JP2003286068A - Hardening accelerator for inorganic adhesive composition, inorganic adhesive composition and method of producing compact thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensive hardening accelerator for an inorganic adhesive composition of which material can easily be obtained, and which is easily treatable even in the job site, and does not contain organic compositions at all, thus is safe to the human body and environment, and to provide an inorganic adhesive composition. <P>SOLUTION: A sodium silicate thick aqueous solution of 100 g is added to water of 100 g, and stirring and mixing are performed for 1 min to obtain a water glass aqueous solution of 200 g. The water glass aqueous solution of 200 g, is charged with bentonite of 50 g as a binder, and coal ash of 50 g as a hardening accelerator, and kneading is performed at a room temperature for about 3 min. The kneaded matter of 300 g is charged with chaff of 300 g, and stirring is performed at a room temperature for about 1 min. The stirred matter is filled into a frame mold of 40 cm×40 cm, is pressurized under the pressure of about 1 kg/cm<SP>2</SP>, and is taken out after holding for about 6 hr, so that a boardlike compact of 40 cm×40 cm with a thickness of about 1 cm in a state where holding with hands is possible can be obtained. The boardlike compact is almost perfectly hardened after leaving for about 12 hr at a room temperature, and is made usable as a wall material. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a molded article using the water glass-based adhesive composition, the silanol-based adhesive composition or the colloidal silica-based adhesive composition and a method for producing the same, and an inorganic curing accelerator or / Another object of the present invention is to provide a curing accelerator for an inorganic adhesive composition, an inorganic adhesive composition and a method for producing a molded article thereof, characterized in that coal ash is used as the inorganic curing modifier.

[0002]

2. Description of the Related Art In recent years, the sick house syndrome has become a problem in the interiors of houses immediately after new construction or remodeling. For example, interior materials such as plywood and wallpaper contain volatile chemical substances contained in adhesives as air inside the interior. It is said that it is released inside and causes headache, nausea and chemical hypersensitivity (for example, allergy). It is thought that the cause is the use of organic adhesives containing organic compounds such as formaldehyde, toluene and xylene. ing. Also, not only the resident of the house,
At the interior construction site and the plywood manufacturing site, damage to workers who directly deal with the problematic organic adhesive has become a problem, and at the same time, various regulations have arisen regarding its handling. Therefore, in recent years, for adhesive compositions used for interior materials of buildings and wood-based building materials, a water-soluble and inorganic composition having sufficient adhesive strength, excellent fire resistance, heat resistance, and heat insulation properties. The number of development projects for water-soluble inorganic compositions containing as the main ingredient has increased.

For example, at least montmorillonite, hydrous aluminum silicate, and mineral fibers are added to a silanol solution having a siloxane skeleton.
By mixing metallic silicon, sodium fluoride (or hydrogen fluoride), sodium hydroxide and water to obtain by heat generation or heating reaction, it has sufficient adhesive strength and excellent fire resistance, heat resistance, and heat insulation. In addition, there is a development project of a fire-resistant adhesive disclosed in Japanese Patent Laid-Open No. 08-41426, which is characterized by its easy manufacture and easy handling at a construction site. Further, for example, an object is to provide a water-based adhesive containing an inorganic substance as a main component, which is suitable as an adhesive for paper, fibers, non-woven fabrics, and woven fabrics.
A water-based adhesive mainly composed of an inorganic substance containing an inorganic powder having a particle size of up to 6.5, a silanol-modified polyvinyl alcohol, and a water-soluble polymer compound having a carboxyl group in the molecule. JP-A-10-29853
There is a development project of water-based adhesive mainly composed of No. 0 inorganic material.

