JP2013108931A - Fire retardant/incombustible radiation shield member, and laminate member, structural member or case using fire retardant/incombustible radiation shield member - Google Patents
Fire retardant/incombustible radiation shield member, and laminate member, structural member or case using fire retardant/incombustible radiation shield member Download PDFInfo
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Abstract
Description
本発明は、難燃・不燃性と放射線遮蔽性を備えた部材及びそれを用いた構造物及びケースに関する。 The present invention relates to a member having flame retardancy / incombustibility and radiation shielding, and a structure and a case using the member.
放射線を取り扱う診断、医療用設備あるいは放射線の発生する恐れがある原子力発電所等の施設においては、放射線が外部にもれないように遮蔽する必要がある。
また、放射線に汚染された土壌やガレキ等の放射性汚染物質の保管においても放射線が外に放出されないようにする必要がある。
さらには、これらの設備を取り扱う場所や施設においては、放射線の遮蔽のみならず、難燃又は不燃性が要求される場合も多い。
特許文献１には、コンクリートの間にボロン含有シートを挟んだり、あるいはボロン含有の低放射化コンクリートを用いた中性子線遮蔽構造体を開示するが、コンクリート打ち作業は大変であり、汎用性に劣る問題もあった。
また、コンクリート中にはホウ素を約３％程度しか含有させることができないので、中性子線の遮蔽効果も不充分である。
In facilities such as diagnostics, medical facilities, or nuclear power plants where radiation may be generated, it is necessary to shield the radiation so that it does not pass outside.
Moreover, it is necessary to prevent radiation from being released to the outside even when storing radioactive pollutants such as soil and rubble contaminated by radiation.
Furthermore, in places and facilities where these facilities are handled, not only radiation shielding but also flame retardancy or incombustibility is often required.
Patent Document 1 discloses a neutron beam shielding structure using a boron-containing sheet sandwiched between concrete or using low-activation concrete containing boron, but the concrete placing work is difficult and inferior in versatility. There was also a problem.
Moreover, since only about 3% of boron can be contained in the concrete, the effect of shielding neutron beams is insufficient.
本発明は難燃性、不燃性と放射線の遮蔽性に優れたシート部材等の提供を目的とする。
また、このシート部材と積層することでα線，β線，γ線，χ線及び中性子線等を総合的に遮蔽できる難燃性、不燃性の構造物やケース等の提供も目的とする。
An object of this invention is to provide the sheet | seat member etc. which were excellent in the flame retardance, nonflammability, and the shielding property of a radiation.
Another object of the present invention is to provide a flame-retardant and non-combustible structure or case capable of comprehensively shielding α rays, β rays, γ rays, χ rays, neutron rays and the like by laminating with this sheet member.
放射線には、α線，β線，γ線，χ線及び中性子線等が存在する。
このうち、α線は紙や木材で遮蔽でき、β線はアルミニウム等の薄い金属板で遮蔽でき、γ線及びχ線は鉛，鉄，タングステン等の比較的重い金属にて遮蔽できる。
また、中性子線は水やパラフィン及び特許文献１に記載されるようにホウ素を含有する材料にて遮蔽することができる。
Radiation includes α rays, β rays, γ rays, χ rays, neutron rays, and the like.
Of these, α rays can be shielded by paper or wood, β rays can be shielded by a thin metal plate such as aluminum, and γ rays and χ rays can be shielded by relatively heavy metals such as lead, iron, tungsten.
Further, the neutron beam can be shielded with water, paraffin or a material containing boron as described in Patent Document 1.
また、ポリホウ酸ナトリウムは約１５０℃以上の温度にて発泡し、難燃性や不燃性を発現することが本発明者らの実験により確認されていて、本願出願人である株式会社トラストライフから商品名ファイアレスＢとして販売されている。
本発明はこれらを複合的に考慮することで完成したものである。
In addition, sodium polyborate is foamed at a temperature of about 150 ° C. or more, and has been confirmed by experiments of the present inventors to express flame retardancy and incombustibility, from Trust Life Co., Ltd., the applicant of the present application. It is sold under the trade name Fireless B.
