JPH02162295A - Neutron shielding material - Google Patents
Neutron shielding materialInfo
- Publication number
- JPH02162295A JPH02162295A JP31629288A JP31629288A JPH02162295A JP H02162295 A JPH02162295 A JP H02162295A JP 31629288 A JP31629288 A JP 31629288A JP 31629288 A JP31629288 A JP 31629288A JP H02162295 A JPH02162295 A JP H02162295A
- Authority
- JP
- Japan
- Prior art keywords
- poly
- manufactured
- parts
- weight
- olefinic resins
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000000463 material Substances 0.000 title claims abstract description 12
- 238000002156 mixing Methods 0.000 claims abstract description 4
- 150000001639 boron compounds Chemical class 0.000 claims description 9
- 229920005672 polyolefin resin Polymers 0.000 claims description 9
- 239000011358 absorbing material Substances 0.000 abstract description 24
- 239000003963 antioxidant agent Substances 0.000 abstract description 17
- 239000004700 high-density polyethylene Substances 0.000 abstract description 8
- -1 boron carbide compound Chemical class 0.000 abstract description 7
- 229920005989 resin Polymers 0.000 abstract description 7
- 239000011347 resin Substances 0.000 abstract description 7
- 239000000203 mixture Substances 0.000 abstract description 6
- 150000001875 compounds Chemical class 0.000 abstract description 5
- 229910052580 B4C Inorganic materials 0.000 abstract description 3
- 238000010521 absorption reaction Methods 0.000 abstract description 3
- 239000004702 low-density polyethylene Substances 0.000 abstract description 3
- 230000006866 deterioration Effects 0.000 abstract description 2
- 125000000816 ethylene group Chemical class [H]C([H])([*:1])C([H])([H])[*:2] 0.000 abstract 1
- 229940063583 high-density polyethylene Drugs 0.000 abstract 1
- 229940099514 low-density polyethylene Drugs 0.000 abstract 1
- 238000002844 melting Methods 0.000 abstract 1
- 230000008018 melting Effects 0.000 abstract 1
- 238000007669 thermal treatment Methods 0.000 abstract 1
- 229910052810 boron oxide Inorganic materials 0.000 description 20
- JKWMSGQKBLHBQQ-UHFFFAOYSA-N diboron trioxide Chemical compound O=BOB=O JKWMSGQKBLHBQQ-UHFFFAOYSA-N 0.000 description 20
- 241000156978 Erebia Species 0.000 description 16
- 238000012360 testing method Methods 0.000 description 15
- 230000003078 antioxidant effect Effects 0.000 description 13
- 230000000740 bleeding effect Effects 0.000 description 13
- OJMIONKXNSYLSR-UHFFFAOYSA-N phosphorous acid Chemical compound OP(O)O OJMIONKXNSYLSR-UHFFFAOYSA-N 0.000 description 10
- 238000000748 compression moulding Methods 0.000 description 9
- 239000005038 ethylene vinyl acetate Substances 0.000 description 9
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 9
- 238000010438 heat treatment Methods 0.000 description 7
- 229920001903 high density polyethylene Polymers 0.000 description 7
- 239000002530 phenolic antioxidant Substances 0.000 description 7
- 230000000052 comparative effect Effects 0.000 description 5
- 229920000092 linear low density polyethylene Polymers 0.000 description 4
- 239000004707 linear low-density polyethylene Substances 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 230000005855 radiation Effects 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- XDVOLDOITVSJGL-UHFFFAOYSA-N 3,7-dihydroxy-2,4,6,8,9-pentaoxa-1,3,5,7-tetraborabicyclo[3.3.1]nonane Chemical compound O1B(O)OB2OB(O)OB1O2 XDVOLDOITVSJGL-UHFFFAOYSA-N 0.000 description 3
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 3
- 229960002645 boric acid Drugs 0.000 description 3
- 235000010338 boric acid Nutrition 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- VGTPKLINSHNZRD-UHFFFAOYSA-N oxoborinic acid Chemical compound OB=O VGTPKLINSHNZRD-UHFFFAOYSA-N 0.000 description 3
- SSADPHQCUURWSW-UHFFFAOYSA-N 3,9-bis(2,6-ditert-butyl-4-methylphenoxy)-2,4,8,10-tetraoxa-3,9-diphosphaspiro[5.5]undecane Chemical compound CC(C)(C)C1=CC(C)=CC(C(C)(C)C)=C1OP1OCC2(COP(OC=3C(=CC(C)=CC=3C(C)(C)C)C(C)(C)C)OC2)CO1 SSADPHQCUURWSW-UHFFFAOYSA-N 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 2
