KR102076232B1 - Bio-synthetic Wood Made of Waste Plastics And a Method of Manufacturing the Same - Google Patents

Abstract

The present invention relates to bio-synthetic wood using waste plastic, which recycles the waste plastic and fiber of waste wood, agricultural waste, and the like to reduce discharged waste and recycle the bio-synthetic wood discarded after use as bio-synthetic wood of the same kinds; and a manufacturing method thereof. According to the present invention, the bio-synthetic wood using waste plastic comprises: a core part including waste plastic powder, fiber powder acquired from waste wood or agricultural waste, and a first composition including a crosslinking agent, a dispersant, a foaming agent, a processing additive, and a shock resistant agent; and a cover part made of a second composition including PVC resin, a stabilizer, and an additive, and laminated on the outer surface of the core part by a predetermined thickness to form a wood pattern.

Description

Bio-synthetic Wood Made of Waste Plastics And a Method of Manufacturing the Same}

The present invention relates to bio-artificial wood, and more particularly, to a bio-artificial wood made from fibers such as waste plastics, waste wood or agricultural wastes, and a manufacturing method thereof.

Waste plastics as a waste have recently emerged as a global environmental pollutant. General methods of waste plastics include landfill or incineration. However, except for biodegradable plastics, most plastics are not decomposed, and due to its bulky volume, it is difficult to construct landfills. This brings a lot of problems.

On the other hand, in the case of incineration of waste plastics, toxic gases such as dioxins are generated and energy loss is large, so a lot of facility investment is required to be an efficient alternative. Therefore, a method of appropriately recovering and recycling waste plastics has emerged as the best solution from the viewpoint of environmental protection and recycling of useful resources.

Although the research on the recycling of waste plastics is being actively carried out all over the world, until now, only the decomposition mechanisms of some plastics have been published, and there are few examples of how to recover waste plastics and economically reuse them. However, industrially, only a single composition of thermoplastics such as HDPE, LDPE, PP, and the like is mixed with sawdust in the United States and Europe and used as artificial wood.

Conventional artificial wood has been introduced by mixing the filling material (stone powder, wood powder, other pulverized product) to the waste plastic and stirring the filler in a completely molten state of the waste plastic to produce a pellet form and then press-molded in a compactor.

Artificial wood products made of these materials have high density of plastics, which can cause severe shrinkage and expansion depending on the climate, and are not suitable to substitute for sophisticated construction materials, especially since they are not nailed and sawed well. It is true.

Republic of Korea Patent Publication No. 10-1995-0013678 Republic of Korea Patent Registration No. 10-1756821 (2017.07.05.registration)

The present invention is to solve the above problems, an object of the present invention is the same kind of bioplastics discarded after use with the effect of reducing waste discharged by recycling waste plastics and fibers such as waste wood or agricultural waste. The present invention provides a bio artificial wood that can be recycled as a bio artificial wood and a method of manufacturing the same.

Bio-artificial wood using waste plastic according to the present invention for achieving the above object is a waste plastic powder obtained by processing waste plastic, fibrous powder obtained by processing waste wood or agricultural waste, crosslinking agent, dispersant, foaming agent A core part made of a first composition including a processing aid, an impact modifier, a flame retardant, and the like; And a second composition in the form of a master batch containing a stabilizer, a pigment, titanium dioxide (TiO ₂ ), a UV blocking agent, and an additive in a thermoplastic resin, and laminated to a constant thickness on an outer surface of the core part. And a cover part to generate a wood pattern.

The cover portion and the core portion are made by extrusion molding integrally.

In addition, the method for producing a bio-artificial wood of the present invention,

(S1) pulverizing the waste plastic to produce a waste plastic powder;

(S2) pulverizing waste wood or agricultural waste to produce a fibrous powder;

(S3) mixing the waste plastic powder and the fibrous powder with a crosslinking agent, a dispersing agent, a foaming agent, a processing aid, an impact modifier, a flame retardant, and the like, and heating and kneading the mixture at a predetermined temperature to prepare a gel-like biosynthetic raw material;

(S4) preparing a powdered first composition by cooling the gel-like synthetic raw material in a predetermined temperature range;

(S5) extruding the core part by putting the first composition into a first extrusion molding machine;

(S6) The second composition is injected into a second extrusion molding machine connected to one side of the first die of the first extrusion molding machine, and the second composition is supplied to the outside of the core part passing through the first die, and the cover part is laminated while being extruded. Making;

(S7) cooling the stack of the core portion and the cover portion extruded through the primary die;

It includes.