The present invention has been completed by considering these in combination.
本発明に係る難燃・不燃性放射線遮蔽部材は、樹脂組成物中に、当該樹脂組成物に対する質量％で、５〜２００％のポリホウ酸ナトリウムの粉末と、１０〜４００％の金属の粉末又はフィラーとを混合したことを特徴とする。
本発明で樹脂組成物はポリホウ酸ナトリウムの粉末及び金属の粉末、フィラーを分散保持するマトリックスとして作用する。
The flame-retardant / incombustible radiation shielding member according to the present invention is a resin composition in mass% with respect to the resin composition, 5 to 200% sodium polyborate powder and 10 to 400% metal powder or It is characterized by mixing a filler.
In the present invention, the resin composition acts as a matrix for dispersing and holding sodium polyborate powder, metal powder, and filler.
ポリホウ酸ナトリウムの粉末とは、ポリホウ酸ナトリウムが成分として含まれている粉末を意味し、ポリホウ酸ナトリウムの溶液を噴霧乾燥させると平均粒径１０〜３０μｍの粉末を得ることができる。
また、ジェットミル等にて平均粒径１０μｍ以下の１〜５μｍの微粉末にして混合することもできる。
ポリホウ酸ナトリウムは発泡により難燃性、不燃性を発現するとともにホウ素は主に中性子線を遮蔽する。
ここで難燃性は例えば米国「Underwriter's Laboratoies,Inc」が制定した９４Ｖ，９４ＶＴＭに規定されている。
難燃性は試験材に火炎を当てると火が付くが、この火炎を遠ざけるとすぐに自己消火するレベルをいう。
不燃性は例えばＪＩＳ Ａ １３２３，Ａ種〜Ｃ種として規定されている。
不燃性は火炎を試験材に当てても着火しないことをいう。
ポリホウ酸ナトリウムの粉末を樹脂組成物に対して質量比で５〜２００％の範囲にて混合比率を上げることで難燃性から不燃性まで調整できる。
The sodium polyborate powder means a powder containing sodium polyborate as a component, and when a sodium polyborate solution is spray-dried, a powder having an average particle size of 10 to 30 μm can be obtained.
Moreover, it can also be made into 1-5 micrometers fine powder with an average particle diameter of 10 micrometers or less with a jet mill etc., and can be mixed.
Sodium polyborate exhibits flame retardancy and nonflammability by foaming, and boron mainly shields neutron rays.
Here, the flame retardancy is defined in 94V, 94VTM established by “Underwriter's Laboratoies, Inc.”, for example.
Flame retardance is the level at which self-extinguishing occurs as soon as the flame is applied to the test material, but the flame ignites.
Nonflammability is defined as, for example, JIS A 1323, Class A to Class C.
Nonflammability means that it does not ignite even when a flame is applied to a test material.
By increasing the mixing ratio of sodium polyborate powder in a mass ratio of 5 to 200% with respect to the resin composition, the powder can be adjusted from flame retardancy to nonflammability.
金属はβ線等を遮蔽する力があり、鉛やタングステン等の重金属はγ線，χ線等も遮蔽することから、樹脂組成物にこれらの金属を粉末又はフィラーにして混合することでこれらの放射線遮蔽部材として利用できることが発明者らの実験で明らかになった。
また、タングステンには鉄、コバルト、銅等が含まれていてもよい。
金属粉末等の配合料は樹脂組成物に対して１０〜４００質量％の範囲で調整可能である。
Metals have the ability to shield beta rays, etc., and heavy metals such as lead and tungsten also shield gamma rays, chi-rays, etc., so these metals can be mixed with the resin composition as powders or fillers. The inventors' experiments revealed that it can be used as a radiation shielding member.
