JPH09286653A - Cement-based substrate adjustment composition - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a composition which causes no defect such as peeling or lifting even when the surface layer before adjustment consists of a flexible material such as asphalt, methane resin or rubber sheet, and has a >=0.4N/mm<2> adhesion strength, good roller workability and also good properties with respect to finishing. SOLUTION: This composition consists of 100 pts.wt. of cement, 50 to 300 pts.wt. of fine aggregate, 15 to 40 pts.wt. of a re-emulsified powdery resin, 0.3 to 3.5 pts.wt. of a water reducing agent and 0.02 to 0.30 pts.wt. of a water-soluble polyacrylamide-based polymer, wherein the water-soluble polyacrylamide- based polymer contains acrylamide-(sodium-2-acryloylamino-2-methyl- propanesulfonate) as a main repeating unit. Also, an aq. solution contg. 0.5wt.% of the polyacrylamide-based polymer has 50 to 160mPa.s and 15 to 50mPa.s plastic viscosity values at 10(s<-1> ) and 100(s<-1> ) shear rates respectively, wherein an E type viscometer is used for the measurement.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a base material used for adjusting a base material when a finish coating material or a waterproof film is applied to a soft base material such as an outer wall of a building structure, a rooftop, a veranda, an open corridor or a floor. More particularly, the present invention relates to a cement-based undercoating composition suitable for roller construction and having improved adhesive strength with a soft old surface layer such as asphalt, urethane, or rubber sheet.

[0002]

2. Description of the Related Art In a building structure, when a finish coating material or waterproof material which is a surface layer such as an outer wall, a rooftop, a veranda, an open corridor or a floor has a defect, a new finish coating material or a waterproof coating film is newly added. It is necessary to carry out renovation work using wood to renew the surface layer. In this case, practically sufficient adhesiveness cannot be obtained between the old and new surface layers, and it is generally practiced to intervene the adhesion with the old and new surface layers by interposing an undercoating material between them. .

As such a composition for preparing a groundwork, cement, fine aggregate and emulsion or re-emulsifying powder resin, and optionally cement containing an admixture (thickener, water reducing agent, etc.), fiber material and the like. A base conditioning composition for a system is known.

[0004]

The conventional cement-based composition for adjusting the groundwork has a sufficient adhesive strength when the old surface layer is hard such as concrete. However, when the old surface layer is soft such as asphalt, urethane, rubber sheet, etc., a bond strength of 0.4 N / mm ² or more can be obtained without causing defects such as peeling or floating in the base conditioning material layer. I wanted Therefore, if a soft surface such as asphalt, urethane, or rubber sheet is the old surface layer, completely remove the asphalt, urethane, rubber sheet, etc., and expose the hard foundation layer such as concrete before adjusting the foundation. It was necessary to apply the material, which was troublesome.

[0005]

Means for Solving the Problems Accordingly, the present inventors have:
Even if soft asphalt, urethane, rubber sheet, etc. is the old surface layer, it has an adhesive strength of 0.4 N / mm ² or more that does not cause defects such as peeling and floating, and also has roller workability and finishability. As a result of earnest research on a good cement-based undercoating composition, it was found that the use of a specific water-soluble polyacrylamide polymer and the formulation of the cement-based undercoating composition should be specified, and the present invention Reached

That is, a feature of the present invention is that in a cement-based base conditioning composition comprising cement, fine aggregate, re-emulsifying powder resin, water reducing agent and water-soluble polyacrylamide polymer, 100 parts by weight of cement and fine bone are used. Material 50-30
0 parts by weight, 15 to 40 parts by weight of re-emulsifiable powder resin, 0.3 to 3.5 parts by weight of water reducing agent and 0.02 to 0.30 parts by weight of water-soluble polyacrylamide polymer. The polymer has a plastic viscosity of 50 to 160 mPa · s at a shear rate of 10 (s ⁻¹ ) measured with an E-type viscometer at 20 ° C. of a 0.5 wt% aqueous solution of the water-soluble polyacrylamide polymer, and The plastic viscosity at the same shear rate of 100 (s ⁻¹ ) is 15 to 50 mPa · s.

