Preparation method of heat resistant spandex fiber

A spandex fiber, heat-resistant technology, applied in the direction of fiber chemical characteristics, textiles and papermaking, single-component synthetic polymer rayon, etc., can solve the problem of limited heat-resistant performance, unsatisfactory results, and poor viscosity of spinning solution Stability and other issues, to achieve the effect of good viscosity stability and improved heat resistance

Active Publication Date: 2011-10-19
ZHEJIANG KAIPUTE SPANDEX +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since then, many polyurethane urea elastic fiber production companies have tried to improve heat resistance by using triamines as chain extenders or additives, but the results were not satisfactory
Therefore, the triamine is only used to supplement the strength reduced by the added co-extender to improve the heat setting, while the heat resistance performance has limited effect
In addition, the use of excess triamine will inevitably make the viscosity of the spinning solution unstable

Method used

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  • Preparation method of heat resistant spandex fiber
  • Preparation method of heat resistant spandex fiber
  • Preparation method of heat resistant spandex fiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Polytetrahydrofuran PTMEG (molecular weight 1800) (82 g) and 4,4'-methylenebis(phenylisocyanate) (4,4'-MDI) (16 g) at 70 o C was reacted for 2 hours to form a prepolymer. 200 mL of DMAc solvent was added to the prepolymer to dissolve the prepolymer in the polar solvent. Add a mixture of 4,4'-diaminodiphenyl ether and ethylenediamine chain extender (10 / 90 molar ratio, 1.55 g / 0.9 g) to the prepolymer to make it react with unreacted isocyanic acid Phenyl ester and then at a temperature of 20 o C further reacted for 120 minutes until the viscosity was stable, and polymerized into polyurethane urea, the apparent viscosity at room temperature was 3200 poise. The molecular weight of the product was tested by gel permeation chromatography (GPC method), and the results are shown in Table 1.

Embodiment 2

[0037] The preparation method is the same as in Example 2, except that a mixture chain extender (15 / 85 molar ratio) of 4,4'-diaminodiphenylmethane and ethylenediamine is used. The resulting product had an apparent viscosity of 3850 poise at room temperature. The molecular weight of the product was tested by GPC, and the results are shown in Table 1.

Embodiment 3

[0039] The preparation method is the same as in Example 1, the difference is that polytetrahydrofuran (PTMEG) molecular weight 2000 is used during the prepolymerization reaction, and only p-phenylenediamine chain extender (3.4 grams) is added to the prepolymer after the prepolymerization ends, at a temperature of 70 o C react for 2 hours until the viscosity is stable. The resulting product was tested for molecular weight by GPC, and the results are shown in Table 1.

[0040] Comparative example - manufacture of conventional spandex:

[0041] The preparation method was the same as in Example 1, except that the diamine chain extender added to the prepolymer was only ethylenediamine (1.65 g), to obtain conventional spandex. Its apparent viscosity at room temperature is 4000 poise. The molecular weight was tested by GPC, and the results are shown in Table 1.

[0042] product inspection:

[0043] The molecular weight of the product prepared in the above examples was measured by...

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Abstract

The invention discloses a preparation method of heat resistant spandex fiber, belonging to the technical field of polymer textile material and preparation thereof; the preparation method comprises the following steps of: (1) mixing polyoxytetramethylene and 4,4'-methylenebis(phenyl isocyanate) according to a mole ratio of 1/1.4 to 1/2.5 for reaction to obtain a prepolymer; (2) adding non-protonicpolar solvent to the prepolymer prepared in the step (1) so that the prepolymer is dissolved in the non-protonic polar solvent to obtain prepolymer solution; (3) adding a chain extender in the prepolymer solution obtained in the step (2) to obtain spandex spinning fluid with a molecular weight of 20-300 thousands after polymerization reaction, wherein the chain extender is aromatic diamine or themixture of aromatic diamine and aliphatic diamine; (4) using the spandex spinning fluid prepared in the step (3) to obtain the heat resistant spandex fiber with a solution spinning method. Compared with conventional spandex, the product has obviously improved resistance to heat; moreover, the viscosity stability of the polymer is good.

Description

Technical field: [0001] The invention relates to a preparation method of heat-resistant spandex fiber, which belongs to the technical field of polymer textile materials and its preparation. The spandex fiber produced by the method is suitable for textile manufacture. technical background: [0002] Spandex fiber is a kind of elastic polymer containing more carbamate groups (-NH-CO-O-) in the molecular main chain, which is composed of alternating soft and hard segments - (A-B)-type Multi-block copolymers, where A is a hard segment, usually formed by the reaction of various isocyanates and small molecule chain extenders (diols or diamines), and B is usually polyether or polyester with a molecular weight of 500-3000 Polyol soft segment. The spandex formed by diamine chain extension has more excellent comprehensive performance than the product formed by diol chain extension, with higher molecular weight and more stable local ordered micro-domains, so it is currently the preferre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/78C08G18/66C08G18/48C08G18/10
Inventor 王子成徐爱军吕柏松董坚李芳李凡利赵若鹏何桂佩白刚方萍
Owner ZHEJIANG KAIPUTE SPANDEX
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