CN115141544A - High-temperature-resistant acid-corrosion-resistant coating and enameled wire - Google Patents
High-temperature-resistant acid-corrosion-resistant coating and enameled wire Download PDFInfo
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- CN115141544A CN115141544A CN202210563784.3A CN202210563784A CN115141544A CN 115141544 A CN115141544 A CN 115141544A CN 202210563784 A CN202210563784 A CN 202210563784A CN 115141544 A CN115141544 A CN 115141544A
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- 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
- C09D183/00—Coating compositions based on macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon, with or without sulfur, nitrogen, oxygen, or carbon only; Coating compositions based on derivatives of such polymers
- C09D183/04—Polysiloxanes
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- C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
- C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
- C09D5/08—Anti-corrosive paints
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- 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
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- H01B3/308—Wires with resins
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Abstract
The invention discloses a high-temperature-resistant acid-corrosion-resistant paint and an enameled wire, wherein the high-temperature-resistant acid-corrosion-resistant paint comprises the following components in parts by weight: 63-85 parts of organic silicon resin, 10-15 parts of scandium tantalate @ modified polyester microspheres, 6-10 parts of inorganic filler, 0.5-1 part of dispersing agent, 0.2-0.6 part of defoaming agent, 0.3-0.8 part of film forming agent, 0.4-0.8 part of wetting agent and 0.1-0.5 part of curing agent. The coating has good high temperature resistance, mechanical property, acid corrosion resistance and adhesion, and can play a good protection role in a severe environment, so that a good safety protection role is played, and the service life of motor equipment is prolonged.
Description
Technical Field
The invention relates to the field of enameled wires, in particular to a high-temperature-resistant acid-corrosion-resistant coating and an enameled wire.
Background
The enameled wire is a commonly used material of a motor and consists of a conductor and an insulating layer, the bare wire is annealed and softened, and then is subjected to painting and baking for multiple times to obtain the wire. In the process of continuous operation of the motor, the winding needs to be continuously electrified, so that the motor is ensured to continuously work, and heat can be generated due to long-time electrification and friction in the motor, so that the high-temperature resistance of the enameled wire is higher, and the long-time stable operation of the motor can be ensured; in addition, the enameled wire is often exposed in the air and is easily corroded by a plurality of acidic corrosive gases in the air, while the conventional enameled wire has poor surface corrosion resistance, and once corroded, the normal use of the enameled wire is seriously influenced. Therefore, there is a need for a coating that is both resistant to high temperatures and acid corrosion, thereby providing better protection to the enameled wire.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a high-temperature-resistant acid-corrosion-resistant coating and an enameled wire.
The purpose of the invention is realized by adopting the following technical scheme:
in a first aspect, the invention discloses a high-temperature-resistant acid-corrosion-resistant coating, which comprises the following components in parts by weight:
63-85 parts of organic silicon resin, 10-15 parts of scandium tantalate @ modified polyester microspheres, 6-10 parts of inorganic filler, 0.5-1 part of dispersing agent, 0.2-0.6 part of defoaming agent, 0.3-0.8 part of film forming agent, 0.4-0.8 part of wetting agent and 0.1-0.5 part of curing agent.
Preferably, the high-temperature-resistant acid-corrosion-resistant coating comprises the following components in parts by weight:
72 parts of organic silicon resin, 13 parts of scandium tantalate @ modified polyester microspheres, 8 parts of inorganic filler, 0.6 part of dispersing agent, 0.4 part of defoaming agent, 0.5 part of film forming agent, 0.6 part of wetting agent and 0.3 part of curing agent.
Preferably, the particle size of the scandium tantalate @ modified polyester microsphere is 30-50 μm.
Preferably, the inorganic filler comprises mica powder and talcum powder, the particle size is 20-30 μm, and the mass ratio of the mica powder to the talcum powder is 1-2.
Preferably, the dispersant is one of HY-168, HY-5040 and HY-190.
Preferably, the defoaming agent is one of TEGO-902W, TEGO-901W and BYK-141.
Preferably, the wetting agent is Dow Corning DC-67 or Dow Corning DC-501W.
Preferably, the curing agent is diethylenetriamine and/or triethylenetetramine.
