WO2013129847A1

WO2013129847A1 - Chemical-free synthetic wood using reed and method for manufacturing same

Info

Publication number: WO2013129847A1
Application number: PCT/KR2013/001598
Authority: WO
Inventors: 백철기
Original assignee: 주식회사 우드원
Priority date: 2012-02-27
Filing date: 2013-02-27
Publication date: 2013-09-06
Also published as: CN104136180B; CN104136180A; KR101214074B1

Abstract

The present invention relates to chemical-free synthetic wood using reed and to a method for manufacturing same. The method for manufacturing chemical-free synthetic wood using reed comprises: (a) a step of removing formaldehyde from wood flour and pulverized reed; (b) a step of adding dye to the wood flour and pulverized reed from which formaldehyde is removed; (c) a step of drying the dyed wood flour and pulverized reed; (d) a step of mixing synthetic resin and the dried wood flour and pulverized reed to prepare a preliminary synthetic wood composition; (e) a step of adding one or more selected from the group consisting of a processing aid, a UV absorber, a mineral filler and a colorant to the preliminary synthetic wood composition to prepare a synthetic wood composition; and (f) a step of extrusion molding the wood composition. According to the present invention, chemical-free synthetic wood using reed which is eco-friendly and exhibits the texture of natural wood can be manufactured.

Description

[Revision 16.05.2013 under Rule 26] (해) Pollution-free reed synthetic wood and its manufacturing method

The present invention relates to a pollution-free reed synthetic wood and a method of manufacturing the same, and more particularly, by mixing and extruding a mixture of dyes, processing aids, UV absorbers, mineral fillers and colorants in wood powder and pulverized reeds removed formaldehyde, And it relates to a method for producing a pollution-free reed synthetic wood that can exhibit the texture of natural wood.

Natural wood is a wood material necessary to produce architecture, furniture, boards, pulp and paper. It is environmentally friendly, easy to process, and has the effect of improving the aesthetics through the texture of natural wood. Mainly used. However, the natural wood is not only easy to deform the water resistance or antibacterial, but also used as a building material, because the maintenance work is required continuously, the economic loss is also large, the problem that the forest is damaged by the felling of trees.

In order to solve the above problems, research on synthetic wood having a texture and appearance similar to natural wood is being actively conducted.

The synthetic wood is a material having a similar appearance or properties to natural wood by mixing finely ground wood powder and synthetic resin, and manufactured by injection or extrusion molding, and compared with natural wood, mechanical strength, water resistance, heat resistance and The antimicrobial activity is improved and the price is low, thereby reducing the manufacturing cost.

On the other hand, Korean Patent Publication No. 10-1000337 as a technique for producing a synthetic wood, after mixing and drying palm tree bark powder and aluminum hydroxide, and the natural mixture, a thermoplastic resin, a sunscreen and a pigment in the dried mixture Mixing and putting the mixture into a mold to provide a method for producing artificial composite wood comprising the step of forming a work by applying heat of 110 ~ 230 ℃. However, the method does not include the step of removing formaldehyde, and when used as a building material, formaldehyde may be released from the building material, which may have a harmful effect on the human body. The texture of the wood does not appear properly.

An object of the present invention is to solve the problems as described above, to provide a method for producing a pollution-free reed synthetic wood that can minimize the environmentally friendly and harmful substances by removing formaldehyde.

In addition, the present invention provides a method for producing a pollution-free reed synthetic wood that can exhibit the texture of natural wood by dyeing the wood powder and crushed reed particles themselves.

In order to achieve the above object, the pollution-free reed synthetic wood according to the present invention and a method for preparing the same are (a) removing formaldehyde from wood powder and pulverized reed, and (b) dyes of wood powder and pulverized reed from which the formaldehyde is removed. Dyeing by adding (c) drying the dyed wood powder and pulverized reed, (d) mixing a synthetic resin with the dried wood flour and pulverized reed to form a pre-synthetic wood composition, (e) Adding to the pre-synthetic wood composition any one or more selected from the group consisting of processing aids, UV absorbers, mineral fillers and colorants to form a synthetic wood composition; and (f) extruding the synthetic wood composition. Provided is a method for producing a pollution-free reed synthetic wood.

In addition, according to the pollution-free reed synthetic wood according to the present invention and a method for producing the same, the step (a) is characterized in that it is carried out at 50 ℃ to 80 ℃.

