of the epoxy resin to the alkyl phenolic resin to the dicyandiamide curing agent to the phenolic curing agent is 200: (20-100): (10-50): (10-50).
Preferably, the amorphous dip-coating insulating powder coating comprises the following components in parts by mass: 120-350 parts of epoxy resin, 7-140 parts of alkyl phenolic resin, 2-50 parts of dicyandiamide curing agent, 8-70 parts of phenolic curing agent, 80-350 parts of filler and 0.1-15 parts of accelerator;
More preferably, the amorphous dip-coating insulating powder coating comprises the following components in parts by mass: 150-300 parts of epoxy resin, 10-120 parts of alkyl phenolic resin, 5-35 parts of dicyandiamide curing agent, 10-60 parts of phenolic curing agent, 100-300 parts of filler and 1-10 parts of accelerator.
A second aspect of the present invention provides a method for preparing the amorphous dip-coating insulating powder coating according to the first aspect of the present invention, comprising the steps of: mixing the components, extruding, and pulverizing to obtain the amorphous dip-coating insulating powder coating.
Preferably, in the preparation method of the powder coating, the components are crushed during mixing, and the crushing is a technical means conventional in the field.
Preferably, in the method for producing a powder coating, the extrusion is performed using a twin screw extruder.
Preferably, the heating temperature of the extruder is 80-120 ℃; more preferably, the heating temperature of the extruder is 90 to 110 ℃.
Preferably, the D50 particle size of the amorphous dip-coating insulating powder coating is 25-45 mu m; more preferably, the D50 particle size of the amorphous dip-coated insulating powder coating is 30-40 μm.
A third aspect of the invention provides a coating formed from an amorphous dip-coated insulating powder coating comprising the first aspect of the invention.
Preferably, the coating is an amorphous magnetic coil coating.
The beneficial effects of the invention are as follows:
The invention provides an amorphous dip-coating insulating powder coating which can be used for preparing a coating of an amorphous magnetic ring, has the characteristics of low-temperature rapid solidification, strong impact strength, breakdown strength, insulating property, flame retardant property, double-eight-five damp heat resistance, high-low temperature impact resistance and the like, and can be applied to a fluidized bed dip-coating mode for coating unlike the traditional coating mode, and compared with the traditional electrostatic spraying, the coating mode of the powder coating is more cost-saving and energy consumption-reducing.
In particular, compared with the prior art, the invention has the following advantages:
The amorphous dip-coating insulating powder coating disclosed by the invention adopts the epoxy resin and the alkyl phenolic resin, has excellent compatibility with dicyandiamide curing agent and phenolic curing agent molecular groups, has basically similar characteristics and good machining performance, can be fully and uniformly mixed with the curing agent so as to achieve uniformity of a coating film in a curing reaction, ensure good impact strength, breakdown strength, insulating performance, flame retardance, double-eighth-fifth damp heat resistance, high-low temperature impact resistance and the like, has the curing temperature of 160 ℃/5min, can be suitable for a coating mode of fluidized bed dip-coating, and has more obvious energy-saving and emission-reducing benefits compared with the traditional electrostatic spray coating.
Detailed Description
The present invention will be described in further detail with reference to specific examples. It is also to be understood that the following examples are given solely for the purpose of illustration and are not to be construed as limitations on the scope of the invention, since various modifications and adaptations may be made by those skilled in the art in light of the teachings herein. The specific process parameters and the like described below are also merely examples of suitable ranges, i.e., one skilled in the art can make a selection within the suitable ranges by the description herein and are not intended to be limited to the specific data described below. The starting materials, reagents or apparatus used in the examples and comparative examples were either commercially available from conventional sources or may be obtained by prior art methods unless specifically indicated.
The alkylphenol resin used in the examples of the present invention was holly phenol resin 551, and the phenolic curing agent was d.e.h.85.
Example 1
An amorphous dip-coating insulating powder coating is prepared from the following components in parts by mass:
Wherein the epoxy equivalent of the epoxy resin is 650-670 g/eq; the hydroxyl value of the dicyandiamide curing agent is 0.6 to 0.65eq/100g; the softening point of the phenolic curing agent is 120 ℃.
