Silane-Terminated Adhesive Composition With Safer Moisture Scavenger
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Solution Overview
Problem
Existing silane-curing adhesives and sealants rely on vinyltrimethoxysilane as a water scavenger, which is volatile, has an unpleasant odor, and poses processing hazards due to its low flash point, despite its cost-effectiveness and high reactivity, making it indispensable but undesirable.
Innovation Solution
A crosslinkable mass composition using phenyltrimethoxysilane as a water scavenger, combined with nitrogenous organosilicon compounds and optional additives, replaces vinyltrimethoxysilane, maintaining mechanical properties while eliminating its drawbacks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If vinyltrimethoxysilane is used as a water scavenger, then high reactivity and cost-effectiveness are achieved, but volatility, unpleasant odor, and low flash point cause processing hazards and safety issues
Solution Approach 1:
The patent changes the chemical structure of the silane water scavenger by replacing the vinyl group with an aromatic group (phenyl, tolyl, xylyl, or naphthyl group). This structural parameter change maintains the reactivity needed for water scavenging while significantly improving safety parameters: the aromatic group eliminates volatility and odor issues, and raises the flash point above 100°C, resolving the contradiction between reactivity and safety.
2Reliability
If vinyltrimethoxysilane is used as a water scavenger, then effective moisture removal is achieved, but the unpleasant odor and volatility degrade the user experience and environmental quality
Solution Approach 1:
The patent modifies the molecular structure of the water scavenger by substituting the volatile vinyl group with non-volatile aromatic groups. This parameter change preserves the chemical reactivity required for effective water scavenging while eliminating the harmful volatility and unpleasant odor characteristics, thus resolving the contradiction between scavenging efficiency and environmental quality.
3Reliability
If a highly reactive silane like vinyltrimethoxysilane is used, then water scavenging performance is improved, but processing safety deteriorates due to low flash point
Solution Approach 1:
The patent changes the chemical composition parameter by replacing vinyltrimethoxysilane with aromatic silanes having flash points above 100°C. This parameter change maintains adequate water scavenging performance through the preserved silane functionality while dramatically improving processing safety by eliminating the low flash point hazard, thus resolving the contradiction between scavenging performance and ease of operation.
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
Phenyltrimethoxysilane effectively scavenges moisture without degrading the adhesive's properties, offering improved safety and processing characteristics compared to vinyltrimethoxysilane, enhancing usability and reducing environmental impact.
Implementation Method 1
Water scavengers work by undergoing a chemical reaction with the traces of water introduced into the respective product, so that these are no longer available for a reaction with the silane-crosslinking polymers.
Implementation Method 2
Upon contact with water or atmospheric humidity, these alkoxysilane-terminated polymers are able to condense together at room temperature, releasing the alkoxy groups.
Data Source
AI summary
The invention relates to cross-linkable masses comprising (A) 100 parts by weight of compounds of the formula Y- [ (CR1 2) b-SiRa (OR2) 3-a] x (I), (B) at least 0.2 part by weight of phenyltrialkoxysilane of the formula C6H5-Si(OR3)3 (II) where R3 may be the same or different and is a methyl or ethyl radical, (C) 0.1 to 30 parts by weight of nitrogen-containing organosilicon compounds containing units of the formula DeSi (OR5)dR4 cO(4-e-d-c)/2 (III), where the radicals and indices are each as defined in claim 1, to processes for production thereof and to the use thereof as adhesives and sealants, especially for bonding of substrates.