KR20190001046A - Composition of biodegradable catalyst for bio polyethlene wrap and oxo-biodegradable bio wrap using thereof - Google Patents

Abstract

The present invention relates to a biodegradation catalyst and an oxidative biodegradable bio-polyethylene wax. More particularly, the present invention relates to a biodegradable catalyst prepared by using biomass, acetyl carbamate metal salt, unsaturated fatty acid, sodium bicarbonate, stearic acid, The present invention relates to a technology for producing an oxidative biodegradable bio-polyethylene wax which is superior, and which is oxidatively biodegraded under natural conditions and is excellent in price competitiveness.

Description

TECHNICAL FIELD The present invention relates to a biodegradable catalyst composition for bio-polyethylene wraps, and to biodegradable bio-polyethylene wraps using the same. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a biodegradable catalyst composition for bio-

The present invention relates to a biodegradable catalyst composition for bio-polyethylene wraps and an oxidative biodegradable bio-polyethylene wax using the same. More particularly, the present invention relates to a biodegradable bio-degradable polypropylene biodegradable wax using a biodegradable catalyst composition comprising a predetermined amount of acetyl carbamate metal salt, unsaturated fatty acid, sodium bicarbonate, stearic acid, Biodegradability of a bio-polyethylene woven product formed by using the biodegradable polyethylene wax, and to provide biodegradable polyethylene wax having excellent environmental friendliness, mechanical properties and cost competitiveness.

As we begin to recognize the importance of the environment, technology development that does not pollute the environment is essential. Plastic, which has become a necessity for our life, has become a main cause of environmental pollution because it has not decayed. However, recently, the development of plastics technology that is decomposed in nature has been actively activated, and the demand is also explosively increasing.

Bio plastics are broadly divided into biodegradable plastics, oxo-biodegradable plastics and bio based plastics, which include biodegradable additives in addition to biodegradable plastics. Oxidized biodegradable plastic has the effect of suppressing carbon emissions with plastics containing oxidative biodegradation additives in addition to plastics containing more than 25% of carbon neutral biomass derived from plants such as corn, It can reduce the consumption of petroleum. After disposal, it is decomposed by microorganisms. Especially, it is getting eco-friendly material in terms of improvement of physical properties and price competitiveness.

Oxidized biodegradable plastics among bioproducts, which are attracting attention as eco-friendly materials, are undergoing rapid industrialization because they can overcome the problems of early biodegradation, degradation of physical properties, price competitiveness, and recycling which have been pointed out as disadvantages of conventional biodegradable plastics. From January 1, 2014, the United Arab Emirates (UAE) announced that it will start enacting relevant legislation to protect the environment and declare regulations on disposable items and garbage bags from January 2012. Oxo-biodegradation (Oxo- biodegradable) packaging materials and products only in the UAE, importing and distributing them in the UAE, prohibiting the use of recycled plastics, and certifying that the biodegradable plastics have been certified by Canada, UK, Korea, Singapore, Belgium, Saudi Arabia, This trend is spreading.

Bioplastics accounted for one to five percent of the world plastic market in the early part of the century, but grew to become an industry that occupies more than 10 percent after 2018, driven by market demands for green and global pace of research and development. Respectively. However, biodegradable plastics among bioplastics still have limited use. Due to cost increases, it is 2 to 3 times more expensive than conventional plastic products, and it has lower physical properties than existing synthetic plastics, so there is a problem to be solved for use in electronic products and industrial products.

In recent years, a product has been developed using a carbon-reduced plant biomass, a general-purpose plastic, a biodegradable resin, a biodegradation accelerator, an oxidizing agent, a compatibilizer, etc. in plastic, but a thin film for thin film packaging It is disadvantageous in that the physical properties of the produced film are deteriorated.

Guillet, J. E., "Polymers and Ecological Problems," Baum, B. and White, R.A. (eds.), Plenum Press, New York, 1973, pp. 45-60.

DISCLOSURE OF THE INVENTION The present invention has been made to solve the problems of the prior arts such as the biodegradable plastics, and it is an object of the present invention to provide an environmentally friendly biodegradation catalyst composition capable of easily biodegrading or spontaneously decomposing but also securing mechanical properties such as elongation and tensile strength, And a method for producing the same.

