JPS5941214A - Manufacture of hollow body - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Technical field The present invention belongs to the field of technology for manufacturing building materials made by hardening inorganic aggregate using a thermosetting resin as a binder.

(B) Background Art Building materials used for exterior walls, buildings, factories, etc. are required to have high strength, light weight, and low water absorption in order to withstand harsh natural conditions.

Since such conditions or performance cannot be met, a method of hardening fly ash, volcanic lapilli, etc. using a thermosetting resin has often been adopted.

It is desirable to provide such a compound with a hollow part from the viewpoint of cost and weight reduction, but a molding method has not yet been established and implementation has yet to be seen.

(c) Purpose of the invention This invention was made for the purpose of providing a method for easily obtaining a lightweight body by improving an inorganic building material having a hollow portion based on the so-called casting method. .

(d) Disclosure of the Invention The present invention involves embedding a metal pipe together with a matrix formed by hardening an inorganic aggregate such as fly ash or volcanic lapilli using a thermosetting resin as a binder, by a casting method. It is characterized in that it is molded by heating and hardened, then cooled and then extracted. The following description will be given with reference to drawings shown as examples.

FIG. 1 is a diagram showing the process of cast molding, in which (a) is a longitudinal sectional view and (b) is a front view. In this figure, 1 is a mold for casting, 2 is a metal pipe for weight reduction, and 3 is a vertically movable pipe holder. As shown in FIG. 1, the material is poured into a mold in which a metal pipe is arranged to protrude to the outside of the mold 1, and the material is hardened by a process to harden the binder. In this case, after curing, the pipe is extracted to obtain a hollow body. However, it is not always easy to remove the metal pipe. Therefore, a mold release agent is applied to the metal pipe and then cast, but even if this is done, when it is heated during curing, a sufficient mold release effect is maintained because the mold release agent vaporizes due to the heating. I can't.

In addition, in the above-mentioned casting method, it is necessary to compress to a certain degree and heat harden it, but the heating during compression is relatively limited to the front and back surfaces, making it difficult to obtain a lightweight body that is uniformly hardened. Met.

In this invention, we have further improved the above-mentioned points and invented a new molding method that overcomes the above-mentioned drawbacks, as will be explained below by way of example.

That is, (1) Insert the metal pipe 2 coated with a mold release agent into the vertically movable pipe receiver 2 of the metal casting mold 1 shown in FIG. Here, the metal pipe is not limited, and for example, iron, aluminum, etc. are used. Further, the metal pipe penetrates the side wall of the mold 1 and projects outside (separately). The size of the pipe is not equally limited, but is appropriately determined in relation to the wall thickness of the molded product.

(2) A composition containing a thermosetting resin is poured into the casting mold 1. There are no similar restrictions on the binder used here, but in principle any so-called thermosetting resin can be used. For example, phenolic resin, melamine (
Resin, polyester resin, etc. are used. There are no similar restrictions on the bone phase that is mixed with the thermosetting resin, but
For example, lightweight inorganic aggregates such as fly ash and shirasu balloons, and inorganic aggregates such as volcanic lapilli are used. Among these, so-called lightweight aggregates are preferred. The blending ratio of both is not particularly limited. Further, additives necessary for curing the thermosetting resin and other additives for the thermosetting resin can be mixed freely.

■ As shown in Figure 2, 150 to 20 mm from the top and bottom of the material.
The molding is performed by heating the material to about 0°C and then pressing the material from the top. At this time, the pipe 2 is kept at the center of the material by the vertically movable pipe support 3.

■ At the same time, a heating medium is passed through the pipe to heat it, and the material is heated and hardened from the center. However, this is not limited.

■ After continuing this heating and pressing for about 10 minutes, water or the like is passed through the pipe to cause rapid cooling and contraction of the pipe.

The structure of this invention has been described above, and the characteristics of this manufacturing method are as follows.

(1) When the pipe is heated more than the inside of the pipe, the density of the resin around the pipe increases due to expansion due to the heating, resulting in a stronger product.

(2) Since heating is performed from both sides of the pipe and material,
Heat flows evenly into the material! 4 Even when the thickness is large, a relatively uniform cured product can be obtained (η).

(3) Due to the sudden and intense cooling of the pipe, it contracts and becomes easier to release from the mold.

(e) Example The following formulation was adopted as the composition of the seedlings.

Calcium carbonate 10.0% pumice
40.0% Flyannonyu 40.0% Novolac type phenolic resin 10.0% Coefficient of linear expansion of cured product of the above compound: 3 to 4 x lO/°C 5 Coefficient of linear expansion of metal pipe Iron: lXl0/'C Aluminum: 2X10/'C Heat pressing temperature 200℃ Press pressure 20kg/c Pressing time 10 minutes Molding thickness 10-m For the above compound, there are two types of pipes (outer diameter 5fi, inner diameter 3mm) made of aluminum and iron. The performance was evaluated as shown in Table 1. did. The results shown in Table 2 were obtained.

Table 1 Table 2 (v) Effect This invention provides a method for embedding metal pipes when molding linox, which is made by hardening inorganic aggregate using a thermosetting resin as a binder, by a casting method. The method is characterized in that the pipe is poured into a mold, and after curing, a cooling medium is poured into the vibrator to cool the pipe, and then the pipe is pulled out.As a result, a lightweight paulownia wood with excellent performance can be obtained.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view and a front view of a casting mold as an example used in the present invention, and FIG. 2 is a cross-sectional view of a blank mold for explaining a manufacturing example. ■ Casting mold 2 is metal Pipe 3 is vertically movable pipe receiver 4 is the material poured into the mold Patent applicant Matsushita Electric Works Co., Ltd.

Claims (1)

[Claims] (1) When molding a matrix made by solidifying inorganic aggregate using a thermosetting resin as a binder using a casting method, metal pipes are embedded and molded together, heated and hardened, and then the pipes are molded. A method for manufacturing a hollow body characterized by cooling the pipe by flowing a cooling medium inside it, and then removing the pipe.