JPH09221350A - Cement composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cement compsn. excellent in self-levelability and work efficiency. SOLUTION: This cement compsn. contains cement, a resin-contg. aq. dispersion liq., 0.01-10wt.% associable thickener and 0.01-10wt.% surfactant having two or more sulfonic acid groups in one, molecule or cationic surfactant. The ratio of the thickener to the (cationic) surfactant is 0.1-15.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a cement composition, and more particularly to a cement composition having excellent self-leveling properties and workability.

[0002]

2. Description of the Related Art Conventionally, as a waterproofing material for buildings, aquariums, etc., a finishing material, and a ground control material, a mixture of cement with an aqueous resin dispersion, and a composition of further aggregate have been used as a seamless coating. It is used by taking advantage of the fact that a film can be obtained, that it can be easily applied to small areas and complicated complicated places, that it cures without the need for heating and fire, and that it does not use solvents. There is.

[0003]

According to these cement compositions, a coating film having elasticity and water resistance can be formed, but it can be applied by spraying, trowel coating, roller coating, etc. onto a concrete slab or the like. If you do, the surface will not be uniform,
In particular, when the surface is reworked after a lapse of time after construction, the surface becomes uneven and it is difficult to make it uniform, so that the so-called self-leveling property is not sufficient and the workability is poor, and these improvements are desired. It is an object of the present invention to solve the above conventional problems and provide a cement composition having excellent self-leveling properties.

[0004]

Means for Solving the Problems As a result of intensive investigations by the present inventors, an aqueous resin dispersion, an associative thickener, and a surfactant having two or more sulfonic acid groups in one molecule have been added to cement. The above object could be achieved by blending with a cationic surfactant. That is, the first aspect of the present invention is: (A) component: cement (B) component: resin aqueous dispersion (C) component: associative thickener (D) component: 2 or more sulfonic acid groups in one molecule A composition containing a surfactant or a cationic surfactant having a content of 0.01 to 10% by weight of the component (C) and 0.01 to 1% of the component (D) in the composition.
A cement composition containing 0% by weight and having a ratio (C / D) of component (C) to component (D) of 0.1 to 15. Further, it is preferable that the composition further contains an aggregate as the component (E). Furthermore, the composition contains 100 parts by weight of the component (A) and 0.
It is preferable to contain 01 to 300 parts by weight.

BEST MODE FOR CARRYING OUT THE INVENTION

As the cement of the component (A) in the present invention, hydraulic lime; roman cement; natural cement;
Normal Portland cement, early strength Portland cement, super early strength Portland cement, moderate heat Portland cement, white Portland cement, etc. Portland cement; Alumina cement; Blast furnace cement; Silica cement; Pozzolan cement; Fly ash cement;
Specific examples include hydraulic cements such as special cements, slaked lime and dolomite plaster, calcined gypsum, anhydrous gypsum, hemihydrate gypsum, and hydraulic cements such as magnesia cement. These cements can be used alone or in combination of two or more.

The aqueous resin dispersion of component (B) in the present invention is an aqueous dispersion of various resins such as acrylic, vinyl acetate, ethylene / vinyl acetate, vinyl chloride, styrene / butadiene copolymer, natural rubber. Although various rubber latexes such as the above can be used, an acrylic resin aqueous dispersion is preferable especially in consideration of alkali resistance, weather resistance and durability. A preferred acrylic resin aqueous dispersion is prepared by polymerizing various monomers, but from the viewpoint of strength and elongation of the coating film of the resulting cement, the following (a) to (c) monomers are used. Combinations are preferred.

(A) Ethyl acrylate, n-propyl acrylate, n-butyl acrylate, isobutyl acrylate, 2-ethylhexyl acrylate, octyl acrylate, lauryl acrylate, tridecyl acrylate, hydroxyethyl acrylate, hydroxy acrylate Homopolymers such as propyl have a glass transition point of less than 0 ° C. alkyl acrylate; lauryl methacrylate
Homopolymers such as tridecyl methacrylate, which have a glass transition temperature of 0 ° C. or lower; methacrylic acid alkyl esters; ethylene, isobutylene, vinylidene chloride, butadiene, etc., which have a glass transition temperature of less than 0 ° C. Monomer 10-95% by weight

(B) Alkyl acrylates such as methyl acrylate, t-butyl acrylate, etc., whose homopolymer has a glass transition point of 0 ° C. or higher; methyl methacrylate,
Alkyl methacrylates such as ethyl methacrylate, propyl methacrylate, butyl methacrylate, hydroxyethyl methacrylate, etc., whose homopolymer has a glass transition point of 0 ° C. or higher; styrene, α-methylstyrene, vinyl chloride, vinyl acetate, Vinyl propionate, branched fatty acid vinyl (vinyl versatate), acrylonitrile,
0 to 90% by weight of other monomers such as methacrylonitrile, acrylamide and methacrylamide whose homopolymer has a glass transition point of 0 ° C or higher.

