JPH0891900A - Cementitious base material admixture, composition containing the same, and casting method and bonding method using the composition - Google Patents

Abstract

(57) [Summary] [Purpose] To provide an admixture for a cementitious base material which can improve the adhesiveness to an inorganic base material by being added to a cementitious base material such as mortar or cement paste. [Structure] An admixture for a cementitious base material comprising an emulsion containing a polymer having a silyl group represented by the following general formula (I). [Chemical 1] (In the formula, R is a monovalent hydrocarbon group selected from an alkyl group having 1 to 10 carbon atoms, an aryl group and an aralkyl group, X is a halogen atom, an alkoxy group, a hydroxy group, an acyloxy group, an aminoxy group, a phenoxy group, A group selected from a thioalkoxy group and an amino group, y is an integer of 0 to 2, Si
When there are two or more X and R bound to each, they may be the same or different groups. )

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to an admixture used for cementitious base materials such as mortar and cement paste, which can also be used as a primer for piecing, and a composition containing the admixture, and the composition. Regarding a casting method and an adhesion method using a material, specifically, an admixture for a cementitious base material capable of improving adhesiveness to an inorganic base material such as concrete and stone, and a composition containing the admixture, and The present invention relates to a casting method and a bonding method using a composition.

[0002]

2. Description of the Related Art Conventionally, when painting or repairing the surface of an inorganic base material such as concrete or stone, or when adhering a tile or the like to the surface of the inorganic base material, , Cementitious base materials such as mortar and cement paste are used.

Such cementitious base materials have watertightness,
It is required to have excellent properties such as resistance to neutralization, freeze-thaw resistance, chemical resistance, impact resistance, bending strength, compressive strength, or adhesiveness to the inorganic base material. For the purpose of improving such properties, an aqueous polymer dispersion such as styrene-butadiene rubber latex, polyacrylic ester emulsion, ethylene vinyl acetate emulsion, etc. has been added to the cementitious base material.

Although the addition of the aqueous polymer dispersion has certainly improved the water-tightness, the resistance to neutralization, the freeze-thaw resistance, and the like, the flexural strength, the compression strength, and the inorganic base material The fact is that the adhesiveness has not been sufficiently improved. In this situation,
Development of an additive (admixture) capable of simultaneously improving bending strength, compressive strength, and adhesiveness to an inorganic substrate has been awaited.

[0005]

In view of the above-mentioned conventional techniques, the present inventors have improved bending strength and compression strength after curing (solidification), and have improved adhesiveness with inorganic base materials such as concrete and stone. As a result of intensive studies to obtain an admixture for a cementitious base material that can improve the properties, when an emulsion containing a silyl group-containing polymer represented by the general formula (I) is used as an admixture, such physical properties are They have found that they can be significantly improved, and have arrived at the present invention.

[0006]

Means and Actions for Solving the Problems The admixture for cementitious base material of the present invention (hereinafter, also referred to as "admixture") has a silyl group represented by the general formula (I) as described above. It is an emulsion containing a polymer.

[0007]

[Chemical 2] (In the formula, R is a monovalent hydrocarbon group selected from an alkyl group having 1 to 10 carbon atoms, an aryl group and an aralkyl group, X is a halogen atom, an alkoxy group, a hydroxy group, an acyloxy group, an aminoxy group, a phenoxy group, A group selected from a thioalkoxy group and an amino group, y is an integer of 0 to 2, Si
When there are two or more X and R bound to each, they may be the same or different groups. ).

In the present invention, the cementitious base material means an uncured material such as mortar or cement paste.

The substrate of the polymer having a silyl group represented by the general formula (I) is not particularly limited, and examples thereof include epoxy resin, polyester resin, polyether resin, acrylic resin and fluororesin. In particular, acrylic resin is preferable in terms of weather resistance, chemical resistance, wide resin design range, and cost.

