JP3451654B2 - Grounding resistance reducing composition - Google Patents
Grounding resistance reducing compositionInfo
- Publication number
- JP3451654B2 JP3451654B2 JP11761493A JP11761493A JP3451654B2 JP 3451654 B2 JP3451654 B2 JP 3451654B2 JP 11761493 A JP11761493 A JP 11761493A JP 11761493 A JP11761493 A JP 11761493A JP 3451654 B2 JP3451654 B2 JP 3451654B2
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- composition
- ground resistance
- resistance value
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Description
【０００１】[0001]
【産業上の利用分野】本発明は接地抵抗を著しく低減す
るのみならず、抵抗値のばらつきが少なく、長期間にわ
たって抵抗値が小さく安定し、かつ耐久性にも優れた接
地抵抗低減組成物に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ground resistance-reducing composition which not only significantly reduces the ground resistance but also has a small variation in resistance value, a small resistance value over a long period of time, is stable and has excellent durability. .
【０００２】[0002]
【従来の技術】従来、電力施設、通信設備機器等の設備
施工時に接地電極の周辺土壌を処理して接地抵抗の低減
を計る目的で、接地抵抗低減組成物が良く使用されてい
る。2. Description of the Related Art Conventionally, a ground resistance-reducing composition has been often used for the purpose of treating the soil around the ground electrode to reduce the ground resistance at the time of construction of facilities such as electric power facilities and communication equipment.
【０００３】この種の接地抵抗低減組成物として、例え
ば、吸水性樹脂／炭素繊維／半石膏からなるもの（特開
平３−９３１８１号公報参照）、カーボンファイバー
／セメント／水からなるもの（特開平２−２４１２８４
号公報参照）、半水石膏／粘土／導電性塩／スルホン酸
ホルマリン縮合物等からなるもの（特公昭６３−６０５
１１号公報参照）等が提案されている。Examples of the ground resistance reducing composition of this type include, for example, a water absorbent resin / carbon fiber / semi-gypsum (see Japanese Patent Laid-Open No. 3-93181) and carbon fiber.
/ Cement / water (JP-A-2-241284)
(See Japanese Patent Laid-Open No. 63-605), hemihydrate gypsum / clay / conductive salt / formalin sulfonate condensate, etc. (Japanese Patent Publication No. 63-605).
No. 11), etc. have been proposed.
【０００４】これらの公知組成物を大別すると以下のよ
うになる。
(a) 合成樹脂・導電性塩類を主成分とするもの。
(b) セメント類・導電性塩類を主成分とするもの。
(c) 半水石膏を主体とする石膏類・導電性塩類・カーボ
ンまたは、導電金属粉等の導電性助剤を主成分とするも
の。The known compositions are roughly classified as follows. (a) Synthetic resin / conductive salt as a main component. (b) Mainly composed of cements and conductive salts. (c) Gypsum mainly composed of hemihydrate gypsum, conductive salts, carbon, or conductive auxiliary agents such as conductive metal powder as a main component.
【０００５】[0005]
【発明が解決しようとする課題】一般に、接地抵抗低減
組成物は屋外において前述のとおり、通信設備機器等の
設置施工の際のアース取りに使用される場合が多く、そ
の使用量も多いため環境への影響も考慮する必要があ
る。このため、上記(a) の接地抵抗低減組成物では、有
機物が合成樹脂から地中へ溶け出し、環境汚染の問題を
起こす。また、大量使用によりコスト高になったり等の
問題も生じる。Generally, as described above, the ground resistance reducing composition is often used outdoors for grounding when installing and constructing communication equipment, etc. It is necessary to consider the impact on Therefore, in the ground resistance reducing composition of the above (a), organic matter is dissolved from the synthetic resin into the ground, causing a problem of environmental pollution. In addition, the use of a large amount causes a problem such as an increase in cost.
