JP2003321614A - Plastically deformable radiation-shielding resin composition - Google Patents
Plastically deformable radiation-shielding resin compositionInfo
- Publication number
- JP2003321614A JP2003321614A JP2002127805A JP2002127805A JP2003321614A JP 2003321614 A JP2003321614 A JP 2003321614A JP 2002127805 A JP2002127805 A JP 2002127805A JP 2002127805 A JP2002127805 A JP 2002127805A JP 2003321614 A JP2003321614 A JP 2003321614A
- Authority
- JP
- Japan
- Prior art keywords
- resin
- radiation
- tungsten powder
- resin composition
- plastically deformable
- 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
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- Compositions Of Macromolecular Compounds (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、放射線医療機器、
放射線発生装置、放射線格納容器、原子力施設等におい
て、放射線遮蔽体の間隙部から漏洩する放射線を遮蔽す
る目的やＸ線写真撮影時の表示マーカーとして用いるこ
とが出来る、塑性変形可能な放射線遮蔽用樹脂に関する
ものである。TECHNICAL FIELD The present invention relates to a radiation medical device,
Plastic deformable radiation shielding resin that can be used in radiation generators, radiation storage containers, nuclear facilities, etc. to shield radiation leaking from the gap of the radiation shield and as a display marker during X-ray photography. It is about.
【０００２】[0002]
【従来の技術】従来、放射線医療機器、放射線発生装
置、放射線格納容器、原子力施設等において、放射線遮
蔽体の間隙部から漏洩する放射線を遮蔽する目的におい
ては、主に塑性変形可能な金属である鉛もしくは鉛合金
が用いられてきた。また、Ｘ線写真撮影時の表示マーカ
ーとしては、鉛もしくは鉛合金を事前に文字や数字の形
に賦形した物や鉛もしくは鉛合金からなるシート状材や
棒材をその場で切断や変形させて用いていた。2. Description of the Related Art Conventionally, in a radiation medical device, a radiation generator, a radiation storage container, a nuclear facility, etc., a plastically deformable metal is mainly used for the purpose of shielding the radiation leaking from the gap of the radiation shield. Lead or lead alloys have been used. In addition, as a display marker during X-ray photography, a lead or lead alloy is preliminarily shaped in the shape of letters or numbers, or a sheet or bar made of lead or lead alloy is cut or deformed on the spot. I was using it.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、近年、
鉛害による環境破壊の問題や鉛の人体への影響が懸念さ
れ非鉛への動きが急速に高まりつつある。非鉛系材料を
用いた放射線遮蔽材料としては、タングステンやタング
ステン合金を焼結により賦形して用いる物や、タングス
テン粉末や硫酸バリウム粉末等をナイロン樹脂などの熱
可塑性樹脂と複合化させ射出成形法や押出し成形法によ
り賦形して用いたり、同じくタングステン粉末や硫酸バ
リウム粉末等をエポキシ樹脂などの熱硬化性樹脂と複合
化させ注型加熱法やトランスファ成形法により賦形され
ている。However, in recent years,
Due to concerns about environmental damage due to lead damage and the effects of lead on the human body, the movement toward lead-free is increasing rapidly. Radiation-shielding materials that use lead-free materials include tungsten and tungsten alloys that are shaped by sintering, and tungsten powder and barium sulfate powder that are compounded with thermoplastic resins such as nylon resin and injection molded. Or shaped by a extrusion molding method, or similarly shaped by a casting heating method or a transfer molding method in which tungsten powder, barium sulfate powder or the like is compounded with a thermosetting resin such as an epoxy resin.
