KR101796263B1 - Molded Body of Cellulosic Materials and Preparation Method Thereof - Google Patents

Abstract

The present invention relates to a molded body of a cellulose-based material which does not contain a binder, wherein the molded body is prepared by subjecting a cellulose-based material and a binding agent to a heat press molding process. The binding agent causes an interfacial bonding reaction between cellulose molecules, and is characterized by including acid, peroxide, a metal catalyst, and non-reactive oil. Since the molded body of a cellulose-based material according to the present invention uses the above-mentioned binding agent, the molded body can be molded without using an adhesive in the process of molding the cellulose-based material such as forestry byproducts, agricultural byproducts, industrial waste, and municipal waste.

Description

{Molded Body of Cellulosic Materials and Preparation Method Thereof}

The present invention relates to a molded body of a cellulose-based material and a method for producing the same, and more particularly, to a method for producing a cellulose-based material by inducing a bond between cellulosic surfaces by substituting? -Glucose constituting cellulose with? -Glucose, And a method for producing the same. [0002]

Unlike starch or glycogen composed of? -Glucose, cellulose molecules constituting cellulose-based materials such as wood, pulp, rice husks and straw are mainly composed of? -Glucose, so each cellulosic molecule forms an intermolecular bond by hydrogen bonding do.

When various types of molded bodies are manufactured by molding wood, it is possible to produce products by carving the wood. However, in the case of producing a large quantity of wood molded articles such as MDF board, the powdered wood as described in Korean Patent Registration No. 10-0721898 And the mixture is mixed with an adhesive (resin) and pressure-molded. The adhesives used for the manufacture of wood are adhesives composed of urea, melanin, isocyanate, acrylic, epoxy and phenol resins containing formaldehyde, which can avoid environmental pollution and human toxicity due to the mixing of adhesives. There is a problem that it is very difficult to recycle the molded body manufactured by such a method.

In addition, Korean Patent Publication No. 10-0523176 discloses a cellulose resin composite molded article made from agricultural by-products such as rice husks, sawdust, and corn stems. In this case, however, since a binder such as a thermoplastic resin is used, The same problem is implied.

Therefore, there is an increasing demand for a method for producing a wood molded article by inducing bonding between cellulose molecules without using an adhesive.

For example, in Korean Patent Laid-Open Publication No. 10-2015-0050267, a compound having a first substituent derived from acetic acid, a second substituent derived from a fatty acid having 3 to 36 carbon atoms and a third substituent derived from an aromatic carboxylic acid having 7 to 20 carbon atoms Discloses a cellulose resin comprising at least one glucose unit ester-bonded to a cellulose hydroxy group. However, the prior art described above is a method for producing a resin by synthesizing a chemical substance such as cellulose acetate, and is far from a technology for forming a cellulose bond of a plant raw material such as wood, and induces a cellulose polymerization reaction rather than inducing a bond between cellulose Lt; / RTI >

On the other hand, the cellulose molecule can be treated with an acid catalyst or the like to induce a binding reaction between the reactive groups of glucose. However, such a technique can be achieved by adding zeolite as a solid acid catalyst to the pretreated cellulose as described in Korean Patent Publication No. 10-0887563, It is difficult to induce a reaction for forming a bond between cellulosic molecules. If a strong acid is used, the degradation reaction may take precedence over intermolecular bonding.

In the case of producing pellets by compressing wood waste powder as described in Korean Patent Publication No. 10-1007651, molding can be performed without using an adhesive. However, in the case where a molded product such as fuel pellets is not required to have strength and durability And is a method unsuitable for manufacturing molded bodies such as panels and boards.

As a result, in order to enhance the bonding force of the wood powder constituting the molded body, the bonding force is improved by optimizing the adhesive as in Korean Patent Registration No. 10-1281278. In the state where the use of the adhesive is extremely reduced, It is not possible to produce a wood-molded body.

Korean Registered Patent No. 10-1281278 Korean Patent Publication No. 10-0523176 Korean Patent Publication No. 10-0721898 Korean Patent Publication No. 10-2015-0050267 Korean Patent Publication No. 10-0887563 Korean Patent Publication No. 10-1007651

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems of the prior art, and it is an object of the present invention to provide a method of bonding a cellulose-based material such as agricultural by-products, agricultural by-products, industrial wastes, And a method for producing the cellulose-based material. The present invention also provides a method for producing the cellulose-based material.