Further, for example, another object is to stabilize an inorganic adhesive composition containing colloidal silica as a binder. A solution to the problem is to use colloidal silica as a binder, powdery oxide as a filler, and water as the balance. The inorganic adhesive composition according to claim 1, wherein the composition has a water-soluble Na ₂ O concentration of 300 to 300 after being held at 50 ° C. for 3 days or more.
There is a development project of an inorganic adhesive composition disclosed in Japanese Patent Application Laid-Open No. 09-263732, which is a composition whose pH is adjusted to 1,500 ppm and pH of 9.5 to 11.0. Also, for example,
For the purpose of providing a heat-resistant inorganic composite excellent in heat resistance and incombustibility, a composite using a main agent composed of an inorganic powder and a binder composed of boric acid and zinc oxide is used as a constituent, using colloidal silica. There is a development project of a method for producing a heat-resistant inorganic composite disclosed in Japanese Patent Laid-Open No. 03-79313, which is characterized by being impregnated with a water-soluble inorganic adhesive.

Furthermore, for example, it is intended to impart quick-drying property to improve the shape retention of the coating film immediately after coating and to improve the workability on a porous surface and the like. Water glass of water-soluble sodium silicate, antimony pentoxide as a viscosity and drying rate adjusting agent, and alcohol as a reaction aid to enhance the reactivity of the water glass and antimony pentoxide as essential components, Japanese Patent Laid-Open No. 06-
There is a development project of water-soluble inorganic adhesive No. 25610 and its manufacturing method. Further, for example, it is an example of the invention of a water glass-based inorganic adhesive composition by the inventors of the present invention, a known inorganic adhesive composition or an inorganic thickener can be used, and also during the production of an adhesive or adhesion. Does not generate substances harmful to the human body during work or disposal, has fire resistance, heat resistance, flame retardancy and heat insulation properties, and also has water resistance using an inorganic water resistance imparting agent,
It is a completely inorganic adhesive composition, the material is easily available,
In addition, it is easy to manufacture with simple and inexpensive equipment, is easy to handle at a construction site, and is safe and healthy for both human body and environment, Japanese Patent Application No. 2001-33872.
There is a development project for No. 2 fire-resistant insect-repellent inorganic adhesive composition.

In Japan, a large amount of coal has been used as an important energy source for thermal power generation even in recent years. For example, the amount of power generation coal used in 1995 was about 25 million tons, and the coal ash generated after combustion reached about 4 million tons. Of the generated coal ash, about 2 million tons (50%) is effectively used, of which 60% is in the cement field,
20% for civil engineering, 10% for construction, 3% for agriculture and fisheries, and the rest is treated as landfill or sea landfill. In addition to thermal power plants, general industry produces about 1.5 million tons of coal ash. Combined, the total amount in Japan will be 5.5 million tons. Since the amount of coal ash generated will continue to increase, effective use of coal ash is urgently needed. Of note in coal ash, there are fine particles called fly ash.Fly ash is generated when pulverized coal is burned at a thermal power plant, etc.The coal ash melts and smokes with high temperature combustion gas. It was rapidly cooled on the way to the road and became glassy spherical fine particles due to surface tension.

For example, some fly ash is used as fly ash cement because it has a self-hydrating effect. Further, for example, a hardened body of coal ash containing fly ash as a main component of a hardening material is known, and is particularly used for port construction in contact with seawater. This fly ash is mainly obtained as a by-product of a thermal power plant that uses coal as a fuel, and its standard is a JIS standard with a specific gravity of 1.95 or more and a specific surface area of 2500 cm2.
/ G or more, 45 μm sieve residue 40% or less, SiO2
It is specified to be 4.5% or more. Fly ash is spherical finer particles that are finer than cement particles. Therefore, for example, when this is mixed in mortar and concrete, (1) the fine particles act like ball bearings, the fluidity increases, and kneading and construction are easy. It has the advantages that (2) the unit water amount can be made small, and (3) the long-term strength can be expected to increase due to the pozzolanic reaction, and it has already been partially used as a raw material for fly ash cement. ing.

[0008]

However, in the case of the development of the fire-resistant adhesive disclosed in Japanese Patent Laid-Open No. 08-41426, which is a silanol-based adhesive composition, sufficient adhesive strength and excellent fire resistance, heat resistance, and heat insulation properties have been obtained. However, it has been pointed out that the water resistance is not sufficient, though it is characterized by being easy to manufacture and easy to handle at the construction site. Further, a silanol-based adhesive composition is disclosed in JP-A-10-298.
In the water-based adhesive development project mainly composed of an inorganic substance disclosed in Japanese Patent No. 530, it is pointed out that the water resistance is provided, but the flame retardancy and the heat insulation are not sufficient. Although it is easy to handle at the construction site, it has been pointed out that the water resistance is not sufficient.