The waste plastic powder and fiber powder preferably has a size of 30 ~ 120 mesh (mesh).

Before performing the step (S3), the waste plastic powder and the fibrous powder are first heated and dried and melted while rotating in a temperature range of 50 ~ 150 ℃.

In the step (S7) while passing through the vacuum calibrator (vacuum calibrator) connected to the vacuum pump and the stack of the core portion to generate a vacuum pressure to form a final product form and at the same time supplying cooling water to cool.

In the step (S6), the second extrusion molding machine is connected to the side of the primary die of the first extrusion molding machine and supplies the second composition from the side of the core portion passing through the primary die to stack the cover portion on the outer surface of the core portion.

A raw material supply passage is formed inside the primary die to communicate with the side extrusion nozzle provided at the tip of the second extrusion molding machine to guide the second composition in the molten state discharged through the side extrusion nozzle into the cavity. The raw material supply passage is preferably formed as a passage extending from one side of the primary die to the upper side and then branched from both sides of the upper side of the cavity to both sides, and then communicating to both sides of the upper surface of the cavity.

The bio-artificial wood of the present invention includes a core part extruded from waste plastic and a powder material made by pulverizing waste wood or agricultural waste, and a cover part made of a resin material laminated and laminated on an outer surface of the core part. And the cover part is produced by extrusion molding at the same time is very easy to manufacture, there is a low cost advantage.

In addition, since bio-artificial wood is made by recycling waste plastics and waste wood or agricultural waste, it is possible to minimize environmental pollution and to obtain resource recycling effects.

When pine nut powder is mixed as the material of the first composition forming the core portion, the effect of containing phytoncide can also be obtained.

1 is a perspective view of a bio artificial wood using waste plastics according to an embodiment of the present invention.
Figure 2 is a flow chart showing an embodiment of a method for manufacturing bio-artificial wood according to the present invention.
Figure 3 is a front view showing the configuration of an embodiment of a manufacturing apparatus for producing a bio-artificial wood according to the present invention.
4 is a plan view of the bio-artificial wood manufacturing apparatus shown in FIG.
FIG. 5 is a plan view illustrating a twin screw of the first extrusion molding machine configured in the bio artificial wood manufacturing apparatus shown in FIG. 3.
FIG. 6 is a plan view illustrating a main part of an extrusion molding process performed in the bio-artificial wood manufacturing apparatus shown in FIG. 3.
FIG. 7 is a cross-sectional view taken along the line II of FIG. 5.
Figure 8 is a test report showing the results of the maximum load test for the artificial bio-wood prototype manufactured by the manufacturing apparatus and method according to the present invention.

Configurations shown in the embodiments and drawings described herein are only preferred examples of the disclosed invention, and there may be various modifications that may substitute the embodiments and drawings of the present specification at the time of filing of the present application.

Hereinafter, with reference to the accompanying drawings will be described in detail according to the embodiments described below the bio-artificial wood using the waste plastic and its manufacturing method. Like reference numerals in the drawings denote like elements.

1 is a view illustrating a bio artificial wood using waste plastics according to an embodiment of the present invention. The bio artificial wood 10 of the present invention includes a core part 11 and a core part made of a composition including waste plastic. 11) includes a cover portion 12 that is laminated to a predetermined thickness on the outer surface to produce a wood pattern.

The core portion 11 is made of a first composition comprising waste plastic powder, fibrous powder obtained from waste wood or agricultural waste, and a crosslinking agent, a dispersant, a foaming agent, a processing aid, an impact modifier, a flame retardant, and the like.

The waste plastic powder is mixed in 30 to 40% by weight of the total weight of the first composition, the fibrous powder is 50 to 60% by weight, 0.05 to 3% by weight crosslinking agent, 1 to 2% by weight dispersant, 0.05 to 0.2% by weight foaming agent It may include 3 to 5% by weight of the processing aid, 3 to 5% by weight of the impact modifier, the remaining flame retardant. Here, pine nut shell powder may be mixed for the phytoncide effect, and when the pine nut shell powder is mixed, 30 to 50% by weight of the fiber powder is mixed in a substitution form.

The waste plastic powder is a powder having a particle size of 30 to 120 mesh by washing, drying and pulverizing waste plastic discarded after use, and may be made of a resin such as PVC, PE, PP, or ABS. The use of plasticizer-free unplasticized polyvinyl chloride (uPVC) as a waste plastic has little toxicity when heated, making it an environmentally friendly artificial wood.

The fibrous powder uses a powder having a particle size of 30 to 120 mesh by washing, drying and pulverizing waste wood or agricultural waste.

