KR0163578B1 - Organic and inorganic composite board for double floor boards and its manufacturing method - Google Patents

Abstract

The finely powdered novolac phenolic resin, containing no moisture, is sufficiently mixed with a dehydrator, dried and pulverized paper sludge, using a mixer, and the mixture is pre-pressurized into a plate using a prepress press. The organic / inorganic composite board for double floor board substrates manufactured by molding by heating and pressing using high pressure heat press has superior strength, flame retardancy, processability and water resistance compared to products using particle board, and is lighter than cement and gypsum-based products. Cement concrete due to natural wood texture and minerals derived from wood fibers in paper sludge, which is lighter than steel products, has excellent strength and excellent workability, and is excellent in workability, strength and insulation. Not only does it have a good texture, but it also recycles waste resources. Other manufacturing the double flooring products cheaper than the possible.

Description

[Name of invention]

Organic and inorganic composite board for double floor boards and its manufacturing method

Detailed description of the invention

[Industrial use]

The present invention relates to a double floor board, and more particularly, to an organic-inorganic composite board for a double floor board substrate of high strength, high water resistance, high flame resistance, and high heat resistance. That is, the present invention relates to a technology for producing a board excellent in strength, water resistance, heat resistance, processability and flame retardancy by recycling paper sludge and using it for a double floor board substrate.

[Prior art]

A double floor board is a double floor system for installing wiring under the floor in an office. The computer room is called the free floor and the general office is called the OA floor. The construction of the double floorboard consists of substrates such as concrete, wood, aluminum die-cast, plastic, steel, and support angles such as steel or plastic, and finishes using polyvinyl chloride (PVC) tiles or tile carpets.

Among the boards of the various double floor boards, products having all the properties such as strength, water resistance, flame retardancy, walking feeling, workability, light weight, and workability are rare, and each product has some disadvantages.

For example, while wood-based products using particle boards are cheaper, they are less water-resistant and flame-retardant and less workable at the edges.In order to reinforce the water-resistant and flame-retardant properties of these particle boards, iron and high presses Melamine (HPM) or low press melamine (LPM) should be attached or polyvinyl chloride (PVC) plates attached to the edges. In addition, the particle board has a disadvantage in that the processing site is not smooth and brittle when punching holes or digging grooves to impart functionality to the material. In addition, steel products are excellent in flame retardancy, water resistance and strength, but have a disadvantage of poor workability because of poor walking feeling, heavy weight, and difficulty in cutting and using. Gypsum products and organic and inorganic fiber-reinforced cement products are not only impact resistance, but also poor workability and dust is generated like steel products.

On the other hand, paper sludge, which is increasing in volume every year, is becoming a serious problem for existing paper companies as environmental regulations and laws are expanding around the world. However, most of the paper sludges are not found a stable recycling place, and are treated by passive methods such as incineration or landfilling. However, a huge cost is required and new treatment methods are urgently required.

Accordingly, the inventors have conducted a lot of research, and when producing a board for building materials using paper sludge that causes the environmental problems as described above building materials excellent in strength, water resistance, flame retardancy, walking feeling, workability, light weight and workability It was found that the board could be developed and developed as a double floor board substrate, and it was confirmed that there was an excellent recycling effect in terms of environment.

However, the technology for producing boards for building materials using paper sludge has already been disclosed in Japanese Patent Laid-Open Nos. 57-178859, 61-28099, and Korean Patent Publication Nos. 79-1484, 86-1124, 91-7581, 95-5385, Korean Patent Publication No. 93-17633, 94-19929, and the like, and related technologies are disclosed.

However, in the related art, there is no case in which a high-density board is manufactured and applied to a double floorboard substrate as in the present invention, and further, the related art is a method of using a liquid resin, which is high density as in the present invention. In the case of manufacturing the board, the amount of moisture contained in the raw material is high, making high density manufacturing impossible.

However, in the present invention, it was possible to manufacture a high-density board that can be used for double floor boards by minimizing the water content using a powder-containing novolak phenolic resin containing no moisture.

