Water-Soluble Acrylamido-Functional Siloxanols Synthesis
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Solution Overview
Problem
Existing methods for producing (meth)acrylamido-functional siloxanols face challenges such as poor water solubility, use of heavy metal-containing catalysts, organic solvents, and the need for complex purification processes, which result in environmental concerns and reduced efficiency.
Innovation Solution
A process involving the targeted aqueous reaction of aminosilanes with acrylic anhydride in the presence of moisture, leading to the formation of water-soluble acrylamido-functional siloxanols that are spontaneously soluble and can be used directly without further purification, eliminating the need for gas phase stabilizers and reducing VOC release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional synthesis methods using methyl methacrylate and dibutyltin oxide are used, then complete conversion can be achieved, but the process requires high temperatures, toxic catalysts, complex purification, and produces poor space-time yield
Solution Approach 1:
The invention changes the reaction parameters by using aminoalkyltrialkoxysilane and acrylic anhydride instead of the conventional methyl methacrylate system, enabling the reaction to proceed at lower temperatures (60-80°C) while maintaining complete conversion and eliminating the need for toxic dibutyltin oxide catalyst
Solution Approach 2:
The invention extracts and eliminates the toxic catalyst (dibutyltin oxide) and harmful high-temperature conditions from the synthesis process, achieving complete conversion through the selected reactant system that naturally proceeds to completion without catalyst assistance
2Productivity
If high temperatures (165-170°C) are used to achieve complete conversion, then the reaction proceeds efficiently, but acrylic acid polymerizes and requires stabilizers
Solution Approach 1:
The invention changes the temperature parameter from high (165-170°C) to moderate (60-80°C), which prevents acrylic acid polymerization while maintaining efficient reaction progression and complete conversion through the inherent reactivity of the aminoalkyltrialkoxysilane and acrylic anhydride system
3Manufacturing precision
If complex rectification is performed to remove heavy metal residues, then purification is achieved, but additional gas-phase stabilizers are required and disposal costs increase
Solution Approach 1:
The invention extracts and eliminates heavy metal-containing catalysts from the process entirely by using a catalyst-free reaction system with aminoalkyltrialkoxysilane and acrylic anhydride, thereby removing the source of heavy metal residues and eliminating the need for complex rectification and gas-phase stabilizer systems
Solution Approach 2:
The invention uses readily available, non-toxic reactants (aminoalkyltrialkoxysilane and acrylic anhydride) that produce no heavy metal residues, eliminating the need for expensive and complex purification infrastructure
4Manufacturing precision
If distillation is performed at high bottom temperatures and low pressure, then the reaction product can be purified, but polymerization occurs in the column requiring gas-phase stabilizers
Solution Approach 1:
The invention changes the distillation parameters by operating at moderate temperatures and atmospheric or near-atmospheric pressure, preventing polymerization in the distillation column through the inherent stability of the product and absence of residual catalysts or stabilizers from the reaction system
5Manufacturing precision
If organotin catalysts are used to achieve complete conversion, then the reaction proceeds to completion, but toxic heavy metals remain requiring separate disposal
Solution Approach 1:
The invention extracts and eliminates toxic organotin catalysts from the process by using an alternative reaction system with aminoalkyltrialkoxysilane and acrylic anhydride that proceeds to complete conversion without any catalyst, thereby removing the source of heavy metal contamination entirely
Solution Approach 2:
The invention uses inexpensive, non-toxic reactants that eliminate the need for toxic catalysts and their associated disposal requirements, achieving complete conversion through the inherent reactivity of the selected chemical system
6Reliability
If methacrylamidoalkylalkoxysilane is used in aqueous media, then good water solubility is achieved, but hydrolysis releases toxic methanol and ethanol as VOCs
Solution Approach 1:
The invention changes the chemical structure parameter by producing siloxanol compounds with specific alkoxy group configurations that hydrolyze to release non-toxic or low-VOC byproducts, while maintaining excellent water solubility through the aminoalkyl functional groups
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 resulting acrylamido-functional siloxanols are highly water-soluble, environmentally friendly, and can be used immediately after dilution, simplifying application and storage, while reducing contamination and VOC release, thus enhancing their applicability and economic viability.
Implementation Method 1
the hydrolysis of the alkoxy groups and the release of the corresponding alcohols methanol (toxic) and ethanol
Implementation Method 2
by hydrolysis and preferably condensation of N-(2-aminoethyl)-3-aminopropyltrialkoxysilane and/or 3-aminopropyltrialkoxysilane to oligomers
Data Source
AI summary
The invention relates to a composition and to a process for preparing the composition comprising substantially water-soluble (meth)acrylamido-functional siloxanols and to the use thereof. The composition contains acrylamido-functional siloxanols which are obtained by reacting an aminoalkyl-functionalized silicon compound (or the hydrolysis product resulting from the addition of water) with acrylic acid anhydride. Typical starting materials are: 3-aminopropyltrimethoxysilane, 3-aminopropyltriethoxysilane, 3-aminopropylmethyldimethoxysilane, 3-aminopropylmethyldiethoxysilane, 1-aminomethyltrimethoxysilane, etc. The products of the method can be described in an idealized manner by the following formula: (R1O)[(R1O)1-a(R2)aSi(C)1+bO]u[(Y)Si(C)1+bO]u' R1 . (HX)z (V), wherein -C corresponds to an acrylamido group and -Y to OR1 or O1/2, -R1 is hydrogen and R2 is an alkyl group, -HX is an acid with X as an organic/inorganic acid radical.