A quasi-noncombustible board and a method for manufacturing the same

Abstract

The present invention relates to a semi-fireproof board and a method for manufacturing the same, wherein a method for manufacturing a semi-fireproof board is provided, comprising the steps of preparing wood fibers as raw materials, preparing magnesium oxide, preparing magnesium sulfate, preparing magnesium chloride, mixing the raw materials, and molding them into a board shape.

Description

Technology Field

[0001] The present invention relates to a semi-fireproof board and a method for manufacturing the same, and more specifically, to a semi-fireproof board and a method for manufacturing the same using wood fiber, which is a plant fiber, magnesium, which is a natural inorganic material, and a natural antimicrobial material. Background Technology

[0002] Generally, according to the "Building Act" and the "Rules on Standards for Evacuation, Fire Protection, and Structures of Buildings," non-combustible materials are defined as materials possessing the property of not burning, including concrete, stone, brick, roof tile, steel, aluminum, glass, cement mortar, and lime; materials whose mass loss rate, etc., is recognized by the Minister of Land, Infrastructure and Transport as a result of testing as prescribed by Korean Industrial Standards under the "Industrial Standardization Act"; and other materials of similar non-combustibility recognized by the Minister of Land, Infrastructure and Transport. "Semi-non-combustible materials" refer to materials possessing properties equivalent to non-combustible materials that comply with the standards prescribed by the Ordinance of the Ministry of Land, Infrastructure and Transport.

[0003] Representative semi-noncombustible materials include gypsum board and mineraltex.

[0004] Gypsum board is a type of building material consisting of a board-like structure made of gypsum and fibrous materials. It is widely used as a semi-noncombustible material because the inherent properties of gypsum itself are non-flammable, and when exposed to flames, water molecules chemically bonded to the gypsum crystals prevent flame propagation and temperature rise, thereby blocking the spread of combustion to nearby structures. However, gypsum board loses its bonding strength and absorbs large amounts of water upon contact, making it highly susceptible to the proliferation of mold and bacteria.

[0005] Mineraltex refers to a building material in the form of panels made using a cotton-like material composed of mineral fibers called mineral wool. Mineral wool is made of inorganic raw materials, so it is non-flammable, has high strength and durability, and possesses characteristics such as maintaining its performance and not aging over time. However, mineral wool has disadvantages, such as the risk of air damage due to the generation of fine fibers, vulnerability to moisture due to its moisture-absorbing properties, and high cost.

[0006] To solve these problems, according to Korean Registered Patent Publication No. 10-0778333, a non-combustible, eco-friendly new building material technology is disclosed, which is manufactured by mixing dried and crushed seaweed with magnesium sulfate, magnesium oxide, industrial pulp, and plant powder.

[0007] However, the above-mentioned conventional technology is merely a matter of mixing a certain amount of pulp and plant powder into a conventional magnesium board and mixing in some dried and crushed agar, and has the disadvantage of not implementing additional functions such as additional durability and flame retardancy reinforcement using natural materials or antibacterial effects using eco-friendly natural materials.

[0008] In addition, according to Korean Registered Patent Publication No. 10-2740161, a flame-retardant and semi-flame-retardant finishing material is disclosed that is structured as a laminated composite material in which wood and magnesium are laminated alternately. However, it merely discloses a structure in which magnesium and wood are laminated alternately, and has the disadvantage of not implementing additional functions such as reinforcing action through chemical action resulting from mixing wood fibers and magnesium at different ratios, additional durability and flame retardancy reinforcement using natural materials, or antibacterial effects using eco-friendly natural materials. Prior art literature

[0009] Korean Registered Patent No. 10-0778333 Korean Registered Patent No. 10-2740161 The problem to be solved

[0010] The present invention aims to overcome the aforementioned conventional problems, and the problem to be solved by the present invention is to provide a semi-fireproof board that is eco-friendly, has excellent flame retardancy, and has excellent antibacterial effects by combining the chemical action of lignin contained in a large amount of wood fibers with magnesium oxide, magnesium sulfate, and magnesium chloride with various natural material extracts including natural antibacterial substances and natural flame retardant materials. means of solving the problem

[0011] According to an exemplary embodiment of the present invention, a semi-fireproof board comprising wood fibers, magnesium oxide, magnesium sulfate, and magnesium chloride is provided.

