KR102384851B1 - Recycled plastic manufacturing method using waste plastic and recycled plastic manufactured thereby - Google Patents

Abstract

The present invention relates to recycled plastics, and more specifically relates to a recycled plastic manufacturing method which can impart a material property improvement effect and environmentally friendly properties to recycled plastics by recycling waste plastics. The recycled plastic manufacturing method includes: a step of obtaining a mixture by mixing a waste plastic composition and a first additive composition; a step of melting and extruding the mixture; a step of cooling a resultant product after the melt extrusion; and a step of cutting the cooled product.

Description

Recycled plastic manufacturing method using waste plastic and recycled plastic manufactured thereby}

The present invention relates to recycled plastics, and more particularly, to a recycled plastic manufacturing method capable of imparting an effect of improving physical properties and environment-friendliness to a recycled plastic manufactured by recycling waste plastic.

Due to the rapid development of modern industry, the use of plastics with excellent corrosion resistance, low specific gravity, and moldability is rapidly increasing. Various blending technologies have developed various product groups with high strength, excellent corrosion resistance and chemical resistance to replace metal materials, etc. The uses are also diversifying.

However, an increase in the production of plastic products causes an increase in the amount of waste plastic waste, which in turn leads to an increase in cost and environmental pollution. Moreover, it is becoming more common to add various auxiliary materials to plastic products in order to manufacture goods with high quality and economic feasibility, making recycling of plastics more difficult. These major subsidiary materials include stabilizers, light stabilizers, antioxidants, plasticizers, processing aids, nucleating agents, fillers, flame retardants, antistatic agents, foaming agents, curing agents, crosslinking agents, colorants, antibacterial agents, conductive materials, surface hardeners, etc. are doing

As described above, while the production of plastic products is increasing, recycling is becoming difficult due to the inclusion of auxiliary materials. Therefore, the development of technology for recycling plastics (waste plastics) is required all over the world.

However, the prior art of recycling waste plastics has a problem in maintaining stable quality and functionality of recycled plastic materials. Plastic recycled according to the prior art has a problem in that the quality remains at a low level as only 50-60% of the physical property standard of the plastic raw material. In addition, during the recycling process of waste plastics, high-temperature heat treatment or chemical treatment for dissolution of components, etc. is involved. This may cause soot, fine dust, and dioxin compounds to be generated in large quantities during combustion, which is harmful to the environment and human body. There is a problem that

It is required to develop a technology that can effectively recycle waste plastics while being harmless to the human body or the environment by replacing the existing recycling method through heating or the method of pulverizing and landfilling.

Republic of Korea Patent Publication No. 10-2020-0092062

The present invention is to solve the above problems, and in the recycled plastic manufactured by recycling the waste plastic, it is an object of the present invention to provide a method for manufacturing a recycled plastic, which can provide an effect of improving physical properties and environment-friendliness.

These and other objects and advantages of the present invention will become apparent from the following description of preferred embodiments.

The object is, ABS resin, SAN resin and waste plastic composition comprising waste plastic comprising a waste synthetic resin; and a first additive composition; obtaining a mixture of; Putting the mixture into an extruder, melt-extruding while maintaining the screw rotation speed of 260 to 300rpm in a temperature range of 150 to 350 ℃; Cooling the contents obtained after melt extrusion using purified water or alkaline reduced water; and cutting the cooled contents into plastic pellets of 1 mm to 4 mm in size.

The ABS resin and the waste synthetic resin are blended in a weight ratio of 7:3 or 5:5, and the SAN resin is included in an amount of 5 to 15 parts by weight based on 100 parts by weight of the ABS (acrylonitrile butadiene styrene) resin. characterized.

The first additive composition includes an impact modifier that is an ABS dry powder containing 60% or more of butadiene rubber, and the impact modifier is included in an amount of 3 to 10 parts by weight based on 100 parts by weight of the waste plastic resin composition. do it with

The first additive composition includes a lubricant that is calcium stearate (Ca-st), magnesium stearate (Mg-st), or a mixture thereof, and the lubricant is, based on 100 parts by weight of the waste plastic resin composition, 0.1 to 1 part by weight,

Hydroxy benzophenone (Hydroxy Benzophenone) or benzotriazole (Benzotriazoles) comprising a UV stabilizer, the UV stabilizer, with respect to 100 parts by weight of the waste plastic resin composition, it is characterized in that it is included in 0.1 to 2 parts by weight.

