KR101897017B1 - Eco-friendly wood polymer composite having high impact strength - Google Patents

Abstract

The present invention relates to wood fibers; And 50 to 80% by weight of an acrylate or methacrylate monomer, and 20 to 50% by weight of a styrene monomer.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an eco-friendly synthetic wood having high impact strength,

The present invention relates to an environmentally friendly synthetic wood having high impact strength. More particularly, the present invention relates to an environmentally friendly synthetic wood having high impact strength and low moisture absorption rate that can replace natural wood.

Generally, wood is widely used as a natural material, but it is weak in moisture, and maintenance cost is inconvenient due to cracking and breaking over time. This wood has been supplemented with the disadvantages of synthetic wood (WPC: Wood Polymer / Plastic Composite). Synthetic wood is produced by extruding or injection molding the mixture as a mixture of polymer resin and additives, containing more than 50% of wood fibers so as to have appearance or properties similar to natural wood, and to form a product similar to wood. These synthetic woods have almost no deformation such as discoloration, cracking, and breakdown, which are disadvantages of ordinary wood. Unlike natural wood, it is especially resistant to moisture, so it does not rot easily even when used as exterior materials. Due to these advantages, natural wood and wood preservatives are being replaced, and the market size is gradually increasing. However, in the case of conventional synthetic wood, physical properties such as compressive strength and impact strength are somewhat weak due to the use of wood flour as a main material.

In addition, although synthetic wood is produced from a polyolefin-based resin in Korean Patent No. 10-0983970 and Korean Patent No. 10-1073774, the polyolefin-based resin has a disadvantage in that tensile, compressive, bending and impact strength are lowered. Korean Patent Publication No. 10-2011-0099416 also discloses synthetic wood using ABS resin. Since ABS resin contains chemically unstable double bonds in the rubber component inside the resin, the rubber component can be aged easily due to ultraviolet rays, so that the weather resistance and light resistance are poor, and if left for a long time outdoors, It is disadvantageous in that it is not suitable for outdoor use in which exposure to sunlight is relatively large.

Although methacrylate resin having excellent weatherability and high mechanical strength has been conventionally produced as synthetic wood, methacrylate resin is suitable for the production of synthetic wood because the process temperature required for the extrusion process is so high that the wood particles are damaged. I could not. In order to solve this problem, it has been attempted to improve the mechanical properties of the wood by immersing the wood in the monomer mixture solution to improve the mechanical properties of the wood. However, when the wood is immersed in the monomer mixture solution, the physical properties of the whole wood are uneven due to uneven application and dispersibility. Also, it is difficult to produce synthetic wood because the production time can not be shortened due to time, cost, necessity of removal of solvent and initiator in polymerization, uneven physical properties, and so on. As described above, there remains a problem to be solved in making a synthetic wood which can increase the impact strength uniformly physical property without deteriorating the properties of the methacrylate resin.

Korean Patent No. 10-1073774 Korean Patent No. 10-0983970 Korean Patent Publication No. 10-2011-0099416

Disclosure of the Invention In order to solve the problems of the prior art as described above, it is an object of the present invention to provide a synthetic wood having improved impact strength by producing a synthetic wood including a copolymer of an acrylate or methacrylate monomer and a styrene- .

It is another object of the present invention to provide a synthetic wood having a low moisture absorption rate and minimizing deformation such as cracking and breakage due to external environment.

It is also an object of the present invention to provide a synthetic wood improved in kneading degree between a copolymer of an acrylate or methacrylate monomer or a styrene monomer and wood fibers during extrusion or injection molding.

To achieve the above object, the present invention provides a synthetic wood comprising wood fibers; And 50 to 80% by weight of an acrylate-based or methacrylate-based monomer, and 20 to 50% by weight of a styrene-based monomer.

The synthetic wood may comprise 30 to 90% by weight of the wood fibers and 10 to 70% by weight of the copolymer.

The acrylate-based or methacrylate-based monomer may be at least one selected from the group consisting of methyl methacrylate, methyl acrylate, ethyl acrylate, n-butyl acrylate, t-butyl acrylate, 2-ethylhexyl methacrylate, Benzyl methacrylate, or a mixture of two or more thereof.

The styrene-based monomer may be any one or a mixture of two or more selected from styrene,? -Methylstyrene, p-bromostyrene, p-methylstyrene, p-chlorostyrene and o-bromostyrene.

The synthetic wood may be one in which the wood fiber and the copolymer are produced by extrusion or injection molding.

