JP2013189365A - Composition for building material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an appropriate composition for a building material which is made from raw materials to form a finished layer for an interior wall such as a gypsum board, plywood, reinforced concrete, a concrete block and brick, excels especially in troweling workability without skill, and gives a finished layer that has a tint efficiently and freely changed, excels in feeling, texture, touch or the like and in a humidity control function, viscous strength, and antimicrobial/antifungus ability, and prevents cracks, surface collapse, separation, peeling or the like.SOLUTION: There are provided, (1) a composition for a building material including slaked lime of 3-60 w% and clay of 97-30 w%, (2) the composition for a building material of (1) using as the slaked lime salt-baked slaked lime with salt added and as the clay off-white powder-based American clay without any chemical substance, and (3) a method of producing the composition for a building material characterized by blending the salt-baked slaked lime of 3-60 w% and the American clay of 97-40 w%, adding water of 50 w% to a mixture of the salt-baked slaked lime and the American clay of 100 w% and mixing them.

Description

  The present invention is a raw material for forming finishing layers such as interior walls such as gypsum board, plywood, reinforced concrete, concrete blocks, bricks, etc., and is particularly excellent in ironing workability. The finish layer is excellent in humidity control function and strength viscosity, preventing cracks, cracking the surface, separating and peeling, etc. Further, the present invention relates to a composition for building materials which is excellent in antibacterial and antifungal performance.

For the purpose of maintaining a bright room, preventing dust generation, preventing mold, preventing discoloration, and preventing condensation, the interior wall of a building generally employs a plaster-like wall composition as a composition for the building material.
The plaster-like wall composition was used as “for top coating” by JIS-A6902 “Slime for plasterers”.
For slaked lime, (CaO + MgO) is 65% or more, carbonic acid is 15% or less, the remaining fineness of 590 μm or more is defined as 1% or less, and 88 μm or more is defined as 15% 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, cream made by adding water to slaked lime improves the workability when the particle size becomes fine, but the water content increases, so that cracking due to shrinkage tends to occur after construction.

In order to prevent these problems, paste, aggregate, fiber, and the like are added. However, when these additives are used in large quantities, workability is unavoidably reduced.
In order to improve workability and prevent cracks in plaster, materials that form elastic plaster using an elastic resin emulsion and compositions that provide polished plaster-like wall materials can be used.
These compositions involve the complexity that must be determined in consideration of 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 provide humidity control on the walls. For example, some building materials with a large specific surface area and pore volume are recommended, but this is not a technique for applying a cream, but a technique for producing a solidified body by baking or autoclaving.
For coating, the powder obtained by adding alkali metal halide to limestone and firing at high temperature in a reducing atmosphere, and pulverizing the obtained small block reduced salt calcined quicklime is digested with water mixed with an inorganic porous material. There is lime cream. In addition, diatomaceous earth is added to make a highly permeable finish.
A product that aims at deodorizing and antifouling is a finishing material in which a tetravalent metal phosphate and a divalent metal hydroxide, or a titanium oxide catalyst are mixed. For absorption of formaldehyde, it has been proposed to add sepiolite powder to slaked lime or dolomite plaster. In addition, calcium-nitrilotriethanol has been introduced as a substance that is useful as a water reducing agent for cement and plastering materials and has an antibacterial action.

Therefore, slaked lime powder having a humidity control function, antibacterial / antifungal performance, and crack prevention function, and limiting the optimum particle size, specific surface area and pore volume of slaked lime has been developed to improve workability.
The feature of this slaked lime powder is that the particle size distribution of the slaked lime powder is 1% or less when the residual fineness of 590 μm or more, 15% or less of 88 μm or more, and the portion with a particle size of 10 μm or more occupies 5 to 35%, 3 (d50) ≧ (d90). (Here, “d50” means the particle size of the powder of 50% in total and “d90” also means the particle size of the powder of 90%.), The specific surface area is 20 m 2 / g or less, and 3) The total 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.
In order to obtain a humidity control function, a powder of one or more porous materials selected from kaolinite clay mineral, halloysite clay mineral, calcium silicate-based building materials, activated carbon, charcoal and bamboo charcoal is added to this slaked lime powder. And 30 parts by weight or less with respect to 100 parts by weight of slaked lime.
Silver antibacterial agents, boron compounds, iodine compounds, hinokitiol, catechin, chitosan, capsaicin, calcium nitrile triethanol and the like are added as antibacterial agents.
Further, benzimidazole antifungal agents, N-haloalkylthio antifungal agents, nitrile antifungal agents, pyridine antifungal agents, N-fluoroalkylthio antifungal agents and the like are added as antifungal agents.

