KR102035969B1 - Eco-friendly synthetic wood containing coffee grounds and manufacturing method thereof - Google Patents

Abstract

The present invention provides an eco-friendly synthethic wood and a manufacturing method thereof, wherein the eco-friendly synthethic wood comprises coffee waste, a polyester blend resin (PET/ PCTG), cork chips, and aluminum hydroxide, thereby being able to reduce a shrinkage expansion rate and a water absorption rate of a synthetic wood, and also can provide the eco-friendly synthethic wood while improving moldability, post-processing and weather resistance of the synthetic wood by utilizing advantages of an ester-based oil and preventing problems.

Description

ECO-FRIENDLY SYNTHETIC WOOD CONTAINING COFFEE GROUNDS AND MANUFACTURING METHOD THEREOF}

The present invention relates to an environmentally friendly synthetic wood containing a coffee foil and a method of manufacturing the same, and more particularly, to include an excessive amount of coffee foil limited to a specific ingredient and content to effectively recycle the coffee foil, and the shrinkage expansion rate and moisture of the synthetic wood The present invention relates to an eco-friendly synthetic wood and a method for manufacturing the same, which can reduce the absorption rate, thereby reducing the defect of the synthetic wood, and improve the moldability, post-processing and weather resistance of the synthetic wood.

Synthetic wood contains more than 50% of the wood-based fibers, mainly refers to the flooring is installed outdoors. There are many varieties of synthetic wood, mainly wood flour, chaff, and reed.

The wood flour is a high lignin component may cause defects such as cracking, swelling, cracking, warping in the synthetic wood over time. The chaff has a characteristic of having a high specific gravity and a coarse fiber, which can shorten the life of the cylinder screw of the machine and has a problem in that processing is not easy due to low workability. The reeds are too complicated to collect and crush the reeds, and may be harmful to the human body due to the generation of fine dust during crushing, and because the powder is too light, it is difficult to transfer from the hopper, which is difficult to mold.

Conventional synthetic wood is produced by mixing such reeds and wood flour, at this time, due to the difference in the specific gravity of the reeds and wood flour, there is a great difficulty in forming and mixing, moreover, the reeds and wood flour particle shape is different, so the sanding (brush) after processing There is a problem that after treatment the synthetic wood is not aesthetically good.

In addition, one of the biggest causes of the defect of such synthetic wood is the shrinkage expansion rate. In the case of the synthetic wood produced by mixing the conventional reed and wood powder, such shrinkage expansion rate and water absorption rate is more than a certain level, there is a problem that often occurs when manufacturing synthetic wood.

Meanwhile, according to a research team at Harvard Public Health University, women who drink four cups of coffee in 8 ounces daily have a 20% lower risk of developing depression, and the caffeine content of coffee is serotonin or dopamine. It has been found to affect the same brain chemicals.

In addition, two 8-ounce coffee cups contain about 200 mg of caffeine, which has been shown to improve long-term memory. Some 200-300 mg of caffeine every day improves blood flow during breaks and improves the heart. Making it work better and drinking two cups of coffee a day has also been shown to help prevent liver diseases such as cirrhosis.

According to the Harvard team, which surveyed 28 studies, drinking coffee can reduce the risk of developing type 2 diabetes by 33 percent and lower the risk of gout by 59 percent for men who drink coffee every day. In addition, coffee has the effect of lowering uric acid levels in the blood, and a 2012 study found that women who ate three or more cups of coffee daily had a significantly lower risk of basal cell carcinoma.

As the efficacy of the coffee is known, the consumption of coffee is increasing every year. Accordingly, the amount of coffee foil (drinks) discarded after the coffee is dropped with the increase of coffee imports is also increasing every year. Coffee nights come mainly from coffee shops and coffee making factories. According to the March 2017 statistics, there are more than 90,000 domestic coffee shops, more than the number of chicken shops and convenience stores combined.

