JP5465982B2 - Admixture for hydraulic composition and its application - Google Patents

Description

  The present invention relates to an admixture for a hydraulic composition mainly used as a building material and its application.

For hydraulic compositions used for building materials, especially plastering materials applied with trowels, it is good at the time of application by adding seaweed glue such as “Tsumata”, a natural product, as an admixture. The workability etc. was ensured. Thereafter, water-soluble cellulose ethers typified by methyl cellulose (water-soluble alkyl cellulose, water-soluble hydroxyalkyl alkyl cellulose, water-soluble hydroxyalkyl cellulose, etc.) were developed as semi-synthetic polymers, and are now generally used.
The following effects (1) to (5) may be mentioned as the effects exhibited in the hydraulic composition containing the water-soluble cellulose ether (hereinafter sometimes simply referred to as cellulose ether).

(1) Neutral to alkaline, can provide a stable and appropriate thickening, and can improve workability at the time of glazing.
(2) Water retention can be improved by a thickening effect and a hydration effect. Improved water retention prevents water from separating from the hydraulic material, for example, and prevents water from evaporating from the hydraulic composition by drying, allowing longer work life when tiling. It becomes.
(3) The pressure-bonding property can be improved by a combination of a thickening effect, improvement in water retention, adhesion of cellulose ether molecules themselves, and the like. For example, it improves the adhesion between the cement mortar and the tile and the base, contributes to prevention of tile slipping, and contributes to improvement of the adhesive strength after curing.
(4) Along with improved workability at the time of glazing, the surface finish can be improved.
(5) There is a certain setting delay effect.
An admixture other than cellulose ether has not yet been found that satisfies both the effects (1) to (5) above (particularly improved workability and improved water retention). In spite of the fact that cellulose ether is particularly expensive, there is no substitute in terms of action and effect, so that it must be used.

In recent years, due to remarkable economic growth in China, India, etc., various raw materials have risen in price, and the cost of raw materials and processes has become increasingly urgent even at each building material manufacturer.
Conventionally, as a general method for reducing the cost of a cellulose ether admixture, a higher-viscosity cellulose ether is used to reduce its blending amount, thereby reducing the total cost of the hydraulic composition.

However, in this method, the relationship between the amount of admixture and water retention, and the relationship between the amount of admixture and the thickening effect (workability) are not always the same. If it is satisfied, the water retention cannot be satisfied, and if the blending amount is adjusted to satisfy the water retention, the viscosity is excessively increased and the workability is lowered. For this reason, when actually reducing costs, water retention or workability is compromised at the worst.
Many efforts have been made to improve the water retention and workability by adding an auxiliary agent to cellulose ether. For example, Patent Document 1 includes polyacrylamide and / or partially anionized polyacrylamide, Patent Document 2 includes sepiolite, Patent Document 3 includes hydroxyalkyl starch, Patent Document 4 includes welan gum and / or ramsan gum, Patent Document 5 For hydroxypropylated starch and / or gum or modified product thereof, Patent Document 6 for carrageenan, and Patent Document 7 for (poly) glycerin partial fatty acid ester in combination with cellulose ether for water retention, workability, etc. Efforts to improve are disclosed. Most of Patent Documents 1 to 7 are not directly implemented for the purpose of reducing the blending amount to reduce the cost. However, it is considered that by increasing the water retention, workability, etc., the amount can be reduced by that amount.

The auxiliary agents described in Patent Documents 1 to 6 have a thickening effect independently from the cellulose ether, and the water retention depends only on the cellulose ether. In these methods, when the blending amount of the admixture is adjusted in order to satisfy the water retention, the thickening effect of the auxiliary agent is also manifested and excessively thickened. As a general plastering material, workability deteriorates. Further, the auxiliary agent described in Patent Document 7 has an effect of improving fluidity and reducing viscosity, and it is possible to adjust the viscosity to some extent. However, since water retention depends on only cellulose ether, it is necessary to use cellulose ether with higher viscosity to improve water retention, and as a result, viscosity may increase. The more viscous cellulose ether is used, the more difficult it is to adjust the viscosity. Therefore, in order to create an admixture for reducing the cost of a versatile hydraulic composition, it is necessary to incorporate a component that expresses or reinforces water retention other than cellulose ether, unlike Patent Documents 1-7. it is conceivable that.
In addition, it has been considered that sugar and / or a derivative thereof used in combination with cellulose ether for reinforcing water retention does not develop water retention even when used alone.

JP 60-16849 A JP 60-122758 A JP 61-72663 A JP-A-4-367549 Japanese Patent Laid-Open No. 10-36162 JP-A-11-349364 JP 2003-104764 A

  An object of the present invention is to provide an admixture for a hydraulic composition that can reduce the blending amount of the admixture with respect to a hydraulic substance while maintaining equivalent or higher water retention, workability, surface finish, and pressure-bonding property. The object is to provide a hydraulic material, a hydraulic composition and a molded product.

As a result of intensive studies to solve the above problems, the present inventors have combined a cellulose ether having a higher viscosity than usual with a low molecular type sugar and / or derivative, and further a thickener and / or a fluidity improver. Thus, the present invention has been achieved by surprisingly confirming that the water retention, workability and other performances are equivalent or better despite the fact that the blending amount of the admixture has been lowered than before.
That is, the admixture for hydraulic composition according to the present invention comprises a component A comprising a water-soluble cellulose ether having a viscosity of 8,000 to 50,000 mPa · s at 20 ° C. in a 1% by weight aqueous solution, and a molecular weight of 450 to 5. An admixture for a hydraulic composition comprising a B component composed of 1,000 sugars and / or derivatives thereof, and a C component composed of a thickener and / or a fluidity improver.

The weight ratio of the A component and the B component (A component / B component) is preferably in the range of 30/70 to 95/5.
The weight ratio of the C component is preferably in the range of 0.01 to 2% with respect to the total amount of the A component and the B component.

The component A is preferably at least one selected from water-soluble alkyl cellulose, water-soluble hydroxyalkyl alkyl cellulose and water-soluble hydroxyalkyl cellulose.
The thickener is preferably at least one selected from an acrylamide polymer, a copolymer (salt) of dimethylamine and epichlorohydrin, and a polymer of dimethyldiallylammonium salt.
The fluidity improver is preferably at least one selected from polycarboxylic acids and anionic surfactants.

The anionic surfactants are alkylbenzene sulfonic acid (salt), alkyl sulfonic acid (salt), alkenyl sulfonic acid (salt), alkylbenzene sulfate (salt), alkyl sulfate (salt) and alkenyl sulfate (salt). It is preferable that it is at least one selected from.
The hydraulic material concerning this invention is a hydraulic material containing the said admixture for hydraulic compositions and a hydraulic substance.

