Amidoximated polyacrylonitrile spinning solution and nanoscale ion exchange fiber prepared from solution

Abstract

The invention provides an amidoximated polyacrylonitrile spinning solution and a nanoscale ion exchange fiber prepared from the solution, and belongs to the technical field of nanoscale ion exchange fiber preparation. A preparation method comprises the steps that hydroxylamine hydrochloride (or organic polyamine) and a catalyst are added into a polyacrylonitrile solution, reacting under stirring is performed for 2-5 h at the temperature of 60 DEG C-120 DEG C, the temperature is lowered to room temperature, and filtering is performed to obtain an amidoximated polyacrylonitrile solution; a crosslink inhibitor is added into the amidoximated polyacrylonitrile solution, the mixture is stirred to be uniform to obtain the amidoximated polyacrylonitrile spinning solution, the amidoximated polyacrylonitrile spinning solution is prepared into a nanofiber membrane by adopting an electrospinning technique, and the nanofiber membrane is subjected to aftertreatment to obtain the nanoscale ion exchange fiber which can be used for adsorbing harmful substances in water. The method is simple and effective, the spinning solution which is stable in viscosity and cannot generate gel is obtained, and the nanoscale ion exchange fiber which has the good adsorption capacity on heavy metal ions is prepared by taking the spinning solution as the raw material.

Description

technical field [0001] The invention belongs to the technical field of preparing nanoscale ion exchange fibers, in particular to an amidoximated polyacrylonitrile spinning solution with stable viscosity and no gel formation and nanoscale ion exchange fibers prepared by using the solution. Background technique [0002] Metal mines, non-ferrous smelting, iron and steel, electrolysis, electroplating, petrochemicals, batteries, leather, pesticides, paints, medicines, pigments, circuit boards, aviation equipment, etc. are key industries that have an important impact on the national economy. In the production of these industries A large amount of heavy metal-containing wastewater will inevitably be produced. Once it is discharged into rivers and other water bodies, whether it is directly drunk or eaten after being enriched in the food chain, many serious diseases will occur. It is of great significance to treat the wastewater from the source to meet the discharge standards. [000...

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Problems solved by technology

After the study, it was found that although the above-mentioned fiber membrane has good adsorption performance, when the polyacrylonitrile electrospun fiber membrane reacts with hydroxylamine hydrochloride, the strength of the fiber membrane decreases greatly with the increase of the amount of hydroxylamine hydrochloride introduced, and the flexibility becomes very poor. It is brittle, easily broken, and cannot be used. At the same time, in mass production, there are also problems such as cumbersome process and inconvenient operation caused by the reaction of large pieces of fiber cloth; theoretically, polyacrylonitrile and hydroxylamine hydrochloride undergo amidoximation Nanofibers can also be obtained by spinning, which can not only form a flexible fiber film, but also realize the continuous operation of acrylonitrile polymerization → amidoximation → electrospinning, avoiding the inconvenience of large fiber cloth for amidoximation reaction. It is beneficial to the batch industrial production of this type of fiber. The literature (Liu Bin, Preparation and Performance Research of Amidoximated Nanomaterials [Master's Thesis], 2015) reacts polyacrylonitrile with hydroxylamine hydrochloride to prepare amidoximated polyacrylonitrile solution , and then prepared nanofibers capable of adsorbing copper ions and lead ions by electrospinning

However, the amidoximated polyacrylonitrile solution obtained by this method has a high viscosity and is difficult to spin, and as time goes on, the viscosity gradually increases, resulting in a gradual increase in fiber diameter, and the formation of insoluble crosslinks in more than ten hours. Gel, in industrial continuous production, will inevitably block nozzles, pipelines, and cause danger. How to solve the problem of viscosity increase and gel formation in amidoximated polyacrylonitrile spinning solution is the key to its industrial application

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