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
  • C04B16/00—Use of organic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of organic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
  • C04B16/04—Macromolecular compounds
• • 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
  • C04B24/28—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
  • C04B24/281—Polyepoxides
• • 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
  • C04B40/0028—Aspects relating to the mixing step of the mortar preparation
  • C04B40/0039—Premixtures of ingredients
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G65/00—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule
  • C08G65/02—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring
  • C08G65/04—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring from cyclic ethers only
  • C08G65/22—Cyclic ethers having at least one atom other than carbon and hydrogen outside the ring
  • C08G65/24—Epihalohydrins
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G65/00—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule
  • C08G65/02—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring
  • C08G65/26—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring from cyclic ethers and other compounds
  • C08G65/2618—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring from cyclic ethers and other compounds the other compounds containing nitrogen
  • C08G65/2621—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring from cyclic ethers and other compounds the other compounds containing nitrogen containing amine groups
  • C08G65/2624—Macromolecular compounds obtained by reactions forming an ether link in the main chain of the macromolecule from cyclic ethers by opening of the heterocyclic ring from cyclic ethers and other compounds the other compounds containing nitrogen containing amine groups containing aliphatic amine groups
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L55/00—Compositions of homopolymers or copolymers, obtained by polymerisation reactions only involving carbon-to-carbon unsaturated bonds, not provided for in groups C08L23/00 - C08L53/00
• • 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
• • 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
  • C04B28/14—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
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L33/00—Compositions of homopolymers or 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 of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
  • Y02W30/00—Technologies for solid waste management
  • Y02W30/50—Reuse, recycling or recovery technologies
  • Y02W30/91—Use of waste materials as fillers for mortars or concrete

Definitions

• the present invention relates to a gypsum dispersant added for the purpose of improving the fluidity of a gypsum slurry composed of gypsum and water when producing various gypsum molded products such as gypsum board.
• Gypsum board is widely used as an interior material for buildings, because it has excellent fireproof, soundproof, and heat insulation properties and is inexpensive.
• Gypsum board is generally manufactured by a casting method.
• a gypsum slurry consisting of calcined gypsum, water, a dispersant, and other additives and foamed foam are stirred and mixed in a mixer, and then poured into a base paper and sandwiched. And after adjusting the width, it is obtained by curing, cutting and drying.
• plasterboard such as ordinary board, hard board, reinforced board, and decorative board. Depending on the required characteristics of each board, the type of additive, blending amount, addition of reinforcing material, etc. can be changed. Is the same.
• the dispersant used in the above gypsum slurry preparation is used for the purpose of increasing the malleability of the gypsum board to the base paper.
• the unit moisture content during slurry preparation is reduced, the drying efficiency is increased, and the density of the molding board is increased. It is also used for the purpose of obtaining a strength board.
• a dispersant for gypsum naphthalene sulfonate formaldehyde condensate, melamine sulfonate formaldehyde condensate, and formaldehyde condensate of bisphenol and aminobenzene sulfonic acid are widely used. (See Patent Document 1 and Patent Document 2).
• Patent Document 3 proposes to make a self-leveling gypsum aqueous composition having a high flow value and excellent self-leveling properties by including a polycarboxylic acid-based dispersant in the gypsum aqueous composition. Yes.
• Patent Document 4 includes a structural unit containing a nitrogen atom selected from an amide group, an amino group and an imino group, a structural unit having a carboxylic acid group, and a structural unit having a polyalkylene glycol group, and is obtained by polymerization.
• a gypsum dispersant characterized by comprising the water-soluble amphoteric polymer compound as a main component has been proposed. However, the effect may not be stably exhibited due to the influence of impurities contained in the raw material gypsum, and improvement has been demanded.
• the polycarboxylic acid-based dispersants proposed so far can exhibit excellent dispersion performance with respect to gypsum slurry by appropriately selecting the use conditions such as pH, but at the same time delay the curing. As a result, it has a problem of reducing the productivity of gypsum board.
• raw materials for gypsum are diverse and separated from by-products such as imported natural gypsum, flue gas desulfurization gypsum discharged from power plant and smelter desulfurization equipment, gypsum phosphate phosphate, gypsum hydrofluoric acid gypsum, and waste gypsum board. Collected recycled plaster is used for each factory for the purpose of reducing transportation costs.
• the impurities contained in gypsum differ from factory to factory, and as a result, the performance of the water reducing agent for gypsum cannot be fully exhibited.
• the present invention has been made in view of the above circumstances, and the problem to be solved is excellent in the improvement effect of the fluidity of the gypsum slurry even when raw gypsum having different quality is used, and It is an object of the present invention to provide a gypsum dispersant and a gypsum additive that do not cause a set delay.
• the present invention contains (A) a polycarboxylic acid polymer and (B) a polymer obtained by reacting alkylene diamines and / or monoamines with epihalohydrin as essential components. It relates to a dispersant for gypsum.
