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Enameled wire and its manufacturing method

A manufacturing method, enameled wire technology, applied in the direction of cable/conductor manufacturing, conductor, conductor/cable insulation, etc., can solve the problems of heat resistance decline, bending performance and adhesion, toxic and harmful nitrogen oxides, etc., Achieve the effect of reducing coating times, reducing pinhole defects, and avoiding evaporation energy consumption

Active Publication Date: 2018-08-14
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The above-mentioned enameled wire production process has the following defects: (1) the evaporation of a large amount of solvents requires energy consumption, and the combustion of a large amount of solvents produces high carbon emissions; (2) benzene and phenol solvents are toxic and odorous; (3) amides and pyrrolidones Toxic and harmful nitrogen oxides are produced after the solvent-like combustion
The consumption of the diluent of this patent document is usually more than 20wt%, otherwise can't meet production process requirement
The presence of organic compounds with alkenyl groups leads to poor weather resistance, heat resistance, bending performance and adhesion of enameled wires

Method used

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  • Enameled wire and its manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0054] After reacting 1 mol of melamine and 3.6 mol of formaldehyde solution (37wt%) at 70°C for 1 hour, add 3.2 mol of diethanolamine, continue to react at 75°C for 1 hour, and then remove water under reduced pressure at this temperature until the amount of water is very little. Stop the reaction to obtain an amino resin with a hydroxyl value of 900-960 mgKOH / g.

[0055] 0.7mol dimethyl terephthalate, 0.3mol phthalic anhydride, 0.7mol ethylene glycol, 0.5mol trimethylolpropane and 0.3wt% tetrabutyl titanate based on the weight of the total reactants at 200°C Reaction made polyester resin. After the completion of the synthesis reaction, after cooling down to 150°C, 1.5wt% tetrabutyl titanate and 5wt% of the above-mentioned amino resin based on the weight of all reactants were added, stirred evenly to obtain a single-component polyester resin, and stored at room temperature. The resin has a number-average molecular weight of 1700 g / mol, has no fluidity at room temperature, and...

preparation example 2

[0057]0.4 mol dimethyl terephthalate, 0.3 mol phthalic anhydride, 0.3 mol dimethyl fumarate, 0.7 mol propylene glycol, 0.5 mol glycerin and 0.3 wt% tetrabutyl titanate based on the weight of the total reactants Esters react at 200°C to produce polyester polyols. After the synthesis reaction, after cooling down to 150°C, add 0.01wt% dibutyltin dilaurate based on the weight of the polyester polyol, stir evenly to obtain component A, and store at room temperature. The resin has a number-average molecular weight of 1900 g / mol, has no fluidity at room temperature, and has a viscosity of 3-6 Pa·s at 150°C. The content of dimethyl terephthalate in the reactant is about 26wt%

[0058] 0.3mol diphenylmethane diisocyanate, 0.1mol trimethylol propane, 0.31mol m-cresol, 30ml diethylene glycol diethyl ether and 0.05g dibutyltin dilaurate were reacted at 100°C to obtain blocked polyisocyanate, which was B Component.

[0059] When used, the A and B components are mixed to form the polyure...

preparation example 3

[0061] 0.8mol dimethyl terephthalate, 1.0mol ethylene glycol, 0.25mol tris (2-hydroxyethyl) isocyanurate, 0.3mol diaminodiphenylmethane, 0.62mol trimellitic anhydride and based on the total reactant weight 0.3wt% tetrabutyl titanate was reacted at 200°C to prepare polyesterimide resin. After the synthesis reaction was completed, the temperature was lowered to 160° C., and 1.5 wt % of tetrabutyl titanate and 3 wt % of the amino resin obtained in Preparation Example 1 were added based on the weight of the total reactants, and the single-component polyester resin was obtained after uniform stirring. Store at room temperature. The polyesterimide resin has a number average molecular weight of 2100 g / mol, has no fluidity at room temperature, and has a viscosity of 5 to 8 Pa·s at 150°C. The content of dimethyl terephthalate in the reactant was 34 wt%. The content of tris(2-hydroxyethyl)isocyanurate was 15% by weight. In the paint film formed after the polyesterimide resin in Prepa...

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Abstract

The invention discloses an enameled wire and a manufacturing method thereof. The method includes: (1) coating a molten insulating resin composition on the wire to form a resin-coated wire; the insulating resin composition does not contain a volatile solvent or an alkenyl-containing diluent; The volatile solvent is an organic solvent with a boiling point lower than 160°C or an organic solvent whose weight decreases by more than 30wt% after being left open for 10 minutes at 160°C under normal pressure; (2) the resin-coated The wire is cured, and the resin coating is converted into a cured coating to obtain the enameled wire; wherein, the mass conversion rate of the resin coating into a cured coating is greater than 85wt%. The manufacturing method of the invention does not use volatile solvents, does not contain alkenyl-containing diluents, avoids solvent evaporation energy consumption, reduces coating times, reduces insulating resin consumption, and improves heat resistance.

Description

technical field [0001] The invention relates to an enameled wire and a manufacturing method thereof, in particular to an enameled wire without using a volatile solvent and a manufacturing method thereof. Background technique [0002] Enameled wire, also known as winding wire or magnet wire, is a metal wire coated with a heat-resistant insulating layer. It is used to wind coils or windings of electrical products to realize the mutual conversion of electric energy and magnetic energy. Enameled wire is widely used in electromagnetic windings of motors, electrical appliances, telecommunications, and electronic instruments. [0003] Enameled wire needs to meet many requirements in terms of use and manufacturing process. Enameled wire needs to have short-term and long-term heat resistance, excellent insulation and mechanical properties, and the ability to withstand strong vibration and high-speed centrifugal force in some occasions. Enameled wire needs to withstand stretching, b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B13/06H01B7/02
CPCH01B7/02H01B13/065
Inventor 王跃川
Owner SICHUAN UNIV