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WO2025035453A1 - Dispersant à base de polycarboxylate - Google Patents

Dispersant à base de polycarboxylate Download PDF

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Publication number
WO2025035453A1
WO2025035453A1 PCT/CN2023/113542 CN2023113542W WO2025035453A1 WO 2025035453 A1 WO2025035453 A1 WO 2025035453A1 CN 2023113542 W CN2023113542 W CN 2023113542W WO 2025035453 A1 WO2025035453 A1 WO 2025035453A1
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Prior art keywords
group
formula
mol
mole fractions
dispersant
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Pending
Application number
PCT/CN2023/113542
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English (en)
Inventor
Qing Zhang
Yalei CHEN
Jiali ZHU
Jianghong Liu
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Sika Technology AG
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Sika Technology AG
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Priority to PCT/CN2023/113542 priority Critical patent/WO2025035453A1/fr
Priority to PCT/EP2024/073109 priority patent/WO2025037017A1/fr
Publication of WO2025035453A1 publication Critical patent/WO2025035453A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • C04B24/24—Macromolecular compounds
    • C04B24/26—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • C04B24/2641—Polyacrylates; Polymethacrylates
    • C04B24/2647—Polyacrylates; Polymethacrylates containing polyether side chains
    • 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
    • C04B24/2664—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds of ethylenically unsaturated dicarboxylic acid polymers, e.g. maleic anhydride copolymers
    • C04B24/267—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds of ethylenically unsaturated dicarboxylic acid polymers, e.g. maleic anhydride copolymers containing polyether side chains
    • 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
    • C04B28/04—Portland 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
    • C04B2103/40—Surface-active agents, dispersants
    • C04B2103/408—Dispersants

Definitions

  • the invention relates to a dispersant containing a polycarboxylate copolymer for hydraulically setting binder compositions, and its use for improving the early strength as well as a method for producing this dispersant.
  • Dispersants are used as plasticizers or water-reducing agents for hydraulically setting binder compositions, such as concrete, mortars, cements, plasters, and lime, for example.
  • the dispersants are generally organic polymers, which are added to the mixing water or admixed in solid form to the binder compositions. As a result, it is possible to advantageously modify not only the binder composition consistency during processing but also the properties in the cured state.
  • the copolymers include a structural unit derived from an unsaturated polyalkylene glycol ether monomer with a predetermined structure and a structural unit derived from an unsaturated carboxylic acid monomer.
  • the unsaturated polyalkylene glycol ether monomer can e.g. comprise an alkenyl group such as a vinyl group, an allyl group, a methallyl group, and a 3-methyl-3-butenyl group.
  • the unsaturated carboxylic acid monomer can be selected from unsaturated (di) carboxylic acid monomers such as e.g.
  • the copolymers can be produced by solvent or bulk copolymerization with a polymerization initiator. Typically, the copolymerization is effected using a chain transfer agent such as hypophosphites like sodium hypophosphite.
  • the first one is related to the insufficient early strength.
  • some additional functional monomers are usually needed in the polycarboxylic acid copolymers, which makes the reaction process more complex and energy consumptive.
  • such dispersants may be not very efficient in certain binder compositions.
  • dispersants which do not have or reduce the above mentioned drawbacks, especially showing further improved early strength and setting time performances as well as better water reduction and slump keeping performance, even with a reduced addition amount.
  • Such dispersants may be especially suitable for the mineral binder, in particular cement, preferably a Portland cement and the supplementary cementitious materials (SCM) such as limestone, slag, or pozzolanic binder.
  • SCM supplementary cementitious materials
  • the dispersants should be based on the polycarboxylic acid copolymers which may be prepared easily and need no additional functional monomers to enhance the early strength.
  • the present invention also provides a method for preparation of the new dispersants and the mineral binder composition containing such dispersants.
