KR20240044734A - Method for preparing recycled polyolefin resin - Google Patents

Abstract

The present invention provides a method for producing PO recycled resin from which odor is removed without deterioration of physical properties, which method includes polyolefin (PO) based resin, ricinoleic acid metal salt as an additive for removing odor, and primary linear alcohol as an auxiliary additive. Preparing an extrusion feed comprising: and supplying the extrusion feed to an extruder for extrusion, wherein the content of the ricinoleic acid metal salt in the extrusion feed is 0.1 to 100 parts by weight based on 100 parts by weight of the base resin. 0.5 parts by weight, and the weight ratio of ricinoleic acid metal salt and linear primary alcohol contained in the extrusion feed is 1:1 to 1:4.

Description

Method for producing polyolefin recycled resin {METHOD FOR PREPARING RECYCLED POLYOLEFIN RESIN}

The present invention relates to a method for producing recycled resin, particularly polyolefin recycled resin, in which deterioration of physical properties is suppressed while removing bad odor.

Recently, as plastics with physical properties required for various uses and purposes have been developed, the use of plastics is increasing. In general, plastic uses a lot of energy from crude oil extraction to manufacturing, and a large amount of carbon is emitted in the process. Furthermore, when the plastic contained in the product is discarded along with the disposal of the final product, environmental pollution caused by plastic and social costs for its disposal are incurred. Accordingly, recycling of discarded plastics is essential in order to reduce energy use, reduce carbon emissions, and prevent environmental pollution. In this way, plastic made by recycling plastic discarded after use by the end consumer is called PCR (post-consumer recycled) resin, and attempts and efforts to obtain PCR resin with desired purity and physical properties continue. It is being done.

Meanwhile, polyolefin (PO) resin is a thermoplastic polymer manufactured by polymerizing olefins (hydrocarbons containing one double bond per molecule) such as ethylene and propylene. It exhibits different properties depending on density, making a variety of products based on density. It is used as a raw material. For example, high density polyethylene (HDPE) exhibits plasticity, rigidity, and uniformity, while low density exhibits liquid or rubber-like elasticity, transparency, and flexibility. Low density polyethylene (LDPE) is mainly used in products requiring high strength, low density polyethylene (LDPE) is used in products requiring high transparency, and linear low density polyethylene (LLDPE) is mainly used in film production due to its excellent formability. These polyolefin resins are widely used commercially due to their low price, and account for a significant portion of the waste plastic currently generated.

Generally, methods for recycling waste plastic (resin) include mechanical recycling, chemical recycling, and thermal recycling. Mechanical recycling is a method of crushing and sorting the collected waste plastic, separating the waste plastic by type, and manufacturing resin products by mixing it with new material at a certain ratio or reinforcing functional additives when melting and pelletizing the waste plastic using an extruder. Chemical recycling is a method of extracting only specific polymers from waste plastic using various chemical means or recovering them as pure single molecules and repolymerizing them. Thermal recycling is a method of burning waste plastic and recovering it as heat energy.

When processing waste polyolefin resin by the mechanical recycling method, if foreign substances are included, oxidation of the foreign substances occurs during the melting process using an extruder, causing an unpleasant odor of unknown origin. In particular, agricultural mulching film not only contains a lot of various foreign substances such as soil, straw, and paper, but also involves a fermentation process due to the nature of its use, causing serious odor during the pelletizing process.

Accordingly, methods of using additives such as zeolite-based materials or zinc ricinoleate, which are known to have the ability to remove odors or TVOC (total volatile organic compounds) in the process of recycling waste polyolefin resin, are being attempted. However, most of these additives are highly polar substances and have poor miscibility with the resin. As a result, if an excessive amount of additives is added, a phase may be formed within the matrix resin, and the introduction of components with different polarity is not recommended. It acts as a defect site for the matrix resin, which can eventually lead to a decrease in physical properties such as impact strength and transmittance of the resin.

