JP5276974B2 - Large tile adhesive - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a large-sized tile adhesive having excellent application property, durability and strength development. <P>SOLUTION: The tile adhesive contains (B) 24-99 pts.mass fine aggregate, (C) 3-25 pts.mass polymer, (D) 0.13-0.5 pts.mass water retaining agent using cellulose derivative or cellulose derivative and starch as effective ingredient and (E) 0.4-5 pts.mass alkaline earth metal sulfate per (A) 100 pts.mass hydraulic material. The ratio [(C)/(E)] by mass of (C) the polymer to (E) the alkaline earth metal sulfate is 2-19 expressed in terms of solid portion of the polymer and the ratio [(D)/(C)] of (D) the water retaining agent to (C) the polymer is 0.015-0.10 expressed in terms of solid portion of the polymer. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a cement-type tile adhesive that is excellent in workability, durability, and strength development and is suitable for large tile attachment.

In recent years, tiles are often constructed on the outer wall of an apartment house, the inner wall of an entrance part, the floor, the floor in the room, etc., and cement mortar, epoxy resin, etc. are generally used as the pasting material. In the case of large tiles with a tile size of 200 x 200 mm or more, polymer cement mortars that are either mechanically fixed to reinforced concrete or mixed with cement-based quick-setting materials or polymer cement mortars using ultrafast cement are devised. (Patent Documents 1 and 2).
In general, when tiles are attached to the outer wall, cement mortar with high adhesion strength is used in consideration of the risk of peeling off. However, in order to reduce the construction cost, there have been an increasing number of cases in which the direct construction method in which cement mortar is applied directly to the concrete frame is used. In the direct stretch construction method, construction management is difficult, and in a site where the construction area is large, it is difficult to stably provide adhesive strength with the concrete to the entire construction site. On the other hand, with the widespread use of water-soluble polymer emulsions, re-emulsifying powder resins, and lightweight aggregates, the use of these materials reduces Young's modulus (Patent Document 3) and improves bending toughness and elongation at break. By doing so, there has also been proposed a method for maintaining a stable adhesion to the differential movement (Patent Documents 4 and 5).
JP-A-6-80457 JP 2005-314220 A Japanese Patent Laid-Open No. 10-299220 Japanese Patent Application Laid-Open No. 2004-189469 JP 2006-273597 A

However, the large tile tensioning materials devised so far have been focused on quickly curing or pasting large tiles to the concrete in combination with super fast cement or polymer, so None of the workability and pot life were sufficiently secured, and lacked suitability for the realization site. In addition, the tile pasting material applied to mosaic tiles, double tiles and the like may be displaced even if a large tile is pasted.
Accordingly, an object of the present invention is to provide an adhesive for large tiles that is free from tile displacement and peeling when a large tile is attached, and that can secure sufficient workability and usable time.

  Therefore, as a result of various studies on adhesives suitable for large tile attachment, the present inventors have adjusted the blending ratio of alkaline earth metal sulfate and polymer, the blending ratio of water retention agent and polymer within a certain range, etc. Thus, it has been found that tile displacement and peeling at the time of large tile attachment can be prevented, and that even if there is a displacement after attachment, it can be appropriately corrected and stable adhesion strength to the concrete can be obtained. Completed.

  That is, the present invention relates to (A) 100 mass parts of hydraulic substance, (B) 24-99 mass parts of fine aggregate, (C) 3-25 mass parts of polymer, (D) cellulose derivative or cellulose derivative. A tile adhesive comprising 0.13 to 0.5 parts by mass of a water retention agent having an active ingredient and starch as an active ingredient, and (E) 0.4 to 5 parts by mass of an alkaline earth metal sulfate, ) The mass ratio [(C) / (E)] of the polymer and (E) alkaline earth metal sulfate is 2 to 19 in terms of solid content of the polymer, and (D) the mass ratio of the water retention agent and (C) polymer [ (D) / (C)] provides a large tile adhesive having a solid content of 0.015 to 0.10.

According to the present invention, it is possible to provide a tile adhesive for attaching large tiles that is excellent in workability, durability, and strength development. In particular, there is no displacement or peeling of tiles when attaching large tiles, and workability and usable time are sufficiently secured.

