CN112430425A - High-heat-resistance polyurethane insulating paint and preparation method thereof - Google Patents
High-heat-resistance polyurethane insulating paint and preparation method thereof Download PDFInfo
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- C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
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Abstract
The invention relates to the technical field of polyurethane, in particular to high heat-resistant polyurethane insulating paint and a preparation method thereof. The polyurethane insulating paint disclosed by the invention can pass a heat-resistant softening breakdown test by a 280 ℃/2 minute constant temperature method, and the operating temperature margin of reflow soldering is greatly improved. The invention has good direct weldability, and has excellent performance of completely welding within 3 seconds at 390 ℃ for an ultra-thick paint film with a bare wire diameter of 0.50mm and a single side thickness of 0.015 mm. In a word, the heat resistance of the polyurethane insulating paint is improved, the excellent direct welding performance is considered, and the practical value of the polyurethane insulating paint is greatly improved.
Description
Technical Field
The invention relates to the technical field of polyurethane, in particular to high-heat-resistance polyurethane insulating paint and a preparation method thereof.
Background
The totally insulated polyurethane enameled wire (FIW for short) has the characteristics of direct welding and only using a single material, so that the totally insulated polyurethane enameled wire is more competitive to the application of the traditional PET/nylon/teflon three-layer insulated enameled wire to the production of transformers, and the market has been gradually developed in recent years, and the currently marketed FIW insulated paint mainly has the following two disadvantages:
1. the temperature resistance grade of a commercially available countermeasure is mostly 180 ℃, the temperature resistance grade is mainly related to resin components, and if the working temperature of the manufactured transformer is higher than the temperature, the resin molecules of a paint film begin to have fluidity, so that the insulation protection effect is lost. Therefore, for a high-power transformer, the service life of the transformer can be prolonged by using the product of the invention with the temperature resistance level of 200 ℃.
2. Most commercially available challenges pass the 265 ℃/2 minute constant temperature softening resistance breakdown test only, limiting the operable temperature for reflow soldering, and generally sacrificing straight-through solderability if the softening resistance is to be improved.
Disclosure of Invention
The invention aims to provide a high heat-resistant polyurethane insulating paint and a preparation method thereof aiming at the defects in the prior art, wherein the high heat-resistant polyurethane insulating paint has the temperature resistance level of more than 200 ℃, has excellent heat-resistant softening breakdown performance, and has the characteristics of good direct welding property, high voltage resistance and the like.
The purpose of the invention is realized by the following technical scheme:
a high heat-resistant polyurethane insulating paint is prepared from the following raw materials in parts by weight:
20-40 parts of polyester polyol
20-60 parts of blocked isocyanate
6-32 parts of modified temperature-resistant resin
10-60 parts of mixed solvent
0.1-5 parts of catalyst.
A preparation method of high heat-resistant polyurethane insulating paint comprises the following steps:
the method comprises the following steps: respectively synthesizing a polyester polyol solution and a blocked isocyanate solution;
the specific preparation method of the polyester polyol solution comprises the following steps: and (3) mixing the components in a mass ratio of 1: (0.3-2): (0.2-3): (0.2-3): (0.2-3) putting trimellitic anhydride, diamine, dibasic acid, dihydric alcohol and trihydric alcohol (ester) into a reaction kettle, and adding a cresol solvent with the solid content of 5-15%; then heating to 160-170 ℃ and keeping the temperature for reaction for 2-4 hours; when the dehydration amount reaches 80% of the theoretical amount, slowly raising the temperature to 210-240 ℃, and carrying out the temperature-holding reaction for 4-6 hours to complete the esterification reaction; finally, cooling to 180 ℃, adding a mixed solvent, and preparing into a polyester polyol solution with the solid content of 40-50%; during the reaction, a large amount of water vapor is generated and is cooled to a water collecting bottle through a condenser, and the dehydration amount is obtained by weighing.
The specific preparation method of the blocked isocyanate solution comprises the following steps: adding diisocyanate into a sealing agent, slowly heating to 140-160 ℃, and reacting for 1-3 hours at the constant temperature; then cooling to 140 ℃ of 120-: 1: (0-0.3): (0-0.3): (0.3-1), and the dosage of the catalyst is 0.01-0.5 percent of the total mass of reactants.