Therefore, there is a need for a technology that can prevent deterioration of physical properties while removing bad odor during recycling of waste polyolefin resin, such as agricultural mulching film.

Republic of Korea Patent No. 10-1985542 Gazette

The problem to be solved by the present invention is to eliminate bad odors caused by various causes during the production process of PCR (post-consumer recycled)-PO (polyolefin) in order to solve the problems mentioned in the background technology of the above invention. The aim is to provide a method for producing PO regenerated resin that can suppress deterioration of physical properties.

That is, the purpose of the present invention is to provide a method for producing PO recycled resin that can suppress the deterioration of the physical properties of the base resin due to additives used to remove odor when producing PO recycled resin from PO base resin through an extruder. Do it as

According to an embodiment of the present invention to solve the above problem, an extrusion feed containing a polyolefin (PO)-based resin, a metal salt of ricinoleic acid as an additive for removing odor, and a primary linear alcohol as an auxiliary additive is prepared. and supplying the extrusion feed to an extruder for extrusion, wherein the content of the ricinoleic acid metal salt in the extrusion feed is 0.1 to 0.5 parts by weight based on 100 parts by weight of the base resin, and the extrusion A method for producing PO regenerated resin is provided wherein the weight ratio of ricinoleic acid metal salt and linear primary alcohol contained in the feed is 1:1 to 1:4.

According to the method for producing a PO regenerated resin of the present invention, by using ricinoleic acid metal salt as an additive for removing odor and a primary linear alcohol as an auxiliary additive for the PO-based resin in the extrusion feed, the physical properties of the PO-based resin are improved. The amount of ricinoleic acid metal salt used, which may cause degradation, can be reduced to 0.1 to 0.5 parts by weight based on 100 parts by weight of the base resin.

Furthermore, by adjusting the weight ratio of ricinoleic acid metal salt and primary linear alcohol contained in the extrusion feed to a predetermined range of 1:1 to 1:4, it is possible to suppress deterioration of the physical properties of the PO resin and achieve an excellent odor removal effect. .

Terms or words used in the description and claims of the present invention should not be construed as limited to their usual or dictionary meanings, and the inventor should appropriately use the concepts of terms to explain his invention in the best way. Based on the principle of definability, it must be interpreted with meaning and concept consistent with the technical idea of the present invention.

In the present invention, polyolefin (PO) resin is a concept that collectively refers to not only homopolymers, copolymers, and/or block (co)polymers containing monomers of ethylene and/or propylene, but also compositions containing these polymers.

Meanwhile, in the present invention, the PO-based resin is a PO resin that has been separated and recovered from a discarded product and pretreated, and may contain impurities or foreign substances, and the resin prepared from the PO-based resin by the recycled resin manufacturing method of the present invention is PO recycled. Defined as resin. Furthermore, in order to apply the PO recycled resin to products, PO resin mixed with PO recycled resin and new material or with additives added to give desired physical properties is called PCR-PO resin (Post Consumer Recycled-PO resin). ).

Hereinafter, the present invention will be described in more detail to facilitate understanding of the present invention.

A method for producing a PO regenerated resin according to an embodiment of the present invention includes preparing an extrusion feed comprising a PO-based resin, a metal salt of ricinoleic acid as an additive for removing malodor, and a primary linear alcohol as an auxiliary additive, and the extrusion process. It may include supplying the feed to an extruder and extruding it.

The PO-based resin may be selected from the group including homopolymers, copolymers, and/or block (co)polymers containing monomers of ethylene and/or propylene, and may be used separately depending on density. For example, HDPE (high-density polyethylene), MDPE (medium-density polyethylene), LDPE (low-density polyethylene), LLDPE (linear low-density polyethylene), and VLDPE (very low-density polyethylene) can be appropriately selected and used depending on the characteristics of the product. In particular, low-density polyethylene resin (LDPE), linear low-density polyethylene resin (LLDPE), or mixtures thereof with excellent transparency and moldability are used as agricultural mulching films for effective weed, moisture, and temperature management in the soil. You can. This agricultural mulching film made of polyethylene needs to be collected after crop harvest. The collected waste plastic resin requires pretreatment processes such as washing and grinding to be used to produce PCR-PO resin for recycling.

