CN111876047A - High-temperature-resistant rapid-curing insulating powder coating, preparation method and application method thereof - Google Patents
High-temperature-resistant rapid-curing insulating powder coating, preparation method and application method thereof Download PDFInfo
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Abstract
The invention discloses a high-temperature-resistant rapid-curing insulating powder coating, a preparation method and an application method thereof, wherein an insulating coating formed by crosslinking and curing the high-temperature-resistant rapid-curing insulating powder coating has the advantages of uniform texture, bright and consistent color, better corner coverage rate, excellent high-temperature and low-temperature heat deformation resistance, higher breakdown resistance and higher electrical appliance performance; the method for coating the high-temperature-resistant quick-curing insulating powder on the surface of the motor rotor is simple, avoids placing the motor rotor in an oven for high-temperature drying and curing crosslinking, obviously shortens the curing crosslinking time of the insulating material layer on the surface of a single motor rotor, and effectively improves the production efficiency of coating the insulating material layer on a large-scale motor rotor production line; the preparation method of the high-temperature-resistant fast-curing insulating powder coating has simple operation steps and strong practicability.
Description
Technical Field
The invention relates to the technical field of insulating materials, in particular to a high-temperature-resistant fast-curing insulating powder coating, a preparation method and an application method thereof.
Background
With the continuous development of the micro-motor industry and the continuous expansion of the application field, the requirements on temperature resistance and pressure resistance of the motor rotor are continuously improved. The coating process of the traditional motor rotor surface insulating material comprises the following steps: coating insulating powder coating on the surface of a motor rotor through a semi-automatic coating machine in an electrostatic manner, then inserting the motor on an iron disc, placing the iron disc in an oven, slowly heating to 200 ℃, keeping the temperature for more than one hour, opening the oven to reduce the temperature to a certain value, turning the motor in the oven up and down once, heating to 200 ℃ again, keeping the temperature for about one hour, solidifying the insulating powder to form an insulating material coating, cooling again, and taking out the iron disc loaded with the motor.
The coating process of the insulating material of the motor rotor is complex, the production period is long, and labor and energy consumption are seriously wasted; in addition, the motor coated with the insulating material coating is turned over and moved, so that collision is caused, coated powder falls off, and the corner is exposed, and more products are scrapped. Although the oven is provided with the air blower, the temperature difference between the upper end and the lower end in the oven is more than 10 ℃ under the condition that the motor rotor is filled, so that the motor rotor at the upper end and the lower end in the oven is inconsistent in color depth, and excessive baking can also cause blackening and carbonization of a coating, thereby seriously affecting the quality and the appearance of a product.
Along with the requirement of market development, customers have strict requirements on the insulating property of an insulating material layer on the outer surface of a motor rotor and the temperature resistance, voltage resistance, appearance and the like of the rotor, so that the development of a high-temperature-resistant, voltage-resistant and fast-curing insulating powder coating is imperative.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a high-temperature-resistant rapid-curing insulating powder coating, a preparation method and an application method, wherein an insulating coating formed by crosslinking and curing the high-temperature-resistant rapid-curing insulating powder coating has the advantages of uniform texture, bright and consistent color, better corner coverage, excellent high-temperature and low-temperature heat deformation resistance, higher breakdown resistance and electrical appliance performance; the method for coating the high-temperature-resistant quick-curing insulating powder on the surface of the motor rotor is simple, avoids placing the motor rotor in an oven for high-temperature drying and curing crosslinking, obviously shortens the curing crosslinking time of the insulating material layer on the surface of a single motor rotor, and effectively improves the production efficiency of coating the insulating material layer on a large-scale motor rotor production line; the preparation method of the high-temperature-resistant fast-curing insulating powder coating has simple operation steps and strong practicability.
In order to achieve the purpose, the technical scheme of the invention is to design a high-temperature-resistant and fast-curing insulating powder coating, which comprises the following raw materials in parts by weight:
20-30 parts of bisphenol A solid epoxy resin, 10-25 parts of o-cresol modified epoxy resin, 5-15 parts of curing agent, 5-10 parts of low-temperature cross-linking agent, 0-30 parts of filler, 0.5-2 parts of accelerator and 30-40 parts of auxiliary agent, wherein the curing agent is one of dicyandiamide or anhydride, and the accelerator is dimethyl imidazole or imidazole derivative.
