JP4561115B2 - Polymer cement composition and concrete structure thereof - Google Patents

Description

  The present invention relates to a waterproof polymer cement composition that can be applied to a concrete structure or the like to obtain a cured product that imparts waterproof properties, and a concrete structure having a cured product layer of the polymer cement composition.

  In order to provide waterproof properties to rooftops, basements, and verandas of concrete structures, a polymer cement composition in which cement is blended with a resin emulsion or the like is applied.

  For example, Patent Document 1 discloses 30 to 98% by weight of one or more monomers selected from alkyl (meth) acrylates having an alkyl group having 4 to 10 carbon atoms, and 0.1 to 3 (meth) acrylic acid. A polymer having an essential constituent monomer of 0.1% by weight and glycidyl (meth) acrylate and having a glass transition temperature of −20 ° C. or lower is emulsified in water by a cationic or nonionic surfactant. There is disclosed a waterproof material composition comprising a dispersed emulsion and an inorganic hydraulic substance.

Patent Document 2 contains a polymer component, a cement, an aggregate, a water reducing agent, and a water retention agent. The polymer component has an anion having a glass transition temperature (Tg) of −5 ° C. or lower and exceeding −20 ° C. -It consists of a cationic amphoteric alkali curable acrylic-styrene synthetic resin emulsion, and the weight percentage (P / C) of the resin solid content of the emulsion with respect to cement is 30 to 80%. Silica fume fine particles as a component that causes a pozzolanic reaction ( A concrete waterproofing composition is disclosed, which contains SiO ₂ content of 90% or more and an average particle size of 0.1 to 0.2 μm) with respect to cement.

Patent Document 3 discloses that the following composition (1) is applied as a primer to the surface of a building, and then the following composition (2) is applied as a waterproof material to the coating surface. A waterproofing method for a surface is disclosed.
(1) A composition containing 1 to 50% by weight of an epoxy resin and 5 to 99% by weight of cement, based on the total solid content, and the total amount of which is 40% by weight or more.
(2) One or more monomers selected from alkyl (meth) acrylates having an alkyl group having 4 to 10 carbon atoms, (meth) acrylic acid and glycidyl (meth) acrylate as essential constituent monomers, and glass A composition comprising an emulsion in which a polymer having a transition point of −20 ° C. or lower is emulsified and dispersed in water by a surfactant, and an inorganic hydraulic substance.

Patent Document 4 discloses a waterproof construction method in which a primer material composed of the following (1) is applied on the surface of a building, and a waterproof material composed of the following (2) is applied on the surface of the coating film.
(1) A composition comprising a polymer emulsion containing a specific alkyl (meth) acrylate, methyl acrylate or ethyl acrylate and (meth) acrylic acid as essential constituent monomers, and an inorganic hydraulic substance.
(2) A specific alkyl (meth) acrylate, methyl (meth) acrylate and N-methylol (meth) acrylamide or N-alkoxymethyl (meth) acrylamide is an essential constituent monomer, and the Tg point is −20 ° C. or lower. A composition comprising an emulsion of a polymer and an inorganic hydraulic substance.

JP-A-7-268167 JP-A-11-116313 JP 7-317094 A Japanese Patent Laid-Open No. 7-292676

  Cement compositions containing polymers have been used for waterproofing concrete. When a cement composition containing a polymer is coated on a concrete structure and cured to form a waterproof layer, blistering may occur between the concrete and the waterproof layer of the cement composition. ing.

  The present invention relates to water resistance and workability in which a cement composition containing an emulsion-based polymer component and alumina cement is applied to a concrete structure, and blistering is improved between the concrete and the hardened layer of the cement composition. It is an object of the present invention to provide a polymer cement composition for forming a water-resistant layer of a polymer emulsion system that is excellent in water resistance.

  The first of the present invention is to provide a polymer cement composition comprising an alumina cement, an emulsion and a hardening accelerator.

2nd of this invention is the concrete structure which laminated | stacked the hardened | cured material layer of the polymer cement composition on the concrete layer,
It is to provide a concrete structure characterized in that the polymer cement composition is the polymer cement composition according to the first aspect of the present invention.

