JPH0474749A - Fiber mortar product - Google Patents

Abstract

PURPOSE:To make the aimed fiber mortar product incombustible and improve deflection resistance and strength by forming into a tubular or plate-like state using adhesive between laminates when a wet sheet consisting of a fiber mortar raw material and perforated paper are laminated. CONSTITUTION:An organic adhesive and/or inorganic adhesive are prepared. Wet sheet 2 consisting of a fiber mortar raw material and perforated paper are prepared. The above-mentioned adhesive is used between laminate consisting of the above-mentioned wet sheet 2 and perforated paper 1. Then the laminate is formed into tubular shape and sheet shape to provide the fiber mortar product having combustibility and simultaneously having excellent deflection resistance and strength.

Description

[Detailed Description of the Invention] Object of the Invention and Industrial Application Field] The present invention relates to a tubular or plate-shaped fiber mortar product for use as water supply and drainage pipes, ventilation pipes, electric lamp pipes, pipe fittings, boards, etc. .

[Prior Art] One type of fiber mortar product is called an asbestos mortar product, and the main raw material used is asbestos: Mortar-1
: 5 to 6 (weight ratio) is the standard formulation.

As is well known, asbestos is a fibrous material that tightly adheres and integrates with mortar, making it a suitable material for imparting bending strength and flexibility to pipes and plates.Moreover, as it is a non-combustible material,
It has been used effectively.

However, in recent years, asbestos-induced asbestosis has been pointed out and has become a social problem, and there has been a strong demand for asbestos removal from fiber mortar products.

Asbestos removal methods include inorganic fibers such as glass fiber, rock wool, slag wool, potassium titanate, wood valves,
Substitution with organic fibers such as wood wool and wood flour can be considered, but it is currently difficult to maintain the same strength and nonflammability as when asbestos is used.

Furthermore, in order to solve these problems, in fiber mortar pipes, for example, in fireproof double-layer pipes with PVC pipe inserted inside, which is the main use of fiber mortar pipes, fabrics made of organic material or artificial mineral fibers are used. Alternatively, a method has been devised (Utility Model Publication No. 62-894) in which the mat is impregnated with cement material and the PVC pipe inside is involved, but this method also has problems such as the complexity of the process and the increase in manufacturing costs. I have a point.

[Problems to be Solved by the Invention] The present invention was made to solve the above-mentioned problems. ■ To remove asbestos. ■ To achieve strength equal to or greater than asbestos mortar products made by the conventional wet papermaking method. To obtain a fiber mortar product that satisfies both of the following: non-combustibility; and ability to be manufactured at low cost. There is a particular thing.

1. Structure of the Invention [Means for Solving Problem 11] The present inventors previously disclosed in Japanese Patent Application No. 1-259411 that the adhesiveness between a wet sheet made of a fiber mortar raw material and the raw material is extremely excellent. We proposed a fiber mortar product in the form of a tube or plate, which is made by laminating at least one layer of high-strength, flame-retardant inorganic powder-containing paper.

As a result of further studies, the inventors of the present invention found that, even without using the above-mentioned inorganic powder-containing paper, it is possible to provide paper with perforations (hereinafter, paper with perforations provided therein is referred to as perforated paper). It has also been found that the desired performance can be obtained by using an organic adhesive and/or an inorganic adhesive between lamination with a wet sheet made of fiber mortar raw material.

We also found that when openings are provided in the paper containing the inorganic powder, the desired performance can be obtained without using the adhesive, and that the performance is significantly improved when an adhesive is used in conjunction with the paper. The invention has been completed.

That is, in the present invention, perforations are made in paper during and/or after the paper making process, and the wet sheet of fiber mortar raw material and the perforated paper are wound or formed into a tubular shape using an iron core or the like. Alternatively, by laminating them into a plate shape and then curing and hardening, it is possible to obtain a fiber mortar product that has excellent bending strength and flexibility, is inexpensive, and is nonflammable without using any asbestos.

