KR102465946B1 - Eco-friendly antibacterial zipper bag - Google Patents

Abstract

Disclosed is a content which relates to a cost-saving, environmentally friendly, and eco-friendly antibacterial zipper bag by upcycling a discarded waste resource such as waste vinyl or a waste PET bottle as a material for a zipper bag. The present eco-friendly antibacterial zipper bag may comprise: an inner layer composed of 50 to 70 wt% of recycled polyethylene resin, 20 to 40 wt% of polyethylene resin, and 0.1 to 10 wt% of an antimicrobial agent; and an outer layer laminated on the upper surface and the lower surface of the inner layer, respectively, and formed of a crystalline recycled polyethylene resin.

Description

Eco-friendly antibacterial zipper bag {ECO-FRIENDLY ANTIBACTERIAL ZIPPER BAG}

The disclosure herein relates to an eco-friendly antibacterial zipper bag.

Unless otherwise indicated herein, material described in this section is not prior art to the claims in this application, and inclusion in this section is not an admission that it is prior art.

In general, vinyl, which we use throughout our daily lives, is made of polyethylene (PE), a type of plastic made by processing petroleum. Because of its non-mixing nature, vinyl contaminates soil and generates environmental hormones when buried in the ground. When it is burned and destroyed, it generates carcinogens called dioxins, which become the main culprit of environmental pollution.

On the other hand, with the increase in non-face-to-face consumption due to the outbreak of Corona 19, the use of courier and delivery food sharply increased from 33% to 52%, raising concerns about plastic waste used as internal and external packaging materials. Waste vinyl is a waste that even recycling companies are reluctant to recycle, and its value as a resource is close to 0 because it cannot be recycled due to its high pollution rate.

Therefore, we are focusing on research and development on ways to recycle the vast amount of vinyl used in courier and delivery food.

As part of such research and development, Patent Document 1 discloses resin pellets having degradability capable of being degraded by microorganisms present in the soil by forming resin pellets containing corn starch as a main component and then mixing them with polyethylene, and a method for manufacturing the same. And a technology for a molded article using the same is disclosed, and Patent Document 2 discloses a technology for a plastic bag using a recycled PET bottle to which a resin chemically recycled from a recycled PET bottle is applied.

In Patent Document 1 and Patent Document 2, the specific gravity of the polyethylene resin is higher than that of the recycled resin, and when the specific gravity of the recycled resin is increased, the tensile strength and the elongation rate may deteriorate.

Republic of Korea Patent No. 10-1143965 (2012.05.02) Republic of Korea Patent No. 10-1882624 (2018.07.20)

It is intended to provide an eco-friendly antibacterial zipper bag using waste resources capable of securing high strength while increasing the specific gravity of recycled polyethylene resin.

In addition, it is not limited to the technical problems as described above, and it is obvious that other technical problems may be derived from the following description.

According to one embodiment of the disclosed contents, an eco-friendly antibacterial zipper bag is laminated on an inner layer composed of 50 to 70% by weight of recycled polyethylene resin, 20 to 40% by weight of polyethylene resin, and 0.1 to 10% by weight of an antibacterial agent and the upper and lower surfaces of the inner layer, respectively. and an outer layer formed of crystalline recycled polyethylene resin.

According to another embodiment of the disclosed subject matter, it includes 25 to 35% by weight of a recycled polyethylene resin, 20 to 40% by weight of a polyethylene resin, 25 to 35% by weight of a crystalline recycled polyethylene resin, and 0.1 to 10% by weight of an antimicrobial agent.

According to one embodiment disclosed herein, the eco-friendly antibacterial zipper bag has a cost-saving and environmentally friendly effect by upcycling discarded waste resources such as waste vinyl or waste PET bottles as a material for the zipper bag.

In addition, by forming a laminated structure of an inner layer and an outer layer, there is an effect of satisfying tensile strength of 12 MPa or more and tensile elongation of 150% or more.

In addition, the sterilization function is improved by adding an antibacterial agent, and when used as a food packaging material, there is an effect of delaying food spoilage.