In order to solve the above technical problem, in the present invention, a biocompatible resin composition comprising at least 25 parts by weight of biomass, at least 0.1 part by weight of an acetyl carbamate metal salt, at least 50 parts by weight of a binder resin, at least 5 parts by weight of an unsaturated fatty acid, 5 parts by weight or less and 5 parts by weight or less of stearic acid.

Another aspect of the present invention provides a method for producing the biodegradable catalyst.

According to another aspect of the present invention, there is provided an oxidative biodegradable bio-lab produced using the biodegradation catalyst, the linear low density polyethylene, the low density polyethylene, the polyethylene modifier, the antifog agent, the adhesive, the biomass, and the biomass plasticizer.

The biodegradation catalyst composition according to the present invention and the biodegradable biodegradable polypropylene biodegradable biodegradable polymer are biodegradable in a natural environment during disposal to reduce the environmental load and can be used in other product groups such as biofilms for 3D printers.

The biodegradable biodegradable polyethylene bioloag according to the present invention can be used in a variety of flexible products such as packaging films, industrial wrap films known as stretch films, and the like because of excellent mechanical properties such as tensile strength and elongation. Carbon neutral type plant biomass, calcium carbonate, etc. can be applied, which can be expected to reduce carbon dioxide on the earth and reduce limited oil resources.

1 is a schematic view of a process for producing a biodegradation catalyst according to the present invention.
Figure 2 is a chart showing standard guidance for exposure and testing by oxidative degradation and biodegradation according to ASTM D 6954;
Fig. 3 shows test results for carbonyl group formation by the FTIR test.
Fig. 4 shows the results of a polyethylene polymer decomposition test by fungal growth.
5 shows the results of the organic carbon content test of the biodegradation catalyst.

The biodegradation catalyst composition according to the present invention comprises

25 to 50 parts by weight of biomass;

0.1 to 2 parts by weight of acetyl carbamate metal salt;

30 to 50 parts by weight of a binder resin;

1 to 5 parts by weight of an unsaturated fatty acid;

10 to 50 parts by weight of calcium carbonate;

1 to 5 parts by weight of sodium bicarbonate; And

1 to 5 parts by weight of stearic acid.

The biomass may be a carbon-neutral plant biomass. The biomass may be a biomass or a mixture including organic carbon such as starch having excellent processability and physical properties, and biomass by-products. Although the use of biomass is more effective in reducing carbon dioxide, it is important to use an appropriate amount because of the problem of deteriorating physical properties when too much amount is used. However, considering that the bioabase plastic standard is 25 parts by weight or more based on the organic carbon content Preferably at least 25 parts by weight is added. Further, when the amount is more than 50 parts by weight, there is a problem that the physical properties are lowered.

The acetyl carbamate metal salt may be ferric acetyl carbamate, aluminum acetyl carbamate, manganese acetyl carbamate, or a mixture thereof as a catalyst added to shorten the complete decomposition period of the polymer plastics to one year to five years, 0.1 part by weight or more is preferably used. If it is used in an amount of less than 0.1 part by weight, the final biodegradation period becomes longer. If the amount is more than 2 parts by weight, the effect is excellent but the price is increased.

The acetyl carbamate metal salt, ferric acetyl carbamate, aluminum acetyl carbamate, iron of manganese acetyl carbamate, aluminum, and manganese serve to promote the photooxidation reaction.

The binder resin may be linear low density polyethylene, low density polyethylene, or polypropylene. Preferably, low density polyethylene may be used.

The unsaturated fatty acid may be a polyene fatty acid having two or more double bonds such as oleic acid, linoleic acid, arachidonic acid, and linolenic acid, preferably a mixture of alpha linoleic acid and arachidonic acid. Unsaturated fatty acids can contribute to the decomposition of polymers by performing an auto-oxidizing function of the polymer, and 1 to 5 parts by weight can be used. When the amount is less than 1 part by weight, the automatic oxidative decomposition function is weak when the polymer is decomposed. When the amount is more than 5 parts by weight, there is a possibility that the physical properties of the polymer deteriorate and the price increases.