In the case of apertured paper that does not contain inorganic powder, it is essential to use an organic adhesive and/or inorganic adhesive during lamination, but in the case of apertured paper that contains inorganic powder, It is carried out as appropriate depending on the required performance of the target product.

The shapes of the openings are round, oval, square, and rectangular.Rutland cement 67%, sand 20%, glass fiber 8%, and wood bulb 5% are dispersed in water to form a slurry. A wet sheet is formed on a wire mesh using a papermaking method.

The apertured paper used in the present invention is mainly composed of a fibrous material or a fibrous material and an inorganic powder. , synthetic fibers such as polyester, glass fibers, rock wool, slag wool, ceramic fibers,
It is made of inorganic fibers such as metal fibers, and one or more of these can be used as appropriate depending on the purpose.

When a fibrous material and an inorganic powder are used together, if the amount of the fibrous material is less than 5 parts by weight, the strength will be insufficient, so in the present invention, the amount of the fiber 11 is preferably 5 parts by weight or more.

Further, the inorganic powder is preferably a material that has excellent adhesion to the fiber mortar raw material, and is in the form of powder or short fibers.

The materials are carbonate, silica stone, silica sand,
Diatomaceous earth, wollastonite, aluminum silicate, pyrolune silicate, lath balloon, mica, bentonite, activated clay, china clay, waxite, sericite, feldspar, limestone, talc, cristobalite, natural zeolite, synthetic zeolite, Alumina, aluminum hydroxide, alumina gel, alumina gel, alumina gel, blast furnace slag, flier l
Nyu, bar light, sebi o light, ata pal
These include cement, Portland cement, and metals such as iron, steel, steel, and stainless steel.

The present inventors first evaluated the adhesion between these inorganic powder-containing papers and the cement kneaded material. That is, 67 parts by weight of Portland cement, 20 parts by weight of sand, 8 parts by weight of glass fibers, and 5 parts by weight of wood bulbs were kneaded, and the mixture was brought into close contact with paper (without holes) containing 40% by weight of the above-mentioned inorganic powder, and after curing. The adhesive strength of
Evaluation was performed using the point method, and the following results were obtained. Note that all of the inorganic powders not listed in the table below have an adhesion strength of 2.
It belongs to one of the three points.

Note 5 points: Strong adhesive strength and solid integration 4 points: Partially peeling off if removed by force 3 points: Adhesive but weak 2 Points that partially adhere 1 point; These inorganic powders do not adhere at all Among the paper containing paper, it was found that papers containing sepiolite, activated clay, calcium carbonate, halloysite-based cresilicate, and attapulgite have particularly excellent adhesion to fiber mortar raw materials. It was also found that if any of the inorganic powders were contained, the adhesion strength would be higher than that without any additives (black). The reason why the adhesion with the fiber mortar raw material increases as described above when inorganic powder is internally added is not well understood, but it is probably because the adhesive force of the inorganic powder to cement is greater than that of cellulose alone (black).

The present inventors conducted further studies based on the above results, and found that by providing perforations in paper (perforated paper) and laminating wet notebook made of fiber mortar raw material with perforated paper, organic It has been discovered that adhesion strength can be improved by using an inorganic adhesive or/and an inorganic adhesive.

The blending ratio of inorganic powder in the perforated paper is 5% compared to the perforated paper.
-95% by weight, preferably 50-85% by weight. The greater the amount of powder mixed in, the better the adhesion with the fiber mortar component in the sheet and the ability to impart flammability, but if the amount of inorganic powder mixed is 85% by weight or more, the strength of the paper will ,
In particular, the tensile strength decreases, and the bending strength of the pipe or plate using it decreases. In addition, if the overlap ratio is less than 50%, the above-mentioned strength can be provided, but the paper becomes easily flammable.

Perforated paper is manufactured using a paper machine after preparing the raw material slurry that mixes the fibers and powder described above, but in advance, marks for watermarks are placed on the wire mesh for paper manufacturing to obtain the desired perforations. It can be obtained by attaching the paper, making holes during the papermaking process, or making holes with a perforator after papermaking.

