Yttrium Catalysts for Moisture-Resistant Silylated Polyurethane
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Solution Overview
Problem
Conventional urethane-forming catalysts for silylated polyurethane polymers are sensitive to moisture, requiring complex handling procedures and are often toxic, limiting their industrial application and potentially facing future bans.
Innovation Solution
Employing yttrium-containing catalysts in the preparation of silylated polyurethane compositions to reduce moisture sensitivity and enhance storage stability, allowing for the production of coatings, adhesives, and sealants without the need for moisture-exclusion procedures and toxic tin-containing compounds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional urethane-forming catalysts are used to prepare silylated polyurethane polymers, then the polymerization reaction can proceed, but the polymers become sensitive to moisture causing increased viscosity or gel formation
Solution Approach 1:
The patent changes the chemical parameter of the catalyst from conventional tin or bismuth compounds to yttrium-containing catalysts. This parameter change fundamentally alters the catalyst's interaction with moisture, reducing moisture sensitivity while maintaining catalytic activity for polymerization and silylation reactions.
Solution Approach 2:
The patent replaces toxic tin-containing catalysts with yttrium-containing catalysts that are less toxic and allow for simpler handling procedures. This substitution improves reliability by eliminating the need for complex moisture-exclusion procedures while maintaining effective catalysis.
2Ease of manufacture
If conventional urethane-forming catalysts are used, then the polymerization can be achieved, but complicated moisture-exclusion procedures are required adding to manufacturing costs
Solution Approach 1:
By changing the catalyst parameter from tin/bismuth-based to yttrium-based, the patent eliminates the need for complex moisture-exclusion procedures. The yttrium-containing catalyst maintains catalytic effectiveness while being significantly less sensitive to moisture, thereby simplifying handling procedures and reducing manufacturing complexity.
3Reliability
If tin-containing compounds are used as catalysts, then effective catalysis is achieved, but toxicity increases leading to restrictions and potential bans
Solution Approach 1:
The patent substitutes toxic tin-containing catalysts with yttrium-containing catalysts that exhibit comparable or superior catalytic effectiveness but with significantly reduced toxicity. This replacement eliminates the harmful effects associated with tin compounds while maintaining the required catalytic activity for polymerization and silylation.
Solution Approach 2:
The patent changes the chemical composition parameter of the catalyst from tin or bismuth compounds to yttrium-containing compounds. This parameter change reduces toxicity while preserving catalytic effectiveness, allowing the catalyst to promote both polymerization and silylation reactions without the harmful effects of conventional catalysts.
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 use of yttrium-containing catalysts results in silylated polyurethane polymers with reduced moisture sensitivity and increased storage stability, enabling their use in various applications while avoiding the handling complexities and toxicity issues associated with traditional catalysts.
Implementation Method 1
employing an yttrium-containing catalyst, which results in silylated polyurethane polymers having reduced sensitivity to moisture and increased storage stability
Data Source
AI summary
There is provided herein a silylated polyurethane composition, a process of preparing a silylated polyurethane polymer, and an adhesive, sealant or coating containing a silylated polyurethane made therewith.