- 229910052793 cadmium Inorganic materials 0.000 description 2
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 2
- 230000003750 conditioning effect Effects 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 229920001684 low density polyethylene Polymers 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N phenol group Chemical group C1(=CC=CC=C1)O ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910052582 BN Inorganic materials 0.000 description 1
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 244000245420 ail Species 0.000 description 1
- 229920000231 antioxidant polymer Polymers 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- INAHAJYZKVIDIZ-UHFFFAOYSA-N boron carbide Chemical compound B12B3B4C32B41 INAHAJYZKVIDIZ-UHFFFAOYSA-N 0.000 description 1
- ZDVYABSQRRRIOJ-UHFFFAOYSA-N boron;iron Chemical compound [Fe]#B ZDVYABSQRRRIOJ-UHFFFAOYSA-N 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 230000002542 deteriorative effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 235000004611 garlic Nutrition 0.000 description 1
- 150000002431 hydrogen Chemical class 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 150000002642 lithium compounds Chemical class 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 229920013716 polyethylene resin Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
Landscapes
- Compositions Of Macromolecular Compounds (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は成形加工性が容易で優れた外観を持ちつつ、中
性子線を吸収し、尚かつ二次放射線を発生しにくい中性
子線遮蔽材に関するものである。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a neutron beam shielding material that is easy to mold, has an excellent appearance, absorbs neutron beams, and does not easily generate secondary radiation. It is something.
［従来の技術］
近年の原子力産業の発展に伴い、原子炉、高速増殖炉等
の原子力施設及び粒子加速器、核融合炉などから発生す
る中性子線の遮蔽は安全上重要な課題となっている。そ
こで、安全且つ確実な中性子線の遮蔽方法の開発が急が
れる。[Background Art] With the recent development of the nuclear power industry, shielding of neutron beams generated from nuclear facilities such as nuclear reactors and fast breeder reactors, particle accelerators, and nuclear fusion reactors has become an important safety issue. Therefore, there is an urgent need to develop a safe and reliable method for shielding neutron beams.
従来から使用されている放射線吸収材料としては、水、
重コンクリ−１・、ポリエチレン樹脂などの水素含有化
合物及び鉛、鉄、カドミウム、ホウ素、リチウムなどの
金属がある。この金属の中でも安価なため一般に使用さ
れてきた鉛、カドミウム等は中性子線に暴露されると強
い二次放射線を発生するため安全性の問題が指摘されて
いる。Conventionally used radiation absorbing materials include water,
These include heavy concrete, hydrogen-containing compounds such as polyethylene resin, and metals such as lead, iron, cadmium, boron, and lithium. Among these metals, lead, cadmium, etc., which are commonly used because they are cheap, have been pointed out to be a safety problem because they generate strong secondary radiation when exposed to neutron beams.
このため二次放射線の発生が少なく安価で且つ成形加工
性が良好な中性子線吸収材料として無機ホウ素化合物や
無機リチウム化合物等が用いられている。これらの化合
物はポリオレフィン系樹脂等の樹脂に配合混練して用い
る場合が多いが、特に無機ホウ素化合物は吸湿性及び潮
解性を有しており成型品とした際、表面の劣化即ち中性
子線吸収材料のブリードが生じ中性子線吸収遮蔽能力を
低下させるという問題があった。特に中性子線吸収材料
の中でも酸化ホウ素等は人体に有害な物質であり、取扱
い及び施工状態にもよるが、これらの物質のブリードは
安全性及び衛生面からも問題が指摘されていた。For this reason, inorganic boron compounds, inorganic lithium compounds, and the like are used as neutron beam absorbing materials that generate less secondary radiation, are inexpensive, and have good moldability. These compounds are often mixed and kneaded with resins such as polyolefin resins, but inorganic boron compounds in particular have hygroscopic and deliquescent properties, so when molded products are made, surface deterioration or neutron beam absorbing materials may occur. There was a problem in that bleeding occurred and the neutron beam absorption and shielding ability was reduced. In particular, among neutron beam absorbing materials, boron oxide and the like are harmful to the human body, and bleeding of these substances has been pointed out to be a problem from a safety and hygiene perspective, depending on handling and construction conditions.
