JP2001097758A - Quick hardening type self-leveling composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a quick hardening type self-leveling composition capable of retaining higher fluidity than that of a conventionally used and already mixed quick hardening type self-leveling composition for a long period and having sufficient quick hardenability. SOLUTION: This quick hardening type self-leveling composition comprises a powdery cement dispersing agent prepared by adding a reducing inorganic compound and a reducing organic compound to a liquid consisting essentially of (A) a quick hardening cement, (B) a gypsum, (C) a defoaming agent and (D) a polycarboxylic acid-based polymer having a polyalkylene glycol chain, and then drying and powdering the resultant mixture. Thereby, the efficient execution can be carried out without deteriorating the accuracy of a horizontal plane even when the amount of placing is large and the opening of a placed surface is required in a short time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a self-leveling composition used as a floor base preparation or a top adjustment of a cloth base, which is capable of supplying materials other than water in a ready-mixed state. The present invention relates to a hard self-leveling composition.

[0002]

2. Description of the Related Art In a building, a method of troweling a mortar has conventionally been used as a method of horizontally adjusting a floor base or a top end of a foundation, but recently a self-leveling composition has been used. This allows for highly accurate and efficient construction. As the self-leveling composition used here, there is a cement-based self-leveling composition (hereinafter referred to as SL material). The SL material generally comprises cement, fine aggregate, and a cement dispersant, which are binders, and a thickener, an antifoaming agent, an expanding agent, a shrinkage reducing agent, and the like are added to this as necessary.

[0003] These materials are prepared in advance in the SL material, and are prepared and mixed at the construction site by adding water and used, and the SL material is manufactured at a factory and transported to the construction site by an agitator vehicle. Ready-mix type SL material
The pre-mixed SL material is mainly used as a material to adjust the floor base and the top end of the foundation horizontally, and the ready-mix type SL material is mainly used as a material to adjust the floor base of relatively large-scale buildings. ing. Of these, the already prepared SL material is kneaded and cast on site, so the required fluidity retention time is usually about 1 hour, and the cement dispersant used has a relatively low fluidity retention effect. A powder of a sulfonate formalin condensate or a powder of a melamine sulfonate formalin condensate is mainly used (JP-A-56-843).
No. 58, JP-A-4-369546).

Further, some SL materials are provided with quick-hardening properties by using cement or rapid-hardening material containing calcium aluminate as a main component (JP-A-10-23116).
No. 5, JP-A-2-302352), the opening time of the casting surface is shortened. In the past, quick-hardened ready-mixed SL materials were often used for repair materials in relatively small buildings, but in recent years they have been used in relatively large buildings to shorten the construction period. Therefore, it is desired to secure a high fluidity required for exhibiting self-leveling property for a longer time and to exhibit a sufficient quick-setting property. However, in order to ensure high fluidity for a long time in a fast-curing pre-formulated SL material containing a powdery cement dispersant containing a conventional naphthalene sulfonate formalin condensate or a melamine sulfonate formalin condensate as a main component. In addition, when the addition amount of the setting retarder or the cement dispersant is increased, or when the water-cement ratio is increased, there is a problem that the quick-setting property is impaired or the strength is reduced. Further, in a cement dispersant containing a sulfonate-based formalin condensate as a main component, formalin is a harmful substance, so that it must be restricted in handling and use thereof.

On the other hand, the cement dispersant containing a polycarboxylic acid-based polymer compound as a main component, which is used for a ready-mix type SL material, has problems such as a delay in curing time and a decrease in strength. It is possible to maintain the fluidity for a long time without causing such a dispersant, but since this dispersant is generally produced as an aqueous solution, it is impossible to previously mix it with the prepared SL material. For this reason, attempts have been made to powder a dispersant containing a polycarboxylic acid-based polymer compound as a main component.
In order to obtain a powdery dispersant having a high solubility in water, the insoluble gel is formed during the powder production process, and the obtained powder has stability in properties such as dispersing action. Was easy to lack. Also, a powdering method using a spray drying device (Japanese Patent No. 2669761) is known,
Because a large amount of inorganic powder must be used together, the content of the polycarboxylic acid-based polymer compound in the dispersant decreases,
There is a problem that the particles are adsorbed on the inorganic powder and the dispersing performance is lower than that when used in an aqueous solution state.

