KR102264798B1 - compound for biodegradable plastic and manufacturing method of eco-friendly biodegradable plastic bag - Google Patents

Abstract

The present invention relates to a compound for biodegradable plastic and a manufacturing method of an eco-friendly biodegradable bag using the same, and more particularly, to a compound for biodegradable plastic, which can improve biodegradability while increasing strength and durability by using discarded natural materials, and a manufacturing method of an eco-friendly biodegradable bag using the same. The compound for the biodegradable plastic of the present invention contains 0.1 to 20 parts by weight of onion peel powder based on 100 parts by weight of a biodegradable resin.

Description

Compound for biodegradable plastic and manufacturing method of eco-friendly biodegradable plastic bag using same

The present invention relates to a compound for biodegradable plastic and a method for manufacturing an eco-friendly biodegradable bag using the same, and more particularly, to a biodegradable plastic that can improve biodegradability and increase strength and durability by using discarded natural materials. It relates to a compound for use and a method for manufacturing an eco-friendly biodegradable bag using the same.

Plastics are used in a variety of applications, from industrial materials to disposables and packaging materials because of their light, strong, easy to process, and non-decomposable properties.

However, in recent years, as interest in environmental problems has increased, the problem of disposal of non-degradable waste plastics has emerged as a challenge. Various solid wastes including plastics have been mainly treated by landfill, incineration, and recycling methods, but these methods cannot completely solve the environmental pollution problem.

Therefore, as one of the solutions to these problems, much attention is focused on the development of biodegradable plastics that maintain their function and structure during use but are decomposed into water and carbon dioxide by microorganisms once discarded.

Biodegradable plastics are biodegradable, but have disadvantages in that they have weak heat resistance and impact resistance, and weak mechanical properties such as tear strength. Accordingly, a technique for supplementing physical properties by compounding additives in various biodegradable resins has been proposed.

Korean Patent Laid-Open No. 10-2015-0040673 discloses a biodegradable resin compound.

The biodegradable resin compound improves impact strength by adding inorganic additives such as talc, calcium carbonate, silica, glass fiber, and mica to the biodegradable resin, but the inorganic additive has a disadvantage in that it is an inorganic material that is not biodegradable.

Republic of Korea Patent Registration No. 10-2092572 discloses a method for manufacturing an eco-friendly bio-plastic containing jellyfish collagen.

Jellyfish collagen has the advantage of being biodegradable, but it has disadvantages in that it is not easy to purchase raw materials and the purchase cost is high.

1. Republic of Korea Patent Publication No. 10-2015-0040673: Biodegradable resin compound and biodegradable packaging material 2. Republic of Korea Patent No. 10-2092572: Manufacturing method of eco-friendly bio-plastic using jellyfish and eco-friendly bio-plastic

The present invention was created to improve the above problems, and by utilizing discarded natural materials, a compound for biodegradable plastics that can easily supply and supply raw materials, improve biodegradability at low cost, and at the same time increase strength and durability, and An object of the present invention is to provide a method for manufacturing an eco-friendly biodegradable bag using the same.

The compound for biodegradable plastics of the present invention for achieving the above object contains 0.1 to 20 parts by weight of onion peel powder based on 100 parts by weight of the biodegradable resin.

The biodegradable resin is at least one of polylactic acid (PLA), polybutylene adipate terephthalate (PBAT), polycaprolactone (PCL), and polybutylene succinate (PBS).

It further contains 0.1 to 10 parts by weight of banana peel powder based on 100 parts by weight of the biodegradable resin.

And in the method of manufacturing an eco-friendly biodegradable bag of the present invention for achieving the above object, a compound for biodegradable plastic is obtained by melting and kneading a mixture of 0.1 to 20 parts by weight of onion peel powder with respect to 100 parts by weight of a biodegradable resin. step of; It includes; extruding the compound for the biodegradable plastic.

As described above, the present invention can greatly increase the strength and durability of plastic products such as bags while improving biodegradability by using natural materials such as onion peels or banana peels.

In addition, the present invention can reduce the production cost while preventing environmental pollution caused by disposal by recycling the peel, which is a non-edible part of discarded vegetables or fruits as a resource.

Hereinafter, a biodegradable plastic compound according to a preferred embodiment of the present invention and a method for manufacturing an eco-friendly biodegradable bag using the same will be described in detail.

