JPS60204679A - Manufacture of inorganic 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 an inorganic material composed of water glass and kaolin, which has good workability, and which has water resistance and hot water resistance when solidified, and a method for solidifying the same.

One of the additives widely used industrially is water glass. Usually, water glass is a concentrated aqueous solution of an alkali silicate salt obtained by melting silicon dioxide and an alkali, and is a colorless, highly viscous liquid. When the water glass is left in the air, the water evaporates and solidifies. Therefore, water glass is used as an adhesive for artificial stones, ceramics, pole paper, etc. by using this property.

It is also widely used as paints, soil conditioners, molding materials, etc.

However, even if the water glass is placed vertically, when it comes into contact with water, it absorbs water again and returns to a viscous liquid. Therefore, it is impossible to use this water glass in products that are used in humid places such as outdoors, or in places where it comes into direct contact with water. That is, the solid water glass has the disadvantage of not being water resistant.

In the past, many attempts have been made to make the solid water glass water resistant, and one of these methods is to mix a heat-condensation type phosphoric acid curing agent to make the water glass insoluble, or to use cement laminated water glass to make it insoluble. It may be blended or solidified by adding zinc oxide or the like. However, although these compositions have a certain level of water resistance against water at room temperature, they have the disadvantage that they gradually dissolve when left outside for a long period of time or when immersed.

Therefore, in view of the above-mentioned conventional problems, the inventors of the present invention conducted various researches to solve the problems, and as a result, they came up with the present invention.

The purpose of the present invention is to provide a method for molding, coating, etc.

To provide a method for producing an inorganic composition which has good workability and does not dissolve even when immersed in warm water for a long time as well as water at room temperature when solidified.

That is, the invention of the present application is based on the water glass and the solid content of the water glass.
A mixing step of mixing 50 to 200 f of a kaolin group hydrous aluminum silicate substance in dry weight to 0 g to obtain an inorganic material;
This is a method for producing an inorganic composition, characterized by comprising a heating step of heating to a temperature of .degree. C. for solidification.

According to the present invention, the reaction between the water glass and the kaolin group hydrated aluminum silicate substance proceeds sufficiently in order to solidify it at a high temperature, so that the obtained solidified product is better than that solidified at room temperature. Improves water resistance and hot water resistance.

It is applied to metal or inorganic substrates as an adhesive.

When solidified, the solidified product exhibits a stronger adhesive force than one solidified at room temperature.

Hereinafter, one aspect of the present invention will be explained in more detail.

As the water glass in the present invention, an aqueous solution of an alkali silicate salt of 10 to 70% by weight (wt%) can usually be used. The alkali silicate salt is Na20-nsi02 (■λ=1-4
) is commonly expressed.

Na2O is xzO, Li2O or (NH4) 20
It may be. Alternatively, water glass No. 3 according to the JIS standard, which is commercially available as Hydraulic Lanu, may be used.

It has a composition of 11 usually = (] or an integer of 1 or more). Specifically, as n=00 substances, kaolinite and Dickite are used.
ite), ncrita, metahalloysite (M, etahalloysite), etc.

Halloysite is a substance having n=1 or more, that is, a substance having interlayer water.

It is preferable that the size of Q is within the range of Q1zw to 5fl. This is because by using powder of this size, a uniform inorganic material can be obtained.

The shape of the kaolin group hydrated aluminum silicate material is not constant; for example, kaolinite, dietskiite, and nacrite have a hexagonal plate shape.

Metahalloysite, halo-f site, is tubular-i/molten cylindrical or spherical.

The kaolin group hydrated aluminum silicate substance is.

Commonly known as kaolin, it is commonly known as Korean kaolin, New Zealand kaolin, and New Zealand kaolin, with the name of the region of production placed before the word ``kaolin.''

It is called Kongo kaolin, Ina kaolin, etc.

Next, a mixing step is performed in which the kaolin hydrated aluminum silicate substance and water glass are mixed.

Obtain inorganic material. The mixing step can be carried out using two conventional mixers or ball mills.

The mixing ratio of the kaolin group hydrated aluminum silicate r1 substance and water glass in the above mixing step is as follows: solid content of water glass: 1
009, the substance has a dry weight of 50 to 200
70%. This is due to the mixing ratio of kaolin group hydrated aluminum silicate substances.

If the amount is less than the above range, the inorganic material will have poor water resistance even after assimilation, and cracks will occur during drying and solidification. Furthermore, if the above range is exceeded, not only will the mixing process not be easily carried out, but also the workability will be poor when forming and coating the resulting inorganic slant. In addition, cracks are likely to occur in the dried and solidified paste, and sufficient strength cannot be obtained after solidification. Moreover, when applied to a base material, it also lacks adhesive strength to the base material. still.