Preferably, the preparation method of the scandium tantalate @ modified polyester microsphere comprises the following steps:
s1, preparation of a pretreatment reaction solution:
mixing tantalum oxalate and scandium chloride in deionized water, fully stirring until the mixture is clear, firstly dropwise adding an ammonium fluoride aqueous solution, uniformly stirring, then dropwise adding a urea aqueous solution, and uniformly stirring again to obtain a pretreatment reaction solution;
s2, preparing modified polyester porous microspheres:
(1) weighing terephthalic acid and 1, 4-butanediol, mixing, heating to 150-160 ℃, stirring for 2-4h, adding a catalyst, heating to 210-230 ℃, and carrying out polycondensation reaction for 1-2h to obtain polybutylene terephthalate;
(2) weighing polybutylene terephthalate, nano tantalum carbide powder, polyvinylpyrrolidone and tetrahydrofuran, mixing, uniformly stirring, heating to 60-70 ℃, carrying out reflux stirring treatment for 2-4h, stopping heating, simultaneously adding ethanol, continuously stirring until the temperature is reduced to room temperature, filtering out precipitated solids, washing with ethanol for three times, and drying under reduced pressure to obtain modified polyester porous microspheres;
s3, preparing scandium tantalate @ modified polyester microspheres:
mixing the modified polyester porous microspheres with the pretreatment reaction liquid, fully stirring, pouring into a reaction kettle, heating the reaction kettle to 150-170 ℃, carrying out heat preservation reaction for 10-18h, cooling to room temperature, filtering out solids, washing with deionized water and ethanol for at least three times in sequence, drying under reduced pressure, and then treating at 180-200 ℃ for 1-3h to obtain scandium tantalate @ modified polyester microspheres.
Preferably, in the S1, the mass ratio of the tantalum oxalate to the scandium chloride to the deionized water is 1.21-1.36; the mass fraction of the ammonium fluoride aqueous solution is 15%, wherein the mass ratio of ammonium fluoride to tantalum oxalate is 1; the mass fraction of the urea aqueous solution is 25%, wherein the mass ratio of urea to tantalum oxalate is 1.
Preferably, in the S2, the mass ratio of the terephthalic acid to the 1, 4-butanediol is 1.7-2.1; the catalyst is tetrabutyl titanate, and the adding amount of the catalyst is 2-4% of that of the terephthalic acid.
Preferably, in the S2, the mass ratio of polybutylene terephthalate, polyvinylpyrrolidone and tetrahydrofuran is 1.8-2.2; the mass ratio of the ethanol to the tetrahydrofuran is 1; the mass ratio of the nano tantalum carbide powder to the polybutylene terephthalate is 0.2-0.4.
Preferably, the nano tantalum carbide powder has a particle size of 200-300nm.
Preferably, in S3, the mass ratio of the modified polyester porous microspheres to the pretreatment reaction liquid is 1.
Preferably, the preparation method of the high-temperature-resistant acid-corrosion-resistant coating is as follows:
the preparation method comprises the following steps of weighing organic silicon resin, scandium tantalate @ modified polyester microspheres, inorganic filler and dispersing agent in sequence, uniformly mixing, weighing and adding the defoaming agent, the film forming agent and the wetting agent, uniformly mixing again, then adding the weighed curing agent, and uniformly mixing.
In a second aspect, the invention discloses an enameled wire, wherein the enameled wire is obtained by coating the high-temperature-resistant acid-corrosion-resistant coating prepared in the above way on the surface layer of a conductor wire and drying the coated conductor wire.
Preferably, the material of the conductor wire is one of copper, aluminum or alloy.
Preferably, the coating method is spin coating on a spin coater.
Preferably, the diameter of the conductor wire is 0.5-1.5mm, and the coating thickness of the high-temperature-resistant acid-corrosion-resistant coating on the conductor wire is 0.06-0.12mm.
Preferably, the drying mode is that the mixture is placed in an oven at 150-170 ℃ for 1-2 hours after being placed at room temperature for 1-4 hours.
The beneficial effects of the invention are as follows:
the high-temperature-resistant and corrosion-resistant coating is used for coating enameled wires, has good high-temperature resistance, mechanical property, acid corrosion resistance and adhesion, and can play a good protection role in a severe environment, so that a good safety protection role is played, and the service life of motor equipment is prolonged.