The method for producing the above-mentioned resin (polymer) having a silyl group represented by the general formula (I) is not particularly limited, and a known method can be used. In particular, the vinyl-based resin having a silyl group is used. A method of emulsion-polymerizing a monomer (hereinafter, referred to as "silyl group-containing vinyl-based monomer") with another copolymerizable vinyl-based monomer is easy and preferable.

The silyl group-containing vinyl monomer represented by the general formula (I) is not limited, but specific examples include:

[Chemical 3]

[Chemical 4] And so on.

These silyl group-containing vinyl monomers are
One kind may be used alone, or two or more kinds may be used in combination. In particular, it is preferable to use an alkoxysilyl group-containing compound from the viewpoint of easy handling, cost, and reaction by-product. As the alkoxysilyl group, a methoxysilyl group is inexpensive, and an ethoxysilyl group is preferable in terms of stability.

There is no limitation on other vinyl monomers copolymerizable with the silyl group-containing vinyl monomer, and examples thereof include methyl (meth) acrylate, ethyl (meth) acrylate,
(Meth) acrylate-based monomers such as butyl (meth) acrylate, isobutyl (meth) acrylate, benzyl (meth) acrylate, cyclohexyl (meth) acrylate; trifluoroethyl (meth) acrylate,
Pentafluoropropyl (meth) acrylate, perfluorocyclohexyl (meth) acrylate, 2,2
3,3-tetrafluoropropyl methacrylate, β-
Fluorine-containing vinyl monomers such as (perfluorooctyl) ethyl (meth) acrylate; aromatic hydrocarbon vinyl monomers such as styrene, α-methylstyrene, chlorostyrene, 4-hydroxystyrene, vinyltoluene; acryl Polymerization of α, β-ethylenically unsaturated carboxylic acids such as acids, methacrylic acid, maleic acid, maleic anhydride, itaconic acid, itaconic anhydride, crotonic acid, fumaric acid, citraconic acid, styrene sulfonic acid, vinyl sulfonic acid, etc. Acids having possible carbon-carbon double bonds, or salts thereof (alkali metal salts, ammonium salts, amine salts, etc.); acid anhydrides such as maleic anhydride, or those and straight or branched chains having 1 to 20 carbon atoms. Alcohols and half esters; dimethylaminoethyl (meth) acrylate, dimethylamino Propyl (meth) acrylate,
(Meth) acrylate having an amino group such as diethylaminoethyl (meth) acrylate; (meth) acrylamide, α-ethyl (meth) acrylamide, N-butoxymethyl (meth) acrylamide, N, N-dimethylacrylamide, N-methylacrylamide , Acryloylmorpholine or their hydrochloric acid or acetate; vinyl esters or allyl compounds such as vinyl acetate, vinyl propionate, diallyl phthalate; nitrile group-containing vinyl monomers such as (meth) acrylonitrile; glycidyl (meth) acrylate, etc. An epoxy group-containing vinyl monomer of 2-hydroxyethyl (meth) acrylate,
2-hydroxypropyl (meth) acrylate, 2-hydroxyethyl vinyl ether, N-methylol (meth) acrylamide, hydroxystyrene, Aronix 5700 (manufactured by Toagosei Kagaku Co., Ltd.), PlaccelF
A-1, PlaccelFA-4, PlaccelFM
-1, Placcel FM-4 (above, Daicel Chemical Industries Ltd.), HE-10, HE-20, HP-10, H
P-20 (above, Nippon Shokubai Chemical Co., Ltd.), Blemmer PP series, Blemmer PEP series, Blemmer AP-400, Blemmer NKH-5050, Blemmer GLM (above, NOF Corporation), hydroxyl group-containing vinyl type. Hydroxy group-containing vinyl monomers such as modified hydroxyalkyl vinyl monomers; hydroxyalkyl esters of α, β-ethylenically unsaturated carboxylic acids such as hydroxyalkyl esters of (meth) acrylic acid and phosphoric acid or phosphoric acid ester Vinyl compounds such as condensation products with vinyl compounds or vinyl compounds such as (meth) acrylates containing urethane bond or siloxane bond; AS-6, AN-6, which are macromonomers manufactured by Toa Gosei Kagaku KK
Compounds such as AA-6, AB-6 and AK-5, vinyl methyl ether, vinyl chloride, vinylidene chloride, chloroprene, propylene, butadiene, N-vinyl imidazole, other vinyl monomers such as vinyl sulfonic acid,
Polymerization type light stabilizers such as LA87, LA82 and LA22 manufactured by Asahi Denka Co., Ltd., polymerization type ultraviolet absorbers and the like can be mentioned.

