KR100545271B1 - Aerobic biodegradable-agriculture mulching film and the producing method thereof - Google Patents

Abstract

The present invention relates to a biodegradable agricultural mulching film, in particular, a film extruded by mixing a biodegradable compound with a base polymer of synthetic resins such as polyethylene or polystyrene, which can biodegrade not only a biodegradable compound but also a base polymer. When coated on the floor, weeds can suppress weed growth and prevent pests, which can significantly reduce the use of pesticides, while being decomposed by microorganisms in a natural state after a certain period of time. It relates to a mulch film for sex agriculture.

Biodegradable Film, Base Polymer, Biodegradable, Mulching Film

Description

Eco-friendly biodegradable agricultural mulching film and its manufacturing method {Aerobic Biodegradable-Agriculture Mulching Film and the Producing Method etc}

The present invention relates to a biodegradable agricultural mulching film, in particular, a film extruded by mixing a biodegradable compound with a base polymer of a synthetic resin such as polyethylene or polystyrene, so that not only the biodegradable compound but also the base polymer can be biodegraded. When applied to the bottom of soil, weeds can suppress the growth of weeds and prevent pests, and can significantly reduce the use of pesticides, while being decomposed by microorganisms in a natural state after a certain period of time, thereby preventing environmental pollution. Biodegradable agricultural mulching film.

Rice farming is divided into two types of rice cultivation and field rice cultivation. Since rice cultivation is advantageous in many ways, the rice cultivation by watering the rice cultivation is advantageous in many respects. In addition, in the case of rice crops, seedlings are grown in ponds and planted in rice paddies, freshwater straight cultivation where seeds are seeded immediately after watering, and rice fields are stopped in a field state. It is divided into dry seed cultivation, which is seeded, and then watered after rice has grown to a certain extent. In Korea, most of the rice cultivation is cultivated, and in recent years, freshwater cultivation has been carried out on a small scale in some reclaimed lands. In the case of rice transplanting, the amount of water must be controlled by repeating the watering and draining for each growing season from the rice transplanting to the harvesting season.The pesticides such as various herbicides and insecticides are periodically removed several times to remove weeds and prevent pests. It must be used properly. However, recently, as the harmfulness of pesticides has been reported, consumers are reluctant to produce agricultural products using pesticides, and the demand for eco-friendly farming methods is increasing day by day as consumers' attention is shifted to organic or eco-friendly agricultural products. Silk, as well as paddy farming as well as various field farming, such problems still exist.

One of the eco-friendly farming methods is called mulching farming. Mulching is a material that covers the surface of the soil when growing crops, such as rice straw, barley straw, grass, etc. to cover the top of the soil to block the growth of weeds and prevent pests. It means a farming method to reduce the use of pesticides, to prevent soil erosion and to maintain soil moisture. However, such a farming method is a situation which is performed manually by field farming and is not applied to paddy farming. Moreover, in the case of field farming, since it is performed by hand, productivity falls and the question of the effectiveness is also raised.

And, in order to solve such a problem, there was no attempt to use a biodegradable resin film for field farming or paddy farming. However, conventional synthetic resins are made of synthetic resins such as polypropylene, polyethylene, or polystyrene as a base polymer, and starch is added thereto. Since the natural components may be decomposed, but the decomposition of the natural components may be possible, the biodegradation of the base polymer itself is not possible, so that the base polymer is not decomposed after use to cover the soil, thereby causing environmental pollution.

The present invention has been made in order to solve the problems of the prior art, the object of the present invention is to mix a predetermined amount of a biodegradable compound and a base polymer by exposure to ultraviolet rays or even when exposed to the outside or embedded in the soil by the microorganisms of the soil It is to provide a biodegradable agricultural mulching film that can be naturally decomposed and can be widely used in mulching methods.

The present invention is implemented by the embodiment having the following configuration in order to achieve the above object.

According to the first embodiment of the present invention, the eco-friendly biodegradable mulching film of the present invention, stearic acid, heavy calcium carbonate, vinyl ketone copolymer, polyethylene wax, lactose, ethyl acetate, methyl methacrylate, powdered milk, isobutyl The biodegradable compound mixed with alcohol, benzene and LMPE is mixed and processed to form a plastic resin, characterized in that formed by extrusion.