It is preferable that the hydraulic substance is cement and / or gypsum.
The weight ratio of the admixture for hydraulic composition in the hydraulic material is preferably 0.003 to 2% by weight.

The hydraulic composition concerning this invention is a hydraulic composition formed by mixing the said hydraulic material and water.
The molded product according to the present invention is a molded product obtained by curing the hydraulic composition.

In the admixture for hydraulic composition of the present invention (hereinafter, sometimes referred to simply as “admixture”), the blending amount with respect to the hydraulic substance can be lowered, and the water retention, workability, and surface finish equivalent to or higher than conventional ones can be reduced. In addition, a hydraulic material that retains the press bonding property is obtained.
Since the hydraulic material of the present invention contains the above-mentioned admixture, the blending amount of the admixture with the hydraulic substance can be reduced, and the water retention, workability, surface finish, and pressure-bonding property equal to or higher than those of the conventional material can be maintained. it can.

Since the hydraulic composition of the present invention contains the hydraulic material, the blending amount of the admixture with respect to the hydraulic substance can be reduced while maintaining water retention and workability equivalent to or higher than conventional ones. It is possible to produce a molded product having a surface finish equal to or better than that of the above and a press-bonding property.
Since the molded product of the present invention is obtained by curing the hydraulic composition, the blending amount of the admixture can be reduced while maintaining a surface finish and pressure-bonding property equal to or higher than those of the conventional one.

(Admixture for hydraulic composition)
The admixture for hydraulic composition of the present invention comprises a component A comprising a water-soluble cellulose ether having a viscosity of 8,000 to 50,000 mPa · s at 20 ° C. in a 1% by weight aqueous solution, and a molecular weight of 450 to 5,000. An admixture comprising a B component composed of sugar and / or a derivative thereof and a C component composed of a thickener and / or a fluidity improver.

In the present invention, the component A alone contributes to water retention and workability, but it provides sufficient water retention by combining with sugar and / or a derivative thereof, and thickening that enables workability adjustment with a small amount is added. In combination with an agent and / or a fluidity improver, it is a component that adjusts viscosity and imparts moderate workability. The component A is not particularly limited as long as it is a water-soluble cellulose ether satisfying a specific physical property of 8,000 to 50,000 mPa · s at 20 ° C. in a 1% by weight aqueous solution. Water-soluble hydroxyalkyl alkyl cellulose and water-soluble hydroxyalkyl cellulose are preferred.
The water-soluble alkyl cellulose is not particularly limited, and examples thereof include methyl cellulose. The water-soluble hydroxyalkylalkylcellulose is not particularly limited, and examples thereof include hydroxypropylmethylcellulose and hydroxyethylmethylcellulose. The water-soluble hydroxyalkyl cellulose is not particularly limited, and examples thereof include hydroxyethyl cellulose and hydroxypropyl cellulose. Among the water-soluble cellulose ethers, water-soluble hydroxyalkylalkylcelluloses such as hydroxypropylmethylcellulose and hydroxyethylmethylcellulose are more preferable.

The water-soluble cellulose ether should just contain at least 1 type in the admixture for hydraulic compositions as A component, and 2 or more types of water-soluble cellulose ether may contain it.
Examples of commercially available water-soluble cellulose ethers include hydroxypropyl methylcellulose such as Metroles SHV-PF (manufactured by Shin-Etsu Chemical Co., Ltd.); Marporose ME-250T, Marporose ME-350T (above, Matsumoto Yushi Seiyaku Co., Ltd.) Examples thereof include hydroxyethyl methylcellulose such as Metrows SHV-WF (manufactured by Shin-Etsu Chemical Co., Ltd.).

The viscosity (20 ° C.) of the water-soluble cellulose ether is 8,000 to 50,000 mPa · s, preferably 8,300 to 40,000 mPa · s, when an aqueous solution containing 1% by weight of the water-soluble cellulose ether is used. s, more preferably 9,000 to 36,000 mPa · s, still more preferably 9,500 to 30,000 mPa · s, and particularly preferably 10,000 to 22,000 mPa · s. When the viscosity is lower than 8,000 mPa · s, it is necessary to increase the blending amount in order to obtain sufficient water retention and appropriate thickening, which may be disadvantageous in cost. On the other hand, when the viscosity is higher than 50,000 mPa · s, there is a large increase in viscosity, and even in combination with the B component and the C component, it may be difficult to achieve both water retention and workability. Furthermore, with the current technology, it is very difficult to industrially produce high viscosity cellulose ether, the cost is very high, and it is not economically advantageous.
When water-soluble cellulose ether is composed of many kinds, even if the viscosity of one type of water-soluble cellulose ether is outside the range of 8,000 to 50,000 mPa · s, it should be mixed with another water-soluble cellulose ether. Thus, the viscosity may be 8,000 to 50,000 mPa · s as a whole.

The viscosity in the present invention is measured according to JIS Z 8803, and details thereof are described in Examples.
Next, the component B is a component composed of a sugar having a molecular weight of 450 to 5,000 and / or a derivative thereof. In the present invention, the component B is a component that mainly contributes to the effect of improving the water retention function of the component A.

The B component is about 1.0 to 1.1 mPa · s, which is very close to water in terms of the viscosity at 20 ° C. of a 1% by weight aqueous solution, and it is considered that no thickening occurs in the hydraulic composition. ing. Although the mechanism of action in the present invention has not been elucidated in detail, the water retention of water-soluble cellulose ether and sugar is not simply summed up, and water-soluble cellulose ether and sugar without water retention have some interaction. It is speculated that the water retention is surprisingly increased.
Examples of the sugar include malto-oligosaccharides such as maltotriose, maltotetraose, maltopentaose, maltohexaose, maltoheptaose, and maltooctanose; xylooligosaccharides such as xyloheptaose; Examples include cellooligosaccharides such as aose; cyclodextrins such as α-cyclodextrin, β-cyclodextrin and γ-cyclodextrin.

