JP7442367B2 - Raw material set for polymer cement composition, polymer cement composition and manufacturing method thereof, and cured polymer cement product - Google Patents

Description

The present invention relates to a raw material set for a polymer cement composition, a polymer cement composition and a method for producing the same, and a cured polymer cement product.

Conventionally, when adding waterproofness to the rooftops, basements, balconies, open hallways, exterior walls, etc. of concrete structures, polymer cement, which is a mixture of cement and resin emulsion, was used. In some cases, a colored paint containing a resin emulsion and pigments is applied to the surface of the waterproof layer. For example, Patent Document 1 discloses an aqueous coating material (polymer cement composition A method for manufacturing a product) is disclosed.

Special table 2019-501236 publication

However, in the aqueous coating material described in DE 10 2004 200 200 2, the use of an alkali metal hydroxide, in particular sodium hydroxide or potassium hydroxide, is described as an activator. However, these alkali metal hydroxides are designated as deleterious substances, and various restrictions are imposed on their production, transportation, sales, use, etc. Additionally, if it comes into contact with alkali metal hydroxides, there is a risk of chemical injury, so safety during work is a concern.

Therefore, the present invention does not use any deleterious substances as an activator, has excellent safety during work, and can ensure a sufficient pot life after mixing the raw materials. The main object of the present invention is to provide a polymer cement composition in which the substrate crack followability and elongation performance of the cured product are comparable to or better than those using an alkali metal hydroxide.

The inventors of the present invention have made extensive studies to solve the above problems, and have found that the above problems can be solved by using a predetermined first raw material and a predetermined second raw material, and have completed the present invention. .

One aspect of the present invention relates to a raw material set for polymer cement compositions. The raw material set for the polymer cement composition includes a first raw material containing a hydraulic component containing alumina cement, a resin emulsion, a set retarder, and a set accelerator, and a second raw material containing a basic aqueous solution containing an amine compound. Consists of raw materials. By using such a raw material set for polymer cement compositions, it is possible to have excellent safety during work, ensure a sufficient pot life after mixing the raw materials, and also ensure a long pot life when the cured product is formed. It becomes possible to produce a polymer cement composition that has excellent substrate crack followability and elongation performance.

Preferred embodiments of the raw material set for polymer cement compositions are shown below. In one aspect of the present invention, a plurality of these may be combined.
(1) The resin emulsion is a copolymer emulsion of ethylene and vinyl acetate or an acrylic copolymer emulsion. (2) The setting accelerator contains a formate. (3) The first raw material is a fine bone containing more material

Another aspect of the invention relates to polymer cement compositions. The polymer cement composition contains the first raw material and second raw material of the above-mentioned raw material set for a polymer cement composition, and includes a hydraulic component containing alumina cement, a resin emulsion, a setting retarder, and a hydraulic component containing alumina cement. , a setting accelerator, and a basic aqueous solution containing an amine compound. According to such a polymer cement composition, it is possible to have excellent safety during work, to ensure a sufficient pot life after mixing the raw materials, and to prevent cracks in the base of the cured product when it is formed. Excellent elasticity and elongation performance. Furthermore, since such a polymer cement composition does not generate dust during mixing, it does not require a dust mask and can be constructed in a better working environment than in the past.

Another aspect of the invention relates to a method of making a polymer cement composition. The method for producing the polymer cement composition includes the steps of preparing a first raw material containing a hydraulic component containing alumina cement, a resin emulsion, a set retarder, and a set accelerator, and adding an amine compound to the first raw material. and a step of adding a second raw material made of a basic aqueous solution containing and mixing the first raw material and the second raw material.

Another aspect of the present invention relates to a cured polymer cement body. The cured polymer cement contains a cured product of the above-mentioned polymer cement composition. The cured polymer cement product contains a cured product of a polymer cement composition that has excellent base crack followability and elongation performance, so it can have excellent waterproof performance.

