Polymer PI fiber thermal insulation cotton and preparation method thereof

The high-polymer PI fiber insulation cotton has a three-layer structure. The inner layer is composed of PI fiber and polyvinyl alcohol fiber, the middle layer is composed of modified PI fiber and core-sheath composite fiber, and the outer layer is composed of PI fiber, aramid fiber and low-melting-point fiber. This structure solves the problems of insufficient heat insulation performance, water resistance and comfort of PI fiber insulation cotton, and achieves high-efficiency heat insulation, durability and comfort.

CN122013440APending Publication Date: 2026-05-12JIAXING NATURAL SANHE NEW MATERIAL TECH CO LTD
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Patent Information

Application Number
CN202610318162.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-03-16
Publication Date
2026-05-12

AI Technical Summary

Technical Problem

PI fiber insulation cotton has shortcomings in terms of heat preservation performance, water resistance and comfort. It has high thermal conductivity, unstable fiber morphology, is prone to clumping, and has a hard feel and insufficient softness, which affects its application in close-fitting textiles.

Method used

The insulation cotton uses a three-layer structure of high-polymer PI fiber. The inner layer is composed of PI fiber and polyvinyl alcohol fiber, the middle layer is composed of modified PI fiber and core-sheath composite fiber, and the outer layer is composed of PI fiber, aramid fiber and low-melting-point fiber. A porous structure is formed by modifiers and pore-forming agents. The low-melting-point components between the fiber layers are bonded to each other to form a continuous interface, which improves structural stability and comfort.

Benefits of technology

It improves the long-term heat preservation efficiency, water resistance stability and breathability and resilience of thermal insulation cotton, improves the soft touch and fatigue resistance of fibers, and enhances the hydrophobicity and structural integrity of fibers.

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Abstract

The invention discloses polymer PI fiber heat preservation cotton and a preparation method thereof.The heat preservation cotton comprises an inner layer, a middle layer and an outer layer, the inner layer comprises PI fibers and polyvinyl alcohol fibers, the middle layer comprises the PI fibers and skin-core composite fibers, and the outer layer comprises the PI fibers, aramid fibers and low-melting-point fibers; the middle layer PI fiber is a modified PI fiber, and the preparation of the modified PI fiber comprises the following steps: under a nitrogen protection atmosphere, polymerizing pyromellitic dianhydride and 4, 4 '-diaminodiphenyl ether in N, N-dimethylacetamide to obtain a polyamide acid solution; adding phenylacetylene-terminated hyperbranched polysiloxane, fluorinated graphene oxide, a surfactant and a pore-forming agent into the polyamide acid solution, and reacting to obtain a modified polyamide acid spinning solution; and carrying out dry spinning and thermal forming treatment on the modified polyamide acid spinning solution to obtain the modified PI fiber. The obtained heat preservation cotton has the characteristics of heat preservation, washing resistance and comfort.
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