It is another object of the present invention to provide a molded body of a cellulose-based material and a method for producing the same, which are manufactured by using a binding agent which enables the cellulose-based material to be used as it is in a crushed state by being bonded through interfacial bonding of cellulose without a drying process or a pulverization process. The purpose.

It is also an object of the present invention to provide a molded article having no toxicity due to an adhesive and having improved bonding force and cohesive force as compared with conventional molded articles such as MDF and plywood manufactured using an adhesive, and a method for producing the same.

In order to achieve the above object, the molded article of the present invention is a molded article of a cellulose-based material not containing a binder, the molded article being produced by hot pressing molding a cellulose-based material and a binding agent, Linking agent which causes an interfacial bonding reaction, characterized by comprising an acid, a peroxide, a metal catalyst and a non-reactive oil.

At this time, the binding agent may be a powder in which the acid, the peroxide, and the metal catalyst are absorbed by the porous material, the non-reactive oil is coated with the porous material, and the acid, peroxide, Or may be a capsule formed by collecting a material.

In addition, the method for producing the molded article of the cellulosic material of the present invention comprises the steps of: injecting the cellulosic material and the binding agent into a mold; Molding the mold by hot press molding to form a molded article; And cooling the molded body.

In this case, the method may further include a step of applying a releasing agent to the surface of the mold before the step of injecting the mold, or the step of applying an anti-reaction agent to the surface of the mold.

A Teflon coating layer or a ceramic coating layer may be formed on the surface of the mold.

Since the molded article of the cellulosic material according to the present invention uses a binding agent that operates by temperature and pressure to cause an interfacial bonding reaction between cellulose molecules, cellulose materials such as forestry by-products, agricultural by-products, industrial wastes and municipal wastes are molded It shows an effect that molding can be performed without using an adhesive in the process.

In addition, the cellulose-based material can be used as it is in a state of being shattered by adhesion through interfacial bonding of cellulose without a drying process or a pulverization process, so that the production efficiency can be improved.

In addition, compared with conventional molded articles such as MDF and plywood manufactured using an adhesive, a molded article having no toxicity due to an adhesive and having improved bonding force and cohesive force can be produced.

1 is a schematic view showing a mold structure for producing a molded article of the present invention.
2 is a schematic diagram showing an apparatus for producing a binding agent of the cellulose-based material of the present invention.
FIG. 3 is a conceptual diagram showing a process in which a binding reaction occurs when a binding agent of the cellulose-based material of the present invention is applied and press-formed.
4 is a schematic diagram showing a process of manufacturing a molded article of a cellulosic material using a hot press.
5 is a schematic diagram showing a process of producing a molded body of a cellulose-based material by a continuous process.
Fig. 6 is a photograph showing the state of (b) after heating the board (a) made of pulverized household articles and boiling water for 4 hours and heating the board.
7 is a photograph showing the state (a) of the water when the board of FIG. 5 is dipped in water for 4 hours and the state (b) of water after heating for 4 hours.
8 is a test report on the deformation rate and water absorption rate of a board made of pulverized household articles.
Fig. 9 is a photograph showing the results of testing water resistance of a board (b) of a crushed waste product molded using a commercially available MDF board (a) and a binding agent of the present invention.
FIG. 10 is a graph showing the results of the flexural maximum load test of the board manufactured from the crushed waste furniture of the present invention.

Hereinafter, the present invention will be described in more detail. The terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms and the inventor may appropriately define the concept of the term in order to best describe its invention It should be construed as meaning and concept consistent with the technical idea of the present invention.

The present invention relates to a binding agent which causes an interfacial bonding reaction between cellulose molecules, which can be applied to the production of a molded article using cellulose-based materials such as agricultural by-products, agricultural by-products, industrial wastes and municipal wastes.

