UV-Curable Coating Composition with Integrated Silane Absorber
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing UV-curable resin coating compositions face issues with photo-degradation due to UV radiation, leading to decreased durability and adhesion, and the addition of UV absorbers often results in poor compatibility and effectiveness.
Innovation Solution
A coating composition combining a co-hydrolytic condensate of UV-absorbing alkoxysilane, UV-curable alkoxysilane, and tetraalkoxysilane, along with a photobleachable photopolymerization initiator, which forms a durable and adherent cured film upon UV exposure, providing improved UV resistance and transparency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If low molecular weight UV absorbers (benzophenone or benzotriazole) are added to coating compositions, then UV absorption capability is improved, but compatibility with polymers deteriorates and the absorbers volatilize or decompose during preparation, resulting in poor retention in the cured film
Solution Approach 1:
The patent uses a composite structure where UV absorber molecules are incorporated into polymer chains through copolymerization. This creates a unified material system where the UV absorber functionality is permanently integrated into the polymer matrix, preventing volatilization and decomposition issues associated with physical mixtures of low molecular weight UV absorbers and polymers.
Solution Approach 2:
The patent changes the molecular weight parameter of the UV absorber by converting it from a low molecular weight compound to a high molecular weight polymer through copolymerization. This parameter change fundamentally alters the behavior of the UV absorber, improving its retention in the cured film while maintaining UV absorption capability.
2Object-affected harmful factors
If UV-absorbing compounds are added to coating compositions for electronic parts and building members, then UV resistance is improved, but adhesion between the cured film and substrate deteriorates
Solution Approach 1:
The patent changes the molecular weight and chemical structure parameters of the UV absorber by converting it into a polymer through copolymerization. This parameter change allows the UV absorber to become an integral part of the coating matrix, preventing the adhesion deterioration that occurs when small molecule UV absorbers are physically mixed into the coating composition.
3Object-affected harmful factors
If UV-absorbing compounds are added to coating compositions, then UV absorption is improved, but transparency of the cured film deteriorates
Solution Approach 1:
The patent changes the molecular weight parameter of the UV absorber by polymerizing it, which improves compatibility with the coating matrix and enables better control of the curing process. This allows the formulation to achieve both UV absorption and transparency by optimizing the polymer structure and curing conditions.
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 durable, tenacious adhesion to substrates and transparency while maintaining UV resistance, addressing the limitations of previous compositions by enhancing film properties such as mar resistance and wear resistance.
Implementation Method 1
a photobleachable photopolymerization initiator (C), and wherein said coating composition forms a cured film upon exposure to UV
Implementation Method 2
the UV-absorbing alkoxysilane, desirably of formula (I) shown later, a UV-curable alkoxysilane
Implementation Method 3
co-hydrolytic condensate of a UV-absorbing alkoxysilane
Implementation Method 4
co-hydrolytic condensate of a UV-absorbing alkoxysilane, a UV-curable alkoxysilane, and a tetraalkoxysilane
Data Source
AI summary
A coating composition is provided comprising (A) a co-hydrolytic condensate of a UV-absorbing alkoxysilane, a UV-curable alkoxysilane, and a tetraalkoxysilane, (B) a polyfunctional poly(meth)acrylate, and (C) a photobleachable photopolymerization initiator. Upon exposure to UV, the composition cures briefly at low temperature to form a cured film having durability, adhesion and transparency.