JP2013095615A - Highly-durable finishing material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a superior cement-based highly-durable finishing material which is excellent in durability and antifouling properties and has a good color of finish, and further which is suitable for diversity in moldability (surface shape/pattern and its execution means).SOLUTION: This highly-durable finishing material includes (A) 100 pts.mass white cement, (B) 230-360 pts.mass fine aggregate having a density of ≥2.0 g/cm, and constituted of the granularity comprising a 35-50 mass% particle size of ≥600 to <2,500 μm, a 30-45 mass% particle size of ≥300 to <600 μm and a ≤25 mass% particle size of <300 μm, (C) 3-5 pts.mass metakaolin, (D) a 0.3-2.5 pts.mass hygroscopic clay mineral, (E) a 0.07-0.70 pt.mass silane-based water repellent, and (F) a 3-17 pts.mass polymer in terms of a solid portion, wherein both of (B) and (D) show a chroma of ≤0.5 and a lightness of ≥9 in the Munsell color system.

Description

  The present invention relates to a cement-based high durability finishing material used for an outer wall of a building.

  In recent years, the exterior walls of apartment buildings and concrete public buildings are often tiled. The tile finish is excellent in antifouling property, and it is excellent in that it can maintain the original aesthetic for a long time without UV deterioration. The problem is that a serious accident may occur if the product is lifted or peeled off due to poor construction. On the other hand, the outer wall of a detached house is often constructed with a resin-based finish using siding that is easy to construct and has excellent durability.

  Cement-based finishing materials have less UV degradation than resin-based finishing materials, but it is difficult to maintain aesthetics due to cracks and dirt, which are the problems of cement-based materials. Therefore, as a general measure, a paint is applied to the surface to impart antifouling properties, but it is subject to UV degradation like a resin-based finish. In order to improve the durability of cement mortar, mixing a polymer and a pozzolanic substance has been devised (Patent Document 1). In addition, as a countermeasure against cracks, a method of mixing a polymer, an expansion material, a shrinkage reducing agent, and fibers has been devised (Patent Document 2).

JP-A-2005-187281 JP-A-2005-336952

However, in the polymer cement mortars described in Patent Documents 1 and 2, the color of the finished product is limited, and the polymer cement mortar is not fully satisfactory in terms of formability such as surface shape and pattern and workability.
Therefore, the present invention provides an excellent cement-based high durability finishing material that is excellent in durability and antifouling properties, has a good finished color, and is suitable for a variety of formability (surface shape / pattern and its construction means). The issue is to provide.

  Therefore, as a result of various studies to solve the above problems, the present inventor has adopted white cement as the cement, adjusted the particle size distribution of the fine aggregates to a certain range, and has high whiteness of the pozzolanic substance metakaolin and moisture absorption. When mixed with a clay mineral, a finished cement with a high durability, excellent finish color, excellent finish pattern diversity, good workability, and excellent antifouling properties can be obtained. The present invention has been completed.

That is, the present invention
(A) 100 parts by weight of white cement,
(B) Density of 2.0 g / cm ³ or more, particle size of 600 μm or more and less than 2500 μm is 35 to 50% by mass, particle size of 300 to 600 μm is 30 to 45% by mass, and particle size of less than 300 μm is 25% by mass or less. Composed of 230 to 360 parts by mass of fine aggregate,
(C) 3-5 parts by mass of metakaolin,
(D) 0.3 to 2.5 parts by mass of a hygroscopic clay mineral,
(E) Silane water repellent 0.07 to 0.70 parts by mass and (F) 3 to 17 parts by mass of polymer in terms of solid content,
Both (B) and (D) provide a highly durable finishing material characterized by exhibiting a saturation of 0.5 or less and a brightness of 9 or more in the Munsell color system.

  The high durability finishing material of the present invention has excellent finish pattern diversity, durability, antifouling properties, and workability, and is used as a finishing material for apartment buildings and concrete public buildings, especially for exterior walls. It will be possible to maintain the original aesthetic for a long time.

For the highly durable finish of the present invention, (A) white cement is used. By using white cement, the whiteness of the highly durable finish is improved and the degree of freedom in coloring is improved. (A) A commercially available white cement can be used as the white cement. The commercially available white cement is preferably one in which Fe ₂ O ₃ is adjusted to around 0.2% in order to make the color white. For example, the trade name “White Cement” manufactured by Sanyo White Cement Co., Ltd., and the product name “White Cement” manufactured by Aso Hiro Ankei White Water Mud Co., Ltd. can be used.