Further, in the present invention, auxiliary materials such as paper strength enhancers, sizing agents, colorants, etc. may be added as appropriate to the fiber mortar raw materials to be laminated or to the raw materials for inorganic powder-containing paper.

When providing apertures in paper, the porosity, aperture diameter, aperture shape, aperture arrangement, etc. affect the bending strength and flexibility of the fiber mortar product. For example, in the case of calcium carbonate paper, a fiber mortar pipe with a diameter of 10 cm has a diameter of 5 mm.
As a result of comparing the circular holes with 775 to 2,500 holes per m2, the maximum bending strength and flexibility were obtained when 1,500 holes were equally spaced. . In this way, it is necessary to appropriately determine the pore area, pore diameter, pore shape, pore arrangement, etc. so that the required amount of work (bending strength x deflection = amount of work) of the target pipe or plate is maximized. There is.

In the case of fiber mortar tubes, if the basis weight of the perforated paper becomes too large, the rigidity increases and it becomes difficult to wrap the paper in with the wet sheet, making delamination more likely to occur, whereas if it becomes too small, the spreadability on the wet sheet becomes 3. This will result in poor texture and wrinkles that will occur during winding, impairing workability.
5-200g/m2 preferably 70-120
g/m2 is used. In the case of fiber mortar boards, perforated paper of any basis weight can be selected depending on the desired strength.

Next, a method of laminating perforated paper on a fiber mortar wet notebook and forming it into a tube shape and a method of forming it into a plate shape will be described in detail.

The manufacturing method of fiber mortar pipes mainly uses Portland cement, aggregates such as sand, gravel, perlite, fiber materials such as glass fiber, rock wool, slag wool, valves, synthetic fibers, volcanic ash, flyano/yu, calcium chloride, etc. An admixture such as sodium silicate is appropriately mixed to form a wet sheet on a wire gauze of a wet paper machine.

At this time, in order to improve the yield of paper sheets such as aggregates, fixing agents, flocculants, or retention improvers commonly used in the paper manufacturing industry are used, and among fibrous materials, the softness of valves in particular is improved. Through control, the flexibility of the fiber mortar product can be increased or decreased.

Conventionally, a wet sheet layer of fiber mortar formed on a wire mesh was transferred onto a blanket while being dehydrated, and the wet sheet on the blanket was wrapped around an iron core or the like and formed into a tubular shape.
In the present invention, the apertured paper and the wet sheet are laminated in at least one layer, and then wrapped around an iron core or the like and formed into a tubular shape.

During lamination, it is also possible to use organic and/or inorganic adhesives, curing accelerators, etc., if necessary. Examples of organic adhesives include synthetic rubber latex such as SBR, MBR, and NBR, polyacrylic acid ester emulsion,
Polyvinyl acetate emulsion 9, polyvinyl chloride emulsion, polypinylidene chloride emulsion, starch, PVA
As the inorganic adhesive, any known inorganic adhesive such as water glass and cement dispersion can be used, and these alone or in combination are used during lamination by spraying, coating, etc. The amount used is adjusted as appropriate depending on the purpose, but it is usually 5 to 30 g/m
2 @ A fiber mortar pipe formed into a tubular shape becomes a product by curing and hardening.

On the other hand, for the fiber mortar board, the above-mentioned wet sheet is transferred from a blanket to a make-up roll, wrapped in one or more layers to the desired thickness, cut in the transverse direction, and then rolled out into a rectangular shape between the wet sheets. A perforated paper is inserted, heated and pressed in a multistage press, and then cured and cured to form a product. When laminating,
It is also possible to use a curing accelerator, organic/inorganic adhesive, etc., if necessary. In addition, forming into a corrugated plate shape or forming into a plate shape other than this may be performed as appropriate.

The method of forming and laminating the wet sheet is not limited to the paper making method, and the perforated paper may be inserted in several layers or more alternately with the wet sheet, and either one side of the tube or plate may be laminated. Some examples are listed below.