According to the second embodiment of the present invention, the eco-friendly biodegradable agricultural mulching film of the present invention, in the first embodiment, the biodegradable compound is 1 to 4% by weight stearic acid, 30 to 55% by weight heavy calcium carbonate, vinyl ketone Pore polymerization polymer 4-12 wt%, polyethylene wax 3-8 wt%, lactose 7-15 wt%, ethyl acetate 1-5 wt%, methyl methacrylate 1-7 wt%, powdered milk 10-20 wt%, It is characterized by consisting of 1 to 5% by weight of isobutyl alcohol, 1 to 4% by weight of benzene and 2 to 7% by weight of LMPE.

According to a third embodiment of the present invention, the eco-friendly biodegradable agricultural mulching film of the present invention, in the second embodiment, the biodegradable compound is 2% by weight stearic acid, 45% by weight heavy calcium carbonate, vinyl ketone copolymer polymer 7.5 Wt%, polyethylene wax 5%, lactose 11.8%, ethyl acetate 2.5%, methyl methacrylate 3%, milk powder 15.5%, isobutyl alcohol 1.8%, benzene 1.4% and LMPE 4.5% Characterized in that consisting of.

According to the fourth embodiment of the present invention, the eco-friendly biodegradable agricultural mulching film of the present invention, in the third embodiment, wherein the plastic resin is one of LDPE, LLDPE, HDPE, PSP and PP, or a mixture thereof. It features.

According to a fifth embodiment of the present invention, the eco-friendly biodegradable mulching film of the present invention, in the fourth embodiment, 40% by weight of the biodegradable compound is mixed with 12% by weight of LDPE and 48% by weight of LLDPE as a plastic resin It is characterized in that the extrusion.

According to a sixth embodiment of the present invention, the eco-friendly biodegradable agricultural mulching film manufacturing method of the present invention, in the method of manufacturing the eco-friendly biodegradable agricultural mulching film of the first embodiment to the fifth embodiment, the method comprises a biodegradable compound Comprising the biodegradable compound generating step and the film generating step of producing an eco-friendly biodegradable agricultural mulching film by mixing the plastic resin with the biodegradable compound,

The biodegradable compound generation step is a first step of mixing stearic acid, heavy calcium carbonate and methyl methacrylate at 110 ℃, vinyl ketone copolymer, polyethylene wax, powdered milk, isobutyl alcohol and benzene at 40 ℃ After mixing the second step of mixing, the third step of mixing the lactose and ethyl acetate at 40 ℃ and the first, second and third produced at 90 ℃ again by adding LMPE It consists of a fourth step of extruding with an extruder,

The film producing step is characterized in that the biodegradable compound and the plastic resin produced by the biodegradable compound generating step is added to the extruder hopper to form a film.

According to the seventh embodiment of the present invention, the eco-friendly biodegradable agricultural mulching film manufacturing method of the present invention, in the sixth embodiment, the fourth step of the biodegradable compound production step is 180 ℃, 190 ℃ and 210 in the extruder hopper It is characterized in that the extruded while heating in order.

According to an eighth embodiment of the present invention, the eco-friendly biodegradable agricultural mulching film manufacturing method of the present invention, in the seventh embodiment, the film generation step is 180 ~ 190 ℃, 190 ℃ ~ 210 ℃ and 220 ℃ in the extruder hopper It is characterized in that the extruded while being heated in sequence.

Applicants describe preferred embodiments of the present invention described below.

Eco-friendly biodegradable mulching film of the present invention, stearic acid, heavy calcium carbonate, vinyl ketone copolymer copolymer, polyethylene wax, lactose, ethyl acetate, methyl methacrylate, powdered milk, isobutyl alcohol, benzene and LMPE mixed biodegradable The plastic resin is mixed with the compound and then extruded. Here, polyethylene wax refers to a high melting point polyethylene wax produced as a by-product during the synthesis of polyethylene. Stearic acid, polyethylene wax, ethyl acetate, isobutyl alcohol and benzene are added as processing additives to improve processability, such as intermolecular binding, surface beauty. Vinyl ketone copolymer polymerization polymer is provided in the form of a mass batch and is a light additive that promotes oxidation of the film by condensing upon ultraviolet irradiation. Lactose, methyl methacrylate and powdered milk promote biodegradation of the film. In addition, LMPE serves to improve the binding force between molecules and plastic resin is added as a base polymer to secure mechanical properties (tear strength, tensile strength, etc.) of the film. Here, the plastic resin is any one of LDPE, LLDPE, HDPE, PP, PSP, PE, or a predetermined amount thereof. LDPE stands for low density polyethylene as an abbreviation for Low Density Polyethylene, HDPE stands for high density polyethylene as an abbreviation for High Density Polyethylene, LLDPE stands for linear low density polyethylene as an abbreviation for Linear Low Density Polyethylene, PP is polypropylene as an abbreviation for Polypropylene, PSP stands for Polystyrene Paper. In addition, LMPE stands for Low Molecular Polyethylene, which means low molecular polyethylene. General HDPE and LDPE have a molecular weight of 10,000 or more, but LMPE is formed at a low molecular weight of 2000 ~ 2500 to induce a smooth fusion operation such as CaCo ₃ when manufacturing a product, and the composition is made of polyethylene wax.