  • a first aspect of the invention relates to a dispersant for mineral binder compositions, which contains a copolymer comprising or consisting of:
  • M independently of one another represents H + , an alkali metal ion, alkaline earth metal ion, a bivalent or trivalent metal ion, an ammonium ion or an organic ammonium group,
  • each R u independently of one another stands for hydrogen or a methyl group
  • each R v independently of one another stands for hydrogen or COOM
  • R 5 , R 6 , and R 7 in each case independently of one another, are H or an alkyl group with 1 –5 carbon atoms, in particular H;
  • R 8 in each case independently of one another, is a group of the formula - [AO] n -R a , where
  • A is independently of one another C 2 -to C 4 -alkylene
  • R a is H, a C 1 to C 20 alkyl, cycloalkyl or alkylaryl group, and
  • n is an integer such that the number average molecular weight (M n ) of the group - [AO] n -R a is more than 4'900 g/mol, especially more than 5’200 g/mol, in particular more than 5'700 g/mol;
  • z 0, 1 or 2;
  • a/b/c (0.1 –0.99) / (0.01 –0.9) / (0 –0.8) , preferably
  • Another aspect of the invention relates to a method for producing the dispersant as described above.
  • a still another aspect of the invention relates to a mineral binder composition
  • a mineral binder composition comprising a dispersant as described above and a mineral binder, in particular cement, preferably a Portland cement and the supplementary cementitious materials (SCM) such as limestone, slag, or pozzolanic binder.
  • SCM supplementary cementitious materials
  • the dispersant based on the copolymer as defined above may significantly improve the early strength and also result in the short setting time in the mineral binder compositions in particular containing cement, preferably a Portland cement and the supplementary cementitious materials (SCM) .
  • cement preferably a Portland cement and the supplementary cementitious materials (SCM) .
  • SCM supplementary cementitious materials
  • sequence of the structural subunits S1, S2, and S3 in the copolymer may be alternating, block-like or random. It is also possible, moreover, for there to be further structural subunits in addition to the structural subunits S1, S2, S3 and S4.
  • the structural subunits S1, S2, S3 and S4 together preferably have a weight fraction of at least 50 wt%, more particularly at least 90 wt%, very preferably at least 95 wt%or at least 99 wt%, of the total weight of the copolymer. Even more preferred, the structural subunits S1, S2 and S4 together have a weight fraction of at least 50 wt%, more particularly at least 90 wt%, very preferably at least 95 wt%or 99 wt. %, or even 100 wt.%of the total weight of the copolymer.
  • copolymers with R u and R v being hydrogen or methyl and M being H + or an alkali metal ion.
  • Such kind of copolymers can be produced starting from (meth) acrylic acid or salts thereof.
  • A is independently of one another C 2 -to C 4 -alkylene, meaning that A may be independently any selected from C 2 -, C 3 -or C 4 -alkylene in case of single or multiple occurrences.
  • Copolymers of these kinds can be prepared, for example, starting from ethylene glycol vinyl ethers (EPEG) .
  • Copolymers of these kinds can be prepared, for example, starting from ethylene glycol vinyloxybutyl ethers (VPEG) .
  • VPEG ethylene glycol vinyloxybutyl ethers
  • a proportion of ethylene oxide units or C 2 -alkylene oxide units in the group of the formula - [AO] n -R a is more than 90 mol %, especially more than 95 mol %, preferably more than 98 mol %, in a particular 100 mol %. This is in particular advantageous if air entrainment by the copolymers shall be reduced.
  • copolymers comprising higher proportions of C 3 -and or C 4 -alkylene oxide units in the groups of the formula - [AO] n -R a might be suitable as well.
  • the integer of n such that the number average molecular weight (M n ) of the group - [AO] n -R a is more than 4'900 g/mol, especially more than 5’ 200 g/mol, in particular more than 5'700 g/mol.
  • the integer of n may be selected such that the number average molecular weight (M n ) of the group - [AO] n -R a is less than 10’ 000, preferably less than 8’ 000. Therefore, in one advantageous embodiment, the integer of n may be an integer larger than 105, such as 110 or 115 or 120 or 130 and preferably less than 240, such as 235, 225, 210, 200, 190 and 185.
  • the weight-average molecular weight (M w ) and the number-average molecular weight (M n ) are determined presently by gel permeation chromatography (GPC) using polyethylene glycol (PEG) as a standard. This technique is known per se to the person skilled in the art.
