KR100360122B1 - Polyethylene Mulching Film Having Insecticidal And Weeding Effect - Google Patents

Abstract

The present invention is a mixture of 80% by weight of polyethylene base resin and 20% by weight of a Ti-based inorganic material having an average whisker length of 20 μm or less and a diameter of 1 μm or less by mixing the base resin in a master batch prepared by secondary mixing of the entire polyethylene mulching film composition. 1 having a first layer resin film made of a composition in which Ti-based inorganic material is added to 10 wt% or less, and a second layer black film made by mixing a base resin in a carbon black master batch. A layer of polyethylene mulching film. When growing crops such as Chinese cabbage, cucumber and kidney beans, the first layer resin film of the polyethylene mulching film acts to reduce the influx of pests, and the second layer black film increases the light reflectance of the first layer resin film. It increases the effect and at the same time acts to suppress weed production. As the base resin used in the polyethylene mulching film composition of the present invention, polyethylene such as low density polyethylene (LDPE), high density polyethylene (HDPE), linear low density polyethylene (LLDPE) is preferable, and the inorganic filler has an average whisker length of 20 μm or less. It is preferable that a diameter is 1 micrometer or less, Ti type inorganic substance is contained in 10 weight% or less with respect to the whole resin composition. The insecticidal and herbicidal polyethylene mulching film composition of the present invention may be manufactured in a pellet state and used to manufacture a film or a molded article.

Description

Polyethylene Mulching Film Having Insecticidal And Weeding Effect

Field of invention

The present invention relates to a polyethylene mulching film containing Ti-based inorganic material and carbon black having insecticide and herbicidal function. More specifically, the present invention is prepared by mixing the Ti-based inorganic material in the whisker form with a polyethylene resin to prepare a master batch, and then the master batch prepared by mixing the polyethylene batch with a polyethylene resin and a carbon black master batch The present invention relates to an environmentally friendly polyethylene mulching film, which consists of two layers of a film, which can suppress the occurrence of pests and weeds during crop cultivation.

Background of the Invention

Currently in rural areas of Korea, mulch film is applied to the ground to maintain the temperature of the ground when cultivating crops such as pepper, cabbage, cucumber, and to prevent germination of water early to germinate crops. At this time, in general, the mulching operation after spraying herbicides and insecticides for herbicides and insecticides. The herbicides and pesticides to be sprayed are more economical than necessary, can adversely affect crop growth and can be harmful to the working person. In addition, the spraying and mulching operations of herbicides, etc. are separated, there is a hassle due to the double operation.

Therefore, a method of adding herbicides has been attempted from the mulching film manufacturing step. However, since the herbicide is a kind of organic additive different from the thermoplastic resin which is the main component of the mulching film, the herbicide has little compatibility with the resin, and also degrades the physical properties of the resin like other inorganic additives. Since herbicides are predominantly liquid or low melting point solids, they may decompose or volatilize or disperse evenly when the herbicide is added.

Japanese Patent Publication No. 46-42218 discloses a method for producing a pesticide-containing resin composition in which a pesticide is impregnated in a porous inorganic material first and then dispersed in a thermoplastic resin. However, this method does not have a big problem when the final form of the thermoplastic resin in the sheet state, but when produced with a thin film (10μ ~ 250μ) will cause a large decrease in the film properties. In addition, this method requires prescribing pesticides to the porous inorganics, which increases the thickness of the film and increases the cost, and causes inconveniences that farmers cannot easily handle.

Accordingly, the present inventors manufactured a mulching film composed of two layers of a first layer film in which a Ti-based inorganic material was added to a polyethylene resin in advance and a second layer film containing carbon black in a simple manner instead of herbicides, such as herbicides, etc. It minimizes consumption, maintains mulching effect (ground warming and moisturizing), and maintains the physical properties of the resin, while having an excellent herbicidal function and at the same time have a pest control function to suppress the introduction of harmful pests. In addition, the present invention was used by adding an additive of stearic acid (stearic acid) system in order to evenly disperse the Ti-based inorganic additives in the base resin.

An object of the present invention is to provide a polyethylene-based mulching film composition having a pesticidal function of inhibiting the introduction of harmful pests to the crops by using a resin film made of Ti-based inorganic additives instead of spraying the insecticide.

Another object of the present invention is to maximize the insecticidal effect of the Ti-based inorganic film is added, using a film containing carbon black so as to exhibit the herbicidal effect by the shading effect without the use of herbicides and insecticide function It is to provide a polyethylene-based mulching film composition having a.