Tungsten may contain iron, cobalt, copper and the like.
Compounding ingredients such as metal powder can be adjusted in the range of 10 to 400% by mass with respect to the resin composition.
樹脂組成物中にこれらのポリホウ酸ナトリウムの粉末や金属の粉末等を分散させるには、樹脂組成物に溶融混合するのが好ましい。
この場合に射出成形，押出，延伸等にて成形体，シート材，フィルム材等を製造する際に樹脂組成物を加熱溶融することになるが、ポリホウ酸ナトリウムは約１５０℃以上で発泡することから、溶融温度が１５０℃以下、好ましくは１４０℃以下の樹脂組成物を用いるのが好ましい。
このような樹脂組成物にはエチレン−酢酸ビニル共重合体が好適である。
この樹脂は酢酸ビニルの配合量を相対的に多くすることで、例えば融点を９５℃以下に下げることも可能であるとともにポリホウ酸ナトリウムとの親和性が高い。
例えば樹脂組成物中の酢酸ビニルの含有量を１０質量％にすると融点が約９４℃で、３３質量％にすると融点が約６１℃になる。
In order to disperse these sodium polyborate powder, metal powder, and the like in the resin composition, it is preferable to melt and mix the resin composition.
In this case, the resin composition is heated and melted when producing a molded body, sheet material, film material, etc. by injection molding, extrusion, stretching, etc., but sodium polyborate foams at about 150 ° C. or more. Therefore, it is preferable to use a resin composition having a melting temperature of 150 ° C. or lower, preferably 140 ° C. or lower.
An ethylene-vinyl acetate copolymer is suitable for such a resin composition.
By relatively increasing the blending amount of vinyl acetate, this resin can lower the melting point to 95 ° C. or lower, for example, and has high affinity with sodium polyborate.
For example, when the content of vinyl acetate in the resin composition is 10% by mass, the melting point is about 94 ° C., and when 33% by mass, the melting point is about 61 ° C.
このようなポリホウ酸ナトリウムの粉末と金属の粉末等を分散させた樹脂材料を用いてシート状に成形したシート部材は、放射線を取り扱う設備や放射線汚染物質を簡易的に覆うのに便利である。
また、シート部材に成形する際に綿布，化学繊維布，不織布等を内層とし、これに樹脂組成物にポリホウ酸ナトリウム及び金属粉末等を混合したものを練り込み、３層構造にしてもよい。
A sheet member formed into a sheet shape using such a resin material in which sodium polyborate powder, metal powder, and the like are dispersed is convenient for easily covering facilities that handle radiation and radiation contaminants.
Further, when forming into a sheet member, cotton cloth, chemical fiber cloth, non-woven fabric or the like may be used as an inner layer, and a resin composition in which sodium polyborate and metal powder are mixed may be kneaded into a three-layer structure.
上記のシート部材のみではパネル材や構造物として利用しにくい場合には、シート状に成形した請求項１記載の難燃・不燃性放射線遮蔽部材と、ポリホウ酸ナトリウムを含浸させた木質パネル部材とを張り合せた積層部材にしたり、金属製パネル材に、ポリホウ酸ナトリウムを含浸させた木質パネル部材又は／及びシート状に成形した請求項１記載の難燃・不燃性放射線遮蔽部材とを積層部材にすることができる。
このような積層部材にすると建物の壁や室内を仕切る構造部材にすることも放射線で汚染された土壌やガレキの簡易保管ケースにすることもできる。
ケースは汚染物を収納できるものであれば、コンテナ型の容器でもボックス体でもよい。
ケースにするとそのまま中間処理場に持ち込み、保管することもできる。
The flame retardant / incombustible radiation shielding member according to claim 1 formed into a sheet shape and a wood panel member impregnated with sodium polyborate, when the sheet member alone is difficult to be used as a panel material or a structure. A laminated member obtained by laminating a metal panel material, a wooden panel member impregnated with sodium polyborate, and / or a flame retardant / incombustible radiation shielding member according to claim 1 formed into a sheet shape. Can be.
