JPH0476080B2 - - Google Patents
Info
- Publication number
- JPH0476080B2 JPH0476080B2 JP59094261A JP9426184A JPH0476080B2 JP H0476080 B2 JPH0476080 B2 JP H0476080B2 JP 59094261 A JP59094261 A JP 59094261A JP 9426184 A JP9426184 A JP 9426184A JP H0476080 B2 JPH0476080 B2 JP H0476080B2
- Authority
- JP
- Japan
- Prior art keywords
- silicone rubber
- powder
- iron powder
- silica powder
- specific gravity
- 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.)
- Expired - Lifetime
Links
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 40
- 239000000843 powder Substances 0.000 claims description 20
- 239000000377 silicon dioxide Substances 0.000 claims description 20
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 19
- 239000004945 silicone rubber Substances 0.000 claims description 19
- 230000005484 gravity Effects 0.000 claims description 13
- 230000005251 gamma ray Effects 0.000 claims description 11
- 229920002631 room-temperature vulcanizate silicone Polymers 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 9
- 238000011049 filling Methods 0.000 claims description 8
- 239000002245 particle Substances 0.000 claims description 7
- 239000000203 mixture Substances 0.000 description 14
- 229920002379 silicone rubber Polymers 0.000 description 9
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 6
- 238000002156 mixing Methods 0.000 description 6
- 239000001301 oxygen Substances 0.000 description 6
- 229910052760 oxygen Inorganic materials 0.000 description 6
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 5
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000003063 flame retardant Substances 0.000 description 3
- 230000001771 impaired effect Effects 0.000 description 3
- 206010027439 Metal poisoning Diseases 0.000 description 2
- -1 alkyl silicate Chemical compound 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 238000009472 formulation Methods 0.000 description 2
- 208000008127 lead poisoning Diseases 0.000 description 2
- 239000004971 Cross linker Substances 0.000 description 1
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 229920005645 diorganopolysiloxane polymer Polymers 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000012779 reinforcing material Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000004073 vulcanization Methods 0.000 description 1
Landscapes
- Compositions Of Macromolecular Compounds (AREA)
- Glass Compositions (AREA)
Description
【発明の詳細な説明】
この発明はガンマ線遮蔽材に関するもので、と
くに二成分系すなわち二液性室温加硫型シリコン
ゴム組成物の改良に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to gamma ray shielding materials, and in particular to improvements in two-component, two-component room temperature vulcanizable silicone rubber compositions.
二成分系室温加硫型（以下RTV＝room temp.
vulcanizableを略記する）シリコンゴム組成物は
公知である。一般に、この種のシリコンゴム組成
物は、ジオルガノポリシロキサン重合体、架橋材
としてのアルキルシリケート及び適当な硬化用触
媒例えばカルボン酸の塩からなる。これら組成物
はすべての成分を同じパツケージに収容しないと
いう意味で二成分系すなわち二液性である。使用
するときには、二成分を混合して室温で硬化させ
る。 Two-component room temp vulcanization type (RTV=room temp.
Silicone rubber compositions (abbreviated as vulcanizable) are known. Generally, silicone rubber compositions of this type consist of a diorganopolysiloxane polymer, an alkyl silicate as a crosslinker, and a suitable curing catalyst, such as a salt of a carboxylic acid. These compositions are two-component or two-part in the sense that all the ingredients are not contained in the same package. When used, the two components are mixed and allowed to cure at room temperature.
代表的なシリコンゴム組成物の硬化反応を示せ
ば次の通りである。 The curing reaction of typical silicone rubber compositions is as follows.
このようなシリコンゴム組成物には各種用途が
あり、そしてそのなかには放射線の遮蔽材として
の用途もある。例えば、Ｘ線遮蔽能を有する難燃
性シリコン組成物が特開昭54−83958号公報に記
載されている。 Such silicone rubber compositions have various uses, including as radiation shielding materials. For example, a flame-retardant silicone composition having X-ray shielding ability is described in JP-A-54-83958.
一方、二液性RTVシリコンゴムをベースとし、
これに珪石粉あるいは鉛粉末を混合して得たガン
マ線遮蔽部材がある。 On the other hand, based on two-component RTV silicone rubber,
There is a gamma ray shielding material obtained by mixing silica powder or lead powder with this material.