The preparation method of the amorphous dip-coating insulating powder coating comprises the following steps:
(1) Weighing the epoxy resin with the epoxy equivalent of 650-670 g/eq, the CA-120 dicyandiamide curing agent, the phenolic curing agent, the 2-phenylimidazole accelerator and the silicon micro powder JM-20 according to the proportion, placing the materials into a mixing cylinder, fully mixing and crushing for 1-10 minutes;
(2) Extruding the crushed material in a double-screw extruder at 90-110 deg.c;
(3) The extruded material is crushed into powder with the particle diameter (equivalent particle diameter D50) of 30-40 mu m by a tabletting, cooling and crushing machine, and then the powder is sieved to obtain the amorphous dip-coating insulating powder coating.
Example 2
An amorphous dip-coating insulating powder coating is prepared from the following components in parts by mass:
Wherein the epoxy equivalent of the epoxy resin is 650-670 g/eq; the hydroxyl value of the dicyandiamide curing agent is 0.8-0.9 eq/100g; the softening point of the phenolic curing agent is 120 ℃.
The preparation method of the amorphous dip-coating insulating powder coating comprises the following steps:
(1) Weighing epoxy resin with the epoxy equivalent of 650-670 g/eq, DM-1 dicyandiamide curing agent, phenol curing agent, 2, 4-dimethyl imidazole accelerator and silicon micropowder FR-10 according to a proportion, placing the materials in a mixing cylinder, fully mixing and crushing for 1-10 minutes;
(2) Extruding the crushed material in a double-screw extruder at 90-110 deg.c;
(3) The extruded material is crushed into powder with the particle diameter (equivalent particle diameter D50) of 30-40 mu m by a tabletting, cooling and crushing machine, and then the powder is sieved to obtain the amorphous dip-coating insulating powder coating.
Example 3
An amorphous dip-coating insulating powder coating is prepared from the following components in parts by mass:
wherein the epoxy equivalent of the epoxy resin is 650-670 g/eq; the hydroxyl value of the dicyandiamide curing agent is 0.9-0.96 eq/100g; the softening point of the phenolic curing agent is 120 ℃.
The preparation method of the amorphous dip-coating insulating powder coating comprises the following steps:
(1) Weighing epoxy resin with the epoxy equivalent of 650-670 g/eq, SA-89 dicyandiamide curing agent, phenolic curing agent, 2-ethylimidazole accelerator and mica powder GT-5 according to a proportion, placing the materials in a mixing cylinder, fully mixing and crushing for 1-10 minutes;
(2) Extruding the crushed material in a double-screw extruder at 90-110 deg.c;
(3) The extruded material is crushed into powder with the particle diameter (equivalent particle diameter D50) of 30-40 mu m by a tabletting, cooling and crushing machine, and then the powder is sieved to obtain the amorphous dip-coating insulating powder coating.
Example 4
An amorphous dip-coating insulating powder coating is prepared from the following components in parts by mass:
Wherein the epoxy equivalent of the epoxy resin is 650-670 g/eq; the hydroxyl value of the dicyandiamide curing agent is 0.9-0.96 eq/100g; the softening point of the phenolic curing agent is 112 ℃.
The preparation method of the amorphous dip-coating insulating powder coating comprises the following steps:
(1) Weighing epoxy resin with the epoxy equivalent of 650-670 g/eq, SA-89 dicyandiamide curing agent, 2-ethylimidazole accelerator and mica powder GT-5 according to a proportion, placing the materials in a mixing cylinder, fully mixing and crushing for 1-10 minutes;
(2) Extruding the crushed material in a double-screw extruder at 90-110 deg.c;
(3) The extruded material is crushed into powder with the particle diameter (equivalent particle diameter D50) of 30-40 mu m by a tabletting, cooling and crushing machine, and then the powder is sieved to obtain the amorphous dip-coating insulating powder coating.
Comparative example 1
An amorphous dip-coating insulating powder coating is prepared from the following components in parts by mass:
Wherein the epoxy equivalent of the epoxy resin is 400-550 g/eq; the hydroxyl value of the dicyandiamide curing agent is 0.6 to 0.65eq/100g; the softening point of the phenolic curing agent is 120 ℃.
