KR102061126B1 - Wood Plastic Composite with good Strength and weather resistance and Manufacturing method of thereof - Google Patents

Abstract

The present invention relates to a synthetic wood with excellent strength and weather resistance, and a manufacturing method thereof. The synthetic wood comprises: 50-60 wt% of wood flour, 10-20 wt% of a synthetic resin, 1-5 wt% of a carbon fiber, 1-5 wt% of a wood fiber, 1-5 wt% of calcium carbonate, 1-5 wt% of a lubricant, 1-5 wt% of a colorant, 1-5 wt% of a binder, 1-3 wt% of an antioxidant, 0.1-1 wt% of a UV stabilizer and 0.1-1 wt% of a UV absorber. According to the present invention, it is possible to secure excellent weather resistance and antibacterial properties.

Description

Wood and plastic composite with good strength and weather resistance and manufacturing method of

The present invention relates to a synthetic wood having excellent strength and weather resistance, and a method of manufacturing the same. More particularly, the present invention relates to a synthetic wood having excellent strength and weather resistance as well as strength and weather resistance.

Generally, natural wood is mainly used as exterior materials or interior materials of buildings such as floorboards, ceiling boards, doors, door frames, windows, fences, etc., which gives a soft and cozy atmosphere due to the unique materials of wood. Because it is improved.

However, such natural wood is gradually being depleted as the production volume increases, and there is a problem in that inherent physical properties such as water resistance, heat resistance, impact strength, bending load, flame retardancy, and antibacterial property are inferior.

However, the interior and exterior materials of the building using natural wood are deteriorated due to the forest damage due to the timber felling, and the water resistance, heat resistance, impact strength, flexural load, dimensional stability, flame retardancy, weather resistance, and antibacterial properties due to the natural properties of the wood are deteriorated. It is difficult to use as an exterior material, and the life expectancy is shortened due to the deterioration of antimicrobial activity by wood, and the use of copper, arsenic, and chromium-based antiseptics (called CCA preservatives) for the purpose of strengthening the antimicrobial activity is mixed and used. to be.

In order to solve this problem, recently, a synthetic wood having a texture and appearance similar to natural wood has been disclosed. The synthetic wood is a powder obtained by pulverizing fibers such as wood or crests, corn stalks, and pulp, and has excellent processability on the powder. It is made of a mixture of a typical thermoplastic resin polypropylene (PP) resin, polyethylene (PE), ABS resin, and is manufactured and used by extrusion processing.

In order to increase the durability and strength of the synthetic wood, a method of increasing the durability and strength of the synthetic wood is controlled by adjusting the mixing ratio of the wood powder and the additive, or by controlling the heating temperature or the pressure of the wood powder and the additive during the heat compression. .

However, there is a limit to increase the durability and strength in this way, there is a problem that the synthetic wood is easily bent or broken even in a weak impact, and because it contains wood powder, there is a problem of corrosion and decay by bacteria because of the antimicrobial properties. .

In addition, when synthetic wood is used as flooring, the design for preventing slip is important. In particular, in the case of synthetic wood installed outdoors, such as stairs of hiking trails and hiking trails, the sliding accident prevention function is important because there is a lot of factors that can cause high humidity, such as rain, snow.

Conventionally, in order to prevent slipping, the surface of the synthetic wood has been formed with irregularities or grooves in the longitudinal direction to give a slip prevention function, but this surface processing method has an anti-slip effect at the beginning of installation, but many people step on When passing by, the surface quickly wears out and loses its anti-slip function.

Republic of Korea Patent Publication No. 10-1111386 (2012.02.13.) Discloses an eco-friendly synthetic wood and a method of manufacturing the same with enhanced properties and durability.

The eco-friendly synthetic wood is more than 50% of the content of the wood powder, while the bending load is increased, it is possible to manufacture a synthetic wood that gives a more eco-friendly and close to natural wood, there is an excellent anti-slip performance, but weather resistance and antibacterial There are inadequate disadvantages.

KR 10-1111386 B1 2012.02.13.

It is an object of the present invention to provide a composite wood having excellent strength and weather resistance, as well as strength and weather resistance and antibacterial properties, and a method of manufacturing the same.

In order to achieve the above object, the present invention provides the following means.

The present invention, 50 to 60% by weight of wood powder, 10 to 20% by weight of synthetic resin, 1 to 5% by weight of carbon fiber, 1 to 5% by weight of wood fiber, 1 to 5% by weight of calcium carbonate, 1 to 5% by weight of lubricant, colorant 1 It provides a composite wood excellent in strength and weather resistance, comprising-5% by weight, 1-5% by binder, 1-3% by weight antioxidant, 0.1-1% by weight UV stabilizer and 0.1-1% by weight UV absorber.

In addition to the strength and weathering resistance 100 parts by weight of the synthetic wood 1 to 5 parts by weight of additional strength enhancer, the strength enhancer 40-50% by weight epoxy modified acrylic copolymer, 40-50% by weight phenol-modified rosin ester resin, thermoplastic 1 to 5% by weight of polyurethane resin, and 1 to 5% by weight of ethylene vinyl acetate copolymer.

