CN114574073A - Low-temperature fast-curing insulating powder coating and preparation method and application thereof - Google Patents
Low-temperature fast-curing insulating powder coating and preparation method and application thereof Download PDFInfo
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- CN114574073A CN114574073A CN202210364312.5A CN202210364312A CN114574073A CN 114574073 A CN114574073 A CN 114574073A CN 202210364312 A CN202210364312 A CN 202210364312A CN 114574073 A CN114574073 A CN 114574073A
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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
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- 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
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- 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
- C08G59/4035—Hydrazines; Hydrazides
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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
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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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/60—Additives non-macromolecular
- C09D7/61—Additives non-macromolecular inorganic
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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
- C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
- C09D7/40—Additives
- C09D7/70—Additives characterised by shape, e.g. fibres, flakes or microspheres
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Abstract
The invention discloses an insulating powder coating with extremely low melt viscosity, high gap permeability and low-temperature rapid curing, and a preparation method and application thereof. The low-temperature fast-curing insulating powder coating comprises the following raw materials in parts by weight: 25-35 parts of crystalline epoxy resin, 20-30 parts of epoxy resin without bisphenol A and BADGE, 4-5 parts of curing agent, 30-40 parts of filler, 0.8-1.2 parts of flatting agent and 0.2-0.8 part of pigment. The powder coating can be used for insulating and fixing various medium and small-sized direct current motor coils and electric tool coils, the coating method is simple, liquid glue dripping type solidification and fixation are avoided after motor iron core winding and electric tool winding, and the production efficiency of medium and small-sized direct current motors is greatly improved; tests show that the production speed of the powder coating fixed motor core wire (ring) is more than 10 times faster than that of the original method of curing and fixing by adopting liquid glue dripping. The insulating powder coating composition with extremely low melt viscosity, high gap penetration and low-temperature rapid curing has simple operation steps and strong practicability.
Description
Technical Field
The invention belongs to the technical field of insulating materials, and particularly relates to an insulating powder coating with extremely low melt viscosity, high gap penetration and low-temperature rapid curing, and a preparation method and application thereof.
Background
With the continuous development of the micro motor industry and the continuous expansion of the application field, the market demand for medium and small direct current motors is continuously improved. After an iron core is wound by a traditional small and medium-sized direct current motor, the coil is fixed by generally dripping liquid or viscous-state insulating paint for solidification, and the method is low in solidification speed and efficiency. In addition, because the epoxy insulating paint is in a liquid state, molecular chain breakage occurs in the high-temperature curing process due to lower molecular weight, VOC emission is generated, and the epoxy insulating paint is not environment-friendly. The powder coating method has the advantages of high curing speed, almost no VOC (volatile organic compounds) emission and high production efficiency, and becomes an inevitable method for curing and fixing the motor winding. The ordinary insulating powder coating has high melt viscosity at medium temperature (120-150 ℃), insufficient permeability for iron core windings, only can fix the surfaces of the windings and cannot meet the requirements of motor production! Therefore, it is imperative to develop an insulating powder coating composition with very low melt viscosity, high gap penetration, and low temperature fast cure.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide an insulating powder coating composition with extremely low melt viscosity, high gap permeability and low temperature rapid curing. And provides a preparation method of the insulating powder coating and application of the insulating powder coating as an insulating paint for fixing a motor wire group
In order to achieve the purpose, the invention adopts the following technical scheme: the low-temperature fast-curing insulating powder coating comprises the following raw materials in parts by weight: 25-35 parts of crystalline epoxy resin, 20-30 parts of epoxy resin without bisphenol A and BADGE, 4-5 parts of curing agent, 30-40 parts of filler, 0.8-1.2 parts of flatting agent and 0.2-0.8 part of pigment.
Further, the crystalline epoxy resin is one or a mixture of YSLV-80DE and YSLV-90 CY.
Furthermore, the epoxy resin without bisphenol A and BADGE is one or a mixture of KD-6712 and KD-6714.
Further, the curing agent is a compound of sebacic dihydrazide and cyanoguanidine.