When such a laminated member is used, it can be used as a structural member for partitioning a building wall or a room, or a simple storage case for soil or rubble contaminated by radiation.
The case may be a container-type container or a box as long as it can store contaminants.
If it is a case, it can be brought into an intermediate treatment plant and stored.
木質のパネル（板材）にポリホウ酸ナトリウムを含浸させる方法としては、単板や合板等のパネル材にポリホウ酸ナトリウムの溶液を含浸させることで得られる。
ポリホウ酸ナトリウムの含浸量は５０〜２００ｋｇ／ｍ３（木質）の範囲が好ましい。
５０ｋｇ未満では難燃性効果が小さく、２００ｋｇを超えて含浸させてもそれ以上の不燃化効果が小さい。
As a method of impregnating a wooden panel (plate material) with sodium polyborate, it is obtained by impregnating a panel material such as a single plate or plywood with a solution of sodium polyborate.
The amount of sodium polyborate impregnated is preferably in the range of 50 to 200 kg / m 3 (wood).
If it is less than 50 kg, the flame-retardant effect is small, and even if impregnated in excess of 200 kg, the further non-flammability effect is small.
本発明に係る難燃・不燃性放射線遮蔽部材はシート材，フィルム材，射出成形部材等に容易に成形が可能であり、ポリホウ酸ナトリウムによる優れた難燃・不燃性と中性子線等の優れた放射線遮蔽性が得られる。
また、このようにして得られたシート材は、はさみ等で容易に切断加工ができる。
ポリホウ酸ナトリウムを含浸させた木質パネル部材や金属製パネル材と組み合せることで、難燃・不燃性のある放射線遮蔽構造物や放射線汚染物物質の保管ケースとしても利用できる。
The flame retardant / incombustible radiation shielding member according to the present invention can be easily formed into a sheet material, a film material, an injection molded member, etc., and has excellent flame retardant / incombustibility due to sodium polyborate and excellent neutron radiation, etc. Radiation shielding is obtained.
Moreover, the sheet material obtained in this way can be easily cut with scissors or the like.
Combining with a wooden panel member or metal panel material impregnated with sodium polyborate, it can be used as a storage case for radiation shielding structures and radiation pollutants that are incombustible and incombustible.
エチレン−酢酸ビニル共重合樹脂（ＥＶＡ樹脂）に、株式会社トラストライフ社のファイアレスＢリキッド（固形分濃度約２３％，比重１．１，ｐＨ＝７）を噴霧乾燥させたポリホウ酸ナトリウムの粉末をＥＶＡ樹脂に対して質量比で約５０％を混合し、さらにタングステンの粉末をＥＶＡ樹脂に対して質量比で約３〜４倍混合した。
これを用いて、内材としてポリホウ酸ナトリウムを含浸させた綿生地を用い、３層構造の厚み約１ｍｍのシート材を得た。
このシート材の比重は約９．０であった。
福島県本官市内で採取した１１．０μＳｖ／ｈの汚染土にこのシート材を被せて同様に放射線量を計測したところ、５．０μＳｖ／ｈと放射線量が約５５％減少した。
これにより、放射線の遮蔽効果が高いことが明らかになった。
また、このシート材を厚み９．０ｍｍの合板の内側に張り合せ、この合板の外側に０．５ｍｍの厚みのアルミ板又は鉄板を張り合せた３層の積層部材を用いて、幅１８０ｃｍ×長さ３６０ｃｍ×高さ９０ｃｍのケース（コンテナ）を試作した。
このようなケースは中に放射線汚染物質を入れることで外部への放射線の放出を大幅に低減することができる。
また、ケースのサイズの統一化を図ることで中間貯蔵施設への搬入及び保管が容易になると思われる。
Sodium polyborate powder obtained by spray-drying Trust Life Co., Ltd. Fireless B Liquid (solid content concentration: about 23%, specific gravity: 1.1, pH = 7) on ethylene-vinyl acetate copolymer resin (EVA resin) About 50% by mass ratio with respect to the EVA resin, and further tungsten powder was mixed with the EVA resin at a mass ratio of about 3 to 4 times.
