KR102404635B1 - Manufacturing method of fungus resistant white board - Google Patents

Abstract

The present invention relates to a method for manufacturing a white board having anti-fungal properties, and specifically, a stirring and reaction step of reacting the raw materials by adding the prepared raw materials in a predetermined amount to a stirrer and stirring and mixing; After foaming by adding a foaming agent to the mixture obtained in the stirring and reaction step, extrusion molding in the form of a board in the extrusion mold of the extruder; A first curing treatment step of curing the molded article being rectified in the extrusion mold by heating it with steam; a second curing treatment step of demolding the molding on which the first curing treatment has been completed from the extrusion mold, washing the surface, and curing the washed molding by heating it with steam; and a waterproofing layer forming step of forming a waterproofing layer by spraying a waterproofing agent on the molded article on which the second curing treatment is completed and then drying the molded article.

Description

Method for manufacturing a white board having anti-mold properties {MANUFACTURING METHOD OF FUNGUS RESISTANT WHITE BOARD}

The present invention relates to a method for manufacturing a white board having anti-fungal properties, and specifically, by including white cement, quartz sand, seashell, wollastonite, bamboo powder, white wood pulp, and pinestone as main components, the durability against mold is increased. It is related to the manufacturing technology of the white board.

In general, cement bricks and cement boards used in buildings do not change in volume even when calcined at high temperatures like other minerals.

In general, the cement block used for wall construction of buildings is manufactured by mixing cement, sand, and water. Put it in and go through the curing process.

Although the conventional cement block manufactured as described above has been used as a major building material for a long period of time, it has poor thermal insulation properties as well as poor sound absorption. In summer and winter, when the temperature difference between inside and outside is greatly affected, the problem of mold occurrence is at a serious level.

Accordingly, as an effort to solve the above problems, in Korea Patent No. 10-0720812, a liquid bio-inorganic coating consisting of a lubricating ceramic material and a ceramic mineral for odor removal by adsorption function is applied to the surface finishing treatment of cement products in bamboo extract. A technique for a composition having antibacterial, antifungal and deodorizing action was also proposed to be used.

However, this prior art requires an additional process for the finishing treatment after manufacturing the cement block, causing an increase in manufacturing cost due to the addition of the process, and at the same time reducing the function of antibacterial, antifungal and deodorizing action due to aging of the coating material There was a problem that could not be avoided.

Accordingly, an object of the present invention is to provide a technology for manufacturing a white board with increased durability against mold using white cement, quartz sand, seashell, wollastonite, bamboo powder, white wood pulp, and pinestone as main components.

According to an embodiment of the present invention for achieving the above object, there is provided a method for manufacturing a white board having anti-fungal properties, comprising: agitation and reaction steps of mixing prepared raw materials in a predetermined amount by putting them into a stirrer; After foaming by adding a foaming agent to the mixture obtained in the stirring and reaction step, extrusion molding in the form of a board in the extrusion mold of the extruder; A first curing treatment step of curing the molded article being rectified in the extrusion mold by heating it with steam; a second curing treatment step of demolding the molded product on which the first curing treatment has been completed from the extrusion mold, washing the surface, and curing the washed molding by heating the molded product with steam; and a waterproofing layer forming step of forming a waterproofing layer by spraying a waterproofing agent on the molded product on which the second curing treatment has been completed and then drying it.

In the above-mentioned stirring and reaction step, it is preferable to prepare white cement, quartz sand, seashell, wollastonite, bamboo powder, white wood pulp and pinestone as main components as raw materials, and prepare a flame retardant and a solidification enhancer as auxiliary components.

In addition, the above-described stirring and reaction step, based on 100% by weight of the total raw material, 29.8 to 40.3% by weight of white cement, 12.8 to 17.3% by weight of quartz sand, 11.1 to 15.0% by weight of seashell, 8.5 to 11.5% by weight of wollastonite, bamboo powder It is preferable to include 5.0 to 8.0% by weight, 6.8 to 9.2% by weight of white wood pulp, 4.3 to 5.8% by weight of pinewood, 1.7 to 2.3% by weight of a flame retardant, and 1.7 to 2.3% by weight of a hardening agent.

In addition, when performing the above-mentioned molding step, it is preferable to add and mix the foaming agent in a proportion of 0.9 to 1.2 wt% based on the weight of the mixture obtained in the stirring and reaction step, so that the mixture is extrusion-molded as a molded article having a porous structure. do.