According to the present invention, in manufacturing recycled plastics by recycling waste plastics, the effect of improving physical properties such as impact strength and melt flow index and biodegradability through the composition and process characteristics of the waste plastic resin composition and the additive composition It is possible to provide a method for manufacturing a recycled plastic that can be provided with eco-friendliness.

However, the effects of the present invention are not limited to the above-mentioned effects, and other effects not mentioned will be clearly understood by those skilled in the art from the following description.

1 is a flowchart sequentially illustrating a method for manufacturing a recycled plastic according to an embodiment of the present invention.
2 is a photograph showing steps S1, S2, and S4 (from the left) of the manufacturing method of FIG. 1, respectively.

Hereinafter, the present invention will be described in detail with reference to embodiments and drawings of the present invention. It will be apparent to those of ordinary skill in the art that these examples are merely presented by way of example to explain the present invention in more detail, and that the scope of the present invention is not limited by these examples. .

Further, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs, and in case of conflict, this specification, including definitions will take precedence.

In order to clearly explain the invention proposed in the drawings, parts irrelevant to the description are omitted, and similar reference numerals are assigned to similar parts throughout the specification. And, when a part "includes" a certain component, this means that other components may be further included, rather than excluding other components, unless otherwise stated. In addition, "unit" described in the specification means one unit or block that performs a specific function.

In each step, identification numbers (first, second, etc.) are used for convenience of description, and identification numbers do not describe the order of each step, and each step does not clearly describe a specific order in context. It may be performed differently from the order specified above. That is, each step may be performed in the same order as the specified order, may be performed substantially simultaneously, or may be performed in the reverse order.

Hereinafter, embodiments and examples of the present application will be described in detail with reference to the accompanying drawings. However, it may not be limited to these embodiments and examples and drawings of the present application.

An aspect of the present application, a waste plastic composition comprising a waste plastic comprising an ABS resin, a SAN resin and a waste synthetic resin; and a first additive composition; obtaining a mixture of; Putting the mixture into an extruder, melt-extruding while maintaining the screw rotation speed of 260 to 300rpm in a temperature range of 150 to 350 ℃; Cooling the contents obtained after melt extrusion using purified water or alkaline reduced water; and cutting the cooled contents into plastic pellets having a size of 1 mm to 4 mm.

1 is a flowchart sequentially illustrating a method for manufacturing recycled plastic according to an embodiment of the present invention, and FIG. 2 is a photograph showing steps S1, S2 and S4 of the manufacturing method of FIG. 1, respectively.

A method for manufacturing a recycled plastic using waste plastic according to an embodiment of the present application will be described with reference to FIGS. 1 and 2 .

First, in step S1, the waste plastic is plastic (or synthetic resin) collected for recycling, and may be obtained from, for example, some waste parts of electronic home appliances such as refrigerators, water purifiers, and washing machine doors.

The waste plastic includes ABS (acrylonitrile butadiene styrene) resin and SAN (styrene-acrylonitrile), for example, PC (polycarbonate), PS (polystyrene), PET (polyethylene terephthalate), poly At least one waste synthetic resin selected from the group consisting of butadiene (PB), polyamide (PA), polyphenylene sulfide (PPS), polyester (PE), polysulfone (PSF) and polyester sulfone (PESF) is further added may include

The waste plastic may be selected and pre-treated. The pretreatment may be to perform pulverization, washing and drying. Specifically, the waste plastics are sorted by grade, and in particular, with respect to plastics containing metals that may cause mechanical failure, some or all of them may be removed by using a permanent magnet or a chemical treatment method.

After sorting the waste plastic, using a crusher or a pulverizer, pulverize the waste plastic to a predetermined size, for example, 1 to 20 mm, specifically, 1 to 15 mm, more specifically, 1 to 10 mm. can get

The washing may be performed using a high-speed washing machine or a general washing machine in order to separate and remove foreign substances such as soil, sand, various metals, non-metals, etc. attached to the pulverized waste plastic.

After the washing, moisture in the waste plastic may be removed by using a centrifuge or drying may be performed to a moisture content of less than 3% using a general dryer.

Next, a mixture including the waste plastic resin composition including the pre-treated waste plastic and the first additive composition may be prepared. The first additive composition may be blended within the range of 1 to 30 parts by weight based on 100 parts by weight of the waste plastic resin composition.