In addition, according to the pollution-free reed synthetic wood according to the present invention and a method for producing the same, the step (b) is characterized in that it is carried out at 30 ℃ to 60 ℃.

In addition, according to the present invention, the pollution-free reed synthetic wood and its manufacturing method, the wood powder is 30% to 40% by weight relative to the total weight of the synthetic wood composition, the crushed reed is 20% by weight relative to the total weight of the synthetic wood composition To 30% by weight, the synthetic resin is 5% to 10% by weight relative to the total weight of the synthetic wood composition, the processing aids, UV absorbers and mineral fillers are 5% to 15% by weight relative to the total weight of the synthetic wood composition and the coloring agent It is characterized in that 20 to 30% by weight relative to the total weight of the synthetic wood composition.

In addition, according to the eco-friendly reed synthetic wood and its manufacturing method according to the present invention, the step (c) is characterized in that the moisture content of wood flour and crushed reeds are dried to 5% to 15%.

In addition, according to the present invention, the pollution-free reed synthetic wood and its manufacturing method, the processing aid in the step (e) is characterized in that any one or more selected from the group consisting of binders, lubricants, antioxidants, flame retardants and heat stabilizers. .

In addition, according to the present invention, a pollution-free reed synthetic wood and a method for manufacturing the same, (a) removing formaldehyde from wood flour and pulverized reed, (b) adding dye to the wood powder and pulverized reed from which the formaldehyde is removed Dyeing, (c) drying the dyed wood flour and pulverized reed, (d) mixing synthetic resin with the dried wood flour and pulverized reed to form a pre-synthetic wood composition, (e) the preliminary Adding to the synthetic wood composition any one or more selected from the group consisting of processing aids, UV absorbers, mineral fillers and colorants to form a synthetic wood composition, (f) adding coffee powder to the synthetic wood composition, and (g ) Provides a method for producing a pollution-free reed synthetic wood comprising the step of extruding the synthetic wood composition to which the coffee powder is added.

In addition, according to the present invention, the pollution-free reed synthetic wood and its manufacturing method, the wood powder is 30% to 40% by weight relative to the total weight of the synthetic wood composition, the crushed reed is 20% by weight relative to the total weight of the synthetic wood composition To 30% by weight, the synthetic resin is 5 to 10% by weight relative to the total weight of the synthetic wood composition, the processing aid, UV absorber and mineral filler is 5 to 15% by weight relative to the total weight of the synthetic wood composition, the colorant 15 to 25% by weight relative to the total weight of the synthetic wood composition and the coffee powder is characterized in that 5 to 10% by weight relative to the total weight of the synthetic wood composition.

As described above, according to the pollution-free reed synthetic wood according to the present invention, by mixing and extruding a mixture of dyes, processing aids, UV absorbers, mineral fillers and colorants in the wood powder and crushed reeds to remove formaldehyde, The effect of expressing texture is obtained.

In addition, according to the pollution-free reed synthetic wood according to the present invention, by removing the formaldehyde before mixing the pre-synthetic wood composition is also obtained the effect of minimizing environmentally friendly and harmful to the human body.

In addition, according to the non-pollution reed synthetic wood according to the present invention, by adding a dye to the wood powder and pulverized reed particles themselves can be dyed by showing the color and texture of natural wood without a separate surface treatment and durability The effect of producing this strong synthetic wood is also obtained.

In addition, according to the pollution-free reed synthetic wood according to the present invention, by using the reed is excellent in elasticity and durability, the effect that can be used not only for building exterior materials but also for interior interior materials.

In addition, according to the pollution-free reed synthetic wood according to the present invention, by using the reed can satisfy the wood fibers that can be lacking in the wood powder, the synthetic wood light weight about 25 to 30% compared to the weight of the general synthetic wood The effect which can be manufactured is also acquired.

In addition, according to the pollution-free reed synthetic wood according to the present invention, by using the coffee powder, the color of the coffee powder is colored on the surface of the synthetic wood to exhibit a natural natural coffee color and texture rather than an artificial coffee color by the pigment and coffee The effect of expressing a subtle fragrance is also obtained.

1 is a flow chart illustrating a method for manufacturing a pollution-free reed synthetic wood according to an embodiment of the present invention.

Figure 2 is a flow chart for explaining a method for producing a pollution-free reed synthetic wood according to another embodiment of the present invention.

The above and other objects and novel features of the present invention will become more apparent from the description of the specification and the accompanying drawings.

