Coated fiber and method
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Solution Overview
Problem
The use of fillers in polymeric composites, particularly fibrous fillers, often results in inconsistent physical and rheological properties due to dispersion issues and delamination, requiring costly processing adjustments and hazardous treatments, which complicates the production of composites with desirable properties.
Innovation Solution
A coated fiber comprising a fiber with a denier of 250 to 3,000 and a branched polyethylene imine coating, where the fiber constitutes 80 to 99.8% and the coating 0.2 to 20% by weight, facilitating efficient dispersion and consistent properties in polymeric composites.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If fibrous fillers are added to improve mechanical properties, then strength and durability are improved, but dispersion consistency and processing ease deteriorate
Solution Approach 1:
A coating composition comprising a reactive silane and a reactive isocyanate is applied as an intermediary layer on the fibrous filler surface. This coating acts as a mediator that chemically bonds to both the fiber and the polymer matrix, improving interfacial adhesion and dispersion consistency while maintaining mechanical strength enhancement
Solution Approach 2:
The invention creates a composite structure where the fibrous filler is coated with a dual-reactive system (silane-isocyanate complex). This composite coating material combines the benefits of chemical bonding (silane) and physical adhesion (isocyanate), enabling consistent dispersion and processing while preserving reinforcement effectiveness
2Strength
If filler loading is increased to achieve desirable physical properties, then mechanical performance is improved, but processing difficulty increases
Solution Approach 1:
The reactive coating serves as an intermediary that reduces filler-filler interactions and improves filler-matrix compatibility. This allows higher filler loadings to be achieved without proportionally increasing processing complexity, as the coating prevents agglomeration and facilitates uniform distribution even at high concentrations
3Reliability
If conventional filler treatments are applied to prevent delamination, then adhesion is improved, but safety hazards and process complexity increase
Solution Approach 1:
The invention merges two separate treatment steps (silane coating and isocyanate coating) into a single combined application. The coating composition contains both reactive components that work synergistically to prevent delamination, reducing the number of processing steps and minimizing exposure to hazardous materials while maintaining reliable adhesion
Data Source
AI summary
A coated fiber for polymer reinforcement is disclosed. The coated fiber comprises a fiber and a coating disposed about said fiber. The fiber has a denier of from about 250 to about 3,000. The coating comprises a branched polyethylene imine. The fiber is present in the coated fiber in an amount of from about 80 to about 99.8 percent by weight and the coating is present in the coated fiber in an amount of from about 0.2 to about 20 percent by weight, with percent by weight based on the total weight of the coated fiber. A method of producing the coated fiber is also disclosed.