JP2006241959A - Slaked lime powder or cream as wall construction material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide lime cream as a wall construction material with good workability in wall plaster work using a trowel, with little fear of cracking after the work execution, the material also having moisture adjustment function, and bacteria and mold resistant performance. <P>SOLUTION: The slaked lime powder producing this slaked lime powder used for wall construction and excellent in finish plastering work has the following characteristics: (1) The grain distribution is 1% or less if the fineness residual amount is 590 μm or more, and 15% or less if the fineness residual amount is 88 μm or more, and the part in which the grain diameter is 10 μm or more amounts 5 to 35% of the total slaked lime powder. Further an inequality of 3(d<SB>50</SB>)≥(d<SB>90</SB>) is effective. (2) The specific surface area is 20 m<SP>2</SP>/g or less. (3) The total pore capacity is 0.1 cm<SP>3</SP>/g or less, and the capacity of pores with a diameter of 100 to 400 Å is 0.08 cm<SP>3</SP>/g or less. The moisture adjustment function is provided by adding a porous material to the lime slaked lime powder, and the bacteria and mold resistant performance is provided by adding antibacterial or mold preventive substances respectively. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

The present invention relates to slaked lime for preparing a topcoat material among plastered slaked lime used as a material for a plaster wall, and improvement of lime cream using the slaked lime. According to the present invention, it is not necessary to worry about the occurrence of cracks, and a top coating material with good workability is provided.

JIS-A6902 "Slime for plastering" is a slaked lime used as "for top coating" with (CaO + MgO) of 65% or more, carbonic acid of 15% or less, a residual powderiness of 590 μm or more, 1% or less, and 88 μm or more. % Or less, and the hardness coefficient and stability test are defined. However, the actual particle size distribution varies depending on the product of each manufacturer. In general, a cream made by adding water to slaked lime improves the workability when the particle size is fine, but the water content inevitably increases, so that cracking due to shrinkage tends to occur after construction. In order to prevent this, pastes, aggregates, fibers, and the like are added, but there is a dilemma that when these additives are added in large quantities, workability is inevitably lowered.

As an effort to improve workability and prevent cracking of the plaster, the material (Patent Document 1) that forms an elastic plaster using an elastic resin emulsion and a composition that gives a polished plaster-like wall material (Patent Document 2) Disclosure is included. These are efforts to find the optimum one by devising the composition and composition of inorganic substances such as slaked lime, dolomite and calcium carbonate, and organic substances such as methylcellulose.

Many attempts have been made to add humidity control to the walls. For example, there is a building material (Patent Document 3) that recommends a building material having a large specific surface area and pore volume (Patent Document 3), but it is a technique for producing a solidified body by baking or autoclave treatment, rather than applying a cream. As for the coating, an alkali metal halide is added to limestone and fired at a high temperature in a reducing atmosphere, and the powder obtained by pulverizing the obtained small block reduced salt calcined lime is digested with water mixed with an inorganic porous material. A lime cream was proposed (Patent Document 4). There is also a material having a high moisture permeability by adding diatomaceous earth (Patent Document 5). Examples of a deodorizing and antifouling effect include a finishing material in which a tetravalent metal phosphate and a divalent metal hydroxide and a titanium oxide catalyst are mixed (Patent Document 6). For absorption of formaldehyde, it has been proposed to add sepiolite powder to slaked lime or dolomite plaster (Patent Document 7).

In addition, calcium-nitrilotriethanol was introduced as a substance useful as a water reducing agent for cement and plastering materials and having an antibacterial action (Patent Document 8).
JP-A-4-68155 JP 2001-192255 A JP-A-9-137516 Japanese Patent No. 3520266 Japanese Patent No. 3220951 JP-A-11-264224 JP 2001-72458 A JP 2003-104943 A

The inventors have made the above-mentioned prior intent with the aim of satisfying the basic requirement of improving the operability but preventing cracking of the slaked lime powder or lime cream for wall materials used for the top coating of stucco work. The selection of physical properties of slaked lime itself, which is not mentioned in any technical literature, was reviewed and appropriate ones were sought. As a result, it was found that a specific particle size, specific surface area and pore volume should be selected.