As described above, all of the conventional plaster-like wall compositions require many raw materials, and are complicated, costly and bulky, requiring a great deal of labor and time for their production.
The present invention solves this problem, realizes simple manufacturing and cost reduction using a small variety of raw materials, and is particularly excellent in troweling workability without requiring skill only in troweling work. Excellent workability and efficient change of color freely, and finishes well in texture, texture and texture, etc. The finished wall is excellent in humidity control function and strength viscosity, prevents cracking, breaks down and separates In addition, the present invention provides a suitable composition for building materials that prevents peeling and the like, and is excellent in antibacterial and antifungal performance.

The composition for building materials and the method for producing the same as the features of the present invention that solve the above-mentioned problems are as follows (1) and (3).
(1) A composition for building materials, containing slaked lime and clay, having a slaked lime content of 3 to 60 w% and a clay content of 97 to 40 w%.
(2) The composition for building materials according to the above (1), characterized in that an off-white powder containing no chemical substance is used as a clay, and an American clay is used as a clay. object.
(3) The salt-burned lime and the American clay are blended, the blending ratio of the salt-burned lime is 3-60 w%, the blending ratio of the American clay is 97-40 w%, and the blend of the salt-burned lime and American clay is 100 w%. 50% by weight of water is added to and mixed with the method for producing the building material composition.

  The composition for building materials according to the present invention and its manufacturing method achieve simple manufacturing and cost reduction using a small number of raw materials, and are particularly excellent in troweling workability, requiring skill only in the troweling operation. It has excellent workability and efficiency, and the color can be changed freely and the finish, texture and texture are also excellent, and the finished wall has excellent humidity control function and strength viscosity, prevents cracks and breaks the surface. In addition, it prevents separation, peeling, etc., and is excellent in antibacterial and antifungal properties, and further, has no discoloration, and realizes a long life with extremely little deterioration over time.

  The configuration of the embodiment for carrying out the present invention, the definition of the configuration, the significance of the configuration, the effects and the like will be described.

  In the present invention, slaked lime refers to a component having a component structure of calcium hydroxide Ca (OH) 2 and a crystal structure of a hexagonal flat plate or prism.

  In the present invention, salt-calcined lime refers to the addition of an appropriate amount of salt, and when calcined at about 1,000 ° C. using coke fuel, carbon dioxide gas in the limestone is released to form quick lime, and digestion when an appropriate amount of water is added. Causes slaked lime. When finely divided into fine grains, the crystal grains are fine, uniform and stable, and slaked lime with minimal or no metal impurities. The component composition is calcium hydroxide Ca (OH) 2, and the crystal structure is hexagonal. A thing that is a flat plate or prism shape of the system.

  In the present invention, “clay” refers to a component having a calcium carbonate-mixed clay system.

  In the present invention, the American clay is preferably an American clay based on off-white powder that does not contain any chemical substance, and the component composition is a clay system containing calcium carbonate.

1) Significance of slaked lime in the building material composition containing slaked lime and clay of the present invention.
Slaked lime is preferably added with an appropriate amount of salt and calcined at about 1,000 ° C. using coke fuel to release carbon dioxide in limestone to form quick lime, and when an appropriate amount of water is added, it causes a digestion reaction and slaked lime. I can do it. Finely divided fine powder is used to make fine, uniform, stable, and salt-calcined lime with minimal or no metal impurities, used as a binder and for strength improvement and for changing shade adjustment of white level. In order to prevent cracking, surface breakage, separation, peeling, and the like, the blending ratio with clay is 3 to 60% by weight in order to obtain sufficient caking properties and strength. In other words, when the salt-calcined lime is less than 3 w%, the strength is lowered, and when it exceeds 60 w%, the caking property is lowered, and there are problems of discoloration due to the occurrence of dirt when the ground is dirty, problems of odor generation and collapse, etc. This is not preferable because the effect of blending the American clay mentioned below cannot be sufficiently obtained.

