CN113292909A - Moisture-resistant polyester enameled wire and preparation method thereof - Google Patents
Moisture-resistant polyester enameled wire and preparation method thereof Download PDFInfo
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- CN113292909A CN113292909A CN202110561573.1A CN202110561573A CN113292909A CN 113292909 A CN113292909 A CN 113292909A CN 202110561573 A CN202110561573 A CN 202110561573A CN 113292909 A CN113292909 A CN 113292909A
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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
- C09D167/00—Coating compositions based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Coating compositions based on derivatives of such polymers
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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
- C09D7/63—Additives non-macromolecular organic
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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
- C09D7/65—Additives macromolecular
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/0016—Apparatus or processes specially adapted for manufacturing conductors or cables for heat treatment
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/06—Insulating conductors or cables
- H01B13/065—Insulating conductors with lacquers or enamels
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
- H01B3/42—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes polyesters; polyethers; polyacetals
- H01B3/421—Polyesters
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
- H01B3/46—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes silicones
- H01B3/465—Silicone oils
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/02—Disposition of insulation
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/20—Applications use in electrical or conductive gadgets
- C08L2203/202—Applications use in electrical or conductive gadgets use in electrical wires or wirecoating
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Wood Science & Technology (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Materials Engineering (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Manufacturing & Machinery (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Thermal Sciences (AREA)
- Paints Or Removers (AREA)
Abstract
The invention discloses a moisture-proof polyester enameled wire and a preparation method thereof, wherein a small amount of silicone polyester resin is added into polyester paint, and when a film is formed by baking after painting, a large amount of the silicone polyester resin migrates to the surface layer of the painting before curing due to the low surface tension of the silicone polyester resin, so that a moisture-proof layer on the surface layer is formed; meanwhile, the water absorption of the paint film is reduced by utilizing the strong repulsion of the PE or PP micro powder to moisture; particularly, after surface silanization modification, the bonding force with paint film molecules is stronger, and meanwhile, the working performance can be further prevented from being influenced by moisture; the moisture-resistant polyester enameled wire prepared by the invention has stable performance under the condition of damp-heat aging and has working stability under the condition of high temperature and high humidity.
Description
Technical Field
The invention relates to a preparation process of an enameled wire, in particular to a moisture-resistant polyester enameled wire and a preparation method thereof.
Background
The enameled wire is an important electrical insulation part, and is used for generating a good insulation layer between a lead and a lead in a winding to organize the circulation of current and maintain the normal and stable operation of the whole workpiece equipment, so that the enameled wire needs to have higher mechanical strength, temperature resistance and aging resistance.
The polyester enameled wire has good mechanical strength, paint film adhesion performance, excellent electrical and scratch resistance, chemical resistance, thermal stability and solvent resistance, is widely used, and is widely applied to the fields of sealed submersible motors, microgenerators, heat-resistant transformers and the like.
However, the polyester enameled wire is sensitive to moisture due to the existence of redundant hydrophilic hydroxyl or carboxyl during the synthesis of polyester resin, and generally ages faster at high temperature, which limits the use of the polyester enameled wire.
Therefore, the moisture-resistant polyester enameled wire and the preparation method thereof are developed, and the moisture-resistant polyester enameled wire has working stability under the condition of high temperature and high humidity and is higher and stable in breakdown voltage.
Disclosure of Invention
The moisture-resistant polyester enameled wire and the preparation method thereof have the advantages of working stability under the high-temperature and high-humidity condition, and high and stable breakdown voltage.
A preparation method of moisture-resistant polyester enameled wire comprises the following steps:
1) and a blank preparation step: industrial pure copper is used as a blank, and the appearance of the copper material is ensured to have no defects of oxidation, burrs and cracks;
2) and a wire drawing step: the copper material is subjected to large stretching, medium stretching, small stretching and micro stretching to obtain a bare copper wire;
3) cleaning oil stains and particles on the surface of the bare copper wire;
4) annealing, namely annealing the cleaned bare copper wire in an annealing furnace at the temperature of 500-700 ℃;
5) painting the surface of the annealed bare copper wire, wherein the paint liquid is polyester paint, and baking and curing are carried out after painting;
6) and a lubricating step: after cooling the baked bare copper wire rod, coating a lubricant on the surface of the bare copper wire rod;
7) and a wire take-up step: and the winding device is used for winding the enameled wire.
Further, the composition of the polyester paint is as follows:
35-50 parts of polyester resin; 10-15 parts of silicone polyester resin; 6-10 parts of a filler; 20-30 parts of a solvent; 1-2 parts of curing agent and 0.01-0.03 part of polymerization inhibitor.
Further, the polyester resin is one of TOYOBO GK360, GK680 and GK 880.
Further, the silicone polyester resin is one of Xinyue KR5230, KR5234 and KR 5235.