Molded articles such as boards, panels, interior materials and furniture manufactured using cellulose-based materials such as wood can be used as ellipses including formaldehyde, melanin, isocyanate, acrylic, epoxy adhesives, phenol such as MDI (methyl diphenyl isocyanate) Adhesives such as adhesives, urethane adhesives, and the like must be used. Therefore, environmental impacts and human toxicity can not be avoided, and even when the formed molded product has reached the end of its useful life, there is a problem in that it is restricted in recycling. In contrast to this, the present invention enables the cellulose-based material to be bonded through the interfacial bonding reaction between the cellulose molecules without significantly reducing or using the adhesive in comparison with the prior art, so that a molded article can be manufactured from various cellulose-based materials .

The cellulose-based material in the present invention encompasses various materials made of cellulose, that is, various materials such as wood, tree roots, leaves, rice husks, straw, cornstalks, cornstalks, Or waste.

There are various cellulosic materials such as forestry by-products, agricultural by-products, industrial wastes and municipal wastes. These byproducts include waste by-products and waste such as thinning, tree roots generated at civil engineering sites, shells and debris generated in the processing of wood, broken wood products generated during logging, wood waste from construction sites, Wood waste such as pulp of waste furniture is representative, but it also includes agricultural byproducts such as rice husk, straw, weed, cornstalks, corn, and urban decayed waste.

Some of these cellulosic materials can be recycled by being used as a molding material after drying and pulverizing, but most of them are buried except for being sprayed with some soil modifier. In addition, since the amount of heat is insufficient, it can not be converted into fuel pellets, and when stored for a long period of time, there arises problems such as fire and corrosion, so it must be disposed of.

In the case of pulverized household articles, some of the good woody parts are separated and pulverized to be recycled as PF composite board. However, problems such as increased grinding cost, low manufacturing efficiency and environmental hazard of the adhesive are a problem. Especially, There is a problem that it is difficult to treat paints, chemical agents used in manufacturing furniture, contaminated dust, and fibers.

In addition, raw wood powder is insufficient to be used as fuel pellets due to a lack of heat, and it is required to undergo a drying process, thereby reducing cost competitiveness. In addition, since the corruption such as mold generation occurs during long-term storage and utilization is extremely low, it is incinerated or buried.

As a representative example of the cellulose-based material, the tree is formed by expanding in one direction through cell division in the hydroxy group of cellulose made of beta -glucose, and there is filled with a resin such as hemicellulose and wood sesame seeds.

Therefore, in order for these cellulose-based materials to react with each other, an interfacial bonding reaction between cellulose molecules should be performed so that they can mutually bind on the surfaces of powders or crushed pieces. A commonly used adhesive in this way forms a bonded structure by bonding the cellulose resin molecules and the adhesive resin at the interface.

However, bonding between cellulose molecules is not easy because cellulose molecules are highly chemically resistant and have a high dissociation energy for binding / decomposition. Therefore, when the temperature is raised, carbonization is generally performed through an oxidation reaction rather than a binding reaction. However, if energy is supplied to reach the proper level of reaction at the cellulose interface, it induces a transition state in which the reaction can take place at the cellulose interface, thereby causing an interfacial bonding reaction between the cellulose molecules and crosslinking of the β- it is considered that crosslinking through the substitution reaction of? -glucose with? -glucose can be formed. That is, supplying energy to activate the hydroxy group of the cellulose without carbonization at the interface is an important factor for inter-cellulose bonding.

The binding agent of the present invention is present in a stable state prior to use, and is formed to enter the molding process and generate energy when external heat and pressure are applied to induce an interfacial bonding reaction between cellulose.

The binding agent of the present invention for causing an interfacial bonding reaction between such cellulose molecules is characterized by containing an acid, a peroxide, a metal catalyst and a non-reactive oil.

That is, the reaction energy that can meet the reaction enthalpy between the cellulose molecules can be supplied using locally generated energy when the acid and the peroxide are mixed, but they are not mixed with each other before the reaction, To be generated.

Unlike the prior art, by using such a binding agent, a molded article can be produced without an adhesive. That is, in the present invention, a simple crushed product in which the material constituting the formed body is not subjected to pulverization or classification is used, and the binding agent is also easily kneaded as a solid phase powder only by being scattered in the mold. For this reason, a molded body can be manufactured simply by hot press molding, which has the advantage of simplifying the design of the mold.