Still another object of the present invention is to provide a polyethylene-based mulching film composition having a herbicidal function together with a insecticide function using a two-layer film containing a Ti-based inorganic additive and carbon black.

Still another object of the present invention is to provide a insecticidal and herbicidal polyethylene mulching film composition in which the physical properties of the mulching film are not significantly reduced even when the Ti-based inorganic additive and the carbon black master batch are added.

Still another object of the present invention is to provide a pesticide / herbicidal polyethylene mulching film composition which can reduce the use of pesticides harmful to a human body with a polyethylene mulching film prepared using a Ti-based inorganic additive and a carbon black master batch.

Still another object of the present invention is to provide an economical insecticidal and herbicidal polyethylene mulching film composition by compressing pesticide spraying and mulching operations in one step by using a polyethylene mulching film prepared using a Ti-based inorganic additive and a carbon black master batch. It is to.

Still another object of the present invention is to provide a pesticide / herbicide polyethylene mulching film composition which can increase the yield with a polyethylene mulching film prepared using a Ti-based inorganic additive and a carbon black master batch.

The above and other objects of the present invention can be achieved by the present invention described below.

The present invention is a mixture of 80% by weight of polyethylene base resin and 20% by weight of a Ti-based inorganic material having an average whisker length of 20 μm or less and a diameter of 1 μm or less by mixing the base resin in a master batch prepared by secondary mixing. A two-layered insect repellent and herbicidal function consisting of a first layer resin film containing 10 wt% or less of a Ti-based inorganic material to the mulching film composition, and a second layer black film prepared by mixing a base resin in a carbon black master batch. It relates to a polyethylene mulching film composition of.

When growing crops such as Chinese cabbage, cucumber, and kidney beans, the first layer resin film of the polyethylene mulching film acts to reduce the influx of pests, and the second layer black film increases the light reflectance of the first layer resin film to debug At the same time, the effect of suppressing the production of weeds is enhanced by the light shielding effect. Therefore, the mulching film composition which consists of a film of a single | mono layer can also be manufactured according to the required work effect.

As the base resin used in the polyethylene mulching film composition of the present invention, low density polyethylene (LDPE), high density polyethylene (HDPE), linear low density polyethylene (LLDPE) and the like are used. The Ti-based inorganic material may be used without particular limitation as long as the average whisker length is 20 μm or less and the diameter is 1 μm or less, and includes potassium octatitanate whisker (K ₂ O · 8TiO ₂ ). Ti-based inorganic material is preferably contained up to 10% by weight based on the total polyethylene mulching film composition. The polyethylene mulching film composition of the present invention may be manufactured in a pellet state and used to prepare a film or a molded article. Hereinafter, the content of the present invention will be described in detail.

The method for producing the insecticidal / herbicidal polyethylene mulching film of the present invention is as follows.

First, a master batch is prepared by mixing 20 wt% of the Ti-based inorganic additive with 80 wt% of the base resin. The primary resin prepared by mixing the primary resin in a secondary batch to prepare a polyethylene mulching film containing the final Ti-based inorganic additives. The amount of the Ti-based inorganic additive in the whole polyethylene mulching film composition can be controlled by controlling the amount of the base resin to be mixed secondly. At this time, in order to evenly disperse the Ti-based inorganic additives in the base resin may be added an additive of stearic acid (stearic acid) system. The base resin prepared using the stearic acid-based additive according to the present invention was observed by SEM (Scanning Electron Microscope: Scanning Electron Microscope), and it was confirmed that the Ti-based inorganic additive was uniformly dispersed in the base resin.

As the base resin, low density polyethylene (LDPE), high density polyethylene (HDPE), linear low density polyethylene (LLDPE), and the like are used. The base resin mixed first and the base resin mixed second may be the same or different. The Ti-based inorganic material preferably has an average whisker length of 20 µm or less and a diameter of 1 µm or less.

