JPH08132417A - Manufacture of hydraulic inorganic molding - Google Patents

Abstract

PURPOSE: To realize shaping with less amount of water even in a system, in which reinforcing fibers and water-soluble polymer substance are added, by a structure wherein a stock feeding hopper is provided at a portion facing to one part of the rotating parts of a barrel and a pouring port, through which liquid is poured to a portion facing to the other part of the rotating parts, is provided. CONSTITUTION: Solid stocks are supplied from a hopper 21 to a first rotating part. Since all the stocks supplied from the hopper 21 are solid, the stocks have good fluidity and a large amount of the stocks supplied from the hopper 21 are smoothly supplied to a second rotating part 6, even when reinforcing fibers are added to the compact stock. Further, at the second rotating part 6, though water is poured from a nozzle 22, since the second rotating part 6 has kneading function, no fluidity is impaired by the pouring of water and the mixing and kneading between the water and other stock mixture is realized so as to obtain uniform hydraulic inorganic composition.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a hydraulic inorganic material molded body.

[0002]

2. Description of the Related Art A cured product obtained by molding and curing a molding material containing a hydraulic inorganic substance such as cement, mortar and gypsum and water has been suitably used for various structural materials since ancient times.
In order to produce such a cured product, a hydraulic inorganic composition is extrusion-molded by an extrusion molding method to obtain a hydraulic inorganic molded product, and then a method of curing and curing this hydraulic inorganic molded product is productive. Excellent in terms of However, in the extrusion molding method, since fluidity is particularly required for the hydraulic inorganic composition, in order to secure the fluidity, the hydraulic property obtained by adding a large amount of water to the hydraulic inorganic substance is obtained. Inorganic compositions have been used.

[0003] However, when a hydraulic inorganic molded body molded using such a hydraulic inorganic composition containing a large amount of water is cured, excess water forms voids in the cured body,
There was a problem that the strength, water resistance, etc. of the cured product were lower than when a hydraulic inorganic composition containing only the minimum amount of water necessary for curing was used. Further, in order to improve the strength of the cured product, reinforcing fibers may be added to the hydraulic inorganic composition, but when the reinforcing fibers are added to the hydraulic inorganic composition in this manner, the reinforcing fibers are a matrix. It is necessary to sufficiently mix and knead the hydraulic inorganic composition so that it is uniformly dispersed therein.

Therefore, as a method for obtaining a high-strength fiber-reinforced inorganic cured product in which reinforcing fibers are uniformly dispersed and mixed with a smaller amount of water, the material is continuously rotated by rotating the barrel and the barrel in the radial direction of the barrel. It consists of a pair of long rotating body that pushes out in a positive direction.
A first rotating part having a function of supplying the material, a second rotating part having a function of kneading the material, a third rotating part having a function of compressing the material, and a third rotating part having a function of measuring the material. The present applicant has previously proposed a method (Japanese Patent Laid-Open No. 6-218722) for continuously producing a hydraulic inorganic material molded body by using an extruder having a plurality of rotating parts including four rotating parts. ing.

That is, in the above-mentioned extruder, from the hopper which is a raw material supply port provided in the first rotating portion, all the raw materials are simultaneously mixed and kneaded together with the minimum necessary amount of water without being mixed and kneaded in advance. To the second rotating part quantitatively while mixing the raw material in the first rotating part, while the second rotating part sufficiently disintegrates the reinforcing fibers in the raw material and makes it uniform with other raw materials. To be a hydraulic inorganic composition. And the second
The hydraulic inorganic composition obtained in the rotating part of, the compressing stress in the third rotating part, by reducing the volume of the material as it goes in the feed direction of the extruder by applying shear stress, increase the filling rate, The hydraulic inorganic composition is weighed and extruded quantitatively by the fourth rotating part.

[0006] The extruded molded product can be a dense and high-strength cured product because the hydraulic inorganic composition contains only a small amount of water necessary for curing the hydraulic inorganic substance.

[0007]

However, in the case of the above-mentioned method, although it is an excellent method which certainly has the above-mentioned effects, the fluidity of the composition is poor until the raw materials are sufficiently mixed. If a large amount of raw material containing water is supplied to the first rotating portion at one time, the raw material containing water is clogged at the inlet of the first rotating portion, and water or other raw material flows backward from the hopper and overflows. Therefore, there is a problem that the raw material carrying capacity of the first rotating unit cannot be fully utilized and the processing amount per unit time is limited.

