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A method for producing spandex yarn by using spandex prepolymer waste liquid

A prepolymer and spandex yarn technology, applied in the field of spinning, can solve the problems of secondary environmental pollution and difficult recycling, and achieve the effect of increasing the pressure of sewage treatment and solving the effect of not being able to recycle

Active Publication Date: 2017-12-01
CHANGLE HENGSHEN SYNTHETIC FIBER
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Problems solved by technology

[0003] However, in the entire spandex production process, a large amount of prepolymer waste liquid produced in the previous prepolymerization process is relatively difficult to recycle due to the unfinished reaction. Basically, it is solidified and discarded, and the company pays for a professional environmental protection company to deal with it. Easy to produce secondary environmental pollution

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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  • A method for producing spandex yarn by using spandex prepolymer waste liquid
  • A method for producing spandex yarn by using spandex prepolymer waste liquid

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Embodiment Construction

[0023] see figure 1 and figure 2 Shown, a kind of method of utilizing spandex prepolymer waste liquid of the present invention to produce spandex yarn, described method comprises the steps:

[0024] 1. Pre-polymerization process: A professional production control program is adopted to ensure that the waste liquid discharged in the pre-polymerization process meets the molar ratio required for recycling (the molar ratio of MDI and PTMG is controlled between 1.6-1.9). Collect the recovered prepolymer waste liquid in a special container, store it in a sealed environment at 40-60 degrees, set the reaction time according to the temperature conditions, and finally prepare the prepolymer waste liquid that meets the recycling requirements for future use.

[0025] 2. Final polymerization chain extension process: First, carry out the NCO (isocyanate group) index detection of the prepolymer waste liquid by assay, confirm the process conditions of the final polymerization chain extension...

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Abstract

The invention provides a method for producing spandex filaments by utilizing a spandex prepolymer waste liquid. The method comprises the steps: 1 performing prepolymerization process; 2 performing final polymerization chain extension process; 3 adding an additive to improve use performance; 4 stirring; 5 filtering; and 6 spinning. According to the method for producing spandex filaments by utilizing the spandex prepolymer waste liquid, prepolymers which are not reacted completely can be recycled, so that secondary environment pollution is not caused, and thus the goal of recycling prepolymer and testing sampling mixed amine and additives is achieved.

Description

technical field [0001] The invention relates to the technical field of spinning, in particular to a method for producing spandex yarn by utilizing waste liquid of spandex prepolymer. Background technique [0002] In the production of spandex, waste liquid recovery is mainly carried out with the end polymer (polyurethane urea) as the object, and the raw liquid is obtained after simple stirring, mixing, storage and filtration, and is spun through dry spinning technology Forming, so as to achieve solvent recovery and produce spandex yarn. The recycling objects are mainly for the waste liquid (that is, polyurethane urea) that has been reacted in the post-production process of spandex. [0003] However, in the entire spandex production process, a large amount of prepolymer waste liquid produced in the previous prepolymerization process is relatively difficult to recycle due to the unfinished reaction. Basically, after coagulation and waste, the company pays for professional envi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F6/94D01F1/10D01D5/04C08J11/04
CPCC08J11/04D01D5/04D01F1/10D01F6/94Y02P20/143Y02W30/62
Inventor 谷德强蒋同德陈利周荣昌马闯张国敏彭宽伟蒋泽强
Owner CHANGLE HENGSHEN SYNTHETIC FIBER
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