JPH0632643A - Hydraulic inorganic composition - Google Patents

Abstract

PURPOSE:To obtain an inorganic hardened material having lightness in weight and excellent nailing processability free from reduction in strength and reduction by freezing and fusion by blending a hydraulic inorganic substance with a given amount of wood flour subjected to water repellent treatment with a wax-based sizing agent or a neutral sizing agent. CONSTITUTION:100 pts.wt. hydraulic inorganic substance (Portland cement) is blended with 0.5-20 pts.wt. wood flour subjected to water repellent treatment with a wax-based sizing agent (e.g. zirconium-based water repellent which is an emulsion obtained by adding a wax emulsion consisting essentially of an inert and an unsaponifiable paraffin as a by-product of petroleum refining plant and a zirconium compound to a high-boiling wax and stably emulsifying with a surfactant) or a neutral sizing agent (e.g. one for treating wood flour at pH from neutrality to alkalinity, fixing to a woody component and providing the wood flour with waterproofness and water resistance) and 20-100 pts.wt. water, filtered or dehydrated and dried at 70-100 deg.C for 0.5-12 hours. The composition may be mixed with a lightweight filler, reinforcing fibers, a water-soluble polymer or an inorganic filter as required.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic inorganic composition suitable as a raw material for the production of an inorganic cured product for use in building materials such as interior and exterior materials.

[0002]

2. Description of the Related Art Conventionally, there has been well known a method for producing an inorganic lightweight cured product by using a raw material obtained by adding water to an inorganic inorganic material such as cement and gypsum and water and an inorganic lightweighting material such as perlite and fly ash. Has been.

As this method, for example, JP-A-49-1
As described in JP-A-03923, a method for producing a lightweight concrete material by mixing a foamed hollow member made of obsidian as an aggregate into cement, or as described in JP-A-60-112660, a fly cement is applied to hydraulic cement. There is a method of producing an inorganic hardened material by mixing an ash balloon.

However, since the inorganic lightweight cured material containing the inorganic lightweight material obtained by such a method is a brittle foam, the inorganic lightweight cured material may have a local impact such as nailing during construction. However, there is a problem that cracks easily occur when performing various operations.

Further, for example, as described in JP-A-64-65052, a method for producing an inorganic building material using a raw material obtained by adding pulp fiber to cement has been proposed. Since the dispersibility is poor, there is a limit to the amount of addition, and since the pulp fibers are arranged in one direction due to the molding characteristic of extrusion molding, there is a problem that cracks occur in the orientation direction during nailing. .

However, as described in JP-A-59-54654, the inorganic hydraulic material has an average particle size of 0.5 to 3 m.
It has been proposed to use an inorganic hydraulic material cured product in which 3 to 9% by weight of m wood powder is present and which has good nailing workability.

[0007]

However, since wood powder is a water-absorbing material, it is necessary to add water twice or more the amount added. Therefore, in order to enable the target nailing workability of the obtained inorganic cured product, it is necessary to inevitably increase the compounding water with an increase in the amount of wood powder added, whereby the resulting inorganic cured product is obtained. However, there is a problem that the strength, freeze-thaw property, etc. are reduced.

[0008] The above-mentioned conventional problems of the present invention are solved, and a hydraulic inorganic material suitable as a raw material for producing an inorganic cured product which is excellent in light weight, nailing workability, strength and freeze-thawing property. It was made for the purpose of providing a composition.

[0009]

According to the present invention, 100 parts by weight of a hydraulic inorganic substance, 0.5 to 20 parts by weight of wood powder that has been water repellent treated with a wax-based sizing agent or a neutral sizing agent, and water are used. Two
It is a hydraulic inorganic composition consisting of 0 to 100 parts by weight.

In the present invention, the hydraulic inorganic substance can be used without particular limitation as long as it is an inorganic substance which shows a hardening property when kneaded with water. For example, ordinary portland cement, special portland cement, alumina. Cement, plain cement such as Roman cement, acid-resistant cement, fire-resistant cement, special cement such as water glass cement, gypsum, lime, magnesia cement and other hard-setting cement are used, in particular, in terms of strength and water resistance, Portland cement and alumina cement are preferably used.