In particular, in a system in which a water-soluble polymer substance is further added to the raw material in order to improve the fluidity of the composition, the proportion of the water-soluble polymer substance tightened in the entire raw material of the molded body. However, even if a water-soluble polymer substance is added to and mixed with a large amount of raw material for a molded body containing water, a water-soluble inorganic composition in which the water-soluble polymer is uniformly dispersed and mixed is obtained. Hateful. Therefore, when extrusion molding is continuously performed, the fluidity may vary depending on the time and place of extrusion, which may cause a problem in shapeability.

In view of the above circumstances, the present invention provides a system in which a reinforcing fiber or a water-soluble polymer substance is added, regardless of the amount of the hydraulic inorganic substance composition supplied, with a smaller amount of water. It is an object of the present invention to provide a method for producing a hydraulic inorganic material molded body, which can be shaped, the molded body is densified, and a cured product having high strength can be obtained.

[0010]

In order to achieve such an object, the invention described in claim 1 (hereinafter referred to as "present invention 1").
The method for producing a hydraulic inorganic substance molded body according to
A barrel and a pair of long rotary members that rotate in the barrel radial direction to continuously push out the material. The long rotary member has a function of supplying the material toward the extrusion direction. Extrusion having one rotating part, a second rotating part having a function of kneading a material, a third rotating part having a function of compressing a material, and a fourth rotating part having a function of weighing a material. In a method for producing a hydraulic inorganic molded body, in which a molded body raw material comprising at least a hydraulic inorganic substance and water is supplied to a machine and extrusion molded, a hopper for supplying a raw material to a portion of the barrel facing the first rotating portion. Is provided, an injection port for injecting a liquid is provided in a portion facing the second rotating portion, and raw materials other than water are supplied from the hopper to water from the nozzle into the barrel, respectively.

On the other hand, the method for producing a hydraulic inorganic molded body according to the invention described in claim 2 (hereinafter referred to as "present invention 2") is a barrel and the material is rotated in the barrel in the radial direction of the barrel. A pair of long rotating bodies for continuously pushing out the first rotating portion having a function of supplying the material toward the extruding direction, and a second rotating portion having a function of kneading the material. At least a hydraulic inorganic substance in an extruder having a rotating part of, a third rotating part having a function of compressing a material, and a fourth rotating part having a function of measuring a material.
In a method for producing a hydraulic inorganic molded body in which a molded body raw material composed of a water-soluble polymer substance and water is supplied and extrusion-molded, a hopper for supplying a raw material is provided in a portion of the barrel facing the first rotating portion, An injection port for injecting a liquid is provided in a portion facing the second rotating portion, and raw materials other than water and the water-soluble polymer substance in the raw material of the molded body are mixed with water and the water-soluble polymer substance from the hopper. The aqueous solution of the water-soluble polymer substance was supplied from the nozzle into each barrel.

In the constitution of the present invention 1, as the raw material for the molded body, besides the hydraulic inorganic substance and water, for example, an inorganic filler, a reinforcing fiber, a water-soluble polymer substance or the like can be appropriately added. In the configuration of the present invention 2, as the raw material for the molded body, in addition to the hydraulic inorganic substance, the water-soluble polymer substance and water, for example, an inorganic filler, a reinforcing fiber or the like can be appropriately added.

The hydraulic inorganic substance used in the present invention is not particularly limited as long as it is an inorganic substance which shows a hardening property when kneaded with water. For example, plain portland cement, special portland cement, alumina cement, roman cement, etc. Cement, acid-resistant cement, fire-resistant cement, water glass cement and other special cement, gypsum, lime, magnesia cement and other air-hardening cement, etc. are particularly preferred, and Portland cement and alumina cement are preferably used in terms of strength and water resistance. To be done. These may be used alone or in combination of two or more.

