JPH10330176A - Chemical-resistant pipe and its production - Google Patents

Chemical-resistant pipe and its production

Info

Publication number
JPH10330176A
JPH10330176A JP9140558A JP14055897A JPH10330176A JP H10330176 A JPH10330176 A JP H10330176A JP 9140558 A JP9140558 A JP 9140558A JP 14055897 A JP14055897 A JP 14055897A JP H10330176 A JPH10330176 A JP H10330176A
Authority
JP
Japan
Prior art keywords
cement
chloroprene
chemical
pipe
resistant
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
Application number
JP9140558A
Other languages
Japanese (ja)
Inventor
Yoichi Ichikawa
洋一 市川
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Resonac Kenzai Corp
Original Assignee
Showa Denko Kenzai KK
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Showa Denko Kenzai KK filed Critical Showa Denko Kenzai KK
Priority to JP9140558A priority Critical patent/JPH10330176A/en
Publication of JPH10330176A publication Critical patent/JPH10330176A/en
Pending legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/009—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone characterised by the material treated
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
    • C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
    • C04B41/46—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with organic materials
    • C04B41/48—Macromolecular compounds
    • C04B41/4838—Halogenated polymers
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/20—Resistance against chemical, physical or biological attack
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/56—Compositions suited for fabrication of pipes, e.g. by centrifugal casting, or for coating concrete pipes

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Aftertreatments Of Artificial And Natural Stones (AREA)
  • Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)

Abstract

PROBLEM TO BE SOLVED: To obtain chemical-resistant pipe excellent in liquid-blocking property and having high strength at a low cost, by impregnating and/or covering the inner side of the pipe section formed by cement-based material comprising at least cement, fine aggregate, chloroprene and water with chloroprene. SOLUTION: This chemical-resistant pipe is mainly used as a Hume pipe for civil engineering and construction and is produced according to the following processes: (1) pouring into a rotary molding apparatus cement-type base material such as cement, fine aggregate, etc., with water; (2) further pouring mortar added with cation-type chloroprene latex without unmolding it just as it is and then removing water followed by finishing molding; (3) unmolding to form the pipe section. It is suitable that the ratio of chloroprene to cement is about 3-20 wt.% and the ratio of fine aggregate to cement is about 0-300 wt.%.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【発明の属する技術分野】本発明は、少なくともセメン
ト、細骨、クロロプレン、水、からなるセメント系材料
で成型される管材の内面側からクロロプレンが含浸およ
び／または被覆された耐薬品性管材とその製法に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chemical-resistant tubular material impregnated and / or coated with chloroprene from the inner surface side of a tubular material formed of a cement-based material comprising at least cement, fine bone, chloroprene, and water. Regarding the manufacturing method.

【０００２】[0002]

【従来の技術】耐薬品性ヒューム管は、通常、回転成形
されたヒューム管をオートクレーブなどで高温高圧養
生、乾燥した後、管の内面にエポキシ樹脂やＭＭＡ樹脂
をコーティングして製造される。2. Description of the Related Art A chemical-resistant fume tube is usually manufactured by curing a rotomolded fume tube at a high temperature and a high pressure in an autoclave or the like, drying the tube, and coating an inner surface of the tube with an epoxy resin or an MMA resin.

【０００３】[0003]

【発明が解決しようとする課題】しかし、これらエポキ
シ樹脂やＭＭＡ樹脂は管材の含水率が高いとコーティン
グができない。従って、基本的に管材をオートクレーブ
などで高温高圧養生して、乾燥後にコーティングするこ
とを余儀なくされるため、コーティング工程とそのため
の乾燥工程を必要とする。このため、コーティングする
においては溶剤やモノマーなどの臭気が発生し環境や健
康に悪い。更に、エポキシ樹脂にはセラミック粉末を混
合することで高価になり、またＭＭＡ樹脂モルタルも高
価なのでこれらの方法はコストが高くなる。However, these epoxy resins and MMA resins cannot be coated if the water content of the tube material is high. Therefore, it is basically necessary to cure the tube material at a high temperature and a high pressure in an autoclave or the like and coat it after drying. Therefore, a coating step and a drying step for the coating step are required. Therefore, when coating, odors such as solvents and monomers are generated, which is bad for the environment and health. Furthermore, these methods are expensive because the epoxy resin becomes expensive by mixing ceramic powder, and the MMA resin mortar is also expensive.

