WO2021070699A1 - Composition de dispersant pour compositions hydrauliques destinées au moulage centrifuge - Google Patents

Composition de dispersant pour compositions hydrauliques destinées au moulage centrifuge Download PDF

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WO2021070699A1
WO2021070699A1 PCT/JP2020/037114 JP2020037114W WO2021070699A1 WO 2021070699 A1 WO2021070699 A1 WO 2021070699A1 JP 2020037114 W JP2020037114 W JP 2020037114W WO 2021070699 A1 WO2021070699 A1 WO 2021070699A1
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component
group
monomer
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PCT/JP2020/037114
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Japanese (ja)
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恒平 島田
谷所　美明
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花王株式会社
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B28—WORKING CEMENT, CLAY, OR STONE
    • B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
    • B28B1/00—Producing shaped prefabricated articles from the material
    • B28B1/20—Producing shaped prefabricated articles from the material by centrifugal or rotational casting
    • 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
    • C04B24/04—Carboxylic acids; Salts, anhydrides or esters thereof
    • C04B24/06—Carboxylic acids; Salts, anhydrides or esters thereof containing hydroxy groups
    • 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
    • C04B24/24—Macromolecular compounds
    • C04B24/26—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • 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
    • C04B28/02—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 hydraulic cements other than calcium sulfates
    • 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
    • C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
    • C04B40/02—Selection of the hardening environment
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
    • C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
    • C08F220/04—Acids; Metal salts or ammonium salts thereof
    • C08F220/06—Acrylic acid; Methacrylic acid; Metal salts or ammonium salts thereof
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F261/00—Macromolecular compounds obtained by polymerising monomers on to polymers of oxygen-containing monomers as defined in group C08F16/00
    • C08F261/06—Macromolecular compounds obtained by polymerising monomers on to polymers of oxygen-containing monomers as defined in group C08F16/00 on to polymers of unsaturated ethers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F265/00—Macromolecular compounds obtained by polymerising monomers on to polymers of unsaturated monocarboxylic acids or derivatives thereof as defined in group C08F20/00
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F290/00—Macromolecular compounds obtained by polymerising monomers on to polymers modified by introduction of aliphatic unsaturated end or side groups
    • C08F290/02—Macromolecular compounds obtained by polymerising monomers on to polymers modified by introduction of aliphatic unsaturated end or side groups on to polymers modified by introduction of unsaturated end groups
    • C08F290/06—Polymers provided for in subclass C08G

Definitions

  • the present invention relates to a dispersant composition for a water-hard composition for centrifugation and a method for producing the same, a water-hard composition for centrifugation, and a method for producing a cured product of the water-hard composition.
  • Centrifugal molding is known as a method for manufacturing hollow cylindrical concrete molded products such as pipes, piles, and poles.
  • This centrifugal molding method is a method in which a kneaded concrete material is put into a mold and the concrete is compacted by pressing the concrete against the inner surface of the mold by the centrifugal force generated by rotating the mold at high speed. Forming by the centrifugal molding method is carried out before the uncured concrete hardens, but in production lines where it takes time to prepare the formwork under high temperature or in a very tight production situation, from kneading to centrifugal molding.
  • Japanese Unexamined Patent Publication No. 2002-121055 describes the unsaturated (poly) alkylene glycol ether-based monomer represented by the general formula (1) and the unsaturated monocarboxylic acid-based monomer represented by the general formula (2).
  • a cement dispersant containing a copolymer containing the constituent unit of the above as an essential component and containing at least a structure in which the constituent unit is derived from acrylic acid (salt) is disclosed.
  • Japanese Patent Application Laid-Open No. 2002-348161 describes a structural unit (III) derived from a specific unsaturated polyalkylene glycol ether-based monomer (a2) and a specific unsaturated monocarboxylic acid-based monomer (b).
  • the number of milliequivalents of carboxyl groups when the structural unit (II) contains at least a structure derived from methacrylic acid (salt) and all the carboxyl groups of the copolymer are converted to the unneutralized type is per 1 g of the copolymer.
  • Cement dispersants of 3.30 meq or less are disclosed.
  • 2009-96672 describes a monomer containing a specific monomer 1 represented by the general formula (1) and a specific monomer 2 represented by the general formula (2), and a general formula.
  • the specific monomer 1 represented by the general formula (1), the specific monomer 2 represented by the general formula (2), and the general formula (3) are represented.
  • a dispersion-holding agent for a water-hard composition obtained by polymerizing a specific monomer 3 and having a weight average molecular weight of 30,000 to 60,000, the composition of the copolymer of the copolymer.
  • Dispersion-retaining agents for water-hard compositions are disclosed, wherein the monomer 1 is 25 to 78% by weight and the monomer 3 is 0 to 18% by weight among the polymers.
  • a dispersant composition for a water-hard composition for centrifugation and a dispersant composition thereof, wherein the water-hard composition exhibits better moldability for a certain period of time (for example, 15 minutes or more and 60 minutes or less) after kneading In the method and the water-hard composition for centrifugation, the water-hard composition for centrifugation and the water-hard composition for which the water-hard composition exhibits better moldability for a certain period of time (15 minutes or more and 60 minutes or less) after kneading.
  • a method for producing a cured product is provided.
  • the present invention relates to a dispersant composition for a water-hard composition for centrifugation, which contains the following component (A) and water.
  • Component (A) A monomer (A1) represented by the following general formula (A1), a monomer (A2) represented by the following general formula (A2), and a single amount represented by the following general formula (A3).
  • the copolymer (A) in which 30 mol% or more and 70 mol% or less, the monomer (A2) is 10 mol% or more and 50 mol% or less, and the monomer (A3) is 20 mol% or more and 35 mol% or less.
  • R 11a , R 12a , R 13a may be the same or different and may be a hydrogen atom, a methyl group or (CH 2 ) r COM 2a , where (CH 2 ) r COM 2a is COM 1a or another (CH 2).
  • R COMM 2a may form an anhydride, in which case M 1a , M 2a of those groups are absent.
