Organic Resin Laminate Coating UV Shielding Weather Resistance
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Solution Overview
Problem
Current organic resin laminates with coating systems fail to achieve a balance of high mar resistance, UV shielding, and long-term weather resistance, often experiencing degradation, discoloration, and cracking under outdoor exposure due to insufficient UV protection and photocatalytic activity from metal oxide nanoparticles.
Innovation Solution
A multilayer coating system comprising a bottom acrylic resin layer, a middle silicone resin layer with composite oxide nanoparticles coated to suppress photocatalytic activity, and an outermost plasma-polymerized organosilicon layer, which provides enhanced mar resistance, UV shielding, and weather resistance while maintaining visible light transparency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If metal oxide nanoparticles are added to coating composition to enhance UV shielding property, then UV shielding is improved, but photocatalytic activity causes degradation and discoloration of the coating and substrate
Solution Approach 1:
The patent uses silane coupling agents as intermediary substances that chemically bond between the metal oxide nanoparticles and the coating resin matrix. This intermediary layer suppresses the photocatalytic activity of metal oxide nanoparticles while maintaining their UV shielding capability, preventing degradation and discoloration of the coating and substrate during outdoor exposure
Solution Approach 2:
The patent creates a composite coating system combining metal oxide nanoparticles, silane coupling agents, and coating resins. This composite structure leverages the UV shielding property of metal oxide nanoparticles while the silane-based matrix provides stability and suppresses harmful photocatalytic reactions, achieving both UV protection and long-term weather resistance
2Object-affected harmful factors
If organic UV absorbers are added to primer layer to prevent UV degradation, then UV protection is improved, but adhesion and transparency are reduced
Solution Approach 1:
The patent changes the type of UV protection mechanism from organic UV absorbers to inorganic metal oxide nanoparticles with suppressed photocatalytic activity. This parameter change allows achieving UV protection without the negative effects of organic absorbers on adhesion and transparency, as the inorganic nanoparticles do not migrate or degrade the coating system
Solution Approach 2:
The silane coupling agents serve as intermediaries that ensure strong bonding between metal oxide nanoparticles and the coating matrix, maintaining adhesion while allowing the nanoparticles to provide UV shielding. This intermediary approach avoids the adhesion problems caused by organic UV absorbers
3Reliability
If silyl-modified UV absorbers are used to improve retentivity, then UV absorber retention is improved, but hardness and flexibility are reduced
Solution Approach 1:
The patent uses silane coupling agents as intermediaries to bond metal oxide nanoparticles to the coating matrix, achieving strong retention of UV protective components without the need for silyl-modified UV absorbers. This approach maintains the hardness and flexibility of the coating while ensuring UV absorber retention through the intermediary silane bonding mechanism
Solution Approach 2:
The composite coating system combines metal oxide nanoparticles with silane-based coating resins, creating a structure where UV protection is provided by the nanoparticles and retention is achieved through silane bonding, without compromising the mechanical properties of the coating
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 multilayer coating system significantly improves mar resistance and weather durability, ensuring the laminate withstands prolonged outdoor exposure without degradation, maintaining transparency and UV shielding properties comparable to glass.
Implementation Method 1
an outermost layer (I) of a hard coating of plasma polymerized organosilicon compound
Implementation Method 2
preferably a silicon oxide coating formed by plasma enhanced chemical vapor deposition
Implementation Method 3
a middle silicone resin layer with composite oxide nanoparticles coated to suppress photocatalytic activity
Implementation Method 4
composite oxide nanoparticles obtained by coating surfaces of zinc oxide nanoparticles, titanium oxide nanoparticles or a combination thereof with at least one member selected from the group consisting of oxides and hydroxides of Al, Si, Zr and Sn
Implementation Method 5
the multilayer coating system possessing a very high level of mar resistance
Implementation Method 6
a bottom layer (III) of an acrylic resin coating film
Data Source
AI summary
An organic resin laminate comprising an organic resin substrate and a multilayer coating system thereon has UV-shielding property and high mar resistance. The multilayer coating system includes an outermost layer (I) resulting from plasma polymerization of an organosilicon compound, a lower layer (II) of a silicone coating composition comprising composite oxide nanoparticle dispersion, silicone resin, curing catalyst, and solvent, and optionally a bottom layer (III) of acrylic resin.