The calcium carbonate may serve as an inorganic filler.

The sodium bicarbonate can act as a plasticizer and a metal salt of the plant biomass to accelerate the decomposition and can be used in an amount of 1 to 5 parts by weight, and when it is used in an amount of less than 1 part by weight, its function may be weak. There is a problem that foaming can occur.

The stearic acid is a saturated fatty acid having no double bond and can perform a lubricating function such as a wax that smoothes productivity and flowability. The stearic acid may be used in an amount of 1 to 5 parts by weight. When it is used in an amount of less than 1 part by weight, the function as an activator is hardly expected, and when used in an amount exceeding 5 parts by weight, scum may occur in the die discharge part.

A composition which is a mixture of the above ingredients as a whole can be used as an oxidative biodegradation catalyst in the present invention to control the final biodegradation period of the film product including the composition according to the present invention and the polyethylene wraps. On the other hand, the amount of the raw material of the composition is, for example, 30 parts by weight of biomass, 0.1 parts by weight of ferric acetyl carbamate, 0.3 parts by weight of aluminum acetyl carbamate, 40 parts by weight of binder resin, 5 parts by weight of unsaturated fatty acid, 20 parts by weight of calcium carbonate, 2 parts by weight of stearic acid and 2.6 parts by weight of stearic acid.

The photooxidation mechanism for oxidizing and decomposing the polymer will be described as follows.

The polymer chains consist of carbon-carbon and carbon-hydrogen bond rings, and their binding energy is approximately 82-84.. Thus, when the same amount or more energy (including heat, light, and mechanical energy) is applied to the polymer, the polymer may be subjected to a Norrish I reaction in which the chain is destroyed and radicalized, or the Norrish monomer is monomers, II reaction.

Light can be converted into energy quantified by the following equation, and the energy value becomes larger as the wavelength becomes shorter.

E = h? = H (c /?)

E = energy

h = Plank constant

c = speed of light

λ = wavelength

υ = frequency

It can be seen from the above equation that the wavelength band of light for destroying the polymer chains is 290 to 320 nm, and the sunlight reaching the surface of the earth contains ultraviolet rays in this range. Polymer degraded by ultraviolet rays is decomposed rapidly by free radical reaction when it is combined with oxygen when the catalyst is present.

The free radical oxidation reaction is as follows.

As described above, the synthetic resin polymer is decomposed into a low molecular carboxylic acid by an oxidation reaction by ultraviolet rays, and the low molecular weight carboxylic acid compound is decomposed again by microorganisms and returned to nature.

However, as described above, in the case of embedding a synthetic resin polymer, since the buried region can not be exposed to ultraviolet rays and initial decomposition is difficult, a low molecular weight carboxylic acid compound as described above can not be produced, It has a drawback that it is difficult.

Accordingly, by applying biomass, acetyl carbamate metal salt, unsaturated fatty acid, bicarbonate, etc., it is possible to reduce the molecular weight of the polymer which is difficult to decompose by photo-oxidation in the first step in the absence of light under the action of heat, moisture and oxygen , Followed by oxidative decomposition through an automatic oxidation reaction, and biodegradable biodegradable biodegradable biodegradable biodegradable biodegradable biodegradable biodegradable biodegradable.

Oxidation Biodegradation Catalysts Explaining the mechanism of promoting oxidative biodegradation of the metal salt of acetyl carbamate, the metal ion contained in the acetyl carbamate metal salt generates energy by repeating the peroxide and oxidation-reduction reaction, and the radical reaction is initiated by this energy . In addition, this reaction causes the carbon chain of the polymer to be cleaved and oxidative decomposition to occur, so that the molecular weight of the polymer is reduced. The sodium ion of sodium bicarbonate reacts with the polymer and carbonyl group together with the trivalent iron ion to accelerate decomposition. The resulting low-molecular-weight cargo is finally digested and absorbed by the microorganisms in the natural environment and converted into water and carbon dioxide, and the decomposition is completed. According to Scott, G., Ed., 1993, Atmospheic Oxidation and Antioxidants, Elsevier, London. The carbonyl group (RC = OR), an atomic group in which a carbon atom and an oxygen atom double bond, It is known as a substance to be produced.