[0006]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to solve the above-mentioned problems and to provide a quick-setting cement system containing a powdery cement dispersant, which has a high fluidity retention effect and has sufficient quick-setting properties. It is to provide a self-leveling composition.

[0007]

The present inventors have conducted various studies and found that a reducing inorganic compound and a reducing organic compound were added to a solution containing a polycarboxylic acid polymer compound having a polyalkylene glycol chain. By dry powdering, a powdery cement dispersant excellent in fluidity can be obtained efficiently.Furthermore, when this powdery dispersant is used together with a quick-setting cement, gypsum and an antifoaming agent, the fluidity retention effect is high and sufficient It has been found that a quick-setting self-leveling composition having excellent fast-curing properties can be obtained, and the present invention has been completed.

That is, the present invention provides (A) a quick-setting cement,
Adding a reducing inorganic compound and a reducing organic compound to a liquid mainly composed of (B) gypsum, (C) an antifoaming agent, and (D) a polycarboxylic acid polymer having a polyalkylene glycol chain; Next, the present invention provides a quick-setting self-leveling composition containing a powdery cement dispersant obtained by drying and powdering.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The powdery cement dispersant (D) blended in the quick-setting type self-leveling composition of the present invention comprises:
It is obtained by adding a reducing inorganic compound and a reducing organic compound to a liquid containing a polycarboxylic acid-based polymer compound having a polyalkylene glycol chain as a main component as described above, and pulverizing the solution into a dry powder. The polycarboxylic acid-based polymer compound having a polyalkylene glycol chain used here is not particularly limited. For example, (D ¹ ) a (meth) acrylic acid-based copolymer having a polyalkylene glycol chain and (D ² ) A maleic acid-based copolymer having a polyalkylene glycol chain (however, in the case of (D ² ), excluding a polyvalent metal salt) and the like, and these may be used alone or in combination of two or more. .

Of these, (D ¹ ) includes a group —CO
Preferred are OM (wherein M represents a hydrogen atom, an alkali metal, an alkaline earth metal, ammonium or an organic amine) and a (meth) acrylic acid-based copolymer having a polyalkylene glycol chain. As (D ² ), a polyalkylene glycol alkenyl ether-maleic anhydride copolymer (excluding polyvalent metal salts) and the like are preferred.

M in the group -COOM of the (D ¹ ) (meth) acrylic acid-based copolymer is a hydrogen atom; an alkali metal such as sodium or potassium; an alkaline earth metal such as calcium or magnesium; ammonium or an organic compound. Amines are preferred.

In the above (D ¹ ) and (D ² ), the polyalkylene glycol chain includes —O (CH ₂ CH)
Those represented by (R ^a ) O) _b — are preferred. Where ^Ra
Represents a hydrogen atom or a methyl group, and b is 2 to 200, preferably 5 to 109, particularly preferably 20 to 109, and more preferably 30 to 109.

Further, (D ¹ ) a preferable copolymer of (meth) acrylic acid-based copolymer comprises 40 to 80 mol% of a structural unit (1) represented by the following formula (1) in all the structural units:
The structural unit (2) represented by the following formula (2) is 2 to 25 mol%, and the structural unit (3) represented by the following formula (3) is 3 to 20 mol%.
Mole% and a number average molecular weight of 2,000 having a structural unit (4) represented by the following formula (4) at a ratio of 1 to 45 mole%.
50,000 (meth) acrylic acid copolymers.

[0014]

Embedded image

[0015] ^{wherein, R 1, R 2, R} 4 and R ⁵ are the same or different and represent a hydrogen atom or a methyl group, R ³ and R ⁶ represents an alkyl group having 1 to 3 carbon atoms, M ¹ represents a hydrogen atom, an alkali metal, alkaline earth metal, ammonium or organic amine, X is -SO ₃ M ² or -O-
Ph-SO ₃ M ² (where M ² represents a hydrogen atom, an alkali metal, an alkaline earth metal, ammonium or an organic amine, and Ph represents a phenylene group);
Indicates an integer of 200)

