Polypropylene Polybutene-1 Filler Compositions Creep Resistance
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Solution Overview
Problem
Existing polyolefin compositions with fillers face challenges in achieving a balance between high Melt Flow Rate (MFR) and favorable mechanical properties, particularly in terms of creep resistance and mold filling ability, especially when complex designs are involved.
Innovation Solution
Incorporating a polybutene-1 component in polypropylene-based compositions with fillers, where the polypropylene component is blended with propylene homopolymers and copolymers, and the polybutene-1 component is added in specific proportions to enhance MFR and mechanical properties without degrading the polymers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If filler content is increased to improve mechanical properties and creep resistance, then mechanical strength and dimensional stability improve, but melt flow rate decreases and processability worsens
Solution Approach 1:
The patent applies parameter changes by carefully controlling the composition ratios of polypropylene (10-75 wt%), polybutene-1 (3-50 wt%), and filler (20-80 wt%), along with adjusting processing parameters such as extrusion temperature and screw speed, to achieve optimal balance between mechanical properties and melt flow rate
Solution Approach 2:
The patent creates a composite material system combining polypropylene, polybutene-1, and filler in specific proportions. This composite approach allows the synergistic effects of different materials: polypropylene provides structural framework, polybutene-1 enhances flexibility and processability, while filler improves mechanical strength and creep resistance
2Reliability
If polybutene-1 component is added to improve creep resistance and mold filling ability, then mechanical performance and flow characteristics improve, but composition complexity increases
Solution Approach 1:
The patent optimizes the weight percentage of polybutene-1 component within 3-50% of the total composition, finding the optimal balance between improving creep resistance and mold filling ability while minimizing composition complexity
Solution Approach 2:
The patent ensures homogeneous distribution of polybutene-1 within the polypropylene-filler matrix through proper mixing and blending processes, creating a uniform composite material that simplifies processing while maintaining improved mechanical properties
Data Source
AI summary
Filled polyolefin compositions comprising:A) from 10% to 75% by weight of a polypropylene component;B) from 20% to 80% by weight of a filler;C) from 3% to 50% of a polybutene-1 component;wherein the percentages of A), B) and C) are referred to the sum of A) B) and C).