KR0163576B1 - Water registance board for construction and manufacturing method thereof - Google Patents

Abstract

A mixture of 50% to 60% by weight of a liquid melamine resin or a powdered melamine resin solution with a solid content of a hardener added to the dewatered, dried and pulverized paper sludge sufficiently is sprayed and mixed, and the mixture is preliminarily plated using a preliminary press. The method of manufacturing a waterproofing board for building materials by pressurizing it by using a high pressure heat press and then molding it firstly provides a manufacturing method of a waterproofing board for building materials with excellent strength, water resistance, flame retardancy and side workability using paper sludge. Secondly, economic boards for economic building materials that do not require inefficient and inexpensive additional processes such as additional redrying and regrinding processes by minimizing the moisture content of the raw material mixture by using sufficiently dried paper sludge and liquid high concentration melamine resin. Third, the effect of paper sludge as waste It provides a way to recycling and fourth, and provides a method of manufacturing the board for the excellent domestic construction materials in the eopeumyeonseo secondary pollutants strength, water resistance and flame retardancy using paper sludge as described above.

Description

[Name of invention]

Building waterproof board and its manufacturing method

Detailed description of the invention

[Industrial use]

The present invention relates to a water-resistant board for building materials having excellent strength and water resistance, which can replace existing gypsum boards and particle board products used for building interiors such as walls, partition fillings, and interior partition materials. Preferably, the present invention relates to a building waterproofing board having excellent strength, water resistance, heat resistance, and flame retardancy produced using paper sludge and melamine resin, and a method of manufacturing the same.

[Private Technology]

Representative products of building materials boards currently used for wall, partition filling and interior partition materials include gypsum board and particle board products. The paper is used in the form attached to the upper and lower sides, but it is weak in strength and must be handled carefully during construction.In addition, the base material for boards attached to the upper and lower sides to absorb strength and reinforce strength Due to its low resistance to moisture, it cannot be used in moist areas, and when it is used for walls, the main raw material is soft gypsum.Therefore, there are many problems in use in areas where the screw holding force is weak and needs processing to attach screws or other materials. have.

Particleboard is a wood-based product using waste wood, which is relatively strong, light, and inexpensive. However, since wood is used as a raw material, water resistance and flame resistance are poor. Therefore, when the moisture absorption, bending strength decreases, thickness expansion, dimensional deformation, etc. appear, and as a result, there is a problem that the particle board can not be used in areas of high moisture or contact with fire. In addition, there are a lot of air gaps due to the wood inside the board, there is a lot of water absorption, and there is a problem that can not be maintained when screwing the board side.

In order to solve the above problems, the polymer sheet is bonded to the upper and lower surfaces of the particle board to supplement the water resistance, and the flame retardant is processed to manufacture the flame retardant board products, but the above method does not sufficiently compensate for the water resistance and the flame resistance. have. In addition, due to gaps in the work of screwing on the side or the weakness of the support, the side has been refrained from processing and assembling the side, and has not found a special solution. Therefore, there is a need to overcome the problems of the above-mentioned gypsum board and particle board and to develop a new building waterproof board having strength, water resistance and flame resistance.

Meanwhile, the amount of paper sludge, which is increasing every year, is being seriously addressed by 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 to treat them, 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 melamine resin having excellent water resistance among the paper sludge and thermosetting resin causing the above-mentioned environmental problems, the construction excellent in water resistance, flame retardancy, rigidity and side workability We found that we can develop domestic water-resistant boards, and we found that there is 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.

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 dewatering and thermoforming process to induce waste water in the production process, which induces another environmental problem, and due to the large amount of water vapor during thermoforming There is a disadvantage that the separation of the lower plate or the deformation of the board is caused thereby it can not express high strength.

In addition, the method proposed in Korean Patent Publication No. 79-1484 is a method of preparing plywood from a pulp residue material and rosin-modified phenolic resin, which has almost no inorganic material produced when producing pulp from wood, and the inorganic material used in the present invention is uniformly applied to cellulose fibers. Unlike coated paper sludge, the pulp material has low flame resistance because it has almost no strong minerals in fire, and in terms of water resistance, most of the cellulose fiber components which are weak to moisture and almost no mineral components with low denaturation due to moisture are also insufficient in water resistance. There are disadvantages.