Further comprising 1 to 5 parts by weight of the anti-strain enhancer based on 100 parts by weight of the synthetic wood having excellent strength and weather resistance, wherein the anti-strain enhancer includes 70 to 80% by weight of acrylonitrile-butadiene rubber and 20 to 30% by weight of chloroprene rubber do.

1 to 5 parts by weight of antimicrobial enhancers are additionally included with respect to 100 parts by weight of synthetic wood having excellent strength and weather resistance, wherein the antimicrobial enhancers include 40 to 60% by weight of mica, 20 to 40% by weight of dolomite and 10 to 30% by weight of zeolite. .

1 to 5 parts by weight of the deodorizing performance enhancer is added to 100 parts by weight of the synthetic wood having excellent strength and weather resistance, wherein the deodorizing performance enhancing agent includes 80% by weight of red shale and 20% by weight of the microbial mixture, and the microbial mixture is water 80 ˜90% by weight, 5-15% by weight of microbial freeze and 1-10% by weight of rice bran, wherein the microbial freeze is 100 parts by weight of water Bacillus subtilis , Bacillus megaterium 30-40 parts by weight of one or more strains selected from the group consisting of Bacillus coagulance and 20-25 parts by weight of sugar and maintained at 20-25 ° C. for 3 days and then lyophilized.

In addition, the present invention, 50 to 60% by weight of wood powder, 10 to 20% by weight of synthetic resin, 1 to 5% by weight of carbon fiber, 1 to 5% by weight of wood fiber, 1 to 5% by weight of calcium carbonate, 1 to 5% by weight of lubricant, 1 to 5% by weight of colorant, 1 to 5% by weight of binder, 1 to 3% by weight of antioxidant, 0.1 to 1% by weight of UV stabilizer and 0.1 to 1% by weight of UV absorber to make synthetic wood composition (Step 1) ; Putting the synthetic wood composition into a first extruder and extruding to produce pellets (step 2); And extruding the pellet by injecting the pellet into a second extruder (step 3); It provides a method of producing a synthetic wood, including strength and weather resistance excellent.

After the step 1 comprising 1 to 5 parts by weight of strength enhancer, 1 to 5 parts by weight of anti-strain enhancer, 1 to 5 parts by weight of antimicrobial enhancer and 1 to 5 parts by weight of deodorant performance enhancer based on 100 parts by weight of the synthetic wood composition In addition, the strength enhancer 40 to 50% by weight epoxy modified acrylic copolymer, 40 to 50% by weight phenol-modified rosin ester resin, 1 to 5% by weight thermoplastic polyurethane resin, and 1 to 5% by weight ethylene vinyl acetate copolymer %, Wherein the anti-strain enhancer 70 to 80% by weight of acrylonitrile-butadiene rubber and 20 to 30% by weight of chloroprene rubber, the antimicrobial enhancer 40 to 60% by weight of mica, 20 to 40% by weight of dolomite And 10 to 30% by weight of zeolite, wherein the deodorizing performance enhancing agent includes 80% by weight of red shale and 20% by weight of microbial mixture, and the microbial mixture is 80 to 90% by weight of water and 5 to 15% by weight of microbial condensate. And rice bran 1-10% by weight It said, the microorganism frozen material is water to 100 parts by weight of Bacillus subtilis (Bacillus subtilis), Bacillus MEGATHERIUM (Bacillus megaterium) and Bacillus core tangerine lance (Bacillus coagulance) strain one selected from the group at least consisting of 30 to 40 wt. 20-25 parts by weight of parts and sugars are mixed and maintained at 20-25 ° C. for 3 days and then lyophilized.

Synthetic wood having excellent strength and weather resistance according to the present invention has the advantage of excellent weather resistance and antibacterial property as well as strength.

In addition, the synthetic wood excellent in strength and weather resistance according to the present invention has the advantage that can inhibit the phenomenon of the synthetic wood contaminated with fungal bacteria, discoloration and cracking after a certain time after construction.

Hereinafter, the present invention will be described in detail.

First, the synthetic wood excellent in strength and weather resistance according to the present invention.

Synthetic wood excellent in strength and weather resistance of the present invention,

50 to 60 wt% wood flour, 10 to 20 wt% synthetic resin, 1 to 5 wt% carbon fiber, 1 to 5 wt% wood fiber, 1 to 5 wt% calcium carbonate, 1 to 5 wt% lubricant, 1 to 5 wt% colorant , 1 to 5 wt% binder, 1-3 wt% antioxidant, 0.1 to 1 wt% UV stabilizer and 0.1 to 1 wt% UV absorber.

If the wood powder is included in less than 50% by weight it is difficult to provide the appearance and texture corresponding to the natural wood, and when included in more than 60% by weight there is a problem that can not produce a high-quality synthetic wood due to the separation of the wood powder.

The wood flour is finely pulverized coniferous wood such as pine having a relatively dense fibrous structure to the size of 100 ~ 150 mesh (Mesh) in the grinder to produce wood powder (wood powder), wherein the size of the wood powder is 100 mesh If it is less than (Mesh), the size of the wood powder itself is too large, the dimensional stability, elastic modulus, etc. of the synthetic wood itself is lowered, and if the size of the wood powder is more than 150 mesh (mesh), it is due to the finely ground wood powder Phenomenon such as agglomeration of wood powder is frequently generated during the compounding process to be blended, and is difficult to blend with polyethylene resin.

