Vinyl-Containing Compounds Reducing Styrene Emissions
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Solution Overview
Problem
Current methods for reducing styrene emissions in open mold processes using thermosetting resins face challenges such as slower reactivity, incomplete curing, higher costs, and compromised physical properties, while also generating hazardous byproducts and requiring additional processing steps.
Innovation Solution
A process involving reacting a dicarboxylic acid or anhydride with a polyhydric alcohol under a nitrogen atmosphere, followed by reacting the hydroxyl-containing polyester with a vinyl-containing organic acid in the presence of an esterification catalyst and azeotropic agent, and then with an epoxy to form vinyl-containing compounds, which reduces the need for multiple processing steps and minimizes hazardous air pollutants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If styrene is replaced by another reactive diluent, then styrene emissions are reduced, but reactivity becomes slower and curing becomes incomplete
Solution Approach 1:
The patent changes the chemical structure parameters by using vinyl-containing organic acids with specific molecular weights and structures. This allows maintaining high reactivity and complete curing while reducing styrene emissions, as the vinyl groups provide sufficient reactivity without requiring high styrene content
Solution Approach 2:
The patent creates a composite system combining hydroxyl-containing polyester with vinyl-containing organic acid and epoxy. This composite approach enables complete curing and high reactivity through the synergistic reaction of multiple components, eliminating the need for high styrene content while ensuring reliable curing
2Object-affected harmful factors
If the amount of styrene or reactive diluent is reduced, then emissions are minimized, but viscosity increases making handling difficult
Solution Approach 1:
The patent optimizes the molecular weight and structure parameters of the vinyl-containing organic acid to achieve the right balance between reactivity and viscosity. By selecting appropriate molecular weights, the system maintains low viscosity for easy handling while using minimal styrene content to reduce emissions
3Ease of operation
If low molecular weight polymers are used, then viscosity decreases improving handling, but physical properties of final products are compromised
Solution Approach 1:
The patent carefully controls the molecular weight parameter of the hydroxyl-containing polyester and the degree of vinyl group incorporation. This allows achieving optimal balance where the polymer has sufficient chain length for good physical properties while maintaining low enough viscosity for easy handling through the vinyl-containing organic acid modification
4Object-affected harmful factors
If waxes are added to limit diluent vapor elimination, then emissions are controlled, but interlaminate bonding becomes poor
Solution Approach 1:
The patent extracts and eliminates the need for wax additives by using a fundamentally different chemical approach. The vinyl-containing organic acid reacts with the hydroxyl-containing polyester and epoxy to form a crosslinked network that controls emissions through chemical reaction rather than physical barrier, thereby maintaining good interlaminate bonding
5Productivity
If high reaction temperatures are used in esterification, then ester yield improves, but color becomes dark requiring washing
Solution Approach 1:
The patent changes the reaction temperature parameter and catalyst selection to operate at lower temperatures while maintaining high ester yield. By optimizing these parameters, the reaction proceeds efficiently without generating the dark color byproducts that form at high temperatures, eliminating the need for washing steps
6Manufacturing precision
If multiple processing steps are used in prior art processes, then purification is achieved, but time and complexity increase
Solution Approach 1:
The patent merges multiple processing steps into a single integrated reaction process. The esterification, crosslinking, and purification occur in one operation, eliminating the need for separate extraction, washing, and filtration steps. This unified approach achieves the required purification while significantly reducing processing time and complexity
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 vinyl-containing compounds with low color, high reactivity, and reduced styrene content, enabling room temperature crosslinking without the need for extraction or washing, and maintains excellent mechanical properties.
Implementation Method 1
reacting the hydroxyl-containing polyester with a vinyl-containing organic acid in the presence of an esterification catalyst
Implementation Method 2
reacting the hydroxyl-containing polyester with a vinyl-containing organic acid in the presence of an esterification catalyst and an azeotropic agent
Implementation Method 3
reacting the vinyl functional esterified intermediate, residual esterification catalyst and residual vinyl-containing organic acid with an epoxy to provide the vinyl-containing compound
Data Source
AI summary
The present invention provides a process for forming vinyl-containing compounds including the steps of: a) reacting in a nitrogen atmosphere a dicarboxylic acid and/or anhydride and a functional mono or polyfunctional alcohol to provide a hydroxyl-containing polyester; b) reacting the hydroxyl-containing polyester with a vinyl-containing organic acid in the presence of an esterification catalyst, a polymerization inhibitor and an azeotropic agent; and c) reacting the vinyl functional esterified intermediate, residual esterification catalyst and residual vinyl-containing organic acid with an epoxy to provide the vinyl-containing compound.