Polyether Compound Synthesis Using Aldehyde-Controlled AO Feed
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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 control, 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 and curing properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a composite metal cyanide complex catalyst is used for polymerization, then a polyether compound with narrow molecular weight distribution is obtained, but the unsaturation degree of the polyether compound increases
Solution Approach 1:
The patent extracts and removes aldehyde impurities from the alkylene oxide raw material through purification processes. By eliminating the aldehyde component that causes harmful side reactions, the unsaturation degree is reduced while maintaining the benefits of the composite metal cyanide complex catalyst for narrow molecular weight distribution.
Solution Approach 2:
The patent changes the purity parameter of the alkylene oxide raw material by specifying that aldehyde content must be 0.05 wt% or less. This parameter control prevents excessive unsaturation formation during polymerization while allowing the use of the composite metal cyanide complex catalyst to achieve narrow molecular weight distribution.
2Reliability
If a polyether compound containing reactive silicon group is produced using conventional methods, then crosslinked cured substance is obtained, but the hardness of the cured substance is insufficient
Solution Approach 1:
The patent converts the harmful effect of unsaturation (which causes softness) into a benefit by controlling it to minimal levels. By reducing unsaturation to 0.05 wt% or less, the cured substance achieves both proper crosslinking from reactive silicon groups and increased hardness, transforming the potential harm of side reactions into a benefit of controlled polymerization.
Solution Approach 2:
The patent changes the unsaturation degree parameter to 0.05 wt% or less in the polyether compound containing reactive silicon groups. This parameter optimization ensures that the crosslinking reaction produces cured substances with adequate hardness while maintaining reliable curing properties.
3Productivity
If polyether compound is produced with higher unsaturation degree, then polymerization proceeds more actively, but the strength and curing properties of the final product deteriorate
Solution Approach 1:
The patent introduces a purification process as an intermediary step between raw material preparation and polymerization. This intermediary removes aldehyde impurities that would otherwise cause excessive unsaturation, allowing polymerization to proceed with optimal activity while producing final products with adequate strength and curing properties.
Solution Approach 2:
The patent optimizes the aldehyde content parameter in the alkylene oxide raw material to be 0.05 wt% or less. This parameter control maintains sufficient polymerization activity for productivity while preventing excessive unsaturation that would harm the strength and curing properties of the final polyether compound.
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, ensuring excellent strength and curing properties, particularly in compounds with reactive silicon groups, urethane bonds, and polymerizable unsaturated groups.
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 of the reactive silicon group
Data Source
AI summary
A method of producing a polyether compound containing a hydroxyl group according to the present invention 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 a total content of an aldehyde which is measured by a titration method for the AO-containing raw material is less than 15 ppm with respect to a total mass of the AO-containing raw material, a method of producing a polyether compound containing a reactive silicon group further includes 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 further includes reacting a polyether compound containing a hydroxyl group with a polyisocyanate, and a method of producing a polyether compound containing a polymerizable unsaturated group further includes converting a hydroxyl group of a polyether compound into a group containing a polymerizable unsaturated group.