Meanwhile, a black film is prepared by mixing an appropriate amount of polyethylene base resin in a carbon black master batch. The content of the carbon black and the resin and the production of the black film can be easily carried out by those skilled in the art to which the present invention pertains. The film containing the black film and the Ti-based inorganic additive is manufactured as a two-layer mulching film by using a two-layer brown film extruder. The resulting two-layer film is a silver film layer in which the first layer contains a Ti-based inorganic additive, and a black film layer in which the second layer contains carbon black is formed. The thickness of the finally produced multi-layer mulching film is about 40㎛, even if thinner or thicker than this, the physical properties of the mulching film, insect repellent, herbicidal effect does not change significantly. Here, the silver film layer, which is the first layer, functions to reduce the influx of pests such as aphids, and the black film layer, which is the second layer, increases the light reflectance of the resin film of the first layer to increase the insecticidal effect and simultaneously produce weeds by the shading effect. Since it performs a function of suppression may be produced as a single-layer mulching film as needed. In addition, in order to have a detoxification effect, the value of UV light reflectance R _A / R _B of the silver film as the first layer should be 1.4 or more. Where R _A is the light reflectance at wavelength 400nm or less and R _B is the light reflectance at wavelength 500nm.

The polyethylene mulching film composition of the present invention may be prepared in a pellet state and used as a raw material when manufacturing a film or injecting a molded article.

In general, when the inorganic additive is contained in the synthetic resin composition, physical properties such as strength, strain, elastic modulus, toughness, Izod impact strength, and tear strength decrease. The greater the content of the inorganic additive, the lower the physical properties. Therefore, the content of inorganic additives that minimizes the degradation of physical properties and maximizes the effect is important.

The physical properties of the film sample for preparing the film with the polyethylene mulching film composition of the present invention is generally significantly reduced when the content of the Ti-based inorganic material exceeds 10% by weight. Therefore, the resin composition of the present invention for producing a mulching film preferably contains 10 wt% or less of Ti-based inorganic material or carbon black, and preferably has a content in the range of 3 to 5 wt%.

The present invention will be further illustrated by the following examples, which are only specific examples of the present invention and are not intended to limit or limit the protection scope of the present invention.

Example

Specifications of the base resin and the Ti-based inorganic material used in Examples 1-3 below are as follows.

(A) Basic resin

Low density polyethylene (product name: Hanyang Chemical 5321) manufactured by Hanyang Chemical was used.

(B) Ti-based inorganic

Potassium octatitanate whisker (K ₂ O · 8TiO ₂ , product name: Tismo-D) manufactured by Otsuka Chemical Co., Ltd., Japan, was used.

Example 1-3 Preparation of Specimen

Example 1 Bulk Sample Preparation of Polyethylene / Ti-Based Inorganic Materials

Low density polyethylene (LDPE) and Ti-based inorganic materials, which are basic resins, were mixed at a ratio of 80% by weight and 20% by weight, respectively, to prepare a primary polyethylene / Ti-based inorganic master batch of pellet type.

A low density polyethylene (LDPE) was mixed in a secondary batch of the primary polyethylene / Ti-based inorganic material (80% by weight of LDPE / 20% by weight of Ti-based inorganic material) to prepare a Ti-based inorganic material-containing resin composition. By adjusting the content of the low-density polyethylene to be mixed secondly, a bulk sample having a Ti-based inorganic content of 3, 5, 7, and 10 wt%, respectively, was prepared, and the bulk specimen containing no Ti-based inorganic material was prepared. Prepared under the same conditions as. The physical property measurement results of the bulk specimens are shown in Table 1, and the impact strength and tensile strength were measured by ASTM D-256 and ASTM D-638.

Ti-based inorganic content (wt%) Maximum strength (N / mm2) Elongation at Break (%) Tensile Strength (N × mm) Notched Izod Impact Strength (kgcm / cm) 0 4.8 49.0 483.3 375.0 3 5.1 60.9 546.2 460.8 5 5.2 60.5 535.9 386.5 7 3.4 41.8 297.9 338.9 10 2.8 44.1 289.2 324.8

As shown in Table 1, it can be observed that physical properties such as maximum strength, elongation at break, elongation strength, and impact strength are generally improved until the content of Ti-based inorganic material is 5% by weight. In the above content it could be confirmed that the physical properties are gradually reduced.

Example 2 Preparation of a Single Layer Film Sample of Polyethylene / Ti-Based Inorganic Materials

Table 2 shows the results of preparing a film using a polyethylene / Ti-based inorganic composition having a content of Ti-based inorganic material at 0, 3, 5, 7, 10 wt%. Impact strength and tensile strength were measured in the machine direction (M.D.) and transverse direction (T.D.), respectively, and tensile strength and tear strength were measured by ASTM D-882, ASTM D-1922.