The water-soluble polymer substance used in the present invention is
Dissolves in water to give viscosity, improves fluidity of a composition obtained from a hydraulic inorganic substance and water to improve shapeability, and absorbs excessive water in the hydraulic inorganic composition to absorb water. There is no particular limitation as long as it is a polymeric substance that can serve as a binder for filling the voids between the hard inorganic substance particles, and examples thereof include cellulose ethers such as methyl cellulose, hydroxymethyl cellulose, hydroxyethyl cellulose, carboxymethyl cellulose, and hydroxypropyl methyl cellulose, polyvinyl alcohol, polyacrylic acid. , Lignin sulfonate and the like. If the amount of the water-soluble polymer substance added increases, the water resistance of the finally obtained cured product may decrease, so 5 parts by weight or less is preferable with respect to 100 parts by weight of the hydraulic inorganic substance.

The inorganic filler used in the present invention does not dissolve in water, does not inhibit the curing reaction of the hydraulic inorganic substance, and remarkably inhibits the action of any molded material used in the production method of the present invention. It is not particularly limited as long as it does not include, for example, aggregate for cement mortar such as silica sand and river sand, mixture material for mixed cement such as fly ash, silica flower, silica fume, bentonite, blast furnace slag, sepiolite, wollastonite, mica. Natural minerals such as, calcium carbonate, diatomaceous earth and the like.
Further, for the purpose of reducing the weight, silica foam, perlite, fly ash balloon, shirasu balloon, glass balloon, inorganic foam such as foamed clay may be used. These may be used alone or 2
You may use together 1 or more types.

The above-mentioned inorganic filler preferably has an average particle size of about 0.03 to 500 μm, because handling becomes difficult as the particle size becomes smaller and dispersibility thereof becomes worse as the particle size becomes larger. When the amount of the above-mentioned inorganic filler decreases, the dispersibility of the reinforcing fiber decreases, and when the amount increases, the strength of the finally obtained cured product decreases, so the hydraulic inorganic substance 10
2 to 200 parts by weight is preferable with respect to 0 parts by weight.

As the reinforcing fiber used in the present invention, any reinforcing fiber can be used according to the performance to be imparted to the molded body. For example, synthetic fibers such as vinylon, polyamide, polyester, polypropylene, carbon and aramid, inorganic fibers such as glass, potassium titanate and steel, natural fibers such as pulp and hemp can be used. Particularly when synthetic fibers are used, the flexibility is remarkably improved.

If the fiber diameter of the above-mentioned reinforcing fiber becomes thin, it will be re-aggregated during mixing and fiber balls will be easily formed by entanglement, the strength of the finally obtained cured product will not be improved, and if it becomes thick or short, it will be reinforced. The effect is small, and if it is long, the dispersibility and orientation of the fiber may deteriorate. Therefore, the fiber diameter is 0.5 to 40 denier and the fiber length is 1
It is preferably about 15 mm.

If the amount of the reinforcing fiber added is small, the reinforcing effect cannot be obtained, and if the amount is large, the dispersibility of the fiber may be deteriorated. The addition amount is preferably about 20 parts by weight. The method of quantitatively supplying the raw material to the extruder is not particularly limited, and any conventionally known method can be used, for example, a screw feeder, a circle feeder, or the like is used.

The amount of the raw material for the molded body to be fed varies depending on the barrel diameter of the extruder, but if the amount is too small or too large, the composition may not be sufficiently kneaded. , The total amount of the raw material for the molded body is 100 to 6
00 kg / hr is preferred. Water used in the present invention, when the addition amount is small, the curing of the hydraulic inorganic substance is not sufficient, and the dispersibility of the other molded material is lowered, and when it is increased, the hardness of the finally obtained cured body is increased. Since the strength may be reduced, it is preferable to add 15 to 60 parts by weight to 100 parts by weight of the hydraulic inorganic substance,
More preferably, the amount added is 20 to 40 parts by weight.

The method for quantitatively supplying water or an aqueous solution of a water-soluble polymer to the extruder is not particularly limited, and any conventionally known method can be used, for example, a tubing pump, a uniaxial screw type. A pump, a magnet pump, a diaphragm type metering pump, a metering pulse pump, etc. can be used. In the present invention 1 and the invention 2, the nozzle for supplying water or the aqueous solution of the water-soluble polymer substance is within 3/4 of the total length of the second rotating portion from the starting end portion of the second rotating portion toward the extrusion direction. It is preferably provided in a position.