By using the fluorine-containing vinyl-based monomer and the siloxane-containing vinyl-based monomer, water resistance and durability are improved. Further, the stability of the emulsion will be improved by using a hydrophilic monomer such as (meth) acrylic acid, dimethylaminoethyl maleate (meth) arylate, (meth) acrylamide, a hydroxyl group-containing vinyl monomer or polypropylene glycol methacrylate. improves. In particular, Bremmer PE-90, PE-200, PE-35
0, PME-100, PME-200, PME-40
0, AE-350 (manufactured by NOF CORPORATION), MA-30,
MA-50, MA-100, MA-150, RA-11
20, RA-2614, RMA-564, RMA-56
No. 8, RMA-1114, MPG130-MA (manufactured by Nippon Emulsifier Co., Ltd.), a hydrophilic vinyl monomer having a polyoxyethylene chain is used without impairing the stability of the silyl group and mechanically stabilizing the emulsion. And water resistance can be improved.

The amount of the hydrophilic vinyl-based monomer having a polyoxyethylene chain used is 0.1 to 10 when all the monomers are 100 parts by weight (hereinafter simply referred to as "part").
Parts are preferred. If it is less than 0.1 part, mechanical stability tends to be low, and if it exceeds 10 parts, water resistance is lowered.

In addition to this, by using a monomer having a polymerizable unsaturated bond such as polyethylene glycol dimethacrylate, ethylene glycol diacrylate and triallyl cyanurate, the polymer produced has a crosslinked structure. It is also possible to make something.

The silyl group-containing vinyl monomer and the other vinyl monomer copolymerizable with the silyl group-containing vinyl monomer are used in a proportion of 1 relative to the total amount of the silyl group-containing vinyl monomer. It is preferable to use -30 parts, and further 2-20
Partial use is preferred. When the amount of the silyl group-containing vinyl-based monomer is less than 1 part, the water resistance and weather resistance tend to be poor, and when it exceeds 30 parts, the stability of the emulsion tends to decrease.

Next, the production of an emulsion polymer obtained by emulsion-polymerizing the above-mentioned vinyl monomer containing a silyl group and another vinyl monomer copolymerizable therewith will be described.

As the emulsion polymerization method, various emulsion polymerization methods such as a batch polymerization method, a monomer dropping polymerization method, and an emulsion monomer dropping polymerization method can be appropriately selected and adopted, and in particular, stability during production is ensured. For this purpose, the monomer dropping polymerization method and the emulsion monomer dropping polymerization method are suitable.

As the surfactant which can be used in the above-mentioned production method,
There is no particular limitation as long as it is used in ordinary emulsion polymerization, and examples thereof include ionic or nonionic surfactants.

Examples of the ionic surfactant include sulfonates such as sodium lauryl sulfonate, sodium dodecylbenzene sulfonate and sodium isooctylbenzene sulfonate; ammonium salts such as imidazoline laurate and ammonium hydroxide. .

