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Preparation method of spandex with durable resistance to aging

An aging-resistant and high-performance technology, used in climate sustainability, sustainable manufacturing/processing, textile/flexible product manufacturing, etc., can solve the problems of reducing molecular weight, reducing elongation, limiting the wide application of spandex, and achieving The effect of changing and improving heat resistance

Active Publication Date: 2019-09-17
ZHEJIANG HUAFENG SPANDEX
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] (2) Damp heat aging: In a high temperature and humid environment, the polyurethane polymer chain will break, reducing the molecular weight, resulting in a decrease in tensile strength and elongation
[0008] (3) Aging in chlorine water: After treatment with sodium hypochlorite, the C-C bond in the soft segment of the spandex polymer chain will be broken, and the amide bond and other groups in the hard segment will also be chlorinated, making the spandex lose its elasticity and strength, and the accelerator will age and shorten the span greatly. service life
[0009] All in all, there are many factors affecting the aging of spandex, which limit the wide application of spandex, especially the durability of the fiber is challenged

Method used

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  • Preparation method of spandex with durable resistance to aging
  • Preparation method of spandex with durable resistance to aging

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Experimental program
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Effect test

preparation example Construction

[0034] A kind of spandex with durable anti-aging performance and its preparation method described in the present invention, its preparation steps are as follows:

[0035] 1.) Preparation of prepolymer solution: Add solvent, polyether diol and hydroxyl-terminated polyolefin in sequence in the prepolymerization tank, then add mixed diisocyanate according to the molar ratio of NCO to OH of 1.50 to 2.00, and the prepolymerization reaction temperature The temperature is controlled at 40-50°C, the reaction time is 60-90 minutes, and the reaction is carried out in a nitrogen atmosphere to obtain the prepolymer stock solution;

[0036] 2.) Transfer the obtained prepolymer stock solution to the chain extension tank, add solvent to the prepolymerization tank, fully stir and dissolve, and transfer it to the chain extension tank to form a prepolymer solution;

[0037] 3.) Then, when the temperature of the prepolymer solution is lowered to 6-12°C, the amine solution is slowly added to carr...

Embodiment 1

[0051] Add 8kgDMAc and 10kgPTMG (molecular weight: 2000) into the prepolymerization tank, stir and mix evenly, when the temperature reaches about 25°C, add 2.0kgMDI, raise the temperature to 45°C, and the reaction time is 60min to obtain the prepolymerization product.

[0052] Transfer the pre-polymerization product to the chain extension tank, add 8kg DMAc to the pre-polymerization tank, add cleaning solvent, transfer to the chain extension tank, cool to 10°C, and start slowly dropwise adding the mixed extension product containing ethylenediamine and diethylamine. chain amine solution for chain extension and diethylamine for chain capping. After the reaction is completed, anti-yellowing additives, anti-ultraviolet absorbers, antioxidants, lubricants, matting agents and other additives are added, and the viscosity reaches 7000 poises to obtain a spinning polyurethaneurea solution with a final solid content of 35%. The spinning dope adopts dry spinning technology, oiled, and mo...

Embodiment 2～8

[0053] Embodiments 2 to 8 are shown in the figure below:

[0054]

[0055]

[0056] Supplementary note:

[0057] The level of yellowing resistance refers to: the sample will be yellowed after being irradiated by ultraviolet lamp for a certain period of time at a certain temperature. The color change of the sample before and after ultraviolet lamp irradiation is detected, and the color difference is calculated.

[0058] High temperature resistance performance refers to: the sample is at a certain temperature, after the silk is shaped at high temperature, it is dyed by a high-temperature dyeing machine, and the change in tensile strength before and after the silk is tested.

[0059] Chlorine resistance refers to: put the sample into a certain concentration of sodium hypochlorite solution, after a certain period of time, after taking it out, detect the change of the tensile strength before and after the wire.

[0060] Alkali resistance performance refers to: put the sample...

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Abstract

The invention relates to a preparation method of spandex with durable resistance to aging. The preparation method of the spandex comprises the following steps that 1, polyether diol and hydroxyl-terminated polyolefin are blended in a certain proportion and then react with a mixture isocyanate for a pre-polymerization reaction; 2, a prepolymer is cooled to about 6-12 DEG C, a chain extender, a cross-linking agent and a chain terminator solution are slowly added for a reaction, and a polyurethane-urea solution is formed; 3, a functional auxiliary material additive is added, and even stirring and curing are conducted; 4, by means of a dry-method spinning technology, through a spinning channel, twisting, oil agent application and formation are conducted, and the spandex with excellent aging-resistance performance is formed through spinning. The prepared spandex has excellent light stability, heat resistance, yellowing resistance and weather resistance, the damage caused in the storage and application processes of spandex fibers can be reduced, and the service life of the fabric with the spandex is prolonged.

Description

technical field [0001] The invention relates to a preparation method of spandex with durable anti-aging performance, belonging to the field of polyurethane elastic fibers. The spandex fiber prepared by the invention has excellent light stability, heat resistance, yellowing resistance, weather resistance, etc., prevents the fabric from deteriorating during storage and use, and improves the performance and service life of the spandex-containing fabric. Background technique [0002] Spandex is a multi-block copolymer with alternating soft and hard segments. It has the advantages of high breaking strength and large elastic recovery rate. It is widely used in daily fabrics and is an indispensable member of modern fabrics. [0003] Under normal circumstances, elastic fabrics containing spandex are inevitably affected by light, heat, acid and alkali, chlorine water and other substances during storage, sales, wearing, and cleaning, which will cause the performance of spandex fibers ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D01F6/72C08G18/76C08G18/75C08G18/62C08G18/48C08G18/12C08G18/32
CPCD01F6/72C08G18/6208C08G18/4854C08G18/758C08G18/7671C08G18/724C08G18/4063C08G18/12C08G18/3206Y02P70/62
Inventor 邵晓林杨晓印温作杨池晓智孔懿阳毛植森许图远王敏
Owner ZHEJIANG HUAFENG SPANDEX
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