Fiber-Reinforced Polypropylene Resin Composition for Balanced Rigidity and Surface Finish
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Solution Overview
Problem
Current polypropylene resin compositions face challenges in achieving a balance of high rigidity, soft surface texture, reduced weld lines, and good grain transfer characteristics, which are essential for applications like automobile interior parts, while also maintaining high heat resistance.
Innovation Solution
A fiber-reinforced polypropylene resin composition is developed, comprising a propylene-ethylene random copolymer with specific properties and optionally including a propylene-ethylene block copolymer, thermoplastic elastomer, and propylene polymer resin, which are combined in specific proportions to produce a molded article with improved grain transfer characteristics, soft surface texture, reduced weld lines, and high heat resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If filler such as glass fiber or talc is incorporated into the resin composition to improve rigidity, then the rigidity and mechanical strength are improved, but the grain transfer characteristics and surface texture are deteriorated
Solution Approach 1:
The patent applies parameter changes by carefully controlling the fiber content within 10-50 parts by weight relative to 100 parts by weight of the polypropylene resin, and by specifying fiber length (2-20mm for glass fiber, 1-20mm for carbon fiber) and diameter ranges. These parameter optimizations balance rigidity enhancement with maintained grain transfer characteristics, resolving the contradiction between strength improvement and manufacturing precision.
Solution Approach 2:
The patent employs composite materials by combining polypropylene resin with specifically treated fibers (glass fiber or carbon fiber). The fibers undergo surface treatment with silane coupling agents or titanate coupling agents to create a composite structure that enhances rigidity while maintaining good interfacial bonding and surface quality, thus resolving the contradiction between strength and grain transfer characteristics.
2Strength
If filler is incorporated into the resin composition to improve rigidity, then the mechanical strength is improved, but the surface texture softness is deteriorated
Solution Approach 1:
The patent optimizes the fiber content parameter within 10-50 parts by weight relative to 100 parts by weight of polypropylene resin, and specifies fiber dimensional parameters (length and diameter ranges). This controlled parameter approach achieves enhanced mechanical strength while preserving surface texture softness, resolving the contradiction between strength improvement and surface texture maintenance.
Solution Approach 2:
The patent creates a composite material system using polypropylene resin combined with surface-treated fibers. The surface treatment with coupling agents ensures good interfacial adhesion, allowing the composite to achieve high mechanical strength while maintaining the soft surface texture characteristic of polypropylene, thus resolving the contradiction between strength and surface texture.
3Temperature
If fiber-reinforced composition is used to improve rigidity, then the heat resistance is improved, but the weld lines and appearance quality are deteriorated
Solution Approach 1:
The patent optimizes fiber content within 10-50 parts by weight relative to 100 parts by weight of polypropylene resin, and specifies fiber dimensional parameters (length 2-20mm for glass fiber, 1-20mm for carbon fiber, and diameter ranges). These parameter controls enable the composition to achieve improved heat resistance while minimizing weld line formation and maintaining appearance quality, resolving the contradiction between heat resistance and appearance quality.
Solution Approach 2:
The patent employs a composite material system of polypropylene resin with surface-treated fibers. The surface treatment with silane or titanate coupling agents improves interfacial adhesion and reduces void formation at weld lines, allowing the composite to achieve enhanced heat resistance while maintaining good appearance quality, thus resolving the contradiction between heat resistance and appearance.
Data Source
Figure 1
AI summary
Provided are a fiber-reinforced polypropylene resin composition, and a molded article prepared therefrom having good grain transfer characteristics, a good appearance, a soft surface texture, high rigidity, and high heat resistance. The fiber-reinforced polypropylene resin composition contains a specific propylene-ethylene random copolymer and a specific fiber, and optionally contains a propylene-ethylene block copolymer satisfying four conditions, such as sequential polymerization in the presence of a metallocene catalyst, a thermoplastic elastomer satisfying two conditions, such as MFR, and a specific propylene polymer resin.