  The tile adhesive of the present invention contains (A) a hydraulic substance as a curing component. (A) A commercially available cement can be used as the hydraulic substance. This includes, for example, ordinary Portland cement, early-strength Portland cement, medium-heated Portland cement, mixed cement such as blast furnace cement and fly ash cement, and special cement such as white cement, jet cement and alumina cement. .

  The fine aggregate (B) used in the tile adhesive of the present invention is composed of ordinary aggregates such as quartz sand, cryolite, lime sand, river sand, land sand, crushed sand and perlite, ethylene vinyl acetate copolymer-calcium carbonate foam It is preferable to combine lightweight aggregates such as expanded polystyrene grains, and to take into account improvement in deformation followability and reduction in the static elastic modulus. (B) As for the compounding quantity of a fine aggregate, 24-99 mass parts is preferable with respect to 100 mass parts of hydraulic substances, 25-98 mass parts is more preferable, 35-70 mass parts is especially preferable. If it is less than 24 parts by mass, the drying shrinkage and the static elastic modulus of the tile adhesive material become large, and there is a possibility that the tile will float and peel off. If it exceeds 99 parts by mass, the strength may decrease, and the adhesion strength may also decrease.

  Furthermore, (B) The preferable compounding quantity of each of the normal aggregate of a fine aggregate and a lightweight aggregate is 22-96 mass parts with respect to 100 mass parts of (A) hydraulic materials, and a normal aggregate is lightweight aggregate. 0.6-3.7 mass parts is preferable. When the amount of ordinary aggregate is less than 22 parts by mass, the drying shrinkage and the static elastic modulus increase. When the amount exceeds 96 parts by mass, the workability is lowered and the adhesion strength is also lowered. Moreover, if a lightweight aggregate is less than 0.6 mass part, a static elastic modulus will become large, and when it exceeds 3.7 mass parts, intensity | strength and workability may fall.

Examples of the polymer (C) used in the tile adhesive of the present invention include re-emulsifying powder resin and polymer dispersion. As the re-emulsifying powder resin, a re-emulsifying powder resin specified in JIS A 6203 can be used. Moreover, as a polymer dispersion, what was similarly prescribed | regulated to JISA6203 can be used.
As re-emulsifying powder resin, powdered resin mainly composed of ethylene vinyl acetate, vinyl acetate / vinyl versatate, vinyl acetate / vinyl versatate / acrylic ester, polyacrylic ester, styrene butadiene, etc. is used. can do. As the polymer dispersion, a resin mainly composed of ethylene vinyl acetate, styrene butadiene, polyacrylic acid ester, or the like can be used. Moreover, the manufacturing method of re-emulsification type powder resin is not limited, You may manufacture by any manufacturing methods, such as a pulverization method and a blocking prevention method. Furthermore, the manufacturing method of a polymer dispersion is not limited, You may manufacture by any manufacturing methods, such as the manufacturing method which used surfactant as the emulsifier of a polymer dispersion.

  The blending amount of the polymer (C) is 3 to 25 parts by mass in terms of solid content with respect to 100 parts by mass of the (A) hydraulic substance, but is preferably 4 to 20 parts by mass, more preferably 5 to 19 parts by mass. is there. (C) If the blending amount of the polymer is less than 3 parts by mass, there is no effect of mixing, and if it exceeds 25 parts by mass, the viscosity increases and the workability decreases.

  The water retention agent (D) used for the tile adhesive of the present invention is a cellulose derivative or a cellulose derivative and starch. Any cellulose derivative may be used as long as it is soluble in water, for example, water-soluble cellulose such as methylcellulose, hydroxyethylcellulose, carboxymethylcellulose, hydroxypropylmethylcellulose, hydroxyethylcellulose, hydroxyethylmethylcellulose, hydroxypropylcellulose, cellulose sulfate, etc. Derivatives. Among these, methylcellulose, hydroxyethylcellulose, and hydroxypropylmethylcellulose are preferable.

  (D) It is possible to use starch together with a cellulose derivative as a water retention agent. As the starch, corn starch, potato starch, tapioca starch and the like can be used. A desirable ratio of the cellulose derivative and the starch is 4 to 12 parts by mass of the starch with respect to 100 parts by mass of the cellulose derivative. If the amount is less than 4 parts by mass, there is no mixed effect. If the amount exceeds 12 parts by mass, the viscosity increases, the workability decreases, and the setting time becomes long. There is a risk of poor curing in a low temperature environment.

