JP2861094B2 - Composite material of expanded graphite sheet and cement or mortar and method for producing the same - Google Patents
Composite material of expanded graphite sheet and cement or mortar and method for producing the sameInfo
- Publication number
- JP2861094B2 JP2861094B2 JP1223815A JP22381589A JP2861094B2 JP 2861094 B2 JP2861094 B2 JP 2861094B2 JP 1223815 A JP1223815 A JP 1223815A JP 22381589 A JP22381589 A JP 22381589A JP 2861094 B2 JP2861094 B2 JP 2861094B2
- Authority
- JP
- Japan
- Prior art keywords
- cement
- expanded graphite
- mortar
- graphite sheet
- composite material
- 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
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は、膨張黒鉛シートとセメントとの複合材料ま
たは膨張黒鉛シートとモルタルとの複合材料及びその製
造方法に関する。Description: TECHNICAL FIELD The present invention relates to a composite material of expanded graphite sheet and cement or a composite material of expanded graphite sheet and mortar and a method for producing the same.
（従来の技術） 高層ビルの壁材や電算機関係、医療施設関係の床等
は、有害な電磁波をシールドするために導電性塗料、メ
ッキ材料、導電性樹脂等が広く使用されている。また、
金属繊維をセメント中に混入することなども試みられて
いる。最近は、炭素繊維とセメントとを複合化させたタ
イル、ボード等を使用するケースが増えてきている。(Conventional technology) Conductive paints, plating materials, conductive resins, and the like are widely used for wall materials of high-rise buildings, floors related to computers and medical facilities, and the like to shield harmful electromagnetic waves. Also,
Attempts have been made to mix metal fibers into cement. Recently, the use of tiles, boards and the like in which carbon fiber and cement are combined has been increasing.
しかしながら、炭素繊維は、強アルカリ雰囲気でも強
度などの経時変化がなく、また、セメントとの複合化に
よりセメント硬化体の強度の向上、靭性の付与等がみら
れる。さらに、炭素繊維は電気伝導性が優れているなど
の理由から一部では、セメントやモルタルと複合化し建
材として使用される様になってきた。However, carbon fibers do not change with time, such as strength, even in a strong alkali atmosphere, and the composite with cement improves the strength of the cured cement body and imparts toughness. Further, carbon fibers have come to be combined with cement and mortar and used as building materials in part because of their excellent electrical conductivity.
（発明が解決しようとする課題） 炭素繊維とセメントの複合化は、炭素繊維にセメント
を含浸させて養生させる方法またはチョップドストラン
ド状の炭素繊維及びセメントを予め予備分散複合して、
水、砂を加え型に注型するなどの方法で施工するが、施
工方法が複雑なために価格が割高となり、一般的に普及
するに至っていない。(Problems to be Solved by the Invention) Composite of carbon fiber and cement is carried out by impregnating carbon fiber with cement and curing or by pre-dispersing and compounding chopped strand-like carbon fiber and cement in advance.
Construction is carried out by adding water and sand and casting into a mold. However, since the construction method is complicated, the price is relatively high and it has not been widely used.
本発明は、電磁波シールド特性に優れた、膨張黒鉛シ
ートとセメントとの複合材料または膨張黒鉛シートとモ
ルタルとの複合材料を容易に提供するものである。The present invention easily provides a composite material of expanded graphite sheet and cement or a composite material of expanded graphite sheet and mortar, which has excellent electromagnetic wave shielding properties.
（課題を解決するための手段） 本発明者らは、膨張黒鉛シートが炭素繊維と同等以上
に強アルカリ下でも安定であり、また層方向の電気伝導
性に優れることに着目し、更に種々研究の結果、セメン
トまたはモルタルとの複合を作業性よく行えることを見
出し、本発明を完成するに至った。(Means for Solving the Problems) The present inventors have paid attention to the fact that the expanded graphite sheet is stable even under a strong alkali at least as high as carbon fibers, and has excellent electrical conductivity in the layer direction. As a result, they found that compounding with cement or mortar can be performed with good workability, and completed the present invention.
