KR100845020B1 - Making method of non-combustible vermiculite panel - Google Patents

Abstract

A method for manufacturing a non-combustible vermiculite panel is provided to prevent a product from adhering to a mold, to facilitate demolding of the product, and to require neither unnecessary separation nor cutting processes. A method for manufacturing a non-combustible vermiculite panel includes the steps of: mixing expanded vermiculite, an inorganic binder, an expanded perlite, an inorganic blending agent, and water to prepare a mixture; putting the mixture into a mold, and cold-pressing the mold to produce a molded product; separating the molded product from the mold, and drying the molded product with hot air in a roll type movable press hot blast room; heating and drying the hot-air-dried molded product; and cutting the molded product to produce the non-combustible vermiculite panel.

Description

Vermiculite Non-combustible Panel Manufacturing Method {MAKING METHOD OF NON-COMBUSTIBLE VERMICULITE PANEL}

Also known as vermiculite is vermiculite (vermiculite) belonging to the mica mineral and chemical composition _{^{CMg, Fe 3 +, Al 3}} (Al, Si) 4 O 10 (OH) 2 · As 4H ₂ O, aluminum, magnesium, iron hydroxide silicate It is a clay mineral.

Vermiculite is easily decomposed into acids, has a large cation exchange capacity, and is porous.

In particular, it is an environmentally friendly material that can be used as a thermal insulation filler due to the evaporation of moisture between the crystallization layer and the expansion of the lattice layer and the volume of the inorganic layer.

The present invention relates to a method for producing a low density vermiculite non-combustible panel such as a ship nonflammable using the above characteristics of vermiculite.

As a technology for the vermiculite panel, a method of manufacturing a vermiculite panel for construction, which is formed by mixing vermiculite, limestone powder, and synthetic resin and then compression molding has been filed (Korean Patent Laid-Open Publication No. 1996-0010571).

The above technique is a technique before utilizing the thermal expansion characteristics of vermiculite, which has improved sound insulation and moisture proofing effect and heat resistance, but did not have enough thermal characteristics to be used as a nonflammable material.

In this technology, a 'heat-resistant product and its manufacturing method' (Korean Patent Laid-Open Patent Publication No. 2001-0034854), which is produced by mixing vermiculite and ceramic binder and heating and vacuum-drying, which appears to utilize thermal expansion characteristics of vermiculite, has been applied .

In addition, a sintering vermiculite product and a vermiculite panel using the same, which have been fired after the vermiculite is calcined and then mixed with a binder, have been filed (Korean Patent Laid-Open Publication No. 2001-0102690).

However, the inorganic binder added in the vermiculite panel is not only hardened by heat but also easily adhered to the molding mold, which makes it difficult to separate the product from the molding mold after heat molding, which complicates the production process according to the separation and cutting process and adds cost. There was a problem.

In addition, there is a problem that the density of the top and bottom of the product is not uniform because the hardening of the material occurs at the bottom when the material is put into the heated molding mold bottom.

In addition, due to the high expansion of vermiculite and lack of accurate calculation of the depth of the molding mold, the material is added to the molding mold, pressurized using a mold of the top plate, or pressurized to a constant pressure using another device, and then the material is added again. Because of the molding, the input amount of the material is not constant, which causes a problem in that the density distribution and smoothness of the entire product are uneven.

In addition to the above technology, in the case of a manufacturing process in which the mixed vermiculite raw material is formed in a predetermined thickness through a roll method of pressing, a process of compressing the pressure is relatively difficult to control compared to a press. If mutual adhesion is required, it is difficult to obtain a low density vermiculite non-combustible panel of 600 kg / cm ³ or less, which is the most important consideration when used as a ship nonflammable material due to the use of excessive inorganic binders. There was a problem that the unit price of the product rises due to the line equipment.

The method of manufacturing vermiculite non-combustible panel of the present invention is to solve the above problems, by using a press press method but by applying a cold press method to prevent the product from adhering to the molding mold by preventing the hardening of the inorganic binder in the pressing process. It is intended to make vermiculite non-combustible panels without unnecessary separation and cutting process by making the product easy to separate after molding.

In addition, by using an unheated molding mold, the material contacting the bottom of the molding mold is not cured first, so that the upper and lower densities of the product are made uniform.

In addition, the upper mold or the lower mold is assembled together with the intermediate mold in the shape of male and female to apply a constant pressure throughout the panel to press to uniform the density and surface smoothness of the entire product, eliminating unnecessary additional material injection process To manufacture vermiculite non-combustible panels.

In addition, by using an infrared irradiation apparatus including an infrared heater, the drying time, which is considered to be the biggest difficulty in manufacturing vermiculite panels, is to shorten the drying time to improve the product production speed.

