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CN-118421191-B - High-temperature-resistant chemical-corrosion-resistant insulating paint, enameled wire and preparation method

CN118421191BCN 118421191 BCN118421191 BCN 118421191BCN-118421191-B

Abstract

The invention relates to the technical field of enameled wires, in particular to high-temperature-resistant chemical-corrosion-resistant insulating varnish, an enameled wire and a preparation method. The insulating paint with high temperature resistance and chemical corrosion resistance consists of polyimide resin 45-65 wt%, fluoridated polyimide 8.0-20 wt%, aromatic amine curing agent 5.0-15 wt%, dimethylformamide 10-30 wt%, hexagonal boron nitride 5.0-10.0 wt%, nanometer alumina 3.0-10 wt%, nanometer silica 2.0-5.0 wt%, dispersant 0.5-2.0 wt% and defoaming agent 0.2-1.5 wt%. The invention can prepare the insulating paint with excellent performance by adopting polyimide and fluorinated polyimide resin and combining nano-filler and optimized preparation process, and is widely applied to the fields of aerospace, electric automobiles, industrial motors, transformers, electronic and electric equipment and the like, thereby providing reliable insulation protection for the applications with high requirements.

Inventors

  • FANG XIAOYAN

Assignees

  • 浙江优耐特新材料有限公司

Dates

Publication Date
20260505
Application Date
20240527

Claims (8)

  1. 1. The high-temperature-resistant chemical-corrosion-resistant wire enamel is characterized by comprising the following components in percentage by mass: Polyimide resin 50% Fluorinated polyimide 10% 10% Of aromatic amine curing agent Dimethylformamide 20% Hexagonal boron nitride 5% Nano alumina 2% Nano silicon dioxide 2% Dispersant 0.5% 0.5% Of defoaming agent; the aromatic amine curing agent is 4,4' -diaminodiphenyl methane.
  2. 2. The high-temperature-resistant chemical-corrosion-resistant wire enamel is characterized by comprising the following components in percentage by mass: Polyimide resin 47% Fluorinated polyimide 12% 10% Of aromatic amine curing agent Dimethylformamide 23% Hexagonal boron nitride 5% Nano alumina 1.5% Nano silicon dioxide 0.5% Dispersant 0.5% 0.5% Of defoaming agent; the aromatic amine curing agent is 4,4' -diaminodiphenyl methane.
  3. 3. The high-temperature-resistant chemical-corrosion-resistant wire enamel is characterized by comprising the following components in percentage by mass: Polyimide resin 49% Fluorinated polyimide 11% 10% Of aromatic amine curing agent Dimethylformamide 20% 6% Of hexagonal boron nitride Nano alumina 2% Nano silicon dioxide 1% Dispersant 0.5% 0.5% Of defoaming agent; the aromatic amine curing agent is 4,4' -diaminodiphenyl methane.
  4. 4. The wire enamel of claims 1-3 wherein the dispersant is selected from the group consisting of BYK-110, disperbyk-180, TEGO Dispers 750W, solsperse 20000, and the defoamer is selected from the group consisting of BYK-024, TEGO Airex, foamaster NO 2331, deefo 2150.
  5. 5. The wire enamel with high temperature and chemical resistance according to any one of claims 1 to 3, wherein the nano silica has a surface area of 100 to 300m 2/g, the surface is treated with organosilane, and the nano alumina has an average particle size of 10 to 50 nm.
  6. 6. A method for preparing a high temperature and chemical corrosion resistant wire enamel according to any of claims 1 to 5, comprising the steps of: 1) Mixing of resin matrix and solvent Mixing polyimide resin and fluorinated polyimide together in proportion, adding dimethylformamide as solvent, stirring at room temperature for 2 hours by using a stirrer to ensure that the resin matrix is completely dissolved in the solvent; 2) Adding a curing agent Slowly adding aromatic amine curing agent into the resin solution, and continuously stirring for 1 hour to ensure that the curing agent is completely dissolved and uniformly distributed; 3) Adding auxiliary agent Stirring for 30 minutes at room temperature by using a stirrer to ensure that the auxiliary agent is uniformly dispersed in the solution; 4) Adding filler Sequentially adding nano aluminum oxide, nano silicon dioxide and hexagonal boron nitride according to a proportion, dispersing for 1 hour at a speed of 2000 rpm by using high-shear dispersing equipment, ensuring that nano fillers are uniformly distributed in a solution, and avoiding agglomeration; 5) Degassing treatment The mixed solution was placed in a vacuum degasser and degassed under a vacuum of-0.09 MPa for 30 minutes to remove air bubbles from the solution and ensure uniformity and integrity of the paint film during coating.
  7. 7. A high-temperature-resistant and chemical-corrosion-resistant enameled wire is characterized in that the insulating varnish of the enameled wire is 1-5.
  8. 8. The method for preparing the enameled wire according to claim 7, characterized in that the method comprises the following steps: 1) Coating The prepared paint is uniformly coated on an enamelling wire by using dip coating, spray coating or rolling coating processes, the coating speed is controlled to be 5-10 m/min, the thickness of a paint film is controlled to be 20-25 mu m, and the uniformity of the coating is ensured; 2) Curing The coated enameled wire is placed in an oven, and is gradually heated to be solidified according to the following temperature program, wherein the temperature is kept at 100 ℃ for 1 hour, 150 ℃ for 1 hour, 200 ℃ for 1 hour, 250 ℃ for 1 hour and 300 ℃ for 2 hours; 3) Cooling and post-treatment After solidification, the enameled wire is naturally cooled to room temperature, so that stress concentration and paint film cracking caused by rapid cooling are avoided.