【０００４】しかし、これらの賦形方法においては、使
用場所、用途、形状などに合わせて事前に金型を準備
し、各種成形方法により賦形することが必要であり、使
用する現場において必要とする形状を得ることは不可能
であった。本発明の目的は、上記の従来の技術の問題点
を解消し、鉛系材料を使用せず、かつ使用するその場に
おいて必要とする形状を得る為の塑性変形可能な放射線
遮蔽材料を提供することを目的とする。However, in these shaping methods, it is necessary to prepare a mold in advance according to the place of use, application, shape, etc., and perform shaping by various molding methods. It was impossible to obtain a shape that does. An object of the present invention is to solve the above-mentioned problems of the conventional techniques and to provide a plastically deformable radiation shielding material for obtaining a shape required without using a lead-based material and in situ. The purpose is to
【０００５】[0005]
【課題を解決するための手段】本発明は、ベース樹脂と
タングステン粉末からなる樹脂塑性物であって、ベース
樹脂の１００℃における動粘度が５００〜３０００００
ｃＳｔであり、タングステン粉末の比率が９７〜８０重
量％である放射線遮蔽性材料を得るものである。The present invention is a resin plastic material comprising a base resin and a tungsten powder, the kinematic viscosity of the base resin at 100 ° C. being 500 to 300,000.
A radiation shielding material having a cSt and a tungsten powder ratio of 97 to 80% by weight is obtained.
【０００６】[0006]
【発明の実施の形態】タングステン粉末をナイロン樹脂
に代表される熱可塑性樹脂やエポキシ樹脂に代表される
熱硬化性樹脂と複合化させ放射線遮蔽材料として用いる
ことは、既に行われている。しかし、熱可塑性樹脂を用
いる場合の成形方法としては射出成形や押出し成形を行
う為に射出成形機や押出し成形機が必要であり、また、
熱硬化性樹脂においてもトランスファー成形機や熱硬化
炉と言った機器が必要である。それゆえに使用する現場
での成形加工は不可能であった。BEST MODE FOR CARRYING OUT THE INVENTION It has already been practiced to compound tungsten powder with a thermoplastic resin typified by nylon resin or a thermosetting resin typified by epoxy resin to be used as a radiation shielding material. However, as a molding method when a thermoplastic resin is used, an injection molding machine or an extrusion molding machine is required to perform injection molding or extrusion molding.
Even for thermosetting resins, equipment such as transfer molding machines and thermosetting furnaces are required. Therefore, it was not possible to perform on-site molding.
【０００７】本発明に使用するベース樹脂とは、常温で
粘稠を示す不乾燥性の樹脂を指し、具体的には長鎖炭化
水素樹脂、石油ワックス、鉱油、シリコン樹脂等が挙げ
られる。その中でも化学的に安定でかつ他のものへの移
染性のない長鎖炭化水素樹脂が良い。The base resin used in the present invention refers to a non-drying resin which is viscous at room temperature, and specific examples thereof include long-chain hydrocarbon resin, petroleum wax, mineral oil and silicone resin. Among them, a long-chain hydrocarbon resin that is chemically stable and does not transfer to another is preferable.
【０００８】また、使用するベース樹脂のＪＩＳ Ｋ２
２８３法による１００℃における動粘度が５００〜３０
００００ｃＳｔであることが好ましく、動粘度が３００
０〜１００００ｃＳｔであることがより好ましい。動粘
度が５００ｃＳｔ未満の場合には、タングステン粉末と
の複合化は出来てもその自重により変形が生じる。ま
た、動粘度が３０００００ｃＳｔを超える場合には、タ
ングステン粉末との複合化が難しく、具体的にはタング
ステン粉末の鬆（す）を生じたり、変形させようとして
もちぎれてしまい塑性変形出来ない。The base resin used is JIS K2.
Kinematic viscosity at 100 ° C. according to 283 method is 500 to 30
It is preferably 0000 cSt and has a kinematic viscosity of 300.
It is more preferably 0 to 10000 cSt. When the kinematic viscosity is less than 500 cSt, the tungsten powder is deformed due to its own weight even if it can be composited. Further, if the kinematic viscosity exceeds 300,000 cSt, it is difficult to form a composite with the tungsten powder, and specifically, voids of the tungsten powder are generated, or even if an attempt is made to deform the tungsten powder, it will be torn and cannot be plastically deformed.
【０００９】長鎖炭化水素樹脂の中でもイソブテンの重
合体であるポリイソブテン樹脂やノルマルブテンの重合
体であるのポリブテン樹脂のいずれかもしくは、混合物
もしくは、共重合物は、可撓性に富み好ましい。Among the long-chain hydrocarbon resins, any one of a polyisobutene resin which is a polymer of isobutene and a polybutene resin which is a polymer of normal butene, or a mixture or a copolymer thereof is preferable because of its high flexibility.