However, molds depend on the size of the material, the nature of the material to be used (moisture content, content of pollutants, etc.), and the structure of the product to be produced. Particularly, a difficult problem in production is that the reactivity of the binding agent of the present invention is very good, so that it also acts on the surface of the mold, so that the woody material and the metal surface of the mold are strongly bonded. This can make it very difficult to attach and detach from the mold after the production is finished and delay the production time.

Therefore, as shown in Fig. 1, the mold for producing a molded article according to the present invention can be obtained by applying a releasing agent to the inner surface of a mold, particularly to inner surfaces of upper and lower molds, applying a powder or film containing no reagent, It needs to be formed.

Examples of such release agents include oils such as silicone oil, oil stain and soybean oil, and powders not containing a reactant, such as talc powder, calcium carbonate powder, feldspar powder, wood flour, wheat flour, starch powder, Paper (wet paper) and the like.

In addition, Teflon coating or ceramic coating should be applied to the top and bottom surfaces of the mold, or a sheet made of Teflon should be used. In addition, the mold must have a gas vent of 0.5 to 2 mm in diameter. Since the cellulose-based material used in the present invention can be used as it is without drying, a large amount of gas including moisture can be generated during high-temperature compression and it must be discharged through a gas vent. Generally, in the case of a molded product manufactured using wood powder, the wood powder itself is pulverized and dried, so there is a problem that moisture is not generated but the process is complicated and the production cost is increased. However, in the present invention, In order to take advantage of these advantages, it is necessary to optimize the installation of the gas vent to the mold for manufacturing the molded body.

Further, in order to reduce the heat (energy cost) applied from the hot press, it is preferable to use a mold having a thickness of 10 mm or less on the left and right sides.

In addition, by attaching a lightweight insulator around the edge of the mold, the production time (pressurization heating time) can be shortened and energy can be saved.

Further, since cooling is performed in an external device of the hot press apparatus, it is preferable to use two sets alternately in order to increase the production speed.

In addition, since the pressurization is performed only in the upward and downward directions, when a board-shaped molded article is manufactured, a plurality of boards can be stacked at the same time, and in this case, a release agent may be inserted between the respective layers.

Further, in the case of a board having a low specific gravity or a heat insulating material made of straw, the mold may be made of wood.

The binding agent used in the production of the molded article of the present invention includes an acid and a non-reactive oil.

In the present invention, since the nonreactive oil reacts with an acid to cause an oxidation reaction and is cured, it forms a kind of protective film that stably protects the acid until it is put into a molding process. Examples of such non-reactive oils include sodium lignin, calcium lignin, mineral oil, paraffin oil, oil stain (prepared by mixing soybean oil with paraffin wax at a temperature of 200 ° C or more for 5 minutes or more and cooling to 60 ° C) (Particularly, diphenylsiloxane-based silicone oil), it is preferable to use any one or a mixture of two or more thereof.

As the acid, an acid having a pH of 3 or less, preferably pH 1 or less is used, and any one or a mixture of two or more selected from nitric acid, sulfuric acid, sulfuric acid, phosphoric acid and hydrochloric acid can be used.

The peroxide is a component used to improve the reaction rate at high temperature and high pressure molding conditions when a reaction occurs at the interface of cellulose. As the peroxide, any one or a mixture of two or more selected from peroxide ester, benzoyl peroxide, diacyl peroxide, hydroperoxide, endoperoxide and hydrogen peroxide may be used.

In addition, the metal catalyst is a component added for promoting the reaction, and it is preferably one or more of metal salt, metal oxide, alloy, and metal powder. Concretely, it is possible to use metal oxides such as lithium, sodium, potassium, rubidium, cesium, magnesium, calcium, strontium, barium, titanium, zinc, cadmium and mercury, magnesium-aluminum alloy, zinc, sodium silicate, calcium silicate, .

Since the above components are contained in the binding agent and generate energy while reacting due to heat and pressure generated in the molding process of the molded article, they must be contained in a stable state before use.