In the present invention, wood flour that has been treated to be water repellent with a wax-based sizing agent or a neutral sizing agent is used. When wood flour that has been water repellent treated with a wax-based sizing agent or neutral sizing agent is added to a hydraulic inorganic substance, the wax-based sizing agent or neutral sizing agent is stable against the hydraulic inorganic substance. The wax-based sizing agent or neutral sizing agent fixed to the wood powder does not come off, and the effect of the water repellent treatment can be maintained for a long period of time.

The wood powder used as a base material is not particularly limited as long as it is a crushed powder of wood used as a building material, etc. From the economical and environmental viewpoints, lumber,
It is preferable to use crushed powder of wood chips generated during crushing of wood chips, waste wood such as plywood industry, waste wood hardwood mixed inorganic hardened wood, and the like. From the viewpoint of the surface smoothness of the obtained inorganic cured product, the particle size of the wood powder is preferably 500 μm or less.

The wax-based sizing agent or neutral sizing agent is
Water resistance in the paper industry or fiberboard industry,
It is one of the sizing agents usually used for the purpose of imparting waterproofness.

The wax-based sizing agent is an emulsion of wax by using an appropriate emulsifier. As a wax-based sizing agent, a wax emulsion mainly containing paraffin, which is an inactive, non-saponifiable hydrocarbon, obtained as a by-product of a petroleum refining plant, and a zirconium compound are added to a high-boiling wax and stabilized with a surfactant. A zirconium water repellent which is an emulsified emulsion is preferably used.

Neutral sizing agents are neutral to alkaline P
It treats wood flour with H and fixes it to the wood component of wood flour to give it sufficient waterproofness and water resistance. It reacts directly with hydroxyl groups such as cellulose in the wood component and forms a covalent bond. It is roughly classified into a reactive sizing agent for treating fibers and a cationic sizing agent having self-treating property by a cationic group such as a quaternary ammonium salt.

As the reactive sizing agent, for example, alkyl ketene dimer, alkenyl succinic anhydride and the like are used.

Examples of the cation sizing agent include aliphatic cations such as alkyl trimethyl ammonium chloride, dialkyl dimethyl ammonium chloride and alkyl benzyl dimethyl ammonium chloride obtained by cationizing a hydrophobic substance such as petroleum resin or higher fatty acid with polyalkylene polyamine. A sizing agent such as a quaternary ammonium salt or a sizing agent obtained by cationizing a copolymer of a hydrophobic monomer and maleic anhydride with a polyalkylene polyamine or the like is used.

Rosin-based sizing agents containing abietic acid type resin acid, which is the most common sizing agent, as the main raw material are acidic sizing agents, so that they lose their water repellency in the alkaline region, while these sizing agents are used in the alkaline region. However, it shows sufficient water repellency.

As a method of treating the surface of the wood powder with these water repellents, for example, 100 parts by weight of an aqueous solution containing 1% by weight or more of the dry weight of the wood powder mixed with the sizing agent solid content is used. A method in which 0.5 to 10 parts by weight of powder is added and mixed, followed by filtration or dehydration, and drying at 70 to 100 ° C. for 0.5 to 12 hours is preferably adopted. When the solid content of the sizing agent is less than 1% by weight, it tends to be difficult to obtain wood flour having sufficient water repellency.

A suitable range of the solid content of the water repellent agent that effectively exerts water repellency on the wood powder is 1 to 3 relative to the dry weight of the wood powder.
It is 00% by weight. Here, in order to increase the water-repellent treatment of the sizing agent on the wood powder, a treatment agent such as polyamide polyamine-based cationic polymer, cationized starch, and aluminum sulfate may be added. A suitable amount of the treating agent is 10 to 100% by weight based on the dry weight of wood flour.

The amount of wood powder contained in the hydraulic inorganic composition is 0.5 with respect to 100 parts by weight of the hydraulic inorganic material.
It should be ~ 20 parts by weight. The amount of wood flour added is 0.5
If it is less than 20 parts by weight, the amount of addition is too small and there is no effect of improving the lightness and nailing workability. On the contrary, if it is more than 20 parts by weight, a volume of wood powder that does not contribute to strength is required. Since the amount is greater than the above, the strength of the obtained inorganic cured body is reduced.

