The collection of radioactive materials in nuclear power plant environments is one of the cutting-edge topics in international environmental protection. Filtered nonwovens play an important role in this field, and they can selectively collect radioactive aerosols in the environment.
In the past 50 years, at the Russian nuclear power plant, chlorinated polyvinyl chloride electrospun nonwoven fabrics have been completed. Their ashing temperature is higher than 500 °C , and the coking residue is 22% . It does not react with radioactive materials. . Thus, the production of a filter nonwoven fabric for a nuclear power plant has a process in which the ashing temperature is lower than 500 ° C, no coking residue is formed, and no harmful substances are separated, which has become a desired goal in the industry.
The Karpova Institute of Physics and Chemical Sciences in Russia studied the use of polystyrene and polymethyl methacrylate to produce non-woven fabrics for the collection of suspended particulates in nuclear power plants. The ashing temperatures of the two polymer fibers are lower than 500 ° C, 340-370 ° C , no coking residue, experiments have shown that they have stable fiber-forming properties. In preparing the fiber solution, the solvent used for the polystyrene is cyclohexanone , and the solvent of the polymethyl methacrylate is a mixture, wherein the butyl acetate is 80% , and the N,N -dimethylformamide is 20% . These solvents give the polymer better processability. The viscosity of the polymer solution and the flow rate of the polymer solution through the capillary are closely related to the fiber diameter. In addition, they also studied the effects of conductivity and electric field strength of polymer solutions on fiber diameter and fiber properties to select the best process parameters.
At a nuclear power plant in Russia, a comparative test of filtered aerosols on polystyrene nonwovens and polymethyl methacrylate nonwovens proved that the two newly studied nonwovens improved the collection of aerosols. . (China Textile Network)
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