Secondly, mixing the polyester polyol solution, the closed isocyanate solution, the modified temperature-resistant resin and the mixed solvent according to the mass ratio of 1: 1-1.5: 0.3-0.8): (1.0-3.0) putting the mixture into a reaction kettle, heating the mixture to 70-100 ℃, keeping the temperature, stirring the mixture for 1-3 hours, cooling the mixture to below 50 ℃, adding a catalyst accounting for 0.1-5 percent of the total mass of reactants, and filtering the mixture to obtain the high-heat-resistant polyurethane insulating paint.
Wherein the dibasic acid is one or more of succinic acid (BA), Adipic Acid (AA), Azelaic acid (Azelaic acid), Sebacic Acid (SA), Phthalic Anhydride (PA), terephthalic acid (TPA), isophthalic acid (IPA) and Maleic Acid (MA).
Wherein the dihydric alcohol is one or a mixture of two or more of Ethylene Glycol (EG), 1, 3-propanediol (1,3-PG), 1, 2-propanediol (1,2-PG), 1, 4-butanediol (1,4-BG), diethylene glycol (DEG), neopentyl glycol (NPG), 2-methyl-1, 3-propanediol (1,3-MPD), Hexanediol (HG), and 3-methyl-1, 5-pentanediol (1, 5-MPD).
Wherein the triol (ester) is one or more of Glycerol (GL), tris (hydroxyethyl) isocyanurate (THEIC) and 1,1, 1-Trimethylolpropane (TMP).
Wherein the diamine is one or more of Ethylenediamine (EDA), Propylenediamine (PDA), Hexamethylenediamine (HDA), p-Phenylenediamine (p-Phenylenediamine), 4' -diaminodiphenylamine and 4, 4-diaminodiphenylmethane.
Wherein the blocking agent is one or a mixture of more than two of Phenol (Phenol), Cresol (Cresol) and Xylenol (Xylenol).
Wherein the modified temperature-resistant resin is one or a mixture of more than two of phenolic resin, epoxy resin, butanone-blocked polyisocyanate, phenol-blocked polyisocyanate and caprolactam-blocked polyisocyanate.
Wherein the mixed solvent is a mixed solvent of a phenol solvent and a benzene solvent with the mass ratio of (5-8) to (2-5).
Wherein the phenolic solvent is one or a mixture of more than two of phenol, cresol, xylenol and trimethylphenol, and the benzene solvent is one or a mixture of more than two of toluene, xylene and trimethylbenzene.
Wherein the catalyst is one or a mixture of more than two of tetrabutyl titanate, titanium tetraisopropoxide, butyl stannic acid, triethylamine, zinc naphthenate, zinc isooctanoate, cobalt manganese catalyst, imidazole catalyst and N-methyl-sylvite.
Wherein the catalyst is one or a mixture of more than two of tetrabutyl titanate, titanium tetraisopropoxide, butyl stannic acid, triethylamine, zinc naphthenate, zinc isooctanoate, cobalt manganese catalyst, imidazole catalyst and N-methyl-sylvite.
The invention has the beneficial effects that: according to the invention, the polyurethane insulating paint with the temperature resistance level of 200 ℃ is prepared by introducing the high-heat-resistant blocked polyisocyanate and the polyester polyol, and the polyurethane insulating paint is more suitable for being applied to high-power transformers than countermeasures in the market. The polyurethane insulating paint disclosed by the invention can pass a heat-resistant softening breakdown test by a 280 ℃/2 minute constant temperature method, and the operating temperature margin of reflow soldering is greatly improved. The invention has good direct weldability, and has excellent performance of completely welding within 3 seconds at 390 ℃ for an ultra-thick paint film with a bare wire diameter of 0.50mm and a single side thickness of 0.015 mm. In conclusion, the heat resistance of the polyurethane insulating paint is improved, the excellent direct welding performance is considered, and the practical value of the polyurethane insulating paint is greatly improved.
Detailed Description
The invention is further described with reference to the following examples.
