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Preparation method for multihole fine denier spandex

A technology of fine denier and spandex, which is applied in the field of preparation of porous fine denier spandex, which can solve problems such as being vulnerable to weather erosion, low production efficiency, and limited demand scale, so as to expand the application field and scale of products, improve production efficiency, and prevent adhesion Effect

Active Publication Date: 2015-02-18
ZHEJIANG HUAFENG SPANDEX
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because customers have high requirements on the elastic performance of fine denier products, most of the spandex adopts the production technology with only one hole spinneret, so its production efficiency is relatively low, and the product price is 10,000 to 20,000 yuan / month higher than other specifications. Tons, resulting in high clothing prices, resulting in a certain limit on the demand for fine-denier spandex products; at the same time, in order to reduce production costs, downstream customers often try their best to increase the draft ratio of spandex in the process of weaving, so as to reduce the production cost of low-density fabrics. The spandex content in the fabric makes the spandex in the fabric more susceptible to weather erosion and chemical damage, causing loss of elasticity and deformation of the fabric

Method used

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  • Preparation method for multihole fine denier spandex
  • Preparation method for multihole fine denier spandex
  • Preparation method for multihole fine denier spandex

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Step 1. 237.1kg polytetramethylene ether glycol (molecular weight 1800), 53.9kg 4,4-diphenylmethane diisocyanate are sent to the first reactor at the same time, the reaction time is 2hr, and the reaction temperature is 70°C to obtain the preliminary polymer (PP);

[0031] Step 2. Transport 291kg of prepolymer and 341.5kg of N,N-dimethylacetamide (DMAC) solvent to a high-speed dissolving machine at the same time, and under the action of high-speed shear force, fully dissolve PP to obtain prepolymer solution (PPs);

[0032] Step 3. 632.5kg prepolymer solution and 169.4kg mixed amine DMAC solution (comprising 0.61kg propylenediamine, 4.59kg ethylenediamine, 0.58kg diethylamine, 0.2kg ethanolamine), under the condition of rapid stirring, simultaneously Chain propagation and chain termination occur to prepare a polyallophanate polymer solution;

[0033] Step 4. Add 16.86kg containing antioxidant, lubricant, matting agent, UV absorber in the polyallophanate solution of step...

Embodiment 2

[0037] Step 1. 237.1kg polytetramethylene ether glycol (molecular weight 1800), 54.8kg 4,4-diphenylmethane diisocyanate are sent to the first reactor at the same time, the reaction time is 2hr, and the reaction temperature is 70°C to obtain the preliminary polymer (PP);

[0038] Step 2. Transport 291.8kg of prepolymer and 347.8kg of N,N-dimethylacetamide (DMAC) solvent to the high-speed dissolving machine at the same time, and under the action of high-speed shear force, PP is fully dissolved to obtain the prepolymer Polymer solutions (PPs);

[0039] Step 3. 639.6kg prepolymer solution and 172.5kg mixed amine DMAC solution (comprising 0.59kg propylenediamine, 4.48kg ethylenediamine, 0.51kg diethylamine, 0.21kg ethanolamine), under the condition of rapid stirring, simultaneously Chain propagation and chain termination occur to prepare a polyallophanate polymer solution;

[0040] Step 4. Add 17.12kg containing antioxidant, lubricant, matting agent, UV absorber in the polyalloph...

Embodiment 3

[0044]Step 1. 237.1kg polytetramethylene ether glycol (molecular weight 1800), 54.8kg 4,4-diphenylmethane diisocyanate are sent to the first reactor at the same time, the reaction time is 2hr, and the reaction temperature is 70°C to obtain the preliminary polymer (PP);

[0045] Step 2. Transport 291.8kg of prepolymer and 347.8kg of N,N-dimethylacetamide (DMAC) solvent to the high-speed dissolving machine at the same time, and under the action of high-speed shear force, PP is fully dissolved to obtain the prepolymer Polymer solutions (PPs);

[0046] Step 3. 639.6kg prepolymer solution and 172.5kg mixed amine DMAC solution (comprising 0.55kg propylenediamine, 4.37kg ethylenediamine, 0.49kg diethylamine, 0.39kg ethanolamine), under the condition of rapid stirring, simultaneously Chain propagation and chain termination occur to prepare a polyallophanate polymer solution;

[0047] Step 4. Add 17.55kg containing antioxidant, lubricant, delustering agent, ultraviolet absorber in th...

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Abstract

The invention relates to a preparation method for multihole fine denier spandex. The preparation method is characterized by comprising the steps of (1) in a preparation process, polymerizing polytetramethylene ether glycol PTMG, 4,4-diphenylmethane diisocyanate (4,4-MDI) and diamine which serve as raw materials step by step to obtain a polyurea-based formic ether DMAC solution, adding functional auxiliary agents such as an antioxidant, a lubricating agent, a flatting agent, an ultraviolet absorbing agent and an antiblocking agent, performing spin-stretching, high-temperature drying and oil applying on the polyurea-based formic ether solution containing the auxiliary agents through a multihole spinning plate to obtain multihole fine denier spandex in which single fibers are not adhered to one another, and winding the multihole fine denier spandex to obtain a multihole spandex fiber roll; (2) in a use process, dividing the multihole fine denier spandex into single spandex fibers one by one under a certain stretching condition through a fiber separator, and putting the single spandex fibers into corresponding weaving units to be woven.

Description

technical field [0001] The invention relates to a method for preparing porous fine-denier spandex, which belongs to the technical field of polyurethane elastic fiber material manufacturing and weaving. Background technique [0002] Polyurethane elastic fiber, commonly known as spandex, has excellent elastic properties and can withstand stress. It is known as the "industrial monosodium glutamate" of textiles. A small amount of spandex (generally 6% to 22% ammonia content) is woven into the fabric, which can significantly improve the wear of the fabric. Comfort and aesthetics have therefore become one of the indispensable textile raw materials. Due to the different uses of fabrics and the thickness of fabrics, the requirements for spandex specifications (thickness) are also different. At present, the most common spandex specifications are 20D to 1120D. Among them, 20D spandex is habitually called "spandex" because of its extremely thin thread. "fine denier" spandex. [0003]...

Claims

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Application Information

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IPC IPC(8): D01F6/94D01F1/10C08G18/76C08G18/66C08G18/48C08G18/32D01D5/04D01D11/02
Inventor 温作杨刘亚辉梁红军李燕席青
Owner ZHEJIANG HUAFENG SPANDEX
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