ベースのシリコンゴムに充填材を混合した後、
所定の型に流し込んで硬化させることにより成形
ブロツクをつくるが、ほとんどの場合原子力発電
所等の施工現場でシリコンゴムと充填材とを混合
して流し込み施工している。従つて、微細な隙間
にも流れ込むように十分な流動性を有していなけ
ればならない。 After mixing the filler into the base silicone rubber,
Molded blocks are made by pouring into a predetermined mold and letting it harden, but in most cases silicone rubber and filler are mixed and poured at construction sites such as nuclear power plants. Therefore, it must have sufficient fluidity to flow into even minute gaps.
上記ガンマ線遮蔽材は通常比重が2.4前後であ
る。一方、シリコンゴムの補強材−難燃材として
珪石粉を使用するが、その真比重が低いので、比
重2.4の成形ブロツクを成形するためにはかなり
多量の珪石粉を充填する必要がある。しかし、多
量の珪石粉の充填は流動性の低下をもたらす。こ
のため、流動性の低下を防ぐために、鉛粉末を併
用して、2.4の比重を維持している。 The gamma ray shielding material mentioned above usually has a specific gravity of around 2.4. On the other hand, silica powder is used as a reinforcing material/flame retardant for silicone rubber, but since its true specific gravity is low, it is necessary to fill a considerably large amount of silica powder in order to mold a molded block with a specific gravity of 2.4. However, filling a large amount of silica powder leads to a decrease in fluidity. Therefore, to prevent fluidity from decreasing, lead powder is used in combination to maintain a specific gravity of 2.4.
しかし、鉛粉末の使用は、それを扱う者の体内
吸込みが避けられず、衛生上、鉛毒発生が問題と
なつている。また、前記ガンマ線遮蔽材は耐燃焼
性のひとつの指標である酸素指数が30前後と低
く、耐燃焼性にも問題がある。 However, when using lead powder, it is inevitable that it will be inhaled into the bodies of those who handle it, and lead poisoning is a hygienic problem. In addition, the gamma ray shielding material has a low oxygen index of around 30, which is one indicator of combustion resistance, and has a problem in flame resistance.
この発明の目的は施工性（流動性）に優れ、か
つ耐燃焼性を改良した二液性RTVシリコンゴム
をベースとしたガンマ線遮蔽材を提供することに
ある。この発明によれば、上記目的は二液性
RTVシリコンゴムの二液を混合後、得られた混
合物に所定粒度の鉄粉および珪石粉を所定量混合
すれば達成できる。 The object of this invention is to provide a gamma ray shielding material based on two-component RTV silicone rubber that has excellent workability (fluidity) and improved flame resistance. According to this invention, the above purpose is achieved by
This can be achieved by mixing two components of RTV silicone rubber and then mixing a predetermined amount of iron powder and silica powder with a predetermined particle size into the resulting mixture.
従来と同様に、鉄粉および珪石粉とシリコンゴ
ム混合液との混合は施工現場で行つてもよく、あ
るいは予め混合して成形ブロツクを成形しておい
てもよく、用途・目的に応じて行えばよい。 As in the past, the iron powder, silica stone powder, and silicone rubber mixture may be mixed at the construction site, or may be mixed in advance and formed into a molded block, depending on the use and purpose. That's fine.
この発明に使用する鉄粉および珪石粉の好まし
い粒度はそれぞれ50〜150μおよび１〜70μであ
り、そして好ましい充填量はそれぞれ55〜60重量
％および20〜25重量％である。 The preferred particle sizes of the iron powder and silica powder used in this invention are 50-150μ and 1-70μ, respectively, and the preferred loadings are 55-60% by weight and 20-25% by weight, respectively.
珪石粉の粒度が1μ以下では混合物の粘度が上
昇し、流動性が損なわれる。70μ以上では、粒度
が大きくて、鉄粉の沈降防止効果が低下する。 If the particle size of the silica powder is less than 1 μm, the viscosity of the mixture increases and fluidity is impaired. If it is 70μ or more, the particle size is large and the effect of preventing iron powder from settling is reduced.