The preferable technical scheme is that 25 parts of bisphenol A solid epoxy resin, 13 parts of o-cresol modified epoxy resin, 5-15 parts of curing agent, 8 parts of low-temperature cross-linking agent, 5-15 parts of filler, 1-1.5 parts of accelerator and 35 parts of auxiliary agent, wherein the curing agent is ultrafine dicyandiamide, and the accelerator is a dimethyl imidazole derivative.
Further preferably, the auxiliary agent comprises a leveling agent, a flame retardant, a pigment, a thixotropic agent and a defoaming agent, and the weight ratio of the leveling agent to the flame retardant to the pigment to the thixotropic agent is 1: 2.5: 0.7: 0.8: 0.5.
Further preferably, the insulating powder coating further comprises a non-reactive flame retardant, wherein the non-reactive flame retardant is one or more of ammonium polyphosphate, phosphate, aluminum hydroxide, magnesium hydroxide and zinc borate.
In order to ensure the smooth preparation and application implementation of the high-temperature-resistant fast-curing insulating powder coating, a preparation method of the high-temperature-resistant fast-curing insulating powder coating is provided, and comprises the following steps:
s1: crushing and mixing, namely weighing the raw materials according to the weight component ratio, putting the raw materials into a high-speed mixing tank, and crushing the raw materials at a high speed of 500-1500 rpm for 5-10 min to obtain mixed raw material components;
s2: melt-mixing, placing the mixed raw material components prepared in the step S1 in a screw extruder to heat and melt and mix uniformly to form a fluid mixture;
s3: crushing: and (4) tabletting and cooling the fluid mixture prepared in the step S2 in sequence to form a flaky solid matter, and then crushing and performing secondary cyclone separation on the flaky solid matter in sequence to obtain the high-temperature-resistant fast-curing insulating powder coating.
The invention also provides a method for applying the high-temperature-resistant quick-curing insulating powder coating, which comprises the following steps:
w1: electrostatic spraying, namely electrostatically adsorbing the insulating powder coating to the surface of the motor rotor in an electrostatic spraying manner;
w2: and (3) heating and curing, namely placing the motor rotor coated with the insulating powder coating in the step W1 into a high-frequency heating device, and reacting and curing the insulating powder coating by electromagnetic high-frequency heating to adhere to the surface of the motor rotor.
Preferably, in the step W2, the motor rotor coated with the insulating powder coating in the step W1 is subjected to electromagnetic high-frequency heating twice in a high-frequency heating device, wherein the first electromagnetic high-frequency heating temperature is 160 to 180 ℃ and the heating time is 20 to 30s, and the second electromagnetic high-frequency heating temperature is 200 to 230 ℃ and the heating time is 20 to 30 s.
The invention has the advantages and beneficial effects that:
the insulating coating formed by crosslinking and curing the high-temperature-resistant fast-curing insulating powder coating has the advantages of uniform texture, bright and consistent color, better corner coverage rate, excellent high-temperature and low-temperature-resistant thermal deformation resistance, higher breakdown resistance and higher electrical appliance performance; the method for coating the high-temperature-resistant quick-curing insulating powder on the surface of the motor rotor is simple, avoids placing the motor rotor in an oven for high-temperature drying and curing crosslinking, obviously shortens the curing crosslinking time of the insulating material layer on the surface of a single motor rotor, and effectively improves the production efficiency of coating the insulating material layer on a large-scale motor rotor production line; the preparation method of the high-temperature-resistant fast-curing insulating powder coating has simple operation steps and strong practicability.
Detailed Description
The following further describes embodiments of the present invention with reference to examples. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
Example 1
The high-temperature-resistant rapid-curing insulating powder coating comprises the following raw materials in parts by weight:
20 parts of bisphenol A solid epoxy resin, 10 parts of o-cresol modified epoxy resin, 15 parts of curing agent, 5 parts of low-temperature cross-linking agent, 18 parts of filler, 2 parts of accelerator and 30 parts of auxiliary agent, wherein the curing agent is ultrafine dicyandiamide, and the accelerator is a dimethyl imidazole derivative.
Preferably, the auxiliary agent comprises a leveling agent, a flame retardant, a pigment, a thixotropic agent and an antifoaming agent, and the weight ratio of the leveling agent to the flame retardant to the thixotropic agent is 1: 2.5: 0.7: 0.8: 0.5; the insulating powder coating also comprises a non-reactive flame retardant, wherein the non-reactive flame retardant is ammonium polyphosphate, phosphate and aluminum hydroxide, and the weight ratio of the ammonium polyphosphate to the phosphate to the aluminum hydroxide is 1: 1.
