JPS58194772A - Water-resistant hard coating - 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 water-resistant Koga lacquerware made of a mixture of water glass and a magnesium-containing clay mineral, and other ingredients.

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 and highly viscous liquid.

When the water glass is left in the air, the water evaporates,
Because it solidifies, this property can be used to create surface coating materials for inorganic substances. ! As an ingredient or as a thickener.

It is widely used as a binder in architecture, civil engineering, etc.

However, even if the water glass is solidified, when it comes into contact with water, it absorbs water again and returns to a viscous liquid. Therefore, water glass or coating materials, paints, etc. that are mainly composed of water glass cannot be used outdoors in humid places or in places where they come into direct contact with water. Covering materials, paints, f! This is an impediment to expanding the scope of use of such products.

Further, conventional water glass has the disadvantage that when it is heated to 150° C. or higher after solidification, it foams, resulting in a significant decrease in strength and loss of function and appearance as a molded product.

On the other hand, it is known that when calcium, magnesium, or the like is added to water glass in an ionic manner in order to make it water resistant, the water glass exhibits the property of being insoluble in water.

However, when primary ions are added, water glass rapidly gels, resulting in poor workability when molding it into a certain shape or coating it, making it impractical.

The inventor believes that #weakness in water, poor heat resistance,
As a result of intensive research aimed at overcoming the above-mentioned disadvantages of coatings containing water glass as a main component, such as rapid solidification, they came up with an uninvented invention.

That is, one object of the present invention is to make it easy to work with when forming, similar to conventional water gaffs, and to be able to use it outdoors as a building material after solidification.

The purpose of the present invention is to provide a coated product that has water resistance, weather resistance, and heat resistance so that it can be used in high-temperature environments such as ceramics and chemical industries.

The present invention is characterized by comprising water glass, a coloring agent, and a magnesium-containing clay mineral of αl to 100% by weight based on the solid content of the water glass. a It's in the accessories.

The water-resistant hard coating material of the present invention hardens at an appropriate speed, and after solidification has water resistance, heat resistance, and hardness suitable for a coating material. Furthermore, the water-resistant # quality coated material is resistant to UV rays and the like.

It also has the advantage of being less likely to fade and having a long lifespan. Therefore, the water-resistant hard coating can be widely used in the fields of architecture, civil engineering, ceramics, and chemistry.

Hereinafter, non-invention will be explained in more detail.

The water glass used in the present invention is a concentrated aqueous solution of alkali-silicic acid, and the composition of the water glass is 9 moles, usually 1 Na.
zO·n5iOt (n==2-4).

Note that the alkali is generally Na, but 1xlL i
, NHa may also be used.

In addition, the magnesium-containing clay mineral used in the present invention 1 is a mineral having a hydroxyl group rich in reactivity as shown in the table [11i#c/I mineral, and specifically Seviolite (Sepiolite), which is mainly composed of hydrated magnesium silicate.・)l
Atapa A/t)qite (Apu1giLe) whose main component is hydrated magnesium aluminum silicate
) also 1゛1 uniquely palygorskite (
Ralygorskit・), and one or more of these are used.

The magnesium-containing clay mineral in the present invention is:

Commonly known as H-lanten cork (mountain work)
), mountain leather (mountain 1e
It is also called meerschaum in Japan.

This is one type. Muko magnesium-containing clay minerals themselves, polylinear water, each #! *Type 1 aqueous solution has the property of adsorbing various material particles.

The crystal of the magnesium-containing clay mineral has a side of approximately α1μ.
An aggregate of long fibers with a quadrilateral cross section of m.

The aggregate has a large number of holes in the length direction of the fibers.

In the present invention, the above! Gnesium-containing clay minerals are
The ore was crushed. It is in powder form.