The third aspect of the present invention is a concrete structure in which a hardened material layer of a primer and a hardened material layer of a polymer cement composition are laminated in this order on a concrete layer,
The polymer cement composition is the polymer cement composition according to the first aspect of the present invention,
It is to provide a concrete structure characterized in that the primer is an emulsion.

The 1st, 2nd or 3rd preferable aspect of this invention is shown below.
The polymer cement composition preferably contains 3 to 175 parts by mass of alumina cement with respect to 100 parts by mass of the solid content of the emulsion.
It is preferable that a polymer cement composition contains 0.1-7 mass parts of hardening accelerators with respect to 100 mass parts of alumina cement.
The polymer cement composition preferably contains 3 to 175 parts by mass of alumina cement with respect to 100 parts by mass of the solid content of the emulsion, and 1 to 7 parts by mass of a hardening accelerator with respect to 100 parts by mass of the alumina cement.
In the polymer cement composition, the emulsion preferably contains an emulsion having a glass transition temperature of 0 ° C. or lower.
In the polymer cement composition, the emulsion preferably contains one or more emulsions having a glass transition temperature of 0 ° C. or lower selected from ethylene-vinyl acetate emulsions and acrylic emulsions.
The polymer cement composition further contains a filler, preferably 3 to 175 parts by mass of alumina cement and 20 to 350 parts by mass of the total amount of the alumina cement and filler with respect to 100 parts by mass of the solid content of the emulsion. .
The polymer cement composition is preferably for concrete waterproofing.
The polymer cement composition is preferably a waterproof polymer cement composition.
In the polymer cement composition, the pot life of the polymer cement composition is preferably 0.25 hours or more.
The curing accelerator preferably contains lithium carbonate.
The filler preferably contains silica sand and / or talc.

The polymer cement composition of the present invention is a composition with a short drying time after construction, and can suppress or eliminate the occurrence of blistering between the concrete structure to be constructed and the cured layer of the polymer cement composition. A structure with excellent aesthetics can be obtained.
The polymer cement composition of the present invention is not only excellent in workability but also provides a waterproof layer excellent in coating film characteristics. Therefore, the utility value is high in providing long-term waterproofing to a concrete structure.
Since the concrete structure of the present invention has the cured product layer of the polymer cement composition of the present invention on the surface, the concrete structure is excellent in aesthetics and excellent in waterproofness.

  The polymer cement composition of the present invention contains alumina cement, an emulsion and a hardening accelerator, and preferably further contains a filler.

In the polymer cement composition of the present invention,
By containing alumina cement preferably 3 to 175 parts by mass, more preferably 5 to 100 parts by mass, more preferably 10 to 85 parts by mass, and particularly preferably 20 to 60 parts by mass with respect to 100 parts by mass of the solid content of the emulsion. ,
(1) Promoting the drying of the composition by a hydration reaction, excellent in ensuring water resistance and strength of the cured coating film,
(2) When the content of alumina cement is less than the above range with respect to 100 parts by mass of the solid content of the emulsion, the drying time and strength of the coating film are insufficient, and when it is greater than the above range, the pot life is short, It is not preferable because the viscosity increases and the workability and workability may be hindered.
In the polymer cement composition of the present invention, the drying time of the coating film can be 1 to 4.75 hours, preferably 1.5 to 4.5, and more preferably 2 to 4.5 hours. Excellent.

  The polymer cement composition is preferably 0.1 to 7 parts by weight, more preferably 0.5 to 6 parts by weight, more preferably 0.8 to 5 parts by weight, based on 100 parts by weight of the alumina cement. The content of 3 to 5 parts by mass is particularly preferable in order to suppress the occurrence of blistering of the cured layer of the polymer cement composition on the concrete layer.

  The polymer cement composition is preferably 3 to 175 parts by mass of alumina cement, more preferably 5 to 100 parts by mass, more preferably 10 to 85 parts by mass, and particularly preferably 20 to 100 parts by mass with respect to 100 parts by mass of the solid content of the emulsion. 60 parts by mass, and 0.1 to 7 parts by mass, more preferably 0.5 to 6 parts by mass, more preferably more than 2 parts by mass and 5 parts by mass or less with respect to 100 parts by mass of alumina cement. In particular, 3 to 5 parts by mass is preferably included to ensure workability without increasing the viscosity of the polymer cement composition and to suppress the occurrence of swelling of the cured layer of the polymer cement composition on the concrete layer. Is preferable.