The organic silicon resin is used as a main material, and is widely applied as a high polymer material with high temperature resistance and acid corrosion resistance, but the organic silicon resin has the defects of reduced coating adhesion, low mechanical strength, low interlaminar shear strength and the like at high temperature, so that the application of the organic silicon resin in enameled wires is limited. According to the invention, the performance of the coating is improved by adding the self-made scandium tantalate @ modified polyester microspheres, so that the mechanical property of the coating is improved, and the high temperature resistance of the coating is also improved.
Polybutylene terephthalate (PBT) is widely used in electronic and electric appliances, automobile parts, machinery, household goods and the like because of good chemical stability, good electrical insulation, low water absorption and good luster. But due to the defects of low glass transition temperature, low notch impact strength and large molding shrinkage of PBT, the high temperature resistance and flexibility of the organic silicon resin can be influenced when the PBT is directly added into the organic silicon resin, so that the microsphere is prepared by using polybutylene terephthalate and is modified at the same time, and the scandium tantalate @ modified polyester microsphere is finally prepared.
The invention discloses scandium tantalate @ modified polyester microspheres, which are prepared by firstly preparing modified polyester porous microspheres and then generating scandium tantalate in situ on the surfaces and in pores of the modified polyester porous microspheres. (1) The preparation of the modified polyester porous microspheres adopts the steps that polyester products synthesized by raw materials are dissolved in a good solvent (tetrahydrofuran) at high temperature, then nano tantalum carbide powder and a poor solvent (ethanol) are added, the temperature is reduced and the stirring is carried out continuously, so that the polyester is gradually combined with the nano tantalum carbide powder to form microspheres to be separated out, and in the process, added dispersing agent (polyvinylpyrrolidone) can gradually migrate, so that a porous structure is formed. The nanometer tantalum carbide powder has extremely high melting point and hardness, excellent chemical stability, and is combined with polyester for modification to improve the high temperature resistance and mechanical property of the polyester. (2) In-situ generation of scandium tantalate is to form a pretreatment reaction liquid under the action of ammonium fluoride and urea by using tantalum oxalate and scandium chloride, then mix the pretreatment reaction liquid with the polyester porous microspheres in a reaction kettle, and form scandium tantalate gradually on the surfaces and in pores of polyester under the high-temperature hydrothermal condition, so that the scandium tantalate @ modified polyester microspheres are prepared.
Drawings
The invention is further illustrated by means of the attached drawings, but the embodiments in the drawings do not constitute any limitation to the invention, and for a person skilled in the art, other drawings can be obtained on the basis of the following drawings without inventive effort.
FIG. 1 is a scanning electron microscope image of scandium tantalate @ modified polyester microspheres prepared in example 1 of the present invention.
Detailed Description
For the purpose of more clearly illustrating the present invention and more clearly understanding the technical features, objects and advantages of the present invention, the technical solutions of the present invention will now be described in detail below, but are not to be construed as limiting the implementable scope of the present invention.
The invention is further described below with reference to the following examples.
Example 1
A high-temperature-resistant acid-corrosion-resistant coating comprises the following components in parts by weight:
72 parts of organic silicon resin, 13 parts of scandium tantalate @ modified polyester microspheres, 8 parts of inorganic filler, 0.6 part of dispersing agent, 0.4 part of defoaming agent, 0.5 part of film forming agent, 0.6 part of wetting agent and 0.3 part of curing agent.
The inorganic filler comprises mica powder and talcum powder, the particle sizes are 20-30 mu m, and the mass ratio of the mica powder to the talcum powder is 2; the dispersant is HY-168; the defoaming agent is TEGO-902W; the wetting agent is Dow Corning DC-67; the curing agent is diethylenetriamine.
The particle size of the scandium tantalate @ modified polyester microsphere is 30-50 microns, a scanning electron microscope image of the scandium tantalate @ modified polyester microsphere is shown in figure 1, and the preparation method of the scandium tantalate @ modified polyester microsphere comprises the following steps:
s1, preparation of a pretreatment reaction solution:
mixing tantalum oxalate and scandium chloride in deionized water, fully stirring until the mixture is clear, firstly dropwise adding an ammonium fluoride aqueous solution, uniformly stirring, then dropwise adding a urea aqueous solution, and uniformly stirring again to obtain a pretreatment reaction solution; wherein the mass ratio of the tantalum oxalate to the scandium chloride to the deionized water is 1.27; the mass fraction of the ammonium fluoride aqueous solution is 15%, wherein the mass ratio of ammonium fluoride to tantalum oxalate is 1; the mass fraction of the urea aqueous solution is 25%, wherein the mass ratio of urea to tantalum oxalate is 1.