<Waste plastic resin composition>

The waste plastic resin composition may include ABS (acrylonitrile butadiene styrene) resin and SAN (styrene-acrylonitrile), and may include the waste synthetic resin. For example, the waste synthetic resin may be a mixture of PC (polycarbonate), PET (polyethylene terephthalate), and PBT (polybutylene terephthalate), but is not limited thereto.

The SAN (styrene-acrylonitrile) may be included in an amount of 5 to 15 parts by weight, specifically, 5 to 10 parts by weight based on 100 parts by weight of the ABS (acrylonitrile butadiene styrene) resin. The ABS and the waste synthetic resin may be blended in a weight ratio of 7:3 to 3:7, specifically, a weight ratio of 7:3, in another example, a weight ratio of 5:5. The blending ratio in the above range may contribute to improving mechanical properties such as impact strength and melt flow index of recycled plastic to be manufactured later.

The waste plastic resin composition may further include waste paper powder. The waste paper powder means that waste paper is pulverized into fine powder, and specifically, the waste paper is a general paper type, for example, corrugated cardboard, book, newspaper, office paper of the size of A4, B4, etc. Or a combination thereof. . As an example, the waste paper may be a mixture of corrugated cardboard, office paper and newspaper.

It is preferable to adjust the size of the fine powder according to the properties of the recycled plastic to be finally manufactured in the future for the waste paper, for example, 100 to 500 mesh, for example, it is possible to form a fine powder to a size of 100 to 300 mesh. there is. In one embodiment of the present invention, by pulverizing the waste paper in the waste plastic, which is a resin and plastic formulation, and using it together, it is possible to improve the degradability.

The waste paper powder, with respect to 100 parts by weight of the waste plastic, 60 to 100 parts by weight, specifically, 75 to 95 parts by weight, for example, may be mixed in 79 parts by weight. If the content of the waste paper powder is less than 60 parts by weight, there is a disadvantage that the degradability of the produced recycled plastic product may be lowered, and if it exceeds 79 parts by weight, the content is excessive and mechanical properties may be weakened.

The waste plastic composition may include an eco-friendly binder. The eco-friendly binder helps to combine the waste plastic with the waste paper powder, and further improves the degradability of the recycled plastic later, thereby strengthening the eco-friendliness. The eco-friendly binder may use glue. The glue may be included in an amount of 50 to 70 parts by weight, for example, 70 parts by weight, based on 100 parts by weight of the waste plastic.

<First additive composition>

The first additive composition may include materials for facilitating processing of the waste plastic resin composition and improving physical properties and performance of the final product. For example, the additive composition may include at least two or more selected from the group consisting of impact modifiers, antioxidants, heat stabilizers, UV stabilizers, lubricants, dispersants, flame retardants, thermal decomposition initiators, and pigments.

The impact modifier may be any one selected from the group consisting of methyl methacrylate (MMA), butadiene rubber, ABS dry powder, or a combination thereof. For example, the impact modifier may be an ABS dry powder containing butadiene rubber, specifically, an ABS dry powder containing 60% or more of butadiene rubber, for example, 65%.

The impact modifier may be included in an amount of 3 to 10 parts by weight, specifically, 4 to 8 parts by weight, for example, 7 parts by weight, based on 100 parts by weight of the waste plastic resin composition. If the content of the impact modifier is less than 3 parts by weight, the effect of improving the impact strength may be reduced, and if it is greater than 10 parts by weight, other physical properties such as tensile strength and flexural strength may be reduced.

The antioxidant serves to protect the plastic from oxygen or ozone in the atmosphere during the production, processing, and storage of the plastic. In general, the antioxidant used in the production of plastic may be used, and the first antioxidant and the agent Mixtures of 2 antioxidants may be used.

The first antioxidant may be at least one selected from the group consisting of phenolic, monophenolic, and polymeric phenolic antioxidants. Specifically, the first antioxidant acts as an H donor or a radical scavenger to convert the unstable free radical generated by oxidation into a stable form. can The first antioxidant may be included in an amount of 0.1 to 0.2 parts by weight based on 100 parts by weight of the waste plastic resin composition. If the content of the first antioxidant is less than 0.1 parts by weight, the primary antioxidant effect may be insignificant, and if it is more than 0.2 parts by weight, it may cause a cost increase.

The second antioxidant may be thio-based, phosphorus-based, or a mixture thereof. Specifically, the second antioxidant has a property of preventing the diffusion of hydroperoxide into other types of radicals, and the second antioxidant is, based on 100 parts by weight of the waste plastic resin composition, It may be included in 0.1 to 0.2 parts by weight. If the content of the second antioxidant is less than 0.1 parts by weight, the secondary antioxidant effect may be insignificant, and if it is more than 0.2 parts by weight, it may cause a cost increase.