Further, the curing agent is prepared by the following steps: placing the sebacic dihydrazide into a reaction kettle filled with water at the temperature of 80-90 ℃, stirring for 30min at a constant temperature, adding the cyanoguanidine, stirring for 30min at a constant temperature, heating, dehydrating and drying to obtain the curing agent, wherein the mass ratio of the sebacic dihydrazide to the water to the cyanoguanidine is 2: 10: 1.
furthermore, the filler is spherical active fused silica powder, and the granularity of the silica powder is one or a mixture of more than two of 400 meshes, 600 meshes or 800 meshes.
Further, the flatting agent is a polybutyl acrylate flatting agent.
Further, the pigment is a quinacridone type pigment having high tinting strength.
A preparation method of low-temperature fast-curing insulating powder coating comprises the following steps:
(1) weighing the raw materials according to the weight component ratio, placing the raw materials into a high-speed mixing tank, and crushing the raw materials at a high speed of 500-600 rpm for 5-10 min to obtain mixed raw material components;
(2) placing the mixed raw material components prepared in the step 1 in a double-screw extruder, heating and melting the mixed raw material components, and uniformly mixing the components to form a fluid mixture; wherein the temperature of each section of the extruder is set as follows: the feeding area is 65 +/-3 ℃, the compression area is 90 +/-3 ℃, the mixing area is 100 +/-3 ℃ and the discharging area is 95 +/-3 ℃;
(3) sequentially tabletting and cooling the fluid mixture prepared in the step 2 to form an irregular sheet with the thickness of 0.8-1.5 mm and the maximum diameter of not more than 5 cm;
(4) and (4) sequentially crushing the flaky solid matter obtained in the step (3) by an ACM mill, performing secondary cyclone separation and 120-mesh screening, and then separating out magnetic matters by a magnetic separator to obtain the low-temperature fast-curing insulating powder coating.
The application of low-temperature fast curing insulating powder paint as insulating paint for fixing motor wire set is electrostatic coating or hot dip coating, and the curing condition is 120 deg.c, 50 min or 150 deg.c, 20 min.
The winding wire group of the small and medium-sized direct current motor needs to be fixed after winding so as to prevent the winding wire group from loosening and falling off to burn the motor, a layer of insulating paint is arranged on the surface of a lead of the winding wire group, the insulating paint is melted at a temperature higher than 150 ℃ to cause insulation failure, the process for fixing the winding is required to be carried out at a temperature lower than 150 ℃, the traditional mode of dropwise adding insulating paint for curing and fixing cannot adapt to the development of the society due to the slow speed of the traditional mode, the problems of VOC emission and the like exist, the conventional insulating powder can only meet partial requirements, for example, the surface can be fixed but the permeability is poor, the low and medium-temperature curing can be carried out but the powder storage stability is poor, and the like. The invention aims to completely meet all requirements of fixing of medium and small direct current motors and motor windings of electric tools (medium and low temperature rapid curing, high permeability full fixation and better storage stability).
Selecting materials:
1. crystalline epoxy resin: because of the constant ratio structure of the repeated chain segment in the molecular structure, the epoxy resin is in a crystalline state at normal temperature, has extremely low melt viscosity (about 0.07-0.12 Pois at 150 ℃, and 22-45 Pois at common bisphenol A type solid epoxy resin), has excellent permeability when reaching the melting temperature, has extremely high rigidity because of the special structure, has low bending degree when being used as the base material, is suitable for processing and ensuring the comprehensive performance of the powder through a large number of experiments, and has 25-35 percent of the total component which is suitable and economical.
2. Bisphenol a free epoxy resin: compared with the common bisphenol A epoxy resin, the melt viscosity of the epoxy resin is about one third of that of the same type bisphenol A epoxy resin, the glass transition temperature of the epoxy resin is about 1.2 times of that of the same type bisphenol A epoxy resin, the flexibility of the epoxy resin is almost the same, the epoxy resin partially containing no bisphenol A is added so as not to greatly increase the melt viscosity of the system and greatly improve the bending strength of the coating, and the components of the epoxy resin are 20-30 percent of the total amount through a large number of experiments, which is suitable.