【０００６】また、前記(b) の接地抵抗低減組成物は接
地電極の腐食が起きやすいため、時間の経過より次第に
抵抗値が上昇するといった問題点があった。また、接地
抵抗値自体もそれ程良好とはいえなかった。Further, the ground resistance-reducing composition (b) has a problem that the ground electrode is apt to corrode, so that the resistance value gradually increases over time. Also, the ground resistance value itself was not so good.
【０００７】これら (a)、(b) の問題点を解決するため
前記(c) の接地抵抗低減組成物が提案されている。しか
し、この場合でも完全には接地電極の腐食を防止するこ
とができず、長期間の耐久性を有するには至っておら
ず、さらに接地抵抗値を小さく、かつ長期間にわたって
安定的に維持することができない。In order to solve the problems (a) and (b), the ground resistance reducing composition (c) has been proposed. However, even in this case, it is not possible to completely prevent the corrosion of the ground electrode, and it has not yet achieved long-term durability.In addition, the ground resistance value must be small and it must be stably maintained for a long time. I can't.
【０００８】そこで、本発明の目的は接地抵抗を著しく
低減するのみならず、抵抗値のばらつきが少なく、長期
間にわたって抵抗値が小さく安定し、かつ耐久性にも優
れ、前述の公知技術に存する欠点を改良した接地抵抗低
減組成物を提供することにある。Therefore, the object of the present invention is not only to significantly reduce the ground resistance, but also to reduce the variation in resistance value, to keep the resistance value small and stable over a long period of time, and to have excellent durability. It is an object of the present invention to provide a ground resistance-reducing composition with improved drawbacks.
【０００９】[0009]
【課題を解決するための手段】前述の目的を達成するた
め、本発明によれば、半水石膏１００重量部と、導電性
塩５〜５０重量部と、下記群から選択される１種以上の
保水剤０．１〜１５重量部と、金属腐食防止剤０．００
１〜０．５重量部と、グラファイト及び／またはカーボ
ン５〜５０重量部とを主成分として含有してなる接地抵
抗低減組成物とした。
群
デンプン、カンテン、セルロース、ポリアクリル酸系ポ
リマー、ポリビニルアルコール系ポリマー、ポリオキシ
エチレン系ポリマー、ポリアクリルアミド系ポリマー
これにより接地電極の腐食を長期間防止するとともに、
接地抵抗を極めて低く、かつ長期間にわたって小さく安
定化することができる。In order to achieve the above object, according to the present invention, 100 parts by weight of gypsum hemihydrate, 5 to 50 parts by weight of conductive salt, and one or more selected from the following group 0.1 to 15 parts by weight of water retention agent and 0.00 of metal corrosion inhibitor
A ground resistance-reducing composition containing 1 to 0.5 parts by weight and 5 to 50 parts by weight of graphite and / or carbon as main components. Group starch, agar, cellulose, polyacrylic acid-based polymer, polyvinyl alcohol-based polymer, polyoxyethylene-based polymer, polyacrylamide-based polymer This prevents corrosion of the ground electrode for a long time,
The ground resistance can be extremely low, and can be kept small and stable for a long period of time.
【００１０】[0010]
【発明の具体的説明】本発明に用いられる半水石膏は、
１／２Ｈ2 Ｏを結晶水として含有する石膏であり、無水
石膏と比して反応性に富み、しかも含水性のため導電性
も良い。この他にα石膏等があるが、価格が高く経済的
にも半水石膏の方が好ましい。DETAILED DESCRIPTION OF THE INVENTION The hemihydrate gypsum used in the present invention is
Gypsum containing 1 / 2H 2 O as water of crystallization, which is more reactive than anhydrous gypsum and has good conductivity because it contains water. In addition to these, there are α-gypsum and the like, but hemihydrate gypsum is preferable from the economical viewpoint because of its high price.