1 and 2 are schematic views showing an eco-friendly antibacterial zipper bag according to an embodiment of the content disclosed herein.
3 is a AA′ cross-sectional view of FIG. 1 .
4 is an enlarged cross-sectional view of an eco-friendly antibacterial zipper bag according to an embodiment of the present specification.
5 is an enlarged cross-sectional view of an eco-friendly antibacterial zipper bag according to another embodiment of the present specification.

Advantages and features of the present invention, and methods for achieving them, will become clear with reference to the embodiments described below in detail in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, and only the present embodiments make the disclosure of the present invention complete, and common knowledge in the art to which the present invention belongs It is provided to fully inform the holder of the scope of the invention, and the present invention is only defined by the scope of the claims. Like reference numerals designate like elements throughout the specification.

In describing the embodiments of the present invention, if it is determined that a detailed description of a known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description will be omitted. In addition, terms to be described below are terms defined in consideration of functions in the embodiments of the present invention, which may vary according to the intention or custom of a user or operator. Therefore, the definition should be made based on the contents throughout this specification.

1 and 2 are schematic diagrams showing an eco-friendly antibacterial zipper bag according to an embodiment of the disclosure disclosed herein, Figure 3 is a cross-sectional view taken along line AA' of FIG. 1, and FIG. 4 is an eco-friendly antibacterial zipper bag according to an embodiment of the present specification. is an enlarged cross-sectional view of

1 to 4, the eco-friendly antibacterial zipper bag 100 disclosed herein includes an inner layer 10 and an outer layer 20 laminated on the upper and lower surfaces of the inner layer 10, respectively, and has a thickness of 30 to 500 μm. This eco-friendly antibacterial zipper bag 100 can be used for delivery as well as for food.

On the other hand, the tensile strength of the eco-friendly antibacterial zipper bag 100 is 12 MPa or more, preferably 12 to 20 MPa, and the tensile elongation may be 150% or more, preferably 150 to 200%, and the eco-friendly antibacterial zipper bag according to this embodiment The lead elution amount measured after immersing (100) in water is 1 mg/L or less, preferably 0.01 to 1 mg/L, and the potassium permanganate elution amount is 10 mg/L or less, preferably 0.01 to 10 mg/L.

The inner layer 10 is made of 50 to 70% by weight of recycled polyethylene resin, 20 to 40% by weight of polyethylene resin, and 0.1 to 10% by weight of an antibacterial agent, and the thickness of the inner layer 10 does not exceed 90% of the total thickness. , preferably in the range of 50 to 90%. If the thickness of the inner layer 10 is less than 50% of the total thickness, it is not preferable because it may be difficult to secure sufficient rigidity. For example, the inner layer 10 may have a thickness of 25 to 450 μm.

Recycled polyethylene resin may be manufactured by recycling waste resources such as waste vinyl, waste PET bottles, and waste plastics generated in various forms, and linear low-density polyethylene (LLDPE), low-density polyethylene (LDPE), and high-density polyethylene (HDPE) are produced. However, in this embodiment, linear low density polyethylene (LLDPE) or high density polyethylene (HDPE) may be used.

The recycled polyethylene resin may be included in an amount of 50 to 70% by weight based on the total weight of the inner layer. If the recycled polyethylene resin is less than 50% by weight, the specific gravity of the polyethylene resin may increase, which may increase costs, and 70% by weight If it exceeds, not only the strength of the zipper bag is lowered, but also the ratio of other components is relatively reduced, making it difficult to secure the desired level of rigidity.

Polyethylene resin is a material added to impart rigidity to recycled polyethylene resin and is obtained by polymerizing refined ethylene gas. It has 4 to 6 times higher impact resistance than ordinary resins, and has excellent electrical insulation and high frequency insulation. . Linear low-density polyethylene (LLDPE) or high-density polyethylene (HDPE) may be used as the polyethylene resin, and preferably the same type as the recycled polyethylene resin is used. For example, when linear low-density polyethylene is applied as the recycled polyethylene resin, linear low-density polyethylene is used, and when high-density polyethylene is applied as the recycled polyethylene resin, high-density polyethylene resin may be used.

