JP3067811B2 - Water reducing agent for gypsum slurry - Google Patents
Water reducing agent for gypsum slurryInfo
- Publication number
- JP3067811B2 JP3067811B2 JP2409127A JP40912790A JP3067811B2 JP 3067811 B2 JP3067811 B2 JP 3067811B2 JP 2409127 A JP2409127 A JP 2409127A JP 40912790 A JP40912790 A JP 40912790A JP 3067811 B2 JP3067811 B2 JP 3067811B2
- Authority
- JP
- Japan
- Prior art keywords
- water reducing
- reducing agent
- gypsum
- water
- added
- 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 - Fee Related
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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/16—Sulfur-containing compounds
- C04B24/20—Sulfonated aromatic compounds
- C04B24/22—Condensation or polymerisation products thereof
- C04B24/223—Sulfonated melamine-formaldehyde condensation products
-
- 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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/14—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
-
- 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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/30—Water reducers, plasticisers, air-entrainers, flow improvers
- C04B2103/302—Water reducers
-
- 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
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00612—Uses not provided for elsewhere in C04B2111/00 as one or more layers of a layered structure
- C04B2111/0062—Gypsum-paper board like materials
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は石膏又は石膏配合物の減
水剤に関するものでであり、更に詳しくは水硬性石膏配
合物である石膏ボードの製造時に於いて石膏スラリーの
流動性を改善し、更にには添加した起泡剤による泡沫を
安定化し得る石膏スラリー用減水剤に関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water reducing agent for gypsum or a gypsum composition, and more particularly, to an improvement in the flowability of a gypsum slurry in the production of gypsum board which is a hydraulic gypsum composition. Further, the present invention relates to a water reducing agent for gypsum slurry capable of stabilizing foam by an added foaming agent.
【０００２】[0002]
【従来の技術】従来、石膏成形体は無機材料として、各
種用途に用いられているが、なかでも石膏ボード等の建
築材料としての用途が多い。半水石膏、水、混和剤
（材）を配合してなる石膏ボード製造時に於いて半水石
膏／水スラリーの流動性を高めると共に乾燥エネルギー
低減の目的でナフタレンスルホン酸ホルムアルデヒド高
縮合物系又はリグニンスルホン酸系減水剤が使用されて
いる。2. Description of the Related Art Conventionally, gypsum molded articles have been used as inorganic materials for various applications. Among them, gypsum molded articles are often used as building materials such as gypsum boards. In the production of gypsum board containing gypsum hemihydrate, water and an admixture (material), a naphthalenesulfonic acid formaldehyde polycondensate or lignin is used for the purpose of increasing the fluidity of the gypsum hemihydrate / water slurry and reducing drying energy. Sulfonic acid-based water reducing agents are used.
【０００３】しかしながらナフタレンスルホン酸ホルム
アルデヒド高縮合物系減水剤は軽量化の目的で添加した
起泡剤による泡沫を消泡させ、起泡剤の添加量を増加さ
せるという問題点がある。更にリグニンスルホン酸系減
水剤はスラリーの凝結時間を遅らせ、凝結促進剤の添加
量を増加させるという問題点がある。[0003] However, the naphthalenesulfonic acid formaldehyde high condensate-based water reducing agent has a problem in that the foam caused by the foaming agent added for the purpose of weight reduction is defoamed, and the amount of the foaming agent added is increased. Further, the lignin sulfonic acid type water reducing agent has a problem that the setting time of the slurry is delayed and the amount of the setting accelerator added is increased.