In the above formulas (1) to (4), R ¹ , R ² , R ⁴
And R ⁵ are preferably a methyl group. R ³ and R ⁶
As a methyl group, an ethyl group, an n-propyl group, an i-
A propyl group is exemplified, and a methyl group is particularly preferred. Further, as M ¹ , sodium, potassium, calcium, magnesium, alkanolamine and the like are preferable,
Particularly, sodium is preferable from the viewpoint of solubility in water. Examples of M ² in the group X include alkali metal atoms such as sodium and potassium, alkaline earth metals such as calcium and magnesium, and organic amines such as alkanolamines such as ammonium and ethanolamine. As Among these X, -SO ₃ Na are preferred. In the formula (4), n is 2 to 200,
109 is preferred, especially 20 to 109, more preferably 30 to 1
09 is preferred. The content of the structural unit (1) is preferably from 40 to 80 mol%, and particularly preferably from 45 to 75 mol%. The content of the structural unit (2) is preferably 2 to 25 mol%, and particularly preferably 5 to 20 mol%. The content of the structural unit (3) is preferably from 3 to 20 mol%, particularly preferably from 5 to 15 mol%. Further, the content of the structural unit (4) is preferably from 1 to 45 mol%, particularly preferably from 3 to 40 mol%. In addition, mol% of a structural unit shows mol% of each structural unit when all the structural units of (1)-(4) are 100 mol%.

In particular, a preferable (D ¹ ) (meth) acrylic acid-based copolymer is such that the structural unit (5) represented by the following formula (5) is 40 to 70 mol% in all the structural units. A structural unit (6) represented by the following formula (6) is
Mol%, the structural unit (7) represented by the following formula (7) is 1 to
Number average molecular weight having 20 mol%, 1 to 30 mol% of the structural unit (8) represented by the following formula (8), and 1 to 30 mol% of the structural unit (9) represented by the following formula (9). 2
000 to 50,000 (meth) acrylic acid-based copolymers.

[0018]

Embedded image

Wherein R ⁷ , R ⁸ , R ¹⁰ , R ¹¹ , R ¹³ and R ¹⁴ are the same or different and each represent a hydrogen atom or a methyl group, and R ⁹ , R ¹² and R ^{15 each} have 1 to 1 carbon atoms. 3 represents an alkyl group; M ³ represents a hydrogen atom, an alkali metal, an alkaline earth metal, ammonium or an organic amine;
SO ₃ M ⁴ or —O—Ph—SO ₃ M ⁴ (where M ⁴ represents a hydrogen atom, an alkali metal, an alkaline earth metal, ammonium or an organic amine, and Ph represents a phenylene group), and m Represents an integer of 2 to 200, and p represents 2 to 1
09 represents an integer. ]

In the above formulas (5) to (9), R⁷, R⁸,
R^Ten, R¹¹, R¹³And R¹⁴Is preferably a methyl group. Ma
R⁹, R¹²And R^FifteenAs a methyl group, ethyl
Group, n-propyl group and i-propyl group.
Among them, a methyl group is preferred. Also, M ^ThreeAnd M^FourAs
Is sodium, potassium, calcium, magnesium
And alkanolamines are preferred, especially sodium
Is preferred. The group Y is -SO_ThreeNa is preferred
No. (8) In the formula, m is 2 to 200,
Is preferable, especially 20 to 109 is preferable, and 30 is more preferable.
To 109 are preferable. Further, p in the expression (9) is 2 to 10.
9, but preferably 5 to 50. Structural unit (5) is 4
It is preferably from 0 to 70 mol%, particularly from 45 to 65 mol%.
Preferably it is mol%. Structural unit (6) is 5 to 3
0 mol%, preferably 8 to 23 mol%.
Preferably, there is. Structural unit (7) is 1 to 20 mol%
Is preferable, and especially 1 to 15 mol%.
Is preferred. The constituent unit (8) should be 1 to 30 mol%.
And particularly preferably 5 to 25 mol%.
No. Further, the constitutional unit (9) is 1 to 30 mol%.
Is preferred, and particularly preferably 3 to 25 mol%.
No. In addition, mol% of a structural unit is all the structures of (5)-(9)
Each constituent unit when the total of the units is 100 mol%
% By mole.

The (meth) acrylic acid-based copolymer comprising the above structural units includes a number average molecular weight of 2,000 to 5,000.
0 (GPC method, polyethylene glycol equivalent) is preferable, and 3500 to 30,000 is more preferable.

On the other hand, maleic acid-based copolymers having (D ² ) alkylene glycol chains include methyl polyethylene glycol vinyl ether-maleic anhydride copolymer, polyethylene glycol allyl ether-maleic anhydride copolymer, methyl polyethylene glycol Allyl ether-maleic anhydride copolymer, methyl methacrylate polyethylene glycol-maleic acid copolymer and the like can be mentioned. The preferred number average molecular weight (GPC method, calculated as polyethylene glycol) of the copolymer (D ² ) is 30.
It is preferably from 2000 to 200,000, particularly preferably from 3000 to 80000.