本発明は、少なくとも一層の膨張黒鉛シートを挟ん
で、セメントまたはモルタルの層を配すると共に該膨張
黒鉛シートに形成された穴にセメントまたはモルタルを
充填してなる膨張黒鉛シートとセメントまたはモルタル
との複合材料及びセメントペーストまたはモルタルの上
に、多数の穴を設けた膨張黒鉛シートを積層し、次いで
前記セメントペーストまたはモルタルを流し込み固化さ
せる膨張黒鉛シートとセメントまたはモルタルとの複合
材料の製造方法に関する。The present invention relates to a method of forming a cement or mortar between an expanded graphite sheet and a cement or mortar in which holes of the expanded graphite sheet are filled with cement or mortar while at least one expanded graphite sheet is sandwiched therebetween. The present invention relates to a method for producing a composite material of an expanded graphite sheet and cement or mortar in which an expanded graphite sheet provided with a large number of holes is laminated on a composite material and cement paste or mortar, and then the cement paste or mortar is poured and solidified.
本発明に用いる膨張黒鉛シートは、特公昭54−33799
号公報に示されるように、天然黒鉛、キッシュ黒鉛等高
度に結晶構造の発達した黒鉛を、濃硫酸と硝酸等の酸化
剤で酸処理して黒鉛層間化合物を生成させ、水洗いして
から急速加熱して得られた膨張黒鉛をプレスまたはロー
ルで成形して得られる。膨張黒鉛シートの板厚は、0.2
〜0.5mmが好ましい。板厚が薄すぎると取扱性が悪くな
る傾向があり、また厚すぎると高価な膨張黒鉛シートを
多量に使用することになり好ましくはない。The expanded graphite sheet used in the present invention is described in JP-B-54-33799.
As shown in the publication, graphite with a highly developed crystal structure, such as natural graphite and quiche graphite, is acid-treated with an oxidizing agent such as concentrated sulfuric acid and nitric acid to generate a graphite intercalation compound, washed with water, and then rapidly heated. The expanded graphite thus obtained is obtained by molding with a press or a roll. The sheet thickness of the expanded graphite sheet is 0.2
~ 0.5 mm is preferred. If the sheet thickness is too thin, the handleability tends to deteriorate, and if it is too thick, a large amount of an expensive expanded graphite sheet is used, which is not preferable.
セメントまたはモルタルと膨張黒鉛シートの複合化
は、膨張黒鉛シートとセメントまたはモルタルとの接着
性を良好にするために、膨張黒鉛シートに小穴を適当な
ピッチで開けることが必要である。When compounding cement or mortar with an expanded graphite sheet, it is necessary to form small holes in the expanded graphite sheet at an appropriate pitch in order to improve the adhesion between the expanded graphite sheet and the cement or mortar.
壁材、床等のタイル、ボードは、予め作製した型枠中
にセメントを水に分散させたセメントペーストまたはセ
メントペーストに砂を入れたモルタルを流し込み、続い
て小穴を形成した膨張黒鉛シートをその上に配置し、更
にその上にセメントペーストまたはモルタルを膨張黒鉛
シートの上及び小穴に流し込み、膨張黒鉛シートとセメ
ントまたはモルタルを複合化させて得られる。For tiles and boards such as wall materials, floors, etc., a cement paste obtained by dispersing cement in water or a mortar containing sand in a cement paste is poured into a prefabricated formwork, followed by an expanded graphite sheet having small holes formed therein. It is obtained by disposing cement paste or mortar on the top of the expanded graphite sheet and into small holes, and compounding the expanded graphite sheet with cement or mortar.
（実施例） 次に本発明の実施例を説明する。(Example) Next, an example of the present invention will be described.