  • M 1a , M 2a The same or different, hydrogen atom, alkali metal, alkaline earth metal (1/2 atom), ammonium group, alkylammonium group or substituted alkylammonium group r: Number of 0 or more and 2 or less Is shown. ]
  • R 21a , R 22a may be the same or different, hydrogen atom or methyl group
  • R 23a hydrogen atom or -COO (AO)
  • n X 1a X 1a Alkyl group or hydrogen atom having 1 or more and 4 or less carbon atoms
  • AO Group selected from ethyleneoxy group and propyleneoxy group
  • n Average number of moles of AO, 5 or more and 70 or less
  • p 0 or more and 2
  • the following numbers q Indicates the number of 0 or 1.
  • R 31a Indicates a hydrocarbon group that may contain a heteroatom having 1 or more and 4 or less carbon atoms.
  • the present invention also relates to a method for producing a dispersant composition for a water-hard composition for centrifugation, which mixes the component (A) with water.
  • the present invention also relates to a hydraulic composition for centrifugation, which contains the component (A), a hydraulic powder, an aggregate and water.
  • the present invention also relates to a method for producing a cured product of a hydraulic composition, which comprises the following steps.
  • Step 1 A step of mixing the component (A), the hydraulic powder, the aggregate, and water to obtain a hydraulic composition, and filling the mold with the obtained hydraulic composition.
  • Step 2 A step of applying centrifugal force to mold the hydraulic composition filled in the mold obtained in Step 1.
  • Step 3 A step of condensing the mold-clamped hydraulic composition obtained in Step 2 in a mold.
  • a dispersant composition for a water-hard composition for centrifugation and a method for producing the same in which the water-hard composition exhibits more excellent moldability for a certain period of time from kneading.
  • a water-hardening composition for centrifugal molding in which the water-hardening composition exhibits more excellent moldability for a certain period of time from kneading, and a method for producing a cured water-hardening composition.
  • This fixed time is, for example, 15 minutes or more and 60 minutes or less from kneading (meaning from the time when water first comes into contact with the hydraulic powder; the same applies hereinafter).
  • Embodiment for carrying out the invention The present inventors include the monomer (A1), the monomer (A2), and the monomer (A3) as constituent monomers in a specific ratio.
  • the dispersant composition for a water-hard composition for centrifugation containing the component (A) which is a polymer is used for the water-hard composition for centrifugation, it takes a certain period of time from kneading (for example, 15 minutes or more and 60 minutes or less). During the period, it was found that the moldability of the water-hard composition was improved. The reason for such an effect is not always clear, but it is presumed as follows.
  • the component (A) which is a copolymer containing the monomer (A1), the monomer (A2), and the monomer (A3) as constituent monomers in a specific ratio, is at the initial stage of kneading. Has low adsorptivity to cement particles, and more component (A) remains in bulk water than a general polycarboxylic acid-based dispersant. By gradually adsorbing the residual component (A) to the cement particles over time, the dispersed state of the cement particles is maintained, and the fluidity of the concrete is maintained, so that a certain period of time (for example, 15 minutes or more) from kneading is 60. It is considered that the hydraulic composition exhibits better moldability during the period (less than a minute).
  • the present invention provides a dispersant composition for a water-hard composition for centrifugation, which contains the component (A) and water.
  • the components (A) are the monomer (A1) represented by the following general formula (A1), the monomer (A2) represented by the following general formula (A2), and the simple compound represented by the following general formula (A3).
  • R 11a , R 12a , R 13a may be the same or different and may be a hydrogen atom, a methyl group or (CH 2 ) r COM 2a , where (CH 2 ) r COM 2a is COM 1a or another (CH 2).
  • R COMM 2a may form an anhydride, in which case M 1a , M 2a of those groups are absent.
  • M 1a , M 2a The same or different, hydrogen atom, alkali metal, alkaline earth metal (1/2 atom), ammonium group, alkylammonium group or substituted alkylammonium group r: Number of 0 or more and 2 or less Is shown. ]
  • R 21a , R 22a may be the same or different, hydrogen atom or methyl group
  • R 23a hydrogen atom or -COO (AO)
  • n X 1a X 1a Alkyl group or hydrogen atom having 1 or more and 4 or less carbon atoms
  • AO Group selected from ethyleneoxy group and propyleneoxy group
  • n Average number of moles of AO, 5 or more and 70 or less
  • p 0 or more and 2
  • the following numbers q Indicates the number of 0 or 1.
  • R 31a Indicates a hydrocarbon group that may contain a heteroatom having 1 or more and 4 or less carbon atoms.
  • R 11a is preferably a hydrogen atom from the viewpoint of stability of centrifugation over time.
  • R 12a is preferably a methyl group or a hydrogen atom, and more preferably a hydrogen atom, from the viewpoint of stability of centrifugation over time.
  • R 13a is preferably a hydrogen atom.
  • anhydrous may be formed with COOM 1a or other (CH 2 ) r COMM 2a , in which case M 1a and M 2a of those groups are absent.
  • M 1a and M 2a in the general formula (A1) may be the same or different, and hydrogen atoms are preferable, respectively.
  • the r of (CH 2 ) r COMM 2a in the general formula (A1) is preferably 1 from the viewpoint of stability of centrifugal moldability over time.
  • R 21a is preferably a hydrogen atom from the viewpoint of stability of centrifugation over time.
  • R 22a is preferably a methyl group from the viewpoint of stability of centrifugation over time.
  • R 23a is preferably a hydrogen atom from the viewpoint of stability of centrifugation over time.
  • X 1a is preferably a methyl group or a hydrogen atom from the viewpoint of stability of centrifugation over time.
  • the AO is preferably an ethyleneoxy group from the viewpoint of stability of centrifugation over time. The AO preferably contains an ethyleneoxy group.
  • n is the average number of moles added of AO, which is 5 or more and 70 or less.
  • n is preferably 10 or more, more preferably 15 or more, still more preferably 20 or more, still more preferably 25 or more, still more preferably 25 or more, from the viewpoint of workability, dispersibility and stability of centrifugation over time.
  • the number is 30, more preferably 35 or more, even more preferably 40 or more, even more preferably 45 or more, even more preferably 50 or more, and preferably 65 or less, more preferably 60 or less.
  • p is preferably 1 or 2 from the viewpoint of stability of centrifugation over time.
  • q is preferably 0 from the viewpoint of stability of centrifugation over time.