Hereinafter, with reference to Figure 1 will be described in detail a method for producing a pollution-free reed synthetic wood according to an embodiment of the present invention.

Referring to Figure 1, the method for producing a pollution-free reed synthetic wood according to an embodiment of the present invention includes the step of removing formaldehyde from wood flour and crushed reed (S1).

The formaldehyde (Formaldehyde) is a colorless gas having a very strong irritant occurs in formalin, plywood and chemical production. In particular, it is considered to be a harmful substance that has a harmful effect on indoor air pollution and human body, because it is included in the insulation materials and adhesives of indoor furniture, which are frequently used in buildings. Prolonged exposure to formaldehyde causes eye, nose, neck and skin irritation, respiratory distress, respiratory failure, atopic dermatitis and other skin and cancer diseases.

Since the formaldehyde is highly volatile, wood powder and pulverized reed are put in a container and removed by heating it. The step (S1) is preferably performed at a temperature of 50 ° C to 80 ° C, but is not limited thereto. In the step S1, the filter and the humidity controller may be used to keep the humidity of the air flowing into the container at 3% to 10%.

If the heating temperature is 50 ℃ or less, the molecular motion of the formaldehyde is not active is not sufficiently volatilized, if the heating temperature is more than 80 ℃ may cause a problem that the formaldehyde is not properly removed.

The step (S1) may be performed before producing the synthetic wood to minimize the harmful substances to reduce indoor air pollution and to produce a synthetic wood composition harmless to the human body.

After performing the step (S1), the dye is added to the wood powder and pulverized reed remove the formaldehyde (S2).

The dye is used to dye the material, can be dissolved in water and organic solvents, dispersed as a single molecule and combined with the molecules of the material to color the inside of the material. The dye may represent the color of the synthetic wood by mixing the red, yellow and black dyes in an appropriate ratio as necessary. The red-based dyes may be used, such as marshmallow, safflower, ginger, firewood, joiner, lump, birch, brown oak, camellia, grape, brown stone and ocher, and as the yellow dye, gardenia, old tree, painting tree, Onion, yellow wall, barberry, cloves, plum, turmeric, alder, paulownia. chestnut. Oak and pine trees may be used, and as the black dye, old wood, plum, pomegranate, cassia, yew, red wood, lotus shell, gall bladder, dermis, oak, pomegranate, prunus oak, maple and basalt can be used. But it is not limited thereto.

The step (S2) is preferably performed at 30 ° C to 60 ° C using an infrared ray lamp. If the temperature is 30 ℃ or less, the dye is not completely colored in the wood powder and crushed reeds to obtain a vivid color, if the temperature is 60 ℃ or more the viscosity of the dye is lowered may cause the color of the synthetic wood quickly discolored have.

The step (S2) is carried out before the preparation of the pre-synthetic wood composition to directly dye the wood powder and crushed reeds, so that the color of the synthetic wood can be vividly expressed and does not discolor even after long use. In addition, when manufacturing the synthetic wood surface is beautifully expressed can exhibit the color and texture of natural wood without a separate coating treatment. In addition, the infrared ray penetrates into the wood powder and the crushed reed particles by using an infrared light lamp to promote the reaction with the dye, so that the dye may be dispersed properly and the color of the synthetic wood may appear clearly.

After performing the step (S2), the dyed wood flour and crushed reeds are dried (S3).

The step (S3) is preferably dried so that the moisture content of wood flour and crushed reeds is 5% to 15%. When the moisture content is less than 5%, the moisture contained in the wood flour and crushed reeds is excessively drained, so that the volume may be reduced and constricted. If the moisture content is 15% or more, the moisture content of the wood flour and crushed reeds is increased. Synthetic wood may decay or deteriorate durability.

The step (S3) not only controls the moisture content of the wood flour and crushed reeds, but also the dye penetrates deeply into the particles of the wood flour and crushed reeds to prevent the color of the synthetic wood from appearing vividly and discoloring and discoloring. .

After performing the step (S3), to form a pre-synthetic wood composition by mixing a synthetic resin in the dry wood powder and crushed reed (S4).

The wood powder may be any one or more selected from the group consisting of coniferous trees such as pine, fir, pine, and hardwoods such as zelkova, maple, persimmon, chestnut, and cherry, as crushed wood finely, but not limited thereto. The wood powder may be used by grinding the particle size of the wood to the size of 50 Mesh to 120 Mesh.