The blowing agent may be a thermally expandable blowing agent shell in which a liquid low-boiling hydrocarbon is placed in a thermoplastic polymer shell. The blowing agent shell softens the polymer shell by heating, and turns the liquid hydrocarbon inside into a gas, and at a pressure thereof. It expands into a hollow molecule 50 to 100 times its volume. At this time, the foaming shell is to form an independent bubble can be reduced in weight, it provides an advantage that can minimize the moisture content. In addition, after the foaming agent shell is foamed, an independent bubble is formed to be lightweight, and the specific gravity and water content of the product can be lowered.

Processing aids assist in processing the resin component of the waste plastic powder (eg PVC resin). That is, it serves to promote melting of the resin component during foam extrusion and to maintain a uniform cell structure, and to impart viscoelasticity to the processed resin. The processing aid is preferably used having a high molecular weight, in the present invention is made by mixing 60 to 85% by weight of methyl methacrylate (MMA) and 15 to 40% by weight of butyl acrylate (Butyl Acrylate) Use it.

The dispersing agent lubricates during the extrusion foaming process so that the molten raw material can flow smoothly in the extrusion molding machine. The dispersing agent is mixed with fatty acid in addition to palmitic acid and stearic acid. Can be made.

The crosslinking agent serves to prevent uniform crosslinking by hardening a crosslinking (curing) reaction by heat during extrusion of artificial wood to form a large aggregate. In addition, the crosslinking agent also acts to prevent the degradation of physical properties even if a large amount of the main material (waste plastic powder and fiber powder) is added to obtain the texture of the wood. The crosslinking agent used in the present invention may use a conventional one known in the art.

The impact modifier is a material added to improve impact strength and formability, and is made by mixing chlorinated polyethylene, calcium carbonate, calcium stearate, talc, and the like.

The flame retardant may be a known flame retardant or the like as a component that provides fire resistance.

The cover part 12 is integrally laminated on the outer surface of the core part 11 while being extruded together with the core part 11, and the artificial wood is natural by forming a pattern of natural wood on the surface of the cover part 12. It feels like wood.

The cover part 12 is made of a second composition in the form of a master batch containing a stabilizer, a pigment, titanium dioxide (TiO ₂ ), a UV blocking agent, and an additive in a thermoplastic resin.

Figure 2 is a flow chart showing an embodiment of a method for producing a bio-artificial timber of the present invention, Figures 3 to 6 shows the configuration of the apparatus for producing a bio-artificial timber of the present invention, Figures 2 to 6 Referring to the method for producing a bio-artificial wood according to the present invention in detail as follows.

The waste plastic discarded after use is washed with water, dried and pulverized to produce waste plastic powder having a particle size of 30 to 120 mesh. Then, the waste wood or agricultural wastes are washed with water, dried and pulverized to produce a fibrous powder having a particle size of 30 to 120 mesh. The order of the steps of preparing the waste plastic powder and the fibrous powder is irrelevant, and may be made separately at a place other than the place where the extrusion molding process is performed.

The waste plastic powder is first heated, dried and melted while rotating in a temperature range of 50 to 120 ° C. to form pellets.

In addition, the fibrous powder is made in the form of pellets as it is first heated, dried and melted while rotating in a temperature range of 50 ~ 150 ℃.

Subsequently, the pellet-type waste plastic powder and the fibrous powder are added to a blender together with a crosslinking agent, a dispersing agent, a foaming agent, a processing aid, an impact modifier, a flame retardant, and the like, and heated and kneaded to a temperature range of 50 to 150 ° C. to prepare a gel-like synthetic raw material. do. At this time, the waste plastic powder 30 to 40% by weight, fibrous powder 50 to 60% by weight, crosslinking agent 0.05 to 3% by weight, dispersant 1 to 2% by weight, foaming agent 0.05 to 0.2% by weight, processing aid 3 to 5% by weight, impact It is preferable to mix with 3 to 5 weight% of reinforcing agents and the compounding ratio of remainder flame retardant.

The gel-like synthetic raw material obtained as described above is cooled in a temperature range of 30 to 80 ° C. to prepare a powdered first composition.

Subsequently, the first composition is introduced into the hopper 110 of the first extrusion molding machine 100, and is transported and melted while heating to a predetermined temperature, and then the core portion 11 is extruded through the primary die 120 at the tip. Mold. The first extrusion molding machine 100 may be applied to a twin extruder for smoothly mixing and kneading the first composition raw material while rotating two screws 130 (see FIG. 5) disposed side by side. Can be.