The amount of water used in the present invention is
20 to 100 should be suitable for 100 parts by weight of cement. If the amount of water added is less than 20 parts by weight, the hydraulic inorganic substance will not be sufficiently cured, and the dispersibility of the composition will decrease. Conversely, if it exceeds 100 parts by weight, However, the strength of the obtained inorganic cured product is reduced.

In the present invention, it is more effective to add a lightweight filler. As a lightweight filler, specific gravity is 0.01
Those of 1 to 1 are preferably used. When the specific gravity is less than 0.01, the strength of the obtained inorganic cured product tends to decrease, and when it exceeds 1, on the contrary, the effect of weight reduction tends to be difficult to obtain.

The lightweight filler is not particularly limited as long as it does not dissolve in water and does not inhibit the hardening reaction of the hydraulic inorganic substance, and examples thereof include silica balloons, perlite, fly ash balloons, shirasu balloons, glass balloons,
Inorganic materials such as foamed sintered clay and inorganic natural foams, styrene beads, foamed beads typified by organic microballoons such as vinylidene chloride microballoons, crushed powder of synthetic resin foam such as urethane foam and styrene foam Etc. are used. These lightweight fillers may be used alone or in combination of two or more.

The lightweight filler is added in an amount of the hydraulic inorganic substance 1
0.1 to 100 parts by weight is suitable for 00 parts by weight. If the addition amount is less than 0.1 part by weight, the effect of reducing the weight of the obtained inorganic cured product tends to be small, and conversely,
When it exceeds 100 parts by weight, the mechanical strength of the obtained inorganic cured product tends to be lowered.

In the present invention, reinforcing fibers may be added if necessary. As the reinforcing fiber, any one can be used depending on the performance to be imparted to the inorganic cured body, for example, vinylon, polyamide, polyester,
Organic fibers such as polypropylene, aramid and rayon, glass fibers, plant fibers such as pulp and hemp, carbon fibers and steel fibers are used.

The length of the reinforcing fiber is preferably 1 to 10 mm. When the length is less than 1 mm, the reinforcing effect of the obtained inorganic cured product tends to be small. On the contrary, when the length is more than 10 mm, reaggregation occurs during mixing, and fiber balls are easily formed by entanglement, which is advantageous. It tends to be difficult to improve the strength of the cured inorganic material.

The thickness of the reinforcing fiber is preferably 5 to 100 μm in diameter. When the diameter is less than 5 μm, the particles tend to aggregate, and when the diameter exceeds 100 μm, the reinforcing effect of the obtained inorganic cured product tends to decrease.

The amount of reinforcing fiber added is 10
0.1 to 20 parts by weight is suitable for 0 parts by weight. When the addition amount is less than 0.1 parts by weight, the reinforcing effect is small, and when it exceeds 20 parts by weight, the dispersibility of the reinforcing fibers tends to be lowered.

In the present invention, a water-soluble polymer may be added if necessary. The water-soluble polymer dissolves in water to give viscosity, enhances the dispersibility of the inorganic filler and the reinforcing fiber, enhances the fluidity of the mixture to improve the shapeability, and
It can be a bonding material that absorbs excess water in the inorganic cured body and fills the voids between the hydraulic inorganic substance particles,
For example, cellulose ethers such as methyl cellulose, hydroxymethyl cellulose, hydroxyethyl cellulose, carboxymethyl cellulose, hydroxypropyl methyl cellulose, polyvinyl alcohol, polyacrylic acid and the like are used.

The amount of the water-soluble polymer added is preferably 0.5 to 5 parts by weight based on 100 parts by weight of the hydraulic inorganic substance.
If the addition amount is less than 0.5 parts by weight, the fluidity of the composition tends to be insufficient, and if it exceeds 5 parts by weight,
The water resistance of the resulting inorganic cured product tends to decrease.

In the present invention, an inorganic filler having a specific gravity of more than 1 may be added if necessary. Specific gravity is 1
As the inorganic filler exceeding, it is not particularly limited as long as it does not dissolve in water and does not significantly impair the action of the structural material used in the present invention. For example, silica sand, cement mortar such as river sand Aggregate, fly ash, silica flower, silica fume, bentonite,
Admixtures for mixed cement such as blast furnace slag, natural minerals such as antigorite, lizardite, montmorillonite, sepiolite, wollastonite, calcium carbonate, mica and talc are used. These may be used alone or in combination of two or more.