The silyl group is stabilized by using an anionic surfactant having a polyoxyethylene chain. As a specific example, Newcol560SN, New
col560SF (all manufactured by Nippon Emulsifier Co., Ltd.), Emal NC-35, Revere WZ (all manufactured by Kao Corporation)
Polyoxyethylene nonyl phenyl ether sulphates such as; Newcol 707SF, Newcol 7
07SN, Newcol723SF, Newcol74
Polyoxyethylene allyl ether sulphate such as 0SF; Octylphenoxyethoxyethyl sulphonate such as Newcol 861SE; Newcol 1
Examples include polyoxyethylene tridecyl ether sulfate (such as 305SN, manufactured by Nippon Emulsifier Co., Ltd.).

As the nonionic surfactant, polyoxyethylenes such as polyoxyethylene nonylphenyl ether and polyoxyethylene lauryl ether;
L-77, L-720, L-5410, L-7602,
Representative examples include nonionic surfactants containing silicon such as L-7607 (above, manufactured by Union Carbide Co.).

The use of a reactive surfactant having a polymerizable double bond in the molecule as the surfactant does not interfere with the present invention. In particular, when a reactive surfactant having a polymerizable double bond in the molecule and having a polyoxyethylene group is used, the water resistance is improved. As a specific example, ADEKA SOAP NE-10, NE-20, NE-30, NE
-40, SE-10N (all manufactured by Asahi Denka Kogyo Co., Ltd.),
Antox-MS-60 (manufactured by Nippon Emulsifier Co., Ltd.), Aqualon RN-20, RN-30, RN-50, HS-1.
0, HS-20, HS-1025 (all manufactured by Dai-ichi Kogyo Seiyaku Co., Ltd.).

These surfactants may be used alone or in combination of two or more.

In order to carry out the polymerization more stably, a temperature of 70 ° C. or lower, preferably 40 to 6 using a redox catalyst.
It is preferable to proceed the reaction at a temperature of 5 ° C.

As the redox catalyst, potassium persulfate, ammonium persulfate and acidic sodium sulfite,
Rongalit combination, hydrogen peroxide and ascorbic acid combination, t-butyl hydroperoxide,
A combination of an organic peroxide such as benzoyl peroxide, cumene hydroperoxide and p-menthane hydroperoxide with acidic sodium sulfite, Rongalit and the like is used. In particular, a combination of an organic peroxide and a reducing agent is preferable from the viewpoint of stable polymerization. In addition, a compound containing a divalent iron ion such as iron sulfate and a chelating agent such as disodium ethylenediaminetetraacetate may be appropriately added in order to stably obtain the catalytic activity.

The proportion of such redox catalyst (initiator) used is 0.01 to 0.01, based on the weight of the monomer.
10% is preferable, and 0.05-5% is more preferable.

The solid content concentration in the emulsion used in the method of the present invention is preferably 20 to 70%, and 3
0 to 60% is more preferable.

When the above-mentioned solid content concentration exceeds 70%, the viscosity of the system remarkably increases and it is difficult to remove the heat generated by the polymerization, and it takes a long time to take it out from the polymerization machine. Cause Further, when the solid content concentration is less than 20%, no problem occurs in terms of polymerization operation, but the amount of resin produced by one polymerization operation is small, which is extremely disadvantageous from the economical point of view.

The emulsion containing the polymer synthesized by the above method serves as the admixture for cementitious base material in the present invention. Further, the composition of the present invention can be obtained by the admixture and the cementitious base material.

The cementitious base material used in the present invention is, for example, those exemplified above, and the cement used in the cementitious base material such as mortar and cement paste is not particularly limited. Various types of Portland cement such as high-strength Portland cement, ultra-high-strength Portland cement, moderate heat Portland cement, sulfate resistant Portland cement, white iron Portland cement; blast furnace cement,
Examples thereof include silica cement, fly ash cement, alumina cement, solidit, calcium silicate, and other cements; mixed cements obtained by combining two or more of these cements; and cements obtained by mixing these cements with an inorganic substance such as gypsum.

Further, water is usually used for the mortar and cement paste, and the mortar may contain normal sand, fine aggregate and the like. The effect of improving the adhesiveness exhibited by the admixture of the present invention hardly changes even when the cementitious base material contains a reinforcing fibrous material or coarse aggregate.