［発明が解決しようとする課題］
本発明は材料の特性を低下させることなく、加工性に優
れ、従来発生していた無機ホウ素化合物の吸湿性乃至潮
解性を改良した中性子線吸収遮蔽材を提供することを目
的とする。[Problems to be Solved by the Invention] The present invention provides a neutron beam absorbing shielding material that has excellent workability without deteriorating the material properties and has improved hygroscopicity and deliquescent properties of conventionally generated inorganic boron compounds. The purpose is to
［課題を解決するための手段］
上記のような現状に鑑み、本発明者らは鋭意検討を重ね
た結果、無機ホウ素化合物を熱処理することにより成型
品表面のブリードを改良できることを見出し発明を完成
するに至った。[Means for Solving the Problems] In view of the above-mentioned current situation, the inventors of the present invention have conducted extensive studies and have completed the invention by discovering that bleeding on the surface of a molded product can be improved by heat treating an inorganic boron compound. I ended up doing it.
即ち本発明はポリオレフィン系樹脂に無機ホウ素化合物
を混合してなる中性子線遮蔽材において、中性子線吸収
材料が予め熱処理されていることを特徴とする中性子線
遮蔽材に関する。That is, the present invention relates to a neutron beam shielding material made of a polyolefin resin mixed with an inorganic boron compound, wherein the neutron beam absorbing material is heat-treated in advance.
以下本発明の詳細な説明する。The present invention will be explained in detail below.
本発明でいう、無機ホウ素化合物としては例えば炭化ホ
ウ素、窒化ホウ素、ホウ素鉄、灰ホウ石、正ホウ酸、メ
タホウ酸、四ホウ酸、酸化ホウ素等を挙げる事ができる
。これらの中性子線吸収材料の中で吸湿性乃至潮解性物
質として例えば正ホウ酸、メタホウ酸、四ホウ酸、酸化
ホウ素等は加熱コンディショニングすることで水分を除
去して用いることが好ましい。特に酸化ホウ素は吸湿に
より四ホウ酸、メタホウ酸、正ホウ酸に変化し著しい潮
解性を示す。特に上記加熱コンディショニングは各物質
の最適な脱水条件にて乾燥する必要がある。即ち物質中
に取り込まれた水分が脱離する温度でも必ずしもブリー
ドの抑制に効果がある訳ではない。酸化ホウ素の熱処理
条件は１４０℃以上が好ましい。即ち１００〜１４０℃
未満での加熱ではブリードの抑制の効果は望めない。又
、熱処理時間は通常の加熱乾燥装置では、１〜４時間程
度が好ましく、それ以上の時間の処理を行っても、更な
る効果の向上はない。Examples of the inorganic boron compound used in the present invention include boron carbide, boron nitride, iron boron, perovskite, orthoboric acid, metaboric acid, tetraboric acid, boron oxide, and the like. Among these neutron beam absorbing materials, hygroscopic or deliquescent substances such as orthoboric acid, metaboric acid, tetraboric acid, boron oxide, etc. are preferably used after removing moisture by heat conditioning. In particular, boron oxide changes into tetraboric acid, metaboric acid, and orthoboric acid upon absorption of moisture, and exhibits remarkable deliquescent properties. In particular, the heating conditioning described above requires drying under optimal dehydration conditions for each substance. That is, even at a temperature at which water taken into a substance is desorbed, it is not necessarily effective in suppressing bleeding. The heat treatment conditions for boron oxide are preferably 140° C. or higher. i.e. 100-140℃
Heating at a temperature lower than that cannot be expected to be effective in suppressing bleeding. Further, the heat treatment time is preferably about 1 to 4 hours using a normal heating drying device, and even if the treatment is performed for a longer time, the effect will not be further improved.
無機ホウ素化合物の配合量は、使用する材料によって異
なるが、ポリオレフィン系樹脂１００重量部に対して１
〜５０Ｏｆｆｌｆｍ部である。例えば、酸化ホウ素では
１〜８０重量部が好ましい。The blending amount of the inorganic boron compound varies depending on the material used, but it is 1 part by weight per 100 parts by weight of the polyolefin resin.
~50 Offlfm portions. For example, for boron oxide, 1 to 80 parts by weight is preferable.
