Polyurethane Methacrylate Coating Scratch Weather Resistance
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Solution Overview
Problem
Existing decorative surfaces for the construction sector face challenges with scratch resistance, weather resistance, and gloss stability, particularly due to the brittleness of polyurethane acrylate coatings and the complexity of radiation-hardening processes, which lead to poor handling and increased costs.
Innovation Solution
A laminated board with a surface layer featuring a polyurethane (meth)acrylate polymer coating, composed of specific resin and hardener components, is produced using a simplified process that enhances scratch resistance and weather resistance without complex radiation hardening, maintaining a stable gloss level and allowing for easy cleaning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polyurethane acrylate coating is used for decorative surfaces, then weather resistance and gloss stability are improved, but scratch resistance deteriorates due to surface brittleness
Solution Approach 1:
The patent uses a composite coating system combining polyurethane acrylate polymer with elastomeric components and reactive diluents. This creates a multi-phase material system where the polyurethane acrylate provides weather resistance and gloss stability, while the elastomeric components provide flexibility and scratch resistance, resolving the contradiction between brittleness and durability
Solution Approach 2:
The patent modifies the chemical composition parameters of the coating by incorporating specific ratios of elastomeric components (1-10 parts by weight per 100 parts polyurethane acrylate) and reactive diluents. This parameter adjustment transforms the coating from a brittle single-phase material to a flexible composite material that maintains both weather resistance and scratch resistance
2Strength
If radiation-cured coatings are used to achieve high scratch resistance, then scratch resistance is improved, but device complexity and manufacturing cost increase due to complex equipment requirements
Solution Approach 1:
The patent replaces the complex radiation curing system (requiring UV lamps, ozone removal equipment, and specialized safety systems) with a simple thermal drying process. The coating cures through evaporation and oxidation at ambient or slightly elevated temperatures, eliminating the need for expensive radiation curing equipment while achieving comparable scratch resistance
Solution Approach 2:
The patent uses a simple, disposable coating formulation that cures through ambient air drying rather than requiring expensive, complex radiation curing infrastructure. This approach treats the curing process as a simple evaporative drying step that can be performed with basic industrial drying equipment already present in most manufacturing facilities
3Strength
If radiation-cured coatings are applied to decorative surfaces, then scratch resistance is improved, but ease of operation deteriorates due to strong curling tendency during curing
Solution Approach 1:
The patent replaces the rapid radiation curing process that causes immediate and strong curling with a gradual thermal drying process. The slow evaporation of solvents and gradual polymerization reduces internal stresses, minimizing curling and making the coated panels easier to handle during the curing process
Solution Approach 2:
The patent incorporates curl-prevention measures into the coating formulation itself, using flexible polymers and controlled solvent systems that minimize differential shrinkage during drying. This preliminary formulation design prevents the development of strong curling tendencies before the coating is even applied, improving handling ease throughout the manufacturing process
4Shape
If matting agents are added to adjust gloss level, then gloss control is improved, but scratch resistance deteriorates and weather resistance decreases
Solution Approach 1:
The patent achieves gloss control through parameter adjustment of the polymer composition itself, specifically by controlling the ratio of hard and soft segments in the polyurethane acrylate and selecting appropriate elastomeric components. This compositional parameter control provides gloss adjustment without introducing matting agents that would compromise scratch resistance and weather resistance
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 solution achieves a scratch resistance of ≥6N, minimal change in gloss after 3500 hours of weathering, and chemical resistance, while simplifying the manufacturing process and reducing costs by avoiding complex multi-stage hardening.
Implementation Method 1
a reaction of the hydroxy groups in the resin component with the isocyanate groups of the hardener component takes place, such that a polyurethane polymer is formed in the coating
Implementation Method 2
polymerization of the (meth)acrylic double bonds takes place in the dried coating and a laminated sheet with a core layer and a surface layer on at least one sheet surface is formed, the outermost layer having a polymer coating with a polyurethane (meth)acrylate polymer
Data Source
AI summary
The invention relates to a laminated sheet having a surface layer on at least one sheet surface, which as the outermost layer has a polymer coating with a polyurethane(meth)acrylate polymer, and which is characterized by excellent scratch resistance and resistance to weather. Furthermore, a method for the production of polyurethane(meth)acrylate-coated laminated sheets is provided.