An appropriate amount of water may be added to adjust the viscosity of the inorganic material.

Next, the inorganic material is molded into a predetermined shape depending on the purpose of use, or injection molded into a mold.

It is applied in a film form to the surface of a specimen made of cardboard, wood, metal, ceramics, etc. and solidified to form a molded body. Alternatively, it may be used as a binding phase for the base materials by backing two or more base materials or by injecting it into a gap and solidifying it.

Although the above-mentioned solidification V may be carried out by air drying for a long time at around room temperature, it is carried out while the inorganic material is heated to a temperature of 150 to 500'C. When raising the temperature in this heating step, it is preferable to reach a predetermined temperature at a relatively low temperature increase rate and maintain it for a predetermined time so that the inorganic material does not foam. still,
What is dried and solidified at a temperature near room temperature may be heated and maintained at a temperature within the above temperature range.

By applying this heat treatment, the substance sufficiently fixes the alkali metal ions in the water glass, so the inorganic material has better water resistance and hot water resistance than when solidified at room temperature. Yes, even if the temperature is increased after assimilation at room temperature.

It has superior water resistance and warm water resistance compared to those that do not heat up.

In the present invention, in addition to the water glass and the kaolin group hydrated aluminum silicate substance, additives that do not adversely affect the properties of the water glass may be added as fillers as appropriate. Examples of the additive include 9.

Inorganic substances such as ball sand, chikararanu flour, galanuan fiber, porphyry, vermiculite/antonite, taruri, and amepent.

Organic substances such as natural rubber, emulsions such as chloroprengo A, N15R, and vinyl acetate, aqueous crystal molecular cellulose fibers such as polyvinyl alcohol-1, and the like can be used. When these additives are taken into account, they not only serve as fillers, but also reduce the shrinkage rate of the inorganic material during solidification and prevent the occurrence of cracks. It also exhibits flammability.

Hereinafter, one aspect of the present invention will be explained in detail.

EXAMPLE Kaolin produced in Korea was crushed in a ball mill into particles having a particle size of more than ten microns to obtain a powder of metahalloysite as a kaolin group hydrous aluminum silicate material according to the present invention. The main component of the substance powder is silicon oxide (8102)
and aluminum oxide (AjhOs), the contents of which are 47.3 wt% and 62.8 wt%, respectively. As a result of observation of the material powder using an electron microscope and analysis using X-ray diffraction, it was confirmed that the material was pulp-like metahalloysite.

Next, powder of the substance and water glass (Suigara No. 73) were prepared.

(solid content: 40 wt%) was placed in an alumina pot with an internal volume of 300 cc, and an alumina pot with an inner diameter of 15 m/I was placed.
/300g was added and ball milled to obtain an inorganic material. At this time, the mixing amount of water glass and metahalloysite is
Water glass was ioo4, and metahalosite was mixed in the amount shown in the table. still. When mixing. The metahalloysite powder is.

Easily dispersed in water garanu.

Next, the inorganic material was poured into a mold made by Puwonchik, and after drying at room temperature for 24 hours, the temperature was raised to the temperature shown in the table using a crucible-type nichrome furnace at a heating rate of 1.0 ° C / min. Drying was carried out for 5 hours to obtain inorganic compositions (test numbers f1 to g+).

The obtained inorganic composition was tested for water resistance and hot water resistance. First, the water resistance test was carried out by testing the composition at 100 #
/ in a beaker containing tap water and left at 25°C for 24 hours, and then visually inspected for appearance and shape. Also,
In the hot water resistance test, the composition was immersed in warm water at 60°C for 2 hours and left to stand, and then its appearance and shape were visually examined. the results obtained.

Each is shown in the table.

Further, after the hot water resistance test, the amount of Na20 dissolved in the hot water was titrated using 01N hydrochloric acid. The results are shown in the table.

For comparison, inorganic compositions were obtained using the same amount of kaolin as shown in the table, except that the heating temperature was as shown in the table and the inorganic compositions were dried in the same manner as above (Test Nos. 01 to 01).
08).

Water resistance test, hot water resistance test and Na
, 0 elution amount test was conducted. the results obtained.

Each is shown in the table.

Claims (2)

[Claims] (1) A mixing step of mixing water glass and a kaolin-group hydrated aluminum silicate material of 50 to 2 ooy dry weight based on the solid content of 100 y of water glass to obtain an inorganic material; 1. A method for producing an inorganic composition, comprising a heating step of heating to a temperature of °C to solidify. (2) Kaolin group hydrated aluminum silicate substances. A method for producing an inorganic composition according to claim (1), which is a clay mineral whose main component is one or a mixture of two or more of kaolinite, dietskiite, natalite, halloysite, and mechhalloysite. .