The fine aggregate (B) used in the present invention has a density of 2.0 g / cm ³ or more, a particle size of 600 μm or more and less than 2500 μm is 35-50 mass%, and a particle size of 300 μm or more but less than 600 μm is 30-45 mass. %, A particle size of less than 300 μm is less than 25% by mass. (B) By adjusting the particle size distribution of the fine aggregate within this range, a finishing material having good workability (trowel workability) and excellent finish pattern diversity can be obtained.

If the fine aggregate having a particle size of 600 μm or more and less than 2500 μm exceeds 50% by mass, the construction method and the finished pattern are limited, and a finished material excellent in diversity of finished patterns cannot be obtained. If the fine aggregate having a particle size of 600 μm or more and less than 2500 μm is less than 35% by mass, the water-cement ratio increases and an appropriate construction thickness cannot be obtained, and the finished pattern has a low design. In addition, as the water-cement ratio increases, drying shrinkage also increases, and cracks may occur. When the particle size of 300 μm or more and less than 600 μm is larger than 45% by mass, the proportion of fine aggregates having a particle size of 600 μm or more and less than 2500 μm and a particle size of less than 300 μm is reduced, the finished pattern is limited, and the variety of formability is lost. The design will be low. When the particle size of less than 300 μm exceeds 25% by mass, fine aggregates having a particle size of 600 μm or more and less than 2500 μm and a particle size of 300 μm or more and less than 600 μm are reduced, and an appropriate construction thickness cannot be obtained and the finished pattern is limited. The Further, when the fine aggregate having a particle size of less than 300 μm is increased, the water cement ratio is increased, the drying shrinkage is increased, and cracking may occur.
(B) The preferable density of the fine aggregate is 2 to 4 g / cm ³ . Further, the preferable particle size distribution is 40 to 50% by mass when the particle size is 600 μm or more and less than 2500 μm, 30 to 40% by mass when the particle size is 300 to 600 μm, and 15 to 25% by mass when the particle size is less than 300 μm.
In order to adjust the particle size distribution in this manner, a commercially available fine aggregate with a controlled particle size is appropriately combined and blended.

(B) The color tone of the fine aggregate is preferably 0.5 or less and 9 or more in the Munsell color system. If a fine aggregate with a color saturation exceeding 0.5 is used, the fine aggregate will not be noticeably uniform in color due to the color difference from the white cement, resulting in a poorly designed finish. . Similarly, when the lightness is less than 9, the fine aggregate is conspicuous and has a low design property, which is not preferable.
Examples of the fine aggregate having such a color tone include fine aggregates containing high whiteness sand such as crystalline limestone and quartz sand. Here, examples of the crystalline limestone include white limestone (Kamsui stone). For example, Hitachi Hakusuiishi Co., Ltd. trade names “Hitachi Kousuiishi 4”, “Hitachi Kousuiishi 1”, Maeda Construction Materials Co., Ltd. ) Product name “Yamagata Silica No. 5” is used. Examples of the silica sand include “Yamagata Silica Sand No. 6” and “Yamagata Silica Sand No. 7”.
Among these fine aggregates, it is particularly preferable to contain 50% by mass or more of white limestone (cold stone) in the fine aggregate in terms of adjusting the color tone.

  The fine aggregate (B) used in the present invention is adjusted so as to contain 50% by mass or more of cryolite, and a plurality of commercially available fine aggregates are mixed to adjust the particle size distribution as described above. preferable.

  (B) The fine aggregate is preferably 230 to 360 parts by mass, more preferably 260 to 360 parts by mass, and more preferably 260 to 300 parts by mass with respect to 100 parts by mass of the white cement. When the blending amount of the fine aggregate is less than 230 parts by mass, the proportion of the white cement amount is too large, and the viscosity increases and the workability decreases. For this reason, a good finished pattern cannot be obtained, and an appropriate construction thickness cannot be obtained. In addition, the water cement ratio increases, drying shrinkage increases, and cracks may occur. When the amount of the fine aggregate exceeds 360 parts by mass, the workability of the iron is lowered and the roller construction becomes difficult. In addition, since the amount of white cement is reduced, the contour of the finished pattern becomes unclear, so that the design is also lowered.