The lubricant may be calcium stearate (Ca-st), magnesium stearate (Mg-st), or a mixture thereof. The lubricant may be used to improve fluidity when heat-molding a thermoplastic resin. The lubricant may be included in an amount of 0.1 to 1 part by weight based on 100 parts by weight of the waste plastic resin composition.

The dispersing agent serves to assist the mixed materials to be mixed evenly and well, and a dispersing agent generally used in the manufacture of plastics may be used. The dispersant may be included in an amount of 0.1 to 1 part by weight based on 100 parts by weight of the waste plastic resin composition.

The pigment is for coloring the recycled plastic to be manufactured, and in general, a pigment that can be used in the production of plastic may be used. The pigment may be included in an amount of 0.1 to 5 parts by weight, for example, 1 to 3 parts by weight, based on 100 parts by weight of the waste plastic resin composition.

The heat stabilizer, but a heat stabilizer used in a conventional plastic manufacturing field, for example, Cd / Ba / Zn-based, Cd / Ba-based, Ba / Zn-based, Ca / Zn-based, Na / Za-based, Sn-based, Pb-based, Cd-based or Zn-based powder, liquid or paste form may be used. The heat stabilizer may be included in an amount of 0.1 to 2 parts by weight, for example, 1 to 2 parts by weight, based on 100 parts by weight of the waste plastic resin composition.

The ultraviolet stabilizer, for example, hydroxy benzophenone (Hydroxy Benzophenone) or benzotriazole (Benzotriazoles) may be used. The ultraviolet stabilizer may be included in an amount of 0.1 to 2 parts by weight, for example, 1 to 2 parts by weight, based on 100 parts by weight of the waste plastic resin composition.

The flame retardant is an additive used to improve the combustion resistance of plastics, and a flame retardant that can be generally used in the manufacture of plastics may be used. The flame retardant may be added in an amount of 1 to 10 parts by weight, preferably 5 to 10 parts by weight, based on 100 parts by weight of the waste plastic resin composition.

In addition, in an embodiment of the present invention, a drop preventing agent may be added. The anti-drop agent has a function of preventing the molten resin from falling and spreading the fire when the plastic catches fire, and the drop-preventing agent may generally be used for manufacturing plastics. In this case, the total amount of the anti-drop agent and the flame retardant may be added in an amount of 1 to 15 parts by weight, preferably 5 to 15 parts by weight, based on 100 parts by weight of the waste plastic resin composition.

The thermal decomposition initiator may control the biodegradability of plastic products by using an azo compound having an appropriate temperature range according to temperature conditions such as processing and storage. The thermal decomposition initiator may be added in an amount of 1 to 5 parts by weight, preferably 2 to 4 parts by weight, based on 100 parts by weight of the waste plastic resin composition.

The waste plastic composition and the first additive composition may be mixed with a supermixer or stirrer at 130 to 160° C. for 1 to 5 minutes to obtain the mixture to be mixed well.

<Extrusion, Second Additive Composition and Cooling>

In step S2, the mixture may be put into an extruder, and melt-extruded while maintaining a screw rotation speed of 260 to 300 rpm in a temperature range of 150 to 350°C. During the extrusion, the second additive composition may be added. The second additive may improve the kneading by reducing friction during screw rotation of the extruder, allowing smooth melt extrusion, and improving moldability.

The second additive composition may include cornstalk powder; wood meal from pine and juniper; Coconut Peel Powder; and a mixture of chalk (chalk) powder and wax. The wax may include paraffin wax, liquid paraffin wax, beeswax, molda wax, or a combination thereof. Specifically, the mixture may be uniformly dispersed during extrusion to increase moldability, and the wax may be coated on the surface of each powder of the mixture to serve as a lubricant adjuvant to improve processability.

the cornstalk powder; wood meal from pine and juniper; Coconut Peel Powder; And chalk (chalk) powder, with respect to 100 parts by weight of the waste plastic resin composition, may be formulated in an amount of 1 to 1.2 parts by weight, 1 to 1.2 parts by weight, 0.8 to 1 parts by weight, 0.6 to 0.8 parts by weight, respectively. The wax may be mixed in an amount of 3 to 5 parts by weight based on 100 parts by weight of the waste plastic resin composition.

