KR101875603B1 - Resin composition for biodegradable agricultural mulching film having the function of soil conditioning and fertilizing and the biodegradable agricultural mulching film using the same - Google Patents

Abstract

The present invention relates to a resin composition for a biodegradable agricultural mulching film having soil conditioning and fertilizer functions, and the biodegradable agricultural mulching film manufactured by using the same. More specifically, the resin composition comprises: a thermoplastic starch (TPS); one or more biodegradable resins selected from the group consisting of poly(butylene adipate-co-terephthalate (PBAT), poly(butylene succinate (PBS), poly(butylene succinate-co-adipate (PBSA), polylactic acid (PLA), and polyhydroxyalkanoate (PHA); and a filler including a sulfur powder, an illite powder, a calcium carbonate powder, and an expanded vermiculite powder.

Description

TECHNICAL FIELD The present invention relates to a resin composition for a biodegradable agricultural mulching film having a soil improving and fertilizer function and a biodegradable agricultural mulching film prepared using the same. same}

The present invention relates to a resin composition for a biodegradable agricultural mulching film having a soil improving and fertilizer function, and a biodegradable agricultural mulching film produced using the resin composition. More particularly, the present invention relates to a thermoplastic starch (TPS); Butylene succinate-co-adipate (PBT), poly (butylene succinate), poly (butylene succinate-co-adipate At least one biodegradable resin selected from the group consisting of polyvinylpyrrolidone (PBSA), polylactic acid (PLA), and polyhydroxyalkanoate (PHA); and at least one biodegradable resin selected from the group consisting of sulfur powder, sunlight powder, calcium carbonate powder, The present invention relates to a biodegradable resin composition for agricultural mulching film having a soil improving and fertilizer function and a biodegradable agricultural mulching film prepared using the resin composition.

Currently, as it is widely used in farmhouses, when cultivating crops, it is necessary to cover the surface of the soil to prevent the soil from being eroded by moisture in the soil or by raindrops during rainfall, to control the geothermal temperature, to suppress the growth of weeds, And to reduce the use of herbicides or pesticides, agricultural mulching films have been used as a result.

Such agricultural mulching films are mostly made of a material such as polyethylene or polyvinyl chloride. However, although the agricultural mulching film contributed greatly to the increase of agricultural productivity in Korea, it has been recognized as a factor that pollutes the environment of the farming village without being exposed to the soil due to difficulty in recycling after use. Therefore, biodegradable film is used as agricultural mulching film There was an attempt to use it.

Korean Patent Registration No. 10-0545271 (Jan. 16, 2006) discloses a method for producing a polyvinyl alcohol resin composition comprising stearic acid, heavy calcium carbonate, a vinyl ketone copolymer polymer, a polyethylene wax, lactose, ethyl acetate, methyl methacrylate, Low Density Polyethylene (LDPE), Linear Low Density Polyethylene (LLDPE), and High Density Polyethylene (LMPE) are added to biodegradable compounds obtained by mixing alcohol, benzene and low molecular polyethylene (LMPE). There is known an eco-friendly biodegradable agricultural mulching film formed by mixing and processing one or more plastic resins selected from HDPE, polystyrene paper (PSP) and polypropylene (PP), and extruding.

In Korean Patent No. 10-1472990 (Dec. 09, 2014), the pulp and the natural reinforcing fiber are dissociated so that the natural reinforcing fibers are distributed in the free direction on the pulp, And a mineral coating layer for blocking sunlight is formed on one side of the mulching paper, and the mineral coating layer is formed on one side of the mulching paper by drying and compressing the auxiliary reinforcing cloth on both sides spaced a predetermined distance from the middle part of the wet paper, And the biodegradable coating layer is formed by mixing 8 to 10 parts by weight of wood vinegar, 8 to 10 parts by weight of plant synthetic nutrients, 2 to 4 parts by weight of germanium powder and 3 to 5 parts by weight of natural adhesive in 100 parts by weight of water Which is characterized in that the natural environment-friendly decomposition mulching soil for agricultural use is known.

However, the mulching films are produced by using a synthetic resin such as polypropylene, polyethylene, or polystyrene as a base polymer or a pulp reinforcing agent and mixing or coating biodegradable components thereof as an additive. It is possible to decompose biodegradable components, There is a limitation that biodegradation of the polymer itself or the reinforcing fiber constituting the film is impossible and ultimately there is a fundamental problem that the mulching film is not decomposed.

