Laminated Glass Interlayer Film UV Blend to Prevent Re-Agglomeration
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Solution Overview
Problem
Existing UV absorbers for laminated glass either re-agglomerate, causing optical disturbances, or provide insufficient UV protection, failing to meet current health and environmental standards without compromising optical properties.
Innovation Solution
A combination of triazine-based UV absorber (Riasorb 470) and liquid UV absorber (Riasorb UV-109) in a specific mass ratio, forming a homogeneous mixture with polyvinyl acetal-based interlayer films to enhance UV protection without re-agglomeration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If triazine based UV absorbers are used to provide long lasting UV protection, then UV protection duration is improved, but re-agglomeration occurs causing visible spots on the film surface
Solution Approach 1:
The patent combines triazine based UV absorbers (formula I) with liquid UV absorbers (formula II) in a specific mass ratio range of 0.1 to 0.75. This merging of two different UV absorber types creates a synergistic effect where the liquid UV absorber prevents re-agglomeration of the triazine-based absorber while maintaining long-lasting UV protection, thus resolving the contradiction between durability and surface quality
Solution Approach 2:
The patent optimizes the mass ratio parameter of the UV absorber mixture within the range of 0.1 to 0.75 (preferably 0.2 to 0.5). By carefully controlling this parameter, the formulation achieves the right balance between triazine-based UV protection durability and liquid UV absorber's anti-re-agglomeration properties, preventing visible spots while maintaining protection duration
2Illumination intensity
If liquid UV absorbers are used to form homogenous mixture without optical disturbances, then optical properties are improved, but UV absorption is too low for nowadays standards
Solution Approach 1:
The patent merges liquid UV absorbers (formula II) with triazine based UV absorbers (formula I) in a specific mass ratio range of 0.1 to 0.75. This combination allows the system to benefit from both the optical clarity of liquid UV absorbers and the superior UV protection of triazine-based absorbers, achieving both good optical properties and sufficient UV protection levels
Solution Approach 2:
The patent creates a composite UV absorption system combining two different UV absorber chemistries. The liquid UV absorber forms a homogenous mixture with the PVB film maintaining optical clarity, while the triazine-based UV absorber provides strong UV protection, together forming a composite material system that satisfies both optical and protective requirements
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 combined UV absorbers maintain optical clarity and provide effective UV protection over time, reducing re-agglomeration and maintaining low haze and yellowness, even after prolonged exposure.
Implementation Method 1
a mixture of certain UV absorbers... provide a long lasting UV protection to PVB film... very effective UV absorbers... provide effective UV protection
Data Source
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AI summary
The invention relates to an interlayer film for laminated glass comprising at least one polyvinyl acetal, at least one plasticizer and a mixture of a first UV absorber of formula 1: wherein R1 represents an alkyl group having 1 to 20 carbon atoms and R2 represents an alkoxy group having 1 to 20 carbon atoms and a second UV absorber according to formula II in a mass ration of first to second UV absorber of 0.2 to 0.5.