【０００４】本発明は上記事情に鑑みてなされたもの
で、従来技術の回転成型法を利用して、少なくともセメ
ント、細骨、クロロプレン、水、からなる上記セメント
系材料で管材を製造することにおいて、コーティング工
程とそのための乾燥工程を必要としないことが可能なた
め製造ラインを停止することなく、全工程を連続して製
造でき、上記管材の内面側からクロロプレンが含浸およ
び／または被覆された耐薬品性管材とその製法を提供す
ることを目的とする。SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and is directed to manufacturing a pipe using at least the cement-based material including cement, fine bone, chloroprene, and water using a conventional rotational molding method. Since the coating process and the drying process therefor are not required, all processes can be continuously performed without stopping the production line, and the chloroprene impregnated and / or coated with chloroprene from the inner surface side of the tube material. An object of the present invention is to provide a chemical tubing and a method for producing the same.

【０００５】[0005]

【課題を解決するための手段】請求項１記載のセメント
系材料の耐薬品性管材は、少なくともセメント、細骨、
クロロプレン、水、からなるセメント系材料で成型され
る管材であって、管材の内面側からクロロプレンが含浸
および／または被覆されたことを特徴とする。請求項２
記載のセメント系材料の耐薬品性管材は、上記請求項１
記載のセメント系材料の耐薬品性管材において、上記耐
薬品性管材の組成は、セメントに対するクロロプレンの
比率が略３〜２０パーセントであり、セメントに対する
細骨の比率が略０〜３００パーセントであることを特徴
とする。請求項３記載のセメント系材料の耐薬品性管材
は、上記請求項１または請求項２記載のセメント系材料
の耐薬品性管材において、上記耐薬品性管材がヒューム
管であることを特徴とする。According to a first aspect of the present invention, there is provided a chemical-resistant tube made of a cement-based material, comprising at least cement, fine bone,
A pipe formed of a cement-based material composed of chloroprene and water, wherein chloroprene is impregnated and / or coated from an inner surface side of the pipe. Claim 2
The above-mentioned chemical-resistant tubing of cement-based material according to claim 1.
In the chemical-resistant tubular material of the cement-based material described above, the composition of the chemical-resistant tubular material is such that a ratio of chloroprene to cement is approximately 3 to 20% and a ratio of fine bone to cement is approximately 0 to 300%. It is characterized by. According to a third aspect of the present invention, there is provided the cement-resistant material of the cement-based material according to the first or second aspect, wherein the chemical-resistant tube is a fume tube. .