  • R 31a is a hydrocarbon group which may contain a heteroatom having 1 or more carbon atoms, preferably 2 or more carbon atoms, and 4 or less, preferably 3 or less carbon atoms. Heteroatoms are oxygen atoms, nitrogen atoms and the like.
  • Examples of the monomer (A3) include one or more selected from methyl acrylate, 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, 3-hydroxypropyl acrylate, methoxyethyl acrylate, and n-butyl acrylate. From the viewpoint of stability of centrifugation over time, one or more selected from methyl acrylate, 2-hydroxyethyl acrylate and 2-hydroxypropyl acrylate is preferable.
  • the monomer (A1) is 30 mol% or more, preferably 40 mol% or more, more preferably 50 mol% or more, and 70. Mol% or less, preferably 65 mol% or less, more preferably 60 mol% or less, From the viewpoint of fluidity and stability of centrifugation over time, the monomer (A2) is 10 mol% or more, preferably 14 mol% or more, and 50 mol% or less, preferably 45 mol% or less.
  • the monomer (A3) is 20 mol% or more, preferably 25 mol% or more, more preferably 30 mol% or more, and 35 mol% or less from the viewpoint of stability of centrifugal moldability over time.
  • the copolymer (A) is a monomer (A1), a monomer (A2), and a monomer (A3) in the constituent monomers from the viewpoint of fluidity and stability of centrifugation over time.
  • the total amount of the above is 90 mol% or more, preferably 92 mol% or more, more preferably 95 mol% or more, and 100 mol% or less. This total amount may be 100 mol%.
  • the weight average molecular weight of the copolymer (A) is preferably 10,000 or more, more preferably 15,000 or more, still more preferably 20,000 or more, and preferably 100, from the viewpoint of fluidity and workability. It is 000 or less, more preferably 70,000 or less, still more preferably 50,000 or less. This weight average molecular weight was measured by gel permeation chromatography (GPC) under the following conditions.
  • the component (A) is preferably 1% by mass or more, more preferably 10% by mass or more, from the viewpoint of stability of centrifugal moldability over time. It is more preferably 20% by mass or more, preferably 60% by mass or less, more preferably 50% by mass or less, still more preferably 40% by mass or less.
  • the dispersant composition for a water-hard composition for centrifugation of the present invention preferably further contains the following component (B) from the viewpoint of fluidity and stability of centrifugation over time.
  • R 11b, R 12b, R 13b may be the same or different, a hydrogen atom, a methyl group or (CH 2) r 'COOM 2b , (CH 2) r COOM 2b is, COOM 1b or other (CH 2) r 'COOM 2b and may form an anhydride, in which case, M 1b of those groups, M 2b is absent.
  • M 1b , M 2b The same or different, hydrogen atom, alkali metal, alkaline earth metal (1/2 atom), ammonium group, alkylammonium group or substituted alkylammonium group r': 0 or more and 2 or less Show the number.
  • R 21b, R 22b may be the same or different, a hydrogen atom or a methyl group
  • R 23b a hydrogen atom or -COO (AO)
  • X 1b Alkyl group or hydrogen atom having 1 or more and 4 or less carbon atoms
  • AO Group selected from ethyleneoxy group and propyleneoxy group
  • n' Average number of moles of AO, 5 or more and 100 or less
  • p' 0 Numbers greater than or equal to 2 and less than or equal to q': Indicates a number of 0 or 1.
  • R 11b is preferably a hydrogen atom from the viewpoint of stability of centrifugation over time.
  • R 12b is preferably a methyl group or a hydrogen atom from the viewpoint of stability of centrifugation over time.
  • R 13b is preferably a hydrogen atom from the viewpoint of stability of centrifugation over time.
  • M 1b and M 2b may be the same or different in the general formula (B2) from the viewpoint of stability of centrifugation over time, and hydrogen atoms are preferable for each.
  • the 'r of COOM 2b' formula (B1) in the (CH 2) r, from the viewpoint of the stability of a centrifugal molding property over time, 1 is preferable.
  • R 21b is preferably a hydrogen atom from the viewpoint of stability of centrifugation over time.
  • R 22b is preferably a methyl group from the viewpoint of stability of centrifugation over time.
  • R 23b is preferably a hydrogen atom from the viewpoint of stability of centrifugation over time.
  • X 1b is preferably a methyl group or a hydrogen atom from the viewpoint of stability of centrifugation over time.
  • the AO is preferably an ethyleneoxy group from the viewpoint of stability of centrifugation over time. The AO preferably contains an ethyleneoxy group.
  • n' is the average number of moles added of AO, which is 5 or more and 100 or less. n'is preferably 10 or more, more preferably 20 or more, and preferably 80 or less, more preferably 60 or less, from the viewpoint of fluidity, workability, and stability of centrifugation over time. ..
  • p' is preferably 1 or 2 from the viewpoint of stability of centrifugation over time.
  • q' is preferably 0 from the viewpoint of stability of centrifugation over time.
  • the monomer (B1) is 70 mol% or more, preferably more than 70 mol%, more preferably 72 mol% or more, still more preferably 72 mol% or more, from the viewpoint of fluidity, workability and stability of centrifugation over time. Is 75 mol% or more and 99 mol% or less, preferably 92 mol% or less, more preferably 85 mol% or less,
  • the monomer (B2) is 1 mol% or more, preferably 8 mol% or more, more preferably 15 mol% or more, and 30 from the viewpoint of fluidity, workability, and stability of centrifugation over time. It is mol% or less, preferably 28 mol% or less, and more preferably 25 mol% or less.
  • the total amount of the monomer (B1) and the monomer (B2) in the constituent monomer of the copolymer (B) is 90 mol from the viewpoint of fluidity and stability of centrifugation over time. % Or more, preferably 92 mol% or more, more preferably 95 mol% or more, and 100 mol% or less. This total amount may be 100 mol%.
  • the weight average molecular weight of the copolymer (B) is preferably 10,000 or more, more preferably 15,000 or more, still more preferably 20,000 or more, and preferably 100, from the viewpoint of fluidity and workability. It is 000 or less, more preferably 70,000 or less, still more preferably 50,000 or less. This weight average molecular weight was measured by gel permeation chromatography (GPC) under the following conditions.