According to the present invention, no deleterious substances are used as the activator, excellent safety during work is achieved, and a sufficient pot life can be ensured after mixing raw materials. Provided is a polymer cement composition in which the cured product exhibits substrate crack followability and elongation performance comparable to or higher than when an alkali metal hydroxide is used. Further, according to the present invention, a raw material set for manufacturing such a polymer cement composition is provided. Further, according to the present invention, a method for manufacturing such a polymer cement composition is provided. Furthermore, according to the present invention, a cured polymer cement body containing a cured body of such a polymer cement composition is provided.

EMBODIMENT OF THE INVENTION Hereinafter, the form for implementing this invention is demonstrated in detail. However, the present invention is not limited to the following embodiments.

[Raw material set for polymer cement composition]
A raw material set for a polymer cement composition according to one embodiment is suitably used for manufacturing a polymer cement composition, and is composed of a first raw material and a second raw material. The polymer cement composition can be produced, for example, by adding a second raw material to a first raw material and mixing the first raw material and the second raw material.

<First raw material>
The first raw material contains a hydraulic component, a resin emulsion (liquid in which resin is dispersed in water), a setting retarder, and a setting accelerator. The first raw material may be a component that gradually hardens due to the reaction between the hydraulic component and at least the water in the resin emulsion.

(hydraulic component)
The hydraulic component includes alumina cement. From the viewpoint of rapid hardening, aesthetic appearance due to efflorescence suppressing effect, and corrosion resistance, the content of Al ₂ O ₃ in the hydraulic component is preferably 20% to 90%, more preferably 40% to 80%, and even more preferably 55%. % to 75%.

Several types of alumina cement with different mineral compositions are known and commercially available, but the main component in all of them is monocalcium aluminate (CA), and any commercially available product can be used regardless of its type. Any alumina cement having a particle size that does not interfere with the present invention may be used, and commercially available alumina cement can be used. For example, it is preferable to use an alumina cement having a particle size of about 1 μm to 90 μm as the main component. For example, the alumina cement has a particle size of about 1 to 90 μm, based on the total amount of alumina cement, preferably 80% to 100% by mass, more preferably 90% to 100% by mass, and even more preferably 95% by mass. % to 100% by mass is preferably used. Alumina cement may be used alone or in combination of two or more.

(resin emulsion)
As the resin emulsion, a known resin emulsion can be used. The resin emulsion may be a synthetic resin emulsion. Examples of synthetic resin emulsions include polyethylene emulsions, polypropylene emulsions, polyvinyl acetate emulsions, copolymer emulsions of ethylene and vinyl acetate, copolymer emulsions of ethylene, vinyl acetate, and (meth)acrylic acid derivatives, and copolymer emulsions of ethylene and (meth)acrylic acid derivatives. ) Copolymer emulsions with acrylic acid derivatives, emulsions with poly(meth)acrylic acid derivatives, copolymer emulsions with styrene and (meth)acrylic acid derivatives, polychloroprene latex, copolymers with vinyl acetate and vinyl chloride Ethylene, styrene, vinyl acetate, (meth)acrylic acid derivatives such as emulsions, copolymer emulsions of styrene and butadiene, copolymer emulsions of acrylonitrile and butadiene, emulsions of vinyl acetate and (meth)acrylic acid derivatives, etc. An emulsion of a synthetic resin containing at least one type of can be used. (Meth)acrylic acid derivatives refer to acid derivatives such as acrylic acid and/or methacrylic acid, and esters thereof, and contain at least one type of these components. These may be used alone or in combination of two or more. The resin emulsion is preferably an ethylene and vinyl acetate copolymer emulsion or an acrylic copolymer emulsion, more preferably an acrylic copolymer emulsion. In particular, by using an acrylic copolymer emulsion as the resin emulsion, the resulting polymer cement composition tends to have excellent base crack followability and elongation performance in low-temperature environments (for example, around 0°C), and It is possible to form a cured product (coating film) that can be easily applied even in a low-temperature environment and has excellent waterproof properties.

The glass transition temperature of the resin component contained in the resin emulsion is not particularly limited, but from the viewpoint of base crack followability and elongation performance, it is preferably -45°C to 0°C, more preferably -40°C to - A temperature of 5°C, more preferably -35°C to -10°C can be suitably used.

