Polymer Alloy Fiber Diameter Control via Compatibilizer
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Solution Overview
Problem
Conventional polymer alloy fibers made from polyolefins and polyesters suffer from poor mechanical characteristics, wear resistance, and significant dyeing specks due to low compatibility between the component polymers, resulting in large fiber diameter variations and quality issues.
Innovation Solution
A polymer alloy fiber comprising a polyolefin, a polyester, and a styrene-ethylene-butylene-styrene copolymer with specific weight ratios and functional groups, forming a sea-island structure to enhance compatibility and interfacial adhesion, thereby reducing fiber diameter variation and improving mechanical properties and wear resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a polymer alloy is formed of polyolefin and polyester to combine their advantages, then the material shows improved properties, but the low compatibility between component polymers causes deterioration in mechanical characteristics and wear resistance
Solution Approach 1:
A compatibilizer comprising a polyolefin grafted with a specific amount of a compound having a carboxyl group or a hydroxyl group is used as an intermediary between polyolefin and polyester. This compatibilizer improves interfacial adhesion and compatibility between the two polymers, preventing deterioration in mechanical characteristics while maintaining the combined advantages of both materials.
Solution Approach 2:
The invention creates a composite material system consisting of polyolefin, polyester, and a specifically designed compatibilizer. This composite structure allows the component polymers to compensate for each other's shortcomings while the compatibilizer ensures proper interfacial bonding, achieving both versatility and mechanical strength.
2Productivity
If polyethylene terephthalate and polypropylene are used to form nonwoven fabric by meltblowing, then production is effective, but the low compatibility results in large fiber diameter variation and poor quality with significant dyeing specks
Solution Approach 1:
The compatibilizer acts as a mediator during the meltblowing process, ensuring uniform mixing and dispersion of polyethylene terephthalate and polypropylene. This results in consistent fiber diameter throughout the nonwoven fabric while maintaining high production efficiency, and eliminates dyeing specks by preventing polymer phase separation.
3Ease of manufacture
If aliphatic polyester and polyolefin are combined with a compatibilizer, then injection molding is easy, but the insufficient compatibility still causes large fiber diameter variations in melt spinning
Solution Approach 1:
The compatibilizer with specifically controlled grafting amount serves as an effective intermediary that provides sufficient compatibility for both injection molding and melt spinning processes. It ensures uniform fiber diameter in melt spinning while maintaining the ease of injection molding, overcoming the insufficient compatibility of simple aliphatic polyester and polyolefin blends.
Data Source
AI summary
Provided is a polymer alloy fiber that comprises a polyolefin (A), a polyester (B) and a styrene-ethylene-butylene-styrene copolymer (C), and is characterized by the fiber diameter CV% being 0.1 - 2.5% and the dispersion diameter of island components in the fiber cross-sectional surface being 1 - 1000 nm. It is possible to provide a polymer alloy fiber that is provided with the characteristics of both polyolefin and polyester, in which variations in fiber diameter among single threads are suppressed and also dyeing unevenness are suppressed, that has superior mechanical characteristics and abrasion resistance, and that can be suitably used for a fiber structure.