鉄粉の充填量が55％以下では、成形体の比重が
2.4にならず、60％以上では、混合物の粘度が上
昇し、流動性が損なわれる。また、珪石粉を充填
せずに、鉄粉のみを二液性RTVシリコンゴムに
混合して比重2.4の成形体を得るためには、さら
に多量の鉄粉を充填する必要があり、この場合酸
素指数は向上せず、耐燃焼性は改良できない。 If the filling amount of iron powder is less than 55%, the specific gravity of the compact will be
If it is not 2.4 and exceeds 60%, the viscosity of the mixture will increase and the fluidity will be impaired. In addition, in order to obtain a molded product with a specific gravity of 2.4 by mixing only iron powder with two-component RTV silicone rubber without filling silica powder, it is necessary to fill a larger amount of iron powder, and in this case, oxygen The index cannot be improved and the flame resistance cannot be improved.
珪石粉の充填量が20％以下では、鉄粉の沈降防
止効果および難燃効果がない。また、珪石粉の充
填量が25％以上では混合物の粘度が上昇し、流動
性が損なわれる。 If the filling amount of silica powder is 20% or less, there is no effect of preventing settling of iron powder and no flame retardant effect. Furthermore, if the filling amount of silica powder is 25% or more, the viscosity of the mixture increases and fluidity is impaired.
前述したように流動性を損なわずに比重2.3〜
2.5の成形体を得るためには、珪石粉と鉄粉とを
組合わせて使用しなければならない。珪石粉の単
独使用では、良好な流動性を保持する比重2.4以
上の成形体は得られない。また、鉄粉だけでは、
硬化時に鉄粉が沈降するが、珪石粉を混合するこ
とにより、鉄粉の沈降が防止でき、硬化成形体の
比重分布が均一化し、従つてガンマ線遮蔽能が均
一化する。 As mentioned above, specific gravity is 2.3~ without impairing fluidity.
In order to obtain a compact of 2.5, a combination of silica powder and iron powder must be used. If silica powder is used alone, a molded article with a specific gravity of 2.4 or more that maintains good fluidity cannot be obtained. In addition, iron powder alone
Iron powder settles during hardening, but by mixing silica powder, precipitation of iron powder can be prevented, the specific gravity distribution of the cured molded product becomes uniform, and the gamma ray shielding ability becomes uniform.
耐燃焼性の尺度である酸素指数についていえ
ば、鉄粉と珪石粉とが配合されているため、成形
体の酸素指数は45にもなり、二液性RTVシリコ
ンゴムおよび従来の鉛粉を充填したガンマ線遮蔽
材より耐燃焼性が向上する。また、鉛粉を配合し
ないため、鉛毒の恐れもない。 Regarding the oxygen index, which is a measure of flame resistance, the molded product has an oxygen index of 45 due to the combination of iron powder and silica powder, and is filled with two-component RTV silicone rubber and conventional lead powder. The flame resistance is improved compared to gamma ray shielding materials. Also, since it does not contain lead powder, there is no risk of lead poisoning.
以下、実施例により、この発明を具体的に説明
する。 Hereinafter, the present invention will be specifically explained with reference to Examples.
実施例 １
二液性RTVシリコンゴムと鉄粉、珪石粉を次
に記した配合で混合して、型に流し込み、硬化さ
せて成形体を得た。Example 1 Two-component RTV silicone rubber, iron powder, and silica powder were mixed in the following formulation, poured into a mold, and cured to obtain a molded product.
wt％
二液性RTVシリコンゴム 20
鉄 粉 56
珪石粉 24
この成形体の比重は、2.45であつた。またＢ型
回転粘度計で測定した粘度は20000〜25000cpで、
十分流動性を有していた。さらにこの成形体の酸
素指数は44.9であつた。また硬化時における鉄粉
の沈降もなく、成形体全体での比重が均一であつ
た。 wt% Two-component RTV silicone rubber 20 Iron powder 56 Silica powder 24 The specific gravity of this molded product was 2.45. In addition, the viscosity measured with a B-type rotational viscometer was 20,000 to 25,000 cp.
It had sufficient liquidity. Furthermore, the oxygen index of this compact was 44.9. Further, there was no settling of iron powder during curing, and the specific gravity of the entire molded product was uniform.
