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Skin-core structured polyurethane elastic fiber preparation method

A polyurethane elastic, skin-core structure technology, applied in the direction of fiber type, fiber treatment, fiber chemical characteristics, etc., can solve the problems of poor product uniformity, high requirements on raw materials and equipment, improve uniformity, improve production efficiency, and ensure uniformity. Effect

Active Publication Date: 2018-04-24
ZHEJIANG HUAFENG SPANDEX
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solve the problems of high raw material and equipment requirements and poor product uniformity when preparing polyurethane elastic fibers with skin-core structure

Method used

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  • Skin-core structured polyurethane elastic fiber preparation method
  • Skin-core structured polyurethane elastic fiber preparation method
  • Skin-core structured polyurethane elastic fiber preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Example 1 Low-cost skin-core structure polyurethane elastic fiber

[0045] Step 1. Send 237.10kg of polytetramethylene ether glycol (molecular weight 1800) and 53.90kg of 4,4-diphenylmethane diisocyanate to the first reactor at the same time, the reaction time is 2.2h, and the reaction temperature is 70°C to obtain Prepolymer (PP);

[0046] Step 2. Transport 291.00kg of prepolymer and 341.50kg of N,N-dimethylacetamide (DMAC) solvent to a high-speed dissolving machine at the same time, and high-speed shearing to fully dissolve PP to obtain a prepolymer solution (PPs);

[0047] Step 3. With 632.50kg prepolymer solution and 16.60kg mixed amine DMAC solution (including 0.61kg propylenediamine, 4.59kg ethylenediamine, 0.60kg ethylenediamine), stir rapidly to make chain growth and chain termination occur simultaneously, and prepare Polyurethane-polyurea solution, which is aged to obtain the core layer spinning solution;

[0048] Step 4. Add 5.90kg of antioxidant, UV absorbe...

Embodiment 2

[0053] Example 2 Chlorine-resistant skin-core polyurethane elastic fiber

[0054] Step 1. Send 237.10kg polytetramethylene ether glycol (molecular weight 1800) and 54.20kg 4,4-diphenylmethane diisocyanate to the first reactor at the same time, the reaction time is 2.2h, and the reaction temperature is 75°C. Obtain prepolymer (PP);

[0055] Step 2. Transport 291.30kg of prepolymer and 347.80kg of N,N-dimethylacetamide (DMAC) solvent to a high-speed dissolving machine at the same time, and high-speed shearing makes PP fully dissolved to obtain prepolymer solution (PPs);

[0056] Step 3. 639.10kg of prepolymer solution and 17.20kg of mixed amine DMAC solution (including 0.61kg of propylenediamine, 5.19kg of ethylenediamine, and 0.60kg of ethylenediamine) were stirred rapidly so that chain growth and chain termination occurred simultaneously to prepare Polyurethane-polyurea solution, which is aged to obtain the core layer spinning solution;

[0057] Step 4. Add 5.90kg of antioxi...

Embodiment 3

[0062] Example 3 Hydrophilic skin-core structure polyurethane elastic fiber

[0063] Step 1. Send 237.10kg polytetramethylene ether glycol (molecular weight 1800) and 54.20kg 4,4-diphenylmethane diisocyanate to the first reactor at the same time, the reaction time is 2.2h, and the reaction temperature is 75°C. Obtain prepolymer (PP);

[0064] Step 2. Transport 291.30kg of prepolymer and 347.80kg of N,N-dimethylacetamide (DMAC) solvent to a high-speed dissolving machine at the same time, and high-speed shearing makes PP fully dissolved to obtain prepolymer solution (PPs);

[0065]Step 3. 639.10kg of prepolymer solution and 17.20kg of mixed amine DMAC solution (including 0.61kg of propylenediamine, 5.19kg of ethylenediamine, and 0.60kg of ethylenediamine) were stirred rapidly so that chain growth and chain termination occurred simultaneously to prepare Polyurethane-polyurea solution, which is aged to obtain the core layer spinning solution;

[0066] Step 4. Add 5.90kg of antio...

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Abstract

The invention discloses a skin-core structured polyurethane elastic fiber preparation method. By adjustment of types and contents of skin and core layer spinning solution auxiliary agents, the auxiliary agents are enriched on a skin layer, and improvement of fiber environmental tolerance, changing of fiber surface properties and reduction of auxiliary agent utilization cost are realized. Skin-corestructured polyurethane elastic fiber preparation is characterized by including steps: 1) preparing N,N-dimethylacetamide solution of polyurethane-polyurea, aging to obtain core layer spinning solution, adopting a spinneret plate for spin stretching, and performing high-temperature drying through a first passage to obtain core layer polyurethane elastic fibers; 2) taking part of polyurethane-polyurea solution, and adding auxiliary agents for improvement of fiber environmental tolerance or changing of fiber surface properties to obtain skin layer spinning solution, coating the core layer fibersurface with the skin layer spinning solution through a special-structure coating device, performing high-temperature drying through a second passage, and carrying out oiling and winding forming to obtain skin-core structured polyurethane elastic fibers.

Description

technical field [0001] The invention belongs to a preparation method of polyurethane elastic fibers, in particular to a preparation method of polyurethane elastic fibers with a skin-core structure. Background technique [0002] Polyurethane elastic fiber, referred to as spandex, is a kind of elastic synthetic fiber with high elongation at break, high elastic recovery rate, corrosion resistance, anti-aging, heat resistance, fatigue resistance and other excellent properties, and is widely used in the textile industry. With the continuous improvement of consumers' requirements for fabric comfort, conventional polyurethane elastic fibers can no longer meet market requirements, and the development of differentiated polyurethane elastic fibers has become the general trend. Through the skin-core structure, the development of differentiated polyurethane elastic fibers can be promoted. Skin-core structure polyurethane elastic fiber is composed of cortex and core. The cross-section i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D06M15/568D01F6/94C08G18/66C08G18/48C08G18/32D06M101/38
CPCC08G18/3228C08G18/4854C08G18/6685D01F6/94D06M15/568D06M2101/38
Inventor 孔懿阳杨晓印温作杨邵晓林池晓智赵婧
Owner ZHEJIANG HUAFENG SPANDEX
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