  • the ratio of the mole fraction a/b is required to be more than 3.2, preferably more than 3.6 or 4.0 or 4.5.
  • the upper limit of a/b it depends on the preparation and synthesis of the copolymer and may be such as below 13.0, preferably below 12.0 or such as below 11.0 or 9.5 or 8.0. It has been found that the properties in terms of slump, air content and setting time may be probably inclined to be insufficient if the ratio of a/b is less than 3.2.
  • the copolymer preferably has a mean molecular weight M n of 500 –200'000 g/mol, especially 5'000 –70'000 g/mol, in particular 15'000 –50'000 g/mol.
  • the copolymer comprises a further structural subunit S3.
  • the further structural units typically are units arising by polymerization of ethylenically unsaturated compounds, in particular ethylenically unsaturated carboxylic acids or derivatives thereof, particularly salts, anhydrides, esters, or amides thereof.
  • the properties of the copolymer can e.g. be adapted to special applications.
  • the further structural subunit S3 can e.g. be present with a proportion of >0 –50 mole %, especially >0 –30 mole %, in particular >0 –10 mole %, especially 0.0001 –5 mole %, in particular 0.001 –2 mole %, with respect to the sum of the structural units S1, S2, S3 and S4 of the copolymer.
  • the further structural subunit S3 may be also absent in the copolymer.
  • Examples of further structural subunit S3 are units arising by polymerization of hydroxy alkyl (meth) acrylate in which alkyl may refer to C1-C8 or C2-C6 alkyl, like hydroxy ethyl (meth) acrylate, maleic acid, mesaconic acid, citraconic acid, glutaconic acid, fumaric acid, maleamic acid, itaconic acid, vinylbenzoic acid, crotonic acid, or anhydrides of the aforementioned acids or derivatives thereof, particularly the salts, anhydrides, esters, or amides thereof, preferably hydroxy alkyl (meth) acrylate like hydroxy ethyl (meth) acrylate.
  • the copolymer has less than 2 mol %of structural subunit S3, especially less than 1 mol %structural subunit S3, particularly no structural subunit S3.
  • Such kind of copolymers can be produced in a highly efficient and economic manner and at the same time show very good plasticizing effects in in various and different mineral binder systems.
  • the copolymer of the invention usually contains a subunit S4 derived from the chain transfer agent which comprises unsaturated alkyl sulfonate (S) , hypophosphite (H) , and/or mercapto-group containing aliphatic acid (M) ; preferably hypophosphite (H) ; more preferably sodium or kalium hypophosphite.
  • the unsaturated alkyl sulfonate includes usually a C-C unsaturated group like vinyl group in the molecule, such as allyl sulfonate or methallyl sulfonate.
  • the mercapto-group containing aliphatic acid may be represented by the formula HS-R’-COOH, wherein R’ denotes a divalent aliphatic group such as alkylene group having 1-8, preferably 1-6 carbon atoms.
  • R’ denotes a divalent aliphatic group such as alkylene group having 1-8, preferably 1-6 carbon atoms.
  • the suitable examples thereof may include mercapto propionic acid or mercapto acetic acid, preferably mercapto propionic acid.
  • the hypophosphite is usually used as a chain transfer agent in the free radical polymerization of a polycarboxylate polymer. It includes the hypophosphites of an alkali metal such as sodium or potassium. One preferred hypophosphite is sodium hypophosphite.
  • the copolymer is produced by free radical polymerization. Thereby the copolymer forms by the successive addition of free-radical building blocks. Thereby, the free-radical building blocks may be added in alternating, block-like or random manner.
  • the copolymer is produced in a polymerization reaction at a temperature of 10°C to 50°C, preferably of 15°C to 35°C.
  • such kind of copolymers can have a highly uniform distribution of structural subunits S1, S2 and if present S3.
  • the copolymer is obtained by a polymerization reaction which takes place in the presence of an initiator for free radical polymerization.
  • the initiator preferably is a redox system-based initiator.
  • the initiator comprises a peroxide and a reducing agent.
  • the reducing agent especially comprises a sulfinic acid derivate and/or a metal salt.
  • the reducing agent comprises hydroxymethylsulfinate salt and/or an iron salt, preferably a sodium hydroxymethylsulfinate and an iron (II) salt, e.g. iron sulfate.
