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개질 및 수첨 Bisphenol-A형 에폭시수지 중성자 차폐재 제조 및 특성
Fabrication and Characteristics of Modified and Hydrogenated Bisphenol-A type Epoxy Resin Based Neutron Shielding Materials
HWAHAK KONGHAK, October 1997, 35(5), 661-666(6), NONE
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Abstract
방사성물질의 수송 및 저장용기 등에 사용되는 개질 및 수첨 에폭시수지계 중성자 차폐재, KNS-201/202 및 KNS-301/302를 제조하였다. 기본물질은 수소함량이 높은 개질 및 수첨된 비스페놀 A형 에폭시수지이며, 첨가제로는 폴리프로필렌, 수산화알루미늄 및 탄화붕소이다. 이들 중성자 차폐재들은 경화전에 유동성이 좋아 방사성물질의 수송 및 저장용기와 같은 복잡한 구조에 사용할 수 있다. 개발된 중성자 차폐재들의 열적 및 역학적 성질, 내방사선성 및 중성자 차폐능등을평가하기 위해 여러 특성시험을 행하였다. 개발된 중성자 차폐재(수소원자수 밀도, 6.04-6.68⁓1022 atoms/㎤)들은 외국산 중성자 차폐재, NS-4-FR(수소원자수 밀도, 6.07⁓1022 atoms/㎤) 보다 수소원자수 밀도가 높아 차폐능이 우수한 것으로 나타났으며, 조사된 제반 특성들은 열분해온도; 257-264 ℃, 열전도도; 0.94-1.01 W/m·K, 열팽창계수; 1.22-1.73⁓10-6℃-1, 인장강도; 2.4-3.2 ㎏/㎟, 압축강도; 9.7-15.2 ㎏/㎟, 굴곡강도; 5.5-6.4 ㎏/㎟, 거시적 제거단면적; 0.16-0.18 ㎝-1 등을 나타냈다. 전반적으로 KNS-201/202와 KNS-301/302의 관련 특성들이 NS-4-FR보다 우수한 것으로 나타났다. 또한 KNS-301/302의 내방사선성 및 중성자 차폐능이 KNS-201/202 보다 우수한 것으로 나타났다.
New neutron shielding materials, KNS-201/202 and KNS-301/302 have been fabricated to be used for radioactive material shipping and storage cask. The base materials are a modified and a hydrogenated bisphenol-A type epoxy resin, and polypropylene, aluminium hydroxide and boron carbide are added. These shielding materials offer good fluidity at processing, which makes it possible to form this resin shield into complicated geometric shapes such as radioactive material shipping and storage cask. Several measurements were made for the shielding materials to evaluate the thermal and machanical properties, radiation resistance and neutron shielding ability. The neutron shielding ability of the shielding materials was revealed to be better than that of a foreign shielding material, NS-4-FR, due to higher hydrogen atomic density. Other properties of the shielding materials are as follows : onset temperatures 257-264℃, thermal conductivities 0.94-1.01W/m·K, thermal expansion coefficients 1.22-1.73×10-6℃-1, tensile strengths 2.4-3.2kg/mm2, compressive strengths 9.7-15.2kg/mm2, flexural strengths 5.5-6.4kg/mm2, macroscopic removal cross section 0.16-0.18cm-1. In general, the concerned properties of KNS-201/202 and KNS-301/302 were revealed to be better than those of NS-4-FR. It is also observed that the neutron shielding ability and radiation resistance of KNS-301/302 were better than those of KNS-201/202.
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