In other words, the PO-based resin is a resin required to be supplied to the extruder. For example, it may be a resin in the form of flakes or particles (pellets or fine powder) having an appropriate size from which large-sized foreign substances have been separated and removed. For example, the PO-based resin may be flakes or particles with an average particle diameter of 4 to 10 mm, specifically 5 to 8 mm, and when the average particle diameter range is satisfied, supply to the extruder can proceed smoothly in the subsequent process. .

Specifically, to prepare a PO-based resin, waste products containing waste PO resin can first be dismantled to separate the waste PO resin, and then washed and crushed. At this time, methods such as separation methods using wet or dry specific gravity, screening and classification methods using near-infrared spectroscopy, and electrostatic separation using electrostatic properties can be used to separate the waste PO resin. Foreign substances other than the resin, such as metal components or fiber components, can first be separated from the pulverized waste PO resin. For this, magnetic force or the difference in specific gravity of the materials can be used. Through this, large foreign substances in the waste resin are removed and the overall foreign matter content is reduced.

Thereafter, if necessary, the waste PO resin from which large foreign substances have been removed can be pulverized into fine powder or flakes. For the crushing, crushing devices such as jaw crushers, impact crushers, cross jet mills, roller mills, and rod mills can be used. Meanwhile, the waste PO resin after pulverization may still contain some foreign substances. Furthermore, in order to remove the fine foreign substances contained in the pulverized waste PO resin, the fine foreign substances can be separated and removed using equipment that utilizes, for example, magnetic force, wind power, centrifugal force, gravity, etc.

Meanwhile, each process exemplified as pretreatment of waste PO can be appropriately selected and modified as needed, and is not particularly limited as long as it is a means of providing PO-based resin in an appropriate state to be supplied to the extruder.

The PO-based resin may contain trace amounts of foreign matter even if it undergoes the above pretreatment. In particular, in the case of resin recovered from agricultural mulching film, due to the nature of its use, a fermentation process is involved, which may cause bad odor.

Therefore, the PO-based resin recovered from agricultural mulching film is added with an odor remover such as ricinoleic acid metal salt during the melting process using an extruder.

As shown below, the ricinoleic acid metal salt has a structure of Me(Ri) ₂ in which a metal component forms a coordination bond between two ricinoleic acid (Ri) molecules, and has selectivity for sulfur and nitrogen compounds. It is known to be excellent at removing foul-smelling sulfur and nitrogen compounds through chemical adsorption.

Conventionally, about 1.5 to 3% by weight of an odor remover was used as an additive in the extrusion composition to remove harmful substances from the PCR-PO resin. In this case, the additive is dispersed in the matrix resin to achieve an odor removal effect, but due to low compatibility between the additive and the matrix resin, the inherent physical properties of the resin, such as impact strength and transmittance, are impeded, making recycling into agricultural film difficult. It can be difficult.

For example, when an agricultural film is used to grow crops, water droplets form on the surface of the film due to moisture evaporation from the soil. When the sunlight needed for crop growth is not transmitted by the water droplets on the film and is scattered, lowering the transmittance. Problems arise with the growth of crops. Therefore, since agricultural films must secure water strength and excellent sunlight transmittance for plant growth, it is necessary to suppress the inhibition of the intrinsic physical properties of the resin due to the use of odor removers.

Accordingly, in the present invention, ricinoleic acid metal salt and primary linear alcohol as an auxiliary additive are used together as an additive for removing malodor for PO-based resin in the extrusion feed.