Example 1
A preparation method of high heat-resistant polyurethane insulating paint comprises the following steps:
the method comprises the following steps: respectively synthesizing a polyester polyol solution and a blocked isocyanate solution;
the specific preparation method of the polyester polyol solution comprises the following steps: and (3) mixing the components in a mass ratio of 1: 0.3: 0.2: 0.4: 0.4 of trimellitic anhydride, diamine, dibasic acid, dihydric alcohol and trihydric alcohol (ester) are put into a reaction kettle together, and cresol solvent with the solid content of 5 percent is added; then heating to 160 ℃ and holding the temperature for reaction for 2 hours; when the dehydration amount reaches 80% of the theoretical amount, slowly heating to 210 ℃, and keeping the temperature for reaction for 6 hours to complete the esterification reaction; finally, cooling to 180 ℃, adding a mixed solvent, and preparing into a polyester polyol solution with the solid content of 40%;
the specific preparation method of the blocked isocyanate solution comprises the following steps: adding diisocyanate into a sealing agent, slowly heating to 140 ℃, and reacting for 3 hours at a constant temperature; cooling to 120 ℃, adding dihydric alcohol, trihydric alcohol (ester) and a catalyst, keeping the temperature for reaction for 4 hours, finishing the reaction when the free NCO% is less than 0.4%, cooling to 170 ℃, adding a mixed solvent, and adjusting the solid content to 40%, wherein the mass ratio of diisocyanate, dihydric alcohol, trihydric alcohol (ester) and a sealing agent is equal to: 1: 0.1: 0.1: 0.8, and the dosage of the catalyst is 0.05 percent of the total mass of reactants.
Secondly, mixing the polyester polyol solution, the closed isocyanate solution, the modified temperature-resistant resin and the mixed solvent according to the mass ratio of 1: 0.3: 2, putting the mixture into a reaction kettle, heating the mixture to 70 ℃, keeping the temperature and stirring the mixture for 3 hours, cooling the mixture to below 50 ℃, adding a catalyst accounting for 0.3 percent of the total mass of reactants, and filtering the mixture to obtain the high-heat-resistance polyurethane insulating paint.
Wherein the dibasic acid is Phthalic Anhydride (PA) and Adipic Acid (AA) in a mass ratio of 1: 1.
Wherein the dihydric alcohol is Ethylene Glycol (EG) and 1, 3-propylene glycol (1,3-PG) in a mass ratio of 1: 1.
Wherein the triol (ester) is tris (-hydroxyethyl) isocyanurate (THEIC).
Wherein the diamine is Ethylenediamine (EDA).
Wherein the blocking agent is Cresol (Cresol).
Wherein the modified temperature-resistant resin is epoxy resin.
Wherein the mixed solvent is a mixed solvent of phenol and toluene with a mass ratio of 8: 2.
The catalyst is tetrabutyl titanate.
Example 2
A preparation method of high heat-resistant polyurethane insulating paint comprises the following steps:
the method comprises the following steps: respectively synthesizing a polyester polyol solution and a blocked isocyanate solution;
the specific preparation method of the polyester polyol solution comprises the following steps: and (3) mixing the components in a mass ratio of 1: 0.6: 0.8: 1: 0.5 of trimellitic anhydride, diamine, dibasic acid, dihydric alcohol and trihydric alcohol (ester) are put into a reaction kettle together, and cresol solvent with the solid content of 10 percent is added; then heating to 165 ℃ and holding the temperature for reaction, wherein the reaction time is 3 hours; when the dehydration amount reaches 80% of the theoretical amount, slowly heating to 220 ℃, and keeping the temperature for reaction for 5 hours to complete the esterification reaction; and finally, cooling to 180 ℃, adding a mixed solvent, and preparing into a polyester polyol solution with the solid content of 45%.
The specific preparation method of the blocked isocyanate solution comprises the following steps: adding diisocyanate into a sealing agent, slowly heating to 150 ℃, and reacting for 2 hours at a constant temperature; cooling to 130 ℃, adding dihydric alcohol, trihydric alcohol (ester) and a catalyst, keeping the temperature for reaction for 3 hours, finishing the reaction when the free NCO percent is less than 0.4 percent, cooling to 180 ℃, adding a mixed solvent, and adjusting the solid content to 45 percent, wherein the mass ratio of diisocyanate, dihydric alcohol, trihydric alcohol (ester) and a sealing agent is equal to: 1: 0.2: 0.2: 0.5, and the dosage of the catalyst is 0.1 percent of the total mass of reactants.