Next, the coloring agent used in the present invention is, in principle, colored and is used to color the water-resistant rigid bag according to the present invention. #Specific coloring agents include metal compounds such as subacids such as monopodal potassium, oxides such as zinc oxide, sulfides such as sulfuric acid, calcium sulfide, etc. , inorganic pigments that are insoluble in water or soluble in saliva, metal powders such as full t = rum,
Other natural organic pigments, nitroso pigments.

These include nitro pigments, age pigments, dyes, aqueous solutions of dyes, fluorescent agents such as uranine, as well as aqueous test samples, aqueous emulsion paints, and the like.

The water-resistant hard coating according to the present invention is obtained by mixing and cross-mixing the above-mentioned main raw materials, and then applying the mixture to a base material and solidifying it.

The water-resistant hard coating of the present invention consists of a powder of a magnesium-containing clay mineral and a coloring agent mixed in solidified water glass, and at least a part of the coloring agent is adsorbed to the magnesium-containing clay mineral. This is what we are doing.

The method of mixing and kneading the raw materials is as follows: First, the magnesium-containing clay mineral is mixed and kneaded with the water glass. For mixing, it is preferable to use a crosstalk machine or the like having ordinary rotating blades.

The mixing ratio of the magnesium-containing clay mineral is dry weight, water glass solid content (Mg2.n8koz0M is Na
+K, Lt, NHa, etc. (n=2-4)I
It ranges from 01 to 100% by weight (wt%) with respect to K.

For example, the dry matter of magnesium-containing clay mineral is about 8
It can be obtained by drying at 0°C for 10 hours. In this way, an intermediate mixture in the present invention is obtained.

At this time, if the mixing ratio of the water glass solid content and the magnesium-containing clay mineral is smaller than the range described in *, the intermediate mixture and the coloring agent are easily mixed, and the workability is good, but The mixture does not exhibit the above-mentioned effects after solidification. on the other hand.

When the amount of magnesium-containing clay mineral is more than the above range, the above-mentioned crosstalk is difficult and cracks are likely to occur after solidification.

Next, the coloring agent is mixed into the intermediate mixture.

A coating mixture according to the present invention is obtained by kneading.

The mixing ratio of the above-mentioned colorant to the above-mentioned mixture in the present invention is not determined unconditionally depending on the type of colorant, etc., but for example, in the case of the above-mentioned pigment, it is in the range of about 5 to 60 wt%, and in the case of dye, it is in the range of about 1 to 60 wt%. A range of about 40wL% is desirable.

In the case of the organic or inorganic substance, it is preferable to mix it in an amount α06 to 6 times the volume of the intermediate mixture.

When the mixing ratio of the coloring agent is less than the above ratio, sufficient coloring cannot be achieved, and on the other hand, when it is larger than the above ratio, unnecessary coloring agent is added, which is uneconomical.

Also, in the case of pigments, mixing becomes difficult.

On the other hand, as another method for obtaining the coating mixture i in the present invention, the following method is more preferable.

Firstly, magnesium-containing clay mineral according to the present invention 1
Colorant, hruikt, CaC1z, Alt(SO
a) A bottle containing a multivalent ion such as s or both are mixed in advance in the presence of water, and the magnesium-containing clay mineral is allowed to adsorb the above substance.

The water is mixed with the lath and kneaded to obtain a paint mixture. In this case, adsorption refers to the infiltration of the above substances into the pores of the mineral.

These are ionic bonds, hydrogen bonds, and covalent bonds. Next, the paint mixture obtained by any of the above kneading methods is applied onto the substrate #C.

The above application method is 9 normal brush or trowel application.

Alternatively, a spray method is better. Brush painting.

7'V-te should be set low enough to be easily sprayed.

On the other hand, in the case of applying with a trowel, the viscosity of the m-material mixture should be slightly higher to the extent that initial adhesion to the structure can be obtained. After the coating mixture according to the invention is applied onto a substrate, it is left to solidify.

The above-mentioned solidification is carried out by natural drying at room temperature or, if necessary, by baking at high temperature.

As described above, a water-resistant hard coated article according to the present invention can be obtained.