In the polymer cement composition of the present invention, the alumina cement and the filler are preferably 20 to 350 parts by weight, more preferably 30 to 300 parts by weight, and more preferably 50 to 250 parts by weight with respect to 100 parts by weight of the solid content of the emulsion. Part, particularly preferably 100 to 230 parts by weight.
When the ratio of the powder containing the alumina cement and the filler to the solid content of the emulsion is larger than the above range, the resulting polymer cement composition has a high viscosity and the workability is lowered. Substrate crack followability is not obtained, and this is not preferable. If it is smaller than the above range, sufficient base crack followability can be obtained, but this is not preferable because the coating film strength is lowered and the tackiness of the coating film is increased.

In the present invention, the emulsion is a synthetic resin emulsion, a polyvinyl acetate emulsion, an ethylene-vinyl acetate emulsion obtained by copolymerizing ethylene and vinyl acetate; a copolymer of ethylene, vinyl acetate and a (meth) acrylic acid derivative. (Meth) acrylic acid derivatives such as coalescence emulsion, copolymer emulsion of ethylene and (meth) acrylic acid derivative, emulsion of poly (meth) acrylic acid derivative, copolymer emulsion of styrene and (meth) acrylic acid derivative A synthetic resin emulsion containing at least one kind of acrylic resin emulsion containing polychloroprene latex, copolymer emulsion of vinyl acetate and vinyl chloride, copolymer emulsion of styrene and butadiene, copolymer emulsion of acrylonitrile and butadiene, etc. for Can be. The (meth) acrylic acid derivative means acid derivatives such as acrylic acid, methacrylic acid, and esters thereof.
Emulsions include resin-based emulsions developed for architectural applications such as ethylene-vinyl acetate emulsions and acrylic resin emulsions, and polymer components developed for architectural applications such as ethylene-vinyl acetate emulsions and acrylic resin emulsions. A resin emulsion having a glass transition temperature of 0 ° C. or lower can be preferably used.
Any glass transition temperature can be used for the polymer component contained in the emulsion, but it is preferably 0 ° C. or lower, more preferably −45 to 0 ° C., and more preferably −45 to −5 ° C. If there is no particular limitation, it can be used.
The emulsion contains an emulsion having a glass transition temperature of the polymer component of 0 ° C. or less, more preferably an emulsion containing 50% by weight or more of the polymer component having a glass transition temperature of 0 ° C. or less, particularly preferably a glass transition of the polymer component. It is preferable to use an emulsion containing 80% by weight or more of one having a temperature of 0 ° C. or lower.
The emulsion preferably includes an emulsion selected from an ethylene-vinyl acetate emulsion having a glass transition temperature of 0 ° C. or lower and an acrylic emulsion having a glass transition temperature of 0 ° C. or lower.
The solid content of the emulsion is the mass of a solid material mainly composed of a polymer component after removing a solvent such as water.

In the case of using an ethylene-vinyl acetate emulsion or an ethylene-vinyl acetate emulsion having a glass transition temperature of 0 ° C. or lower in the emulsion, the emulsion preferably contains 50% by mass or more of an ethylene-vinyl acetate emulsion, more preferably ethylene. -It is preferable to use an emulsion containing 60% by mass or more of a vinyl acetate emulsion, particularly preferably an emulsion containing 70% by mass or more of an ethylene-vinyl acetate emulsion.
When an acrylic resin emulsion or an acrylic resin emulsion having a glass transition temperature of 0 ° C. or lower is used in the emulsion, the emulsion preferably contains 5% by mass or more of the acrylic resin emulsion, more preferably 10% by mass of the acrylic resin emulsion. %, Particularly preferably an emulsion containing 20% by mass or more of an acrylic resin emulsion.
In particular, an emulsion including an ethylene-vinyl acetate emulsion and an acrylic resin emulsion, or an ethylene-vinyl acetate emulsion having a glass transition temperature of 0 ° C. or less and an acrylic resin emulsion having a glass transition temperature of 0 ° C. or less. In the case of using an emulsion containing 50 wt% or more of an ethylene-vinyl acetate emulsion and 50 wt% or less of an acrylic resin emulsion, more preferably 60 wt% or more of an ethylene-vinyl acetate emulsion and an acrylic resin. It is preferable to use an emulsion containing 40% by mass or less of an emulsion, particularly preferably an emulsion containing 70% by mass or more of an ethylene-vinyl acetate emulsion and 30% by mass or less of an acrylic resin emulsion.

