Ultraviolet-absorbing Film via Silane Composite Coating
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Solution Overview
Problem
Existing ultraviolet-absorbing films on glass surfaces face challenges with long-term durability due to deterioration of ultraviolet-absorbing ability and insufficient mechanical durability, such as abrasion resistance, especially when exposed to high humidity or increased ultraviolet ray absorption.
Innovation Solution
A coating solution comprising a combination of epoxidized organooxysilane compounds, a reaction product of hydroxylated benzophenone and epoxidized organooxysilane compounds, and another organooxysilane compound, with specific proportions and additives like polyepoxides and fine silica particles, to form a silicon oxide network that maintains ultraviolet-absorbing ability and mechanical durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the concentration of ultraviolet absorber is increased to absorb long wavelength ultraviolet rays, then the ultraviolet-absorbing ability is improved, but the mechanical durability deteriorates and bleeding out occurs under high humidity
Solution Approach 1:
The patent uses a composite coating solution comprising silane compound (a), organic compound (b) with ultraviolet-absorbing ability, and coupling agent (c). This composite formulation allows the ultraviolet absorber to be integrated within a silane-based matrix, improving mechanical durability while maintaining ultraviolet-absorbing ability through the synergistic combination of materials.
Solution Approach 2:
The coupling agent (c) acts as an intermediary between the silane compound (a) and the organic ultraviolet-absorbing compound (b). This intermediary component facilitates strong bonding between the inorganic silane matrix and the organic ultraviolet absorber, preventing bleeding out under high humidity while maintaining both mechanical durability and ultraviolet-absorbing ability.
2Strength
If a silica-type ultraviolet-absorbing film is formed to achieve mechanical durability, then abrasion resistance is improved, but the ultraviolet-absorbing ability for long wavelength rays deteriorates
Solution Approach 1:
The patent creates a composite film where silane compound (a) provides the inorganic silica-type matrix for abrasion resistance, while organic compound (b) contributes ultraviolet-absorbing capability. The coupling agent (c) ensures homogeneous distribution and strong interfacial bonding, allowing both functions to coexist without compromising either property.
Solution Approach 2:
The coating solution allows different regions of the film to have specialized functions: the silane compound (a) forms the durable inorganic matrix providing abrasion resistance, while the organic compound (b) is distributed within this matrix to provide localized ultraviolet absorption. This spatial differentiation of functions resolves the contradiction between durability and UV absorption.
3Stability of the object's composition
If the ultraviolet-absorbing film is designed to resist bleeding under high humidity, then long-term stability is improved, but mechanical durability such as abrasion resistance deteriorates
Solution Approach 1:
The coupling agent (c) serves as a mediator that forms strong chemical bonds between the silane compound (a) and the organic ultraviolet-absorbing compound (b). This intermediary bonding prevents the ultraviolet absorber from bleeding out under high humidity conditions while simultaneously maintaining the mechanical durability of the film through the crosslinked network structure formed by the coupling agent.
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 provides an ultraviolet-absorbing film with enhanced mechanical durability and long-term stability against abrasion and ultraviolet degradation, ensuring effective absorption of long-wavelength ultraviolet rays without bleeding of the ultraviolet absorber.
Implementation Method 1
a component derived from an epoxidized organooxysilane compound (a), a component derived from an organooxysilane compound (b) which is a reaction product of a hydroxylated benzophenone compound and an epoxidized organooxysilane compound
Implementation Method 2
each of the above three components is the corresponding organooxysilane compound of the above (a), (b) or (c), or a constituting component of a partially hydrolyzed condensate of at least the corresponding organooxysilane compound
Implementation Method 3
an ultraviolet-absorbing film which has an ability to absorb ultraviolet rays entering into the vehicle or room therethrough
Data Source
AI summary
To provide a coating solution for forming an ultraviolet-absorbing film which has mechanical durability such as abrasion resistance and which is little susceptible to deterioration of the ultraviolet-absorbing ability by use for a long period of time, and an ultraviolet-absorbing glass article having an ultraviolet-absorbing film formed by using such a coating solution, which has mechanical durability such as abrasion resistance and which is little susceptible to deterioration of the ultraviolet-absorbing ability by use for a long period of time. A coating solution which comprises a component derived from an epoxidized organooxysilane compound, a component derived from an organooxysilane compound which is a reaction product of a hydroxylated benzophenone compound and an epoxidized organooxysilane compound, and a component derived from an organooxysilane compound other than the above both organooxysilane compounds, and an ultraviolet-absorbing glass article obtained by using the coating solution.