As the mortar, for example, a mixture of 100 parts of cement with about 100 to 400 parts of fine aggregate and about 50 to 300 parts of water is preferably used. As the cement paste, for example, cement is used. A mixture of about 20 to 200 parts of water with respect to 100 parts is preferably used.

The blending ratio of the admixture for cementitious base material and the cementitious base material in the composition of the present invention varies depending on the use of the composition to be obtained and therefore cannot be unconditionally determined. If the compounding ratio of the agent is too small, it tends to be less likely to improve the adhesiveness of the resulting composition to the inorganic base material. If it is more than 5 parts, preferably more than 5 parts, and it is also in a large amount, it is uneconomical and the compressive strength of the composition after curing tends to decrease, so the cement in the cementitious base material It is 30 parts or less, preferably 20 parts or less with respect to 100 parts.

In addition to the above-mentioned admixture and cementitious base material, a curing agent may be added to the composition of the present invention in order to accelerate the crosslinking reaction of the admixture.

As a curing agent, an organometallic compound, an acid catalyst,
A basic catalyst is used. In particular, an organic aluminum compound or an organic tin compound is preferable in terms of curing activity,
For example, organobutyl compounds such as dibutyltin dilaurate, dibutyltin dimaleate, dibutyltin diacetate, dibutyltin dimethoxide, tributyltin sulfite, dibutyltin thioglycolate, tin octylate; aluminum isopropylate, aluminum tris (ethyl acetate), aluminum tris. (Acetylacetonate), organic aluminum compounds such as ethyl acetate aluminum diisopropylate, and the like.

These organometallic compounds are excellent in curing activity and storage stability when they are emulsified in advance by using a surfactant mainly composed of an alkyl ether type and added at the time of use. The amount of the organic metal compound used is preferably about 0.1 to 5 parts based on 100 parts of the solid content of the silyl group-containing emulsion.

Further, the composition of the present invention may be used in various types of concrete, such as an antifoaming agent, an air entraining agent, a water reducing agent, a fluidizing agent, a quick-setting agent, a shrinkage reducing agent, etc. Chemicals such as additives can be appropriately mixed.

Further, a commercially available aqueous polymer dispersion such as styrene-butadiene rubber latex, polyacrylic acid ester emulsion, ethylene vinyl acetate emulsion and the like can be appropriately blended in the composition of the present invention.

The method of preparing the composition of the present invention is not particularly limited. For example, cement or water, and if necessary, sand, fine aggregate or the like is kneaded to prepare a cementitious base material, and then the cementitious material is prepared. There are a method of adding an admixture before the base material is cured and further stirring, and a method of simultaneously kneading the admixture with cement, water, sand, fine aggregate and the like.

The composition thus obtained can be cured and hardened by a method similar to that for ordinary cement compositions, but the composition of the present invention can be used at low or high temperatures, in steam or in water. It is also possible to cure under the conditions of.

Since the composition of the present invention contains an admixture for cementitious base materials, the composition of the present invention has extremely high fluidity as compared with a composition containing no such admixture. Since the increase in the viscosity of the kneaded product is small even in the summer, there is an advantage that workability in, for example, a casting method or an adhesive method, which will be described later, is remarkably improved, and in particular, trowel separation is improved.

The casting method of the present invention is characterized in that the composition is cast on an inorganic substrate.

Examples of the inorganic base material include, for example, slate formed from the cementitious base material, concrete such as ALC and PC, and ceramics, stone materials, and the like.
Examples include bricks and flat stones, but the present invention is not limited to these examples.

In the casting method of the present invention, for the purpose of paving, repairing, waterproofing, etc., for example, the composition is appropriately coated on the surface or defective portion of the inorganic base material, and then the composition is appropriately cured and cured. Not only the method, but also a method of splicing the inorganic base materials together by appropriately encapsulating the composition in a gap formed in the inorganic base material and then appropriately curing and curing the composition is included.