[0012] Based on 100 weight% of the board, the wood fiber comprises 76 to 78 weight%, magnesium oxide comprises 16 to 17 weight%, magnesium sulfate comprises 2.8 to 3.2 weight%, and magnesium chloride comprises 2.6 to 3.0 weight%.

[0013] The semi-fireproof board further includes an antimicrobial functional additive, and the antimicrobial functional additive further includes an extract from at least one of Mountain Root Bark, Mastic, Marjoram, Sappan Lignum, and Sedum takesimense Nakai.

[0014] Based on 100% by weight of the board, the composition comprises 76 to 78% by weight of wood fiber, 16 to 17% by weight of magnesium oxide, 2.8 to 3.2% by weight of magnesium sulfate, 2.6 to 3.0% by weight of magnesium chloride, and 0.2 to 0.3% by weight of an extract from at least one of Mountain Root Bark, Mastic, Marjoram, Sappan Lignum, and Sedum takesimense Nakai.

[0015] The semi-fireproof board further includes a flame-retardant additive, and the flame-retardant additive further includes an extract from at least one of granite, granodiorite, basalt, basalt fiber reinforced furan composite (BFC), and wollastonite fiber.

[0016] Based on 100% by weight of the board, wood fibers comprise 76 to 78% by weight, magnesium oxide 16 to 17% by weight, magnesium sulfate 2.8 to 3.2% by weight, magnesium chloride 2.6 to 3.0% by weight, an extract from at least one of Mountain Root Bark, Mastic, Marjoram, Sappan Lignum, and Sedum takesimense Nakai 0.2 to 0.3% by weight, granite, granodiorite, basalt, basalt fiber reinforced furan composite (BFC), and wollastonite. An extract from at least one of the fibers (Wollastonite fiber) comprises 0.2 to 0.3 weight%.

[0017] According to another aspect of the present invention, a method for manufacturing a semi-fireproof board is provided, comprising the steps of: preparing wood fibers as raw materials; preparing magnesium oxide; preparing magnesium sulfate; preparing magnesium chloride; mixing the raw materials; and molding the mixed raw materials into a board shape.

[0018] Based on 100 weight% of the board, the wood fiber comprises 76 to 78 weight%, magnesium oxide comprises 16 to 17 weight%, magnesium sulfate comprises 2.8 to 3.2 weight%, and magnesium chloride comprises 2.6 to 3.0 weight%.

[0019] A method for manufacturing a semi-fireproof board further includes a step of preparing an antimicrobial functional additive, wherein the antimicrobial functional additive further includes an extract from at least one of Mountain Root Bark, Mastic, Marjoram, Sappan Lignum, and Sedum takesimense Nakai.

[0020] Based on 100% by weight of the board, the composition comprises 76 to 78% by weight of wood fiber, 16 to 17% by weight of magnesium oxide, 2.8 to 3.2% by weight of magnesium sulfate, 2.6 to 3.0% by weight of magnesium chloride, and 0.2 to 0.3% by weight of an extract from at least one of Mountain Root Bark, Mastic, Marjoram, Sappan Lignum, and Sedum takesimense Nakai.

[0021] A method for manufacturing a semi-fireproof board further includes the step of preparing a flame-retardant additive, and the flame-retardant additive further includes an extract from at least one of granite, granodiorite, basalt, basalt fiber reinforced furan composite (BFC), and wollastonite fiber.