3. Curing agent: the purpose is to react with the epoxy resin to form the final insoluble, infusible, high molecular weight polymer. The curing agent is essentially a complex of cyanoguanidine and sebacic dihydrazide. The manufacturing method comprises the following steps: placing 2 parts of sebacic dihydrazide into a reaction kettle containing 10 parts of 80-90 ℃ water, maintaining the temperature, stirring for 30 minutes, adding 1 part of cyanoguanidine, and maintaining the temperature, and stirring for 30 minutes. Heating, dehydrating and drying to obtain the curing agent. It should be noted that the above experiment was initially conducted to improve the compatibility of cyanoguanidine with epoxy resin, and the melting point of the compound was found to be greatly reduced (146 ℃) in the test after obtaining the final product, the melting point of cyanoguanidine in the two raw materials was about 209 ℃, the melting point of sebacic dihydrazide was 186 ℃, and the melting point of the reverse compound was 146 ℃, and the mechanism thereof was not clear at present. Experiments later confirm that the compound can be rapidly cured at low temperature and has better latency.
4. Filling material: the purpose of the filler is to increase the surface hardness of the coating while reducing the cost of the present invention. The addition amount of the filler is not suitable to be too large, the hardness of the coating added with too much filler can greatly reduce the flexibility, and the fused spherical silicon micro powder is adopted for increasing the price and the cost performance. The reasons are two reasons: firstly, the silica powder is used as a filling material, and the dielectric constant of the silica powder is the lowest. The electrical strength of the coating is ensured. Secondly, the spherical volume must be minimal for the same material and weight. The maximum addition amount of the filling material is ensured on the premise of ensuring the flexibility of the coating, and the cost of the invention is reduced to the maximum extent. The components of the composition are 30 to 40 percent of the total amount through a large amount of experiments, which is suitable and economical.
5. The leveling agent is a conventional auxiliary agent of insulating powder.
6. Pigment: the pigment and the filler have certain oil absorption, the more the pigment and the filler are added, the higher the melt viscosity of the system is, certain melt viscosity and economic performance and bright coating are maintained, and the quinacridone pigment with high tinting strength is selected to be suitable for the invention, and the advantages and the beneficial effects are that:
in order to overcome the defects in the prior art, the application provides an insulation powder coating composition with extremely low melt viscosity, high gap permeability and low temperature fast curing, the insulation powder coating composition with extremely low melt viscosity, high gap permeability and low temperature fast curing has low melt viscosity, can be fast cured at low temperature and has excellent gap permeability, and a conventional powder coating method is adopted, so that the production efficiency of small and medium-sized direct current motors is greatly improved; .
1. The invention provides an insulating powder coating composition with extremely low melt viscosity, high gap permeability and low-temperature rapid curing, which adopts a conventional insulating powder coating method to replace the curing and fixing process of insulating paint with VOC emission, can be cured at low temperature, and has high curing speed and good winding fixing stability. The storage stability of the powder is good.
2. The insulating powder coating composition with extremely low melt viscosity, high gap permeability and low-temperature rapid curing does not use RoHS (RoHS) control substances and high-risk concern substances contained in the European Union Reach rule, does not discharge VOC, and better meets the requirement of environmental protection.
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.
In the experimental examples of the present invention, the coating methods used were those of conventional insulating powders, unless otherwise specified. The plate manufacturing method is all according to the GB/T6554-2003 method. Curing conditions were 120 ℃ for 50 minutes or 150 ℃ for 20 minutes
The invention discloses a method for measuring some performance indexes and a detection instrument, which comprises the following steps:
A. electrical strength: according to GB/T6554-2003 resin-based reactive composites for electrical insulation part 2: experimental methods electrical powder coating methods; the instrument model is as follows: XC-1.5, manufacturer: innovative electric power testing equipment Co., Ltd, Yichang city.
B. Bending strength: according to GB6742-86 "paint film bending test (cylindrical shaft)", instrument model QTY-10A, manufacturer: tianjin materials testing technology, Inc.