  As the emulsion, one obtained by a known production method can be used. For example, by using a polymerization initiator in the presence of an emulsifier, a polymerizable monomer that is a raw material for a synthetic resin is emulsion-polymerized in water or a hydrous solvent. It can manufacture by the method to do.

As the emulsifier, known ones can be used, and examples thereof include anionic, nonionic, cationic or amphoteric surfactants and protective colloids such as polyvinyl alcohol.
As the polymerization initiator, those capable of radical polymerization in water or a hydrous solvent are preferable, and examples thereof include hydrogen peroxide, peracetic acid, persulfuric acid, water-soluble peroxides such as ammonium salts and sulfates thereof, and salts thereof. be able to. Further, organic peroxides such as benzoyl peroxide, t-butyl hydroperoxide, 2,2′-azobisisobutylnitrile, and reducing agents such as sodium metasulfite and sodium pyrosulfite can be used in combination.
The amount of the polymerization initiator used can be appropriately selected as long as the emulsion can be produced.

  The emulsion contains powdery synthetic resin particles that do not contain water or a water-containing solvent. When powdery synthetic resin particles are used, all components excluding water or the water-containing solvent can be made into one package, and the construction site Then, it can be used simply by adding water.

  In an emulsion containing water or a water-containing solvent excluding powdered synthetic resin not containing water or a water-containing solvent, the solid content of the polymer contained in the emulsion can be appropriately selected. Is preferably 30 to 80 parts by mass, more preferably 40 to 60 parts by mass in 100 parts by mass of the emulsion. If it is less than 30 parts by mass, it may be difficult to cure. If it exceeds 80 parts by mass, the viscosity may be too high and workability may be reduced, or a coating film may not be formed uniformly.

As the ethylene-vinyl acetate copolymer emulsion, a known emulsion obtained by copolymerizing ethylene and vinyl acetate can be used.
As the ethylene vinyl acetate copolymer emulsion, a product using a water-soluble polymer such as polyvinyl alcohol or cellulose derivative as an emulsifier or protective colloid can be preferably used. In particular, the ethylene vinyl acetate copolymer emulsion is preferably one using polyvinyl alcohol as a protective colloid.
In the polymer component of the ethylene-vinyl acetate copolymer emulsion, the vinyl acetate content is preferably 30 to 90% by mass, more preferably 50 to 90% by mass, and particularly preferably 60 to 86% by mass.
The content of the ethylene vinyl acetate copolymer component in the ethylene vinyl acetate copolymer emulsion is preferably 40 to 65% by mass, more preferably 45 to 60% by mass, and particularly preferably 47 to 60% by mass.

As the acrylic resin emulsion, one or more (meth) acrylate compounds such as alkyl (meth) acrylate such as methyl (meth) acrylate, ethyl (meth) acrylate, butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, or the like Those obtained by polymerizing two or more kinds, and those obtained by copolymerization with vinyl compounds such as styrene, vinyl acetate and vinylidene chloride which can be copolymerized with these monomers can be used. (Meth) acrylate means methacrylate and acrylate.
The acrylic resin emulsion is preferable because the polymer component contained in the emulsion is excellent in elongation by using a polymer that is not crosslinked, more preferably a polymer that is not crosslinked within or between polymers.
For the acrylic resin emulsion, known emulsifiers and protective colloids can be used. For example, water-soluble polymers such as polyvinyl alcohol and cellulose derivatives, emulsifiers and protective colloids such as nonionic surfactants and ionic surfactants can be used. Can be used.
As the acrylic resin emulsion, a known emulsion can be used, and the content of the acrylic resin component is not particularly limited.

The polymer cement composition of the present invention can contain a wax suspension in addition to the emulsion.
As the wax suspension, a known wax suspension such as a water dispersion type such as a paraffin wax suspension, an olefin wax suspension, and a Fischer-Tropsch wax suspension can be used.
As the paraffin wax suspension, a suspension of paraffin wax mainly composed of n-paraffin can be used.
As the olefin wax suspension, a suspension of low and medium molecular weight polyolefin such as polyethylene wax and polypropylene wax can be used.