In order to solve the above problems, the vermiculite non-combustible panel manufacturing method of the present invention comprises the steps of preparing a mixture by mixing and stirring expanded vermiculite, inorganic binder, expanded pearlite, inorganic compound, and water; A press molding step of preparing a molding mold, putting a prepared mixture into the molding mold, and then pressing the molding mold to produce a molded article; A hot air drying step of demolding the molded product obtained in the molding step from the molding mold and then hot air drying in a roll type pressurized hot air chamber; An infrared ray drying step of heating and drying the molded article hot-air dried in the hot air drying step; It consists of a cutting step of producing a vermiculite non-combustible panel by cutting the product heat-dried in the infrared drying step.

In addition, the mixture contains 100% by weight of expanded vermiculite, 80 to 90% by weight of inorganic binder relative to expanded vermiculite, 5 to 10% by weight of expanded pearlite relative to expanded vermiculite, and 1 to 3% by weight of inorganic compound compared to expanded vermiculite and expanded Characterized in that formed by mixing 2 to 10% by weight of water compared to vermiculite.

In addition, the water is characterized in that about 4% of the total weight of the mixture is mixed.

In addition, the molding mold is composed of an upper mold, an intermediate mold, a lower mold, each of which is characterized in that it has a male and female form.

In addition, the infrared drying step is characterized in that it is heated and dried by an infrared irradiator equipped with an infrared heater to remove and harden the moisture of the vermiculite and inorganic binder having a low thermal conductivity within a short time.

According to the present invention, the vermiculite non-combustible panel can be produced without unnecessary separation and cutting processes by preventing the product from adhering to the molding mold by preventing hardening of the inorganic binder in the pressing process, thereby making it easy to separate the product after molding.

In addition, by using the unmolded molding mold, the material contacting the bottom of the molding mold is not cured first, so that the density of the upper and lower parts of the product becomes uniform.

In addition, as the upper mold or the lower mold is assembled together with the intermediate mold in the shape of male and female, press and apply a constant pressure throughout the panel to uniformize the density and surface smoothness of the entire product, and do not require unnecessary additional material injection process vermiculite nonflammable Panels are provided.

In addition, by using an infrared irradiation device including an infrared heater, the drying time, which is considered to be the biggest difficulty in manufacturing vermiculite panels, shortens the drying time, thereby improving the product production speed.

In other words, by preforming using unheated male and female molding molds, by providing a constant pressure and a uniform temperature inside and outside, it is possible to improve product quality and productivity as well as by using an infrared irradiation device including an infrared heater. It is to provide a method for producing a vermiculite non-combustible panel that can achieve a continuous manufacturing process by removing the moisture of the inorganic binder of vermiculite of extremely low thermal conductivity within a short time to cure.

Hereinafter, the method for preparing the vermiculite nonflammable panel of the present invention will be described in detail.

1. Mixing step

The mixture is prepared by mixing and stirring the expanded vermiculite, the inorganic binder, the expanded pearlite, and the inorganic compounding agent.

Vermiculite is produced by weathering or deterioration of mica, and it is known that it expands and expands when moisture contained therein is dehydrated and has a fire resistance to a temperature of about 1400 degrees.

Expanded pearlite mainly refers to the crushing of natural glass into pieces and sometimes emits pearl-like light by reflection from the thin air film formed on the pieces.

Such expanded pearlite usually contains 3 to 4% of water, and when the fire is exposed to a temperature of 820 ~ 1100 degrees, the volume is expanded by about 15 to 20 times.

Inorganic binders are used to increase the binding strength between the mixed materials, and cement, gypsum, silicate such as sodium silicate, clay, and the like, and sodium silicate is particularly preferable.

The inorganic compound may use various reinforcing materials or aggregates known as inorganic compounding agents, aggregates, pigments, fixing agents, initial tackifiers, and the like.

Kaolin is suitable to increase the double shock absorption performance, and calcium carbonate to enhance the product strength.

It is also possible to form a mixture of various materials.

In other words, a material obtained by mixing kaolin and calcium carbonate in an appropriate ratio may be used as the inorganic compounding agent.

On the other hand, the above materials are mixed with water to form a mixture, the inventors of the present application has found the optimum mixing ratio that can have a non-combustible performance through repeated experiments.

Specifically, the mixture includes 100% by weight of expanded vermiculite, 80 to 90% by weight of inorganic binder relative to expanded vermiculite, 5 to 10% by weight of expanded pearlite relative to expanded vermiculite, and 1 to 3% by weight of inorganic mixture based on expanded vermiculite. 2 to 10% by weight of water compared to the expanded vermiculite was found that the most non-combustible performance is formed.

2. Press molding step

After the molding mold is prepared, the prepared mixture is introduced into the molding mold, and the molding mold is pressed to prepare a molded article.