In addition, in the above-described waterproof layer forming step, as a waterproofing agent, it is preferable to spray the molding with a waterproofing agent having a ratio of 0.9 to 1.2% by weight relative to the weight of the molding on which the second curing treatment is completed.

In addition, in the first curing treatment step described above, the molding is cured by exposing the molded product to steam rising to 10 to 15 degrees Celsius per unit time, and the maximum rising temperature of the steam is in a temperature range of 55 to 70 degrees Celsius, and the second curing In the treatment step, the molding is cured by exposing it to steam rising to 10 to 15 degrees Celsius per unit time, but it is preferable to maintain the isothermal temperature for 5 to 7 hours at 55 to 70 degrees Celsius, which is the highest rising temperature of steam. .

In addition, the above-described waterproof layer forming step is preferably performed at a time when it is determined that the internal temperature of the molded article on which the second curing treatment has been completed reaches a temperature that is in equilibrium with the external temperature.

In addition, after performing the above-described waterproof layer forming step, a surface treatment step of polishing the surface of the molding using a sander; And, a dust removal step of removing the dust generated while grinding the molding by means including at least one of compressed air and washing water; it is preferable that more can be performed.

According to an embodiment of the present invention, white cement, quartz sand, seashell, wollastonite, bamboo powder, white wood pulp, and pinestone are included as main components to provide a method for manufacturing a white board with increased durability against mold. there is

In addition, according to an embodiment of the present invention, in addition to the above-described effect of increasing durability against mold, foaming and extrusion molding of a white board to provide a white board having a porous structure, a white board having increased insulation and sound absorption by itself has the effect of providing

In particular, since it does not require an additional process such as adhering a sound absorbing material and a heat insulating material to the conventional white board, it has the effect of lowering the overall process cost and supplying the multifunctional white board to consumers at a low cost.

1 and 2 are flowcharts of a method for manufacturing a white board having mold-preventing properties according to an embodiment of the present invention.
3 and 4 are examples of the composition ratio of raw materials for manufacturing a white board having anti-fungal properties according to an embodiment of the present invention.
5 is a photo of a prototype of a white board having anti-fungal properties according to an embodiment of the present invention.

Hereinafter, various embodiments and/or aspects are disclosed with reference to the drawings. In the following description, for purposes of explanation, numerous specific details are set forth to provide a thorough understanding of one or more aspects. However, it will also be recognized by one of ordinary skill in the art that such aspect(s) may be practiced without these specific details. The following description and accompanying drawings set forth in detail certain illustrative aspects of one or more aspects. These aspects are illustrative, however, and some of various methods may be employed in principles of various aspects, and the descriptions set forth are intended to include all such aspects and their equivalents.

As used herein, “embodiment”, “example”, “aspect”, “exemplary”, etc. may not be construed as an advantage or advantage in any aspect or design described above over other aspects or designs. .

Also, the terms "comprises" and/or "comprising" mean that the feature and/or element is present, but excludes the presence or addition of one or more other features, elements, and/or groups thereof. should be understood as not

Also, terms including an ordinal number such as 1st, 2nd, etc. may be used to describe various elements, but the elements are not limited by the terms. The above terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, a first component may be referred to as a second component, and similarly, a second component may also be referred to as a first component. and/or includes a combination of a plurality of related listed items or any of a plurality of related listed items.

In addition, in the embodiments of the present invention, unless otherwise defined, all terms used herein, including technical or scientific terms, are those commonly understood by those of ordinary skill in the art to which the present invention belongs. have the same meaning. Terms such as those defined in a commonly used dictionary should be interpreted as having a meaning consistent with the meaning in the context of the related art, and unless explicitly defined in an embodiment of the present invention, an ideal or excessively formal meaning is not interpreted as

The present invention relates to a method for manufacturing a white board having anti-fungal properties, and the present invention uses white cement, quartz sand, seashell, wollastonite, bamboo powder, white wood pulp, and pinestone as main components to increase the durability against mold. An object of the present invention is to provide a technology for manufacturing an old white board.

As a description of the present invention for achieving the above object, the present invention will be described in more detail below with reference to the accompanying drawings, and a plurality of drawings to explain one or more technical features or components constituting the invention This could be a concurrent reference.

