Clear Primer for Glass Bonding with Rapid Drying
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing glass and plastic bonding systems require long dry times for primers, are not suitable for cold temperatures, and struggle with bonding to certain ceramic frits and float glass surfaces, making them inefficient for rapid installation in automotive assembly and other applications.
Innovation Solution
A clear primer composition comprising organotitanates, mercaptosilanes, polyaminosilanes, secondary aminosilanes, and an organotin compound, which dries rapidly and facilitates durable adhesion to various substrates, including float glass, even at low temperatures, without the need for a black-out primer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional clear silane primer is applied to glass or ceramic frit, then the surface is cleaned and prepared for bonding, but long dry times are required before adhesive application
Solution Approach 1:
The patent changes the chemical composition parameters of the primer by incorporating organotitanates with specific ligands (hydrocarbyl groups containing heteroatoms) and controlling the ratio of silane coupling agents to titanate compounds. This chemical parameter modification enables rapid drying while maintaining bond durability, resolving the contradiction between drying speed and bond strength.
Solution Approach 2:
The invention uses a composite primer system combining organotitanates, silane coupling agents, and other additives in specific proportions. This composite formulation provides both rapid drying capability and durable bonding, eliminating the need to choose between speed and strength that plagues traditional single-component primers.
2Reliability
If a black-out primer is applied to prepare the glass surface, then adhesion is facilitated, but the primer can mar surfaces of the structure or vehicle
Solution Approach 1:
The patent extracts and eliminates the black-out primer step from the traditional three-stage process, retaining only the clear silane primer and adhesive application. This removal of the problematic black-out primer eliminates surface marring while maintaining adhesion through the optimized clear primer formulation containing organotitanates and silane coupling agents.
Solution Approach 2:
The invention replaces the permanent black-out primer coating with a clear, evaporating solvent-based primer that leaves no residual film. The volatile solvent carrier allows the primer to perform its adhesion-promoting function temporarily and then evaporate completely, leaving no marred surface, effectively treating the primer as a disposable functional layer.
3Reliability
If a primer system is used to bond to float glass or zinc-based frit, then adhesion is achieved, but bonding is difficult and unreliable
Solution Approach 1:
The patent develops a universal primer formulation based on organotitanates with specific ligands that can bond to multiple difficult substrates including float glass, zinc-based frit, and other ceramic coatings. The titanate compounds provide multi-functional capability to adhere to various surface chemistries, making the system adaptable to different glass types and coatings that traditionally resist bonding.
4Ease of operation
If adhesive bonding is performed at cold temperatures, then installation flexibility is improved, but bonding performance deteriorates
Solution Approach 1:
The invention modifies the chemical parameters of the bonding system by incorporating organotitanates and specific silane coupling agents that remain active at lower temperatures. This chemical parameter change allows the adhesive bonding process to proceed effectively at cold temperatures, maintaining bonding performance while improving installation flexibility in cooler environments.
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 enables rapid bonding of glass or plastic with abrasion-resistant coatings to structures, meeting the timing needs of automotive assembly and providing durable adhesion across different frit systems, including those difficult for traditional systems, such as zinc-based and float glass.
Implementation Method 1
The primer comprises an aqueous primer solution containing a silane coupling agent which is used to facilitate adhesion of a polymer to a non-porous inorganic substrate such as metal or glass. The silane coupling agent has an amino or a mercapto functional group which is capable of reacting with functional groups of the polymer and also has one or more hydrolyzable groups which react with the free-hydroxyl groups on the surface of the substrate.
Implementation Method 2
a solvent which dissolves the components of the composition
Implementation Method 3
The clear primer dries rapidly allowing for application of the adhesive to the treated surface
Data Source
AI summary
The invention is a composition comprising a) one or more organotitanates having four ligands wherein the ligands are hydrocarbyl, optionally containing one or more functional groups having one or more heteroatoms selected from the group comprising oxygen, nitrogen, phosphorus and sulfur wherein two or more of the ligands may form a cyclic structure; b) one or more mercaptosilanes; c) one or more polyaminosilanes; d) one or more secondary aminosilanes; e) a solvent which dissolves the components of the composition; and f) one or more organotin compounds. This composition is referred to as a clear primer hereinafter. In another embodiment the invention is a system for bonding glass to a substrate which comprises a clear primer according to the invention; and an adhesive comprising an isocyanate functional prepolymer and a catalyst for the cure of the isocyanate functional prepolymer.