High-strength and high-resiliency spandex fiber and preparation method thereof

A technology of spandex fiber and high resilience, applied in the field of polymer chemistry, can solve the problems of decreased storage stability of spandex stock solution, limited improvement of spandex resilience, and decreased spinning performance, so as to ensure storage stability and spinning performance. Stability, good storage stability, the effect of improving weaving properties

Pending Publication Date: 2020-07-10
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the spandex prepared by the above-mentioned patent documents all have problems such as limited improvement in rebound resilience, decline in storage stability of spandex stock solution, and decline in spinning performance to varying degrees.

Method used

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  • High-strength and high-resiliency spandex fiber and preparation method thereof
  • High-strength and high-resiliency spandex fiber and preparation method thereof
  • High-strength and high-resiliency spandex fiber and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The preparation method of the spandex fiber in this example comprises the following steps: mixing 4,4'-diphenylmethane diisocyanate and 1% 2,4'-diphenylmethane diisocyanate in a molar ratio of 99% respectively to obtain diisocyanate , according to carbodiimide-modified 4,4'-diphenylmethane diisocyanate (CD-MDI produced by Wanhua Chemical in this example) with a mass ratio of 5wt% and the above-mentioned diisocyanate with a mass ratio of 95wt%. The mixture is manufactured as a mixed isocyanate.

[0027] According to the capping ratio (CR) of 1.65, the polytetramethylene ether glycol with an average molecular weight of 1800 is mixed with the above-mentioned mixed isocyanate, mixed at 45°C for 1.5 hours, and kept for 1.5 hours when the temperature reaches 90°C. , and then cooled at 40° C. for 1.5 hours to prepare a prepolymer. A mixture of ethylenediamine and 10% 1,2-propylenediamine in a molar ratio is used as a chain extender, diethylamine is used as a chain terminator,...

Embodiment 2

[0030] The difference between the preparation method of the spandex fiber in this example and Example 1 is that the molar ratios are respectively 97% of 4,4'-diphenylmethane diisocyanate and 3% of 2,4'-diphenylmethane diisocyanate The isocyanate is mixed to obtain diisocyanate, and then the mixture obtained by carbodiimide-modified diisocyanate with a mass ratio of 5 wt% and the above-mentioned diisocyanate with a mass ratio of 95 wt% is produced as a mixed isocyanate. All the other raw materials, reaction steps and experimental conditions are the same as in Example 1.

Embodiment 3

[0032] The difference between the preparation method of the spandex fiber in this example and Example 1 is that the molar ratios are respectively 95% of 4,4'-diphenylmethane diisocyanate and 5% of 2,4'-diphenylmethane diisocyanate The isocyanate is mixed to obtain diisocyanate, and then the mixture obtained by carbodiimide-modified diisocyanate with a mass ratio of 5 wt% and the above-mentioned diisocyanate with a mass ratio of 95 wt% is produced as a mixed isocyanate. All the other raw materials, reaction steps and experimental conditions are the same as in Example 1.

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Abstract

The invention belongs to the field of polymer chemistry, and particularly relates to a high-strength and high-resiliency spandex fiber and a preparation method thereof. The preparation method includesthe following steps that a prepolymer is prepared by reacting polyhydric alcohols with isocyanate; the prepolymer and a chain extender are subjected to secondary polymerization, a chain terminator isadded to end polymerization, and accordingly a polymer dope of polyurethane urea is obtained; an annexing agent is optionally added into the polymer dope of the polyurethane urea to be evenly stirred, then spinning is conducted, and the spandex fiber is obtained; and the isocyanate refers to a mixture containing the isocyanate modified through diisocyanate and carbodiimide. The spandex fiber disclosed by the invention has the high-strength and high-resiliency properties at the same time, the strength is 1.70-2.00g/d or above, the stress at definite elongation is 10.5-13.5cN, the elongation atbreak is 520-600cN or above, the elastic recovery rate is 93%-95% or above, and the weaving performance of spandex fabrics in the high-resiliency field is greatly improved.

Description

technical field [0001] The invention belongs to the field of polymer chemistry, and in particular relates to a high-strength, high-resilience spandex fiber and a preparation method thereof. Background technique [0002] Spandex is an elastic fiber made from polyurethane block copolymer through spinning. Generally speaking, the elongation at break of spandex is 500% to 700%, and the elastic recovery rate is greater than 90%, and it is widely used in knitted and woven fabrics. In order to meet the requirements of use, some specific application fields (such as: athletes' knee pads, wrist pads, sportswear, ladies' corset straps, swimwear, etc.) require spandex fibers with higher resilience. [0003] Due to the thermodynamic incompatibility of the soft and hard segments, spandex usually exhibits a microphase-separated aggregate structure, and the greater the degree of microphase separation, the better the mechanical properties of the fiber such as fatigue resistance and resilien...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/70D01F6/94C08G18/79
CPCD01F6/70D01F6/94C08G18/797
Inventor 许钦一高振华齐旺顺张宏科
Owner WANHUA CHEM GRP CO LTD
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