The reeds contain chitin components that form the cell walls of plants and are excellent in elasticity, elasticity and water resistance, and are suitable as a material for interior materials. The reed can be used by adjusting the size of the particle according to the use, preferably 40 mesh to 180 mesh (the size of particles that can pass through a sieve having 180 scales in 1 square inch) It is not limited. If the particle size is 40 Mesh or less, the particle size is large, and thus the fiber contained in the reed and synthetic resin do not bond properly, so that the uniformity of density is lowered. If the particle size is 180 Mesh or less, the synthetic resin is contained in the reed. It may not be filled into the pores of the poor mixing can cause a problem that the strength of the synthetic wood is reduced.

The synthetic resin may be any one or more selected from the group consisting of polypropylene, polyethylene, and polystyrene having good processability, but is not limited thereto.

In the step (S4), it is preferable to put the wood powder, the crushed reeds and the synthetic resin into a blender at a temperature of 70 ℃ to 80 ℃. By combining the wood powder, pulverized reeds and synthetic resin is stronger bond strength when producing synthetic wood has the effect that can be used for a long time without deformation because the impact strength, tensile strength, elasticity and water resistance of the synthetic wood is improved.

In the step (S4), the wood powder is preferably 30% to 40% by weight relative to the total weight of the synthetic wood composition, the crushed reed is 20% to 30% by weight relative to the total weight of the synthetic wood composition. Preferably, the synthetic resin is preferably 5 to 10% by weight relative to the total weight of the synthetic wood composition.

If the wood powder is less than 30% by weight relative to the total weight of the synthetic wood composition, the texture of the wood is lowered, if more than 40% by weight, the screw (extruder) of the extruder during the extrusion molding during the synthetic wood manufacturing process may cause a problem of wear Can be.

If the pulverized reed is less than 20% by weight relative to the total weight of the synthetic wood composition, the elasticity and durability of the synthetic wood may decrease.

When the synthetic resin is less than 5% by weight relative to the total weight of the synthetic wood composition, the bonding strength between the wood powder and the crushed reed particles is lowered, and the strength of the synthetic wood is lowered. When the synthetic resin is more than 10% by weight, the texture of the wood may be deteriorated. Can be.

After performing the step (S4), at least one selected from the group consisting of processing aids, UV absorbers, mineral fillers and colorants to the pre-synthetic wood composition to form a synthetic wood composition (S5).

The processing aid is not limited to any one or more selected from the group consisting of a binder, a lubricant, an antioxidant, a flame retardant, and a heat stabilizer as an additive capable of improving the processability and physical properties by adding a small amount in the production of synthetic wood.

The binder is a material used to improve the bonding strength between wood flour and crushed reeds and synthetic resin, and serves to increase the strength of the synthetic wood by giving elasticity and adhesion. The binder may be a material in which polypropylene and polyethylene and maleic anhydride are chemically bonded, but is not limited thereto.

The lubricant is used to improve the fluidity of the polymer when heat-molding to facilitate processing, and serves to improve the surface properties of the synthetic wood by increasing the dispersibility of wood flour, crushed reeds and synthetic resin. The lubricant may include, but is not limited to, stearic acid, polyethylene wax, and paraffin wax.

The antioxidant is a material used to prevent the deterioration or discoloration of mechanical properties by preventing the access of oxygen supplied from the air to the synthetic wood, phosphate-based antioxidants and calcium stearate (Calcium Stearate) But it is not limited thereto.

The flame retardant is a material used to suppress the combustion of synthetic resins that are easy to burn and to improve the flame resistance in the production of synthetic wood, including tricresyl phosphate, chlorinated paraffin and antimony oxide, Inorganic substances such as ammonium phosphate and boric acid may be used, but are not limited thereto.

The heat stabilizer is a material used to minimize decomposition by heat in the manufacturing process of synthetic wood, and serves to maintain the original color of the pigment during processing and improve the lubricity of the synthetic resin. The heat stabilizer may be an epoxidized vegetable oil such as epoxidized Soy Bean Oil and epoxidized Linseed Oil, but is not limited thereto.

The UV absorber is a material used to block and absorb ultraviolet rays from the sun to prevent the mechanical properties or color of the synthetic wood from changing, benzophenone, benzotriazole, salicylic acid ) And acrylonitrile may be used, but is not limited thereto.