The content obtained after the extrusion may be manufactured as recycled plastic through subsequent additional processes.

In step S3, the extruded contents may be cooled. The cooling may be performed by spraying one or more selected from air and water using a nozzle. Specifically, the cooling may be performed by spraying water using a water spray nozzle or immersing in a water tank filled with water. In this case, the water may be purified water or alkaline reduced water.

As an example, the cooling may be to immerse the extruded contents in a water tank filled with alkaline reduced water, for example, low-temperature alkaline water reduced water of 0 to 30° C., and hold for 10 to 30 minutes. In this case, a mixture of bamboo charcoal powder and diatomaceous earth powder may be included in an amount of 10 to 15 parts by weight based on 100 parts by weight of the alkaline reduced water. The bamboo charcoal powder and diatomaceous earth powder are to remove the odor of the extruded contents and to impart antibacterial properties.

In step S4, by cutting the cooled contents in the form of, for example, plastic pellets having a size of 1 mm to 4 mm, processability can be improved so that a plastic product for a necessary use can be manufactured.

Hereinafter, the configuration of the present invention and its effects will be described in more detail through specific examples and comparative examples. However, these examples are for explaining the present invention in more detail, and the scope of the present invention is not limited to these examples.

[Example 1]

Recycled plastics were manufactured according to the manufacturing method to be described later. Specific components and contents of each composition are shown in Table 1 below. The unit of each content is a part by weight based on 100 parts by weight of an ABS (acrylonitrile butadiene styrene) resin.

1. Preparation of waste plastic resin composition

Based on 100 parts by weight of ABS (acrylonitrile butadiene styrene) resin, 10 parts by weight of SAN (styrene-acrylonitrile), PC (polycarbonate), PET (polyethylene terephthalate), and PBT (Polybutylene terephthalate) waste synthetic resin that is a mixture of was mixed in 100 parts by weight to prepare a waste plastic resin composition.

2. Preparation of first additive composition

Based on 100 parts by weight of the waste plastic resin composition, 7 parts by weight of an impact modifier that is an ABS dry powder containing 65% butadiene rubber; Magnesium stearate (Mg-st) of 0.5 parts by weight; and benzotriazole, UV stabilizer, of 1 part by weight; A first additive composition comprising a was prepared.

3. Extrusion

The waste plastic resin composition and the first additive composition were put in a super mix, and the mixture mixed at 155° C. for 4 minutes was put in an extruder, and melt-extruded under the conditions of a temperature of 300° C. and a rotation speed of 300 rpm. At this time, cornstalk powder; wood meal from pine and juniper; Coconut Peel Powder; Extrusion was performed while adding a mixture of 1 part by weight, 1.1 parts by weight, 0.9 parts by weight, and 0.7 parts by weight of chalk (chalk) powder, respectively, and a second additive composition containing 5 parts by weight of paraffin wax.

4. Cooling

The extruded contents were immersed in a water bath filled with alkaline reduced water at 10° C. and maintained for 25 minutes to cool. At this time, 15 parts by weight of a mixture of bamboo charcoal powder and diatomaceous earth powder in a 1:1 ratio with respect to 100 parts by weight of alkaline reduced water was added. Thereafter, the cooled recycled plastic was cut into granules of 1 to 4 mm.

[Examples 2 to 6]

Recycled plastics were prepared in the same manner as in Example 1, except for each component of the waste plastic resin composition, the first additive composition, and the second additive composition, according to the composition of Table 1 below.

[Example 7]

A recycled plastic was manufactured according to the manufacturing method of Example 1 and the composition of Example 1 of Table 1 above, but in the step of 4. cooling, only alkaline reduced water was used, and bamboo charcoal powder and diatomaceous earth powder were not included.

[Example 8]

A recycled plastic was prepared according to the preparation method of Example 1 and the composition of Example 1 of Table 1, but in the cooling step, purified water was used instead of alkaline reduced water.

[Example 9]

Recycled plastic was manufactured according to the manufacturing method of Example 1 and the composition of Example 1 of Table 1, but in the cooling step, it was cooled using a water (purified water) spray nozzle, not immersed in a water bath.

[Experimental Example 1: Evaluation of physical properties]

For the recycled plastics prepared according to Examples 1, 4, 5, 6, and 9, physical properties were evaluated. For physical properties, impact strength, tensile strength, melt index, and flexural strength were tested, and conventionally known methods were used for each item. For a more accurate comparison, it was compared with Virgin PC-ABS resin (Cheil Industries, NH-1015T), and the results are shown in Table 2 below.