In one embodiment, the binding agent is a powder in which the acid, peroxide, and metal catalyst are absorbed by the porous material, and the non-reactive oil is coated with the porous material.

The porous material absorbs the components constituting the binding agent and emits the absorbed components by heat and pressure generated during the molding process to operate as a binding agent.

In the present invention, the porous material should have a water absorption rate of 20 wt% or more. That is, at least 20% by weight or more of the components other than the porous material should be adsorbed to the total weight of the powder. If the adsorption amount is less than 20% by weight, the binding agent does not sufficiently generate energy, thereby failing to sufficiently induce the cellulose interface bonding and causing defects.

Considering the water absorption rate of the porous material, the acid is used in an amount of 5 to 20 parts by weight, the peroxide is used in an amount of 0.1 to 3 parts by weight, the metal catalyst is used in an amount of 0.1 to 3 parts by weight, and the non-reactive oil is used in an amount of 3 to 10 parts by weight.

In addition, the porous material may be adsorbed in the porous material, and then coated with the non-reactive oil in an amount of 10 to 45 parts by weight to prevent the adsorbed material from being eluted.

Accordingly, the binding agent may be prepared by mixing an acid, a peroxide, a metal catalyst, and a non-reactive oil; Absorbing the mixture into a porous material; And coating the absorbed porous material with a non-reactive oil.

Acids, peroxides, metal catalysts, and non-reactive oils can be mixed using a super mixer to enable mixing of high viscosity raw materials.

In another embodiment, the binding agent is a capsule formed by capturing the acid, peroxide, metal catalyst, and non-reactive oil with a wall material.

At this time, the material constituting the wall material may be any one or more of high density polyethylene, low density polyethylene, linear low density polyethylene, ethylene ethyl acetate, polypropylene, ethylene vinyl acetate, ethylene wax and paraffin wax.

The bonding agent does not require a base material for absorption such as a porous material, and the process is simplified because the base material is encapsulated by grafting polymerization of a mixed acid, a peroxide, a metal catalyst, and a non-reactive oil with a polymer at a low temperature.

Such binding agents include the steps of mixing an acid, a peroxide, a metal catalyst and a non-reactive oil; And collecting and encapsulating the mixture with a wall material.

In this case, the content of each component is used in a ratio of 5 to 20 parts by weight of acid, 0.1 to 3 parts by weight of peroxide, 0.1 to 3 parts by weight of metal catalyst and 1 to 3 parts by weight of non-reactive oil, And 10 to 45% by weight of the polymer are mixed with each other to prepare a capsule.

The powder form and the capsule form are employed for the purpose of preventing the reaction between an acid, a peroxide and a metal catalyst in order to prevent the acid or peroxide constituting the binding agent from coming into contact with air or moisture. This is to ensure that the components are released when the heat and pressure are applied in the molding machine for the formation of the cellulose powder in the stable state so as to cause the cellulose interface bonding reaction.

The process for preparing the binding agent of the present invention will be described with reference to FIG.

First, an acid, a peroxide, a metal catalyst, a non-reactive oil and, if necessary, a porous material and a carrier are supplied from respective reservoirs, and are mixed while being mixed using a supermixer. The carrier uses lignin or an olefinic linear monomer that constitutes the wood together with cellulose and hemicellulose, which acts as a solvent for dispersing each constituent of the binding agent. In addition, it plays a role of promoting the bonding reaction between cellulose in the molding process.

When a porous material is used to adsorb the acid, the peroxide, the metal catalyst, the non-reactive oil, and the carrier, since it is stabilized at this stage, it is coated with the non-reactive oil and then discharged immediately.

If a porous material is not used, additional additives, pigments, and the like are added as necessary after metering, mixed with a mixer, mixed and dispersed, and then encapsulated with a wall material. At this time, a secondary crosslinking agent may be added depending on the function.

The capsules thus prepared are dried in a silo and pulverized in a state of ultra-low temperature with liquid nitrogen to prepare capsules of micrometer unit. It is classified, packaged and inspected to release the capsule product.

The above-prepared binding agent is formed at a high temperature and a high pressure by varying the mixing amount depending on the type, size, state, and strength of the material for forming the cellulosic powder.