That is, in the PO resin regeneration method according to the present invention, an extrusion feed containing PO-based resin, ricinoleic acid metal salt as an additive for removing odor, and primary linear alcohol as an auxiliary additive is prepared, and the primary linear alcohol is further used. Therefore, even if a small amount of the ricinoleic acid metal salt is used, an excellent odor removal effect can be achieved.

The primary linear alcohol has a structure in which one -OH group exists at the end of the linear chain, and does not have a complex structure such as branched structure, so it has little effect on the physical properties of the resin to be mixed, and the -OH functional group contained in the alcohol Can capture molecules that cause odor in the resin. Primary linear alcohols with these characteristics can increase the malodor removal effect of the ricinoleic acid metal salt while reducing the degradation of the resin's intrinsic physical properties when dispersed in a PO-based resin.

Specifically, the content of the ricinoleic acid metal salt in the extrusion feed may range from 0.1 to 0.5 parts by weight, specifically 0.2 to 0.4 parts by weight, based on 100 parts by weight of the base resin. If the content of the ricinoleic acid metal salt is less than 0.1 part by weight, bad odor removal may be insufficient. On the other hand, when the content of the ricinoleic acid metal salt exceeds 0.5 parts by weight, the dispersion stability of the ricinoleic acid metal salt becomes poor due to low compatibility between the ricinoleic acid metal salt and the PO-based resin, which causes the inside of the PO-based resin A phase of metal salts is formed, affecting the crystallinity of the resin, and the introduction of components of different polarity acts as a defect site in the PO resin, reducing physical properties such as impact strength and transmittance of the resin. It can be.

In addition, the weight ratio of ricinoleic acid metal salt and linear primary alcohol contained in the extrusion feed is 1:1 to 1:4 or 1:1 to 1:3. If the linear primary alcohol is used in less amount than the ricinoleic acid metal salt, the effect of mixing with the ricinoleic acid metal salt as described above may be low, and thus odor removal may be insufficient. On the other hand, when the linear primary alcohol is used in an amount exceeding 4 times that of the ricinoleic acid metal salt, the dispersion stability, such as agglomeration occurs when dispersed in the PO-based resin, becomes poor, reducing the impact strength and transmittance of the PO-based resin. Physical properties such as etc. may be reduced. Additionally, oxidation of the alcohol itself may occur due to heat during the extrusion process, which may cause new odors.

In one embodiment of the present invention, the ricinoleic acid metal salt may include zinc ricinoleate, and the zinc ricinoleate is prepared through a catalytic reaction of water, zinc oxide, and castor oil, or is commercially available. You can use what is available. Additionally, ricinoleic acid metal salt can be used as a spherical powder with an average particle diameter of 1 to 50 ㎛ and 1 to 20 ㎛. As the average particle diameter becomes smaller, the surface area increases, thereby improving malodor removal efficiency.

In one embodiment of the present invention, the linear primary alcohol may include hexanol, polyethylene glycol (PEG), stearyl alcohol, or a mixture thereof.

If desired, the extrusion feed may further include a surfactant, such as an ionic, non-ionic, or amphoteric surfactant, to improve compatibility of the PO-based resin with the components added for odor removal purposes. .

As described above, the extrusion feed comprising the PO-based resin, ricinoleic acid metal salt, and primary linear alcohol may be fed to the feed port of the extruder in the form of one composition, and one or more of the components contained in the extrusion feed may be added. Can be supplied through a separate supply line.

A method for producing PO recycled resin according to an embodiment of the present invention includes supplying the extrusion feed to an extruder and extruding it.

The extruder not only has the function of melting and kneading and extruding the PO-based resin, but also performs the function of uniformly dispersing ricinoleic acid metal salt and primary linear alcohol in the PO-based resin. Specifically, the extruder may be a twin-screw type extruder.

On the other hand, the extruder according to an embodiment of the present invention has a supply port through which the extrusion feed is supplied, an outlet located at the other end of the supply port through which the extrudate is discharged, and extrusion of the extrusion feed is performed within the housing of the extruder. It may include a cylinder, a screw located inside the cylinder and rotating to push the extrusion feed or extrudate toward the outlet, and a heating device provided outside the cylinder to heat the cylinder.

