KR101333743B1 - Preparation method of eco-friendly synthetic wood composite, and eco-friendly synthetic wood composite prepared by the same - Google Patents

Abstract

The present invention relates to a production method of an eco-friendly synthetic wood composite, and the eco-friendly synthetic wood composite produced by the same, more specifically the production method of the synthetic wood composite, and the eco-friendly synthetic wood composite produced by the same which is capable of improving the matter properties of a product including waterproof and weatherproof properties by optimizing the mixture rate of wood powder, a polymer resin, and an additive and processing the wood powder with organic silane before mixing all components. The synthetic wood composite has fire retardant properties, and additionally have an emission effect of far-infrared rays and negative ions for using the composite has an external or internal material for a building.

Description

Preparation method of eco-friendly synthetic wood composite, and eco-friendly synthetic wood composite prepared by the same}

The present invention relates to a method for manufacturing environmentally friendly synthetic wood and an environmentally friendly synthetic wood produced using the same, and more particularly, to optimize the blending ratio of wood flour, polymer resin and additives in the production of synthetic wood, The present invention relates to a method for producing a synthetic wood that can improve the physical properties of a product manufactured by strengthening the adhesion between components by special treatment, in particular, water resistance and weather resistance, and an eco-friendly synthetic wood produced using the same.

Synthetic wood, which is in the spotlight as an eco-friendly material, is an eco-friendly, non-toxic product that combines wood grind and synthetic resin such as olefin resin and extruded or injection-molded at high temperature and pressure. It has been researched and developed as a substitute for wood in developed countries such as Japan, Europe and Japan, and it is widely commercialized.In Korea, CCA pursuant to Article 6, Part No. 06-4-59 (Chromium, Copper, Copper) The use of treated preservatives has been banned, and the use of synthetic wood has increased dramatically since.

Synthetic wood has excellent impact resistance, no damage by microorganisms, almost no color and no discoloration, resistant to moisture, and excellent elasticity, tensile strength, bending strength, compressive strength and impact strength. It has a semi-permanent lifespan. In addition, there is almost no emission of formaldehyde and volatile organic compounds (VOCs), harmless to the human body, synthetic timber after a certain period of time has the advantage that can be recycled through a process such as crushing after collection. In addition, the working method is the same as wood and can be processed through all woodworking products, so installation and construction are simple. When nails, screws, pieces, screws, etc. are used, they have a holding force of 2 to 4 times that of natural wood. In addition, it is a very useful building material with the characteristic of reducing the maintenance cost since it does not need a special surface treatment such as painting or oil stain since it recovers the initial appearance even with light water cleaning.

In particular, when using wood (wood), which is recognized as an existing high-quality material as an exterior material or interior material of buildings such as floorboards, ceiling boards, doors, door frames, windows, fences, etc. Because of the drawbacks of warpage and oxidization due to ultraviolet absorption, synthetic wood (PP or PE, etc.), wood flour, and other functional additives have been mixed in recent years instead of natural wood. I use it a lot.

In the case of the conventional synthetic wood, fine wood powder is not sufficiently dispersed in the synthetic resin and aggregated with each other, and a phenomenon in which the fine wood powder is separated from each other without being completely kneaded with the synthetic resin has been found. The reason for this is believed to be due to the poor adhesion due to the decrease in compatibility between the synthetic resin and the natural wood flour. Therefore, there was a need to strengthen the physical properties by strengthening the dispersibility and adhesion between synthetic resin and natural wood flour, which is the main component of synthetic wood, but the existing technology has not been studied how to solve such problems.

Accordingly, the present invention has been made to solve the problems of the prior art as described above, the physical properties of the synthetic wood produced by improving the kneading and compatibility with the synthetic resin by pre-treating the wood powder during the production of the synthetic wood, In particular, it is a task to improve water resistance, weather resistance and impact resistance, and it is an eco-friendly synthetic wood that is very beneficial to human health by strengthening anti-mildew and flame retardancy required for use in building and exterior materials, and additionally having far-infrared radiation and anion emission effects. To provide a technique for manufacturing.

