Carbon Fiber Resin Composition for Flowable High-Strength Molding
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Solution Overview
Problem
Molded articles are increasingly demanding high moldability with a balance between excellent flowability and mechanical properties, particularly challenging for carbon fiber-reinforced resins due to fiber interference during molding, which hinders the production of smaller, thinner, and more complicated shapes.
Innovation Solution
A fiber-reinforced resin composition with carbon fibers and a thermoplastic resin, optimized by controlling the fiber length distribution, long-to-short fiber ratio, and incorporating recycled fibers, to enhance flowability while maintaining mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If carbon fibers are used to improve mechanical properties, then tensile strength and elastic modulus are enhanced, but flowability deteriorates due to fiber interference during molding
Solution Approach 1:
The invention segments the carbon fiber population into two distinct groups: long fibers (0.6mm or more) for mechanical strength and short fibers (0.1mm or less) for flowability. This segmentation allows each fiber length to fulfill its specific function without compromising the other, resolving the contradiction between strength and flowability.
Solution Approach 2:
The invention applies local quality by having different fiber lengths occupy different functional roles within the composite material. Long fibers provide structural reinforcement in specific regions, while short fibers facilitate flow in other regions. This localized functional differentiation enables simultaneous optimization of both mechanical properties and processability.
2Strength
If fiber length is increased to improve mechanical properties, then strength is enhanced, but flowability decreases due to increased fiber interference
Solution Approach 1:
The invention divides the fiber population by length into functional groups: long fibers (0.6mm+) for strength and short fibers (0.1mm-) for moldability. This segmentation enables the material to exhibit both high strength and good flowability, as short fibers facilitate molding while long fibers provide structural integrity.
Solution Approach 2:
The invention creates a composite fiber system combining two types of carbon fibers with different length characteristics. This composite approach leverages the complementary properties of short and long fibers to achieve both improved moldability and maintained mechanical strength, overcoming the limitations of single-fiber-length materials.
Data Source
AI summary
A fiber-reinforced resin molded article containing carbon fibers (A) and a thermoplastic resin (B), characterized in that the carbon fibers (A) are contained at an amount of 5-40 parts by weight with respect to a total of 100 parts by weight of the carbon fibers (A) and the thermoplastic resin (B), and the carbon fibers (A) are such that 1,000 carbon fibers (A) randomly selected from a molded article have a fiber length long/short ratio, determined by the following equation 1, of 2 or more and 20 or less. Fiber length long/short ratio = Σ (L0.6)/Σ (L0.1)···(Equation 1) L0.6: length of fiber having a fiber length of 0.6 mm or more (mm) L0.1: length of fiber having a fiber length of 0.1 mm or less (mm) The present invention makes it possible to provide a fiber-reinforced resin molded article that can achieve both excellent flowability and mechanical properties and also has an excellent appearance quality, and a fiber-reinforced resin molding material that realizes this.