Referring to FIG. 1 , there is shown a flowchart of a method of manufacturing a white board having mold-preventing properties according to an embodiment of the present invention.

As shown in FIG. 1 , in the present invention, a stirring and reaction step (S10) of reacting the raw materials by adding the prepared raw materials to a stirrer and stirring them in a predetermined amount may be performed.

Specifically, in step S10 described above, a main ingredient raw material and an auxiliary ingredient raw material may be largely prepared as raw materials.

More specifically, as the above-mentioned main ingredient raw material, a raw material containing at least any one of white cement, quartz sand, seashell, wollastonite, bamboo powder, white wood pulp, and pinestone may be prepared. A raw material including at least one of a flame retardant and a solidification enhancer may be prepared.

At this time, the above-mentioned white cement, also called white cement, contains the amount of iron oxide at a level of 0.6 to 1%, so that the hydration and other properties are the same as that of ordinary cement, but white cement. can be understood as a concept.

Since such white cement has a white color, it has the characteristic that it can be processed into various colors by mixing or coloring pigments. 29.8 to 40.3% by weight based on 100% by weight of the total raw material.

In addition, the above-mentioned quartz sand is sand composed of small grains of quartz, and can be usually obtained from granite, rhyolite, metamorphic rock, and sedimentary rock. It has a hexagonal crystal form and is made of reticulated silicon dioxide, has a Mohs hardness of 7, and has a specific gravity of 2.65, and colorless, transparent, or milky-white quartz sand can be used.

Preferably, the above-mentioned quartz sand may be included in an amount of 12.8 to 17.3% by weight based on 100% by weight of the total raw material.

In addition, the above-mentioned shells are also called shells or shells, and are hardened calcareous shells secreted from the mantle of mollusks, 95% inorganic salts (most of them are calcium carbonate, 1 to 2% calcium phosphate, It contains less than 0.5% of magnesium carbonate) and protein conchiolin.

At this time, when the above-mentioned calcium carbonate is calcined and reacted with water, it becomes calcium hydroxide having excellent reactivity with sulfur oxides, and the calcium hydroxide obtained in this way can be used as a desulfurization raw material superior to limestone. It can provide the effect of upcycling clam shells and the like.

On the other hand, the above-mentioned clam shells may be included in an amount of 11.1 to 15.0% by weight among 100% by weight of the total raw material, and all of the above-mentioned shells are replaced with oyster shells having similar components, or a predetermined ratio (weight As a standard, clam shells 4 to 6: oyster shells 6 to 4) may be mixed and used, and the present invention is not limited thereto.

In addition, the raw material described above may include wollastonite as described above. Specifically, the above-mentioned wollastonite is a silicate mineral containing calcium, and has a white or grayish-white color.

It is possible to increase the strength while reducing the shrinkage phenomenon during the manufacture of white board due to low carbon dioxide gas emission, and to increase the manufacturing efficiency by increasing the heating rate. It shows heat insulation, water content and low oil absorption.

Preferably, the above-described wollastonite may be included in an amount of 8.5 to 11.5% by weight of 100% by weight of the total raw material.

In addition, the above-mentioned raw material may include bamboo powder. At this time, the above-mentioned bamboo powder is not subjected to a separate processing treatment, and bamboo powder obtained by drying and pulverizing bamboo may be used. Preferably, the bamboo is heated at a temperature of 121.3 degrees Celsius or 121.3 degrees Celsius or higher for 15 to 30 minutes. It is preferable to use a powdered product after heat treatment with the steam of, and to contain 5.0 to 8.0% by weight among 100% by weight of the total raw material.

This can be understood to be aseptically processed by heat-treating bamboo with high-temperature steam having a temperature of 121.3 degrees Celsius, and the processed bamboo powder provides an anti-fungal effect, moisture adsorption effect, and deodorizing effect by antibacterial action. can do.

In addition, the above-mentioned raw material may include white wood pulp. Specifically, the white wood pulp is made of cellulose fibers obtained from vegetable materials or vegetable waste fibers, and is made of pine, spruce, poplar, aspen, beech, chestnut, and bamboo. , may be obtained by processing a tree containing at least one of eucalyptus. However, wood pulp has a white color without performing a separate processing treatment, while some have a brown color. It will be possible to achieve the purpose of providing a white board by increasing the whiteness using

In addition, the aforementioned white wood pulp may be included in an amount of 6.8 to 9.2% by weight based on 100% by weight of the total raw material.