The wood powder pulverized as described above is put into a dryer and heated to a temperature of 90 to 130 ° C., thereby performing a drying process such that the moisture content in the wood powder is 2 to 4 wt%, and the drying temperature of the wood powder is 90 ° C. In the following, it takes a long time to dry, and when the drying temperature is higher than 130 ° C., the dense tissue of the wood powder itself is warped due to the rapid drying, wherein the moisture content of the wood powder is dried to be 2 to 4% by weight. However, if the moisture content of the wood flour is less than 2% by weight, there is a problem that can not be smoothly mixed with the polyethylene resin, if the moisture content is more than 4% by weight, during the production of synthetic wood, the moisture inside the wood powder is evaporated Occurrence of bubbles, such as polyethylene resin, greatly weakens the bonding force during the mixing, there is a problem that a defective product occurs.

The synthetic resin may be polypropylene (PP), polyethylene (polyethylene, PE), a copolymer thereof, or a mixture of these polymers, and preferably, a mixture of polypropylene and polyethylene may be used. When mixing polypropylene and polyethylene, the polyethylene may be 50 to 130 parts by weight based on 100 parts by weight of the polypropylene.

The polyethylene may be an ethylene polymer such as high density polyethylene (HDPE), low density polyethylene (LDPE) or linear low density polyethylene (LLDPE).

The synthetic resin can be produced in a high strength synthetic wood strong against external impacts compared to other resins.

If the synthetic resin is contained less than 10% by weight, there is a problem that the physical properties and moldability is lowered, and when included in more than 20% by weight there is a problem that the texture such as natural wood can not be obtained.

The carbon fiber increases the bonding strength with the main components of the synthetic wood by the fibrous structure of the carbon fiber to obtain a good bending load while containing a large amount of inorganic materials such as natural minerals, and through the silane coupling agent synthetic wood The binding force with the main components of the is further increased.

Carbon fiber is prepared by mixing a small amount of additives (antibacterial agent, mineral powder, etc.) with the thermosetting resin powder to prepare a raw material mixture, and preparing the prepared raw material mixture in fibrous form.

Thermosetting resin powder is a carbon source of carbon fibers and is a raw material carbonized by a carbonization process into an activated carbon fiber. It is preferable that all common carbon compounds can be used, but in particular, those that can minimize the stability of the process and the impurity content in the obtained carbon fibers are preferably used. Alternatively, the carbon dioxide is not deformed during carbonization and has a small impurity content. For example, a novolac phenol resin may be used. It can be easily understood by those skilled in the art that various kinds of thermosetting resins can be used in addition to the phenol resin, and the thermosetting resins described above are known to be commercially available. Can be.

Fiber formation consists of preparing a raw material mixture in a fibrous form, heat curing and carbonizing in an inert atmosphere to produce carbon fibers. The production of the raw material mixture in fibrous form is the same as or similar to that of a conventional fiber manufacturing process. It is very easy to understand.

Spinning into fibrous form can be achieved by spinning the raw material mixture through a nozzle of a diameter of about 1.0 mm at a spinning temperature of about 250 ° C.

When the carbon fiber is less than 1% by weight, the strength of the synthetic wood is lowered. When the carbon fiber is included by more than 5% by weight, the strength is improved, but the effect of improving the performance is somewhat insignificant compared to the added amount, and the elastic force of the synthetic wood is lowered. .

If the content of the wood fiber is used in an amount of less than 1% by weight may be difficult to strengthen the strength, when used in an amount of more than 5% by weight there is a fear of discoloration, mold growth of synthetic wood.

The wood fiber has a length of 7 to 9 mm. Wood fiber has a smaller surface area than wood flour, thereby reducing its load rate during extrusion, thereby improving productivity.

The calcium carbonate is preferably contained 1 to 5% by weight, if less than 1% by weight of flexural strength, bending creep deformation suppression, thermal dimensional stability, flame retardant performance is bad, and when included more than 5 parts by weight impact strength Has a problem of getting worse. The calcium carbonate is preferably used having a particle size of 1.2 ~ 1.6㎛.

The lubricant (lubricant) can be added to increase the dispersion of wood powder and wood fiber during the processing of synthetic wood, the surface properties of the synthetic wood can be improved to prevent slipping.

Specifically, the lubricant may be ethylene bis-stearamide (ethylene bis-stearamide, EBS), zinc stearamide (zinc stearate), paraffin wax or oxidized polyethylene (oxidized polyethylene), can be used alone or in combination of two or more kinds have.

The colorant is used to impart color stability and is used to enhance the appearance of wood and resistance to ultraviolet rays. In the present invention, the type of the coloring agent is not limited, and for example, a pigment composed of iron oxide, which is inorganic, may be used.

This is because when the colorant is included in less than 1% by weight, the function as a colorant is weak to prevent discoloration from wood, and when included in an amount of more than 5% by weight, the colorant may be excessive to reduce the physical properties of the synthetic wood.

