JP2788159B2 - Manufacturing method of ceramic products - 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 producing ceramic products, and more particularly to a method for producing ceramic products from a cement mixture having a relatively low solid content, such as a papermaking method, a so-called flow-on molding method, or a casting method. It relates to a manufacturing method.

[0002]

2. Description of the Related Art Conventionally, ceramic products such as building materials formed from a cement composition containing cement as a main component have been used very widely. As a method for producing these ceramic products, a method for producing a plate-like product is mainly a method of producing a cement mixture having a low solid content concentration, and laminating the obtained seed films to a predetermined thickness to form a plate-like body. There is known a so-called flow-on molding method in which a cement mixture is supplied in a layer form onto a felt belt and dewatered to make a plate, or a casting method in which a cement water mixture is poured into a mold and cured and cured.

[0003]

[Problems of the prior art] In these plate-like products, fast-strength additives such as CaCl ₂ , water glass, Na ₂ CO ₃ , NaOH, and calcined ash are used as cementitious fast-strength additives to improve product strength. In some cases, granite or the like is added, but in the case of the above-mentioned production method using a cement mixture having a low solid content, there is a problem that an effect commensurate with the addition cannot be obtained.

That is, most of the above-mentioned fast-strength additives are generally water-soluble or originally liquid. On the other hand, in the papermaking method, a large amount of water is used, and the early-strength additive is dissolved in this water, so most of the early-strength additive added is discharged to the outside together with excess water, and In the case of the so-called flow-on molding method, a large amount is discharged to the outside together with the squeezed water during suction dehydration during molding, and is also discharged to the outside together with the water generated by the press during the pressing process used in the papermaking method, flow-on and casting method. However, there is a disadvantage that a large amount of the additive is used and a large amount of the early-strength additive is wasted. In addition, a separate purification treatment device for the early-strength additive contained in these effluents is required, and there is a drawback in that ancillary facilities for these are also large.

[0005]

SUMMARY OF THE INVENTION In view of the above problems, the present invention provides a method for molding a product from a cement mixture that uses a large amount of water, such as a papermaking method, a flow-on molding method, and a casting method.
The purpose of the present invention is to make it possible to use an efficient early-strength additive.

[0006]

That is, the method for manufacturing a ceramic product according to the present invention comprises impregnating and impregnating a water-absorbing polymer with a liquid early-strength additive, and cementing the water-absorbing polymer with a reinforcing fiber,
A cementitious mixture is prepared by mixing and stirring with the necessary aggregate and water, and an excess strength water is removed from the mixture to form a product shape, and then the product is impregnated with the water-absorbing polymer. Is pressurized at a pressure at which leaching occurs, and then cures and hardens.

[0007]

The type and amount of the cement composition used in the present invention, ie, cement, silica, reinforcing fibers, and other necessary aggregates and water, have been conventionally used in the papermaking method, flow-on molding method or casting method. Is the same as
There is no particular point about these.

In the present invention, the early-strength additive added for improving the strength of the product is added in a state of being impregnated and impregnated in the water-absorbing polymer. This water-absorbing polymer, once impregnated with the early-strength additive, does not release unless some external force acts from the outside, so even if it is added to a cement water mixture having a low solid content, these are easily eluted in water. No Therefore, in the case of the papermaking method, the water-absorbing polymer is made up together with the cement solid content and mixed in the seed film.

When the seed film is laminated and then compressed by a press, the early-strength additive impregnated therein is leached and diffuses into the cement matrix to exhibit the early-strength effect. Also, in the case of flow-on, the elution of the early-strength additive during suction dehydration is prevented, and the additive is diffused into the cement matrix during the subsequent pressing step. In the case of the casting method, during the pressing step, the early-strength additive is prevented from diffusing into the matrix and flowing out due to the pressing pressure.
As a result, the strength is improved by adding the early strength additive.

[0010]

Next, an embodiment of the present invention will be described. Based on the compounding materials shown in Table 1, the papermaking method using the largest amount of water in relation to the mixing of cement water has a thickness of 5 m.
m, a plate having a width of 45 cm and a length of 90 cm were formed. The molded plate was pressed at a surface pressure of 50 kg / cm ² . As an early-strength additive, manufactured by Mitsubishi Yuka Co., Ltd.
R ", which was impregnated with a water-absorbing polymer.

Next, the formed plate-like body is naturally cured at room temperature for 12 hours, and its bending strength is measured. Thereafter, the steam pressure is 8 kg / c.
Autoclave curing was performed under the conditions of m ² , and the bending strength and specific gravity of the plate were measured. The results were as shown in the lower column of Table 1. In Comparative Examples 1 and 2 of Table 1 shows <br/> the case of adding no early strength additive is impregnated in the water-absorbing polymer.

[0012]

[Table 1] In the table, the numbers in the composition table indicate% by weight. * 1 “Primary bending strength” indicates the bending strength after primary curing, and the unit is kg / cm ² . * 2 "secondary flexural strength" unit showed a flexural strength after autoclave curing is kg / cm ^2.

As is clear from Table 1, according to the method of the present invention, it was confirmed that the bending strength after the primary curing was remarkably increased, and that the plate material strength after the autoclave curing was sufficiently improved. Was.

[0014]

As described above, according to the method of the present invention, the addition amount of the early-strength additive to the cement matrix, which had conventionally been poor in yield, is sufficiently ensured, and in particular, the strength of the board after the primary curing can be obtained. It is done.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI C04B 16:02 24:24 24:00)

Claims (1)

(57) [Claims] 1. A cement mixture is prepared by impregnating and impregnating a water-absorbing polymer with a liquid early-strength additive, mixing said water-absorbing polymer with cement, reinforcing fiber, necessary aggregate and water,
After removing excess water from the mixture to form a product shape, the product is pressed at a pressure at which the early-strength additive impregnated with the water-absorbing polymer is leached, and then cured and cured. Manufacturing method of ceramic products.