In addition, the above-mentioned raw material may include pinestone, which is also called pitchstone, is produced by rapid cooling of acid lava, and has a glassy characteristic with few semi-crystals, which are relatively large crystals, and preferably whole 4.3 to 5.8% by weight may be added based on 100% by weight of the raw material.

In addition, the above-mentioned raw material may include a flame retardant and a solidification enhancer as described above as auxiliary components.

Specifically, the above-described flame retardant may be understood as a concept of a treatment agent for preventing continuous combustion or spreading when the flame is removed after igniting a flame on the manufactured white board.

For example, as the above-described flame retardant, a flame retardant that imparts a semi-permanent or permanent flame retardant performance is preferably used, and at least one of ferric oxide, stannous oxide lead monooxide, manganese dioxide, and antimony oxychloride or , urea monophosphate, THPC (tetrakishydroxymethyl phosphonium chloride), 　 APO (1-aziridinyl phosphine phosphate), phosphoryl amide triallyl phosphate (phosphoryl amide triallyl phosphate), In order to prevent this, it is preferable to refrain from using the above-mentioned ferric oxide, stannic oxide, lead monooxide, and manganese dioxide.

In addition, the above-described flame retardant is added in a small amount by adding 1.7 to 2.3% by weight based on 100% by weight of the total raw material, but the flame retardant performance can be maximized when two or more components are used in combination compared to when it is made of any one component. Accordingly, it would be desirable to selectively use two or more components in combination.

Next, the above-mentioned raw materials include the aforementioned solidification enhancer.

Specifically, the above-described solidification enhancer may be understood as an additive material for hardening a liquid material, and is also commonly used as a curing agent and a curing accelerator.

As an embodiment, the above-described solidification enhancer may be used in an amount of 1.7 to 2.3% by weight of potassium thiocyanate based on 100% by weight of the total raw material. In this case, the kind of the above-mentioned solidification enhancer may be used other than the above-described potassium thiocyanate, but the above-described addition range is maintained so as not to impair the composition ratio of the entire raw material.

That is, in step S10 of FIG. 1 , white cement, quartz sand, seashells, wollastonite, bamboo powder, white wood pulp, pinestone, flame retardant and solidification enhancer are added to a stirrer, and the process of stirring and mixing will be understood to be performed. .

At this time, the rotation speed of the stirrer may be maintained at 300 rpm to 2500 rpm, and the stirring time may be 3 to 10 minutes.

On the other hand, after performing the above-described step S10, an extrusion molding step (S20) of adding a foaming agent to the mixture obtained in the above-described step S10 to foam it, and then extruding it in the form of a preset board in the extrusion mold of the extruder is included.

At this time, the above-described blowing agent may be added in a ratio of 0.9 to 1.2% by weight, based on 100% by weight of the total raw material of the mixture obtained in step S10, and the blowing agent is, for example, hydrochlorofluorocarbon is used so that the mixture is porous. It is to be extruded as a molding having a structure.

In the foaming treatment with such a foaming agent, the white board to be manufactured is processed into a foam, and unlike the conventional sandwich panel method of attaching a separate insulation and sound absorbing material to improve insulation and sound insulation, the insulation and sound insulation of the white board itself are excellent. It is possible to manufacture white boards with various functionalities without the addition of increased and complicated process steps.

On the other hand, in the extrusion molding in step S20, the mixture obtained by performing the step S10 is put into the cylinder of the extruder equipped with a screw, and the mixture is crushed and mixed in the cylinder by the operation of the screw to an extrusion mold mounted at the cylinder outlet. It is made by carrying out a process to be transferred, and when extrusion-molded in step S20, a first curing treatment step (S30) of curing the molded product rectified in the extrusion mold by heating it with a jiggi is performed.

Specifically, in the above-described step S30, the molding is cured by exposing it to steam rising to 10 to 15 degrees Celsius per unit time, but it will be preferable to use a temperature range of 55 to 70 degrees Celsius with the highest rising temperature of the steam.

The curing treatment conditions in step S30 are effective in minimizing curing cracks and securing long-term strength by maintaining thermal stability by gradually increasing the temperature of steam curing, and in step S30, the temperature rise rate of the molding is moderate. The effect of being able to secure the compressive strength required at the time of removal of the extrusion mold by having a can also be expected.