Further, in the development project of the inorganic adhesive composition of Japanese Patent Application Laid-Open No. 09-263732, which is a colloidal silica-based adhesive composition, it is characterized by good stability and storability, but the water resistance is not sufficient. Has been pointed out. In addition, JP-A-H03-03242 using a colloidal silica-based adhesive composition
The development project of the method for producing a heat-resistant inorganic composite of No. 79313 is characterized by excellent heat resistance and incombustibility, but it has been pointed out that the water resistance is not sufficient.

Further, in the development project of the water-soluble adhesive composition of JP-A-06-25610, which is a water-glass type adhesive composition, and a method for producing the same, quick-drying property is imparted and the shape retention of the coating film immediately after coating is maintained. Although it is characterized by improving workability on a porous surface, it has been pointed out that the water resistance is not sufficient. Moreover, in the development project of the fire-resistant insect-repellent inorganic adhesive composition of Japanese Patent Application No. 2001-338722, which is a water glass-based adhesive composition, it is characterized by having fire resistance, heat resistance, flame retardancy and heat insulation. However, it has been pointed out that the water resistance is not sufficient.

From the above facts, the present inventor has examined whether the above silanol-based adhesive composition, colloidal silica-based adhesive composition or water glass-based adhesive composition can be used for improving water resistance and strength, and coal ash, particularly After investigating the curing accelerating property and the curing controllability of fly ash, it is generally found that the fly ash generally cures a liquid composition containing a silicon compound under specific conditions to impart sufficient water resistance. Is a useful curing accelerator known in the art, and fly ash itself is generally known to cause a pozzolanic reaction, which is a self-curing reaction due to the addition of water, and impart sufficient water resistance. It has been found that the development of the application to a water-soluble inorganic adhesive composition is delayed despite being a curing accelerator.

The present invention has been made in order to solve the above-mentioned problems, and is a water-soluble completely inorganic adhesive composition which does not use any organic composition, and has fire resistance, heat resistance or difficulty. An object of the present invention is to provide a curing accelerator for an inorganic adhesive composition and an inorganic adhesive composition which are excellent in curability and water resistance while sufficiently ensuring the flammability or the heat insulating property. Further, the curing accelerator for the inorganic adhesive composition that achieves the above-mentioned object of the invention is a material that is easily available, and is an inexpensive material,
Further, it is an object of the present invention to provide a curing accelerator for an inorganic adhesive composition and an inorganic adhesive composition, which are easy to handle at a construction site and safe for human bodies and the environment. Another object of the present invention is to provide a curing accelerator for the above-mentioned inorganic adhesive composition, a molded article most suitable for the inorganic adhesive composition, and a method for producing the same.

[0013]

[Means for Solving the Problems] A first means for solving the problems is a water glass-based adhesive composition containing water glass, which is a water-soluble inorganic adhesive composition, as a main component. For an inorganic adhesive composition, which is a completely inorganic adhesive composition which does not use any organic composition by adding an inorganic curing accelerator or / and an inorganic curing regulator when the adhesive composition is used Although it is to provide a curing accelerator and an inorganic adhesive composition, the water glass of the water glass-based adhesive composition generally indicates a concentrated aqueous solution of potassium silicate or sodium silicate, etc. Assuming that the commercially available water glass has 100 parts by weight of water, the potassium silicate and the sodium silicate have 10 to 30 parts by weight, and it is preferable to use an aqueous solution of sodium silicate in the present invention. Regarding the inorganic curing accelerator, it is known that a silicon dioxide (SiO ₂ ) component reacts with a calcium component as a main component of the water glass under predetermined conditions to form a hydrated cured product. As the calcium-based component in this case, calcium oxide (CaO) and calcium hydroxide (Ca (OH) ₂ ) can be exemplified as typical ones, but other components may be used.