The compound for biodegradable plastic according to an embodiment of the present invention contains a biodegradable resin and onion skin powder. For example, it may contain 0.1 to 20 parts by weight of onion peel powder based on 100 parts by weight of the biodegradable resin.

As biodegradable resins, polyethylene succinate (PES: poly ethylene succinate), polybutylene succinate (PBS: poly butylene succinate), polybutylene adipate terephthalate (PBAT: poly butylene-co-adipate-co-terephthalate), Polyethylene adipate terephthalate (PEAT: polyethylene-co-adipate-co-terephthalate), polybutylene succinate terephthalate (PBST: poly butylene-co-succinate-co-terephthalate), polyethylene succinate terephthalate (PEST: poly ethylene-co-succinate-co-terephthalate), polybutylene succinate adipate terephthalate (PBSAT: poly butylene-co-succinate-co-adipate-co-terephthalate), polyethylene succinate adipate terephthalate (PESAT: poly Any one or a mixture of two or more of ethylene-co-succinate-co-adiapte-co-terephthalate), polylactic acid (PLA), and polycaprolactone (PCL) may be used.

Preferably, any one or two or more of polylactic acid (PLA), polybutylene adipate terephthalate (PBAT), polycaprolactone (PCL), and polybutylene succinate (PBS) may be mixed as the biodegradable resin. .

More preferably, a mixture of polylactic acid (PLA) and polybutylene adipate terephthalate (PBAT) is used as a biodegradable resin. For example, polylactic acid (PLA) and polybutylene adipate terephthalate (PBAT) may be mixed and used in a weight ratio of 1 to 5:1.

Polylactic acid (PLA) is a type of biodegradable polymer resin, and has good heat resistance and excellent strength among biodegradable polymer resins. Polylactic acid may have a density of 1.2 to 1.3 g/cm ³ , and a melt index of 1 to 8 g/10 min (2.16 kg, 190° C.).

As a commercialized product of polylactic acid, Nature Works' crystalline PLA with excellent heat resistance, 2003D and 4032D, or Total-Corbion's LX175, etc. can be used.

Polylactic acid has the disadvantage of low tear strength. Polybutylene adipate terephthalate serves to compensate for the low tear strength of polylactic acid.

Polybutylene adipate terephthalate (PBAT: polybutylene adipate-co-terephthalate) is a kind of biodegradable polymer resin, and improves elongation and strength as well. Polybutylene adipate terephthalate may have a density of 1.2 to 1.3 g/cm ³ , and a melt index of 1 to 8 g/10 min (2.16 kg, 190° C.).

As a commercialized product of polybutylene adipate terephthalate, BASF's Ecoflex C1200 or Geosoltech's Solpol1000 or EnPol's PBG7070 or Kingfa's A400 can be used.

Onion peel powder is a finely crushed peel, which is the inedible part of an onion. The onion skin powder may be pulverized to a particle size of 100 to 400 mesh. Onion skins are wastes of natural materials generated during the onion processing process. Unlike the edible part, the stalk, which is the edible part of the onion, most of it is discarded. Onion skins differ from stalks in that they consist of lignified fibers.

Onion skins contain a large amount of polyphenols, especially quercetin. Onion skin contains about 10 to 100 times higher polyphenols including quercetin than the edible part of the onion, the scales. Quercetin is known as a substance with very high antioxidant activity that removes free radicals. Therefore, when the onion skin is added, biodegradability can be increased, and at the same time, it is possible to prevent thermal deformation and discoloration by inhibiting the oxidation of plastic, thereby improving durability.

Onion peel powder contains 0.1 to 20 parts by weight based on 100 parts by weight of the biodegradable resin. If the content of the onion skin powder is less than 0.1 parts by weight, the effect is insignificant, and if it exceeds 20 parts by weight, the strength may be lowered.

The compound for biodegradable plastics of the present invention can be obtained in the form of pellets by extruding after melting and kneading a mixture of a biodegradable resin and onion peel powder.

On the other hand, the present invention may further contain a banana peel powder as another example. For example, it contains 0.1 to 20 parts by weight of onion peel powder and 0.1 to 10 parts by weight of banana peel powder with respect to 100 parts by weight of the biodegradable resin.