The synthetic wood may further include any one or two or more additives selected from a coupling agent, an antioxidant, a UV absorber, a colorant, and a lubricant.

The synthetic wood may have a Charpy impact strength measured according to ISO 179 of 3.0 kJ / m 2 or more and a moisture absorption rate measured according to KS F 3230 of 1.9% or less.

The synthetic wood according to the present invention has an advantage that it can have a high impact strength by producing a synthetic wood including a copolymer of an acrylate type or methacrylate type monomer and a styrene type monomer.

The synthetic wood according to the present invention has a low moisture absorption rate and has an advantage of minimizing deformation such as cracking and breakage due to the external environment.

The synthetic wood according to the present invention has a high impact strength, so that the degree of kneading of an acrylate or methacrylate monomer or a copolymer of a styrene monomer and a wood fiber is improved during extrusion or injection molding, It has an advantage that it can have appearance and properties such as texture and the like.

FIG. 1 is a photograph showing the dispersibility of wood fibers observed by a scanning electron microscope (SEM) on synthetic wood according to an embodiment of the present invention.
FIG. 2 is a photograph showing the dispersibility of wood fibers by scanning electron microscopy (SEM) of synthetic wood according to a comparative example of the present invention.

Hereinafter, the eco-friendly synthetic wood having a high impact strength according to the present invention will be described in more detail by way of examples. It should be understood, however, that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention.

Unless otherwise defined, all technical and scientific terms have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

The present invention relates to an environmentally friendly synthetic wood having high impact strength.

The present invention will be described in detail,

To achieve the above object, the present invention provides a synthetic wood comprising wood fibers; And 50 to 80% by weight of an acrylate-based or methacrylate-based monomer, and 20 to 50% by weight of a styrene-based monomer. Preferably wood fibers; And 60 to 80% by weight of an acrylate-based or methacrylate-based monomer monomer, and 20 to 40% by weight of a styrene-based monomer. Preferably wood fibers; And 65 to 75% by weight of an acrylate or methacrylate monomer, and 25 to 35% by weight of a styrene monomer.

According to an embodiment of the present invention, the acrylate-based or methacrylate-based monomer may be at least one selected from the group consisting of methyl methacrylate, methyl acrylate, ethyl acrylate, n-butyl acrylate, t-butyl acrylate, , Lauryl methacrylate, benzyl methacrylate, and the like, or a mixture of two or more thereof. The acrylate-based or methacrylate-based monomer may contain 50 to 80% by weight, preferably 60 to 80% by weight, more preferably 65 to 75% by weight of the monomer mixture. If the content of the acrylate or methacrylate monomer of the copolymer of the present invention is less than 50% by weight, the mechanical properties and the weather resistance of the copolymer decrease. When the content of the acrylate or methacrylate monomer exceeds 75% by weight, , It has poor appearance of synthetic wood and low impact strength. Accordingly, when the copolymer of the present invention includes an acrylate or methacrylate monomer within the above range, it is preferable to improve the processability, weather resistance, chemical resistance, and heat resistance of the synthetic wood.

According to one embodiment of the present invention, the styrenic monomer is any one or a mixture of two or more selected from styrene,? -Methylstyrene, p-bromostyrene, p-methylstyrene, p-chlorostyrene, o- Lt; / RTI > The styrenic monomer may contain 20 to 50% by weight, preferably 20 to 40% by weight, more preferably 25 to 35% by weight of the monomer mixture. When the content of the styrene monomer of the copolymer of the present invention is less than 20% by weight, miscibility with the wood fibers is reduced due to low aromatic group content in the copolymer, thereby increasing the moisture absorption rate, There is a problem that the impact strength sharply drops due to a sudden increase in rigid structure. Accordingly, the copolymer of the present invention includes a styryl monomer excellent in copolymerization with an acrylate or methacrylate monomer within the above-mentioned range, and is useful as an aromatic compound such as styrene-based aromatic group and lignin in wood fiber The compatibility of the copolymer and the wood fiber is improved, so that it can have appearance and properties such as color, texture and the like similar to natural wood. In addition, it is preferable that the synthetic wood can have a low moisture absorption rate and a high impact strength.

The copolymer prepared as described above is more preferable because it can have a high impact strength and a low moisture absorption rate as well as a processing temperature that does not damage the synthetic wood during processing.