Using this, a cotton fabric impregnated with sodium polyborate as an inner material was used to obtain a sheet material having a three-layer structure and a thickness of about 1 mm.
The specific gravity of this sheet material was about 9.0.
When this sheet material was covered with 11.0 μSv / h contaminated soil collected in Fukushima Prefecture, the radiation dose was similarly measured, and the radiation dose was reduced by about 55% to 5.0 μSv / h.
This revealed that the radiation shielding effect was high.
Also, this sheet material is laminated on the inner side of a 9.0 mm thick plywood, and a laminated member of three layers in which an aluminum plate or a steel plate of 0.5 mm thickness is laminated on the outer side of this plywood, 180 cm wide × long A case (container) having a length of 360 cm and a height of 90 cm was prototyped.
In such a case, the radiation emission to the outside can be greatly reduced by putting a radioactive contaminant inside.
In addition, it will be easier to carry in and store the intermediate storage facility by unifying the case size.
Claims (6)
１０〜４００％の金属の粉末又はフィラーとを混合したことを特徴とする難燃・不燃性放射線遮蔽部材。 In the resin composition, 5% to 200% of sodium polyborate powder in mass% relative to the resin composition;
A flame-retardant / incombustible radiation shielding member, wherein 10 to 400% of metal powder or filler is mixed.
前記金属の粉末又はフィラーは、鉛又はタングステンあるいはそれらの合金であることを特徴とする請求項１〜３のいずれかに記載の難燃・不燃性放射線遮蔽部材又は積層部材。 The resin composition is an ethylene-vinyl acetate copolymer resin,
The flame retardant / incombustible radiation shielding member or laminated member according to claim 1, wherein the metal powder or filler is lead, tungsten, or an alloy thereof.
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| JP2013018878A (en) * | 2011-07-12 | 2013-01-31 | Trust Life:Kk | Nonflammable and radiation shielding sheet |
| JP2014111371A (en) * | 2012-11-08 | 2014-06-19 | Yoshda Fusa Orimono Kk | Flame-retardant tabular object, toxic gas generation-inhibiting rug using flame-retardant tabular object, and method for manufacturing toxic gas generation-inhibiting rug |
| JP2015052544A (en) * | 2013-09-09 | 2015-03-19 | アキレス株式会社 | Radiation shielding sheet |
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| JP2018132387A (en) * | 2017-02-14 | 2018-08-23 | 日本製紙株式会社 | Radiation shielding material |
| CN108250557A (en) * | 2018-01-19 | 2018-07-06 | 东莞理工学院 | A kind of flexibility low hydrogen neutron shielding material and preparation method thereof |
| JP2020126038A (en) * | 2019-02-04 | 2020-08-20 | 株式会社安藤・間 | Activation suppression structure and method for managing wall body |
| CN113348519A (en) * | 2019-02-04 | 2021-09-03 | 株式会社安藤·间 | Radioactivity suppression structure and wall body management method |
| JP7450365B2 (en) | 2019-02-04 | 2024-03-15 | 株式会社安藤・間 | Activation suppression structure |
| CN112063159A (en) * | 2020-09-07 | 2020-12-11 | 圣华盾防护科技股份有限公司 | Breathable X/gamma ray shielding composite material and preparation method thereof |
| CN112063159B (en) * | 2020-09-07 | 2022-09-16 | 圣华盾防护科技股份有限公司 | Breathable X/gamma ray shielding composite material and preparation method thereof |
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