The water-soluble polyacrylamide polymer preferably contains acrylamide.2-acryloylamino-2-methylpropanesulfonic acid sodium salt as a main repeating unit.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION When the old surface layer, that is, the base surface before adjustment is a soft one such as asphalt, urethane or rubber sheet, the base adjusting material is generally applied by rollers. For this reason, the fluidity of the base conditioning material is "JASS 1
5M-103 (SL material test method) ", the Smith flow value is preferably in the range of 140 to 190 mm, and more preferably 160 to 170 mm. The viscosity is preferably such that the plastic viscosity measured by an E-type viscometer is in the range of 100 to 3000 mPa · s, and even more preferably 1000 to 2600 mPa · s.

The water-soluble polyacrylamide-based polymer according to the present invention is a polymer of the polyacrylamide-based polymer of 0.
The plastic viscosity at a shear rate of 10 (s ^-1 ) measured with an E-type viscometer at 20 ° C. of a 5 wt% aqueous solution is 50 to 160 m.
Pa · s and a plastic viscosity at a shear rate of 100 (s ⁻¹ ) of 15 to 50 mPa · s, and more preferably within the above range, the viscosity ratio calculated by the formula (1) is 0. ．
2 to 0.35.

0.5 of the polyacrylamide polymer
A water-soluble polyacrylamide-based polymer having a shear rate of 10 (s ^-1 ) and a shear rate of 100 (s ^-1 ) measured by an E-type viscometer at 20 ° C. in an aqueous solution of 10 wt% is outside the range of asphalt. The adhesive strength to urethane, rubber sheet, etc. is less than 0.4 N / mm ² .

Further, even polymers other than polyacrylamide type polymers have low adhesion strength to asphalt, urethane, rubber sheets and the like.

The water-soluble polyacrylamide polymer component is 0.5% by weight of the polyacrylamide polymer.
There is no particular limitation as long as the plastic viscosity of the aqueous solution at a shear rate of 10 (s ^-1 ) and a shear rate of 100 (s ^-1 ) measured by an E-type viscometer is within the above range, Acrylamide-2 with good durability
-It is preferable to use a water-soluble polyacrylamide-based polymer having sodium acryloylamino-2-methylpropanesulfonate as a main repeating unit.

The re-emulsifiable powder resin in the present invention is one which is easily re-emulsified in the presence of water to be redispersed in water to form a polymer dispersion, and a water-soluble polymer-based protective colloid is used as a protective layer. Vinyl-based re-emulsifying powder resin, and acrylic acid ester-based re-emulsifying powder resin having a surfactant as a protective layer are exemplified, and these are the respective polymer dispersions as the anti-blocking agent and various additives. It is obtained by spray drying with. In addition, a core-shell structure in which a polymer is copolymerized at 20 ° C. or more in the shell portion of re-emulsifiable powder resin without using an antiblocking agent, and the outermost surface layer of the shell portion is copolymerized with an unsaturated carboxylic acid. It is also possible to use a re-emulsifiable powder resin obtained by spray-drying the carboxylated polymer dispersion.

The glass transition temperature of the re-emulsifiable powder resin is the main component of the re-emulsifiable powder resin when the work is carried out near room temperature in consideration of the use conditions of the cement-based ground control composition. It preferably has a glass transition temperature of 20 ° C. or lower, and particularly preferably 0 ° C. or lower when the work is performed outdoors in winter and the like.

Further, even a re-emulsifying powder resin having a glass transition temperature of 0 ° C. or higher can be used even in the winter season by simultaneously using a powdery film forming aid such as caprolactam or neopentyl glycol. You can

The vinyl resin having a water-soluble polymer protective colloid as a protective layer and the acrylic ester type re-emulsifiable powder resin having a surfactant as a protective layer are not particularly limited in their monomer composition. Examples thereof include polymers and copolymers of vinyl acetate, vinyl versatate, ethylene, butadiene, acrylic acid ester, styrene, vinyl chloride and the like.

As the cement in the present invention, for example, ordinary Portland cement, early-strength Portland cement, medium-heat Portland cement and other Portland cement, blast furnace cement and other mixed cement, rapid hardening cement and the like can be used. It may also be a mixture of these cements.

The material of the fine aggregate used in the present invention is not particularly limited, but the maximum grain size is the fine aggregate having the maximum grain size suitable for the condition of the unevenness of the substrate to be adjusted and the construction tool. Should be appropriately selected. A guideline is about 0.05 to 1 mm. When the coating thickness is thin, a fine one is used, and when it is thick, a coarse one is used. As the fine aggregate, silica sand, natural sand, blast furnace slag fine sand, lightweight aggregate, etc. can be used as they are or in a mixture thereof.