  (D) The amount of the water retention agent is 0.13 to 0.5 parts by mass, more preferably 0.14 to 0.39 parts by mass with respect to 100 parts by mass of the (A) hydraulic substance. Preferably, it is 0.14-0.35 mass part. If it is less than 0.13 parts by mass, there is no mixed effect, and if it exceeds 0.5 parts by mass, there will be a delay in curing, strength development will be reduced, viscosity will be increased, and workability may be reduced.

  (D) Water retention and (C) polymer can be mixed with tile adhesive to improve water retention and adhesion to concrete and tile, but workability generally decreases due to increased viscosity. . However, the mixing ratio of (D) water retention agent and (C) polymer is 0.015 to 0.10, particularly 0.02 to 0.08 in terms of mass ratio [(D) / (C)] (in terms of polymer solid content). Further, by adjusting to 0.04 to 0.08, it is possible to improve the ironing workability of the tile adhesive and to prevent the tile from shifting. If it is less than 0.015, the water retention is lowered and there is a risk of causing dryout, and if it exceeds 0.10, there is a risk of causing a delay in setting.

The (E) alkaline earth metal sulfate used in the tile adhesive of the present invention is preferably magnesium sulfate, anhydrous gypsum, etc., and these can be used alone or in combination of two or more. . The blending amount is 0.4 to 5.0 parts by mass with respect to 100 parts by mass of the hydraulic substance, preferably 0.5 to 5.0 parts by mass, more preferably 1.5 to 4.0 parts by mass. is there. If the amount is less than 0.4 parts by mass, there is no mixing effect. The anhydrous gypsum is preferably type II anhydrous gypsum having a Blaine specific surface area of 6000 to 10,000 cm ² / g. If the Blaine specific surface area is less than 6000 cm ² / g, the reactivity is low and unreacted substances remain at low temperatures. In the realization field, there is a possibility that the reaction will start as the temperature and humidity rise, and expansion cracks may occur. If the Blaine specific surface area exceeds 10000 cm ² / g, the unit water volume increases, cracking may occur, and iron workability and strength development are reduced.
The mass ratio [(C) / (E)] of (C) polymer and (E) alkaline earth metal sulfate is 2 to 19 in terms of solid content of the polymer, preferably 3 to 18, particularly 3.5-17.5 are preferred.

  (A) When a hydraulic substance contains an alumina cement, it is desirable to mix and use a 1.5-3 mass% setting regulator with respect to 100 mass parts of hydraulic substances including an alumina cement. Further, the setting modifier may give a setting delay, for example, oxycarboxylic acids such as citric acid, tartaric acid, malic acid, gluconic acid, and succinic acid or their sodium, potassium, calcium, magnesium, ammonium, and aluminum A salt etc. can be mentioned. Examples of those that provide a curing accelerating effect include alkali carbonates such as lithium carbonate, sodium carbonate, potassium carbonate, ammonium carbonate, lithium bicarbonate, sodium bicarbonate, potassium bicarbonate, and ammonium bicarbonate. More preferably, when these organic acids and alkali carbonates are used singly or in combination of one or more, appropriate setting adjustment is possible.

  (A) When the hydraulic substance contains alumina cement, (E) alkaline earth metal sulfate is preferably 30 to 70 parts by mass, and further 35 to 69 parts by mass with respect to 100 parts by mass of alumina cement. Part. If it is less than 30 parts by mass, an appropriate effect of accelerating curing cannot be obtained at low temperatures, and if it exceeds 70 parts by mass, unreacted anhydrous gypsum remains and there is a concern that durability may be reduced.

  In addition to the above components, a water reducing agent can be used in the adhesive of the present invention. The water reducing agent used in the present invention can be used as long as the water reducing effect is not lost even when it is used in combination with a thickener and good workability can be obtained. For example, a polycarboxylic acid water reducing agent, manufactured by Taiheiyo Material Co., Ltd .: trade name “Core Flow NF-200” and the like can be mentioned. The blending amount of the water reducing agent is preferably 0.15 to 0.50 parts by mass, more preferably 0.19 to 0.46 parts by mass with respect to 100 parts by mass of the hydraulic substance.

