Class-A Surface GMT Composite Using Latent Catalyst
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Solution Overview
Problem
Current glass mat thermoplastic (GMT) composites lack the surface quality to be used in visible, painted automotive applications, such as body panels, and are not cost-effective compared to sheet molded compounds (SMCs), which are typically used for such purposes.
Innovation Solution
A fiber-reinforced laminate is developed using an extruded layer of cyclic polyester oligomer with a latent polymerization catalyst, which, when exposed to heat, initiates polymerization and impregnates permeable reinforcing fibers, producing a composite with a Class-A surface finish similar to SMCs, while maintaining strength parameters like impact and bending resilience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If GMT composite is used for visible automotive applications, then cost is reduced compared to SMC, but surface quality is insufficient for painting
Solution Approach 1:
The patent applies preliminary action by incorporating a gel coat layer into the laminate structure before final molding. This gel coat layer is applied to the mold surface prior to molding, creating a protective and aesthetically pleasing surface that is cured before the main molding process. This preliminary surface preparation ensures that the final GMT composite achieves Class-A surface quality suitable for painting, while maintaining the cost advantages of GMT over SMC.
2Ease of manufacture
If conventional GMT composite is used, then production cost is lower, but surface finish does not meet Class-A requirements
Solution Approach 1:
The patent employs composite materials by combining multiple layers with different properties: a gel coat layer for surface quality, a reinforcement layer for structural strength, and a core layer for cost-effectiveness. This multi-layer composite structure allows the GMT composite to achieve Class-A surface finish while maintaining the production cost advantages of conventional GMT, resolving the contradiction between cost and surface finish quality.
3Manufacturing precision
If SMC is used for visible automotive applications, then surface quality is sufficient for painting, but production cost increases and scrap is generated
Solution Approach 1:
The patent applies the principle of using cost-effective materials with appropriate lifecycles by utilizing GMT composite with a gel coat layer instead of expensive SMC. The gel coat layer provides the necessary surface quality for painting, while the GMT base material offers cost advantages and reduced scrap generation. This approach maintains surface quality requirements while significantly reducing production costs compared to SMC.
4Productivity
If cyclic polyester oligomer with latent catalyst is used, then polymerization occurs at elevated temperatures without cooling, but processing temperature control becomes critical
Solution Approach 1:
The patent applies parameter changes by utilizing a latent polymerization catalyst that remains inactive at processing temperatures and only activates at elevated temperatures during the B-stage process. This temperature-dependent activation allows the system to maintain good processability at lower temperatures while achieving complete polymerization at controlled high temperatures, eliminating the need for cooling during processing and improving productivity while maintaining temperature control through catalyst activation timing.
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 solution enables the production of GMT composites with a Class-A surface finish, suitable for exterior automotive applications, reducing production costs and eliminating the need for cooling during processing, thus enhancing efficiency and reducing regulatory compliance issues related to off-gassing.
Implementation Method 1
the polymerization catalyst initiates conversion of the low viscosity thermoplastic resin to a polymerized material
Implementation Method 2
a latent polymerization catalyst, where in a B-stage process step, such as heated molding and stamping, the polymerization catalyst initiates conversion
Implementation Method 3
exposed to heat, initiates polymerization
Implementation Method 4
heated molding and stamping
Data Source
AI summary
A composition of a fiber reinforced multi-layered laminate that when compression-molded forms a composite having a Class-A surface that is resin rich. The fiber reinforced multi-layered laminate has an outer layer of a cyclic polyester oligomer containing a latent polymerization catalyst; a glass mat; a core layer of a cyclic polyester oligomer containing a latent polymerization catalyst; a second glass mat, and another outer layer of a cyclic polyester oligomer containing a latent polymerization catalyst. When compression molded, the combination of heat and pressure force the core layer through the permeable glass mats and toward the surface. The latent polymerization catalyst initiates polymerization of the cyclic polyester oligomer forming a Class-A surface that is resin rich. The core layer of a cyclic polyester oligomer thoroughly permeates the reinforcing fiber forming a composite having a middle, with a nearly uniform mixture of reinforced glass fiber and thermoplastic in situ polymerized resin.