The basic object of the present invention is to provide a lime cream for wall material based on such knowledge obtained by the inventors, which has good workability even with a relatively small amount of additive and is less likely to crack after construction. It is providing the slaked lime powder to give, and the lime cream for wall materials using the same. One incidental object of the present invention is to provide a slaked lime powder or a lime cream for wall material that can achieve the above basic object, and capable of constructing a wall material having a humidity control function. It is in. Another ancillary object of the present invention is that a wall material having antibacterial and antifungal properties is applied to slaked lime powder or lime cream for wall material that achieves the above basic object or further ancillary object. It is to provide what can be done.

The slaked lime powder that achieves the above basic object and provides the lime lime cream for wall material with excellent top coatability of the present invention has the following characteristics.
1) The particle size distribution is 1% or less when the remaining fineness of 590 μm or more is 15% or less when 88 μm or more, and the portion having a particle size of 10 μm or more occupies 5 to 35%, and 3 (d ₅₀ ) ≧ (d ₉₀ ) (here, “d ₅₀ ” means the total particle size of 50% by weight, and “d ₉₀ ” also means the 90% particle size of the powder).
2) The specific surface area is 20 m ² / g or less, and 3) The pore volume is 0.1 cm ³ / g or less, and the pore volume of 100 to 400 mm in diameter is 0.08 cm ^3. / G or less.

The wall material lime powder capable of constructing the wall material having the humidity control function of the present invention, which achieves one incidental object, is the above slaked lime powder for wall material, kaolinite clay mineral, halloysite clay A powder of one or more porous materials selected from minerals, waste materials of calcium silicate building materials, activated carbon, charcoal and bamboo charcoal is added at a ratio of 30 parts by weight or less to 100 parts by weight of slaked lime. .

The wall material lime powder capable of constructing the wall material having the antibacterial function and / or fungicidal function of the present invention, which achieves one additional purpose, is the above-mentioned slaked lime powder or wall material for a wall material. The following antibacterial agents and / or fungicides are added to lime.
1) One or more antibacterial agents selected from silver-based antibacterial agents, boron compounds, iodine compounds, hinokitiol, catechin, chitosan, capsaicin and calcium nitrile triethanol, and 2) benzimidazole antifungal agents, N- One or more antifungal agents selected from haloalkylthio fungicides, nitrile fungicides, pyridine fungicides and N-fluoroalkylthio fungicides.

Since the slaked lime powder of the present invention has the specific particle size, specific surface area and pore volume described above, the lime cream prepared from this has good workability in the ironing operation as seen in the examples described later. Moreover, no cracks occur after construction. The lime cream from the slaked lime powder provided with the humidity control function ensures the workability and the effect of preventing cracks, and the walls obtained by the construction have the desired humidity control function. As used herein, “humidity control” as used herein refers not only to adjusting the humidity in the room, but also to the ability to adsorb and remove harmful or odorous components present in the air. It has a wide meaning including. Furthermore, the lime cream from slaked lime powder that has been given antibacterial and / or fungicidal functions also ensures good workability and the effect of preventing cracks, and the walls obtained by construction are the intended ones. Has antibacterial and / or antifungal functions.

The reason why the slaked lime powder of the present invention should have the above-mentioned characteristics is as follows. Needless to say, the particle size distribution is determined by JIS as follows. “Parts having a particle size of 10 μm or more occupy 5 to 35%” and “3 (d ₅₀ ) ≧ (d ₉₀ )” indicate that the distribution width of the particle size is within a certain range, It means that there are no large particles that form aggregates. Aggregates are not preferred because they cause cracks after applying the wall material.

Next, “a specific surface area of 20 m ² / g or less” is a necessary condition for avoiding cracks and peeling during drying. Slaked lime having a specific surface area of more than 20 m ² / g is inappropriate in that it tends to cause cracking and peeling because of its high water content and low water retention.

And on the pore volume, "the total volume is less than 0.1cm ³ / g, a pore volume of diameter 100~400Å, 0.08cm ³ / g or less" condition that also, avoid cracking and peeling at the time of drying Above is something to satisfy. As the pore volume increases, the amount of water absorption increases and the water retention decreases, and cracking and peeling during drying tend to occur. Also, the larger the pore volume, the greater the amount of gas adsorption and the faster the adsorption rate (this phenomenon has been demonstrated for hydrogen sulfide). Since this gas adsorption is thought to involve pores with a diameter of 100 to 400 mm, the volume of such pores was limited.

Slaked lime having the above characteristics can be easily produced by a conventional slaked lime production process of (production of quick lime by calcining limestone) → (digestion of quick lime). At this time, it is preferable to add water several times or more, particularly 4.5 times or more of the theoretical amount of water, to carry out the hydration reaction in order to obtain appropriate slaked lime.