  • the component (B) is preferably 1% by mass or more, more preferably, from the viewpoint of fluidity, workability and stability of centrifugation over time. Is contained in an amount of 10% by mass or more, more preferably 20% by mass or more, and preferably 50% by mass or less, more preferably 40% by mass or less, still more preferably 30% by mass or less.
  • the total content of the component (A) and the component (B) is preferably 2% by mass or more from the viewpoint of the stability of the centrifugal moldability over time. , More preferably 10% by mass or more, further preferably 20% by mass or more, and preferably 60% by mass or less, more preferably 55% by mass or less, still more preferably 50% by mass or less.
  • the mass ratio (B) / (A) of the content of the component (A) to the content of the component (B) is the fluidity and centrifugation with respect to the passage of time. From the viewpoint of moldability stability, it is preferably 0.02 or more, more preferably 0.1 or more, still more preferably 0.2 or more, still more preferably 0.5 or more, and preferably 10 or less, more preferably. It is 5 or less, more preferably 3 or less, still more preferably 2.5 or less, still more preferably 2 or less, still more preferably 1.5 or less, still more preferably 1 or less.
  • the dispersant composition for a water-hard composition for centrifugation of the present invention preferably further contains the following component (C) from the viewpoint of strength development and stability of centrifugation over time.
  • Examples of the hydroxycarboxylic acid of the component (C) include one or more selected from lactic acid, citric acid, tartrate acid, and gluconic acid, and lactic acid, from the viewpoint of strength development and stability of centrifugation over time.
  • One or more selected from citric acid and gluconic acid are more preferable, and one or more selected from lactic acid and gluconic acid are further preferable.
  • the component (C) is preferably 0.0001% by mass or more, more preferably 0.0001% by mass or more, from the viewpoint of strength development and stability of centrifugation over time. Is contained in an amount of 0.001% by mass or more, more preferably 0.01% by mass or more, and preferably 10% by mass or less, more preferably 5% by mass or less, still more preferably 1% by mass or less.
  • the total content of the component (A), the component (B) and the component (C) is determined from the viewpoint of fluidity and stability of centrifugation over time. Therefore, it is preferably contained in an amount of 2% by mass or more, more preferably 10% by mass or more, further preferably 20% by mass or more, and preferably 60% by mass or less, more preferably 55% by mass or less, still more preferably 50% by mass or less. To do.
  • / (C) is preferably 1 or more, more preferably 5 or more, still more preferably 10 or more, still more preferably 15 or more, and preferably 1 or more, from the viewpoint of fluidity and stability of centrifugation over time. It is 100 or less, more preferably 50 or less, still more preferably 25 or less.
  • the dispersant composition for a water-hard composition for centrifugal molding of the present invention contains water, preferably 10% by mass or more, more preferably 12% by mass or more, still more preferably 12% by mass or more, from the viewpoint of stability of centrifugal moldability over time. It is contained in an amount of 14% by mass or more, preferably 30% by mass or less, more preferably 28% by mass or less, still more preferably 25% by mass or less.
  • the dispersant composition for a water-hardening composition for centrifugation of the present invention is a conventional cement dispersant, a water-soluble polymer compound, an air entraining agent, a cement wetting agent, a swelling material, a waterproofing agent, a retarding agent, a quick-setting agent, and an increase.
  • Ingredients such as thickeners, flocculants, drying shrinkage reducing agents, strength enhancers, curing accelerators, preservatives, antifoaming agents [However, those corresponding to (A) component, (B) component, and (C) component Excludes] can be contained.
  • the present invention provides a method for producing a dispersant composition for a water-hard composition for centrifugation, which mixes the component (A) with water.
  • the dispersant composition for a water-hard composition for centrifugation of the present invention containing the component (A) and water is produced.
  • the dispersant composition for a water-hard composition for centrifugation of the present invention containing the component (A), the component (B), and water is produced.
  • the dispersant composition for a water-hard composition for centrifugation of the present invention containing the component (A), the component (B), the component (C), and water is produced.
  • Specific examples and preferred embodiments of the components (A), (B), and (C) used in the method for producing a dispersant composition for a water-hard composition for centrifugation of the present invention are the water for centrifugation of the present invention, respectively. It is the same as that described in the dispersant composition for a rigid composition.
  • the matters described in the dispersant composition for a water-hard composition for centrifugation of the present invention can be appropriately applied to the method for producing a dispersant composition for a water-hard composition for centrifugation of the present invention.
  • the content of each component and the mass ratio thereof described in the dispersant composition for a water-hard composition for centrifugation of the present invention are each component.
  • the content of can be replaced with a mixed amount and applied as appropriate.
  • the present invention provides a hydraulic composition for centrifugation, which contains the component (A), a hydraulic powder, an aggregate and water.
  • the water-hardening composition for centrifugation of the present invention preferably further contains the component (B). That is, the present invention provides a hydraulic composition for centrifugation, which contains a component (A), a component (B), a hydraulic powder, an aggregate and water.
  • the water-hardening composition for centrifugation of the present invention preferably further contains the component (C). That is, the present invention provides a hydraulic composition for centrifugation, which contains a component (A), a component (B), a component (C), a hydraulic powder, an aggregate and water.
  • Specific examples and preferred embodiments of the component (A), the component (B), and the component (C) used in the water-hard composition for centrifugation of the present invention are the dispersant composition for the water-hard composition for centrifugation of the present invention, respectively. It is the same as that described in.
  • the matters described in the dispersant composition for a water-hard composition for centrifugation of the present invention and the method for producing the same can be appropriately applied to the water-hard composition for centrifugation of the present invention.
  • the hydraulic powder used in the hydraulic composition for centrifugation of the present invention is a powder having a physical property that is cured by a hydration reaction, and examples thereof include cement and gypsum.
  • it is a cement such as ordinary Portoland cement, belite cement, moderate heat cement, early-strength cement, ultra-fast-strength cement, sulfate-resistant cement, and blast furnace slag, fly ash, silica fume, stone powder (calcium carbonate powder) and the like. May be used, such as blast furnace slag cement, fly ash cement, and silica fume cement to which is added.
  • the hydraulic composition finally obtained by adding sand, sand and gravel as aggregates to these powders is generally called mortar, concrete or the like, respectively.
  • the water-hardening composition for centrifugation of the present invention contains an aggregate.
  • the aggregate include aggregates selected from fine aggregates and coarse aggregates.