Further, the filler is PE or PP micro powder with the particle size of 20 nm-50 nm.
Further, the solvent is toluene or xylene.
Further, the curing agent is tetra (trimethylsiloxy) titanium or di (triethanolamine) diisopropyl titanate.
Further, the polymerization inhibitor is one of hydroquinone, methylhydroquinone and diphenylamine.
Further, the filler can be subjected to surface silanization modification, and the preparation method comprises the following steps:
(1) dissolving 3-5% of silane coupling agent and 0.5-1% of ethoxylated (tallow alkyl) amine by mass in absolute ethyl alcohol to prepare silane coupling agent solution;
(2) performing surface activation on the filler in a corona mode to prepare an activated filler;
(3) mixing silane coupling agent solution and activated filler according to the mass ratio of 0.3-0.5: 1, removing the solvent at the temperature of 70-90 ℃ and the vacuum degree of-0.08 MPa-0.09 MPa, grinding and crushing after removing the solvent to obtain the surface silanization modified filler.
Further, the silane coupling agent is one of A-151, A-171 and A-172.
Furthermore, 3-5 parts of Huyou scientific SY-8100 moisture curing polyurethane resin is additionally added into the polyester paint.
The invention has the advantages that:
1. according to the invention, a small amount of silicone polyester resin is added into the polyester paint, and when the polyester paint is baked to prepare a film after painting, a large amount of the silicone polyester resin migrates to the surface layer of the painting before curing due to the low surface tension of the silicone polyester resin, so that a surface moisture-proof layer is formed; in some documents, examples of using fluorosilicone resins are reported, but all of the fluorosilicone resins are too high in cost and not beneficial to commercialization of products, and the fluorosilicone resins have low surface tension, so that the metal substrate has low adhesion when used in a large amount;
2. the invention utilizes the strong repulsion of PE or PP micro powder to moisture to reduce the water absorption of a paint film; particularly, after surface silanization modification, the bonding force with paint film molecules is stronger, and meanwhile, the working performance can be further prevented from being influenced by moisture;
3. the ethoxylated (tallow alkyl) amine can effectively reduce the aging speed of a paint film, is very effective for preventing moisture from influencing the working performance, and can partially replace the action of a polymerization inhibitor, so that the polyester paint is more stable;
4. a small amount of moisture-curing polyurethane resin is added into the polyester paint, so that the moisture-proof performance of a paint film tends to rise in the subsequent use process of the enameled wire, and the influence of moisture of the enameled wire in a high-temperature environment is favorably reduced.
Detailed Description
Example 1
A preparation method of moisture-resistant polyester enameled wire comprises the following steps:
35 parts of polyester resin; 15 parts of silicone polyester resin; 6 parts of a filler; 20 parts of a solvent; 1 part of curing agent and 0.01 part of polymerization inhibitor.
The polyester resin is TOYOBO GK 360.
The silicone polyester resin is shin-over KR 5230.
The filler is PP micro powder with the particle size of 20 nm.
The solvent is toluene.
The curing agent is di (triethanolamine) diisopropyl titanate.
The polymerization inhibitor is hydroquinone.
Example 2
A preparation method of moisture-resistant polyester enameled wire comprises the following steps:
40 parts of polyester resin; 12 parts of silicone polyester resin; 8 parts of a filler; 25 parts of a solvent; 1.2 parts of curing agent and 0.02 part of polymerization inhibitor.
The polyester resin is TOYOBO GK 680.
The silicone polyester resin is seiko KR 5234.
The filler is PE micro powder with the particle size of 40 nm.
The solvent is xylene.
The curing agent is tetra (trimethylsiloxy) titanium.
The polymerization inhibitor is methyl hydroquinone.
Example 3
A preparation method of moisture-resistant polyester enameled wire comprises the following steps:
50 parts of polyester resin; 10 parts of silicone polyester resin; 10 parts of a filler; 30 parts of a solvent; 2 parts of curing agent and 0.03 part of polymerization inhibitor.
The polyester resin is TOYOBO GK 880.
The silicone polyester resin is shin-over KR 5235.
The filler is PE micro powder with the particle size of 50 nm.
The solvent is xylene.
The curing agent is tetra (trimethylsiloxy) titanium.
The polymerization inhibitor is p-diphenylamine.
Example 4
A preparation method of moisture-resistant polyester enameled wire, wherein the PE micro powder is subjected to surface silanization modification, and the preparation method comprises the following steps:
(1) dissolving 4% by mass of silane coupling agent A-151 and 0.8% by mass of ethoxylated (tallow alkyl) amine in absolute ethyl alcohol to prepare a silane coupling agent solution;
(2) performing surface activation on the filler in a corona mode to prepare an activated filler;
(3) mixing silane coupling agent solution and activated filler according to the mass ratio of 0.4:1, removing the solvent at the temperature of 80 ℃ and the vacuum degree of-0.09 MPa, and grinding and crushing the mixture after removing the solvent to obtain the surface silanization modified filler; the rest is the same as in example 2.