Examples of the reducing inorganic compound include sulfite, nitrite, thiosulfate and the like. As these salts, alkali metal salts and alkaline earth metal salts are preferable. Although it is not clear why the addition of the reducing inorganic compound can prevent gelation during kneading and stirring in the drying step, the radical reaction in which the reducing inorganic compound remains in the polycarboxylic acid-based copolymer-containing liquid is initiated. It is considered to deactivate the agent. Therefore, the amount of the reducing inorganic compound to be added may be determined according to the type and amount of the radical reaction initiator remaining in the mixture, and usually, the solid content of the radical reaction initiator used in the synthesis of the polymer compound is determined. (Mol% value) or less, but the amount (mol% value) of the solid content of the remaining radical reaction initiator
It is desirable that the amount is not less than the amount capable of deactivating the oxidizing power of the residual radical reaction initiator.

The reducing organic compound is preferably an amine compound, especially an alkanolamine. Specifically, triethanolamine, diethanolamine, monoethanolamine, isopropanolamine, N, N
Alkanolamines such as diethylethanolamine,
Examples thereof include alkylamines such as sec-butylamine, and diamines such as ethylenediamine. By the addition of the reducing organic compound, the load on the kneading stirrer is greatly reduced, and the COD value of the distilled water discharged at the time of dry powder is reduced (200 mg / L or less).

The amount of each of the reducing inorganic compound and the reducing organic compound is 0.01 to 2.5% by weight, particularly 0.5 to 1% by weight, based on the solid content of the polycarboxylic acid-based polymer compound. 0.5% by weight is preferred. The addition of such a reducing organic compound reduces the load on the mixing stirrer in the drying and pulverization step, and also lowers the COD value of water distilled off during drying, because it is used as a crushing aid. It is presumed that the polymerization reaction proceeds at a low temperature near room temperature due to the amine effect while the unreacted monomer is consumed.

The powdery cement dispersant (D) used in the present invention can improve its hygroscopicity and blocking properties,
After drying to reduce measurement errors, in addition to the above essential components, a polyalkylene glycol, and a carbon number of 8 to 22
Or a salt thereof, or an inorganic powder.

Preferred examples of the polyalkylene glycol include polyethylene glycol having a molecular weight of 1,000 to 20,000, and polypropylene glycol having a molecular weight of 2,000 to 6,000. Among them, polyethylene glycol is particularly preferable, and further, the average molecular weight is 2,000.
Polyethylene glycol of ~ 4000 is preferred.

The fatty acid having 8 to 22 carbon atoms or a salt thereof may be saturated or unsaturated, and may be linear or branched. Specifically, caprylic acid, pelargonic acid, capric acid, undecylic acid, lauric acid,
Tridecylic acid, myristic acid, pentadecylic acid, palmitic acid, heptadecylic acid, stearic acid, nonadecanoic acid, arachiic acid, behenic acid, undecylenic acid, oleic acid, elaidic acid, setreic acid, erucic acid, brassic acid and salts thereof Can be As the salts of the above fatty acids, metal salts such as sodium, potassium, barium, calcium, zinc, aluminum and magnesium are preferable. In particular, stearic acid or a salt thereof is preferred,
Particularly preferred is calcium stearate. The compounding amount of these polyalkylene glycols and fatty acids having 8 to 22 carbon atoms or salts thereof is 0.2 to 30% by weight based on the solid content of the polycarboxylic acid polymer having a polyalkylene glycol chain, Particularly, 0.5 to 20% by weight is preferable.

As the inorganic powder, powders of inorganic salts such as calcium carbonate and calcium silicate, clay mineral powders such as kaolinite and bentonite, and fine powders such as blast furnace slag and fly ash can be used. Such an inorganic powder may be used up to about three times the solid content of the polycarboxylic acid polymer compound.

The liquid containing the polycarboxylic acid polymer as a main component may contain a solution or dispersion of water or an organic solvent.