The process in which such a coupling agent causes a bonding reaction at the cellulose interface occurs at a temperature of 160 DEG C or higher and a pressure of 30 kgf / cm < 2 > or more, that is, a hot press forming condition. As shown in FIG. 3, when the binding agent is released, the reaction entropy is increased to activate the cellulosic interface, and the cellulose terminal group is substituted by? To? Or activated. At the same time, the lignin chain, which is a carrier, is disassembled and converted into a linear structure. In this process, a graft polymerization reaction occurs between the cellulose interface and the cellulose interface and the lignin interface. Whereby the interface of each of the cellulosic materials is bonded.

In addition, self-crosslinking occurs during the cooling stabilization process after completion of the press forming process, so that the interfacial adhesion of the cellulosic material is further strengthened.

Therefore, the binding agent of the present invention causes binding between the cellulose interface only under high temperature and high pressure conditions.

As a result of the experiment, it was found that when a 3 wt% binding agent was introduced to the total weight of the formed body, and a piece of waste wood mixed with various sized pieces having a diameter of 5 to 250 mm was used as a raw material and molded at a pressure of 35 kgf / The molded body exhibited a flexural strength of 15 N / mm < 2 >. It was also found that when the same amount of bonding agent was introduced and molded at a pressure of 90 kgf / cm 2, the resulting molded body had a flexural strength of 30 N / mm 2 or more.

In addition, when the introduction amount of the binding agent is increased to 10 wt%, the bending strength of 30 N / mm < 2 > or more can be obtained even when molding is performed at a relatively low pressure of 60 kgf / cm 2. However, from the commercial point of view, it is necessary to optimize the amount of the binding agent and the molding conditions in consideration of these factors, because the amount of the binding agent is small and the pressure of the press is high.

In addition, the bonding strength of the cellulose interface was determined by the content of acid upon introduction of the binding agent.

That is, when the acid content of the binding agent introduced on the basis of the molded article was 2% by weight, the peel strength of the obtained molded article was found to be about 10 kgf / cm 2 when molded at a pressure of 35 kgf / 20 kgf / cm 2, about 30 kgf / cm 2 for 8 wt%, and about 40 kgf / cm 2 for 15 wt%, indicating that the content of acid was a factor in determining the degree of interfacial reaction between cellulose.

As a result of experiments on the relationship between the amount of peroxide and metal catalyst introduced and the strength of peeling (peel strength), it was found that there was no significant difference in the peel strength depending on the amount of introduction, but the amount of introduction of peroxide and metal catalyst did not directly affect the bonding strength Respectively.

Therefore, from the experimental results, a process condition was determined that the pressure range of the press-forming apparatus should be 20 to 160 kgf / cm 2, preferably 30 to 160 kgf / cm 2 in the molding process.

It was also confirmed that the maximum bending strength and the bending strength of the molded article were determined by the following variables in addition to the introduction amount of the binding agent of the present invention and the pressure at the time of molding.

(1) The larger the size of the cellulosic material, that is, the size of the crushed product, the higher the maximum bending strength and the bending strength.

(2) When the cellulosic material has a large size and a high porosity, when the cellulose material is mixed with a small-sized cellulose-based material, the maximum flexural strength and bending strength are increased.

(3) Regardless of the size of the cellulose-based material, the flexural strength is increased when the coupling agent is used in a state where the cooling agent is stabilized.

④ When two boards with different particle sizes are bonded using a bonding agent, a higher bending strength than the sum of the bending strengths of the two boards is obtained.

(5) When two boards made of particles of the same size are bonded to each other at different pressing directions, that is, when they are joined in a moment of opposite direction, the bending strength is increased.

⑥ If you mix minerals with high hardness and binding agent regardless of the size of the cellulose material, the flexural strength increases further.

In addition, the self-crosslinking reaction takes place at the cellulose interface during the cooling process after the press molding, thereby increasing the structural stability. Stability has been shown to increase when cooled below 100 ° C in the cooling process.

Cooling is preferably carried out by natural cooling after precisely adjusting the thickness of the molded body by demolding from the mold. In addition, if it is desired to cool down within one minute, or if it is desired to reduce the cooling time, it may be cooled through a cooling plate equipped with a pipe through which cooling water can be circulated.