The temperature inside the extruder may be 150 to 200 °C, and more specifically, 150 to 190 °C. In the case of an extruder having a cylinder inside the extruder housing, the temperature inside the extruder may mean the internal temperature of the cylinder. The temperature range inside the extruder as above is above the melting point and below the deterioration temperature of the PO-based resin. However, the above temperature range is higher than the extrusion temperature for producing conventional PO recycled resin. If the PO-based resin stays for a long time in an extruder in this temperature range, heat-induced deterioration and discoloration of the PO-based resin are likely to occur, which directly leads to a decrease in the physical properties of the PO recycled resin. Furthermore, if the reaction feed remains in the extruder for a long time, the amount of ricinoleic acid metal salt deactivated by heat increases and the amount of linear alcohol vaporized also increases, resulting in a decrease in odor removal efficiency. Therefore, when maintaining the temperature inside the extruder in the range of 130 to 200 ℃, it is important to minimize side effects caused by heat by shortening the residence time of the extrusion feed in the extruder, and despite the short time, the odor removal effect can be maintained to the desired level. In order to perform this, the use of ricinoleic acid metal salt and primary linear alcohol becomes essential.

According to the method for producing PO recycled resin of the present invention, the residence time of the extrusion feed in the extruder may be 0.5 to 10 minutes, specifically 1 to 5 minutes. Here, the residence time may refer to the time during which the odor of the PO-based resin is removed by ricinoleic acid metal salt and primary linear alcohol in the extruder.

Through this short residence time, the exposure time to the heat of the PO base resin, ricinoleic acid metal salt, and primary linear alcohol supplied to the extruder is minimized, thereby preventing deterioration of physical properties such as discoloration of the PO regenerated resin due to heat and deterioration of the ricinoleic acid metal salt. It is possible to prevent a decrease in activity and a decrease in reaction efficiency due to excessive vaporization of primary linear alcohol.

Meanwhile, the pressure inside the extruder according to an embodiment of the present invention may be from normal pressure to 100 bar or less. In the above pressure range, it is easy to control the temperature inside the extruder, and melting and kneading of the PO-based resin can be preferably performed.

According to one embodiment of the present invention, the extruded composition discharged from the extruder may be supplied to a pelletizer and pelletized. For example, the extruded composition discharged through the outlet of the extruder is molded to a desired size through an underwater pelletizer and cooled, thereby finally producing PO recycled resin.

As described above, according to the present invention, by using ricinoleic acid metal salt as an additive for removing odors and primary linear alcohol as an auxiliary additive for PO-based resin during the production of PO regenerated resin, the physical properties of the PO-based resin are improved. The amount of ricinoleic acid metal salt used, which may cause degradation, can be reduced to 0.1 to 0.5 parts by weight based on 100 parts by weight of the base resin. In addition, by adjusting the weight ratio of the ricinoleic acid metal salt and the primary linear alcohol within a predetermined range of 1:1 to 1:4, it is possible to suppress deterioration of the physical properties of the PO regenerated resin and achieve an excellent odor removal effect.

For example, when referring to the Examples and Experimental Examples section of the present application, the content of ricinoleic acid metal salt is 0.1 to 0.5 parts by weight based on 100 parts by weight of PO-based resin, and the weight ratio of ricinoleic acid metal salt and linear primary alcohol is 1. The PO recycled resin manufactured by extruding the extrusion feed satisfying the range of :1 to 1:4 in an extruder received a high score in the odor test, and it was confirmed that the decline in drop impact strength among the intrinsic physical properties was suppressed. Additionally, as the drop impact strength of the resin is suppressed, the transmittance of the resin can also be suppressed.

