JPH07227821A - Manufacture of fiber-reinforced cement construction material - Google Patents

Abstract

PURPOSE:To reduce the quantity of moisture to enhance a lamination efficiency when winding a seed film using a making roll, and ensuring an adequate moisture movement required for an interlayer adhesion when pressing, in a sheet making method or a flow-on winding molding method. CONSTITUTION:A seed film 1A is molded using a blend 1 of cement as a main component, a required quantity of slag, calcareous raw material, siliceous raw material, light-weight material, reinforcing fiber such as pulp and dry scrap, and water. In addition, the seed film 1A is taken up by a making roll 5 with a concurrent action to laminate the film 1A, and if a specified thickness is achieved, the roll is cut and flattened, and then is stretched and pressed into a plate-like form. In this method for manufacturing a fiber-reinforced cement construction material, water-absorbing polymer powder 7 is uniformly sprayed over the surface of the seed film 1A, and the film is laminated and at the same time taken up by the making roll 5 to mold a plate-like form. This step sequence is repeated in a continuous operation.

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 fiber-reinforced cement building material, and more particularly to an improvement in a method for producing a fiber-reinforced cement building material by a so-called papermaking method or a flow-on roll forming method.

[0002]

2. Description of the Related Art Conventionally, as a method for producing a fiber-reinforced cement building material, cement as a main component and a required amount of slag,
While forming a thin layer from a mixture of calcareous raw material, siliceous raw material, lightweighting material, reinforcing fiber such as pulp, fiber-reinforced cement mixture obtained by adding dry scrap and water, and laminating this on a making roll There are known a paper-making method in which a sheet is wound, cut to a predetermined thickness, flattened and pressed to form a plate-like body, or a flow-on winding-molding method.

In the above-mentioned manufacturing method, the paper-making method is such that a wire-mesh drum is immersed in a vat filled with a slurry prepared by mixing a fiber-reinforced cement mixture with a large amount of water, and is rotated to make a felt-made paper-making drum. A thin seed film is made into paper by contacting a belt, and the dehydrated upper seed film is transferred to a making roll to be wound and laminated. Is a method of forming a seed film by directly supplying a slurry having a low water content in layers on a felt belt, and thereafter winding and laminating it on a making roll as in the papermaking method.

[0004]

[Problems of the Prior Art] In the manufacturing method in which the seed film is wound and laminated on a making roll, structural defects are apt to occur between layers of the seed film wound on the making roll. There has been a problem that delamination during molding and swelling due to freezing damage and delamination phenomenon tend to occur when used as a product. That is, the interlayer adhesion of the seed film wound on the making roll is affected by the water content of the seed film, and the higher the water content, the more the water content between the layers that occurs during the winding and laminating or pressing causes the cement, etc. The material also moves between layers and the adhesion between layers is improved. However, if the amount of water increases, the seed film is crushed by the pressure when the stacking on the making roll progresses, and it becomes impossible to form the material to a desired thickness. On the other hand, if the water content of the seed film is reduced, the harmful effect of crushing the seed film on the making roll is reduced, but the movement of interlayer water during lamination on the making roll or at the time of pressing after cutting is reduced, and the interlayer adhesion is reduced. As a result of the lowering, there is a drawback that delamination is likely to occur.

[0005]

In view of the above problems, the present invention reduces the water content when the seed film is wound on a making roll to improve the lamination efficiency, and transfers the water content necessary for interlayer adhesion during pressing. The object of the present invention is to obtain an improved method for producing a fiber-reinforced cement building material capable of sufficiently performing the above.

[0006]

That is, the method for producing a fiber-reinforced cement building material of the present invention comprises cement as a main component,
A seed film is formed from a mixture of a required amount of slag, a calcareous raw material, a siliceous raw material, a lightweight material, a reinforcing fiber such as pulp, a fiber-reinforced cement compound consisting of dry scrap, etc., and water, and making it into a making roll. In the method for producing a fiber-reinforced cement building material, which is wound up while being laminated on top, and cut into a predetermined thickness, flattened and pressed to form a plate-like material, a water-absorbing polymer powder on the surface of the seed film. After being evenly dispersed, it is wound while being laminated on a making roll, and thereafter, a plate-like body is formed in the same manner as described above.