That is, when the nozzle is provided on the side of the first rotating portion, the raw material cannot be quantitatively sent to the second rotating portion,
When the nozzle is provided in the third rotating part, the other raw material mixture in a dry state stays in the second rotating part and flows back to the first rotating part, or the second rotating part is overloaded and rotates. Will not do. The method for producing a molded article of the present invention is described in JP-A-6-2187.
It is possible to use the extruder proposed in Japanese Patent Laid-Open No. 22-22, and even if the hydraulic inorganic material composition discharged from the fourth rotating part is supplied into an extrusion die having a desired shape and shaped. Alternatively, the hydraulic inorganic material composition discharged from the fourth rotating portion may be fed into a press die having a desired shape for press molding.

In order to obtain a cured product from the molded product of the present invention, natural curing may be carried out for a long time, but when a hydraulic inorganic substance such as Portland cement having a slow curing reaction is used. The curing reaction can be promoted and mechanical properties can be improved by performing curing by a conventionally known method such as autoclave curing in which the molded body is heated and humidified.

[0024]

According to the structure of the present invention 1, first, the raw material other than water in the raw material of the molded body, that is, the solid raw material is supplied from the hopper to the first rotating portion. Since the raw material supplied from the hopper is all solid, it has good fluidity, and even if the raw material of the molded body contains reinforcing fibers, the raw material supplied in large quantity from the hopper can smoothly Is supplied to the rotating part of.

In the second rotating part, water is injected from the nozzle. Since the second rotating part has a function of kneading, even if water is injected, fluidity is not impaired. And other raw material mixture are mixed and kneaded to form a uniform hydraulic inorganic composition. Moreover, even in the system to which the water-soluble polymer substance is added, the water-soluble polymer substance is pre-mixed with the other solid components in the first rotating portion, so that water is injected in the second rotating portion. Even in this case, the water-soluble polymer substance is uniformly dispersed into a hydraulic inorganic composition.

This hydraulic inorganic composition comprises a third rotating part,
Sequentially sent to the fourth rotating part, which is quantitatively extruded into a dense hydraulic inorganic composition containing only a small amount of water,
It is molded with a mold. Since the obtained molded body contains a small amount of water and has a uniform composition, when it is cured by curing, it becomes a dense and excellent cured body.

On the other hand, according to the constitution of the present invention 2, since the water-soluble polymer substance is also dissolved in water and is supplied to the second rotating part together with water in the state of an aqueous solution, a more uniform hydraulic inorganic composition. And is pushed out quantitatively and smoothly.

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the drawings showing the embodiments thereof. Example 1 An extruder 1 shown in FIGS. 1 and 2 was prepared. As shown in FIG. 1, the extruder 1 is composed of a barrel 2 and a pair of long rotating bodies 3 and 3 that rotate in the barrel 2 in the radial direction of the barrel 2 to continuously push out the material. .

The long rotator 3 moves toward the extrusion direction,
A first rotating part 5 having a function of supplying the material, a second rotating part 6 having a function of kneading the material, a third rotating part 7 having a function of compressing the material, and a function of weighing the material. And a fourth rotating portion 8 having A hopper 21 is provided at the starting end portion of the first rotating portion 5 of the barrel 2, and a nozzle 22 is provided at a position 50 mm from the starting end portion of the second rotating portion 6.

The diameter of the nozzle 22 is 10 outside the barrel 2.
mm, 5 mm at the inner end of the barrel 2, and is devised so that the compressed liquid can be supplied to the second rotating portion 6. The first rotating part 5 includes a screw 5 having a total length of 150 mm on the outer circumference of the rotating shafts 31, 31 rotating in the barrel 2.
1 is formed. The screw 51 is provided with a flight.

The second rotating portion 6 is the paddle 6 shown in FIG.
1, 61 are fitted and fixed to the rotary shafts 31, 31. The paddles 61, 61 are 100 m in the radial direction of the extruder.
It has a length of m, and while changing the angle in 45 ° increments so that the apex becomes a substantially spiral line in the extrusion direction of the extruder, 4
The total length is 125 mm.

The paddles 61, 61 rotate with a phase difference of 90 ° so that one apex always rubs the other apex, and the paddles 61, 61 and the barrel 2 have a phase difference of 0.
It has a space of 1 mm. In the third rotating portion 7, the paddles 71, 71 are fitted and fixed to the rotating shafts 31, 31 similar to those of the second rotating portion 6. Like the paddles 61, 61 of the second rotating section, the paddles 71, 71 are configured by combining 10 sheets so that the tops thereof are alternately perpendicular to the extrusion direction of the extruder 1, and the total length is 313 mm. ing.