The amount of the composition used when the composition is cast on the inorganic substrate is not particularly limited, and may be adjusted as appropriate according to the application.

The bonding method of the present invention is characterized in that the inorganic base material and the adherend are bonded via the composition.

Examples of the inorganic base material include those exemplified as the base material used in the driving method.

Examples of the material to be adhered include tiles, stones, iron materials and the like, and building civil engineering materials for coating the surface of the inorganic base material for the purpose of decoration and reinforcement, but the present invention is only such an example. It is not limited to.

The bonding method of the present invention includes, for example, a method in which the composition is appropriately coated on the surface of an inorganic base material, an adhesive material is loaded on the composition, and then the composition is appropriately cured and cured. Can be mentioned.

The amount of the composition used when adhering the inorganic substrate and the adherend through the composition is not particularly limited, and may be appropriately adjusted so that the two are sufficiently adhered. .

As described above, in the casting method and the bonding method of the present invention, since the above-mentioned composition exhibiting extremely excellent adhesiveness is used, the driving method of the present invention can be applied to the outer wall of a factory, a warehouse, or the like. The present invention can be suitably used for paving the floor surface of a car yard, stairs, etc., repair work, waterproofing work of wall surfaces of, for example, water tanks, pools, buildings, etc. The bonding method of can be suitably used, for example, for interior work of a building such as bonding of tiles, soundproofing work of iron girders, lining of cast iron pipes, and the like.

Further, the admixture of the present invention or the mixture of the admixture and the curing agent can be used as a primer for transfer, as in the case of the polyacrylic ester emulsion and the ethylene vinyl acetate emulsion. The splicing primer is also called a sealer or an adhesion enhancer, and is used in a construction method in which it is directly applied to an inorganic base material and a cementitious base material is placed thereon.

Since the admixture of the present invention has a reactive silyl group, it has a strong adhesive force with an inorganic base material and excellent durability, and is suitable as a primer for transfer coating.

[0056]

EXAMPLES Hereinafter, the admixture for cementitious base material of the present invention, the composition containing the same, and the construction method and bonding method using the composition will be described based on Examples. The present invention is not limited to this.

Synthesis Examples 1 and 2 A reactor equipped with a stirrer, a reflux condenser, a nitrogen gas introducing pipe and a dropping funnel was initially charged with 40 parts of deionized water, 0.35 part of Rongalit, and [Table 1]. 0.9 parts of the surfactant shown, 1.0 part of polyoxyethylene nonylphenyl ether, 0.5 part of ammonium acetate, 0.2 part of t-butyl hydroperoxide, and a monomer emulsion 158 having the composition shown in [Table 1]. 20 parts of the set were prepared.

Next, while introducing nitrogen gas, the temperature was raised to 50 ° C., and after heating for 1 hour, 3 parts of a mixture of 0.5 part of t-butyl hydroperoxide and the remaining 138 parts of the monomer emulsion was added. It dripped over time.

After that, polymerization was carried out for 1 hour, and the solid content concentration was adjusted to 45% with deionized water.

Thus, Emulsion 1 (corresponding to Synthesis Example 1) and Emulsion 2 (corresponding to Synthesis Example 2) as the admixture for cementitious base material of the present invention were obtained.

[0061]

[Table 1]

Example 1 Normal Portland cement / Toyoura standard sand / emulsion 1 / water = 100/300/22/54 (weight ratio) was mixed to obtain a cementitious base material composition.

This composition was packed in a mold of 1 × 1 × 5 cm, then demolded at 23 ° C. and a humidity of 80% or more for 48 hours, and then cured in water at 23 ° C. for 5 days, and further 23
It was stored for 21 days at 50 ° C and 50% humidity. The cured product (solidified product) thus obtained was used as a test piece for a bending strength test and a compression strength test.