Alumina cement has a potentially rapid hardening property, and gives a cured product excellent in chemical resistance and fire resistance after curing. Alumina cement is commercially available is known several those mineral composition is different, but both major component is monocalcium aluminate (CA), from the viewpoint of strength and coloring, CA component number and C ₄ Alumina cement with a small amount of small components such as AF is preferred.
In the polymer cement composition of the present invention, it is preferable to use alumina cement alone as the cement component. In addition to alumina cement, it contains hydraulic components such as Portland cement, gypsum and blast furnace slag as long as the characteristics of the present invention are not impaired. But you can.

The filler can be used by adding silica sand, slag powder, fly ash, limestone powder, talc, kaolin, alumina powder, titanium oxide, aluminum hydroxide, mica, pyrophyllite, etc. Two or more species can be used. In particular, in the case of silica sand, use of No. 5 to 7 is preferable in terms of surface accuracy.
The polymer cement composition of the present invention preferably contains talc as a filler, and further preferably contains talc and silica sand.
The polymer cement composition of the present invention is preferably 0.1 to 40 parts by weight, more preferably 1 to 35 parts by weight, more preferably 5 to 30 parts by weight of talc as a filler with respect to 100 parts by weight of the solid content of the emulsion. Parts, particularly preferably 15 to 25 parts by mass, and further preferably 0.1 to 40 parts by mass of talc and 17 to 300 parts by mass of silica sand.

Curing accelerators are known lithium salts such as lithium carbonate, lithium chloride, lithium sulfate, lithium nitrate, lithium hydroxide, lithium acetate, lithium tartrate, lithium malate, lithium citrate, and other organic and inorganic lithium. A salt can be used. As the curing accelerator, it is particularly preferable to contain lithium carbonate or use lithium carbonate from the viewpoint of the suppression effect of blistering, availability, and cost.
The lithium salt preferably has a lithium salt particle size of 50 μm or less, more preferably 30 μm or less, and particularly preferably 10 μm or less because it has excellent solubility and does not impair the appearance of the surface due to many fine spots.

The polymer cement composition of the present invention can contain additives in order to adjust the setting time and fluidity, or within a range not impairing the characteristics of the present invention.
Examples of the additive include commonly used setting retarders such as setting retarders and setting accelerators other than the curing accelerator used in the present invention, water reducing agents, fluidizers, antifoaming agents, thickeners, and the like. I can do it.

  The waterproof polymer cement composition of the present invention can contain glass fibers for the purpose of improving the strength of the coating film.

The waterproof polymer cement composition of the present invention preferably contains an antifoaming agent for the purpose of improving the strength and waterproofness of the coating film.
As the antifoaming agent, known materials such as synthetic materials such as silicon-based, alcohol-based, polyether, and fluorine-based materials or plant-derived natural materials can be used.
The defoaming agent can be added within a range that does not impair the properties of the present invention. The total amount of solids of alumina cement and emulsion and solids such as talc and silica sand added as necessary. 2 parts by mass or less, particularly 0.2 parts by mass or less is preferable with respect to 100 parts by mass. When the defoaming agent is added in a larger amount than the above, the defoaming effect may not be improved.

The polymer cement composition of the present invention comprises:
(1) A concrete structure can be obtained by laminating a cured layer of a polymer cement composition on a concrete layer. Moreover, the hardened | cured material layer of a polymer cement composition can be directly or laminated | stacked on a concrete layer.
In the polymer cement composition of the present invention, a concrete structure can be obtained by providing a hardened material layer of a primer on a concrete layer and further laminating the hardened material layer of the polymer cement composition in this order. Moreover, the hardened | cured material layer of a primer can be directly provided in a concrete layer, and also the hardened | cured material layer of a polymer cement composition can be directly laminated | stacked on the hardened | cured material layer of a primer.

When showing an example of the construction of the concrete structure of the present invention,
(1) After placing concrete or mortar on the roof, floor or wall and finishing it with a trowel, machine, etc., the concrete or mortar is cured to form a concrete layer. (2) On the cured product layer surface of the primer The concrete structure can be applied by applying the polymer cement composition of the present invention by a general method using a roller, a trowel, a spray, and the like, and then forming a cured product layer obtained by curing the polymer cement composition. it can.