The mineral fillers (Mineral Fillers) is a material used to prevent deformation due to impact, heat and load, and serves to improve the lubricity and processability of the synthetic wood and to absorb the moisture contained in the wood and reed flour. The mineral filler may be calcium carbonate, talc and mica, but is not limited thereto.

In the step (S5), the processing aid, UV absorber and mineral filler is preferably 5% to 15% by weight relative to the total weight of the synthetic wood composition. If the processing aid, UV absorber and mineral filler is less than 5% by weight relative to the total weight of the synthetic wood composition may cause a problem that the mechanical strength of the synthetic wood and the stability to heat or light is lowered.

The colorant (Stain) is a material used to impart color stability of the synthetic wood and to prevent discoloration, and may exhibit a texture of natural wood and may improve resistance to ultraviolet rays. The colorant may be an oil colorant (Oil-Stain), an alcoholic colorant, an aqueous colorant, NGR (Non Grain Raisine) stain, a pigment colorant, and Unistein, but are not limited thereto.

The pigment colorant serves to protect the synthetic wood from the outside by adding to the pre-synthetic wood composition and to give a color or three-dimensional impression to improve the texture of the wood. In addition, the staining and coloring of the dyed wood flour and crushed reeds serves to control the incomplete portion, thereby smoothly reconditioning the dyeing state of the wood flour and crushed reeds. In the present invention, inorganic dyes having strong light resistance, heat resistance and solvent resistance are used, and more preferably, extender pigments can be used.

The extender pigment (Extender Filler) is a transparent pigment with a low hiding power used in various formulations in the production of pigments, paints, optical properties of the material by mixing with paints, printing inks, plastics, rubber, paper, adhesives, etc. It plays a role to improve the property and fluidity. The extender pigment is preferably a natural extender pigment such as white germ, gypsum, kaolin, but is not limited thereto.

Unistein (Unistain) is a colorant prepared by dissolving an organometallic composite dye in an organic solvent, chemical resistance, light resistance, weather resistance, colorability, dryness and workability is good and does not swell wood. In addition, when staining occurs in the stained wood powder and crushed reeds (S2), the color of the wood powder and crushed reeds can be uniformly represented by complementing, and the unit stain is used in addition to the drying step (S3) Can be.

In the step (S5), the colorant is preferably 20 to 30% by weight relative to the total weight of the synthetic wood composition. If the colorant is 20% by weight or less relative to the total weight of the synthetic wood composition, the color of the synthetic wood is not properly expressed, and if the colorant is 30% by weight or more, the dispersibility of the colorant is lowered, the vividness of color is lowered, and the resistance and durability of the synthetic wood are lowered. Problems may arise.

The step (S5) can be sufficiently mixed by adding any one or more selected from the group consisting of processing aids, UV absorbers, mineral fillers and colorants to the pre-synthetic wood composition using a stirred mixer, a temperature of 60 ℃ to 70 ℃ It may be carried out in but not limited to.

After performing the step (S5), the synthetic wood composition is extrusion molded (S6).

The step (S6) is to extrude the synthetic wood composition using a extruder at a pressure of 20 kgf / cm 2 to 35 kgf / cm 2 at a temperature of 160 ℃ to 200 ℃, to obtain a synthetic wood composition in the form of a gel. The synthetic wood composition may be cooled and cut to be used as a building material for a desired use. The method for producing the synthetic wood composition is not limited to the extrusion molding method, any method for obtaining a synthetic wood composition such as injection molding can be used.

In addition, the present invention after adding any one or more selected from the group consisting of processing aids, UV absorbers, mineral fillers and colorants to the pre-synthetic wood composition to form a synthetic wood composition (S5), coffee to the synthetic wood composition After the step of adding the powder (S16), it may be a method for producing a pollution-free reed synthetic wood to perform the step (S17) of extruding the synthetic wood composition to which the coffee powder is added.

Hereinafter, with reference to Figure 2 will be described in detail a method for producing a pollution-free reed synthetic wood according to another embodiment of the present invention.

Prior to the description, the method of manufacturing a pollution-free reed synthetic wood to which coffee powder is added is another embodiment of the present invention compared with the manufacturing method according to the embodiment of Figure 1 S1 to S5 is the same, and thus the present production method In the detailed description thereof will be omitted, it will be described directly from the step (S16) of adding the coffee powder to the synthetic wood composition.