■ A board with a structure of 1 layer of fiber mortar (wet fiber mortar) / 1 layer of perforated paper / 1 layer of fiber mortar wet notebook ■ A board with a structure of 1 layer of perforated paper / 2 layers of fiber mortar wet sheet / 1 layer of perforated paper ■From the outer periphery, the tube consists of 5 layers of wet fiber mortar sheets / 1 layer of perforated paper / 1 layer of wet fiber mortar notebook / 1 layer of perforated paper / 5 layers of wet fiber mortar sheets ■From the outer periphery, 1 layer of perforated paper / In the case of a board, for example, a fiber mortar board having the structure (2) above can be used as shown in Figure 2. As shown in 3. Non-combustible paper on both sides. It is also used as a laminated noncombustible board.

Next, the present invention will be explained in more detail with reference to Examples, but the present invention is not limited to these Examples. Note that all weights indicate dry weight.

Example 1 FIG. 1 is a perspective view of the fiber mortar pipe of Example 1.

After mixing and dispersing 95 parts by weight of beaten softwood kraft valve and 5 parts by weight of glass fiber in 450 cc of Canadian Freeness, a small amount of wet paper strength agent was added, and holes with a basis weight of 100 g/m2 were made using a paper machine. I got paper 1. The holes are circular holes with a diameter of 6 mm on the paper wire mesh at a rate of 1.
Watermark marks were pasted at equal intervals so that 500 pieces were made, and paper was made.

This perforated paper was cut into a rectangle of 1 m x 2.2 m, and fiber mortar raw materials containing no asbestos (Portland cement 67%, sand 20%, glass fiber 8%, wood bulb 5%) were used. The mixture was sprayed with grilled acid ester emulzidine (trade name: Brimal M-30, manufactured by Nippon Acrylic Chemical Co., Ltd.) at a rate of 10 g/m2 on each side using a wet/human double-sided spray.Then, it was wrapped around an iron core with a diameter of 10 cm. It was molded, forcedly cured at 80° C. for 1 hour, and then naturally cured for 1 week to obtain fiber mortar grass with an outer diameter of 11.5 cm, an inner diameter of 10 cm, and a length of 2 m.

Example 2 After mixing and dispersing 45 parts by weight of beaten softwood kraft bulb into 450 cc of Canadian Freeness, 50 parts by weight of sepiolite with an average particle size of 5 μm, and 5 parts by weight of glass fiber, the mixture was agglomerated with a small amount of wet paper strength agent. A perforated paper with a basis weight of 100 g/m2 was obtained using a paper machine. The holes were made by pasting watermark marks at equal intervals on a wire mesh for paper making so that there were 1.500 circular holes with a diameter of 6 mm per square meter, and then paper was made. This perforated paper is cut into a rectangle of 1m x 2.2m (L), and this perforated paper is used as raw material for fiber mortar that does not contain asbestos (Portland cement 67% by weight, sand 20% by weight)
, an aqueous dispersion mixture of 8% glass fiber and 5% wood bulb) was laminated onto a 400g/m2 wet sheet obtained from the above, and then rolled around a 10cm diameter iron core and cured to form an outer diameter of 11.5cm and an inner diameter of 11.5cm. A fiber mortar tube with a length of 10 cm and a length of 2 m was obtained.

Example 3 In Example 2, a fiber mortar pipe was obtained in which carbonate powder having an average particle diameter of 15 μm was used instead of sepiolite.

Example 4 In Example 2, a fiber mortar tube was obtained using activated clay having an average particle diameter of 3 μm instead of sepiolite, and applying water glass liquid as an adhesive (coating amount: 12 g/m 2 ).

Comparative Example 1 A typical conventional fiber mortar pipe containing asbestos was manufactured by the following method.

i.e. 60% portland cement, 7% asbestos, 20% sand
%, 8% glass fiber, 4% obtained from wood bulb 5%
00 g/m2 wet sheet with a diameter of 10 cm,
A fiber mortar tube with an inner diameter of 10 cm and a length of 2 m was obtained.

Comparative Example 2 A fiber mortar pipe was obtained in Example 1 without using an adhesive during lamination.

Table 1. Measurement results of bending strength and flexibility of pipes: The test method is based on the bisecting point-line load method.