【００１０】イソブテンの重合体であるポリイソブテン
樹脂やノルマルブテンの重合体であるのポリブテン樹脂
のいずれかもしくは、混合物もしくは、共重合物の平均
分子量は、１０００〜３００００のものが好適に用いら
れる。The polyisobutene resin, which is a polymer of isobutene, and the polybutene resin, which is a polymer of normal butene, or a mixture or a copolymer thereof having an average molecular weight of 1,000 to 30,000 is preferably used.
【００１１】平均分子量がこの範囲であると、樹脂の自
重による変形もなく、タングステン粉末とも容易に均一
に混合されるので好ましい。When the average molecular weight is within this range, there is no deformation due to the weight of the resin, and the tungsten powder can be easily and uniformly mixed, which is preferable.
【００１２】ここでの平均分子量とは、平均分子量２０
０００未満に関しては蒸気圧浸透圧法での値が適用さ
れ、平均分子量が２００００以上に関しては、粘度平均
分子量を適用した。The average molecular weight here means an average molecular weight of 20.
When the average molecular weight is 20000 or more, the viscosity average molecular weight is applied.
【００１３】なお、本塑性物には、本発明の目的を損な
わない範囲で、酸化防止剤、熱安定剤、紫外線吸収剤、
着色剤等を添加することが出来る。Incidentally, the present plastic material includes an antioxidant, a heat stabilizer, an ultraviolet absorber, and an ultraviolet absorber within a range not impairing the object of the present invention.
A colorant or the like can be added.
【００１４】本発明に使用するタングステン粉末は、ベ
ース樹脂に均一に分散させる必要があることから、平均
粒径が５〜１００μｍの物が好ましく用いられる。Since the tungsten powder used in the present invention needs to be uniformly dispersed in the base resin, a tungsten powder having an average particle diameter of 5 to 100 μm is preferably used.
【００１５】タングステン粉末の表面をアミノシラン等
でカップリング処理することは、樹脂への分散性を上
げ、かつ樹脂からの脱落防止となり有効である。Coupling the surface of the tungsten powder with aminosilane or the like is effective in improving dispersibility in the resin and preventing the tungsten powder from falling off.
【００１６】タングステン粉末の割合は、９７〜８０重
量％が必要であり、より高い放射線遮蔽性を得るために
は、９７〜９０重量％がより好ましい。タングステン粉
末の割合が８０重量％未満の場合には、ベース樹脂中へ
の分散に斑が生じ易くなる為、さらに最悪の場合は、未
分散部分が生じ放射線遮蔽のピンホールが生じる。ま
た、タングステン粉末の割合が９７重量％を超える場合
には、ベース樹脂中へ完全に分散させることが出来ず、
複合物を塑性変形させようとした場合、容易にちぎれ
る。The proportion of the tungsten powder is required to be 97 to 80% by weight, and 97 to 90% by weight is more preferable in order to obtain a higher radiation shielding property. When the proportion of the tungsten powder is less than 80% by weight, unevenness in dispersion in the base resin is likely to occur, and in the worst case, an undispersed portion occurs and a radiation shielding pinhole occurs. Further, when the ratio of the tungsten powder exceeds 97% by weight, it cannot be completely dispersed in the base resin,
When trying to plastically deform a composite, it is easily torn.
【００１７】[0017]
【発明の効果】本発明の放射線遮蔽用樹脂組成物によ
り、鉛害の無い塑性変形可能な放射線遮蔽性材料として
使用することが出来る。The radiation shielding resin composition of the present invention can be used as a radiation shielding material which is free from lead damage and is plastically deformable.
【００１８】[0018]
【実施例】以下、実施例によって本発明を詳細に説明す
る。実施例に先立ちって、ベース樹脂とタングステン粉
末の複合化方法について説明する。所定量のベース樹脂
とタングステン粉末を常温にて高速攪拌翼付き混合機
（スーパーミキサー）で予備混合した後、スクリュー径
２５ｍｍの単軸押出し機で１００℃にて混練し、複合樹
脂を得た。The present invention will be described in detail below with reference to examples. Prior to the examples, a method of compounding the base resin and the tungsten powder will be described. A predetermined amount of base resin and tungsten powder were premixed at room temperature with a mixer (super mixer) equipped with a high-speed stirring blade, and then kneaded at 100 ° C. with a single-screw extruder having a screw diameter of 25 mm to obtain a composite resin.