  • the fine aggregate include those specified by No. 2311 in JIS A0203-2014.
  • Fine aggregates include river sand, land sand, mountain sand, sea sand, lime sand, silica sand and their crushed sand, blast furnace slag fine aggregate, ferronickel slag fine aggregate, lightweight fine aggregate (artificial and natural) and recycled. Examples include fine aggregates.
  • the coarse aggregate those specified by No. 2312 in JIS A0203-2014 can be mentioned.
  • coarse aggregates include river gravel, land gravel, mountain gravel, sea gravel, lime gravel, crushed stones, blast furnace slag coarse aggregate, ferronickel slag coarse aggregate, lightweight coarse aggregate (artificial and natural) and recycled.
  • coarse aggregates include river gravel, land gravel, mountain gravel, sea gravel, lime gravel, crushed stones, blast furnace slag coarse aggregate, ferronickel slag coarse aggregate, lightweight coarse aggregate (artificial and natural) and recycled.
  • coarse aggregate and the like can be mentioned.
  • different types may be mixed and used, or a single type may be used.
  • the content of the component (A) is preferably 0 with respect to 100 parts by mass of the water-hard powder from the viewpoint of fluidity and stability of centrifuge over time. .1 parts by mass or more, more preferably 0.2 parts by mass or more, further preferably 0.3 parts by mass or more, and preferably 10 parts by mass or less, more preferably 8 parts by mass or less, still more preferably 6 parts by mass or less. , More preferably 3 parts by mass or less, still more preferably 1 part by mass or less, still more preferably 0.75 parts by mass or less, still more preferably 0.5 parts by mass or less.
  • the content of the component (B) is preferably 0 with respect to 100 parts by mass of the water-hard powder from the viewpoint of fluidity and stability of centrifuge over time. 0.01 parts by mass or more, more preferably 0.1 parts by mass or more, still more preferably 0.2 parts by mass or more, and preferably 10 parts by mass or less, more preferably 8 parts by mass or less, still more preferably 6 parts by mass or less. , More preferably 3 parts by mass or less, still more preferably 1 part by mass or less, still more preferably 0.75 parts by mass or less, still more preferably 0.5 parts by mass or less.
  • the total content of the component (A) and the component (B) is 100 parts by mass of the water-hard powder from the viewpoint of fluidity and stability of centrifuge over time.
  • the mass ratio (B) / (A) of the content of the component (A) to the content of the component (B) is stable in fluidity and centrifuge property over time. From the viewpoint of sex, it is preferably 0.02 or more, more preferably 0.1 or more, still more preferably 0.2 or more, still more preferably 0.5 or more, and preferably 10 or less, more preferably 5 or less, further. It is preferably 3 or less, more preferably 2.5 or less, still more preferably 2 or less, still more preferably 1.5 or less, and even more preferably 1 or less.
  • the content of the component (C) is preferably 0.00001 mass with respect to 100 parts by mass of the water-hard powder from the viewpoint of stability of the centrifugal moldability over time.
  • Parts or more more preferably 0.0001 parts by mass or more, still more preferably 0.001 parts by mass or more, still more preferably 0.01 parts by mass or more, and preferably 1 part by mass or less, more preferably 0.5 parts by mass. It is less than a part, more preferably 0.1 part by mass or less, still more preferably 0.05 part by mass or less.
  • the total content of the components (A), (B) and (C) is determined from the viewpoint of fluidity and stability of centrifugation over time.
  • 100 parts by mass of the body preferably 0.1 part by mass or more, more preferably 0.2 parts by mass or more, further preferably 0.3 parts by mass or more, and preferably 10 parts by mass or less, more preferably 8 parts by mass. It is less than or equal to parts by mass, more preferably 6 parts by mass or less, still more preferably 3 parts by mass or less, and even more preferably 1 part by mass or less.
  • the mass ratio [(A) + (B)] / (C) of the total content of the components (A) and (B) to the content of the component (C) is From the viewpoint of fluidity and stability of centrifugation over time, preferably 1 or more, more preferably 5 or more, still more preferably 10 or more, still more preferably 15 or more, and preferably 100 or less, more preferably. Is 50 or less, more preferably 25 or less.
  • the water / water-hard powder ratio (hereinafter, may be referred to as W / P) is preferably 10% by mass or more from the viewpoint of centrifugal moldability and strength, and 12 7% by mass or more is more preferable, 14% by mass or more is further preferable, 30% by mass or less is preferable, 25% by mass or less is more preferable, 24% by mass or less is further preferable, 23% by mass or less is further preferable, and 22. More preferably, it is by mass or less.
  • the water / water-hard powder ratio is a mass percentage (mass%) of water and the water-hard powder in the water-hard composition, and is calculated by water / water-hard powder ⁇ 100.
  • the water / hydraulic powder ratio is calculated based on the amount of powder having physical characteristics that hardens by a hydration reaction.
  • the amount of the high-strength admixture is also included in the amount of the hydraulic powder. The same applies to other quantitative relationships of hydraulic compositions with respect to hydraulic powders.
  • the amount of coarse aggregate used reduces the development of the strength of the hydraulic composition and the amount of hydraulic powder such as cement, and improves the filling property into the mold and the like.
  • the bulk volume is preferably 50% or more, more preferably 55% or more, further preferably 60% or more, and preferably 100% or less, more preferably 90% or less, still more preferably 80. % Or less.
  • the bulk volume is the ratio of the volume (including voids) of the coarse aggregate in 1 m 3 of concrete.
  • the amount of fine aggregate used is preferably 500 kg / m 3 or more, more preferably 600 kg / m 3 or more, from the viewpoint of improving the filling property into a mold or the like. , More preferably 700 kg / m 3 or more, and preferably 1000 kg / m 3 or less, more preferably 900 kg / m 3 or less.
  • the amount of fine aggregate is preferably from 800 kg / m 3 or more, more preferably 900 kg / m 3 or more, more preferably 1000 kg / m 3 or more, and preferably Is 2000 kg / m 3 or less, more preferably 1800 kg / m 3 or less, still more preferably 1700 kg / m 3 or less.
  • water-hardening composition for centrifugal molding examples include concrete and the like. Of these, concrete using cement is preferable.