【０００４】[0004]
【発明が解決しようとする課題】石膏ボードは、半水石
膏に水、補強材として繊維質物質、軽量化剤として例え
ばポリオキシエチレンアルキルエーテルサルフェート、
アルキルベンゼンスルホン酸塩等の界面活性剤の希釈溶
液を発泡機により泡沫化し添加している。更にスラリー
の凝結時間を促進させる為に硫酸カリウム等が添加され
ている。この配合物に含まれる多量の水を除去する為に
石膏スラリーが硬化後、乾燥機にて乾燥される。この乾
燥エネルギーを節減する目的で一般に減水剤が使用され
ている。使用されている減水剤としては、ナフタレンス
ルホン酸ホルムアルデヒド高縮合物系減水剤及びリグニ
ンスルホン酸系減水剤等がある。前記減水剤はスラリー
の減水性が大であり、凝結遅延作用もなく優れた減水剤
であるが、唯一の欠点は起泡剤により添加した泡沫を消
泡させ、結果として起泡剤の添加量が増加する事であ
る。リグニンスルホン酸系減水剤の欠点は凝結遅延作用
がある事である。凝結遅延作用は凝結促進剤の添加量の
増加、及び多量添加による大幅な減水作用が期待できな
い等の問題点がある。The gypsum board is prepared by adding water to hemihydrate gypsum, a fibrous substance as a reinforcing material, and polyoxyethylene alkyl ether sulfate as a lightening agent.
A diluted solution of a surfactant such as an alkylbenzene sulfonate is foamed by a foaming machine and added. Further, potassium sulfate or the like is added to accelerate the setting time of the slurry. After the gypsum slurry is hardened in order to remove a large amount of water contained in this composition, it is dried in a dryer. A water reducing agent is generally used for the purpose of saving the drying energy. Examples of the water reducing agent used include a naphthalene sulfonic acid formaldehyde high condensate-based water reducing agent and a lignin sulfonic acid-based water reducing agent. The water reducing agent is an excellent water reducing agent which has a large water-reducing property of the slurry and has no setting delay effect, but the only disadvantage is that the foam added by the foaming agent is defoamed, and as a result, the amount of the foaming agent added Is to increase. A disadvantage of lignin sulfonic acid type water reducing agents is that they have a setting retarding effect. The setting retardation has problems such as an increase in the amount of the setting accelerator added, and a large water addition effect cannot be expected due to the addition of a large amount.
【０００５】[0005]
【課題を解決するための手段】本発明者等は、上記の欠
点がない減水剤、即ち半水石膏スラリーの流動性を高め
ると共に凝結時間を遅延させず、更には添加した泡沫を
消泡させない様な減水剤を鋭意検討した結果、フェノー
ルとホルムアルデヒド付加縮合可能な１種又は２種以上
のモノマーとフェノール又はアルキルフェノールのホル
ムアルデヒド共縮合物を必須成分とする減水剤が、上記
問題点を解決する優れた減水剤である事を見出し本発明
を完成した。SUMMARY OF THE INVENTION The present inventors have found that a water reducing agent which does not have the above-mentioned disadvantages, that is, it increases the flowability of a hemihydrate gypsum slurry, does not delay the setting time, and does not defoam the added foam. As a result of intensive studies on such water reducing agents, a water reducing agent comprising as an essential component a formaldehyde cocondensate of one or more monomers capable of addition condensation with phenol and formaldehyde and a formaldehyde co-condensate of phenol or alkyl phenol is excellent in solving the above problems. The present invention was completed by finding that it was a water reducing agent.
【０００６】フェノールとホルムアルデヒド付加縮合可
能なモノマーとしては、フェノールスルホン酸、スルフ
ァニル酸（アニリンスルホン酸）、メラミン、メラミン
スルホン酸、尿素等がある。これらモノマーの１種又は
２種以上を組合わせてホルムアルデヒド共縮合物を製造
し、石膏スラリーの物性に及ぼす影響を種々検討した結
果、以下に示す式（Ａ）、式（Ｂ）、及び式（Ｃ）の化
合物からなる三成分のホルムアルデヒド付加共縮合物よ
りなる減水剤が上記問題点を解決するのに、特に優れた
減水剤であることを見出した。[0006] Monomers capable of formaldehyde addition condensation with phenol include phenolsulfonic acid, sulfanilic acid (anilinesulfonic acid), melamine, melaminesulfonic acid, urea and the like. Formaldehyde cocondensates were produced by combining one or more of these monomers, and various effects on the physical properties of the gypsum slurry were examined. As a result, the following formulas (A), (B), and ( It has been found that a water reducer comprising a ternary formaldehyde addition cocondensate comprising the compound (C) is a particularly excellent water reducer for solving the above problems.