[0022] Based on 100% by weight of the board, wood fibers comprise 76 to 78% by weight, magnesium oxide 16 to 17% by weight, magnesium sulfate 2.8 to 3.2% by weight, magnesium chloride 2.6 to 3.0% by weight, an extract from at least one of Mountain Root Bark, Mastic, Marjoram, Sappan Lignum, and Sedum takesimense Nakai 0.2 to 0.3% by weight, granite, granodiorite, basalt, basalt fiber reinforced furan composite (BFC), and wollastonite. An extract from at least one of the fibers (Wollastonite fiber) comprises 0.2 to 0.3 weight%. Effects of the invention

[0024] According to the present invention, by combining the chemical action of lignin contained in a large amount of wood fibers with magnesium oxide, magnesium sulfate, and magnesium chloride, and various natural material extracts including natural antimicrobial substances and natural flame retardant materials, it is possible to manufacture a semi-fireproof board that is eco-friendly, has excellent flame retardancy, and has excellent antibacterial effects. Brief explanation of the drawing

[0026] FIG. 1 is a diagram showing the manufacturing process of a semi-fireproof board according to one embodiment of the present invention. FIG. 2 is a diagram showing the manufacturing process of a semi-fireproof board according to another embodiment of the present invention. FIG. 3 is a diagram showing the manufacturing process of a semi-fireproof board according to another embodiment of the present invention. Specific details for implementing the invention

[0027] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings.

[0028] FIG. 1 is a diagram showing the manufacturing process of a semi-fireproof board according to one embodiment of the present invention.

[0029] First, the process of preparing wood fiber is performed (S110).

[0030] Wood fiber refers to axial fibrous cells that are the main components of wood; it is a component made of cellulose extracted from woody plants, straw, cottonseed, hemp, and sugarcane, and is also called wood cellulose. There exist mechanical pulp, which is produced by mechanically processing wood or chips, and chemical pulp, which is produced by chemically processing.

[0031] In this embodiment, poplar wood is prepared as the wood fiber.

[0032] Poplar trees are commonly used as an economically viable timber material because they grow quickly, propagate well from cuttings, and have excellent air and soil purification effects. The wood fibers extracted from these poplar trees contain a large amount of lignin. In this embodiment, poplar trees are used as wood fibers, but any other materials that can be used as wood fibers can be used as wood fibers.

[0033] Lignin is a type of organic polymer that forms an important structural material supporting tissues in woody plants, such as conifers and deciduous trees, as well as some algae, and is composed of phenylpropene units. Because it is a compound formed by the polymerization of phenylpropene units that has irregular branches, it is an amorphous polymer that is difficult to hydrolyze by acid. Lignin forms covalent bonds with cellulose and other polysaccharides, and by providing hardness without easily decaying, it is a substance that contributes significantly to the formation of cell walls in wood and tree bark.

[0034] In the present invention, by using wood fibers containing a large amount of such lignin as a material for the semi-fireproof board, it is possible to manufacture a semi-fireproof board that is difficult to decompose, damage, or decay easily by water or acid.

[0035] Next, magnesium oxide, magnesium sulfate, and magnesium chloride are prepared (S120).

[0036] Magnesium is an eco-friendly inorganic material that is lightweight, hard, and possesses excellent fire resistance and heat resistance, and is widely used as an eco-friendly building material. Magnesium boards, manufactured in the form of boards by adding magnesium oxide, magnesium sulfate, and magnesium chloride in certain proportions, are commonly used semi-fireproof boards.

[0037] Magnesium oxide, magnesium sulfate, and magnesium chloride are added to the semi-fireproof board according to the present invention. Here, magnesium oxide improves the fire resistance performance of the board material to reinforce non-combustibility, magnesium sulfate increases the flatness of the board material through mutual gelation with the lignin of the wood fibers, and magnesium chloride increases the bonding strength of the board material to improve the functionality of the board material.

[0038] Next, the process of mixing the raw materials is performed (S130).