  • the hydraulic composition of the present invention can be used for self-leveling, refractory, plaster, lightweight or heavy concrete, AE, repair, prepacked, traymy, ground improvement, grout, cold weather, etc. It is also useful in the field of.
  • the water-hardening composition for centrifugation of the present invention may also contain a fast-strengthening agent such as glycerin and N-methyldiethanolamine and a chelating agent such as sodium ethylenediaminetetraacetate.
  • a fast-strengthening agent such as glycerin and N-methyldiethanolamine
  • a chelating agent such as sodium ethylenediaminetetraacetate.
  • the content of the chelating agent is preferably 0.1 part by mass or less with respect to 100 parts by mass in total of the hydraulic powder and the high-strength admixture containing silica from the viewpoint of developing strength after steam curing.
  • the water-hardening composition for centrifugation of the present invention is a conventional cement dispersant, water-soluble polymer compound, air entraining agent, cement wetting agent, swelling agent, waterproofing agent, retarding agent, quick-setting agent, foaming agent, foaming agent. , Waterproofing agent, fluidizing agent, thickener, flocculant, drying shrinkage reducing agent, strength enhancer, curing accelerator, preservative, antifoaming agent, etc. [However, (A) component, (B) component, (C) excluding those corresponding to the component] can be contained.
  • the present invention provides a method for producing a hydraulic composition for centrifugation, which mixes a component (A), a hydraulic powder, an aggregate and water.
  • the hydraulic composition for centrifugation of the present invention containing the component (A), the hydraulic powder, the aggregate, and water is produced.
  • the hydraulic composition for centrifugation of the present invention containing the component (A), the component (B), the hydraulic powder, the aggregate, and water is produced.
  • the hydraulic composition for centrifugation of the present invention containing the component (A), the component (B), the component (C), the hydraulic powder, the aggregate, and water is produced.
  • Specific examples and preferred embodiments of the component (A), the component (B), and the component (C) used in the method for producing the water-hard composition for centrifugation of the present invention are each dispersed for the water-hard composition for centrifugation of the present invention. It is the same as that described in the agent composition. Further, specific examples and preferred embodiments of the water-hard powder and the aggregate used in the method for producing the water-hard composition for centrifugation of the present invention are the same as those described in the water-hard composition for centrifugation of the present invention.
  • the hydraulic powder is used so that the W / P is within the range described in the hydraulic composition for centrifugation of the present invention.
  • the amount of aggregate used is also the same as that described in the water-hardening composition for centrifugation of the present invention.
  • the content of each component and the mass ratio thereof described in the water-hard composition for centrifugation of the present invention are appropriately adjusted by substituting the content of each component with a mixed amount.
  • the dispersant composition for a water-hard composition for centrifugation of the present invention, a method for producing the same, and the matters described in the water-hard composition for centrifugation can be appropriately applied to the method for producing a water-hard composition for centrifugation of the present invention. it can.
  • a component (A), an arbitrary component (B), an arbitrary component (C), and water are mixed in advance to form a hydraulic powder. It is preferred to mix with the body.
  • the addition of the component (A), the optional component (B) and the optional component (C) is carried out by adding the dispersant composition for the water-hard composition for centrifugation of the present invention. It is preferable to add the mixture using, and it is more preferable to mix the dispersant composition for a water-hard composition for centrifugation of the present invention with water in advance and mix it with the water-hard powder.
  • a mortar mixer Mixing the component (A), the component (B), the component (C), the hydraulic powder, the aggregate, the water, and the component used as needed is a mortar mixer. This can be done using a mixer such as a forced twin-screw mixer. Further, the mixture is preferably mixed for 1 minute or longer, more preferably 2 minutes or longer, and preferably 5 minutes or shorter, more preferably 3 minutes or shorter. In preparing the hydraulic composition, the materials and chemicals described in the hydraulic composition and their amounts can be used.
  • the obtained hydraulic composition is further filled with a hydraulic composition in a mold, centrifuged, and then cured and cured.
  • formwork include building formwork, formwork for concrete products, and the like.
  • the filling method into the mold include a method of directly charging from a mixer, a method of pumping a hydraulic composition with a pump, and a method of introducing the hydraulic composition into the mold.
  • the hydraulic composition When curing the hydraulic composition, it may be heat-cured to promote curing to promote curing.
  • the heat curing can promote the curing by holding the hydraulic composition at a temperature of 40 ° C. or higher and 90 ° C. or lower.
  • the present invention provides a method for producing a cured product of a hydraulic composition, which comprises the following steps.
  • Step 1 A step of mixing the component (A), the hydraulic powder, the aggregate, and water to obtain a hydraulic composition, and filling the mold with the obtained hydraulic composition.
  • Step 2 A step of applying centrifugal force to mold the hydraulic composition filled in the mold obtained in Step 1.
  • Step 3 A step of condensing the mold-clamped hydraulic composition obtained in Step 2 in a mold.
  • step 1 it is preferable to further mix the component (B). That is, step 1 is preferably a step of mixing the component (A), the component (B), the hydraulic powder, the aggregate, and water to obtain a hydraulic composition. In step 1, it is preferable to further mix the component (C). That is, step 1 is preferably a step of mixing the component (A), the component (B), the component (C), the hydraulic powder, the aggregate, and water to obtain a hydraulic composition.
  • Specific examples and preferred embodiments of the components (A), (B) and (C) used in the method for producing a cured product of the water-hard composition of the present invention are for the water-hard composition for centrifugation of the present invention, respectively. It is the same as that described in the dispersant composition. Further, specific examples and preferred embodiments of the water-hard powder and the aggregate used in the method for producing a cured product of the water-hard composition of the present invention are the same as those described in the water-hard composition for centrifugation of the present invention. ..
  • the hydraulic powder is used so that the W / P is within the range described in the hydraulic composition for centrifugation of the present invention.
  • the amount of aggregate used is also the same as that described in the water-hardening composition for centrifugation of the present invention.
  • step 1 of the method for producing a cured product of the water-hard composition of the present invention the content of each component and the mass ratio thereof described in the water-hard composition for centrifugal molding of the present invention are the contents of each component. It can be appropriately applied in place of a mixed amount.