The amount of the inorganic filler added is preferably 200 parts by weight or less based on 100 parts by weight of the hydraulic inorganic substance. If the amount added exceeds 200 parts by weight, the strength of the resulting inorganic cured product tends to decrease.

In order to produce an inorganic cured product using the hydraulic inorganic composition of the present invention, a hydraulic inorganic substance, sizing-treated wood flour, water and, if necessary, a specific gravity of 0.01 to 1.0. A composition containing an inorganic filler, a reinforcing fiber, an inorganic filler having a specific gravity of more than 1 and the like is mixed to prepare a molding material, and extrusion molding is performed to mold a hydraulic inorganic molded body. As the extrusion molding method, any conventionally known molding method can be adopted.

By curing this hydraulic inorganic molded body, an inorganic cured body is produced. As the curing method, any conventionally known method can be adopted, and for example, underwater curing, steam curing, autoclave curing and the like are appropriately adopted.

[0036]

The hydraulic inorganic composition of the present invention comprises 100 parts by weight of a hydraulic inorganic substance, 0.5 to 20 parts by weight of wood flour which has been water repellent treated with a wax sizing agent or a neutral sizing agent, and water. Two
Since it is composed of 0 to 100 parts by weight, by using it as a raw material, it is possible to improve the lightness and the nailing workability of the obtained inorganic cured body by taking advantage of the lightness, cushioning property and cushioning property of wood powder. Moreover, since the surface of the wood flour is treated to be water repellent, it is not necessary to increase the amount of compounding water with the addition of the wood flour, and it is possible to reduce the strength and freeze-thaw property of the resulting inorganic cured product. Never come

[0037]

[Examples] Examples 1 to 6 and Comparative Examples 1 to 5 (1) Preparation of wood powder The following wood powder was prepared and used. Water-repellent treated wood powder 1 Evenly mixed wax sizing agent (paraffin wax manufactured by Arakawa Chemical Co., Ltd .: trade name "Size Pine W-116"
H ") 2 parts by weight of pulverized wood waste wood materials for building materials (manufactured by Otomo Chemical Co., Ltd .: 80-mesh wood powder) is added to 100 parts by weight of an aqueous solution containing 1% by weight, and the mixture is mixed with an Erich mixer for 10 minutes and then dehydrated. Then, it was dried in a dryer at 100 ° C. for 1 hour to obtain a water repellent treated wood powder 1.

Water-repellent treated wood powder 2 Neutral sizing agent uniformly mixed (Alkyl ketene dimer manufactured by Arakawa Chemical Co., Ltd .: trade name "Size Pine K-903")
To 100 parts by weight of an aqueous solution containing 1% by weight, 2 parts by weight of pulverized powder of wood waste materials for building materials (manufactured by Otomo Chemical Co., Ltd .: 80-mesh passing wood powder) was added, and after mixing for 10 minutes with an Eirich mixer,
It was dehydrated and dried in a dryer at 100 ° C. for 1 hour to obtain a water repellent treated wood powder 2.

Water-repellent treated wood flour 3 A neutral sizing agent that is uniformly mixed (Alkyl ketene dimer manufactured by Arakawa Chemical Co., Ltd .: trade name "Size Pine K-903")
1% by weight and 2% by weight of polyamide polyamine-based cationic polymer (Arakawa Chemical Co., Ltd .: trade name "AF-100")
To 100 parts by weight of an aqueous solution containing 2 parts by weight, 2 parts by weight of pulverized wood waste wood for building materials (manufactured by Otomo Chemical Co., Ltd .: 80-mesh passing wood powder) was added, mixed for 10 minutes with an Eirich mixer, and then dehydrated 1
Water-repellent treated wood powder 3 was obtained by drying in a dryer at 00 ° C for 1 hour.