In order to achieve the above object,

(1) treating wood powder with organic silane to obtain silane-treated wood powder;

(2) mixing the wood powder obtained in the above with an additive comprising a synthetic resin and an antioxidant, an ultraviolet stabilizer, a mold inhibitor and a flame retardant;

(3) extruding or injecting the mixture obtained above to obtain a molded article; And

(4) cutting and molding the molded article obtained above

The silane treatment in (1) includes R _1n Si (OR ₂ ) _4-n (n = 0 to 3, R ₁ = C _{1 to} C 6 alkyl group, OR ₂ = methoxy, ethoxy, acetoxy group It is carried out by dispersing the colloidal solution of wood powder dispersed in a solvent in the organic silane of 1), stirred for 1 to 10 hours, the temperature is increased to 50 to 100 ℃ in the reactor and treated for 1 to 5 hours Provides a method for producing environmentally friendly synthetic wood.

In order to achieve the above object,

Synthetic wood molded by extrusion or injection by mixing an additive comprising a synthetic resin and an antioxidant, an ultraviolet stabilizer, a mold inhibitor and a flame retardant to a wood powder silane-treated with an organic silane, wherein the silane treatment is R 1 _n Si (OR ₂ ) After dispersing the colloidal solution of wood powder dispersed in a solvent in an organic silane of _4-n (n = 0-3, R ₁ = C ₁ -C 6 alkyl group, OR ₂ = methoxy, ethoxy, acetoxy group) It is carried out by stirring for 1 to 10 hours and raising the temperature in the reactor to 50 to 100 ℃ for 1 to 5 hours, the water absorption rate of the synthetic wood (20 ± 2 ℃, evaluated after standing for 20 minutes) is 0.1 ~ It provides an environmentally friendly synthetic wood, characterized in that 1.5% and the accelerated weathering test (test evaluation according to KS M ISO 4892-2 A) results in 90 to 100%.

Referring to the features and advantages of the new eco-friendly synthetic wood according to the invention and the eco-friendly synthetic wood produced by the method as follows.

1. First, in the method for producing eco-friendly synthetic wood according to the present invention, in the case of using wood powder as a filler, the powder surface wood powder obtained by treating the surface with organic silane is used to liquid-process the surface of wood powder to agglomerate each other. Since it can reduce, dispersibility can be improved and the kneading | mixing property and adhesive force with synthetic resin can be strengthened, and the physical properties of the synthetic wood obtained, especially water resistance, weather resistance, and impact resistance can be strengthened.

2. In addition, the eco-friendly synthetic wood according to the present invention can solve the problem of shrinkage in the curing process by using a rubber-based low shrinkage agent.

3. In addition, the eco-friendly synthetic wood according to the present invention is excellent in its antibacterial properties and flame retardancy is suitable for use as building materials for interior and exterior interior.

4. In addition, the eco-friendly synthetic wood according to the present invention is very beneficial to human health by emitting negative ions and far infrared rays.

Hereinafter, the present invention will be described in more detail.

Eco-friendly synthetic wood production method according to the present invention

(1) treating wood powder with organic silane to obtain silane-treated wood powder;

(2) mixing the wood powder obtained in the above with an additive comprising a synthetic resin and an antioxidant, an ultraviolet stabilizer, a mold inhibitor and a flame retardant;

(3) extruding or injecting the mixture obtained above to obtain a molded article; And

(4) cutting and molding the molded article obtained above

It is configured to include, the silane treatment in (1) is R _1n Si (OR ₂ ) _4-n (n = 0-3, R ₁ = C1-C6 alkyl group, OR ₂ = methoxy, ethoxy, ace Oxy group) is dispersed by dispersing the colloidal solution of wood powder dispersed in a solvent, and then stirred for 1 to 10 hours, the temperature is increased to 50 to 100 ℃ in the reactor to perform for 1 to 5 hours It is done.

In more detail, the treatment of the wood powder with the organic silane in step (1) is described, by mixing about 10 to 100 parts by weight of the organic silane based on 100 parts by weight of wood powder to form an organic silane group on the surface of each powder particle of wood powder and pass through the reactor The reaction is carried out to obtain wood powder powder surface-treated with an organic silane group. At this time, the wood powder is dispersed in a colloidal state in a solvent such as water or alcohol, it is preferable to contact with the organic silane in the colloidal state.