実施例１ マダガスカル産鱗状黒鉛を濃硫酸及び濃硝酸の混酸中
で酸処理し、水洗後900℃に急熱してかさ密度が0.02g/c
m3の膨張黒鉛粒子を得た。Example 1 Scale graphite from Madagascar is treated with an acid in a mixed acid of concentrated sulfuric acid and concentrated nitric acid, washed with water, rapidly heated to 900 ° C., and has a bulk density of 0.02 g / c.
m 3 expanded graphite particles were obtained.
この膨張黒鉛粒子を金型に用いて加工成形し、厚さが
0.2mm、材質密度が1.2g/cm3で50mm角の膨張黒鉛シート
を得た。次いで第１図に示す様に、この膨張黒鉛シート
に直径7mmの穴３を10mmピッチで開ける加工を施した。The expanded graphite particles are processed and molded using a mold, and the thickness is reduced.
An expanded graphite sheet of 0.2 mm, material density of 1.2 g / cm 3 and 50 mm square was obtained. Then, as shown in FIG. 1, the expanded graphite sheet was subjected to a process of forming holes 3 having a diameter of 7 mm at a pitch of 10 mm.
次に、重量で水／セメント比（W/C）40％のポルトラ
ンドセメントペーストを、型枠中に3mmの厚さに流し込
み、続いてその上に穴開け加工した膨張黒鉛シートをお
いた。さらにその上に、前記のポルトランドセメントペ
ーストを3mmの厚さで流し込み、第２図に示す様に膨張
黒鉛シート１の両側にセメント２の硬化物を配すると共
に膨張黒鉛シート１に形成した穴の中にセメント２の硬
化物を充填して全体の厚さが6.2mmの積層体を得た。次
いでこの積層体愛を１日間放置した後、型枠から取り出
し、３週間水中養生してから風乾し、膨張黒鉛シートと
セメントとの複合材料の板を得た。Next, a Portland cement paste having a water / cement ratio (W / C) of 40% by weight was poured into the mold to a thickness of 3 mm, and then a perforated expanded graphite sheet was placed thereon. Further, the above-mentioned Portland cement paste was poured thereon at a thickness of 3 mm, and a cured product of the cement 2 was placed on both sides of the expanded graphite sheet 1 as shown in FIG. The cured product of cement 2 was filled therein to obtain a laminate having an overall thickness of 6.2 mm. Next, the laminate was left for one day, removed from the mold, cured in water for 3 weeks, and air-dried to obtain a board of a composite material of expanded graphite sheet and cement.
実施例２ 実施例１において、W/Cが65％のポルトランドセメン
トペーストに、セメントと同重量の標準砂（直径100μ
ｍ）を入れたモルタルをポルトランドセメントペースト
のかわりに使用し、同様の加工を施して膨張黒鉛シート
とモルタルとの複合材料の板を得た。Example 2 In Example 1, Portland cement paste having a W / C of 65% was mixed with standard sand (100 μm in diameter) of the same weight as the cement.
The mortar containing m) was used in place of the Portland cement paste, and the same processing was performed to obtain a plate of a composite material of the expanded graphite sheet and the mortar.
比較例１ 実施例２において、膨張黒鉛シートを使わずモルタル
単体で板厚6mmのモルタル硬化物の板を得た。Comparative Example 1 In Example 2, a mortar alone having a thickness of 6 mm was obtained as a cured mortar plate without using an expanded graphite sheet.
比較例２ 実施例１において、膨張黒鉛シートを使わずセメント
単体で板厚6mmのセメント硬化物の板を得た。Comparative Example 2 In Example 1, a cement-hardened plate having a plate thickness of 6 mm was obtained using only cement without using an expanded graphite sheet.
実施例１、２及び比較例１、２で得られた板について
電界シールド特性ならびに曲げ強度の測定を行い、その
結果を第１表に示す。The sheets obtained in Examples 1 and 2 and Comparative Examples 1 and 2 were measured for electric field shielding properties and bending strength, and the results are shown in Table 1.