S2, preparing modified polyester porous microspheres:
(1) weighing terephthalic acid and 1, 4-butanediol, mixing, heating to 150 ℃, stirring for 3 hours, adding a catalyst, heating to 220 ℃, and carrying out polycondensation reaction for 1.5 hours to obtain polybutylene terephthalate; wherein the mass ratio of terephthalic acid to 1, 4-butanediol is 1.8; the catalyst is tetrabutyl titanate, and the addition amount of the catalyst is 3 percent of that of the terephthalic acid.
(2) Weighing polybutylene terephthalate, nano tantalum carbide powder, polyvinylpyrrolidone and tetrahydrofuran, mixing, uniformly stirring, heating to 60 ℃, carrying out reflux stirring treatment for 3 hours, stopping heating, adding ethanol, continuing stirring until the temperature is reduced to room temperature, filtering out precipitated solids, washing with ethanol for three times, and drying under reduced pressure to obtain modified polyester porous microspheres; wherein the mass ratio of polybutylene terephthalate, polyvinylpyrrolidone and tetrahydrofuran is 2; the mass ratio of ethanol to tetrahydrofuran is 1; the mass ratio of the nano tantalum carbide powder to the polybutylene terephthalate is 0.3.
S3, preparing scandium tantalate @ modified polyester microspheres:
mixing the modified polyester porous microspheres with the pretreatment reaction liquid, fully stirring, pouring into a reaction kettle, heating the reaction kettle to 160 ℃, carrying out heat preservation reaction for 14 hours, cooling to room temperature, filtering out solids, washing with deionized water and ethanol for at least three times in sequence, drying under reduced pressure, and then treating at 200 ℃ for 2 hours to obtain scandium tantalate @ modified polyester microspheres; wherein the mass ratio of the modified polyester porous microspheres to the pretreatment reaction liquid is 1.
The preparation method of the high-temperature-resistant acid-corrosion-resistant coating comprises the following steps:
sequentially weighing the organic silicon resin, the scandium tantalate @ modified polyester microspheres, the inorganic filler and the dispersing agent, mixing and stirring for 2 hours, then weighing and adding the defoaming agent, the film forming agent and the wetting agent, mixing for 1 hour again, then adding the weighed curing agent, and mixing for 0.5 hour.
In this embodiment, the high-temperature-resistant acid-corrosion-resistant coating prepared by the method is coated on the surface layer of a copper conductor wire with the diameter of 1mm in a rotating manner by a spin coater, the coating thickness is 0.1mm, and then the coating is placed in an oven at 160 ℃ for 2 hours after being placed at room temperature for 3 hours, so as to obtain an enameled wire.
Example 2
The high-temperature-resistant acid-corrosion-resistant coating comprises the following components in parts by weight:
63 parts of organic silicon resin, 10 parts of scandium tantalate @ modified polyester microspheres, 6 parts of inorganic filler, 0.5 part of dispersing agent, 0.2 part of defoaming agent, 0.3 part of film forming agent, 0.4 part of wetting agent and 0.1 part of curing agent.
The inorganic filler comprises mica powder and talcum powder, the particle size is 20-30 mu m, and the mass ratio of the mica powder to the talcum powder is 1; the dispersant is HY-5040; the defoaming agent is TEGO-901W; the wetting agent is Dow Corning DC-501W; the curing agent is triethylene tetramine.
The particle size of the scandium tantalate @ modified polyester microsphere is 30-50 mu m, and the preparation method of the scandium tantalate @ modified polyester microsphere comprises the following steps:
s1, preparation of a pretreatment reaction solution:
mixing tantalum oxalate and scandium chloride in deionized water, fully stirring until the mixture is clear, firstly dropwise adding an ammonium fluoride aqueous solution, uniformly stirring, then dropwise adding a urea aqueous solution, and uniformly stirring again to obtain a pretreatment reaction solution; wherein the mass ratio of the tantalum oxalate to the scandium chloride to the deionized water is 1.21; the mass fraction of the ammonium fluoride aqueous solution is 15%, wherein the mass ratio of ammonium fluoride to tantalum oxalate is 1; the mass fraction of the urea aqueous solution is 25%, wherein the mass ratio of urea to tantalum oxalate is 1.