The binder is used to improve the binding force between the synthetic resin and wood flour. In principle, wood flour has a hydrophilic polarity, and synthetic resin has a hydrophobic nonpolarity, so that the binding strength of the two materials is weak. Thus, the interaction of wood flour and resin is greatly improved with new chemical bonds at the interface between the two materials by the addition of a binder. As the binder, maleated polypropylene (MAPP) may be used. The binder increases the modulus of rupture (MOR) and modulus of elasticity (MOE) of the synthetic wood, and helps dimensional stability, impact strength and wood powder dispersion.

If the binder is included in less than 1% by weight can not improve the binding force, when included in excess of 5% by weight may be excessive to reduce the properties of the synthetic wood.

The antioxidant prevents deterioration of coloring and mechanical strength by deterioration due to oxygen action in the air during the manufacturing, processing, storage and use of synthetic wood. Specifically, a free radical scavenger which is a hydroperoxide decomposer and a phenol resin serving as a phosphite may be used.

The UV stabilizer prevents the synthetic wood from deteriorating or discoloring by protecting the synthetic wood by blocking ultraviolet rays from sunlight. Specifically, the UV stabilizer may be an organic compound such as a hindered amine light stabilizer (HALS) that is a radical scavenger and a hydroperoxide decomposer.

As the ultraviolet absorber, a benzotriazole type may be used. Specifically, 2- (2'-hydroxy-3'-tert-butyl-5'-methyl-phenyl) -5-chlorobenzotriazole may be used. Can be.

Synthetic wood excellent in strength and weather resistance of the present invention,

It may further include 1 to 5 parts by weight of strength enhancer based on 100 parts by weight of synthetic wood having excellent strength and weather resistance.

The strength enhancer includes 40 to 50% by weight epoxy modified acrylic copolymer, 40 to 50% by weight phenol-modified rosin ester resin, 1 to 5% by weight thermoplastic polyurethane resin, and 1 to 5% by weight ethylene vinyl acetate copolymer. .

The epoxy modified acrylic copolymer is an epoxy modified acrylic copolymer having a hydroxyl group and a carboxyl group by introducing an epoxy group to an acrylic resin to enhance the strength of the synthetic wood. Since the epoxy modified acrylic copolymer has an appropriate amount of hydroxyl and carboxyl groups, it has excellent adhesion to wood flour and wood fibers. In addition, it is excellent in water resistance, chemical resistance and durability. If the epoxy-modified acrylic copolymer is included less than 40% by weight, there is a problem in that the adhesion strength with wood powder and wood fibers are inferior, and when more than 50% by weight is included there is a problem inferior in wear resistance.

The phenol-modified rosin ester resin is included to improve adhesion and wettability with the adhesive. When the phenol-modified rosin ester resin is included in less than 40% by weight, there is a problem in that the improvement of the melt viscosity and the wettability is insufficient, and when it is included in the amount of more than 50% by weight, cracking occurs.

The thermoplastic polyurethane resin has advantages of excellent heat resistance, cold resistance, low glass transition point, and high mechanical strength. If the thermoplastic polyurethane resin is contained less than 1% by weight, there is a problem that the heat resistance is poor, and when included in more than 5% by weight there is a problem that the hardness of the synthetic wood falls.

The ethylene vinyl acetate copolymer has excellent physical properties at low temperatures, excellent flexibility, excellent compatibility with other resins, easy to mix and use, and excellent adhesion. It is preferable that the content rate of vinyl acetate is 40-45 weight% in an ethylene vinyl acetate copolymer, and its softening point is 80-85 degreeC. When the ethylene vinyl acetate copolymer is included in less than 1% by weight, the impact resistance is inferior, and when included in more than 5% by weight, there is a problem in that the pressing phenomenon due to the continuous load is high.

Synthetic wood excellent in strength and weather resistance of the present invention,

It may further include 1 to 5 parts by weight of the anti-strain enhancer based on 100 parts by weight of the synthetic wood having excellent strength and weather resistance.

The anti-strain enhancer includes 70 to 80% by weight of acrylonitrile-butadiene rubber and 20 to 30% by weight of chloroprene rubber.

It is preferable that 1 to 5 parts by weight of the anti-strain enhancer is included in 100 parts by weight of the synthetic wood having excellent strength and weather resistance. If the content of the anti-strain enhancer is less than 1 part by weight, there is a problem that the anti-strain effect is insufficient, 5 parts by weight. If it exceeds, there is a problem that the hardness of the synthetic wood is bad.

Synthetic wood excellent in strength and weather resistance of the present invention,

It may further include 1 to 5 parts by weight of antimicrobial enhancer based on 100 parts by weight of synthetic wood having excellent strength and weather resistance.

The antimicrobial enhancer 40 to 60% by weight of the mica, dolomite 20 to 40% by weight and zeolite 10 to 30% by weight.

The sericite is iron (Fe), magnesium (Mg), zinc (Zn), manganese (Mn), copper (Cu), molybdenum (Mo), selenium (Se), germanium (Ge), silicon (Si) As a clay mineral containing various human essential minerals such as vanadium (V) and strontium (Sr), it is a mica-based mineral used for the decomposition of active oxygen with strong reducing power, and is a bioactive substance and has a sterilizing effect.