Such a polyethylene resin may be included in an amount of 20 to 40% by weight based on the total weight% of the inner layer. If the polyethylene resin is less than 20% by weight, it is difficult to secure tensile strength and tensile elongation at a desired level, and if it exceeds 40% by weight However, the desired level of rigidity can be secured, but the cost may increase.

The antibacterial agent is a material added to impart antibacterial properties, and at least one selected from charcoal, ocher, water-soluble silicon, silver, zinc, and copper, preferably charcoal or water-soluble silicon, may be used. Water-soluble silicon may include SiO ₃ , Na ₂ SiO ₃ , or Na ₂ SiO ₃ 10H ₂ O, preferably Na ₂ SiO ₃ 10H ₂ O, by removing foreign substances present on the surface of silicate minerals. It may be prepared by a step of preparing, melting the silicate mineral by first heat treatment, aging the molten silicate mineral to obtain silicate crystals, and dissolving the silicate crystals in purified water by second heat treatment. .

These antibacterial agents may be included in an amount of 0.1 to 10% by weight, which means that if the amount of the antimicrobial agent is less than 0.1% by weight, the antimicrobial activity may be insignificant, and if it exceeds 10% by weight, defects may occur on the surface of the finished product due to an increase in viscosity. not desirable

In this embodiment, the inner layer 10 may further include one or more additives selected from pigments and fragrances, and these additives may be included in an amount of 0.2 to 5 parts by weight based on 100 parts by weight of the inner layer 10, It may be included in 0.1 to 2.5 parts by weight of pigment and 0.1 to 2.5 parts by weight of perfume, but is not limited thereto.

Pigments are not particularly limited in use, and may be used among organic and inorganic pigments, and any color pigments may be used. Pigments are basically insoluble and can be classified into self-dispersed pigment dispersions in which a dispersing functional group is attached to the surface of the pigments through a special chemical reaction, and polymer dispersions dispersed in a medium using a polymer dispersant. Examples of organic pigments include colorants such as azo, phthalocyanine, dye, condensed polycyclic, quinacridone, nitro and nitroso, black-based carbon black, lamp black, acetylene black, and channel black. Examples of the pigment include metals such as cobalt, iron, chromium, copper, zinc, lead, titanium, vanadium, manganese and nickel, metal oxides and sulfides.

Examples of magenta pigments include C. I. Pigment Red 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 14, 15, 16, 17, 18, 19, 21, 22 , 23, 30, 31, 32, 37, 38, 40, 41, 42, 48 (Ca), 48 (Mn), 57 (Ca), 57: 1, 88, 112, 114, 122, 123, 144, 146, 149, 150, 166, 168, 170, 171, 175, 176, 178, 179, 184, 185, 187, 202, 209, 219, 245, C. I. Pigment Violet 19, 23, 32, 33, 36, 38, 43, 50, etc.

Examples of the yellow pigment include C. I. Pigment Yellow 1, 2, 3, 4, 5, 6, 7, 10, 11, 12, 13, 14, 16, 17, 24, 34, 35, 37, 53, 55 , 65, 73, 74, 75, 81, 83, 93, 94, 95, 97, 98, 99, 108, 109, 110, 114, 117, 120, 124, 128, 129, 133, 138, 139, 147 , 151, 153, 154, 167, 172, 180, etc.

Examples of cyan pigments include C. I. Pigment Blue 1, 2, 3, 15, 15:1, 15:2, 15:3, 15:34, 15:4, 16, 18, 22, 25, 60, 65 , 66, etc.

Other pigments other than magenta, yellow, and cyan include, for example, C. I. Pigment Green 7, 10, C. I. Pigment Brown 3, 5, 25, 26, C. I. Pigment Orange 1, 2, 5, 7, 13, 14, 15, 16, 24, 34, 36, 38, 40, 43, 63, etc.