本発明でいうポリオレフィン系樹脂とは高密度ポリエチ
レン、低密度ポリエチレン、直鎖状低密度ポリエチレン
等のポリエチレン、エチレン−酢酸ビニル共重合体、ポ
リプロピレン等のことであり、これらを単独あるいは二
種以上混合して用いる。特に水素の量が多い程中性子の
遮蔽効果が向上するため、高密度ポリエチレン又は低密
度ポリエチレンを使用することが好ましい。その際、成
形加工性を改良するためエチレン−酢酸ビニル共重合体
等を加える場合には、その配合割合は、水素の含有量と
耐熱性の関係からポリオレフィン系樹脂の全重量に対し
、５０ｆｆ１ｍ部以下に押さえることが好ましい。In the present invention, the polyolefin resin refers to polyethylene such as high-density polyethylene, low-density polyethylene, and linear low-density polyethylene, ethylene-vinyl acetate copolymer, polypropylene, etc., and these may be used alone or in combination of two or more. and use it. In particular, it is preferable to use high-density polyethylene or low-density polyethylene because the greater the amount of hydrogen, the better the neutron shielding effect. At that time, when adding ethylene-vinyl acetate copolymer, etc. to improve moldability, the mixing ratio should be 50 ff 1 m part based on the total weight of the polyolefin resin due to the relationship between hydrogen content and heat resistance. It is preferable to keep it below.
又、ポリオレフィン系樹脂の酸化防止の為に通常用いら
れる酸化防止剤としてフェノール系及びホスファイト系
添加剤を用いることが望ましい。Furthermore, it is desirable to use phenolic and phosphite additives as antioxidants that are commonly used to prevent oxidation of polyolefin resins.
本発明の中性子線遮蔽材を製造する方法の一例を以下に
示す。予め中性子線吸収材料はオーブン等で熱処理を行
う。また中性子線吸収材料を、酸化防止剤、ポリオレフ
ィン系樹脂と共に、そのまま、押出機を用いて直接溶融
混練すると、中性子線吸収材料と酸化防止剤が均一に分
散した混合物を得ることが難しい。この為、予め中性子
線吸収材料と酸化防止剤とをポリオレフィン系樹脂と共
にリボンブレンダー或いはヘンシェルミキサー等のトラ
イブレンド装置を用いて予め分散させた後、押出機又は
バンバリーミキサ−等の溶畿混練装置で一度ペレット化
する。このようにして得た中性子線遮蔽材料ペレットは
圧縮成型機、射出成型機、押出成型機等の装置を用いて
所望の形状のものを得る事ができる。An example of a method for manufacturing the neutron beam shielding material of the present invention is shown below. The neutron beam absorbing material is heat-treated in advance in an oven or the like. Furthermore, when a neutron beam absorbing material is directly melt-kneaded together with an antioxidant and a polyolefin resin using an extruder, it is difficult to obtain a mixture in which the neutron beam absorbing material and the antioxidant are uniformly dispersed. For this purpose, the neutron beam absorbing material and the antioxidant are predispersed together with the polyolefin resin using a tri-blend device such as a ribbon blender or Henschel mixer, and then a melt kneading device such as an extruder or Banbury mixer is used to disperse the neutron beam absorbing material and the antioxidant. Pelletize once. The neutron beam shielding material pellets thus obtained can be shaped into a desired shape using a compression molding machine, an injection molding machine, an extrusion molding machine, or the like.
［実施例］
以下実施例によって本発明を更に詳細に説明するが本発
明はこれらに限定されるものではない。[Examples] The present invention will be explained in more detail with reference to Examples below, but the present invention is not limited thereto.
