Polyvinyl Acetal Interlayer Film for Laminated Glass
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Solution Overview
Problem
Existing interlayer films for laminated glass face challenges in achieving optimal penetration resistance, moisture resistance, and sound insulation due to issues with hydroxyl group content, acetylation degree, and plasticizer distribution, leading to problems like plasticizer bleeding and reduced adhesion.
Innovation Solution
An interlayer film comprising a polyvinyl acetal resin with a specific hydroxyl group content, acetylation degree, and a plasticizer represented by formula (1), which includes a phenyl group, an alkylene group, and an average addition number of moles within a certain range, to enhance sound insulation and penetration resistance while maintaining moisture resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a polyvinyl butyral resin with low hydroxyl group content is used to improve sound insulation, then sound insulation is improved, but moisture resistance and penetration resistance deteriorate
Solution Approach 1:
The patent optimizes the hydroxyl group content parameter to a specific range (17-38 mol%) to simultaneously achieve good sound insulation, moisture resistance, and penetration resistance. This parameter optimization resolves the contradiction by finding the optimal balance point rather than using extreme low hydroxyl content.
Solution Approach 2:
The patent uses a composite resin composition containing both polyvinyl butyral resin and polyvinyl acetal resin in specific proportions. This composite approach allows the material to benefit from the sound insulation properties of polyvinyl butyral while the polyvinyl acetal component provides enhanced moisture resistance and penetration resistance.
2Loss of energy
If an increased amount of plasticizer is added to improve sound insulation, then sound insulation is improved, but penetration resistance deteriorates due to plasticizer bleeding
Solution Approach 1:
The patent optimizes the plasticizer content to a specific range (20-80 parts by weight per 100 parts resin) and selects plasticizers with specific molecular weights (200-500) to prevent bleeding while maintaining sound insulation. This parameter optimization prevents the contradiction from occurring.
Solution Approach 2:
The patent introduces a specific type of plasticizer with controlled molecular weight and chemical structure that acts as an intermediary between the resin matrix and the sound insulation function. This intermediary plasticizer provides the necessary flexibility for sound damping without excessive migration that would compromise penetration resistance.
3Loss of energy
If a low-molecular-weight plasticizer is used to improve sound insulation, then sound insulation is improved, but adhesion between interlayer film and glass plates deteriorates
Solution Approach 1:
The patent specifies a molecular weight range (200-500) for the plasticizer that balances adhesion and sound insulation properties. This parameter control prevents the plasticizer from being too low-molecular-weight (which would cause adhesion problems) while still providing effective sound damping.
Solution Approach 2:
The patent creates different functional zones within the interlayer film by controlling plasticizer distribution and resin composition. The plasticizer concentrates in regions where sound damping is needed while maintaining adequate adhesion at the glass interface through controlled composition gradients.
Data Source
AI summary
The present invention has its object to provide an interlayer film for a laminated glass, which is excellent in penetration resistance, moisture resistance, and sound insulation.The present invention relates to an interlayer film for a laminated glass, which comprises: a polyvinyl acetal resin; and a plasticizer, the plasticizer being represented by formula (1):wherein R1 represents a phenyl group, R2 represents an alkylene group having 2 to 4 carbon atoms, and n represents 4 to 6.