Ti-based inorganic content (wt%) Strength (MPa) Elongation at Break (%) Tensile Strength (N × mm) Tear strength (gf) M.D. T.D. M.D. T.D. M.D. T.D. M.D. T.D. 0 22.3 12.5 96.1 376.0 60.4 90.9 536.0 80.0 3 24.4 16.9 140.9 454.4 90.2 68.2 835.0 225.0 5 24.0 14.3 120.1 300.4 58.8 71.3 512.5 187.5 7 16.3 12.5 89.2 243.1 63.1 72.7 158.3 112.5 10 14.3 13.9 96.4 242.8 65.6 105.8 50.0 59.0

As shown in Table 2, even in the case of a single layer film, the physical properties were improved until the content of the Ti-based inorganic material was 5% by weight, but was lowered at 7% by weight or more, and the result was measured in the mechanical properties of the specimen prepared in Example 1. Similar to the results.

Example 3 Preparation of Two-Layer Film Using Polyethylene / Ti-Based Inorganic Materials and Carbon Black Masterbatch

A film of the first layer was prepared from a polyethylene / Ti-based inorganic composition having a content of Ti-based inorganic material of 3 and 5% by weight, respectively, and another film of another layer was prepared from a carbon black master batch. It was prepared as a two-layer film using a film extruder and the UV light reflectance of the film was measured by a UV-visible spectrophotometer (UV-visible spectrophotometer) and the results are shown in Table 3. Table 3 shows the chemical formulas manufactured by Ilshin Chemical Co., Ltd. KO deterrence and herbicidal mulching film (KO), the chemical formula produced by Ilshin Chemical Co., Ltd., HDPE (transparent) mulching film (TF), and manufactured by Ilshin Chemical Co., Ltd. HDPE (black) mulching film (BF), Miranesque insect repellent, herbicide mulching film (MI) manufactured by Sumitomo (Japan), two-layer insect repellent, herbicide mulching film according to the present invention (Ti-based inorganic content 3% by weight: C3), the existing two-layer insect repellent, herbicidal mulching film (Ti-based inorganic content 5% by weight: C5), the two-layer insect repellent, herbicide mulching film (film using a milky white master batch: White) according to the present invention The ratio of UV light reflectance of the specimens according to the present invention, such as domestic (Ilshin Chemical) and Japanese (Miranesque) insecticide, herbicide mulching film and general mulching film, is shown. In addition, the tensile strength and tear strength in the machine direction (M.D.) and the transverse direction (T.D.) were measured by ASTM D-882 and ASTM D-1922, and the results are shown in Table 4.

Psalter R _A ^* (%) R _B ^* (%) R _A / R _B KO 25.0 23.8 1.04 TF 9.0 8.6 1.04 BF 5.1 5.0 1.02 MI 62.1 53.7 1.15 C3 14.0 8.5 1.65 C5 18.8 11.9 1.58 White 47.0 39.3 1.20

R _A ^* : peak light reflectance at wavelength of 400 nm or less

R _B ^* : light reflectance at wavelength 500 nm

As shown in Table 3, the R _A / R _B values of the domestic KO and Japanese MI films were 1.04 and 1.15, respectively, significantly below the reference value of 1.4, but the C3 and C5 films exceeded the reference values of 1.65 and 1.58.

Psalter Strength (MPa) Elongation at Break (%) Tensile Strength (N × mm) Tear strength (gf) M.D. T.D. M.D. T.D. M.D. T.D. M.D. T.D. C3 24.6 15.0 131.3 639.6 82.7 141.0 16.0 730.0 C5 25.1 18.7 139.8 739.5 88.2 219.0 18.7 750.0 White 25.7 18.7 110.6 741.9 69.6 211.8 14.5 916.0

Example 4-6: Determination of insecticidal and herbicidal effects of mulching film during crop cultivation

Example 4: Determination of the insecticidal and herbicidal effect during the Chinese cabbage cultivation of the two-layer insecticidal and herbicidal mulching film

