Dimethyl Tin Catalyst Adhesive Coated Plate Bonding
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Solution Overview
Problem
One-part moisture-curable polyurethane compositions often exhibit low adhesion to poorly adhesive coated plates, particularly when using tin atom-bonded alkyl groups like dioctyltin dilaurate and dibutyltin laurate.
Innovation Solution
A one-part moisture-curable adhesive composition is developed by mixing a urethane prepolymer, an aliphatic isocyanate, an aminosilane compound, and a dimethyl tin catalyst, specifically represented by Formula (1), to enhance adhesion to poorly adhesive coated plates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional tin catalysts with long alkyl groups (dioctyltin dilaurate, dibutyltin laurate) are used, then the composition is easy to handle and store, but adhesion to poorly adhesive coated plates deteriorates
Solution Approach 1:
The patent changes the key parameter of the tin catalyst from long alkyl groups (octyl, butyl) to short alkyl groups (methyl), which fundamentally alters the catalyst's reactivity and bonding characteristics. This parameter change enables the catalyst to form stronger bonds with active hydrogen sources on coated plates while maintaining compositional stability.
Solution Approach 2:
The patent creates a composite catalytic system by combining dimethyl tin catalyst with specific heteroatoms (oxygen, sulfur) in the X1 and X2 positions. This composite approach allows the catalyst to simultaneously provide strong adhesion through active hydrogen bonding and maintain stability through the heteroatom contributions, resolving the contradiction between adhesion strength and handling ease.
2Stability of the object's composition
If conventional tin catalysts are used, then the composition maintains stability during storage, but adhesion performance on coated plates deteriorates
Solution Approach 1:
The patent changes the catalyst structure from conventional long-chain alkyl tin compounds to short-chain dimethyl tin compounds with heteroatoms. This parameter change creates a dual-function catalyst that maintains storage stability through the dimethyl structure while achieving superior adhesion through active hydrogen bonding capability.
Solution Approach 2:
The heteroatoms (oxygen, sulfur) in the tin catalyst act as intermediaries that facilitate bonding with active hydrogen sources on coated plates. These intermediary atoms enable the catalyst to bridge the gap between the adhesive composition and the coated plate surface, achieving strong adhesion without compromising storage stability.
3Device complexity
If the catalyst forms bonds only with water, then the curing process is simple, but adhesion to coated plates without primer deteriorates
Solution Approach 1:
The patent changes the catalyst's bonding parameter from water-only reaction to active hydrogen reaction. The dimethyl tin catalyst with heteroatoms is specifically designed to react with active hydrogen sources, enabling direct bonding with coated plates while maintaining a relatively simple one-part moisture-curable system.
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 composition achieves excellent adhesion to poorly adhesive coated plates, with the dimethyl tin catalyst providing higher activity and forming bonds with active hydrogen sources other than water, resulting in superior adhesion and stability.
Implementation Method 1
a dimethyl tin catalyst represented by Formula (1)... the dimethyl tin catalyst providing higher activity and forming bonds with active hydrogen sources other than water
Implementation Method 2
one-part moisture-curable polyurethane composition that is cured by moisture in air... forming bonds with active hydrogen sources other than water
Data Source
AI summary
The present technology provides: a one-part moisture-curable adhesive composition including: a preliminary composition obtained by mixing a urethane prepolymer, an aliphatic isocyanate A, and an aminosilane compound B, and a dimethyl tin catalyst represented by Formula (1) below; and a production method thereof. In Formula (1), X1 and X2 each independently represent a divalent heteroatom, and R1 and R2 each independently represent a hydrocarbon group that may have a heteroatom.