Hereinafter, look at the experimental example of the present embodiment.

Preparation of Sample

2% by weight of stearic acid, 45% by weight of heavy calcium carbonate and 3% by weight of methyl methacrylate were added to a high speed mixer (40KW, 1480RPM) and mixed for 40 minutes under an internal temperature of 110 ° C to produce a first material, and a vinyl ketone copolymer polymer 7.5% by weight, 5% by weight of polyethylene wax, 15.5% by weight of powdered milk, 1.8% by weight of isobutyl alcohol and 1.4% by weight of benzene were added to a high speed mixer and mixed at 40 ° C. for 30 minutes to produce a second substance. 11.8% by weight of lactose 2.5% by weight of ethyl acetate was added to the mixer and mixed at 40 ° C. for 20 minutes to produce a third material.

Then, the first material, the second material and the third material in a high-speed mixer (40KW, 1300RPM) and mixed for 30 minutes at 90 ℃ and after 60 minutes the LMPE 4.5wt% was added to the crystal obtained by opening the mixer extruder Put into hopper (37KW). Here, the extruder has a double skew type and its length / diameter ratio is 28: 1 or more, and the heating bowl is maintained at 180 ° C for sections 1-4, 190 ° C for sections 5-8, and 210 ° C for sections 9-12. do. In addition, the wire screen is installed horizontally at the rear end of the extruder ejection mold to remove foreign substances during the operation of the equipment so that they can be replaced once every 8 hours.The biodegradable compound is held through 30 hold diameters of 2.5mm on the front disc of the extruder. Discharge.

Then, the discharged biodegradable compound is cut into an elliptical thickness of 0.3 ~ 0.5mm by four rotary cutters and is transported 14m through a duct 300 diameter by the wind power of the blower. And it is cooled in the transport process to complete the biodegradable compound.

Subsequently, 40% by weight of the above biodegradable compound was added to the extruder hopper together with 12% by weight of LDPE and 48% by weight of LLDPE as a base polymer, followed by heating bowl 180-190 ° C, heating tee 190 ° C-210 ° C, and heating top 220 ° C. While maintaining a thickness of 0.01 ~ 0.02mm eco-friendly biodegradable agricultural mulching film (Test Example 1) was produced.

Then, the following sample was further produced by only changing the base polymer.

(1) Test Example 2 to Comparative Example 2

PP film (Comparative Example 2) to which the present biodegradable compound was not added, and a film (Test Example 2) to which 5 wt% of the biodegradable compound was added were prepared.

(2) Test Example 3 to Comparative Example 3

The film of PSP material (Comparative Example 3) to which the present biodegradable compound was not added (Comparative Example 3) and the film to which 7 wt% of the biodegradable compound was added were prepared, respectively.

(3) Test Example 4 to Comparative Example 4

The PE film without the present biodegradable compound (Comparative Example 4) and the film with the biodegradable compound added 5% by weight (Test Example 4) were prepared, respectively.

Experiment 1: Aerobic Biodegradability Test of Plastics in Composting Conditions

Applicant requested the experiment from Korea Testing and Research Institute and summarizes the report as follows.

1. Material Composition Analysis

(1) Material test sample

Before conducting biodegradability test, elemental analysis (NCHO) was conducted on the sample to be tested, and the test sample was designated according to the Ministry of Environment's notification of biodegradable synthetic resin testing institute of 2004-110. By cutting the sample of Test Example 1 was prepared as shown in Figure 1 below.

<Picture 1>

(2) Material testing equipment and method

An element analyzer with model name EA1110 Element Analyes System (CE Instrumnets Co., Italy) is used.

N, C, H among the elemental components were analyzed by TCD detector after pyrolysis of 1mg of material test sample at 1800 ℃, and the remaining component O was analyzed by TCD detector after pyrolysis of 1mg of material test sample at 1000 ℃. do.