実施例１
直鎖状低密度ポリエチレン（東ソー（株）製、商品名「
ニボロンーＬＪ 、Ｍ−５０）６０重量部とエチレン−
酢酸ビニル共重合体（東ソー（株）製、商品名「ウルト
ラセンＪ 、ＥＶＡ−９２１０）４０重量部と中性子線
吸収材として酸化ホウ素（日本電工（株）製）８０重量
部とホスファイト系酸化防止剤（アデカ・アーガス化学
（株）製、ＡＯ−１８）０．２８重量部とフェノール系
酸化防止剤（アデカ・アーガス化学（株）製、ＰＥＰ−
３６）０．２８重量部とを用いた。酸化ホウ素は予め１
４０℃〜１５０℃のギヤオーブン中で４時間熱処理を施
した。この酸化ホウ素と、フェノール系酸化防止剤とホ
スファイト系酸化防止剤とエチレン−酢酸ビニル共重合
体とを１１０℃のオーブンロール中にて予備混練した後
ポリエチレンを添加して１４０℃〜１５０℃のオーブン
ロール中にて５分間混練し、シート状成形体を得た。こ
こで得たシート状成形体を１９０℃で圧縮成型機により
成型した。この成型品を室温にて空気中に３ケ月間放置
し、ブリードが生じるかどうか経時的な変化を試験した
（耐久性試験）結果、殆ど変化しないことを確認した。Example 1 Linear low-density polyethylene (manufactured by Tosoh Corporation, trade name:
Nibolon-LJ, M-50) 60 parts by weight and ethylene-
40 parts by weight of vinyl acetate copolymer (manufactured by Tosoh Corporation, trade name: "Ultracene J, EVA-9210"), 80 parts by weight of boron oxide (manufactured by Nippon Denko Corporation) as a neutron beam absorbing material, and phosphite-based oxide. 0.28 parts by weight of inhibitor (AO-18, manufactured by Adeka Argus Chemical Co., Ltd.) and phenolic antioxidant (manufactured by Adeka Argus Chemical Co., Ltd., PEP-
36) 0.28 parts by weight was used. Boron oxide is 1 in advance
Heat treatment was performed for 4 hours in a gear oven at 40°C to 150°C. This boron oxide, phenolic antioxidant, phosphite antioxidant, and ethylene-vinyl acetate copolymer were pre-kneaded in an oven roll at 110°C, then polyethylene was added and the mixture was heated at 140°C to 150°C. The mixture was kneaded in an oven roll for 5 minutes to obtain a sheet-like molded product. The sheet-like molded product obtained here was molded at 190° C. using a compression molding machine. This molded product was left in the air at room temperature for 3 months and tested for changes over time to see if bleeding occurred (durability test). As a result, it was confirmed that there was almost no change.
実施例２
高密度ポリエチレン（東ソー（株）製、商品名「ニボロ
ンーハードＪ 、５６００）６０ｔＪ量部とエチレン−
酢酸ビニル共重合体（東ソー（株）製、商品名「ウルト
ラセン」、ＥｖＡ−９２１０）４０重量部と中性子線吸
収材として酸化ホウ素（８本電工（株）製）８０ｆｆｌ
量部とホスファイト系酸化防止剤（アデカ・アーガス化
学（株）製、ＡＯ−１８）０．２８ｆｆｌｆ量部とフェ
ノール系酸化防止剤（アデカ・アーガス化学（株）製、
ＰＥＰ−３６）０．２８重量部とを用いた。実施例１と
同様の加工を行った後、シート状成形体を圧縮成型機に
より成型し耐久性試験に用いた。実施例１と同様の耐久
性試験の結果殆ど変化しなかった。Example 2 60 tJ parts of high-density polyethylene (manufactured by Tosoh Corporation, trade name "Niboron-Hard J, 5600") and ethylene-
40 parts by weight of vinyl acetate copolymer (manufactured by Tosoh Corporation, trade name "Ultrasen", EvA-9210) and 80 ffl of boron oxide (manufactured by 8hon Denko Corporation) as a neutron beam absorbing material.
0.28fflf parts of phosphite antioxidant (AO-18, manufactured by Adeka Argus Chemical Co., Ltd.) and 0.28 fflf part of phenolic antioxidant (manufactured by Adeka Argus Chemical Co., Ltd.,
PEP-36) 0.28 parts by weight was used. After performing the same processing as in Example 1, a sheet-like molded body was molded using a compression molding machine and used for a durability test. As a result of the same durability test as in Example 1, there was almost no change.
実施例３
高密度ポリエチレン（東ソー（株）製、商品名「ニボロ
ンーハードＪ 、４０１０）６０重量部とエチレン−酢
酸ビニル共重合体（東ソー（株）製、商品名「ウルトラ
セン」、ＥｖＡ−９２１０）４０重量部と中性子線吸収
材として酸化ホウ素（［１本電工（株）製）８０ｆｆｆ
ｆｉｉ部とホスファイト系酸化防止剤（アデカ・アーガ
ス化学（株）製、ＡＯ−１８）０．２８重量部とフェノ
ール系酸化防止剤（アデカ・アーガス化学（株）製、Ｐ
ＥＰ−３６）ｒ）、２８重量部とを用いた。実施例１と
同様の加工を行った後、シート状成形体を圧縮成型機に
より成型し耐久性試験に用いた。実施例１と同様の耐久
性試験の結果殆ど変化しなかった。Example 3 60 parts by weight of high-density polyethylene (manufactured by Tosoh Corporation, trade name "Niboron-Hard J", 4010) and ethylene-vinyl acetate copolymer (manufactured by Tosoh Corporation, trade name "Ultracene", EvA-9210) 40 parts by weight and 80 fff of boron oxide (manufactured by Ippon Denko Co., Ltd.) as a neutron beam absorbing material.