In the present invention, the sugar derivative as the component B means a substance having the same sugar and molecular skeleton, but having a hydroxyl group and / or carbonyl group in the molecule substituted with another substituent.
Examples of sugar derivatives include agarooligosaccharides such as agarotetraose and agarohexaose; N-acetylchitooligosaccharides (for example, N-acetylchitotriose, N-acetylchitotetraose, N-acetylchitopenta). Oose, N-acetylchitohexaose, N-acetylchitoheptaose, etc.), chitooligosaccharide (salt) (for example, chitotriose, chitotetraose, chitopentaose, chitohexaose, chitoheptaose, and salts thereof) Amino sugar (salt): 3-10 mer with glucuronic acid (salt) as a structural unit, 3-10 mer with mannonuronic acid (salt) as a structural unit, glucuronic acid (salt) and mannonuronic acid (salt) Alginate oligosaccharides (salts) such as 3- to 10-mer as structural units; methylation-maltotriose, hydroxy Sugar ethers (sugar alkylates, hydroxyalkyl alkylates, carboxyalkylates, hydroxyalkylates) such as pyrmethylated β-maltotriose and carboxymethylated β-maltotriose (salt); acetylated maltotri Examples thereof include sugar esters (sugar acetylates, sulfates, phosphates) such as ose and sulfated β-maltotriose (salt).

Among the sugars and / or derivatives (component B), sugars and / or derivatives having only a glucose skeleton as a structural unit are preferable. Preferred examples of the component B include, for example, maltooligosaccharide, cellooligosaccharide, cyclodextrin, N-acetylchitooligosaccharide, chitooligosaccharide (salt), methylated-maltotriose, hydroxypropylmethylated-maltotriose, carboxymethylated- Examples thereof include maltotriose (salt), acetylated-maltotriose, sulfated-β-cyclodextrin (salt), and the like.
Among the sugars and / or derivatives (component B), a sugar having only a glucose skeleton as a structural unit is more preferable.

The salt in the component B is a sugar and / or derivative ionized by elimination of protons from acidic groups such as carboxylic acid groups and sulfate groups in the molecule and / or addition of protons to basic groups such as amino groups. It means a salt of a sugar and / or a derivative ion-bonded to a paired cation or anion.
The pair of cations is not particularly limited, and examples include calcium (Ca ²⁺ ), potassium (K ⁺ ), sodium (Na ⁺ ), and the like. Further, the anion to be paired is not particularly limited. For example, chloride (Cl ⁻ ), sulfuric acid (SO ₄ ²⁻ ), hydrogen sulfate (HSO ₄ ⁻ ), acetic acid (CH ₃ COO ⁻ ), lactic acid ( CH ₃ CH (OH) COO ⁻ ) and the like. The paired cation and anion may further have an ionic bond with one or more cations and anions.

The B component sugar and / or its derivative may contain at least one kind in the admixture for hydraulic composition. Of course, two or more kinds of sugars and / or derivatives thereof may be contained as the B component.
The molecular weight of the component B is 450 to 5,000, preferably 500 to 4,500, more preferably 600 to 3,500, still more preferably 700 to 2,500, and particularly preferably 750 to 2,000. When the molecular weight of component B is less than 450, the setting delay action becomes very large, and the setting delay time is abnormally increased even if the blending amount of water-soluble cellulose ether and sugar and / or derivative thereof is adjusted. May be adversely affected. On the other hand, when the molecular weight is larger than 5,000, even when combined with a water-soluble cellulose ether, it hardly leads to improvement in water retention, and it may be necessary to add a large amount, which may be disadvantageous in cost.

When the B component is a mixture of a plurality of sugars and / or derivatives thereof, the molecular weight of the B component means a number average molecular weight, and it may satisfy 450 to 5,000.
The component B is preferably water-soluble, but can be used without any problem if dissolved in 1 g or more in 100 ml of ion-exchanged water at 20 ° C.

  Some B components have a setting delay action and / or a fluidization action (water reduction action). The setting delaying action is an action that binds to a hydraulic substance, particularly calcium ion, causes hardening inhibition and prolongs the setting time (start time and end time). The setting delay action can ensure a sufficient pot life during construction and may improve work efficiency. However, a strong setting delay action is not preferable because it may lead to a decrease in the initial hardening strength. When 0.05 parts by weight of the component B is added alone with respect to 100 parts by weight of cement, it can be suppressed to an extension of 250 minutes or less from the setting time of ordinary Portland cement. Derivatives are preferred. Water-soluble cellulose ether also has a setting retarding action, and in the present invention, by combining the blending amount / type of water-soluble cellulose ether (A component) with reduced blending amount and sugar and / or its derivative (B component). Compared with the conventional addition of water-soluble cellulose ether, the setting time can be shortened, equalized, or delayed. If the setting time is longer than 250 minutes, the setting delay time may be abnormally increased even if the blending amount of the water-soluble cellulose ether and sugar and / or its derivative is adjusted, and the initial hardening strength may be adversely affected.

The fluidizing action is an action that can increase the fluidity of the hydraulic composition when added. Since it is possible to handle with a smaller amount of water by increasing the fluidity, for example, in the cement industry, such an action is called a water reducing action.
The fluidizing action or water reducing action is merely an additional action, and may vary depending on the preparation conditions of the hydraulic composition (type of hydraulic substance, temperature at the time of preparation, etc.) and may be difficult to control. Also, its action is the same as, or in many cases smaller than, conventional water reducing agents, AE water reducing agents, and high performance AE water reducing agents. For this reason, in addition to the A component and the B component, it is necessary to add a C component having a large effect of adjusting the viscosity and fluidity, thereby adjusting the viscosity and fluidity and imparting appropriate workability.

The weight ratio of the component A to the component B (component A / component B) is preferably 30/70 to 95/5, more preferably 40/60 to 94/6, and still more preferably 50/50. To 93/7, particularly preferably 55/45 to 92/8, most preferably 60/40 to 90/10. When component A / component B is greater than 95/5, more water-soluble cellulose ether having a lower viscosity must be added to satisfy water retention and workability. In some cases, there is no advantage over the conventional formulation. On the other hand, when the A component / B component is smaller than 30/70, the A component is too small, so that the water retention expressed by combining the A component and the B component is weakened, and further, the setting delay can be adjusted. It can be difficult.
Component C is a component composed of a thickener and / or a fluidizing agent. In the present invention, the component C is a component that mainly adjusts the viscosity and fluidity of the hydraulic composition and imparts appropriate workability.

The said thickener is a component which expresses the effect of thickening a hydraulic composition only by mix | blending a small amount mainly. The workability of the hydraulic composition that has been fluidized by sugar and / or its derivatives and has poor workability can be improved by the above effect. For example, a cement mortar for tiles can improve breakage of the tiles and prevent the attached tiles from shifting. As the thickener, an acrylamide polymer, a copolymer (salt) of dimethylamine and epichlorohydrin, a polymer of dimethyldiallylammonium salt, and the like are preferable, and other components included in the hydraulic material, particularly a hydraulic substance. Adhesion cross-linking to the surface, neutralization of charge in the hydraulic composition, etc., effectively causes aggregation of other components contained in the hydraulic material, especially hydraulic substances, and thickens the hydraulic composition .
The acrylic amide polymer may be nonionic, anionic, or cationic. As the acrylamide polymer, for example, polyacrylamide, a copolymer of acrylamide and acrylic acid (salt), a polyacrylamide partial hydrolyzate, a sulfonated polyacrylamide (salt) into which a sulfone group has been introduced, Examples thereof include a copolymer of acrylic amide and dimethyl diallyl ammonium salt.