Since the polycarboxylic acid polymer-containing liquid is usually an acidic liquid, sodium hydroxide, potassium hydroxide and calcium hydroxide are added after adding a reducing inorganic compound and a reducing organic compound. PH 7 to 9 by adding an aqueous solution of an alkali metal or alkaline earth metal such as
It is preferred to adjust to. If the pH is not adjusted, the polymer compound in the mixture is liable to undergo hydrolysis during the heating and drying treatment, and the COD value of water distilled off during drying increases. When the polycarboxylic acid-based polymer compound-containing solution has a pH of 7 to 9 from the beginning, it is not necessary to adjust the pH by adding a pH adjuster.

The drying is not particularly limited as long as it is a convection type drying apparatus such as a hot air type or a heat conduction type drying apparatus. Flash jet dryers are suitable. When the processed product is a high-concentration solution exceeding 40% or a material having high viscoelasticity, it is preferable to use a drying machine such as a kneading stirring dryer or a band-type continuous vacuum dryer. However, since the polycarboxylic acid-based polymer compound having a polyalkylene glycol chain may become viscous during the concentration process, from the viewpoint of powdering efficiency and the like, it is particularly preferable to carry out kneading and stirring to dry powder. . Kneading
The stirring temperature is preferably about 40 to 120 ° C, more preferably about 60 to 110 ° C. The kneading / stirring can be carried out in the air, but it is desirable to carry out the kneading in a reduced pressure or an inert gas atmosphere such as nitrogen or argon from the viewpoint of preventing deterioration. Further, it is preferable that after concentrating until the hardness becomes 30 ° or more, it is dried and pulverized while kneading and stirring with a horsepower of 0.5 kg / m ³ / rpm or more. By performing such a drying operation, a powdery dispersant can be obtained. The dried powder may be agglomerated into small agglomerates, but the agglomerates are fragile and can be easily formed into single particles with a slight crushing force.

(D) The powdered dispersant has an average particle diameter of 5 to 2,000 by an arbitrary pulverizing / classifying method for convenience in use.
It is desirable to adjust the thickness to μm, more preferably 10 to 500 μm. However, since the produced powdery dispersant (D) is relatively weak to heat, a pulverizer having low heat storage property is preferable, and specifically, a pin-type mill is preferable. There is also a pulverizer integrated with a screen for adjusting the particle size. However, since the heat of pulverization increases when unpulverized material stays, it is preferable to perform pulverization and classification separately.

If the amount of the powdery cement dispersant (D) thus obtained added to the self-leveling composition of the present invention is too small, no effect is obtained, and if it is too large, it causes setting retardation and strength reduction. 0.005 to 100 parts by weight (total of quick-setting cement, other cement and gypsum)
-5 parts by weight, particularly 0.01-3 parts by weight, is preferred.

As the quick-setting cement (A) used in the present invention, any cement can be used as long as it contains calcium aluminate as a main component. In particular, mono-calcium aluminate (CA) as a main component and Al ₂ O _{3 having a} content of 65% by weight or less is preferable, and in particular, an Al ₂ O ₃ content of ₃ % by weight or less.
More preferably, it is 0 to 45% by weight. The (A) fast-setting cement used in the present invention includes Portland cement (ordinary cement, early-strength cement, ultra-high-strength cement, moderate heat cement, sulfate-resistant cement, etc.) and mixed cement (blast furnace cement, fly ash cement, When used in combination with silica cement, etc.), it is more preferable in order to achieve both high fluidity and sufficient quick-setting properties. The mixing ratio when the quick-hardening cement and the ordinary cement are used in combination is preferably quick-hardening cement / normal cement = 1/99 to 90/10 (weight ratio),
More preferably, it is 3/97 to 50/50.

The gypsum (B) used in the present invention has an effect of improving fluidity and quick-setting, and can be expected to have an effect of reducing drying shrinkage. As (B) gypsum, any of anhydrous gypsum, hemihydrate gypsum and gypsum can be used, but anhydrous gypsum is most preferable from the viewpoint of fluidity, quick setting and drying shrinkage reduction. Further, the blending amount of the gypsum (B) is preferably 2 to 150 parts by weight, more preferably 10 to 70 parts by weight, based on 100 parts by weight of the quick-setting cement.

The defoaming agent (C) used in the present invention is for preventing floor swelling, dents and the like due to air bubbles.
As the defoaming agent (C), generally known defoaming agents such as silicone-based or nonionic surfactants can be used. The amount used is preferably 0.01 to 0.6 parts by weight, particularly preferably 0.05 to 0.4 parts by weight, per 100 parts by weight of the binder.