However, the Ministry of Environment's measures to recycle coffee foil are still in its infancy. Coffee foil has been classified as household waste according to the Waste Management Act, and most of it has been landfilled or incinerated, and the Ministry of Environment recently revised the Waste Management Act related regulations to allow the waste disposal reporter to collect, transport and recycle the coffee foil.

On the other hand, since the coffee foil has excellent moisture control ability and directionality, using this as a synthetic wood has the advantage of utilizing the above characteristics. However, coffee foil contains a large amount of oil, and even if it is dried and recycled as a material of synthetic wood, too much oil content is difficult to mix with the resin, so it is still difficult to produce a proper synthetic wood. Even if the coffee foil is recycled, the synthetic wood is manufactured by adding a large amount of additional chemical additives after minimizing the content thereof, so that it is not environmentally friendly, and the efficiency of recycling the coffee foil is deteriorated.

Domestic Publication No. 2017-0030163 Domestic Publication No. 2016-0057934 Domestic Patent Publication No. 10-1381158

The present invention is eco-friendly by excluding chemical additives as much as possible while maximizing the use of coffee foil as waste, and can reduce the shrinkage expansion rate and moisture absorption rate of the synthetic wood, thereby reducing defects of the product, and the formability and post-processability of the synthetic wood. And to provide an environmentally friendly synthetic wood and a method of manufacturing the same containing a coffee foil to improve weather resistance.

One aspect of the invention, coffee foil; 70 to 80 parts by weight of polyester blend resin (PET / PCTG) based on 100 parts by weight of the coffee foil; 5 to 7 parts by weight of cork chips; And 10 to 15 parts by weight of aluminum hydroxide; It provides an eco-friendly synthetic wood containing coffee foil containing.

According to a preferred feature of the invention, the coffee foil, the water content is less than 5%, the content of the ester-based oil may be 14 to 16% by weight of the total weight of the coffee foil.

Another aspect of the invention, the first step of mixing the polyester blend resin (PET / PCTG), cork chips and aluminum hydroxide and heated at 90 to 110 ℃ to prepare a first mixture; A second step of mixing and cooling the first mixture and the coffee foil having a temperature difference of 60 ° C. or more to the first mixture to prepare a second mixture; Extruding the second mixture through an extruder to pelletize; And a fourth step of molding the pelletized second mixture into a molding machine to form synthetic wood; It includes, The ash 1 mixture, 70 to 80 parts by weight of polyester blend resin (PET / PCTG) with respect to 100 parts by weight of the coffee foil; 5 to 7 parts by weight of cork chips; And 10 to 15 parts by weight of aluminum hydroxide; It provides a method for producing an environmentally friendly synthetic wood containing coffee foil to mix to include.

According to a preferred feature of the present invention, before the second step, the drying operation of the coffee foil can be carried out by a screw heater so that the moisture content of the coffee foil is less than 5%.

According to one embodiment of the present invention, including the coffee foil, polyester blend resin (PET / PCTG), cork chips and aluminum hydroxide, it is possible to reduce the defect of the product by reducing the shrinkage expansion rate and water absorption rate of the synthetic wood It can be manufactured eco-friendly by excluding the use of chemical additives while increasing the content of coffee foil by utilizing the advantages of ester-based oils and preventing problems, and improving the formability, post-processing and weather resistance of synthetic wood. It can be effected.

1 is a flowchart illustrating a method of manufacturing synthetic wood according to an embodiment of the present invention.
Figure 2 is a photograph showing a dried coffee foil used in the production of synthetic wood of the present invention.
3 is a photograph showing a coffee cake coming out of the coffee shop.
Figure 4 is a photograph showing the aluminum hydroxide used in the production of synthetic wood of the present invention.
Figure 5 is a photograph showing an example of a polyester blend resin that can be used in the production of synthetic wood of the present invention.
Figure 6 is a photograph showing a dryer for drying coffee foil in the manufacturing method according to an embodiment of the present invention.
7 is a photograph showing pellets in the manufacturing method according to an embodiment of the present invention.
8 is a photograph showing a synthetic wood produced by the manufacturing method according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described. However, embodiments of the present invention may be modified in many different forms, and the scope of the present invention is not limited to the embodiments described below. In addition, the inclusion of any component throughout the specification means that it may further include other components, except to exclude other components unless specifically stated otherwise.