[0039] In this embodiment, a semi-fireproof board is manufactured by combining wood fibers, magnesium oxide, magnesium sulfate, and magnesium chloride as the main materials of the semi-fireproof board.

[0040] In the case of this embodiment, based on 100 weight% of the semi-fireproof board material, the wood fibers were included in 76 to 78 weight%, magnesium oxide in 16 to 17 weight%, magnesium sulfate in 2.8 to 3.2 weight%, and magnesium chloride in 2.6 to 3.0 weight%.

[0041] Finally, the process of molding the blended raw materials into a board shape is performed (S140).

[0042] Any molding method generally used to form construction boards is acceptable, such as the hot-press method or a method involving the addition of an adhesive like resin, followed by room-temperature compression, hot-press curing, and cooling.

[0044] FIG. 2 is a diagram showing the manufacturing process of a semi-fireproof board according to another embodiment of the present invention.

[0045] First, the process of preparing wood fiber is performed (S210).

[0046] Next, magnesium oxide, magnesium sulfate, and magnesium chloride are prepared (S220).

[0047] Next, the process of preparing an antibacterial additive is performed (S230).

[0048] In the case of this embodiment, an extract is prepared from at least one of Mountain Root Bark, Mastic, Marjoram, Sappan Lignum, and Sedum takesimense Nakai.

[0049] Mountain Root Bark refers to the root bark of the peony (*Paeonia suffruticosa* Andrews), a deciduous shrub belonging to the Ranunculaceae family. It is harvested between autumn and early spring by removing fibrous roots and stem buds, peeling the root bark, and drying it in a hot stone before use. It is used as a medicinal herb to cool the body, regulate blood circulation, and eliminate blood stasis. Mountain Root Bark possesses antibacterial properties against bacteria such as E. coli, Staphylococcus aureus, Salmonella, and Listeria; antifungal properties against fungi such as Phosphate and Penicillium; and antiviral and antioxidant functions against coronavirus, MERS, and novel influenza viruses.

[0050] Mastic is a resin obtained from the mastic tree (Pistacia lentiscus); it was originally sap that becomes a brittle, translucent resin when dried in the sun. Hippocrates is known to have used mastic for digestive disorders, as a preventative measure against colds, and as an air freshener. Mastic possesses antioxidant, antibacterial, and antifungal properties.

[0051] Marjoram is a perennial plant of the Lamiaceae family native to the eastern Mediterranean coast. Grinding the leaves and using them as a poultice is beneficial for rheumatism and neuralgia; brewing and drinking the tea helps expel toxins from the body, and the leaves facilitate the functioning of the digestive system. Marjoram extract is known to exhibit high antifungal performance equivalent to that of currently widely used organic chemical antifungals, and is therefore considered to have high value as a natural antimicrobial agent.

[0052] Caesalpinia sappan L. is a deciduous small tree or shrub and a subtropical plant. Its stems are covered with numerous characteristic thorns, and its leaves feature prominent veins on the undersides. The flowers are yellow, phalaenopsis, and arranged in terminal panicles. Caesalpinia is distributed across most of the world, excluding Europe; it is primarily harvested in the autumn, and after removing the white sapwood and drying it, it is used as a medicinal herb and is known for its excellent antibacterial properties.

[0053] Sedum takesimense Nakai is an endemic plant found on Ulleungdo Island in Korea and is a perennial herb belonging to the Crassulaceae family. The leaves of Sedum takesimense Nakai have 6-7 pairs of blunt teeth along the margins and are hairless; the upper surface is yellowish-green, and the lower surface is grayish-green. Among the extracts of Sedum takesimense Nakai, a substance called '2,6-di-O-galloylarbutin' is known to have whitening, antibacterial, and antioxidant effects.

[0054] The semi-fireproof board according to the present invention may contain an extract from Mountain Root Bark, so that it is extracted from an easily obtainable natural substance, is harmless to the human body, and can have an added antibacterial effect.