The strength test (bending strength test and compression strength test) was carried out according to JIS A 1172 (polymer cement mortar strength test method). However, J
Since a test piece (1 × 1 × 5 cm) smaller than the IS standard test piece (4 × 4 × 16 cm) was used, the fulcrum distance in the bending strength test was set to 3 cm, and the bending strength was calculated as follows. Bending strength = 3FL / 2WT ² = 3 × F × 3/2 × 1 × 1
² = F × 4.5 (F: load, L: distance between fulcrums, W: width of test piece, T: thickness of test piece).

The width of the indenter in the compressive strength test was 1 cm, and the compressive strength was calculated as follows. Compressive strength = F / A × W = F / 1 × 1 = F (F: load, A: width of indenter, W: width of test piece).

Example 2 Ordinary Portland cement / Toyoura standard sand / emulsion 1 / water = 100/300/22/54 were mixed in a ratio of
Further, 0.36 part of an emulsion of dibutyltin dilaurate (solid content concentration 15%) was added and then kneaded to obtain a cementitious base material composition. This composition was subjected to a strength test in the same manner as in Example 1.

Example 3 A strength test was conducted in the same manner as in Example 1 except that Emulsion 2 was used instead of Emulsion 1.

Example 4 A strength test was conducted in the same manner as in Example 2 except that Emulsion 2 was used instead of Emulsion 1.

Comparative Example 1 Normal Portland cement / Toyoura standard sand / water = 100 /
Kneading was carried out at a ratio of 300/87. This kneaded product was subjected to a strength test in the same manner as in Example 1.

Comparative Example 2 Ordinary Portland Cement / Toyoura Standard Sand / Acrylic Emulsion (Emulsion of polymer containing no silyl group. Trade name: Celpact, manufactured by Daicel Chemical Industries, Ltd.)
/ Water was kneaded at a ratio of 100/300/22/54.
This kneaded product was subjected to a strength test in the same manner as in Example 1.

Comparative Example 3 Ordinary Portland cement / Toyoura standard sand / SBR latex (polymer emulsion containing no silyl group. Trade name: Celtal, manufactured by Daicel Chemical Industries, Ltd.) / Water = 1
Kneading was carried out at a ratio of 00/300/22/54. This kneaded product was subjected to a strength test in the same manner as in Example 1.

Comparative Example 4 Ordinary Portland cement / Toyoura standard sand / EVA emulsion (polymer emulsion containing no silyl group.
Product name: Sermity, manufactured by Daicel Chemical Industries, Ltd./
Water was kneaded at a ratio of 100/300/22/39. This kneaded product was subjected to a strength test in the same manner as in Example 1.

The respective results are shown in [Table 2].

[0074]

[Table 2]

Example 2 and Example 4 with addition of curing agent
In comparison, the bending strength and the compressive strength showed the maximum values as compared with the comparative example.

Example 5 Ordinary Portland cement / Toyoura standard sand / emulsion 2 / water = 100/300/22/54
A cementitious base material composition was obtained.

This composition was packed in a 4 × 4 × 1 cm mold made on a 7 × 7 × 2 cm mortar board, that is, cast on the mortar board, and then at 23 ° C. and 80% humidity.
After demolding after 48 hours, it was cured in water at 23 ° C. for 5 days and further stored at 23 ° C. and 50% humidity for 20 days.

SU for adhesion testing on the surface of the cured composition
After the jig made by S was adhered with an epoxy adhesive, it was allowed to stand for 1 day and subjected to a strength test.

The strength test (adhesion strength test and breaking strength test) was performed according to JIS A 6915 (cement thickening spray material) 4.6.

Example 6 Ordinary Portland cement / Toyoura standard sand / emulsion 2 / water = 100/300/22/54 were mixed together,
Further, 0.36 part of an emulsion of dibutyltin dilaurate (solid content concentration 15%) was added and then kneaded to obtain a cementitious base material composition. This composition was subjected to a strength test in the same manner as in Example 5.

