Polyether Compound Production With Low Unsaturation Control
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Solution Overview
Problem
Existing methods using composite metal cyanide complex catalysts result in increased unsaturation degrees and insufficient hardness of cured substances in polyether compounds containing reactive silicon groups, urethane bonds, and polymerizable unsaturated groups, leading to inadequate curing properties and strength.
Innovation Solution
A production method involving the use of a composite metal cyanide complex catalyst with stringent impurity controls, specifically limiting aldehyde content to less than 15 ppm, and employing a slurry catalyst with a dispersion medium to produce polyether compounds with controlled unsaturation and enhanced strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a composite metal cyanide complex catalyst is used to produce polyether compounds, then the molecular weight distribution is narrowed, but the unsaturation degree increases and the hardness of cured substances becomes insufficient
Solution Approach 1:
The patent changes the chemical composition parameters of the catalyst system by introducing a specific organic ligand (containing nitrogen, oxygen, or carbon atoms) combined with the composite metal cyanide complex catalyst. This parameter change modifies the catalyst's activity and selectivity, allowing it to produce polyether compounds with both narrow molecular weight distribution and controlled unsaturation degree, thereby achieving the desired hardness of cured substances without sacrificing manufacturing precision.
2Manufacturing precision
If a composite metal cyanide complex catalyst is used to produce polyether compounds, then the molecular weight distribution is narrowed, but the curing properties become insufficient
Solution Approach 1:
The patent employs a composite catalyst system combining a composite metal cyanide complex catalyst with a specific organic ligand. This composite approach creates a synergistic effect where the organic ligand modulates the catalyst's behavior, ensuring that the polyether compound produced not only has narrow molecular weight distribution but also possesses adequate curing properties through controlled unsaturation degree and functional group composition.
3Ease of manufacture
If aldehyde content is not controlled in the alkylene oxide-containing raw material, then the production process is simpler, but the unsaturation degree of the polyether compound increases
Solution Approach 1:
The patent implements preliminary action by specifying that the alkylene oxide-containing raw material should have an aldehyde content of 15 ppm or less before entering the polymerization process. This pre-control measure prevents aldehyde-induced unsaturation during polymerization, allowing the production process to remain relatively simple while achieving the desired manufacturing precision in terms of unsaturation degree 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
The method achieves polyether compounds with low unsaturation degrees and cured substances exhibiting excellent strength and curing properties, addressing the limitations of previous methods.
Implementation Method 1
a composite metal cyanide complex catalyst is known
Implementation Method 2
crosslinked by the formation of a siloxane bond accompanied by a hydrolysis reaction or the like of the reactive silicon group due to moisture
Data Source
AI summary
A method of producing a polyether compound containing a hydroxyl group that includes polymerizing an AO in an AO-containing raw material with an initiator containing a hydroxyl group in a presence of a composite metal cyanide complex catalyst, in which the raw material has a total content of an aldehyde measured by titration of less than 15 ppm based on a total mass of the AO-containing raw material, a method of producing a polyether compound containing a reactive silicon group including converting a hydroxyl group of a polyether compound into a group containing a reactive silicon group, a method of producing a polyether compound having a urethane bond including reacting a polyether compound containing a hydroxyl group with a polyisocyanate, and a method of producing a polyether compound containing a polymerizable unsaturated group including converting a hydroxyl group of a polyether compound into a group containing a polymerizable unsaturated group.