Further, regarding the above-mentioned inorganic curing regulator,
An oxide or hydroxide of at least one metal selected from aluminum, magnesium, iron, zinc, boron and calcium is preferably used, and alumina powder is particularly effective. Further, hydroxides such as aluminum hydroxide and calcium hydroxide are also preferably used, and carbonates such as calcium, sodium and magnesium can also be used. Further, when the curing accelerator or the curing regulator is used, the amount of the curing accelerator added is the adhesive composition 100.
0 to 100 parts by weight, particularly 10 to 60 parts by weight is preferable with respect to parts by weight, and the addition amount of the curing regulator is preferably 0 to 30 parts by weight with respect to 100 parts by weight of the curing accelerator.

A second means for solving the problem is to use a silanol-based adhesive composition which is a water-soluble inorganic adhesive composition, wherein an inorganic curing accelerator or / and / or an inorganic curing accelerator is used when the silanol-based adhesive composition is used. To provide a curing accelerator for an inorganic adhesive composition and an inorganic adhesive composition, which is a completely inorganic adhesive composition which does not use any organic composition by adding an inorganic curing modifier. However, the silanol of the silanol-based adhesive composition may be of any type as long as it has a siloxane skeleton obtained by the hydration reaction of metallic silicon. Regarding the inorganic curing accelerator, the contents described in the first means for solving the problem are followed. Further, regarding the inorganic curing modifier, the contents described in the first means for solving the problem are followed.

A third means for solving the problem is to use a colloidal silica adhesive composition which is a water-soluble inorganic adhesive composition, wherein an inorganic curing accelerator or an inorganic curing accelerator is used when the colloidal silica adhesive composition is used. To provide a curing accelerator for an inorganic adhesive composition and an inorganic adhesive composition, which is a completely inorganic adhesive composition that does not use any organic composition by adding an inorganic curing control agent / and However, as for the colloidal silica of the colloidal silica-based adhesive composition, a commercially available product (particle size 5 to 300 μm) is used.
m), but it is necessary to adjust the particle size. The preferred particle size range is generally 10 to 20 μm.
When the particle size is m and the particle size is less than 10 μm, gelation of colloidal silica is likely to occur, and it is difficult to obtain a high concentration of colloidal silica. Therefore, when the colloidal silica is used as an adhesive, cracks are likely to occur in the adhesive portion. Incidentally, colloidal silica is a liquid having a concentration as high as possible under normal conditions because the bonding strength is small as compared with other water glass-based adhesive compositions and silanol-based adhesive compositions,
Preferably, 35 to 40% by weight is used. On the other hand, if the particle size exceeds 20 μm, the adhesive strength becomes small, which is not preferable. A particularly preferable range of particle size is 15
Is about 20 μm. Regarding the inorganic curing accelerator, the contents described in the first means for solving the problem are followed. Further, regarding the inorganic curing modifier, the contents described in the first means for solving the problem are followed.

A fourth means for solving the problems is the first means for solving the problems, characterized in that the inorganic hardening accelerator or the inorganic hardening regulator is coal ash. It is an object of the present invention to provide a curing accelerator for an inorganic adhesive composition and an inorganic adhesive composition according to any one of the third means for solving the problems. With respect to the coal ash, in the present invention, the fly ash is particularly used. Is preferred. Further, coal ash is a mixture of various oxides, and some of the oxides already contained in the coal ash can act as the above curing regulator. For example, in coal ash, SiO ₂ , Al ₂ O
₃ , Fe ₂ O ₃ , CaO and SO ₃ are contained, the SiO ₂ content ratio is 30 to 60 wt%, and the Fe ₂ O ₃ content ratio is 1 to
20% by weight, CaO content of 1 to 30% by weight, SO ₃
It has a chemical composition in which the content ratio is 3.0 to 10% by weight (however, the content ratio of the components is not particularly limited), and as described above, the CaO component serves as a curing material, and therefore coal The ash itself serves as a hardening accelerator, in which case a type having a CaO content of 5 to 20% by weight is preferable, and this type is referred to as coal ash A. Also, C
A type having an aO content of 5% by weight or less has a curability lower than that of the coal ash A and is therefore preferably used as a curing regulator. This type is referred to as coal ash B. In addition, the CaO content ratio is 2
Since the type of 0% by weight or more has a higher curability than that of coal ash A, it is preferably used as a curing regulator, and this type is referred to as coal ash C.