(3) Material test result

Test Items N C H O weight% 0.00 83.6 13.1 3.17

2. Biodegradation test

(1) Biodegradable city materials

   The sample of Test Example 1 was cut into 2 × 2 cm size to prepare a biodegradability test sample as shown in Figure 2 below.

<Picture 2>

(2) Test principle and method

The biodegradability test sample was measured by measuring the amount of carbon dioxide generated during the aerobic composting process according to the Korean Industrial Standard KSM 3100-1 "Measuring Aerobic Biodegradability and Disintegration Degree of Plastics in Composting Conditions". Measure

Here, compost is an organic substance that controls a soil composed of a mixture of vegetable residues obtained by biodegradation and other organic substances and certain inorganic components. And, composting means aerobic process for composting.

Principle of test is to put the sample and standard materials in the compost and fix it in the composting container. In addition, by measuring the amount of carbon dioxide generated in the composting process continuously or periodically, the degree of biodegradation is determined by the ratio between the theoretical maximum carbon dioxide generation amount and the actual carbon dioxide generation amount of the sample and the standard material. Here, the theoretical maximum carbon dioxide generation amount (ThCO ₂ ) is calculated from the total organic carbon content of the sample or standard material, the total organic carbon content is determined by the material component analysis described above, and the theoretical maximum carbon dioxide generation amount is determined by the following formula. Is calculated.

ThCO ₂ = M _TOT × C _TOT × 12/44

M _TOT : Total dry solids (g) of test substances added to the compost at the beginning of the test.

C _TOT : percentage of organic carbon in the total dry solids of the test substance (g / g)

44: molecular weight of carbon dioxide 12: molecular weight of carbon

In addition, the actual amount of carbon dioxide generated is measured by capturing carbon dioxide generated in a state of being directly connected to each composting vessel in a transparent glass tube containing potassium hydroxide and barium chloride mixed aqueous solution in a 1: 1 manner. All of these facts are described in detail in the above Korean Industrial Standards, and further explanations are omitted.

(mole 단위)

(mole unit)

(mg 단위)

in mg

And biodegradability is computed based on the following formula.

(CO ₂ ) Cumulative amount of carbon dioxide generated from a sample or standard during _t = t hours

(CO ₂ ) _b = the cumulative amount of carbon dioxide produced in the compost only container

D _t : Biodegradability during t hours

All the above descriptions are based on Korean Industrial Standard KSM 3100-1.

(3) Characterization of compost

Compost was prepared by Sangmyung University and prepared through a two-month composting period.

 division  Moisture (wt%)  pH   Solid content (wt%)    Elemental Analysis (wt%)     C / N ratio  Total dry solids  Volatile Solids  N  C   H   O    compost  48.0   8.1   52.0  15.0 0.00 21.1 1.90 20.8    30.1     Remarks Maintain about 50% during test period  Within 7.0 ~ 9.0  Within 50 to 55% of wet solids  Within 15% of wet solids            -   10-40 suitable    Test Methods Waste Process Test Act Deionized Water: Compost = 5: 1   Waste Process Test Method       Elemental analyzer   Fertilizer Test

Table 1: Composting Table

Here, the total dry solids is the amount of solids obtained after drying the compost to yield a constant amount at 105 ℃, volatile solids is the amount of solids obtained after subtracting the residue after incineration at 550 ℃ from the total dry solids. Volatile solids are an indicator of organic matter content.

As shown in the 'remarks' column of the above table, the above-mentioned compost content of water, acidity, solids, and C / N ratio are all within the standard range, and therefore, it is considered that the compost requirements required by the Korean Industrial Standards are met.

(4) Determination of Biodegradability of Test Example 1 and Standards

Three samples of Test Example 1 described above were fixed together with gastric compost and placed in three composting containers, respectively, and observed for 59 days. In addition, TLC grade cellulose of 20 μm or less was used as a standard material, which was fixed with stomach compost and placed in a composting container for observation for 59 days. In addition, only the compost without the specimen or standard material was placed in the composting container and observed for 59 days. For each case, the average value of the CO2 that is measurement of the carbon dioxide emissions daily occurred in three manure per vessel (CO ₂₎ calculated on the basis of _Bmean in the formula above, and further the mean value (D _t) of biodegradability is also calculated The results are shown in the graph below.