Description

High-temperature-resistant chemical-corrosion-resistant insulating paint, enameled wire and preparation method Technical Field The invention relates to the technical field of enameled wires, in particular to high-temperature-resistant chemical-corrosion-resistant insulating varnish, an enameled wire and a preparation method. Background Enameled wires, which are key materials widely used in motors, electric appliances, transformers and electronic equipment, have properties that directly affect the reliability and life of the equipment. The core of the enameled wire is an insulating paint layer, and the paint layer is required to have excellent insulating performance, high mechanical strength, high heat resistance and high adhesive force so as to ensure long-term stable operation under various complex working conditions. In modern industry and technical development, the high temperature environment is increasingly demanding on materials. Many critical devices and systems, such as aerospace engines, electric car motors, industrial motors, transformers, etc., must operate stably for long periods of time in high temperature environments. The normal operation of these devices relies on good quality insulation materials that maintain their insulating properties and mechanical strength at high temperatures. Traditional insulating paint materials, such as polyester paint and polyurethane paint, perform well in medium and low temperature environments, but are easy to thermally degrade in high temperature environments, so that the insulating performance is obviously reduced, and even potential safety hazards are caused. Therefore, development of an insulating paint material capable of stably operating in a high-temperature environment has become an urgent need. In addition, in many industrial applications, the equipment is required to not only cope with high temperatures, but also to resist various chemical corrosive environments. For example, in chemical plants, ocean engineering, nuclear power plants, and the like, equipment is exposed to corrosive substances such as acids, alkalis, solvents, and salt mist. These corrosive substances can cause serious damage to conventional insulating paints, leading to insulation failure, and further affecting the safety and reliability of the equipment. Therefore, the insulating paint is required to have not only excellent high temperature resistance but also excellent chemical corrosion resistance to ensure long-term stable operation in a severe chemical environment. Disclosure of Invention In order to solve the technical problems, the invention aims to provide the insulating paint with high temperature resistance and chemical corrosion resistance, and the insulating paint with excellent performance can be prepared by adopting polyimide and fluorinated polyimide resin and combining nano-filler and an optimized preparation process, and is widely applied to the fields of aerospace, electric automobiles, industrial motors, transformers, electronic and electric equipment and the like, so that reliable insulating protection is provided for the applications with high requirements. In order to achieve the above purpose, the present invention adopts the following technical scheme: The insulating paint with high temperature resistance and chemical corrosion resistance comprises the following components in percentage by mass: 45-65% of polyimide resin 8.0 To 20 percent of fluorinated polyimide 5.0-15% Of aromatic amine curing agent Dimethylformamide 10-30% 5.0 To 10.0 percent of hexagonal boron nitride 3.0 To 10 percent of nano alumina 2.0 To 5.0 percent of nano silicon dioxide 0.5 To 2.0 percent of dispersing agent 0.2 To 1.5 percent of defoaming agent. Preferably, the insulating paint comprises the following components in percentage by mass: Polyimide resin 40-55% 10 To 15 percent of fluorinated polyimide 8.0 To 12 percent of aromatic amine curing agent Dimethylformamide 12-25% 6.0 To 8.0 percent of hexagonal boron nitride 4.0 To 8.0 percent of nano alumina 2.0 To 4.0 percent of nano silicon dioxide 1.0 To 1.5 percent of dispersing agent 0.3 To 1.0 percent of defoaming agent. Preferably, the fluorinated polyimide is one of DuPont Kapton FPI, suzhou chemical industry Co., ltd LFPI-80 and Kemu eflon FEP-PI. Preferably, the aromatic amine curing agent is one of 4,4 '-diaminodiphenyl methane (DDM), m-phenylenediamine, 4' -diaminodiphenyl methane-4, 4 '-diamine (DDM), 1, 3-diaminobenzene (MDA) and 4,4' -diaminodiphenyl sulfide (DDS). Preferably, the dispersing agent is selected from one of BYK-110, disperbyk-180, TEGO Dispers 750W and Solsperse 20000, and the defoaming agent is selected from one of BYK-024, TEGOAirex 900,900 and Foamaster No. 2331 and Deefo 2150. Preferably, the nano silicon dioxide has a surface area of 100-300 m2/g, the surface is treated by organosilane, and the average particle size of nano aluminum oxide is 10-50 nanometers. Still more preferably, evonik Aerosil R812S or