The copolymer of the present invention may have a weight average molecular weight of 50,000 to 300,000 g / mol according to an embodiment. Preferably 100,000 to 250,000 g / mol, but is not limited thereto. When the weight average molecular weight is in the above range, the fluidity is improved and the degree of kneading with the wood fibers during extrusion or extrusion is improved, and the impact strength of the synthetic wood produced from the wood fiber is improved.

The copolymer of the present invention has a glass transition temperature (Tg) of 90 to 110 캜 and a melt index (MI) of 5 to 10 g / 10 min measured at 230 캜 under a load of 3.8 kg for kneading property and workability with wood fiber But is not limited thereto.

The method for producing the copolymer is not particularly limited as long as it can satisfy the above-mentioned molecular weight, and can be produced using conventional emulsion polymerization, bulk polymerization or suspension polymerization. The polymerization may be carried out by adding an initiator, a chain transfer agent, or the like to the monomer polymerization solution according to an embodiment of the polymerization, but is not limited thereto.

In one embodiment of the present invention, the wood fibers can be selected from wood pulp, squalene wood and economically unharmonious woods such as a broad-leaved tree, a needlewood, and the like. Specific examples include any one selected from the group consisting of birch, maple, oak, oak, lacquer, oak, oak, oak, bark, cedar, cedar, conifer, pine, Wood fiber blends of two or more woods can be used.

The wood fibers of the present invention may be in a powder form, and the wood fibers may have an average particle diameter of 10 to 800 mu m, and preferably an average particle diameter of 50 to 500 mu m. In the case of wood fibers having the above-mentioned size, it is possible to prevent the wood fibers from being clumped when mixed with the copolymer, so that uniform physical properties can be realized according to even dispersion of the wood fibers. Accordingly, high impact strength and low moisture absorption Can be expressed.

Since the wood fiber contains a large amount of water in a natural state, it is preferable to undergo a drying process to remove moisture. The drying process may be performed by heating at a temperature of 80 to 120 ° C to dry the wood fiber so that the water content of the wood fiber is 1 to 20% by weight. As described above, there is no deformation of the structure of the wood fiber itself during drying, so that only moisture can be removed, which is preferable.

According to an embodiment of the present invention, the synthetic wood may comprise 30 to 90% by weight of wood fibers and 10 to 70% by weight of a copolymer. The synthetic wood according to the present invention is preferable because it contains a copolymer in the above content to improve the kneadability with wood fibers, facilitate extrusion or injection molding, have a high impact strength and a low moisture absorption rate. In addition, it is preferable because the original texture of the wood fiber can be sufficiently expressed and the appearance of natural wood can be expressed.

According to one aspect of the present invention, the synthetic wood may be one in which the wood fibers and the copolymer are produced by extrusion or injection molding.

Specifically, in the method of producing synthetic wood according to an embodiment of the present invention, a method of producing a synthetic wood comprises a step of mixing wood fibers, 50 to 80% by weight of an acrylate or methacrylate monomer, 20 to 50% The composition comprising the copolymer of the mixture may be prepared by extrusion or injection molding.

As a specific example, the synthetic wood of the present invention comprises, in an embodiment, a) an aerial of a monomer mixture comprising 50 to 80% by weight of wood fibers and 50 to 80% by weight of an acrylate or methacrylate monomer, and 20 to 50% Mixing the composition comprising the combination;

b) injecting and kneading the composition into an extruder and extruding the mixture into pellets; And

c) drying the pellets followed by molding to produce synthetic wood.

According to one embodiment of the present invention, the extrusion molding has the advantages of increasing the coalescence and creaming flocculation, which are factors necessary for improvement of the processing speed, precision of molding, dimensional stability, etc., I can raise it. The synthetic wood may have an extrusion temperature of 200 to 225 캜, preferably 200 to 220 캜, in order to substantially avoid carbonization of the wood fiber. Conventional standard polymethylmethacrylate does not exhibit viscoelastic flow at less than 230 캜, which makes it difficult to produce synthetic wood. However, the synthetic wood of the present invention has a sufficient fluidity in a molten state of the copolymer at the above temperature, Mars can have.

The extrusion-molded pellets of the present invention can be produced by any one or two or more mixing molding methods selected from compression molding, profile extrusion, transfer molding, injection molding, blow molding and extrusion molding in an additional molding process, The synthetic wood can be manufactured.