(C) Unsaturated carboxylic acids such as acrylic acid, methacrylic acid and itaconic acid, and anhydrides of unsaturated carboxylic acids such as maleic anhydride 0-0.7% by weight

(D) N-methylol acrylamide, N
-Methylol methacrylamide, N-phenylmaleimide, N- (methyl) phenylmaleimide, N- (hydroxy) phenylmaleimide, N- (methoxy) phenylmaleimide, N-benzoic acid maleimide, N-methylmaleimide, N-ethylmaleimide, Other monomers having a special functional group such as N-n-propylmaleimide, N-isopropylmaleimide, Nn-butylmaleimide, N-isobutylmaleimide and Nt-butylmaleimide.

0-20% by weight

In the present invention, one kind or two or more kinds of the above-mentioned monomers may be used in an appropriate combination, but in consideration of the physical properties of the cement composition after curing, the glass transition point of the polymer is -50. It is preferable to adjust the temperature to 50 ° C. If the glass transition temperature exceeds 50 ° C, the rigidity of the coating film increases, but it becomes difficult to form a film at room temperature, and the physical properties tend to deteriorate due to insufficient film formation, and the glass transition point is too high. If it is too low, the flexibility and extensibility are improved, but the coating film strength tends to be weak, which is not preferable. Further, it is possible to crosslink between the molecules with a polyfunctional compound according to the purpose of use.

The aqueous resin dispersion according to the present invention can be prepared from the above monomers or various monomer mixtures by various well-known methods such as suspension polymerization, emulsion polymerization and dispersion polymerization. Are preferably produced by emulsion polymerization. That is, (co) polymerization by adding an unsaturated monomer and various monomer mixtures into water containing an emulsifier or a protective colloid agent, and heating at 50 to 95 ° C. in the presence of a polymerization initiator such as potassium persulfate. To obtain a resin aqueous dispersion having a solid content of 40 to 60% by weight.

As the emulsifier, various kinds of anionic surfactants and nonionic surfactants such as sodium dialkyl sulfosuccinate, alkali salts of alkyl sulfonic acids, alkali metal salts of oxyalkylated alcohols or alkylphenols, alkali salts of fatty acids, etc. Can be used. The amount used is usually 0.1 to 5 with respect to the resin content.
% By weight. In addition, depending on the purpose, a cationic surfactant may be used alone or in combination with a nonionic surfactant.

Examples of the above-mentioned protective colloid include hydroxyethyl cellulose, polyethylene oxide / propylene oxide block polymer, and alkali soluble products of unsaturated carboxylic acid copolymers. The polymerization initiator used in emulsion polymerization is preferably an inorganic peroxide such as potassium persulfate, ammonium persulfate or hydrogen peroxide, but other azo initiators such as benzobisisobutyronitrile and azobisvaleronitrile; benzoylper Organic peroxide type initiators such as oxide, lauroyl peroxide and t-butyl peroxide can also be used. Further, reducing agents such as Rongalit, L-ascorbic acid and organic amines may be used in combination with these initiators as a redox initiator.

Various methods can be used as the method of supplying the monomers in the emulsion polymerization. For example, the batch charging method,
Various methods such as a monomer addition method and an emulsion addition method can be used. Further, a seed polymerization method or a power feed polymerization method in which the composition of the added monomer is sequentially changed can also be used.

The associative thickener as the component (C) in the present invention is an activator having a hydrophilic group having two or more hydrophobic end groups. The hydrophilic group acts on water, one hydrophobic end group is adsorbed on the particles, and the other hydrophobic end group is adsorbed on another particle or the hydrophobic end group to exert a thickening effect. Conceivable. Examples of the associative thickener include polyether-based, urethane-modified polyether-based, and polyether-modified acrylic-based, and urethane-modified polyether-based polyurethane thickeners are particularly preferable.