  • the peroxide is in particular hydrogen peroxide.
  • the copolymer is obtained in a polymerization reaction which takes place in absence of peroxydisulfates and/or persulfates.
  • a further aspect of the present invention is related to a method for producing the dispersant as described above, in particular a copolymer as described above, comprising the step of polymerizing:
  • R u , R v , M, R, R 5 , R 6 , R 7 , R 8 , and z are defined as described above in connection with the copolymer and where a', b', and c' are mole fractions of the respective structural subunits S1', S2', an S3', where
  • a'/b'/c' (0.1 –0.99) / (0.01 –0.9) / (0 –0.8) , preferably
  • a compound S1' of the formula (III) may be an acrylic acid or a methacrylic acid.
  • a compound S2' of the formula (IV) may be polyethylene glycol vinyl ether (EPEG) , polyethylene glycol monomethallyl ether (HPEG) , isopentenyl polyethylene glycol (TPEG) , or polyethylene glycol vinyl oxybutyl ethers (VPEG) ; preferably polyethylene glycol vinyl ether (EPEG) .
  • EPEG and VPEG are structurally different from polyethylene glycol monomethallyl ether (HPEG) , isopentenyl polyethylene glycol (TPEG) or isobutenyl polyethylene glycol (IPEG) which are usually used in the synthesis of polycarboxylate dispersant and may result in the better effects in terms of the slump, air content and setting time.
  • HPEG polyethylene glycol monomethallyl ether
  • TPEG isopentenyl polyethylene glycol
  • IPEG isobutenyl polyethylene glycol
  • the copolymer is prepared by polymerizing (meth) acrylic acid and EPEG wherein a chain transfer agent as described above is added along with other optional additives like initiators.
  • the copolymer is produced by free radical polymerization.
  • the copolymer forms by the successive addition of free-radical building blocks.
  • the free-radical building blocks may be added in alternating, block-like or random manner.
  • the polymerization takes place at a temperature 10°C to 50°C, preferably of 15°C to 35°C.
  • the polymerization takes place in the presence of an initiator for free radical polymerization.
  • the initiator preferably is a redox system-based initiator.
  • the initiator comprises a peroxide and a reducing agent.
  • the reducing agent especially comprises a sulfinic acid derivate and/or a metal salt.
  • the reducing agent comprises hydroxymethylsulfinate salt and/or an iron salt, preferably a sodium hydroxymethylsulfinate and an iron (II) salt, e.g. iron sulfate.
  • the peroxide is in particular hydrogen peroxide.
  • the chain transfer agent is used in a proportion of 1 –5 wt. -%, especially 2 –3 wt. -%, with respect to the total weight of the compounds S1', S2', and S3' or the structural units S1, S2 and S3, respectively.
  • Another aspect of the present invention is related to a mineral binder composition
  • a mineral binder composition comprising a copolymer as described above and a hydraulically setting binder, in particular cement.
  • the mineral binder composition comprises at least one mineral binder.
  • mineral binder refers more particularly to a binder which reacts in the presence of water, in a hydration reaction, to give solid hydrates or hydrate phases. This may be, for example, a hydraulic binder (e.g., cement or hydraulic lime) , a latent hydraulic binder (e.g., slag) , a pozzolanic binder (e.g., flyash) , or a nonhydraulic binder (gypsum or white lime) .
  • a hydraulic binder e.g., cement or hydraulic lime
  • latent hydraulic binder e.g., slag
  • a pozzolanic binder e.g., flyash
  • nonhydraulic binder gypsum or white lime
  • the mineral binder or the binder composition comprises more particularly a hydraulic binder, preferably cement.
  • Cements are composed of main constituents, usually additionally of calcium sulfate (gypsum and/or hemihydrate and/or anhydrite) and optionally of secondary constituents and/or cement additives such as grinding aids.
  • Main constituents are used in quantities of more than 5%by weight.
  • the main constituents can be Portland cement clinker, also referred to as clinker, slag sand, natural or synthetic pozzolans, fly ash, for example, siliceous or calcareous fly ash, burnt shale, limestone and/or silica fume.
