KR101707608B1 - Coating foamed vermiculite and its manufacturing method and vermiculite pannel using this - Google Patents

Abstract

The present invention relates to a coating foamed vermiculite, wherein the inside and the outside of the foamed vermiculite are coated in order to keep unique properties of the same and provide doubled tensile strength, thereby preventing the shape deformation between before and after the construction of the panel containing the coating foamed vermiculite. The present invention also relates to a manufacturing method thereof, and to a vermiculite panel using the same. The manufacturing method of coating foamed vermiculite comprises the following steps. After putting the preheated foamed vermiculite which was preheated at a temperature of 100 to 150C into a coating device, a coating agent is sprayed under a condition where hot air with a temperature of 200C or above is provided into the inside of the coating device. Therefore, the inside and the outside of the foamed vermiculite are coated, and the coating foamed vermiculite completes a process of being dried by a rapid cooling cooler.

Description

TECHNICAL FIELD The present invention relates to a coated foamed vermiculite, a method for producing the same, and a vermiculite panel using the same.

The present invention relates to a foamed vermiculite coating, and more particularly, to a coated foamed vermiculite coated with foamed vermiculite and having enhanced strength, a method for producing the same, and a vermiculite panel using the same.

The vermiculite is also referred to as vermiculare because of its property of expanding when heated with minerals belonging to monoclinic having a crystal structure like mica. Three layers of structured mica-like minerals are composed of 8 ~ 16% of the total moisture content of water, water, medium water and crystal water. Two layers of water layer with a distance of 14.4 Å Of exchangeable cations. It is also suitable to be used as a heat-resistant material and a soundproofing material because it is easily decomposed into acid, has high cation exchange capacity, and is excellent in absorption ability.

 When the vermiculite is heated at 800 ° C ~ 1,100 ° C, the water present in the layers turns into water vapor. As the pressure increases, the vermiculite expands 6 ~ 30 times and expands to become porous crystalline vermiculite or foamed vermiculite. And has excellent heat resistance and excellent sound insulation effect.

 However, the porosity of the foamed vermiculite poses a problem that the light weight, tensile strength and heat insulation are significantly deteriorated due to the moisture penetration due to the capillary phenomenon. Especially, when used as a building material, it causes deformation problems before and after the construction.

As a prior art using vermiculite, Korean Patent Registration No. 10-0883056 discloses a sound absorbing material using vermiculite, which is obtained by mixing vermiculite powder and ground powder which are water-removed, granulating by dropping water glass, drying a water- I am suggesting. However, the above technique is a method of granulating vermiculite powder with water glass, and then heating and heating the mixture at 700 to 900 ° C for a second time, so that granules coated with water glass are inflated at least four times, so that molding in a mold is very difficult, It is easy to come.

Korean Patent Laid-Open Publication No. 10-2005-0076271 discloses a method for producing a porous natural mineral such as expanded natural caoutchouc or expanded volcanic material by hot air drying at 130 to 150 ° C to further remove moisture, The technology of coating the surface of natural minerals is proposed.

However, these techniques have limited application to the surface of the vermiculite and expanded vermiculite or only to the external pore surface. In addition, when the vermiculite and the expanded vermiculite are coated, the remaining water is not evaporated and is adsorbed to the inner pores or remains on the coated surface, so that the vermiculite and the expanded vermiculite have an excessively large amount of water.

Further, after the mixed solution containing the silica compound is coated, heat treatment is performed at 200 ° C. to 300 ° C. for 1 hour. However, since the heating and drying method of 100 ° C. or more is applied, the moisture content of the mixed solution coated on the surface of the vermiculite As the mixed solution is dried on the surface of the vermiculite bubbles and the self-hardening of the foamed vermiculite is progressed, the hardened foamed vermiculite is easily broken even by a small external impact, so that not only the overall shape but also the porosity And it was difficult to maintain the inherent physical properties of the abrasive stone.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the problems described above and to provide a method of coating a surface of a porous vermiculite material, The coating material is maintained without loss so as to maximize the tensile strength while maintaining an appropriate water content.

It is still another object of the present invention to provide a panel suitable for building materials with the improvement of the physical properties of the vermiculite bubbles by coating the inside and outside pores of the vermiculite,

In order to solve the above-mentioned problem, the present invention is characterized in that after the foamed vermicite preheated at 100 ° C to 150 ° C is introduced into the coater, the coating material is sprayed under the condition that hot air of 200 ° C or more is supplied into the coater, Coating the entire pores present in the coated foamed vermiculite, and rapidly cooling the coated vermiculite.

Also, the vermiculite is added to the coater and is maintained at 100 ° C or higher.