• the present invention also relates to an additive for gypsum comprising a polymer obtained by reacting alkylene diamines and / or monoamines with epihalohydrin as essential components, which is blended for the purpose of improving flowability of gypsum slurry. .
• the dispersant for gypsum of the present invention uses (A) a polycarboxylic acid polymer and (B) a reaction product of an alkylenediamine and an epihalohydrin, so that even if a raw material gypsum having different quality is used, Sufficient fluidity can be stably imparted regardless of the type. And a gypsum board can be manufactured, without reducing productivity by containing the said dispersing agent for gypsum in a gypsum slurry.
• the (A) polycarboxylic acid polymer has a structural unit derived from the polyalkylene glycol unsaturated monomer (a) and a structural unit derived from the unsaturated carboxylic acid monomer (b).
• a polymer can be preferably used.
• the structural unit derived from the polyalkylene glycol unsaturated monomer (a) can be represented by the following general formula (2).
• R 6 , R 7 , R 8 and R 9 each independently represents a hydrogen atom or a hydrocarbon group having 1 to 22 carbon atoms, and X represents —COO— or — (CH 2 ) a O—
• A represents an integer of 1 to 20.
• AO represents an alkyleneoxy group having 2 to 4 carbon atoms, and n represents an added mole number of the alkyleneoxy group and represents a number of 1 to 200.
• R 6, R 7, R 8, R 9 each independently represents a hydrogen atom or a hydrocarbon group having a carbon number of 1 to 22, preferably to hydrogen or C 1 -C 8 More preferably a hydrogen atom, a methyl group, an ethyl group, a propyl group or a butyl group.
• AO represents an alkyleneoxy group having 2 to 4 carbon atoms, and specific examples include an ethyleneoxy group, a propyleneoxy group, and a butyleneoxy group. When composed of two or more types of alkyleneoxy groups, these alkyleneoxy groups may be either block addition or random addition.
• n represents a number of 1 to 200 in terms of the number of added moles of the alkyleneoxy group. Preferably it is 5 to 120, more preferably 10 to 100, still more preferably 40 to 100.
• polyalkylene glycol unsaturated monomer (a) examples include the following. Methoxy polyethylene glycol mono (meth) acrylate, methoxy ⁇ polyethylene glycol (poly) propylene glycol ⁇ mono (meth) acrylate, ethoxypolyethylene glycol mono (meth) acrylate, ethoxy ⁇ polyethylene glycol (poly) propylene glycol ⁇ mono (meth) acrylate, Propoxy polyethylene glycol mono (meth) acrylate, propoxy ⁇ polyethylene glycol (poly) propylene glycol ⁇ mono (meth) acrylate, butoxy polyethylene glycol mono (meth) acrylate, butoxy ⁇ polyethylene glycol (poly) propylene glycol ⁇ mono (meth) acrylate, etc.
• (meth) acrylate refers to both acrylate and methacrylate
• (meth) allyl alcohol refers to both allyl alcohol and methallyl alcohol.
• unsaturated carboxylic acid monomer (b) examples include acrylic acid, methacrylic acid, maleic acid, fumaric acid, itaconic acid and unsaturated fatty acids, and acid anhydrides thereof such as maleic anhydride. To express. Of these, methacrylic acid is particularly preferred.
• examples of the copolymerizable monomer (c) other than the monomers (a) and (b) include the following known monomers; (1) (Non) aqueous monomers: methyl (meth) acrylate, ethyl (meth) acrylate, butyl (meth) acrylate, styrene, etc .; (2) anionic monomers: vinyl sulfonate, styrene sulfone Acid salts, methacrylic acid phosphates, etc .; (3) Amide monomers: Acrylamide, alkylene oxide adducts of acrylamide, etc. (4) Polyamide polyamine monomers: Condensation of polyamide polyamine and (meth) acrylic acid A compound in which alkylene oxide is added to the product as necessary.
• the method for producing the (A) polycarboxylic acid polymer is not particularly limited, and for example, a known polymerization method such as solution polymerization or bulk polymerization using a polymerization initiator can be used.
• the molecular weight is not particularly limited, but is preferably in the range of 5,000 to 100,000 in terms of weight average molecular weight (gel permeation chromatography method, converted to polyethylene glycol) from the viewpoint of good dispersibility expression.
• the (A) polycarboxylic acid polymer is preliminarily partially neutralized or completely neutralized with a neutralizing agent such as lithium hydroxide, potassium hydroxide, sodium hydroxide, ammonia, alkylamine, or organic amines. It is preferable that it is contained in the dispersing agent for gypsum of this invention as a made form.
• R 1 and R 2 represent an alkyl group having 1 to 5 carbon atoms or a hydroxyalkyl group having 1 to 4 carbon atoms
• R 3 and R 4 represent a hydrogen atom or an alkyl having 1 to 5 carbon atoms.