As a method for solving such a problem, Korean Patent Laid-Open No. 10-2008-0033620 (Apr. 17, 2008) discloses an additive composition for spontaneous decomposition of a polyolefin thermoplastic polymer, which comprises (a) (B) a polysaccharide such as polylactic acid (PLA), polycaprolactone (PCL), and aliphatic polyester (AP), waxes, and the like, from 10 to 30% by weight of a conventional thermoplastic polymer component Or a mixture of two or more thereof, and (c) one or more of one or more of unsaturated fatty acids, liquid cooking oil, organic acids, saccharides, or a mixture of two or more thereof. 0.1% to 5% by weight of an oxidation reaction promoter which reacts to form a peroxide or a hydroperoxide, (d) one of iron stearate and copper stearate, From 0.1 wt% to 3 wt% of a catalyst which acts as a catalyst of the oxidation reaction promoter, and (e) an oxidation reaction selected from the group consisting of clay minerals, calcium carbonate, talc, ilite and zeolite A polymer having a hydrophilic group consisting of one or more of a polyvinyl alcohol (PVA), a polyacrylic acid (PAA), and a polyethylene acrylic acid (PEAA) in an amount of from 0.5% by weight to 15% Based on the weight of the thermoplastic polymer, is capable of degrading the thermoplastic polymer product in a natural state. The additive composition for decomposing a polyolefin thermoplastic polymer is known.

Korean Patent Laid-Open No. 10-2014-0106882 (September 04, 2014) discloses a polylactic acid composition containing more than 0% by weight and less than 10% by weight of polylactic acid; 30% by weight or more and 70% by weight or less of polybutylene adipate terephthalate; From 0 to 30% by weight of thermoplastic starch; And a soil improving agent in an amount of 0.1 wt% or more and 10 wt% or less; and agricultural mulching films prepared using the biodegradable resin composition.

Korean Patent Laid-Open No. 10-2017-0075052 (Jul. 03, 2017) discloses (i) a biodegradable resin; (Ii) a starch in which at least one of the hydroxyl groups (-OH groups) in the glucose unit is hydrophobically treated with silane; And (iii) a graft copolymer obtained by grafting maleic anhydride (MA) to a biodegradable polymer, a polyfunctional compound having an epoxidized oil and an epoxy group, or a compatibilizer selected from the group consisting of Wherein the biodegradable resin is selected from the group consisting of poly (butylene adipate-co-terephthalate), poly (butylene terephthalate), polybutylene succinate butylene succinate (PBS), poly (butylene succinate-co-adipate), PBSA), polylactic acid (PLA) and polyhydroxyalkanoate A resin composition for a mulching film and a mulching film prepared using the resin composition are known.

However, although the above-mentioned patents can be widely used eco-friendly by natural decomposition at a high speed by microorganisms such as soil, the mechanical properties such as tensile strength and tensile elongation are drastically lowered before reaching the crop harvesting time, In this case, the mulching film can not withstand the force of stepping on the crop during the cultivation of the crop, and the mulching film is partially torn.

Therefore, the present inventors have found that, in order to solve the problems of the mulching films, the present inventors have found that, during the period required for harvesting crops, they have excellent mechanical properties, have an appropriate biodegradation rate and can improve the soil during biodegradation and the effect of fertilizer Thermoplastic starch (TPS); Butylene succinate-co-adipate (PBT), poly (butylene succinate), poly (butylene succinate-co-adipate At least one biodegradable resin selected from the group consisting of polyvinylpyrrolidone (PBSA), polylactic acid (PLA), and polyhydroxyalkanoate (PHA); and at least one biodegradable resin selected from the group consisting of sulfur powder, sunlight powder, calcium carbonate powder, A resin composition for a biodegradable agricultural mulching film having a soil improving function and a fertilizer function and a biodegradable agricultural mulching film prepared using the same, and completed the present invention.