実施例 ２
二液性RTVシリコンゴムと鉄粉、珪石粉を次
に記した配合で混合して、型に流し込み、硬化さ
せて成形体を得た。Example 2 Two-component RTV silicone rubber, iron powder, and silica powder were mixed in the following formulation, poured into a mold, and cured to obtain a molded product.
wt％
二液性RTVシリコンゴム 21
鉄 粉 58
珪石粉 21
この成形体の比重は、2.48、粘度は、15000〜
20000cpで、流動性を有していた。また酸素指数
は45.5であつた。 wt% Two-component RTV silicone rubber 21 Iron powder 58 Silica powder 21 The specific gravity of this molded product is 2.48, and the viscosity is 15000~
It was 20,000 cp and had liquidity. The oxygen index was 45.5.
前記実施例で得られた成形体を使用してテスト
したところ、例えば原子力発電所内の２次格納容
器壁のケーブル貫通部に要求される気密性の保
持、耐燃焼性、ガンマ線遮蔽能、弾性（衝撃など
による気密性低下防止のため）、施工性のすべて
に上記成形体が適合し、しかも燃焼時に有害なガ
スを発生させないことが判つた。 Tests using the molded bodies obtained in the above examples showed that, for example, the airtightness required for the cable penetration part of the secondary containment vessel wall in a nuclear power plant, combustion resistance, gamma ray shielding ability, and elasticity ( It was found that the above-mentioned molded article meets all the requirements for workability (to prevent airtightness from decreasing due to impact, etc.) and does not generate harmful gases when burned.
以上に述べたように、この発明による成形体
は、特にガンマ線の遮蔽を必要とする壁体開口部
への充填やガンマ線遮蔽壁を構築する場合に好適
である。 As described above, the molded article according to the present invention is particularly suitable for filling an opening in a wall that requires gamma ray shielding or for constructing a gamma ray shielding wall.
Claims (1)
150μで充填量55重量％〜60重量％の鉄粉と、粒
度1μ〜70μで充填量20重量％〜25重量％の珪石粉
とを混合して型に流し込んだ後、硬化させて比重
2.3〜2.5としたことを特徴とする耐燃焼性を改良
したガンマ線遮蔽材。1 Two-component RTV silicone rubber with a particle size of 50μ~
Iron powder with a particle size of 150μ and a filling amount of 55% to 60% by weight and silica powder with a particle size of 1μ to 70μ and a filling amount of 20% to 25% by weight are mixed and poured into a mold, and then hardened to determine the specific gravity.
A gamma ray shielding material with improved flame resistance characterized by a resistance of 2.3 to 2.5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9426184A JPS60237397A (en) | 1984-05-11 | 1984-05-11 | Gamma-ray shielding material, combustion resistance thereof is improved |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9426184A JPS60237397A (en) | 1984-05-11 | 1984-05-11 | Gamma-ray shielding material, combustion resistance thereof is improved |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60237397A JPS60237397A (en) | 1985-11-26 |
| JPH0476080B2 true JPH0476080B2 (en) | 1992-12-02 |
Family
ID=14105336
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9426184A Granted JPS60237397A (en) | 1984-05-11 | 1984-05-11 | Gamma-ray shielding material, combustion resistance thereof is improved |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60237397A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0728144B2 (en) * | 1990-09-04 | 1995-03-29 | 国際電気株式会社 | Manufacturing method for small electronic devices |
| JP5341246B1 (en) * | 2012-12-13 | 2013-11-13 | 株式会社スーリエ | A rubber sheet that does not contain a vulcanizing agent intended to be installed on the ground surface or in the ground, and shields radiation emitted from the ground surface around the living environment contaminated with radioactive materials using the rubber sheet, or How to keep radiation dose low |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5796296A (en) * | 1980-12-06 | 1982-06-15 | Mitsubishi Atomic Power Ind | Shielding filler |
-
1984
- 1984-05-11 JP JP9426184A patent/JPS60237397A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5796296A (en) * | 1980-12-06 | 1982-06-15 | Mitsubishi Atomic Power Ind | Shielding filler |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60237397A (en) | 1985-11-26 |
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