Laminated Glass Interlayer Film Gap Prevention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional interlayer films for laminated glass often result in gaps at the ends of the glass sheets when exposed to light or heat, leading to reduced adhesive force and increased yellow index values, which affect the appearance and performance of the laminated glass.
Innovation Solution
An interlayer film with a one-layer or multi-layer structure, comprising polyvinyl acetal resin, plasticizer, hindered amine light stabilizer, and specific oxidation inhibitors with sulfur and phenol skeletons, is used to prevent gap formation and maintain low yellow index values, enhancing adhesive force and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional interlayer film is used, then the basic safety function is provided, but gaps are generated at the end parts when exposed to light and heat
Solution Approach 1:
The patent modifies the chemical composition parameters of the interlayer film by incorporating specific antioxidants (phenolic and amine types) and UV absorbers (benzotriazole and triazine types) in controlled amounts. These parameter changes enhance the film's resistance to degradation under light and heat exposure, preventing gap formation at the ends while maintaining overall film integrity.
Solution Approach 2:
The interlayer film is designed as a composite material system combining polyvinyl acetal resin base material with multiple functional additives including antioxidants and UV absorbers. This composite structure provides synergistic effects where each component contributes specific properties: the base resin provides adhesion, antioxidants prevent oxidation, and UV absorbers block harmful radiation, collectively preventing gap formation.
2Strength
If a conventional interlayer film is used, then the adhesive force is initially sufficient, but it decreases when gaps are generated
Solution Approach 1:
The patent applies preliminary protective action by incorporating antioxidants and UV absorbers into the interlayer film composition before the degradation process begins. These additives proactively prevent oxidation and UV-induced damage that would otherwise compromise the adhesive force, ensuring the bonding strength is maintained throughout the service life even under harsh light and heat conditions.
3Manufacturing precision
If a conventional interlayer film is used, then the yellow index value is initially low, but it increases when exposed to light and heat
Solution Approach 1:
The patent converts the harmful effects of light and heat exposure into beneficial protection by incorporating UV absorbers that actively absorb harmful UV radiation and transform it into harmless energy. The antioxidants simultaneously convert potentially harmful oxidative reactions into controlled protective mechanisms, preventing yellowing and maintaining optical clarity even after prolonged exposure to adverse environmental conditions.
4Stability of the object's composition
If oxidation inhibitors are added to prevent yellowing, then the yellow index stability improves, but the complexity of the formulation increases
Solution Approach 1:
The patent applies local quality by strategically selecting and positioning specific types of antioxidants and UV absorbers within the interlayer film formulation. Rather than using a broad spectrum of additives, the invention focuses on specific phenolic and amine antioxidants combined with benzotriazole and triazine UV absorbers, each placed to address specific degradation pathways. This targeted approach maintains yellow index stability while minimizing unnecessary formulation complexity.
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 interlayer film effectively prevents gap formation and suppresses the increase in yellow index values at the ends of laminated glass sheets, improving the appearance and performance by maintaining adhesive force and durability even under exposure to light and heat.
Implementation Method 1
the following Patent Document 1 discloses an interlayer film having a low tendency to turn yellow, having high transmittance for UV-A rays and visible light, and having low transmittance for UV-B rays. This interlayer film includes a polyvinyl acetal, a plasticizer and an oxanilide-type compound as a UV absorber.
Implementation Method 2
including a polyvinyl acetal resin, a plasticizer, a hindered amine light stabilizer, an oxidation inhibitor having a sulfur atom, and an oxidation inhibitor having a phenol skeleton
Data Source
Figure 1~3
AI summary
There is provided an interlayer film for laminated glass making a gap difficult to be generated at an end part of the sheet of laminated glass and enabling an increase in the YI value measured at the end part of the sheet of laminated glass to be suppressed. The interlayer film for laminated glass according to the present invention has a one-layer structure or a two or more-layer structure, and the interlayer film for laminated glass according to the present invention includes a polyvinyl acetal resin, a plasticizer, a hindered amine light stabilizer, an oxidation inhibitor having a sulfur atom, and an oxidation inhibitor having a phenol skeleton which is different from the oxidation inhibitor having a sulfur atom.