KR102326756B1 - Biodegradable mulching film using livestock dung and it's manufacturing method - Google Patents

Abstract

The present invention relates to a biodegradable mulching film using livestock dung, which controls a biodegradation rate thereof according to a growth period of crops and a manufacturing method thereof. According to the present invention, the biodegradable mulching film comprises: 30 to 40 parts by weight of thermoplastic starch; 30 to 40 parts by weight of a biodegradable polymer resin; 10 to 20 parts by weight of livestock dung; 19 to 20 parts by weight of polylactic acid; 0.5 to 5 parts by weight of potassium hydroxide; and 0.5 to 1.0 parts by weight of magnesium stearate. The manufacturing method comprises a first manufacturing step (S100) of manufacturing a pellet and a second manufacturing step (S200) of producing a mulching film by pressing and forming the pellets at a temperature of 120 to 185℃.

Description

Biodegradable mulching film using livestock dung and it's manufacturing method

The present invention relates to a biodegradable mulching film using livestock manure and a method for manufacturing the same, and more specifically, it is possible to control the biodegradation rate according to the growing period of crops, and during the biodegradation step, the components of livestock manure are decomposed into the soil while the soil It relates to a biodegradable mulching film using livestock that helps to improve fertility and activates the growth of crops, and a method for manufacturing the same.

In general, mulching is an operation that helps plants grow by covering or protecting the soil using a specific material.

Therefore, the effect of mulching is to maintain the moisture of the soil, suppress evaporation on the ground surface, and prevent the loss of moisture by suppressing the generation of weeds that require very high soil moisture.

In addition, it relieves the impact from raindrops or irrigation, and slows the movement speed of water to prevent soil erosion and water loss so that water can sufficiently penetrate into the soil.

When the mulching film or material is biodegraded, the content of organic matter increases, thereby improving the fertility of the soil.

In addition, in the case of soil subjected to mulching, the availability of nutrients can be increased by creating a good condition for the growth of microorganisms, but there is a problem in that the germination of weed seeds is suppressed and normal growth is difficult due to the lack of light intensity.

On the other hand, when mulching is performed on the ground surface, the properties are changed to organic compounding due to corrosion, so as the supply increases, the air permeability becomes good, and the soil temperature and humidity increase, which is good for root growth.

Therefore, it is possible to reduce the hardening of the soil that may occur during irrigation or passage, and also maintain good air permeability.

In addition, mulching suppresses evaporation of the surface of the ground and maintains moisture in an appropriate state, so it can dilute the concentration of salt. mulching in the winter is essential.

Therefore, mulching is expected to have the effect of suppressing the occurrence of pests and diseases and reducing the reflection and radiation of solar heat.

On the other hand, materials used for mulching are various, such as vinyl, paper, non-woven fabric, rice straw, fallen leaves, bark, rice husk, etc. In general, vinyl, which is low and easy to use, is widely used.

In contrast, Patent Document 1 uses a film made from linear low-density polyethylene (LLDPE) as a raw material as an invention related to a mulching film.

However, as the agricultural population engaged in agriculture is aging, a lot of labor and time are spent on recovering the mulching film after using it. Research on eco-friendly biodegradable mulching film is active in order to prevent the problem of increasing social costs due to insufficient processing facilities and increased accumulation.

Patent Document 1 discloses a biodegradable mulching film that manufactures a biodegradable mulching film using a slow-release fertilizer, and controls the type and growth period of crops by controlling the release time of the components of the slow-release fertilizer.

However, the mulching film is a biodegradable polymer PBEAST (Poly butylene ethylene adipate succinate-co-terephthalate) is also a very expensive material as the expensive slow-releasing (available), It can be very burdensome to use in

Existing biodegradable mulching films have different degrees of biodegradation depending on regional climate variations, soil conditions, crop types, climate change, and differences in precipitation in Korea. There is a problem that cannot be done.

Therefore, there is a need for a biodegradable mulching film suitable for the climate and soil environment for each crop, region, and period.

US 10-2021-0020659 A

Accordingly, the present invention has been made to solve the above problems, and an object of the present invention is to provide a biodegradable mulching film using livestock and a method for manufacturing the same, as follows.

First, it is possible to control the rate of biodegradation depending on the crop, and during biodegradation, livestock components are decomposed and permeated into the soil to provide a function to activate the growth of crops.

Second, it is to reduce the cost of producing the mulching film and not to collect the mulching film after using the mulching film as a result of decomposition of livestock farms by using livestock manure.

Third, it is to easily manufacture a biodegradable mulching film.