The coffee powder is to use the residue left after making coffee by extracting the coffee beans, it serves as a colorant that can be colored on the surface of the synthetic wood to give a natural brown light. In addition, by using the coffee powder can reduce the amount of colorant used can reduce the cost.

In the step (S16), the coffee powder is preferably 5% to 10% by weight relative to the total weight of the synthetic wood composition. If the coffee powder is less than 5% by weight relative to the total weight of the synthetic wood composition, the color and aroma of the coffee powder does not appear properly. If the coffee powder is more than 10% by weight, the amount of pigment colorant and unsteine is reduced, so that staining may not be compensated for incomplete dyeing. Problems may arise.

In the step S16, the color of the coffee powder is colored on the surface of the synthetic wood by using the coffee powder, so that the natural color and texture of the coffee may be represented, rather than an artificial coffee color caused by the pigment. Aroma can be expressed.

After performing the step (S16), the synthetic wood composition to which the coffee powder is added is extruded (S17).

The step (S17) is to extrude the synthetic wood composition using a extruder at a pressure of 20 kgf / cm 2 to 35 kgf / cm 2 at a temperature of 160 ℃ to 200 ℃, to obtain a synthetic wood composition in the form of a gel. The synthetic wood composition may be cooled and cut to be used as a building material for a desired use. The method for producing the synthetic wood composition is not limited to the extrusion molding method, any method for obtaining a synthetic wood composition such as injection molding can be used.

In other words, the step (S17) is different only in that it proceeds after the step of S16 compared to the step S6 of the embodiment, the overall process of extrusion molding such as temperature and pressure is the same as the step S6.

Hereinafter, the present invention will be described in more detail with reference to Examples. These examples are only for illustrating the present invention in more detail, it will be apparent to those skilled in the art that the scope of the present invention is not limited by these examples in accordance with the gist of the present invention. .

<실시예 1> 무공해 갈대 합성 목재 제조단계<Example 1> pollution-free reed synthetic wood manufacturing step

(1) After maintaining the humidity at 3% to 5% by using the humidity controller, put 35% by weight of the wood powder and 25% by weight of the crushed wood powder into a particle size of 100 Mesh into a container at a temperature of 60 ℃ to 70 ℃ Heat removes formaldehyde.

(2) A dye is added to the wood powder and the pulverized reed from which the formaldehyde has been removed, and the wood powder and the pulverized reed particles themselves are dyed at a temperature of 40 ° C. to 50 ° C. using an infrared light lamp.

(3) The dyed wood flour and pulverized reeds are dried using a far-infrared air blower at a temperature of 70 ° C. to 80 ° C. so that the water content of the wood flour and pulverized reeds becomes 8% to 12%.

(4) 8% by weight of a synthetic resin is mixed with the dried wood powder and pulverized reed under a temperature of 70 ° C to 80 ° C to form a pre-synthetic wood composition.

(5) 10 wt% of the processing aid, the UV absorber and the mineral filler are added to the presynthetic wood composition, 30 wt% of the colorant is added, and mixed using a stirring mixer at a temperature of 60 ° C. to form a synthetic wood composition.

(6) The synthetic wood composition is extruded using a extruder at a temperature of 180 ° C. at a pressure of 30 kgf / cm 2 to prepare a material of synthetic wood.

(7) The synthetic wood material is cooled, cut and vacuum packed.

<실시예 2> 커피 분말이 첨가된 무공해 갈대 합성 목재 제조단계<Example 2> pollution-free reed synthetic wood manufacturing step to which coffee powder is added

(5) Add 10% by weight of the processing aid, the UV absorber and the mineral filler to the pre-synthetic wood composition, add 20% by weight of the colorant and 10% by weight of the coffee powder, and mix by mixing using a stirring mixer at a temperature of 60 ° C. Make a wood composition.

(7) The synthetic wood material is cooled, cut and vacuum packed.

By removing formaldehyde before mixing the presynthetic wood composition in step (1) of <Example 1> and <Example 2>, the concentration of formaldehyde released from the synthetic wood can be reduced to 0.08 ppm to 0.1 ppm. have. The concentration indicates the WHO and Japanese indoor environmental standards, and the effect on the human body by the concentration of formaldehyde is shown in Table 1 below.

