Low-temperature fast-drying direct-soldering high-adhesion enameled wire water-based self-adhesive varnish and its preparation method

By combining anionic polycarbonate-type polyurethane dispersions and surface additives, the problems of low-temperature rapid drying and high adhesion of water-based self-adhesive paints are solved, achieving low-temperature rapid curing and high adhesion. This makes the paint suitable for high-end engineering equipment and electronic and electrical products, improving production efficiency and equipment stability.

CN120966355BActive Publication Date: 2026-05-26GUANGDONG SHUNDE DADIYUAN NEW MATERIALS CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
GUANGDONG SHUNDE DADIYUAN NEW MATERIALS CO LTD
Filing Date
2025-09-19
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

Existing water-based self-adhesive paints have long curing times at room temperature and insufficient fast-drying performance at low temperatures, making it difficult to meet the high-speed requirements of automated production lines. Furthermore, it is difficult to balance adhesive strength and heat resistance, which can easily lead to delamination or bubble defects during welding. They cannot meet the core indicators such as rapid curing at low temperatures, direct welding without removing the adhesive layer, and high adhesion.

Method used

A water-based self-adhesive varnish for low-temperature, fast-drying, direct-soldering enameled wire was prepared by combining anionic polycarbonate-type polyurethane dispersion, surface additives, and polyurethane resin, and by optimizing the resin system design and curing mechanism. The polar groups of polycarbonate and the characteristics of the siloxane backbone are used to improve wettability and leveling properties, thereby enhancing drying rate and adhesion.

Benefits of technology

It achieves rapid curing and high adhesion at low temperatures, with good self-adhesion. It can complete tinning at 340~360℃, improving production efficiency and reducing energy consumption. It is suitable for high-end engineering equipment and electronic and electrical products, enhancing insulation performance and equipment stability.

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Abstract

This invention belongs to the field of water-based self-adhesive varnishes, specifically relating to a low-temperature, fast-drying, direct-soldering, high-adhesion enameled wire water-based self-adhesive varnish and its preparation method. The low-temperature, fast-drying, direct-soldering, high-adhesion enameled wire water-based self-adhesive varnish provided by this invention comprises, by weight percentage, 78-82% anionic polycarbonate-type polyurethane dispersion, 0.2-2% surface additives, 3-8% polyurethane resin, and 12-14.8% deionized water. The low-temperature, fast-drying, direct-soldering, high-adhesion enameled wire water-based self-adhesive varnish provided by this invention has a tack-on temperature higher than 90℃, a peak tack temperature of 155℃, and a full-coat tinning temperature not exceeding 360℃. It can be used in various fields such as shipbuilding, aircraft, high-speed rail, high-end engineering equipment, electronics, electrical engineering, and motors, effectively enhancing insulation performance, protecting conductors, and improving equipment stability.
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