Core-Sheath Composite Fiber for Flame-Resistant Artificial Hair
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing artificial hair fibers struggle to achieve a balance between flame resistance, texture, gloss, and combing properties similar to human hair, particularly when using bromine-based flame retardants.
Innovation Solution
A core-sheath conjugate fiber structure with a polyester-based core and polyamide-based sheath, incorporating a bromine-based flame retardant in the core and a phosphorus-based flame retardant in the sheath, along with a flame retardant auxiliary, maintains a total flame retardant content between 20 to 40 parts by weight, ensuring high flame resistance, texture, and gloss similar to human hair.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a large amount of bromine-based flame retardant is added to the sheath resin composition to improve flame resistance, then flame resistance is improved, but texture, gloss, and combing property deteriorate
Solution Approach 1:
The patent divides the flame retardant system into two segments: bromine-based flame retardant placed in the core resin composition and phosphorus-based flame retardant placed in the sheath resin composition. This segmentation allows each flame retardant type to be positioned where it most effectively contributes to flame resistance without adversely affecting the external appearance and texture properties that are primarily determined by the sheath layer.
Solution Approach 2:
The patent applies local quality by concentrating the bromine-based flame retardant in the core region and the phosphorus-based flame retardant in the sheath region. This localized distribution ensures that the flame retardant functions are spatially optimized: the core provides bulk flame resistance while the sheath maintains surface quality and texture similar to human hair.
2Manufacturing precision
If the amount of flame retardant is reduced to maintain texture and gloss similar to human hair, then texture and gloss are improved, but flame resistance deteriorates
Solution Approach 1:
The patent merges two different flame retardant systems (bromine-based and phosphorus-based) into a single composite fiber structure. The bromine-based flame retardant in the core provides primary flame resistance, while the phosphorus-based flame retardant in the sheath provides supplementary flame resistance and synergistic enhancement, together achieving high flame resistance without compromising texture or gloss.
Solution Approach 2:
The patent creates a composite material system where the core resin composition containing bromine-based flame retardant is combined with the sheath resin composition containing phosphorus-based flame retardant. This composite structure integrates the flame retardant properties of both chemical systems while maintaining the aesthetic and tactile properties of human hair through proper sheath formulation.
3Reliability
If total flame retardant content is increased to ensure high flame resistance, then flame resistance is improved, but the fiber properties deviate from human hair characteristics
Solution Approach 1:
The patent optimizes the parameters of flame retardant distribution by specifying that the bromine-based flame retardant is contained in the core resin composition while the phosphorus-based flame retardant is contained in the sheath resin composition. This parameter change in spatial distribution allows achieving high flame resistance with a total flame retardant content of 15-30 parts by weight, which is sufficient to meet safety standards while preserving human hair-like properties.
Data Source
AI summary
A core-sheath conjugate fiber for artificial hair has a core-sheath structure including a core and a sheath covering the core. The core is composed of a core resin composition containing a polyester-based resin, and the sheath is composed of a sheath resin composition containing a polyamide-based resin. The core resin composition contains a bromine-based flame retardant and a flame retardant auxiliary. The sheath resin composition contains a phosphorus-based flame retardant. The phosphorus-based flame retardant contains at least one selected from the group consisting of a zinc phosphinate and a condensed phosphate ester compound.