[0055] In addition, the semi-fireproof board according to the present invention may include an extract from mastic, so that it is extracted from natural substances and is harmless to the human body, while also providing antioxidant, antibacterial, and antifungal functions.

[0056] Furthermore, the semi-fireproof board according to the present invention may include an extract from marjoram, thereby providing an eco-friendly semi-fireproof board that is harmless to the human body while adding high antifungal performance equivalent to that of organic chemical antifungal agents.

[0057] Additionally, the semi-fireproof board according to the present invention may include an extract from sappanwood (Caesalpinia sappan L.), so that an antibacterial function can be added by using a natural substance that is easy to purchase, inexpensive, and harmless to the human body.

[0058] Finally, the semi-fireproof board according to the present invention may contain an extract from *Sedum takesimense Nakai*, which is a plant native to pristine regions that grows only on Ulleungdo Island in Korea and has high value, and can provide an eco-friendly semi-fireproof board with added natural antibacterial function.

[0059] Next, the process of mixing the raw materials is performed (S240).

[0060] In this embodiment, as the main material of the semi-fireproof board, a semi-fireproof board is manufactured by combining an extract from at least one of wood fiber, magnesium oxide, magnesium sulfate and magnesium chloride, Mountain Root Bark, Mastic, Marjoram, Sappan Lignum, and Sedum takesimense Nakai.

[0061] In the case of this embodiment, based on 100 weight% of the semi-fireproof board material, the composition includes 76 to 78 weight% of wood fibers, 16 to 17 weight% of magnesium oxide, 2.8 to 3.2 weight% of magnesium sulfate, 2.6 to 3.0 weight% of magnesium chloride, and 0.2 to 0.3 weight% of an extract from at least one of Mountain Root Bark, Mastic, Marjoram, Sappan Lignum, and Sedum takesimense Nakai.

[0062] Finally, the process of molding the blended raw materials into a board shape is performed (S250).

[0064] FIG. 3 is a diagram showing the manufacturing process of a semi-fireproof board according to another embodiment of the present invention.

[0065] First, the process of preparing wood fiber is performed (S310).

[0066] Next, magnesium oxide, magnesium sulfate, and magnesium chloride are prepared (S320).

[0068] Next, the process of preparing an antibacterial additive is performed (S330).

[0069] In the case of this embodiment, an extract is prepared from at least one of Mountain Root Bark, Mastic, Marjoram, Sappan Lignum, and Sedum takesimense Nakai.

[0071] Next, the process of preparing a flame-retardant additive is performed (S340).

[0072] In the case of this embodiment, an extract is prepared from at least one of granite, granodiorite, basalt, basalt fiber reinforced furan composite (BFC), and wollastonite fiber.

[0073] Granite is a type of igneous rock formed when magma cools underground or on the surface, and it is classified by various names depending on the quartz content and the size and content of constituent minerals. It can be widely used as a natural flame-retardant material due to its high compressive strength, strong resistance to weathering, high durability, and easy material acquisition resulting from abundant reserves. It is primarily economical to use quartz powder derived from weathered granite. However, if the proportion of granite extract increases, economic feasibility may decline due to difficulties in processing and increased weight caused by high specific gravity; therefore, it is advisable to use an appropriate mixture.

[0074] Granodiorite is a type of igneous rock formed by the cooling of magma underground or on the surface. It is a coarse-grained leucocratic igneous rock containing Na-plagioclase, orthoclase (perthite), quartz, and one or more types of hydrated mafic minerals. Granodiorite differs from granite in that it contains more plagioclase than alkali feldspar, and because its mafic minerals consist of biotite to amphibole, it has a darker color than granite. It can be widely used as a natural flame-retardant material due to its high compressive strength, strong resistance to weathering, high durability, and abundant reserves that make material acquisition easy. However, if the proportion of extracts derived from granodiorite increases, economic feasibility may decrease due to difficulties in processing and increased weight caused by high specific gravity; therefore, it is desirable to use it mixed in an appropriate ratio.