The method for producing the tile adhesive of the present invention is not particularly limited, and can be produced by a general cement mortar or a cement paste in substantially the same manner. For example, the compounding material is put into a commercially available mortar mixer, It can be easily obtained simply by kneading as appropriate. In addition, the tile adhesive material of the present invention can be applied to any floor surface or wall surface, for example, by a plastering method using trowel coating that has been conventionally performed. By attaching the tile after the tile adhesive of the present invention is applied, the tile can be attached to the concrete frame.

  EXAMPLES Hereinafter, the present invention will be described in detail with reference to examples, but the present invention is not limited to the examples shown here.

Examples 1-6, Comparative Examples 11-16
Table 1 shows a blending example of the tile adhesive of the present invention, and Table 2 shows a blending example of the tile adhesive of the comparative example. The materials used are as follows.
<Materials used>
A1 Ordinary cement Taiheiyo Cement Co., Ltd. Product name Ordinary Portland Cement A2 Hayashi Cement Co., Ltd. Taiheiyo Cement Co., Ltd. Product name Hayashi Portland Cement A3 Alumina Cement Taiyo Materials Co., Ltd. Product name Taiheiyo Alumina Cement No. 1 A4 Jet Cement Onoda Chemico Co., Ltd. Trade name Super Jet Cement B1 Cold water stone particle size 0.3-1.2mm
B2 Silica sand No. 5 Maeda Kenshi Kogyo Co., Ltd. JIS No. 5 silica sand B3 Silica sand No. 7 Maeda Kenji Kogyo Co., Ltd.
B5 Obsidian foam Taiheiyo Material Co., Ltd. Maximum particle size 2mm Average particle size 0.8mm Bulk specific gravity 0.23kg / L
B6 Pearlite foam Taiheiyo Material Co., Ltd. Maximum particle size 1.2mm Average particle size 0.6mm Bulk specific gravity 0.19kg / L
B6 EVA-calcium carbonate foam 1 Maximum particle size 2mm Average particle size 0.8mm Bulk specific gravity 0.10kg / L
B7 EVA-calcium carbonate foam 2 Maximum particle size 1mm Average particle size 0.6mm Bulk specific gravity 0.11kg / L
D1 Water retention agent BASF Construction Systems Co., Ltd. Chiroze MH6002P4
Product name FIX1 made by D2 cornstarch Abebe
E1 Magnesium sulfate Commercial reagent Anhydrous magnesium sulfate E2 Type II anhydrous gypsum Type II anhydrous gypsum Brane specific surface area 8000cm ² / g
F Water reducing agent Taiyo Material Co., Ltd. Product name Core Flow NF-200
G1 Lithium carbonate Commercial reagent Lithium carbonate G2 Rochelle salt Commercial reagent Potassium sodium tartrate C1 EVA powder resin Commercial product Re-emulsified powder resin Ethylene vinyl acetate copolymer C2 Acrylic emulsion Product name made by Nichigo Movinyl Co., Ltd. Movinyl 7700

[Consistency assessment]
For the tile adhesive, the flow value of the mortar immediately after being kneaded in a laboratory at 20 ° C. was measured by a method based on JIS R5201, and it was used as an evaluation index as to whether a consistency suitable for tile construction was obtained. The consistency is determined to be suitable for tile construction if the flow value is between 160 and 180 mm.

[Measurement of unit volume mass]
The unit volume mass of the produced tile adhesive was measured with a 500 mL stainless steel container according to JIS A1171.

[Measurement of pot life]
After measuring the flow value of the mortar immediately after being kneaded in a laboratory at 20 ° C. by a method according to JIS R5201, the flow value was measured every 15 minutes and the time during which 160 to 180 mm was maintained was defined as the pot life.

[Evaluation of bending strength]
The bending strength was measured according to JISR5201 using a 4 × 4 × 16 cm specimen for strength test measurement prepared in a laboratory at a temperature of 20 ° C. and a humidity of 60% in accordance with the standards of the Public Building Association. The specimens were subjected to 24-hour wet air curing in a curing tank maintained at a temperature of 20 ° C. and a humidity of 80%, and then cured in a test room at a temperature of 20 ° C. and a humidity of 60% until a predetermined age. The bending strength test was carried out at a material age of 7 days.

[Evaluation of compressive strength]
The compressive strength was measured by JISR5201 using the specimen after the end of the bending strength test on the age of 7 days.