As a black pigment, as carbon black, for example, MCF88, No. 2300, 2200 B, 900, 33, 40, 45, 52, MA7, 8, 100, etc. (above product names, Mitsubishi Chemical Corporation) Raven 5750, 5250, 5000, 3500, 1255, 700, etc. (above product names, Columbia Carbon Co.) Rega1 400 R, 330 R, 660 R, Mogul L, Monarch 700, 800, 880, 900, 1000, 1100, 1300, 1400, etc. (above product names, Cabot) Color Black FW1, FW2, FW2V, FW18, FW200, S150 , S160, S170, Printex 35, U, V, 140 U, Special Black 6, 5, 4A, 4, etc.

The pigment may be used alone or in combination with other pigments.

These pigments may be included in an amount of 0.1 to 2.5 parts by weight, which means that if the pigment is less than 0.1 parts by weight, it may be difficult to express the desired color, and if it exceeds 2.5 parts by weight, the physical strength of the plastic bag, which is the final product, is caused by excessively included pigments. This is undesirable because the quality of the product may deteriorate.

Fragrance is a substance added to impart fragrance and efficacy, and essential oil may be used, preferably at least one selected from lavender, eucalyptus, rosemary, lemon, bergamot, tea tree, peppermint, and cypress, preferably At least one selected from tea tree and lemon containing a component that prevents the propagation of bacteria may be used.

These fragrances may be included in 0.1 to 2.5 parts by weight, which means that if the fragrance is less than 0.1 parts by weight, the effect of imparting odor or additional functionality may be insignificant, and if it exceeds 2.5 parts by weight, it may cause discomfort due to excessively included fragrances. not desirable

The outer layer 20 is laminated on the upper and lower surfaces of the inner layer 10, respectively, to provide high shrinkage, excellent chemical resistance, excellent heat resistance, and excellent wear resistance, and may be formed of crystalline regenerated polyethylene resin. The crystallinity of the recycled polyethylene resin may be 80% or more, preferably 80 to 98%. This crystalline regenerated polyethylene resin includes 100 parts by weight of at least one resin selected from linear low density polyethylene (LLDPE) and high density polyethylene (HDPE), 0.01 to 5 parts by weight of a crystallization nucleating agent and 0.01 to 5 parts by weight of a crystallization accelerator, a plasticizer, a heat stabilizer, It includes 0.01 to 5 parts by weight of one or more additives selected from emulsifiers, dispersants, and crosslinking agents.

On the other hand, the thickness of the outer layer 20 may be 5 to 50 μm, which means that if the thickness of the outer layer 20 is less than 5 μm, wear resistance is insignificant and it is difficult to satisfy the tensile strength of 12 MPa or more and the tensile elongation of 150% or more. However, if the thickness exceeds 50 μm, the total thickness becomes thick, which is undesirable.

Crystallization nucleating agents are substances added to improve the crystallinity of recycled polyethylene resin to increase heat resistance and durability, such as talc, calcium carbonate, mica, titanium dioxide, carbon black, silica, hydrazide compounds, aromatic sulfonates and phosphonates. At least one selected from among, preferably, talc and carbon black may be mixed and used in a weight ratio of 1: 1 to 5. These crystallization nucleating agents may be included in an amount of 0.01 to 5 parts by weight based on 100 parts by weight of the resin. If the amount of the crystallization nucleating agent is less than 0.01 parts by weight, workability may be deteriorated, and if it exceeds 5 parts by weight, mechanical properties may be deteriorated.

The crystallization accelerator is a material added to improve heat resistance and durability by increasing the crystallization rate and crystallinity of the recycled polyethylene resin during the thermoforming process. Stearic acid, hydroxystearic acid, and ethylene bis stearate Mead (ethylene bis (stearamide)) may include one or more selected from. Such a crystallization promoter may be included in an amount of 0.01 to 5 parts by weight based on 100 parts by weight of the resin. If the amount of the crystallization promoter is less than 0.01 parts by weight, it may be difficult to achieve sufficient crystallinity, and if it exceeds 5 parts by weight, it is not preferable because workability is lowered. .

The additive is a material added to improve physical properties, and may include one or more selected from a plasticizer, a heat stabilizer, an emulsifier, a dispersant, and a crosslinking agent.

Plasticizers are substances that function to inhibit or block the thermal decomposition of resins that occur when mixing or molding at high temperatures, such as trimethylol propane, ethylene glycol, and dibutyl phthalate. And at least one selected from citric acid may be used.