【００１１】前述の導電性塩は本発明では特に限定され
ず、例えば、塩化カリウム（ＫＣｌ）、塩化ナトリウム
（ＮａＣｌ）、塩化カルシウム（ＣａＣｌ2)、硝酸カリ
ウム（ＫＮＯ3)、硝酸ナトリウム（ＮａＮＯ3)、硫酸カ
リウム（Ｋ2 ＳＯ4)、硫酸ナトリウム（Ｎａ2 ＳＯ4)、
硫酸カルシウム（ＣａＳＯ4)、炭酸水素ナトリウム（Ｎ
ａＨＣＯ3)、水溶性塩類等が挙げられ、さらにその他に
も水酸化カルシウム（Ｃａ（ＯＨ)2) 、炭酸カルシウム
（ＣａＣＯ3)、水酸化アルミニウム（Ａｌ（ＯＨ)3) 等
が挙げられる。The above-mentioned conductive salt is not particularly limited in the present invention. For example, potassium chloride (KCl), sodium chloride (NaCl), calcium chloride (CaCl 2 ), potassium nitrate (KNO 3 ), sodium nitrate (NaNO 3 ). , Potassium sulfate (K 2 SO 4 ), sodium sulfate (Na 2 SO 4 ),
Calcium sulfate (CaSO 4 ), sodium hydrogen carbonate (N
aHCO 3 ), water-soluble salts, and the like, and calcium hydroxide (Ca (OH) 2 ), calcium carbonate (CaCO 3 ), aluminum hydroxide (Al (OH) 3 ), and the like.
【００１２】これら導電性塩の添加量は半水石膏１00重
量部に対して、５〜50重量部、好ましくは10〜40重量部
である。これが５重量部以下では導電性が低下し、50重
量部以上では、半水石膏の硬化を阻害するので好ましく
ない。The amount of these conductive salts added is 5 to 50 parts by weight, preferably 10 to 40 parts by weight, based on 100 parts by weight of hemihydrate gypsum. If it is less than 5 parts by weight, the conductivity will be lowered, and if it is more than 50 parts by weight, the setting of hemihydrate gypsum will be hindered, which is not preferable.
【００１３】本発明に用いられる上述保水剤としては、
水を吸収して比較的長時間保持できるものが好ましく使
用できる。具体的には、天然物質では、デンプン・カン
テン・セルロースのような繊維物質、合成物質では、ポ
リアクリル酸系ポリマー、ポリビニルアルコール系ポリ
マー、ポリオキシエチレン系ポリマー、ポリアクリルア
ミド系ポリマー等が挙げられるが、これに限られるもの
ではない。また、前記保水剤は、接地抵抗低減剤自体が
通常アルカリ性を示すため、アルカリ性でも水分を吸収
して保持できるような物質がさらに好ましい。さらに、
上述の保水剤は一般に粉末状で電気的には絶縁性を示す
ため、その添加量は自ずと限定される。すなわち、多く
配合すると吸収性は上がるが導電性が低下し、少ないと
保持できる水の量が少なくなり抵抗値の変動が大きくな
る。このような保水剤の本発明に適した添加量は、組成
物中の半水石膏１00重量部に対して、０.1〜15重量部で
あり、好ましくは１〜５重量部である。吸水性物質の種
類によってはこの範囲を逸脱するものもある。（好まし
くは１〜５％）The above water retention agent used in the present invention includes:
Those that can absorb water and retain it for a relatively long time can be preferably used. Specific examples include natural substances such as fiber materials such as starch, agar, and cellulose, and synthetic substances such as polyacrylic acid-based polymers, polyvinyl alcohol-based polymers, polyoxyethylene-based polymers, and polyacrylamide-based polymers. , But is not limited to this. The water retention agent is more preferably a substance capable of absorbing and retaining water even if it is alkaline, since the ground resistance reducing agent itself usually exhibits alkalinity. further,
Since the above-mentioned water retention agent is generally in the form of powder and electrically insulating, its addition amount is naturally limited. That is, if a large amount is blended, the absorptivity is increased, but the conductivity is lowered, and if the amount is small, the amount of water that can be held is reduced and the fluctuation of the resistance value becomes large. The addition amount of such a water retention agent suitable for the present invention is 0.1 to 15 parts by weight, preferably 1 to 5 parts by weight, based on 100 parts by weight of hemihydrate gypsum in the composition. Depending on the type of water-absorbing substance, there are some that deviate from this range. (Preferably 1-5%)