                        <Graph 1 Carbon Dioxide>

                             <Graph 2 Biodegradation>

According to the above graph 1, it can be seen that the amount of carbon dioxide generated in the compost fixing the test example 1 is higher than that of the other compost, and as time passes, the amount of carbon dioxide is gradually increased, indicating that biodegradation is in progress. In addition, according to Graph 2, although the amount of carbon dioxide generation or biodegradation is lower than that of cellulose, which is a standard substance, the test example 1 is gradually increasing as time passes, such as cellulose. .

And, comparing the biodegradation of the standard material and the specimen at 59 days as shown in Table 2 below.

  division  Average biodegradation (%) calculated by carbon dioxide emissions   Test period         Observation   Test substance 38.1       59 days   There were no changes in compost status, moisture content, color, bacterial growth, or smell.   Standard material            72.8 Compared to Standards            52.4

Table 2: Comparison Table of Biodegradability at 59 Days

As shown in Table 2 above, Test Example 1 showed a biodegradability of 38.1% at 59 days, and the biodegradability reached 52.4% of the standard cellulose.

Experiment 2: Determination of biodegradation by MITI method

(1) Experimental method

After collecting from more than 10 sludge, compost and soil, and mixed with the culture medium once a day for 10 days or more were used as inoculation microorganisms.

In addition, the amount of oxygen consumed in the process of inoculating microorganisms during the decomposition of the polymer was measured using a respirometer.

In this experiment, the same cellulose was used as the standard material as in Experiment 1.

(2) Experiment result

Oxygen consumption measured by respirometer (mg / L) is shown in Table 3 below.

Day Standard material (cellulose)   Comparative Example 2   Test Example 2   Comparative Example 3   Test Example 3   Comparative Example 4   Test Example 4     One    60     0     0     0     0     0     0     2   176.2     0    1.2     0     0     0     0     3   271.4     0    1.2    23.7     0     0     0     4   336.6    4.9    1.2    41.8   30.5     0     0     5   439.7    7.3    1.2    41.8   69.1     0     0     6   557.2    7.3    1.2    41.8   92.9     0     0     7   618.5    7.3    1.2    41.8   95.6     0     0     8   618.5    7.3    1.2    41.8   95.6     0     0     9   651.1    7.3     5    41.8   95.6     0     0    10   695.5    7.3     5    43.2   164.6    1.2    1.2    11   747.7    7.3     5    43.2   173.9    1.2    1.2    12   806.4    7.3     5    43.2   185.9    1.2   37.1    13   914.7    7.3    8.8    43.2   219.1    1.2   45.8    14   977.3    7.3    16.3    43.2   233.7    1.2   56.9    15   977.3    7.3    16.3    43.2   233.7    1.2   56.9

[Table 3: Oxygen consumption]

According to the above table, Experimental Examples 2 to 4 was confirmed that the oxygen consumption is lower than the reference material, but significantly higher than Comparative Examples 2 to 4.

Experiment 3: Determination of Biodegradability at Outdoor Site

(1) Experimental method

After Comparative Examples 2 to 4 and Test Examples 1 to 4 were deposited in rivers and soils for 30 days, the degree of biodegradation was measured by weight loss rate, SEM and AFM, and the change in the surface of the sample was measured. A sample was taken and observed under a microscope to confirm the presence of bacteria.

(2) Experiment result

1) weight loss rate

In each case, the weight loss rate was calculated and the results are shown in Table 4 below.

division River soil Standard material 100 100 Comparative Example 2 0 0.3 Comparative Example 3 0 1.5 Comparative Example 4 0 0 Test Example 2 3.6 4.8 Test Example 3 1.4 2.3 Test Example 4 0.6 2.7 Test Example 1 28.2 30.1

[Table 4: Comparison of weight reduction rate]

As shown in Table 4 above, it was confirmed that the weight loss rate is higher than Comparative Examples 2 to 4 with the addition of the biodegradable compound was not added. In particular, Test Example 1 showed a high weight loss rate compared to Test Examples 2 to 4 because the ratio of the biodegradable compound is higher than Test Examples 2 to 3, it was easy to confirm that the biodegradation is in progress even with the naked eye.

2) change of surface roughness of sample through SEM and AFM

The surface roughness change was compared with only Comparative Example 2 and Test Example 2 for convenience, and the results are shown below.

Three-dimensional surface shape of Comparative Example 2 and Test Example 2 measured by AFM

division Deposition soil River Comparative Example 2

Test Example 2

After 30 days of immersion, it can be seen that the sample surface of Test Example 2 is rougher than that of Comparative Example 2 in both soil and rivers.