• R 5 represents an alkylene group having 2 to 6 carbon atoms.
• the monoamines include methylamine, dimethylamine, ethylamine, diethylamine, n-propylamine, di-n-propylamine, isopropylamine, diisopropylamine, n-butylamine, di-n-butylamine, and s-butylamine.
• Monoamines having an alkyl group such as dis-butylamine, t-butylamine, di-t-butylamine, hexylamine, dihexylamine, cyclohexylamine, dicyclohexylamine, 2-ethylhexylamine, di (2ethylhexyl) amine, allylamine, diallylamine, etc.
• Monoamines having various alkenyl groups monoethanolamine, diethanolamine, hydroxypropylamine, dihydroxypropylamine, N-methylethanolamine, aminobenzoate
• Monoamines having a hydroxyalkyl group such as an acid, aniline, monoamines having a phenyl group of diphenylamine, benzylamine, monoamines having benzyl group dibenzylamine and the like, ammonia and the like.
• the above alkylene diamines and monoamines may be used by selecting one or two or more from either one, or may be used by selecting one or two or more from both.
• examples of the epihalohydrin include epichlorohydrin, epibromohydrin, methyl epichlorohydrin, and the like, and these can be used alone or in combination of two or more. Of these epihalohydrins, epichlorohydrin is most preferred.
• the reaction molar ratio of the alkylene diamines and / or monoamines to epihalohydrin is preferably in the range of 2: 1 to 1: 2.
• the resulting polymer has a molecular weight with an appropriate viscosity, and good dispersibility is obtained.
• the weight average molecular weight of the polymer is usually 1,000 to 1,000,000, preferably 2,000 to 500,000, more preferably 3,000 to 100,000.
• component (B) is selectively adsorbed on impurities in the raw gypsum that inhibits the function of the dispersant. I guess that. Accordingly, with component (B) as an additive for gypsum, dispersants other than component (A), such as lignin sulfonate, naphthalene sulfonate formalin high condensate salt, melamine sulfonate formalin high condensate salt, polystyrene sulfonate It can also be used with a water-soluble vinyl copolymer.
• dispersants other than component (A) such as lignin sulfonate, naphthalene sulfonate formalin high condensate salt, melamine sulfonate formalin high condensate salt, polystyrene sulfonate It can also be used with a water-soluble vinyl copolymer.
• the gypsum dispersant of the present invention can be used by adding 0.01 to 5% by mass (dispersant solid content mass ratio) to the raw material gypsum.
• dispersant There are various methods of adding the dispersant, but a method of preparing a gypsum slurry by diluting and adding to water before kneading with gypsum is common.
• (A) component and (B) component may be mixed and added previously, and you may add separately, without mixing. When adding separately, the addition order may be any.
• Examples of gypsum include anhydrous gypsum, hemihydrate gypsum, and dihydrate gypsum.
• raw material gypsum natural gypsum, chemical gypsum such as neutralized gypsum or by-product gypsum, or a mixture of two or more types thereof can be used.
• main chemical gypsum include phosphate gypsum, hydrofluoric acid gypsum, titanium gypsum, and flue gas desulfurization gypsum.
• the raw gypsum may include recycled gypsum.
• the recycled gypsum may be any recycled gypsum that is recovered from waste gypsum board generated by a gypsum board manufacturer, waste gypsum board generated at the time of new construction or dismantling, and the like.
• the dispersant for gypsum of the present invention can be suitably used for any of these raw material gypsums, and excellent effects can be obtained for those blended at various ratios.
• Additives used for gypsum board etc. together with the gypsum dispersant of the present invention include general-purpose water reducing agents, foaming agents such as alkyl sulfates, alkyl ether sulfates, alkyl sulfonates, antifoaming agents, foam stabilizers, There are curing regulators, water repellents, adhesives, retarders, etc., and glass fibers, carbon fibers, waste paper, virgin pulp, etc. are added as reinforcing fibers, or gypsum with lightweight aggregates such as perlite and foamed steel Boards are also made. Note that the dispersant of the present invention can also be easily applied to plaster for plaster used for coating finish.
• copolymerization ratio and mixing ratio are based on mass unless otherwise indicated.
• (A) Polycarboxylic acid polymer The (A) polycarboxylic acid polymer used in this example is shown below.
• Synthesis example 1 A four-necked flask was charged with 116 g (1 mol) of N, N, N ′, N′-tetramethylethylenediamine and 171 g of water and mixed well. Subsequently, 94 g (0.9 mol) of 35% hydrochloric acid was gradually added at 40 ° C. or lower to prepare an amine hydrochloride. Thereafter, the temperature was raised to 70 ° C., and 83.3 g (0.9 mol) of epichlorohydrin was added dropwise over about 2 hours. During this time, the temperature was maintained at 70-80 ° C. After the epichlorohydrin was dropped, the reaction was continued for 6 hours at the same temperature to obtain a 50% by mass aqueous solution of polymer B1. The weight average molecular weight of the obtained polymer was 223,000.