[0075] Basalt is a type of volcanic rock formed when lava erupted from a volcano cools on the surface. It is a dark-colored, porous volcanic rock with a glassy or fine-grained matrix containing plagioclase and pyroxene phenocrysts. Basalt fiber, produced using basalt, possesses physical properties similar to E-glass fiber and exhibits higher heat resistance than glass fiber, making it suitable as a flame-retardant material. Although it is a porous rock, it has a relatively high density; consequently, it has high compressive strength and strong resistance to weathering, resulting in high durability. Furthermore, due to its abundant reserves and ease of acquisition, it can be widely used as a natural flame-retardant material. However, increasing the proportion of extracts derived from basalt can lead to reduced economic efficiency due to difficulties in processing and increased weight caused by high specific gravity; therefore, it is advisable to use an appropriate ratio.

[0076] Basalt fiber reinforced furan composite (BFC) is a combination of basalt fibers and furan resin. It can be utilized as an eco-friendly flame-retardant material by using basalt fibers, which are produced using basalt and possess physical properties similar to E-glass fibers and higher heat resistance than glass fibers, and furan resin, a natural resin with properties similar to thermosetting resins, obtained by securing furfural (O-CHO) through heating waste remaining after extracting juice from sugarcane such as barley and corn under acidic conditions. Basalt fiber reinforced furan composite, which can reinforce flame retardancy and strengthen the bonding of boards by chemically treating readily available natural materials, can be additionally used as a flame-retardant material.

[0077] Wollastonite is a calcium silicate mineral belonging to the chain-type metasilicate group, consisting of fibrous, radial, acicular, and platy forms. It occurs naturally as a white acicular mineral, and its β crystals are generally fibrous and needle-shaped. It possesses characteristics such as low ignition loss and excellent mechanical properties, as well as a certain affinity with plant fibers. Due to its non-toxicity, odorlessness, non-radioactivity, and other advantages, it is utilized as an eco-friendly building material to replace asbestos, which is harmful to human health. Wollastonite fiber is a mineral fiber processed using natural acicular minerals as the main raw material to produce ultra-fine and ultra-white fibers. In particular, it exhibits excellent wear resistance and reinforcement properties, is resistant to acids and alkalis, and has good synergy with flame-retardant materials, thereby maximizing flame-retardant effects.

[0078] The semi-fireproof board according to the present invention may include an extract from granite, and by adding a natural flame-retardant material that is easy to obtain due to its abundant reserves, it is possible to provide a semi-fireproof board with further reinforced durability and flame retardancy.

[0079] In addition, the semi-fireproof board according to the present invention may include an extract from granodiorite, and by adding a natural flame-retardant material that is easy to obtain due to its abundant reserves, it is possible to provide a semi-fireproof board with further reinforced durability and flame retardancy.

[0080] Furthermore, the semi-fireproof board according to the present invention may include an extract from basalt, and by adding a natural flame-retardant material that is easy to obtain due to its abundant reserves, it is possible to provide a semi-fireproof board with further reinforced durability and flame retardancy.

[0081] Additionally, the semi-fireproof board according to the present invention may include an extract from a basalt fiber reinforced furan composite (BFC), and by adding a natural flame-retardant material that is abundant and easy to obtain, and which can reinforce flame retardancy and strengthen the bonding of the board, it is possible to provide a semi-fireproof board with further reinforced durability and flame retardancy.

[0082] Finally, the semi-fireproof board according to the present invention may include an extract from wollastonite fiber, thereby providing a semi-fireproof board that is particularly excellent in terms of wear resistance and reinforcement, is resistant to acids and alkalis, and has good synergy with flame-retardant materials to maximize the flame-retardant effect.