【０００７】[0007]
【化４】 Embedded image
【０００８】[0008]
【化５】 Embedded image
【０００９】[0009]
【化６】 Embedded image
【００１０】式（Ａ）中のＲは、水素又は低級アルキル
基を意味する。低級アルキル基としては、メチル、エチ
ル、プロピル、イソプロピル、ブチル、ペンチル、及び
ヘキシル等の炭素原子１個乃至６個を有する直鎖又は分
岐鎖アルキルが好ましい。式（Ｂ）は、アニリンスルホ
ン酸（スルファニル酸）又はそのアルカリ塩であり、ア
ルカリ塩としては特に限定するものではないが、ナトリ
ウム塩及びカリウム塩が水への溶解度が大きく好まし
い。これら三成分のホルムアルデヒド付加共縮合物を形
成するのに使用されるホルムアルデヒドの反応モル比
は、式（Ａ）、式（Ｂ）、及び式（Ｃ）の総モル数に対
し１〜５倍モル程度の範囲が好ましい。また使用するホ
ルムアルデヒドは、30〜40％の水溶液が好ましい。ホル
ムアルデヒドの付加共縮合反応は、塩基下のpH７〜11の
範囲で行う事が好ましい。また式（Ａ）、式（Ｂ）、及
び式（Ｃ）の構成モル比は1.0: 0.5〜1.0 : 0.1 〜1.0
の範囲であり、この範囲において石膏スラリーの流動性
を向上させ、更には添加した起泡剤による泡沫を消泡し
がたい。また本発明減水剤の平均分子量は1000〜 50000
の範囲が好ましく、2000〜 30000が更に好ましい。R in the formula (A) represents hydrogen or a lower alkyl group. As the lower alkyl group, a linear or branched alkyl having 1 to 6 carbon atoms such as methyl, ethyl, propyl, isopropyl, butyl, pentyl, and hexyl is preferable. Formula (B) is anilinesulfonic acid (sulfanilic acid) or an alkali salt thereof. The alkali salt is not particularly limited, but a sodium salt and a potassium salt are preferable because of high solubility in water. The reaction molar ratio of formaldehyde used to form these three-component formaldehyde addition cocondensate is 1 to 5 moles relative to the total number of moles of the formulas (A), (B) and (C). The range of the degree is preferable. The formaldehyde used is preferably a 30 to 40% aqueous solution. The addition cocondensation reaction of formaldehyde is preferably performed in a pH range of 7 to 11 under a base. The constitutional molar ratio of the formulas (A), (B) and (C) is 1.0: 0.5 to 1.0: 0.1 to 1.0.
Of the range, to improve the fluidity of the gypsum slurry in the range, more foam have ye to defoaming by the added foaming agent. The average molecular weight of the water reducing agent of the present invention is 1000 to 50000
Is preferable, and 2000 to 30,000 is more preferable.
【００１１】以下に本発明の減水剤の標準的製造法を示
すが、これによって本発明は何等限定されるものではな
い。The following is a standard method for producing the water reducing agent of the present invention, but the present invention is not limited thereto.
【００１２】所定量の（Ａ）フェノール又はアルキルフ
ェノールと、（Ｂ）スルファニル酸ナトリウムと、
（Ｃ）メラミンと、水とを計量し、pH７〜8.5 に調整し
た後、反応容器に仕込み、80〜90℃でホルマリンを１〜
３時間で滴下する。滴下後３〜15時間、縮合反応後、冷
却する事により本発明の減水剤を得る。本発明の減水剤
の半水石膏（焼石膏）に対する添加量は0.01％〜5.0 ％
であり、更に好ましくは0.05〜1.0 ％である。 石膏ボ
ード製造使用時に使用する場合、本発明品は減水剤溶
液、粉末の形態いずれも使用出来る。更に添加水に配合
したり、起泡剤水溶液に添加し使用する事も可能であ
る。あるいはポリビニルアルコール、メチルセルロー
ス、カルボキシメチルセルロース等のような水溶性高分
子、硫酸カリウム、コーンスターチ、及び繊維質物質と
の併用も可能である。また、無水石膏を使った石膏プラ
スター用減水剤として使用することも出来る。A predetermined amount of (A) phenol or alkylphenol, (B) sodium sulfanilate,
(C) Melamine and water are weighed and adjusted to pH 7 to 8.5, and then charged into a reaction vessel.