In the present invention, (C) metakaolin is used as the pozzolanic substance. It is preferable to use a metakaolin that exhibits a saturation of 0.5 or less and a brightness of 9 or more in the Munsell color system from the viewpoint that the whiteness is high and the color tone of the finishing material is not lowered. The (C) metakaolin used in the present invention is preferably a fine powder having a specific surface area of 10000 cm ² / g or more that can improve the water tightness and improve the workability of the iron. Examples of such metakaolin include a trade name “Meta-Max HRM” manufactured by BASF Pozzolith Co., Ltd.

  (C) It is preferable to contain 3-5 mass parts of metakaolin with respect to 100 mass parts of (A) white cement. More preferably, it is 3.3-4.5 mass parts, More preferably, it is 3.3-4.0 mass parts. If it is less than 3 parts by mass, the effect of improving water tightness and iron workability cannot be obtained, and the effect of mixing is not recognized. If it exceeds 5 parts by mass, the water cement ratio increases and the water tightness decreases.

  As the hygroscopic clay mineral (D) used in the present invention, sepiolite and bentonite having an effect of improving iron workability are preferable, and commercially available ones can be used. Furthermore, the hygroscopic clay mineral is preferably one that exhibits a chroma of 0.5 or less and a brightness of 9 or more in the Munsell color system, considering that it is mixed with the finishing material and does not affect the aesthetics, like metakaolin. For example, sepiolite can be used under the trade name “IGS” manufactured by Sakai Kogyo Co., Ltd. Bentonite is mainly composed of the clay mineral montmorillonite, and silicate minerals such as quartz, α-cristobalite, opal, and feldspar, Slightly alkaline claystone accompanied by silicate minerals such as mica and zeolite, carbonate minerals such as calcite, dolomite, and dipsum, sulfate minerals, and sulfide minerals such as pyrite. “Haruna” can be used.

  The (D) hygroscopic clay mineral is preferably contained in an amount of 0.3 to 2.5 parts by mass with respect to 100 parts by mass of the (A) white cement. More preferably, it is 0.33-1.4 mass part, More preferably, it is 0.33-1.2 mass part. If it is less than 0.3 part by mass, the effect of improving the workability of the iron cannot be obtained, and there is no effect of mixing. When it exceeds 2.5 parts by mass, the viscosity increases and the water cement ratio increases. Therefore, there is a risk of cracking.

  (E) The silane water repellent is useful for imparting antifouling properties, frost damage resistance, and salt damage resistance to a finishing material. As the (E) silane water repellent used in the present invention, a silane compound which is mixed with cement mortar and becomes reactive silanol under high alkaline conditions is preferable. For example, organic silane, polysilane and the like. Specific examples include trade name “Seal 80” manufactured by Akzo Nobel Co., Ltd. The surface of reactive silanol is modified to be hydrophobic by crosslinking between silanol groups or reaction with an inorganic compound. Therefore, the silane water repellent has good kneading properties, and the highly durable finish of the present invention exhibits excellent water repellency after curing.

  (E) It is preferable to contain 0.07-0.70 mass parts of silane water repellents with respect to 100 mass parts of (A) white cement. More preferably, it is 0.16-0.68 mass part, More preferably, it is 0.16-0.60 mass part. If it is less than 0.07 parts by mass, appropriate water repellency cannot be obtained, and there is no effect of mixing. Even if it exceeds 0.70 parts by mass, the improvement of the water repellent effect is small and uneconomical.

  (F) The polymer exhibits effects such as antifouling property, frost damage resistance, salt damage resistance, neutralization inhibitory property, etc. on the finishing material when used in combination with a water repellent and metakaolin. As the polymer (F) used in the present invention, a polymer dispersion and a re-emulsifying powder resin can be used. As the polymer dispersion, those specified in JIS A6203 can be used, and as the re-emulsifying powder resin, those specified in JIS A6203 can also be used. That is, as the polymer dispersion, a resin mainly composed of polyacrylic acid ester, styrene butadiene, ethylene vinyl acetate, or the like can be used. In addition, as the re-emulsification type powder resin, a powdered resin mainly composed of polyacrylic acid ester, ethylene vinyl acetate, vinyl acetate / vinyl versatate, vinyl acetate / vinyl versatate / acrylic acid ester, etc. is used. can do. Moreover, the manufacturing method of re-emulsification type | mold powder resin is not limited, You may manufacture by any manufacturing methods, such as the pulverization method and the blocking prevention method.