The water-resistant hard coated article according to the present invention has good water resistance. That is, even if water is sprinkled on the surface of the water-resistant hard-coated object and rubbed, the water in the water-resistant hard-coated object will disappear.
Not only does it not dissolve, but even if it is left in hot water at 60° C. for a long period of time, neither dissolution nor even swelling is observed.

The coloring agent added to the water-resistant hard coating according to the present invention is adsorbed to magnesium-containing clay minerals, so it can be decolorized and
It has little fading and has a long life as an m-material. In particular, when the colorant and the magnesium-containing clay mineral are mixed and kneaded in advance, the adsorption ratio is particularly high and the paint has a long life.

In addition, when multivalent ions such as CaC1m and Ah (Soa)i are mixed in advance with clay minerals containing tr and 'vgnesium and adsorbed, the solidified water becomes particularly resistant to hot water. It has excellent characteristics.

Furthermore, since the water-resistant hard coating contains water glass that is insoluble in water, it has higher hardness than conventional general coatings. Therefore, even if a force of 151 is applied to the surface, the water-based hard coating is less likely to be destroyed.

Furthermore, the water-resistant hard coating also has heat resistance which is thought to be produced by mixing water glass, which is its main component, with a clay mineral containing magnesilaf. In particular, when an inorganic pigment is mixed, no foaming phenomenon is observed even when the water-resistant hard coating is heated to 400°C.

Although the mechanism by which the water-resistant hard coated product according to the present invention has water resistance and heat resistance is not clear, it is generally thought to be as follows.

The magnesium-containing clay mineral, which is a constituent element in the present invention, contains large amounts of magnesium and calcium, and the magnesium or calcium is converted into ions and released into the water glass. On the other hand, the sodium or potassium ions present in water glass are caused by the above-mentioned magnesium. In other words, the sodium or potassium, which is the cause of water glass's water-soluble properties, is converted into magnesium or calcium, and water glass molecules interact with each other. It is thought that they bind together and exhibit the property of being insoluble in water.

In addition, the magnesium-containing clay mineral in the present invention is
As mentioned above, since it has a large number of pores, it has a strong adsorption power and adsorbs water glass molecules, a colorant, and even water. This results in water resistance.

It is also thought that heat resistance appears.

Note that in order to improve the water resistance and hot water resistance of the water-resistant hard coated product according to the present invention, *Cm, Mg, and AI.

Exposure to an aqueous solution containing polyvalent metal ions such as Zn and Zr for several hours
In order to improve the impact resistance of such a coated product, the present invention also uses natural rubber,
Chloroprene rubber, elastomer latex such as SBR, vinyl acetate, acrylic, epoxy, amine, fluorine 1
M fat, y! Emulsions and polymers such as / -polymers, foams such as polynutylene, polyvinyl alcohol, aqueous solutions of phenol-1 starch, epoxy resins, phenolic resins.

Organic compound powder such as urea resin may also be added.

Alternatively, cement, mortar, gypsum, xi, bentonite, talc, kaolin, glass powder, inorganic foam powder, etc. may be added as a filler, a heat insulation improver, or an anti-shrinkage agent.

The water-resistant hard coating obtained in the above manner is as follows.

It has the following uses:

By forming the coating on the surface of an inorganic porous body such as a glass foam, it is possible to prevent water from entering the inorganic porous body and to provide a coating or coating that has anti-freezing properties. .

It can also be used as a joint material for joints of the above-mentioned inorganic porous bodies.

Furthermore, it can also be used as a coating material for high-temperature containers such as reaction towers in chemical equipment, and as a heat insulating material.

An example of the present invention will be shown below.

Example 1 Commercially available water glass No. 8 (solid content (mainly Nan.

The sepiotate powder and the yellow pigment titanium yellow or vinyl acetate emulsion polymer as a coloring agent were mixed in the proportions shown in Table 1.