Average Roughness Values of Comparative Example 2 and Test Example 2 Measured on AFM

division Deposition soil River Comparative Example 2 12.4 18.4 15.3 Test Example 2 10.0 69.9 68.8

After 30 days of immersion, it can be confirmed that the surface roughness value of Test Example 2 is higher than that of Comparative Example 2.

3) Microscopic observation of sample surface

As a result of microscopic observation of the bacteria present on the surface of the sample of Comparative Example 2 and Test Example 2, the sample deposited on the soil was found, compared to Comparative Example 2 on the surface of Test Example 2 as shown in the figure below. It can be seen that bacteria inhabit the biofilm.

      <Comparative Example 2> <Test Example 2>

As confirmed in the above Experiments 1 to 3, Experimental Examples 1 to 4 was confirmed experimentally that the carbon dioxide generation amount, oxygen consumption amount, surface roughness or the degree of habitat of bacteria is higher than Comparative Examples 2 to 3. In particular, in Test Example 1, the biodegradability was close to about 38.1% in 59 days, which was a surprising result compared to Comparative Examples 2 to 4 that do not decompose in the natural state.

The present invention is mixed with a predetermined amount of a biodegradable compound and a base polymer, even if exposed to the outside by irradiation of ultraviolet rays or embedded in the soil, biodegradable compounds as well as the base polymer can be biodegradable by microorganisms of the soil, etc. Has the effect that it can be used.

Claims (8)

Stearic acid, heavy calcium carbonate, vinyl ketone copolymer polymerization polymer, polyethylene wax, lactose, ethyl acetate, methacrylate, powdered milk, isobutyl alcohol, benzene and LMPE are mixed and extruded after mixing plastic resin with biodegradable compound Biodegradable agricultural mulching film formed. According to claim 1, wherein the biodegradable compound is 1 to 4% by weight of stearic acid, 30 to 55% by weight heavy calcium carbonate, 4 to 12% by weight of vinyl ketone copolymer copolymer, 3 to 8% by weight of polyethylene wax, 7 to 15 lactose Wt%, ethyl acetate 1-5%, methyl methacrylate 1-7%, powdered milk 10-20%, isobutyl alcohol 1-5%, benzene 1-4%, LMPE 2-7% Eco-friendly biodegradable mulching film, characterized in that consisting of. According to claim 2, wherein the biodegradable compound is 2% by weight of stearic acid, 45% by weight of heavy calcium carbonate, 7.5% by weight of vinyl ketone copolymer copolymer, 5% by weight of polyethylene wax, 11.8% by weight of lactose, 2.5% by weight of ethyl acetate, methyl Eco-friendly biodegradable agricultural mulching film, comprising 3% by weight of methacrylate, 15.5% by weight of powdered milk, 1.8% by weight of isobutyl alcohol, 1.4% by weight of benzene and 4.5% by weight of LMPE. The biodegradable mulching film of claim 3, wherein the plastic resin is any one of LDPE, LLDPE, HDPE, PSP and PP, or a mixture thereof. The mulching film for eco-friendly biodegradable agriculture according to claim 4, wherein the biodegradable compound is extruded by mixing 12% by weight of LDPE and 48% by weight of LLDPE with a plastic resin. In the method for producing an eco-friendly biodegradable agricultural mulching film of any one of claims 1 to 5, the method comprises the step of producing a biodegradable compound to produce a biodegradable compound, and by mixing a plastic resin with the biodegradable compound environmentally friendly biodegradation It consists of a film generation step to produce an agricultural mulching film, The biodegradable compound generation step is a first step of mixing stearic acid, heavy calcium carbonate and methyl methacrylate at 110 ℃, vinyl ketone copolymer, polyethylene wax, powdered milk, isobutyl alcohol and benzene at 40 ℃ The second step, and the third step of mixing the lactose and ethyl acetate at 40 ℃, and the mixture produced by the first step, the second step and the third step again at 90 ℃ and then added LMPE extruder The fourth step of extruding The film producing step is a biodegradable compound produced by the step of producing a biodegradable compound and a plastic resin together in the extruder hopper to form a film-like manufacturing method for eco-friendly biodegradable agricultural mulching film, characterized in that. The method of claim 6, wherein the fourth step of the biodegradable compound generation step is extruded while being heated in the order of 180 ℃, 190 ℃ and 210 ℃ in the extruder hopper. 8. The method of claim 7, wherein the film producing step is extruded while being heated in the order of 180 ~ 190 ℃, 190 ℃ ~ 210 ℃ and 220 ℃ in the extruder hopper.