The present invention is not limited to the above objects, but can be realized by means and combinations thereof described in the claims.

In order to achieve the above object, the present invention provides the following means.

A biodegradable mulching film comprising: 30 to 40 parts by weight of thermoplastic starch; 30 to 40 parts by weight of a biodegradable polymer resin; 10 to 20 parts by weight of livestock; 19 to 20 parts by weight of polylactic acid; 0.5 to 5 parts by weight of potassium hydroxide; Contains 0.5 to 1.0 parts by weight of magnesium stearate, and the biodegradable mulching film provides a biodegradable mulching film using livestock, characterized in that it is formed to a thickness of 13 to 60 μm.

Here, the thermoplastic starch is characterized in that it consists of one or more kinds of starch produced from sweet potatoes, potatoes, corn, arrowroot, cassava, tapioca, and wheat.

And, the biodegradable polymer resin is a thermoplastic polyester polylactic acid, polybutylene adipate-co-terephthalate, polybutyleneethylene adipate succinate-co-terephthalate, polybutylene succinate terephthalate and polybutyl It is characterized in that it consists of at least one member from the group consisting of ren ethylene adipate terephthalate.

In addition, 70% by weight of livestock manure based on 100% by weight of the livestock manure; 10 to 20% by weight of sawdust; 5 to 10% by weight of the microbial medium; It is characterized in that 5 to 10% by weight of the microbial agent is mixed.

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On the other hand, in the manufacturing method of the biodegradable mulching film using the livestock of the above configuration, the first manufacturing step of preparing a pellet for molding a biodegradable mulching film containing the livestock; A second manufacturing step of manufacturing a mulching film by rolling and molding the pellets at a temperature of 120 to 185° C., wherein the first manufacturing step is a mixing process of making a mixture by mixing livestock manure, sawdust, a microbial medium and a microbial agent And: a fermentation process of producing a fermented product by stirring the mixture; an aging process of aging the fermented product to produce an aged product; a drying step of drying the aged product to produce a dried product; a pulverizing step of pulverizing the dried material to obtain a powder mixture; The powder of the mixture is mixed with a biodegradable resin, potassium hydroxide and magnesium stearate, and then extruded and cut to form a pellet into a pellet. It provides a method for producing a biodegradable mulching film using livestock flour .

By providing the present invention configured as described above, the following effects can be expected.

First, in the biodegradation process, livestock has the effect of accelerating the biodegradation rate, thereby enabling the shortening of the biodegradation period.

Second, the mechanical properties are excellent, compatibility with the soil is increased, it is helpful in solving the livestock manure problem, and there is an effect of reducing the social cost due to the recovery and treatment of the mulching film.

Third, there is an effect of improving the poor agricultural environment and increasing productivity due to the aging of the rural workforce, the avoidance of agriculture, and the decrease of the employed farming population.

Fourth, it can prevent the devastation of farmland, and it has the advantage of securing the economic feasibility of rural areas through resolving the labor shortage caused by the aging of the rural population and reducing labor costs. This has the effect of preventing the phenomenon.

1 is a flow chart showing a method for manufacturing a biodegradable mulching film using livestock according to the present invention.

In describing the embodiments of the present invention, if it is determined that the detailed description of the known technology related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted. In addition, the terms described below are terms defined in consideration of functions in the present invention, which may vary according to intentions or customs of users and operators. Therefore, the definition should be made based on the content throughout this specification. The terminology used in the detailed description is for the purpose of describing embodiments of the present invention only, and should in no way be construed as limiting. Unless explicitly used otherwise, expressions in the singular include the meaning of the plural. In this description, expressions such as “comprising” or “comprising” are intended to indicate certain features, numbers, steps, acts, elements, some or a combination thereof, one or more other than those described. It should not be construed as excluding the presence or possibility of other features, numbers, steps, acts, elements, or any part or combination thereof.

In each system shown in the figures, elements in some instances may each have the same reference number or a different reference number to suggest that the represented element may be different or similar. However, elements may have different implementations and work with some or all of the systems shown or described herein. The various elements shown in the drawings may be the same or different. Which one is referred to as the first element and which is referred to as the second element is arbitrary.

In this specification, when any one component 'transmits', 'transfers' or 'provides' data or signal to another component, one component directly transmits data or signal to another component, as well as, and transmitting data or signals to the other component via at least one further component.

Before describing an embodiment of the present invention, a biodegradable mulching film using livestock powder applied to the present invention and a manufacturing method thereof will be described.