【００１４】さらに、本発明は金属銅等から構成される
接地電極を腐食から防止するために、金属腐食防止剤を
添加する。この金属腐食防止剤はリン化合物、イオウ化
合物、ニトロン化合物等が挙げられ、具体的にはイミダ
ゾール化合物、有機硫黄化合物、アミンの高級脂肪酸
塩、石油スルホン酸塩、高級アルコール燐酸エステル、
亜硝酸塩、安息香酸ソーダ等であるが、この中で特にベ
ンゾトリアゾールは防錆効果が顕著で導電性に悪影響を
与えないため好ましい。Further, in the present invention, a metal corrosion inhibitor is added in order to prevent the ground electrode composed of metallic copper or the like from corrosion. Examples of the metal corrosion inhibitor include phosphorus compounds, sulfur compounds, nitrone compounds, and the like. Specifically, imidazole compounds, organic sulfur compounds, higher fatty acid salts of amines, petroleum sulfonates, higher alcohol phosphates,
Among these, nitrite and sodium benzoate are preferable, and among them, benzotriazole is particularly preferable because it has a remarkable rust preventive effect and does not adversely affect conductivity.
【００１５】この添加量（含有量）は半水石膏１00重量
部に対して少なくとも０.001重量部、好ましくは 0.001
〜０.5重量部である。０.001重量部以下では防錆効果が
発揮されず、また、あまり多すぎると（例えば、０.5重
量部以上）、導電性に悪影響を及ぼす。The amount of addition (content) is at least 0.001 part by weight, preferably 0.001 part by weight per 100 parts by weight of gypsum hemihydrate.
~ 0.5 parts by weight. If it is less than 0.001 part by weight, the rust preventive effect is not exhibited, and if it is too much (for example, 0.5 part by weight or more), the conductivity is adversely affected.
【００１６】さらに、本発明は導電性助剤としてグラフ
ァイトおよび／またはカーボンを添加することもでき
る。ここで用いられるグラファイトは鱗片状の黒鉛であ
る。このグラファイトは本発明の導電性をさらに向上さ
せる目的で使用され、前記導電性塩との併用によって優
れた導電性を発揮する。Further, in the present invention, graphite and / or carbon may be added as a conductive auxiliary agent. The graphite used here is flaky graphite. This graphite is used for the purpose of further improving the conductivity of the present invention, and exhibits excellent conductivity when used in combination with the above-mentioned conductive salt.
【００１７】このグラファイトの含有量は、半水石膏１
00重量部に対して５〜50重量部であり、好ましくは５〜
30重量部である。この添加量は多ければ多いほど導電性
は高まるため、添加量を多くした方が導電性の面からは
好ましいが、組成物自体の粘度上昇等から生じる作業性
の問題、および添加量の増加によるコストアップを考え
ると、５〜30重量が好ましい。The content of this graphite is 1 gypsum hemihydrate.
5 to 50 parts by weight, preferably 5 to 50 parts by weight
30 parts by weight. Since the higher the amount added, the higher the conductivity, the higher the amount added, the more preferable it is from the viewpoint of conductivity. However, due to the problem of workability caused by the increase in the viscosity of the composition itself, and the increase in the amount added. Considering cost increase, 5 to 30 weight is preferable.
【００１８】本発明組成物では、上述の金属腐食防止
剤、およびグラファイトおよび／またはカーボンを併用
して含有せしめることもできる。この含有量は前記半水
石膏１00重量部に対して、それぞれ、金属腐食防止剤、
少なくとも0.0001重量部およびグラファイトおよび／ま
たはカーボン１〜50重量部である。The composition of the present invention may contain the above-mentioned metal corrosion inhibitor and graphite and / or carbon in combination. This content is 100 parts by weight of the hemihydrate gypsum, respectively, a metal corrosion inhibitor,
At least 0.0001 parts by weight and 1-50 parts by weight of graphite and / or carbon.