The fluidity improver is a component that exhibits an effect of fluidizing the hydraulic composition only by blending a small amount. The workability of a hydraulic composition that is not fluidized by sugar and / or its derivative and is excessively thickened by high-viscosity cellulose ether and has poor workability can be improved by the above effect. As a fluidity improver, polycarboxylic acid and anionic surfactants are adsorbed to other components contained in the hydraulic material, particularly hydraulic substances, and are hydraulic by action such as electrostatic repulsion and steric hindrance. This is preferable because it effectively causes dispersion of other components contained in the material, particularly a hydraulic substance, and fluidizes the hydraulic composition.
Examples of polycarboxylic acids include maleic acid-based compounds such as maleic anhydride, maleic acid (salt), and maleic acid esters; (meth) such as acrylic acid (salt), methacrylic acid (salt), acrylic acid ester, and methacrylic acid ester Acrylic acid compounds: Polymers of monomers such as unsaturated (poly) alkylene glycol ether monomers (salts) having a carboxyl group. The polycarboxylic acid may be a homopolymer of one kind of monomer or a copolymer of two or more kinds of monomers. In addition, one or more of these monomers and one or more of other vinyl monomers such as unsaturated (poly) alkylene glycol ether monomers having no styrene or carboxyl group A copolymer may be used.

In the present invention, anionic surfactants mean an anionic surfactant comprising an organic acid salt and / or an undissociated organic acid thereof. As anionic surfactants, alkylbenzenesulfonic acid (salt), alkylsulfonic acid (salt), alkenylsulfonic acid (salt), alkylbenzenesulfuric acid ester (salt), alkylsulfuric acid ester (salt), alkenylsulfuric acid ester (salt), etc. However, it is less susceptible to the influence of ions in the hydraulic composition, and is preferable because other components contained in the hydraulic material, particularly the hydraulic substance, can be stably dispersed.
The anionic surfactants preferably have an alkyl or alkenyl group in the molecule having 6 or more carbon atoms, more preferably those having 8 or more carbon atoms in the molecule.

The salt in component C is a thickening ionized by elimination of protons from acidic groups such as carboxylic acid groups, sulfonic acid groups, and sulfuric acid groups in the molecule and / or addition of protons to basic groups such as amino groups. It means a salt of a thickener and / or a fluidity improver which is ionically bonded to a cation, an anion and an anion and / or fluidity improver.
The pair of cations is not particularly limited, and examples thereof include potassium (K ⁺ ), sodium (Na ⁺ ), ammonium (NH ₄ ⁺ ), and the like. The anion to be paired is not particularly limited, and examples thereof include chloride (Cl ⁻ ) and hydroxide (OH ⁻ ). The paired cation and anion may further have an ionic bond with one or more cations and anions.

Some of the C components have a setting delay action as in the case of the A and B components. In particular, polycarboxylic acid is considered to have the action. However, in the present invention, the amount of component C used is less than that of component A or component B, and this hardly leads to an increase in the setting delay time.
The said C component should just contain at least 1 type in the admixture for hydraulic compositions, and workability | operativity may be adjusted by making it contain 2 or more types.
The weight ratio of component C is preferably in the range of 0.01 to 2% with respect to the total amount of component A and component B, more preferably 0.05 to 1.8%, still more preferably 0.1. -1.6%, particularly preferably 0.3-1.4%, most preferably 0.5-1.3%. When the weight ratio of component C is less than 0.01%, viscosity and fluidity cannot be adjusted, and a hydraulic composition with appropriate workability may not be obtained. On the other hand, if it is larger than 2%, sufficient water retention cannot be obtained, and it is necessary to add a large amount, which may be disadvantageous in cost.

The component C is preferably in a solid form, but even when it is in a liquid form, it is also possible to prepare an admixture for a hydraulic composition by mixing the component A and the component B with a liquid spray or the like. As long as the effect of the present invention is not impaired, another substance such as silica may be impregnated with a liquid C component, and then mixed with the A component and the B component to prepare an admixture for a hydraulic composition.
The component C is preferably water-soluble, but it can be used without any problem if dissolved in 0.01 g or more in 100 ml of ion-exchanged water at 20 ° C.

[Hydraulic material]
The hydraulic material of the present invention includes the above admixture for hydraulic composition and a hydraulic substance. The hydraulic material of the present invention includes those obtained by separately mixing each component constituting the admixture for hydraulic composition with a hydraulic substance.
As the hydraulic substance, cement and / or gypsum are preferable.

The cement is not particularly limited. For example, ordinary Portland cement, early-strength Portland cement, moderately hot Portland cement, sulfate-resistant Portland cement, low alkali type Portland cement, blast furnace cement, silica cement, fly ash cement, Examples include white Portland cement, ultra-high speed cement, ultra fine particle cement, alumina cement, and jet cement.
The gypsum is not particularly limited, and examples thereof include type I anhydrous gypsum, type II anhydrous gypsum, type III anhydrous gypsum, dihydrate gypsum, α type hemihydrate gypsum, β type hemihydrate gypsum, and the like.

The amount of the hydraulic substance to be blended is not particularly limited as long as the necessary strength is obtained.
The weight ratio of the admixture for hydraulic composition in the hydraulic material is not particularly limited, but is preferably 0.003 to 2% by weight, more preferably 0.005 to less than 1% by weight, Preferably it is 0.01-0.8 weight%, Especially preferably, it is 0.02-0.4 weight%, Most preferably, it is 0.04-0.15 weight%. When the weight ratio of the admixture for hydraulic composition is larger than 2% by weight, the blending amount is large, which may be disadvantageous in cost. On the other hand, when the weight ratio of the admixture for hydraulic composition is less than 0.003% by weight, performance such as water retention and workability may not be satisfied.