Kaolinite clay minerals, halloysite clay minerals, waste materials of calcium silicate building materials, activated carbon, charcoal and bamboo charcoal mentioned as porous materials are added to slaked lime by adding one or more selected from them to slaked lime It is possible to construct a wall material having a humidity control function superior to that of a single case. The effect of adding the porous material is surely obtained when it is 5 parts by weight or more with respect to 100 parts by weight of slaked lime. On the other hand, since these porous materials have a negative effect on the workability of lime cream, they cannot be added in a large amount. In practice, 30 parts by weight is the limit for 100 parts by weight of slaked lime.

Known as an antibacterial agent, the above-mentioned silver-based antibacterial agent, boron compound, iodine compound, hinokitiol, catechin, chitosan, capsaicin, and calcium nitrile triethanol are used for the above wall material. By adding to slaked lime powder or lime for wall material, a wall material having an antibacterial function can be constructed. The appropriate amount used varies greatly depending on the type of antibacterial agent, but is approximately 5 parts by weight or less, and in many cases, 1 part by weight or less with respect to 100 parts by weight of slaked lime.

Construction of a wall material having an antifungal function by adding one or more selected from the above-mentioned compounds, known as an antifungal agent, to the above slaked lime powder for wall materials or lime for wall materials Can do. A typical example is as follows.
1) benzimidazole series “TBZ”: 2- (4-thioazolyl) -benzimidazole 2) N-haloalkylthio series “captan”: N- (trichloromethylthio) -4-cyclohexyl luro-1,2-dicarboxamide “fluorophore” “Pet”: N-fluorodichloromethylthio-phthalimide 3) Nitrile system “Chlorothalonyl”: 2,4,5,6-tetrachloroisophthalonitrile 4) Pyridine system “Methylsulfonyltetrachloropyridine”: 2, 3, 5, 6 -Tetrachloro-4- (methylsulfonyl) pyridine The appropriate amount used varies depending on the type of fungicides, but in the same way as the antibacterial agent, approximately 5 parts by weight or less, in many cases, with respect to 100 parts by weight of slaked lime. Is in the range of 1 part by weight or less. Usually, about 0.1 to 0.4 parts by weight is optimal.

The lime cream for wall material of the present invention can be prepared by adding a suitable amount of water and conventional additives to the slaked lime powder or quick lime powder for wall material described so far, and the preparation thereof. May be performed according to known techniques. “Regular additives” include cellulose derivatives such as methylcellulose, hydroxypropylmethylcellulose, carboxymethylcellulose, emulsions such as acrylic emulsions, ethylene vinyl acetate emulsions, vinyl acetate emulsions, and dispersants. Appropriate aggregates are added to this accordingly. Their usage and addition method are also known. If it is more convenient, first prepare a cream containing water or some moisture conditioner or antibacterial / antifungal agent together with slaked lime, and add the remaining ingredients to complete the composition. Of course, you may follow the procedure of doing.

The calcined lime with 3.2% residual CO ₂ obtained by calcining limestone produced by Kuzu in Tochigi Prefecture was pulverized to a particle size of 150 μm or less and digested under the conditions shown in Table 1 to produce slaked lime powder.

参照例として、ＪＩＳＡ６９０２に定める左官用消石灰も用意した。 Table 1

As a reference example, plastering slaked lime as defined in JIS A6902 was also prepared.

The results shown in Table 2 were obtained by examining the particle size, specific surface area and pore volume of the slaked lime obtained or prepared as described above.

Table 2

For the above slaked lime, when the temperature reached 50 to 90 ° C. during the digestion process, the additives shown in Table 2 were added, and for the plastering slaked lime, the additives shown in Table 3 were added. Later, 80 parts by weight of water was added to produce 5 types of lime cream.

In Table 3, the notes have the following meanings.
^{* 1} 25% solids
^{* 2} Acrylic resin emulsion (resin content 50%)
^{* 3} Hydroxypropyl methylcellulose powder (2% solution viscosity about 4000 cp)
The digested water of Comparative Example 2 is a solution in which 0.5% sucrose is dissolved.
Table 3

Four kinds of prepared lime creams were overcoated on a gypsum test board to a thickness of 1 mm, and the water was pulled and pressed with a trowel. The overcoated test board was dried at a temperature of 23 ° C. and a humidity of 50%, and the surface hardness was measured at the age of 1 week and 4 weeks. In order to investigate workability, the above-mentioned lime cream was overcoated on another gypsum boat to a thickness of 1 mm, and the work conditions at that time were evaluated in terms of the following points.
Iron elongation, smoothness of coated surface: Good ○ Normal △ Inferior ×
Iron stickiness: Less ○ Normal △ More ×
Crack after drying: No Yes Yes
Table 4 shows the surface hardness and workability.

