Low-E Glass Protective Sheet for Chloride-Induced Corrosion
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Solution Overview
Problem
Conventional protective sheets for Low-E glass plates fail to adequately prevent degradation and corrosion of the Low-E layers over extended periods, despite providing initial protection against physical damage and moisture ingress.
Innovation Solution
A protective sheet with a polyolefinic resin film substrate and an acrylic PSA layer containing limited chloride ions (≤8.0 µg/g) is used, which minimizes erosion and corrosion of Low-E glass plates by restricting chloride ion exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional protective sheet with PSA layer is used for Long-term protection of Low-E glass plates, then initial protection against physical damage and moisture is achieved, but chloride ions in the PSA layer cause degradation and corrosion of Low-E layers over time
Solution Approach 1:
The patent changes the chemical composition parameters of the PSA layer by strictly limiting chloride ion content to 105 µg/g or less (preferably 50 µg/g or less, more preferably 10 µg/g or less). This parameter control prevents chloride-induced corrosion while maintaining the adhesive's protective function over long periods.
Solution Approach 2:
The patent employs a disposable protective sheet design where the substrate is made of readily available polyolefinic resin films. The sheet is intended for single-use protection during manufacturing, construction, or renovation processes, after which it is removed and discarded, avoiding long-term exposure issues.
2Strength
If the PSA layer contains typical chloride ion amounts, then adhesion performance is maintained, but the Low-E layer suffers from erosion and corrosion
Solution Approach 1:
The patent modifies the PSA composition by controlling chloride ion concentration to 105 µg/g or less while maintaining effective adhesion through alternative adhesive chemistries. This parameter optimization ensures both strong bonding to the Low-E glass and prevention of corrosion.
Solution Approach 2:
The patent introduces carefully selected adhesive formulations that act as intermediaries between the protective sheet and Low-E glass surface. These adhesives provide necessary bonding strength without introducing corrosive chloride ions, effectively mediating between structural requirements and protection requirements.
3Duration of action of moving object
If protection duration is extended for transportation and storage, then coverage period increases, but chloride ions accumulate and cause degradation
Solution Approach 1:
The patent extends protection duration by controlling chloride ion parameters in the PSA layer to 105 µg/g or less. This parameter control prevents cumulative corrosion effects even during extended transportation and storage periods, enabling reliable long-term protection.
Solution Approach 2:
The patent applies protective sheets with pre-controlled low chloride ion content before transportation and storage. This preliminary action of using low-chloride adhesives prevents future corrosion issues, ensuring the Low-E glass remains protected throughout extended periods without degradation.
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 protective sheet provides long-lasting protection against degradation and corrosion of Low-E glass plates, ensuring excellent reliability and ease of removal without adhesive transfer.
Implementation Method 1
pressure-sensitive adhesive (or PSA; the same applies hereinafter) can be preferably used. In general, pressure-sensitive adhesive has characteristics of being in a soft solid (viscoelastic) state in a room temperature range and easily adhering to adherend under some pressure.
Implementation Method 2
pressure-sensitive adhesive has characteristics of being in a soft solid (viscoelastic) state in a room temperature range
Implementation Method 3
the chloride ion amounts being determined by hot water extraction and ion chromatography under the conditions set forth below
Data Source
Figure 1
Figure 2(A)~2(E)
AI summary
Provided is a Low-E glass plate protective sheet having excellent long-term reliability. A Low-E glass plate protective sheet is provided. The protective sheet has a PSA layer. The PSA layer has a chloride ion amount of 105 µg or less per gram of PSA, determined by hot water extraction.