The content of the solid content (resin content) of the resin emulsion is preferably 50 parts by mass to 550 parts by mass, more preferably 75 parts by mass, based on 100 parts by mass of the hydraulic component, from the viewpoint of base crack followability and elongation performance. parts to 450 parts by weight, more preferably 100 parts to 350 parts by weight.

(setting retarder)
The setting retarder is a component for delaying the hydration reaction of the hydraulic component. Examples of the setting retarder include phosphoric acid; phosphorous acid; hypophosphorous acid; pyrophosphoric acid; and salts thereof. Among these, the set retarder preferably contains phosphoric acid or a phosphate salt. Examples of the phosphate include sodium phosphate, potassium phosphate, ammonium phosphate, calcium phosphate, aluminum biphosphate, and magnesium biphosphate. By using phosphoric acid or a phosphate salt as a setting retarder, the progress of the hydration reaction tends to be suppressed over a long period of time. The set retarder more preferably includes phosphoric acid.

The content of the setting retarder is preferably 0.1 parts by mass to 10 parts by mass based on 100 parts by mass of the hydraulic component, from the viewpoint of stable suppression of the progress of hydration reaction, ability to follow cracks in the substrate, and elongation performance. parts, more preferably 0.5 parts to 7 parts by weight, still more preferably 1 parts to 5 parts by weight.

(setting accelerator)
The setting accelerator is a component for promoting the hydration reaction of the hydraulic component. Set accelerators are used as set modifiers, usually in combination with the set retarders mentioned above. Examples of the setting accelerator include acetate, formate, and the like. Among these, it is preferable that the setting accelerator contains a formate. Usually, a setting accelerator is used to accelerate the hydration reaction of hydraulic components, but by using a setting accelerator containing a formate, or a setting accelerator containing a setting retarder and a formate. By using it in combination with an agent, it is possible to ensure a more sufficient pot life after mixing the raw materials, and when the cured product is formed, the cured product can have better substrate crack followability and elongation performance. The reason why such an effect occurs is not necessarily clear, but the present inventors have found that by including formate as a setting accelerator, cement particles can be mildly stimulated without impairing the effectiveness of the setting retarder. As a result, we believe that we can secure a sufficient pot life. In addition, by including formate as a setting accelerator, the initial stage of the hydration reaction of cement starts slowly, and as a result, the properties of the resin are less likely to be impaired, and the properties are superior in terms of ability to follow cracks in the base and elongation performance. We believe that a cured product can be obtained.

Examples of the formate include lithium formate, potassium formate, sodium formate, and calcium formate. Among these, calcium formate is preferred because it can ensure a more sufficient pot life.

From the viewpoint of pot life, the content of the setting accelerator is preferably 0.1 parts by mass to 10 parts by mass, more preferably 0.4 parts by mass to 7 parts by mass, based on 100 parts by mass of the hydraulic component. More preferably, it is 0.7 parts by mass to 5 parts by mass.

(fine aggregate)
The first raw material may further contain fine aggregate. Examples of the fine aggregate include sands such as silica sand, river sand, sea sand, mountain sand, and crushed sand. These can be used alone or in combination of two or more.

From the viewpoint of workability during construction, the content of the fine aggregate is preferably 50 parts by mass to 400 parts by mass, more preferably 75 parts by mass to 350 parts by mass, and even more preferably is 100 parts by mass to 300 parts by mass.

(dispersant)
The first raw material may further contain a dispersant. As the dispersant, commercially available products having a water-reducing effect such as a formaldehyde condensate of melamine sulfonic acid, casein, calcium caseinate, polyether, and polycarboxylic acid can be used regardless of the type. These may be used alone or in combination of two or more. Among these, the dispersant is preferably polyether or polycarboxylic acid.

The content of the dispersant is preferably 0.01 parts by mass to 10 parts by mass, more preferably 0 parts by mass, based on 100 parts by mass of the hydraulic component, from the viewpoint of stable dispersion of inorganic component particles, water reduction effect, and economic efficiency. The amount is from .05 parts by weight to 7 parts by weight, more preferably from 0.1 parts by weight to 4 parts by weight.