Example 5
4 parts of Huyou scientific SY-8100 moisture curing polyurethane resin is added into the polyester paint, and the rest is the same as the example 2.
Comparative example 1
A method for preparing a polyester enameled wire, wherein no silicone polyester resin is added, the rest is the same as example 2.
Comparative example 2
A method for preparing a polyester enameled wire, wherein no filler is added, the rest is the same as example 2.
Comparative example 3
The preparation method of the polyester enameled wire is the same as the example 2 except that no polymerization inhibitor is added.
Comparative example 4
The preparation method of the polyester enameled wire is the same as that of the example 4 except that no ethoxylated (tallow alkyl) amine is added during the silanization modification of the PE micro powder surface.
Comparative example 5
The preparation method of the polyester enameled wire is the same as that of the example 4 except that no polymerization inhibitor is added.
And (3) performance testing:
the bare copper wires with the diameter of 0.9mm in the same batch are selected in the comparative examples and the embodiment, and are annealed at 550 ℃ to be used for the production of the enameled wires in the comparative examples and the embodiment, and the thickness of the paint film is unified to be 0.070 mm.
Firstly, testing the aging performance of a paint film:
the paint film and the enameled wire are tested for original performance, then aged for 1 month under the accelerated conditions of 60 ℃ of temperature and 80% of humidity, and the performance after aging is tested and used as comparison.
1. Pencil hardness: the polyester paint of the comparative examples and the examples is separately prepared into a film, and then the original pencil hardness and the pencil hardness after aging of the polyester paint film prepared by each example and comparative example are tested according to GB/T6739-2006 determination of paint film hardness by color paint and varnish pencil method;
2. flexibility and adhesion: according to GB/T6109.1-2008' enamelled round winding wire part 1: the flexibility and the adhesive force of the enameled wire are tested by a winding experiment and a snap-off experiment in general regulation and GB/T4074-2008 winding wire test method, the flexibility is good when a paint film in the winding experiment is not cracked, and the adhesive force is good when the paint film in the snap-off experiment is not lost;
3. scratch resistance: according to GB/T6109.1-2008' enamelled round winding wire part 1: the scratch resistance of the enameled wire prepared in each embodiment and the comparative example is tested according to general regulations and GB/T4074-2008 winding wire test method, the scratch resistance takes the minimum scratch force of the test as an index, and the larger the minimum scratch force is, the better the scratch resistance is;
4. breakdown voltage: according to GB/T6109.2-2008 < 2 nd part of enamelled round winding wire: the breakdown voltage of the enameled wire prepared in each embodiment and comparative example at room temperature and high temperature (155 ℃) is tested in a polyester enameled copper round wire grade 155 and GB/T4074-2008 winding wire test method;
the results of the above tests are shown in Table 1.
Second, storage stability test of polyester paint
The polyester paints prepared in the examples and comparative examples were tested for a time interval required for the viscosity to increase by 10% under an accelerated condition at 60 ℃, and the longer the time interval, the more stable the polyester paints, and the test results are shown in table 2.
TABLE 1
TABLE 2
| Test specimen | Time interval (Tian) required for viscosity increase of 10% |
| Example 1 polyester paint | 10 |
| Example 2 polyester paint | 11 |
| Example 3 polyester paint | 11 |
| Example 4 polyester paint | 13 |
| Example 5 polyester paint | 11 |
| Comparative example 1 polyester paint | 12 |
| Comparative example 2 polyester paint | 10 |
| Comparative example 3 polyester paint | 2 |
| Comparative example 4 polyester paint | 10 |
| Comparative example 5 polyester paint | 8 |
As can be seen from the table 1, the invention adds a small amount of silicone polyester resin into the polyester paint, can effectively prevent moisture from invading the paint film, and has obvious effect on stabilizing the performance of polyester enameled wires in the damp-heat aging test; meanwhile, the PE or PP micro powder has strong repulsion to moisture, particularly has stronger binding force with paint film molecules after surface silanization modification, and can further prevent the moisture from influencing the working performance; a small amount of moisture-curing polyurethane resin is added into the polyester paint, so that the moisture-proof performance of a paint film tends to rise in the subsequent use process of the enameled wire, and the influence of moisture of the enameled wire in a high-temperature environment is favorably reduced.
The performance comparison trend also accords with other polyester enameled wires with different paint film thicknesses.
As can be seen from Table 2, ethoxylated (tallow alkyl) amines are effective in reducing the rate of aging of the paint film, are also effective in preventing moisture from affecting the performance, and can partially replace the polymerization inhibitor, making the polyester paint more stable.