In the fourth rotating portion 8, the paddles 81, 81 having the same sectional shape as the second rotating portion 2 have rotating shafts 20, 2.
1 is fitted and fixed. The paddle 81 has a substantially spiral strip at the top in the extrusion direction, and is constructed by combining nine sheets while changing the angle so that the top becomes continuous in the extrusion direction, and has a total length of 282 mm. That is, the screw 51 and the paddles 61, 71, 81 are adapted to rotate as the rotary shaft 31 rotates.

The long rotating bodies 3 and 3 of the extruder 1 are set to 60 rp.
While rotating at a rotation speed of m, while forming raw materials other than water,
That is, ordinary Portland cement (manufactured by Onoda Cement Co., Ltd.), fly ash (average particle size 100 μm, true specific gravity 2.3, bulk specific gravity 0.6; conforming to JIS A 6201), hydroxypropyl methylcellulose (2% aqueous solution at 20 ° C.). Viscosity of 30,000 cps),
A polypropylene fiber having a fiber length of 3 mm (trade name: 3F-EX manufactured by Tesac Co., Ltd.) was supplied from the hopper 21 to the first rotating unit 5. In addition, each raw material is fed to the hopper 21 with a screw feeder (not shown) for ordinary Portland cement 2
05 kg / hr, fly ash 80 kg / hr, hydroxypropyl methylcellulose 4 kg / hr, and polypropylene fiber having a fiber length of 3 mm and 5 kg / hr were fed by a circle feeder.

The molding material other than water supplied to the first rotating part 5 in this manner was quantitatively transferred to the second rotating part 6 while being stirred by the screw 51 having a flight. On the other hand, to the second rotating part 6, a mono-screw type pump, Mono pump (manufactured by Hyōjin Equipment Co., Ltd., model: 3NE0
8H2) was used to supply water from the nozzle 22 at a supply rate of 41 kg / hr.

In the second rotating part 6, the supplied water is supplied from the first rotating part 5 to the screw 5 by the paddles 61, 61.
1 was mixed and kneaded with the raw material of the molded body other than water to form a uniform hydraulic inorganic composition, the residence time in the extruder and the internal pressure were adjusted, and the mixture was supplied to the third rotating section 7. . In the third rotating part 7, compressive stress and shear stress are further applied to the hydraulic inorganic material composition, the volume of the composition decreases as it goes in the feeding direction of the extruder 1, and the filling rate is increased. 4 to the rotating unit 8. In the fourth rotating portion 8, the hydraulic inorganic substance composition was quantitatively extruded from the discharge port 9 of the extruder 1.

The hydraulic inorganic substance composition thus extruded from the discharge port 9 is fed into the press die to obtain 20 kg.
Press molding was performed for 5 seconds at a pressure of / cm ² to obtain a plate-shaped molded body having a thickness of 5 mm. The obtained molded body was cured at 60 ° C. and 100% RH for 6 hours to obtain a cured body. The bending strength of the obtained cured product was measured according to JIS A 1408 and was 290 kg / cm ² . Further, when the obtained molded body was placed along a pipe having a radius of 11 mm, the state of the molded body was visually observed and checked for cracks. As a result, the molded body was partially cracked.

(Example 2) Extruder 1 used in Example 1
In place of the nozzle 22 from the starting end of the second rotating portion 6
It is installed at a position of 0 mm, and a 100 mm barrel and a screw provided with a flight inside the barrel are continuously inserted between the fourth rotating part 8 and the discharge port 9, and further 100 mm in the extrusion direction at the outlet of the barrel. A flat plate-shaped molded product under the same conditions as in Example 1 except that a die having a parallel portion of 200 mm in width and an outlet shape of 200 mm in height and 10 mm in height was continuously formed and extruded at an extrusion pressure of 23 kg / cm ^2. Got The obtained molded product was used in Example 1.
Curing was carried out in the same manner as above to obtain a cured product. The bending strength of the obtained cured product in the extrusion direction and the bending strength in the direction perpendicular to the extrusion direction were measured according to JIS A 1408, and it was 280 kg / cm ^{2 in} the extrusion direction and 275 kg / cm ² in the direction perpendicular to the extrusion direction. there were.