[0007]

The present invention includes the steps of forming a thin film on a belt, winding the thin film on a making belt, winding the film, cutting it to a predetermined thickness, flattening it and pressing it into a flat plate. Any of a papermaking method and a flow-on winding molding method can be applied as long as it is a method. In the above manufacturing method, the present invention is characterized in that the water-absorbent polymer powder is uniformly dispersed on the seed film wound on the making roll.

The water absorbing polymer powder has a very high water absorbing ability and absorbs 100 to 500 times its weight of water. Therefore, the water content of the seed film decreases due to the high water-absorbing ability of the water-absorbing polymer interposed between the layers of the seed film wound on the making roll. On the other hand, the water-absorbent polymer has a property that the absorbed water is difficult to be released even when pressure is applied. For this reason, water absorption is hardly released at about the pressure applied when the layers are wound up on the making roll, so that the collapse of the layered product due to the progress of layering is effectively prevented.

After laminating the seed film to a predetermined thickness in this way, it is incised, flattened and compressed by a press. However, since the pressing pressure is high, the water-absorbing polymer powder interposed between the layers is used. The absorbed water is released, and this water moves between the layers to improve the interlayer adhesion. That is,
The water-absorbing polymer powder interposed between the layers serves to absorb water during lamination and release water during pressing to improve efficiency during lamination and adhesion between layers during compression.

The above water-absorbent polymer powder is dried when the water content of the seed film is high, and when the water content of the seed film is reduced to some extent by a device such as a suction box, the water content of the water absorption polymer powder is reduced to that extent. Accordingly, the water-absorbed material is sprayed in advance.

[0011]

Embodiments of the present invention will be described below. (Embodiment 1) FIG. 1 is a side view showing a state in which the method of the present invention is carried out by a papermaking method. As shown in FIG. 1, a tank 2 ... 2 filled with a cement slurry 1 formed by mixing a fiber-reinforced cement mixture containing cement as a main component and a large amount of water.
3, a rotationally drivable gauze cylinder 3 ... 3, a felt belt 4 that can run in contact with the gauze cylinder 3, and a seed film 1A formed on the felt belt 4 are laminated. A papermaking machine consisting of a rotating making roller 5 was used.

When a plate-like body is formed by the above-mentioned apparatus according to a conventional method, the horizontal traveling portion 4 of the felt belt 4 is
A is provided with a hopper 6, from which water-absorbent polymer particles 7 with an average particle size of 110 microns are dried (sprinkle uniformly with a product name PQ polymer manufactured by Osaka Organic Chemical Co., Ltd. at 20 g / m ² , In this state, the seed film 1A was wound up and laminated on a making roll 5. The water content of the seed film in the portion where the water-absorbing polymer particles 7 were dispersed was 0.6% of water with respect to 1 weight of solid matter such as cement. It was a percentage.

When the thickness becomes 12 mm, a piano wire is cut from the making roll 5 and flattened, and then the developed laminated plate body 1B having a thickness of 12 mm, a width of 1.8 mm and a length of 6 m is 80 kg by a flat plate press 8. It was dehydrated by compression at a pressure of / cm ² . The obtained plate is 45 cm wide and 3 m long with a press cutter (not shown).
It was cut into a m-shaped plate and cured by autoclaving to obtain a test plate.

(Embodiment 2) FIG. 2 is a side view showing a state in which the method of the present invention is carried out by a flow-on winding method. As shown in FIG. 2, a flow box 2A for supplying a layered cement slurry 1 formed by mixing a fiber-reinforced cement mixture containing cement as a main component and water, and a cement slurry 1 supplied from the flow box 2A. The felt belt 4 which receives and runs as the seed film 1A, the suction boxes 4B ... 4B for dewatering and sucking the moisture of the seed film 1A on the felt belt 4, and the seed film 1A formed on the felt belt 4 are laminated. Making roll 5
A flow-on winding device consisting of and was used.

When a plate-like body is formed by the above-mentioned apparatus according to a conventional method, the horizontal traveling portion 4 of the felt belt 4 is formed.
A hopper 6 is provided on the starting end portion P of A as in Example 1, and the same water-absorbing polymer particles 7 in the same dry state as used in Example 1 are sprinkled from here, and the seed film 1A is made in this state. It was wound on a roll 5 and laminated. The water content of the seed film in the portion where the water-absorbent polymer particles 7 were sprayed was 0.56 of water to 1 of solids such as cement in a weight ratio.