Experimental packaging of cabbage and kidney beans in the fall and pepper (gold-top pepper) and cabbage (high-cold paper) in the spring and summer periods, using the film prepared according to the method for preparing the insecticide and herbicidal mulching film prototype prepared according to the present invention in Example 3. Summer cabbage), and the test packaging of kidney beans (kidney beans No. 1) was carried out. First, we evaluated the insecticide and herbicidal effects of Chinese cabbage and Gangnam soybean packaging on 7 kinds of varieties such as C3, C5, White, KO, and MI in the fall. The results are shown in Table 5. As shown in Table 5 below, the pest density (occurrence) per yellow sticky trap was about 2 and 12.3 for C3 and C5 films for aphids, 8.7 for White film and 9.0 for MI film, respectively. , 12.7 for KO films, 40 for BF films, and 65.7 for uncovered aphids. Therefore, it was confirmed that the prototype C3 film had the best pest repelling effect. In the case of TuMV disease rate, which is a viral disease in Chinese cabbage, the low rate of disease rate was less than 3% in all three prototypes and KO and MI films, while the incidence rate was 8.5% in BF film and 82.2% in uncoated case. . In addition, the weed generation amount was 5 weeds including the prototype, but the weed generation rate was 26.7 for BF film and 646.7 g / m ^{2 for} uncovered. Therefore, when viewing the results of this performance experiment, it was confirmed that the C3 and C5 films prepared by the method of Example 3 generally had very excellent insecticidal and herbicidal effects as compared with other conventional competitive films and general films.

Aphid density per yellow sticky trap TuMV Lee Byung-joo rate (%) Weed generation (live g / m ² ) C3 2.0 1.9 0 C5 12.3 2.6 0 White 8.7 1.9 0 MI 9.0 2.9 0 KO 12.7 3.0 0 BF 40.0 8.5 26.7 Uncoated 65.7 82.2 646.7

On the other hand, the size and weight of Chinese cabbage were examined during the early stages of harvesting and harvesting to investigate the effects of insecticidal and herbicidal mulching films on the growth of Chinese cabbage. As shown in Table 6, C5 film had the best leaf length at the early stage of growth and leaf width was also excellent. The white and KO films were excellent in conifers, but the rest of the prototypes were similar, and much better than uncoated. In addition, C3 film was the best at 3.7kg, and the quantity of commodity was 7,644kg / 10a (300 pyeong), which was about 27% higher than uncovered. . Thus, combining these results, it was confirmed that the C3 film had a generally low pest density, excellent crop size and yield.

Early Growth (After 15 Days) Harvest time (70 days after regular meal) Leaf length (cm) Leaf width (cm) Leaves () Weight (kg) Quantity of goods (kg / 10a) C3 24.2 17.2 11.7 3.7 7,644 (127) C5 24.4 16.8 11.8 3.4 7,327 (122) White 24.1 16.4 12.2 3.3 7,112 (119) MI 24.1 16.3 11.8 3.5 7,543 (126) KO 24.2 17.0 11.9 3.3 6,818 (114) BF 20.7 14.5 10.8 3.3 6,597 (110) Uncoated 16.4 11.8 9.6 2.7 5,999 (100)

Example 5: Determination of the insecticidal and herbicidal effect of cultivation of kidney beans of the two-layer insecticidal and herbicidal polyethylene mulching film prepared in Example 3

On the other hand, in the case of the test packaging of the two-layer insect repellent, herbicidal polyethylene mulching film using kidney beans, the pest density measurement results per yellow adhesive trap were as shown in Table 7 below. The aphid capture by yellow sticky traps in kidney beans was smaller in C3, C5, White, MI, and BF films than in KO film and uncoated.

Pest Wheat Road aphid Whisker C3 6.0 121.3 C5 9.3 74.7 White 6.3 125.0 MI 9.7 118.7 KO 33.7 114.3 BF 11.0 81.0 Uncoated 21.3 82.0

Example 6: Determination of the insecticidal and herbicidal effects of pepper, cabbage and kidney beans of the two-layer insecticidal and herbicidal polyethylene mulching film prepared in Example 3

On the other hand, in the spring and summer, using the film was carried out the test packaging of red pepper (gold top pepper), Chinese cabbage (high-cold summer cabbage), kidney beans (Gang bean 1). The pests examined were aphids and larvae, and six films were used for comparison, including C3, C5, White, and MI. The items examined were aphid and nymph density, crop growth and weed development, and geothermal changes. Growth and aphid generation density test results according to the pepper packaging test of the two-layer insect repellent, herb mulching film and comparative products are shown in Table 8. As shown in Table 8, the C3 and C5 films were 68.8 and 71.6 cm in length, respectively, and their diameters were 11.2 and 11.4 mm, which were much better than those of White, MI, and BF film and uncoated film. On the other hand, C3 and C5 films showed only 9.8 and 9.0 birds per leaf, whereas White and MI films showed high aphid density of 29.3 and 28.6 birds per leaf. Particularly uncovered, a very high aphid density of 49.2 birds / leaf.