This polyurethane thickener usually has three or more hydrophobic groups, two or more of which are terminal groups, and these hydrophobic groups are linked through a hydrophilic polyether group. It is an activator characterized by having a group. These are Collacral PU
85 (manufactured by BASF Germany), ADEKA NOL UH-420,
UH-438 (Made by Asahi Denka Co., Ltd.), SN thickener
There are commercially available products such as 612 (manufactured by San Nopco). Further, its manufacturing method is described in JP-A-48-97783, JP-B-52-25840, JP-A-54-80349, JP-B-1-55292, and the like. The content of the component (C) is 0.
It is from 0 to 10% by weight, preferably from 0.03 to 6% by weight. If it is too small, the effect of improving the self-leveling property is small, and if it is too large, not only the viscosity becomes high and coating becomes difficult, but also the water resistance and the like. The deterioration of physical properties is remarkable.

2 in one molecule of the component (D) in the present invention
As the surfactant having one or more sulfonic acid groups, Perex SS-H, SS-L (manufactured by Kao Corporation), Dowfa
For example, an alkyl diphenyl ether disulfonate-based surfactant such as x2A-1 (manufactured by Dow Chemical Co., Ltd.), an alkali salt of a naphthalene sulfonic acid formalin condensate such as DEMOL N and Mighty 100 (manufactured by Kao) can be used.

As the cationic surfactant, quaternary ammonium salts such as lauryltrimethylammonium chloride and stearyltrimethylammonium chloride, alkylamine salts such as stearylamine hydrochloride and alkylbetaine type such as laurylbetaine are used. it can. Also, alkylamines such as polyoxyethylene alkylamine, which have the property as a weak cationic surfactant, can be used. It is preferred that these alkylamines have low molar adducts of ethylene oxide over high molar adducts. Although the above-mentioned surfactants can be used in the present invention, cationic surfactants are more effective and preferred, and quaternary ammonium salt type cationic surfactants are particularly preferred.

The content of the component (D) is 0.01 to 10% by weight, preferably 0.05 to 6% by weight. If it is too small, the initial viscosity will be too high and coating will be difficult, and if it is too large. Not only the physical properties such as water resistance are deteriorated, but also the self-leveling property is significantly deteriorated. It is used when the aqueous resin dispersion of component (B) is produced by emulsion polymerization using a surfactant or a cationic surfactant having two or more sulfonic acid groups in one molecule. These 1 that exist in
A surfactant or a cationic surfactant having two or more sulfonic acid groups in the molecule is also the component (D) of the present invention.

The ratio (C / D) of the components (C) and (D) in the present invention is 0.1 to 15, preferably 0.1 to 1.
When it is too small, the effect of improving the self-leveling property is small, and when it is too large, the viscosity becomes too high and coating becomes difficult.

As the aggregate of the component (E) which can be further contained in the present invention, silica sand, talc, mica, diatomaceous earth, gypsum dihydrate, amorphous silica, kaolin, quartz, iron powder,
Fly ash, ultra white, titanium oxide, calcium carbonate, asbestos powder, white carbon, zirconia,
Examples thereof include carbon black, perlite, zinc oxide, foamed resin particles, perlite particles, glass sphere particles and the like.

The amount of the aggregate used is 0 to 600 parts by weight, preferably 0 to 300 parts by weight, based on 100 parts by weight of cement. descend.

Water can be added to the cement composition of the present invention in consideration of its coating property, drying property, curability, etc., and the solid content in the system is 50 to 90% by weight. It is preferable to adjust so that Needless to say, it is not necessary to add further water when the concentration is such that it can be used with water from the resin aqueous dispersion of the component (B).

The cement composition of the present invention further contains a dispersant, a water-reducing agent, a retarder, a curing accelerator, a wetting agent, a defoaming agent, a solvent, a plasticizer, and a composition within a range that does not impair the performance of the resulting coating film. Various additives such as a film auxiliary agent, an antifreezing agent, and other thickening agents can also be blended.

