Shrinkage-reducing agent for hydraulic material

Patent metadata

Field	Value
Publication number	US-10227258-B2
Application number	US-201515515481-A
Country	US
Kind code	B2
Filing date	Sep 30, 2015
Priority date	Sep 30, 2014
Publication date	Mar 12, 2019
Grant date	Mar 12, 2019

Abstract

The present invention aims to provide a shrinkage reducing agent that exhibits high performance to reduce the shrinkage of hydraulic materials. The present invention relates to a shrinkage reducing agent for a hydraulic material including a compound that satisfies the following conditions (1) to (4): (1) a ratio represented by {(15-drop flow value of a mortar composition containing the compound)/(15-drop flow value of a mortar free from the compound)}×100 is 120 or less, wherein the (15-drop flow value of a mortar composition containing the compound) means a 15-drop flow value of a mortar composition containing the compound at a solid concentration of 0.1% after 10 minutes mixing and the (15-drop flow value of a mortar free from the compound) means a 15-drop flow value of a mortar free from the compound after 10 minutes mixing; (2) a ratio represented by {(ratio between 15-drop flow values after two hours mixing)/(ratio between 15-drop flow values after 10 minutes mixing)}×100 is 110 or less, wherein the (ratio between 15-drop flow values after two hours mixing) means a ratio of a 15-drop flow value of a mortar composition containing the compound at a solid concentration of 0.1% after two hours mixing to a 15-drop flow value of a mortar free from the compound after two hours mixing, and the (ratio between 15-drop flow values after 10 minutes mixing) means a ratio of a 15-drop flow value of a mortar composition containing the compound at a solid concentration of 0.1% after 10 minutes mixing to a 15-drop flow value of a mortar free from the compound after 10 minutes mixing; (3) the compound has an average particle diameter of 2.2 to 8.5 nm in an alkaline solution; and (4) a product of {(ratio between 15-drop flow values relating to a mortar composition containing the compound at a solid concentration of 1.0%)×(ratio between 15-drop flow values relating to a mortar composition containing the compound at a solid concentration of 0.1%)} is 10,100 or more, wherein the (ratio between 15-drop flow values relating to a mortar composition containing the compound at a solid concentration of 1.0%) means a ratio of a 15-drop flow value of a mortar composition containing the compound at a solid concentration of 1.0% after 10 minutes mixing to a 15-drop flow value of a mortar free from the compound after 10 minutes mixing, and the (ratio between 15-drop flow values relating to a mortar composition containing the compound at a solid concentration of 0.1%) means a ratio of a 15-drop flow value of a mortar composition containing the compound at a solid concentration of 0.1% after 10 minutes mixing to a 15-drop flow value of a mortar free from the compound after 10 minutes mixing, the mortar compositions and the mortars are in accordance with JASS 5 M402.

First claim

The invention claimed is:

1. A shrinkage reducing agent for a hydraulic material comprising a compound that satisfies the following conditions (1) to (4), a 5% by mass aqueous solution of the compound having a surface tension of 55 to 70 mN/m:
(1) a ratio represented by {(15-drop flow value of a mortar composition containing the compound)/(15-drop flow value of a mortar free from the compound)}×100 is 120 or less,
wherein the (15-drop flow value of a mortar composition containing the compound) means a 15-drop flow value of a mortar composition containing the compound at a solid concentration of 0.1% after 10 minutes mixing and
the (15-drop flow value of a mortar free from the compound) means a 15-drop flow value of a mortar free from the compound after 10 minutes mixing;
(2) a ratio represented by {(ratio between 15-drop flow values after two hours mixing)/(ratio between 15-drop flow values after 10 minutes mixing)}×100 is 110 or less,
wherein the (ratio between 15-drop flow values after two hours mixing) means a ratio of a 15-drop flow value of a mortar composition containing the compound at a solid concentration of 0.1% after two hours mixing to a 15-drop flow value of a mortar free from the compound after two hours mixing, and
the (ratio between 15-drop flow values after 10 minutes mixing) means a ratio of a 15-drop flow value of a mortar composition containing the compound at a solid concentration of 0.1% after 10 minutes mixing to a 15-drop flow value of a mortar free from the compound after 10 minutes mixing;
(3) the compound has an average particle size of 2.2 to 8.5 nm in an alkaline solution; and
(4) a product of {(ratio between 15-drop flow values relating to a mortar composition containing the compound at a solid concentration of 1.0%)×(ratio between 15-drop flow values relating to a mortar composition containing the compound at a solid concentration of 0.1%)} is 10,100 or more,
wherein the (ratio between 15-drop flow values relating to a mortar composition containing the compound at a solid concentration of 1.0%) means a ratio of a 15-drop flow value of a mortar composition containing the compound at a solid concentration of 1.0% after 10 minutes mixing to a 15-drop flow value of a mortar free from the compound after 10 minutes mixing, and
the (ratio between 15-drop flow values relating to a mortar composition containing the compound at a solid concentration of 0.1%) means a ratio of a 15-drop flow value of a mortar composition containing the compound at a solid concentration of 0.1% after 10 minutes mixing to a 15-drop flow value of a mortar free from the compound after 10 minutes mixing,
the mortar compositions and the mortars are in accordance with JASS 5 M402.

