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Method for preparing phenolic resin used for wire enamel

A technology of phenolic resin and enameled wire paint, applied in the field of coating resin, can solve the problem that the amount of phenolic resin can not improve the thermal shock resistance of enameled wire paint film, reduce the crack resistance of the paint film, and is not very suitable for enameled wire paint, etc. Heat shock resistance, improved heat shock resistance, smooth surface appearance

Inactive Publication Date: 2011-05-18
常州市智通树脂有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, many manufacturers mostly purchase 2402 p-tert-butylphenolic resin and 2123 acidic phenolic resin on the market for wire enamelled resins, but they are mainly used as adhesive materials, which are not very suitable for enameled wire enamelled resins.
When the amount of these two types of phenolic resins is slightly larger in the enameled wire enamel, it will affect the surface slippery feeling of the enameled wire and reduce the crack resistance of the paint film, so it can only be used in a small amount. If the amount of phenolic resin is too small, it cannot improve the enameled wire enamel. The thermal impact of the film leads to the inability to achieve a perfect unity of the quality and appearance of the enameled wire varnish

Method used

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  • Method for preparing phenolic resin used for wire enamel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Add 188 grams of distilled water in a 1000ml three-neck flask, start stirring and add 92 grams of paraformaldehyde, then heat to 70°C, keep warm until the material is completely dissolved, add 370 grams of m-p-cresol and 4 grams of ammonia water. Raise the temperature to 95°C, keep warm until "emulsified", and keep warm for 1 hour after "emulsified". Add 3.5 g of benzoic acid. Stop heating, turn to reflux for distillation. Carry out vacuum dehydration, when the vacuum degree reaches the highest, start heating, continuously extract water, the resin turns transparent, the temperature rises again by 5°C, stop heating, add 500 grams of cresol, dissolve for 2 hours, and obtain a solid content of 38.6% and a viscosity of 35 seconds phenolic resin solution.

Embodiment 2

[0022] Add 188 grams of distilled water in a 1000ml three-neck flask, start stirring and add 92 grams of paraformaldehyde, then heat to 80°C, keep warm until the material is completely dissolved, add 370 grams of m-cresol and 5 grams of triethanolamine. Raise the temperature to 98°C, keep warm until "emulsified", and keep warm for 1 hour after "emulsified". Add 4.5 g of benzoic acid. Stop heating, turn to reflux for distillation. Carry out vacuum dehydration, when the vacuum degree reaches the highest, start heating, continuously extract water, the resin turns transparent, the temperature rises to 5°C, stop heating, add 500 grams of cresol, dissolve for 2 hours, and obtain a solid content of 39.3% and a viscosity of 42 seconds Phenolic resin solution.

Embodiment 3

[0024] Add 188 grams of distilled water in a 1000ml three-neck flask, start stirring and add 92 grams of paraformaldehyde, then heat to 75°C, keep warm until the material is completely dissolved, add 370 grams of m-p-cresol and 5 grams of triethanolamine. Raise the temperature to 96°C, keep warm until "emulsified", and keep warm for another 2 hours after "emulsified". Add 4 grams of salicylic acid. Stop heating, turn to reflux for distillation. Carry out vacuum dehydration, when the vacuum degree reaches the highest, start heating, continuously extract water, the resin turns transparent, the temperature rises again by 5°C, stop heating, add 500 grams of cresol, dissolve for 2 hours, and get 40.5% solid content viscosity for 60 seconds Phenolic resin solution.

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Abstract

The invention discloses a method for preparing phenolic resin used for wire enamel, which comprises the following steps: dissolving cresol into distilled water at the temperature of between 70 and 80 DEG C, adding the cresol and weak base into the solution, stirring the mixture, heating the mixture to between 95 and 98 DEG C, then preserving the heat till emulsifying, adding weak acid into the mixture to neutralize the mixture after emulsifying the mixture for 1 to 3 hours, and stopping heating; and dehydrating the obtained solution in vacuum to lower the temperature along with the dehydration of water, heating the solution when the vacuum degree reaches the standard to continually dehydrate the solution so that the color of the solution becomes transparent from turbid, raising the temperature to certain temperature after the solution becomes clear, and stopping heating. The method has the advantage that the method can solve the problem of thermal impact resistance of the wire enamel,and improves the thermal impact resistance of a paint film; and the wire enamel has smooth appearance surface and good glossiness.

Description

technical field [0001] The invention relates to the field of coating resins, in particular to a method for preparing a phenolic resin that can improve the surface gloss of enameled wire paint film and can also improve the thermal impact of enameled wires Background technique [0002] With the development of science and technology and the enhancement of people's awareness of life safety, people have higher and higher requirements for enameled wires used in electronic and electrical products. In addition to high electrical properties and strong mechanical properties, enameled wires also need to meet the standards of smooth surface and good gloss. In order to meet the requirements of the market for enameled wires, enameled wire enamel manufacturers are trying to solve this problem through experiments, and it is found that similar problems can be relatively solved by phenolic resin. However, at present, many manufacturers mostly purchase 2402 p-tert-butylphenolic resin and 2123...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G8/08C08G8/12C09D161/08
Inventor 刘文钦陈积波
Owner 常州市智通树脂有限公司