Synthetic wood of the present invention may be made in the form of, for example, board, lumber, and the like, and includes coffee foil, aluminum hydroxide, cork chips and polyester blend resin (PET / PCTG).

Referring to FIG. 2, since the coffee foil has a characteristic of controlling moisture around and has a directionality, when used as a synthetic wood, such a characteristic may act as an advantage that is differentiated from other synthetic wood.

In addition, since the coffee foil has a natural color of coffee, it is not necessary to use a separate inorganic pigment when manufacturing synthetic wood, and thus, if the synthetic wood has a natural color of coffee, it is difficult to discolor by ultraviolet rays. You can expect

In addition, the coffee foil should have a moisture content of less than 5%. When the moisture content of the coffee foil is 5% or more, the bonding strength between the coffee foil and the resin decreases due to moisture, and thus it is difficult to obtain a strength suitable for producing a synthetic wood. In addition, the coffee foil may have a constant particle size. Since the coffee foil coming out of the coffee manufacturing plant has a moisture content of 60% or more, in this embodiment, it is preferable to use the coffee foil coming out of the coffee shop having a water content of about 30% as shown in FIG. 3.

In addition, the coffee foil may include 14 to 16% by weight of the ester-based oil based on the total weight. The ester-based oils may play all roles such as UV blockers, stabilizers, lubricants, antioxidants and pigments added during the production of existing synthetic wood. In this embodiment, it is not necessary to add chemical additives such as UV blockers, stabilizers, lubricants, antioxidants and pigments in the production of synthetic wood, thereby producing environmentally friendly synthetic wood.

When the content of the ester-based oil is less than 14% by weight, the role of such UV blockers, stabilizers, lubricants, antioxidants and pigments are not properly implemented, and when the content of the ester-based oil exceeds 16% by weight, such UV-blocking agents, Since the effects of stabilizers, lubricants, antioxidants and pigments no longer increase significantly, the maximum value of the content of the ester-based oil is preferably 16% by weight in consideration of the production cost.

However, the ester-based oil contained in the coffee foil may be a cause of making it difficult to mix with other raw materials. In the present embodiment, the cork chip may play a role of solving the problem of the ester-based oil so that the coffee foil can be well mixed with other raw materials, especially polyester blend resin.

In addition, the cork chip, may include 5 to 7 parts by weight based on 100 parts by weight of the coffee foil. When the content of the cork chip is less than 5 parts by weight, a problem of poor mixing due to ester-based oil may occur. When the content of the cork chip exceeds 7 parts by weight, the effect of preventing poor mixing by the ester-based oil is no longer significant. Since it is not improved, the maximum value of the content of the cork chip in consideration of the manufacturing cost is preferably 7 parts by weight or less.

Referring to FIG. 4, the aluminum hydroxide may provide thermal stability to the cork chip to prevent the cork chip from being carbonized, and at the same time, serve as a filler such as calcium carbonate.

Such aluminum hydroxide may include 10 to 15 parts by weight based on 100 parts by weight of the coffee foil. If the content of the aluminum hydroxide is less than 10 parts by weight may cause a problem that the thermal stability is not provided sufficiently, if the content of the aluminum hydroxide exceeds 15 parts by weight, the load of the wood molding increases and shorten the life of the screw of the molding apparatus And the hole of the compound die may be clogged.

The polyester blend resin is one of the main components to make a synthetic wood in this embodiment, it may include 70 to 80 parts by weight based on 100 parts by weight of the coffee foil.

