JPS6033271A - Super lightweight alc material and manufacture - 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 The present invention relates to an ultra-lightweight ALC material (autoclave-cured lightweight cellular concrete material) and a method for producing the same. The purpose is to propose an ALC material that has a lower density than conventional ALC materials and has high strength despite its low density, and a method for manufacturing the same.

Conventionally, ALC boards are made by pouring raw material mortar made by mixing powder raw materials such as calcareous raw materials and silicic raw materials, water, and a foaming agent such as fine aluminum powder into a mold, foam-molding it, and then curing it in an autoclave. ALC material was obtained by doing so. The standard ALC material obtained by this manufacturing method is generally a bone dry specific gravity of about 0.5, and materials with a lower specific gravity than this can only be obtained by ultrafinely pulverizing the powder raw material, and the strength is extremely high. This resulted in poor practicality.

This invention was made by focusing on the above problems.
The gist is an ALC material characterized by having multiple pores formed by a gas blowing agent and pores formed by melting thermoplastic resin foam particles. Another invention is to add and mix thermoplastic resin foam particles to a raw material mortar containing a blowing agent that generates gas, to foam-form with the blowing agent in a mold, and to cure in an autoclave. This is a manufacturing method for ultra-lightweight ALC material.

The ALC material of this invention has pores created by the same gas blowing agent as the conventional AL (44), and also pores formed by melting the thermoplastic resin foam. This ALC material adheres and reinforces the pores, so even though the apparent specific gravity of this ALC material is lower than that of conventional ALC materials, the decrease in strength is small.Also, due to the manufacturing method of this ALC material, For example, compared to conventional ALC materials that consist only of pores created by gas blowing agents, there is no need to make the raw materials ultra-fine, and it is possible to easily obtain ultra-light ALC materials with a specific gravity of 0.4 or less using conventional equipment and processes. .

This invention will be explained in detail below.

70 parts by weight of water and a gas blowing agent (
A raw material mortar was prepared by adding 0.07 MR part of aluminum powder. Polystyrene foam hollow particles with a smooth surface (arithmetic mean diameter 1.5 ttr) were added to this raw material mortar.
m, bulk density 29.5 g/l') as raw material mortar solid content IKP, apparent volume 1.21A! , 3.22A'
, 7.351 J, and 19.56 A to prepare four types of mixed mortars.

Each of these four types of mixed mortar is poured into a mold, foamed with gas from a gas foaming agent, and semi-hardened.
It was cured in an autoclave (10 atm, steam at about 180°C). The foam hollow particles in the mixed mortar melted and reduced volume during the autoclave curing process, after which pores with an arithmetic mean pore size of approximately 1.5M were formed. This AL
Material C had pores caused by gas and pores caused by melting of expanded particles, and had a specific gravity shown in the table below.

(Table) Figure 1 shows the correlation graph of the bending strength and compressive strength with respect to the specific gravity of this ALC material sample trial.
The bending strength and compressive strength of material C are listed. Also, Figure 2 shows
The appearance is a graph of the correlation between thermal conductivity and specific gravity. The numerical values in the above graph are the arithmetic average values of 5 samples, and the thermal conductivity was measured according to the JIS A1412 thermal conductivity measuring method (flat plate comparison method).

The foamed thermoplastic resin beads used in this invention are preferably polystyrene-based, polyolefin-based, or the like foamed beads. It must melt at the autoclave curing temperature and must not generate corrosive or stolen gases. Its bulk density is usually selected from a range of about 10 to 100 g71.

[Brief explanation of drawings]

Figure 1 shows the bending strength versus specific gravity of the ALC material sample sample.
Figure 2 is a graph showing the correlation between compressive strength and thermal conductivity with respect to the specific gravity of the ALC material sample. Procedural amendment September 29, 1988 Patent Application No. 142810 2, Title of invention Ultra-light ALO material and its manufacturing method 3, Relationship with the person making the amendment case Special fraud applicant address (003) Asahi Kasei Industries, Ltd. Name: 4, Agent: Nyato Akasaka, 6-5-21 Akasaka, Minato-ku, Tokyo 107 (7009) Satoshi Hisakado, Patent Attorney Amend "Figure 1" to the attached "Figure 1."

Claims (2)

[Claims] (1) An ultra-lightweight ALC material characterized by having multiple pores formed by a gas blowing agent and pores formed by melting thermoplastic resin foam particles. (2) An ultra-light product characterized by adding and mixing thermoplastic resin foam particles to a raw material mortar containing a gas-generating foaming agent, foam-molding with the foaming agent in a mold, and curing in an autoclave. Manufacturing method of ALC material.