Hydroxyalkyl Methacrylate Stability via Water Content Control
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Solution Overview
Problem
The production of hydroxyalkyl (meth)acrylates is hindered by the generation of dialkylene glycol as an impurity, which leads to instability and unwanted polymerization reactions, affecting the quality and safety of the final resin products.
Innovation Solution
The method involves adjusting the water content in the reaction mixture to no more than 0.05 mass% by using raw materials with controlled water content, and optimizing the addition sequence and amounts of (meth)acrylic acid and alkylene oxide, ensuring that the initial charged amount of (meth)acrylic acid is not more than 90 mass% to inhibit dialkylene glycol generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional production methods are used to produce hydroxyalkyl (meth)acrylate, then production efficiency is maintained, but dialkylene glycol impurity is generated leading to product instability
Solution Approach 1:
The invention changes the water content parameter in the reaction mixture to not more than 0.05 mass%, which fundamentally alters the reaction conditions to prevent dialkylene glycol formation. This parameter change resolves the contradiction by maintaining product stability while eliminating the harmful impurity through precise control of reaction conditions.
Solution Approach 2:
The invention applies preliminary anti-action by pre-adjusting the water content in raw materials and reaction mixture before the polymerization reaction occurs. By controlling water content to not more than 0.05 mass% beforehand, the method prevents dialkylene glycol impurity formation at the source, thereby ensuring product stability without requiring post-processing purification.
2Productivity
If hydroxyalkyl (meth)acrylate is produced with high reactivity, then polymerization performance is improved, but premature polymerization during storage occurs
Solution Approach 1:
By precisely controlling the water content parameter to not more than 0.05 mass%, the invention creates optimal reaction conditions that produce hydroxyalkyl (meth)acrylate with high reactivity while simultaneously preventing premature polymerization during storage. This parameter control resolves the contradiction between productivity and stability.
Solution Approach 2:
The invention produces a high-purity product by eliminating impurities at the production stage, creating a 'clean copy' of the desired compound without the dialkylene glycol impurity that would trigger premature polymerization. This ensures both high reactivity for polymerization and stability during storage.
3Ease of manufacture
If water content in reaction mixture is increased, then dialkylene glycol generation is promoted, but product purity deteriorates
Solution Approach 1:
The invention sets the water content parameter to not more than 0.05 mass%, which is a precise control threshold that simultaneously achieves ease of manufacture and high product purity. This parameter change eliminates dialkylene glycol formation while maintaining practical manufacturability.
Solution Approach 2:
The invention replaces complex post-reaction purification mechanical systems with a preventive approach by controlling water content during the reaction. This substitution achieves high product purity through process control rather than mechanical separation, resolving the contradiction between ease of manufacture and manufacturing precision.
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
This approach results in a highly stable hydroxyalkyl (meth)acrylate with reduced dialkylene glycol content, preventing premature polymerization and ensuring the production of high-quality poly(meth)acrylate resins with improved stability and safety.
Implementation Method 1
reacting (meth)acrylic acid with an alkylene oxide in the presence of a catalyst
Data Source
AI summary
The objective of the present invention is to provide a highly stable hydroxyalkyl (meth)acrylate. The hydroxyalkyl (meth) acrylate according to the present invention is characterized in that a contained amount of dialkylene glycol is not more than 0.05 mass%.