Bananas are an important fruit crop with an annual output of 500,000 tons, and are mainly produced in India, China, the Philippines, and Brazil. Banana peels, the main by-product of bananas, account for 30% of bananas. Banana peels generated while eating and processing bananas are mostly discarded or reduced to food waste, becoming a major cause of environmental pollution.

Banana peel consists of fiber, protein, essential amino acids, unsaturated fatty acids, potassium, etc., and contains cellulose, hemicellulose, pectin, chlorophyll pigment, and low molecular weight components. In addition, it contains a large amount of phenolic compounds such as tannin, anthocyanin, delphinidin, cyanidin, catecholamine, carotenoid, lutein, triterpene, etc. is known to have been In addition, the rich fiber of banana peel has a high water absorption capacity, so it serves as a precursor to adsorb metal substances, colorants, pesticides and contaminants such as food.

Banana peel powder is ground after drying the peel, which is the non-edible part of the banana fruit except for the pulp. Banana peels can be dried by hot air drying, freeze drying, or natural drying methods. Banana peel powder may be pulverized to a particle size of 100 to 400 mesh.

The present invention can improve tensile strength and elongation by adding banana peel powder.

The present invention may further contain limecake powder as another example. For example, it may contain 0.1 to 20 parts by weight of onion peel powder, 0.1 to 10 parts by weight of banana peel powder, and 1 to 5 parts by weight of lime cake powder with respect to 100 parts by weight of the biodegradable resin.

Lime cake is produced in the sugar-sweetening process. When quicklime is added to crude sugar juice during the sugar processing process and carbon dioxide is blown in, wastewater is generated when calcium carbonate is filtered, and when this wastewater is dehydrated, limecake with 30-40% moisture is generated. Limecake contains suspended substances such as coal, activated carbon, and diatomaceous earth and organic substances such as sugar juice. Currently, limecake is partially used as a fertilizer or soil conditioner, but it is known that most of it is disposed of in landfills as industrial waste. Accordingly, the present invention can improve processability, moldability, and physical properties of biodegradable plastics by using the discarded limecake.

Limecake is dried to a moisture content of 8 wt% or less and then pulverized to be used in powder form.

On the other hand, in the present invention, of course, known additives such as a plasticizer may be further added.

The compound for biodegradable plastics of the present invention can be used in the manufacture of various plastic products by extrusion or injection molding. For example, it can be used to manufacture products such as bags, films, sheets, containers, and packs.

The compound for biodegradable plastics of the present invention described above utilizes discarded natural materials, so the supply and demand of raw materials is easy and the cost is low. In addition, it has the advantage of improving the biodegradability and at the same time increasing the strength and durability.

As an example of a product using the compound for biodegradable plastics of the present invention described above, it is an eco-friendly biodegradable bag. Envelopes can be manufactured by extruding a compound for biodegradable plastics in a conventional manner.

Hereinafter, the present invention will be described with reference to the following examples. However, the following examples are provided to illustrate the present invention in detail, and the scope of the present invention is not limited to the following examples.

(Example 1)

A mixture of 12 parts by weight of onion peel powder with respect to 100 parts by weight of the biodegradable resin was put into a kneader, melted and kneaded, and then supplied to an extruder to prepare a compound in the form of pellets.

As a biodegradable resin, polylactic acid (2003D, Nature Works) and polybutylene adipate terephthalate (Ecoflex C1200, BASF) were mixed in a weight ratio of 3:1 and used. And the onion skin powder was prepared by pulverizing the non-edible part of the yellow-brown onion skin to a particle size of 250 mesh.

(Example 2)

A compound was prepared in the same manner as in Example 1, but a mixture of 12 parts by weight of onion peel powder and 8 parts by weight of banana peel powder was used with respect to 100 parts by weight of the biodegradable resin.

Banana peel powder was prepared by rapidly freezing the banana peel at -45°C for 15 hours, then drying it at -40°C for 48 hours in a freeze dryer with a vacuum degree of 0.5 torr, followed by pulverization.

(Comparative example)

A mixture of polylactic acid (2003D, Nature Works) and polybutylene adipate terephthalate (Ecoflex C1200, BASF) as a biodegradable resin in a weight ratio of 3:1 is put into a kneader, melted and kneaded, and then melted and kneaded by an extruder was supplied to prepare a compound in the form of pellets.