【００１９】さらに、本発明組成物は必要に応じて適当
量の水を添加する。これは半水石膏を硬化させるため
で、半水石膏１00重量部に対して30〜２00重量部程度の
量が好ましい。この量は組成物の硬化速度や硬化物の強
靱さ等の物性に悪影響を及ぼさない程度であれば、作業
性を考えて組成物の粘度を調整するため前記範囲外の量
であってもかまわない。Further, to the composition of the present invention, an appropriate amount of water is added if necessary. This is for hardening the hemihydrate gypsum, and the amount is preferably about 30 to 200 parts by weight with respect to 100 parts by weight of hemihydrate gypsum. This amount may be outside the above range in order to adjust the viscosity of the composition in consideration of workability as long as it does not adversely affect the physical properties such as the curing speed of the composition and the toughness of the cured product. Absent.
【００２０】[0020]
【作用】接地抵抗の安定性は半水石膏と、導電性塩と、
カーボンを主成分とした公知の組成物では水分の減少に
伴い硬化物の抵抗値が高くなる傾向を示す。一旦高くな
った硬化物の抵抗値は、その後水を加えても低下するこ
とはない。ところが本発明の組成物では、雨水等の減少
により地中の水分が減少しても、保水剤の存在により、
水が蓄えられているため、急激な乾燥に対しても安定し
た抵抗値を示す。また、長期間の乾燥が続いても、保水
剤に蓄えられた水が徐々に失われていくため、急激な抵
抗値の上昇を起こすことがない。さらに、この間に雨等
により硬化物中の含水率が上昇すると、再び抵抗値が減
少し、これを繰り返すことにより安定した抵抗値を維持
する。[Operation] The stability of ground resistance is that hemihydrate gypsum, conductive salt,
Known compositions containing carbon as a main component tend to increase the resistance value of the cured product as the water content decreases. The resistance value of the cured product once increased does not decrease even if water is added thereafter. However, in the composition of the present invention, even if the water content in the ground decreases due to the reduction of rainwater, etc., due to the presence of the water retention agent,
Since it stores water, it shows a stable resistance value against sudden drying. Further, even if the drying is continued for a long period of time, the water stored in the water retention agent is gradually lost, so that the resistance value does not suddenly increase. Furthermore, if the water content in the cured product increases due to rain or the like during this period, the resistance value decreases again, and by repeating this, a stable resistance value is maintained.
【００２１】また、グラファイトは鱗片状の黒鉛からな
り、フレーク状（ウロコ状）の層を有しており、これら
層間に水分が保持されるため、導電性助剤としてグラフ
ァイトを使用すると、保水剤の効果を合わせもつため、
さらに好ましい。Further, graphite is made of flaky graphite and has flaky (scaly) layers. Since moisture is retained between these layers, if graphite is used as a conductive auxiliary agent, a water retention agent is used. To combine the effects of
More preferable.
【００２２】さらに、本発明組成物では金属腐食防止剤
の存在により、接地電極の腐食を防止し、長期間の耐久
性を保有する。Further, in the composition of the present invention, the presence of the metal corrosion inhibitor prevents the ground electrode from being corroded and has long-term durability.
【００２３】[0023]
【実施例】 以下、本発明を実施例により詳述する。表
１に示す配合の参考例１〜３、実施例１〜３および比較
例１〜２の各試料を調整した。EXAMPLES The present invention will be described in detail below with reference to examples. Samples of Reference Examples 1 to 3, Examples 1 to 3 and Comparative Examples 1 and 2 having the formulations shown in Table 1 were prepared.