  (F) The polymer preferably contains 3 to 17 parts by mass, more preferably 4 to 15 parts by mass, in terms of solid content, with respect to 100 parts by mass of (A) white cement. More preferably, 6-15 mass parts is good. If the amount is less than 3 parts by mass, there is no effect of reducing water absorption. If the amount exceeds 17 parts by mass, the viscosity increases and the workability decreases.

  Furthermore, (G) expansion | swelling material, (H) water retention agent, (I) antifoamer, a coloring material, etc. can be mix | blended with the highly durable finishing material of this invention.

(G) The expansion material has the effect of improving the crack resistance of the finishing material. A commercially available expansion material can be used as the expansion material, and both a lime-based expansion material and an ettringite-based expansion material can be used. For example, trade names “Pacific Expan (for structure)”, “Pacific Gypcal” manufactured by Taiheiyo Material Co., Ltd. and the like can be mentioned.
(G) It is preferable to contain 2-6 mass parts of expansion | swelling materials with respect to 100 mass parts of (A) white cement. More preferably, it is 3.3-5.5 mass parts, More preferably, it is 4.0-4.8 mass parts. (G) When there is too little content of an expansion | swelling material, there will be no mixed effect and a crack reduction effect will not be acquired. On the other hand, if the amount is too large, abnormal expansion may occur after construction, and peeling or peeling may occur. In addition, after construction in the cold season, there is a risk of delayed expansion and peeling or peeling.

(H) As a water retention agent, a cellulose derivative can be used. Any water-soluble cellulose derivatives such as methyl cellulose, carboxymethyl cellulose, hydroxypropyl methyl cellulose, hydroxyethyl cellulose, hydroxyethyl methyl cellulose, hydroxypropyl cellulose, cellulose sulfate and the like can be used. Of these, methylcellulose, hydroxypropylmethylcellulose, and hydroxyethylmethylcellulose are preferred.
(H) It is preferable to contain 0.1-0.25 mass part of water retention agents with respect to 100 mass parts of (A) white cement. More preferably, it is 0.11-0.18 mass part. (H) When there is too little content of a water retention agent, appropriate water retention performance will not be obtained. On the other hand, when the amount is too large, the viscosity is increased too much, the workability is lowered, the setting time is extended, and the strength development is lowered.

(I) Although a polyether type and a silicone type can be used for an antifoamer, the powdery thing which can be mixed with premix mortar from the time of manufacture is preferable. For example, trade names “SN deformer AHP”, “SN deformer 14HP” manufactured by San Nopco Corporation are preferable.
(I) It is preferable to contain a defoamer 0.03-0.15 mass part with respect to 100 mass parts of (A) white cement. More preferably, it is 0.08-0.12 mass part. If the content of the antifoaming agent is too small, a sufficient antifoaming effect cannot be obtained, and air entrained when the highly durable finish of the present invention is kneaded remains, leading to a decrease in strength and a decrease in water tightness. On the other hand, too much is uneconomical because almost no improvement in the defoaming effect is obtained.

  The highly durable finishing material of the present invention can be applied by mixing water with the above components and applying the mixture to the outer wall or the like. Targets include detached houses, apartment houses, outer walls of public buildings, artificial trees, and artificial stones. Examples of construction means include spray construction, roller construction, gold trowel construction, and wood trowel. Further, examples of the finishing means for the outer wall include scraping finish, plaster finish, and wooden finish. Also, various patterns such as combs and sculptures can be given to the finished surface.

  Moreover, it is suitable for the highly durable finishing material of this invention to mix the said component previously, and to make it the premix type used by mixing with water at a construction site. In addition, when making it a premix type, it is preferable to use an antifoamer and a polymer in a powder form.

  EXAMPLES Next, although an Example is given and this invention is demonstrated in detail, this invention is not limited to these Examples at all.

Examples 1-12 and Comparative Examples 1-20
A highly durable finish was obtained with the formulations shown in Tables 9-13. In addition, when the component was powder, it was set as the premix type. Finishing construction was performed by mixing with water and emulsion listed in the table, and the performance was evaluated. The results are shown in Tables 9 to 13.

<Confirmation of fresh properties>
1-1. Flow test Measured according to JIS R5201 in a 20 ° C test room.
1-2. Measurement of unit volume mass It measured by JISA1171 in a 20 degreeC test room using a 500 mL stainless steel container.