fii part, 0.28 parts by weight of phosphite antioxidant (AO-18, manufactured by Adeka Argus Chemical Co., Ltd.), and 0.28 part by weight of phenolic antioxidant (manufactured by Adeka Argus Chemical Co., Ltd., P
EP-36)r), 28 parts by weight was used. After performing the same processing as in Example 1, a sheet-like molded body was molded using a compression molding machine and used for a durability test. As a result of the same durability test as in Example 1, there was almost no change.
実施例４
高密度ポリエチレン（東ソー（株）製、商品名「ニポロ
ンーハードＪ 、２３００）６０重量部とエチレン−酢
酸ビニル共重合体（東ソー（株）製、商品名「ウルトラ
セン」、ＥｖＡ−９２１０）４０重量部と中性子線吸収
材として酸化ホウ素（日本電工（株）製）８０７１１０
部とホスファイト系酸化防！に剤（アデカ・アーガス化
学（株）製、ＡＯ−１８）０．２８重量部とフェノール
系酸化防止剤（アデカ・アーガス化学（株）製、ＰＥＰ
−３６）０．２８重量部とを用いた。実施例１と同様の
加工を行った後、シート状成形体を圧縮成型機により成
型し耐久性試験に用いた。実施例１と同様の耐久性試験
の結果殆ど変化しなかった。Example 4 60 parts by weight of high-density polyethylene (manufactured by Tosoh Corporation, trade name "Nipolon Hard J, 2300") and ethylene-vinyl acetate copolymer (manufactured by Tosoh Corporation, trade name "Ultrasen", EvA-9210) 40 parts by weight and boron oxide (manufactured by Nippon Denko Corporation) 807110 as a neutron beam absorbing material.
Part and phosphite-based oxidation protection! 0.28 parts by weight of garlic agent (AO-18, manufactured by Adeka Argus Chemical Co., Ltd.) and phenolic antioxidant (manufactured by Adeka Argus Chemical Co., Ltd., PEP)
-36) 0.28 parts by weight was used. After performing the same processing as in Example 1, a sheet-like molded body was molded using a compression molding machine and used for a durability test. As a result of the same durability test as in Example 1, there was almost no change.
比較例１
直鎖低密度ポリエチレン（東ソー（株）製、商品名「ニ
ボロンーＬＪ 、Ｍ−５０）６０重量部とエチレン−酢
酸ビニル共重合体（東ソー（株）製、商品名ｒ’フル）
う（’ンＪ 、ＥＶＡ−９２１０）４０重量部と中性子
線吸収材として酸化ホウ素（８本電工（株）製）８０重
量部とホスファイト系酸化防止剤（アデカ・アーガス化
学（株）製、ＡＯ−１８）０．２８重量部とフェノール
系酸化防止剤（アデカ・アーガス化学（株）製、ＰＥＰ
−３６）０．２８重量部とを用いた。酸化ホウ素は予め
１２０℃のギヤオーブン中で４時間熱処理を施したこと
を除いて実施例１と同様の加工を行った後圧縮成型機に
より成型したものは耐久性試験に用いた。実施例１と同
様の耐久性試験の結果成形直後の成形品表面状態は若干
ブリードする程度だが３ケ月放置後では顕著なブリード
を確認した。Comparative Example 1 60 parts by weight of linear low-density polyethylene (manufactured by Tosoh Corporation, trade name "Niboron-LJ, M-50") and ethylene-vinyl acetate copolymer (manufactured by Tosoh Corporation, trade name "r'Full")
40 parts by weight of U ('N J, EVA-9210), 80 parts by weight of boron oxide (manufactured by Yasuhon Denko Co., Ltd.) as a neutron beam absorbing material, and a phosphite-based antioxidant (manufactured by Adeka Argus Chemical Co., Ltd.). AO-18) 0.28 parts by weight and phenolic antioxidant (manufactured by Adeka Argus Chemical Co., Ltd., PEP
-36) 0.28 parts by weight was used. The boron oxide was processed in the same manner as in Example 1 except that it was previously heat treated in a gear oven at 120° C. for 4 hours, and then molded using a compression molding machine and used for the durability test. As a result of a durability test similar to that in Example 1, the surface condition of the molded product immediately after molding showed slight bleeding, but significant bleeding was confirmed after being left for three months.