In addition to the above components, the hydraulic material of the present invention is, as necessary, within a range that does not impair the effects of the present invention. For example, the binder, fine aggregate, inorganic filler, organic filler, reinforcing fiber, lightweight Aggregates, expansion materials, adhesion-imparting agents, fillers, rust preventives, waterproofing agents, fungicides, antifoaming agents, setting retarders, setting accelerators, AE agents, AE water reducing agents, high performance AE water reducing agents, etc. Other ingredients such as various admixtures and admixtures can be included.
Furthermore, synthetic water-soluble polymers such as polyvinyl alcohol and polyalkylene glycol conventionally used in combination with water-soluble cellulose ethers, semi-synthetic water-soluble polymers such as hydroxypropylated starch, and natural water-soluble polymers such as guar gum and welan gum. May be used in combination as long as the object of the present invention is not impaired.

You may mix the said other component at the time of the admixture for hydraulic compositions as needed.
[Hydraulic composition and molded product]
The hydraulic composition of the present invention is a mixture of the hydraulic material and water.

The amount of water contained in the hydraulic composition is selected according to the type of hydraulic material and the like, and can be a normal dose, but is preferably in the range of 10 to 100% by weight with respect to the hydraulic substance.
The hydraulic composition of the present invention includes those obtained by separately mixing each component constituting the hydraulic material with water.

The molded product of the present invention is obtained by curing the hydraulic composition, for example, concrete base cement mortar, lath base cement mortar, tile cement mortar, sand mortar, fireproof coating cement mortar, plastering Hardened materials such as cement mortar, thick coating cement mortar, repair cement mortar, gypsum plaster, gypsum bond, gypsum putty, etc., are mainly used as building materials.
The molded product is obtained by curing the hydraulic composition by a conventional method.

The present invention is described in detail in the following examples and comparative examples, but the present invention is not limited thereto.
[Viscosity measurement of A component and B component]
The viscosity in the present invention is a value obtained by using a B-type rotational viscometer as a single cylindrical viscometer at 20 mPa · s or more, and a Canon-Fenske viscometer is used as a capillary viscometer at less than 20 mPa · s. The obtained value. Each viscosity measurement was performed at 20 ° C. according to JIS Z 8803.
When measuring the viscosity using a B-type rotational viscometer, the type and number of rotations of the rotating rotor were determined and measured so that the measured value obtained in% display was within the measurement range of 30 to 80%. The viscosity was obtained by multiplying the measured value by a conversion multiplier under each measurement condition (rotating rotor type / rotational speed). When there are a plurality of measurement condition candidates, they are preferentially adopted in the order of the number of revolutions 12 rpm> 30 rpm> 6 rpm> 60 rpm. 4> No. 3> No. 2> No. Adopted and decided preferentially in order of 1.

According to the viscosity measuring method, first, A1 (hydroxypropylmethylcellulose) corresponding to the component A of the present invention was dissolved in ion-exchanged water at a concentration of 1% by weight, and then the viscosity at 20 ° C. was measured. The viscosity (measured value) under each measurement condition (rotary rotor type / rotation speed) is No. Out of range at 4/6 rpm (less than 30%), No. 15500 mPa · s (31%) at 4/12 rpm, no. 9,600 mPa · s (48%) at 4/30 rpm, no. 6/400 mPa · s (64%) at 4/60 rpm, no. Out of range (greater than 80%) at 3/6 rpm. Therefore, the measurement conditions are No. 4/12 rpm was adopted, and the viscosity of A1 was set to 15,500 mPa · s.
In the same manner as the method for determining the viscosity of A1, the viscosities of the A component and the B component used in Examples and Comparative Examples were determined as shown in Table 1 or Table 2.
For A4 and A5, two types of water-soluble cellulose ethers were mixed to adjust the viscosity and the like and used in the following examples. As shown in Table 1, the type / ratio of the mixture and the viscosity under the conditions were determined. .

[Evaluation of setting delay time of component B]
B1 corresponding to component B of the present invention (β-cyclodextrin, molecular weight: 1,150; manufactured by Nippon Food Chemical Co., Ltd., trade name: Celdex B-100) with respect to 100 parts by weight of cement (ordinary Portland cement) Was evaluated for the setting delay time when 0.05 part by weight was added. The setting delay time was evaluated according to JIS R 5201. Both kneading and evaluation were performed under conditions of a temperature of 18 to 22 ° C. and a humidity of 55% to 75%. In the evaluation, first, the setting time, that is, the initial time S and the final time T were evaluated. The initial start time indicates a convenient time in JIS from when water is added to the hydraulic material until the setting of the hydraulic composition starts. The term “end time” refers to a convenient time in JIS from when water is added to the hydraulic material until the setting of the hydraulic composition is completed. Further, the start time S ₀ and the end time T ₀ when B1 is not added in the same manner as described above are also evaluated, and the condensation delay time (min) of each of the start time and the end time is calculated by the following formula (1), Calculated according to (2).
Setting delay time of first departure time = S−S ₀ (1)
Setting delay time of closing time = T−T ₀ (2)
In the same manner as the setting delay time of B1, the setting delay time of the B component used in the examples was determined as shown in Table 2.

[Example 1-1]
84.3 parts by weight of A4 (mixture of A1 (hydroxypropylmethylcellulose) / A2 (hydroxypropylmethylcellulose) = 7.0 / 3.0) as a component corresponding to component A and B1 as a component corresponding to component B 15.0 parts by weight and 0.7 parts by weight of C1 (sodium lauryl sulfate, Kao Corporation, trade name: Emar O) as a component corresponding to the C component are sufficiently mixed to prepare an admixture for hydraulic composition. Prepared. Hereinafter, this admixture for hydraulic composition is referred to as an admixture α-1.

[Examples 1-2 to 1-5 and Comparative Examples 1-1 to 1-8]
In Example 1-1, as shown in Table 3 or 4, except that the types and amounts of the A component, the B component, and the C component were each changed, the admixture α-2 to α-5 was prepared respectively.
As an example of a conventional admixture (comparative admixture) for admixtures α-1 to α-3, a1 (hydroxypropylmethylcellulose) was used as admixture β-1. As an example of a conventional admixture (comparative admixture) for admixtures α-4 and 5, a2 (hydroxypropylmethylcellulose) was used as admixture β-2.

  In Example 1-1, the admixtures γ-1 to γ-1 were changed in the same manner as in Example 1-1 except that the types and amounts of the A component, the B component, and the C component were changed as shown in Table 3 or 4. Each γ-6 was prepared. Admixtures γ-1 to γ-6 are comparative admixtures different from admixture β-1 and admixture β-2.