【００１９】（実施例１〜４、比較例１〜４）表１に示
したベース樹脂およびタングステン粉末の比率にて、上
記方法にて複合させた。得られた複合樹脂を５ｍｍ厚さ
の板状に形成し、工業用Ｘ−レイフィルム（富士写真フ
ィルム製 ＥＮＶＥＬＯＰＡＫ）上に置き、６０ｋＶ、
２００ｍＡ、０．０４秒の露光を行った後、常法にて現
像を行いＸ線の遮蔽性を評価した。評価結果を表１に合
わせて示した。(Examples 1 to 4 and Comparative Examples 1 to 4) The base resin and the tungsten powder shown in Table 1 were mixed in the above-mentioned method at the ratio. The obtained composite resin was formed into a plate shape having a thickness of 5 mm, placed on an industrial X-ray film (ENVELOPAK manufactured by Fuji Photo Film), and 60 kV,
After exposure at 200 mA for 0.04 seconds, development was carried out by a conventional method to evaluate the X-ray shielding property. The evaluation results are also shown in Table 1.
【００２０】[0020]
【表１】 [Table 1]
Claims (2)
樹脂塑性物であって、ベース樹脂の１００℃における動
粘度が５００〜３０００００ｃＳｔであり、タングステ
ン粉末の比率が９７〜８０重量％であることを特徴とす
る放射線遮蔽用樹脂組成物。1. A resin plastic material comprising a base resin and a tungsten powder, wherein the base resin has a kinematic viscosity at 100 ° C. of 500 to 300,000 cSt, and a tungsten powder ratio of 97 to 80% by weight. A resin composition for radiation shielding.
リブテン樹脂のいずれかもしくは、混合物もしくは、共
重合物であり、その平均分子量が１０００〜３００００
であることを特徴とする請求項１記載の放射線遮蔽用樹
脂組成物。2. The base resin is a polyisobutene resin, a polybutene resin, a mixture or a copolymer, and the average molecular weight thereof is 1,000 to 30,000.
The radiation-shielding resin composition according to claim 1, wherein
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002127805A JP2003321614A (en) | 2002-04-30 | 2002-04-30 | Plastically deformable radiation-shielding resin composition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002127805A JP2003321614A (en) | 2002-04-30 | 2002-04-30 | Plastically deformable radiation-shielding resin composition |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2003321614A true JP2003321614A (en) | 2003-11-14 |
| JP2003321614A5 JP2003321614A5 (en) | 2005-06-09 |
Family
ID=29541758
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2002127805A Pending JP2003321614A (en) | 2002-04-30 | 2002-04-30 | Plastically deformable radiation-shielding resin composition |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2003321614A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007513251A (en) * | 2003-12-05 | 2007-05-24 | バー−レイ・プロダクツ・インコーポレーテッド | Low weight ultra thin flexible radiation attenuating composition |
| JP2008093332A (en) * | 2006-10-16 | 2008-04-24 | Shimadzu Corp | X-ray movable diaphragm device |
| CN103165208A (en) * | 2011-12-09 | 2013-06-19 | 株式会社富士克 | Radiation shield body and radiation shield product using the same |
| WO2022072281A1 (en) * | 2020-09-29 | 2022-04-07 | Pennzsuppress Corp. | Anticorrosive agents and methods of manufacture and use |
-
2002
- 2002-04-30 JP JP2002127805A patent/JP2003321614A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007513251A (en) * | 2003-12-05 | 2007-05-24 | バー−レイ・プロダクツ・インコーポレーテッド | Low weight ultra thin flexible radiation attenuating composition |
| JP2008093332A (en) * | 2006-10-16 | 2008-04-24 | Shimadzu Corp | X-ray movable diaphragm device |
| CN103165208A (en) * | 2011-12-09 | 2013-06-19 | 株式会社富士克 | Radiation shield body and radiation shield product using the same |
| WO2022072281A1 (en) * | 2020-09-29 | 2022-04-07 | Pennzsuppress Corp. | Anticorrosive agents and methods of manufacture and use |
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