Hydroxyalkyl Acrylate Storage Stability via Ester Control
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Solution Overview
Problem
Hydroxyalkyl acrylates are prone to generating alkylene glycol diacrylate impurities during storage, leading to undesirable cross-linking and gelation, and the ester formed from acrylic acid dimer and alkylene oxide has not been effectively inhibited, affecting preservation stability and polymer quality.
Innovation Solution
The method involves reducing the content of acrylic acid dimer in the raw material and adjusting the molar ratio of alkylene oxide to acrylic acid, ensuring the ester content is less than 0.10 mass % and alkylene glycol diacrylate is less than 1.0 mass %, thereby inhibiting the formation of these impurities and improving preservation stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If hydroxyalkyl acrylate is stored, then the compound remains available for use, but alkylene glycol diacrylate impurity increases causing cross-linking and gelation
Solution Approach 1:
The patent applies preliminary action by controlling the ester content in the raw material acrylic acid before the hydroxyalkyl acrylate production. By pre-adjusting the ester content to not more than 3.00 mass%, the patent prevents the subsequent formation of alkylene glycol diacrylate during storage, thereby resolving the contradiction between storage duration and harmful impurity generation.
2Productivity
If acrylic acid dimer reacts with alkylene oxide, then ester is formed, but this ester causes alkylene glycol diacrylate generation during storage
Solution Approach 1:
The patent applies parameter changes by strictly controlling the ester content parameter in the raw material acrylic acid. By setting the ester content to not more than 3.00 mass%, the patent changes the compositional parameter to prevent harmful side reactions during storage while maintaining high production efficiency of hydroxyalkyl acrylate.
3Strength
If alkylene glycol diacrylate is formed, then cross-linking occurs improving resin performance, but gelation and turbidity occur during storage
Solution Approach 1:
The patent applies preliminary action by controlling the ester content in raw materials before production. This preliminary control prevents the formation of excessive alkylene glycol diacrylate during storage, thereby maintaining composition stability and preventing gelation while still allowing controlled cross-linking for resin performance.
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 approach significantly reduces the generation of alkylene glycol diacrylate, enhancing the preservation stability and quality of hydroxyalkyl acrylate, preventing turbidity and gelation, and ensuring the production of high-quality acrylate resins.
Implementation Method 1
reacting acrylic acid with an alkylene oxide in the presence of a catalyst
Implementation Method 2
reacting acrylic acid with an alkylene oxide in the presence of a catalyst
Data Source
AI summary
The hydroxyalkyl acrylate according to the present invention is characterized in that a content amount of an ester generated from acrylic acid dimer and an alkylene oxide is not more than 0.10 mass %. The method for producing a hydroxyalkyl acrylate according to the present invention is characterized in comprising the step of reacting acrylic acid with an alkylene oxide in the presence of a catalyst, wherein a content amount of acrylic acid dimer in the raw material acrylic acid is not more than 3.00 mass %.