In addition, the method proposed in Korean Patent Publication No. 86-1124 is a method of crushing crests in addition to paper sludge, which is used as an auxiliary raw material. After processing urea resin first, pressing and drying using a hot press and regrinding with a grinder to form a chip state. The process is complicated and consists of a plurality of stages by mixing the molded product with the phenol resin and thermoforming again to the second time, so the manufacturing cost is high and can not be economical board manufacturing method.

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. Infiltrate very thin diluted thermosetting resin (urea, melamine, phenolic resin) into the injector, so that the water-diluted resin solution is absorbed into the paper sludge fragments and dried again within 8% of water content. There is a disadvantage in that a lot of power loss due to drying and regrinding, and the manufacturing process is complicated, the water dilution of the water dilution resin is very water content of about 50% by weight of water content calculated by the above method, so that it is dried again. Due to the large cost loss, it can not be an economical recipe.

In addition, since the particle size of the paper sludge small piece is 2-5mm and the water dilution resin liquid has a somewhat high viscosity as a polymer material, the resin liquid penetrates into the paper sludge small piece without being properly mixed with the paper sludge small piece. When regrinding the mixture of paper sludge fragment and resin liquid because it does not take place, there is some paper sludge in which the resin is not mixed properly. Therefore, the board manufactured by thermo-pressure molding has a weak bond strength due to the poor resin coating. There is a disadvantage in that the strength is weakened.

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.

In addition, the present inventors have the advantage that the building flame retardant board manufactured using paper sludge and urea resin to replace the gypsum board has superior properties compared to the gypsum board, which is a board for the conventional building materials, and the urea resin has a low price. However, there is a problem that the physical properties of the urea resin itself is somewhat vulnerable to water resistance, and particularly, when using it for kitchen or bathroom, there is a problem that reinforcement of water resistance is required.

[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 to provide a water-resistant board for building materials excellent in strength, water resistance, flame retardancy and side workability using paper sludge, The second purpose is to make economical building material boards that do not require additional inefficient and inefficient additional processes such as additional redrying and regrinding process by minimizing the moisture content of the raw material mixture by using fully dried paper sludge and liquid high concentration melamine resin. The third purpose is to provide a method for effectively recycling the paper sludge as a waste, and the fourth object is to use the paper sludge as described above, without the occurrence of secondary pollutants, strength, water resistance and flame retardancy How to manufacture this excellent waterproofing board for building materials To provide.

[Means for solving the problem]

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

According to the present invention, a highly concentrated melamine resin or a powdered resin, which is dissolved in water, is sprayed and mixed with each other by spraying a highly concentrated melamine resin or a powdered resin having 50% to 60% by weight of solid content with a small amount of water into a paper sludge sufficiently dried within a water content of 2 to 5% by weight. By minimizing the moisture content of the final raw material mixture, the production process is simplified without the need for re-dehydration and re-drying process, and it adopts a dry manufacturing method that does not generate waste water by using no additional water. The manufacturing method of the was developed.

In addition, water and steam during thermoforming of the board are minimized by minimizing the moisture content of the final raw material mixture by using a paper-based sludge sufficiently dried within 2 to 5% by weight of water and a liquid solution of high concentration melamine resin or powdered melamine resin having a solid content of 50 to 60% by weight. By minimizing gas generation, problems such as separation of the upper and lower boards and deformation of the board could be solved.

In the present invention, the paper sludge is pulverized into a fine powder with a particle size of 0.5 mm or less, so that each one of the fine fibers is evenly separated, so that the resin is evenly applied to the fine fibers in the paper sludge. It became possible to manufacture a board showing excellent strength, and by adding a small amount of a water-resistant agent to melamine resin having excellent water resistance, a water resistant board for building materials that can be applied to a part requiring great water resistance could be developed.