The organosilane used in the present invention is preferably R 1 _n Si (OR ₂ ) _4-n (n = 0-3, R ₁ = C ₁ -C 6 alkyl group, OR ₂ = methoxy, ethoxy, acetoxy group) Specific examples thereof include, but are not limited to, dimethyldimethoxysilane, methyltrimethoxysilane, methyltriethoxysilane, tetraethoxysilane, and the like.

At this time, treating the surface of the wood powder with an organic silane is stirred for 1 to 10 hours at room temperature to form a wood powder powder formed with an organic group and then passed through the reactor. At this time, the reactor can be heated to a temperature of 50 ~ 100 ℃ as a heating device for 1 to 5 hours to prepare a surface silane-treated wood powder.

The surface silane-treated wood powder obtained in the above step is mixed with the synthetic resin and other additives in the step (2). At this time, the wood powder used in the present invention may be used as a pulverized product of natural wood or other fiber powder derived from plant fibers. Specifically, the wood powder may be one or two or more of the fiber size selected from 60 to 150 mesh, natural wood pulverized powder of 3 to 8% of water content or selected from crests, corn stalks, pulp, chaff. In addition, the wood powder may be used as a product of recycled wood or wood chips, sawdust and the like.

In addition, examples of the synthetic resin that can be used in the present invention may be selected from polyolefin resin, PVC resin, PS resin, polyamide (PA) resin, polyester resin, preferably polyolefin resin, more preferably Preferably polyethylene (eg HDPE, LDPE) or polypropylene. Although the molecular weight of the said polyolefin resin is not specifically limited, The range of 800-30,000 is preferable as a number average molecular weight.

The antioxidant is a component used to enhance the weather resistance by preventing the thermal stability of the processing process and the oxidation of the product by water or oxygen after installation, for example, without limitation, an phosphate-based antioxidant may be used. In addition, the UV stabilizer is a component used to enhance weather resistance by increasing the resistance to light, for example, bis 2,2,6,6-tetramethyl-4-piperidyl may be used without limitation. In addition, the anti-fungal agent may be used without limitation zeolite-based compound as a component that serves to prevent the formation of mold in the product. It is preferable to use what zeolite type antifungal agent supported silver, zinc, etc. which are antimicrobial anions in a zeolite. By mixing such a zeolite-based anti-fungal agent, it is possible to exhibit a stable mold prevention and antibacterial action without a change in physical properties during molding.

In addition, the flame retardant is a component that enhances the resistance to the flame of the synthetic wood to prevent the propagation of the flame or to extinguish itself, and specific examples may include, but are not limited to, inorganic materials such as calcium carbonate or aluminum hydroxide.

In the step (2) of the present invention, the mixture is 50 to 200 parts by weight of silane-treated wood powder based on 100 parts by weight of synthetic resin, 0.1 to 2.0 parts by weight of antioxidant, 0.1 to 1.0 parts by weight of UV stabilizer, and 0.1 to 2.0 parts of mold inhibitor It is preferable to mix | blend and the ratio of 1.0-50.0 weight part of flame retardants.

In addition, in the present invention, since the synthetic resin is accompanied by shrinkage while curing, the precision of the molded article may be degraded, cracks may be generated, and surface smoothness may be low. In order to overcome this, it is preferable to use a combination of a low shrinkage agent. In the production of the synthetic wood according to the present invention, liquid isoprene rubber and ABS (acrylonitrile-butadiene-styrene) as a low shrinkage agent in the additive of step (2). ) Rubber type liquid resins, such as resin, can be used 1 type or in mixture of 2 or more types.

The liquid isoprene rubber that can be used in the present invention is present in the liquid phase at room temperature, the number average molecular weight is preferably 3,000 to 50,000, preferably 7,000 to 30,000. Moreover, it is preferable to include the acid value whose acid value is 10-40, More preferably, about 15-30 in a molecule | numerator or terminal. In this way, when acid groups are introduced into the liquid isoprene rubber, compatibility with the synthetic resin may be improved, and the problem of die contamination due to separation of the liquid isoprene rubber during molding may be prevented.