These additives may be included in an amount of 0.01 to 5 parts by weight. If the additive is less than 0.01 parts by weight, the melt viscosity may increase and processability may be deteriorated, resulting in poor physical properties. cannot obtain

5 is an enlarged cross-sectional view of an eco-friendly antibacterial zipper bag according to another embodiment of the present specification.

Referring to Figure 5, the eco-friendly antibacterial zipper bag according to another embodiment of the present specification is formed of a single layer (10 '), 25 to 35% by weight of recycled polyethylene resin, 20 to 40% by weight of polyethylene resin, 25% by weight of crystalline recycled polyethylene resin 35% by weight and 0.1 to 10% by weight of an antimicrobial agent, wherein the crystallized regenerated polyethylene resin comprises 100 parts by weight of one or more resins selected from linear low density polyethylene (LLDPE) and high density polyethylene (HDPE), 0.01 to 5% by weight of a crystallization nucleating agent. It may include 0.01 to 5 parts by weight of parts by weight and a crystallization accelerator. Since the recycled polyethylene resin, polyethylene resin, and antibacterial agent have been specifically described above, they will be omitted.

<Example 1>

65g of recycled polyethylene resin, 34g of polyethylene resin, and 1g of antibacterial agent were prepared as the inner layer composition, and 97g of high density polyethylene (HDPE), 1g of crystallization nucleating agent mixed with talc and carbon black in a weight ratio of 1:1, 1g of stearic acid and additives were prepared as the outer layer composition. 1 g was prepared. Then, a three-layer structured zipper bag was manufactured by co-extrusion using a T-die casting film forming machine.

<Example 2>

A zipper bag was prepared in the same manner as in Example 1, except that 30 g of recycled polyethylene resin, 30 g of polyethylene resin, 39 g of crystalline regenerated polyethylene resin, and 1 g of an antimicrobial agent were used to form a single layer.

<Example 3>

A zipper bag was prepared in the same manner as in Example 1, except that 97 g of high-density polyethylene (HDPE), 1 g of crystallization nucleating agent mixed with talc and carbon black in a weight ratio of 1: 3, 1 g of hydroxystearic acid, and 1 g of additives were used as the outer layer composition. did

<Comparative Example 1>

A zipper bag was manufactured in the same manner as in Example 1, except that a single layer was formed using 50 g of recycled polyethylene resin, 50 g of polyethylene resin, and 1 g of an antimicrobial agent.

Experimental Example 1. Evaluation of physical properties

In order to evaluate the physical properties of the zipper bags according to Examples 1 to 3, crystallinity, mechanical properties, and suitability as food packaging materials were measured, and the results are shown in Table 1 below.

(1) Crystallinity

Using a differential scanning calorimeter (DSC6200R manufactured by Seiko Electronics Co., Ltd.), the laminated film specimen was heated from a state of 30°C to 235°C at a heating rate of 10°C/min, and then measured.

(2) mechanical properties

A laminated film specimen with a width of 15 mm was measured with a tensile tester (Autograph, manufactured by Shimadzu Corporation) under the measurement conditions of a measurement distance (distance between chucks) of 100 mm and a tensile speed of 300 mm/min, and the tensile strength and tensile strength at break saved the believer. In addition, when the tensile strength is 12 MPa or more and the tensile elongation is 150% or more, it was evaluated as passing the mechanical property standard.

(3) Suitability as a food packaging material

In accordance with the Ministry of Food and Drug Safety standards and packaging/container standards and specifications, lead and potassium permanganate consumption and total elution amount eluted from water were analyzed for the laminated film specimens. In addition, when the lead content was 1 mg/L or less, the potassium permanganate consumption was 10 mg/L or less, and the total elution amount was 30 mg/L or less, it was evaluated as having passed the suitability as a food packaging material.

division mechanical properties Suitability as a food packaging material crystallinity
(%) The tensile strength
(MPa) tensile elongation
(%) evaluation lead
(mg/L) potassium permanganate
(mg/L) Total elution amount
(mg/L) evaluation Example 1 95 25 275 fitness 0.1 3 10 fitness Example 2 87 18 240 fitness 0.2 6 12 fitness Example 3 92 22 260 fitness 0.1 4 11 fitness Comparative Example 1 60 10 120 incongruity 3 45 300 incongruity

Referring to Table 1, Examples 1 to 3 were excellent in both mechanical properties and suitability as a food packaging material, whereas Comparative Example 1 had poor mechanical properties and no suitability as a food packaging material. In addition, it was found that the tensile strength and tensile elongation were excellent when the crystallinity was 80% or more.

