Functionalized Polyether Additive for Unsaturated Resin Phase Separation
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Solution Overview
Problem
Low profile additives in unsaturated resin molding compositions tend to phase separate from unsaturated monomers, leading to issues like shrinkage, surface unevenness, and residual manufacturing stresses, which complicates the molding process and affects the quality of molded articles.
Innovation Solution
A reaction product of a functionalized polyether with an aminic polybasic species is used as an additive to prevent phase separation, ensuring the low profile additives remain dispersed throughout the resin, stabilizing the mixture for extended periods and allowing for more flexible processing times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If low profile additives are dispersed in unsaturated monomer, then shrinkage and surface unevenness are reduced, but phase separation occurs during storage and processing
Solution Approach 1:
A polyether functionalized with an aromatic group containing a carboxylic acid group serves as a compatibilizing agent or intermediary substance. This mediator prevents phase separation between the low profile additive (thermoplastic polymer) and the unsaturated monomer by forming compatible interactions with both phases, thereby maintaining dispersion stability during storage and processing while preserving the low shrinkage and smooth surface properties
Solution Approach 2:
The invention creates a composite molding composition system that integrates four components: (a) unsaturated polyester resin, (b) low profile additive (thermoplastic polymer), (c) polyether functionalized with aromatic group containing carboxylic acid group (compatibilizer), and (d) reactive diluent. This composite formulation achieves synergistic effects where the compatibilizer enables stable dispersion of the thermoplastic polymer in the unsaturated resin system, preventing phase separation while maintaining the desired low shrinkage and surface quality properties
2Stability of the object's composition
If polyether functionalized with aromatic group is added as dispersant, then phase separation is prevented, but device complexity increases
Solution Approach 1:
The polyether functionalized with an aromatic group containing a carboxylic acid group performs multiple functions simultaneously: (1) acts as a dispersant to prevent phase separation of low profile additives, (2) serves as a compatibilizing agent to ensure compatibility between thermoplastic polymer and unsaturated resin, and (3) can participate in the curing reaction system. This multi-functionality reduces the need for separate additives and simplifies the overall formulation despite the sophisticated molecular structure
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 additive effectively prevents phase separation of low profile additives in unsaturated resin molding compositions, reducing shrinkage and surface unevenness, and enabling the production of molded articles with precise dimensions and smooth surfaces, even when stored or processed over extended periods.
Implementation Method 1
a reaction product of a functionalized polyether of a formula: R1-(OCδH2δ)x-(OCH2CH2)y-W-φ-COOH with an aminic polybasic species
Data Source
AI summary
The present invention relates to an additive to prevent phase separation between a low profile additive and the other components of the molding composition, said other components comprising at least an unsaturated resin and an unsaturated monomer.