The ABS resin that can be used in the present invention serves to alleviate the shrinkage of the synthetic resin and also improve the physical properties such as toughness of the base resin. Although the molecular weight of the ABS resin in the present invention is not particularly limited, the number average molecular weight is preferably 3,000 to 100,000, preferably about 5,000 to 50,000.

The amount of the low shrinkage agent is not particularly limited, but is preferably used in the range of 0.1 to 5.0 parts by weight based on 100 parts by weight of the synthetic resin.

In the present invention, the obtained synthetic wood can be used as a building material for indoor interior, so that it can have an anion and a far infrared ray emitting function as an additional function.

Far-infrared rays have various functions around life such as biological activation, water molecule activation, deodorization, and growth promotion. Most of the living organisms consist of water and proteins, and the body is activated when the vibration wavelength range of the molecular motion of the organic compound forming water or protein is similar to the far-infrared wavelength range. Near-infrared is not absorbed by the living body, but is reflected, but absorbs far-infrared rays and penetrates into the living body, causing self-heating, exerting the effect of thermolysis, promoting capillaries, promoting blood circulation, activating tissues, promoting metabolism, releasing waste and harmful metal Bring it. In addition, far-infrared rays are known to function to remove odors by neutralizing cations, which are the main culprit of odors, by anionizing air.

In addition, negative ions collide with oxygen molecules in the air to make the oxygen molecules have a negative charge, which is commonly referred to as oxygen anions or abbreviated 'anions'. As cations increase, the incidence of neuralgia, asthma, stroke, etc. is reported to be high due to the decrease of anions and cations in the human body. On the contrary, forests, waterfalls, and waves have a refreshing feel on the beaches because of the negative ions. When the atmosphere is stable, that is, in general indoor air, the ratio of anions and cations is about 1: 1.2. In general, positive ions are found in the polluted air, and negative ions are distributed in clear nature. It promotes metabolism, promotes vitality, clears blood, and is effective for nerve stabilization, fatigue recovery and appetite.

In the present invention, in the manufacture of environmentally friendly synthetic wood can be used by additionally adding a far-infrared radiation anion, anionic radiation or a mixture thereof. Far-infrared radiation materials that can be used in the present invention include tourmaline, loess, biotite, amethyst, raw ore, bamboo charcoal, uranite, noble stone, obsidian, elvanite, ore, ore, lava, gemstone, quartz, monzonite, gneiss and It is possible to use a ceramic material in powder form consisting of one or more natural stone materials selected from natural mineral groups such as rhyolite tuff. In addition, as the anion emitting material that can be used in the present invention, a ceramic powder composed of one or more rare earth natural stones selected from strontium, vanadium, zirconium, cerium, neodymium, lanthanum, barium, rubidium, cesium, and gallium may be used. In the present invention, such a functional ceramic powder is preferably included in the range of 0.1 to 5.0 parts by weight based on 100 parts by weight of the synthetic resin.

In addition, a pigment may be additionally used in the mixture of the step (2) according to the present invention for expressing a specific color such as natural wood color. Such pigments are preferably included in the range of 0.1 to 5.0 parts by weight based on 100 parts by weight of synthetic resin. As the pigments that can be used, organic or inorganic pigments may be used without limitation. Examples of inorganic pigments include, but are not limited to, titanium oxide, Carbon black, black iron oxide, red iron oxide, zinc oxide, lithopone, barium sulfate, aluminum hydroxide, lead sulfide, white lead, alumina white, calcium carbonate, silicon oxide, and silicon carbonate paste.

In addition, additives such as coupling agents, antifoaming agents, flame retardant aids, lubricants, and binders generally used in the art to which the present invention pertains may be added to the mixture used in step (2) without limitation.