The preparation method of the high-temperature-resistant rapid-curing insulating powder coating comprises the following steps:
s1: crushing and mixing, namely weighing the raw materials according to the weight component ratio, putting the raw materials into a high-speed mixing tank, and crushing the raw materials at a high speed of 500-1500 rpm for 5-10 min to obtain mixed raw material components;
s2: melt-mixing, placing the mixed raw material components prepared in the step S1 in a screw extruder to heat and melt and mix uniformly to form a fluid mixture;
s3: crushing: and (4) tabletting and cooling the fluid mixture prepared in the step S2 in sequence to form a flaky solid matter, and then crushing and performing secondary cyclone separation on the flaky solid matter in sequence to obtain the high-temperature-resistant fast-curing insulating powder coating.
Example 2
The high-temperature-resistant rapid-curing insulating powder coating comprises the following raw materials in parts by weight:
25 parts of bisphenol A solid epoxy resin, 13 parts of o-cresol modified epoxy resin, 12 parts of curing agent, 10 parts of low-temperature cross-linking agent, 4 parts of filler, 1 part of accelerator and 35 parts of auxiliary agent, wherein the curing agent is phthalic anhydride, and the accelerator is a dimethyl imidazole derivative.
Preferably, the auxiliary agent comprises a leveling agent, a flame retardant, a pigment, a thixotropic agent and an antifoaming agent, and the weight ratio of the leveling agent to the flame retardant to the thixotropic agent is 1: 2.5: 0.7: 0.8: 0.5; the insulating powder coating also comprises a non-reactive flame retardant, wherein the non-reactive flame retardant is ammonium polyphosphate, phosphate and aluminum hydroxide, and the weight ratio of the ammonium polyphosphate to the phosphate to the aluminum hydroxide is 1: 1.
The preparation method of the high temperature resistant fast curing insulating powder coating is the same as that of example 1.
Example 3
The high-temperature-resistant rapid-curing insulating powder coating comprises the following raw materials in parts by weight:
30 parts of bisphenol A solid epoxy resin, 15 parts of o-cresol modified epoxy resin, 15 parts of curing agent, 5 parts of low-temperature cross-linking agent, 0 part of filler, 0.5 part of accelerator and 40 parts of auxiliary agent, wherein the curing agent is phthalic anhydride, and the accelerator is a dimethyl imidazole derivative.
Preferably, the auxiliary agent comprises a leveling agent, a flame retardant, a pigment, a thixotropic agent and an antifoaming agent, and the weight ratio of the leveling agent to the flame retardant to the thixotropic agent is 1: 2.5: 0.7: 0.8: 0.5; the insulating powder coating also comprises a non-reactive flame retardant, wherein the non-reactive flame retardant is ammonium polyphosphate, aluminum hydroxide, magnesium hydroxide and zinc borate, and the weight ratio of the ammonium polyphosphate to the aluminum hydroxide to the magnesium hydroxide to the zinc borate is 1: 1.
The preparation method of the high temperature resistant fast curing insulating powder coating is the same as that of example 1.
The method for applying the high-temperature-resistant rapid-curing insulating powder coating prepared in the embodiments 1 to 3 to the surface of the motor rotor respectively comprises the following steps:
w1: electrostatic spraying, namely respectively and electrostatically adsorbing the high-temperature-resistant and rapidly-cured insulating powder coatings prepared in the embodiments 1 to 3 to the surface of a motor rotor through a high-voltage electrostatic fluidized bed;
w2: and (3) heating and curing, namely placing the motor rotor coated with the insulating powder coating in the step W1 into a high-frequency heating device, and reacting and curing the insulating powder coating by electromagnetic high-frequency heating to adhere to the surface of the motor rotor.
Preferably, in the step W2, the motor rotor coated with the insulating powder coating in the step W1 is subjected to electromagnetic high-frequency heating twice in a high-frequency heating device, wherein the first electromagnetic high-frequency heating temperature is 160 to 180 ℃ and the heating time is 20 to 30s, and the second electromagnetic high-frequency heating temperature is 200 to 230 ℃ and the heating time is 20 to 30 s.
Then, the motor rotor finished products corresponding to the high-temperature-resistant fast-curing insulating powder coatings prepared in examples 1 to 3 were subjected to related performance tests, and the test results are shown in table 1.