[Evaluation of adhesion strength in standard curing]
In accordance with the standards of the Tile Industry Association, a tile adhesive was applied in a thickness of 4 mm to a concrete plate of 300 × 300 × 60 mm in a laboratory at a temperature of 20 ° C. and a humidity of 60%, and a small tile was attached. It was cured in a laboratory at a temperature of 20 ° C. and a humidity of 60% until a predetermined age, and the adhesion strength was measured at an age of 7 days.

[Evaluation of adhesion strength due to thermal degradation]
In accordance with the standards of the Tile Industry Association, a tile adhesive was applied to a 300 × 300 × 60 mm concrete plate in a thickness of 5 mm in a laboratory at a temperature of 20 ° C. and a humidity of 60%, and a small tile was attached. Curing was carried out in a laboratory at a temperature of 20 ° C. and a humidity of 60% until the age of 14 days.

[Evaluation of adhesion strength by repeated heating and cooling]
According to the Japan Architectural Institute of Finishing Standards M-101 water absorption adjusting material for cement mortar coating, a tile adhesive is applied to a concrete plate of 300 x 300 x 60 mm at a thickness of 5 mm in a laboratory at a temperature of 20 ° C and a humidity of 60%. A small tile was attached. Five surfaces other than the tiled surface were sealed with a silicon sealing material at a material age of 10 days, and the test was started at a material age of 14 days. The test was performed for 300 cycles and adhesion strength was performed.
The above test results are shown in Tables 3 and 4.

Workability In order to check the iron workability of tile adhesive and the tile attaching performance, a concrete board of 600 × 1500 × 90 mm is set up vertically, and the tile adhesive is applied 5 mm thick with 400 × 1000 mm gold trowel 45 three-clad Two tiles were pasted, the tiles were removed immediately, and the following items were evaluated.

[Evaluation method of iron workability]
The elongation of the iron is 600 × 1500 × 90 mm on a vertical concrete plate, spread with a gold trowel, and the one with low resistance to make it 5 mm thick and the one with less than 5 minutes spread are good (○ ), And those with a large resistance that took 5 minutes or more were defined as defective (x). Moreover, the thing in which the tile adhesive did not remain in the used gold trowel was defined as good (◯), and the one remaining on the gold trowel was defined as poor (x). The presence or absence of sagging was evaluated as good (◯) when sagging did not occur immediately after application, and defective (×) when sagging occurred. If there was a defect (x) even in one of the three items, the evaluation was a defect x.

[Evaluation method of tile attachment performance and adhesion performance]
A case where no deviation occurred even after 10 minutes of pasting the tile was evaluated as good (◯), and a case where a shift occurred immediately after the pasting, or a case where the tile was not attached and difficult to be pasted was judged as poor (×).
Both three tiles that tile adhesive to the entire back surface is adhered to a good (○), those tile adhesive to the back surface of the tile is not attached, those tiles was difficult stuck not adhere Was determined to be defective (x).
If even one of the two items is defective (x), the evaluation is defective (x).
Table 5 shows the evaluation of workability.

  As is apparent from Tables 3 to 5, it can be seen that the large tile adhesive of the present invention is excellent in durability, strength development and workability.

Claims (4)

(A) 24 to 99 parts by mass of fine aggregate, (C) 3 to 25 parts by mass of polymer, (D) cellulose derivative or cellulose derivative and starches as active ingredients with respect to 100 parts by mass of hydraulic substance A tile adhesive comprising 0.13 to 0.5 parts by mass of a water retention agent and (E) alkaline earth metal sulfate 0.4 to 5 parts by mass, comprising (C) a polymer and (E) The mass ratio [(C) / (E)] of the alkaline earth metal sulfate is 3.5 to 17.5 in terms of the solid content of the polymer, and (D) the mass ratio of the water retention agent and (C) the polymer [(D ) / (C)] is a large-sized tile adhesive having a polymer solid content of 0.02 to 0.08 . (D) The large tile adhesive according to claim 1, wherein the water retention agent is a cellulose derivative. (A) The large tile adhesive according to claim 1 or 2, wherein the hydraulic substance contains alumina cement. The large tile adhesive according to any one of claims 1 to 3, wherein the polymer is a polymer dispersion for cement admixture and / or a re-emulsifying powder resin.