The mixture in step (2) is kneaded by mixing the pellets with a synthetic resin and various additives to the surface-treated wood powder obtained in step (1). The method of kneading in the present invention is not particularly limited, and for example, a kneader, a mixer, a roll, an extruder, a kneading extruder, or the like can be used. In particular, a kneading extruder may be suitably used to knead and simultaneously thicken each component to perform extrusion, kneading, and thickening in one process and to produce a predetermined shape by continuously forming synthetic wood. Such a kneading extruder has a kneading function and an extrusion function at the same time, it is preferable to use a thing carrying a screw. Such a screw may be a uniaxial or biaxial one, and to increase the kneading efficiency, it is more preferable to use a kneading extruder in which a biaxial screw is embedded.

In addition, synthetic wood may be produced by the injection method, and the mixture obtained in step (2) may be heated to a temperature above the melting temperature of the synthetic resin to be liquefied, and the melt may be injected into a mold and cooled to form a synthetic wood of a desired shape. have.

Thereafter, the molded product obtained by the extrusion or injection may be cut to manufacture a final product, or may be used as a molded product as a building interior / exterior material.

In manufacturing the eco-friendly synthetic wood according to the present invention, by forming a coating layer of a different color on the surface of the synthetic wood and by peeling the surface coating by the roller can be formed a wooden pattern. At this time, the coating layer is preferably composed of a synthetic resin and silane-treated wood powder, sunscreen, antioxidants and pigments, the thickness is preferably only thin enough to coat the surface of the synthetic wood.

Environmentally friendly synthetic wood according to the present invention produced by the above method is the physical properties of the synthetic wood produced by improving the kneading and compatibility with the synthetic resin by using wood pre-treated with an organic silane compound, in particular water resistance, weather resistance and impact resistance Can improve. In particular, in the case of water resistance, the water absorption rate (20 ± 2 ℃, evaluated after standing for 20 minutes) is very small, in the range of 0.1 to 1.5%, and 90 to the result of accelerated weathering test (test evaluation according to KS M ISO 4892-2 A). Weather resistance can be improved to such an extent as 100%. In addition, it is very beneficial to human health by improving anti-mildew and flame retardancy required for use in building and exterior materials and concomitantly having far infrared radiation and anion emission effect.

Hereinafter, the present invention will be described in more detail with reference to Examples. It should be understood, however, that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, and thus are not limitative of the scope of the invention.

Example 1

<Organic Silane Pretreatment of Wood Powder>

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 ~ 800 rpm 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.

Mixture Preparation

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 mixed uniformly using a twin screw extruder to obtain a mixture.

<Production of Synthetic Wood>

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.

[Example 2]

The organic silane pretreatment was carried out in the same manner as in Example 1 except that the colloidal liquid (solid content: water = 30:70) obtained by mixing the natural wood crushed and chaff in a weight ratio of 70:30 was used.

[Example 3]

The preparation was carried out in the same manner as in Example 1, except that 1 part by weight of ganbanite and 1 part by weight of sorghum wool, which are functional ceramic fillers, were prepared.

Comparative Example 1

The same procedure as in Example 1, except that pure natural wood flour without organic silane treatment was used.

Comparative Example 2

The same procedure as in Example 2, except the use of a mixture of pure natural wood flour and chaff untreated with organic silane.

Performance evaluation

1. Property evaluation method

Using the samples of Examples 1 to 3 and Comparative Examples 1 and 2, the physical properties were evaluated using the following method.

(1) Specific gravity

The specific gravity of the sample is tested two or more times according to the method A (underwater substitution method) of KS M 3016, and the average value is recorded to three decimal places.

(2) bending maximum load

Determine the radius and test speed of the pressure rod and support according to KS M ISO 178, and measure the maximum bending load through the specimen. The test surface is the exposed surface at the time of construction, and three tests are made and the average value is recorded.

(3) bending creep deformation

In accordance with KS M ISO 899-2, the test specimen is loaded with 850 N within 1 to 5 seconds, held for 24 hours, and the flexural creep deformation is calculated. The test surface is the exposed surface at the time of construction, and three tests are made and the average value is recorded.

(4) impact resistance

After installing and fixing the test sample on the support, drop the ball of a steel ball with a diameter of 64 mm with a diameter of 1 042 g at 100 cm height in accordance with KS F 2221 and drop it to the center of the test piece. do.

