Vinyl Ester Powder Pre-Preg Low-Temperature Curing
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Solution Overview
Problem
Current structural composite production methods using unsaturated polyester resins face challenges with high volatile emissions and skin sensitization issues, particularly with styrene, and require high processing temperatures and long cure cycles, limiting productivity and safety.
Innovation Solution
A novel pre-preg concept using a solid vinyl ester resin powder, which is micronized and cured at lower temperatures without styrene or other diluents, allowing for reduced emissions and improved processing efficiency, incorporating additives for enhanced properties like fire retardancy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If unsaturated polyester resin with styrene is used, then the resin can be processed and cured effectively, but high volatile emissions and skin sensitization issues occur
Solution Approach 1:
The patent extracts and removes the harmful styrene diluent from the resin system, replacing it with a monomer-free vinyl ester resin composition. This extraction eliminates the source of volatile emissions and skin sensitization while maintaining the resin's processing and curing capabilities through alternative chemistry.
Solution Approach 2:
The patent changes the chemical parameters of the resin system by transitioning from styrene-based unsaturated polyester to monomer-free vinyl ester resin. This parameter change includes modifying the molecular structure and composition to eliminate harmful volatile organic compounds while preserving essential processing properties.
2Productivity
If conventional pre-preg methods are used, then structural composite parts can be produced, but high processing temperatures and long cure cycles are required
Solution Approach 1:
The patent changes the curing temperature parameter by introducing a low-processing-temperature catalyst system that enables effective curing at reduced temperatures. This parameter modification shortens the cure cycle and reduces energy requirements while maintaining structural integrity of the composite parts.
Solution Approach 2:
The patent incorporates the curing catalyst into the resin composition during pre-preg manufacturing, preparing the system in advance for low-temperature curing. This preliminary action enables the resin to cure effectively at lower temperatures during the final processing stage, improving productivity and reducing thermal stress.
3Object-affected harmful factors
If alternative vinyl aromatic monomers are used, then styrene emissions are reduced, but the regulatory status remains similar and skin sensitization issues persist
Solution Approach 1:
The patent extracts and eliminates all vinyl aromatic monomers from the resin system, going beyond simply replacing styrene with alternative monomers. This complete extraction of harmful aromatic compounds ensures regulatory compliance and eliminates skin sensitization risks associated with both styrene and alternative vinyl aromatics.
Solution Approach 2:
The patent uses a monomer-free vinyl ester resin system that relies on crosslinking rather than monomer polymerization, effectively replacing the need for harmful monomers with a different chemical mechanism that achieves the same structural outcome without the toxicological drawbacks.
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 significantly reduces workplace emissions, minimizes skin sensitization risks, and offers improved processing benefits, including lower processing temperatures and increased structural strength, making it suitable for various applications such as marine, building, and industrial sectors.
Implementation Method 1
The powder is then used to impregnate the fibre reinforcement... The pre-preg thus obtained can now be stored, transported or used by a processor to produce a structural component
Data Source
AI summary
The invention provides a powder pre-preg comprising as sole resin a vinyl ester resin having a Tg in the range of −5 to +30° C. and a melt viscosity @100° C. in the range of 2 to 75 dPa·s, which can be used in making a composite at a temperature as low as 80° C.