S2, preparing modified polyester porous microspheres:
(1) weighing terephthalic acid and 1, 4-butanediol, mixing, heating to 150 ℃, stirring for 2 hours, adding a catalyst, heating to 210 ℃, and carrying out polycondensation reaction for 1 hour to obtain polybutylene terephthalate; wherein the mass ratio of terephthalic acid to 1, 4-butanediol is 1.7; the catalyst is tetrabutyl titanate, and the addition amount of the catalyst is 2 percent of that of the terephthalic acid.
(2) Weighing polybutylene terephthalate, nano tantalum carbide powder, polyvinylpyrrolidone and tetrahydrofuran, mixing, uniformly stirring, heating to 60 ℃, carrying out reflux stirring treatment for 2 hours, stopping heating, simultaneously adding ethanol, continuing stirring until the temperature is reduced to room temperature, filtering out precipitated solid, washing with ethanol for three times, and drying under reduced pressure to obtain modified polyester porous microspheres; wherein the mass ratio of polybutylene terephthalate, polyvinylpyrrolidone and tetrahydrofuran is 1.8; the mass ratio of ethanol to tetrahydrofuran is 1; the mass ratio of the nano tantalum carbide powder to the polybutylene terephthalate is 0.2.
S3, preparing scandium tantalate @ modified polyester microspheres:
mixing the modified polyester porous microspheres with the pretreatment reaction liquid, fully stirring, pouring into a reaction kettle, heating the reaction kettle to 150 ℃, carrying out heat preservation reaction for 10 hours, cooling to room temperature, filtering out solids, washing with deionized water and ethanol for at least three times in sequence, drying under reduced pressure, and then treating at 180 ℃ for 1 hour to obtain scandium tantalate @ modified polyester microspheres; wherein the mass ratio of the modified polyester porous microspheres to the pretreatment reaction liquid is 1.
The preparation method of the high-temperature-resistant acid-corrosion-resistant coating comprises the following steps:
sequentially weighing the organic silicon resin, the scandium tantalate @ modified polyester microspheres, the inorganic filler and the dispersing agent, mixing and stirring for 1h, then weighing and adding the defoaming agent, the film forming agent and the wetting agent, mixing for 0.5h, then adding the weighed curing agent, and mixing for 0.2 h.
In this embodiment, the high-temperature-resistant acid-corrosion-resistant coating prepared by the method is coated on the surface layer of an aluminum conductor wire with the diameter of 0.5mm in a rotating manner by a spin coater, the coating thickness is 0.06mm, and then the coating is placed in an oven at 150 ℃ for 1 hour after being placed at room temperature for 1 hour and then dried, so that an enameled wire is obtained.
Example 3
A high-temperature-resistant acid-corrosion-resistant coating comprises the following components in parts by weight:
85 parts of organic silicon resin, 15 parts of scandium tantalate @ modified polyester microspheres, 10 parts of inorganic filler, 1 part of dispersing agent, 0.6 part of defoaming agent, 0.8 part of film forming agent, 0.8 part of wetting agent and 0.5 part of curing agent.
The inorganic filler comprises mica powder and talcum powder, the particle sizes are 20-30 mu m, and the mass ratio of the mica powder to the talcum powder is 1; the dispersant is HY-190; the defoaming agent is BYK-141; the wetting agent is Dow Corning DC-501W; the curing agent is triethylene tetramine.
The particle size of the scandium tantalate @ modified polyester microsphere is 30-50 mu m, and the preparation method of the scandium tantalate @ modified polyester microsphere comprises the following steps:
s1, preparation of a pretreatment reaction solution:
mixing tantalum oxalate and scandium chloride in deionized water, fully stirring until the mixture is clear, firstly dropwise adding an ammonium fluoride aqueous solution, uniformly stirring, then dropwise adding a urea aqueous solution, and uniformly stirring again to obtain a pretreatment reaction solution; wherein the mass ratio of the tantalum oxalate to the scandium chloride to the deionized water is 1.36; the mass fraction of the ammonium fluoride aqueous solution is 15%, wherein the mass ratio of ammonium fluoride to tantalum oxalate is 1; the mass fraction of the urea aqueous solution is 25%, wherein the mass ratio of urea to tantalum oxalate is 1.