Among the related technologies mentioned above, the method disclosed in Japanese Patent Laid-Open Nos. 57-178859, 61-28099 and Korean Patent Publication No. 91-7581 is a state in which paper sludge contains a large amount of water with a moisture content of 50% by weight or more. Is a wet method of manufacturing boards by mixing paper sludge and thermosetting resin and then re-watering, redrying, and thermoforming process, which not only causes wastewater in the production process, but also causes other environmental problems, and has undergone dehydration in the previous stage. Even though it contains a considerable amount of water, a large amount of water vapor is released during thermoforming, which results in separation of the upper and lower boards and deformation of the board, which makes it impossible to manufacture high density or express high strength.

In addition, the method proposed in Korean Patent Publication No. 79-1484 is a method of preparing plywood with a pulp residue material and a liquid rosin-modified phenolic resin, which have almost no inorganic matters produced when producing pulp from wood, and the main raw material is resin. The inorganic material used in the present invention is not flame-retardant because it uses pulp residue that is hardly resistant to firearms, rather than papermaking sludge that is evenly coated on cellulose fibers. Since the production of water vapor and gas is a lot of problems, such as separation of the upper and lower boards or deformation of the board is likely to occur, there is a problem in that the strength decreases due to this.

In addition, the method proposed in Korean Patent Publication No. 86-1124 is a manufacturing method in which crests are crushed in addition to paper sludge to be used as an auxiliary material. After processing urea resin first, pressing and drying using a hot press and regrinding with a grinder As a method of forming a molded article in a state and mixing it with a phenol resin secondly and thermoforming, the process is complicated and consists of several steps. In addition, even if the intermediate molded product produced in the chip state is molded by the weak urea resin and it is secondarily bonded by the phenol resin, the inside of the intermediate molded product in the chip state is bonded by the weak urea resin. There is a problem that can not be expressed.

In addition, the method proposed in Korean Patent Application Publication No. 94-19929 has a particle size of 2-5 mm and a water content of 15 wt% or less in the ratio of thermosetting resins 2-4 with respect to water 8-6 with respect to water 8-6. The water-dilute resin liquid is absorbed into the paper sludge fragments by injecting a very thin diluted thermosetting resin (urea, melamine, phenolic resin) into the injector, and then drying the water content within 8% by weight and then grinding again. There is a disadvantage in that there is a lot of power loss due to redrying and regrinding, and the manufacturing process is complicated, and the water-dilution resin is absorbed by the above-mentioned method. It is not an economical recipe because of the high cost of rebuilding. In addition, since the particle size of the paper sludge small piece is 2 to 5 mm and the water dilution resin liquid has a high viscosity as a polymer material, the resin liquid is not penetrated into the paper sludge small piece without being properly mixed with the paper sludge small piece. If the paper sludge fragment and resin mixture are regrinded, there is some paper sludge which is not mixed with the resin. Therefore, the board manufactured by thermo-pressure molding has a low bond strength due to the improper resin coating. There is a weak strength.

In addition, Korean Patent Publication No. 95-5385 discloses a method for manufacturing a board using paper sludge and low density polyvinyl chloride (PVC). The board manufactured as described above is a thermoplastic resin that is weak to heat or fire unlike a thermosetting resin. Since phosphorus low density polyvinyl chloride (PVC) is used, there is a disadvantage in that deformation due to heat or fire is likely to occur. In addition, Korean Patent Publication No. 93-17633 discloses a method of mixing a thermosetting resin and a thermoplastic adhesive with a papermaking sludge, heating the gel to make a gel, and then thermoforming the gel. It is not necessary to be an economical manufacturing method and because of the use of thermoplastic resins, as in the case of the Republic of Korea Patent Publication No. 95-5385, it is a manufacturing method with the disadvantage that the deformation is easily caused by heat or fire.

[PROBLEMS TO BE SOLVED BY THE INVENTION]

The present invention was developed to solve the problems of the prior art as described above, the first object of the present invention is excellent in strength, water resistance, flame retardancy and processability, light weight, excellent workability, heat insulation, etc., dust generation The present invention provides an organic / inorganic composite board for a double floor board substrate having excellent texture and low cost. That is, the object of the present invention is superior in strength, flame retardancy, processability and water resistance compared to the product using the particle board, lighter than the cement, gypsum-based products, workability, strength, insulation and good dust generation, It is lighter than steel products, has superior strength and excellent workability, and has a natural wood texture derived from wood fibers in paper sludge and cement concrete products derived from inorganic materials. It is therefore an object of the present invention to provide an organic-inorganic composite board for a double floorboard substrate that can be manufactured at a lower price than other double floorboard products.