First, with respect to the drawings proposed in the present invention, Figure 1 is a flow chart showing a method for manufacturing a biodegradable mulching film using livestock according to the present invention.

The biodegradable mulching film using the livestock of the present invention is 30 to 40 parts by weight of thermoplasticity starch (TPS), 30 to 40 parts by weight of biodegradable polymer resin (PBAT; Polybutylene adipate-co-terephthalate), 10 to 20 parts by weight of livestock. Parts by weight, poly lactic acid (PLA) 19 to 20 parts by weight, potassium hydroxide (KOH; Potassium Hydroxide) 0.5 to 5 parts by weight, magnesium stearate (Magnesium stearate) 0.5 to 1.0 parts by weight.

A first manufacturing step (S100) of preparing a pellet for molding a biodegradable mulching film containing livestock; It may include a second manufacturing step (S200) of producing a mulching film by rolling the pellets at a temperature of 120 ~ 185 ℃.

In the case of the first manufacturing step (S100), the thermoplastic starch is at least one of starch produced from sweet potato, corn, potato, arrowroot, cassava, tapioca, and wheat, and one or more of the starches may be mixed.

In detail, starch produced from potatoes may be obtained through a thermoplastic reaction, and the thermoplastic starch may further include vegetable stems, roots, and leaves.

The starch obtained by the thermoplasticization reaction is soft or hard like olefin plastic, and its properties can be easily controlled, and it can be commercialized and recycled again after use.

That is, when the thermoplastic starch applied to the present invention is mixed in a ratio of 30 parts by weight or less, cracks occur on the surface of the mulching film during extrusion, the rupture occurs in the folded part of the film, and a ratio of 40 parts by weight or more When mixed together, there may be difficulties in the molding process in the film forming stage during extrusion.

Next, a biodegradable polymer resin (PBAT; polybutylene adipate-co-terephthalate) is a petroleum-based biodegradable material, and has characteristics of improving flexibility and tensile strength.

When biodegradable polymer resin (PBAT) is mixed in a ratio of 30 parts by weight or less, the tensile strength during extrusion is insufficient. It is damaged, and if it is mixed in more than 40 parts by weight, there may be difficulties in which it is impossible to blow the film upward due to the melting phenomenon in the ejection dies (extrude dies) during the extrusion operation.

Livestock manure applied to the present invention can be used as a biodegradable active supplement and compost that has been fermented and aged by mixing livestock manure such as cow manure, pig manure, chicken manure, sawdust, and microorganisms, and is a valuable organic material that resolves livestock manure.

The use of a mulching film prepared by mixing 20 parts by weight of livestock with biodegradable resin has the advantage of accelerating the rate of biodegradation during the biodegradation stage of thermoplastic starch and bio-polyester (PBAT, PLA).

In addition, there is an advantage as a compost in which the components of livestock manure are absorbed into the soil in a sustained release type to control the growth period of crops.

The livestock powder applied to the present invention does not have any odor, so there is no inconvenience in use, and the particles of the livestock meal are processed to a size of 5 to 8㎛.

Based on 100% of the total weight of livestock manure, 70% by weight of livestock manure, 10 to 20% by weight of sawdust, 5 to 10% by weight of microbial medium, 5 to 10% by weight of microbial agent to produce a mixture by mixing process (S110) can
At this time, the microbial preparation is to use a 1:1 mixture of Bacillus natto and lactic acid bacteria.
Livestock manure preferably contains 49% by weight of cow manure, 14% by weight of chicken manure, and 7% by weight of pig manure.

In the state where the moisture content of the mixture is 50 parts by weight, air is injected and stirred into the mixture, and the fermentation product is produced through a fermentation process (S120) for 2 months. The aged product is manufactured through the process (S130), the moisture content of the aged product is 35 parts by weight, and the dried product is dried by drying the dried product (S140) to produce a dried product, the moisture content of the dried product is 5 parts by weight, and the dried product is 80 mesh. Through the grinding process (S150) of pulverizing can be manufactured livestock powder.

Potassium hydroxide added in addition to the mixture _{is dissociated into water (H 2} O) or ammonia (ammonia).

Potassium hydroxide plays a role in controlling the progress of biodegradation and the gradual release of livestock by being dispersed in the film.

That is, potassium hydroxide serving as a sustained-release function provides 0.5 to 5 parts by weight, preferably 0.5 to 2.5 parts by weight, and most preferably 0.5 parts by weight.

If potassium hydroxide is less than 0.5 parts by weight, the biodegradation rate is too delayed compared to the growth period of the crop. There is a limit in activating the growth of crops because they are decomposed before the sprouts of crops appear.