When showing an example of construction having a cured product layer of the primer of the concrete structure of the present invention,
(1) After placing concrete or mortar on the roof, floor or wall and finishing it with a trowel, machine, etc., the concrete or mortar is cured to form a concrete layer. (2) Primer ( Emulsion diluted solution or diluted aqueous solution) is applied or sprayed by a general method using a roller, a trowel and a spray, and then a cured product layer is formed by curing the primer,
(3) Applying the polymer cement composition of the present invention to the surface of the cured product layer of the primer by a general method using a roller, a trowel and a spray, and then forming a cured product layer obtained by curing the polymer cement composition. Thus, a concrete structure can be constructed.

As the primer cured product layer, known primers such as ethylene-vinyl acetate copolymer emulsions and acrylic resin emulsions can be used, and a layer made of a cured product of these emulsions is preferred.
The cured product layer of the primer uses the same resin component as the emulsion contained in the polymer cement composition of the present invention or uses the same resin component as the emulsion used in the polymer cement composition of the present invention. It is preferable because the adhesive strength between the layers with the polymer cement composition of the invention is excellent.

  The polymer cement composition of the present invention can be used for waterproofing applications such as concrete waterproofing, concrete floor waterproofing, concrete rooftop waterproofing, and the like, and a concrete structure coated on the surface of concrete work can be obtained.

The polymer cement composition of the present invention measures a predetermined amount of an emulsion in a stirring vessel, and while stirring the emulsion with a stirrer, a predetermined amount of a hardening accelerator such as alumina cement or lithium carbonate, and further, if necessary, a filler or an additive Etc., and can be adjusted by stirring and mixing for several minutes. In that case, it is preferable not to add water from the viewpoint of material separation and film property deterioration.
A hardening accelerator such as alumina cement and lithium carbonate, a filler or an additive may be added alone, or may be added in advance mixed with other several kinds, and the order of addition is not particularly limited. . Moreover, what has a stirring function, such as a general solid-liquid stirrer, can be used for a stirrer without a problem.

  The polymer cement composition and the primer of the present invention are applied by a method such as application to the surface of an object by a general method using a brush, a roller, a trowel and a spray. It is preferable that the applied layer of the polymer cement composition repeats the same operation after drying and curing to form a plurality of cured layers. In addition, when constructing a structure in which the mesh is sandwiched between hardened materials by construction on the rooftop, place the mesh on the polymer cement composition after drying, and fix the mesh by constructing the polymer cement composition from above the mesh It is possible to adopt a method of adding a process to perform. Furthermore, it is also possible to finish by forming a protective layer in which another composition or material is applied and dried on the outermost layer.

  In the polymer cement composition of the present invention, the pot life of 20 ° C. is preferably 0.25 hours or more, more preferably 0.35 hours or more, and particularly preferably 0.5 hours or more in order to ensure working time. preferable.

  The polymer cement composition of the present invention has a slurry viscosity of preferably 5 to 100 Pa · s, more preferably 10 to 75 Pa · s, and particularly preferably 10 to 50 Pa · s, in order to prevent sagging and to ensure the workability of the iron. preferable.

  Hereinafter, the present invention will be described in more detail based on examples. However, the present invention is not limited by the following examples.

Evaluation of physical properties of the coating film is performed as follows.
(1) Slurry viscosity measurement method: At 20 ° C., room temperature, each component shown in Table 1 and its blending ratio are weighed into a container, and after stirring, a polymer cement composition is prepared. Immediately manufactured by Tokimec Co., Ltd. With a DVH-BII viscometer, the rotor No. 6 is used to measure the viscosity under the condition of a rotation speed of 20 rpm.
(2) Evaluation method of pot life at 20 ° C .: After preparing the polymer cement composition shown in Table 1 at 20 ° C., use a slate plate (the same emulsion as in each example and comparative example, When the solution (primer) added and diluted 10 times is applied to the surface of the slate in an amount of 0.4 kg / m ² and left for 1 day, the polymer cement composition does not extend well with the iron. Measure the elapsed time until.
(3) Evaluation method of the amount of blistering at 60 ° C .: After preparing the polymer cement composition shown in Table 1 at room temperature of 20 ° C., a 300 × 300 × 4 mm slate plate (the same emulsion as each example and comparative example) A solution (primer) diluted 10-fold by adding water to the emulsion was applied to the slate surface in an amount of 0.4 kg / m ² and allowed to stand for 1 day, then left in a 60 ° C. dryer for 1 hour before evaluation. 0.9 kg / m ² , and immediately put in a drier at 60 ° C. After 10 minutes, 20 minutes and 30 minutes, the amount of blistering on the coating film surface is visually observed.

