Silane-Modified Polyisocyanate Primer Adhesion
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Solution Overview
Problem
Current primers used in automotive vehicle applications, such as Betaprime™ 5500 and 5404, have limitations in their suitability for bonding various substrates, particularly metal and glass surfaces, and do not adequately enhance adhesion to coatings or polymeric materials.
Innovation Solution
A primer composition incorporating an adhesion promoter derived from the reaction of aromatic polyisocyanate compounds with organofunctional silanes, specifically aminosilanes, is applied to substrates, enhancing their bonding capabilities to metal, glass, and polymeric surfaces, including coatings and encapsulation materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional primers (e.g., Betaprime™ 5500 and 5404) are used, then general applicability is maintained, but adhesion strength to metal, glass, and polymeric substrates is insufficient
Solution Approach 1:
The primer composition is modified by changing its chemical parameters through the addition of specific adhesion promoters (silane-modified polyisocyanates, titanates, or zirconates) to enhance adhesion strength to metal, glass, and polymeric substrates while maintaining general applicability across different substrate types
Solution Approach 2:
The primer is formulated as a composite material combining conventional polyol/polyisocyanate components with specialized adhesion promoter additives (silane-modified polyisocyanates, titanates, or zirconates) to achieve both strong adhesion to diverse substrates and broad versatility in automotive applications
2Strength
If existing adhesion promoters are used, then some adhesion enhancement is achieved, but adhesion to coatings and polymeric materials remains inadequate
Solution Approach 1:
The adhesion promoter chemistry is changed from conventional options to silane-modified polyisocyanates with specific functional groups that provide superior adhesion to coatings and polymeric materials while ensuring bonding durability through environmental resistance
Solution Approach 2:
Silane-modified polyisocyanates act as intermediary compounds that bridge the primer composition and diverse substrates (metal, glass, polymers, coatings), providing enhanced adhesion through their dual functionality of reacting with both the polyol base and substrate surfaces
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 enhanced primer composition improves adhesion strength and durability, demonstrating 100% cohesive failure in peel tests after aging, indicating strong bonding and resistance to environmental factors.
Implementation Method 1
applying to one or both of the substrates a primer composition that includes an adhesion promoter, which is an adduct prepared by the reaction of at least one aromatic polyisocyanate compound with an active hydrogen moiety of an organofunctional silane
Data Source
AI summary
A composition and method for bonding to a substrate. In general applied to a substantially transparent substrate will be a primer composition that includes a reaction product prepared by the reaction of at least one isocyanate including a thiophosphate with an amino-silane, a mercapto-silane, or a combination thereof.