When the thickness reaches 12 mm, the cutting roll 5 is incised with a piano wire and flattened.
The developed laminated plate body having a thickness of 12 mm, a width of 1.8 mm and a length of 6 m was compressed and dehydrated by a flat plate press 8 at a pressure of 80 kg / cm ² . The obtained plate is 45 cm wide and 3 m long with a press cutter (not shown).
It was cut into a m-shaped plate and cured by autoclaving to obtain a test plate.

(Embodiment 3) Using the same apparatus as in Embodiment 2, the end portion Q of the horizontal traveling portion 4A of the felt belt 4 is used.
In the same manner as in Example 1, a hopper 6 is provided, and water-absorbent polymer particles 7 which have been preliminarily absorbed so as to have a water-absorption weight of 100 relative to a dry weight of 1 are evenly dispersed from this, and in this state, the seed film 1A is made. It was wound on a roll 5 and laminated, and thereafter, a test plate was obtained in the same manner as in Example 2. The water content of the seed film in the portion where the water-absorbent polymer particles 7 were sprayed was 0.54 of water to 1 weight of solid matter such as cement.

(Comparative Example 1) A plate-like body was molded and cured under the same conditions as in Example 1 except that the water-absorbent polymer particles were not sprayed. (Comparative Example 2) A plate-like body was molded and cured under the same conditions as in Example 2 except that the water-absorbent polymer particles were not sprayed.

In the above manufacturing process, the laminated state of the seed film on the making roll 5 was observed.
Regarding No. 3, no crushing of the laminate was observed at all, but in Comparative Examples 1 and 2, some crushing of the laminate was observed, and the thickness of the plate body at the time of development was slightly smaller than 12 mm. Further, when the test plate after curing and curing was cut by a cutter and its cross section was observed, almost no stratified cross section was observed in Examples 1 to 3, whereas in the comparative example, the stratified cross section was clearly observed. Was observed.

Next, freeze-thaw tests were conducted on Examples 1 to 3 and Comparative Examples 1 and 2. The test condition is that the temperature is maintained at 20 ° C for 2 hours, then cooled down to -20 ° C over 6 hours, and the -20 ° C is maintained at 2
One cycle was to raise the temperature to 20 ° C. over 6 hours after maintaining for a period of time, and this was continuously repeated 200 cycles. As a result, in all of Examples 1 to 3, there was no abnormality, whereas in Comparative Examples 1 and 2, delamination was observed in 20% on average.

[0021]

As described above, according to the present invention, when a seed film is laminated on a making roll to form a plate, the water-absorbing polymer particles are laminated between layers of various films while being dispersed. Even if the seed film contains a large amount of water, the water absorption capacity of the seed film absorbs the water in the seed film, thus effectively preventing the crushing phenomenon due to excessive water content. Since the water contained in the molecular particles is appropriately released and contributes to the interlayer adhesion, there is an effect that a fiber-reinforced cement building material having a uniform density and having high strength and reliability that is free from adverse effects such as delamination and the like can be easily manufactured.

[Brief description of drawings]

FIG. 1 is a side view showing a state in which the method of the present invention is carried out by a papermaking method.

FIG. 2 is a side view showing a state in which the method of the present invention is carried out by a flow-on winding method.

[Explanation of Codes] 1 ... Cement slurry 1A ... Seed film 2 ... Tank 2A ... Flow box 3 ... Circular net cylinder 4 ... Felt belt 4A ... Horizontal running part of felt belt 4B ... Suction box for dehydrating and sucking water from seed film 5 ... Making roll 6 ... Hopper 7 ... Water-absorbing polymer particles

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Claims (1)

[Claims] 1. A mixture consisting of cement and a required amount of slag, a calcareous raw material, a siliceous raw material, a lightweight material, a reinforcing fiber such as pulp, a fiber-reinforced cement mixture including dry scrap, and water. More seed film,
In a method for manufacturing a fiber-reinforced cement building material, which is wound up while being laminated on a making roll, cut into a predetermined thickness, flattened and molded into a plate-like body,
After uniformly dispersing the water-absorbent polymer powder on the surface of the seed film, it is wound while being laminated on a making roll, and thereafter, a plate-like body is formed in the same manner as described above, and a method for producing a fiber-reinforced cement building material. .