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Self-curing polyurethane insulating varnish and its production

A polyurethane and insulating paint technology, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problems of complex process, unsatisfactory electrical properties and heat resistance, and can not be treated with electrical coil insulation, and achieves high mechanical strength, Fast curing and strong adhesion

Inactive Publication Date: 2009-07-15
GUANGZHOU BOTHLEADER ELECTRICAL MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the insulating varnish used for small electrical coils generally requires heating and curing, and in order to ensure the insulation effect, the coil must be prebaked to remove moisture before dipping, and the process is relatively complicated.
Although the general-purpose moisture-curing polyurethane paint can be cured at room temperature, it is limited to the surface coating of wood, etc. due to its unsatisfactory electrical properties and heat resistance, and cannot be used for the insulation treatment of electrical coils.

Method used

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  • Self-curing polyurethane insulating varnish and its production
  • Self-curing polyurethane insulating varnish and its production
  • Self-curing polyurethane insulating varnish and its production

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Add 60 parts of polyurethane resin, 3.5 parts of defoamer EFKA2028 (10%), 1.5 parts of leveling agent EFKA3033 (10%), 20 parts of urethane grade xylene and 5 parts of urethane grade butyl acetate into the mixing tank and stir Serve evenly. Its properties are shown in Table 1:

[0018] Table 1

[0019]

[0020]

[0021] Remarks: 1. The tests of various indicators are carried out in accordance with the provisions of "GB / T 1981.2-2003 Electrical Insulation Paint Part 2: Test Methods". 2. Volume resistivity, electric strength: The sample is baked at 25±2°C and tested after 24 hours.

Embodiment 2

[0023] Mix 80 parts of polyurethane resin, 4 parts of defoamer BYK-141 (10%), 3 parts of leveling agent BYK-307, 30 parts of urethane grade xylene, 5 parts of urethane grade butyl acetate and 30 parts of titanium dioxide Finally, use a grinder to grind until the fineness is qualified. Its various properties are shown in Table 2:

[0024] Table 2

[0025]

[0026] Remarks: 1. The tests for items 1-8 in the table are carried out according to the items in "GB / T 1981.2-2003 Electrical Insulation Paint Part 2: Test Methods". The test for the ninth item in the table shall be carried out according to "GB / T 1724-1979 Coating Fineness Determination Method". 2. Volume resistivity, electric strength: The sample is baked at 25±2°C and tested after 24 hours.

[0027] The polyurethane resin used in the above two examples is prepared by the following process: 70 to 80 parts of polyester polyols synthesized from phthalic anhydride, isophthalic acid, Saike and trimethylolpropane are adde...

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Abstract

The invention discloses a self-curing polyurethane insulating varnish, whose components and weight ratio are as follows: polyurethane resin 40-100, defoaming agent 3-5, leveling agent 1-3, urethane grade xylene 20-30 , urethane grade butyl acetate 5-10, filler 0-50. The invention also discloses a preparation method of the insulating varnish. The insulating varnish of the present invention has the following characteristics: no need to bake, fast curing, high mechanical strength, strong adhesive force, suitable for ordinary immersion, brushing and spraying insulation treatment processes of micro motors, PCBs and transformers (especially high frequency transformers) and insulation repairs.

Description

technical field [0001] The invention relates to an electrical insulating varnish, and at the same time, the invention also relates to a preparation method of the electrical insulating varnish. Background technique [0002] At present, the insulating varnish used for small electrical coils generally requires heating and curing, and in order to ensure the insulation effect, the coil must be pre-baked to remove moisture before dipping, and the process is relatively complicated. Although general-purpose moisture-curing polyurethane paint can be cured at room temperature, it is limited to surface finishing of wood and the like due to unsatisfactory electrical properties and heat resistance, and cannot be used for insulation treatment of electrical coils. Contents of the invention [0003] The purpose of the present invention is to provide a polyurethane insulating varnish that can be cured at room temperature by itself. When used for the insulation treatment of electrical coils...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D175/04C09D5/25
Inventor 周树东
Owner GUANGZHOU BOTHLEADER ELECTRICAL MATERIALS CO LTD