Secondly, mixing the polyester polyol solution, the closed isocyanate solution, the modified temperature-resistant resin and the mixed solvent according to the mass ratio of 1: 1.2: 0.5: 2, putting the mixture into a reaction kettle, heating the mixture to 90 ℃, keeping the temperature and stirring the mixture for 2 hours, cooling the mixture to below 50 ℃, adding a catalyst accounting for 1 percent of the total mass of reactants, and filtering the mixture to obtain the high-heat-resistance polyurethane insulating paint.
Wherein the dibasic acid is prepared from the following components in a mass ratio of 2:1 Adipic Acid (AA), terephthalic acid (TPA).
Wherein the dihydric alcohol is 1, 3-propanediol (1, 3-PG).
Wherein the triol (ester) is tris (-hydroxyethyl) isocyanurate (THEIC).
Wherein the diamine is Hexamethylene Diamine (HDA).
Wherein the sealing agent is prepared from the following components in a mass ratio of 1:2 (Phenol) and Cresol (Cresol).
Wherein the modified temperature-resistant resin is phenolic resin.
Wherein the mixed solvent is cresol and toluene mixed solvent with the mass ratio of 7: 3.
The catalyst is prepared from the following components in a mass ratio of 2:1 zinc isooctanoate, cobalt manganese catalyst.
Example 3
A preparation method of high heat-resistant polyurethane insulating paint comprises the following steps:
the method comprises the following steps: respectively synthesizing a polyester polyol solution and a blocked isocyanate solution;
the specific preparation method of the polyester polyol solution comprises the following steps: and (3) mixing the components in a mass ratio of 1: 1.5: 3: 1.5: 1.5, putting trimellitic anhydride, diamine, dibasic acid, dihydric alcohol and trihydric alcohol (ester) into a reaction kettle, and adding a cresol solvent with the solid content of 15 percent; then heating to 170 ℃ and holding the temperature for reaction for 2 hours; when the dehydration amount reaches 80% of the theoretical amount, slowly heating to 240 ℃, and keeping the temperature for reaction for 4 hours to complete the esterification reaction; finally, cooling to 180 ℃, adding a mixed solvent, and preparing into a polyester polyol solution with the solid content of 50%;
the specific preparation method of the blocked isocyanate solution comprises the following steps: adding diisocyanate into a sealing agent, slowly heating to 160 ℃, and reacting for 1 hour at the constant temperature; cooling to 140 ℃, adding dihydric alcohol, trihydric alcohol (ester) and a catalyst, keeping the temperature for reaction for 2 hours, finishing the reaction when the free NCO% is less than 0.4%, cooling to 190 ℃, adding a mixed solvent, and adjusting the solid content to 60%, wherein the mass ratio of diisocyanate, dihydric alcohol, trihydric alcohol (ester) and a sealing agent is equal to: 1: 0.15: 0.15: 1, the dosage of the catalyst is 0.5 percent of the total mass of reactants.
And step two, putting the polyester polyol solution, the closed isocyanate solution, the modified temperature-resistant resin and the mixed solvent into a reaction pot according to the mass ratio of 1: 1.5: 0.8:3, heating to 100 ℃, keeping the temperature and stirring for 1 hour, cooling to below 50 ℃, adding a catalyst accounting for 0.5 percent of the total mass of reactants, and filtering to obtain the high-heat-resistant polyurethane insulating paint.
Wherein the dibasic acid is Phthalic Anhydride (PA) and isophthalic acid (IPA) in a mass ratio of 1: 1.
Wherein the diol is neopentyl glycol (NPG).
Wherein the triol (ester) is 1,1, 1-Trimethylolpropane (TMP).
Wherein the diamine is p-phenylene diamine (p-phenylene diamine).
Wherein the sealing agent is prepared from the following components in a mass ratio of 1:2 Cresol (Cresol), Xylenol (Xylenol).
Wherein the modified temperature-resistant resin is phenol-blocked polyisocyanate.
Wherein the mixed solvent is a mixed solvent of xylenol and toluene with the mass ratio of 1: 1.
The catalyst is a mixture of titanium tetraisopropoxide and zinc isooctanoate in a mass ratio of 1: 1.