It is a second object of the present invention to provide a method for effectively recycling paper sludge as waste, and a third object is to use paper sludge as described above, without the occurrence of secondary pollutants, and to have high strength, high flame retardancy, and high water resistance. It is to provide an organic-inorganic composite board for a double floor board substrate having.

[Means for solving the problem]

In the present invention, the above problems can be solved by adopting the following method.

In the present invention, as a main raw material, paper sludge containing a large amount of inorganic material resistant to fire can be used to produce a flame-retardant board as well as to produce water vapor or gas during thermoforming by using a powder-free novolak phenolic resin. It was possible to manufacture a board for a high-strength, high-density double floor board substrate by minimizing the occurrence of the board to suppress defects of the board and solve the reduction in strength.

In addition, since the organic-inorganic composite board for double floor boards of the present invention is mixed with dry paper-making sludge so that the moisture content is within 2 to 5% by weight, dry powdery novolac phenolic resin containing no moisture is mixed. Since the low moisture content of the final raw material mixture can be an economical manufacturing method without the need for redrying and regrinding process. And the paper sludge is a finely ground fine powder with a particle size of 0.5 mm or less, so that each of the fine fibers is evenly separated, so that the resin powder is evenly distributed between the fine fibers and the inorganic material in the paper sludge when mixing the fine powder novolak phenolic resin. By making it possible to be filled and mixed, it was possible to produce a board for a double floorboard substrate capable of expressing high strength.

[Action]

The present invention mixes paper sludge and phenolic powder resin by mixing papermaking sludge sufficiently dried at a water content of 2 to 5% by weight and sufficiently pulverized within a particle size of 0.5 mm and using a powdery novolak phenolic resin containing no water. Since the final moisture content of the mixture is low and additionally no water is used to manufacture the double floorboard board, it is a very economical double designed with a simple process without the need for redrying and regrinding, unlike the prior art. It is a manufacturing method of the board for floorboard substrates.

In addition, the double floorboard substrate board of the present invention is an organic-inorganic composite board, and the inorganic material contained in the paper sludge is evenly coated on the cellulose fibers of the paper sludge or evenly filled between the fibers and has excellent water resistance and flame resistance. Since the cellulose fibers contained in the paper sludge are strongly bonded to the resin and the inorganic material inside the board, it is possible to obtain a board having excellent workability and strength for side processing such as screwing holes or digging holes or grooves on the side of the board.

And since the cellulose fiber, which is the main component in the paper sludge, is wood fiber, it is possible to manufacture a double floorboard substrate board having excellent walking feeling due to the natural wood material.

Accordingly, the double floorboard substrate board of the present invention provides an organic / inorganic composite board for double floorboard substrates having excellent strength, water resistance, flame retardancy, processability, and walking comfort, and at the same time, dry manufacturing to prevent secondary contamination without causing wastewater. By using the method, we provide environmentally friendly products.

That is, if the organic-inorganic composite board for double floorboard substrate of the present invention using powdery novolac phenolic resin is applied as a board of double floorboard, steel, wood, plaster, etc. in terms of strength, water resistance, flame retardancy, processability and walking comfort It is expected to have a wider range of applicability as a superior product to the base and organic / inorganic fiber reinforced cement-based double floorboard products.

[Description of Preferred Embodiment]

Hereinafter, the present invention will be described in more detail.

In the present invention, the paper sludge produced in the papermaking process is sufficiently dehydrated, dried and pulverized within a water content of 2 to 5% by weight and within a particle size of 0.5 mm, and a dry powder of novolak phenol resin containing no moisture is mixed dryly, and the mixture is preliminarily prepared. A high-density, high-strength double floor board substrate organic-inorganic composite board is manufactured by a dry manufacturing method of pre-pressurizing into a plate shape using a pressure press and then heating and pressing using a high pressure heat press.

In addition, in order to reinforce strength, a fiber or fibrous reinforcement may be added to the paper sludge to manufacture an organic / inorganic composite board for a double floor board substrate.