A common oxidative biodegradation mechanism is

In the first step, biodegradation and oxidative decomposition of the biodegradable component proceeds, and the biodegradable component contained in the composition is decomposed to cause physical collapse. As a result, the surface area of the biodegradable component increases, accelerating the decomposition reaction, decreasing the strength and elongation, Weakening proceeds.

In the second step, the molecular weight is reduced due to chemical decomposition, and the biodegradation is transferred. It is autoxidized by carboxylic acids, ketones, aldehydes and the like generated by biodegradation, and the surface gradually becomes hydrophilic, accelerating the progress of three-step biodegradation. In addition, thermal decomposition and chemical decomposition are accelerated by the action of releasing the added oxidizing agent.

In step 3, microbial degradation occurs and the final biodegradation proceeds.

At this time, the polymer such as polyolefin is converted into alcohol, aldehyde, and fatty acid by low-molecular-weight conversion, and further degradation proceeds to water, carbon dioxide, and biomass.

These biodegradation can be carried out simultaneously and concurrently with each other in the natural environment. G. Scott et al., Polymer Degradation and Stability Vol. 46, p.211 ~ 224 (1994), when the molecular weight is lowered to 40,000 or less, microorganisms are actively degraded in the ecological cycle as a food source for various microorganisms existing in the natural environment without the action of additives .

According to ASTM D 6954, the oxidation biodegradation experiment is carried out step by step as shown in FIG.

The first step is to measure the amount of volatile substances and change the molecular weight in order to confirm that the low molecular weight of the polymer progresses and collapses into organic compounds by UV and heat,

In the second step, the degree of biodegradation of the collapsed polymer is measured by the amount of carbon dioxide generated within a certain period of time.

In the third stage, the toxicity test can be carried out for residues which are not biodegradable in the second stage. However, most of the biodegradation degree is tested in two stages by country and test institute. For the ecotoxicity test, plant cultivation and soil toxicity evaluation Toxicity tests are conducted only when necessary.

Through the above process, a biodegradable catalyst composition for bio-polyethylene wraps can be obtained, which is melt-extruded by an extruder to form a film. The biodegradable bio-polyethylene wraps can be produced by using the biodegradable wax alone as a film. If the biodegradable catalyst composition alone is used to prepare a bio-polyethylene wrap to make a single layer, EVA resin or SEBS resin can be added to reinforce the elongation and tensile strength. In the case of EVA resin, the content of vinyl acetate is 12 to 21 parts by weight It is preferable to use 1 to 5 parts by weight relative to the whole film. If the content is too small, the change in physical properties can not be confirmed. In many cases, the die discharge portion is viscous during the extrusion operation and the inside of the cylinder is pressurized to cause self heat generation, and the biomass is carbonized, . For the same reason, SEBS is also very sticky, so in case of SEBS, it is suitable to use 2 to 10 parts by weight relative to the whole film.

Further, co-extrusion with another plastic resin can be used to produce a multi-layered bio-polyethylene wrap. Of course, a film imparted with various functions can be obtained by selection of a resin to be used. It goes without saying that a film having excellent gas barrier properties or a film having excellent heat adhesion can be used to add functionality.

The biodegradable catalyst composition may be co-extruded with the first resin layer and other resin composition for film as an additive to form a multilayer film. It is needless to say that the multilayered film can be formed in various forms such that the first resin layer is located outside, inside, or in the middle. The above-mentioned composition is preferably an olefin-based resin because the resin used as a base of the composition for wrapping is olefin-based. The olefin-based resin is preferably a polyethylene resin. This is because polyethylene has a broader range of softening point than polypropylene softening point and has structural advantages. The polyethylene resin may be further specified to provide better processability and physical properties for use in wrapping and packaging applications. It is of course possible to use a mixture of polypropylene having a more crystalline structure depending on the required properties. It is preferable that the second resin layer is a multi-layered structure by co-extruding a linear low density polyethylene resin and a low density polyethylene resin.