<Performance evaluation method>
2-1. Formability evaluation test In a test room at 20 ° C., whether spraying, roller construction, gold trowel construction, scraping finish, or plaster finish is possible was confirmed by constructing a 450 × 600 × 60 mm concrete plate with a thickness of 5 mm. In addition, the spray construction used a ricin gun, and the roller construction produced the 210 mm width roller from which the 7 mm width comb pattern was obtained, and confirmed workability. For the gold trowel finish, a 7 mm comb trowel was used. The evaluation criteria are as shown in Table 1.

[Formability evaluation results]
Table 2 shows the overall evaluation criteria for the design of the present invention.

2-2. Length change test According to JISA 1171, the length change rate of 28 days was measured. Evaluation items are shown in Table 3.

2-3. Antifouling test and evaluation of finished color In a 20 ° C. test room, two 150 × 300 × 5 mm flexible boards were smoothly applied to a thickness of 5 mm with a gold trowel. After curing for 3 weeks, the color tone of one of them was confirmed by Munsell value.
A sample having a saturation of 0.5 or less and a lightness of 9 or more was evaluated as “◯”.
A case where the saturation exceeds 0.5 and the brightness is less than 9 was evaluated as “x”.
Thereafter, one sheet was sealed with a five-sided epoxy resin, and in the fourth week, the exposure test was started with the south side facing upright. The exposure period was 3 months, and the color difference ΔE * ab from the test specimen that was not exposed was measured with a color difference meter. Evaluation items are as shown in Table 4.

2-4. Water absorption test According to JISA 1171, the amount of water absorption for 24 hours was measured in a test chamber at 20 ° C. The evaluation criteria are as shown in Table 5.

2-5. Freeze-thaw test A 100 x 100 x 400 mm mold was used and cured in a test room at 20 ° C for 4 weeks according to JISA 1171, and then immersed in water at 20 ° C for 24 hours to start the test. The freeze-thaw test was performed 300 cycles according to JISA1148. The test body was set to n = 1 in consideration of the test period and the test level. Freeze-thaw resistance was evaluated according to the relative kinematic modulus and Table 6.

2-6. Bending / compression test In accordance with JISA 1171, the test was performed in a 20 ° C. test room. The size of the specimen was 40 × 40 × 160 mm and the age was 28 days. The compressive strength test was carried out with n = 6 using the specimen for which the bending strength test was completed.

  Table 7 shows the materials used. The Munsell values in Table 7 are tones according to the Munsell color system, N is lightness, R is red, and Y is yellow. The number after the slash indicates saturation.

  Table 8 shows the particle size of the silica sand.

  As is clear from Tables 9 to 13, the highly durable finish material of the present invention has a good finished color, excellent formability and workability, and good antifouling properties, freeze-thaw resistance, and water resistance. . On the other hand, the finishing material not containing any of the components (A) to (F) of the present invention was inferior in any of these evaluations. In Tables 11 to 13, Comparative Examples 19 and 20 contain a large amount of silica sand 9 and therefore do not satisfy the condition of the particle size of the component (A) of the present invention.

Claims (7)

(A) 100 parts by weight of white cement,
(B) Density of 2.0 g / cm ³ or more, particle size of 600 μm or more and less than 2500 μm is 35 to 50% by mass, particle size of 300 to 600 μm is 30 to 45% by mass, and particle size of less than 300 μm is 25% by mass or less. Composed of 230 to 360 parts by mass of fine aggregate,
(C) 3-5 parts by mass of metakaolin,
(D) 0.3 to 2.5 parts by mass of a hygroscopic clay mineral,
(E) Silane water repellent 0.07 to 0.70 parts by mass and (F) 3 to 17 parts by mass of polymer in terms of solid content,
(B) and (D) both exhibit a saturation of 0.5 or less and a brightness of 9 or more in the Munsell color system.   (D) The highly durable finish according to claim 1, wherein the hygroscopic clay mineral is sepiolite or bentonite having a chroma of 0.5 or less and a brightness of 9 or more in the Munsell color system.   (B) The highly durable finishing material according to claim 1 or 2, wherein the fine aggregate contains 50% by mass or more of cold water stone.   Furthermore, the highly durable finishing material in any one of Claims 1-3 containing an expansion material (G).   Furthermore, (H) The highly durable finishing material in any one of Claims 1-4 containing a water retention agent.   Furthermore, (I) The highly durable finishing material in any one of Claims 1-5 containing an antifoamer.   The high durability finishing material according to claim 1, which is a premixed high durability finishing material.