Example 4
A preparation method of high heat-resistant polyurethane insulating paint comprises the following steps:
the method comprises the following steps: respectively synthesizing a polyester polyol solution and a blocked isocyanate solution;
the specific preparation method of the polyester polyol solution comprises the following steps: and (3) mixing the components in a mass ratio of 1: 1: 2: 1.2: 1, putting trimellitic anhydride, diamine, dibasic acid, dihydric alcohol and trihydric alcohol (ester) into a reaction kettle, and adding a cresol solvent with the solid content of 8%; then heating to 165 ℃ and holding the temperature for reaction, wherein the reaction time is 3 hours; when the dehydration amount reaches 80% of the theoretical amount, slowly heating to 230 ℃, and keeping the temperature for reaction for 5 hours to complete the esterification reaction; finally, cooling to 180 ℃, adding a mixed solvent, and preparing into a polyester polyol solution with solid content of 48%;
the specific preparation method of the blocked isocyanate solution comprises the following steps: adding diisocyanate into a sealing agent, slowly heating to 155 ℃, and reacting for 2 hours at a constant temperature; then cooling to 138 ℃, adding dihydric alcohol, trihydric alcohol (ester) and a catalyst, keeping the temperature for reaction for 3 hours, finishing the reaction when the free NCO% is less than 0.4%, cooling to 170 ℃, adding a mixed solvent, and adjusting the solid content to 56%, wherein the mass ratio of diisocyanate, dihydric alcohol, trihydric alcohol (ester) and a sealing agent is equal to: 1: 0.1: 0.2: 0.8, and the dosage of the catalyst is 0.3 percent of the total mass of reactants.
Secondly, mixing the polyester polyol solution, the closed isocyanate solution, the modified temperature-resistant resin and the mixed solvent according to the mass ratio of 1: 1.5: 0.5: 2, putting the mixture into a reaction kettle, heating the mixture to 95 ℃, keeping the temperature, stirring the mixture for 1.5 hours, cooling the mixture to below 50 ℃, adding a catalyst accounting for 0.25 percent of the total mass of reactants, and filtering the mixture to obtain the high heat-resistant polyurethane insulating paint.
Wherein the dibasic acid is a mixture of Adipic Acid (AA) and isophthalic acid (IPA) in a mass ratio of 1: 1.
Wherein the dihydric alcohol is 2-methyl-1, 3-propanediol (1, 3-MPD).
Wherein the triol (ester) is Glycerol (GL).
Wherein the diamine is a mixture of Ethylenediamine (EDA) and 4,4' -diaminodiphenylamine in a mass ratio of 1: 1.
The sealing agent is a mixture of Cresol (Cresol) and Xylenol (Xylenol) in a mass ratio of 1: 1.
Wherein the modified temperature-resistant resin is caprolactam-blocked polyisocyanate.
Wherein the mixed solvent is a mixed solvent of phenol and trimethylbenzene with the mass ratio of 7: 3.
The catalyst is tetrabutyl titanate and zinc naphthenate with the mass ratio of 2: 1.
Example 5
A preparation method of high heat-resistant polyurethane insulating paint comprises the following steps:
the method comprises the following steps: respectively synthesizing a polyester polyol solution and a blocked isocyanate solution;
the specific preparation method of the polyester polyol solution comprises the following steps: and (3) mixing the components in a mass ratio of 1: 0.7: 1: 1: 1.5, putting trimellitic anhydride, diamine, dibasic acid, dihydric alcohol and trihydric alcohol (ester) into a reaction kettle, and adding a cresol solvent with the solid content of 9 percent; then heating to 163 ℃ and maintaining the temperature for reaction for 2 hours; when the dehydration amount reaches 80% of the theoretical amount, slowly heating to 220 ℃, and keeping the temperature for reaction for 5 hours to complete the esterification reaction; finally, cooling to 180 ℃, adding a mixed solvent, and preparing into a polyester polyol solution with the solid content of 45%;
the specific preparation method of the blocked isocyanate solution comprises the following steps: adding diisocyanate into a sealing agent, slowly heating to 155 ℃, and reacting for 2 hours at a constant temperature; cooling to 130 ℃, adding dihydric alcohol, trihydric alcohol (ester) and a catalyst, keeping the temperature for reaction for 3 hours, finishing the reaction when the free NCO percent is less than 0.4 percent, cooling to 180 ℃, adding a mixed solvent, and adjusting the solid content to 55 percent, wherein the mass ratio of diisocyanate, dihydric alcohol, trihydric alcohol (ester) and a sealing agent is equal to: 1: 0.3: 0.3: 1, the dosage of the catalyst is 0.3 percent of the total mass of reactants.