TABLE 1 Performance test results for finished Motor rotors
As can be seen from table 1, the finished product of the motor rotor corresponding to the high-temperature-resistant fast-curing insulating powder coating prepared in the embodiments 1 to 3 has the characteristics of excellent insulating property, flame retardant property, neutral salt spray resistance, heat resistance and the like, and replaces the traditional insulating thermal shrinkable sleeve product to be applied to the insulating protective coating of the motor rotor, so that the key properties of insulation and flame retardance are improved; the coating method of the high-temperature-resistant rapid-curing insulating powder disclosed by the invention has simple operation steps, avoids placing the motor rotor in an oven for high-temperature drying and curing crosslinking, obviously shortens the curing crosslinking time of the insulating material layer on the surface of a single motor rotor, and effectively improves the production efficiency of coating the insulating material layer on a large-scale motor rotor production line.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the technical principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (7)
1. The high-temperature-resistant rapid-curing insulating powder coating is characterized by comprising the following raw materials in parts by weight:
20-30 parts of bisphenol A solid epoxy resin, 10-25 parts of o-cresol modified epoxy resin, 5-15 parts of curing agent, 5-10 parts of low-temperature cross-linking agent, 0-30 parts of filler, 0.5-2 parts of accelerator and 30-40 parts of auxiliary agent, wherein the curing agent is one of dicyandiamide or anhydride, and the accelerator is dimethyl imidazole or imidazole derivative.
2. The high temperature resistant, fast curing and insulating powder coating according to claim 1, wherein the bisphenol a solid epoxy resin comprises 25 parts, 13 parts, 5-15 parts, 8 parts, 5-15 parts, 1-1.5 parts and 35 parts of an auxiliary agent, the curing agent is ultrafine dicyandiamide, and the accelerator is a dimethyl imidazole derivative.
3. The high temperature resistant, fast curing insulating powder coating according to claim 2, wherein the auxiliaries comprise leveling agents, flame retardants, pigments, thixotropic agents and defoamers in a weight ratio of 1: 2.5: 0.7: 0.8: 0.5.
4. The high temperature resistant, fast curing insulating powder coating of claim 3, further comprising a non-reactive flame retardant, wherein the non-reactive flame retardant is one or more of ammonium polyphosphate, phosphate, aluminum hydroxide, magnesium hydroxide, zinc borate.
5. A preparation method of the high-temperature-resistant fast-curing insulating powder coating as claimed in any one of claims 1 to 4, characterized by comprising the following steps:
s1: crushing and mixing, namely weighing the raw materials according to the weight component ratio, putting the raw materials into a high-speed mixing tank, and crushing the raw materials at a high speed of 500-1500 rpm for 5-10 min to obtain mixed raw material components;
s2: melt-mixing, placing the mixed raw material components prepared in the step S1 in a screw extruder to heat and melt and mix uniformly to form a fluid mixture;
s3: crushing: and (4) tabletting and cooling the fluid mixture prepared in the step S2 in sequence to form a flaky solid matter, and then crushing and performing secondary cyclone separation on the flaky solid matter in sequence to obtain the high-temperature-resistant fast-curing insulating powder coating.
6. A method for applying the high temperature fast curing insulating powder coating according to any one of claims 1 to 4, characterized by comprising the following steps:
w1: electrostatic spraying, namely electrostatically adsorbing the insulating powder coating to the surface of the motor rotor in an electrostatic spraying manner;
w2: and (3) heating and curing, namely placing the motor rotor coated with the insulating powder coating in the step W1 into a high-frequency heating device, and reacting and curing the insulating powder coating by electromagnetic high-frequency heating to adhere to the surface of the motor rotor.
7. The method of applying a high temperature fast curing insulating powder coating according to claim 6, wherein in the step W2, the rotor of the motor coated with the insulating powder coating of the step W1 is subjected to electromagnetic high frequency heating twice in a high frequency heating apparatus, wherein the first electromagnetic high frequency heating temperature is 160 to 180 ℃ and the heating time is 20 to 30s, and the second electromagnetic high frequency heating temperature is 200 to 230 ℃ and the heating time is 20 to 30 s.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114456679A (en) * | 2021-12-31 | 2022-05-10 | 江南载福粉末涂料（张家港）有限公司 | High-corner-coverage-rate powder coating and preparation method thereof |
| CN115466553A (en) * | 2022-09-01 | 2022-12-13 | 深圳市锦旺兴绝缘材料有限公司 | Process for quickly curing insulating epoxy powder coating |
Citations (10)
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