【０００６】請求項４に記載のセメント系材料の耐薬品
性管材の製法は、少なくともセメント、細骨、クロロプ
レン、水、からなるセメント系材料を回転成型によって
管材を製造することにおいて、水より大きいクロロプレ
ンラテックスの比重を遠心力が作用する回転成型に利用
して、管材内面側からクロロプレンを含浸および／また
は被覆することを特徴とする。請求項５に記載のセメン
ト系材料の耐薬品性管材の製法は、上記請求項４記載の
セメント系材料の耐薬品性管材の製法において、上記セ
メント系材料の管材内面にクロロプレンポリマーまたは
／およびクロロプレンモルタルの層を形成し、上記セメ
ント系材料の管材の養生過程においてセメント中の金属
酸化物とクロロプレンに起こる架橋反応を利用して管材
内面側からクロロプレンを含浸および／または被覆する
ことを特徴とする。請求項６に記載のセメント系材料の
耐薬品性管材の製法は、上記請求項４または請求項５に
記載のセメント系材料の耐薬品性管材の製法において、
上記耐薬品性管材がヒューム管であることを特徴とす
る。According to a fourth aspect of the present invention, there is provided a method for producing a chemical-resistant pipe made of a cement-based material, wherein the pipe is manufactured by rotational molding of at least a cement-based material comprising cement, fine bone, chloroprene, and water. The specific gravity of chloroprene latex is used for rotational molding in which a centrifugal force acts, and chloroprene is impregnated and / or coated from the inner surface side of the tube. According to a fifth aspect of the present invention, there is provided the method for producing a chemically resistant pipe made of a cement-based material according to the fourth aspect, wherein a chloroprene polymer and / or chloroprene is provided on the inner surface of the cement-based material. A mortar layer is formed, and chloroprene is impregnated and / or coated from the inner side of the pipe material by utilizing a crosslinking reaction that occurs between metal oxide and chloroprene in the cement in the process of curing the pipe material of the cement-based material. . The method for producing a chemical-resistant tube made of a cement-based material according to claim 6 is a method for producing a chemical-resistant tube made of a cement-based material according to claim 4 or 5,
The chemical-resistant tube is a fume tube.

【０００７】[0007]

【発明の実施の形態】本発明のセメント系材料の耐薬品
性管材は土木、建築用のヒューム管として使用されるこ
とが多い。そして、セメント系材料の耐薬品性管材の内
面にエポキシ樹脂とセラミック粉末で塗料を作り、これ
をヒューム管内面にコーティングしたり、ＭＭＡ樹脂系
モルタルでヒューム管内面にコーティングするこれまで
の方法に対し、クロロプレンをヒューム管内面側からの
含浸材および／または被覆材として使用することでこれ
までにない優れたヒューム管を安価に製造することがで
きる。BEST MODE FOR CARRYING OUT THE INVENTION The cement-resistant material of the present invention is often used as a fume pipe for civil engineering and construction. Then, a paint is made with epoxy resin and ceramic powder on the inner surface of the chemical-resistant tube made of cement-based material, and this is coated on the inner surface of the fume tube, or on the previous method of coating the inner surface of the fume tube with MMA resin mortar. By using chloroprene as the impregnating material and / or coating material from the inner surface side of the fume tube, an excellent fume tube, which has never been seen before, can be manufactured at low cost.

【０００８】上記ヒューム管は、管材をオートクレーブ
などで高温高圧養生したり、コーティング工程のための
乾燥工程を要せず、従来からの方法の回転成型を利用し
て連続して製造される。この方法は、回転成型装置にセ
メント、細骨、などのセメント系基材を水と共に流し込
み、回転しながらセメント系基材の表面の水分を除去す
る。その次に、このまま脱型しないでネオメント（カチ
オン系クロロプレンラテックス）を添加したモルタルを
さらに流し込み、これを水分除去して仕上げ成型して、
その後脱型して本発明のセメント系材料の耐薬品性管材
（ヒューム管）を成型する。[0008] The fume tube is manufactured continuously by using a conventional method of rotary molding, without requiring high temperature and high pressure curing of the tube material in an autoclave or the like or a drying process for a coating process. In this method, a cement-based material such as cement, fine bone, or the like is poured into a rotary molding device together with water, and water is removed from the surface of the cement-based material while rotating. Next, mortar to which neoment (cationic chloroprene latex) is added is further poured without removing the mold as it is, and this is subjected to finish molding by removing moisture.
Thereafter, the mold is removed to form the chemical-resistant tube (fume tube) of the cement-based material of the present invention.