[0084] Next, the process of mixing the raw materials is performed (S350).

[0085] In this embodiment, as the main material of the semi-fireproof board, a semi-fireproof board is manufactured by combining an extract from at least one of wood fiber, magnesium oxide, magnesium sulfate and magnesium chloride, Mountain Root Bark, Mastic, Marjoram, Sappan Lignum, and Sedum takesimense Nakai, and an extract from at least one of granite, granodiorite, basalt, basalt fiber reinforced furan composite (BFC), and wollastonite fiber.

[0086] In the case of the present embodiment, based on 100 weight% of the semi-fireproof board material, wood fibers comprise 76 to 78 weight%, magnesium oxide comprises 16 to 17 weight%, magnesium sulfate comprises 2.8 to 3.2 weight%, magnesium chloride comprises 2.6 to 3.0 weight%, an extract from at least one of Mountain Root Bark, Mastic, Marjoram, Sappan Lignum, and Sedum takesimense Nakai comprises 0.2 to 0.3 weight%, and a basalt fiber reinforced furan composite material (BFC) of granite, granodiorite, and basalt The extract from at least one of furan composite and wollastonite fiber was included in an amount of 0.2 to 0.3 weight%.

[0087] Finally, the process of molding the blended raw materials into a board shape is performed (S360).

[0089] The above description is merely an exemplary embodiment of the semi-fireproof board and the method for manufacturing the same according to the present invention. The present invention is not limited to the above-described embodiment, and as claimed in the following patent claims, the technical spirit of the present invention extends to the scope in which various modifications can be made by anyone with ordinary knowledge in the field to which the invention belongs, without departing from the gist of the invention.

Claims

Claim 1 A semi-fireproof board, wherein the board comprises wood fibers; magnesium oxide; magnesium sulfate; and magnesium chloride. Claim 2 A semi-fireproof board according to claim 1, characterized in that, based on 100 weight% of the board, it comprises 76 to 78 weight% of wood fibers, 16 to 17 weight% of magnesium oxide, 2.8 to 3.2 weight% of magnesium sulfate, and 2.6 to 3.0 weight% of magnesium chloride. Claim 3 In claim 1, the board further comprises a flame-retardant additive, wherein the flame-retardant additive comprises an extract from at least one of granite, granodiorite, and basalt, and based on 100 weight% of the board, wood fibers comprise 76 to 78 weight%, magnesium oxide comprises 16 to 17 weight%, magnesium sulfate comprises 2.8 to 3.2 weight%, magnesium chloride comprises 2.6 to 3.0 weight%, and the extract from at least one of granite, granodiorite, and basalt comprises 0.2 to 0.3 weight%. A semi-fireproof board characterized by including Claim 4 A method for manufacturing a semi-fireproof board, characterized by comprising the steps of: preparing wood fibers as raw materials; preparing magnesium oxide; preparing magnesium sulfate; preparing magnesium chloride; and mixing the raw materials and completing them into a board shape. Claim 5 A method for manufacturing a semi-fireproof board according to claim 4, characterized in that, based on 100 weight% of the board, the wood fiber comprises 76 to 78 weight%, magnesium oxide comprises 16 to 17 weight%, magnesium sulfate comprises 2.8 to 3.2 weight%, and magnesium chloride comprises 2.6 to 3.0 weight%. Claim 6 Claim 4 further comprises the step of preparing a flame-retardant additive, wherein the flame-retardant additive comprises an extract from at least one of granite, granodiorite, and basalt, and, based on 100 weight% of the board, comprises 76 to 78 weight% of wood fibers, 16 to 17 weight% of magnesium oxide, 2.8 to 3.2 weight% of magnesium sulfate, 2.6 to 3.0 weight% of magnesium chloride, and 0.2 to 0.3 weight% of the extract from at least one of granite, granodiorite, and basalt. A method for manufacturing a semi-fireproof board characterized by the following.

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