JPS61163176A - Manufacture of inorganic product - 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 Field of the Invention This invention relates to a method for producing inorganic products, and more particularly to an improvement in the method for producing lightweight foamed inorganic products by a cement slurry casting method. - Conventional technology As a means of manufacturing cement products, the so-called casting method, in which cement slurry is injected into a mold and cured, is widely known.

Production means of this type are used in particular for the production of lightweight foamed concrete products.

However, with the above manufacturing method, after the cement slurry is injected into the mold, the mold cannot be removed for at least half a day until the cement slurry inside hardens, and therefore, the mold rotation rate is poor and it is extremely difficult for mass production. There was a problem that many molds were required.

In order to solve the above problems, the inventors of the present application have conducted various studies and found that foamed aggregates that can be added to lightweight foamed concrete products and air-entraining agents that can be added to foam cement slurry. It has been found that the so-called backing 7 laxation effect is greatly enhanced by the interaction of

Problems to be Solved by the Invention The present invention has been made based on the above-mentioned knowledge with the aim of significantly shortening the demolding time of uncured products in the casting method, thereby simplifying the manufacturing process.

The technology that led to solving the problem The method for manufacturing an inorganic product of the present invention consists of cement and acrylic air, which is made by adding asphalt to an acrylic ultrafine particle emulsion of 0.1 to 1% to the cement. A cement slurry obtained by adding and mixing water at a water/cement ratio of 0.5 to 0.7 to an entraining agent was injected into the mold, and expanded shale was heat-treated in this cement slurry. Mix the required amount of pellet-shaped inorganic foamed aggregate with different particle sizes, insert a rod-shaped vibrator into the slurry to give sufficient uniform vibration to the entire surface, and immediately remove it from the mold and cure it. It is characterized by this.

Action Acrylic air entraining agent (hereinafter referred to as “
What is ``acrylic AE agent''?

The particles forming the emulsion are polymer particles in the form of spherical particles with a size of 0.1 to 1.0 μm, of which 95.0 to 99.0% by weight is polymerizable and hydrophobic. The remaining 5.0 to 0.1% by weight
consists of a polymerizable hydrophilic component, and the hydrophobic component is acrylic acid and and/or one or more of esters of methacrylic acid, styrene, butadiene or vinylidene chloride, and the hydrophilic component comprises an ethylenically unsaturated polymerizable compound having at least one carboxyl, hydroxyl, amide, nitrile or sulfonate. , and the hydrophilic component, in monomeric form, is at least 5% soluble in an aqueous alkaline solution.

When the above-mentioned acrylic AE agent is added to cement slurry, the action of its hydrophilic and hydrophobic groups causes the formation of a very large number of microscopic bubbles, which have never been seen before. It has properties such as extremely good adhesion to material surfaces.

In addition, pellet-shaped inorganic foamed aggregate obtained by high-temperature firing of expanded shale is obtained by crushing expanded shale, humidifying it, and granulating it.
It is baked at a high temperature of about 1100℃ in a rotary kiln, and then gas is generated in the particles during this baking process, causing them to grow and expand into countless closed cells, and has a light specific gravity of 0.5. It also has characteristics such as high strength and high chemical resistance.

As for the size of the particles, particles of various sizes are used, ranging from approximately 211 mm to 10 mm in diameter.

As the cement, a commonly used cement is used, and although not particularly limited, water/cement ratio is set at 0.5 to 0.7 in order to optimize fluidity when made into a cement slurry.

If the water/cement ratio is less than 0.5, the fluidity of the cement slurry will be low, and if it is greater than 0.7, the fluidity will be too high, and both are not suitable for achieving the purpose of the present invention.

When the above cement and water are mixed in the required amount and mixed with water to form a slurry, a large number of microbubbles are first formed in the slurry by the acrylic AE agent, resulting in a foamed cement slurry. At the same time, the so-called bearing effect due to microbubbles is exerted, and the fluidity of the slurry is also greatly improved.