【０００９】上記セメント系材料の組成は少なくともセ
メント、細骨（６〜８号の微粒ケイ砂）、クロロプレン
（ネオプレンラテックス）、水からなるが、必要に応じ
て他の材料を混入してもよく、消泡剤が混入されること
が多い。上記組成のセメントに対するクロロプレンの比
率は略３〜２０パーセントが適当であり、セメント系材
料の空隙に含浸されるに十分な量であればよく、それ以
上の量を添加してもそれ以上の効果は期待できない。ま
た、上記組成のセメントに対する細骨の比率は略０〜３
００パーセントが適当であり、細骨量が多すぎるとセメ
ントとクロロプレンの架橋反応が不十分になる。また、
水は成型可能な範囲で必要最小限度の量が望ましいが、
セメントに対する水の比率は略１５〜５０パーセントが
適当であり、回転成型の遠心力の大きさによって適当な
水の添加量を調整することができる。[0009] The composition of the cement-based material comprises at least cement, fine bone (fine-grained silica sand of Nos. 6 to 8), chloroprene (neoprene latex), and water. If necessary, other materials may be mixed. In addition, antifoaming agents are often mixed. The ratio of chloroprene to cement of the above composition is suitably about 3 to 20%, and it is sufficient if it is an amount sufficient to impregnate the voids of the cement-based material. Can not expect. The ratio of the fine bone to the cement having the above composition is approximately 0 to 3
If the amount of fine bone is too large, the crosslinking reaction between cement and chloroprene becomes insufficient. Also,
Water should be in the minimum necessary amount as long as it can be molded,
An appropriate ratio of water to cement is approximately 15 to 50%, and an appropriate amount of water to be added can be adjusted according to the magnitude of centrifugal force of rotational molding.

【００１０】この製造方法で水の比重よりやや大きい比
重（１．２〜１．５）のクロロプレンラテックスを使用
すると、回転成型による遠心力でクロロプレンがセメン
トなどの材料の空隙に充填され、上記管材の全部または
一部に管材内面側から含浸されて密度を高め、遮液性に
優れ、ひいては耐薬品性に優れたモルタル層が形成され
る。尚、この場合は管材内表面にはモルタル層に限らず
クロロプレンポリマーの層が形成されても差支えない。
こうして、クロロプレンを含浸や被覆をすることで従来
からの方法のような乾燥やコーティングを別工程にして
製造ラインを停止することなく、全工程を連続して製造
することができる。When chloroprene latex having a specific gravity (1.2 to 1.5) slightly higher than the specific gravity of water is used in this production method, chloroprene is filled into the voids of a material such as cement by centrifugal force caused by rotational molding. All or a part of the mortar layer is impregnated from the inner surface side of the tube material to increase the density, form a mortar layer having excellent liquid barrier properties, and thus excellent chemical resistance. In this case, not only a mortar layer but also a chloroprene polymer layer may be formed on the inner surface of the tube.
In this way, by impregnating or coating with chloroprene, all processes can be continuously performed without stopping the production line by performing drying and coating as separate processes as in the conventional method.

【００１１】更に、成型後の上記セメント系材料の管材
の養生過程において、セメント中の金属酸化物とクロロ
プレンに起こる架橋反応を利用することで管材内面のモ
ルタルの強度と耐薬品性を一層向上することができる。Further, in the process of curing the pipe material of the cement-based material after molding, the strength and chemical resistance of the mortar on the inner surface of the pipe material are further improved by utilizing a cross-linking reaction occurring between the metal oxide in the cement and chloroprene. be able to.

【００１２】[0012]

【実施例】本発明の一実施例として、消泡剤を混入して
耐薬品性ヒューム管を製造する場合、ポルトランドセメ
ント１０重量部、ケイ砂７号１０重量部、ケイ砂８号１
０重量部、カチオン系クロロプレンエマルジョン３．３
重量部、水３重量部、消泡剤０．０１９重量部を組成と
し、上記記載した手順で回転成型装置にて成型される。
また、消泡剤を混入しない他の実施例では、ポルトラン
ドセメント１０重量部、ケイ砂７号７．５重量部、ケイ
砂８号７．５重量部、カチオン系クロロプレンエマルジ
ョン２．２重量部、水２．２重量部を組成とし、上記回
転成型装置にて成型される。EXAMPLE As one embodiment of the present invention, when a chemical resistant fume tube is manufactured by mixing an antifoaming agent, 10 parts by weight of Portland cement, 10 parts by weight of silica sand 7, and 8 of silica sand 1
0 parts by weight, cationic chloroprene emulsion 3.3
The composition is composed of 3 parts by weight of water, 3 parts by weight of water, and 0.019 parts by weight of an antifoaming agent, and is molded by a rotary molding apparatus according to the procedure described above.
In another example in which the defoaming agent is not mixed, 10 parts by weight of Portland cement, 7.5 parts by weight of silica sand No. 7, 7.5 parts by weight of silica sand 8, 2.2 parts by weight of a cationic chloroprene emulsion, The composition is 2.2 parts by weight of water and is molded by the above-mentioned rotary molding apparatus.