Generally, in the case of polyethylene wraps, linear low density polyethylene, low density polyethylene, polyethylene modifier, anti-fogging agent, adhesive and the like are generally used.

The oxidative biodegradable bio-lab according to the present invention can be obtained as a thin film-like film through a series of extrusion and cooling processes. The mechanical properties predetermined in the composition step must also be realized in the film, and thus the thickness of the film needs to be set. The thickness of the oxidative biodegradable transparent bio-lab according to the present invention may preferably be 10 to 20 占 퐉, and more preferably 11 to 15 占 퐉. Excellent physical properties suitable for the film can be exhibited in the thickness range of 11 to 15 mu m.

Hereinafter, the present invention will be described in more detail with reference to Examples and Experimental Examples. It should be understood, however, that these examples are for illustrative purposes only and are not intended to limit the scope of the invention in any way.

Example

(1) Preparation of a biodegradation catalyst

30 parts by weight of PLA starch, 0.1 part by weight of ferric acetyl carbamate, 0.3 part by weight of aluminum acetyl carbamate, 40 parts by weight of LDPE, 5 parts by weight of linoleic acid, 20 parts by weight of calcium carbonate, 2 parts by weight of sodium bicarbonate and 2.6 parts by weight of stearic acid, And then mixed and dried at a rotational speed of 400 RPM until the temperature became 80 ± 5 ° C. by the heat generated at the time of high-temperature mixing. Then, the extruder was extruded in an extrusion molding machine having a die diameter of 90 mm and L / D 40 , The strands were extruded at a screw temperature of 180 to 200 DEG C and a screw rotation speed of 500 RPM, cooled by air cooling or water cooling, and then cut into pelletizers to prepare pellet-shaped biodegradation catalysts.

(2) Production of oxidative biodegradable bio-lab

Using the inflation film molding machine (1400-OOBBIN, Eugene Engineering), the contents of the biodegradable catalysts of the examples were varied and mixed with the LLDPE, LDPE, PE modifier, adhesive, antifog agent and mixed in the mixer. And processed into a film having an average thickness of 0.02 mm. The mixing ratios are shown in Table 1. The biodegradable catalyst and PP of the examples were mixed in a mixer using a T-Die Chill Roll Machine (LABTECH Engineering), transferred to a hopper, processed at 0.03 mm at 210 ° C Respectively. The mixing ratios of the biodegradation catalysts were adjusted to 0, 1 and 2 parts by weight on the basis of weight, PP-1 and PP-2, respectively.

[Table 1]

Experimental Example

(One) Biomass  origin Of organic carbon  content

The test was carried out on 25 g of the oxidative biodegradable film sample obtained from the Example according to ASTM D 6866 (European CEN 16137) which is a standard for measuring the organic carbon content from biomass in the biodegradation catalyst.

As shown in FIG. 5, the organic carbon content of bio-labs was 39%, which was higher than the United States Department of Agriculture certification of 25%.

(2) Mine  Test result

The photodegradation was performed by treating the polyethylene and polypropylene wraps according to ASTM D 5208-01 CYCLE A method with UVA 340 nm for 100 hours, respectively, and then measuring the tensile strength and elongation using a UTM facility. Table 2, polypropylene wrap, is shown in Table 3.

[Table 2]

[Table 3]

In the case of LDPE-C, LDPE-1, LDPE-2 and LDPE-3, which were treated in the experiment, did not show a significant decrease in tensile strength and elongation after UV treatment. It can be predicted that it will collapse into very small pieces.

In the case of PP, the tensile strength and elongation were not decreased after UV treatment. In case of PP-1 and PP-2, the physical properties of PP-1 and PP-2 decreased remarkably.

(3) Infrared spectroscopy (FT-IR)

C, LDPE-1, LDPE-2 and LDPE-3 after UV irradiation at 345 nm for UV irradiation were observed indirectly, indicating that the photo- Chemical composition changes were observed using FTIR (Perkin-Elmer 1760X). The impurities in the film were removed, washed with a sterilizing liquid for 2 hours, dried in a vacuum oven for 24 hours, and extracted with a Soxhlet extractor for 2 hours using p-xylene as an extraction solvent. The solution, which was removed and extracted, was placed in a vacuum oven, and all the solvent was evaporated. The remaining components were subjected to infrared analysis by making a 0.15 mm film using a 170 ° C hot press. All the samples of the biodegradation process were subjected to extraction in the same manner as above and the FTIR test was carried out with the remaining components. The results are shown in FIG.