Hardening temperature may vary depending on board thickness, density, hardening time, etc., but in most cases, it is preferable to manufacture at 160 ~ 210 ℃. If the temperature is too low, hardening of resin does not occur or hardening speed Too slow and too high a temperature may lead to pyrolysis of the resin or a fire hazard during manufacture.

In the manufacture of paper sludge boards, it is preferable that the pressurization and decompression pressures during the thermoforming process are alternately performed between 0 and 70 kgf / cm 2 so that the steam and gas generated during thermoforming are sufficiently discharged. . At this time, if the pressure is not sufficiently achieved, it should be noted that problems such as separation of the upper and lower boards or bubbles on the board surface may occur due to the generation of a large amount of water and gas.

In addition, the organic-inorganic composite board for a double floor board substrate manufactured according to the above method preferably has a density of 1.1 to 1.8 g / cm 3 to be used as a board for double floor boards.

Drying of the paper sludge may be a drying method using a hot air or a vacuum drying method, the moisture content of the dried paper sludge is preferably 2 to 5% by weight based on the total weight of the sludge. Dissociation or pulverization may be performed by using a hammer mill or refiner or a combination of primary dissociation in a paddle mixer, where paper sludge is sufficiently pulverized into fine powder within 0.5 mm of particle size.

On the other hand, the paper sludge produced during the papermaking process varies depending on the type of paper produced in the process, and the content of ash or wood fiber varies and its characteristics also vary. However, in the organic / inorganic composite board for double floor board substrate according to the present invention, paper sludge of almost all compositions including 5 to 40% by weight of ash and 60 to 95% by weight of organic matter and wood fibers can be used.

When manufacturing a double floorboard substrate board in the present invention may be a powder-containing novolak phenolic resin containing no water, the addition amount is preferably used 15 to 40% by weight based on the total weight of the raw material mixture, the resin content If it is less than 15% by weight, there is a problem in the strength of the board when applied to the double floor board, and if the resin content exceeds 40% by weight, the board's cost increases or the internal pressure of the board increases due to the generation of a large amount of water vapor or gas during thermoforming. This can lead to product defects in high density manufacturing.

In addition, it is preferable that the organic-inorganic composite board for the double floor board substrate further comprises one selected from the group consisting of 0.5 to 3.0% by weight of a curing agent, 0.5 to 10% by weight of a fiber reinforcing material, a reaction accelerator, and a mixture thereof. It is preferably selected from the group consisting of sodium hydroxide, hexamethyltetramine, potassium hydroxide and mixtures thereof. In this case, if the amount of the curing agent is less than 0.01% by weight, the curing speed of the resin is very slow, and if it is 0.5% by weight or more, it is difficult to achieve even curing of the entire board because hardening occurs on the surface too quickly than in the middle layer of the board.

Among the reinforcement materials that can be used to further provide strength to the organic / inorganic composite board for the double floor board substrate, the organic and inorganic fibers include polymer fibers such as polyester fibers, cellulose fibers, and glass fibers. It is preferable to add 0.5-10 weight% with respect to the total weight of a raw material mixture, and it is preferable to use 1-3 sheets of fiber board reinforcement materials, such as a glass fiber board, per sheet for a double floor board. At this time, when the addition rate of the reinforcing fiber is less than 0.5% by weight, the reinforcing effect is insignificant, and when the content of the reinforcing material exceeds 10% by weight, there is a problem in that it is economical because the price of the material is expensive. In addition, when inserting more than three reinforcing fiber mesh, such as glass fiber mesh that can be used as other reinforcing material has a disadvantage that it is difficult to apply in the manufacturing process.

The double floorboard substrate board manufactured by the method mentioned in the present invention may be further equipped with a height adjustment screw, an outlet boxer seat, or a corner processing to further increase the functionality of the double floorboard when used as a double floorboard. have.

As mentioned above, the composition of the present invention is a manufacturing method for using an organic / inorganic composite board for a double floorboard substrate as a double floorboard substrate, a pretreatment method of paper sludge, a paper sludge raw material composition, a resin and an additive, and a dry manufacturing method. It consists of parts such as a board manufacturing method for a double floor board substrate, improved board functionality and application to a double floor board.

