Silylated Polymer Catalysis for Low-Temperature Stable Synthesis
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Solution Overview
Problem
Moisture-crosslinking polymers, particularly silylated polyurethanes, suffer from low storage stability, necessitating measures to enhance stability during storage, such as the addition of water scavengers.
Innovation Solution
The use of metal-siloxane-silanol(ate) compounds as catalysts for synthesizing silylated polymers, allowing for improved storage stability and reduced formation of unwanted by-products at lower temperatures, thereby enhancing processability and reducing the need for tin-containing catalysts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional catalysts are used for synthesizing silylated polymers, then the synthesis proceeds at normal temperatures, but the storage stability of the polymers deteriorates
Solution Approach 1:
The patent changes the catalytic parameter from conventional catalysts to metal-siloxane-silanol(ate) compounds, which enables the synthesis to proceed at lower temperatures (below 80°C, preferably below 60°C or even room temperature) while producing silylated polymers with improved storage stability and prolonged fibre time
Solution Approach 2:
The invention uses composite catalyst systems comprising metal-siloxane-silanol(ate) compounds that combine multiple functional groups (siloxane, silanol, and silanolate) within a single catalytic structure, achieving both low-temperature synthesis and enhanced polymer stability simultaneously
2Manufacturing precision
If conventional catalysts are used for synthesizing silylated polymers, then the synthesis is straightforward, but unwanted by-products increase formation
Solution Approach 1:
By changing the catalytic conditions to use metal-siloxane-silanol(ate) compounds at lower temperatures, the patent achieves higher reaction specificity that reduces unwanted by-products such as ureidoformamide, while maintaining a relatively simple synthesis process requiring only modified catalyst selection and temperature control
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
Silylated polymers synthesized with metal-siloxane-silanol(ate) compounds exhibit prolonged fiber time and tack-free time, maintaining good curing properties while minimizing by-product formation and lowering energy consumption.
Implementation Method 1
The use of metal-siloxane-silanol(ate) compounds as catalysts for synthesizing silylated polymers
Implementation Method 2
Polymers such as silylated polyurethanes, for example, that condense ('crosslink') on contact with water or air humidity
Implementation Method 3
Depending on factors including the content of silane groups and the structure thereof, it is possible for long-chain polymers, wide-mesh three-dimensional networks or highly crosslinked systems to form
Data Source
AI summary
The invention relates to a composition comprising and to a process for preparing moisture-crosslinking polymers under catalysis by a metal-siloxane-silanol(ate) compound, and to the use of the composition in the CASE sector (coatings, adhesives, sealants and elastomers), especially in the field of adhesives and sealants.