JPS6143317B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lightweight body composition with excellent performance, and more particularly, to a composition in which the foam curing speed of the lightweight body is adjusted to suit the purpose of obtaining a desired lightweight body. It is about things. The present inventors have been engaged in research for some time to obtain a lightweight body by taking advantage of the properties of alkali silicates such as their binding strength and nonflammability, and have already achieved water resistance, compressive strength,
We have created lightweight, foam-hardened bodies with excellent impact resistance. However, since the time for foaming and hardening is generally short, it takes time to transport the mixed paste, and the foaming and hardening occurs extremely quickly, especially in places with high temperatures, causing problems in work. The inventors of the present invention have taken various measures to adjust the foaming or curing process in order to obtain such a foam-hardening lightweight body. The resulting composition has now been completed. That is, the present invention provides an aqueous solution of a silicate represented by the general formula R ₂ O.nSiO ₂ (where R is an alkali metal or quaternary ammonium, and n is a positive number from 1.5 to 7.0), and an aqueous solution of the silicate. A lightweight material consisting of a curable component, a granular lightweight material, and a metal powder pretreated with a salt selected from hypochlorites, chlorates, and perchlorates, or an aqueous solution containing the salt and a silicate. The foam curing time of such compositions can be easily adjusted, and the compressive strength of lightweight bodies obtained by methods such as casting or painting can be improved to some extent. I found out what to do. Each component of the present invention will be explained in detail below. The aqueous solution of silicate used in the present invention is an alkali silicate having a molar ratio of SiO ₂ /R ₂ O in the range of 1.5 to 7.0 as described above, and is used in the form of an aqueous solution and is usually called water glass. There is. Next, the hardening components of the silicate aqueous solution can be those commonly used as hardening agents for water glass, such as fluorides, fluorosilicates, phosphates, borates, cement, zinc oxide,
Examples include calcium sulfite. Furthermore, granular lightweight materials can be used regardless of organic or inorganic materials, such as granular foams or granular crushed products of synthetic resins such as vinyl chloride, phenol, urea, styrene, urethane, and ethylene, and granular particles of synthetic rubber. Organic lightweight materials such as foams and crushed materials, inorganic foams such as vermiculite, expanded shale, perlite, silica balloons, and granular foamed silica, as well as other inorganic artificial lightweight aggregates and crushed materials of ALC, etc. can be listed. Furthermore, the metal of the pretreated metal powder may be a so-called amphoteric metal such as Al, Mg, Mn, Co, Ca, Sn, Mo, Sb alone or an alloy containing them, and metal silicon, silicomagnesium, etc. , silicon alloys such as ferrosilicon can also be used.
These metal powders are pretreated when preparing the composition of the lightweight body, and the pretreatment agents used include hypochlorites such as sodium hypochlorite and potassium hypochlorite, and chloric acid. It is an aqueous solution of a kind of salt selected from chlorates such as sodium and potassium chlorate, and perchlorates such as sodium perchlorate and potassium perchlorate, and if necessary, an aqueous alkali silicate solution or colloidal Silica can be added and blended. It is important to adjust the concentration when pre-treating such a pre-treatment agent; in the case of the chlorine-containing salts, it is about 0.01 to 12%, preferably about 0.01 to 8%, and in the case of alkali silicates, it is about 0.5 to 12%. 25% is desirable. To give a concrete example of such a pretreatment, a pretreatment agent liquid is prepared in advance, then the metal powder is gradually mixed with stirring, and then the mixture is heated at room temperature.
Treat for 0.5 to 30 minutes, or even shorter if heated, and then filter, wash with water, and dry. In addition, surfactants, inorganic pigments, various inorganic extender pigments, additives, and the like may be appropriately blended into the composition of the present invention depending on various subpurposes. The present invention consists of the composition as described above, and the blending ratio is about 1 to 100 parts by weight of the curable component of the silicate aqueous solution to 100 parts by weight of the solid content of the silicate aqueous solution.
50 parts by weight, about 5 to 100 parts by weight of granular lightweight material, and about 1 to 20 parts by weight of pretreated metal powder. The solid formed product of the composition of the present invention obtained in this way can be seen through a drying process by casting or coating, using the foaming hardening mechanism of the composition, but its working structure is Although it is unknown, it has very good water resistance and alkali resistance, and has good adhesion to various substrates, and when obtaining a lightweight body, foam hardening can be well controlled, so it does not solidify in the pipe during transportation. In addition, it has a suitable pot life even when exposed to high temperatures, so there is no problem in working with it, and unexpectedly it has been found that the compressive strength of lightweight bodies is slightly improved. Examples are shown below. Example An aqueous treatment solution was prepared in advance so that potassium chlorate was 3% by weight and sodium silicate (SiO ₂ /Na ₂ O molar ratio 3.9) was 17% by weight, and 100 g of this treatment solution was prepared.
20g of Al powder was added to the mixture, pretreated at 35°C for various times (Experiments 1 to 5), filtered, washed with water, and dried.
Pretreated Al powder was obtained. Next, 5 parts by weight of sodium fluorosilicate were added to 100 parts by weight of an aqueous alkali metal silicate solution (solid content 40% by weight) consisting of Na ₂ O.3.1SiO ₂ .
10 parts by weight of foamed vermiculite (10 to 24 mesh) with a specific gravity of 0.2 and 5 parts by weight of the above pretreated Al powder were mixed, and approximately 1
After stirring for a minute, pour it into a 300 x 300 x 15 mm mold.
When we measured the foaming start time in a room at about 20℃,
The results are as shown in Table 1. In addition, a compressive strength test was conducted using this molded plate, and the results were as shown in Table 1. 【table】

Claims (1)

[Claims] 1 An aqueous solution of a silicate represented by the general formula R ₂ O・nSiO ₂ (wherein R is an alkali metal or quaternary ammonium, and n is a positive number from 1.5 to 7.0), a curable component of the aqueous silicate solution, A lightweight body composition comprising a granular lightweight material and a metal powder pretreated with an aqueous solution of one kind of salt selected from hypochlorites, chlorates, and perchlorates or a mixture of the salt and a silicate.