JP2648248B2 - Papermaking method for ceramic building materials - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for making and manufacturing ceramic building materials.

[0002]

2. Description of the Related Art Conventionally, as a means for manufacturing and manufacturing ceramic building materials, a cement slurry in which cement, asbestos, necessary aggregate and water are mixed is taken up, wound around a making roll, and formed into a plate. A production method based on a papermaking method of cutting and developing and curing and curing is known. Asbestos mixed into the raw material slurry in this papermaking method also has the effect of improving the effect of making the cement slurry, improving the yield of the raw material for making the paper, making the density of the formed plate material uniform, and making the cement matrix densely structured. This has the advantage of contributing to However, asbestos fiber has been used as a substitute fiber because of the depletion of resources and the problem of pollution.

[0003]

[Problems of the prior art] However, after the construction, a ceramic building material comprising a fibrous material such as cement, a silica component and pulp and, if necessary, a lightweight aggregate such as perlite, scrap, etc., is gradually dried depending on the sun after construction. Dimensional changes occur due to repeated drying and wetting such as absorbing rainwater, and further shrinkage causes cracks in nailed parts, peeling of sealing, etc. There was a problem with stability.

[0004]

SUMMARY OF THE INVENTION In view of the above problems, the present invention provides a dimensional stability of a building material produced by a papermaking method using a cement slurry composed of cement, silica, reinforcing fiber, pearlite, lightweight aggregate, scrap and the like. The purpose of the present invention is to provide a method for producing a good ceramic building material.

[0005]

That is, in the method for producing a ceramic building material according to the present invention, a slurry is produced from a slurry for producing an inorganic plate mainly composed of cement and silica sand by a papermaking cylinder and transferred onto a belt. When a predetermined number of papermaking thin films are taken up on a making roll after dewatering, 0.5 to 50% of the solid content of the thin film material is placed on the thin film before and after being wound on the making roll.
It is characterized by adding 12% by weight of a nonionic surfactant.

[0006]

[Function] When ceramic building materials are used, drying due to the sun,
Shrinks due to repeated wetness caused by rain. This is because moisture is absorbed and released into the pores of the building material. Shrinkage is because surface tension is generated when moisture in the pores evaporates. The smaller the pores, the higher the surface tension and the greater the amount of shrinkage. To reduce shrinkage, the surface tension of water must be significantly improved. Surfactants are generally used to improve the surface tension of water. However, in the cement solution, various electrolytes are eluted, and in the case of cation and anion surfactants, the surface adsorption of reinforcing fibers, silica stones and the like is reduced, the surface wetting effect is poor, and gaps between matrix particles are generated,
It facilitates the absorption and release of moisture and causes shrinkage. The reason for limiting to nonionic surfactants is that there is no change in the wetting effect of the cement mixture depending on the electrolyte substance in the cement water.

When the amount of the nonionic surfactant added is 0.5 to 12% by weight based on the solid content of the slurry, if it is 0.5% or less, the shrinkage is large and the dimensional stability is poor. Also, when spraying 12% or more, the physical properties deteriorate. As the nonionic surfactant, a compound represented by the general formula R (CH ₂ .CH ₂ O) _m H
Among them, polyoxyethylene methyl ether [CH ₃ O. (CH ₂ .CH ₂ O) ₃ H] is excellent.

[0008] The reason why the surface active agent is added to the slurry is that the water content in the raw material changes due to the paper making and the suction box when the surfactant is added to the thin film before being wound on the making roll and on the thin film after the winding. This is because the loss is large. This is because it is most effective to apply it to the front and back of the dehydrated seed membrane just before winding. The concentration of the nonionic surfactant may be either a stock solution or a diluted solution. The application method may be spray application, flow coater space shower curtain.

[0009]

Next, the present invention will be described with reference to embodiments. Table 1 shows the composition and physical properties of Examples and Comparative Examples of the present invention. FIG. 1 is a sectional view showing an embodiment of the present invention. A cement slurry was prepared according to the composition shown in Table 1, and the cement slurry was put into the vat 1 shown in FIG. 1, made up with the wire cylinder 3, transferred onto the endless felt 4, and suctioned the moisture contained in the seed film on the felt. The liquid is sucked in the boxes 6 and 6 ', and the spray liquid 8 is sprayed from the spray nozzle 7 located just before the seed film after water suction is transferred to the making roll.
Was sprayed on the surface of the seed film, and after making rolls were wound, a spraying liquid 8 ′ was further sprayed on the back surface of the seed film from a spray nozzle 7 ′. Next, the layers were sequentially laminated, and the film wound up on a making roll was taken out, formed into a plate, cured naturally for 14 days, cured, and measured for absolute dry gravity and bending strength in terms of dimensional change rate (%) according to the JIS method. As a result, the results shown in the lower column of Table 1 were obtained.

[0010]

According to the present invention, as described above, when a nonionic surfactant is present in water in pores of a substrate,
Since the surface tension is suppressed and the escape of moisture is facilitated and the shrinkage of the base material is reduced, it is possible to solve problems such as cracks in the nailed portion and peeling of the sealing.

[0011]

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cement slurry 2 Wire cylinder 4 Seed membrane 5, 5 'Suction box 6, 6' Spray nozzle 8 Making roll

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code Agency reference number FI Technical display location C04B 14/38 E04C 2/06 E04C 2/06 B28B 11/00 Z // (C04B 28/04 14 : 06 14:38 18:00)

Claims (1)

(57) [Claims] Claims: 1. A papermaking cylinder is used to make a slurry from a slurry for producing an inorganic plate mainly composed of cement and silica sand.
When a predetermined number of papermaking thin films transferred onto a belt are dewatered and wound up by a making roll, a nonionic surfactant of 0.5 to 12% by weight of the raw material of the thin film is added to the thin film before and after winding on the making roll. Manufacturing method for ceramic building materials.