S2, preparing modified polyester porous microspheres:
(1) weighing terephthalic acid and 1, 4-butanediol, mixing, heating to 160 ℃, stirring for 4 hours, adding a catalyst, heating to 230 ℃, and carrying out polycondensation reaction for 2 hours to obtain polybutylene terephthalate; wherein the mass ratio of terephthalic acid to 1, 4-butanediol is 2.1; the catalyst is tetrabutyl titanate, and the addition amount of the catalyst is 4 percent of that of the terephthalic acid.
(2) Weighing polybutylene terephthalate, nano tantalum carbide powder, polyvinylpyrrolidone and tetrahydrofuran, mixing, uniformly stirring, heating to 70 ℃, carrying out reflux stirring treatment for 4 hours, stopping heating, adding ethanol, continuously stirring until the temperature is reduced to room temperature, filtering out precipitated solids, washing with ethanol for three times, and drying under reduced pressure to obtain modified polyester porous microspheres; wherein the mass ratio of polybutylene terephthalate, polyvinylpyrrolidone and tetrahydrofuran is 2.2; the mass ratio of ethanol to tetrahydrofuran is 1; the mass ratio of the nano tantalum carbide powder to the polybutylene terephthalate is 0.4.
S3, preparing scandium tantalate @ modified polyester microspheres:
mixing the modified polyester porous microspheres with the pretreatment reaction liquid, fully stirring, pouring into a reaction kettle, heating the reaction kettle to 170 ℃, carrying out heat preservation reaction for 18 hours, cooling to room temperature, filtering out solids, washing with deionized water and ethanol for at least three times in sequence, drying under reduced pressure, and then treating at 200 ℃ for 3 hours to obtain scandium tantalate @ modified polyester microspheres; wherein the mass ratio of the modified polyester porous microspheres to the pretreatment reaction liquid is 1.
The preparation method of the high-temperature-resistant acid-corrosion-resistant coating comprises the following steps:
sequentially weighing the organic silicon resin, the scandium tantalate @ modified polyester microspheres, the inorganic filler and the dispersing agent, mixing and stirring for 2 hours, then weighing and adding the defoaming agent, the film forming agent and the wetting agent, mixing for 1 hour again, then adding the weighed curing agent, and mixing for 0.5 hour.
In this embodiment, the high-temperature-resistant acid-corrosion-resistant coating prepared by the method is coated on the surface layer of a copper-aluminum alloy (97% aluminum) conductor wire with the diameter of 1.5mm in a rotating manner by a spin coater, the coating thickness is 0.12mm, and then the coating is placed in an oven at 170 ℃ for 2 hours after being placed at room temperature for 4 hours, so as to obtain an enameled wire.
Comparative example 1
The high-temperature-resistant acid-corrosion-resistant coating comprises the following components in parts by weight as in example 1: and replacing the scandium tantalate @ modified polyester microspheres with modified polyester microspheres.
The composition comprises the following components in parts by weight:
72 parts of organic silicon resin, 13 parts of modified polyester microspheres, 8 parts of inorganic filler, 0.6 part of dispersing agent, 0.4 part of defoaming agent, 0.5 part of film forming agent, 0.6 part of wetting agent and 0.3 part of curing agent.
The particle size of the modified polyester microsphere is 30-50 mu m, and the preparation method of the modified polyester microsphere comprises the following steps:
(1) weighing terephthalic acid and 1, 4-butanediol, mixing, heating to 150 ℃, stirring for 3 hours, adding a catalyst, heating to 220 ℃, and carrying out polycondensation reaction for 1.5 hours to obtain polybutylene terephthalate; wherein the mass ratio of terephthalic acid to 1, 4-butanediol is 1.8; the catalyst is tetrabutyl titanate, and the addition amount of the catalyst is 3 percent of that of the terephthalic acid.
(2) Weighing polybutylene terephthalate, nano tantalum carbide powder, polyvinylpyrrolidone and tetrahydrofuran, mixing, uniformly stirring, heating to 60 ℃, carrying out reflux stirring treatment for 3 hours, stopping heating, simultaneously adding ethanol, continuing stirring until the temperature is reduced to room temperature, filtering out precipitated solids, washing with ethanol for three times, and drying under reduced pressure to obtain modified polyester microspheres; wherein the mass ratio of polybutylene terephthalate, polyvinylpyrrolidone and tetrahydrofuran is 2; the mass ratio of ethanol to tetrahydrofuran is 1; the mass ratio of the nano tantalum carbide powder to the polybutylene terephthalate is 0.3.