Hereinafter, the present invention will be described in more detail through examples. However, the following examples are intended to illustrate the present invention, and it is obvious to those skilled in the art that various changes and modifications are possible within the scope and spirit of the present invention, and the scope of the present invention is not limited to these alone.

[Example]

Example 1

Waste PO resin recovered from agricultural mulching film was crushed and classified, large-sized foreign substances were separated and removed in the process, and then pulverized to prepare PO-based resin in the form of pellets with an average particle diameter (D50) of 4 mm. 100 kg of the PO-based resin, 30 g of zinc ricinoleate as a ricinoleic acid metal salt, and 600 g of hexanol as a linear primary alcohol were fed into a mixer and mixed to prepare an extrusion feed, which was fed through the extruder feed port. It was supplied to the extruder through.

As the extruder, a twin-screw type extruder was used, which included a cylinder with an internal diameter of 25 mm and a screw length of 800 mm.

The internal temperature of the extruder started from 150°C in the hopper and was sequentially raised to 190°C in the die. At the same time, melt-kneading of the PO-based resin was performed in the extruder and the odor generated from the PO-based resin was removed. Removal was performed.

At this time, the rotation speed of the screw was set to 300 rpm and the residence time was controlled to 120 seconds, and after reaction extrusion, the extruded composition was discharged through the outlet of the extruder. The extruded composition was supplied to a pelletizer to prepare PO recycled resin with an average diameter of 2 mm.

Examples 2 to 9 and Comparative Examples 1 to 111

A PO recycled resin was prepared in the same manner as in Example 1, except that the content of zinc ricinoleate and the type and content of linear primary alcohol were changed to those shown in Table 1 below.

In addition to hexanol, polyethylene glycol (PEG 200) and stearyl alcohol were used as the linear primary alcohol.

Experiment example:

The drop impact strength of the PO recycled resin prepared in the above Examples and Comparative Examples was evaluated by measuring and evaluating the drop impact strength using the smell test and intrinsic physical properties in the following manner, and the results are shown in Table 1 below.

<Smell test>

PO regenerated resin was provided to 50 panelists, and scores were given on a scale of 0 to 10, with the closer the smell was, the closer it was to "0", and the closer it was to no smell, the closer it was to "10". The average value of the scores received from the 50 panelists was calculated.

<Drop impact strength>

After forming a 50㎛ thick film using PO recycled resin, a dart drop impact test was performed according to ASTM D1709 standards.

Composition (unit: parts by weight) Physical property evaluation PO base resin
(LLDPE pellets) Ricinoleic acid metal salt
(Zn(Ri) ₂ ) linear primary alcohol Zn(Ri) ₂ : Alcohol smell
test
(1~10) fall
impact strength
(g) Hexanol PEG 200 Stearyl Alcohol Comparative Example 1 100 - - - - - One 203 Comparative example 2 100 0.1 - - - - 3.8 184 Comparative example 3 100 0.3 - - - - 7.1 178 Comparative example 4 100 0.5 - - - - 7.2 174 Comparative Example 5 100 0.7 - - - - 7.5 155 Comparative Example 6 100 0.3 0.15 - - 1:0.5 5.4 179 Example 1 100 0.3 0.3 - - 1:1 7.5 177 Example 2 100 0.3 0.8 - - 1:2.7 8.2 174 Example 3 100 0.3 1.2 - - 1:4 8.8 173 Comparative Example 7 100 0.3 1.5 - - 1:5 7.7 149 Comparative example 8 100 0.3 - 0.15 - 1:0.5 6.1 180 Example 4 100 0.3 - 0.3 - 1:1 7.8 178 Example 5 100 0.3 - 0.8 - 1:2.7 8.6 176 Example 6 100 0.3 - 1.2 - 1:4 9.1 175 Comparative Example 9 100 0.3 - 1.5 - 1:5 7.9 151 Comparative Example 10 100 0.3 - - 0.15 1:0.5 5.7 178 Example 7 100 0.3 - - 0.3 1:1 7.9 176 Example 8 100 0.3 - - 0.8 1:2.7 8.7 174 Example 9 100 0.3 - - 1.2 1:4 9.5 172 Comparative Example 11 100 0.3 - - 1.5 1:5 8.2 145

