KR101012829B1 - Composition for synthetic wood and manufacturing method of synthetic wood using the same - Google Patents

Abstract

PURPOSE: A manufacturing method of a synthetic lumber using the same and a composition for manufacturing of a synthetic lumber are provided to increase durability by preventing flame phenomena of synthetic lumber by a near infrared ray. CONSTITUTION: A composition for manufacturing of a synthetic lumber includes a wood dust 35~75 weight%, a polyolefin resin 20~50 weight%, an additive 2~20 weight%. The additive includes a stabilizer including near infrared ray absorber which maximally absorbs 800~1000nm wavelength. The near infrared ray absorber is composed by adding near infrared ray absorption dye in binder solution which dissolves polymethtl methacrylate in NMP(N-methyl-2-pyrrolidone). The near infrared ray absorption dye is at least one selected from a dimmonium compound and a nickel complex.

Description

Composition for synthetic wood and manufacturing method of synthetic wood using same

The present invention relates to a composition for preparing synthetic wood and a method for producing synthetic wood using the same, and more particularly, to a composition for producing synthetic wood and synthetic wood using the same, which can prevent heat deformation even when exposed to the sun for a long time due to increased weather resistance It relates to a manufacturing method of.

In general, natural wood is mainly used as exterior materials or interior materials of buildings such as floorboards, ceiling boards, doors, door frames, windows and fences. The reason why natural wood is mainly used as interior and exterior materials of the building is because the consumer's preference for wood and aesthetics due to natural texture are improved.

However, the interior and exterior materials of the building using the natural wood is a problem of forest damage due to timber felling and environmental damage due to the release of harmful substances in the fire, in particular, the water resistance due to the inherent properties of the wood, Heat resistance, impact strength, flexural strength, dimensional stability, flame retardancy, weather resistance, antibacterial properties are difficult to use as a building exterior material, and the antimicrobial properties of wood are reduced, life is shortened, copper for use to strengthen the antibacterial properties Arsenic, chromium-based antiseptics (called CCA preservatives) are mixed and used.

Therefore, when a fire occurs, toxic substances caused by the combustion of the preservatives of the copper, arsenic, and chromium systems are discharged and are harmful to the human body.

In order to solve the above problems, recently, synthetic wood having a texture and appearance similar to natural wood is widely used as interior and exterior materials of buildings. Synthetic wood is made by extrusion processing a synthetic wood composition, which is a mixture of wood or powdered wood powder powdered by grinding rice such as straw, corn stalks, and pulp, and a resin such as polyvinyl chloride (PVC). Such synthetic wood has improved water resistance, heat resistance, dimensional stability, flame retardancy, and antimicrobial properties, compared to natural wood, and has an effect of reducing manufacturing cost due to low price.

However, synthetic wood has a problem in that when exposed to sunlight when installed outdoors, the weather resistance is lowered, such as thermal deformation, discoloration, photolysis of the resin. To this end, conventional synthetic wood has added a certain amount of ultraviolet absorber to prevent the change of physical properties due to photochemical reaction or light absorption.

Sunlight, or sunlight, is an invisible light that appears outside the short wavelength of visible light and emits ultraviolet and near-infrared light. Ultraviolet rays are called chemical rays because of their strong chemical action, and near-infrared rays are visible rays It is called a hot wire because it has a stronger heat action than ultraviolet rays. Such near-infrared rays rapidly increase the temperature of synthetic wood directly exposed to the sun by thermal action, causing thermal degradation, thereby causing thermal deformation, aging, etc. of synthetic wood, thereby greatly deteriorating physical properties.

Therefore, in the case of using a UV absorber as in the prior art to some extent effective in reducing or preventing discoloration or photochemical reaction of the synthetic wood by absorbing ultraviolet rays contained in sunlight, there is a problem that can not prevent degradation by near infrared rays.

The present invention has been made to improve the above problems, and relates to a composition for producing synthetic wood and a method for producing synthetic wood using the same, which can prevent degradation of synthetic wood due to near infrared rays by blocking not only ultraviolet rays but also near infrared rays.

The composition for preparing synthetic wood of the present invention for achieving the above object contains 35 to 75% by weight of wood powder, 20 to 50% by weight of polyolefin resin, 2 to 20% by weight of additive, and the additive has a maximum absorption wavelength of 800 to 1000 nm. It is characterized by containing the stabilizer containing a phosphorus near-infrared absorber.