[Patent Document 1] Korean Patent Registration No. 10-0545271 (Jan. 16, 2006) [Patent Document 2] Korean Patent Registration No. 10-1472990 (December 09, 2014) [Patent Document 3] Korean Published Patent Application No. 10-2008-0033620 (Apr. 17, 2008) [Patent Document 4] Korean Published Patent Application No. 10-2014-0106882 (September 04, 2014) [Patent Document 5] Korean Published Patent Application No. 10-2017-0075052 (Jul. 03, 2017)

In order to solve the above problems, it is an object of the present invention to provide a fertilizer which has excellent mechanical properties during a period of time required for harvesting crops, has an appropriate biodegradation rate, exhibits a fertilizer effect for improving the soil during biodegradation, Thermo plastic starch (TPS); Butylene succinate-co-adipate (PBT), poly (butylene succinate), poly (butylene succinate-co-adipate At least one biodegradable resin selected from the group consisting of polyvinylpyrrolidone (PBSA), polylactic acid (PLA), and polyhydroxyalkanoate (PHA); and at least one biodegradable resin selected from the group consisting of sulfur powder, sunlight powder, calcium carbonate powder, A resin composition for a biodegradable agricultural mulching film having a soil improving and fertilizer function and a biodegradable agricultural mulching film prepared using the same.

In order to solve the above-described problems, the present invention provides a thermoplastic resin composition comprising 20 to 50 parts by weight of a thermoplastic starch (TPS) Butylene succinate-co-adipate (PBT), poly (butylene succinate), poly (butylene succinate-co-adipate 50 to 80 parts by weight of at least one biodegradable resin selected from the group consisting of PBSA, polylactic acid (PLA) and polyhydroxyalkanoate (PHA), and at least one biodegradable resin selected from the group consisting of sulfur powder, Calcium phosphate and 5 to 15 parts by weight of a filler comprising expanded vermiculite powder. The present invention also provides a resin composition for a biodegradable agricultural mulching film having a soil improving function and a fertilizer function.

The filling agent is a solution of the problem that the sulfur powder, the sodium chloride powder, the calcium carbonate powder and the expanded vermiculite powder are mixed in a weight ratio of 0.5: 0.5: 1: 0.5.

The resin composition for a mulching film is further comprised of 5 to 10 parts by weight of dry powder of a lake, a stream or a water treatment plant sludge.

Also included are 20 to 50 parts by weight of a thermoplastic starch (TPS); Butylene succinate-co-adipate (PBT), poly (butylene succinate), poly (butylene succinate-co-adipate 50 to 80 parts by weight of at least one biodegradable resin selected from the group consisting of PBSA, polylactic acid (PLA) and polyhydroxyalkanoate (PHA), and at least one biodegradable resin selected from the group consisting of sulfur powder, And 5-15 parts by weight of a filler comprising calcium powder and expanded vermiculite powder. The present invention provides a biodegradable agricultural mulching film using the resin composition for biodegradable agricultural mulching films having a soil improving and fertilizer function.

20 to 50 parts by weight of the thermoplastic starch (TPS); Butylene succinate-co-adipate (PBT), poly (butylene succinate), poly (butylene succinate-co-adipate 50 to 80 parts by weight of at least one biodegradable resin selected from the group consisting of PBSA, polylactic acid (PLA) and polyhydroxyalkanoate (PHA), and at least one biodegradable resin selected from the group consisting of sulfur powder, 5 to 15 parts by weight of a filler containing calcium powder and expanded vermiculite powder are mixed in a twin extruder at 160 to 200 ° C and then extruded in a thickness of 0.2 to 0.5 mm to prepare a biodegradable agricultural And a method for producing a biodegradable agricultural mulching film using the resin composition for a mulching film.

The filling agent is a solution of the problem that the sulfur powder, the sodium chloride powder, the calcium carbonate powder and the expanded vermiculite powder are mixed in a weight ratio of 0.5: 0.5: 1: 0.5.

The resin composition for a mulching film is further comprised of 5 to 10 parts by weight of dry powder of a lake, a stream or a water treatment plant sludge.

The biodegradable agricultural mulching film resin composition having the soil improving and fertilizer function of the present invention and the biodegradable agricultural mulching film prepared using the resin composition for agricultural mulching film according to the present invention comprises thermoplastic starch (TPS); Butylene succinate-co-adipate (PBT), poly (butylene succinate), poly (butylene succinate-co-adipate At least one biodegradable resin selected from the group consisting of polyvinylpyrrolidone (PBSA), polylactic acid (PLA), and polyhydroxyalkanoate (PHA); and at least one biodegradable resin selected from the group consisting of sulfur powder, sunlight powder, calcium carbonate powder, It has excellent mechanical properties, has an appropriate biodegradation rate, exhibits excellent effect of fertilizer which improves the soil during the biodegradation and activates the growth of the crops, during the period required for the harvesting of the crops including the filler including the powder have.