2) Significance of clay in the building material composition containing slaked lime and clay of the present invention.
The clay is preferably an off-white powder based American Clay, which contains no chemicals, and it is antibacterial due to its alkalinity while maintaining humidity control and deodorizing effects for changing the hue and maintaining a comfortable indoor humidity.・ To obtain fungicidal effect and to prevent discoloration, and to obtain anti-fouling effect by preventing static electricity. To obtain these, the blending ratio with salt-fired lime is set to 97-40w%. .
That is, when the blending ratio of American clay exceeds 97 w%, the effect of the salt-burned slaked lime cannot be obtained sufficiently. Moreover, when the blending ratio of American clay is less than 40 w%, the odor of slaked lime becomes strong and the function as an interior coating wall material is deteriorated.

3) In the manufacturing method of the composition for building materials, the salt-burned lime and the American clay are blended, the blending ratio of the salt-burning lime is 3-60 w%, the blending ratio of the American clay is 97-40 w%, and the salt-burning lime Significance of adding 50 w% of water to 100 w% of a blend of American clay and American clay.
The significance of blending the salt-burned slaked lime with the American clay is as described above.
The blending of the water with respect to the salt slaked lime and the American clay is necessary in order to maintain the wall workability satisfactorily, and by adding 50 w% of water to the blend of the salt slaked lime and American clay with 100 w% and mixing. The troweling workability is improved, the efficiency of the workability is remarkably increased, and the texture, texture, and touch are finished well, and the finished wall has sufficient strength and viscosity.
In other words, if the water content is less than 40 w% and more than 65 w%, the troweling workability is deteriorated and it is difficult to obtain a wall having a desired thickness. In addition, texture, texture, and touch are also deteriorated. Furthermore, sufficient strength and viscosity cannot be obtained.
Further, as a solution for the above-mentioned problem of discoloration due to the occurrence of contamination that occurs due to soiling of the ground, it is preferable to thinly apply American clay only as a pretreatment on the surface of the ground.

Table 1 introduces practical examples of the present invention.
Nos. 1 to 12 are preferable blending examples, and Nos. 13 to 19 are comparative examples.
In Table 1, the mixing ratio of water at the time of manufacture is the mixing ratio Wt% with respect to 100% by weight of American clay and salt-burned lime.
As is apparent from Table 1, the building material compositions of Nos. 1 to 12 each have a preferable content, and the desired effect was obtained. On the other hand, the comparative examples of Nos. 13 to 19 were examples that exceeded the preferred range, and in all cases, only a low effect was obtained.
As for the humidity function of the effect, the humidity function of humidity control building materials generally adjusts the humidity of the room by absorbing moisture when the indoor humidity is excessive and dehumidifying the room air when it is dry. It also refers to the function of not releasing air pollutants into the room and the function of reducing indoor air pollutants by the adsorption of air pollutants.
Therefore, the evaluation of the humidity control function of the building material composition of the present example is based on the moisture absorption / release amount evaluation, the humidity control ability evaluation, the equilibrium moisture content, etc. that are fried as a reference standard for the humidity control performance evaluation standard of the humidity control building material. These overall effects were predicted, and the degree was displayed in the order of large effect: ◎, medium effect: ◯, small effect: △.
In addition, the strength and viscosity of the effect were evaluated based on cracks, surface breakage, separation, and peeling after 2 years from construction.

  As described above, the building material composition of the present invention and its manufacturing method achieve simple manufacturing and cost reduction using a small variety of raw materials, and are particularly excellent in troweling workability. With no need for skill, the work efficiency is very good, the color can be changed freely, the texture, texture and texture are well finished, and the finished wall has sufficient strength and viscosity. Prevents cracking, breakage of the surface, separation and peeling, and has an appropriate humidity control function, antibacterial / antifungal performance, no discoloration, extremely little deterioration over time, and long life Has been realized and contributed greatly to the construction industry by being widely used in the interior business in the construction industry.

Claims (3)

A composition for building materials, containing slaked lime and clay, having a slaked lime content of 3 to 60 w% and a clay content of 97 to 40 w%. The composition for building materials according to claim 1, wherein salt slaked lime that is baked while adding salt is used as slaked lime, and an off-white powder containing no chemical substance is used as a clay. The salt-burned lime and the American clay are blended, the blending ratio of the salt-burned lime is 3 to 60 w%, the blending ratio of the American clay is 97 to 40 w%, and 100 w% of the blend of the salt-burned lime and American clay is 50 w of water. % Of the composition for building materials, wherein the composition is added and mixed.