That is, as shown in Fig. 4, a molded article can be produced by a hot pressing step, or a molded article can be produced by a continuous process as shown in Fig.

3 is a perspective view illustrating a method of manufacturing a board according to an embodiment of the present invention. FIG. 3 is a perspective view illustrating a method of manufacturing a board according to an embodiment of the present invention. , Preheated and compressed at a temperature of 120 to 150 ° C for 100 to 150 seconds to pressurize to a thickness of 20 to 30% (Step 2). Thereafter, the compression is loosened to loosen the thickness and pressurize at a temperature of 160 to 180 ° C for 30 to 100 seconds (Step 3) so that the thickness is equal to the thickness of the desired board. Next, the molded board is transferred to a cooling plate, and quenched for 100 seconds or less for 60 to 100 seconds (step 4). Even when quenching, a pressure of 50 to 150 kgf / cm 2 is applied using an air jig (step 5). Finally, the cooled board is drained down to complete the product (step 6).

The effect of the binding agent of the present invention was verified by evaluating the characteristics of the molded article of the cellulosic material to which the binding agent of the present invention was applied. That is, as described above, sidewall blocks, flooring materials, and wood bricks were manufactured using the crushed products of the waste furniture, and their physical properties were tested.

The collected waste furniture materials are contaminated with various chemical agents used for original furniture production (such as waxes for varnish, varnishes, coloring paints, functional chemicals for waterproofing and insect repellent), or the use of furniture It is also exposed during storage, storage and loading, and is severely contaminated. That is, it contains a large amount of toxic or environmentally harmful ingredients.

The most important condition for utilizing this is to prevent toxic and pollutants contained in raw materials from being released to the outside when they are made into products. That is, it means that decomposition or elution should not occur in a rainfall situation, a wet condition, or an ultraviolet ray exposure situation by solar irradiation. In short, the molded body should have all of the chemical resistance, chemical resistance and water-repellency function.

FIG. 6 shows the result of testing whether or not toxic substances are eluted from a board formed by applying the binding agent of the present invention to pulverized household articles. 6 (a)), and the board was placed in boiling water for 4 hours and heated (FIG. 6 (b)). After the board was placed in boiling water for 4 hours, No swelling or breaking phenomenon was observed at all.

6 is a photograph showing the state of the water (Fig. 7 (a)) when the board is dipped in water for 4 hours and the state of water (Fig. 7 (b)) after heating for 4 hours. The photograph shows that the color of the water after heating for 4 hours hardly changes, so that there is no component eluted from the board.

Therefore, the board manufactured by applying the binding agent of the present invention stably maintains its structure even under hydrothermal conditions and does not elute components contained in raw materials such as toxic components.

In addition, the strain and moisture absorption rate of the board were measured. For the measurement, a 50 × 50 × 50 mm cut board was used as the test specimen. The test method was U-type immersion for 2 hours in normal temperature water (17 ° C.) , And the water absorption rate and water absorption rate were measured after immersing in water at 100 ° C for 2 hours as a P-type. As a result, as shown in the test report of FIG. 8, the water content was 0.6% and the water absorption rate was very low.

Further, in order to confirm the characteristics of the board manufactured using the binding agent of the present invention as compared with a commercially available MDF board, two boards were immersed in water at 100 ° C for 2 hours and then an experiment was performed.

As a result, as shown in FIG. 9, it was confirmed that both boards had the same shape before the experiment, but the MDF board collapsed like mud after immersing in water at 100 ° C, and thus the shape of the board could not be maintained.

Seven specimens were prepared to measure the flexural strength according to the amount of the binding agent of the present invention. Sample 1 was prepared by using fine wood powder having a particle size of 1 mm or less used in general synthetic wood as a raw material and 20 wt% of a binding agent. Specimens 2 to 6 fixed the introduction amount of the binding agent to 10 wt% Sawdust with a size of 1 ~ 2mm and rough wood roots with a size of 5 ~ 100mm were prepared as raw materials. In addition, the test piece 7 was prepared by mixing 10 wt% of the binding agent and roughly sawdust of a maximum size of 3 mm and a bark of a maximum size of 50 mm.