The present invention relates to a thermoplastic elastomer composition comprising 20 to 50 parts by weight of a thermoplastic starch (TPS) Butylene succinate-co-adipate (PBT), poly (butylene succinate), poly (butylene succinate-co-adipate 50 to 80 parts by weight of at least one biodegradable resin selected from the group consisting of PBSA, polylactic acid (PLA) and polyhydroxyalkanoate (PHA), and at least one biodegradable resin selected from the group consisting of sulfur powder, And 5-15 parts by weight of a filler containing calcium powder and expanded vermiculite powder. The resin composition for a biodegradable agricultural mulching film having a soil improving function and a fertilizer function is characterized in the technical construction.

The filler is characterized in that the sulfur powder, the diatomite powder, the calcium carbonate powder and the expanded vermiculite powder are mixed at a weight ratio of 0.5: 0.5: 1: 0.5.

The resin composition for a mulching film may further comprise 5 to 10 parts by weight of dry powder of a lake, a stream or a water purification plant sludge.

Also included are 20 to 50 parts by weight of a thermoplastic starch (TPS); Butylene succinate-co-adipate (PBT), poly (butylene succinate), poly (butylene succinate-co-adipate 50 to 80 parts by weight of at least one biodegradable resin selected from the group consisting of PBSA, polylactic acid (PLA) and polyhydroxyalkanoate (PHA), and at least one biodegradable resin selected from the group consisting of sulfur powder, And a filler containing 5 to 15 parts by weight of a filler including calcium powder and expanded vermiculite powder. The biodegradable agricultural mulching film using the resin composition for biodegradable agriculture mulching film having a soil improvement and fertilizer function is characterized in the technical construction.

20 to 50 parts by weight of the thermoplastic starch (TPS); Butylene succinate-co-adipate (PBT), poly (butylene succinate), poly (butylene succinate-co-adipate 50 to 80 parts by weight of at least one biodegradable resin selected from the group consisting of PBSA, polylactic acid (PLA) and polyhydroxyalkanoate (PHA), and at least one biodegradable resin selected from the group consisting of sulfur powder, 5 to 15 parts by weight of a filler containing calcium powder and expanded vermiculite powder are mixed in a twin extruder at 160 to 200 ° C and then extruded in a thickness of 0.2 to 0.5 mm to prepare a biodegradable agricultural A method of producing a biodegradable agricultural mulching film using a resin composition for a mulching film is characterized by its technical constitution.

The filler is characterized in that the sulfur powder, the diatomite powder, the calcium carbonate powder and the expanded vermiculite powder are mixed at a weight ratio of 0.5: 0.5: 1: 0.5.

The resin composition for a mulching film may further comprise 5 to 10 parts by weight of dry powder of a lake, a stream or a water purification plant sludge.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, in which the present invention can be easily carried out by those skilled in the art. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

,

First, the resin composition for a biodegradable agricultural mulching film having a soil improving and fertilizer function of the present invention comprises 20 to 50 parts by weight of a thermoplastic starch (TPS); Butylene succinate-co-adipate (PBT), poly (butylene succinate), poly (butylene succinate-co-adipate 50 to 80 parts by weight of at least one biodegradable resin selected from the group consisting of PBSA, polylactic acid (PLA) and polyhydroxyalkanoate (PHA), and at least one biodegradable resin selected from the group consisting of sulfur powder, 5 to 15 parts by weight of a filler comprising calcium powder and expanded vermiculite powder.

In the present invention, thermostable starches are predominantly natural polymers consisting of two major polysaccharides: linearly linked amylose and branched amylopectin, which have thermoplastic behavior but are present in granular form in their native state. The starch may be converted into a molten plastic state known as thermoplastic starch (TPS) when placed in a shear force at a temperature of 90 to 180 DEG C in the presence of a suitable plasticizer. In thermoplastic starches, the weaker hydrogen bond between the polysaccharide and the plasticizer replaces the original polysaccharide hydrogen bond, making the thermoplastic starch soft and ductile. Specifically, the new bond between the plasticizer and the polysaccharide greatly reduces the secondary bond that fixes the long-chain polysaccharide. In view of starch being a renewable resource, thermoplastic starch is a sustainable product.

However, this has two major disadvantages, high water solubility and weak mechanical strength, compared with conventional synthetic plastics. In order to improve the TPS mechanical properties and reduce its water absorption properties, TPS must be modified. Therefore, in the present invention, it is preferable to use polybutylene adipate-co-terephthalate (PBAT), poly (butylene succinate), polybutylene succinate adipate Blending with at least one polyester biodegradable resin selected from the group consisting of poly (butylene succinate-co-adipate; PBSA), polylactic acid (PLA) and polyhydroxyalkanoate (PHA) .