The polyester blend resin is a copoly polymer obtained by crystallizing a PET / PCTG blend chip obtained by compounding a copolyester (PCTG: Poly-Cyclohexylenedimethylene Terephthalate Glycol-modified) in polyethylene terephthalate (PET). As an ester blend resin, it is an environmentally friendly resin in which BPA is not detected. The structure of the PETG is shown in Structural Formula 1 below.

[Formula 1]

These polyester blend resins have excellent interfacial adhesion, so that even without using a separate binder, it is possible to improve the strength of the manufactured synthetic wood to be firm and have a low shrinkage expansion rate. In addition, the polyester blend resin provides superior weather resistance compared to PE or PP mixed with UV even without using a separate UV stabilizer to minimize the occurrence of problems such as swelling, bending and cracking even when exposed to a long time climate. Can be.

Such polyester blend resin may comprise 70 to 80 parts by weight based on 100 parts by weight of coffee foil. When the content of the polyester blend resin is less than 70 parts by weight based on 100 parts by weight of coffee foil, it is difficult to produce the weatherability and strength improvement and the shrinkage expansion rate reduction effect of the synthetic wood, if the content exceeds 80 parts by weight too much resin addition amount This can lead to greater shrinkage and increased product prices. In addition, the content of the coffee foil is relatively small, the problem may occur that the synthetic wood of the present invention becomes difficult to meet the conditions that provide excellent moisture control ability and aroma of the coffee foil.

In addition, since the polyester blend resin plays a role of determining the strength of the synthetic wood, if you want to increase the strength of the synthetic material to be made, it is necessary to increase the amount of the polyester blend resin, on the contrary, it is closer to environment-friendly synthesis than high strength If the material is to be made, the amount of the polyester blend resin may be reduced.

In addition, the polyester blend resin can act as an oil stain to prevent the penetration of moisture in the atmosphere by combining with the natural oil of the coffee foil, it can be manufactured and used as a product utilizing existing wood, such as floorboards.

In the present invention, the polyester blend resin may use a product (trade name Ecogen) of SK Chemical shown in FIG. 5, but the present invention is not limited thereto. The ecogen has a high T _g and flexural strength and has a heat deflection temperature (HDT) that can be used both indoor and outdoor. In this case, the heat deformation temperature may be 85 to 109 ° C. In addition, the ecogen has a flame retardancy of V2 based on UL-94 can improve the heat resistance and flame resistance of the environmentally friendly synthetic wood of the present invention.

Hereinafter, a method for producing an eco-friendly synthetic wood containing a coffee foil of the present invention will be described in detail by way of example.

In order to manufacture the eco-friendly synthetic wood containing the coffee foil of the present embodiment, first the coffee foil must be processed in an appropriate state.

As shown in FIG. 1, the first collected coffee foil has a high water content and thus has a light brown color. Since this high water content cannot be used as a raw material of synthetic wood, the collected coffee foil is used as a large dryer or the like shown in FIG. Using the drying operation to lower the moisture content to less than 5% (S1).

At this time, since the hot air drying method has a very low drying efficiency due to the high moisture content of the first collected coffee foil, the drying operation of the coffee foil is preferably performed by a screw heater method having excellent drying efficiency.

The screw heater type drying apparatus used in the present embodiment includes a semicircular electric furnace having an open top, a screw installed in the electric furnace in the longitudinal direction, and a heater installed below the electric furnace, so that the coffee foil is transferred by the screw. However, due to the heating of the heater installed on the lower side of the screw is to dry the coffee foil in such a way that the moisture contained in the coffee foil is evaporated.

Coffee foil dried in this manner has a dark dark brown color, wherein the ester-based oil may be included 14 to 16% by weight based on the total weight of the coffee foil.

Since the ester-based oil can replace all the roles of UV blockers, stabilizers, lubricants, antioxidants, and pigments added in the conventional synthetic wood production, in the present embodiment, UV blockers, stabilizers, lubricants, There is no need to add chemical additives such as antioxidants and pigments, thereby producing environmentally friendly synthetic wood.