Comparative Example 5 Ordinary Portland Cement / Toyoura Standard Sand / Water = 100 /
Kneading was carried out at a ratio of 300/87. This kneaded product was subjected to a strength test in the same manner as in Example 5.

The respective results are also shown in [Table 3].

[0083]

[Table 3]

The adherends of both Examples 5 and 6 were destroyed, and showed sufficient adhesive strength as compared with the plain mortar of Comparative Example 5.

Example 7 The above emulsion 2 was placed on a mortar plate having a size of 7 × 7 × 2 cm.
Was diluted 3 times with water and applied with a brush, and after leaving it for one day and night, it was used as a mortar plate for an adhesive strength test.

On this mortar board, plain mortar (normal Portland cement / Toyoura standard sand / water = 100/3
00/87) was cast and an adhesive strength test was conducted in the same manner as in Example 5.

As a result, the adhesive strength was 15 kgf / cm ^2.
And cohesive failure (breakage inside the composition).

[0088]

The admixture for cementitious base material of the present invention remarkably improves the adhesiveness (adhesive strength) between the cementitious base material such as mortar and cement paste and the inorganic base material such as concrete and stone. be able to. That is, the composition containing the cementitious base material admixture and the cementitious base material exhibits an effect of exhibiting extremely excellent adhesiveness (adhesive strength) as compared with conventional cement compositions.

Further, the bending strength and compressive strength after curing of the composition containing the cementitious base material are greatly enhanced as compared with those of the conventional cement composition, and the durability becomes excellent. Bending strength and compressive strength are further improved by adding a curing agent.

As described above, by using the admixture for cementitious base material of the present invention, a cured product having excellent bending strength, compressive strength and adhesive strength can be obtained.

Therefore, the casting method and the bonding method of the present invention using the above composition are suitable for various construction civil works such as pavement of buildings, repair work, interior and exterior work, waterproof work, soundproof work, etc. The effect that can be adopted in.

Continuation of front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display area // C08L 71/02 LQC

Claims (9)

[Claims] 1. An admixture for a cementitious base material, comprising an emulsion containing a polymer having a silyl group represented by the following general formula (I). [Chemical 1] (In the formula, R is a monovalent hydrocarbon group selected from an alkyl group having 1 to 10 carbon atoms, an aryl group and an aralkyl group, X is a halogen atom, an alkoxy group, a hydroxy group, an acyloxy group, an aminoxy group, a phenoxy group, A group selected from a thioalkoxy group and an amino group, y is an integer of 0 to 2, Si
When there are two or more X and R bound to each, they may be the same or different groups. ) 2. The emulsion is copolymerizable with 1 to 30 parts by weight of a vinyl monomer having an alkoxysilyl group, 0.1 to 10 parts by weight of a hydrophilic vinyl monomer having a polyoxyethylene chain, and copolymerizable. A polymer obtained by emulsion-polymerizing a vinyl-based monomer mixture containing 100 parts by weight of another vinyl-based monomer by using an anionic surfactant having a polyoxyethylene chain. The admixture for a cementitious base material according to claim 1, which is an emulsion containing the admixture. 3. A cementitious base material composition comprising (A) a cementitious base material, and (B) the emulsion according to claim 1 or 2. 4. A cementitious base material composition comprising the composition according to claim 3 and a curing agent (C). 5. A casting method, wherein the composition according to claim 3 or 4 is cast on an inorganic base material. 6. A bonding method characterized in that an inorganic material and an adherend are bonded via the composition according to claim 3 or 4. 7. The bonding method according to claim 6, wherein the adherend material is a building civil engineering material. 8. A placing method, wherein the emulsion according to claim 1 or 2 is applied to an inorganic base material and a cementitious base material is placed thereon. 9. A placing method, which comprises applying the mixture of the emulsion according to claim 1 or 2 and a curing agent to an inorganic base material, and then placing a cementitious base material thereon.