The synthetic wood according to an embodiment of the present invention may further comprise one or more additives selected from couplers, antioxidants, UV absorbers, colorants, lubricants and the like according to an embodiment. The additive may be added in an amount of 0.1 to 15 parts by weight based on 100 parts by weight of the wood fiber and the copolymer, without impairing the object of the present invention. More preferably 0.5 to 8 parts by weight, but is not limited thereto.

According to one embodiment of the present invention, the coupling agent can increase the compatibility of the wood fiber and the copolymer to have an excellent impact strength. The wood fiber exhibits hydrophilic polarity, and the copolymer has a non-polar nature which is hydrophobic, so that the binding force of the two materials is weak. Thus, by adding a coupling agent to the wood fiber and the copolymer, a new chemical bond is formed at the interface between the two materials to form a rigid bonding structure, so that a more improved impact strength can be obtained. Specific examples of the coupling agent include styrene-maleic anhydride (SMA), styrene-ethylene-butyleneimide block graft maleic anhydride (SEBS-g-MA), styrene-acrylonitrile grafted maleic anhydride (SAN-g-MA ), Etc. may be used. Preferably, maleic anhydride-copolymerized styrene or the like may be used so as to improve compatibility with the copolymer of the present invention.

According to one embodiment of the present invention, the antioxidant suppresses deterioration, deterioration, cracking, discoloration or the like of the molded product during the molding process or the molded product due to the influence of oxygen, heat, light or the like under practical environmental conditions can do. In the present invention, it is preferable to use a phenol-based antioxidant, but the present invention is not limited thereto.

According to one embodiment of the present invention, the UV absorber may be any one selected from a benzophenone compound, a benzotriazole compound, an aromatic benzoate compound, an oxalic acid anilide compound, a cyanoacrylate compound and a hindered amine compound, It is preferred, but not limited, to use two or more mixtures. By using the UV absorbent, it is possible to selectively absorb ultraviolet rays in sunlight to prevent the material from being decomposed from ultraviolet rays, which is preferable.

According to one aspect of the present invention, the lubricant can achieve excellent processability and low processing temperature of synthetic wood. A particular lubricant which may be used is, for example, any one or a mixture of two or more selected from polyolefins, polar ester waxes, polyethylene waxes, carboxylic acids and fatty acids, and their esters or long chain fatty alcohols and fatty alcohol esters But is not limited thereto.

According to one embodiment of the present invention, the colorant may be included to impart color stability, and may be added in a coloring process in accordance with a required color. The colorant may be prepared by mixing pigments, dyes, etc. with an organic solvent. The pigments and dyes are not particularly limited as long as they are generally used in synthetic wood.

The synthetic wood produced according to an embodiment of the present invention may have a Charpy impact strength measured according to ISO 179 of 3.0 kJ / m 2 or more and a moisture absorption rate measured according to KS F 3230 of 1.9% or less. Preferably, the Charpy impact strength measured according to ISO 179 is 3.3 kJ / m 2 or more, and the moisture absorption rate measured based on KS F 3230 may be 1.5% or less. When such physical properties as mentioned above are applied, it is possible to minimize the deformation such as cracking and breakage due to the external environment, and the copolymerization of acrylate or methacrylate monomer, styrene monomer and wood fiber during extrusion or injection molding It has improved appearance and can have appearance and properties like color, texture and the like of natural wood.

Since the synthetic wood of the present invention has a higher impact strength and a lower moisture absorption rate than natural wood, it can be used as a substitute for the appearance of natural wood such as flooring, building materials, ornaments, furniture, And can be applied to various fields that can provide a better impact strength and a lower moisture absorption rate.

Hereinafter, the eco-friendly synthetic wood having a high impact strength according to the present invention will be described in more detail by way of examples. It should be understood, however, that the invention is not limited to the disclosed embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention.

Unless otherwise defined, all technical and scientific terms have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

In addition, the unit of the additives not specifically described in the specification may be% by weight.

[Measurement of physical properties]

1. Charpy impact strength

The impact strength test was carried out in accordance with KS M ISO 179-1 as a notch-free test specimen. The specimen size was measured as 80 ± 2 × 10 ± 0.2 × 4 ± 0.2 (unit: ㎜), and the dimensions of the specimen (thickness h, width b and length l) were defined as h ≤ b ≤ l. The impact surface is the exposed surface during the construction of the product, and the average value of five specimens is expressed in units of kJ / m 2 by calculating the impact strength acU according to the following formula.