(Example 3) The same conditions as in Example 2 except that an extruder in which the nozzle 22 was provided at a position 80 mm from the starting end of the second rotating portion 6 was used in place of the extruder in Example 2. Then, the hydraulic inorganic substance composition was extruded into the mold to obtain a flat-plate shaped body. The obtained molded body was cured in the same manner as in Example 1,
A cured product was obtained. JIS A
When measured according to 1408, it was 27 in the extrusion direction.
^{6kg / cm 2, 271kg / cm} 2 in the extrusion direction and perpendicular direction
Met.

(Embodiment 4) An extruder in which the nozzle 22 is provided at a position 50 mm from the starting end of the second rotating portion 6 is used in place of the extruder of the embodiment 2, and a long rotating body of the extruder 1 is used. While rotating 3 and 3 at a rotation speed of 100 rpm, 350 kg / hr of ordinary Portland cement (manufactured by Onoda Cement Co., Ltd.) and fly ash (average particle size 10
0 μm, true specific gravity 2.3, bulk specific gravity 0.6; JIS A
6201) 140 kg / hr, hydroxypropyl methylcellulose (viscosity of 2% aqueous solution at 20 ° C is 3
It is supplied with a screw feeder at a supply rate of 7.2 kg / hr and has a fiber length of 3 mm and is a polypropylene fiber (manufactured by Tesac Co., trade name; 3F-EX).
It was supplied using a circle feeder at a supply rate of 8.5 kg / hr, and water was supplied from the nozzle 22 at a rate of 105 kg / hr using a MONO pump (manufactured by Hyojin Equipment Co., Ltd., model: 3NE08H2). A molded body was obtained in the same manner. The obtained molded body was cured at 60 ° C. and 100% RH for 6 hours to obtain a cured body. The bending strength of the obtained cured product is determined by JI
When measured according to S A 1408, it was 286 kg / cm ^{2 in} the extrusion direction and 279 in the direction perpendicular to the extrusion direction.
It was kg / cm ² .

(Example 5) Ordinary Portrad cement (manufactured by Onoda Cement Co., Ltd.) 350 kg / hr, fly ash (average particle diameter 100 μm, true specific gravity 2.3, bulk specific gravity 0.6; J)
140 kg / hr (according to ISA6201), hydroxypropylmethyl cellulose (viscosity of 2% aqueous solution at 20 ° C. is 30,000 cps) 2.82 kg / hr with a screw feeder, polypropylene fiber with a fiber length of 3 mm (trade name, manufactured by Tesac) ; 3F-EX) 8.5 kg / hr
Is supplied to the hopper 21 by a circle feeder, and water is supplied to the nozzle by a mono pump (manufactured by Hyojin Equipment Co., Ltd .; model: 3NE08).
H2) was used and supplied at 91.2 kg / hr.
A molded body was obtained in the same manner as in Example 2.

The obtained molded body was cured at 60 ° C. and 100% RH for 6 hours to obtain a cured body. When the bending strength of the obtained cured product was measured according to JIS A 1408, it was 290 kg / cm ^{2 in} the extrusion direction and 285 kg / cm ² in the direction perpendicular to the extrusion direction. Further, when the obtained molded body was placed along a pipe having a radius of 11 mm, the state of the molded body was visually observed and checked for cracks. As a result, the molded body was partially cracked.

Example 6 In the hopper 21 of the extruder 1,
Ordinary Portland cement (manufactured by Onoda Cement Co., Ltd.) 205kg / hr with a screw feeder, fly ash (average particle size 100μm, true specific gravity 2.3, bulk specific gravity 0.6; JI
80 kg / hr (according to SA 6201) and polypropylene fiber with a fiber length of 3 mm in a circle feeder (manufactured by Tesac Co., trade name; 3F-EX) 5 kg / hr
And hydroxypropylmethyl cellulose (2% aqueous solution at 20 ° C has a viscosity of 30,000c
An aqueous solution of a water-soluble polymer substance prepared by dissolving it in water so that the concentration of ps) becomes 3% is 69 kg / hr using a MONO pump (manufactured by Hyojin Equipment Co., Ltd., model: 3NE08H2) in the nozzle 22. A molded body was obtained in the same manner as in Example 1 except that the supply was performed.