Table 1 shows the results of measuring the flexural strength of each sample.

Psalter Length × width × thickness (mm) Average bending strength (N / mm2) One 200 x 50 x 10.5 35 2 200 x 50 x 10.9 32 3 200 x 50 x 10.9 38 4 200 x 50 x 11.0 38 5 200 x 50 x 10.8 42 6 200 x 50 x 10.8 45 7 200 x 50 x 9.5 40

Since the binding agent of the present invention causes a binding reaction through reaction at the cellulose interface which is the contact surface of wood, the larger the size of the raw material, the more the bending strength is increased. In specimen 1 with small grain size, the flexural strength was not increased even though the coupling agent was introduced twice.

Sample 7 showed large differences in the size of the mixed materials, and it was found that the difference in size affects the moment and deflection of cellulose. That is, when the materials having different moments are mixed, the bending strength tends to be higher than the individual bending strength. In addition, even when the amount of the coupling agent introduced was between 2 and 30 wt%, almost the same mechanical properties were obtained.

This is because most of the processes that use adhesives or binds (primarily oily / aqueous, environmentally friendly, toxic, non-toxic) as primary binders in the manufacture of conventional synthetic wood (under the same pressure process) Which is a completely different result from the increase in the flexural strength, suggests a mechanism different from the mechanism in which the inter-cellulose bonding mechanism of the present invention is bonded using an adhesive.

In addition, a flexural maximum load test was performed according to the amount of the binding agent of the present invention. For comparison, wood flour of 1 mm or less, which is used as a commercially available synthetic wood material, was used. The results are shown in Fig.

As can be seen from the results of FIG. 10, as the amount of the binding agent introduced increases, the reaction ratio per mole at the cellulose interface increases, which is increased in proportion to the flexural load. In other words, the binding agent affects the binding force until all of the interfacial surfaces between the cellulose surfaces are covered with each other, but the residual agent that does not react unnecessarily beyond the interfacial reaction interferes with the binding, causing the carbonization, Is expected to decrease.

Therefore, the binding agent of the present invention has a maximum introduction amount to the extent that the surface reaction occurs, which is correlated with the surface area of the material, that is, the size of the material. For example, in the materials used in the present invention, the maximum amount of pulverized household articles having an average diameter of 5 cm was 20% by weight, and the amount of the pulverized articles was 3 to 8% by weight depending on the application.

Accordingly, the molded article produced by the hot press molding of the cellulosic material using the binding agent of the present invention is an excellent performance mold exhibiting the effects of durability, chemical resistance, chemical resistance and water repellency unlike the case of using an adhesive It is understood that this is due to the use of the binding agent of the present invention to cause binding at the cellulose interface.

Therefore, the molded body manufactured using the binding agent of the present invention should be manufactured using a mold in which a coating layer is formed on the inner surface and a gas vent is formed as disclosed in the present invention.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments and that various changes and modifications may be made therein without departing from the spirit and scope of the invention. Change is possible. Such variations and modifications are to be considered as falling within the scope of the invention and the appended claims.

Claims (7)

A molded article of a cellulosic material not containing a binder,
The molded article is manufactured by subjecting a cellulose-based material and a binding agent to heat press molding,
The binding agent is a binding agent that causes an interfacial bonding reaction between cellulose molecules, and includes an acid, a peroxide, a metal catalyst, and a non-reactive oil
Wherein the nonreactive oil reacts with the acid to cause an oxidation reaction and cures to stably protect the acid until the molding process is started.
delete delete A method for producing a molded article of a cellulosic material according to claim 1,
Introducing a cellulose-based material and a binding agent into a mold;
Molding the mold by hot press molding to form a molded article;
Cooling the formed body;
Based material. ≪ RTI ID = 0.0 > 11. < / RTI >
The method of claim 4,
And applying a releasing agent to the surface of the mold before the step of injecting the mold into the mold.
The method of claim 4,
And applying a reaction inhibitor to the surface of the mold before the step of injecting the mold into the mold.
The method of claim 4,
Wherein a Teflon coating layer or a ceramic coating layer is formed on the surface of the mold.

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