(5) impact strength

The impact strength test uses notched specimens in accordance with KS M ISO 179-1, and the striking surface is the exposed surface during construction of the product and the average value for the five specimens is calculated and expressed as kJ / m ² .

(6) warping

The torsion test is allowed to stand until the test specimen reaches a constant at 3 days at temperature (25 ± 2) ° C, relative humidity (85 ± 5)%, and at temperature (20 ± 2) ° C, relative humidity (35 ± 5)%. Then, in accordance with KS L 3112, place the length gauge on the diagonal of the exposed surface during the construction of the composite timber, and when the measuring surface is concave, measure the wedge perpendicular to the length gauge at the largest gap between the length gauge and the test surface. Insert it so that the size of the gap is obtained by the scale indicated by the measuring wedge. In addition, when the measuring surface is convex, the measuring wedge is inserted into the gap between the length meter and the synthetic wood floor board at about the same at both ends, and the size of the gap is measured to obtain the average value. Do this for the other diagonal line on the same plane and record the largest value. The warping value Wa (%) is obtained according to the following equation and ends at the first decimal place.

W _a (%) = (h / l) × 100

From here

l ： Diagonal length of test object (mm)

h: Size of gap obtained from wedge scale (mm)

(7) screw holding force

The screw holding force test is carried out by applying a nominal diameter of 2.7 mm and a 16 mm length screw vertically with 11 mm of thread and fixing the specimen to pull the screw vertically. At this time, the maximum load is measured respectively, and the average value of the two locations is the screw holding force.

(8) slip resistance

The test method uses a slip tester in accordance with 4.15 of KS M 3510. The sliding piece used in the test shall be a rubber sheet of hardness durometer (durometer hardness test – type A) 7 580, 36 mm thick, specified in 4.15.2 of KS M 3510, and the surface of the test piece shall be dried. .

(9) water absorption rate

The specimens are pre-treated and weighed on a balance with an accuracy of 0.01 g or more until they are weighed at (20 ± 2) ° C and relative humidity (66 ± 5)% before the water absorption test. After the mass measurement, the specimen is treated under the following conditions and the mass change is recorded.

a) The specimen is immersed in 100 ℃ water for 5 hours. At this time, use a suitable jig to immerse the specimen without touching the bottom of the tank.

b) Immediately immerse the specimen after a) in water at (20 ± 2) ° C for 20 minutes, remove the moisture from the surface of the specimen, and measure the mass change.

Mass change rate (%) = (W ₂ -W ₁ ) / W ₁ × 100

W ₁ = mass before immersion (g)

W ₂ = mass after immersion (g)

(10) Freeze thawing test

In the freeze-thawing test, the following test is repeated three times in one cycle for three specimens, and the average value of the maximum flexural strength change is measured as a percentage by comparing with the initial maximum flexural load value.

a) Immerse the specimen in water at (20 ± 2) ° C for 24 hours.

b) Drain the specimen after immersion and leave it in the (-30 ± 2) ° C chamber for 24 hours.

c) Leave the specimen after step b) for 24 hours at (20 ± 2) ° C.

(11) length linear thermal expansion coefficient

The measurement of the coefficient of thermal expansion is performed in the temperature range of -30 ° C. to 60 ° C. according to KS M 3060 using a 50 mm long test specimen and calculated by the following equation.

Length coefficient of thermal expansion (a) = (L ₂ -L ₁ ) / [L ₀ (T ₂ -T ₁ )]

From here

L ₂ and L ₁ : Length of each test piece at temperatures T ₂ and T ₁

L ₀ : Length of test piece measured after standing at (20 ± 2) ℃ and relative humidity (66 ± 5)% for 3 days or more before test

(12) promote weather resistance

Under the conditions of method A of KS M ISO 4892-2, test up to 2 000 hours (340 nm standard, 0.55 w / m ² ) in the direction of the exposed surface, and test the impact strength by the method (5). Record the rate of change in%.