In Table 1, Examples 1 to 9 have a zinc ricinoleate content of 0.3 parts by weight based on 100 parts by weight of PO-based resin in the extrusion feed, and a weight ratio of linear primary alcohol to zinc ricinoleate of 1. As it satisfies the range of :1 to 1:4, it can be confirmed that the PO recycled resin received a high score close to 10 in the odor test and that the decrease in drop impact strength was suppressed.

On the other hand, Comparative Example 1 had a high drop impact strength as it did not use an odor remover, but received a very low score of 1 in the odor test.

Comparative Examples 2 to 5 used only zinc ricinoleate for the purpose of removing odor, and it can be seen that the drop impact strength decreases as the content of zinc ricinoleate increases.

Comparative Examples 6, 8, and 10 used hexanol, PEG200, or stearyl alcohol as the linear primary alcohol along with zinc ricinoleate, but the smell test was conducted as the linear primary alcohol was used at half the level of zinc ricinoleate. It received a relatively low score of 5.4 points.

Meanwhile, in Comparative Examples 7, 9, and 11, it can be seen that the drop impact strength worsens as linear primary alcohol is used at a high content of 1:5 by weight compared to zinc ricinoleate. In addition, in the odor test, as the alcohol component is oxidized by heat during the extrusion process and causes a new odor, the odor removal efficiency is lower than when the weight ratio of zinc ricinoleate and linear primary alcohol is 1:2.7 and 1:4. decreased.

As described above, when the content of zinc ricinoleate is 0.3 parts by weight, the weight ratio of linear primary alcohol to zinc ricinoleate is adjusted to a certain range of 1:1 to 1:4, which reduces the physical properties of the PO resin. It was confirmed that excellent odor removal effects can be achieved while suppressing odor.

Claims (10)

Preparing an extrusion feed comprising a polyolefin (PO) based resin, ricinoleic acid metal salt as an odor removal additive and a primary linear alcohol as an auxiliary additive, and
Comprising the step of supplying the extrusion feed to an extruder and extruding it,
The content of the ricinoleic acid metal salt in the extrusion feed is 0.1 to 0.5 parts by weight based on 100 parts by weight of the base resin,
A method for producing a PO recycled resin, wherein the weight ratio of ricinoleic acid metal salt and linear primary alcohol contained in the extrusion feed is 1:1 to 1:4. According to paragraph 1,
The PO-based resin is a method of producing a PO recycled resin, wherein the PO-based resin is a polyethylene resin. According to paragraph 2,
The polyethylene resin is selected from low-density polyethylene resin (LDPE), linear low-density polyethylene resin (LLDPE), or mixtures thereof. According to paragraph 1,
A method for producing a PO recycled resin in which the PO-based resin is pulverized into flakes or particles with an average particle diameter of 4 to 10 mm. According to paragraph 1,
The ricinoleic acid metal salt is a method of producing a PO recycled resin containing zinc ricinoleate. According to paragraph 1,
A method of producing a PO regenerated resin in which the ricinoleic acid metal salt is used as a spherical powder with an average particle diameter of 1 to 50 ㎛. According to paragraph 1,
A method of producing a PO recycled resin wherein the linear primary alcohol includes hexanol, polyethylene glycol (PEG), stearyl alcohol, or a mixture thereof. According to paragraph 1,
A method for producing PO recycled resin, wherein the temperature inside the extruder is 150 to 200 ℃. According to paragraph 1,
A method for producing a PO recycled resin, wherein the residence time of the extrusion feed in the extruder is 0.5 to 10 minutes. According to paragraph 1,
After the extrusion step, the method for producing a PO recycled resin further includes the step of supplying the extruded composition discharged from the extruder to a pelletizer to pelletize it.