Examples of the water reducing agent in the present invention include:
A β-naphthalene sulfonic acid type water reducing agent, a melamine type water reducing agent, a polycarboxylic acid type water reducing agent and the like can be used.

In the cement-based base conditioning composition of the present invention, the mixing ratio of cement, fine aggregate, re-emulsifying powder resin, water reducing agent and water-soluble polyacrylamide polymer is 100 parts by weight of cement and 50 fine aggregate. ~ 300 parts by weight, re-emulsifying powder resin 15 to 40 parts by weight, water reducing agent 0.3
To 3.5 parts by weight and 0.02 to 0.30 parts by weight of a water-soluble polyacrylamide polymer. More preferably, 100 parts by weight of cement, 80 to 200 parts by weight of fine aggregate, 20 to 30 parts by weight of re-emulsifying powder resin, and water reducing agent 0.7.
To 2.0 parts by weight and 0.03 to 0.15 parts by weight of the water-soluble polyacrylamide polymer.

If the water-soluble polyacrylamide polymer is less than 0.02 parts by weight with respect to 100 parts by weight of cement, the adhesion strength to asphalt, urethane, rubber sheet, etc. will be less than 0.4 N / mm ² , and 0.30 parts by weight. If it exceeds the range, the water / cement ratio becomes large in order to obtain the above-mentioned fluidity and plastic viscosity, and the adhesion strength to asphalt, urethane, rubber sheet, etc. becomes less than 0.4 N / mm ² .

If the re-emulsifying powder resin is less than 15 parts by weight with respect to 100 parts by weight of cement, the adhesion strength to asphalt, urethane, rubber sheet, etc. is 0.4 N / mm ^2.
If it exceeds 40 parts by weight, the water / cement ratio becomes large in order to obtain the above-mentioned fluidity and plastic viscosity, and the adhesion strength to asphalt, urethane, a rubber sheet, etc. becomes less than 0.4 N / mm ² . Since the polymer film is formed on the surface of the undercoating material after curing, the finishability is deteriorated.

If the fine aggregate is less than 50 parts by weight with respect to 100 parts by weight of cement, the adhesion strength to asphalt, urethane, rubber sheet, etc. will be less than 0.4 N / mm ^2, and if it exceeds 300 parts by weight, workability will be poor. In addition, the adhesion strength to asphalt, urethane, rubber sheets, etc. is less than 0.4 N / mm ² .

If the water-reducing agent is less than 0.3 parts by weight relative to 100 parts by weight of cement, the water / cement ratio becomes large in order to obtain the above-mentioned fluidity and plastic viscosity, and adhesion to asphalt, urethane, rubber sheets, etc. Strength is 0.4 N / m
If it is less than m ^2, and if it exceeds 3.5 parts by weight, the cost of the base conditioning composition becomes high and the adhesion strength to asphalt, urethane, rubber sheet, etc. becomes less than 0.4 N / mm ² .

It should be noted that plasticizers, fiber materials, admixtures (eg
A waterproofing agent, a dispersant, a stabilizing agent, a defoaming agent, etc.) and an inorganic powder (eg, calcium carbonate, clay, talc, mica, silica stone, etc.) may be added to such an extent that the object of the present invention is not affected.

Ion-exchanged water, distilled water, tap water, etc. are added to the above-mentioned cement-based base conditioning composition to prepare a base conditioning material.

For mixing the respective constituent materials in the production of the above-mentioned base conditioning material, for example, a conventionally used mixing device such as a Hobart mixer may be used. In this case, the order of adding the constituent materials to the mixing device, the mixing time, and the like are not particularly limited.

The base conditioning material is preferably applied with a roller after cleaning the old surface layer with a deck brush or the like.