比較例２
直鎖低密度ポリエチレン（東ソー（株）製、商品名「ニ
ボロンーＬＪ 、Ｍ−５０）６０ｆｆｌ量部とエチレン
−酢酸ビニル共重合体（東ソー（株）製、商品名「ウル
トラセン」、ＥｖＡ−９２１０）４０重量部と中性子線
吸収材として酸化ホウ素（日本電工（株）製）８０重量
部とホスファイト系酸化防止剤（アデカ・アーガス化学
（株）製、Ａｏ １８）０．２８′ｍＥｉ１ｇと７エ
／ −ル系酸化防止剤（アデカ・アーガス化学（株）製
、ＰＥＰ−３６）０．２８重量部とを用いた。酸化ホウ
素の熱処理をしなかったことを除いて実施例１と同様の
加工を行った後、シート状成形体を圧縮成型機により成
型し耐久性試験に用いた。実施例１と同様の耐久性試験
の結果、成型直後の状態で既に成形品表面はブリードに
よるザラツキが生じていた。又、３ケ月後の表面状態は
著しいブリードが確認された。Comparative Example 2 60 ffl parts of linear low-density polyethylene (manufactured by Tosoh Corporation, trade name "Niboron-LJ, M-50") and ethylene-vinyl acetate copolymer (manufactured by Tosoh Corporation, trade name "Ultracene", EvA-9210) 40 parts by weight, 80 parts by weight of boron oxide (manufactured by Nippon Denko Co., Ltd.) as a neutron beam absorbing material, and 0.28' phosphite-based antioxidant (manufactured by Adeka Argus Chemical Co., Ltd., Ao 18). 1 g of mEi and 0.28 parts by weight of a 7-el antioxidant (manufactured by Adeka Argus Chemical Co., Ltd., PEP-36) were used. After performing the same processing as in Example 1 except that the boron oxide heat treatment was not performed, a sheet-like molded product was molded using a compression molding machine and used for a durability test. As a result of the same durability test as in Example 1, the surface of the molded product was already rough due to bleeding immediately after molding. In addition, significant bleeding was confirmed on the surface after 3 months.
比較例３
高密度ポリエチレン（東ソー（株）製、商品名「ニボロ
ンーハードＪ 、５６００）６０重量部とエチレン−酢
酸ビニル共重合体（東ソー（株）製、商品名［ウルトラ
センＪ 、ＥＶＡ−９２１０）４０重量部と中性子線吸
収材として酸化ホウ素（１１１本電工（株）製）８０重
量部とホスファイト系酸化防止剤（アデカ・アーガス化
学（株）製、ＡＯ−１８）０．２８重量部とフェノール
系酸化防止剤（アデカ・アーガス化学（株）製、ＰＥＰ
−３６）０．２８ｆｆｌ量部とを用いた。酸化ホウ素は
予め１２０℃のギヤオーブン中で４時間熱処理を施した
ことを除いて実施例１と同様の加工を行った後、シート
状成形体を圧縮成型機により成型し耐久性試験に用いた
。実施例１と同様の耐久性試験の結果顕著なブリードを
確認した。Comparative Example 3 60 parts by weight of high-density polyethylene (manufactured by Tosoh Corporation, trade name "Niboron-Hard J, 5600") and ethylene-vinyl acetate copolymer (manufactured by Tosoh Corporation, trade name "Ultracene J, EVA-9210") 40 parts by weight, 80 parts by weight of boron oxide (manufactured by 111 Hondenko Co., Ltd.) as a neutron beam absorbing material, and 0.28 parts by weight of a phosphite-based antioxidant (AO-18, manufactured by Adeka Argus Chemical Co., Ltd.). Phenolic antioxidant (manufactured by Adeka Argus Chemical Co., Ltd., PEP
-36) 0.28ffl parts were used. Boron oxide was processed in the same manner as in Example 1, except that it was heat-treated in a gear oven at 120°C for 4 hours, and then a sheet-shaped molded product was molded using a compression molding machine and used for a durability test. . As a result of the same durability test as in Example 1, significant bleeding was confirmed.