[Action]

The present invention uses a paper sludge sufficiently dried at a water content of 2 to 5% by weight and sufficiently ground within a particle size of 0.5 mm, and a highly concentrated melamine resin or powdered melamine resin aqueous solution containing 50 to 60% by weight of solid content that is not diluted with water is sprayed as it is. Since the board is manufactured by a dry manufacturing method which has a low final moisture content of the resin after injection and additionally does not use water, it is very economical for building construction, which is designed as a simple process without the need for redrying and regrinding, unlike the conventional technology. It can be a manufacturing method of the board.

Accordingly, the paper sludge board of the present invention provides a water-resistant board for building materials excellent in strength, water resistance, flame retardancy, and side workability, and at the same time, an environmentally friendly product by using a dry manufacturing method that prevents secondary pollution without causing wastewater. To provide.

That is, if the building waterproofing board of the present invention using melamine resin as a wall, partition filling and built-in partition material, it can have a variety of applicability as a product superior to existing gypsum board and particle board products in strength and water resistance, etc. It is expected to be. In addition, it is expected to have a far superior applicability in applications requiring water resistance, such as for kitchen or toilet, because it shows a remarkably excellent water resistance.

[Description of Preferred Embodiment]

Hereinafter, the present invention will be described in detail.

The present invention is a liquid highly concentrated melamine resin or powdered melamine resin having a water content of 2 to 5 wt% and a particle size of 0.5 mm or less, to which a water-repellent agent is added to increase the flame retardancy to the paper sludge sufficiently dehydrated, dried and ground. Aqueous spray is sprayed with an aqueous solution, and the mixture is preliminarily pressurized into a plate using a preliminary press and then heated and pressurized using a high pressure heat press to manufacture a water-resistant board for building materials.

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 addition, the thermoforming conditions in the manufacture of the board is preferably carried out alternately between pressurization and depressurization during the thermoforming process between a pressure of 0 ~ 50kgf / ㎠ so that the steam and gas generated during the thermoforming is 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. And it is preferable that the building waterproofing board manufactured according to the above method has a density of 0.6-1.1 g / cm 3 for use as a building interior material.

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.

The paper sludge produced during the papermaking process varies in ash content and wood fiber content according to the type of paper. However, in the above-mentioned building waterproofing board according to the present invention, there is less ash swelling and less soft softening due to moisture. The ash content is 20 to 50% by weight, and the organic material and the wood fiber powder contain 50 to 80% by weight. It is preferable.

When manufacturing the paper sludge board according to the present invention, a liquid high concentration melamine resin or powdered melamine resin solution having a solid content of 50 to 60% by weight should be used, which is a final water content of the mixture of paper sludge and resin using a resin having a low moisture content. The purpose is to suppress the defects of the board due to the excessive function by lowering the amount is preferably 10 to 20% by weight of the net resin content excluding the solvent mixed in the resin relative to the total weight of the raw material mixture. At this time, when the amount of resin added is less than 10% by weight, there is a problem in the strength and water resistance of the board. When the amount of resin added is more than 20% by weight, the manufacturing cost of the board is economically increased, and the moisture content of the raw material mixture is increased in manufacturing. The generation of moisture and gas can cause problems such as separation of the upper and lower boards or bubbles on the surface of the board.

In addition to the melamine resin, ammonium chloride, zinc chloride, acid anhydride, or the like can be added as a curing agent. Here, the curing agent is preferably added 0.5 to 2.5% by weight based on the total weight of the resin, which corresponds to 0.01 to 0.5% by weight based on the total weight of the raw material mixture, considering the resin addition rate. At this time, if the addition 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, the curing on the surface occurs too quickly than in the middle layer of the board, it is difficult to achieve even curing of the entire board.

In addition, a water-resistant agent added to further impart water resistance to the paper sludge board may be mixed and sprayed onto paper sludge to be treated during resin injection or impart water resistance to the resin itself. At this time, the addition amount of the water-resistant agent is preferably about 0.2 to 2.0% by weight based on the total weight of the raw material mixture, paraffin wax may be used as the water-resistant agent. In this case, when the amount of the additive is less than 0.2% by weight, the effect of the waterproofing agent is insignificant. When the amount of the additive is more than 2.0% by weight, the water resistance is improved while the strength is slightly lowered.