The near-infrared absorber is characterized in that the near-infrared absorbing dye is added to a binder solution in which polymethyl methacrylate is dissolved in NMethyl-2-pyrrolidone.

The near-infrared absorbing dye is at least one selected from a dimonium compound and a nickel complex.

And the method for producing a synthetic wood of the present invention for achieving the above object comprises the steps of preparing a near-infrared absorber having a maximum absorption wavelength of 800 to 1000nm; 35 to 75% by weight of wood powder, 20 to 50% by weight of polyolefin resin, 0.2 to 2% by weight of stabilizer containing the near infrared absorber, 1 to 7% by weight of mineral, 0.4 to 6% by weight of coupling agent, 0.4 to 5% by weight of lubricant Mixing the% to form the composition; Molding the composition into a masterbatch in pellet form after melting; Extruding the masterbatch to form a substrate; And polishing the surface of the substrate.

The near-infrared absorbing agent is characterized in that the composition is prepared by adding a near-infrared absorbing dye to a binder in which polymethyl-methacrylate is dissolved in NMethyl-2-pyrrolidone.

Heating the surface of the polished substrate to 120 to 140 ° C. to form a first coating layer in which the polyolefin resin is melted and coated on the surface of the substrate, and a polymethyl-methacrylate on the first coating layer. ) Is applied to the surface of the base material by applying a near infrared absorber formed by adding a near infrared absorbing dye to a binder dissolved in NMethyl-2-pyrrolidone (NMethyl-2-pyrrolidone) to form a second coating layer do.

As described above, according to the present invention, a near-infrared absorber having a maximum absorption wavelength of 800 to 1000 nm is contained in a stabilizer to block near-infrared rays, thereby preventing degradation of synthetic wood by near-infrared rays, thereby greatly increasing durability.

1 to 3 are graphs showing absorption wavelength regions according to types of near-infrared absorbing dyes applied to the present invention.

Hereinafter, a composition for producing synthetic wood according to a preferred embodiment of the present invention will be described in detail.

The composition for producing synthetic wood according to an embodiment of the present invention contains 35 to 75% by weight of wood powder, 20 to 50% by weight of polyolefin resin, and 2 to 20% by weight of additive.

The present invention can produce artificial wood having the same texture as natural wood by using wood flour (sawdust), which is mostly incinerated and left to cause environmental pollution, as a composition for producing synthetic wood.

As the wood powder used as the main component of the present invention, sawdust generated during cutting of branches or stems of trees, preferably tree, can be used. Trees (喬木) refers to a plant with a straight stem, thick stems, and clear distinction between trunks and branches. In the present invention, broad-leaved trees and coniferous trees can be used.

As one example of the broad-leaved arbor tree, birch, maple, oak, oak bark, lacquer, oak, ash, alder, and bark may be used. And, as an example of the conifer tree, cypress, cedar, spherical tree, birches, pine, pine, chopped tree and the like can be used. If the use of the tree as described above may have a useful effect by the various useful materials contained in the tree. In particular, trees are known to emit phytoncide, a directional antibiotic in the air or into the ground, to defend themselves from surrounding pests and microorganisms.

Since coniferous trees are more dense in structure than broadleaf trees, it is preferable to use coniferous trees as wood powder in terms of improving the strength of synthetic wood. Since wood flour contains a large amount of moisture in a natural state, it is preferable to go through a drying process to remove moisture. To this end, the wood flour may be dried to a water content of 2 to 5% by weight between drying.

In addition to the above-mentioned sawdust as wood flour, bamboo flour crushed bamboo, chaff crushed chaff powder, etc. can also be used.

Wood powder is used in the range of 35 to 75% by weight, the strength of the synthetic wood is lowered when the wood powder is less than 35% by weight, and when the content exceeds 75% by weight, the surface of the synthetic wood becomes rough due to excessive wood powder content It is difficult to manufacture high quality synthetic wood.

And wood flour is used that the particle size of 50 to 150 mesh (mesh). If the particle size of the wood powder is less than 50 mesh, the mixing property is lowered. If the particle size of the wood powder is more than 150 mesh, the particle size is too small to reduce the strength.