Water-repellent treated wood powder 4 Uniformly mixed wax-based sizing agent (paraffin wax manufactured by Arakawa Chemical Co., Ltd .: trade name "Size Pine W-116"
H ") 2 parts by weight of pulverized wood waste wood materials for building materials (manufactured by Otomo Chemical Co., Ltd .: 80-mesh wood powder) is added to 100 parts by weight of an aqueous solution containing 4% by weight, and the mixture is mixed with an Erich mixer for 10 minutes and then dehydrated. Then, it was dried in a dryer at 100 ° C. for 1 hour to obtain water-repellent treated wood powder 4.

Untreated wood powder Ground wood waste wood powder for building materials (manufactured by Otomo Chemical Co., Ltd .: 80 mesh passed wood powder) was used as it was.

Rosin-based sizing agent-treated wood powder 0.2% by weight of a uniformly mixed rosin-based sizing agent (manufactured by Arakawa Chemical Co., Ltd .: "Size Pine E"), Al ₂ (SO
_{4) 3} · 18H aqueous solution 100 containing ₂ O 0.2 wt%
In the weight part, pulverized powder of wood waste materials for building materials (Otomo Chemical Co., Ltd .: 8
2 parts by weight of 0 mesh passing wood powder) was added, mixed with an Erich mixer for 10 minutes, dehydrated and dried in a dryer at 100 ° C. for 1 hour to obtain a rosin-based sizing-treated wood powder.

(2) Manufacture of cured inorganic material The prescribed amounts shown in Table 1 of ordinary Portland cement, the above wood flour, water and other additives were put in a mixer and mixed, and the resulting mixture was fed with a screw diameter of 100 mm. Extruded from the mold with the extruder of, cut this, width 500m
A plate-shaped hydraulic inorganic molded body having m, a length of 50 mm and a thickness of 6 mm was obtained. This hydraulic inorganic molded product was treated at 60 ° C. and 90 ° C.
After curing for 6 hours in the curing chamber of% RH, the cured product was taken out from the curing chamber to obtain an inorganic cured product.

The following additives were used. That is, Shirasu balloon (manufactured by Nippon Philite Co., Ltd .: trade name “F
G ", specific gravity 0.7), pearlite (extrusion grade manufactured by Mitsui Mining & Smelting Co., specific gravity 0.3), organic microballoons (Matsumoto Yushi-Seiyaku Co., Ltd .: trade name" F-50E ", specific gravity 0.0)
3), vinylon fiber (Kuraray, length 6 mm, diameter 14
μm), antigorite (manufactured by Yutaka Sangyo Co., Ltd .: trade name “Mamabeston RF”, average particle size 46 μm), fly ash (manufactured by KANDENKA CORPORATION, specific gravity 2.0), hydroxypropylmethylcellulose (2% aqueous solution at 20 ° C.). Viscosity of 1500 cps). The extrusion pressure was measured with a pressure gauge attached to the taper barrel of the mold.

(3) Evaluation of cured inorganic material The obtained cured inorganic material was tested for specific gravity, bending strength, nailing workability, and freeze-thaw properties, and the results are shown in Table 1 together.

The test method is as follows. Specific gravity The weight of the obtained inorganic cured product was measured and divided by the volume. Bending strength The obtained inorganic cured body is cut to prepare a test piece having a length of 150 mm, a width of 40 mm and a thickness of 20 mm.
It measured according to the method of 1408.

Nail driving test A 40 mm long stainless screw nail nail was driven into the obtained inorganic cured body until it penetrated, and the distance from the edge where cracks and the like did not occur was measured. In the column of nailing workability in Table 1, the fact that the nailing work could not be performed is shown by x. Freeze-thaw property Regarding the obtained inorganic cured product, ASTM C-666
It measured according to the A method.

[0048]

[Table 1]

[0049]

EFFECTS OF THE INVENTION Since the hydraulic inorganic composition of the present invention has the above-mentioned constitution, it is excellent in lightness and nailing workability, and also has a decrease in strength and a decrease in freeze-thaw property. It can be preferably used as a raw material for producing an inorganic cured body.

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Claims (1)

[Claims] 1. A water-based inorganic substance, 100 parts by weight, 0.5 to 20 parts by weight of wood powder that has been water-repellent treated with a wax-based sizing agent or a neutral sizing agent, and 20 to 100 parts by weight of water. A hydraulic inorganic composition characterized by: