Room Temperature Silicone Lamination Adhesive Bubble Eradication
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Solution Overview
Problem
Existing lamination methods for rigid substrates, such as glass, require high temperature and pressure, leading to issues like air bubble entrapment, material degradation, and poor light transmission, while room temperature curing silicone compositions generate bubbles due to volatile by-products, compromising adhesion and mechanical properties.
Innovation Solution
A multiple part condensation curable lamination adhesive composition using titanate/zirconate catalysts with a silyl terminated polymer, cross-linker, and condensation catalyst, where the catalyst is present in excess moisture, ensuring effective bubble eradication and resistance to contaminants, allowing for durable room temperature curing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If high temperature and pressure processing is used for lamination, then adhesion strength is improved, but air bubbles are trapped and material degradation occurs
Solution Approach 1:
The invention changes the temperature parameter from high temperature processing to room temperature curing. The adhesive composition is formulated to cure at room temperature through condensation chemistry, eliminating the need for high temperature and pressure processing while preventing air bubble entrapment and material degradation.
Solution Approach 2:
The invention utilizes the phase transition of volatile by-products from liquid to gas during condensation curing, and then employs a bubble eradication mechanism to remove these gas bubbles. The composition undergoes chemical phase change from uncured to cured state, and the volatile by-products are eliminated through the specific formulation and curing process.
2Loss of energy
If room temperature curing silicone compositions are used, then energy consumption is reduced, but volatile by-products generate bubbles
Solution Approach 1:
The invention converts the harmful effect of volatile by-products into a beneficial outcome by formulating the adhesive to release volatile molecules that facilitate bubble eradication. The condensation curing process releases volatile by-products that help eliminate trapped bubbles, transforming the harmful bubble generation into a self-correcting mechanism that ultimately produces a bubble-free laminate.
Solution Approach 2:
The adhesive composition is self-sufficient in eliminating bubbles through its own curing process. The condensation chemistry naturally produces volatile by-products that facilitate bubble removal, and the formulation is designed to complete curing at room temperature without external energy input, making the system self-service in both energy efficiency and bubble eradication.
3Ease of operation
If highly viscous condensation cure compositions are used, then application on both panes is facilitated, but air and bubbles are easily entrapped
Solution Approach 1:
The invention optimizes the viscosity parameter of the adhesive composition to achieve a balance between ease of application and bubble release. The viscosity is controlled within a specific range that allows the adhesive to be applied to both panes while maintaining sufficient flow characteristics to prevent air bubble entrapment during the lamination process.
4Object-generated harmful factors
If low viscosity formulations are used, then bubble release is improved, but more crosslinker is required leading to increased effluent
Solution Approach 1:
The invention optimizes the crosslinker content parameter within a specific range (0.5-5% by weight) to achieve the desired balance. This controlled crosslinker level provides sufficient bubble release capability while minimizing effluent generation from the condensation curing process, resolving the trade-off between bubble release and environmental impact.
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 solution achieves bubble-free, durable adhesion and resistance to high temperatures and humidity, enabling transparent laminate applications with improved mechanical and aesthetic properties.
Implementation Method 1
condensation cure chemistry using titanium and/or zirconium based catalysts
Implementation Method 2
cure via a condensation cure chemistry using titanium and/or zirconium based catalysts
Implementation Method 3
The release of these volatile molecules cause the generation of bubbles in the body of the curing lamination adhesive
Data Source
AI summary
Two part silicone lamination adhesive compositions which cure via a condensation cure chemistry using titanium and/or zirconium based catalysts at room temperature are disclosed. The compositions comprise: (i) at least one condensation curable silyl terminated polymer having at least one hydrolysable and/or hydroxyl functional group(s) per molecule; (ii) a cross-linker; and (iii) a condensation catalyst selected from the group of titanates and zirconates. Polymer (i) is not stored in the same part as cross-linker (ii) and catalyst (iii). Catalyst (iii) is present in a molar amount which is at least 50% of the moisture present cumulatively in the parts of the composition. The molar ratio of silicon bonded hydroxyl groups in polymer (i) to hydrolysable groups in cross-linker (ii) is above 0.15. The molar ratio of the silicon bonded hydroxyl groups in polymer (i) to M-OR functions is greater than 10, where M is titanium or zirconium.