The preparation method of the amorphous dip-coating insulating powder coating comprises the following steps:
(1) Weighing epoxy resin with the epoxy equivalent of 400-550 g/eq, CA-120 dicyandiamide curing agent, phenolic curing agent, 2-phenylimidazole accelerator and silicon micro powder JM-20 according to a proportion, placing the materials into a mixing cylinder, fully mixing and crushing for 1-10 minutes;
(2) Extruding the crushed material in a double-screw extruder at 90-110 deg.c;
(3) The extruded material is crushed into powder with the particle diameter (equivalent particle diameter D50) of 30-40 mu m by a tabletting, cooling and crushing machine, and then the powder is sieved to obtain the amorphous dip-coating insulating powder coating.
The amorphous dip-coated insulating powder coatings prepared in examples 1 to 4 and comparative example 1 were subjected to performance tests according to the relevant test contents and standards described in table 1, and the test results are recorded in table 2.
Table 1 test contents and criteria relating to amorphous dip-coating of insulating powder coatings
Table 2 results of performance tests of examples 1 to 4 and comparative example 1
The coatings prepared in examples 1 to 4 were flat, were completely cured after being dip-coated in a fluidized bed and taken out, and as can be seen from table 2, the comprehensive properties of examples 1 to 4 are superior to those of comparative example 1, and the properties of impact strength, breakdown strength, volume resistivity, water content, flame retardant property, halogen content, chemical property, high and low temperature impact resistance, double 85 aging and the like can meet the requirements of normal operation of the amorphous magnetic coil, so that the coating is an ideal amorphous dip-coated insulating powder coating. The powder coatings of examples 1 to 3 also have higher inductance strength, and obviously better breakdown strength and high-low temperature impact resistance. In addition, the curing temperature of the powder coating of examples 1 to 4 is 160 ℃/5min, and the powder coating can be applied to the coating by a fluidized bed dip coating method, and compared with the traditional electrostatic spraying, the powder coating method has the advantages of saving cost and reducing energy consumption.
The coating prepared by adopting the amorphous dip-coating insulating powder coating has the advantages of strong impact strength, breakdown strength, volume resistivity, flame retardant property, halogen content, chemical property, high-low temperature impact, double-85 aging and the like, and can be used as an amorphous magnetic coil coating with excellent performance.
While the embodiments of the present invention have been described in detail with reference to the specific embodiments, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art. Furthermore, embodiments of the invention and features of the embodiments may be combined with each other without conflict.
Claims (4)
1. An amorphous coil coating, wherein the coating is formed from an amorphous dip-coated insulating powder coating comprising the following components: epoxy resin, alkyl phenolic resin and curing agent; the mass ratio of the epoxy resin to the alkyl phenolic resin to the dicyandiamide curing agent to the phenolic curing agent is 200: (20-100): (10-50): (10-50);
The powder coating also comprises the following components in parts by mass: 100-150 parts of filler and 0.1-15 parts of accelerator;
the curing agent is a mixture of dicyandiamide curing agent and phenolic curing agent; the equivalent weight of the phenolic curing agent is 350-650 g/eq; the specific gravity of the phenolic curing agent is 7-65; the softening point of the phenolic curing agent is 120-125 ℃;
the alkyl phenolic resin is alkyl phenolic resin FRJ551.
2. The amorphous magnetic coil coating of claim 1 wherein the powder coating further includes an auxiliary agent including at least one of an antioxidant, a leveling agent, a deaerating agent, and a colorant.
3. The amorphous magnetic coil coating of claim 1, wherein the epoxy meets at least one of the following requirements:
The epoxy equivalent of the epoxy resin is 400-850 g/eq;
the melt viscosity of the epoxy resin is 550-950 cps at 150 ℃;
the softening point of the epoxy resin is 70-100 ℃.
4. The amorphous magnetic coil coating of claim 1, wherein the dicyandiamide curing agent has a hydroxyl value of 0.4 to 1.2eq/100g.
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| CN109321015A (en) * | 2018-09-30 | 2019-02-12 | 清远道顿新材料有限公司 | A kind of power transmission and distribution busbar special isolation powdery paints and preparation method thereof |
| CN112375454A (en) * | 2020-10-20 | 2021-02-19 | 擎天材料科技有限公司 | Insulating powder coating and preparation method thereof |
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