  • the cements can contain up to 5%by weight of finely divided inorganic, mineral substances, which originate from the clinker production, for example, raw meal, or correspond to the other main constituents.
  • the cement for the preparation of the mineral binder composition according to the invention, can be any conventional cement, for example, one in accordance with the five main cement types according to DIN EN 197-1: namely, Portland cement (CEM I) , Portland composite cements (CEM II) , blast-furnace cement (CEM III) , pozzolan cement (CEM IV) and composite cement (CEM V) .
  • CEM I Portland cement
  • CEM II Portland composite cements
  • CEM III blast-furnace cement
  • pozzolan cement CEM IV
  • composite cement CEM V
  • the mineral binder or the binder composition comprises preferably cement, preferably a Portland cement and the supplementary cementitious materials (SCM) such as limestone, slag, fly ash or pozzolanic binder.
  • SCM supplementary cementitious materials
  • the cement for which the inventive dispersant is especially suitable may be the Portland cement, for example as defined in the China standard GB 175-2020.
  • a hydraulic binder suitable for the invention may comprise (in each case relative to the total dry weight of hydraulic binder) , in addition to the inventive copolymer as described above as the dispersant,
  • a hydraulically setting binder composition of the present invention may comprise (wt. -%are relative to the total dry weight of the composition unless otherwise indicated) , in addition to the inventive copolymer as described above as the dispersant,
  • sulfate source in a dosage that will result in an amount of 0.75 –8 wt. -%of sulfate, preferably 1.5 –5 wt. -%of sulfate, in each case relative to the combined dry weight of the steel making slag and the silica source,
  • an additive selected from the group consisting of alkanolamines, reducing agents, sugars, sugar acids, carboxylic acids or their salts, amino acids or their salts, mineral salts, or mixtures thereof, in a dosage that will result in an amount of 0.05 –10 wt. -%, preferably of 0.1 –5 wt. -%of the additive, relative to the dry weight of steel making slag.
  • a binder composition may comprise, in addition to the inventive copolymer as described above as the dispersant, a mixture of
  • the mass ratios of calcined clay (CC) , limestone (L) , and Portland cement (P) are as follows:
  • P : CC is from 33 : 1 to 1 : 1, preferably from 8 : 1 to 1 : 1,
  • CC : L is from 10 : 1 to 1 : 33, preferably from 5 : 1 to 1 : 10, and
  • P : L is from 20 : 1 to 1 : 4, preferably from 5 : 1 to 1 : 1.
  • a binder composition consists of a mixture of
  • the mineral binder composition additionally contains solid aggregates, especially gravel, sand and/or aggregates.
  • solid aggregates especially gravel, sand and/or aggregates.
  • Corresponding compositions can be used, for example, as mortar mixtures or concrete mixtures.
  • common components such as other concrete plasticizers, for example lignosulfonates, sulfonated naphthalene-formaldehyde condensates, sulfonated melamine-formaldehyde condensates, or polycarboxylate ethers which are chemically different from the copolymers of the present invention, accelerators, corrosion inhibitors, retardants, shrinkage reducing agents, antifoaming agents, or pore formers may be present in the mineral binder composition.
  • other concrete plasticizers for example lignosulfonates, sulfonated naphthalene-formaldehyde condensates, sulfonated melamine-formaldehyde condensates, or polycarboxylate ethers which are chemically different from the copolymers of the present invention, accelerators, corrosion inhibitors, retardants, shrinkage reducing agents, antifoaming agents, or pore formers may be present in the mineral binder composition.
  • a mineral binder composition is more particularly a processable and/or aqueous mineral binder composition.
  • the mineral binder composition is preferably a mortar composition, a concrete composition or a gypsum composition.
  • the mineral binder composition is more particularly a mineral binder composition which is processable and/or is mixed with water.
  • a weight ratio of water to binder in the mineral binder composition is preferably in the range of 0.25 –0.7, more particularly 0.26 –0.65, preferably 0.27 –0.60, especially 0.28 –0.55.
  • the copolymer is used advantageously with a fraction of 0.01 –10 wt%, more particularly 0.1 –7 wt%or 0.2 –5 wt%, based on the binder content.