However, the ester-based oils cause the coffee foils to become entangled with each other and make it difficult to mix between the coffee foil and other raw materials, thereby reducing the binding force between the coffee foil and the resin, which is the main raw material, and thus, in the pelletizing and molding process described later. It can act as a cause of poor molding. In the present invention, such a problem can be solved by the blending procedure between the coffee foil and other raw materials described below.

Thus, in the present embodiment, even if the coffee foil is added up to 70% by weight relative to the total weight of the synthetic wood, the problem that the mixing between the coffee foil and other raw materials as described above becomes difficult, and the problem that the bonding strength between the coffee foil and the resin is lowered is prevented. Can be.

For this purpose, the mixing order of the raw materials for producing the synthetic wood is very important. In the present embodiment, the first mixture is prepared by first mixing the remaining raw materials except for the coffee foil (S2).

At this time, the main component of the remaining raw material should be a thermoplastic resin as a resin, preferably an amorphous resin can be used among the thermoplastic resin. The amorphous resin may be of various kinds, such as ABS, PC, PETG and PCTG, in this embodiment, it is possible to utilize PET / PCTG excellent in workability, high cooling rate and excellent interfacial adhesion.

The polyester blend resin is a copoly polymer obtained by crystallizing a PET / PCTG blend chip obtained by compounding a copolyester (PCTG: Poly-Cyclohexylenedimethylene Terephthalate Glycol-modified) in polyethylene terephthalate (PET). As the ester blend resin, an environmentally friendly resin in which BPA is not detected can be used.

In addition, since the polyester blend resin plays a role in determining the strength of the properties of the first mixture, if you want to increase the strength of the synthetic wood to be made, the amount of the polyester blend resin may be increased, on the contrary, it is more environmentally friendly than high strength. If you want to make a synthetic wood close to the amount of the polyester blend resin may be reduced.

The first mixture was heated at 90 to 110 ° C by adding 70 to 80 parts by weight of PET / PCTG, 5 to 7 parts by weight of cork chips, and 10 to 15 parts by weight of aluminum hydroxide to the blender, based on 100 parts by weight of coffee foil. You can arrange.

At this time, when the heating temperature is less than 90 ℃ the first mixture is not sufficiently heated, when mixing with the coffee foil to be described later is not properly mixed can cause a problem that the bonding strength with the polyester blend resin is lowered, the heating temperature is 110 If it exceeds the temperature may cause a problem that the cork chips, which have evaporated moisture is carbonized.

At this time, the cork chip has an air hole inside the chip has a specific gravity of about 0.2 so that the volume relative to the weight becomes relatively large. Therefore, even if only 7 parts by weight or less can realize the effect of sufficiently absorbing the oil of the coffee foil. However, since the cork chip has a property of being carbonized when it is 80 ° C. or higher, a heat stabilizer must be used to prevent such carbonization.

In the case of a general lead stabilizer, the performance is good, but since the heavy metal is contained, the aluminum stabilizer is used in the present embodiment, and aluminum hydroxide may be preferably used as the aluminum stabilizer.

The aluminum hydroxide may provide thermal stability to the cork chip described above to prevent the cork chip from being carbonized, and at the same time, may serve as a filler such as calcium carbonate.

In addition, the aluminum hydroxide may further serve as an auxiliary flame retardant, thereby further imparting flame retardancy to the finished synthetic wood.

If the amount of aluminum hydroxide is less than 10 parts by weight, thermal stability may not be sufficiently provided, and carbonization may occur in some of the cork chips. If the content of the aluminum hydroxide is more than 15 parts by weight, the load is increased during molding of synthetic wood. This can shorten the life of the device screw and cause clogging of compound die holes.

Next, the first mixture thus prepared is placed in a cooling device. At this time, by putting together the coffee foil in the cooling device to prepare a second mixture (S3).

In this process, the heated cork chip absorbs moisture and oil from tens of thousands of air holes remaining in the coffee foil, thereby solving various problems due to entanglement between the raw materials generated by the ester-based oil.