The coating material may include 30 to 80 parts by weight of sodium silicate, 100 to 150 parts by weight of water, 1 to 10 parts by weight of glycerin, 1 to 10 parts by weight of starch, and 1 to 10 parts by weight of sugar based on 100 parts by weight of vermiculite .

On the other hand, there is provided a coated foamed vermicite panel produced by mixing the coated foamed vermicite, the coated vermiculite, and the inorganic binder prepared by the above-described method, inserting or pressing the molded vermiculite into a molding frame, and then drying using a thermal medium or high frequency There is another feature of the present invention.

According to the above-described constitution, as the inside and the outside pores of the vermiculite are all coated, the physical properties inherent to the vermiculite are improved, and the coated vermiculite having a strength of 3 to 7 times can be provided.

Also, even if the panel is made of the above-mentioned coated vermiculite and the panel is used as a building material in various fields such as heat insulation and sound absorption, it can be used as an excellent building material by improving the shape retention ability before and after construction.

1 is a flowchart according to a manufacturing method of the present invention;
2 is a schematic view of a coating apparatus used in the production method of the present invention.
3 is a photograph of a panel according to an embodiment of the present invention.
4 (a) is a vermiculite photograph, 4 (b) is a foamed vermicite, and 4 (c) is a photograph showing a coated foamed vermiculite according to the present invention.

BRIEF DESCRIPTION OF THE DRAWINGS Fig.

FIGS. 1 to 3 are photographs of a coating apparatus used in the manufacturing method and the manufacturing method of the foamed vermiculite according to the present invention, and a part of the panel manufactured using the coated foamed vermiculite manufactured by the method and apparatus.

First, as shown in FIG. 1, the present invention is applied to a known firing plant in the state of crushed vermicite vermiculite to be suitable for use through appropriate classification by the granularity shown in FIG. 4 (a) And heated to expand the vermiculite. (S10)

4 (b) is obtained through the step S10. After the acquisition, the preliminary heating step (S20) is continued to maintain the vermiculite with a temperature of 100 ° C to 150 ° C. In this case, the term "preheating" in the present invention means that the calcined foamed vermiculite is kept at a temperature of 100 ° C to 150 ° C as the calcined vermiculite is not cooled or dried, When the calcined foamed vermiculite is cooled to a temperature of 100 ° C to 150 ° C in the transfer process, the temperature is set to be 100 ° C to 150 ° C through separate heating. Also, when the temperature of the vermiculite is less than 100 ° C, the coating material is hardly penetrated into the pores formed in the vermiculite vesicles, and nonuniform coating is achieved. On the other hand, when the temperature exceeds 150 ° C., the expanded foamed vermiculite is expanded by 4 to 10 times as much as the expanded foamed pavement is progressed in the sintering step, and the hardness is weakened by the expanded pores and thinned surfaces, There is a problem of losing.

As shown in FIG. 2, the foamed vermiculite in the preheated state in step S20 is agitated and conveyed in a paddle manner while passing through a vermiculite coater provided with a plurality of coating material spraying devices at the upper part and a separate coating material storage tank Followed by a coating step (S30)

In step S30, the coating material is sprayed onto the vermiculite vesicles preheated at 100 ° C to 150 ° C under the condition that hot air of 200 ° C or higher is introduced into the coater, and the coating material is stirred while being gradually transferred in a paddle manner. The coating material is supplied 3 to 5 times by the injection device. At this time, in order to prevent the temperature of the vermiculite entering in the coating step (S30) from dropping to 60-80 deg. C together with the generation of steam, the temperature of the vermiculite is maintained at 100 deg. C to 150 deg. It can be.

In the present invention, the temperature of the vermiculite is maintained at 100 to 150 ° C., thereby preventing the liquefaction of water vapor generated by the vaporization phenomenon caused by the spraying of the coating material, minimizing the function of the inside of the vermiculite bush, When the coating material is sprayed onto the cooled vermiculite without maintaining the temperature of 100 ° C or more, the coating material is prevented from being coated on the surface of the vermiculite bush or on the pores formed therein do.

The principle of expansion of vermiculite is that the pressure inside the vermiculite transforms into the vapor, causing the porous structure in the vermiculite to expand or separate, and in this process, the temperature drops as the water evaporates rapidly. However, the prior art does not disclose the effect of the expanded vermiculite temperature on the coating of vermiculite.

Accordingly, when the coating material is sprayed onto the vermiculite vesicles preheated to 100 to 150 ° C, vaporization occurs while steam is generated, and the temperature of the vermiculite is lowered to 60 to 80 ° C due to the endothermic effect due to the vaporization phenomenon Accordingly, the mechanism of spraying the coating material to the pores of the foamed vermiculite is not limited but is applied only on the surface thereof, but rather the water vapor generated is liquefied and the porosity of the foamed vermiculite is hydrolyzed to lower the physical properties of the coated vermiculite. To solve this problem.