Secondly, mixing the polyester polyol solution, the closed isocyanate solution, the modified temperature-resistant resin and the mixed solvent according to the mass ratio of 1: 0.8: 2, putting the mixture into a reaction kettle, heating the mixture to 88 ℃, keeping the temperature and stirring the mixture for 2 hours, cooling the mixture to below 50 ℃, adding a catalyst accounting for 1 percent of the total mass of reactants, and filtering the mixture to obtain the high heat-resistant polyurethane insulating paint.
Wherein the dibasic acid is succinic acid (BA) and Phthalic Anhydride (PA) in a mass ratio of 1: 2.
Wherein the diol of the polyester polyol solution is Ethylene Glycol (EG), and the diol of the blocked isocyanate solution is 2-methyl-1, 3-propanediol (1, 3-MPD).
Wherein the triol (ester) of the polyester polyol solution is Glycerol (GL) and the triol (ester) of the blocked isocyanate solution is tris (-hydroxyethyl) isocyanurate (THEIC).
The diamine is Hexamethylene Diamine (HDA) and p-phenylene diamine (p-phenylene diamine) in a mass ratio.
Wherein the blocking agent is Cresol (Cresol).
Wherein the modified temperature-resistant resin is butanone-sealed polyisocyanate.
Wherein the mixed solvent is a mixed solvent of cresol and xylene with a mass ratio of 6: 4.
The catalyst in the first step is tetrabutyl titanate, and the catalyst in the second step is zinc naphthenate.
The experimental data for inventive examples 1-5 are given in the following table:
as can be seen from the table, all the embodiments of the polyurethane insulating paint can pass the heat-resistant softening breakdown test of the 280 ℃/2 minute constant temperature method, and the operation temperature margin of reflow soldering is greatly improved. The invention has good direct weldability, and has excellent performance of completely welding within 3 seconds at 390 ℃ for an ultra-thick paint film with a bare wire diameter of 0.50mm and a single side thickness of 0.015 mm. In conclusion, the heat resistance of the polyurethane insulating paint is improved, the excellent direct welding performance is considered, and the practical value of the polyurethane insulating paint is greatly improved.
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. A high heat-resistant polyurethane insulating paint is characterized in that: the traditional Chinese medicine is prepared from the following raw materials in parts by weight:
20-40 parts of polyester polyol
20-60 parts of blocked isocyanate
6-32 parts of modified temperature-resistant resin
10-60 parts of mixed solvent
0.1-5 parts of catalyst.
2. A preparation method of high heat-resistant polyurethane insulating paint is characterized by comprising the following steps: the method comprises the following steps:
the method comprises the following steps: respectively synthesizing a polyester polyol solution and a blocked isocyanate solution;
the specific preparation method of the polyester polyol solution comprises the following steps: and (3) mixing the components in a mass ratio of 1: (0.3-2): (0.2-3): (0.2-3): (0.2-3) putting trimellitic anhydride, diamine, dibasic acid, dihydric alcohol and trihydric alcohol (ester) into a reaction kettle, and adding cresol with the solid content of 5-15%; then heating to 160-170 ℃ and maintaining the temperature for reaction, wherein the reaction time is 2-4 hours, when the dehydration amount reaches 80% of the theoretical amount, heating to 210-240 ℃, and maintaining the temperature for reaction for 4-6 hours to complete the esterification reaction; finally, cooling to 180 ℃, adding a mixed solvent, and preparing into a polyester polyol solution with the solid content of 40-50%;
the specific preparation method of the blocked isocyanate solution comprises the following steps: adding diisocyanate into a sealing agent, raising the temperature to 140-160 ℃, and reacting for 1-3 hours at the constant temperature; then cooling to 140 ℃ of 120-: 1: (0-0.3): (0-0.3): (0.3-1), wherein the using amount of the catalyst is 0.01-0.5 percent of the total mass of reactants;
secondly, mixing the polyester polyol solution, the closed isocyanate solution, the modified temperature-resistant resin and the mixed solvent according to the mass ratio of 1: 1-1.5: 0.3-0.8): (1.0-3.0) putting the mixture into a reaction kettle, heating the mixture to 70-100 ℃, keeping the temperature, stirring the mixture for 1-3 hours, cooling the mixture to below 50 ℃, adding a catalyst accounting for 0.1-5 percent of the total mass of reactants, and filtering the mixture to obtain the high-heat-resistant polyurethane insulating paint.