The biotite is in the form of a healthy plate, belongs to the monoclinic system, and has a white or off-white pearl luster. The chemical composition is almost the same as that of the mica, but generally potassium is less and more watery than the mica. The biotite is used as a mixing material of ceramics or firebrick, and also has various uses such as paints, electrical insulators, active materials, and cosmetics. Since the mica is used by foaming and powdering, an air layer is formed inside the powder to control humidity, as well as to prevent deodorization or mold generation.

In addition, the biotite may be heat treated in the range of 1250 to 1350 ° C. to increase the strength before being powdered. In this case, when the heating temperature of the heat treatment is less than 1250 ° C., the villi may not obtain an appropriate strength, and when the heating temperature is 1350 ° C. or more, the villi may be lost.

In addition, the heat treated biotite may be powdered to a particle size of 500 to 1000 mesh (mesh) to be uniformly mixed prior to mixing with the wallpaper composition. In the present invention, if the chorionic pulverized more than 1000 mesh (mesh), there is a problem that cracks occur in the coating layer formed by applying the wallpaper composition to the structure surface, which is powdered to less than 500 mesh (mesh) In this case, the surface condition of the wallpaper coating layer may be rough.

In the present invention, dolomite may be used to further enhance the antibacterial and antifungal properties. The dolomite is more preferably used powder in the range of 300 to 400 mesh.

Since the zeolite has a number of pores (Pore) is excellent in sterilization with the effect of adsorbing and killing harmful bacteria (Bacteria), organic compounds (Organic compound) and the like.

Synthetic wood excellent in strength and weather resistance of the present invention,

It may further include 1 to 5 parts by weight of the deodorizing performance enhancer based on 100 parts by weight of synthetic wood having excellent strength and weather resistance.

The deodorant enhancer includes 80% by weight of red shale and 20% by weight of microbial mixture.

The microbial mixed solution contains 80 to 90% by weight of water, 5 to 15% by weight of microbial freeze and 1 to 10% by weight of rice bran,

The microbial freeze is 30 to 40 parts by weight of one or more strains selected from the group consisting of Bacillus subtilis , Bacillus megaterium and Bacillus coagulance in 100 parts by weight of water and 20-25 parts by weight of sugar is mixed and maintained at 20-25 ° C. for 3 days and then lyophilized.

Synthetic wood having excellent strength and weather resistance according to the present invention has the advantage of excellent weather resistance and antibacterial property as well as strength.

In addition, the synthetic wood excellent in strength and weather resistance according to the present invention has the advantage that can inhibit the phenomenon of the synthetic wood contaminated with fungal bacteria, discoloration and cracking after a certain time after construction.

Next, a method for producing a synthetic wood excellent in strength and weather resistance according to the present invention.

Method for producing a synthetic wood excellent in strength and weather resistance of the present invention,

50 to 60 wt% wood flour, 10 to 20 wt% synthetic resin, 1 to 5 wt% carbon fiber, 1 to 5 wt% wood fiber, 1 to 5 wt% calcium carbonate, 1 to 5 wt% lubricant, 1 to 5 wt% colorant Preparing a synthetic wood composition by mixing 1-5 wt% of binder, 1-3 wt% of antioxidant, 0.1-1 wt% of UV stabilizer and 0.1-1 wt% of UV absorber (step 1);

Putting the synthetic wood composition into a first extruder and extruding to produce pellets (step 2); And

Injection molding the pellets into a second extruder (step 3);

It includes.

After the step 1 comprising 1 to 5 parts by weight of strength enhancer, 1 to 5 parts by weight of anti-strain enhancer, 1 to 5 parts by weight of antimicrobial enhancer and 1 to 5 parts by weight of deodorant performance enhancer based on 100 parts by weight of the synthetic wood composition May be added.

The strength enhancer includes 40 to 50% by weight epoxy modified acrylic copolymer, 40 to 50% by weight phenol-modified rosin ester resin, 1 to 5% by weight thermoplastic polyurethane resin, and 1 to 5% by weight ethylene vinyl acetate copolymer. .

The anti-strain enhancer includes 70 to 80% by weight of acrylonitrile-butadiene rubber and 20 to 30% by weight of chloroprene rubber.

The antimicrobial enhancer 40 to 60% by weight of the mica, dolomite 20 to 40% by weight and zeolite 10 to 30% by weight.

The deodorant enhancer includes 80% by weight of red shale and 20% by weight of microbial mixture.

The microbial mixed solution contains 80 to 90% by weight of water, 5 to 15% by weight of microbial freeze and 1 to 10% by weight of rice bran,

The microbial freeze is 30 to 40 parts by weight of one or more strains selected from the group consisting of Bacillus subtilis , Bacillus megaterium and Bacillus coagulance in 100 parts by weight of water and 20-25 parts by weight of sugar is mixed and maintained at 20-25 ° C. for 3 days and then lyophilized.

Step 2 is a step of preparing a pellet by putting the synthetic wood composition into a first extruder and extruding. The temperature of the first extruder barrel is preferably 180 ~ 190 ℃, screw speed is 100 ~ 150rpm. The synthetic wood composition kneaded in the extruder is air cooled to produce pellets using a pellet maker.