  • the matters described in the dispersant composition for a water-hard composition for centrifugation of the present invention and a method for producing the same, the water-hard composition for centrifugation, and the method for producing a water-hard composition for centrifugation are the same as the water-hard composition of the present invention. It can be appropriately applied to a method for producing a cured product.
  • the method for producing a cured product of the present invention preferably includes the following steps 4 in addition to steps 1 to 3.
  • Step 4 A step of steam curing the hydraulic composition condensed in Step 3 in a mold.
  • the method for producing a cured product of the present invention can include the following steps 5 in addition to steps 1 to 4.
  • Step 5 After step 4, the step of cooling the hydraulic composition and removing it from the mold.
  • the method for producing a cured product of the present invention can include the following steps 6 in addition to steps 1 to 5.
  • Step 6 A step of curing the cured product of the hydraulic composition obtained in Step 5 at normal temperature and pressure.
  • step 1 a method in which a mixture containing water, a component (A), an arbitrary component (B), and an arbitrary component (C) is added to a mixture containing an aggregate and a hydraulic powder and mixed is water. Even when producing a rigid composition, it is preferable because it can be easily and uniformly mixed. Further, the addition of the component (A), the arbitrary component (B) and the arbitrary component (C) is preferably added using the dispersant composition for a water-hard composition for centrifugation of the present invention, and the centrifugation of the present invention is used.
  • a method of adding a mixture containing a dispersant composition for a water-hard composition for molding and water to a mixture containing an aggregate and a water-hard powder and mixing them is easily uniform even when producing a water-hard composition. It is preferable because it can be mixed with.
  • step 1 the hydraulic powder and the aggregate are mixed, and a mixture containing water, a component (A), an arbitrary component (B), and an arbitrary component (C) is obtained as described above.
  • step 1 the component (A), the optional component (B), and the optional component (C) can be separately added to water, hydraulic powder, and aggregate and mixed.
  • step 1 As a method of filling the mold with the obtained hydraulic composition in step 1, a method of discharging the hydraulic composition after kneading from the kneading means and manually putting it into the mold can be mentioned.
  • step 2 the hydraulic composition filled in the mold is molded by applying centrifugal force, but at this time, it is preferable to change the centrifugal force at least once.
  • the hydraulic composition can be molded by applying a centrifugal force that changes stepwise. That is, in step 2, the hydraulic composition can be molded by changing the centrifugal force at least once, and further, by applying a centrifugal force that changes stepwise and becomes larger stepwise. ..
  • step 2 it is preferable to mold the hydraulic composition filled in the mold with a centrifugal force of 0.5 G or more.
  • the centrifugal force of centrifugal molding is preferably 0.5 G or more, preferably 30 G or less, and more preferably 25 G or less. From the viewpoint of energy cost reduction and moldability, it is preferable to keep the centrifugal force in the range of 15 G or more, 30 G or less, and 25 G or less (also referred to as high centrifugal force) for 1 minute or more.
  • the compaction by centrifugal force is carried out, for example, with a centrifugal force of 0.5 G or more and 30 G or less, preferably 5 minutes or more, more preferably 7 minutes or more, further preferably 9 minutes or more, and preferably 40 minutes or less.
  • a centrifugal force of 20 G or more is preferably 1 minute or longer, more preferably 3 minutes or longer, still more preferably 5 minutes or longer, and preferably. Do it for 15 minutes or less.
  • a centrifugal force of 0.5 G or more and 30 G or less is preferably applied over 5 minutes or more, more preferably 7 minutes or more, further preferably 9 minutes or more, and preferably 40 minutes or less to form a hydraulic composition. You can mold things. Further, in step 3, compaction by holding a centrifugal force of 20 G or more can be carried out preferably for 1 minute or more, more preferably 3 minutes or more, further preferably 5 minutes or more, and preferably 15 minutes or less.
  • the compaction by centrifugal force can be performed in stages, and from the viewpoint of moldability, a method of gradually increasing the centrifugal force G is preferable. It can be carried out under the following step conditions until the desired centrifugal force is obtained. For example, in the case of five stages, in step 3, (1) the first stage, the initial speed is 0.5 G or more and less than 2 G, and the centrifugal force is more than 0 minutes and 15 minutes or less, and (2) the second stage, the second speed, is 2 G.
  • Centrifugal force of 5G or more and less than 5G for more than 0 minutes and 15 minutes or less (3) Third stage of third speed is more than 5G and less than 10G of centrifugal force for more than 0 minutes and less than 15 minutes, (4) Fourth stage of fourth speed A water-hard composition according to the conditions of a centrifugal force of 10 G or more and less than 20 G for more than 0 minutes and 15 minutes or less, and (5) a centrifugal force of 20 G or more and 30 G or less for the fifth stage, which is more than 0 minutes and 15 minutes or less. It is preferable to perform mold clamping.
  • step 3 the hydraulic composition obtained in step 2 is condensed. Specifically, aerial curing is performed for 3 to 4 hours after kneading.
  • step 4 the cured hydraulic composition in the mold obtained in step 3 is steam-cured.
  • steam curing is preferably performed at 40 ° C. or higher and 90 ° C. or lower, and more preferably 60 ° C. or higher and 90 ° C. or lower.
  • the ambient temperature of the mold filled with the hydraulic composition (hereinafter, also referred to as ambient temperature) is set to room temperature, preferably 10 ° C. or higher and 40 ° C. or lower, and is left for 1 hour or more and 4 hours or less before curing.
  • steam curing can be performed by setting the ambient temperature to 40 ° C. or higher and 90 ° C.
  • steps 4 and 5 can be continuously performed under a series of temperature controls.
  • the steam curing is carried out by holding the mold at a predetermined temperature for a certain period of time in a state where steam is applied around the mold filled with the hydraulic composition.
  • the period may be the period of steam curing.
  • step 4 the ambient temperature of the mold is raised to 60 ° C. or higher and 85 ° C. or lower at a heating rate of 10 ° C. or higher and 30 ° C. or lower per hour. Then, the temperature raised is maintained for 2 hours or more and 8 hours or less, and then, as step 5, the ambient temperature is cooled to room temperature, for example, 20 ° C. at a temperature lowering rate of 5 ° C. or more and 20 ° C. or less per hour, and the molded product is formed. Demold.
  • the rate of temperature rise is preferably 20 ° C. or less per hour from the viewpoint of suppressing a decrease in strength due to cracks in the cured product.