Drop in 3 hours. The water reducing agent of the present invention is obtained by cooling after the condensation reaction for 3 to 15 hours after the dropwise addition. The amount of the water reducing agent of the present invention added to hemihydrate gypsum (plaster of Paris) is 0.01% to 5.0%.
And more preferably 0.05 to 1.0%. When used in the production of gypsum board, the product of the present invention can be used in the form of a water reducing agent solution or powder. Furthermore, it is also possible to mix it with the added water or add it to the aqueous solution of the foaming agent before use. Alternatively, it can be used in combination with a water-soluble polymer such as polyvinyl alcohol, methylcellulose, carboxymethylcellulose, potassium sulfate, corn starch, and a fibrous substance. Also, it can be used as a water reducing agent for gypsum plaster using anhydrous gypsum.
【００１３】[0013]
【実施例】以下実施例により本発明を説明するが、本発
明は実施例のみに限定されるものではない。EXAMPLES The present invention will be described below with reference to examples, but the present invention is not limited to the examples.
【００１４】〔付加縮合物の製造例〕攪拌器付き反応器
にフェノール、スルファニル酸及びメラミンを表１に示
したモル数で仕込み、40％水酸化ナトリウム溶液と水を
加えてこの溶液のpHを8.5 に調整した。また固型分濃度
を38重量％に調整した。この溶液を85℃に昇温し、攪拌
しながら37％ホルマリンをホルムアルデヒドとして表１
に示したモル数で加え、反応混合物を還流下で反応させ
た。その後30℃に冷却し本発明の減水剤を得た。表１に
反応モル数、反応時間及び得られた共縮合物の平均分子
量を示す。[Production Example of Addition Condensate] Phenol, sulfanilic acid and melamine were charged into a reactor equipped with a stirrer in the number of moles shown in Table 1, and a 40% sodium hydroxide solution and water were added to adjust the pH of the solution. Adjusted to 8.5. The concentration of the solid component was adjusted to 38% by weight. This solution was heated to 85 ° C., and 37% formalin was converted to formaldehyde while stirring.
And the reaction mixture was reacted under reflux. Thereafter, the mixture was cooled to 30 ° C. to obtain a water reducing agent of the present invention. Table 1 shows the number of moles of the reaction, the reaction time, and the average molecular weight of the obtained co-condensate.
【００１５】[0015]
【表１】 [Table 1]
【００１６】〔半水石膏スラリーの分散性、凝結性試
験〕表１に示した６種類の本発明による減水剤を、以下
の条件により半水石膏スラリーの分散性及び凝結時間に
及ぼす影響を測定した。尚、比較の為にナフタレンスル
ホン酸ホルムアルデヒド高縮合物系減水剤〔マイテイ15
0 、花王（株）製〕、リグニンスルホン酸系減水剤（LI
GNOSITE 120 、Gerogia-Pacific Co. 製）を使用した。[Dispersibility and setting test of gypsum hemihydrate slurry] The effects of the six water reducing agents according to the present invention shown in Table 1 on the dispersibility and setting time of gypsum hemihydrate slurry were measured under the following conditions. did. For comparison, a naphthalenesulfonic acid formaldehyde high condensate-based water reducing agent [Mighty 15
0, manufactured by Kao Corporation], a ligninsulfonic acid-based water reducing agent (LI
GNOSITE 120, manufactured by Gerogia-Pacific Co.).