As mentioned above, the composition of the present invention is a manufacturing method for using paper sludge board as a building interior material, a pretreatment method of paper sludge, paper sludge raw material composition, resins and additives, a method for manufacturing a building domestic board by dry manufacturing method, etc. It consists of parts of.

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.

Through the following comparative examples and examples, the physical properties of the method of manufacturing paper sludge boards and the manufactured waterproofing boards were measured to compare the physical properties of the existing gypsum boards and particle board products.

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. Melamine resin was used as a 50% by weight aqueous solution of Mel-S, a melamine powder resin of Dong-A Chemical, in which ammonium chloride was added 1.5% by weight to the resin weight as a curing agent. Paraffin wax was used as a water resistant agent.

Comparative Example 1

Kumgang Co., Ltd. gypsum board product was used as a control.

Comparative Example 2

A particle board product having a thickness of 12 mm of Hansol Porem Co., Ltd. was used as a control.

Comparative Example 3

11% by weight of a liquid urea resin (based on solids) to which 2% by weight of a curing agent (ammonium chloride) is added is mixed with a sufficiently dehydrated, dried and pulverized paper sludge (89% by weight) and plated using a preliminary press. Preliminarily pressurized and pressurized and depressurized for 10 minutes at a temperature of 175 ° C. and a pressure of 0 to 50 kgf / cm 2 using a high pressure heat press, followed by thermoforming to manufacture a paper sludge board having a density of 0.7 g / cm 3 and a thickness of 12 mm. It was.

Comparative Example 4

Paper Sludge 87% by weight, Urea Resin 13% by weight, Density 0.7g / cm3

The manufacturing method is the same as in Comparative Example 3

Comparative Example 5

Paper Sludge 85% by weight, Urea Resin 15% by weight, Density 0.7g / cm3

The manufacturing method is the same as in Comparative Example 3

Example 1

11% by weight of liquid melamine resin (based on solids) to which 1.5% by weight of a curing agent (ammonium chloride) is added is mixed with a sufficiently dehydrated, dried and pulverized paper sludge (89% by weight), and then plated using a preliminary press. Preliminarily pressurized and thermostatically pressurized and depressurized for 10 minutes at a temperature of 175 ° C. and a pressure of 0-50 kgf / cm 2 using a high pressure heat press to produce a paper sludge board having a density of 0.7 g / cm 3 and thickness of 12 mm It was.

Example 2

Papermaking sludge boards were manufactured in the same manner as in Example 1, except that 87% by weight of papermaking sludge, 13% by weight of melamine resin and 0.7g / cm 3 in density.

Example 3

Papermaking sludge boards were prepared in the same manner as in Example 1, except that 85% by weight of papermaking sludge, 15% by weight of melamine resin, and a density of 0.7g / cm 3 were used.

Example 4

Papermaking sludge boards were manufactured in the same manner as in Example 1, except that 89% by weight of papermaking sludge, 11% by weight of melamine resin and 0.8g / cm 3 of density were used.

Example 5

Papermaking sludge boards were manufactured in the same manner as in Example 1, except that 87% by weight of papermaking sludge, 13% by weight of melamine resin, and a density of 0.8g / cm 3 were used.

Example 6

Papermaking sludge boards were prepared in the same manner as in Example 1, except that 85% by weight of papermaking sludge, 15% by weight of melamine resin, and 0.8g / cm 3 in density.

Example 7

Papermaking sludge boards were manufactured in the same manner as in Example 1, except that 89% by weight of papermaking sludge, 11% by weight of melamine resin, and a density of 0.9g / cm 3 were used.

Example 8

Papermaking sludge boards were manufactured in the same manner as in Example 1, except that 87% by weight of papermaking sludge, 13% by weight of melamine resin, and a density of 0.9g / cm 3 were used.

Example 9

Papermaking sludge boards were manufactured in the same manner as in Example 1, except that 85% by weight of papermaking sludge, 15% by weight of melamine resin, and a density of 0.9g / cm 3 were used.