比較例４
高密度ポリエチレン（東ソー（株）製、商品名［ニボロ
ンーハードＪ 、５６００）６０重量部とエチレン−酢
酸ビニル共重合体（東ソー（株）製、商品名「ウルトラ
セン」、ＥｖＡ−９２１０）４０重量部と中性子線吸収
材として酸化ホウ素（日本電工（株）製）８０ｆｆｆ量
部とホスファイト系酸化防止剤（アデカ・アーガス化学
（株）製、ＡＯ−１８）０．２８重量部とフェノール系
酸化防止剤（アデカ・アーガス化学（株）製、ＰＥＰ−
３６）０．２８重量部とを用いた。酸化ホウ素は熱処理
をしなかったことを除いて実施例１と同様の加工を行っ
た後、シート状成形体を圧縮成型機により成型し耐久性
試験に用いた。実施例１と同様の耐久性試験の結果、成
型直後の状態で既に成形品表面はブリードによるザラツ
キが生じていた。又、３ケ月後の表面状態は著しいブリ
ードが確認された。Comparative Example 4 60 parts by weight of high-density polyethylene (manufactured by Tosoh Corporation, trade name [Niboron-Hard J, 5600) and ethylene-vinyl acetate copolymer (manufactured by Tosoh Corporation, trade name "Ultracene", EvA-9210) 40 parts by weight, 80 parts by weight of boron oxide (manufactured by Nippon Denko Corporation) as a neutron beam absorbing material, 0.28 parts by weight of a phosphite antioxidant (AO-18, manufactured by Adeka Argus Chemical Co., Ltd.), and phenol. Antioxidant (manufactured by Adeka Argus Chemical Co., Ltd., PEP-
36) 0.28 parts by weight was used. The boron oxide was processed in the same manner as in Example 1 except that it was not heat-treated, and then a sheet-like molded product was molded using a compression molding machine and used for a durability test. As a result of the same durability test as in Example 1, the surface of the molded product was already rough due to bleeding immediately after molding. In addition, significant bleeding was confirmed on the surface after 3 months.
［発明の効果］
本発明の方、法によれば、比較例に示す従来法で問題で
あった耐久性が改良できる。[Effects of the Invention] According to the method of the present invention, the durability, which was a problem with the conventional method shown in the comparative example, can be improved.
Claims (1)
てなる中性子線遮蔽材において、無機ホウ素化合物が予
め熱処理されていることを特徴とする中性子線遮蔽材。1) A neutron beam shielding material made by mixing an inorganic boron compound with a polyolefin resin, wherein the inorganic boron compound is heat-treated in advance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31629288A JPH02162295A (en) | 1988-12-16 | 1988-12-16 | Neutron shielding material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31629288A JPH02162295A (en) | 1988-12-16 | 1988-12-16 | Neutron shielding material |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02162295A true JPH02162295A (en) | 1990-06-21 |
Family
ID=18075487
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP31629288A Pending JPH02162295A (en) | 1988-12-16 | 1988-12-16 | Neutron shielding material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02162295A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102867557A (en) * | 2012-10-09 | 2013-01-09 | 哈尔滨工业大学 | Boron nitride-polyethylene space radiation protection composite material and preparation method of composite material |
| US8664630B1 (en) * | 2011-03-22 | 2014-03-04 | Jefferson Science Associates, Llc | Thermal neutron shield and method of manufacture |
| CN107880362A (en) * | 2017-12-07 | 2018-04-06 | 四川义结科技有限责任公司 | A kind of preparation method of neutron irradiation shielding composite |
-
1988
- 1988-12-16 JP JP31629288A patent/JPH02162295A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8664630B1 (en) * | 2011-03-22 | 2014-03-04 | Jefferson Science Associates, Llc | Thermal neutron shield and method of manufacture |
| CN102867557A (en) * | 2012-10-09 | 2013-01-09 | 哈尔滨工业大学 | Boron nitride-polyethylene space radiation protection composite material and preparation method of composite material |
| CN102867557B (en) * | 2012-10-09 | 2015-08-05 | 哈尔滨工业大学 | A kind of preparation method of boron nitride-polyethylenespace space radiation protection compound substance |
| CN107880362A (en) * | 2017-12-07 | 2018-04-06 | 四川义结科技有限责任公司 | A kind of preparation method of neutron irradiation shielding composite |
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