(Thickener)
The first raw material may further contain a thickener. Examples of the thickener include cellulose-based, protein-based, latex-based, modified acrylic-based, water-soluble polymer-based thickeners, and modified starch-based thickeners such as xanthan gum, starch ether, and guar gum. These may be used alone or in combination of two or more. Among these, the thickener is preferably a cellulose-based or modified acrylic-based thickener.

From the viewpoint of stable dispersion of inorganic component particles, workability during construction, and economic efficiency, the content of the thickener is preferably 0.01 parts by mass to 5 parts by mass, based on 100 parts by mass of the hydraulic component. The amount is more preferably 0.03 parts by mass to 3 parts by mass, and even more preferably 0.05 parts by mass to 2 parts by mass.

(water)
The first raw material may further contain water in addition to the water in the resin emulsion. The content of water (the total amount including water in the resin emulsion) is preferably 15 parts by mass to 600 parts by mass, more preferably 50 parts by mass to 500 parts by mass, and even more preferably 100 parts by mass, based on 100 parts by mass of the hydraulic component. Parts by weight to 400 parts by weight, particularly preferably 150 parts to 300 parts by weight.

(Inorganic fine powder)
The first raw material may contain inorganic fine powder instead of or in addition to the fine aggregate. Examples of the inorganic fine powder include slag powder, fly ash, limestone powder, talc, kaolin, alumina powder, aluminum hydroxide, titanium oxide, zinc oxide, and carbon black. These may be used alone or in combination of two or more.

<Second raw material>
The second raw material is a basic aqueous solution containing an amine compound. When the basic aqueous solution contains an amine compound, it tends to be superior in terms of pot life, elongation performance, and safety. By adding the second raw material to the first raw material and mixing them, the hydration reaction of the resulting polymer cement composition can be started.

Examples of the amine compound include, but are not limited to, ethylamine, diethylamine, triethylamine, methylamine, methanolamine, 2-amino-2-methyl-1-propanol, and the like.

The concentration of the amine compound in the basic aqueous solution is preferably 40% by mass or more, more preferably 60% by mass or more, and even more preferably 80% by mass or more, from the viewpoint of forming a dense structure and economical efficiency. The upper limit of the concentration of the amine compound in the basic aqueous solution may be, for example, 99% by mass or less or 95% by mass or less.

From the viewpoint of forming a dense structure and economical efficiency, the ratio of the first raw material to the second raw material (basic aqueous solution) is determined based on the hydraulic component of the first raw material being 100 parts by mass. The proportion of the raw material (basic aqueous solution) is preferably 1 to 50 parts by weight, more preferably 3 parts to 30 parts by weight, and still more preferably 5 parts to 20 parts by weight.

[Polymer cement composition]
The polymer cement composition of one embodiment contains a hydraulic component including an alumina cement, a resin emulsion, a set retarder, a set accelerator, and a basic aqueous solution including an amine compound. The polymer cement composition can become a hardened product by proceeding with a hydration reaction and/or by drying. According to such a polymer cement composition, it is possible to have excellent safety during work, to ensure a sufficient pot life after mixing the raw materials, and to prevent cracks in the base of the cured product when it is formed. It has excellent elasticity and elongation performance.

The polymer cement composition contains the first raw material and the second raw material of the above-mentioned raw material set for polymer cement composition. Therefore, the materials, contents, etc. used in the polymer cement composition are the same as those of the first raw material and the second raw material of the above-mentioned raw material set for polymer cement composition. Therefore, redundant explanation will be omitted here.

The viscosity of the polymer cement composition can be adjusted as appropriate by the construction tool used during construction, the amount of application, etc. The viscosity when applying the polymer cement composition using a roller, for example, is preferably 3000 to 40000 mPa·s, more preferably 4000 to 30000 mPa·s, and still more preferably from the viewpoint of workability and shape retention of the cured product. It is 5000 to 20000 mPa·s. In addition, in this specification, the viscosity of a polymer cement composition means the viscosity measured by the method described in an Example.