Example 10

11% by weight of liquid melamine resin (solid content) added with 1.5% by weight of a curing agent (ammonium chloride) is mixed with 1.0% by weight of paraffin wax, which is a water-resistant agent, and sprayed into fully dehydrated, dried and pulverized paper sludge (88% by weight). After pre-pressing into a plate using a prepress press and hot pressing by alternating pressurization and depressurization at a temperature of 175 ° C. and a pressure of 0-50 kgf / cm 2 for 10 minutes using a high pressure heat press to obtain a density of 0.7 g / The paper sludge board of cm <3> and thickness 12mm was manufactured.

Example 11

Papermaking sludge boards were prepared in the same manner as in Example 10, except that 86% by weight of papermaking sludge, 13% by weight of melamine resin, 1.0% by weight of paraffin wax, and a density of 0.7g / cm 3.

Example 12

Papermaking sludge boards were manufactured in the same manner as in Example 1, except that 84% by weight of papermaking sludge, 15% by weight of melamine resin, 1.0% by weight of paraffin wax, and a density of 0.7g / cm 3.

For the products prepared in Comparative Examples 1 to 4 and Examples 1 to 12 above, the bending strength and absorption thickness expansion coefficient when wet, which are properties related to bending strength and water resistance, were measured according to KS F 3104. It is shown in Table 1 below.

As can be seen from Table 1, the bending strength measured after wetting in water at 70 ° C. for 2 hours and at 25 ° C. for 1 hour was compared with the existing gypsum board products of Comparative Example 1 and Examples 1 to 1. In comparison with the paper sludge board manufactured according to 12, it is impossible to measure the strength by absorbing moisture in the existing gypsum board products, while all paper sludge boards manufactured according to Examples 1 to 12 have remarkably excellent results. Indicated.

And the bending strength of the existing gypsum board products of Comparative Example 1 and the paper sludge boards prepared according to Examples 1 to 12 were measured according to KS F 3104. The sludge board showed a greater bending strength than the conventional gypsum board product of Comparative Example 1.

In addition, in comparison with the impact resistance, in the case of the paper sludge board manufactured according to Examples 1 to 12 than the gypsum board product of Comparative Example 1, it has the flexibility against the impact caused by the wood fibers in the paper sludge. It showed stronger impact resistance.

Bending strength and absorption thickness when wet were measured after immersion in water for 2 hours at 70 ° C. and 1 hour at 25 ° C. for the particle board product of Comparative Example 2 and the paper sludge boards prepared according to Examples 1 to 12. In comparison with the expansion rate, most paper sludge boards prepared according to Examples 1 to 12 exhibited better bending strength when wet and less thickness expansion due to moisture absorption than conventional particle board products of Comparative Example 2. It showed strong water resistance.

However, as a result of measuring the bending strength, the existing particle board product of Comparative Example 2 is slightly stronger than the paper sludge board manufactured according to Examples 1 to 12, and thus it is difficult to use in applications requiring high strength. As mentioned, the water resistance is better, so it can have a great advantage when used in applications requiring large water resistance.

The bending strength and absorption thickness expansion rate of the papermaking sludge board using the urea resins of Comparative Examples 3 to 5 and the melamine resin prepared according to Examples 1 to 12 were measured according to KS F 3104. The measured results show that the paper sludge board using the melamine resin prepared according to the Examples in all cases has a much greater change in bending strength and wetting strength than the paper sludge board using the urea resins of Comparative Examples 3 to 5. It showed strong water resistance by showing a small absorption thickness expansion rate. In particular, even in the case of the paper sludge board manufactured according to Examples 1 to 3 having the same density and resin content, the water resistance which was remarkably superior to the paper sludge board using the urea resin of Comparative Examples 3 to 5 can be confirmed. there was.

The bending strengths of the paper sludge boards using the urea resins of Comparative Examples 3 to 5 and the melamine resins prepared according to Examples 1 to 12 were measured according to KS F 3104. The paper sludge board using the melamine resin prepared according to the examples in all cases showed greater bending strength than the paper sludge board using the urea resins of Comparative Examples 3 to 5. In addition, the paper sludge boards prepared according to Examples 1 to 3, which had the same density and resin content, also showed significantly superior bending strength as compared with the paper sludge boards using the urea resins of Comparative Examples 3 to 5. .