【００１７】・試験条件 水／半水石膏＝60％ 半水石膏＝燐酸副生焼石膏 減水剤の添加量＝0.1 ％、0.5 ％、及び1.0 ％ ・混練法 ピンミキサーにて60秒間混練した。Test conditions: Water / hemihydrate gypsum = 60% Hemihydrate gypsum = phosphoric acid by-product gypsum Additive amount of water reducing agent = 0.1%, 0.5%, and 1.0% Kneading method Kneading was performed by a pin mixer for 60 seconds.
【００１８】・分散性の測定 ５×５cmの円柱中空容器にスラリーを詰め、上部に引き
抜いた後の円状の広がりの直径を二個所測定し平均値
（mm）で示した。Measurement of Dispersibility The slurry was packed in a cylindrical hollow container of 5 × 5 cm, and the diameter of the circular spread after being pulled out to the upper portion was measured at two places and indicated as an average value (mm).
【００１９】・凝結時間の測定 JIS T 6604「歯科用焼石膏に準じて試験した。Measurement of setting time Test was performed in accordance with JIS T 6604 “Dental plaster of Paris.
【００２０】その結果を表２に示す。The results are shown in Table 2.
【００２１】[0021]
【表２】 [Table 2]
【００２２】〔石膏スラリーに添加した泡沫の安定性試
験〕本発明の各種減水剤を用いて、石膏スラリーに添加
した場合の泡沫の安定性と物性に及ぼす影響を評価し
た。試験条件を以下に示す。[Stability Test of Foam Added to Gypsum Slurry] Using the various water reducing agents of the present invention, the effects of foams added to gypsum slurry on foam stability and physical properties were evaluated. The test conditions are shown below.
【００２３】・試験条件 水／半水石膏＝60％ 半水石膏＝燐酸副生焼石膏 減水剤の添加量＝0.3 ％（対半水石膏）固型分換算 ・泡沫の調整 ポリオキシエチレンアルキルエーテルサルフェート系起
泡剤〔エマールD-3-D 、花王（株）製〕の0.5 ％（固型
分換算）溶液を発泡機（ガラスビーズ型）に通し、泡密
度0.06g/cm3 になるように調製した。Test conditions Water / hemihydrate gypsum = 60% hemihydrate gypsum = calculated gypsum by-produced phosphoric acid Addition amount of water reducing agent = 0.3% (based on gypsum hemihydrate) Conversion to solid content ・ Adjustment of foam Polyoxyethylene alkyl ether A 0.5% (solid content equivalent) solution of a sulfate-based foaming agent (Emal D-3-D, manufactured by Kao Corporation) is passed through a foaming machine (glass bead type) so that the foam density becomes 0.06 g / cm 3. Was prepared.
【００２４】・混練法 半水石膏1000ｇに上記泡沫を添加し（水溶液として25c
c）、更に減水剤を対半水石膏0.3 ％（固型分換算）添
加した水溶液を添加し、ピンミキサーで20秒間混練りし
た。Kneading method The above foam was added to 1000 g of hemihydrate gypsum (25 c as an aqueous solution).
c) Further, an aqueous solution to which a water reducing agent was added in an amount of 0.3% (in terms of solid content) of gypsum with respect to hemihydrate was added and kneaded with a pin mixer for 20 seconds.
【００２５】・分散性（フロー）の測定 ５×５cmの円柱中空容器にスラリーを詰め、上部に引き
抜いた後の円状の広がりの直径を二個所測定し平均値
（mm）で示した。Measurement of dispersibility (flow) A cylindrical hollow container of 5 × 5 cm was filled with the slurry, and the diameter of the circular spread after being pulled out at the upper portion was measured at two places and indicated as an average value (mm).
【００２６】その結果を表３に示す。Table 3 shows the results.