[Concrete foundation cement mortar test]
To 65 parts by weight of cement (ordinary Portland cement) and 32.5 parts by weight of silica sand No. 8 (fine aggregate), add the types and amounts of the admixtures shown in Table 5 and mix well to obtain the hydraulic material. Prepared. EVA emulsion (ethylene-vinyl acetate copolymer emulsion, adhesion-imparting agent, solid content concentration: 45% by weight) 2.2 parts by weight (in terms of solid content) is dispersed in water before mixing with the hydraulic material. It was.
Next, water in which EVA emulsion was dispersed was added to the hydraulic material, and kneaded for 3 minutes with a mortar mixer to prepare a concrete base cement mortar (hydraulic composition). In addition, kneading | mixing was performed according to the JISR5201 10.4.3 kneading | mixing method. The amount of water added during kneading was adjusted so that the flow value was within the range of 180 to 185 mm according to the flow value evaluation described below. Table 5 shows the flow value. The kneading and the following evaluation and curing were carried out under conditions of a temperature of 18 to 22 ° C. and a humidity of 55% to 75%. Using the prepared cement mortar, the water retention rate evaluation and the glazing workability evaluation described later were performed. Furthermore, after curing the cement mortar for one week, the mortar adhesive strength evaluation and surface condition evaluation described later were carried out using the molded product.

[Tile cement mortar test]
Add 50 parts by weight of cement, 10 parts by weight of silica sand No. 5 (fine aggregate), and 40 parts by weight of silica sand No. 6 (fine aggregate) and add the types and amounts of admixtures shown in Table 6 or 7 respectively. Mixed to prepare a hydraulic material.
During the kneading, the amount of water added was adjusted so that the flow value was within the range of 164 to 169 mm according to the flow value evaluation described later, and the flow values are shown in Table 6 or 7. For the other kneading and curing, a cement mortar for tile (hydraulic composition) and a molded product were prepared in the same manner as the concrete base cement mortar test. Using the prepared cement mortar, the water retention rate evaluation, the glazing workability evaluation, and the tile shift evaluation described below were performed, and further, the tile adhesion strength evaluation and the surface condition evaluation described below were performed using the molded product.

[Gypsum paste test]
To 99 parts by weight of gypsum (α-type hemihydrate gypsum) and 0.20 parts by weight of RS (lignin sulfonic acid, setting retarder), the types and amounts of admixtures shown in Table 8 were added and mixed thoroughly, A hydraulic material was prepared.
The amount of water added during kneading was adjusted so that the flow value was within the range of 168 to 173 mm according to the flow value evaluation described later. Table 8 shows the flow value. For the other kneading and curing, a gypsum paste (hydraulic composition) and a molded product were prepared and evaluated in the same manner as the concrete foundation cement mortar test.

1. Flow value evaluation method: In order to determine the amount of water in each cement mortar and gypsum paste in each cement mortar test and gypsum paste test, it was carried out before this test. Determined according to A 6916. The amount of water was determined so that the flow value was 180 to 185 mm in the concrete cement mortar test, 164 to 169 mm in the tile cement mortar test, and 168 to 173 mm in the gypsum paste test.
2. Water retention rate evaluation method: According to JIS A 6916 water retention test method (filter paper method), the water spread after 60 minutes and the inner diameter of the ring form are measured, and the water retention rate Rw (%) is calculated by the following formula (3 ). A high water retention rate indicates that the hydraulic composition has strong water retention, and a low water retention rate indicates poor water retention.
Rw = (Lr / L60) × 100 (3)
(Where, Rw: water retention rate (%), L60: moisture spread after 60 minutes (mm), Lr: inner diameter (mm) of ring mold)

3. Evaluation method of glazing workability: Each cement mortar or gypsum paste was glazed, and the heel elongation property, glazing property and chopping property were evaluated according to the following criteria (sensory test). The tearability was evaluated only in the tile cement mortar test.
Judgment criteria A: Very good.
○: Good.
Δ: Normal.
X: Bad.
4). Mortar adhesive strength evaluation method: Concrete ground cement mortar was applied to a concrete plate for sidewalk (JIS A 5304, 300 × 300 × 60 mm) at a thickness of 1 mm in a horizontal place. Using the molded product after curing for one week, the mortar adhesive strength was determined using the Kenken-type adhesive strength tester (manufactured by Yamamoto Ushiki Co., Ltd.) and used as the evaluation result.

5. Surface condition evaluation method: Applying each cement mortar or gypsum paste to a concrete plate for sidewalk at a predetermined thickness in a horizontal place, curing for one week, and then determining the degree of roughness by finger touch observation according to the following criteria evaluated. The applied thickness was 1 mm for the concrete base cement mortar test or the gypsum paste test, and 5 mm for the tile cement mortar test.
Judgment criteria ○: Good without roughness.
X: Rough and defective.
6). Tile displacement evaluation method: Apply a cement mortar for tiles to a concrete plate for sidewalks at a thickness of 5mm in a horizontal place, attach a porcelain small-mouth tile, attach a 200g weight, hold it for 60 seconds after making it vertical did. Thereafter, the degree of tile displacement was evaluated according to the following criteria.
Judgment criteria ○: No deviation.
Δ: Slightly off.
X: Sliding from the pasting surface.

  5. Tile adhesion strength evaluation method: In the above-mentioned tile displacement evaluation method, after applying cement mortar for tiles with a thickness of 5 mm, small tiles are applied every elapsed time (immediately, after 30 minutes) based on the time after finishing the mortar surface. Crimped. Using the molded article after curing for one week, the bond strength for each elapsed time was determined using the Kenken-type adhesive strength tester (manufactured by Yamamoto Uchiki Co., Ltd.) and used as the evaluation result.

[Condensation test]
With the formulation shown in Table 9, a hydraulic material and an admixture were added and mixed well to prepare a hydraulic material. The weight ratio of the admixture to the hydraulic substance was the same as that in the concrete base cement mortar test so that it could be compared correspondingly regardless of the presence or absence of the fine aggregate and the adhesion-imparting agent. Water was added to the hydraulic material and sufficiently kneaded for 2.5 minutes with a mortar mixer to prepare a cement paste as a hydraulic composition. The setting test was performed according to JIS R 5201. The amount of water added during kneading was determined by adjusting the softness as described in each JIS so that the softness was within the range of 6 ± 1 mm. The setting time was evaluated from the start time and the end time.