At this time, in order to minimize the heat loss of steam when performing the above-described step S30, the curing treatment may be performed in a closed boiler room, etc., but the boiler room is equipped with an air conditioning facility for inducing air circulation, Therefore, it is desirable to prevent deterioration of curing quality.

In addition, after performing the above-described step S30, after demolding the molded product on which the first curing treatment has been completed, the second curing treatment step of washing the surface of the molding and heating the washed molding with steam for curing treatment (S40) is performed.

Specifically, in the above-described step S40, the molding is cured by exposing it to steam rising to 10 to 15 degrees Celsius per unit time, but curing to maintain the isothermal temperature for 5 to 7 hours at 55 to 70 degrees Celsius, which is the highest rising temperature of steam, for 5 to 7 hours. processing to be performed.

On the other hand, this second curing treatment condition prevents the occurrence of cracking in the curing temperature by not setting the temperature higher than necessary, while drying shrinkage cracking occurs in the molded product, or the decrease in the internal temperature of the molded product is delayed, so that the curing period It provides an effect that can solve this excessively long problem.

In addition, after performing the above-described step S40, the waterproofing layer forming step (S50) of forming a waterproofing layer is performed by spraying the waterproofing agent on the molded article on which the second curing treatment is completed and drying the molded article.

At this time, in the step S50 described above, a waterproofing agent having a ratio of 0.9 to 1.2% by weight with respect to 100% by weight of the total raw material is sprayed to the molding to form a waterproofing layer. Soda-based, siliceous powder-based, fatty acid-based, one of the common waterproofing agents such as paraffin emulsion may be used.

This waterproofing layer is preferably performed at a time when it is judged that the internal temperature of the molded article on which the second curing treatment has been completed reaches a temperature that is in equilibrium with the external temperature, which indicates that very fine cracks have occurred in the manufactured white board. Assuming that, if the post-process is continued in a state where the internal temperature and the external temperature are not balanced, problems such as growth of cracks occur. It may be understood that this is because it does not progress or can significantly slow the progress of cracks.

Meanwhile, referring to FIG. 2 as another preferred embodiment of the present invention, in the present invention, after performing the waterproofing layer forming step (S50), the surface treatment step (S60) of polishing the surface of the molded product using a sander (S60) and the step S60 A dust removal step (S70) of removing the dust generated while grinding the molding by means including at least one of compressed air and washing water may be further performed.

In addition, although not explicitly shown in FIGS. 1 and 2, a quality inspection step (not shown) of performing a quality inspection of the white board finally manufactured after performing steps S10 to S50 or S10 to S70 may be further included, As items of such quality inspection, it may be understood that the degree of crack occurrence, shape defects, and the like are inspected.

Of course, when the above-described quality inspection step is completed, the packaging and shipping step (not shown) of packaging and shipping the inspected white board as a finished product may be performed.

On the other hand, in 200 and 210 of FIG. 5, a photograph of a prototype of a white board manufactured according to the method for manufacturing a white board having anti-fungal property of the present invention is attached, and in 200 and 210 of FIG. 5, the whiteness of the white board and, It can be seen by checking the schematic shape of the white board.

Also, referring to FIG. 3 , it can be seen that in 100 of FIG. 3, the added weight to the raw material composition ratio of the white board having the anti-fungal property is indicated by the minimum weight and the maximum weight for each raw material.

In addition, in 110 of FIG. 4 , as the most preferred embodiment of the white board having anti-fungal properties, the composition ratio with respect to the added weight of each raw material is more clearly shown.

That is, the white board having antifungal properties of the present invention is based on 100% by weight of the raw material, 35% by weight of white cement, 15% by weight of quartz sand, 12% by weight of seashell, 10% by weight of wollastonite, 9% by weight of bamboo powder, white When 8 wt% of wood pulp, 5 wt% of pinestone, 2 wt% of flame retardant, 2 wt% of solidification enhancer, 1 wt% of foaming agent, and 1 wt% of waterproofing agent are included, the white board with the best whiteness, durability, sound absorption and insulation properties is manufactured It can be understood that it can be done.

On the other hand, water, which is a solvent added for mixing these raw materials, may be understood to be included in an amount of 0.3 to 0.7 parts by weight, based on 1 part by weight of the entire raw material shown in 110 of FIG. 4 .