Hereinafter, the present invention will be described in more detail with reference to preferred embodiments of the present invention. However, the following examples are merely provided to more easily understand the present invention, and the present invention is not limited to these examples.

Measure the physical properties of the method of manufacturing the board and the manufactured double floorboard board through the following comparative examples and examples to compare the physical properties with the existing double floorboard products, impose workability or functionality when used as a double floorboard The processing method necessary for this is described.

The paper sludge used in the following examples was dried at a moisture content of 3% by weight using a hot air and pulverized with a hammer mill after primary dissociation in a paddle mixer, and further ground to a particle size within 0.5 mm using a refiner. A powdery novolak phenol resin was used as a hardening agent novolak type phenol powder resin in which 7.5% by weight of hexamethylenetetramine was added to the resin weight as a curing agent. As the reinforcing material, glass fiber net, polyester fiber, and cellulose fiber were used.

The products shown in the following Comparative Example 1 and Comparative Example 2 is a double floor board product of Taejun Co., Ltd., and the product shown in Comparative Example 3 is a product sold by Byucksan Nitobo company as a double floor board.

Comparative Example 1

The product which adhered the board with the following structure by the adhesive was used as a control.

Top plate: Galvanized iron plate 0.25mm thickness

Medium board: Particleboard 30㎜ thick

Bottom plate: 0.25 mm thick galvanized iron plate

Size: Width 500㎜, Length 500㎜

Comparative Example 2

A product of 500 mm wide, 500 mm long and 23 mm thick was made of a 0.8 mm thick galvanized steel sheet, and a cured product was used as a control after inserting a material mixed with cement, silica sand and a mixed material in the center thereof.

Comparative Example 3

Cement, sand and vinylon fibers were mixed and a product of 500 mm in width, 500 mm in length and 25 mm, prepared using a wire mesh as a reinforcing material, was used as a control.

Example 1

25% by weight of the powdered phenol novolak resin added with 7.5% by weight of hexamethylenetetramine was dry-mixed to 75% by weight of the dehydrated, dried and pulverized paper sludge using a mixer, and then Preliminarily pressurize the plate and pressurize and depressurize for 10 minutes at a temperature of 175 ° C and a pressure of 0 to 70kgf / cm2 using a high pressure heat press to thermoform the paper sludge board with a density of 1.1g / cm3 and thickness of 25mm. Prepared.

Example 2

Papermaking sludge boards were manufactured in the same manner as in Example 1, except that 75% by weight of papermaking sludge, 25% by weight of powdered phenol novolak resin, and a density of 1.3 g / cm 3 were used.

Example 3

Papermaking sludge boards were manufactured in the same manner as in Example 2, except that two glass fiber meshes were inserted in the middle portion.

Example 4

The paper sludge board was manufactured in the same manner as in Example 2, except that 1.5 wt% of the polyester fiber was added as the reinforcing material to the weight of the paper sludge.

Example 5

A paper sludge board was manufactured in the same manner as in Example 2, except that 8% by weight of cellulose fiber was added to the weight of the paper sludge as a reinforcing material.

Example 6

Papermaking sludge boards were manufactured in the same manner as in Example 1, except that 75% by weight of papermaking sludge, 25% by weight of powdered phenol novolak resin, and a density of 1.5g / cm 3 were used.

Example 7

Papermaking sludge boards were manufactured in the same manner as in Example 1, except that 65% by weight of papermaking sludge, 35% by weight of powdered phenol novolak resin, and a density of 1.1 g / cm 3 were used.

Example 8

Papermaking sludge boards were manufactured in the same manner as in Example 1, except that 65% by weight of papermaking sludge, 35% by weight of powdered phenol novolak resin, and 1.3g / cm 3 in density.

Example 9

Papermaking sludge boards were manufactured in the same manner as in Example 1, except that 65% by weight of papermaking sludge, 35% by weight of powdered phenol novolak resin, and a density of 1.5g / cm 3 were used.

In accordance with RS-GZ941 of Germany, the access floor standard for the products manufactured in Comparative Example 1 and Examples 1 to 9 above, the median weight load value when the raised floor plate sag 2 mm and according to KS F 3104 The bending strength was measured, and the result of measuring the water absorption after immersion in water at room temperature (25 ° C.) for 72 hours is shown in Table 1 below.