[Example 2-1 and Comparative Example 2-1]
In Example 2-1, cement (65 parts by weight), silica sand No. 8 (32.5 parts by weight) and admixture α-1 (0.084 parts by weight) were mixed to obtain a hydraulic material. The EVA emulsion (2.2 parts by weight, in terms of solid content) was directly dispersed in water (26.1 parts by weight). Thereafter, water in which an EVA emulsion was dispersed was added to the hydraulic material to obtain a concrete base cement mortar. The obtained cement mortar was cured to obtain a molded product. The above evaluation was performed on Example 2-1. The results are shown in Table 5.
Comparative Example 2-1 was the same as Example 2-1 except that the admixture α-1 (0.084 parts by weight) of Example 2-1 was changed to admixture β-1 (0.130 parts by weight). Thus, a hydraulic material, a cement mortar and a molded product were obtained. As a conventional formulation of Example 2-1, the above-described evaluation was performed on Comparative Example 2-1. The results are shown in Table 5.

In Example 2-1, although the blending amount of the admixture was smaller than that of Comparative Example 2-1, the water retention rate of the obtained cement mortar, the coating workability, and the mortar adhesion of the molded product The strength and surface condition were equal to or greater than those of Comparative Example 2-1. Of the wrinkle coating workability, wrinkle slip was particularly better than that of Comparative Example 2-1.
[Examples 2-2 to 2-3 and Comparative Example 2-2]
In Examples 2-2 to 2-3 and Comparative Example 2-2, the examples are the same as in Example 2-1, except that the type and amount of the admixture and the amount of water are changed as shown in Table 5. In the same manner as in 2-1, a hydraulic material, a cement mortar, and a molded product were obtained, and the above evaluation was performed.

In Examples 2-2 to 2-3, the water retention rate, glazing workability, and molding of the obtained cement mortar were reduced, although the blending amount of the admixture was smaller than that of Comparative Example 2-1. The mortar adhesive strength and surface state of the product were equal to or higher than those of Comparative Example 2-1.
In Comparative Example 2-2 containing no C component in the present invention, the mortar coating workability (particularly, cocoon elongation) of the cement mortar and the surface state of the molded product were inferior to those of Example 2-1 and Comparative Example 2-1. Furthermore, excessive water thickening was exhibited, and it was necessary to add more water to adjust the flow value.

[Example 3-1 and Comparative example 3-1]
In Example 3-1, cement (50 parts by weight), silica sand No. 5 (10 parts by weight), silica sand No. 6 (40 parts by weight) and admixture α-4 (0.105 parts by weight) were mixed to be hydraulic. Obtained material. Water (20.0 parts by weight) was added to the obtained hydraulic material to prepare a cement mortar for tiles. The obtained cement mortar was cured to obtain a molded product. The above evaluation was performed on Example 3-1. The results are shown in Table 6.
Comparative Example 3-1 was the same as Example 3-1 except that the admixture α-4 (0.105 parts by weight) of Example 3-1 was changed to admixture β-2 (0.150 parts by weight). Thus, a hydraulic material, a cement mortar and a molded product were obtained. As a conventional formulation of Example 3-1, the above-described evaluation was performed on Comparative Example 3-1. The results are shown in Table 6.

In Example 3-1, although the blending amount of the admixture was smaller than that of Comparative Example 3-1, the water retention of the obtained cement mortar, glazing workability, tiles displacement, and the molded product The tile adhesive strength and the surface state were equal to or higher than those of Comparative Example 3-1. Of the glazing workability, the glazing slip was particularly good as compared with Comparative Example 3-1.
[Example 3-2 and Comparative Examples 3-2 to 3-7]
In Example 3-2 and Comparative Examples 3-2 to 3-7, except that the type and amount of the admixture and the amount of water in Example 3-1 were changed as shown in Table 6 or 7, respectively. A hydraulic material, a cement mortar, and a molded product were obtained in the same manner as in Example 3-1, and the above evaluation was performed.

In Example 3-2, although the blending amount of the admixture was smaller than that of Comparative Example 3-1, the water retention of the obtained cement mortar, the glazing workability, the tile shift, and the molded product The tile adhesive strength and the surface state were equal to or higher than those of Comparative Example 3-1. Of the glazing workability, the glazing slip was particularly good as compared with Comparative Example 3-1.
In Comparative Example 3-2 that does not contain the C component in the present invention, the mortaring workability (particularly, flaw cutting) and tile displacement of the cement mortar were inferior to those of Example 3-2 and Comparative Example 3-1.

In Comparative Example 3-3, the water retention rate and tile adhesive strength (particularly when tiles were attached after 30 minutes) were poor compared to Examples 3-1 to 3-2 and Comparative Example 3-1. In Comparative Example 3-4, the amount of the admixture was increased as compared with Comparative Example 3-3, so that the glazing workability (particularly wrinkle slipping and flaw cutting) deteriorated, and further, excessive thickening was exhibited and the flow value was reduced. Since more water was required to be combined, the water retention was not improved much. That is, it was not possible to use only a high-viscosity water-soluble cellulose ether as an admixture and reduce the blending amount to exhibit performance equal to or higher than that of conventional blending.
In Comparative Example 3-5 in which only B2 (malto-oligosaccharide mixture, number average molecular weight: 1,670; manufactured by Matsutani Chemical Industry Co., Ltd., trade name: Paindex # 2) corresponding to component B in the present invention was used as an admixture. Compared with Example 3-2 and Comparative Example 3-1, almost all evaluation results were poor, and in water retention evaluation, the entire surface of the filter paper spread within 10 minutes from the start of the test, and no water retention was exhibited.

In Comparative Example 3-6 using b1 (methylcellulose, number average molecular weight: 18,000) as a comparison of the B component in the present invention, the water retention rate and tile adhesive strength (particularly at the time of applying the tile after 30 minutes) are shown in Example 3. -1 and Comparative Example 3-1.
In Comparative Example 3-7 using b2 (iota carrageenan sodium salt) as a comparison of the B component in the present invention, the wrinkle coating workability (particularly wrinkle elongation) deteriorates, and further, excessive thickening is exhibited and the flow. Since it was necessary to add more water to match the values, water retention was also poor compared to Examples 3-1 to 3-2 and Comparative Example 3-1.

註 1) The water retention rate could not be measured because it spread over the entire filter paper within 10 minutes of the start of the test.

[Example 4-1 and Comparative Example 4-1]
In Example 4-1, a hydraulic material was obtained by mixing gypsum (99 parts by weight), RS (0.20 parts by weight) and admixture α-1 (0.39 parts by weight). Water (35.8 parts by weight) was added to the obtained hydraulic material to prepare a gypsum paste. The obtained gypsum paste was cured to obtain a molded product. The above evaluation was performed on Example 4-1. The results are shown in Table 8.
Comparative Example 4-1 is the same as Example 4-1 except that the admixture α-1 (0.39 parts by weight) of Example 4-1 is changed to the admixture β-1 (0.60 parts by weight). Thus, a hydraulic material, a gypsum paste and a molded product were obtained. As a conventional formulation of Example 4-1, the above-described evaluation was performed on Comparative Example 4-1. The results are shown in Table 8.