The obtained molded body was aged at 60 ° C. and 100% RH for 6 hours to obtain a cured body. When the flexural strength of the obtained cured product was measured according to JIS A 1408, it was 284 kg / cm ² . Further, when the obtained molded body was placed along a pipe having a radius of 11 mm, the state of the molded body was visually observed, and the presence or absence of cracks was examined. As a result, no cracks were found.

Example 7 Extruder 1 used in Example 1
In place of the nozzle 22 from the starting end of the second rotating portion 6
It is installed at a position of 0 mm, and a 100 mm barrel and a screw provided with a flight inside the barrel are continuously inserted between the fourth rotating part 8 and the discharge port 9, and further 100 mm in the extrusion direction at the outlet of the barrel. A flat plate-shaped molded product under the same conditions as in Example 6 except that a die having an outlet shape of 200 mm in width and a height of 10 mm was continuously provided and extrusion-molded at an extrusion pressure of 23 kg / cm ^2. Got

The obtained molded body was aged at 60 ° C. and 100% RH for 6 hours to obtain a cured body. The flexural strength of the obtained cured product was measured in accordance with JIS A 1408, 279kg / cm ² in the extrusion direction was 275 kg / cm ² in the extrusion direction and perpendicular direction. Further, when the obtained molded body was placed along a pipe having a radius of 11 mm, the state of the molded body was visually observed, and the presence or absence of cracks was examined. As a result, no cracks were found.

(Embodiment 8) A hydraulic inorganic material composition is placed in a mold under the same conditions as in Embodiment 6 except that the nozzle 22 is located 80 mm from the starting end of the second rotating portion 6. Extrusion was performed to obtain a flat plate-shaped molded body. The obtained molded body is 60
Curing was carried out at 100 ° C. and RH for 6 hours to obtain a cured product. The bending strength of the obtained cured product was measured according to JIS A 1408.
277kg / cm in the extrusion direction when measured according to
² , 274 kg / cm ² in the direction perpendicular to the extrusion direction. Further, when the obtained molded body was placed along a pipe having a radius of 11 mm, the state of the molded body was visually observed, and the presence or absence of cracks was examined. As a result, no cracks were found.

(Example 9) 350 kg / of ordinary Portland cement (manufactured by Onoda Cement Co., Ltd.) with a screw feeder
hr, fly ash (average particle size 100 μm, true specific gravity 2.
3, bulk specific gravity of 0.6; according to JIS A 6201) 1
40 kg / hr polypropylene fiber with a fiber length of 3 mm in a circle feeder (Tesak, trade name; 3F-EX)
8.5 kg / hr was supplied to each hopper 21, and the same aqueous solution as in Example 5 was supplied to the nozzle 22 at 94 kg / hr using a MONO pump (manufactured by Hyōjin Kikai Co., Ltd., model: 3NE08H2), and the extruder 1 was heated. A molded body was obtained in the same manner as in Example 6 except that the screw 51 was rotated at a rotation speed of 100 rpm.

The obtained molded body was aged at 60 ° C. and 100% RH for 6 hours to obtain a cured body. The flexural strength of the obtained cured product was measured in accordance with JIS A 1408, 283kg / cm ² in the extrusion direction was 278 kg / cm ² in the extrusion direction and perpendicular direction. Further, when the obtained molded body was placed along a pipe having a radius of 11 mm, the state of the molded body was visually observed, and the presence or absence of cracks was examined. As a result, no cracks were found.

Comparative Example 1 The same operation as in Example 1 was carried out except that all the raw materials including water were simultaneously supplied to the hopper 21 of the extruder 1 and nothing was supplied from the nozzle 22. However, the hydraulic inorganic material composition to which water is added,
It stayed in the first rotating part 5 and was not quantitatively supplied to the second rotating part 6 and thereafter, and a molded body could not be obtained.

(Comparative Example 2) The same operation as in Example 2 was carried out except that the nozzle 22 was provided at a position 110 mm from the starting end of the second rotating portion 6. However, the second rotating part 6 is filled with the hydraulic inorganic material composition in a dry state, the screw 51 of the extruder 1 is overloaded, the screw 51 does not rotate, and the hydraulic inorganic material composition is extruded. I couldn't.