【００２４】[0024]
【表１】 [Table 1]
【００２５】表１に示す各試料について接地抵抗を測定
した。測定は次のようにして行なった。まず、高圧送電
線の鉄塔（４脚）の周辺に直径20cm深さ１.2ｍの穴を堀
り、鉄塔の脚１本当り1 つの接地棒( アース棒直径８mm
長さ１ｍの銅製）を計４本敷設する。次に表１に示す各
配合物を調整し、前記接地棒の周囲に最下部から１ｍの
高さまで流し込み、１時間放置し、硬化させたのち、残
りの部分に土を盛って作業を終了した。各配合物の経時
接地抵抗値を測定し、結果を表２に示した。なお、表１
の配合物を用いずに、接地棒のみを土壌に埋設した場合
の接地抵抗は、８ｋΩ〜10ｋΩであった。The ground resistance of each sample shown in Table 1 was measured. The measurement was performed as follows. First, a hole with a diameter of 20 cm and a depth of 1.2 m was dug around the steel tower (four legs) of the high-voltage power transmission line, and one ground rod (one ground rod diameter 8 mm) for each steel tower leg.
4 pieces of 1m long copper) are laid. Next, each composition shown in Table 1 was adjusted, poured from the lowermost part to a height of 1 m around the grounding rod, left for 1 hour to cure, and then soiled on the remaining part to finish the work. . The time-dependent ground resistance value of each formulation was measured, and the results are shown in Table 2. In addition, Table 1
The ground resistance was 8 kΩ to 10 kΩ when the grounding rod alone was buried in the soil without using the compound of (1).
【００２６】[0026]
【表２】 [Table 2]
【００２７】表２から次のことがわかる。
１ 参考例１は導電性助剤および金属腐食防止剤が入っ
ていないため、全体的に抵抗値が高くまた、時間の経過
とともに抵抗値が高くなる。
２ 参考例２は導電性助剤が入っていないため、全体的
に抵抗値が高い。ただし、金属腐食防止剤の影響により
抵抗値の経時変化が少ない。
３ 参考例３は導電性助剤が入っているため、全体的に
抵抗値が低いが、金属腐食防止剤が添加されていないた
め経時変化とともに抵抗値が上昇する傾向にある。
４ 比較例１は保水剤が添加されていないため抵抗値の
変動が大きい。
５ 比較例２は導電塩にかわり従来のセメントを使用し
ての例であるが、初期抵抗値も大きくしかも時間の経過
とともに著しく抵抗値が上昇する。
６ 実施例１〜３はどれをとっても従来の接地抵抗低減
組成物と比較して接地抵抗の低減効果が大きい。The following can be seen from Table 2. 1 In Reference Example 1, the conductive auxiliary agent and the metal corrosion inhibitor are not contained, so that the resistance value is high as a whole and the resistance value increases with the passage of time. 2 Since Reference Example 2 contains no conductive auxiliary agent, the resistance value is high as a whole. However, resistance changes little over time due to the influence of the metal corrosion inhibitor. 3 In Reference Example 3, since the conductive additive is contained, the resistance value is low as a whole, but since the metal corrosion inhibitor is not added, the resistance value tends to increase with time. 4 In Comparative Example 1, since the water retention agent was not added, the resistance value changed greatly. 5 Comparative Example 2 is an example in which a conventional cement is used instead of the conductive salt, but the initial resistance value is large and the resistance value remarkably increases with the passage of time. 6 Examples 1 to 3 has a large effect of reducing the ground resistance as compared to No matter which conventional grounding resistance reducing composition.