Here, Ec is the corrected absorbed energy (J) due to breakage of the test piece,

          h: Thickness of specimen (mm)

          b: Width of specimen (mm)

2. Flexural maximum load

The width and thickness of the specimen were in accordance with the shape of the produced product and the length was 100 mm longer than the maximum spacing between supports during construction. However, when the width of the product exceeds 160 ㎜, the width was cut to (150 ± 10) ㎜ by consultation between the parties. For products that do not specify the distance between supports during construction, the length of the specimen is 600 mm. According to KS M ISO 178, the radius and the test speed of the pressure rod and the support were determined, and the maximum flexural load was measured by mounting the specimen as shown in <Figure 1>. The test surface was exposed at the time of construction, and three samples were tested and the average value was recorded.

<Figure 1> Flexural Maximum Load Test System

3. Moisture Absorption Rate

Specifically, the specimens were pretreated before reaching the content at the conditions of (20 ± 3) ° C. and relative humidity (66 ± 2)% before the moisture absorption rate test Weights were measured with an accuracy of 0.01 g or more. Mass specimens were processed under the following conditions and mass changes were recorded. The specimen is immersed in water at 100 DEG C for 5 hours. At this time, a suitable jig was used so that the test piece could be immersed without touching the bottom of the water tank. The immersed specimen was immediately immersed in water (23 ± 2) ° C. and allowed to stand for 20 minutes. The water content on the surface of the specimen was completely removed, and the mass change rate was measured.

Mass change rate (%) =

Here, W ₁ = mass before immersion (g), W ₂ = mass after immersion (g)

[Example 1]

21 parts by weight of a copolymer (LGMMA, HX238, weight average molecular weight 120,000 _g / mol, Tg: 105 ° C, MI: 8 g / 10 min) composed of 70% by weight of methyl methacrylate and 30% 70 parts by weight of an average particle size of 200-500 μm and 6 parts by weight of styrene binder copolymerized with maleic anhydride (XIRAN ^® SZ22065) were extruded at 210 ° C. in two steps of compounding and profile extrusion, The properties are shown in Table 1.

 [Example 2]

In Example 1, 0.2 part by weight of n-octylmercaptan was added to 100 parts by weight of a monomer mixture containing 60% by weight of methyl methacrylate and 40% by weight of styrene, to prepare a polymerization solution. (Weight average molecular weight: 120,000 _g / mol, Tg: 105 ° C, MI: 8 _g , manufactured by Bulk Polymerization at a temperature of 150 ° C., / 10 min) was used.

[Example 3]

In Example 1, 0.2 part by weight of n-octylmercaptan was added to 100 parts by weight of a monomer mixture obtained by mixing 80% by weight of methyl methacrylate and 20% by weight of styrene, to prepare a polymerization solution. (Weight average molecular weight: 120,000 _g / mol, Tg: 105 ° C, MI: 8 _g , manufactured by Bulk Polymerization at a temperature of 150 ° C., / 10 min) was used.

 [Example 4]

(LGMMA Company, HX208, weight average molecular weight 200,000 _g / mol, Tg: 105 ° C, MI: 8 g / 10 min) prepared from 50% by weight of methyl methacrylate and 50% by weight of styrene . &Lt; / RTI &gt;

 [Comparative Example 1]

In Example 1, 0.2 part by weight of n-octylmercaptan was added to 100 parts by weight of a monomer mixture containing 90% by weight of methyl methacrylate and 10% by weight of styrene, to prepare a polymerization solution. (Weight average molecular weight: 120,000 _g / mol, Tg: 110 ° C, MI: 2 _g) having a weight average molecular weight of 120,000 _g / mol was prepared by charging the prepared polymerization solution into a polymerization reactor having a stirrer, a thermometer, a nitrogen inlet and a circulating condenser, / 10 min) was used.

[Comparative Example 2]

Except that polymethyl methacrylate (LGMS, HP202) was used in place of the copolymer in Example 1.

[Comparative Example 3]

Except that polystyrene (HIPS 65 IHE) was used in place of the copolymer in Example 1.

[Comparative Example 4]

Except that 50 parts by weight of polymethylmethacrylate (LGMS, HP202) and 50 parts by weight of polystyrene (HIPS 65 IHE) were used in place of the copolymer in Example 1.