[Method for producing polymer cement composition]
A method for producing a polymer cement composition according to one embodiment includes a step of preparing a first raw material (hereinafter sometimes referred to as "first step"), and adding a second raw material to the first raw material. , a step of mixing a first raw material and a second raw material (hereinafter sometimes referred to as "second step").

<First step>
In this step, a first raw material is prepared. The first raw material is, for example, a hydraulic component containing alumina cement, a resin emulsion, a setting retarder, a setting accelerator, and other components added as necessary, which are added to a container, and the mixture is mixed using a hand mixer or the like. It can be prepared by mixing using a blender. The first raw material may further contain water in addition to the water in the resin emulsion. The order in which each component is added to the container is not particularly limited and can be arbitrarily adjusted depending on the properties of each component. The prepared first raw material may be divided into subdivided containers as appropriate.

<Second process>
In this step, the second raw material is added to the first raw material, and the first raw material and the second raw material are mixed. The method of adding the second raw material to the first raw material is not particularly limited as long as the second raw material can be added to the first raw material, and any method can be adopted. The method of mixing the first raw material and the second raw material is not particularly limited as long as the first raw material and the second raw material can be mixed, and any method can be adopted. Examples of the method of mixing the first raw material and the second raw material include a method of mixing using a mixer such as a hand mixer.

[Polymer cement hardened body]
A cured polymer cement product of one embodiment contains a cured product of the above-described polymer cement composition.

The polymer cement composition is used by applying it to the surface of a workpiece in a conventional manner. The cured polymer cement product can be obtained by forming a cured product of the polymer cement composition by proceeding with a hydration reaction and/or drying the applied polymer cement composition. The drying time of the polymer cement composition varies depending on the temperature and the amount of application, but for example, when the amount of application is 1 kg/m ² at 23° C., it is preferably 0.3 to 3.0 hours, more preferably 0.5 hours. The time period is 4 to 2.5 hours, more preferably 0.5 to 2.0 hours. When the drying time of the polymer cement composition is within this range, it is possible to quickly proceed to the next step after coating while ensuring a good working time.

The cured product of polymer cement has multiple layers of cured polymer cement composition obtained by repeating the above-mentioned operations in order to reduce variations in the thickness of the cured product (coating film) depending on the installer or the location of construction. is preferred. In addition, when constructing rooftops of buildings, walls of structures, etc., when forming a structure in which a mesh of nonwoven fabric, woven fabric, etc. is sandwiched between the cured products of the polymer cement composition, it is necessary to A method can be adopted in which a mesh is placed on the mesh, a polymer cement composition is further applied over the mesh, and the mesh is fixed.

The cured product of polymer cement contains a cured product of a polymer cement composition that has excellent base crack followability and elongation performance, and therefore can have excellent waterproof performance.

The present disclosure will be explained below with reference to Examples, but the present invention is not limited to these Examples.

[Materials used]
<First raw material>
(1) Hydraulic component/Alumina cement: Manufactured by Imerys, Brain specific surface area: 3520cm ² /g
(2) Resin emulsion/Resin emulsion A: Commercially available acrylic copolymer emulsion (solid content concentration: 60% by mass, pH: 4.2, glass transition temperature (Tg): -34°C)
・Resin emulsion B: Commercially available ethylene, vinyl acetate, and copolymer emulsion (solid content concentration: 60%, pH: 4.5, glass transition temperature (Tg): -15°C)
(3) Setting retardant, phosphoric acid (commercially available): Concentration 85% or more, density 1.69 g/cm ³ or more (4) Setting accelerator, calcium formate (commercially available): Content 98% or more, lithium acetate (commercially available) : Content of 98% or more (5) Fine aggregate/silica sand (mass passing through a 100 mesh (150 μm) sieve is 40% or more, mass passing through a 140 mesh (106 μm) sieve is 10% or more, mass passing through a 70 mesh (212 μm) sieve is (silica sand with a particle size of 90% or more)
(6) Dispersant/SN Dispersant 5020 (manufactured by San Nopco Co., Ltd.): Approximately 40% active ingredient
(7) Thickener/SN Thickener 920 (manufactured by San Nopco Co., Ltd.)

