PVB Interlayer Molecular Weight for Laminated Glass Adhesion
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Solution Overview
Problem
Laminated glass experiences delamination under high moisture and temperature conditions due to moisture penetration between glass layers and the interlayer, disrupting hydrogen bonding and leading to adhesive failures.
Innovation Solution
The use of polyvinyl butyral (PVB) interlayer films with a specific average molecular weight and the incorporation of metal salts and plasticizers, which enhance adhesive properties and resistance to delamination, ensuring improved durability and sound insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional PVB or EVA interlayers are used in laminated glass, then the glass provides basic bonding and safety functions, but the adhesive properties deteriorate under high moisture and temperature conditions leading to delamination
Solution Approach 1:
The patent applies parameter changes by precisely controlling the molecular weight of PVB resin (175,000-210,000 Dalton) and optimizing plasticizer content (30-50 pph) to enhance adhesive properties. This specific parameter optimization resolves the contradiction by making the interlayer resistant to moisture penetration and delamination under high temperature and humidity conditions while maintaining reliable bonding
Solution Approach 2:
The patent uses composite materials by combining PVB resin with specific plasticizers and metal salts to create an interlayer with superior adhesive properties. This composite formulation resolves the technical contradiction by providing both basic bonding function and resistance to moisture-induced delamination, achieving reliability under harsh environmental conditions
2Duration of action of stationary object
If the interlayer is exposed to high moisture and temperature conditions for prolonged periods, then moisture penetrates openings between glass layers and interlayer, but this disrupts hydrogen bonding and causes delamination
Solution Approach 1:
The patent applies parameter changes by optimizing the molecular weight of PVB resin to 175,000-210,000 Dalton and controlling plasticizer content at 30-50 pph. These parameter optimizations enhance the interlayer's resistance to moisture penetration, allowing it to maintain hydrogen bonding integrity and durability even after prolonged exposure to high moisture and temperature conditions
Solution Approach 2:
The patent applies beforehand cushioning by incorporating metal salts and plasticizers into the PVB interlayer formulation in advance. This pre-engineered composition provides protective cushioning against moisture penetration and hydrogen bonding disruption, enabling the interlayer to withstand prolonged environmental exposure without delamination
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 films provide increased pummel adhesion values, especially in outer areas of laminated glass, maintaining integrity even after exposure to 50°C and 95% relative humidity for 28 days, preventing delamination and enhancing the glass's resistance to high moisture and temperature conditions.
Implementation Method 1
The moisture disrupts the hydrogen bonding between the interlayer (e.g., PVB sheets) and the glass layers, resulting in delamination of the laminated glass
Data Source
AI summary
The present disclosure relates to an interlayer film for laminated glass comprising: (a) polyvinyl butyral (PVB) resin having an average molecular weight (Mw) as measured by Gel Permeation Chromatography (GPC) from about 175,000 to about 210,000 Dalton; and (b) about 30 to about 50 parts per hundred (pph) of a plasticizer. The interlayer film interposed between two glass sheets forms laminated glass having a pummel adhesion value that is greater in an outer area of the laminated glass than in a middle area of the laminated glass after the laminated glass has been maintained at 50° C. and 95% relative humidity (RH) for 28 days. The laminated glass exhibits improved durability and does not delaminate over time, even in the presence of high temperature and humidity conditions.