In Example 4-1, the water retention rate of the obtained gypsum paste, the coating workability, and the surface state of the molded product, although the blending amount of the admixture was smaller than that of Comparative Example 4-1. Was equal to or greater than that of Comparative Example 4-1. Of the glazing workability, the slidability was particularly good as compared with Comparative Example 4-1.
[Example 4-2]
In Example 4-2, the hydraulic material is the same as in Example 4-1, except that the type and amount of the admixture and the amount of water are changed as shown in Table 8 in Example 4-1. A gypsum paste and a molded product were obtained, and the above evaluation was performed.

  In Example 4-2, although the blending amount of the admixture is smaller than that of Comparative Example 4-1, the water retention rate of the obtained gypsum paste, the wiping workability, and the surface state of the molded product Was equal to or greater than that of Comparative Example 4-1.

[Example 5-1 and Comparative Example 5-1]
In Example 5-1, a hydraulic material was obtained by mixing cement (65 parts by weight) and admixture α-1 (0.084 parts by weight). Water (19.1 parts by weight) was added to the obtained hydraulic material to prepare a cement paste. The above evaluation was performed on Example 5-1. The results are shown in Table 9.
In addition, the mixing | blending of the hydraulic material of Example 5-1 is mixing | blending except the fine aggregate and the adhesive imparting agent among the mixing | blendings of Example 2-1, and the weight ratio of the admixture with respect to a hydraulic substance changes. No match. Example 5-1 shows an indication of the setting time of Example 2-1.

In Comparative Example 5-1, Example 5-1 was used except that the admixture β-1 (0.130 parts by weight) was replaced with the admixture α-1 (0.084 parts by weight) of Example 5-1. In the same manner as above, a hydraulic material and a cement paste were obtained. As a conventional formulation of Example 5-1, the above-mentioned evaluation was carried out for Comparative Example 5-1. The results are shown in Table 9. Comparative Example 5-1 shows an indication of the setting time of Comparative Example 2-1.
As shown in Table 9, the setting time of Example 5-1 was delayed by about 1 hour as compared with Comparative Example 5-1, which was a conventional formulation.

[Examples 5-2 to 5-3]
Examples 5-2 to 5-3 are the same as Example 5-1 except that the type and amount of admixture and the amount of water are changed as shown in Table 9 in Example 5-1. Thus, a hydraulic material and a cement paste were obtained, and the above evaluation was performed. Examples 5-2 to 5-3 show guidelines for the setting time of Examples 2-2 to 2-3, respectively.
As shown in Table 9, the setting time in Examples 5-2 to 5-3, as shown in Table 9, can be increased by 20 minutes or delayed by 75 minutes, as compared with Comparative Example 5-1, which is a conventional formulation. The closing time could be 10 minutes earlier or 50 minutes slower. In other words, the setting time could be adjusted.

In any of the above tables, the following abbreviations are used.
A1: Hydroxypropylmethylcellulose A2: Hydroxypropylmethylcellulose A3: Hydroxyethylmethylcellulose a1: Hydroxypropylmethylcellulose a2: Hydroxypropylmethylcellulose B1: β-cyclodextrin (Molecular weight: 1,150, manufactured by Nippon Shokuhin Kako Co., Ltd., trade name: Celdex B-100)
B2: Maltooligosaccharide mixture (number average molecular weight: 1,670, manufactured by Matsutani Chemical Industry Co., Ltd., trade name: Paindex # 2)
b1: Methylcellulose (number average molecular weight: 18,000)
b2: iota carrageenan sodium salt C1: sodium lauryl sulfate (trade name: EMAL O, 註 2 manufactured by Kao Corporation)
C2: Polycarboxylic acid (manufactured by NOF Corporation, trade name: Polystar OMP, 註 2))
C3: Acrylic amide copolymer (manufactured by Sankyo Kasei Kogyo Co., Ltd., trade name: Sunpoly A-530, 註 2))
C4: Polydimethyldiallylammonium chloride (manufactured by Nisshin Sangyo Co., Ltd., trade name: Nissin Flock D95, 註 2))
Cement: Ordinary Portland cement Gypsum: α-type hemihydrate gypsum silica sand No. 5: Fine aggregate silica sand No. 6: Fine aggregate silica sand No. 8: Fine aggregate EVA emulsion: Ethylene-vinyl acetate copolymer emulsion (adhesive agent, Solid content concentration: 45% by weight)
RS: Lignin sulfonate (setting retarder)

Note 2) 0.01 g or more dissolved in 100 ml of ion exchange water at 20 ° C.

Claims (8)

A component consisting of a water-soluble cellulose ether having a viscosity of 8,000 to 50,000 mPa · s at 20 ° C. in a 1% by weight aqueous solution, and a B component consisting of a sugar having a molecular weight of 450 to 5,000 and / or a derivative thereof, and a component C consisting of thickeners and / or flow improvers seen including,
The weight ratio of the A component and the B component (A component / B component) is in the range of 30/70 to 95/5,
The weight ratio of the C component is in the range of 0.01 to 2% with respect to the total amount of the A component and the B component,
The thickener is at least one selected from an acrylic amide polymer, a copolymer of dimethylamine and epichlorohydrin (salt), and a polymer of dimethyldiallylammonium salt,
The fluidity improver is at least one selected from polycarboxylic acids and anionic surfactants,
Admixture for hydraulic composition. The admixture for hydraulic composition according to claim 1 , wherein the component A is at least one selected from water-soluble alkyl cellulose, water-soluble hydroxyalkyl alkyl cellulose and water-soluble hydroxyalkyl cellulose. The anionic surfactants are alkylbenzene sulfonic acid (salt), alkyl sulfonic acid (salt), alkenyl sulfonic acid (salt), alkylbenzene sulfate (salt), alkyl sulfate (salt) and alkenyl sulfate (salt). The admixture for hydraulic composition according to claim 1 or 2 , which is at least one selected from the group consisting of: A hydraulic composition admixture according to any one of claims 1 to 3, and a hydraulic substance, the hydraulic material. The hydraulic material according to claim 4 , wherein the hydraulic substance is cement and / or gypsum. The hydraulic material of Claim 4 or 5 whose weight ratio of the said admixture for hydraulic compositions which occupies for the said hydraulic material is 0.003 to 2 weight%. It claims 4 to become by mixing a hydraulic material and water according to any one of 6, the hydraulic composition. A molded product obtained by curing the hydraulic composition according to claim 7 .