JPS58172258A - Foamed body manufacturing composition - 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 a composition for producing a foam, and is particularly characterized in that it provides a cement foam with excellent mechanical strength that can be stably foamed and hardened at room temperature.

Previously, the present inventors have used soluble alkali silicate as main components, hardening components such as cement and zinc oxide, and a specific foaming stabilizer, and foamed and hardened this through a metal foaming agent. At least we have obtained an inorganic foam.

This foam material technology has not only made it possible to use Baba foam material in various applications such as construction and furnace construction, where it was previously difficult to use it, but also made it possible to use it in various industries due to the uniqueness of its components and structure. It is also applied to various purposes. However, since it uses soluble alkali silicate as an essential component, it is subject to various limitations in use, and problems remain, for example, in determining the timing of foam curing under low salinity.

In view of these circumstances, the present inventors have continued to investigate, among the constituent components of the above-mentioned foam, especially the functions imparted by each compounded component during the production of the foam. In particular, as a result of continuing research focusing on the components of soluble alkali silicate, we have divided it into alkali oxide and Takasago acidic powder and found that it is actually possible to produce foam.
As a result, it was unexpectedly found that a good foam could be obtained only when 1lII# and S were combined in a specific blending ratio, and the present invention was thus completed. kOchi, the present invention is +a
) Calcareous silicate cement or mixed cement of calcareous silicate cement and calcareous aluminate cement (hereinafter referred to as (a) component), (b) alkali gold hydroxide (hereinafter referred to as (b) component), (c) Takasago acid solid powder (hereinafter referred to as (C) component), and (d) metallic foaming agent (hereinafter referred to as (d) component)
is the main component, water is added to it to make a paste, and the foam is made into 111i! It is something to be used for. Each component will be explained in detail below.

As mentioned above, the component (a) always contains silicate calcareous cement, and the cements used in this are ordinary Portland cement, early strength Portland cement, moderate heat Portland cement, silica cement, high sulfate slag cement, and fly ash. Cement, monotonous or bib hydraulic cement such as lime slag cement. Calcareous aluminate cement, ie, alumina cement, can be blended with this calcareous silicate cement.

However, when alumina cement is used alone or in too much alumina cement, the curing reaction takes place and the desired foam cannot be obtained, so the mixing ratio is silicate calcareous cement/C.
) 300 parts by weight per 0 parts by weight. Next (b) -@-4'<g°Li OH.

It refers to a hydroxide of an alkali metal such as NaOH or KOH, and when producing a foam, it may be in the form of powder, liquid, or water-soluble. , component (C) contains at least 70% 5102 in its constituent components.
Highly silicic acid powder containing silica, natural minerals such as silica clay, silica stone, crushed sand, and ridge grass, silica dust by-produced during the production of wire alloys by electric heating or legal methods, and chemical products. Examples include silica gel and white carbon. These are used in powder form furnaces. Component (d) includes those that generate bubbles in the alkaline water bath, such as simple metals, alloys, and intermetallic compounds.

The present invention uses the above components (a) to (d) as essential components,
By blending water with this, it is possible to produce a foam of the Ikki Button, and the blending ratio is 100 MWt of component (a).
For the part, (b) component 2~/jO heavy area culm, (C)
Ingredient j−, 2! ; 0 polydispersed parts and weight d)' component 0. /
~10 parts by weight, especially component (b) and (e
) component is expressed by the formula S+02/R20 (where R is an alkali metal), and it is important that the molar ratio is within the range of 1.0 to 5.0, and it is important that the molar ratio is within the range of 1.0 to 5.0. 1k 6 obtained the desired foam. The total amount of component (b) and component (c) is 10,000 of component (a).
7~e03 against heavy needles! The size is about iOtM, M part. When blending the above components (a) to (d) to obtain a foam, a mixed powder consisting of components (a), (e), and (d) is prepared in advance, and this mixed powder and (
The easiest method is to mix and stir aqueous solutions of the components b) to form a paste. Of course, it is also possible to mix the acid liquid system of components (b) + (c) into the powder system of components (a) and (d), and by such mixing means, the reaction properties of the composition of the present invention and the foamed material can be changed. It does not particularly impede performance. −
The composition prepared in the form of a sputum paste gradually starts to foam and undergoes a curing reaction to form a foam.

A hard foam is completed within 2 q hours at the latest from the start of foaming, and this foam has excellent heat insulation properties. What is noteworthy is that the foaming and curing reaction of such a composition proceeds relatively smoothly even at extremely low temperatures, and its properties are different from those of compositions for producing foams up to the level of bonito flakes. be. The composition of the present invention consists of the above components (a) to (d), but for the purpose of improving mechanical strength, heat insulation, etc., a so-called foaming stabilizer can be added, and it is effective as such a foaming stabilizer. These include porous inorganic powders such as zeolite, carbon black, and activated carbon, mineral powders with a layered MIt structure such as mica, talc, sepiolite, and palygorskite, and surfactants that can be used in extremely small amounts. can be exemplified. on the other hand,
In addition to the above-mentioned essential components, the composition of the present invention may also contain inorganic fibers, lightweight aggregates, water-soluble polymers, aqueous dispersions of synthetic polymers, zinc oxide, phosphates, etc. as fillers or strength-improving materials. It can be used as long as it does not interfere with the foam curing reaction. The present invention will be explained in detail below with reference to Examples.

Example 1 100g of ordinary Portland cement, 0g of silica clay, and 1g of metal slag, //! Collect into a polyethylene container and mix well. On the other hand, potassium hydroxide tOg is water/jOc
To the water obtained by popular understanding during c? Potassium chloride-ea**e*a
Add the aqueous solution of cloud, Φ-, liao, kenic acid, -3 Biyi ginseng to the above mixed powder, and stir and mix well. This is quickly placed in a constant temperature incubator at 5°C and observed from outside the fist. The mixture started foaming after 20 minutes, and curing was completed after 3 hours to obtain a foam. The bulk specific gravity of this foam is 0.25, and the compressive strength is 7 kg/cm.
Met.

Examples 2 to f In Example 2, a foam was obtained in the same manner as in Example 1, except that each component was formulated as shown in Table 1 and water was added as appropriate. These foams were subjected to the same tests as in Example 1 and the results shown in Table 1 were obtained.

Comparative Examples/~3 In Example 1, a foam was obtained in the same manner as in Example 1, except that each component was formulated as shown in Table 1 and water was added as appropriate.

These foams were subjected to the same tests as in Example 1 and the results shown in Table 1 were obtained.

Claims (1)

[Claims] 1. A composition for producing a foam comprising (a) a calcareous silicate cement or a mixed cement of a calcareous silicate cement and a calcareous aluminate cement, (b) an alkali metal hydroxide, and water. 2. The calcareous silicate cement and the calcareous aluminate cement are used for foams according to claim 1, wherein the calcareous aluminate cement has a weight of 0 to 300 parts by weight per 100 parts by weight of the calcareous silicate cement. Composition. 3. (a) Calcareous silicate cement or mixed cement of calcareous silicate cement and calcareous aluminate cement 10
For 0 MMk part, (b) 2~/jO weight flt part of alkali hydroxide, (C) 3-230WN part of high silicic acid powder, and (d) 0. The composition for producing a foam according to claim 1, comprising a blending ratio of / to 10 parts by weight. 4. Claim 1, in which silicic acid in the high silicic acid powder is blended in an amount of 0 to S.0 mol per 1 mol of the alkali metal oxide in the alkali metal hydroxide. Or the composition for producing a foam according to item 3. 5. The composition for producing a foam according to claim 1, further comprising a foam stabilizer.