[0029]

The present invention will be described below with reference to examples. 1. Materials used Water-soluble polyacrylamide polymer 0.5 of water-soluble polyacrylamide polymer used
Table 1 shows the plastic viscosities of the wt% aqueous solution at 20 ° C. at shear rates of 10 (s ⁻¹ ) and 100 (s ⁻¹ ). In addition,
The plastic viscosity was measured with an E-type viscometer manufactured by Tokyo Keiki. Re-emulsifiable powder resin a; acrylic ester: vinyl acetate: vinyl versaticate = 30:30:40 (weight ratio), glass transition temperature 0 ° C b; methyl methacrylate: 2-ethylhexyl acrylate = 61:39 (weight ratio) ), Glass transition temperature 10 ° C .; ethylene: vinyl acetate = 89: 11 (weight ratio), glass transition temperature 10 ° C. Other materials Cement; Early Strength Portland Cement (manufactured by Nippon Cement Co., Ltd.) Fine aggregate; Quartz sand No. 8 (Manufactured by Nippon Cement Co., Ltd.) Water; tap water reducing agent; a: Mighty 100 (manufactured by Kao Corporation) (β
-Naphthalenesulfonic acid type) b: Melment F10M (manufactured by SKW Co., Ltd.) (melamine type)

[0030] 2. Mixing and Mixing The above materials were kneaded for 4 minutes with a Hobart mixer manufactured by Hobart Co., Ltd. according to the compositions shown in Tables 2 to 4.

[0031]

[0032]

[0033]

3. Evaluation Smith flow The Smith flow value was measured according to JASS 15M-103 "Test method for SL material". Plastic viscosity The plastic viscosity was measured at 0 to 50 rpm using an E-type viscometer manufactured by Tokyo Keiki. Finishability 900 x 900 x 6 m with urethane waterproof layer formed on the surface
Prepare a slate plate of m, and on this urethane waterproof layer surface,
The base adjusting material was applied using a medium-hair roller to a coating thickness of 1 mm. After 48 hours at 20 ° C., the difference in the unevenness of the undercoating material layer was measured with a caliper, and the difference in the unevenness was 0.5 m.
When less than m, ○, 0.5 to 1.0 mm is Δ, 1.0 m
The case where m was exceeded was defined as x. Adhesion strength Prepare a 900 x 900 x 6 mm slate plate with a urethane waterproof layer formed on the surface / or asphalt roofing attached so that the coating thickness is 1 mm on this urethane waterproof layer surface / or asphalt roofing surface. Apply the undercoating conditioner to 20 ℃ and relative humidity of 65%.
After curing for 4 days, the adhesive strength was measured according to “JIS A 6916 (primer coating material for finish coating material)”. Incidentally, with respect to some of the base conditioning materials, the adhesive strength to the butyl rubber sheet was similarly measured.

The results of these measurements are shown in Tables 5 and 6.

[0036]

[0037]

Conducted Experiment After cleaning the urethane coating waterproof layer 7 years after construction and the asphalt roofing surface 10 years after construction with a deck brush, No. 2 in Table 2 was used. The base adjusting materials 2 and 8 were applied by a roller so that the applied thickness was 1 mm. After 14 days, using a Kenken-type adhesion tester in accordance with “JIS A 6916 (primer coating material for finish coating material)”,
The adhesive strength was measured. The construction area is 50
It was carried out at m ² .

The results are shown in Table 7.

Examples 1 to 7 were evaluated by changing the type and blending ratio of the water-soluble polyacrylamide polymer, but 2 of 0.5% by weight aqueous solution specified in the present invention was used.
Shear rate 10 measured with an E-type viscometer at 0 ° C
The plastic viscosity at (S ^-1 ) is 50 to 160 mPa · s, and the plastic viscosity at the same shear rate 100 (S ^-1 ) is 15 to 5
Using a water-soluble polyacrylamide-based polymer of 0 mPa · s, the water-soluble polyacrylamide-based polymer is 0.02-0.3 per 100 parts by weight of cement.
In the cement-based undercoating composition of 0 parts by weight, the finish was good and the adhesive strength with urethane, asphalt and rubber sheets was high.

On the other hand, as shown in Comparative Examples 5 to 6, 0.5
The plastic viscosity at a shear rate of 10 (S ⁻¹ ) measured by an E-type viscometer at 20 ° C. of a wt% aqueous solution is 50 to 160 mPas.
.S and a plastic viscosity at a shear rate of 100 (S.sup.- ¹ ) other than 15 to 50 mPa.s is used, or when a water-soluble polyacrylamide polymer is used, as shown in Comparative Example 7. When other polymers were used, the adhesion strength with urethane, asphalt and rubber sheets was less than 0.4 N / mm ² .

Further, as shown in Comparative Examples 1 and 3, when the water-soluble polyacrylamide polymer is less than 0.02 parts by weight relative to 100 parts by weight of cement, the adhesive strength with urethane and asphalt is 0.4 N / mm. It was less than ² . As shown in Comparative Examples 2 and 4, when the amount of the water-soluble polyacrylamide polymer exceeded 0.30 parts by weight, the adhesion strength of urethane and asphalt was also low.