• Synthesis example 2 In the same manner as in Synthesis Example 1, 190 g (1 mol) of N, N-dimethyl-N ′, N′-dihydroxyethylpropylenediamine and 88 g (0.95 mol) of epichlorohydrin were reacted to obtain 50 of polymer B2. A mass% aqueous solution was obtained. The weight average molecular weight of the obtained polymer was 125,000.
• Synthesis example 3 In the same manner as in Synthesis Example 1, 236 g (1 mol) of N, N, N ′, N′-tetrahydroxyethylethylenediamine was reacted with 92.5 (1 mol) of epichlorohydrin to give 50 mass of polymer B3. % Aqueous solution was obtained. The weight average molecular weight of the obtained polymer was 573,000.
• Synthesis example 4 In the same manner as in Synthesis Example 1, 236 g (1 mol) of N, N, N ′, N′-tetrahydroxyethylethylenediamine was reacted with 50.9 (0.55 mol) of epichlorohydrin to obtain 50% by mass of the polymer B4. An aqueous solution was obtained. The weight average molecular weight of the obtained polymer was 63,000.
• Synthesis example 5 A four-necked flask was charged with 116 g (1 mol) of diethylaminoethylamine and 196 g of water and mixed well. While maintaining the temperature at 40 to 50 ° C., 88 g (0.95 mol) of epichlorohydrin was added dropwise over about 2 hours. After completion of the dropwise addition, the reaction was continued for 1 hour at the same temperature and further for 8 hours at 70 to 80 ° C. to obtain a 50 mass% aqueous solution of polymer B5. The weight average molecular weight of the obtained polymer was 21,000.
• Synthesis Example 6 In the same manner as in Synthesis Example 5, 102 g (1 mol) of dimethylaminopropylamine and 92.5 g (1 mol) of epichlorohydrin were reacted to obtain a 50 mass% aqueous solution of polymer B6. The weight average molecular weight of the obtained polymer was 35,000.
• Synthesis example 7 In the same manner as in Synthesis Example 5, 102 g (1 mol) of dimethylaminopropylamine was reacted with 55.5 g (0.6 mol) of epichlorohydrin to obtain a 50% by mass aqueous solution of polymer B7. The weight average molecular weight of the obtained polymer was 5,300.
• Synthesis example 8 In the same manner as in Synthesis Example 5, 45.1 g (1 mol) of dimethylamine and 92.5 g (1 mol) of epichlorohydrin were reacted to obtain a 50 mass% aqueous solution of polymer B8. The weight average molecular weight of the obtained polymer was 620,000.
• Synthesis Example 9 In the same manner as in Synthesis Example 5, 45.1 g (1 mol) of dimethylamine and 46.3 g (0.5 mol) of epichlorohydrin were reacted to obtain a 50 mass% aqueous solution of polymer B9. The weight average molecular weight of the obtained polymer was 6,600.
• Synthesis Example 10 In the same manner as in Synthesis Example 5, 22.6 g (0.5 mol) of dimethylamine, 51 g (0.5 mol) of dimethylaminopropylamine and 92.5 g (1 mol) of epichlorohydrin were reacted to give a polymer B10. Was obtained. The weight average molecular weight of the obtained polymer was 960,000.
• Synthesis Example 11 In the same manner as in Synthesis Example 5, 22.6 g (0.5 mol) of dimethylamine, 51 g (0.5 mol) of dimethylaminopropylamine and 46.3 g (0.5 mol) of epichlorohydrin were reacted to obtain 50 mass of B11. % Aqueous solution was obtained. The weight average molecular weight of the obtained polymer was 9,000.
• Table 1 shows the composition of the raw gypsum used in the performance test.
• the gypsum dispersants of Examples 1 to 51 and Comparative Examples 1 to 3 were prepared at the composition ratios shown in Table 2, and the gypsum dispersibility and the gypsum set retardance were tested by the following test methods.
• a cylindrical hollow cylinder with an upper inner diameter of 75 mm, a lower inner diameter of 85 mm, and a height of 40 mm is prepared in advance in the center of a urethane board (35 cm x 35 cm), and the container (cylindrical hollow cylinder) is filled with gypsum slurry that has been kneaded. Poured immediately until Thereafter, the hollow cylinder was pulled up in a direction perpendicular to the urethane board, and the spread of the gypsum slurry was measured. The diameter that was considered to be the maximum spread and the diameter perpendicular to it were measured, and the average value was used as an index of dispersibility. The obtained results (average diameter) are shown in Table 2 (Table 2-1 and Table 2-2).

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