C. Melt viscosity: according to HG/T3660-1999, instrument model: PETplus, supplier: amatek (china) test instruments ltd
D. Storage stability: according to GB21782.8-2008 assessment of storage stability of thermosetting powder
E. Degree of curing: the conditions of color loss and light loss are observed by wiping with acetone (pure reagent) (5 times back and forth), and the condition of no color loss and light loss is excellent; the color is not faded, and the light loss is qualified; others being not qualified
F. Permeability; and winding the enameled wire with the diameter of 0.8mm to form a wire group, and carrying out electrostatic coating, curing and fixing, and then carrying out anatomical observation to see whether the innermost wire has an insulating fixed layer. The permeability was found to be excellent in some cases, and the permeability was not good in none cases.
Example 1
An insulation powder coating composition with extremely low melt viscosity, high gap penetration and low-temperature rapid curing comprises the following components in parts by weight:
the preparation method of the insulating powder coating composition with extremely low melt viscosity, high gap penetration and low-temperature rapid curing 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 500-600 rpm for 5-10 min to obtain mixed raw material components;
s2: melt-mixing, namely placing the mixed raw material components prepared in the step S1 into a double-screw extruder to heat and melt and uniformly mixing to form a fluid mixture; wherein the temperature of each section of the extruder is set as follows: the feeding zone is 65 +/-3 ℃, the compression zone is 90 +/-3 ℃, the mixing zone is 100 +/-3 ℃ and the discharging zone is 95 +/-3 ℃.
S3: tabletting and coarse crushing: and (4) tabletting and cooling the fluid mixture prepared in the step S2 in sequence to form irregular tablets with the thickness of 0.8-1.5 mm and the maximum diameter of not more than 5 cm.
S4: and (4) crushing. The flaky solid matter obtained in S3 was subjected to crushing, secondary cyclone separation, and 120 mesh sieving in this order by an ACM mill (air classification mill).
And S5, magnetic separation. And (3) separating magnetic substances from the powder obtained in the step (S4) by a magnetic separator, wherein the magnetic substances can influence the final electrical properties of the powder coating, so that the insulating powder coating composition with extremely low melt viscosity, high gap penetration and low-temperature rapid curing is obtained.
The detection items for verifying the beneficial effects are as follows: electrical strength, flexural strength, melt viscosity, storage stability, degree of solidification, permeability.
The relevant test items and results of example 1 are shown in Table 1, and the summary of test items of examples 1 and 2 and comparative example 1.
Example 2
An insulation powder coating composition with extremely low melt viscosity, high gap penetration and low-temperature rapid curing comprises the following components in parts by weight:
the preparation method, application method and detection items of the insulating powder coating composition with extremely low melt viscosity, high gap penetration and low-temperature quick curing are the same as those of the embodiment 1, and the detection items and results are shown in the table 1.
Comparative testing experiment
To verify the technical effects achieved by the present invention, the following comparative experiments were performed
Comparative example 1
The preparation method, application method and test items of the conventional insulating powder coating composition are the same as those of example 1, and the test results are shown in table 1.
TABLE 1
The test results in table 1 show that the comparative example cannot be rapidly cured at low temperature, while the insulating powder coating composition with extremely low melt viscosity, high gap penetration and rapid curing at low temperature of the invention has excellent permeability, extremely low melt viscosity, better storage stability and rapid curing at low temperature, and can meet the requirements without changing the conventional electrostatic powder coating process. The conventional insulating powder coating can not meet the use requirement! The above results further demonstrate the beneficial effects achieved by the present invention.
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 (10)
1. The low-temperature fast-curing insulating powder coating is characterized by comprising the following raw materials in parts by weight: 25-35 parts of crystalline epoxy resin, 20-30 parts of epoxy resin without bisphenol A and BADGE, 4-5 parts of curing agent, 30-40 parts of filler, 0.8-1.2 parts of flatting agent and 0.2-0.8 part of pigment.
2. The low temperature fast curing insulating powder coating of claim 1, characterized in that: the crystalline epoxy resin is one or a mixture of YSLV-80DE and YSLV-90 CY.
3. The low temperature fast curing insulating powder coating of claim 1, characterized in that: the epoxy resin without bisphenol A and BADGE is one or a mixture of KD-6712 and KD-6714.
4. The low temperature fast curing insulating powder coating of claim 1, characterized in that: the curing agent is a compound of sebacic dihydrazide and cyanoguanidine.