Example 25 A wet sheet obtained from a fiber mortar raw material containing no asbestos (same formulation as in Example 1) was transferred from the blanket of a circular paper machine to a mesh roll, and three layers were laminated to a thickness of 3. 3
After obtaining two wet sheets with a thickness of 4100 g/m 2 and a width of 4100 g/m 2 , the sheets were cut in the transverse direction and rolled out into a rectangular shape. In addition, after mixing and dispersing 95 parts by weight of beaten softwood kraft valve and 5 parts by weight of glass fiber in Canadian Freeness 430CC, a small amount of wet paper strength enhancer was added, and paper with a basis weight of 110 g/m2 was made using a paper machine. Obtained. Then, using the punching method, a square hole with a − side of 7 mm was made by 1 m21) t
, s O0 pieces of perforated paper were prepared at equal intervals.

Next, the apertured paper was inserted between the two wet sheets, and vinyl acetate emulsion (trade name:
20g of Polysol P-20 (manufactured by Showa Kobunshi Kagaku ■)
/m'! ! ! After processing, heat and pressure treatment is performed using a multi-stage press.
After curing for a week, it became 8mm thick.

A fiber mortar board with a width of 90 cm and a length of 1.8 m was obtained.

Example 6 2 of the same formulation as Example 1 with a basis weight of 4100 g/w2
Between the two wet sheets, the same material with a basis weight of 11 as in Example 2 was placed.
A perforated paper of 0 g/m2 was inserted, heated and pressurized using a multistage press, and cured for one week to obtain a fiber mortar board with a thickness of 8 mm.

Comparative Example 3 Comparative Example 1 with conventional typical asbestos-containing fiber mortar
Same formulation as (without using perforated paper) thickness 8
A fiber mortar board of mm was obtained.

Comparative Example 4 Between two wet sheets having the same formulation as in Example 1 and having a basis weight of 4,100 g 7 m2, a compound having the same formulation as in Example 2 was placed between
Sepiolite paper with a basis weight of 110 g/m2 without openings was inserted, and after heat and pressure treatment in a multistage press, it was cured for one week to obtain a fiber mortar board with a thickness of 8 mm, width of 90 cm, and length of 1.8 m. .

Table 2. Measurement results of bending strength and flexibility of the plate Note: The test method is based on the bisecting dotted line loading method.

C1 Effects of the invention The fiber mortar product of the invention is manufactured as described above and has the following effects.

0 Asbestos is not used, so there is no carcinogenicity.

■Compared to conventional products, it can have the same or higher bending strength and flexibility.

■ Even in a configuration where the perforated paper is exposed on the outside, the fiber mortar raw material is exposed from the perforations, spreads out, and becomes integrated, making it nonflammable and safe against fire.

■Since the structure is simple and the materials used are inexpensive, fiber mortar products can be manufactured at low cost.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional perspective view of a fiber mortar pipe according to an embodiment of the present invention, with part of it peeled off, and Fig. 2 is a part of a noncombustible board with noncombustible paper pasted on both sides of the fiber mortar board. 1 is a perforated paper; 2 is a perforated paper; 3. fiber mortar wet sheet (dry in case); indicates non-combustible paper.

Claims (1)

[Claims] (1) When laminating at least one layer of a wet sheet made of fiber mortar raw material and apertured paper containing no inorganic powder, an organic adhesive or/and an inorganic adhesive is applied to the wet sheet. A fiber mortar product characterized by being used between laminated layers of paper and perforated paper to form a tubular or plate shape. (2) A fiber mortar product characterized by laminating at least one layer of a wet sheet made of fiber mortar raw material and perforated paper containing inorganic powder into a tubular or plate shape. (3) The fiber mortar product according to claim 2, characterized in that an organic adhesive or/and an inorganic adhesive is used when laminating the wet sheet and the perforated paper. (4) The fiber mortar product according to Claims 2 and 3, wherein the inorganic powder is one or more selected from sepiolite, activated clay, calcium carbonate, halloysite clay, calcium silicate, and attapulgite.