Step 3 is a step of extruding the pellet by injecting the pellet into a second extruder. It is preferable that the temperature of the cylinder of the extruder is 160 to 245 ° C, and the die temperature is 155 to 165 ° C.

Hereinafter, the configuration and effects of the present invention through the embodiments will be described in more detail. These examples are only for illustrating the present invention, but the scope of the present invention is not limited by these examples.

52% by weight of wood powder, 20% by weight of synthetic resin, 5% by weight of carbon fiber, 5% by weight of wood fiber, 5% by weight of calcium carbonate, 3% by weight of lubricant, 2% by weight of colorant, 5% by weight of binder, 1% by weight of antioxidant, UV stabilizer 1% by weight and 1% by weight of the ultraviolet absorbent was mixed to make a synthetic wood composition. The wood flour (Wood Flour) was produced by finely grinding the wood solid pine wood to the size of 100 mesh (Mesh) in the grinder. The wood powder pulverized as described above was put into a dryer and heated to a temperature of 110 ° C., and a drying process was performed such that the moisture content in the wood flour was 3% by weight. The synthetic resin was mixed with 70 parts by weight of high density polyethylene (HDPE) based on 100 parts by weight of polypropylene. The polypropylene (melt index = 2 g / 10 min., Density = 0.91 g / cm 3) and HDPE (melt index = 2.8 g / 10 min., Density = 0.96 g / cm 3) were used and supplied by Daehan Oil. The wood fibers used were 7-9 mm in length. As the calcium carbonate, hard calcium carbonate (pH 9.0 to 10.0) having a particle size of 1.2 to 1.6 μm was purchased from POSCO Chemtech. The lubricant was used ethylene bis-stearamide (EBS). The binder was maleated polypropylene (MAPP). The antioxidant used a phosphate-based antioxidant. The colorant used was iron oxide pigment of the benefit company. The UV stabilizer was used Tinuvin XT855 from Basf. The ultraviolet absorber used 2- (2'-hydroxy-3'-tert-butyl-5'-methyl-phenyl) -5-chlorobenzotriazole. The synthetic wood composition was introduced into a first extruder and extruded to prepare pellets. The temperature of the said 1st extruder barrel was 180-190 degreeC, and the screw speed was 100-150 rpm. After drying the pellet at 100 ° C. for 5 hours, the pellet was injected into a second extruder, and the temperature of the cylinder of the second extruder was 160 to 245 ° C., and the die temperature was 155 to 165 ° C. Extrusion was performed under the conditions to prepare a synthetic wood excellent in strength and weatherability.

5 parts by weight of strength enhancer, 5 parts by weight of anti-strain enhancer, 5 parts by weight of antibacterial enhancer and 5 parts by weight of deodorizing performance enhancer were added to 100 parts by weight of the synthetic wood having excellent strength and weather resistance prepared in Example 1. The strength enhancer was mixed with 45% by weight epoxy-modified acrylic copolymer, 45% by weight phenol-modified rosin ester resin, 5% by weight thermoplastic polyurethane resin, and 5% by weight ethylene vinyl acetate copolymer. The anti-strain enhancer mixed 75% by weight of acrylonitrile-butadiene rubber and 25% by weight of chloroprene rubber. The antimicrobial enhancer was mixed 50% by weight mica, 30% by weight dolomite and 20% by weight zeolite. The deodorizing performance enhancer was mixed with 80% by weight of the red shale and 20% by weight of the microbial mixture. The microbial mixture was mixed with 80% by weight of water, 15% by weight of microorganisms and 5% by weight of rice bran. The microbial freeze was mixed with 100 parts by weight of water and 40 parts by weight of Bacillus subtilis and 25 parts by weight of sugar and maintained at 25 ° C. for 3 days and then lyophilized.

Comparative Example 1

55% by weight of dried wood powder, 35% by weight of thermoplastic resin, 3% by weight of resin-based oil additives, 2% by weight of carbon fiber, 5% by weight of additives at 200 ℃ and extruded mixed dough to produce a molded synthetic wood It was.

Experimental Example 1

The maximum flexural loads of the composite woods of Examples 1, 2 and Comparative Example 1 were tested according to the GR F 2016: 2011 test method, and the results are shown in Table 1.

Identification item Test result Test Methods Bending load (N) Example 1 5100 GR F 2016:
2011 Example 2 5400 Comparative Example 1 3800

According to Table 1, it turns out that the synthetic wood of Example 1, 2 is excellent in the maximum bending load compared with the synthetic wood of the comparative example 1.

Experimental Example 2

The flexural modulus of the synthetic wood of Examples 1, 2 and Comparative Example 1 was tested according to ASTM D790 test method, and the results are shown in Table 2.

Identification item Test result Test Methods Flexural modulus (㎏ / ㎠) Example 1 55,600 ASTM D790 Example 2 56,800 Comparative Example 1 55,100

According to Table 2, it turns out that the synthetic wood of Example 1, 2 is excellent in flexural modulus compared with the synthetic wood of the comparative example 1.