As shown in Table 2, the regenerated plastic of Example 1 according to the present invention exhibited the best evaluation in all items of tensile strength, impact strength, melt index, and flexural strength.

[Experimental Example 2: Evaluation of biodegradability]

For the recycled plastics prepared according to Examples 1 to 3, Examples 7 and 8, a test was performed in accordance with ASTM D6954-04 to evaluate biodegradability.

Each recycled plastic was prepared as a specimen of 10 mm × 10 mm × 1.5 mm, and then degradability evaluation was performed in three steps using cellulose, a standard material, as a control. In step 1, after chemical decomposition by treatment with UVA 340nm for 100 hours according to ASTM D5208-01 CYCLE A method, the biodegradation degree of the UV-treated sample was measured by the method of KSM-3100-1. The results of the biodegradability test for 45 days according to the ASTM D6954-04 method are shown in Table 3 below.

As shown in Table 3, it was confirmed that the biodegradability of the recycled plastic of Example 1 according to the present invention was the best.

In this specification, only a few examples among the various embodiments performed by the present inventors are described, but the technical spirit of the present invention is not limited or limited thereto, and it is of course that it may be modified and variously implemented by those skilled in the art.

Claims (5)

Waste plastic resin composition comprising waste plastic including acrylonitrile butadiene styrene (ABS) resin, styrene acrylonitrile (SAN) resin, and waste synthetic resin; and a first additive composition; obtaining a mixture of;
Putting the mixture into an extruder, melt-extruding while maintaining the screw rotation speed of 260 to 300rpm in a temperature range of 150 to 350 ℃;
cooling the contents obtained after melt extrusion using purified water or alkaline reduced water; and
Cutting the cooled contents into plastic pellets having a size of 1 mm to 4 mm;
The waste plastic resin composition further comprises a waste paper powder obtained by pulverizing a mixture of corrugated cardboard, office paper and newspaper into a fine powder having a size of 100 to 300 mesh, and an eco-friendly binder that is a glue,
The acrylonitrile butadiene styrene (ABS) resin and the waste synthetic resin are mixed in a weight ratio of 7:3 or 5:5,
The styrene acrylonitrile (SAN) resin is characterized in that it is included in an amount of 5 to 15 parts by weight based on 100 parts by weight of the acrylonitrile butadiene styrene (ABS) resin,
The first additive composition includes an impact modifier that is an acrylonitrile butadiene styrene (ABS) dry powder containing butadiene rubber in an amount of 60% or more, and the impact modifier is 3 to 100 parts by weight of the waste plastic resin composition It is characterized in that it is included in 10 parts by weight,
The first additive composition includes a lubricant that is calcium stearate (Ca-st), magnesium stearate (Mg-st), or a mixture thereof, and the lubricant is, based on 100 parts by weight of the waste plastic resin composition, 0.1 to 1 part by weight,
Hydroxy benzophenone (Hydroxy Benzophenone) or benzotriazole (Benzotriazoles) comprising a UV stabilizer, the UV stabilizer, with respect to 100 parts by weight of the waste plastic resin composition, 0.1 to 2 parts by weight, characterized in that,
In the melt extrusion step, a second additive composition is added, which reduces friction during screw rotation of the extruder to improve kneading and smooth melt extrusion to increase moldability,
The second additive composition may include cornstalk powder; wood meal from pine and juniper; Coconut Peel Powder; and a mixture of chalk (chalk) powder and wax,
Based on 100 parts by weight of the waste plastic resin composition, 1 part by weight of the cornstalk powder, 1.1 parts by weight of the wood flour of pine and juniper, 0.9 parts by weight of the coconut skin powder, and 0.7 parts by weight of the chalk (chalk) powder, The wax is characterized in that it is included in 5 parts by weight,
In the cooling step, the cooling is to fill the water bath with the alkali reduced water at 10 ° C., immerse the contents obtained after the melt extrusion and hold for 25 minutes,
In order to remove odor and impart antibacterial properties to the contents obtained after melt extrusion, a mixture of bamboo charcoal powder and diatomaceous earth powder in a weight ratio of 1:1 is added to a water tank, but the mixture is 100 parts by weight of alkaline reduced water A method for producing recycled plastic, characterized in that silver is added in an amount of 15 parts by weight. delete delete delete delete

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