【００２７】[0027]
【表３】 [Table 3]
【００２８】表２より本発明の減水剤は、比較品の減水
剤に較べて分散性が大で、しかも凝結時間が速く優れた
減水剤である事が判る。また表３より添加した泡沫を消
泡しがたく、優れた減水剤である事が判る。From Table 2, it can be seen that the water reducing agent of the present invention has excellent dispersibility and a short setting time as compared with the water reducing agent of the comparative product, and is an excellent water reducing agent. Also, from Table 3, it can be seen that the added foam is hardly defoamed and is an excellent water reducing agent.
【００２９】[0029]
【発明の効果】半水石膏、水、混和剤（材）を配合して
なる石膏ボード製造時に於いて、本発明による石膏スラ
リー用減水剤を使用することにより、半水石膏／スラリ
ーの流動性を高め、乾燥エネルギーを低減することが可
能になる。Effect of the Invention In the production of a gypsum board containing gypsum hemihydrate, water and an admixture (material), the fluidity of gypsum hemihydrate / slurry can be improved by using the water reducing agent for gypsum slurry according to the present invention. And drying energy can be reduced.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭60−65756（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) C04B 24/30 C04B 28/14 ────────────────────────────────────────────────── (5) References JP-A-60-65756 (JP, A) (58) Fields investigated (Int. Cl. 7 , DB name) C04B 24/30 C04B 28/14
Claims (1)
記の式（Ｂ）で表される化合物と、下記の式（Ｃ）で表
される化合物とのホルムアルデヒド付加共縮合物であっ
て、それらの構成モル比が、（Ａ）：（Ｂ）：（Ｃ）＝
1.0 ：0.5 〜1.0 ：0.1 〜1.0 であるホルムアルデヒド
付加共縮合物を必須成分として含有する石膏スラリー用
減水剤。 【化１】 【化２】 【化３】 1. A compound represented by the following formula (A), lower
A compound represented by the following formula (B) and a compound represented by the following formula (C):
Met formaldehyde addition co-condensation product of the compound
And their constituent molar ratios are (A) :( B) :( C) =
1.0: A water reducing agent for gypsum slurries containing a formaldehyde addition cocondensate of 0.5 to 1.0: 0.1 to 1.0 as an essential component. Embedded image Embedded image Embedded image
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2409127A JP3067811B2 (en) | 1990-12-28 | 1990-12-28 | Water reducing agent for gypsum slurry |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2409127A JP3067811B2 (en) | 1990-12-28 | 1990-12-28 | Water reducing agent for gypsum slurry |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04254452A JPH04254452A (en) | 1992-09-09 |
| JP3067811B2 true JP3067811B2 (en) | 2000-07-24 |
Family
ID=18518491
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2409127A Expired - Fee Related JP3067811B2 (en) | 1990-12-28 | 1990-12-28 | Water reducing agent for gypsum slurry |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3067811B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013137402A1 (en) | 2012-03-14 | 2013-09-19 | 東邦化学工業株式会社 | Gypsum dispersant |
| WO2013137400A1 (en) | 2012-03-14 | 2013-09-19 | 東邦化学工業株式会社 | Gypsum dispersant |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104961375B (en) * | 2015-06-26 | 2017-03-08 | 金陵科技学院 | A kind of preparation method of the modified sulfamate high-effective water-reducing agent containing carboxyl |
-
1990
- 1990-12-28 JP JP2409127A patent/JP3067811B2/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013137402A1 (en) | 2012-03-14 | 2013-09-19 | 東邦化学工業株式会社 | Gypsum dispersant |
| WO2013137400A1 (en) | 2012-03-14 | 2013-09-19 | 東邦化学工業株式会社 | Gypsum dispersant |
| KR20150004342A (en) | 2012-03-14 | 2015-01-12 | 도호 가가꾸 고오교 가부시키가이샤 | Gypsum dispersant |
| KR20150004341A (en) | 2012-03-14 | 2015-01-12 | 도호 가가꾸 고오교 가부시키가이샤 | Gypsum dispersant |
| US9382155B2 (en) | 2012-03-14 | 2016-07-05 | Toho Chemical Industry Co., Ltd. | Gypsum dispersant |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04254452A (en) | 1992-09-09 |
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