第１表から明らかな様に実施例１、２の板は、電気伝
導性に優れた膨張黒鉛シートをセメントまたはモルタル
に１枚挿入することで100〜1000MHzの広い範囲にわたり
優れた電界シールド特性が得られ、また、セメントにお
いては膨張黒鉛シートを１枚挿入することで、曲げ強度
が膨張黒鉛シートを挿入しないい場合の３倍まで改善さ
れる。As is clear from Table 1, the plates of Examples 1 and 2 have excellent electric field shielding properties over a wide range of 100 to 1000 MHz by inserting one sheet of expanded graphite sheet having excellent electric conductivity into cement or mortar. In addition, in the cement, by inserting one expanded graphite sheet, the bending strength can be improved up to three times that in the case where no expanded graphite sheet is inserted.
（発明の効果） 本発明によれば、セメントまたはモルタルの層の内部
に多数の穴を設けた膨張黒鉛シートを配することで、膨
張黒鉛シートとセメントまたはモルタルとの接着性を高
め、さらに膨張黒鉛シートの優れた電気伝導性を生か
し、広い周波数領域で電磁波シールド効果に優れたセメ
ントまたはモルタルのタイルやボードを容易に提供する
ことができる。 (Effects of the Invention) According to the present invention, by disposing an expanded graphite sheet provided with a large number of holes inside a cement or mortar layer, the adhesiveness between the expanded graphite sheet and the cement or mortar is increased, and further expansion is achieved. Taking advantage of the excellent electrical conductivity of the graphite sheet, it is possible to easily provide a cement or mortar tile or board having an excellent electromagnetic wave shielding effect in a wide frequency range.
第１図は本発明の実施例になる複合材料の平面図、第２
図は第１図のＡ−Ａの断面図である。 符号の説明 １……膨張黒鉛シート、２……セメント（モルタル）、
３……穴FIG. 1 is a plan view of a composite material according to an embodiment of the present invention.
The figure is a sectional view taken along line AA of FIG. DESCRIPTION OF SYMBOLS 1 ... Expanded graphite sheet, 2 ... Cement (mortar),
3 ... hole
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.6，ＤＢ名) B32B 1/00 - 35/00──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. 6 , DB name) B32B 1/00-35/00
Claims (2)
で、セメントまたはモルタルの層を配すると共に該膨張
黒鉛シートに形成された穴にセメントまたはモルタルを
充填してなる膨張黒鉛シートとセメントまたはモルタル
との複合材料。1. An expanded graphite sheet comprising a cement or mortar layer and a cement or mortar layer provided between at least one expanded graphite sheet and a cement or mortar filled with cement or mortar. Composite material.
多数の穴を設けた膨張黒鉛シートを積層し、次いで前記
セメントペーストまたはモルタルを流し込み固化させる
ことを特徴とする膨張黒鉛シートとセメントまたはモル
タルとの複合材料の製造方法。2. On a cement paste or mortar,
A method for producing a composite material of expanded graphite sheet and cement or mortar, comprising laminating expanded graphite sheets provided with a large number of holes, and then pouring and solidifying the cement paste or mortar.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1223815A JP2861094B2 (en) | 1989-08-30 | 1989-08-30 | Composite material of expanded graphite sheet and cement or mortar and method for producing the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1223815A JP2861094B2 (en) | 1989-08-30 | 1989-08-30 | Composite material of expanded graphite sheet and cement or mortar and method for producing the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0386538A JPH0386538A (en) | 1991-04-11 |
| JP2861094B2 true JP2861094B2 (en) | 1999-02-24 |
Family
ID=16804155
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1223815A Expired - Lifetime JP2861094B2 (en) | 1989-08-30 | 1989-08-30 | Composite material of expanded graphite sheet and cement or mortar and method for producing the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2861094B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102007053652A1 (en) * | 2007-11-08 | 2009-05-14 | BAM Bundesanstalt für Materialforschung und -prüfung | Expanded graphite and process for its preparation |
-
1989
- 1989-08-30 JP JP1223815A patent/JP2861094B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0386538A (en) | 1991-04-11 |
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