Abstract:
THE PRESENT INVENTION PROVIDES THE WATER-REDUCING AGENT FOR HYDRAULIC COMPOSITION, CONTAINING A NAPHTHALENESULFONIC ACID-FORMALDEHYDE CONDENSATE THAT HAS A WEIGHT AVERAGE MOLECULAR WEIGHT OF 1, 900 TO 24, 000 MEASURED BY GPC AND A PEAK AREA CORRESPONDING TO A MOLECULAR WEIGHT OF NOT MORE THAN 4, 000, MEASURED BY GPC, OF 17 TO 38% OF THE TOTAL PEAK AREA.
Abstract:
A hydraulic cement composition is effectively dispersed with use as a dispersion agent of a reaction product obtained by oxidizing and polymerizing a condensate between formaldehyde and a naphthalenesulfonic acid salt or an alkylnaphthalenesulfonic acid salt to have a constitutional unit derived by cutting of the methylene group, that derived by hydroxyzation and condensation polymerization and that derived by the oxidation and the ring-opening of the naphthalene ring.
Abstract:
THE INVENTION PROVIDES A PROCESS CAPABLE OF EASILY PRODUCING A WATER-SOLUBLE SALT OF A NAPHTHALENESULFONATE FORMALDEHYDE CONDENSATE WITH A REDUCED AMOUNT OF UNREACTED FORMALDEHYDE. WHEN NAPHTHALENESULFONIC ACID IS SUBJECTED TO CONDENSATION REACTION WITH FORMALDEHYDE TO PRODUCE A NAPHTHALENESULFONATE FORMALDEHYDE CONDENSATE, A SULFITE IS ADDED TO THE REACTION SYSTEM AFTER THE CONCLUSION OF THE CONDENSATION REACTION. WHEN A CEMENT DISPERSANT COMPOSITION IS OBTAINED, THE PROCESS INCLUDES A STEP OF NEUTRALIZING THE CONDENSATE.
Abstract:
PCT No. PCT/JP94/02097 Sec. 371 Date Jun. 13, 1996 Sec. 102(e) Date Jun. 13, 1996 PCT Filed Dec. 14, 1994 PCT Pub. No. WO95/16643 PCT Pub. Date Jun. 22, 1995An admixture for concrete comprising, as an essential component, a copolymer prepared by copolymerizing (a) a polyalkylene glycol monoester monomer having 110 to 300 mols of an oxyalkylene group(s) each having 2 to 3 carbon atoms, with (b) at least one monomer selected from among acrylic monomers, unsaturated dicarboxylic monomers and allylsulfonic monomers. When this admixture is used in preparing concrete, the resulting concrete composition undergoes little change in the slump for a lengthened time, so that the quality of the concrete composition can be easily controlled.
Abstract:
PCT No. PCT/JP94/02097 Sec. 371 Date Jun. 13, 1996 Sec. 102(e) Date Jun. 13, 1996 PCT Filed Dec. 14, 1994 PCT Pub. No. WO95/16643 PCT Pub. Date Jun. 22, 1995An admixture for concrete comprising, as an essential component, a copolymer prepared by copolymerizing (a) a polyalkylene glycol monoester monomer having 110 to 300 mols of an oxyalkylene group(s) each having 2 to 3 carbon atoms, with (b) at least one monomer selected from among acrylic monomers, unsaturated dicarboxylic monomers and allylsulfonic monomers. When this admixture is used in preparing concrete, the resulting concrete composition undergoes little change in the slump for a lengthened time, so that the quality of the concrete composition can be easily controlled.
Abstract:
PCT No. PCT/JP94/02097 Sec. 371 Date Jun. 13, 1996 Sec. 102(e) Date Jun. 13, 1996 PCT Filed Dec. 14, 1994 PCT Pub. No. WO95/16643 PCT Pub. Date Jun. 22, 1995An admixture for concrete comprising, as an essential component, a copolymer prepared by copolymerizing (a) a polyalkylene glycol monoester monomer having 110 to 300 mols of an oxyalkylene group(s) each having 2 to 3 carbon atoms, with (b) at least one monomer selected from among acrylic monomers, unsaturated dicarboxylic monomers and allylsulfonic monomers. When this admixture is used in preparing concrete, the resulting concrete composition undergoes little change in the slump for a lengthened time, so that the quality of the concrete composition can be easily controlled.
Abstract:
PROBLEM TO BE SOLVED: To provide a method for easily producing a naphthalenesulfonic acid formaldehyde condensate water-soluble salt which is decreased in the quantity of unreacted formaldehyde, produces a product stabilized in quality, and is reduced in the load to the environment, and thus is suitably applied to a cement dispersing agent. SOLUTION: When producing the naphthalenesulfonic acid formaldehyde condensate by condensating naphthalenesulfonic acid and formaldehyde, a sulfite is added to the reaction system after terminating the reaction. When obtaining a cement dispersing composition, a process of neutralizing the condensate is provided. COPYRIGHT: (C)2006,JPO&NCIPI
Abstract:
PROBLEM TO BE SOLVED: To provide a foaming agent for a hydraulic composition which is capable of improving the fluidity of a foam-commingled hydraulic composition and the strength of the cured product of the hydraulic composition without increasing the density of the cured product, and also excellent in foam stability. SOLUTION: This foaming agent for the hydraulic composition contains a specific sulfuric acid ester represented by general formula (I): [R 1 -O-(AO) m SO 3 ] p X and a specific polyether compound represented by general formula (II) : R 2 -O-(AO) y H. In general formula (I), R 1 is an 8-20C alkyl group, an alkenyl group or the like, AO is a mixture of at least one 2-4C oxyalkylene group, m is an average added molar number of AO, X is a hydrogen atom, an alkali metal, etc., and p is the valence of X. In general formula (II), R 2 is an 8-20C alkyl group, an alkenyl group or the like, AO is a mixture of at least one 2-4C oxyalkylene group, and y is an average added molar number of AO and a number of 1-9. COPYRIGHT: (C)2005,JPO&NCIPI
Abstract:
PURPOSE: To obtain an chemical admixture composition capable of reducing viscosity of concrete without damaging water reducing properties by blending a formaldehyde co-condensate with specific aromatic compounds with a defoaming agent. CONSTITUTION: This chemical admixture composition for a concrete product comprises a formaldehyde co-condensate with one or more aromatic compounds (A) into which 1-300mols of a 2-3C oxyalkylene group are introduced and one or more carboxyl group-containing aromatic compounds (B) or its neutral salt (X) and a defoaming agent (Y) as necessary components. By introducing the alkylene oxide group to the aromatic formaldehyde co-condensation system, expulsive force of steric hindrance of the alkylene oxide is added to electric expulsive force of essential aromatic system to extremely raise dispersing effect. The use of the defoaming agent with the co-condensate further improves reduction in viscosity and foam entraining properties.