Table 4

As Example 2, a wall material containing a porous material was prepared as follows. That is, a mixture of 100 parts by weight of quick lime pulverized to a particle size of 150 μm or less and 20 parts by weight of halloysite clay mineral similarly pulverized to a particle size of 150 μm or less was digested by adding 200 parts by weight of water, and the temperature was 50 to 90 ° C. At that time, 1.9 parts by weight of HPMC powder with respect to 100 parts by weight of slaked lime, 0.8 parts by weight of a dispersant, and 0.8 parts by weight of acrylic (as described above) were added to obtain a lime cream.

The surface of a 10 cm square gypsum board is coated with the lime cream of Example 1 or the lime cream of Example 2 so that each solid content is 5 g, in an environment of a temperature of 23 ° C. and a humidity of 50% RH. Then, the test piece was made by setting the surroundings with an epoxy resin for 5 days and then standing for 2 days, and then the adsorption performance of formaldehyde and hydrogen sulfide was measured.

[Test method]
Put the test specimen in 5L Tetra Pak, replace the inside of Tetra Pak with 5L of air containing 100ppm formaldehyde and 20ppm hydrogen sulfide, and after 1 hour and 5 hours have passed, collect the air in Tetra Pak with a detector tube, And the concentration of H ₂ S was measured. As a reference, a blank containing no test specimen was prepared, and the relative value was recorded. The results are shown in Table 5 together with the results of the tests performed on the reference examples.

Table 5

As Example 3, what prepared 1% boric acid added to the lime cream of Example 1 was prepared, and the antibacterial performance was measured. The measurement was performed according to the MIC (Minimum Growth Inhibitory Concentration) measurement method (agar plate dilution method) defined by the Japan Society for Scientific and Medical Law. The lowest antibacterial additive concentration at which no growth of bacteria is observed is defined as MIC. Table 6 shows the results obtained by measuring Example 3, Example 1 and the reference example for Escherichia coli and Staphylococcus aureus.

消石灰はアルカリ性であるから、もともと抗菌作用をもっているが、抗菌・防かび剤の添加により、それが強化されたことがわかる。 Table 6

Since slaked lime is alkaline, it originally has antibacterial action, but it can be seen that it has been strengthened by the addition of antibacterial and antifungal agents.

Claims (4)

Slaked lime powder that gives the lime cream for wall materials having the following characteristics and excellent top coatability:
1) The particle size distribution is 1% or less when the remaining fineness of 590 μm or more is 15% or less when 88 μm or more, and the portion having a particle size of 10 μm or more occupies 5 to 35%, and 3 (d ₅₀ ) ≧ (d ₉₀ ) (where “d ₅₀ ” means the total particle size of 50% by weight, and “d ₉₀ ” also means the 90% powder particle size).
2) The specific surface area is 20 m ² / g or less, and 3) The pore volume is 0.1 cm ³ / g or less, and the pore volume of 100 to 400 mm in diameter is 0.08 cm ^3. / G or less. The slaked lime powder for wall material according to claim 1 is made of one or more porous materials selected from kaolinite clay mineral, halloysite clay mineral, calcium silicate building material waste, activated carbon, charcoal and bamboo charcoal. The lime powder for wall materials which adds a powder in the ratio of 30 weight part or less with respect to 100 weight part of slaked lime, and can construct the wall material which has a humidity control function. The following antibacterial agent and / or fungicidal agent is added to the slaked lime powder for wall material according to claim 1 or the lime for wall material according to claim 2 to provide antibacterial function and / or fungicidal agent. Lime powder for wall materials that can be used to construct wall materials with functions:
1) One or more antibacterial agents selected from silver-based antibacterial agents, boron compounds, iodine compounds, hinokitiol, catechin, chitosan, capsaicin and calcium nitrile triethanol, and 2) benzimidazole antifungal agents, N- One or more antifungal agents selected from haloalkylthio fungicides, nitrile fungicides and pyridine fungicides. A lime cream for wall material obtained by adding an appropriate amount of water and a common additive to the slaked lime powder for wall material described in claim 1 or the lime powder for wall material described in claim 2 or 3 to make a cream.