For example, if coal ash B is used as the curing accelerator of the present invention, since the curability is small, coal ash C is added as a curing regulator by adding an appropriate amount of coal ash C to improve the curing property. To work. Further, for example, if coal ash C is used as the curing accelerator of the present invention, since the curability is large, by adding an appropriate amount of coal ash B in order to reduce the curability, the coal ash B acts as a curing regulator. To do. The specific surface area of coal ash A, coal ash B, or coal ash C is not particularly limited. Furthermore, coal ash A, coal ash B, and coal ash C
The particle size is not particularly limited, but for example, the specific surface area of 10,0
In the case of 00 cm2 / g or more, a particle size that can pass through a 45 μm sieve is preferable.

The present inventor has noticed that the coal ash contains SiO ₂ as a main component and an appropriate amount of a CaO component, and the water-soluble inorganic adhesive composition is added thereto to carry out a reaction. Then, the fact that these SiO ₂ , CaO, and water react under specific conditions to cause hydration hardening was confirmed, and the present invention was completed. Further, sodium silicate, which is one of the main components of the water-soluble inorganic adhesive composition, is one of the silicates represented by the chemical formula: Na ₂ SiO ₃ .nH ₂ O, and itself is powdery. Although it is a solid, in most cases, it is commercially available as an aqueous solution, and sodium silicate (water glass) of this aqueous solution has the function of expressing the hardening bondability of the coal ash by condensation by the reaction with the coal ash. Then use it.

A fifth means for solving the problem is to add clay mineral fine powder as a thickener to the water glass adhesive composition, the silanol adhesive composition or the colloidal silica adhesive composition. A curing accelerator for an inorganic adhesive composition and an inorganic adhesive composition according to any one of the first means for solving the problem to the third means for solving the problem, characterized in that As for the clay mineral fine powder, silicon dioxide 40
-60%, aluminum oxide 20-40%, and trivalent iron oxide 1-20% are preferable. However, in order to smoothly carry out the thickening reaction, the content of SiO ₂ is 50% or more. Is desirable. For example, it is preferable to use diatomaceous earth, kaolinite, illite, talc, montmorillonite, cordierite, mullite, sepiolite and the like. The clay fine powder is sufficiently effective when used alone, but the effect is improved by using at least one or more selected from the clay fine powder, for example, montmorillonite and kaolinite, for example, diatomaceous earth. And kaolinite, such as montmorillonite and diatomaceous earth,
Anyway, many combinations are possible, so an example is given here. Further, assuming that the adhesive composition is 100 parts by weight, if the clay fine powder is 10 parts by weight or less, the adhesiveness is too weak to be practical, and the clay fine powder is 50 parts by weight or less.
If it is more than the weight part, the cost becomes high and it is not practical.

A sixth means for solving the problems is to use the water glass adhesive composition, the silanol adhesive composition, the colloidal silica adhesive composition, the thickener, the filler and the coal ash. After kneading and filling or molding the kneaded product in a mold for molding, pressure molding is performed with a pressure molding device at a pressure of 0.1 to 10 Kg / cm 2, and the pressure is held for 1 to 24 hours. A curing accelerator for an inorganic adhesive composition, an inorganic adhesive composition, and a molded article thereof according to any one of the first means for solving the problem to the fifth means for solving the problem, Regarding the filler, any of waste materials may be used as long as it is a waste material, but waste materials of used paper and buildings (woody material, calcium composition system and silicon composition system) And metal chips, etc. Use of a sand used in waste or casting after using waste and plant grain-based, such as is preferred.