Here, the molding mold is preferably composed of an upper mold 10, an intermediate mold 20, and a lower mold 30, and the upper mold 10, the intermediate mold 20, and the lower mold 30 are respectively disposed. As shown in Figure 2 it is preferably arranged to have a male and female form.

In FIG. 2, a state in which the mixture 40 is contained between the intermediate mold 20 and the lower mold 30 is illustrated, and FIG. 3 illustrates a state in which the molded article 41 is formed after the press is completed.

Moreover, when pressing the shaping | molding mold of this invention, it does not have a hot press, but cold press press has the characteristics.

The shape of the molding mold is distinguished from the conventional molding mold, and in the case of the conventional molding mold, a constant pressure is not applied to the mixture when hot press molding using the flat upper mold 10 or the lower mold 30. It is possible to prevent the mechanical strength of the film from being uniform and to form a rough surface.

 In particular, in the conventional press process, there is a problem in that the product is damaged when the molding mold is demolded by the bonding between the blended inorganic binder and the molding die, but in the present invention, the non-heating press method is applied to prevent the bonding between the inorganic binder and the mold.

In addition, by forming a molding mold to have a male and female form, by applying a constant pressure from the upper mold 10 or the lower mold 30 and the intermediate mold 20, it is possible to maintain a uniform mechanical strength and density throughout the panel.

3. Hot air drying step

The molded article obtained in the press molding step is demolded in a molding mold and then hot-air dried in a roll-type mobile pressurized hot air chamber.

In the pressurized hot air chamber, as shown in FIG. 4, the hot air is applied to the hot air chamber in which the heating and pressing rollers 50 are installed on both sides to apply pressure to remove the internal moisture.

4. Infrared drying step

In the hot air drying step, the hot air dried molded product is heated and dried.

At this time, the heating and drying method is characterized in that the heat drying by the infrared irradiation device 60 including an infrared heater.

Reference numeral 70 denotes an infrared irradiation chamber, and reference numeral 80 denotes a conveyor belt.

That is, the infrared irradiation device 60 including the infrared heater removes and hardens the moisture of the vermiculite and the inorganic binder having low thermal conductivity within a short time.

In the case of using the infrared irradiation device 60 including such an infrared heater, when drying by hot air or electrothermal method, dry curing time can be significantly shortened compared to long drying hardening time due to low thermal conductivity of vermiculite. do.

As a result of experiments by the inventors of the present application, when the infrared irradiation apparatus is used, the drying curing time is only 5 to 10 minutes, and it is confirmed that it is completed 3 to 6 times faster than a general hot air or an electrothermal drying method.

5. Cutting step

Vermiculite non-combustible panel is manufactured by cutting a molded product heated in the infrared drying step by using a cutter.

Hereinafter, preferred embodiments of the present invention will be described in detail.

The following examples are intended to illustrate the invention and should not be understood as limiting the scope of the invention.

Example 1 Preparation of vermiculite nonflammable panel 1

5 kg of expanded vermiculite, 4.3 kg of sodium silicate, 500 g of expanded pearlite, 200 g of kaolin, and 100 g of water were placed in a container, mixed, and stirred to prepare a mixture.

After preparing the upper mold 10, the intermediate mold 20, the lower mold 30, as shown in the figure, the intermediate mold 20 is installed on the lower mold 30, the lower mold 30 and the intermediate mold 20 After the mixture was put in the space between the upper mold 10 was installed thereon, the molded product was prepared by applying a pressure of 5,000 kg / to the upper mold (10).

At this time, the space formed by the intermediate mold 20 and the lower mold 30 is to be formed in a size of 1 m, left and right.

Then, after demolding the upper mold (10), the intermediate mold (20), the lower mold (30), the molded article was put into a hot air chamber in which rollers are formed on both sides, and hot air was dried while applying pressure with a pressure roller.

The molded product from the hot air chamber was put into an infrared irradiation chamber equipped with an infrared heater with a rated output of 1 KW, and then heated and dried for 15 minutes.

At this time, the temperature was initially raised at 28 degrees, and the temperature was raised to 200 degrees at 6.14 degrees / min.

The vermiculite non-combustible panel of the present invention was prepared by cutting the molded product after heat drying in units of 10 cm and 15 cm in height.

At this time, the inside and the surface temperature of the molded article by the infrared irradiation device including the infrared heater are shown in Table 1.

As shown in Table 1, when the molded article was heated and dried by an infrared irradiation device including an infrared heater, the internal and surface temperatures rapidly increased in seconds, which drastically shortened the drying time.