Comparative Example 2

100 g of 60 mesh spruce wood, 80 g polypropylene, 5 g calcium carbonate, 5 g glycerin fatty acid ester, 5 g MAPP, 2.5 g alkyl-4-silylheterocyclic phenol as antioxidant, 2.5 g non-yellowing polyurea resin, SPB 2.5 g, melamine cyanurate 2.5g, and 2.5g iron oxide were mixed to prepare a synthetic wood composition.

Experimental Example 3

Flexural creep deformation and impact strength of the synthetic wood of Examples 1, 2 and Comparative Example 2 were measured, and the results are shown in Table 3.

Flexural creep strain (%) Impact strength (kJ / ㎡) Example 1 0.06 4.3 Example 2 0.04 5.0 Comparative Example 2 0.07 3.2

According to Table 3, the synthetic wood of Examples 1 and 2 had a lower flexural creep deformation and superior impact strength than the synthetic wood of Comparative Example 2.

Comparative Example 3

59 wt% of the wood flour composition, 25 wt% of the raw material composition, 6 wt% of the reinforcing agent, 3 wt% of the lubricant, 4 wt% of the colorant, and 3 wt% of the binder were mixed. As the wood powder composition, a mixture of 0.5 parts by weight of a UV absorber to 100 parts by weight of wood powder was used, and 0.5 parts by weight of a UV stabilizer was mixed into 100 parts by weight of PP, which is a thermoplastic resin. At this time, the wood powder is a coniferous wood powder having a fiber length of 1.0 ~ 1.5mm, the size of 40 ~ 80 mesh, the ratio of length to diameter of 3: 1 to 5: 1, and used dry wood powder having a moisture content of 2%. As the UV absorber, 2- (2-hydroxy-5-methylphenyl) benzotriazole was used, and an amine stabilizer was used as the UV stabilizer. In addition, as a reinforcing agent, a mixture of titanium dioxide and calcium carbonate in a 1: 1 weight ratio was used, and as a lubricant, alumina silicate was used as a main component, and fine hollow powder of ceramics having a particle size of 30 to 100 μm was used. Used a pigment composed of iron oxide, and maleated polypropylene as a binder. In addition, the reinforcing agent, the lubricant, the colorant prepared a master batch in the form of pellets using the raw material composition, and then mixed it with a pellet-type composition mixed with the wood powder composition, the raw material composition and the binder, the mixture is 200 ~ 260 ℃ After heating and stirring for 30 minutes, it was put in an extruder and extruded to produce a continuous plate-like synthetic wood. After cooling the synthetic wood, the surface was smoothly processed.

Experimental Example 4

Length linear thermal expansion coefficient (1 / degreeC) was measured about the synthetic wood of Example 1, 2, and the comparative example 3, and the result is shown in Table 4. The linear thermal expansion coefficient was measured according to the linear thermal expansion coefficient measuring method of KS M 3060 plastic.

division Length coefficient of thermal expansion (1 / ℃) Example 1 1.3 × 10 ^-5 Example 2 1.0 × 10 ^-5 Comparative Example 3 1.5 × 10 ^-5

According to Table 4, it can be seen that the synthetic wood of Examples 1 and 2 has an effect of improving weather resistance, that is, thermal stability due to climate change, compared to the synthetic wood of Comparative Example 3.

[Comparative Example 4]

50 parts by weight of an organic silane was added to 100 parts by weight of a colloidal liquid (solid content: water = 30:70) obtained by dispersing a natural wood pulverized product in water. In this case, methyltrimethoxysilane was used as the reaction time. Silver was adjusted to 6 hours at room temperature and stirred at 700 ~ 800rpm to form a sol (sol), the temperature of the reactor was raised to 80 ℃ to react for 3 hours to obtain a wood powder surface treated with an organic group. 100 parts by weight of polypropylene having a number average molecular weight of 5,000, 70 parts by weight of silane-treated wood powder prepared above, 3 parts by weight of liquid isoprene rubber (number average molecular weight 20,000, acid value 20), 1.0 part by weight of phosphate-based antioxidant, 1.0 part by weight of a UV stabilizer (bis 2,2,6,6-tetramethyl-4-piperidyl), 1.0 part by weight of a zeolite-based antifungal agent containing 5% by weight of silver and zinc and a flame retardant (aluminum hydroxide) ) 30 parts by weight was added and uniformly mixed using a twin screw extruder to obtain a mixture. The obtained mixture was cast in a mold to a thickness of 10 mm to form a sheet and aged at room temperature for 24 hours to obtain a synthetic wood.

Experimental Example 5

The physical properties of the synthetic woods of Examples 1, 2 and Comparative Example 4 were evaluated, and the results are shown in Table 5.

Example 1 Example 2 Comparative Example 4 Water absorption % 1.2 1.0 1.3 importance - 1.230 1.233 1.235 Accelerated Weathering Test % 98 99 92

According to Table 5, it can be seen that the synthetic wood of Examples 1 and 2 showed superior results compared to Comparative Example 4 in the water absorption rate and the weatherability test as a criterion for evaluating the water resistance compared to the synthetic wood of Comparative Example 4 have.