(13) Hazardous Substance Dissolution Test

The wood slab is pulverized so that the diameter of the pulverized particles is 5 mm or less, and the pulverized particles are sieved with a sieve having an eye size of 5 mm or less and a sieve having a size of 1 mm or more. 5) Collect the sample filtered to the size of mm by the conical quadrant method. After exactly weighing (100 ± 2) g of the pretreated sample, put it into a 2 000 mL Erlenmeyer flask, add hydrochloric acid to distilled water and add about 900 mL of acid solution with pH adjusted to (6 ± 0.3). After allowing the mixed solution to stand at room temperature and atmospheric pressure for 24 hours, toxic substances are eluted for 4 hours using a shaker having a shaking frequency of about 200 times per minute and an amplitude of (4 to 5) cm. The mixed solution is filtered through a glass fiber filter paper, the filtrate is placed in a 1 L volumetric flask, and the acidic solution prepared above is filled up to the 1 L mark and used as a sample solution. Arsenic test solution was arsenic by using KS I ISO 8288 (flame atomic absorption spectrophotometry), KS I ISO 11885 (application of inductively coupled plasma mass spectrometry) or KS I ISO 17294-2 (inductively coupled plasma atomic emission spectrometry). Analyze and record the elution amount of (As), cadmium (Cd), chromium (Cr), lead (Pb), mercury (Hg), etc.

(14) formaldehyde emission amount

The specimens shall be along the thickness of the product produced, length (150 ± 1) mm and width (50 ± 1) mm. Test by desiccator method in accordance with KS M 1998.

(15) Flammability

Specimens shall conform to thickness and width during production and shall be 30 cm in length. The flame retardancy test of the composite wood slab was carried out by drying the test specimen in air condition at (50 ± 2) ℃ for 48 hours according to the method A of 4.2 of KS F 2819, and then leaving it in a desiccator with silica gel for 2 hours. Heat for minutes to record the carbonization length and remaining flame time.

2. Property evaluation result

Table 1 shows the results of evaluating the respective physical properties using the above method using the samples of Examples 1-3 and Comparative Examples 1-2.

Test Items unit Quality standards Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Impact resistance (room temperature conditions) - No abnormality clear clear clear clear clear Impact resistance (low temperature condition) - No abnormality clear clear clear clear clear Distortion % 2.0 or less 0.0 0.0 0.0 0.0 0.0 Screw retention N H, H-T More than 400 1035 1040 1050 1030 1040 S, S-T 780 or more Slip resistance C.S.R 0.40 or more 0.55 0.57 0.58 0.56 0.55 Moisture inclusion rate % 8.0 or less 1.3 1.2 1.4 3.9 3.5 Freeze thawing % Initial 90 or higher 99.4 100.2 102.0 103.0 104.0 Length Linear Expansion Coefficient 1 / ℃ S-T, H, T 3.0 × 10 ^-5 or less 4.26 × 10 ^-5 4.15 × 10 ^-5 4.13 × 10 ^-5 4.50 × 10 ^-5 4.62 × 10 ^-5 S, H 3.0 × 10 ^-5 or less Flame Retardant-Carbonization Length cm 20cm or less 11 11 11 12 11 Flame Retardant-Carbonization Length cm 20cm or less 11 11 11 12 11 Flame Retardant-Carbonization Length cm 20cm or less 10 11 10 9 10 Flame Retardant-remaining flame s Less than 10 seconds 0 0 0 0 0 Flame Retardant-remaining flame s Less than 10 seconds One One One One One Flame Retardant-remaining flame s Less than 10 seconds 3 3 3 4 3 Formaldehyde Dissipation mg / L One &Lt; 0.1 &Lt; 0.1 &Lt; 0.1 &Lt; 0.1 &Lt; 0.1 Total Volatile Organic Compounds
(TVOC) mg / (㎡.h) One 0.003 0.003 0.001 0.002 0.003 Impact strength kJ / ㎡ One 3.2 4.0 3.9 2.8 2.2 lead mg / L One Not detected Not detected Not detected Not detected Not detected chrome mg / L One 0.02 0.01 0.02 0.02 0.01 cadmium mg / L One Not detected Not detected Not detected Not detected Not detected arsenic mg / L One Not detected Not detected Not detected Not detected Not detected Mercury mg / L One Not detected Not detected Not detected Not detected Not detected importance - One 1.235 1.233 1.230 1.240 1.233 Flexural maximum load N One 5182 5230 5302 5230 5200 Flexural creep deformation % One 0.05 0.05 0.04 0.05 0.04 Accelerated Weathering Test % One 92 99 98 82 79