The quick-hardening self-leveling composition of the present invention may further contain (E) a thickener, (F) a setting modifier and (G) a fine aggregate.

The thickener (E) used in the present invention is used for the purpose of preventing material separation and drying shrinkage. Specific examples include methylcellulose, hydroxyethylcellulose, carboxymethylcellulose and the like.
(E) The compounding amount of the thickener is 0.005 to 100 parts by weight of the binder in view of fluidity and self-leveling property.
-0.6 parts by weight, particularly preferably 0.01-0.4 parts by weight.

As the (F) setting regulator used in the present invention, compounds having a setting promoting action include lithium carbonate, lithium hydroxide, lithium chloride, lithium nitrate, potassium carbonate, potassium hydroxide, sodium carbonate and sodium hydroxide. And the like can be suitably used, and lithium carbonate is particularly preferable. The compounding amount of these compounds having a setting promoting action is 0.00 0.00 parts by weight to the binder.
5 to 2 parts by weight is preferable from the viewpoint of the fluidity and the effect of accelerating the setting. Particularly preferably, it is 0.05 to 0.5 part by weight. As the compound having a setting retarding action, oxycarboxylic acids (including salts thereof) such as tartaric acid, citric acid, malic acid and gluconic acid can be suitably used, and tartaric acid or citric acid is particularly preferable. The compounding amount of the compound having a setting retarding effect is 0.00.0 parts by weight based on 100 parts by weight of the binder.
The amount is preferably from 0.5 to 3 parts by weight, particularly preferably from 0.03 to 1 part by weight, from the viewpoint of quick-setting properties and the effect of retarding setting.

As the fine aggregate (G) used in the present invention, river sand, sea sand, land sand, crushed sand, silica sand and the like can be used, and these sands are preferably dry sands. Further, fly ash, blast furnace slag, calcium carbonate, silica fume and the like can be used in combination with the above sand. The fine aggregate to be blended preferably has a particle size of 5 mm or less and an FM of about 1.5 to 3.0. The use amount of the fine aggregate is preferably 30 to 300 parts by weight, and more preferably 60 to 1 part by weight based on 100 parts by weight of the binder from the viewpoint of fluidity and strength.
50 parts by weight are particularly preferred.

In addition to the above-mentioned materials, the quick-setting type self-leveling composition of the present invention may optionally contain an expanding material, a shrinkage reducing agent and the like for the purpose of preventing shrinkage and cracking. In addition, an extender and various admixtures can be used as long as they do not adversely affect the physical properties.

The quick-setting type self-leveling composition of the present invention is usually provided in a state where the above-mentioned materials are prepared, and kneaded with water using a mixer at a construction site, and then poured. The mixer used here is not particularly limited, and the amount of water added is usually 30 to 100 parts by weight based on 100 parts by weight of the binder.
Parts by weight.

[0044]

EXAMPLES Hereinafter, the present invention will be described in more detail by way of examples, but the present invention is not limited thereto. The materials used in the examples are as follows.

[Materials Used] (1) Cement-Rapid-hardening cement: Siman Fondue Lafarge (alumina cement manufactured by Lafarge Aluminate) Table 1 shows the chemical components of the quick-hardening cement (Siman Fondue Lafarge).

[0046]

[Table 1]

Normal Portland cement (manufactured by Taiheiyo Cement Co., Ltd.) (2) Gypsum type II anhydrous gypsum (Brain specific surface area: 7000 cm ² / g) (3) Fine aggregate silica sand (Yamagata) M = 2.3 (4) Powdery cement dispersant The powdery cement dispersant according to the present invention The polycarboxylic acid polymer compound used in the production of the powdery cement dispersant used in the present invention is shown below.

[0048]

[Table 2]

[0049]

[Table 3]

[Production method of powdery cement dispersant according to the present invention] To each of 800 g of a liquid mixture having a solid content concentration of 45% and containing a polymer compound shown in Tables 2 and 3 as a main component,
10% by weight aqueous sodium hydroxide solution 7 for pH adjustment
5.2 g was added, and the mixture was stirred at room temperature for about 3 minutes. Next, sodium sulfite and triethanolamine as a reducing agent are added in an amount of 0.5 to 2% by weight based on the solid content, and the mixture is stirred for 3 minutes. The mixture was concentrated and dried while kneading under a reduced pressure of 30 torr. The obtained powder is pulverized with a pulverizer (MCG180 manufactured by Matsubara Co., Ltd.) to obtain a particle size of 50 to 500.
μm, powdered cement dispersants (1) and (2) shown in Table 4 were obtained.