Flexural maximum load (N) Charpy
Impact strength
(kJ / m 2) Water Absorption Rate (%) 5 hours Example 1 6,627 3.70 0.7 Example 2 5,121 3.29 1.1 Example 3 5,926 3.42 1.3 Example 4 4,015 2.90 1.7 Comparative Example 1 5,146 3.31 2.0 Comparative Example 2 4,566 3.20 2.7 Comparative Example 3    2,043 1.90 7.5 Comparative Example 4    2,105 2.00 7.1

As shown in Table 1, it was confirmed that the synthetic wood of Examples of the present invention had a high impact strength and a low moisture absorption rate. In addition, the synthetic wood of the examples of the present invention was excellent in the miscibility of the wood fiber and the copolymer and was excellent in porosity and dispersibility due to no aggregation of wood powder. As a result, it was confirmed that deformation due to an external impact was small and the impact resistance was further improved.

Specifically, in the case of Examples 1 to 3 in which the content of styrene in the copolymer was 20, 30 and 40 wt% in the production of synthetic wood, styrene was highly miscible with wood fibers, so that the aggregation of wood fibers was remarkably reduced, And a uniformly synthetic wood as a whole was obtained. As a result, the maximum flexural load, Charpy impact strength and moisture absorption rate were both excellent, whereas in Example 4, in which the content of styrene was 50% by weight, the compatibility with wood fibers was decreased The results showed that the maximum flexural load, Charpy impact strength and moisture absorption rate were slightly decreased.

In Comparative Example 2, as shown in FIG. 2, since the copolymer had no aromatic groups, the miscibility with the wood fibers was reduced, and the aggregation of the wood fibers resulted in a large amount of pores in the synthetic wood and the maximum flexural load, The moisture absorption rate was slightly decreased.

In addition, the physical mixture of polystyrene alone or polystyrene and polymethyl methacrylate of Comparative Example 4 is presumed to have decreased miscibility with wood fibers due to the increase in the content of styrene in Example 5, and in particular, As the units were not covalently bonded to each other and existed as separate polymers, the synergistic effect by the respective repeating units was not exhibited. As a result, the flexural maximum load, the Charpy impact strength and the moisture absorption rate were all significantly lowered.

The synthetic wood according to the present invention has an increased miscibility with the wood fiber due to the copolymerization of the styrene-based repeating unit and the methacrylate-based repeating unit, and the miscibility with the wood fiber is particularly excellent in the specific content range of styrene in the copolymer , It was confirmed that the flexural maximum load, the Charpy impact strength and the moisture absorption rate, which are physical properties of the synthetic wood, are remarkably improved.

 As described above, in the present invention, eco-friendly synthetic wood having a high impact strength has been described through the specified matters and the limited embodiments. However, the present invention is provided for better understanding of the present invention. It is to be understood that the invention is not limited to those precise embodiments, and various modifications and changes may be made thereto by those skilled in the art.

Accordingly, the spirit of the present invention should not be construed as being limited to the embodiments described, and all of the equivalents or equivalents of the claims, as well as the following claims, belong to the scope of the present invention .

Claims (7)

Wood fiber;
A copolymer of a monomer mixture comprising 50 to 80% by weight of an acrylate-based or methacrylate-based monomer and 20 to 50% by weight of a styrene-based monomer; And
Styrene-maleic anhydride (SMA) copolymer, styrene-ethylene-butylanime midblock grafted maleic anhydride (SEBS-g-MA) copolymer and styrene-acrylonitrile grafted maleic anhydride (SAN-g-MA) A binder containing one or two or more of the above-mentioned components, followed by extrusion or injection molding. The method according to claim 1,
Wherein the synthetic wood comprises 30 to 90% by weight of wood fibers and 10 to 70% by weight of a copolymer. The method according to claim 1,
The acrylate-based or methacrylate-based monomer may be at least one selected from the group consisting of methyl methacrylate, methyl acrylate, ethyl acrylate, n-butyl acrylate, t-butyl acrylate, 2-ethylhexyl methacrylate, Benzyl methacrylate, and mixtures thereof. The method according to claim 1,
Wherein the styrenic monomer is any one or a mixture of two or more selected from styrene,? -Methylstyrene, p-bromostyrene, p-methylstyrene, p-chlorostyrene, and o-bromostyrene. delete The method according to claim 1,
Wherein the synthetic wood further comprises any one or two or more additives selected from antioxidants, UV absorbers, colorants and lubricants. The method according to claim 1,
Wherein said synthetic wood has a Charpy impact strength measured according to ISO 179 of not less than 3.0 kJ / m &lt; 2 &gt;, and a moisture absorption rate measured according to KS F 3230 of not more than 1.9%.

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