Therefore, in the present invention, it is important to maintain the temperature of the vermiculite at 100 ° C or more through the preheating step and the entire coating process before coating. Even if the coated vermiculite is subjected to drying and molding processes, Is completed.

Also, the coating material used in the above step includes 30 to 80 parts by weight of sodium silicate, 100 to 150 parts by weight of water, 1 to 10 parts by weight of glycerin, 1 to 10 parts by weight of starch and 1 to 10 parts by weight of sugar, based on 100 parts by weight of vermiculite .

When the coating step S30 is completed, the coated vermiculite is rapidly cooled to a cooling device coupled with a refrigerant supplier, for example, a rapid cooling cooler as shown in FIG. At this time, by rapidly cooling the coated vermiculite having a coating temperature of 100 DEG C or more by using a rapid cooling cooler or the like, the coating material is dried and fixed to have a viscous property without being dried on the surface of the vermiculite bush, so that the strength of the foamed vermiculite is improved. Therefore, even in various forming processes such as panel manufacture, coated vermiculite can be maintained in shape without being easily broken by the viscosity of the coating material, thereby improving durability and strength of the product.

In the case of the foamed vermiculite coated with the coating material containing sodium silicate, when the coating material is heated and dried, the coating material component is melted again to liquefy, or the water content of the foamed vermiculite itself is excessively removed, thereby possibly deteriorating the inherent physical properties of the foamed vermiculite It is for solving.

After the cooling step S40, the coated vermiculite is cooled and dried. The coated vermiculite is wrapped in a product room (SILO) through a bucket conveyor, wrapped, and shipped (S50).

Meanwhile, in the present invention, the panel containing the coated foamed vermiculite can be manufactured and utilized as various building materials.

In order to manufacture the panel, the coated foamed vermiculite of the present invention and other inorganic binders including water glass are mixed and inserted into a mold or compressed, followed by drying using a thermal medium or a high frequency wave.

In the case of using a thermal medium, a hot press method can be selected. According to the hot press method, the manufactured coated vermiculite is placed in a preformed mold and compressed. The panel containing the coated foamed vermiculite can be manufactured by applying heat at 150 캜.

Or high frequency microwave can be utilized. After the coated vermiculite is pressed with a primary cooling press, microwaves (magnetron irradiation) high frequency waves are heated to a temperature of 200 to 250 ° C by a conveyor, The panel can be manufactured.

Meanwhile, in the present invention, the flexural fracture load test of the coated and unvulcanized vermiculite panels produced by the above process was performed to demonstrate the improved strength of the coated foamed vermiculite panels. At this time, the general vermiculite veneer panel was produced by baking vermiculite using a hot pressing method.

Common foamed vermiculite panel 300 to 450 N Coated foamed vermiculite panel 1,500 to 2,000 N

As a result of the flexural fracture load test of the coated foamed veneer panel 15 mm and the general foamed veneer panel 15 mm, the coated veneer panel of the present invention exhibited the behavior of maintaining the panel shape without being completely broken before reaching the load of 1,500 N to 2,000 N , And in the case of ordinary foamed vermiculite panel, the behavior completely broken at 300N to 450N, which was 3 to 7 times lower than that of the coated foamed vermiculite panel, was confirmed.

As a result, it is possible to improve the durability and the strength of the vermiculite bubbles by preventing the change in the composition of the coating liquid used in the infiltration and coating of moisture from the outside by coating the whole pores formed in the vermiculite or the outer vermicite as in the present invention, It is possible to obtain a strength of 3 ~ 7 times higher than that of ordinary foamed vermiculite panels even when actual users manufacture panels containing coated vermiculite and use them as building materials. .

Claims (5)

Adding vermiculite to the calcining plant by heating to 800 ° C to 1,100 ° C to expand the vermiculite and heating the vermiculite to maintain 100 ° C to 150 ° C;
The preheated vermiculite is heated to 200 ° C or higher and supplied to the inside of the coater so that the temperature of the foamed vermiculite is maintained at 100 ° C to 150 ° C in the coating step, A coating step of coating all or part of the inner / outer porosity of the foamed vermiculite;
And rapidly cooling the coated vermiculite to a room temperature level. delete The method according to claim 1,
Wherein the coating material comprises 30 to 80 parts by weight of sodium silicate, 100 to 150 parts by weight of water, 1 to 10 parts by weight of glycerin, 1 to 10 parts by weight of starch, and 1 to 10 parts by weight of sugar, Method for the manufacture of coated vermiculite. A coated foamed vermiculite produced by the process of claim 1 or 3. The panel comprising the coated foamed vermiculite according to claim 4, wherein the coated vermiculite is mixed with an inorganic binder, inserted into a molding frame or compressed, and dried using a thermal medium or a high frequency wave.

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