Comparative Example 3 All raw materials including water are used in Example 1.
Except that it was supplied to the hopper 21 of the extruder 1 at the same time, and nothing was supplied from the nozzle 22.
A molded product was obtained by the same procedure as in Example 1. The obtained molded body was cured at 60 ° C. and 100% RH for 6 hours to obtain a cured body. The bending strength of the obtained cured product was measured according to JIS A 1
When measured according to 408, it was 280 kg / cm ² .

Further, when the obtained molded body was placed along a pipe having a radius of 11 mm, the state of the molded body was visually observed and checked for the presence of cracks. As a result, a large crack was partially generated. .

[0054]

EFFECTS OF THE INVENTION Since the method for producing a hydraulic inorganic molded article according to the first and second aspects of the present invention is configured as described above, water containing a homogeneous hydraulic inorganic composition even when the amount of supply is large. A hard inorganic molded body can be continuously and accurately obtained. Then, by curing and curing the obtained hydraulic inorganic molded body, it is possible to obtain a high-strength cured body excellent as a building material. Further, it is possible to freely change the amount of water or an aqueous solution of a water-soluble polymer substance added during extrusion, and it is also possible to change the flexibility of the hydraulic inorganic substance molded body and the strength of the resulting cured body. it can.

Moreover, even in a system containing a water-soluble polymer substance, the fluidity required for extrusion can be obtained by adding a small amount of the water-soluble polymer substance. Furthermore, according to the method for producing a hydraulic inorganic molded body of the present invention 2, the water-soluble polymer substance becomes a more uniform hydraulic inorganic composition in the second rotating part, and a molded body having more cracks is obtained. Thus, it is possible to obtain a cured product which is excellent not only in strength but also in appearance.

[Brief description of drawings]

FIG. 1 is a plan sectional view of a schematic view showing an example of an extruder used in the present invention.

FIG. 2 is a side view of a schematic view showing an example of an extruder used in the present invention.

FIG. 3 is a cross-sectional view taken along the line A-A ′ in FIG.

[Explanation of symbols]

 1 Extruder 2 Barrel 3 Long Rotating Body 5 First Rotating Part 6 Second Rotating Part 7 Third Rotating Part 8 Fourth Rotating Part 21 Hopper 22 Nozzle 51 Paddle

Claims (2)

[Claims] 1. A barrel and a pair of long rotating bodies that rotate in a radial direction of the barrel and continuously push out the material in the barrel. The long rotating body supplies the material in the pushing direction. A first rotating part having a function of mixing, a second rotating part having a function of kneading the material, a third rotating part having a function of compressing the material, and a fourth rotating part having a function of measuring the material.
In a method for producing a hydraulic inorganic molded body, in which a raw material for a molded body composed of at least a hydraulic inorganic substance and water is supplied to an extruder having a rotary part of the extruder, the first rotary part of the barrel is exposed. A hopper for supplying a raw material is provided in a portion, an injection port for injecting a liquid is provided in a portion facing the second rotating portion, and a raw material other than water is supplied into the barrel from the hopper and water from a nozzle, respectively. A method for producing a hydraulic inorganic material molded article, comprising: 2. A barrel and a pair of long rotating bodies that rotate in the barrel in the radial direction of the barrel and continuously push out the material. The long rotating body supplies the material in the pushing direction. A first rotating part having a function of mixing, a second rotating part having a function of kneading the material, a third rotating part having a function of compressing the material, and a fourth rotating part having a function of measuring the material.
An extruder having a rotating part of at least a hydraulic inorganic substance, a method for producing a hydraulic inorganic molded body in which a raw material for a molded body consisting of a water-soluble polymer substance and water is supplied and extrusion molded, A hopper for supplying a raw material is provided in a portion facing the rotating portion of No. 1 and an injection port for injecting a liquid is provided in a portion facing the second rotating portion, and a material other than water and a water-soluble polymer substance is contained in the raw material of the molded body. A method for producing a molded body of a hydraulic inorganic substance, characterized in that an aqueous solution of a water-soluble polymer substance, which is a mixture of water and a water-soluble polymer substance, is fed from a nozzle into a barrel through a nozzle.