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Preparation method of polyester wire enamel with relatively good water resistance

A technology of polyester wire enamel and polyester diol, which is applied in the direction of polyester coatings and coatings, can solve the problems of complex wire covering process, lower production efficiency, poor water resistance, etc., achieve wide adaptability and improve production efficiency , The effect of water resistance improvement

Inactive Publication Date: 2016-10-05
DANYANG STAR CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In some special occasions, it is necessary to use enameled wire varnish with better water resistance. At present, the water-resistant varnish is mainly based on epoxy resin, and others such as polyamide-imide, acetal, polyhydantoin, etc. are also better in water resistance. Polyester, polyimide, polyurethane, non-THEIC polyesterimide, etc. are easily hydrolyzed and have poor water resistance. However, even water-resistant paints, as enameled wires, have thinner paint layers and can be used alone. Therefore, in some special occasions, such as motors working in water, it is necessary to cover the outer layer of the enameled wire with a layer of polyethylene, and then treat the entire coil with epoxy resin before use.
In this way, the process of coating enameled wire is more complicated, which reduces the production efficiency.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Firstly, tall oil fatty acid is used to catalyze dimerization with clay to obtain dimer acid, and oligomeric polyester diol is obtained through condensation of adipic acid and ethylene glycol.

[0024] Add 0.51 parts of dimer acid, 1.52 parts of terephthalic acid, 1 part of oligomeric polyester diol, 1 part of ethylene glycol, and 1.22 parts of glycerin in a stirring state according to the following proportions, and heat up to 140 ℃. Then the temperature was raised to 225° C. at a rate of 10.5° C. per hour, kept at a temperature of 2.2 hours, and then vacuumed to the liquid volume. Add cresol solvent to lower the temperature to 180°C and keep it warm for 3.2 hours.

[0025] Take the above-prepared resin, add cresol and xylene, stir and dilute to the required solid content.

[0026] Use the water-resistant polyester wire enamel prepared as described above to coat the enameled wire.

Embodiment 2

[0028] Firstly, tall oil fatty acid is used to catalyze dimerization with clay to obtain dimer acid, and oligomeric polyester diol is obtained through condensation of adipic acid and ethylene glycol.

[0029] Add 1 part of dimer acid, 1 part of terephthalic acid, 1 part of oligomeric polyester diol, 2 parts of ethylene glycol, and 1.2 parts of glycerol in sequence according to the following proportions under stirring, and heat up to 145 ℃. Then the temperature was raised to 206° C. at a rate of 9° C. per hour, kept at a temperature of 2 hours, and then vacuumed to the liquid output. Add cresol solvent to lower the temperature to 185°C and keep it warm for 3.2 hours.

[0030] Take the above-prepared resin, add cresol and xylene, stir and dilute to the required solid content.

[0031] Use the water-resistant polyester wire enamel prepared as described above to coat the enameled wire.

Embodiment 3

[0033] First, linoleic acid is used to catalyze dimerization with clay to obtain dimer acid, and oligomeric polyester diol is obtained through condensation of adipic acid and ethylene glycol.

[0034] Add 1 part of dimer acid, 2 parts of terephthalic acid, 1 part of oligomeric polyester diol, 1 part of ethylene glycol, and 1.8 parts of glycerin in the following proportions in a stirring state, and heat up to 120 ℃. Then, the temperature was raised to 240° C. at a rate of 8.5° C. per hour, kept at a temperature of 2.4 hours, and vacuumed to the liquid volume. Add cresol solvent to lower the temperature to 186°C and keep it warm for 2.3 hours.

[0035] Take the above-prepared resin, add cresol and xylene, stir and dilute to the required solid content.

[0036] Use the water-resistant polyester wire enamel prepared as described above to coat the enameled wire.

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PUM

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Abstract

The invention discloses a preparation method of polyester wire enamel with relatively good water resistance. The preparation method comprises the following steps: 1) sequentially adding 0.51 part of dimer acid, 1.52 parts of terephthalic acid, 1 part of oligo-polyester diol, 1 part of glycol, and 1.22 parts of glycerol in a stirring state, and raising the temperature to 140 DEG C after adding the materials; 2) raising the temperature to 225 DEG C at a rate of 10.5 DEG C / h, preserving the temperature for 2.2h, and performing vacuumizing; 3) adding a certain amount of a cresol solvent, lowering the temperature to 180 DEG C, and preserving the temperature for 3.2h; and 4) taking the prepared resin, adding cresol and dimethyl benzene, performing stirring, and diluting the mixture to have a required solid content.

Description

technical field [0001] The invention relates to a polyester wire enamel and a preparation method thereof, and relates to a water-resistant polyester wire enamel and a preparation method thereof. Background technique [0002] In some special occasions, it is necessary to use enameled wire varnish with better water resistance. At present, the water-resistant varnish is mainly based on epoxy resin, and others such as polyamide-imide, acetal, polyhydantoin, etc. are also better in water resistance. Polyester, polyimide, polyurethane, non-THEIC polyesterimide, etc. are easily hydrolyzed and have poor water resistance. However, even water-resistant paints, as enameled wires, have thinner paint layers and can be used alone. Therefore, in some special occasions, such as motors working in water, it is necessary to cover a layer of polyethylene on the outer layer of the enameled wire and then treat the entire coil with epoxy resin before use. In this way, the enameled wire coating pr...

Claims

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Application Information

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IPC IPC(8): C09D167/02C08G63/20
Inventor 张建清姚扎西张杏荣
Owner DANYANG STAR CHEM