Overall, according to an embodiment of the present invention, white cement, quartz sand, seashells, wollastonite, bamboo powder, white wood pulp, and pinestone are included as main components to provide a method of manufacturing a white board with increased durability against mold. has the effect of providing.

In addition, according to an embodiment of the present invention, in addition to the effect of increasing the durability against mold as described above, by extruding the white board by foaming, there is an effect of increasing the insulation and sound absorption.

In particular, since it does not require an additional process such as adhering a sound absorbing material and a heat insulating material to the conventional white board, it has the effect of lowering the overall process cost and supplying the multifunctional white board to consumers at a low cost.

As described above, although the embodiments have been described with reference to the limited embodiments and drawings, those skilled in the art will understand that various modifications and variations are possible from the above description. Terms such as "include", "comprise" or "have" described above mean that a component without a particularly opposing description may be embedded, so it does not exclude other components but includes other components It should be construed as being able to include more. In addition, the protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the scope equivalent thereto should be interpreted as being included in the scope of the present invention.

Claims (8)

A method for manufacturing a white board having anti-fungal properties, the method comprising:
A stirring and reaction step of reacting the raw materials by adding the prepared raw materials in a predetermined amount to a stirrer and stirring and mixing;
After foaming by adding a foaming agent to the mixture obtained in the stirring and reaction step, extrusion molding in the form of a board in the extrusion mold of the extruder;
A first curing treatment step of curing the molded product being rectified in the extrusion mold by heating it with steam;
a second curing treatment step of demolding the molding on which the first curing treatment has been completed, in the extrusion mold, washing the surface, and curing the washed molding by heating it with steam; and,
A waterproofing layer forming step of forming a waterproofing layer by spraying a waterproofing agent on the molded article on which the second curing treatment has been completed and then drying it;
The stirring and reaction step,
White cement, quartz sand, seashells, wollastonite, bamboo powder, white wood pulp and pinestone are prepared as the main ingredients as the raw materials,
Prepare flame retardant and solidification enhancer as auxiliary ingredients,
The stirring and reaction step,
Based on 100% by weight of the total raw material, 29.8 to 40.3% by weight of the white cement, 12.8 to 17.3% by weight of the quartz sand, 11.1 to 15.0% by weight of the seashell, 8.5 to 11.5% by weight of the wollastonite, 5.0 to 8.0% by weight of the bamboo powder %, the white wood pulp 6.8 to 9.2% by weight, the pinestone 4.3 to 5.8% by weight, the flame retardant 1.7 to 2.3% by weight, and the solidification enhancer 1.7 to 2.3% by weight as raw materials. A method for manufacturing a white board having
delete delete According to claim 1,
When performing the forming step,
By adding and mixing the foaming agent in a ratio of 0.9 to 1.2% by weight based on the weight of the mixture obtained in the stirring and reaction step, the mixture is extrusion-molded as a molded article having a porous structure. A method for manufacturing a white board having
According to claim 1,
The waterproof layer forming step,
As a waterproofing agent, a method for manufacturing a white board having anti-fungal properties, characterized in that the molded product is sprayed with a waterproofing agent having a ratio of 0.9 to 1.2% by weight relative to the weight of the molding on which the second curing treatment is completed.
According to claim 1,
The first curing treatment step,
Curing treatment by exposing the molded product to steam rising to 10 to 15 degrees Celsius per unit time, wherein the maximum rising temperature of the steam is in a temperature range of 55 to 70 degrees Celsius,
The second curing treatment step,
Mold prevention, characterized in that the molded product is exposed to steam rising to 10 to 15 degrees Celsius per unit time and cured, and the isothermal is maintained for 5 to 7 hours at 55 to 70 degrees Celsius, which is the highest rising temperature of steam. A method for manufacturing a white board having a castle.
According to claim 1,
The waterproof layer forming step,
A method for manufacturing a white board having anti-mold properties, characterized in that the second curing treatment is performed at a time when it is determined that the internal temperature of the molded product has reached an equilibrium temperature with the external temperature.
According to claim 1,
After performing the waterproof layer forming step,
A surface treatment step of polishing the surface of the molding using a sander; and,
A method for manufacturing a white board having mold resistance, characterized in that it may further include a dust removing step of removing dust generated while grinding the molding by means including at least one of compressed air and washing water.

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