<Table 1> Surface and internal temperature of the molded article by the infrared irradiation device including the infrared heater

Elapsed time (sec) 24 48 72 96 120 144 168 192 216 240 Internal temperature (degrees) 79 114 141 159 171 178 185 193 199 202 External temperature (degrees) 60 92 123 137 145 153 160 168 175 182

Example 2 Preparation of Vermiculite Non-combustible Panel 2

Proceed in the same manner as in Example 1, but instead of the infrared irradiation apparatus including an infrared heater by heating in a high temperature chamber to prepare a vermiculite non-combustible panel.

Example 3 Preparation of Vermiculite Nonflammable Panel 3

Proceed in the same manner as in Example 1, instead of the infrared irradiation device containing infrared heaters by heating only by infrared irradiation to prepare a vermiculite non-combustible panel.

Example 4 Preparation of Vermiculite Nonflammable Panel 4

Proceed in the same manner as in Example 1 but instead of 200 g of kaolin was added to the calcium carbonate to prepare a vermiculite non-combustible panel.

<Experimental Example 1> Comparison of temperature during heat drying

In preparing the vermiculite non-combustible panel according to Examples 1 to 3, the surface and internal temperature of the molded product when heating and drying were measured and compared in minutes.

<Table 2> Comparison of surface and internal temperature according to differences in heating and drying methods

division Minutes One 2 3 4 When heating high temperature chamber Internal temperature (degrees) 24 29 33 38 Surface temperature (degrees) 30 36 42 48 In the case of infrared irradiation Internal temperature (degrees) 27 33 39 43 Surface temperature (degrees) 32 39 43 48 Infrared irradiation device including infrared heater Internal temperature (degrees) 128 171 189 202 Surface temperature (degrees) 107 145 165 182

As a result of the experiment, the temperature rising effect of the infrared irradiation device including the high temperature chamber, the single infrared irradiation device, the infrared heater was tested, and the water vapor contained in the vermiculite panel was promoted by the infrared irradiation device including the infrared heater. It was found that the inside and outside of the vermiculite panel was evenly heated and the curing time was significantly shortened.

While the invention has been shown and described with respect to specific embodiments above, it will be appreciated that the invention can be modified and modified in various ways without departing from the spirit or scope of the invention as set forth in the following claims. It will be apparent to those skilled in the art that the present invention can be easily recognized.

In addition, the vermiculite non-combustible panel of the present invention is a low-density non-combustible panel is most preferably used as a non-flammable material for ships, but is not limited thereto, and can also be used as interior and exterior materials of various buildings, interior and exterior materials, vehicles and trains.

1 is a process flow diagram illustrating a method for preparing a vermiculite non-combustible panel of the present invention.

Figure 2 is a schematic cross-sectional view showing before press molding in the vermiculite non-combustible panel manufacturing method of the present invention.

Figure 3 is a schematic cross-sectional view showing after the press molding in the vermiculite non-combustible panel manufacturing method of the present invention.

Figure 4 is a process schematic showing the hot air drying step in the vermiculite non-combustible panel manufacturing method of the present invention.

Figure 5 is a process schematic showing the infrared drying step in the vermiculite non-combustible panel manufacturing method of the present invention.

<Code Description of Main Parts of Drawing>

10: upper mold 20: middle mold

30: lower mold `40: mixture

41: molded article 50: heating press roller

60: infrared irradiation device including an infrared heater

70: infrared irradiation chamber 80: conveyor belt

Claims (4)

In the manufacturing method of vermiculite non-combustible panel, A mixture preparation step of mixing and stirring the expanded vermiculite, the inorganic binder, the expanded pearlite, the inorganic compounding agent, and water to prepare a mixture; Composed of the upper mold 10, the intermediate mold 20, the lower mold 30, each of which is arranged to prepare a molding mold having a male and female form, and then put the prepared mixture into the molding mold and cold press the molding mold Press molding step of producing a molded article; A hot air drying step of demolding the molded product obtained in the molding step from a molding mold and then hot air drying in a roll type pressurized hot air chamber; An infrared drying step of heating and drying the molded article hot-air dried in the hot air drying step; It comprises a; cutting step of manufacturing a vermiculite non-combustible panel by cutting the product heat-dried in the infrared drying step Method for preparing vermiculite nonflammable panel. The method of claim 1, The mixture is 100% by weight of expanded vermiculite, 80 to 90% by weight of inorganic binder relative to expanded vermiculite, 5 to 10% by weight of expanded pearlite relative to expanded vermiculite, 1 to 3% by weight of inorganic compounding agent compared to expanded vermiculite and 2 compared to expanded vermiculite Characterized in that formed by mixing ~ 10% by weight of water, Method for preparing vermiculite nonflammable panel. delete The method of claim 1, The infrared drying step is characterized in that the heat is dried by an infrared irradiation device equipped with an infrared heater to remove and harden the moisture of the vermiculite and inorganic binder having a low thermal conductivity within a short time, Method for preparing vermiculite nonflammable panel.

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