As a result, the carbonyl absorption band at 1710 cm ^-1 was not observed in the film (a) which was not exposed to ultraviolet rays at all, whereas the carbonyl absorption band was observed in the film (b) after UV exposure. This is a sufficient proof that the polyethylene film of the Examples can induce photooxidative decomposition. In Fig. 3 (a) showing the change after UV exposure, a slight change can be observed, and it can be observed that the absorption band near 1710 cm ^-1 increases. This carbonyl absorption band is a functional group capable of sufficiently inducing the photo-oxidation effect by ultraviolet rays in the long wavelength region of 300 nm or more, and the increase of the carbonyl absorption band indicates that the photo-oxidation proceeds to the Norrish Type II process.

(4) Molecular weight reduction test

In comparative experiments of LDPE-1, LDPE-2 and LDPE-3, tensile strength and percent elongation were similar. In order to determine the lowest molecular weight reduction of LDPE-3 in terms of cost, it was treated with UV 345 nm for 400 hours, 500 hours and 600 hours according to ASTM D 5208-01 (Cycle C) The number-average molecular weight (Mn) and the weight-average molecular weight (Mw) were measured with the system shown in Table 4. After the UV treatment, it was confirmed that the molecular weight of the bio-polyethylene lap LDPE-3 was significantly reduced compared with that before the treatment. These results indicate that the long-chain polymer having a large molecular weight is automatically oxidized by light, and the chain is broken, resulting in a low molecular weight of a single chain. Such a low molecular weight polymer can be utilized by microorganisms, .

[Table 4]

1) Developing solvent: TCB + 0.04 BHT (after drying with 0.1% CaCl ₂ )

   Column: 2 x PLgel mixed-B (7.5 x 300 mm)

   Detector: RI detector

2) Mn: number average molecular weight

3) Mw: weight average molecular weight

(5) The film of the mold Degradability  exam

The degradability of LDPE-1 and LDPE-3 films was evaluated by the method of ASTM G21-96, and the procedure was as follows. Aspergillus niger, Penicillium pinophilum, Trichoderma virens , Aureobasidium There are pullulans . pullulans, Penicillium funiculosum 5 kinds of loop 1 of the fungal spore isolates formed after 2 subcultures every each medium as the platinum take a shaking the suspension is filtered so that the spores are difficult to remove loaves were isolated and then the mycelium. Each separated mycelium was placed in a sterile flask, and 1 mL of spore suspension containing 1,000,000 ± 200,000 spores was used as a final inoculum with 5 kinds of fungus mixed in the same amount. As a final inoculum, 13 × A film specimen of 80 mm in size was placed and the mixed spore suspension was sprayed to wet the entire specimen and the medium. Each treatment was incubated for 30 days at 28 to 30 DEG C and 85% relative humidity, and the degree of fungal growth was compared using a scanning electron microscope (XL30 ESEM-FEG).

4 (b) and 4 (d) show the scanning electron microscope photographs for observing the growth of the mold during the degradation test as compared to the LDPE-1 and LDPE-3 films before fungal inoculation of FIGS. 4 (a) As shown in the figure, after the fungal inoculation, a large amount of growth of fungi was observed on the surface of the LDPE-1 and LDPE-3 films, and it was observed that the fungi penetrated into the fine cracks. As can be seen from the theory of Cole (Agricultural and Synthetic Polymers, Graham Swift (ed.), P. 76. America Chemical Science 1988), microorganisms penetrate between the surface of a plastic film and a micropore, I can say that it is confirmed that it enters. From the results of observing the surface changes of these film specimens, it can be assumed that the microorganisms are consumed by the low molecular weight polymer over time, and the possibility of proceeding to complete biodegradation is sufficient.