Next, when this slurry is poured into a mold and the required vibration is applied, the lightweight aggregates in the slurry move to minimize the gaps between them, and small-diameter bones are inserted into the gaps between the large-diameter aggregate particles. The material particles enter the structure, and the lightweight foamed aggregate forms a three-dimensional structure similar to a stone wall.

In other words, the packing effect is exerted, and a molded body with the aggregate as the core is completed within the mold.

Therefore, once the structure has such a shape, the molded product exhibits self-shape retention, and even if the mold is removed, the molded product retains its shape.

This is then cured and hardened to form a product.

Example Next, an example of the method of this invention will be described.

(Example 1) Cement
10% by weight lightweight foamed aggregate (product name “Cerapol” manufactured by Sumitomo Mining Co., Ltd.) 90
The above-mentioned raw materials were prepared, and a foamed cement slurry was first obtained using cement and an AH agent.

Next, this was made into a structure with a depth of 1011 m, a width of 50 cm, and a length of 1
Fill the 00α mold completely, then add lightweight aggregate, use a vibrator with a protruding rod-shaped vibrator, insert the vibrator into the cement aggregate slurry, and gradually increase the insertion depth. The vibration was applied while making it shallow.

When the rolling motion of the lightweight foamed aggregate could no longer be observed without struggling against the vibration, the vibrator was removed, and the surrounding formwork was removed, and a hardening reaction had occurred in the cement slurry. Despite this, the shape was maintained due to the backing fraction effect of the aggregate, and when a bending test was performed after curing for 16 hours in a humid curing room at \20℃, the result was 38,4.
A high strength of ka/cIft was obtained. Note that the specific gravity is 1.6, which is 30 to 40% larger than that of normal casting, because the vibration causes close packing.

Effects As mentioned above, although this invention is cast molding,
During the unhardened stage of the cement slurry, the backing fraction effect of the aggregate retains the shape of the molded product, so the time to remove the formwork is greatly accelerated.
Therefore, handling of the formwork can be greatly simplified. Furthermore, the movement of the aggregate is smooth due to the action of microbubbles caused by the acrylic air-entraining agent generated in the cement slurry, and it can be processed in a short time until the aggregates settle into the final combined positional relationship.

Furthermore, the lightweight foamed aggregate itself has many minute recesses on its surface, and the acrylic AE agent penetrates well into these recesses, resulting in good adhesion between the cement matrix and the aggregate, making it lightweight. Moreover, it has the effect of making it possible to manufacture a high-strength foamed inorganic concrete plate.

Procedural amendment (voluntary) August 9, 1985 Manabu Shiga, Commissioner of the Patent Office 1゜Indication of the case 1985 Patent Application No. 002532 2 Name of the invention Process for manufacturing inorganic products 3, Person making the amendment Case and Relationships Patent Applicant Address 1-2-47 Shikitsu Higashi, Naniwa-ku, Osaka Name (105) Kubota Iron Works Co., Ltd. Representative Director and President Shigeaki Tamano 4゜ Agent Address 662 Address Mondo, Nishinomiya City, Hyogo Prefecture Zhuang No. 15, No. 11, No. 6, Contents of amendment (1) "(Example)...A foamed cement slurry was obtained" stated in page 7, lines 7 to 13 of the specification was changed to the following: will be corrected.

(Example) Cement 20% by weight lightweight foamed aggregate *1 90 I acrylic AE agent *2
0.5% by weight of water based on cement 10% by weight based on all of the above raw materials *1 Product name: "Ceraball" manufactured by Sumitomo Mining Co., Ltd. *2 Product name: rcEMO5110J manufactured by Boho's Nobel Chemi Co., Ltd. Prepare the above raw materials, and first add cement and AE A foamed cement slurry was obtained.

Claims (1)

[Claims] (1) Water/cement=0.
A cement slurry obtained by adding and mixing 5 to 0.7 of water is injected into the mold, and into this cement slurry, expanded shale is subjected to high heat treatment to form pellet-like inorganic foams of different sizes. Manufacture of inorganic products characterized by mixing necessary amounts of each with aggregate, inserting a rod-shaped vibrator into the slurry to apply sufficient vibration uniformly to the entire surface, immediately removing the mold, and curing the product. Method.