As can be seen in the results of Table 1, the eco-friendly synthetic wood produced by the method according to the present invention can be confirmed that the equivalent level or more in terms of physical properties and manufactured by the existing method. In particular, it can be confirmed that the water absorption rate, which is a criterion for evaluating water resistance, and the accelerated weather resistance test, which is a weather resistance test criterion, show a remarkably superior result. This is believed to be the result of the improved kneading between the wood flour and the synthetic resin in the present invention, the adhesion between each other. From this, the eco-friendly synthetic wood products according to the present invention are very suitable to be used for indoor interior or outdoor building materials.

Claims (10)

(1) treating wood powder with an organosilane selected from dimethyldimethoxysilane, methyltrimethoxysilane, methyltriethoxysilane and tetraethoxysilane to obtain silane-treated wood powder;
(2) mixing the wood flour powder obtained above with an additive including a synthetic resin, an antioxidant, an ultraviolet stabilizer, a mold inhibitor and a flame retardant, and a liquid isoprene rubber having a number average molecular weight of 3,000 to 50,000 and an acid value of 10 to 40;
(3) extruding or injecting the mixture obtained above to obtain a molded article; And
(4) cutting and molding the molded article obtained above
The silane treatment in (1) comprises mixing 10 to 100 parts by weight of the organic silane based on 100 parts by weight of wood powder dispersed in a colloidal state in water or alcohol and stirring the mixture for 1 to 10 hours. After forming a sol (sol) of the organic silane group bonded to the surface of the powder particles of wood powder, it is carried out by reacting for 1 to 5 hours through a reactor of 50 ~ 100 ℃,
The wood powder used in the above (1) is a particle size of 60 ~ 150 mesh, water content of 3 to 8% of natural wood pulverized or from one or two or more kinds of fibrous powders selected from rice husks, corn stalks, pulp, chaff Method for producing an eco-friendly synthetic wood, characterized in that.
delete The method of claim 1, wherein the synthetic resin is selected from polyolefin resin, PVC resin, PS resin, polyamide (PA) resin, polyester resin, the antioxidant is a phosphate-based antioxidant is used, UV stability As the zero, bis 2,2,6,6-tetramethyl-4-piperidyl is used, the zeolite-based compound is used as the antifungal agent, and calcium carbonate or aluminum hydroxide is used as the flame retardant. Method of manufacturing eco-friendly synthetic wood.
The method according to claim 1, wherein the mixture in step (2) is 50 to 200 parts by weight of silane-treated wood powder, 0.1 to 2.0 parts by weight of antioxidant, 0.1 to 1.0 parts by weight of UV stabilizer, 0.1 to 1 part of mold inhibitor based on 100 parts by weight of synthetic resin Method for producing an environmentally friendly synthetic wood, characterized in that the mixture of 2.0 parts by weight and flame retardant 1.0 to 50.0 parts by weight.
delete The method according to claim 1, wherein the (2) additives far infrared ray emitting material, anion emitting material or mixtures thereof are further included in the range of 0.1 to 5.0 parts by weight.
The method according to claim 1, wherein the step (2) the additive of the eco-friendly synthetic wood, characterized in that the pigment is further included in the range of 0.1 to 5.0 parts by weight.
The method of claim 1, wherein the wood pattern is formed by forming a coating layer having a different color on the surface of the synthetic wood and peeling off the surface coating by a roller.
The method of claim 8, wherein the coating layer is composed of synthetic resin and silane-treated wood powder, sunscreen, antioxidant and pigment, the thickness of the production of eco-friendly synthetic wood, characterized in that configured to coat the surface of the synthetic wood Way.
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