(6) Film stability as a food packaging material

The oxidative biodegradable polyethylene wraps prepared from the examples were measured according to the regulations of KFDA based on the method of synthetic food of the standards and specifications of apparatus for food revolution, containers and packaging, and the results are shown in Table 5 below.

[Table 5]

As a result of the test, Pb, Cd, Hg and Cr ^{6 +} were less than 10 ㎎ / ㎏, which is the detection limit of the measuring equipment. In the dissolution test, heavy metals, potassium permanganate consumption, and total elution were found to be appropriate to the standard. Accordingly, it can be seen that the biodegradable film according to the present invention is well suited to packaging standards for food containers.

(7) Analysis of conformity test of primary food packaging materials in Europe

According to Dir 92/64 / EC packaging regulation of LFGB Regulation (EU) No 10/2011, the compatibility test of food packaging materials such as harmful components of oxidative biodegradable bio-polyethylene wraps prepared from the examples was carried out, The results are shown in Table 6 below. As a result of the test, 7 items were passed, and it was found that the direct contact with food meets the European standard for the certification of the first food packaging material.

[Table 6]

Review results

In the present invention, a biodegradation catalyst and oxidative biodegradable bio-polyethylene wraps have been developed.

As a result of comparing the tensile strength and elongation by dividing the type according to the presence or absence of the oxidative biodegradation catalyst,

Carbon neutral plant biomass is attracting attention because it does not increase the total amount of carbon dioxide in the earth. The biomass content of the biodegradation catalyst is 39% higher than the USDA standard 25%. As a result of the safety test of BioPolyethylene Wrap, it was found that it conformed to the standard of food packaging standard of Korea Food Pharmacy, and it was tested as a primary food packaging material in direct contact with food. As a result of the growth test by fungus in order to grasp the possibility of biodegradation, the fungi were actively grown and showed a possibility of complete biodegradation compared with the general polyethylene.

Compared with ordinary plastics, it can maintain its physical properties and price competitiveness. It has excellent physical properties and price competitiveness compared to conventional biodegradable plastics, confirming the possibility of mass production and industrialization.

The biodegradable catalyst and biodegradable bio-polyethylene woven fabric to which the biomass and biodegradation catalyst according to the present invention is applied are excellent in biodegradability and mechanical properties, and the organic carbon content of the biodegradation catalyst conforms to the standards of bio-based plastic standards such as the US Department of Agriculture , And biopolymer wraps made from biodegradable catalysts are also advantageous for export to the US. In particular, the company is likely to be able to export more volume in the future as it has price competitiveness similar to that of general labs sold in the US.

The biodegradable catalysts and bio-polyethylene wraps of the present invention can be applied to various product groups such as environment-friendly packaging including food packaging materials, bio-filaments for 3D printers, and the business ripple effect is expected to be great.

Claims (4)

For a total of 100 parts by weight of the biodegradable catalyst composition
0.1 to 2 parts by weight of acetyl carbamate metal salt;
1 to 5 parts by weight of an unsaturated fatty acid;
1 to 5 parts by weight of sodium bicarbonate; And
1 to 5 parts by weight of stearic acid;
≪ / RTI >
The method according to claim 1,
Wherein the acetyl carbamate metal salt is ferric acetyl carbamate, aluminum acetyl carbamate, manganese acetyl carbamate, or a mixture thereof.
A process for producing a biodegradation catalyst according to claim 1,
Each raw material component was put into a super mixer and mixed and dried while mixing until 400 RPM and 80 ± 5 ° C were reached,
The mixture was extruded using a conventional extrusion molding machine having a die diameter of 90 mm and L / D of 40 while maintaining the conditions of a screw temperature of 180 to 200 DEG C and a screw rotation speed of 500 RPM,
Cooled by air cooling or water cooling, and then cut into a pelletizer to produce a pellet-shaped biodegradation catalyst.
In polyethylene wraps configured to include linear low density polyethylene (LLDPE) and low density polyethylene (LDPE)
An oxidative biodegradable polyethylene wax, which is produced by adding 0.5 to 2 parts by weight of the biodegradable catalyst composition according to claim 1, based on the total weight of polyethylene.

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