Note that the glass transition temperature (Tg) of the resin component in the resin emulsion was measured by the following method. An appropriate amount of the resin emulsion was dropped onto a glass plate and dried at 60° C. for 16 hours to obtain a dried coating film having a weight in the range of 9.5 to 10.5 mg. The glass transition temperature of the dried coating film was measured using a differential scanning calorimeter (DSC) (manufactured by Shimadzu Corporation, DSC-50). The DSC measurement conditions were to raise the temperature from room temperature to 150°C in 10 minutes, hold the temperature at 150°C for 10 minutes, then lower the temperature to 50°C lower than the calculated Tg of the sample, and then raise it again to 150°C in 10 minutes. During heating, the first Tg was measured. Next, the second Tg was measured when lowering the temperature to a temperature 50° C. lower than the first Tg. In this specification, the second Tg is defined as the glass transition temperature (Tg) of the resin component.

<Second raw material>
(1) Basic aqueous solution/2-amino-2-methyl-1-propanol: An aqueous solution of a commercially available product prepared with distilled water to a concentration of 90%.Sodium hydroxide: A commercially available product adjusted to a concentration of 90% with distilled water. An aqueous solution prepared to

(Examples 1 to 3 and Comparative Example 1)
[Preparation of polymer cement composition]
A polymer cement composition was prepared using the raw materials shown in Table 1. In addition, the numerical values shown in Table 1 mean parts by mass. The numerical values for the resin emulsion mean parts by mass of the entire resin emulsion, and the numerical values in parentheses mean parts by mass of the solid content. First, water, a hydraulic component, a setting retardant, a setting accelerator, a dispersant, and a thickener were added to a stirring container, and these were stirred and mixed for 15 minutes. Thereafter, the resin emulsion and fine aggregate were added to the stirring container, stirred and mixed for further 10 minutes, and left to stand for one day to obtain the first raw material. Next, a basic aqueous solution as a second raw material was added to the obtained first raw material, and the mixture was stirred and mixed for 30 seconds to prepare a polymer cement composition.

[Evaluation of polymer cement composition and its cured product]
The following evaluations were performed using the polymer cement compositions of Examples 1 to 3 and Comparative Example 1 and their cured products.

(1) Measurement of viscosity Viscosity was measured using a B-type viscometer (Brookfield digital viscometer: RVDV-1+) and rotor No. 2 in an environment at a temperature of 23°C. 6 was used. The prepared polymer cement composition was quickly filled into a 200 mL cup, and immediately after filling, the spindle was set at 6 rpm (rotations/min), and the viscosity was measured 1 minute after the start of rotation. The results are shown in Table 1.

(2) Evaluation of pot life The prepared polymer cement composition is placed in a container, the container containing the polymer cement composition is tilted at predetermined intervals, and the pot life is defined as the time when the polymer cement composition stops flowing. evaluated. The results are shown in Table 1.

(3) Evaluation of base crack followability (evaluation of zero span elongation)
A 5 mm thick slate board (50 mm x 150 mm) with a cut in the center was prepared with a primer (when preparing the first raw material, 3 times the amount of water was added to the mass of the ingredients of the first raw material). A polymer cement composition (prepared in the same manner as the polymer cement compositions of each Example and Comparative Example except for the above) was applied in an amount of 0.2 kg/m ² . The prepared polymer cement composition was applied to the primer-coated surface of the slate board to a thickness of 2 mm using a trowel. After application, it was cured for 14 days at a temperature of 23±2° C. and a relative humidity of 50±5% to obtain a cured product of the polymer cement composition as a test specimen. Measurement of elongation by substrate crack followability test was carried out using a precision universal material testing machine (manufactured by Intesco Co., Ltd., 210XLS) with the test specimen at a measurement temperature of 0°C or 23°C, and at a tensile speed of 5 mm/min. Ta. The elongation when defects such as cracks occurred in the test specimen was measured by visual observation, and the elongation was evaluated as the ability to follow base cracks (zero span). The results are shown in Table 1.