Table 1

Concentration (ppm)	Occurring beds and reference values
0.01	Lower limit of measurement of formaldehyde measuring instrument
0.04	Sensitive children develop atopic dermatitis, nervous system irritation begins
0.05 to 1.0	Feeling the smell. Canada, California Indoor Standard
0.08	WHO standard. Japanese Indoor Environment Standards (Welfare Guidelines)
0.1	Prohibit the sale of products with higher concentrations in Germany
0.2	Irritation in the eye begins
0.25 to 0.33	Respiratory tract initiation
0.5	Lowest point at which throat irritation begins. Industrial Hygiene Society Allowable Concentration (Maximum of Factory, etc.)
1.0	After five years of life, 14 out of 10,000 people will develop cancer
2.0 to 3.0	I have a pain in my eyes.
4.0	Tears come out
10.0-20.0	Violently tears come out. Difficulty breathing
30.0 to 50.0	Causes acute poisoning in 5 to 10 minutes. Possibility to die of toxic emphysema Upper limit of measurement of formaldehyde meter (50.0 ppm)

As shown in Table 1, since 0.08 ppm to 0.1 ppm is a concentration of harmless to the human body as a reference value of the WHO, the pollution-free reed synthetic wood of the present invention is an environmentally friendly and can be seen that the synthetic wood that can minimize the harmful substances to the human body Can be.

Claims

(a) removing formaldehyde from wood flour and ground reeds;

(b) dyeing by adding dye to the wood powder from which the formaldehyde has been removed and the pulverized reed;

(c) drying the dyed wood flour and ground reeds;

(d) mixing a synthetic resin with the dried wood powder and ground reeds to form a pre-synthetic wood composition;

(e) adding at least one selected from the group consisting of processing aids, UV absorbers, mineral fillers and colorants to form the synthetic wood composition; And

(f) a method for producing a pollution-free reed synthetic wood comprising the step of extruding the synthetic wood composition.
The method of claim 1,

Step (a) is a method for producing a pollution-free reed synthetic wood, characterized in that carried out at 50 ℃ to 80 ℃.
The method of claim 1,

Step (b) is a method for producing a pollution-free reed synthetic wood, characterized in that carried out at 30 ℃ to 60 ℃.
The method of claim 1,

The wood flour is 30 to 40% by weight relative to the total weight of the synthetic wood composition;

The pulverized reed is 20 to 30% by weight relative to the total weight of the synthetic wood composition;

The synthetic resin is 5 to 10% by weight based on the total weight of the synthetic wood composition;

The processing aids, UV absorbers and mineral fillers are 5% to 15% by weight relative to the total weight of the synthetic wood composition; And

The colorant is a method for producing a pollution-free reed synthetic wood, characterized in that 20 to 30% by weight relative to the total weight of the synthetic wood composition.
The method of claim 1,

The step (c) is a method for producing a pollution-free reed synthetic wood, characterized in that the drying so that the moisture content of the pre-synthetic wood composition is 5% to 15%.
The method of claim 1,

The processing aid in step (e) is a method for producing a pollution-free reed synthetic wood, characterized in that any one or more selected from the group consisting of binders, lubricants, antioxidants, flame retardants and heat stabilizers.
A pollution-free reed synthetic wood prepared by the method according to any one of claims 1 to 6.
(a) removing formaldehyde from wood flour and ground reeds;

(b) dyeing by adding dye to the wood powder from which the formaldehyde has been removed and the pulverized reed;

(c) drying the dyed wood flour and ground reeds;

(d) mixing a synthetic resin with the dried wood powder and ground reeds to form a pre-synthetic wood composition;

(e) adding at least one selected from the group consisting of processing aids, UV absorbers, mineral fillers and colorants to form the synthetic wood composition;

(f) adding coffee powder to the synthetic wood composition; And

(g) a method for producing a pollution-free reed synthetic wood comprising the step of extruding the synthetic wood composition to which the coffee powder is added.
The method of claim 8,

The wood flour is 30 to 40% by weight relative to the total weight of the synthetic wood composition;

The pulverized reed is 20 to 30% by weight relative to the total weight of the synthetic wood composition;

The synthetic resin is 5 to 10% by weight based on the total weight of the synthetic wood composition;

The processing aids, UV absorbers and mineral fillers are 5% to 15% by weight relative to the total weight of the synthetic wood composition;

The colorant 15% to 25% by weight relative to the total weight of the synthetic wood composition; And

The coffee powder is a method for producing a pollution-free reed synthetic wood, characterized in that 5% to 10% by weight relative to the total weight of the synthetic wood composition.
A pollution-free reed synthetic wood prepared by the process according to claim 8.