Treatment Name Pepper growth (after 50 days of meal) Aphid outbreak density (marijuana / leaf) (June 21 survey) Extra long (cm) Diameter (mm) C3 68.8 11.2 9.8 C5 71.6 11.4 9.0 White 59.0 9.6 29.3 MI 60.4 9.9 28.6 BF 67.0 10.6 20.4 Uncoated 51.7 8.3 49.2

Pest density and weed yield per yellow sticky trap in Chinese cabbage test packages are shown in Table 9 below. For aphids, C3 and C5 films showed 28.0 and 20.7, while White and MI showed higher values, 36.0 and 39.3. In particular, the uncoated film was 57.3, showing a number of aphids two times higher than the C3 and C5 films according to the present invention. It was also confirmed that the larvae and Chinese cabbage moths had much lower pest densities than other mulching films. On the other hand, the weed generation amount was not weed except for white film and uncoated.

Treatment Name Pest density per yellow sticky trap Weed generation (live weight g / ㎡) aphid Whisker Chinese cabbage moth C3 28.0 65.7 7.3 0 C5 20.7 61.0 9.7 0 White 36.0 107.0 10.3 0 MI 39.3 89.3 12.7 0 BF 27.0 95.7 8.3 38.4 Uncoated 57.3 120.3 13.0 209.6

In addition, as shown in Table 10, the results of the Chinese cabbage test packaging showed that the C3 and C5 films had better composition and width than other films, and the weight was 1.9 and 2.1 kg, respectively. Finally, the yield of C3 and C5 film was 3,999 and 4,421kg, which was the best yield.

Treatment Name Gugo (cm) Ball width (cm) Weight (cm) Quantity of goods (kg / 10a) C3 25.0 15.6 1.9 3,999 C5 27.7 15.6 2.1 4,421 White 26.0 15.6 1.7 3,579 MI 26.2 15.9 1.9 3,925 BF 24.2 13.6 1.6 3,022 Uncoated 22.7 13.7 1.1 2,200

On the other hand, as shown in Table 11, the results of test packaging using kidney beans showed that the aphid incidence density was 0.8, 0.7 for C3 and C5 films, which was equivalent to that of other competitors, and was superior to BF films and uncoated coatings. .

Treatment Name Aphid Occurrence Density (Marine / leaf) C3 0.8 C5 0.7 White 0.7 MI 0.9 BF 1.8 Uncoated 8.1

Taken together, the results of the insecticide and herbicide test packaging for various crops, such as C3, C5 film, the two-layer mulching film produced according to the present invention as well as excellent overall insecticide and herbicidal effect compared to known products It was confirmed that the yield can be obtained.

The present invention consists of a first layer base resin film using a whisker-type Ti-based inorganic additives and a second layer black film manufactured by using a carbon black master batch, thereby reducing pest damage during crop cultivation and thus reducing pesticide use. An object of the present invention is to provide an environmentally friendly insecticidal and herbicidal mulching film composition which can enhance the effect and the final yield.

Simple modifications and variations of the present invention can be readily used by those skilled in the art, and all such variations or modifications can be considered to be included within the scope of the present invention.

Claims (5)

80% by weight of the polyethylene base resin and 20 wt% of the average whisker length of 20 μm or less and the Ti-based inorganic material having a diameter of 1 μm or less were mixed with the base resin in a master batch prepared by secondary mixing. A first layer resin film prepared from a composition containing 10 wt% or less of an inorganic substance; And A second layer black film prepared from a carbon black master batch and a mixture of the base resins; Polyethylene mulching film of two layers having a function of insect repellent and herbicidal. The method of claim 1, wherein the base resin is selected from the group consisting of low density polyethylene (LDPE), high density polyethylene (HDPE), and linear low density polyethylene (LLDPE), each base resin may be the same or different. Two-layer polyethylene mulching film having a detoxification and herbicidal function. The method of claim 1, wherein the ratio of the first UV light reflectivity (R _A) of the inorganic substance-containing film layer Ti-based of the first layer is less than 400 nm wavelength for UV light reflectance at a wavelength of _{500 nm (R B) R A} / R Two-layer polyethylene mulching film having a detoxification and herbicidal function, characterized in that _B is 1.4 or more. The two-layer polyethylene mulching film of claim 1, wherein the Ti-based inorganic material is 3 to 5% by weight. An injection molded article prepared from the polyethylene mulching film composition according to any one of claims 1 to 4.