The above mentioned high temperature and acid corrosion resistances the preparation method of the coating comprises the following steps:
sequentially weighing the organic silicon resin, the modified polyester microspheres, the inorganic filler and the dispersing agent, mixing and stirring for 2 hours, then weighing and adding the defoaming agent, the film forming agent and the wetting agent, mixing for 1 hour again, then adding the weighed curing agent, and mixing for 0.5 hour.
In this embodiment, the high-temperature-resistant acid-corrosion-resistant coating prepared by the method is coated on the surface layer of a copper conductor wire with the diameter of 1mm in a rotating manner by a spin coater, the coating thickness is 0.1mm, and then the coating is placed in an oven at 160 ℃ for 2 hours after being placed at room temperature for 3 hours, so as to obtain an enameled wire.
Comparative example 2
The high-temperature-resistant and acid-corrosion-resistant coating comprises the following components in the same manner as in example 1, except that: and replacing the scandium tantalate @ modified polyester microspheres with polyester microspheres.
The composition comprises the following components in parts by weight:
72 parts of organic silicon resin, 13 parts of polyester microspheres, 8 parts of inorganic filler, 0.6 part of dispersing agent, 0.4 part of defoaming agent, 0.5 part of film forming agent, 0.6 part of wetting agent and 0.3 part of curing agent.
The inorganic filler comprises mica powder and talcum powder, the particle size is 20-30 mu m, and the mass ratio of the mica powder to the talcum powder is 2; the dispersant is HY-168; the defoaming agent is TEGO-902W; the wetting agent is Dow Corning DC-67; the curing agent is diethylenetriamine.
The particle size of the polyester microsphere is 30-50 μm, and the preparation method of the polyester microsphere comprises the following steps:
(1) weighing terephthalic acid and 1, 4-butanediol, mixing, heating to 150 ℃, stirring for 3 hours, adding a catalyst, heating to 220 ℃, and carrying out polycondensation reaction for 1.5 hours to obtain polybutylene terephthalate; wherein the mass ratio of terephthalic acid to 1, 4-butanediol is 1.8; the catalyst is tetrabutyl titanate, and the addition amount of the catalyst is 3 percent of that of the terephthalic acid.
(2) Weighing polybutylene terephthalate, polyvinylpyrrolidone and tetrahydrofuran, mixing, stirring uniformly, heating to 60 ℃, performing reflux stirring treatment for 3 hours, stopping heating, adding ethanol, continuing stirring until the temperature is reduced to room temperature, filtering out precipitated solids, washing with ethanol for three times, and drying under reduced pressure to obtain polyester microspheres; wherein the mass ratio of polybutylene terephthalate, polyvinylpyrrolidone and tetrahydrofuran is 2; the mass ratio of ethanol to tetrahydrofuran was 1.
The preparation method of the high-temperature-resistant acid-corrosion-resistant coating comprises the following steps:
sequentially weighing the organic silicon resin, the scandium tantalate @ modified polyester microspheres, the inorganic filler and the dispersing agent, mixing and stirring for 2 hours, then weighing and adding the defoaming agent, the film forming agent and the wetting agent, mixing for 1 hour again, then adding the weighed curing agent, and mixing for 0.5 hour.
In this embodiment, the high-temperature-resistant acid-corrosion-resistant coating prepared by the method is coated on the surface layer of a copper conductor wire with the diameter of 1mm in a rotating manner by a spin coater, the coating thickness is 0.1mm, and then the coating is placed in an oven at 160 ℃ for 2 hours after being placed at room temperature for 3 hours, so as to obtain an enameled wire.
In order to more clearly illustrate the content of the present invention, the high temperature resistant, acid corrosion resistant coatings prepared in examples 1 and comparative examples 1-2 of the present invention were tested and compared in terms of performance after being dried (in the same manner as in example 1).