As the polyolefin resin applied to the present invention, at least one selected from polystyrene, polypropylene, polyethylene, polycarbonate, and polybutadiene may be used. Preferably polypropylene is used. In the present invention, the polyolefin resin is contained in 20 to 50% by weight. If the content of the polyolefin resin is less than 20% by weight impact strength is lowered, if the content exceeds 50% by weight it is difficult to obtain a texture such as natural wood.

The additive in the present invention contains 2 to 20% by weight. An example of the additive is 1 to 7% by weight mineral, 0.4 to 6% by weight coupling agent, 0.4 to 5% by weight lubricant, 0.2 to 2% by weight stabilizer.

It is preferable to use talc as a mineral. Talc increases smoothness and slows down the expansion caused by humidity. The coupling agent facilitates bonding and solidifies the bonding structure when the wood flour and the polyolefin resin are mixed. Maleic anhydride, silane, etc. can be used as a coupling agent. As an example, maleic anhydride is used in an amount of 0.4 to 6% by weight as a coupling agent. If the content of maleic anhydride is less than 0.4% by weight, the increase in strength is insignificant, and if the content is 6% by weight or more, peeling may occur on the surface of the synthetic wood.

Fatty acids such as stearic acid as lubricants in the present invention; Fatty acid amides such as stearic acid amide and oleic acid amide; And waxes such as paraffin wax, polyethylene wax, polypropylene wax, and the like, may be used alone or in combination of two or more, and 0.4 to 5% by weight is used. The lubricating agent smoothes the wood powder so that the wood powder can be pushed out without sticking to the conveying screw during extrusion.

In the present invention, the stabilizer is a substance added to prevent or suppress deterioration of the resin. The resin deteriorates under the influence of heat, light, and oxygen, and thus needs to be prevented. Types of deterioration include thermal deterioration due to heat, photodegradation due to light and oxygen, and oxidative deterioration.

Stabilizers in the present invention include near-infrared absorbers, preferably near-infrared absorbers, ultraviolet absorbers, and antioxidants. Sunlight, the leading cause of deterioration, transfers heat and light to synthetic wood. Near-infrared rays contained in the sun rapidly increase the temperature of synthetic wood by thermal action, causing thermal degradation such as deformation and aging, thereby greatly reducing durability. Ultraviolet rays have a strong chemical effect, causing photodegradation such as discoloration or discoloration of synthetic wood. And oxygen in the air causes oxidation of synthetic wood.

In the present invention, by using a stabilizer containing a near infrared absorber, it is possible to effectively prevent degradation of the synthetic wood exposed to the sun due to thermal action. As the near infrared absorber, a material having a maximum absorption wavelength of 800 to 1000 nm is used.

As a preferred near-infrared absorber, a near-infrared absorbing dye is added to a binder in which polymethyl methacrylate is dissolved in NMethyl-2-pyrrolidone.

As the near-infrared absorbing dye, any one or more selected from dimonium compounds and nickel complexes may be applied. The near-infrared absorbing dye effectively absorbs near-infrared in the region of 700 to 1,500 nm.

As an example of the dimonium compound, a compound represented by the following Formula 1 may be used.

As another example of the dimonium compound, a compound represented by the following formula (2) may be used.

In the above formula, R1 is a C3 to C10 linear or branched alkyl group, R2 is a C1 to C10 linear or branched alkyl group, Z is a dialkylsulfonyl imide in which hydrogen of an alkyl group consisting of C1 to C10 is substituted with a halogen group Is selected from the group consisting of pottery or dialkylsulfonyl imido groups, l is an integer from 1 to 2, m is an integer from 2 to 10. Preferably, in Formula 1, R1 is a C4 to C8 linear alkyl group, R2 is a C1 to C6 linear alkyl group, Z is a trifluoromethylsulfonylimido group.

Compared to the dimonium salt monomer, the diionium salt oligomer has an increased molar extinction coefficient without shifting the maximum absorption wavelength, thereby improving near-infrared absorption ability, high compatibility with binder resin, high thermal stability, and high transmittance at high temperature. Less change and excellent durability.

As an example of a nickel complex, a dithiol-based compound represented by the following Chemical Formula 3 or 4 may be used.