Since the first composition injected into the first extruder 100 includes a large amount of fiber, the molten first composition may not be smoothly transferred when the first composition is melted and transported in the first extruder 100. Can be. Accordingly, as shown in FIG. 5, the pitch of the spiral blades 132 of the pair of screws 130 for conveying the first composition in the first extruder 100 is different from each other along the front and rear directions so that the first composition is different. Can be transported smoothly. In the blade 132 of the screw 130, the blade 132 is formed as the first pitch P1 in the first region from the front end portion of the screw 130 to a predetermined distance L1 toward the rear. In the second region up to the predetermined distance L2 behind the region, the blade 132 is formed with the second pitch P2 smaller than the first pitch P1, and then the third region up to the predetermined distance L3 at the rear end portion. In FIG. 3, the third pitch P3 is larger than the first pitch P1.

As such, when the pitch of the blades 132 of the screw 130 is configured to be different for each region, the first composition is smoothly transferred while melting in the first region, and the molten first composition is formed in the middle dense second region. The components of are uniformly blended so that the defective rate is significantly lowered after the extrusion. In addition, the first composition uniformly blended in the second region is quickly conveyed backward and extruded in the third region. Therefore, there is an advantage that the density of the extrudate can be made more uniform while improving the extrusion speed.

6 and 7, the first die 120 of the first extruder 100 is provided with a cavity 121 through which the core portion 11 is extruded, and the cavity of the primary die 120 is provided. 121 is connected to the side extrusion nozzle 210 at the tip of the second extrusion molding machine 200 for forming the cover portion 12 by the secondary composition.

Therefore, the core portion 11 is extruded through the first die 120 of the first extrusion machine 100, and the second die in the master batch form is introduced into the second extrusion machine 200 to the first die. The molten second composition is supplied to the outside of the core portion 11 passing through the 120, and the cover portion 12 is laminated on the outer surface of the core portion 11 and simultaneously extruded.

At this time, the side extrusion nozzle 210 of the tip of the second extrusion molding machine 200 is preferably horizontally connected to one side of the primary die (120). In addition, a raw material supply passage communicating with the side extrusion nozzle 210 in the primary die 120 to guide the second composition in a molten state discharged through the side extrusion nozzle 210 into the cavity 121. 122 is formed.

The upper surface of the bio-artificial timber is a pattern of natural wood and exposed to the outside, so the uniformity of thickness is important. Therefore, the second composition supplied when the second extrusion molding machine 200 is connected from one side of the primary die 120 to supply the second composition is uniformly provided on the upper surface of the core part 11 in the cavity 121. Must be supplied.

To this end, the raw material supply passage 122 extends from one side of the primary die 120 to the upper side and then branches to both sides from the center of the outside of the upper surface of the cavity 121, and then both sides of the upper surface of the cavity 121. It is formed into a passage communicating with. The shape of the raw material supply passage 122 allows the second composition to be uniformly supplied to the upper surface of the core portion 11 in the cavity 121, and through the rear end portion of the cavity 121. When the laminate of the cover part 12 is extruded, the thickness of the cover part 12 may be uniformly formed as a whole.

In the first die 120 of the first extrusion molding machine 100 and the second extrusion molding machine 200, if the artificial wood semi-finished product made of a laminate of the core part 11 and the cover part 12 is extruded, the artificial wood semi-finished product Is transferred to the vacuum calibrator 300 arranged inline at the rear of the first extrusion molding machine 100.

The vacuum calibrator 300 is connected to a vacuum pump. Therefore, the vacuum calibrator 300 generates a vacuum pressure by using a vacuum pump to cool the biofinished wood semi-finished product into a final product and simultaneously supply cooling water.

Bio artificial wood molded into the final product form while passing through the vacuum calibrator 300 passes through the tensioner 400, and then passes through the embo 500, natural on the upper and lower surfaces of the cover portion 12 Wood pattern is carved. The tensioner 400 performs the function of transferring the bio-artificial wood to the front at the same pressure and force, the same speed to the rear, it is possible to apply a known tensioner used in the art. In addition, the embo 500 is provided with a pair of transfer rollers 510 to imprint the natural wood pattern on the upper surface and the lower surface of the cover portion 12 of the artificial wood.

The bio-artificial timber passing through the embo 500 is cut into a predetermined length in the cutter 600 and then sequentially loaded in the rear loader 700.

As described above, the bio-artificial timber of the present invention is a core material 11 extruded from waste plastic and a powder material made by pulverizing waste wood or agricultural waste, and a resin material laminated and laminated on the outer surface of the core part 11. It includes a cover portion 12, the core portion 11 and the cover portion 12 is produced by extrusion molding at the same time very easy to manufacture, it can be produced inexpensive bio artificial wood.