At this time, the first mixture containing PET / PCTG, cork chips and aluminum hydroxide is first prepared, and then, while the coffee foil is put separately, the second mixture is cooled to prepare a second mixture. This is to allow the cork chip to be well absorbed evenly due to the temperature difference between the and.

In addition, the temperature of the coffee foil before being put into the cooling device should be such that the temperature difference from the heated cork chips is 60 ° C. or more and generally less than 30 ° C.

If the temperature of the coffee foil is more than 30 ℃ or the temperature difference between the coffee foil and the cork chips is less than 60 ℃, the oil content of the coffee foil is not sufficiently absorbed by the cork chips, so that the binding force between the coffee foil and PET / PCTG in preparing the second mixture This may be lowered, which may act as a cause of poor molding when forming a synthetic wood.

Next, the second mixture is introduced into an extruder and extruded at a high pressure to make a pellet as shown in FIG. 7 (S4). Then, the pelletized second mixture is put into a molding machine such as a transfer screw cylinder and molded into a synthetic wood product having a desired shape as shown in FIG. 8 (S5).

The second mixture is not only easy to transfer pellets to the extrusion molding machine, but also easy to mold the pellets, and the ester-based oil of the coffee foil absorbed by the cork chips serves as a lubricant to improve the flow of the resin without adding lubricant. Therefore, the life of the cylinder screw of an extrusion molding machine can be extended.

On the other hand, in the case of preserving wood or natural wood, the work of oil stenting every six months to extend the life, the synthetic wood of the present embodiment is a separate oil because the ester-based oil absorbed by the cork chip provides this oil stenting effect It is possible to block UV rays without adding a UV blocker, and even if it rains, moisture is not absorbed into the product, and thus oxidation resistance is achieved, thereby having excellent weather resistance.

In addition, in the present embodiment, since the cork chip evenly absorbs the oil in the coffee foil, it can be easily mixed with the coffee foil and the polyester blend resin, which has all the advantages of the coffee foil and the polyester blend resin Synthetic wood can be provided.

The invention is not limited by the embodiment described above. Accordingly, various forms of substitution, modification, and alteration may be made by those skilled in the art without departing from the technical spirit of the present invention described in the claims, which are also within the scope of the present invention. something to do.

S1: coffee foil drying step
S2: preparing the first mixture
S3: preparing the second mixture
S4: pelletization step
S5: forming step

Claims (4)

Coffee foils having a unique natural color of coffee, having a water content of less than 5%, and an ester-based content of 14 to 16% by weight relative to the total weight of the coffee foil;
70 to 80 parts by weight of polyester blend resin (PET / PCTG) based on 100 parts by weight of the coffee foil;
5 to 7 parts by weight of cork chips; And
10 to 15 parts by weight of aluminum hydroxide; Eco-friendly synthetic wood containing coffee foil containing.
delete A first step of mixing a polyester blend resin (PET / PCTG), cork chips and aluminum hydroxide and heating at 90 to 110 ° C. to prepare a first mixture;
The coffee foil is dried by a screw heater method including a screw installed in the electric furnace in a longitudinal direction and a heater installed below the electric furnace, and has a dark dark brown color and has a water content of less than 5% and an ester-based content of the coffee foil. A second step of preparing a coffee foil having a weight ratio of 14 to 16 wt% based on the total weight and mixing and cooling the first mixture and the coffee foil having a temperature difference of 60 ° C. or more to the first mixture to prepare a second mixture;
Extruding the second mixture through an extruder to pelletize; And
A fourth step of molding the pelletized second mixture into a molding machine to form synthetic wood; Including,
The ash mixture, 70 to 80 parts by weight of polyester blend resin (PET / PCTG) with respect to 100 parts by weight of the coffee foil; 5 to 7 parts by weight of cork chips; And 10 to 15 parts by weight of aluminum hydroxide; Method for producing an environmentally friendly synthetic wood containing coffee foil to mix to include.
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