Wherein the detection standard is that the surface hardness is in accordance with GB/T6739-2006; the adhesive force is in accordance with GB/T1720-2020; the flexibility is according to GB/T1731-2020; the water resistance is according to GB/T1733-1993; the salt spray resistance detection is in accordance with GB/T1771-2007; acid corrosion resistance detection is to soak the film in 0.1mol/L sulfuric acid for 7d, and then take out the film to observe the condition of the film; and the alkali-resistant corrosion detection is to soak the film in 0.1mol/L sodium hydroxide for 7d, and then to take out the film to observe the condition of the paint film. The test results are shown in table 1 below:
TABLE 1 comparison of the Properties of different insulating lacquers
As can be seen from Table 1, the high-temperature-resistant and acid-corrosion-resistant coating prepared in example 1 of the present invention has the advantages of good high-temperature resistance and acid corrosion resistance, large surface hardness, good adhesion, good flexibility, good water resistance, etc.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the protection scope of the present invention, although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (10)
1. The high-temperature-resistant acid-corrosion-resistant coating is characterized by comprising the following components in parts by weight:
63-85 parts of organic silicon resin, 10-15 parts of scandium tantalate @ modified polyester microspheres, 6-10 parts of inorganic filler, 0.5-1 part of dispersing agent, 0.2-0.6 part of defoaming agent, 0.3-0.8 part of film forming agent, 0.4-0.8 part of wetting agent and 0.1-0.5 part of curing agent.
2. The high-temperature-resistant acid-corrosion-resistant coating as claimed in claim 1, wherein the high-temperature-resistant acid-corrosion-resistant coating comprises, by weight:
72 parts of organic silicon resin, 13 parts of scandium tantalate @ modified polyester microspheres, 8 parts of inorganic filler, 0.6 part of dispersing agent, 0.4 part of defoaming agent, 0.5 part of film forming agent, 0.6 part of wetting agent and 0.3 part of curing agent.
3. The high-temperature-resistant acid-corrosion-resistant coating as claimed in claim 1, wherein the particle size of the scandium tantalate @ modified polyester microspheres is 30-50 μm.
4. The paint of claim 1, wherein the inorganic filler comprises mica powder and talcum powder, the particle sizes of the mica powder and the talcum powder are both 20-30 μm, and the mass ratio of the mica powder to the talcum powder is 1-2.
5. The paint as claimed in claim 1, wherein the dispersant is one of HY-168, HY-5040 and HY-190.
6. The paint of claim 1, wherein the defoamer is one of TEGO-902W, TEGO-901W, BYK-141.
7. The paint of claim 1, wherein the wetting agent is Dow Corning DC-67 or Dow Corning DC-501W.
8. The high temperature and acid corrosion resistant coating of claim 1, wherein the curing agent is diethylenetriamine and/or triethylenetetramine.
9. The high-temperature-resistant acid-corrosion-resistant coating as claimed in claim 1, wherein the preparation method of the scandium tantalate @ modified polyester microspheres comprises the following steps:
s1, preparation of a pretreatment reaction solution:
mixing tantalum oxalate and scandium chloride in deionized water, fully stirring until the mixture is clear, firstly dropwise adding an ammonium fluoride aqueous solution, uniformly stirring, then dropwise adding a urea aqueous solution, and uniformly stirring again to obtain a pretreatment reaction solution;
s2, preparing modified polyester porous microspheres:
(1) weighing terephthalic acid and 1, 4-butanediol, mixing, heating to 150-160 ℃, stirring for 2-4h, adding a catalyst, heating to 210-230 ℃, and carrying out polycondensation reaction for 1-2h to obtain polybutylene terephthalate;
(2) weighing polybutylene terephthalate, nano tantalum carbide powder, polyvinylpyrrolidone and tetrahydrofuran, mixing, uniformly stirring, heating to 60-70 ℃, carrying out reflux stirring treatment for 2-4h, stopping heating, simultaneously adding ethanol, continuously stirring until the temperature is reduced to room temperature, filtering out precipitated solids, washing with ethanol for three times, and drying under reduced pressure to obtain modified polyester porous microspheres;
s3, preparing scandium tantalate @ modified polyester microspheres:
mixing the modified polyester porous microspheres with the pretreatment reaction liquid, fully stirring, pouring into a reaction kettle, heating the reaction kettle to 150-170 ℃, carrying out heat preservation reaction for 10-18h, cooling to room temperature, filtering out solids, washing with deionized water and ethanol for at least three times in sequence, drying under reduced pressure, and then treating at 180-200 ℃ for 1-3h to obtain scandium tantalate @ modified polyester microspheres.
10. An enameled wire, wherein the enameled wire is obtained by coating the high temperature and acid corrosion resistant coating according to any one of claims 1 to 9 on the surface of a conductor wire and drying the coated wire.
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