The molding in the present invention is not particularly limited as long as it is a known molding method. For example, pressure molding, vibration molding, centrifugal molding and the like can be performed, but pressure molding is preferable. . Further, with respect to the mold for molding and the pressure molding apparatus, a known pressure molding technique can be applied, and further, a known pressure molding can be performed by using a mold having a desired shape and size. By holding the pressure for 1 hour to 24 hours while using the apparatus, it is possible to obtain the intended filler and the inorganic molded article of the inorganic material. As a process for obtaining the molded article of the present invention, sodium silicate, which is one of the main components of the water-soluble inorganic adhesive composition,
It is one of the silicates represented by the chemical formula: Na ₂ SiO ₃ .nH ₂ O, and is itself a powdery solid, but in many cases, it is commercially available as an aqueous solution, and sodium silicate (water In the present invention, the glass) utilizes the function of developing the hardening bondability of the coal ash by the reaction with the coal ash and the condensation by pressure.

A seventh means for solving the problem is that the pressure molding device is a hot press, and the kneaded product is filled or molded in a mold for molding, and then the hot press is used. And 30-300 ° C. for 10 minutes to 12 hours to perform pressure molding, and the curing accelerator for inorganic adhesive composition and the inorganic adhesive composition according to the sixth means for solving the problems. And a method for producing a molded article thereof, the hot press is known and commercially available, and the hot press is used at 30 to 300 ° C, preferably 60 to 250 ° C. Optimally, by holding the material at 100 to 200 ° C. for 30 minutes to 6 hours, it is possible to obtain the desired filler and the inorganic molded product of the inorganic material. In this procedure according to the invention, the pozzolanic nature of fly ash is utilized, for example to react the CaO component in the coal ash. What is called "pozzolan", such as coal ash, is characterized in that the main component is S.
Although it is iO ₂ and contains a considerable amount of Al ₂ O ₃ , each of them contains a large amount of a soluble portion. These soluble SiO ₂ or Al ₂ O ₃ easily react with the CaO component (pozzolan reaction) to produce an insoluble calcium salt. However, its strength development is known to require a long period of time. Therefore, in the present invention, by applying the pressure and heating to the molded product for a predetermined time, it is possible to obtain an intended inorganic molded product of the filler and the inorganic material. Further, as a process for obtaining the molded article of the present invention,
Sodium silicate, which is one of the main components of the water-soluble inorganic adhesive composition, has a chemical formula of Na ₂ SiO ₃ .nH ₂ O.
It is one of the silicates represented by, and is itself a powdery solid, but in many cases, it is commercially available as an aqueous solution.
The sodium silicate (water glass) in this aqueous solution may have a function of exhibiting the hardening binding property of the coal ash by condensation with the coal ash by heating, and this function is also utilized in the present invention.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will now be described in more detail with reference to embodiments, but the present invention is not limited thereto. Although water glass has a concentrated aqueous solution of potassium silicate, sodium silicate, or the like, the concentrated aqueous solution of sodium silicate manufactured by Wako Pure Chemical Industries, Ltd. was used in this embodiment.
Further, bentonite was used as the clay fine powder which is an inorganic thickening agent, and a product manufactured by Katayama Chemical Industry Co., Ltd. was used. Also, S
Coal ash having a chemical composition with an iO ₂ content of 30 to 60% by weight and a CaO content of 1 to 30% by weight was used.

Embodiment 1 First, in a beaker, 250 g of an aqueous solution of water glass prepared by mixing 150 g of a concentrated aqueous solution of sodium silicate with 100 g of water by stirring for 1 minute is prepared. 50 g of bentonite and coal ash A as an inorganic hardening accelerator were added to this water glass solution.
50 g (type having CaO content of 5 to 20% by weight) was added and kneaded for about 3 minutes at room temperature (about 20 ° C.) using a hand mixer (500 rotations / minute). 350 g of this kneaded product and 350 g of rice husks were put in a container and stirred for about 1 minute at room temperature using a hand mixer (500 rotations / minute). This stirrer was filled in a 40 cm × 40 cm mold and was pressed at a pressure of about 1 Kg / cm 2 using a general press, held for about 6 hours, and then taken out to give a solid 40 cm × 40 cm in a hand-held state. Was molded into a board having a thickness of about 1 cm, and after being left at room temperature (about 20 ° C.) for about 12 hours, the board was almost completely cured and could be used as a wall material. After this, this board-shaped molded product was left in water for about 3 minutes and then taken out and dried, but there was no change in the cured state.