In addition, the products manufactured in Comparative Example 2 and Comparative Example 3 are shown in Table 1 below by only measuring the centralized load value when the raised floor plate sag 2 mm according to RAL-GZ941 of Germany, the access floor standard.

For the conventional double floorboards of Comparative Examples 1 to 3 and the paper sludge boards prepared according to Examples 1 to 9, the centralized load value for 2 mm deflection was measured according to RAL-GZ941 of Germany, the access floor standard. As a result, the paper sludge boards produced according to all the examples showed a centralized central load value larger than the existing double ridge plate of Comparative Examples 1 to 3.

When the bending strength of the existing double-floor plate of Comparative Example 1 and the paper sludge boards prepared according to Examples 1 to 9 were measured according to KS F 3104, the paper sludge boards manufactured according to the Examples of all cases were found. Has a greater bending strength than the double floorboard using the particleboard of Comparative Example 1.

The absorption rate measured after immersion in water at room temperature (25 ° C.) for 72 hours is compared with the existing double floorboard of Comparative Example 1 with respect to the papermaking sludge board prepared according to Examples 1 to 13. All paper sludge boards prepared according to Example 9 showed remarkably superior results.

The bending strength, the centralized load value, and the weight of the existing double-floored plates of Comparative Examples 1 to 3 and the paper sludge boards prepared according to Examples 1 to 9 were compared. Although similar, the weight is not only light, but the weight is similar, it can be seen that the greater the bending strength and the centralized load value.

Bending strength, centralized load value, and the like of the conventional double floorboards of Comparative Examples 1 to 3 and papermaking sludge boards prepared by reinforcing glass fiber nets, polyester fibers or cellulose fiber reinforcements according to Examples 3 to 5. Comparing the weight, it was found that the weight is light but the bending strength and the centralized load value are very strong. Compared with the paper sludge board manufactured according to Example 2 having the same weight and not including the fiberglass net or the fiber reinforcement, the paper sludge board reinforced with the fiberglass net or the fiber reinforcement has the greater bending strength and the central concentration. The load value is shown.

Comparing workability and workability with respect to the papermaking sludge boards prepared according to Examples 1 to 9 and the existing double parquet plates of Comparative Examples 1 to 3, in the case of Comparative Example 1, the particle board used as the middle plate is a corner. It is easy to be broken in work such as processing, Comparative Example 2 and Comparative Example 3 is composed of a steel plate and cement filled with cement not only difficult to cut and process, but also showed a problem of severe dust generation during cutting. However, in the case of the paper sludge board manufactured according to Examples 1 to 9, the edge processing and cutting were easy and showed excellent workability.

Comparing the walking feeling of the papermaking sludge boards prepared according to Examples 1 to 9 and the existing double floorboards of Comparative Examples 1 to 3, the conventional double floorboard products of Comparative Example 2 and Comparative Example 3 It was composed of and cement material, so the walking feeling was not good. In the case of Comparative Example 1, the galvanized iron plate was attached to the upper and lower boards to reduce the walking feeling, but the particle board, which is the middle board, was found to have good walking feeling. In addition, the paper sludge boards prepared according to Examples 1 to 9 had a wood texture due to the wood fibers included in the paper sludge and showed a better walking feeling.

As shown in the above results, when the paper sludge board according to the present invention is applied as a double floor plate, the physical properties such as centralized load value, bending strength, water resistance, etc. are better than the existing double floor plate, and the weight is light and the walking feeling is good. It was found that it has excellent physical properties than the materials used in the existing double floor plate due to its excellent processing and workability.

[effect]

Wood-based double floorboard products using conventional particle boards are inexpensive as described above, but have low water resistance, flame retardancy, and workability at edges, so that steel plates, high press melamine (HPM) or Low press melamine (LPM) is attached or polyvinyl chloride (PVC) plates are attached to the corners to compensate for water resistance. However, when digging holes or grooves, the machining part is not smooth and brittle and there is no solution to the problem of flame retardancy of the product.

