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Aromatic polyamide adjuvant for heat-resistant paints and wire enamels

A technology of aromatic polyamide and wire-covered varnish, which is applied in the direction of coating, etc., can solve the problems of many bubbles, low heat resistance stability, and hairy appearance of the paint film, so as to improve the thermal shock performance and reduce the unevenness of solvent volatilization , good storage stability effect

Inactive Publication Date: 2007-08-15
CNOOC CHANGZHOU PAINT & COATINGS IND RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the existing polyesterimide wire enamel (see "(Painting Technology", third edition, Chapter 24) generally cannot adapt to the current high-speed wire coating equipment. The paint film painted with this paint The appearance is hairy, with many bubbles and particles, but the existing common modifying additives such as phenolic resin, nylon resin, etc., have many defects such as low heat resistance stability, poor recoatability, and easy to make the paint film cloudy. , so that the application of this common additive on high-speed coating line equipment is limited
There have been reports abroad that the reaction of diisocyanate and dicarboxylic acid to generate aromatic polyamide is used as a modification additive. This additive improves the heat resistance of the paint film and is compatible with polyester, modified polyester and polyesterimide. The miscibility of other resins is good, but because the resin structure of this additive is regular, when the molecular weight is low, the resin is easy to crystallize and precipitate, which will affect the storage stability and the appearance of the paint film; when the molecular weight is too high, it will affect the resin viscosity. Larger, the recoatability of the paint film is greatly affected

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0019] Add 310 parts of N-methylpyrrolidone and 140 parts of dry xylene in a reaction flask equipped with a thermometer, a stirrer and a heater, and 135 parts of 4,4'-diphenylmethane diisocyanate and 95 parts of toluene diisocyanate Dissolve, stir and heat to 40°C, add 78 parts of isophthalic acid, 65 parts of adipic acid and 10 parts of trimethylolpropane, heat up to 80-90°C, keep warm for 1 hour, and then heat up to 100-110°C , keep warm for 1 hour, add 40 parts of cresol, then raise the temperature to 120°C and keep it warm for 0.5 hour, then cool down to 80°C, dilute with a mixed solvent composed of 57 parts of cresol and 70 parts of xylene, the viscosity of the obtained solution is at 25°C When it is 550cpa·s, it is the aromatic polyamide auxiliary agent of the present invention.

example 2～4

[0021] Except that formula uses the quantity shown in table 1 instead, all the other operations are the same as example 1.

[0022] Two, auxiliary agent performance test of the present invention

[0023] The wire enamel obtained after mixing the auxiliary agent of the present invention obtained in Example 1 and Example 3 with the commercially available polyesterimide wire enamel, and the commercially available polyesterimide wire enamel, polyesterimide with 5% nylon 66 resin added Comparison of viscosity of wire enamel (results in Table 2), paint film appearance and hot-shock performance (results in Table 3).

[0024] Table 2 Viscosity Comparison

[0025] sample

Rotational viscosity at 25°C, cpa·s

Commercially available polyesterimide wire enamel

130±20

Polyesterimide wire enamel with 5% nylon 66 resin added

170±20

Add the polyesterimide wire enamel of the auxiliary agent of 6% example 1

140±20

Add the polyester...

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PUM

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Abstract

The invention relates to an aromatic polyamide auxiliary agent for heat resisting enamel insulated wire paint comprising, at least an aromatic dyadic isocyanate, at least a trihydroxylic alcohol, dicarboxylic acid, and solvent. The auxiliary agent is especially suitable for making polyesterimide enamelled wire paint which can be used in the present high speed wire coating equipment.

Description

technical field [0001] The invention relates to an aromatic polyamide auxiliary agent for heat-resistant enameled wire varnish. Background technique [0002] With the development of science and technology, the improvement of insulating materials for electrical appliances and the improvement of insulation technology have attracted more and more attention, and enameled wire varnish plays a decisive role in it. At present, motors and electrical appliances are developing in the direction of small size and high power all over the world, and the requirements for the heat resistance level of insulating materials are also getting higher and higher. Polyesterimide wire enamel has a heat-resistant grade of H (that is, the limit service temperature of electrical equipment is 180°C), which is much higher than that of the currently commonly used polyester paint B (that is, the limit service temperature of electrical equipment is 130°C). Rapid growth. In recent years, the line coating e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D7/12C08G69/00
Inventor 朱东刘长亮孙建美
Owner CNOOC CHANGZHOU PAINT & COATINGS IND RES INST
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