Compositions for preparing inorganic foamed bodies

Details Compositions for preparing inorganic foamed bodies Compositions for preparing inorganic foamed bodies

1982-06-21

1984-11-20

Poer, James

Compositions: coating or plastic

Coating or plastic compositions

Metal-depositing composition or substrate-sensitizing...

C04B 1904

Patent

active

044837135

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

This invention relates to compositions for preparing inorganic foamed bodies, and more particularly to compositions which afford foamed bodies merely when kneaded with water at ambient temperature.
Conventionally inorganic foamed bodies are prepared by the following processes: cement to obtain a foamed mortar. foam the glass. glass. the composition of process (c). casein or starch, is used conjointly with the composition of process (c) or (d).
The following difficulties are encountered in preparing foamed bodies by these conventional processes. the starting composition . . . (b) to (e) applied in a foamed state . . . (a), (c) to (e) hardening . . . (a), (c) to (e) therefore liable to develop cracks . . . (a) to (e) . (a) to (e)
The foamed bodies obtained by the conventional processes also have the following drawbacks. especially low bending strength . . . (a) to (e). composition is applied . . . (a) to (e).
We conducted research to overcome the foregoing difficulties and drawbacks of conventional inorganic foamed bodies, succeeded in developing a novel composition for preparing foamed bodies which is almost free of these drawbacks and accomplished an invention (Published Unexamined Japanese Patent Application No. 85450/1980).
The invention is characterized by mixing together the following ingredients in the presence of water to obtain a paste;
The composition gives at ambient temperature and atmospheric pressure foamed bodies which are outstanding in various properties. However, our subsequent research has revealed that the foamed body still remains to be improved in its adhesion after immersion in water and also in its compression strength after it has been subjected to repeated cycles of high temperatures and low temperatures.
The present invention has been accomplished to overcome the above drawbacks .


BRIEF DESCRIPTION OF THE DRAWING

FIG. 1 illustrates an apparatus used to test the present composition for the ability to prevent condensation.


DISCLOSURE OF THE INVENTION

The present invention provides a composition for preparing foamed bodies which comprises as its active components:
According to the present invention, the above ingredients give an inorganic foamed body merely when mixed together at ambient temperature, provided that a water-soluble alkali metal silicate is used as A component. If A component used is a usual alkal metal silicate, such as anhydrous water glass cullet, which is insoluble or sparingly soluble in water, it is impossible to fulfill the above object. Examples of useful alkali constituents of A components are alkali metals, such as lithium, sodium, potassium and rubidium, and quaternary ammonium. Sodium and pottasium are especially preferable since they are readily available inexpensively and yet highly effective in promoting foaming and hardening. Further insofar as A component is soluble in water, the composition thereof or the mole ratio of the alkali oxide to SiO.sub.2 is not limited. However, it is preferable that the mole ratio be 1.5 to 4.0, more preferably about 1.8 to about 3.0. When the mole ratio is 1.8 to 3.0, the composition gives foamed bodies having outstanding water resistance and high mechanical strength. Since A components are usable singly, or at least two of them can be used conjointly, in the form of a powder or an aqueous solution. For the ease of preparation of pastes, an aqueous solution is preferable which has a solids concentration of at least 10 wt.%, usually about 10 to 60 wt.%. In this case, merely when the aqueous solution is admixed with the other components, a pasty composition can be prepared with ease which undergoes only reduced shrinkage during hardening.
Various metal elements, metal alloys and intermetallic compounds are usable as metallic blowing agents, i.e. as B components, according to the invention. Examples of useful metal elements are those in Groups IIB, IIIA, IIIB, IVA, IVB, VA, VB, VIB, VIIB and VIII of the Periodic Table, among which those belonging to the third to fifth periods are preferable. More specifi

REFERENCES:
patent: 4084980 (1978-04-01), Motoki
patent: 4171985 (1979-10-01), Motoki et al.

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