A coating mixture according to the invention was obtained. Apply these paint mixtures to the surface of the glass foam using a brush or trowel.
After coating to a thickness of 8 m, the glass foam was left at 80° C. for 10 hours to obtain a glass foam coated with a water-resistant hard coating according to the present invention. The pores of the ff'j foam are
The surface of the coating layer became flat.

First, even when tap water at a temperature of 20° C. was poured onto the coating layer of the glass foam and rubbed with one hand, there was no sign that the coating layer would melt.

Also, cut out a part of each glass foam and
Although it was immersed in warm water at ℃ for one week, the coating layer did not change at all.

Furthermore, although an attempt was made to peel off the coating layer of the glass foam with a piece of iron, it was not possible to make the piece of iron bite into any of the coating layers.

Finally, the glass foam coating layer was kept in an oven at 800° C. for 80 minutes. As a result, the coating layer mixed with the emulsion paint was slightly blackened, but no foaming phenomenon was observed in the coating layer.

As described above, the water-resistant hard coated product according to the present invention has excellent water resistance and heat resistance. Further, the coating work before solidification of the coated product was also easy.

Example 2 Powdered attapulgite 100F was suspended in 14 tons of tap water, and then calcium chloride (CaCI2"
Dissolve the 7HtO) powder at 20 °C.

After leaving it for 2 hours, filter it with F5 paper and reduce the solid content on Oki paper to 10
After drying at 0° C. for 24 hours, a powder of attapulgite adsorbing calcium ions as a magnesium-containing clay mineral according to the present invention was obtained.

On the other hand, CK2O.8SiOt as alkali-silicate
) is prepared to be 40 wt%, and the solid content (K, 0.8SiO*) of the water glass is 10
According to the present invention, 5 parts by weight of the attapulgite powder and 10 parts by weight of titanium oxide as a coloring agent were mixed with the water glass to 0 parts by weight.
A coating mixture according to No. 1 was obtained.

Next, the above paint mixture was applied to a 2W thick alumina plate C using an airless spray gun, and dried at 80°C for 10 hours to form a water-resistant hard coating according to the present invention. I got a painted item.

The coated article was left in running water for 24 hours, but the coated article did not change at all.

Sara? The coated article was immersed in an aqueous calcium chloride solution having a concentration of 57 l/l for 24 hours. As a result.

The coating did not peel off or dissolve during the dipping treatment, and no cracks were generated. Then 100
The coated product did not swell even though it was boiled for 5 hours in hot water at a temperature of 0.9°C, and showed excellent water resistance.

Example 8 Powdered sepiolite 100LI as a magnesium-containing clay mineral in the present invention was mixed with tap water 11t'CI!
The mixture was made cloudy, and phenylene diamine (NH1)2f as a coloring agent was dissolved therein.

Upon addition, phenylene diamine was adsorbed onto the surface of 1c4 hyophite, producing a purple color.

This was filtered through P paper, and the solid matter on the Oki paper was dried at 80° C. for 24 hours to obtain purple sepiolite powder.

On the other hand, the above-mentioned purple sepiolite powder was added to water glass containing 40 wt% of Lito.8SiO* as a solid content and mixed with the above-mentioned purple sepiolite powder in an amount of 50 w4% based on the solid content to obtain a coating mixture according to the present invention. I got it.

The paint mixture was applied to the surface of the glass foam with a brush to a thickness of 0.5 mm, and the mixture was left at room temperature for 20 hours to obtain a water-resistant hard coat according to the present invention.

A water resistant hard coating on the glass foam covered the glass foam and painted it a beautiful purple color.

This hard water-resistant coated product was left in running water at 20° C. for 7 days, but the hard water-resistant coat did not change at all and showed excellent water resistance.

applicant Toyota Central Research Institute Co., Ltd.

Claims (1)

[Claims] (1) Water glass, colorant, and αl-100 for the solid content of water glass! A water-resistant 1l111R painted product characterized in that it consists of a magnesium-containing clay mineral of f.