And finally: the above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that are within the spirit and principle of the present invention are intended to be included in the scope of the present invention.
Claims (10)
1. A preparation method of moisture-resistant polyester enameled wire is characterized by comprising the following steps: the preparation method comprises the following steps:
1) and a blank preparation step: industrial pure copper is used as a blank, and the appearance of the copper material is ensured to have no defects of oxidation, burrs and cracks;
2) and a wire drawing step: the copper material is subjected to large stretching, medium stretching, small stretching and micro stretching to obtain a bare copper wire;
3) cleaning oil stains and particles on the surface of the bare copper wire;
4) annealing, namely annealing the cleaned bare copper wire in an annealing furnace at the temperature of 500-700 ℃;
5) painting the surface of the annealed bare copper wire, wherein the paint liquid is polyester paint, and baking and curing are carried out after painting;
6) and a lubricating step: after cooling the baked bare copper wire rod, coating a lubricant on the surface of the bare copper wire rod;
7) and a wire take-up step: and the winding device is used for winding the enameled wire.
2. A method for preparing moisture-resistant polyester enameled wire according to claim 1, characterized in that: the polyester paint comprises the following components:
35-50 parts of polyester resin; 10-15 parts of silicone polyester resin; 6-10 parts of a filler; 20-30 parts of a solvent; 1-2 parts of curing agent and 0.01-0.03 part of polymerization inhibitor.
3. A method for preparing moisture-resistant polyester enameled wire according to claim 2, characterized in that: the polyester resin is one of TOYOBO GK360, GK680 and GK 880.
4. A method for preparing moisture-resistant polyester enameled wire according to claim 2, characterized in that: the silicone polyester resin is one of Xinyue KR5230, KR5234 and KR 5235.
5. A method for preparing moisture-resistant polyester enameled wire according to claim 2, characterized in that: the filler is PE or PP micro powder with the particle size of 20 nm-50 nm.
6. A method for preparing moisture-resistant polyester enameled wire according to claim 2, characterized in that: the solvent is toluene or xylene; the curing agent is tetra (trimethylsiloxy) titanium or di (triethanolamine) diisopropyl titanate; the polymerization inhibitor is one of hydroquinone, methylhydroquinone and diphenylamine.
7. A method for preparing moisture-resistant polyester enameled wire according to claim 2, characterized in that: the filler can be subjected to surface silanization modification, and the preparation method comprises the following steps:
(1) dissolving 3-5% of silane coupling agent and 0.5-1% of ethoxylated (tallow alkyl) amine by mass in absolute ethyl alcohol to prepare silane coupling agent solution;
(2) performing surface activation on the filler in a corona mode to prepare an activated filler;
(3) mixing silane coupling agent solution and activated filler according to the mass ratio of 0.3-0.5: 1, removing the solvent at the temperature of 70-90 ℃ and the vacuum degree of-0.08 MPa-0.09 MPa, grinding and crushing after removing the solvent to obtain the surface silanization modified filler.
8. A method for preparing moisture-resistant polyester enameled wire according to claim 7, characterized in that: the silane coupling agent is one of A-151, A-171 and A-172.
9. A method for preparing moisture-resistant polyester enameled wire according to claim 2, characterized in that: and 3-5 parts of Huyou scientific SY-8100 moisture curing polyurethane resin is additionally added into the polyester paint.
10. Moisture-resistant polyester enamelled wire obtained with a polyester paint according to any of claims 2 to 9.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110561573.1A CN113292909A (en) | 2021-05-22 | 2021-05-22 | Moisture-resistant polyester enameled wire and preparation method thereof |
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| CN202110561573.1A CN113292909A (en) | 2021-05-22 | 2021-05-22 | Moisture-resistant polyester enameled wire and preparation method thereof |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104130699A (en) * | 2014-07-18 | 2014-11-05 | 上海晟然绝缘材料有限公司 | High adhesion and solvent resistant insulating paint for polyester imide enameled wire and preparation method thereof |
| CN107903774A (en) * | 2017-11-10 | 2018-04-13 | 陈建峰 | A kind of flame retardant type wire enamel |
| CN109065260A (en) * | 2018-07-25 | 2018-12-21 | 瑞安市中德电工器材有限公司 | A kind of enameled wire and its production technology |
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2021
- 2021-05-22 CN CN202110561573.1A patent/CN113292909A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104130699A (en) * | 2014-07-18 | 2014-11-05 | 上海晟然绝缘材料有限公司 | High adhesion and solvent resistant insulating paint for polyester imide enameled wire and preparation method thereof |
| CN107903774A (en) * | 2017-11-10 | 2018-04-13 | 陈建峰 | A kind of flame retardant type wire enamel |
| CN109065260A (en) * | 2018-07-25 | 2018-12-21 | 瑞安市中德电工器材有限公司 | A kind of enameled wire and its production technology |
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