【００２８】[0028]
【発明の効果】以上のとおり、本発明組成物は接地抵抗
を著しく低減するのみならず、抵抗値のばらつきが少な
くて長期間にわたって抵抗値が小さく安定し、かつ耐久
性にも優れている。INDUSTRIAL APPLICABILITY As described above, the composition of the present invention not only remarkably reduces the ground resistance, but also has a small variation in resistance value, a small resistance value over a long period of time, is stable, and is excellent in durability.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭56−126283（ＪＰ，Ａ) 特開 昭49−119877（ＪＰ，Ａ) 特開 昭56−42975（ＪＰ，Ａ) 特開 昭54−120853（ＪＰ，Ａ) 特開 昭64−10581（ＪＰ，Ａ) 特開 昭56−878（ＪＰ，Ａ) 特開 昭53−142942（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) H01R 43/00 H01R 13/66 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-56-126283 (JP, A) JP-A-49-119877 (JP, A) JP-A-56-42975 (JP, A) JP-A-54- 120853 (JP, A) JP 64-10581 (JP, A) JP 56-878 (JP, A) JP 53-142942 (JP, A) (58) Fields investigated (Int.Cl. 7 , DB name) H01R 43/00 H01R 13/66
Claims (4)
５０重量部と、下記群から選択される１種以上の保水剤
０．１〜１５重量部と、金属腐食防止剤０．００１〜
０．５重量部と、グラファイト及び／またはカーボン５
〜５０重量部とを主成分として含有してなる接地抵抗低
減組成物。 群 デンプン、カンテン、セルロース、ポリアクリル酸系ポ
リマー、ポリビニルアルコール系ポリマー、ポリオキシ
エチレン系ポリマー、ポリアクリルアミド系ポリマー1. 100 parts by weight of hemihydrate gypsum and 5 to 5 conductive salts
50 parts by weight, 0.1 to 15 parts by weight of one or more water retention agents selected from the following groups, and 0.001 to metal corrosion inhibitor
0.5 parts by weight and graphite and / or carbon 5
A ground resistance-reducing composition containing 50 parts by weight as a main component. Group starch, agar, cellulose, polyacrylic acid-based polymer, polyvinyl alcohol-based polymer, polyoxyethylene-based polymer, polyacrylamide-based polymer
記半水石膏１00重量部に対して少なくとも0.0001重量部
以上含有せしめる請求項１の接地抵抗低減組成物。2. The ground resistance reducing composition according to claim 1, wherein the composition further contains a metal corrosion inhibitor in an amount of at least 0.0001 parts by weight based on 100 parts by weight of the hemihydrate gypsum.
および／またはカーボンを前記半水石膏１00重量部に対
して１〜50重量部含有せしめる請求項１の接地抵抗低減
組成物。3. The ground resistance reducing composition according to claim 1, further comprising 1 to 50 parts by weight of graphite and / or carbon of the composition of claim 1 with respect to 100 parts by weight of said hemihydrate gypsum.
よびグラファイトおよび／またはカーボンを半水石膏１
00重量部に対して、それぞれ、少なくとも0.0001重量部
以上および１〜50重量部併せて含有せしめる請求項１の
接地抵抗低減組成物。4. A hemihydrate gypsum 1 containing the composition of claim 1 with a metal corrosion inhibitor, and graphite and / or carbon.
The composition for reducing ground resistance according to claim 1, which is contained in an amount of at least 0.0001 parts by weight or more and 1 to 50 parts by weight with respect to 00 parts by weight, respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11761493A JP3451654B2 (en) | 1993-04-22 | 1993-04-22 | Grounding resistance reducing composition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11761493A JP3451654B2 (en) | 1993-04-22 | 1993-04-22 | Grounding resistance reducing composition |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06310244A JPH06310244A (en) | 1994-11-04 |
| JP3451654B2 true JP3451654B2 (en) | 2003-09-29 |
Family
ID=14716118
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11761493A Expired - Fee Related JP3451654B2 (en) | 1993-04-22 | 1993-04-22 | Grounding resistance reducing composition |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3451654B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4651342B2 (en) * | 2004-09-24 | 2011-03-16 | 日本高圧電気株式会社 | Grounding resistance reducing material and its construction method |
| CN106205769A (en) * | 2016-06-27 | 2016-12-07 | 国网辽宁省电力有限公司电力科学研究院 | A kind of novel high polymer skeleton friction reducer |
-
1993
- 1993-04-22 JP JP11761493A patent/JP3451654B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06310244A (en) | 1994-11-04 |
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