Light-Curable Coating Composition for Resin Durability
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Solution Overview
Problem
Existing curable coating agents for resin substrates used outdoors face challenges in achieving both high abrasion resistance and weather resistance, with existing solutions either requiring excessive energy for thermocuring or increasing the number of processing steps, and combinations of components for abrasion and weather resistance failing to deliver long-term performance.
Innovation Solution
A curable coating agent composition combining a urethane adduct compound with a specific organic silicon compound and adequate additives, which is light-curable, allowing for efficient energy use and reduced processing steps while maintaining high abrasion and weather resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a thermocuring coating agent composition is used to achieve both abrasion resistance and weather resistance, then the coating exhibits good durability, but the curing process requires excessive energy and time
Solution Approach 1:
The patent changes the curing mechanism from thermal to photopolymerization, using light activation instead of heat. This parameter change in the curing method enables the coating to achieve the same durability without requiring excessive thermal energy input during the curing process
Solution Approach 2:
The patent replaces the thermal curing system with a photopolymerization system. By substituting heat-based curing with light-based curing, the invention eliminates the need for high energy thermal input while maintaining the crosslinked network structure that provides durability
2Reliability
If a thermocuring undercoating composition and thermocuring coating agent composition are used in combination, then both abrasion resistance and weather resistance are achieved, but the number of processing steps increases
Solution Approach 1:
The patent merges the functions of undercoating and topcoating into a single composition. By combining the weather resistance components (isocyanuric ring-containing compound) and abrasion resistance components (colloidal silica) into one coating agent, the invention eliminates the need for separate undercoating and topcoating applications
Solution Approach 2:
The patent creates a universal coating composition that simultaneously provides both weather resistance and abrasion resistance properties. The single composition contains all necessary components to deliver multiple functions that previously required separate coating layers
3Strength
If colloidal silica particles modified with silane compounds are used to improve abrasion resistance, then the coating hardness increases, but the adhesion to resin substrates deteriorates
Solution Approach 1:
The patent changes the surface modification approach by using isocyanate-grafted silane compounds instead of conventional silane modifications. This parameter change in the silane compound structure enables simultaneous achievement of high abrasion resistance and good adhesion to resin substrates through the isocyanate groups that form urethane bonds with the substrate
Solution Approach 2:
The patent creates a composite coating system combining colloidal silica particles with isocyanate-grafted silane compounds and isocyanuric ring-containing compounds. This composite material approach allows the silica provide hardness while the isocyanate groups provide adhesion, resolving the contradiction between abrasion resistance and adhesion
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 achieves excellent abrasion resistance and weather resistance when cured, with improved adhesion to resin substrates and the ability to be cured quickly at low energy, making it suitable for outdoor resin substrate applications.
Implementation Method 1
a radical polymerization initiator... a light-curing coating agent composition
Implementation Method 2
an ultraviolet absorber... both excellent weather resistance
Data Source
AI summary
Disclosed is a curable coating agent composition which exhibits excellent wear resistance and weather resistance when applied as a coating agent to plastic or other substrates to be used outdoors. The curable coating agent composition comprises 95 to 65 parts by mass of a component (A) comprising an urethane adduct compound having weather resistance, 5 to 35 parts by mass of a component (B) comprising a specific organosilicon compound, 0.1 to 10 parts by mass of a component (C) which is a radical polymerization initiator, 1 to 12 parts by mass of a component (D) which is an ultraviolet ray absorber, and 10 to 1,000 parts by mass of a component (E) which is an organic solvent, with respect to 100 parts by mass of the components (A) and (B) in total.