3. The method for preparing a high heat-resistant polyurethane insulating varnish according to claim 2, wherein: the dibasic acid is one or more of succinic acid (BA), Adipic Acid (AA), Azelaic acid (Azelaic acid), Sebacic Acid (SA), Phthalic Anhydride (PA), terephthalic acid (TPA), isophthalic acid (IPA) and Maleic Acid (MA).
4. The method for preparing a high heat-resistant polyurethane insulating varnish according to claim 2, wherein: the dihydric alcohol is one or a mixture of more than two of Ethylene Glycol (EG), 1, 3-propanediol (1,3-PG), 1, 2-propanediol (1,2-PG), 1, 4-butanediol (1,4-BG), diethylene glycol (DEG), neopentyl glycol (NPG), 2-methyl-1, 3-propanediol (1,3-MPD), Hexanediol (HG) and 3-methyl-1, 5-pentanediol (1, 5-MPD).
5. The method for preparing a high heat-resistant polyurethane insulating varnish according to claim 2, wherein: the triol (ester) is one or more of Glycerol (GL), tris (hydroxyethyl) isocyanurate (THEIC) and 1,1, 1-Trimethylolpropane (TMP).
6. The method for preparing a high heat-resistant polyurethane insulating varnish according to claim 2, wherein: the diamine is one or more of Ethylenediamine (EDA), Propylenediamine (PDA), Hexamethylenediamine (HDA), p-Phenylenediamine (p-Phenylenediamine), 4' -diaminodiphenylamine and 4, 4-diaminodiphenylmethane.
7. The method for preparing a high heat-resistant polyurethane insulating varnish according to claim 2, wherein: the blocking agent is one or a mixture of more than two of Phenol (Phenol), Cresol (Cresol) and Xylenol (Xylenol).
8. The method for preparing a high heat-resistant polyurethane insulating varnish according to claim 1 or 2, wherein: the modified temperature-resistant resin is one or a mixture of more than two of phenolic resin, epoxy resin, butanone-blocked polyisocyanate, phenol-blocked polyisocyanate and caprolactam-blocked polyisocyanate.
9. The method for preparing a high heat-resistant polyurethane insulating varnish according to claim 1 or 2, wherein: the mixed solvent is a mixed solvent of phenol and benzene with the mass ratio of (5-8) to (2-5).
10. The method for preparing a high heat-resistant polyurethane insulating varnish according to claim 1 or 2, wherein: the catalyst is one or a mixture of more than two of tetrabutyl titanate, titanium tetraisopropoxide, butyl stannic acid, triethylamine, zinc naphthenate, zinc isooctanoate, cobalt manganese catalyst, imidazole catalyst and N-methyl-sylvite.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01225677A (en) * | 1988-03-07 | 1989-09-08 | Dainichiseika Color & Chem Mfg Co Ltd | Insulated wire capable of being soldered |
| JP2012144679A (en) * | 2011-01-14 | 2012-08-02 | Auto Kagaku Kogyo Kk | Reactive polyurethane-based electrical insulating coating material and insulated electric wire with insulating layer of the electrical insulating coating material |
| CN107987714A (en) * | 2017-11-23 | 2018-05-04 | 东莞宏石功能材料科技有限公司 | A kind of high thermal polyurethane insulated paint and preparation method thereof |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01225677A (en) * | 1988-03-07 | 1989-09-08 | Dainichiseika Color & Chem Mfg Co Ltd | Insulated wire capable of being soldered |
| JP2012144679A (en) * | 2011-01-14 | 2012-08-02 | Auto Kagaku Kogyo Kk | Reactive polyurethane-based electrical insulating coating material and insulated electric wire with insulating layer of the electrical insulating coating material |
| CN107987714A (en) * | 2017-11-23 | 2018-05-04 | 东莞宏石功能材料科技有限公司 | A kind of high thermal polyurethane insulated paint and preparation method thereof |
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