Interlayer Film Flexural Rigidity via Resin and Plasticizer Control
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Solution Overview
Problem
Conventional interlayer films for laminated glass often result in low flexural rigidity, making it difficult to thin glass plates while maintaining sufficient rigidity, which is essential for reducing weight and environmental impact, especially in applications like automobile side doors.
Innovation Solution
An interlayer film with a specific structure containing polyvinyl acetal resin and a plasticizer, where the half-value width of the hydroxyl group is less than or equal to 250 cm−1, and the plasticizer content is between 5 to 30 parts by weight relative to 100 parts of the resin, enhancing the flexural rigidity of laminated glass.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional interlayer films are used, then the laminated glass can be manufactured with standard glass thickness, but the flexural rigidity is low causing deflection issues
Solution Approach 1:
The patent changes the chemical composition parameters of the interlayer film by specifying polyvinyl acetal resin with 60-85% acetalization degree, controlled plasticizer content (5-30 parts by weight per 100 parts resin), and metal salt additives (0.001-1.0 part by weight). These parameter changes optimize the balance between rigidity and flexibility, enabling the interlayer film to provide sufficient flexural rigidity while maintaining operational ease.
Solution Approach 2:
The patent creates a composite material system by combining polyvinyl acetal resin with plasticizers and metal salts in specific proportions. This composite interlayer film formulation achieves synergistic effects where the resin provides structural rigidity, the plasticizer maintains flexibility for operation, and metal salts enhance adhesion and overall mechanical properties, resolving the contradiction between rigidity and ease of operation.
2Weight of moving object
If glass plate thickness is reduced to decrease weight, then material usage and environmental impact are reduced, but maintaining sufficient flexural rigidity becomes extremely difficult
Solution Approach 1:
The patent optimizes the interlayer film composition parameters to compensate for reduced glass thickness. By controlling the acetalization degree (60-85%), plasticizer content (5-30 parts per 100 parts resin), and adding metal salts (0.001-1.0 part per 100 parts resin), the interlayer film's mechanical properties are enhanced to provide the necessary flexural rigidity even when glass plates are thinner, thus reducing overall weight while maintaining strength.
Solution Approach 2:
The patent employs a composite interlayer film material system that combines polyvinyl acetal resin with plasticizers and metal salts. This composite structure creates a synergistic effect where the resin matrix provides baseline rigidity, the plasticizer phase maintains flexibility, and metal salt particles enhance mechanical strength and adhesion. This composite approach allows the interlayer film to compensate for thinner glass plates, enabling weight reduction while preserving sufficient flexural rigidity.
Data Source
AI summary
There is provided an interlayer film for laminated glass with which the flexural rigidity of laminated glass can be enhanced. The interlayer film for laminated glass according to the present invention has a one-layer structure or a two or more-layer structure and is provided with a first layer containing a polyvinyl acetal resin and a plasticizer, and the half-value width of the hydroxyl group of the polyvinyl acetal resin contained in the first layer is less than or equal to 250 cm−1 and the content of the plasticizer contained in the first layer relative to 100 parts by weight of the polyvinyl acetal resin contained in the first layer is greater than or equal to 5 parts by weight and less than 30 parts by weight, or the half-value width of the hydroxyl group of the polyvinyl acetal resin contained in the first layer is greater than 250 cm−1.