In addition, steel products are excellent in flame retardancy, water resistance and strength, but the walkability is poor, the weight is heavy, and workability is inferior because it is difficult to cut and use. In addition, gypsum products and organic and inorganic fiber-reinforced cement products have not only impact resistance but also poor workability and dust generation as steel products.

However, when the paper sludge board is manufactured and used as a double floorboard product, it is possible to solve many problems occurring in the existing double floorboard products because it is superior in various properties and competitive in price than existing double floorboard products.

When paper sludge board is applied to the raised floor board, it is superior in flame retardancy, processability, water resistance and strength compared to the product using particle board, and it is lighter than cement and gypsum-based products, and it has good workability, strength, insulation, and dust. It does not occur, and it is lighter than steel products, and has superior strength and workability. In addition, unlike conventional cement and gypsum-based products and steel products, the paper sludge board products have the flexibility to impact due to the wood fibers included in the paper sludge. Can be expressed. In addition, when manufacturing by adding glass fiber net, polymer fiber and cellulose fiber as a reinforcing material in the paper sludge board, there is an advantage that it can express the properties required for the existing double floor plate even with a lighter and less thickness product.

In addition, since the paper sludge board is manufactured by recycling waste resources, it has the advantage that it can be manufactured at a lower price than other double floorboard products. By recycling paper sludge, which is classified as a waste resource, as raw materials, it can reduce the total cost of its treatment and it does not require additional processing cost, and thus it can be price competitive in comparison with existing double floorboard products.

And since paper sludge board has excellent strength, water resistance, flame retardancy, durability and processability, it can be applied to exterior wall materials or interior and exterior materials as well as to double floor boards, and to mix and form other functional raw materials in paper sludge board manufacturing process. Because it is easy to apply, it can be applied to other materials that provide functionality.

Claims (9)

Dry finely mixed novolak phenolic resin containing a curing agent without containing water in the dewatered, dried and pulverized paper sludge using a mixer; Prepressurizing the mixture into a plate using a prepress press; Molding by heating under pressure using a high pressure heat press; A method for producing an organic / inorganic composite board for a double floor board substrate comprising a step. The method according to claim 1, further comprising the step of adding a reinforcing material to the above-mentioned sufficiently dewatered, dried and pulverized paper sludge to reinforce strength. The method of claim 1, wherein the heat press forming process is performed by alternating pressurization and depressurization during the thermoforming process at a curing temperature of 160 to 210 ° C. and a pressure of 0 to 70 kgf / cm 2. The manufacturing method of the organic-inorganic composite board for double floor board substrates shape | molding so that it may fully discharge. The method according to claim 1, wherein the double floorboard substrate organic-inorganic composite board has a density of 1.1 to 1.8 g / cm 3 so as to be used as a double floorboard substrate. The organic-inorganic composite board for double floor board substrate is composed of 48 to 83% by weight of the papermaking sludge, 15 to 40% by weight of the fine powder novolak phenolic resin, and 0.5 to 3.0% by weight of the curing agent. Manufacturing method of organic / inorganic composite board for floor board substrate. The organic-inorganic composite board for a double floor board substrate comprises: 48 to 83% by weight of the papermaking sludge, 15 to 40% by weight of the novolak phenolic resin of the fine powder, 0.5 to 3.0% by weight of the curing agent, and 0.5% of the reinforcing material. The manufacturing method of the organic-inorganic composite board for double floor board substrates comprised from -10 weight%. The double floorboard according to claim 1, wherein the papermaking sludge is sufficiently dried and pulverized within a water content of 2 to 5% by weight and a particle size of 0.5 mm, and comprises 5 to 40% by weight of ash and 60 to 95% by weight of organic matter and wood fibers. Manufacturing method of organic / inorganic composite board for board. The method of claim 1, wherein the curing agent is selected from the group consisting of sodium hydroxide, hexamethylenetetramine, potassium hydroxide, and mixtures thereof. The method of claim 2, wherein the reinforcing material is selected from the group consisting of polymer fibers, cellulose fibers, glass fibers, glass fiber nets, and mixtures thereof, and the amount of the reinforcing material is 0.5 to 10% by weight in the case of fibrous reinforcement, and in the case of glass fiber nets. A method for producing an organic-inorganic composite board for a double floor board substrate, wherein the board is inserted in 1 to 3 sheets per board.