Examples 8 to 11 were evaluated by changing the compounding ratio of the fine aggregate, and 50 to 300 parts by weight of the fine aggregate was added to 100 parts by weight of the cement specified in the present invention. The cement-based undercoating composition had good finishability and high adhesive strength with urethane, asphalt, and rubber sheets.

On the other hand, as shown in Comparative Example 8, the fine aggregate was 5
If it is less than 0 parts by weight, the adhesion strength with urethane and asphalt is less than 0.4 N / mm ² . As shown in Comparative Example 9, when the fine aggregate exceeded 300 parts by weight, the adhesive strength with urethane and asphalt was less than 0.4 N / mm ² .

Examples 12 to 15 were evaluated by changing the blending ratio of the re-emulsifying powder resin. The re-emulsifying powder resin was added to 15 to 100 parts by weight of the cement specified in the present invention. With 40 parts by weight of the cement-based undercoating composition, the finish was good and the adhesion strength with urethane and asphalt was high.

On the other hand, as shown in Comparative Examples 10 and 12, when the re-emulsifying powder resin was less than 15 parts by weight, the adhesion strength with urethane and asphalt was less than 0.4 N / mm ² . Further, as shown in Comparative Examples 11 and 13, when the re-emulsifiable powder resin exceeded 40 parts by weight, the adhesion strength with urethane and asphalt was less than 0.4 N / mm ² .

In Examples 16 to 19, the cement-based base conditioning composition in which the type of the re-emulsifiable powder resin was changed was evaluated, and all of them had good finish and urethane. Adhesion strength with asphalt, rubber sheet and rubber sheet was high.

In Examples 20 to 22, the cement-based undercoating composition was evaluated in which the addition ratio of the β-naphthalenesulfonic acid-based water reducing agent was changed, and 100 parts by weight of the cement specified in the present invention was evaluated. On the other hand, in the case of 0.5 to 3.5 parts by weight, the finish was good and the adhesion strength with urethane and asphalt was high.

On the other hand, as shown in Comparative Example 14, when the amount of the β-naphthalenesulfonic acid type water reducing agent is less than 0.5 part by weight, the adhesion strength with urethane and asphalt is 0.4 N / m.
It was less than m ² . As shown in Comparative Example 15, when the amount of the β-naphthalenesulfonic acid-based water reducing agent exceeds 3.5 parts by weight, the adhesion strength with urethane and asphalt is 0.4 N / m.
It was less than m ² .

In Examples 23 to 24, the cement-based base conditioning composition using the melamine water-reducing agent was evaluated, and the finishing properties were good and the adhesion strength with urethane and asphalt was good. it was high.

Further, as shown in Table 7, the adhesive strength was also high for the urethane coating waterproof layer 7 years after the construction and the asphalt roofing 10 years after the construction.

[0052]

EFFECTS OF THE INVENTION The cement-based undercoating composition of the present invention does not cause defects such as peeling or floating in the undercoating material layer even when a soft asphalt, urethane, rubber sheet or the like is the old surface layer. It can have an adhesive strength of 0.4 N / mm ² or more. Also, workability in roller construction,
Good finishability

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Claims (2)

[Claims] 1. Cement, fine aggregate, re-emulsifiable powder resin,
In a cement-based ground control composition comprising a water reducing agent and a water-soluble polyacrylamide polymer, 100 parts by weight of cement, 50 to 300 parts by weight of fine aggregate, 15 to 40 parts by weight of re-emulsifying powder resin, water reducing agent 0.3 ~ 3.
5 parts by weight and 0.02 to 0.30 parts by weight of the water-soluble polyacrylamide polymer, wherein the water-soluble polyacrylamide polymer is an E-type viscometer in a 0.5 wt% aqueous solution of the water-soluble polyacrylamide polymer. The measured plastic viscosity at a shear rate of 10 (s ^-1 ) is 50 to 16
A cement-based base conditioning composition, which has a plastic viscosity of 15 to 50 mPa · s at a shear rate of 100 (s ⁻¹ ) at ⁰ mPa · s. 2. The cement-based composition for preparing a groundwork according to claim 1, wherein the water-soluble polyacrylamide polymer has acrylamide.2-acryloylamino-2-methylpropanesulfonic acid sodium salt as a main repeating unit.