Preparation method of ultra-fine fiber material for preventing neutron radiation

Abstract

The invention provides a preparation method of an ultra-fine fiber material for preventing neutron radiation. A PP section and nano B4C blend is used as a raw material of the ultra-fine fiber material, a titanate coupling agent and TAS-2A are used as additives, and PP / B4C blend is subjected to melt spinning by melt blowing. A fast neutron slowing-down material (polypropylene) and a slow neutron absorbing material (nano boron carbide) are blended, on the basis of surface modification on the nano boron carbide by the titanate coupling agent, a TAS-2A dispersant is added, therefore, the nano B4C is uniformly adhered to the surface of a carrier, after PP / B4C masterbatches are prepared, the PP / B4C masterbatches and matrix sections are blended in proportion, melt spinning is carried out by melt blowing, the nano boron carbide are uniformly dispersed into polypropylene ultra-fine fibers, the prepared ultra-fine fiber net-shaped material is soft, fluffy, light and thin and is good in breathability, and then protective garment of which the protective shielding rate to thermal neutrons can reach 80% is manufactured.

Description

technical field [0001] The invention belongs to the field of spinning, and in particular relates to a preparation method of a neutron radiation-resistant superfine fiber material. Background technique [0002] Neutron is a kind of neutral particle without charge, which can be divided into fast neutron and slow neutron. It has strong penetrating power and can travel far in the air. Studies have shown that neutrons are far harmful to the human body. Higher than X-rays and gamma rays. The essence of neutron protection is to moderate fast neutrons and absorb slow neutrons, and then shield neutrons. [0003] Boron-containing compounds are the best shielding materials for the preparation of neutron radiation protection materials. Most of the neutron protection materials at home and abroad are melt-blended high polymers containing more hydrogen and inorganic borides to make composite sheets or spun and then woven into clothing. Polypropylene (PP) and boron carbide (B 4 C) is a c...

AI Technical Summary

Problems solved by technology

Polypropylene (PP) and boron carbide (B 4 C) is a commonly used neutron protection material, boron carbide must be highly uniformly dispersed in polypropylene to avoid the perforation effect of radiation shielding, but chemically inert B 4 The compatibility of C and the non-polar compound PP is very poor, so about PP / B 4 Compatibility study of C blend system is a key issue in the development of anti-neutron radiation materials

[0004] Currently used in B 4 A coupling agent (silane coupling agent, titanate coupling agent) is added to the blend of C and PP to 4 C surface is modified to improve B 4 The infiltration and dispersion of C, but observed by electron microscope, B 4 C particle agglomeration is serious, and uniform dispersion cannot be truly achieved

Therefore, in order to improve the neutron shielding rate, only increase the B 4 C content (the maximum content of boron carbide skin-core fiber is 40%, and the added amount of the composite sheet is higher) and the thickness of the composite sheet and fabric, when used as clothing materials, the fabric will have poor softness, poor air permeability, and too heavy. Inconvenient, expensive, and there are many protection loopholes, which cannot meet the protection requirements

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