A production method for efficiently preparing flame-retardant monofilaments

By surface activation treatment of polyamide matrix materials and construction of chemical bonding interface transition layers, combined with gradient distribution and synergistic dispersion of nano-reinforcing phases, the problems of unstable flame retardant properties and decreased mechanical properties of flame retardant monofilaments were solved, and efficient and stable production of flame retardant monofilaments was achieved.

CN120967535BActive Publication Date: 2026-05-26GUANGDONG JIASHUO NYLON TECH CO LTD
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Patent Information

Application Number
CN202511092091.0
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2025-08-05
Publication Date
2026-05-26
Estimated Expiration
2045-08-05

AI Technical Summary

Technical Problem

In the existing technology, the flame retardant properties of flame-retardant monofilaments are unstable, the flame retardant is unevenly dispersed and has weak bonding with the matrix material, resulting in decreased mechanical properties, low production efficiency, and difficulty in meeting long-term use requirements, especially for polyamide materials.

Method used

The polyamide matrix material is activated by controlled atmosphere radio frequency plasma to introduce carboxyl active functional groups. A chemical bonding interface transition layer is constructed using a reactive silane coupling agent. A microwave-airflow combined drying system and a differentiated flow channel spinning component are used to form a gradient distribution of flame retardant. The flame retardant is synergistically dispersed with the topologically structured nano-reinforcing phase. Finally, flame retardant monofilaments are prepared by segmented temperature-controlled stretching and thermal relaxation processes.

Benefits of technology

It achieves strong bonding between flame retardant and matrix material, maximizes flame retardant efficiency, maintains the mechanical properties of the core layer, and improves production efficiency and product performance stability, solving the problems of poor flame retardancy, low mechanical properties, and low production efficiency.

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Abstract

This invention relates to the field of fiber preparation technology and discloses a highly efficient method for preparing flame-retardant monofilaments. The method includes: surface activation of a polyamide matrix using radio frequency plasma to directionally introduce carboxyl functional groups; surface grafting modification of a composite flame-retardant masterbatch using a silane coupling agent to construct an interfacial transition layer; controlling the moisture content of the raw materials using a microwave-airflow combined drying system; achieving a gradient distribution of the flame retardant using a dual-channel spinning assembly; synergistically dispersing the nano-reinforcing phase and the flame retardant to construct a three-dimensional network structure, and forming nascent monofilaments using the spinning assembly; controlling the crystal structure through two-stage stretching involving wetting pre-orientation and dry heat main orientation; and stabilizing the fiber structure using a segmented temperature-controlled thermal relaxation process to obtain a finished monofilament product with flame-retardant properties. This invention achieves efficient and continuous production of flame-retardant monofilaments through the synergistic effect of plasma activation, gradient spinning, and staged orientation.
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