Benzotriazole-based 2- (2'-hydroxy-3'-tert-butyl-5'-methyl-phenyl) -5-chlorobenzotriazol may be used as the UV absorber. And 0.1 to 1% by weight of the phosphate-based antioxidants or calcium stearate may be used as the antioxidant.

In the present invention, the stabilizer is composed of a near-infrared absorber alone or a near-infrared absorber, an ultraviolet absorber, and an antioxidant in a weight ratio of 1: 1: 2. That is, the total weight of the composition is 0.05 to 0.5% by weight of the near infrared absorber, 0.05 to 0.5% by weight of the ultraviolet absorber, and 0.1 to 1.0% by weight of the antioxidant.

And in this invention, a pigment can be used selectively. Pigments use from 0.5 to 10% by weight. Examples of the pigment include inorganic pigments, organic pigments, dyes, and the like. It is preferable to use inorganic pigments because the heat distortion temperature of inorganic pigments is higher than that of organic pigments.

Hereinafter, the manufacturing method of the synthetic timber of this invention is demonstrated.

First, a near infrared absorber is prepared. To this end, a polymethyl methacrylate (polymethyl-methacrylate) is dissolved in NMP (NMethyl-2-pyrrolidone) to prepare a binder solution. Then, any one or more selected from the dimonium compound and the nickel composite is added to the binder solution with a near infrared absorbing dye to uniformly mix to obtain a near infrared absorbent.

Next, 35 to 75% by weight of the prepared wood powder, 20 to 50% by weight of polyolefin resin, 2 to 20% by weight of the additive is mixed to form a composition for producing synthetic wood. At this time, 0.2 to 2% by weight of stabilizer, 1 to 7% by weight of mineral, 0.4 to 6% by weight of coupling agent, and 0.4 to 5% by weight of lubricant are applied.

As a stabilizer, a near infrared absorber may be applied alone. In addition, the stabilizer may be applied by mixing 0.05 to 0.5% by weight of the near infrared absorber, 0.05 to 0.5% by weight of the ultraviolet absorber, 0.1 to 1.0% by weight of the antioxidant in the total weight of the composition.

The composition is molded into a masterbatch in pellet form after melting using a pellet making extruder. And the masterbatch is extruded to a certain shape in an extruder to form a substrate. After extrusion, the substrate is cooled and the surface of the substrate is polished. Sanding may be applied by the polishing process. After polishing the surface to a certain size to prepare a synthetic wood of the present invention.

Of course, the substrate can be prepared by directly extruding the composition while omitting the master batch molding process in the above-described manufacturing method.

As another embodiment of the present invention, after the surface polishing, a first coating layer is formed on the surface of the polished substrate. The surface of the substrate is heated to a temperature of 120 to 140 캜 by passing the substrate through a heating apparatus heated to a constant temperature. At this time, the molten resin film is formed on the surface of the substrate while the polyolefin resin contained in the substrate is melted. The substrate on which the molten resin film is formed is passed through a roller to form a first coating layer having a uniform thickness.

After the first coating layer is cured, a near-infrared absorber is applied on the first coating layer to form a second coating layer. It is the same as mentioned in the composition for producing synthetic wood described above as a near infrared absorber. That is, the near-infrared absorbing agent is formed by adding at least one near-infrared absorbing dye selected from a dimonium compound and a nickel composite to a binder in which polymethyl methacrylate is dissolved in NMP. The near-infrared absorber may be applied on the first coating layer by various methods such as spray spraying or bar coater.

The near-infrared absorber is applied and then dried to finally form a second coating layer. After the formation of the second coating layer to cut the substrate to a predetermined size to produce a synthetic wood. In this way, by applying the near-infrared absorber on the outermost surface of the synthetic wood to form a second coating layer can be effectively prevented from penetrating the near-infrared into the interior of the synthetic wood.

Hereinafter, examples are provided to help understanding of the present invention, but the following examples are merely to illustrate the present invention, and the scope of the present invention is not limited to the following examples.

(Example)

100 mesh particle size 55% by weight of wood powder, 35% by weight of polypropylene, 4% by weight of mineral, 3% by weight of maleic anhydride as coupling agent, 2.4% by weight of polypropylene wax as lubricant, 0.15% by weight of near-infrared absorber, benzoine as ultraviolet absorber Benzotriazole-based 2- (2'-hydroxy-3'-tert-butyl-5'-methyl-phenyl) -5-chlorobenzotriazol 0.15% by weight and 0.3% by weight of calcium stearate as antioxidant It stirred for 10 minutes at a temperature of about 80 degrees to prepare a composition for producing a synthetic wood.