And the paper sludge board using the melamine resin which added and mixed the water-resistant agent manufactured according to Example 10-12 was used The paper sludge board manufactured according to Example 1 thru | or 3 with the same resin and density and resin content Compared to, the bending strength decreased slightly as the amount of water resistant agent was added, but the width was negligible and the properties related to water resistance were much better even when a small amount of water resistant agent was added.

As shown in the above results, when the paper sludge board according to the present invention is applied as a building interior material, not only the bending strength is superior to conventional gypsum board products, but also the properties of water resistance such as bending strength and absorption thickness and expansion rate when wet are remarkable. Excellent. And strong impact resistance could have the advantage of easy to handle during construction.

In addition, when compared to the conventional particle board products, the bending strength was weak, but the physical properties showing water resistance such as bending strength and absorption thickness expansion rate when wet were much better.

Therefore, the paper sludge board manufactured using melamine resin does not require strength like gypsum board products or particle board products. It is expected to be used as a board.

[effect]

As paper makers continue to expand their facilities, the amount of paper sludge, which is a waste generated in the papermaking process, continues to increase, and the processing costs are enormous.

In addition, the existing gypsum board and particle board products, which are interior materials for building, are poor in water resistance and no alternative product has been developed. In the case of the paper sludge board manufactured using the urea resin shown in the previous invention, It is true that water resistance is rather weak.

Therefore, in the present invention, by manufacturing a building waterproofing board using paper sludge and melamine resin and applying it as a building interior material that requires water resistance as a new building interior material with excellent water resistance and competitiveness compared to existing gypsum board and particle board products Developed.

As a result, the water-resistant board for building materials using melamine resin has remarkably superior physical properties than gypsum board or particle board products in water resistance and bending strength and absorption thickness expansion rate when wet. It is expected that the scope of application will be extended to this greatly demanded use.

In addition, the domestic board for building materials using paper sludge as the main raw material is manufactured by recycling the waste generated from the paper manufacturing process, which not only has a favorable price competitiveness than conventional gypsum board products, but also further reduces waste disposal costs. Has the advantage. In other words, by recycling paper sludge classified as specific industrial wastes as raw materials, the cost and additional processing cost of its treatment can be reduced, so that the cost sector can be more competitive than existing gypsum board and particle board products. have.

Claims (7)

Adding a water resistant agent to a liquid melamine resin or a powdered melamine resin aqueous solution having a solid content of 50 to 60% by weight of a hardening agent added to a sufficiently dehydrated, dried and pulverized paper sludge, followed by spraying and mixing; Prepressurizing the mixture into a plate using a prepress press; Molding by heating under pressure using a high pressure heat press; The manufacturing method of the waterproofing board for building materials containing a process. The method of claim 1, wherein the heat press molding 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 50 kgf / cm 2. The manufacturing method of the waterproofing board for building materials which is shape | molded so that it may fully discharge. The manufacturing method of the waterproofing board for building materials of Claim 1 whose density of the waterproofing board for building materials is 0.6-1.1 g / cm <3>. The production of a water-resistant board for building materials according to claim 1, comprising 77 to 87% by weight of the papermaking sludge, 10 to 20% by weight of the melamine resin, 0.01 to 0.5% by weight of the curing agent, and 0.2 to 2.0% by weight of the water resistant agent. Way. 2. The building material according to claim 1, wherein the papermaking sludge is sufficiently dried and pulverized within a water content of 2 to 5% by weight, a particle size of 0.5 mm, and contains 20 to 50% by weight of ash and 50 to 80% by weight of organic matter and wood fibers. Method of manufacturing a water resistant board. The method of claim 1, wherein the curing agent is selected from the group consisting of ammonium chloride, zinc chloride, acid anhydride, and mixtures thereof. The method of claim 1, wherein the water resistant agent is a paraffin wax.