【００１３】[0013]

【発明の効果】請求項１ないし請求頂３記載のセメント
系材料の耐薬品性管材は、ヒューム管のようなセメント
系材料の管材の内面にクロロプレンが含浸および／また
は被覆された構成によって、遮液性に優れ、強度の大き
い耐薬品性管材を安価に提供することができる。請求項
４記載ないし請求項６記載の構成によって、コーティン
グ工程とそのための乾燥工程を必要とせず、ひいては溶
剤やモノマーなどの臭気が発生しないので環境や健康に
よく、従来の技術で実施されてきたコーティングする方
法に比べてコストが安くなる効果を奏する。According to the first to third aspects of the present invention, the chemical-resistant pipe made of cement-based material is shielded by a structure in which chloroprene is impregnated and / or coated on the inner surface of a pipe made of cement-based material such as a fume pipe. It is possible to provide a chemical-resistant tube having excellent liquid properties and high strength at low cost. According to the constitutions of claims 4 to 6, a coating step and a drying step for the step are not required, and since odors such as a solvent and a monomer are not generated, it is good for the environment and health. This has the effect of reducing costs compared to the coating method.

Claims (6)

【特許請求の範囲】[Claims] 【請求項１】 少なくともセメント、細骨、クロロプレ
ン、水、からなるセメント系材科で成型される管材であ
って、管材の内面側からクロロプレンが含浸および／ま
たは被覆されたセメント系材料の耐薬品性管材。1. Chemical resistance of a pipe material molded at least from cement, fine bone, chloroprene, and water in a cement material department, wherein the chloroprene is impregnated and / or coated from the inner surface side of the pipe material. Tubing. 【請求項２】 上記耐薬品性管材の組成は、セメントに
対するクロロプレンの比率が略３〜２０パーセントであ
り、セメントに対する細骨の比率は略０〜３００パーセ
ントである請求項１に記載のセメント系材料の耐薬品性
管材。2. The cement system of claim 1, wherein the composition of the chemical resistant tubing is such that the ratio of chloroprene to cement is about 3 to 20 percent and the ratio of fine bone to cement is about 0 to 300 percent. Material of chemical resistant tubing. 【請求項３】 上記耐薬品性管材がヒューム管である請
求項１または請求項２に記載のセメント系材料の耐薬品
性管材。3. The chemical-resistant tube made of a cement-based material according to claim 1, wherein the chemical-resistant tube is a fume tube. 【請求項４】 少なくともセメント、細骨、クロロプレ
ン、水、からなるセメント系材料を回転成型によって管
材を製造することにおいて、水より大きいクロロプレン
ラテックスの比重を遠心力が作用する回転成型に利用し
て、管材内面側からクロロプレンを含浸および／または
被覆するセメント系材料の耐薬品性管材の製法。4. A method for manufacturing a pipe material by rotational molding of a cement material comprising at least cement, fine bone, chloroprene, and water, wherein a specific gravity of chloroprene latex larger than water is used for rotational molding in which centrifugal force acts. And a method of producing a cement-resistant chemical-resistant pipe material impregnated with and / or coated with chloroprene from the inner side of the pipe material. 【請求項５】 上記セメント系材料の管材内面にクロロ
プレンポリマーまたは／およびクロロプレンモルタルの
層を形成し、上記セメント系材料の管材の養生過程にお
いてセメント中の金属酸化物とクロロプレンに起こる架
橋反応を利用して管材内面にクロロプレンを含浸および
／または被覆する請求項４に記載のセメント系材料の耐
薬品性管材の製法。5. A layer of a chloroprene polymer and / or chloroprene mortar is formed on the inner surface of the pipe of the cement-based material, and a cross-linking reaction occurring between the metal oxide and chloroprene in the cement during the curing of the pipe of the cement-based material is used. The method for producing a chemical-resistant pipe made of a cement-based material according to claim 4, wherein chloroprene is impregnated and / or coated on an inner surface of the pipe. 【請求項６】 上記耐薬品性管材がヒューム管である請
求項４または請求項５に記載のセメント系材料の耐薬品
性管材の製法。6. The method according to claim 4, wherein the chemical-resistant tube is a fume tube.
JP9140558A 1997-05-29 1997-05-29 Chemical-resistant pipe and its production Pending JPH10330176A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP9140558A JPH10330176A (en) 1997-05-29 1997-05-29 Chemical-resistant pipe and its production

