Transparent high-hardness protective coating for vehicle body paint surface and preparation method thereof

By using core-shell structured nanocomposite fillers and dynamic covalent bond design, combined with silane coupling agent modification and gradient structure, a multifunctional transparent high-hardness coating was prepared. This solved the technical defects of existing vehicle body protective coatings in terms of hardness, toughness, weather resistance and environmental protection, and achieved multifunctional long-lasting protection for high-end automobiles.

CN122188501APending Publication Date: 2026-06-12WUXI I REACH TECH
View PDF 0 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
WUXI I REACH TECH
Filing Date
2026-04-16
Publication Date
2026-06-12

AI Technical Summary

Technical Problem

Existing transparent protective coatings for vehicle bodies cannot simultaneously achieve balance in terms of hardness and toughness, weather resistance and chemical resistance, construction performance and environmental friendliness, and limited functionality, thus failing to meet the multi-functional and long-lasting protection requirements of high-end passenger vehicles and new energy vehicles.

Method used

By employing core-shell structured nanocomposite fillers, dynamic covalent bonds, and gradient structure design, combined with silane coupling agent modification and ultrasonic dispersion process, along with high-functionality compounded resin and NCO/OH crosslinking system, and UV-resistant composite additives, a multifunctional coating integrating high hardness, high toughness, superhydrophobicity, weather resistance, and chemical resistance is prepared through electrostatic gradient spraying and dual-mode curing process.

Benefits of technology

It achieves high hardness (4H-6H), high transparency (60° gloss ≥90), high scratch resistance and impact resistance, weather resistance (color difference ΔE ≤2.0 after 1000h UV aging), chemical resistance (no loss of gloss after 240h immersion in 5% sulfuric acid solution), and strong adhesion (0 grade in cross-cut adhesion test). At the same time, it reduces VOC emissions, making it suitable for industrial production and on-site repair, and meeting the multi-functional protection needs of high-end automobiles.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure SMS_1
    Figure SMS_1
Patent Text Reader

Abstract

The application discloses a transparent high-hardness protective coating for a vehicle body paint surface and a preparation method thereof, and belongs to the technical field of automobile coatings. The protective coating comprises A-component base material and B-component curing agent with a mass ratio of 100:25-30. The A-component base material is composed of high-functionality resin, core-shell structure nano composite filler, functional additives and compound solvent. The high-functionality resin is introduced with acylhydrazone bond dynamic covalent bond, and the coating has a gradient structure. The preparation method comprises the following steps in sequence: nano composite filler pretreatment, A-component base material preparation, finished product blending, gradient coating and curing. The surface hardness of the obtained coating reaches 4H-6H, the elongation at break of the bottom layer is greater than or equal to 120%, the 60-degree glossiness is greater than or equal to 90, the water contact angle is greater than or equal to 140 degrees, the color difference DE after 1000h of ultraviolet aging is less than or equal to 2.0, the coating is normal after 240h of 5% sulfuric acid immersion, the cross-hatch adhesion is 0 level, and the coating is suitable for original factory coating and paint surface repair protection scenes of automobiles.
Need to check novelty before this filing date? Find Prior Art