In the present invention, the thermoplastic starch (TPS) is preferably used in an amount of 20 to 50 parts by weight. When the amount of the thermoplastic starch (TPS) is more than the above range, the starch content is relatively increased, There is a disadvantage that the biodegradation rate is relatively slow.

In the above, sulfur is an oxygen group element belonging to group 6B of the periodic table, and sulfur, which has been known for a long time, has been used as a medicine or gunpowder in the ancient times by burning sulfur to sterilize the smoke. Sulfur is a yellow nonmetallic solid at room temperature and many isotopes are known. Sulfur is a natural ore that has been used as a medicine to regulate the poison in it. In this way, sulfur was immersed in ocher water mixed with ginger juice, boiled fifteen times, put in a radish, and boiled it nine times. This legal sulfur has been used as a remedy in folk remedies such as ovarian shortage, duodenal ulcer and inflammation, cystitis, poor circulation, constipation and headache. In addition, athlete's foot, om, swollen, and non-legal sulfur powder, such as pig oil or rosin, and burned or burned to smoke.

In addition, sulfur was sprayed to recover the soil of paddy fields contaminated with pesticides. In other words, once 4 to 5 times ginseng is planted in one place, the soil's intellect is reduced. In order to restore the ground's intelligence, Sulfur was sprayed with the same effect, and sulfur was used instead of various chemical fertilizers or pesticides to prevent pests and diseases, and a method of helping growth of vegetables, fruits, and grains was proposed.

Water-soluble sulfur is an essential ingredient for the growth of crops. It is a major component of many crops and produces three representative amino acids, cystine, cysteine and methionine, To increase the production quantity, and to increase the quality.

In addition, Illight is a mineralogical composition of feldspar (K2O, Na2O.Al2O3 6SiO2) and muscovite (1 / 2K2O.3Al2O3.6SiO2.2H2O), which contains a potassium element and its potassium element Since it is one of the nutrients together with nitrogen and oxygen, even if a trace amount thereof is dissolved in water, it has an effect of promoting the growth of the plant. Such ilite, when used in the present invention, improves intelligence, supplies rich oxygen, In addition, since ilite is formed at a relatively high temperature compared to other clay minerals and potassium ions are present between the layers, And it is believed that the utilization rate will be gradually expanded. The effect of far-infrared radiation, toxic gas adsorption, negative ion generation, etc. is great, Land provides an environment that can breathe and live the intellect gives the desolate soil to emit a large amount of far-infrared rays, allows to further enable high-quality land.

Calcium carbonate is a major component of calcareous fertilizer, and it plays a role in supplying calcium to plants and fruits with the effect of improving acid soil

Vermiculite is a hydrous mica, which is a product of alteration of phlogopite or biotite. It is the only minerals produced in the world. It is a unique mineral containing three kinds of moisture, to be. When it is heated by a sudden high heat, moisture between the layers of vermiculite is vaporized by steam and pressure is generated. As the pressure is released, the vermiculite is exfoliated and becomes expanded vermiculite. Expanded Vermiculite is very low in specific gravity and has excellent insulation and nonflammability, noise blocking effect, water absorption effect, physical shock absorbing effect, expansion material, filler material and also has cation exchange capacity / CEC), and it is widely regarded as a pollutant or organic sorbent. Especially, since the CEC of vermiculite is high, the nutrients in the soil are retained, and the soil fertility is kept as it is. It is used not only as a soil improvement agent but also as a soil material which maintains the moisture content in the soil and stores the nutrients when the artificial soil is produced because it makes the optimum environment for the growth of microorganisms by facilitating the growth of the microorganisms. It has very good conditions for propagation, so it absorbs microorganisms and nutrients, And the adsorbed microorganisms and nutrients are slowly eluted in accordance with the surrounding environment, so long-term effects can be expected.

In the present invention, the filler is preferably used in a weight ratio of 0.5: 0.5: 1: 0.5 by weight of sulfur powder, diatomite powder, calcium carbonate powder and expanded vermiculite powder. There is a drawback in terms of imbalance and cost-effectiveness.

In addition, the sludge of the lake, stream, or water purification plant is composed of organic and inorganic and natural fermentation microorganisms except for moisture, with a water content of 96 to 99.5%, though it varies depending on the area, season, It is preferable to use 5 to 10 parts by weight as dry powder of the lake, river or water purification plant sludge, and if it exceeds the above range, the mechanical properties of the mulching film The use of organic fertilizer becomes insufficient.