2. The shrinkage reducing agent for a hydraulic material according to claim 1 ,
wherein the compound has an acid content of 25 mol % or more.

3. The shrinkage reducing agent for a hydraulic material according to claim 1 ,
wherein the compound is a polymer having in a structure at least one polymer chain selected from the group consisting of polymer chains derived from an ethylenically unsaturated monomer, polyalkylene glycol chains, and polyamine chains.

4. The shrinkage reducing agent for a hydraulic material according to claim 1 ,
wherein the compound is at least one compound selected from the group consisting of the compounds (I) to (V):
(I): a polymer including a structural unit represented by the following formula (1):

wherein R 1 to R 3 are the same as or different from each other and each represent a hydrogen atom or a methyl group, R 4 Os are the same as or different from each other and each represent a C2-C18 oxyalkylene group, R 5 represents a hydrogen atom or a C1-C30 hydrocarbon group, p represents 0 to 5, q represents 0 or 1, and n represents an average number of moles of oxyalkylene groups added and is 1 to 300; and
a structural unit represented by the following formula (2):

wherein R 6 to R 8 are the same as or different from each other and each represent a hydrogen atom, a methyl group, or a —(CH 2 ) m COOZ′ group, in which m is an integer of 0 to 2 and Z′ represents a hydrogen atom, a metal atom, an ammonium group, an organic amine group, or a hydrocarbon group, and Z represents a hydrogen atom, a metal atom, an ammonium group, an organic amine group, or a hydrocarbon group;
(II): a polymer prepared by graft polymerization of an ethylenically unsaturated monomer to a polyether compound represented by the following formula (3):
W—(R 9 O) r —Y  (3)

wherein R 9 Os are the same as or different from each other and each represent a C2-C18 oxyalkylene group, r represents an average number of moles of oxyalkylene groups added and is 1 to 2,000, and W and Y are the same as or different from each other and each represent a hydrogen atom or a methyl group;
(III): a (poly)alkylene glycol block copolymer having a structure in which a polymer chain (A) derived from an ethylenically unsaturated monomer component is bonded to an end of a (poly)alkylene glycol chain (B) via a binding site (X);
(IV): a polyalkylene glycol compound including a linear or branched polyalkylene glycol chain, the chain having at least two ends each of which has an organic residue bonded thereto, the organic residue being capable of adsorbing at least one selected from the group consisting of metals, metal compounds, and metal ions,
the organic residue containing at least one functional group selected from the group consisting of a carbonyl group, a hydroxy group, an amino group, a thiol group, a phosphoric acid group, a phosphorous acid group, and a silane group; and
(V): a polyamine compound having an acid group-containing side chain.

5. The shrinkage reducing agent for a hydraulic material according to claim 4 ,
wherein the polymer of (II) is a graft polymer prepared by graft polymerization of the ethylenically unsaturated monomer to the polyether compound so that the amount of an unsaturated carboxylic acid monomer in the ethylenically unsaturated monomer is 0.1% to 50% by weight relative to the polyether compound.

6. The shrinkage reducing agent for a hydraulic material according to claim 4 ,
wherein the polyether compound represented by the formula (3) has a weight average molecular weight of 1,000 to 1,000,000.

7. A hydraulic material composition comprising:
the shrinkage reducing agent for a hydraulic material according to claim 1 ;
a hydraulic material; and
water.

8. A composition for a hydraulic material comprising:
the shrinkage reducing agent for a hydraulic material according to claim 1 ; and
an antifoaming agent,
wherein a mixing ratio between the shrinkage reducing agent for a hydraulic material and the antifoaming agent in the composition for a hydraulic material, (mass of the shrinkage reducing agent for a hydraulic material)/(mass of the antifoaming agent), is 99.99/0.01 to 85/15, and
when 0.7% by mass of the shrinkage reducing agent for a hydraulic material is added to a cement to provide a mortar composition, the mortar composition has a bubble spacing factor of 350 μm or less measured by an air void analyzer.

9. The composition for a hydraulic material according to claim 7 , further comprising an air-entraining agent,
wherein a mixing ratio between the shrinkage reducing agent for a hydraulic material and the air-entraining agent in the composition for a hydraulic material, (mass of the shrinkage reducing agent for a hydraulic material)/(mass of the air-entraining agent), is 99.98/0.02 t

Assignees

• Nippon Catalytic Chem Ind

Inventors

• Masanaga Mari

Classifications

• C04B2103/50

  Defoamers, air detrainers · CPC title

• C04B24/04

  Carboxylic acids; Salts, anhydrides or esters thereof · CPC title

• C04B24/2611

  Polyalkenes · CPC title

• C04B2103/302

  Water reducers · CPC title

• C04B2103/304

  Air-entrainers · CPC title