Although the preferred embodiments of the present invention have been described with reference to the accompanying drawings, the embodiments described in this specification and the configurations shown in the drawings are only the most preferred embodiments of the present invention and represent all the technical ideas of the present invention. Since it is not, it should be understood that there may be various equivalents and modifications that can replace them at the time of this application. Therefore, the embodiments described above should be understood as illustrative and not restrictive in all respects, and the scope of the present invention is indicated by the claims to be described later rather than the detailed description, and the meaning and scope of the claims and their All changes or modified forms derived from equivalent concepts should be construed as being included in the scope of the present invention.

100: Eco-friendly antibacterial zipper bag
10: inner layer
20: outer layer
10': monolayer

Claims (8)

An inner layer composed of 50 to 70% by weight of recycled polyethylene resin, 20 to 40% by weight of polyethylene resin, and 0.1 to 10% by weight of an antibacterial agent; and
An outer layer laminated on the upper and lower surfaces of the inner layer, respectively, and formed of a crystalline recycled polyethylene resin;
The crystalline recycled polyethylene resin includes 100 parts by weight of at least one resin selected from linear low density polyethylene (LLDPE) and high density polyethylene (HDPE), 0.01 to 5 parts by weight of a crystallization nucleating agent, 0.01 to 5 parts by weight of a crystallization accelerator, a plasticizer, and a heat stabilizer 0.01 to 5 parts by weight of one or more additives selected from emulsifiers, dispersants, and crosslinking agents, wherein the crystallization accelerator is at least one selected from stearic acid, hydroxystearic acid, and ethylene bis-steamide,
The antibacterial agent is water-soluble silicon, and the water-soluble silicon is prepared by removing foreign substances present on the surface of the silicate mineral, melting the silicate mineral by primary heat treatment, aging the molten silicate mineral to obtain a silicate crystal An eco-friendly antibacterial zipper bag, characterized in that produced by the steps of dissolving silicate crystals in purified water and subjecting them to secondary heat treatment.
25 to 35% by weight of regenerated polyethylene resin, 20 to 40% by weight of polyethylene resin, 25 to 35% by weight of crystalline regenerated polyethylene resin, and 0.1 to 10% by weight of an antibacterial agent,
The crystalline regenerated polyethylene resin includes 100 parts by weight of at least one resin selected from linear low density polyethylene (LLDPE) and high density polyethylene (HDPE), 0.01 to 5 parts by weight of a crystallization nucleating agent, and 0.01 to 5 parts by weight of a crystallization accelerator, and the crystallization The accelerator is at least one selected from stearic acid, hydroxystearic acid, and ethylene bisstamide;
The antibacterial agent is water-soluble silicon, and the water-soluble silicon is prepared by removing foreign substances present on the surface of the silicate mineral, melting the silicate mineral by primary heat treatment, aging the molten silicate mineral to obtain a silicate crystal An eco-friendly antibacterial zipper bag, characterized in that produced by the steps of dissolving silicate crystals in purified water and subjecting them to secondary heat treatment.
delete According to claim 1,
Eco-friendly antibacterial zipper bag, characterized in that the thickness of the inner layer does not exceed 90% of the total thickness.
delete delete According to claim 1 or 2,
The eco-friendly antibacterial zipper bag has a tensile strength of 12 MPa or more and a tensile elongation of 150% or more.
According to claim 1 or 2,
Eco-friendly antibacterial zipper bag, characterized in that the lead elution amount measured after immersing the eco-friendly antibacterial zipper bag in water is 1 mg / L or less, and the potassium permanganate elution amount is 10 mg / L or less.

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