The near-infrared absorber was dissolved in 20 parts by weight of polymethyl methacrylate in NMP to 100 parts by weight of NMPP to form a binder solution, and then 4 parts by weight of near-infrared absorbing dye were added and then mixed uniformly to obtain a near-infrared absorber.

The composition was dried at room temperature after molding a masterbatch in pellet form using a pellet molding extruder. The masterbatch was put into a hopper of a synthetic wood molding extruder to cool the extruded substrate, and then subjected to surface sanding and cutting with a cutter to produce synthetic wood.

Experimental Example: Optical Characteristics

In order to examine the optical properties of the near-infrared absorbing dye applied to the above examples, the compounds of Formulas 1, 3, and 4 were used as the first, second, and third test samples.

In order to investigate the optical characteristics of the applied NIR absorbing dyes, the absorption wavelength ranges of three samples were examined using UV-VIS Spectrophotometer (UV-3150, Shimadzu, Japan). 1 to 3 are shown. In the graph, Dye-A, Dye-B, and Dye-C refer to the first, second, and third test samples, respectively. The maximum absorption wavelength (abs.max) is summarized in Table 1 below.

division Absorption wavelength 1st sample 855 nm 2nd test sample 877 nm Third test sample 922 nm

1 to 3, the wavelength band of the near infrared region of 700 to 1000 nm for the first test sample, the near infrared region of 700 to 1100 nm for the second test sample, and the near infrared region of 750 to 1100 nm for the third test sample It can be seen that the absorption effectively. As shown in Table 1, the maximum absorption wavelength was shown at 855 nm for the first test sample, 877 nm for the second test sample, and 922 nm for the third test sample.

From the above results, the composition of the present invention is expected to be able to increase the durability of the synthetic wood by preventing the near-infrared, in particular, the near-infrared ray of 700 to 1100nm effectively prevent the degradation of the synthetic wood by the thermal action of the near infrared.

In the above, the present invention has been described with reference to one embodiment, which is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent embodiments are possible.

Therefore, the true scope of protection of the present invention should be defined only by the appended claims.

Claims (6)

delete In the composition for producing synthetic wood,
It contains 35 to 75% by weight of wood powder, 20 to 50% by weight of polyolefin resin, 2 to 20% by weight of additive, the additive contains a stabilizer comprising a near infrared absorber having a maximum absorption wavelength of 800 to 1000nm,
The near-infrared absorbing agent is a composition for producing synthetic wood, characterized in that the poly-methyl methacrylate (polymethyl-methacrylate) in a binder solution dissolved in NMP (NMethyl-2-pyrrolidone) by adding a near-infrared absorbing dye. The composition of claim 2, wherein the near-infrared absorbing dye is at least one selected from a dimonium compound and a nickel composite. Preparing a near-infrared absorber having a maximum absorption wavelength of 800 to 1000 nm;
35 to 75% by weight of wood powder, 20 to 50% by weight of polyolefin resin, 0.2 to 2% by weight of stabilizer containing the near infrared absorber, 1 to 7% by weight of mineral, 0.4 to 6% by weight of coupling agent, 0.4 to 5% by weight of lubricant Mixing the% to form the composition;
Molding the composition into a masterbatch in pellet form after melting;
Extruding the masterbatch to form a substrate;
And polishing the surface of the substrate. The method of claim 4, wherein the near-infrared absorbing agent is prepared by adding a near-infrared absorbing dye to a binder in which polymethyl-methacrylate is dissolved in NMethyl-2-pyrrolidone. Way. The method of claim 4, further comprising: heating the polished surface of the substrate to 120 to 140 ° C. to form a first coating layer coated by melting the polyolefin resin on the surface of the substrate,
The near-infrared absorber formed by adding a near-infrared absorbing dye to a binder in which polymethyl-methacrylate was dissolved in NMethyl-2-pyrrolidone on the first coating layer was applied to the surface of the substrate and dried. Method for producing a composite wood, characterized in that it further comprises the step of forming a second coating layer.

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