  • a mold filled with a water-hard composition is left to stand at an ambient temperature of room temperature, for example, 10 ° C. or higher and 30 ° C. or lower for 3 hours (pre-curing), and the temperature rises by 20 ° C. per hour.
  • the ambient temperature is raised to 70 ° C. or higher and 90 ° C. or lower at a temperature rate, and the temperature of 70 ° C. or higher and 90 ° C. or lower is maintained for 2 hours or longer and 6 hours or lower, and then at a temperature lowering rate of 10 ° C.
  • Examples thereof include a method in which the ambient temperature is cooled to room temperature, for example, 20 ° C. (step 4), and the molded product is demolded after being left at that temperature for 20 hours or more and 30 hours or less (step 5). Further, it is also possible to perform autoclave curing at about 180 ° C.
  • step 6 the cured product of the hydraulic composition obtained in step 5 is cured at normal temperature and pressure. Specifically, it is stored at 20 ° C. and atmospheric pressure.
  • the production method of the present invention includes steps 1 to 5, and the time from the start of preparation of the hydraulic composition to the demolding in step 5 is 8 hours or more and 30 hours or less. Examples thereof include a method for producing a cured product.
  • the start of preparation of the hydraulic composition is the time when the hydraulic powder and water first come into contact with each other.
  • the cured product of the hydraulic composition obtained by the method for producing a cured product of the present invention can be used as a centrifugally molded concrete product, and specific examples thereof include piles, poles, and hume pipes.
  • the cured product of the hydraulic composition obtained by the method for producing a cured product of the present invention is excellent in moldability of the hydraulic composition after a certain period of time (15 minutes or more and 60 minutes or less) has passed from kneading. In addition, there are few irregularities on the end face, the surface is excellent in appearance, and the inner surface of the product is finished smoothly, so that the obstacles of the cutting machine during pile driving and Nakabori method are improved.
  • Each polymer obtained is a sodium salt.
  • (A') component (comparative component of (A) component)
  • (A'-3): monomer (A1) / monomer (A2) / monomer (A3) methacrylic acid / methoxypolyethylene glycol (15
  • Example 1 and Comparative Example 1 (1) Concrete composition
  • W / P is the ratio (% by mass) of water / hydraulic powder
  • the amount of hydraulic powder is the total amount of cement (P 1 ) and inorganic early-strengthening agent (P 2 ).
  • the addition amount of the component (A), the component (B), and the component (C) is the addition amount (parts by mass) with respect to 100 parts by mass of the hydraulic powder, and is the addition amount of the solid content (effective component). is there.
  • the examples containing the component (A) have better moldability for a longer period of time than the comparative examples containing the component (A') instead of the component (A) or the component (A).
  • the component (A) and the component (B) are used in combination in the examples, better moldability is exhibited for a longer period of time as the ratio of the component (A) increases. It is considered that this is because the component (A) is intermittently adsorbed on the cement by the above mechanism, and the fluidity of the concrete is effectively maintained.
  • the example containing the component (B) in addition to the component (A) tends to require a smaller amount of addition in order not to cause molding defects as compared with the example using the component (A) alone. It is in. This is because the component (B) is superior to the component (A) in the fluidity immediately after kneading, so that the fluidity of the concrete is effectively maintained by the component (A) while reducing the total amount of addition. it is conceivable that.
  • the examples containing the component (C) in addition to the component (A) and the component (B) include the component (A) alone and the component (B) in addition to the component (A).
  • the compression strength (7-day strength) of the centrifuge molded product with a material age of 7 days tends to be excellent. It is considered that this is because the component (C) activates the hydration reaction of the hydraulic powder represented by cement and densifies the cured product structure.

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Abstract

L'invention concerne : une composition de dispersant pour des compositions hydrauliques destinées au moulage centrifuge, la composition de dispersant permettant à une composition hydraulique de présenter une meilleure aptitude au moulage pendant un temps prédéfini (par ex., 15 minutes à 60 minutes) grâce au malaxage ; son procédé de production ; une composition hydraulique destinée au moulage centrifuge qui présente une meilleure aptitude au moulage pendant un temps prédéfini (par ex., 15 minutes à 60 minutes) grâce au malaxage ; et un procédé de production d'un produit durci d'une composition hydraulique. Cette composition de dispersant pour compositions hydrauliques destinées au moulage centrifuge contient le constituant (A) suivant et de l'eau. Le constituant (A) est défini comme suit : un copolymère (A) contenant un monomère (A1) représenté par la formule générale (A1), un monomère (A2) représenté par la formule générale (A2), et un monomère (A3) représenté par la formule générale (A3) en tant que monomères constitutifs et ayant un poids moléculaire de 10 000 à 70 000, le monomère (A1) étant présent en une quantité de 30 % en moles à 70 % en moles des monomères constitutifs du copolymère, le monomère (A2) étant présent en une quantité de 10 % en moles à 50 % en moles, le monomère (A3) étant présent en une quantité de 20 % en moles à 35 % en moles.
PCT/JP2020/037114 2019-10-08 2020-09-30 Composition de dispersant pour compositions hydrauliques destinées au moulage centrifuge WO2021070699A1 (fr)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012171819A (ja) * 2011-02-18 2012-09-10 Nippon Shokubai Co Ltd セメント混和剤及びこれを含むセメント組成物
JP2014125509A (ja) * 2012-12-25 2014-07-07 Nippon Shokubai Co Ltd 共重合体およびその用途
JP2016113321A (ja) * 2014-12-15 2016-06-23 花王株式会社 水硬性組成物用分散剤
JP2018111623A (ja) * 2017-01-11 2018-07-19 株式会社日本触媒 セメント混和剤およびセメント組成物

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012171819A (ja) * 2011-02-18 2012-09-10 Nippon Shokubai Co Ltd セメント混和剤及びこれを含むセメント組成物
JP2014125509A (ja) * 2012-12-25 2014-07-07 Nippon Shokubai Co Ltd 共重合体およびその用途
JP2016113321A (ja) * 2014-12-15 2016-06-23 花王株式会社 水硬性組成物用分散剤
JP2018111623A (ja) * 2017-01-11 2018-07-19 株式会社日本触媒 セメント混和剤およびセメント組成物

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