(4) Glass transition temperature: An appropriate amount of emulsion was dropped on a glass plate, dried at 60 ° C. for 16 hours, and the resulting dried coating film having a mass in the range of 9.5 to 10.5 mg was subjected to differential scanning calorimetry. The glass transition temperature is measured using a meter (manufactured by Shimadzu Corporation, DSC-50).
The DSC measurement conditions were as follows: room temperature was raised from 150 ° C. over 10 minutes, held at 150 ° C. for 10 minutes, lowered to a temperature 50 ° C. lower than the Tg of the sample obtained by calculation, and again raised to 150 ° C. over 10 minutes When warming, the first Tg is measured. Next, when the temperature is lowered to 50 ° C. lower than the Tg measured in the first time, the second Tg is measured, and the second Tg value is defined as the glass transition temperature.

Examples 1 to 4 and Comparative Example 1
(1) The following materials are used as raw materials.
Emulsion A: ethylene-vinyl acetate copolymer emulsion (manufactured by Denki Kagaku Kogyo Co., Ltd., trade name: EVA # 59, using polyvinyl alcohol as a protective colloid, solid content in emulsion A: 56% by weight, emulsion Content of vinyl acetate polymer component in A: 41% by weight, glass transition temperature: −15 ° C.).
Emulsion B: Acrylic polymer emulsion (manufactured by High Pressure Gas Industry Co., Ltd., trade name: Pegar 842, solid content in emulsion B: 54% by weight, glass transition temperature: −15 ° C.).
Alumina cement: Commercially available alumina cement (type 3 according to JIS R-2511).
Silica sand: Commercially available No. 6 silica sand.
-Talc: Made by Nippon Talc, Trade name: Talc S.
-Lithium carbonate (commercially available) (particle size: 10 μm or less used).

(2) Preparation of polymer cement composition Emulsion, alumina cement, silica sand, and lithium carbonate were added to a 2 L plastic container at a blending ratio shown in Table 1 (total 1250 g), and a 0.15 KW stirrer was used at 1300 rpm. The mixture was mixed for 3 minutes to obtain a slurry polymer cement composition.
The obtained polymer cement composition was evaluated for viscosity, pot life and amount of blistering of the coating film, and the results are shown in Table 2.
The blending ratios in Table 1 indicate the weight of the solid content of the emulsion.

Claims (9)

Cement component consisting of only alumina cement, saw including emulsions and lithium carbonate, polymer cement composition emulsion characterized by containing Mukoto acrylic emulsion.   The polymer cement composition according to claim 1, comprising 3 to 175 parts by mass of alumina cement with respect to 100 parts by mass of the solid content of the emulsion. The polymer cement composition according to claim 1 or 2, comprising 0.1 to 7 parts by mass of lithium carbonate with respect to 100 parts by mass of the alumina cement. The polymer cement composition further includes a filler,
The solid content 100 parts by weight of the emulsion, the polymer cement composition according to any one of claims 1 to 3, characterized in that it comprises a total amount from 20 to 350 parts by weight of alumina cement and the filler. The polymer cement composition according to any one of claims 1 to 4 , wherein the emulsion comprises an emulsion having a glass transition temperature of 0 ° C or lower. Emulsion polymer cement composition according to any one of claims 1 to 5, characterized in that glass transition temperature containing 0 ℃ following acrylic emulsion. The polymer cement composition according to any one of claims 1 to 6 , wherein the polymer cement composition is used for waterproofing concrete. A concrete structure in which a hardened layer of a polymer cement composition is laminated on a concrete layer,
A concrete structure, wherein the polymer cement composition is the polymer cement composition according to any one of claims 1 to 7 . A concrete structure in which a hardened material layer of a primer and a hardened material layer of a polymer cement composition are laminated in this order on a concrete layer,
The polymer cement composition is the polymer cement composition according to any one of claims 1 to 7 ,
A concrete structure characterized in that the primer is an emulsion.