[0051]

[Table 4]

Conventional powdery cement dispersant Melment F10 (melamine sulfonate formalin condensate manufactured by SKW East Asia Co., Ltd.) (5) Thickener Metroze (Shinetsu Chemical Co., Ltd. cellulose-based thickener) ) Antifoaming agent SN-Deformer 14HP (manufactured by San Nopco Co., Ltd.) (7) Setting regulator ・ Setting accelerator: lithium carbonate (commercially available) ・ Setting retarder: tartaric acid (commercially available)

Table 5 shows examples of the composition of the quick-setting type self-leveling composition of the present invention.

[0054]

[Table 5]

The performance test of the quick-setting type self-leveling composition of the present invention was performed as follows. [Test Example] 21 parts by weight of water was added to 100 parts by weight of the material prepared according to the composition shown in Table 5, and the mixture was mixed using a Hobart mixer for 3 minutes. The value is 1 from immediately after kneading until 60 minutes.
It was measured every 0 minutes. The setting time and the compressive strength were measured for the evaluation of the quick setting property. The test results are shown in Tables 6 and 7.

[Method of Measuring Flow Value] The flow value was measured in the following manner according to the Architectural Institute of Japan JASS15M-103 (quality standard of self-leveling material). A pipe made of vinyl chloride (inner volume: 50 mL) having an inner diameter of 50 mm and a height of 51 mm is placed on a glass plate having a thickness of only 5 mm, filled with the adjusted quick-hardening self-leveling compound, and then pulled up. After the spread had stopped, the diameter in two perpendicular directions was measured, and the average value was taken as the flow value. In the measurement of the change with time in the flow value, the slurry was kneaded for 20 seconds using a Hobart mixer before the measurement, and then the measurement was performed.

[Method of measuring setting time] JIS R-520
1 Measured according to “Physical test method of cement”.

[Method of measuring compression strength] JIS R-520
1 Measured at a material age of 1 day according to “Physical test method of cement”.

[0059]

[Table 6]

[0060]

[Table 7]

From Tables 6 and 7, it can be seen that the quick-setting type self-leveling composition of the present invention can maintain high fluidity for a long period of time and has a sufficient speed as compared with those using a conventional powdery dispersant. It turns out that it has hardness.

[0062]

The quick-setting self-leveling composition of the present invention can maintain high fluidity for a long time as compared with the previously prepared quick-setting self-leveling composition which has been conventionally used. It has sufficient quick-setting properties. This makes it possible to perform efficient construction without deteriorating the accuracy of the horizontal plane even when the casting amount is large and the casting surface needs to be opened in a short time.

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C04B 22:14 C04B 22:14 Z 24:12) 24:12) A 103: 12 103: 12 103: 32 103: 32 103: 50 103: 50 111: 62 111: 62 (72) Inventor Kazuhisa Tsukada 2-4-2 Daisaku, Sakura-shi, Chiba Pref. Inside the Sakura Research Institute of Pacific Cement Co., Ltd. 2-4-2, Taisaku-shi, Taiheiyo Cement Co., Ltd. Sakura Research Institute (72) Inventor Koichi Soeda 2-4-2, Daisaku, Sakura-shi, Chiba Pref. PB20

Claims (4)

[Claims] (A) quick-setting cement, (B) gypsum,
A reducing inorganic compound and a reducing organic compound are added to a liquid mainly composed of (C) an antifoaming agent and (D) a polycarboxylic acid-based polymer compound having a polyalkylene glycol chain, and then dry-pulverized. A quick-setting type self-leveling composition containing a powdery cement dispersant obtained by the above method. 2. The quick-setting type self-leveling composition according to claim 1, further comprising (E) a thickener, (F) a setting regulator, and (G) fine aggregate. 3. The quick-setting self-setting composition according to claim 1, wherein (A) the quick-setting cement mainly comprises monocalcium aluminate (CA) and has an Al ₂ O ₃ content of 65% by weight or less. Leveling composition. 4. The method of claim 2, wherein (F) the coagulant comprises an alkali metal salt and an oxycarboxylic acid.
Or the quick-setting self-leveling composition according to 3 above.