Embodiment 2 In a beaker, 250 g of a water glass aqueous solution prepared by mixing 150 g of a concentrated aqueous solution of sodium silicate with 100 g of water and stirring for 1 minute is prepared in advance. 50 g of bentonite and coal ash B as an inorganic curing accelerator in this water glass solution
A hand mixer (50) was used in which 30 g (type having CaO content of 5% by weight or less) and 20 g of coal ash C (type having CaO content of 20% by weight or more) as an inorganic curing regulator were added.
The mixture was kneaded for about 3 minutes at room temperature (about 20 ° C.) using 0 revolutions / minute. 350 g of this kneaded material and 350 g of rice husks
Was put in a container and stirred for about 1 minute at room temperature using a hand mixer (500 rotations / minute). This stirrer was filled in a 40 cm × 40 cm mold, pressurized with a general press at a pressure of about 2 Kg / cm 2, held for about 3 hours, and then taken out to give a solid 40 cm × 40 cm in a hand-held state. Was molded into a board having a thickness of about 1 cm, and the board-shaped molded product was almost completely cured by drying with warm air at about 60 ° C. and was usable as a wall material. After this, the board-shaped molded product is submerged in water for about 3
After leaving it for a minute, it was taken out and dried, but there was no change in the cured state.

Embodiment 3 In a beaker, 250 g of a water glass aqueous solution prepared by mixing 150 g of a concentrated aqueous solution of sodium silicate with 100 g of water and stirring for 1 minute is prepared in advance. 50 g of bentonite and coal ash C as an inorganic curing accelerator in this water glass solution
50 g (type having CaO content of 20% by weight or more) was put therein and kneaded for about 3 minutes at room temperature (about 20 ° C.) using a hand mixer (500 rotations / minute). 350 g of this kneaded material and 350 g of rice husks were put in a container and about 1 at room temperature using a hand mixer (500 rotations / minute)
Stir for minutes. This agitated product was filled in a 40 cm × 40 cm mold, and about 0.5 Kg / g was applied using a general hot press.
It is pressed at a pressure of cm2 and heated at a temperature of about 200 ° C for about 1 hour, then taken out, it is almost completely solidified and is molded into a board of 40 cm x 40 cm with a thickness of about 1 cm. It could be used as a wall material. After this, this board-shaped molded product was left in water for about 3 minutes and then taken out and dried, but there was no change in the cured state.

Embodiment 4 Using the inorganic adhesive composition of Embodiment 1, 40 cm ×
Two plywood boards each having a thickness of 40 cm and a thickness of 5 mm were coated with the inorganic adhesive composition on each side to form a plywood board having a thickness of 10 mm, and left for about 12 hours, and then an adhesive strength test was conducted. Using a tensile tester, the adhesive strength was measured under the conditions of a tensile speed of 1 mm / min. The adhesion strength of the sample was 6.5 Kgf / cm ² . This value is the JIS standard for interior materials.
A 6909 (Thin finish coating material) and JIS A 69
10 (multilayer finish coating material) has an adhesion strength in the standard state of ³ to 5 Kgf / cm ² and it is shown that the inorganic adhesive composition of the present embodiment has sufficient adhesion strength. Was done. A sample of this plywood was left in water for one day, but it did not peel off. Both sides of this plywood were coated with the above-mentioned inorganic adhesive composition, allowed to stand for about 12 hours, and then subjected to a flame retardancy test. An arbitrary part of this plywood was burned with a burner at about 1,000 ° C. for 5 minutes, but some smoke was generated, and only the part exposed to the flame without being ignited was carbonized.

[0029]