<Tear strength test>

Using an extruder, the compounds of Examples 1 and 2 and Comparative Examples were extruded to prepare a film specimen having a thickness of 20 μm.

The tear strength was measured for the prepared film specimen. The tear strength was measured using a tear strength machine (DM-805-1, Daeil Gonggo) at 23 ° C and 50% relative humidity, with a standard line spacing of 25 mm and a tensile rate of 500 mm/min. 1 is shown. The film specimen of Example 1 is called the first test specimen, the film specimen of Example 2 is called the second test specimen, and the film specimen of the comparative example is called the comparative specimen.

division Tear strength (g _f ) test specimen 1 517 test specimen 2 662 comparative specimen 395

Referring to the results in Table 1, it was confirmed that the tear strength of the test specimen was significantly improved compared to the comparative specimen. In the case of Test Specimen 1, it was found that the tear strength was improved by about 31% compared to the comparative specimen that did not contain onion peel powder.

Through these experimental results, it was found that the tear strength could be greatly improved by the addition of onion peel powder.

<Tensile strength and elongation test>

Tensile strength and elongation were measured for the specimens used in the above experiment. Tensile strength and elongation were measured using UTM equipment (Testone Co., Ltd.) according to ASTM D882 standard. The experimental results of tensile strength and elongation are shown in Table 2 below.

division Tensile strength (g _f /mm ² ) Elongation (%) test specimen 1 187 255 test specimen 2 275 340 comparative specimen 146 212

Referring to the results in Table 2, the tensile strength and elongation of test specimens 1 and 2 were significantly increased compared to the comparative specimens. Test Specimen 1 showed an increase in tensile strength and elongation by 28% and 20%, respectively, compared to the comparative specimen. And it was found that test specimen 2 increased tensile strength and elongation by 88% and 60%, respectively, compared to the comparative specimen.

Through the above experimental results, it was found that tensile strength and elongation were significantly improved when onion peel powder and banana peel powder were added together than when onion peel powder alone was added.

On the other hand, in the case of a film specimen obtained by molding with an extruder a compound using a mixture of 12 parts by weight of onion peel powder, 8 parts by weight of banana peel powder, and 4 parts by weight of lime cake powder with respect to 100 parts by weight of biodegradable resin, test specimen 2 It was found that the tensile strength was improved by about 15% compared to .

Through the above-described experiments, it was confirmed that the present invention can improve not only the tearing strength but also the tensile strength and the elongation of the plastic product due to the addition of onion peel powder and banana peel powder while being biodegradable.

As mentioned above, although the present invention has been described with reference to one embodiment, it will be understood that this is only exemplary, and that those skilled in the art may make various modifications and equivalent embodiments therefrom. Therefore, the true protection scope of the present invention should be determined only by the appended claims.

Claims (4)

Contains 0.1 to 20 parts by weight of onion peel powder for improving tear strength and 0.1 to 10 parts by weight of banana peel powder for improving tensile strength and elongation with respect to 100 parts by weight of biodegradable resin,
The onion peel powder is obtained by pulverizing the skin, which is a yellowish-brown non-edible part composed of woody fibers,
The banana peel powder is a biodegradable plastic compound, characterized in that it is obtained by drying and pulverizing the peel, which is a non-edible part except for the pulp part of the banana fruit. According to claim 1, wherein the biodegradable resin is polylactic acid (PLA), polybutylene adipate terephthalate (PBAT), polycaprolactone (PCL), characterized in that at least one of polybutylene succinate (PBS) compound for biodegradable plastics. delete A biodegradable plastic by melting and kneading a mixture of 0.1 to 20 parts by weight of onion peel powder for improving tear strength and 0.1 to 10 parts by weight of banana peel powder for improving tensile strength and elongation with respect to 100 parts by weight of biodegradable resin obtaining a compound for use;
Including; extruding the compound for the biodegradable plastic;
The onion peel powder is obtained by pulverizing the skin, which is a yellowish-brown non-edible part composed of woody fibers,
The banana peel powder is a method of manufacturing an eco-friendly biodegradable bag, characterized in that it is obtained by drying and pulverizing the peel, which is a non-edible part except for the pulp part of the banana fruit.