In addition, since bio-artificial wood is made by recycling waste plastics and waste wood or agricultural waste, it is possible to minimize environmental pollution and to obtain resource recycling effects.

In addition, as can be seen through the bending maximum load test report shown in Figure 8, the bio-artificial timber prototype produced by the manufacturing apparatus and method according to the present invention has a maximum bending load of 6760N, almost 2 than the KS reference strength 3400N It was confirmed that it exhibits a double maximum load, and it can be seen that the bio-artificial timber of the present invention has much superior mechanical strength as compared with the bending maximum load of conventional artificial timber is approximately 4000N-5000N.

This is achieved by melting and kneading the first composition raw material using two screws 130 having blades 132 of different pitches in the first extrusion molding machine 100, as described above. It can be impregnated smoothly, and it is analyzed that the cover part 12 is integrally extruded while being integral with the outer surface of the core part 11.

Although the present invention has been described in detail with reference to the embodiments, those skilled in the art to which the present invention pertains will be capable of various substitutions, additions, and modifications within the scope without departing from the technical spirit described above. It is to be understood that such modified embodiments also fall within the protection scope of the invention as defined by the appended claims below.

10: artificial wood 11: core part
12: cover part 100: first extrusion molding machine
110: hopper 120: primary dice
121: cavity 122: raw material supply passage
130: screw 132: blade
200: 2nd extrusion molding machine 210: side extrusion nozzle
300: vacuum calibrator 400: tensioning machine
500: M View 600: Cutter
700: Stacker

Claims (8)

delete delete A core portion 11 made of waste plastic powder, fibrous powder obtained from waste wood or agricultural waste, and a first composition comprising a crosslinking agent, a dispersant, a foaming agent, a processing aid, an impact modifier, a flame retardant; And,
The cover part is made of a second composition including a stabilizer and a pigment, a titanium dioxide (TiO ₂ ), a UV blocking agent, and an additive in the thermoplastic resin, and is laminated on the outer surface of the core part 11 to a predetermined thickness to generate a wood pattern. 12);
As a method of manufacturing a bio-artificial wood comprising a,
(S1) pulverizing the waste plastic to produce a waste plastic powder;
(S2) pulverizing waste wood or agricultural waste to produce a fibrous powder;
(S3) mixing the waste plastic powder and the fibrous powder with a crosslinking agent, a dispersant, a foaming agent, a processing aid, an impact modifier, and kneading by heating at a predetermined temperature range to prepare a gel-like synthetic raw material;
(S4) preparing a powdered first composition by cooling the gel-like synthetic raw material in a predetermined temperature range;
(S5) extrusion of the core portion 11 by inserting the first composition into the first extrusion molding machine 100;
(S6) The second composition is injected into the second extrusion molding machine 200 connected to one side of the primary die 120 of the first extrusion molding machine 100 to open the cavity 121 of the primary die 120. Supplying a second composition to an outer side of the core part 11 passing through and extruding while stacking the cover part 12;
(S7) cooling the stack of the core portion 11 and the cover portion 12 is extruded through the primary die 120;
Including,
Before performing the step (S3), the waste plastic powder and the fibrous powder are pelletized as the first heating, drying and melting while rotating in a temperature range of 50 ~ 150 ℃,
In the step (S6), the second extruder 200 is connected to the side of the primary die 120 of the first extruder 100 and passes through the cavity 121 of the primary die 120. Supplying the second composition from the side of (11) to laminate the cover portion 12 on the outer surface of the core portion 11,
The cavity of the second composition in the molten state is communicated with the side extrusion nozzle 210 provided at the tip of the second extrusion molding machine 200 and discharged through the side extrusion nozzle 210 inside the primary die 120. A raw material supply passage 122 is formed to guide inwardly, and the raw material supply passage 122 extends from one side of the primary die 120 to the upper side and then the center of the outer side of the upper surface of the cavity 121. After branching to both sides in, the manufacturing method of bio-artificial wood is formed as a flow path communicating with both sides of the upper surface of the cavity (121). The method of claim 3, wherein the waste plastic powder and the fibrous powder have a size of 30 to 120 mesh. delete The method of claim 3, wherein in the step (S7) while forming a vacuum pressure while passing the laminated body of the core portion 11 and the cover portion 12 connected to the vacuum pump 300 to form a final product form And at the same time supplying cooling water to cool the bio artificial wood. delete delete

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