Silane-Modified UV Coating for Adhesion on Clear/Black PC

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Solution Overview

Problem

Existing ultraviolet-curable coating compositions for car headlamps and electric vehicle radiator grilles fail to provide sufficient scratch resistance, weather resistance, and adhesion, particularly when applied to clear/black PC materials due to variations in thermal conductivity and UV energy absorption.

Innovation Solution

A silane-modified urethane acrylate oligomer is developed using specific monomers and a hydrolysis-condensation polymerization method, combined with a UV-curable coating composition, to enhance adhesion and weather resistance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a typical polyfunctional urethane acrylate oligomer is used in the coating composition, then the coating can be applied to PC materials, but the scratch resistance, weather resistance, and chemical resistance are insufficient

Engineering Contradiction:

Improvescratch resistanceVSAvoidcoating composition complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent uses a composite oligomer structure combining polyfunctional urethane acrylate with silane-modified components. This creates a multi-functional material that simultaneously provides scratch resistance, weather resistance, and chemical resistance without requiring multiple separate coating layers or complex additive packages.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent modifies the oligomer's chemical parameters by introducing silane groups with specific functional groups (isocyanate, alkoxy, hydroxyl). These parameter changes enable crosslinking reactions that enhance the coating's mechanical and environmental resistance properties while maintaining formulation simplicity.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If clear PC and black-colored PC are double-injected to create clear/black PC materials, then aesthetic requirements are met, but variations in thermal conductivity and UV energy absorption cause inconsistent curing balance, degrading adhesion and weather resistance

Engineering Contradiction:

ImproveadhesionVSAvoidcuring balance consistency

Core Design Contradiction:

ReliabilityVSAdaptability or versatility

Solution Approach 1:

The patent introduces silane-modified urethane acrylate oligomer with specific functional groups that can locally adapt to different substrate properties. The silane groups provide localized chemical bonding capability that compensates for variations in thermal conductivity and UV absorption between clear and black PC regions, ensuring consistent curing and adhesion across the entire substrate.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent changes the chemical parameters of the oligomer by incorporating silane groups with isocyanate, alkoxy, and hydroxyl functionalities. These parameter changes enable the coating to accommodate variations in substrate properties through crosslinking reactions, maintaining consistent curing balance and adhesion across clear/black PC materials with different thermal and UV characteristics.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If black-colored PC materials are used for electric vehicle radiator grilles, then aesthetic diversity is achieved, but curing stability, adhesion, and weather resistance become difficult to stabilize

Engineering Contradiction:

Improveweather resistanceVSAvoidcuring stability

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent employs a composite oligomer system combining polyfunctional urethane acrylate with silane-modified components. This composite structure provides inherent stability in curing performance across black-colored PC substrates, eliminating the need for complex formulation adjustments while maintaining excellent weather resistance and adhesion.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The silane-modified urethane acrylate oligomer serves multiple functions simultaneously: it provides UV curing capability, ensures stable adhesion to black PC, delivers weather resistance, and maintains consistent curing performance across different black pigment formulations. This multi-functionality simplifies the manufacturing process by eliminating the need for substrate-specific formulation adjustments.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The composition exhibits excellent curing stability, adhesion, and weather resistance, particularly in black PC materials, with improved mechanical properties and durability.

Implementation Method 1

a silane-modified urethane acrylate oligomer obtained from an acrylate monomer having a hydroxyl group, a silane monomer having an isocyanate group, and a silane monomer having an alkoxy group

Methodology Applied

Scientific EffectHydrolysis-condensation polymerization: Hydrolysis

Implementation Method 2

ultraviolet-curable coating composition including the same

Methodology Applied

Scientific EffectPhotopolymerization: Photopolymerisation

Data Source

PatentEP4685170A1Silane-modified urethane acrylate oligomer and ultraviolet-curable paint composition comprising same

Publication Date: 2026.01.28 KCC CORP

AI summary

The present invention relates to an ultraviolet-curable coating composition having excellent curing stability, adhesion, and weather resistance, and a silane-modified urethane acrylate oligomer applicable thereto.