The cement composition of the present invention comprises concrete, mortar, slate, asphalt, iron, aluminum,
To form a coating film with a thickness of several tens of microns to several cm by brushing, trowel coating, roller coating, spraying, etc. on fibers, glass, wood, cloth and plastics such as vinyl chloride and polyethylene. You can

[0027]

EXAMPLES Next, the present invention will be described in detail with reference to Examples and Comparative Examples. Parts and% in the examples are parts by weight and% by weight, unless otherwise specified. Aqueous Resin Dispersion Production Examples 1 to 3 L equipped with anchor type stirrer thermometer and reflux condenser
200 parts of water was charged into a four-necked round bottom flask and heated to 90 ° C., 300 parts of the unsaturated monomer mixture shown in Table 1, 3 parts of sodium dodecylbenzenesulfonate as an anionic surfactant, and nonion. As a surface active agent, a mixture of 1.5 parts of polyoxyethylene nonylphenyl ether, 2.5 parts of potassium persulfate and 100 parts of ion-exchanged water was emulsion polymerized at 90 ° C. for 4.5 hours to give a solid content concentration of 5
An aqueous resin dispersion with 0% and an average particle size of 0.3 micron was obtained. In addition, the glass transition point is measured by a differential scanning calorimeter (DSC)
(DuPont device name: DuPont 910).

[0028]

[Table 1]

Preparation of Cement Composition 1 100 parts of Portland cement was mixed with 100 parts of resin aqueous dispersion obtained in Production Example 1 of resin aqueous dispersion (solid content),
As the associative thickener for the component (C), 2.0 parts of a urethane-modified polyether polymer (Adekanol UH-438 (Asahi Denka Kogyo Co., Ltd., trade name: 30% active ingredient)), (D)
Sodium alkyldiphenyl ether disulfonate, which is a surfactant having two or more sulfonic acid groups in one molecule as a component (trade name Perex SS-H manufactured by Kao Corporation)
2.0 parts (active ingredient 50%), 100 parts silica sand and 1 part antifoaming agent were mixed to prepare a cement composition.

The viscosity of the obtained composition at the initial stage and after 1 hour was determined by measuring the viscosity at a rotor rotation speed of 6 rpm and 60 rpm using a B type viscometer (manufactured by Tokyo Keiki).
From this ratio (viscosity at 6 rpm / viscosity at 60 rpm), the TI value which is an index of self-leveling property was determined. The smaller the TI value, the better the self-leveling property. In addition, 200 g of the obtained composition was poured on a glass plate placed horizontally so as to have a uniform surface with a thickness of 2 mm.
After the lapse of 0 minutes, the surface was roughened front and back and to the left and right using a standard comb iron specified in JIS A 5548, and the recovery state of the surface was evaluated according to the following criteria to confirm the self-leveling property.

[0031] Table 2 shows the results. The weight (%) of the components (C) and (D) in the table is the weight (%) of each active ingredient.

Examples 2 to 22 and Comparative Examples 1 to 8 Type of aqueous resin dispersion, type and amount of associative thickener,
The types and amounts of component (D) and the amount of aggregate are shown in Tables 2 to 7
A cement composition was prepared in the same manner as in Example 1 except that the cement composition was changed as shown in, and evaluated in the same manner as in Example 1.

[0033]

[Table 2] (Note) A ^{* 1} : Urethane-modified polyether polymer (made by Asahi Denka Co., Ltd., trade name: ADEKANOL UH-438) B ^{* 2} : Sodium alkyldiphenyl ether disulfonate (Kao Corporation, trade name Perex SS-H)

[0034]

[Table 3]

[0035]

[Table 4] (Note) C ^{* 3} : Lauryl trimethyl ammonium chloride (trade name Kotamine 24P manufactured by Kao Corporation)

[0036]

[Table 5]

[0037]

[Table 6]

[0038]

[Table 7]

[0039]

The cement composition of the present invention is excellent in self-leveling property and workability.

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Claims (3)

[Claims] 1. Component (A): cement (B) component: aqueous resin dispersion (C) component: associative thickener (D) component: surface active agent having two or more sulfonic acid groups in one molecule. A composition containing an agent or a cationic surfactant, wherein the component (C) is 0.01 to 10% by weight, and the component (D) is 0.01 to 1 by weight.
A cement composition containing 0% by weight and a ratio (C / D) of the component (C) to the component (D) of 0.1 to 15. 2. A cement composition, wherein the composition further contains an aggregate as a component (E). 3. A cement composition, wherein the composition contains 1 to 300 parts by weight of the component (B) with respect to 100 parts by weight of the component (A).