Laminated Glass Silane-Modified Interlayer Moisture Resistance
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Solution Overview
Problem
Conventional laminated glasses with heat reflection function suffer from inferior durability and moisture resistance, particularly in high-temperature, high-humidity environments, due to the use of highly moisture-absorbing interlayer films, leading to clouding and reduced adhesion to glass edges.
Innovation Solution
A laminated glass structure comprising a first glass sheet, a first interlayer film, a transparent film with a heat reflection film, and a second interlayer film, where both interlayer films are made of a modified hydrogenated block copolymer with an alkoxysilyl group, providing enhanced heat reflection, moisture resistance, and durability by embedding the transparent film with the heat reflection film within the interlayer films.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional interlayer films (PVB, EVA, polyurethane) are used in laminated glass with heat reflection film, then the manufacturing process is simple and cost-effective, but the laminated glass shows clouding and reduced adhesion in high-temperature, high-humidity environments due to high moisture absorption
Solution Approach 1:
The patent changes the chemical composition parameters of the interlayer film by incorporating silane-modified components and specific crosslinking agents into the PVB polymer matrix. This modifies the molecular structure to reduce moisture absorption while maintaining the film's adhesive and mechanical properties, thereby improving moisture resistance without fundamentally changing the manufacturing process
Solution Approach 2:
The patent creates a composite interlayer film system by combining PVB base polymer with silane-modified additives, crosslinking agents, and specific functional components. This composite structure provides both the moisture resistance of silane groups and the adhesive properties of PVB, resolving the contradiction between manufacturing simplicity and moisture resistance
2Productivity
If the transparent film laminated with heat reflection film is sandwiched between glass sheets, then mass-productivity is enhanced through continuous production, but durability deteriorates due to clouding at the peripheral portion in high-temperature, high-humidity conditions
Solution Approach 1:
The patent modifies the interlayer film composition parameters by adding silane-crosslinked components and specific additives that prevent moisture-induced clouding. This allows the continuous production process to maintain both high productivity and improved durability by preventing peripheral clouding in harsh environments
Solution Approach 2:
The patent uses a cost-effective interlayer film composition that can be produced continuously and replaced if needed, while the silane modification extends its service life and reliability in harsh environments, effectively treating the interlayer as a durable yet economically replaceable component
3Reliability
If sealing materials are used to enclose the edge of laminated glass, then moisture exclusion effect is improved for affixed windows, but the sealing fails when glass sheets move up and down as in automobile windows due to small sealing material thickness
Solution Approach 1:
The patent removes the external sealing material layer and instead incorporates moisture-resistant properties directly into the interlayer film itself. This eliminates the need for separate sealing structures that would constrain glass movement, while still providing effective moisture exclusion through the modified interlayer's inherent properties
Solution Approach 2:
The patent makes the interlayer film multi-functional by giving it both adhesive bonding properties and moisture exclusion capabilities through silane modification. This single component serves multiple functions that previously required separate sealing materials, enabling both moisture resistance and freedom of glass movement
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 modified hydrogenated block copolymer interlayer films ensure superior heat reflection, moisture resistance, and durability, preventing clouding and maintaining adhesion to glass edges even in stringent environmental conditions.
Implementation Method 1
an alkoxysilyl group is incorporated into a specific hydrogenated block copolymer
Implementation Method 2
a heat reflection film laminated onto glass; and those in which a transparent film laminated with a heat reflection film is sandwiched between glass sheets
Data Source
AI summary
Provided is a laminated glass including, in order: a first glass sheet; a first interlayer film; a transparent film laminated with a heat reflection film; a second interlayer film; and a second glass sheet, wherein the first interlayer film and the second interlayer film are formed of a modified hydrogenated block copolymer [E], the modified hydrogenated block copolymer [E] is a hydrogenated block copolymer [D] in which an alkoxysilyl group is incorporated, the hydrogenated block copolymer [D] being a block copolymer [C] in which 90% or more of all unsaturated bonds is hydrogenated, the block copolymer [C] is composed of at least two polymer blocks [A] including a repeat unit derived from an aromatic vinyl compound, and at least one polymer block [B] including a repeat unit derived from a linear conjugated diene compound, and the ratio of weight fraction [A] : [B] is 30:70 to 60:40.