EFFECT OF THE INVENTION By providing the curing accelerator for an inorganic adhesive composition, the inorganic adhesive composition and the method for producing the molded article of the present invention having the above constitution, the following excellent effects can be achieved. . (1) The curing accelerator for an inorganic adhesive composition and the curing modifier for an inorganic adhesive composition used in the present invention are coal ash, which is an industrial waste. By recycling the coal ash, environmental conservation measures can be taken. It is valid. (2) Coal ash costs 3000 to 5000 yen per ton to be treated as waste. Therefore, the raw material (coal ash) as the molded product of the present invention is inexpensive and easily available in large quantities, and the product cost of the molded product can be reduced. (3) The cured product of the coal ash and the inorganic adhesive composition of the present invention is a kind of simple ceramics and has a curing temperature of 0 to 300 ° C.
Since the temperature is low, the ceramic body can be formed with low energy. (4) The simple ceramics molded body containing the waste material produced by the present invention as a filler has a water resistance, insect / mold resistance, fire resistance,
It has excellent flame retardancy, heat insulation, and sound insulation, and has sufficient strength other than being used as a material for machine structures. (5) Since the molded product of the present invention is a product manufactured by using waste as a filler, recycling the product is effective as an environmental protection measure. (6) The molded product according to the present invention is a completely inorganic molded product that does not use any organic composition, and thus is very safe with little danger during production or on site and is completely inorganic. That is, while having fire resistance and heat insulation, the inorganic adhesive composition of the present invention exhibits strong alkalinity and thus has good antibacterial and antifungal properties, and by using the present invention, propagation of various bacteria is possible. Can be suppressed and the generation of mold can be prevented. (7) Further, since the manufacturing method of the present invention does not require a drying step, the manufacturing cost can be reduced. Therefore, the simple ceramics molded product of the present invention, by making use of its characteristics, for example, interior materials and exterior materials for construction, finishing materials for construction, construction fields such as decoration materials for construction, roads utilizing soundproofing properties. It can be effectively used in a wide range of applications such as the side wall, civil engineering fields such as water pipes, exterior members, and electrical insulating members. (8) The molded article of the present invention can be effectively used in a wide range of applications because it can be controlled by the type and addition amount of the curing regulator.

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Claims (7)

[Claims] 1. A water glass-based adhesive composition comprising water glass as a main component, which is a water-soluble inorganic adhesive composition, wherein an inorganic curing accelerator and / or an inorganic curing accelerator is used when the water glass-based adhesive composition is used. A curing accelerator for an inorganic adhesive composition and an inorganic adhesive composition, which is a completely inorganic adhesive composition in which an organic composition is not used at all by adding a system curing regulator. 2. A silanol-based adhesive composition, which is a water-soluble inorganic adhesive composition, wherein an inorganic curing accelerator or / and an inorganic curing regulator is added when the silanol-based adhesive composition is used. A curing accelerator for an inorganic adhesive composition and an inorganic adhesive composition, which is a completely inorganic adhesive composition that does not use any organic composition. 3. A colloidal silica-based adhesive composition which is a water-soluble inorganic adhesive composition, wherein an inorganic curing accelerator or / is used when the colloidal silica-based adhesive composition is used.
And a curing accelerator for an inorganic adhesive composition and an inorganic adhesive composition, which is a completely inorganic adhesive composition that does not use any organic composition by adding an inorganic curing regulator. 4. The coal-based ash as the inorganic hardening accelerator or the inorganic hardening regulator.
4. The curing accelerator for an inorganic adhesive composition and the inorganic adhesive composition according to claim 3. 5. The clay mineral fine powder is added to the water glass-based adhesive composition, the silanol-based adhesive composition, or the colloidal silica-based adhesive composition as a thickener. The curing accelerator for an inorganic adhesive composition and the inorganic adhesive composition according to any one of claims 1 to 3. 6. The water glass-based adhesive composition, the silanol-based adhesive composition, or the colloidal silica-based adhesive composition, the thickener, the filler, and the coal ash are kneaded,
The kneaded product is filled or molded in a mold for molding, and then 0.1 to 10 Kg / cm 2 using a pressure molding device.
The pressure-sensitive molding agent according to any one of claims 1 to 5, wherein the pressure-sensitive molding is performed under pressure at a pressure of 1 to 24 hours, and the inorganic adhesive composition and the molding thereof. Method of manufacturing things. 7. The pressure molding device is a hot press, and after the kneaded product is filled or molded into a molding frame, the hot press is used to obtain a temperature of 30 to 300 ° C.
The method for producing a curing accelerator for an inorganic adhesive composition, an inorganic adhesive composition and a molded article thereof according to claim 6, wherein the composition is heated at 10 minutes to 12 hours for pressure molding.