[Comparative Example 5]

30 parts by weight of cypress, 30 parts by weight of waste wood, 26 parts by weight of polyethylene (LG Chem, BF511) as synthetic resin, 5 parts by weight of fly ash (Gum-Ryun, Geum-Lyun MEGAMX-1000), Lime powder White light material, stone powder) 3 parts by weight, composite lubricant (Struktol, TPW104) 3 parts by weight, UV protective agent (Ciba Geigy, Chimassorb 944) 0.8 parts by weight, 2.2 parts by weight of colorant (Yuiksa, iron oxide pigment) at 150 ℃ with a blending kneader After mixing, the mixture was put into a hopper of a synthetic wood molding extruder and extruded to prepare a 5 cm thick plate-wood composite specimen.

Experimental Example 6

The degree of antimicrobial activity of the synthetic wood of Example 2 and Comparative Example 5 was measured, and the results are shown in Table 6.

Antibacterial (Bacterial Reduction Rate) Example 2 82.4% Comparative Example 5 49.5% Antimicrobial activity of Escherichia coli ATCC 25922 using E. coli
Bacterial reduction rate after 2 hours

According to Table 6, it can be confirmed that the synthetic wood of Example 2 has an excellent antibacterial effect compared to Comparative Example 5.

Claims (7)

50 to 60 wt% wood flour, 10 to 20 wt% synthetic resin, 1 to 5 wt% carbon fiber, 1 to 5 wt% wood fiber, 1 to 5 wt% calcium carbonate, 1 to 5 wt% lubricant, 1 to 5 wt% colorant 1 to 5 parts by weight of strength enhancer based on 100 parts by weight of a composite wood composition comprising 1 to 5% by weight of binder, 1 to 3% by weight of antioxidant, 0.1 to 1% by weight of UV stabilizer and 0.1 to 1% by weight of UV absorber, 1 to 5 parts by weight of anti-strain enhancer, 1 to 5 parts by weight of antibacterial enhancer and 1 to 5 parts by weight of deodorizing performance enhancer,
The strength enhancer comprises 40 to 50% by weight epoxy modified acrylic copolymer, 40 to 50% by weight phenol-modified rosin ester resin, 1 to 5% by weight thermoplastic polyurethane resin, and 1 to 5% by weight ethylene vinyl acetate copolymer ,
The anti-strain enhancer comprises 70 to 80% by weight of acrylonitrile-butadiene rubber and 20 to 30% by weight of chloroprene rubber,
The antimicrobial enhancer 40 to 60% by weight of the mica, dolomite 20 to 40% by weight and zeolite 10 to 30% by weight,
The deodorizing performance enhancing agent includes 80% by weight of red shale and 20% by weight of microbial mixture,
The microbial mixed solution contains 80 to 90% by weight of water, 5 to 15% by weight of microbial freeze and 1 to 10% by weight of rice bran,
The microbial freeze is 30 to 40 parts by weight of one or more strains selected from the group consisting of Bacillus subtilis , Bacillus megaterium and Bacillus coagulance in 100 parts by weight of water and 20-25 parts by weight of sugar is mixed and maintained at 20-25 ° C. for 3 days and then lyophilized.
Synthetic wood with excellent strength and weather resistance.
delete delete delete delete 50 to 60 wt% wood flour, 10 to 20 wt% synthetic resin, 1 to 5 wt% carbon fiber, 1 to 5 wt% wood fiber, 1 to 5 wt% calcium carbonate, 1 to 5 wt% lubricant, 1 to 5 wt% colorant Preparing a synthetic wood composition by mixing 1-5 wt% of binder, 1-3 wt% of antioxidant, 0.1-1 wt% of UV stabilizer and 0.1-1 wt% of UV absorber (step 1);
Putting the synthetic wood composition into a first extruder and extruding to produce pellets (step 2); And
Injection molding the pellets into a second extruder (step 3);
Including,
After the step 1 comprising 1 to 5 parts by weight of strength enhancer, 1 to 5 parts by weight of anti-strain enhancer, 1 to 5 parts by weight of antimicrobial enhancer and 1 to 5 parts by weight of deodorant performance enhancer based on 100 parts by weight of the synthetic wood composition Is added,
The strength enhancer comprises 40 to 50% by weight epoxy modified acrylic copolymer, 40 to 50% by weight phenol-modified rosin ester resin, 1 to 5% by weight thermoplastic polyurethane resin, and 1 to 5% by weight ethylene vinyl acetate copolymer ,
The anti-strain enhancer comprises 70 to 80% by weight of acrylonitrile-butadiene rubber and 20 to 30% by weight of chloroprene rubber,
The antimicrobial enhancer 40 to 60% by weight of the mica, dolomite 20 to 40% by weight and zeolite 10 to 30% by weight,
The deodorizing performance enhancing agent includes 80% by weight of red shale and 20% by weight of microbial mixture,
The microbial mixed solution contains 80 to 90% by weight of water, 5 to 15% by weight of microbial freeze and 1 to 10% by weight of rice bran,
The microbial freeze is 30 to 40 parts by weight of one or more strains selected from the group consisting of Bacillus subtilis , Bacillus megaterium and Bacillus coagulance in 100 parts by weight of water and 20-25 parts by weight of sugar is mixed and maintained at 20-25 ° C. for 3 days and then lyophilized.
Method for producing synthetic wood with excellent strength and weather resistance. delete