(4) Evaluation of elongation performance A PET film was laid on a glass plate, the prepared polymer cement composition was applied on it to a thickness of 2 mm, and the coating film was formed at a temperature of 23 ± 2°C and a relative humidity of 50 ± 5%. It was cured for 7 days. Thereafter, the coating film was peeled off and further cured at 23±2° C. for 7 days to obtain a coating sheet. The elongation performance was evaluated by the elongation rate between gauge lines and the elongation rate between chucks. To measure the elongation rate, prepare a test piece from the coating sheet using a dumbbell No. 2 (based on JIS K 6251), draw a 20 mm wide marked line in the center of the test piece, and measure the thickness at three points in the 20 mm area. was measured and the average thickness was calculated. The test pieces were cured at each temperature for 12 hours or more and tested under the same temperature conditions. The test was carried out using a precision universal material testing machine (manufactured by Intesco Co., Ltd., product name: 210XLS), with the chuck interval (grip interval) adjusted to 60 mm. The test piece was pulled for several minutes until it broke, and the maximum tensile load, the distance between gauge lines, and the distance between chucks were measured, and the elongation rate was calculated. However, the elongation between the gauge lines was measured only at 23°C.
Elongation rate between gauge lines (%) = (B-A)/A x 100 (1)
(In formula (1), A is the length of the sample between the gauge lines (20 mm), and B is the length of the sample between the gauge lines at the time of rupture (distance between the gauge lines at the time of rupture).)
Elongation rate between chucks (%) = (B'-A')/A'×100 (2)
(In formula (1), A' is the length of the sample between the chucks (60 mm), and B' is the length of the sample between the chucks at the time of breakage (distance between the chucks at the time of breakage).)

As shown in Table 1, the polymer cement composition of the example using a basic aqueous solution containing an amine compound has a longer pot life than the polymer cement composition of the comparative example using a basic aqueous solution containing sodium hydroxide. It was excellent in terms of substrate crack followability and elongation performance. Furthermore, the polymer cement compositions of Examples 1 and 2 using a setting accelerator containing formate had a longer pot life than the polymer cement composition of Example 3 using a setting accelerator containing acetate. It was found that they tend to be excellent in terms of ability to follow cracks in the base and elongation performance. Furthermore, the polymer cement composition of Example 1 which used an acrylic copolymer emulsion as the resin emulsion had a lower temperature (0°C) than that of Example 2 which used an ethylene, vinyl acetate and copolymer emulsion as the resin emulsion. It was found that these materials tend to be superior in terms of substrate crack followability and elongation performance. From the above results, the polymer cement composition of the present invention has excellent safety during work, can secure a sufficient pot life after mixing the raw materials, and has a cured product that is It was confirmed that it has excellent substrate crack followability and elongation performance.

Claims (7)

A first raw material containing a hydraulic component including alumina cement, a resin emulsion, a setting retarder, and a setting accelerator;
a second raw material consisting of a basic aqueous solution containing an amine compound;
A raw material set for polymer cement compositions consisting of: The raw material set for a polymer cement composition according to claim 1, wherein the resin emulsion is an ethylene and vinyl acetate copolymer emulsion or an acrylic copolymer emulsion. The raw material set for a polymer cement composition according to claim 1 or 2, wherein the setting accelerator contains a formate. The raw material set for a polymer cement composition according to any one of claims 1 to 3, wherein the first raw material further contains fine aggregate. A polymer cement composition obtained by mixing the first raw material and the second raw material of the raw material set for a polymer cement composition according to any one of claims 1 to 4 . preparing a first raw material containing a hydraulic component including alumina cement, a resin emulsion, a set retarder, and a set accelerator;
adding a second raw material made of a basic aqueous solution containing an amine compound to the first raw material, and mixing the first raw material and the second raw material;
A method for producing a polymer cement composition, comprising: A cured polymer cement product comprising a cured product of the polymer cement composition according to claim 5 .