Silane Coupling Agent Production via Metal Catalyst
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Solution Overview
Problem
Conventional silane coupling agents used in rubber compositions with inorganic fillers like silica are expensive, and their addition leads to increased compounding costs, poor workability, and insufficient wear resistance and hysteresis loss reduction.
Innovation Solution
A process involving the reaction of a silane compound with a compound containing a nitrogen or oxygen atom having an unshared electron pair, in the presence of a metal-containing catalyst, to produce a silane coupling agent with an alkoxyl group, which shortens production time and improves coupling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a conventional silane coupling agent is added to a rubber composition with inorganic filler, then wear resistance and coupling efficiency are improved, but compounding cost increases significantly
Solution Approach 1:
The patent replaces expensive conventional silane coupling agents with a cost-effective alternative: a silane compound containing a nitrogen atom with an unshared electron pair (such as dimethylaminopropylsilane). This cheaper silane compound achieves comparable or superior coupling efficiency with inorganic fillers like silica, thereby reducing compounding costs while maintaining wear resistance.
2Manufacturing precision
If the reaction time is extended to ensure complete reaction, then yield improves, but productivity decreases
Solution Approach 1:
The patent optimizes reaction parameters including temperature (maintaining 0°C to room temperature), catalyst selection (using base catalysts like organometallic compounds), and molar ratios of reactants. These parameter optimizations enable the reaction to reach high conversion rates within 1-6 hours, balancing reaction completeness with production efficiency.
3Loss of time
If an acid catalyst or base catalyst is used to accelerate the reaction, then reaction time is reduced, but side reactions may occur reducing product purity
Solution Approach 1:
The patent employs base catalysts (such as organometallic compounds, alkoxides, or hydroxides) as intermediaries to facilitate the condensation reaction between the silane compound and alcohol. These base catalysts accelerate the reaction effectively while minimizing unwanted side reactions, thereby maintaining high product purity without requiring extended reaction times for purification.
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 process reduces production time and costs while enhancing the coupling efficiency with inorganic fillers, improving wear resistance and hysteresis loss in rubber compositions.
Implementation Method 1
reacting a silane compound (A) with a compound (B) which has a hydroxyl group and further contains a nitrogen atom or an oxygen atom having an unshared electron pair other than an oxygen atom derived from the hydroxyl group, in the presence of a metal-containing catalyst (m) to obtain a silane compound (C)
Data Source
AI summary
Provided is a process for producing a silane coupling agent, which can shorten the time required for the production process. A process for producing a silane coupling agent, characterized by comprising a step of reacting a silane compound (A) with a compound (B) which has a hydroxyl group and further contains an atom having an unshared electron pair other than an oxygen atom derived from the hydroxyl group, in the presence of a metal-containing catalyst (m) to obtain a silane compound (C) which has an alkoxyl group containing the atom having the unshared electron pair other than the oxygen atom derived from the hydroxy group.