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP9140558A JPH10330176A (en) 1997-05-29 1997-05-29 Chemical-resistant pipe and its production

Publications (1)

Publication Number Publication Date
JPH10330176A true JPH10330176A (en) 1998-12-15

Family

ID=15271483

Family Applications (1)

Application Number Title Priority Date Filing Date
JP9140558A Pending JPH10330176A (en) 1997-05-29 1997-05-29 Chemical-resistant pipe and its production

Country Status (1)

Country Link
JP (1) JPH10330176A (en)

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5227418A (en) * 1975-08-28 1977-03-01 Denki Kagaku Kogyo Kk Waterproof agents for coating
JPH01164779A (en) * 1987-12-21 1989-06-28 Lion Corp Formed product of reinforced hydraulic inorganic material
JPH01301307A (en) * 1988-05-31 1989-12-05 Satoshi Kamiguchi Manufacture of concrete pipe with centrifugal force
JPH02162002A (en) * 1988-12-16 1990-06-21 Dainippon Shikizai Kogyo Kk Manufacture of chemical-resistant hume concrete pipe
JPH02217346A (en) * 1989-02-15 1990-08-30 Denki Kagaku Kogyo Kk Lining material and production of lined pipe using same material
JPH03164459A (en) * 1989-11-22 1991-07-16 Denki Kagaku Kogyo Kk Production of lined pipe
JPH03247578A (en) * 1990-02-27 1991-11-05 Denki Kagaku Kogyo Kk Hollow cylindrical pipe
JPH04323005A (en) * 1991-04-23 1992-11-12 Denki Kagaku Kogyo Kk Lined pipe and manufacture thereof

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5227418A (en) * 1975-08-28 1977-03-01 Denki Kagaku Kogyo Kk Waterproof agents for coating
JPH01164779A (en) * 1987-12-21 1989-06-28 Lion Corp Formed product of reinforced hydraulic inorganic material
JPH01301307A (en) * 1988-05-31 1989-12-05 Satoshi Kamiguchi Manufacture of concrete pipe with centrifugal force
JPH02162002A (en) * 1988-12-16 1990-06-21 Dainippon Shikizai Kogyo Kk Manufacture of chemical-resistant hume concrete pipe
JPH02217346A (en) * 1989-02-15 1990-08-30 Denki Kagaku Kogyo Kk Lining material and production of lined pipe using same material
JPH03164459A (en) * 1989-11-22 1991-07-16 Denki Kagaku Kogyo Kk Production of lined pipe
JPH03247578A (en) * 1990-02-27 1991-11-05 Denki Kagaku Kogyo Kk Hollow cylindrical pipe
JPH04323005A (en) * 1991-04-23 1992-11-12 Denki Kagaku Kogyo Kk Lined pipe and manufacture thereof

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