  • Another aspect of the present invention is related to a molding obtainable by curing a binder composition as described above after addition of water.
  • These moldings may in principle be shaped in any way and may be part of a construction, for example, a building, a traffic way or a bridge.
  • a first premixture 60 g water, 14 g NaOH (32%) , and 30 g acrylic acid
  • a third premixture (20 g water and 1.2 g Rongalite) were slowly dropped into the reaction vessel along with 0.75g Fe (II) under agitation. Agitation continued until a peroxide test was negative.
  • copolymers P1 to P3, P5 and PC14 have been produced similarly as copolymer P1 as described above and they are listed in the following table 1:
  • EPEG-6000 Mn of the group - [AO] n -R a in side chain of EPEG polymer is about 6000
  • HPEG-4000 Mn of the group - [AO] n -R a in side chain of HPEG polymer is about 4000
  • Concrete or mortar were prepared by mixing the specified amounts of Portland cement (Onoda P.O. 52.5 or Hailuo P.O 52.5) , fly ash, slag, sand and gravel (5-25 mm) and a certain amount of water to adjust the W/C ratio of 0.34.
  • the respective copolymers were formulated to solid content of 20%and then added to the mixture in the amounts indicated in the tables below, the stated amounts being in each case relative to the weight of the cement and fly ash.
  • the slump flow was determined according to standard GB/T 50080-2016.
  • the slump was measured according to standard GB/T 50080-2016.
  • the setting time of the concrete mixture was measured according to GB-T50080-2016.
  • Compressive strength was determined according to standard GB/T 50081-2019.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

L'invention concerne un dispersant pour compositions de liant minéral, qui contient un copolymère comprenant ou consistant en a) des fractions molaires d'une sous-unité structurale S1 de formule (I) b) b fractions molaires d'une sous-unité structurale S2 de formule (II) c) éventuellement, c fractions molaires d'une autre sous-unité structurale S3 dérivée d'autres comonomères, Ru, Rv, M, R, R5, R6, R7, R8 et z, étant tels que définis dans la description. L'invention concerne également un procédé de production de tels dispersants, une composition de liant à prise hydraulique le comprenant.
PCT/CN2023/113542 2023-08-17 2023-08-17 Dispersant à base de polycarboxylate Pending WO2025035453A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/CN2023/113542 WO2025035453A1 (fr) 2023-08-17 2023-08-17 Dispersant à base de polycarboxylate
PCT/EP2024/073109 WO2025037017A1 (fr) 2023-08-17 2024-08-16 Dispersant à base de polycarboxylate

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PCT/CN2023/113542 WO2025035453A1 (fr) 2023-08-17 2023-08-17 Dispersant à base de polycarboxylate

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PCT/EP2024/073109 Pending WO2025037017A1 (fr) 2023-08-17 2024-08-16 Dispersant à base de polycarboxylate

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Publication number Priority date Publication date Assignee Title
WO2005075529A2 (fr) * 2004-02-04 2005-08-18 Construction Research & Technology Gmbh Copolymeres a base de derives d'acide mono- ou dicarboxylique insatures et d'alcenylethers d'oxyalkyleneglycol, procede pour les produire et leur utilisation
WO2010066470A1 (fr) * 2008-12-08 2010-06-17 Construction Research & Technology Gmbh Procédé de fabrication de copolymères
CN110229283A (zh) * 2018-09-28 2019-09-13 镇江苏博特新材料有限公司 一种碱性条件下常温制备聚羧酸减水剂的方法
CN115504703A (zh) * 2022-10-14 2022-12-23 安徽瑞和新材料有限公司 一种用于聚羧酸系减水剂的混凝土抗离析剂及其制备方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005075529A2 (fr) * 2004-02-04 2005-08-18 Construction Research & Technology Gmbh Copolymeres a base de derives d'acide mono- ou dicarboxylique insatures et d'alcenylethers d'oxyalkyleneglycol, procede pour les produire et leur utilisation
WO2010066470A1 (fr) * 2008-12-08 2010-06-17 Construction Research & Technology Gmbh Procédé de fabrication de copolymères
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