5. The low temperature fast curing insulating powder coating of claim 4, characterized in that: the curing agent is prepared by the following steps: placing sebacic dihydrazide into a reaction kettle filled with water at the temperature of 80-90 ℃, stirring for 30min at a constant temperature, adding cyanoguanidine, stirring for 30min at a constant temperature, heating, dehydrating and drying to obtain a curing agent, wherein the mass ratio of the sebacic dihydrazide to the water to the cyanoguanidine is 2: 10: 1.
6. the low temperature fast curing insulating powder coating of claim 1, characterized in that: the filler is spherical active fused silica micropowder, and the granularity of the silica micropowder is one or a mixture of more than two of 400 meshes, 600 meshes or 800 meshes.
7. The low temperature fast curing insulating powder coating of claim 1, characterized in that: the leveling agent is a polybutyl acrylate leveling agent.
8. The low temperature fast curing insulating powder coating of claim 1, characterized in that: the pigment is a quinacridone type pigment having high tinting strength.
9. A method for preparing a low temperature fast curing insulating powder coating according to any one of claims 1 to 8, characterized by comprising the steps of:
(1) weighing the raw materials according to the weight component ratio, placing the raw materials into a high-speed mixing tank, and crushing the raw materials at a high speed of 500-600 rpm for 5-10 min to obtain mixed raw material components;
(2) placing the mixed raw material components prepared in the step 1 in a double-screw extruder, heating and melting the mixed raw material components, and uniformly mixing the components to form a fluid mixture; wherein the temperature of each section of the extruder is set as follows: the feeding area is 65 +/-3 ℃, the compression area is 90 +/-3 ℃, the mixing area is 100 +/-3 ℃ and the discharging area is 95 +/-3 ℃;
(3) sequentially tabletting and cooling the fluid mixture prepared in the step 2 to form an irregular sheet with the thickness of 0.8-1.5 mm and the maximum diameter of not more than 5 cm;
(4) and (3) sequentially crushing the flaky solid matter obtained in the step (3) by an ACM mill, performing secondary cyclone separation and 120-mesh screening, and then separating out magnetic matters by a magnetic separator to obtain the low-temperature fast-curing insulating powder coating.
10. Use of a low temperature fast curing insulating powder coating according to any one of claims 1 to 8 as a fixing insulating varnish for motor line sets, characterized in that: the coating is carried out by electrostatic coating or hot dip coating, and the curing condition is 120 ℃, 50 minutes or 150 ℃ and 20 minutes.
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| CN202210364312.5A CN114574073A (en) | 2022-04-07 | 2022-04-07 | Low-temperature fast-curing insulating powder coating and preparation method and application thereof |
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| CN202210364312.5A CN114574073A (en) | 2022-04-07 | 2022-04-07 | Low-temperature fast-curing insulating powder coating and preparation method and application thereof |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103666203A (en) * | 2013-11-08 | 2014-03-26 | 洛阳双瑞防腐工程技术有限公司 | Low-temperature fast-curing epoxide powder paint and preparation method thereof |
| CN111944388A (en) * | 2020-08-11 | 2020-11-17 | 南京双洋绝缘材料有限责任公司 | Insulating powder coating for coating surface of connecting copper bar and preparation method thereof |
| CN112029381A (en) * | 2020-09-09 | 2020-12-04 | 溧阳市永新绝缘粉末有限公司 | Insulating powder with good flexibility and mechanical impact resistance, preparation method and application method |
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2022
- 2022-04-07 CN CN202210364312.5A patent/CN114574073A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103666203A (en) * | 2013-11-08 | 2014-03-26 | 洛阳双瑞防腐工程技术有限公司 | Low-temperature fast-curing epoxide powder paint and preparation method thereof |
| CN111944388A (en) * | 2020-08-11 | 2020-11-17 | 南京双洋绝缘材料有限责任公司 | Insulating powder coating for coating surface of connecting copper bar and preparation method thereof |
| CN112029381A (en) * | 2020-09-09 | 2020-12-04 | 溧阳市永新绝缘粉末有限公司 | Insulating powder with good flexibility and mechanical impact resistance, preparation method and application method |
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