Meanwhile, the biodegradable agricultural mulching film of the present invention comprises 20 to 50 parts by weight of a thermoplastic starch (TPS); Butylene succinate-co-adipate (PBT), poly (butylene succinate), poly (butylene succinate-co-adipate 50 to 80 parts by weight of at least one biodegradable resin selected from the group consisting of PBSA, polylactic acid (PLA) and polyhydroxyalkanoate (PHA), and at least one biodegradable resin selected from the group consisting of sulfur powder, 5 to 15 parts by weight of a filler containing calcium powder and expanded vermiculite powder are mixed in a twin extruder at 160 to 200 ° C and then extruded into 0.2 to 0.5 mm.

At this time, the filler is preferably mixed at a weight ratio of 0.5: 0.5: 1: 0.5 in a weight ratio of sulfur powder, diatomite powder, calcium carbonate powder and expanded vermiculite powder, and 5 to 10 parts by weight of dry powder of a lake, ≪ / RTI >

[Production of mulching film of the present invention]

10 parts by weight of a filler mixed with 50 parts by weight of TPS, 10 parts by weight of PLA, 60 parts by weight of PBAT and sulfur powder, diatomite powder, calcium carbonate powder and expanded vermiculite powder in a weight ratio of 0.5: 0.5: 1: 0.5, , And then extruded into 0.3 mm square to prepare a mulching film.

[Comparative Example 1]

[ As a comparative example Mulching film  Produce]

A mulching film was prepared using the same method as in [Example 1] except that no filler was used in [Example 1].

[Measurement of physical properties of mulching film]

Using the mulching films prepared in [Example 1] and [Comparative Example 1], test pieces were produced using the No. 1 mold specified in 7.6 Tensile Strength and Elongation Test Method of Agricultural Polyethylene Film Standard KS M 3503: 2002, Load, tear strength and elongation were measured. The breaking load was measured according to KSD 3514, the elongation was measured according to ASTM D638, and the tear strength was measured according to ASTM D 1922. The results are shown in Table 1 below.

Cutting load (N) Tear strength (N / cm) Elongation (%) TD MD TD MD TD MD Example 1 3.80 7.55 2.75 2.90 573 266 Fertilizer example 1 2.45 4.76 2.22 2.46 685 570

As shown in Table 1, Example 1 of the present invention is excellent in terms of cutting load and tearing strength, but there is a slight difference in elongation percentage, but it is considered that soil improvement and fertilizer effect It is considered that the use of mulching film is not a big problem.

[Biodegradability test]

The mulching films prepared in [Example 1] and [Comparative Example 1] were coated on actual soil to measure biodegradability. For this purpose, biodegradability was measured by visually observing the decomposition progress of the coated sheet at the initial stage of coating, 90 days after coating, and 180 days after coating. As a result of the measurement, after 180 days, it was found that the mulching films of [Example 1] and [Comparative Example 1] were both breeding fungi and biodegrading.

[Measurement of Growth of Crops]

The mulching films prepared in [Example 1] and [Comparative Example 1] were coated on actual soil and biodegraded, and the degree of growth of the crops growing in the soil was measured. In the case of [Example 1] containing a filler, it was confirmed that the growth of the crop was faster than that of [Comparative Example 1] in which no filler was included.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

Claims (5)

20 to 50 parts by weight of a thermoplastic starch (TPS); Butylene succinate-co-adipate (PBT), poly (butylene succinate), poly (butylene succinate-co-adipate 50 to 80 parts by weight of at least one biodegradable resin selected from the group consisting of PBSA, polylactic acid (PLA), and polyhydroxyalkanoate (PHA), and at least one biodegradable resin selected from the group consisting of sulfur powder, 5 to 15 parts by weight of a filler comprising calcium powder and expanded vermiculite powder and 5 to 10 parts by weight of dried powder of a lake or a water treatment plant sludge,
Wherein the filler is a mixture of sulfur powder, diatomite powder, calcium carbonate powder, and expanded vermiculite powder in a weight ratio of 0.5: 0.5: 1: 0.5 by weight based on the total weight of the biodegradable resin composition for agricultural mulching film
delete delete A biodegradable agricultural mulching film using a resin composition for a biodegradable agricultural mulching film having a soil improving and fertilizer function according to claim 1 delete