Acid value is one of the criteria for judging the quality of fats and oils. It refers to the number of mg of potassium hydroxide (KOH: Potassium Hydroxide) required to neutralize free fatty acids contained in 1 g of fat and oil. Lauric acid is considered as palmitic acid in palm oil.

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In the second manufacturing step (S200) of manufacturing the biodegradable mulching film using the livestock powder proposed in the present invention, the thickness of the film is 13 to 60 μm, preferably 15 to 40 μm, and most preferably 18 ~ 20㎛ is applied.

If the thickness of the mulching film is less than 13㎛, the biodegradation rate is too fast, so there may be a problem that it is biodegraded before the crop is harvested and weeds grow luxuriantly.

In addition, if the thickness of the film exceeds 60㎛, the biodegradation rate is too slow, there is a problem that must be disposed of after crop harvesting.

On the other hand, the manufacturing method of the biodegradable mulching film using the livestock of the present invention through the second manufacturing step (S200) of manufacturing the pellets through the first manufacturing step (S100) by rolling molding at a temperature of 120 ~ 185 ℃ A mulching film can be prepared.

Examples and Comparative Examples

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< Pellets of livestock >

[Table 1]

<Method of manufacturing livestock meal>

A mixing process (S110) of mixing livestock manure, sawdust, a microbial medium and a microbial agent to create a mixture; A fermentation process (S120) of making a fermented product by stirring the mixture; Aging process (S130) of aging the fermented product to make the aged product; A drying step (S140) of drying the aged product to make a dried product; It includes a grinding process (S150) of pulverizing the dried material to make a powder of livestock.

As shown in Figure 1, the contents listed below may include the step of preparing pellets by extruding and cutting the biodegradable resin, potassium hydroxide, magnesium stearate, and the like to the livestock powder of the present invention.

That is, the mulching film is formed by sequentially performing the mixing process (S110), the fermentation process (S120), the aging process (S130), the drying process (S140), the grinding process (S150), and the extrusion process (S160), including livestock manure. Pellets for manufacturing can be prepared.

The mixing process (S110) can produce a mixture by mixing 70% by weight of livestock manure, 10 to 20% by weight of sawdust, 5 to 10% by weight of microbial medium and 5 to 10% by weight of microbial agent based on 100% by weight of livestock manure. .

In the fermentation process (S120), the mixture may be stirred at 20 to 30° C. for 3 to 4 hours to produce a fermented product.

In the aging process (S130), the fermented product may be aged at 20 to 25° C. for 10 to 15 days to generate the aged product.

In the drying step (S140), the aged product may be dried at 30 to 35° C. for 22 to 24 hours to produce a dried product.

In the grinding process (S150), the dry matter may be pulverized to 8 to 10 mesh to produce livestock powder.

Extrusion step (S160) is 10 to 20 parts by weight of the powder consisting of after the pulverization step (S150); 30-40 parts by weight of thermoplastic starch; 30 to 40 parts by weight of a biodegradable polymer resin; 19 to 20 parts by weight of polylactic acid; 0.5 to 5 parts by weight of potassium hydroxide; 0.5 to 1.0 parts by weight of magnesium stearate may be mixed at 160 to 190° C. for 15 to 30 minutes, and then extruded and cut to prepare pellets.

[Table 2]

<Production of biodegradable mulching film >

10 to 20 parts by weight of livestock powder made into pellets through the extrusion process (S160); 30-40 parts by weight of thermoplastic starch; 30 to 40 parts by weight of a biodegradable polymer resin; 19 to 20 parts by weight of polylactic acid; 0.5 to 5 parts by weight of potassium hydroxide; A mulching film can be prepared through a film forming machine (50 mm HD/PF FILM M/C) including 0.5 to 1.0 parts by weight of magnesium stearate.
In this case, a specific color may be realized by further mixing 3 parts by weight of carbon black as a pigment to 100 parts by weight of the pellet.

And, the barrel temperature of the film forming machine is 160 ° C, the die temperature is 180 ° C, the rolling continuity is 500 rpm, the raw material input speed is 100 rpm, and the roll speed is 200 rpm. A mulching film can be prepared.

Examples and Comparative Examples 1 to 3 suggest the amount of material input for the manufacture of a biodegradable mulching film using livestock.

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In the case of an embodiment, by providing each component proposed by the present invention within an appropriate range, biodegradation can be accelerated according to the growing period of crops, and impact and tension on the mulching film can be appropriately responded.

On the other hand, in Comparative Example 1, thermoplastic starch was mixed in an amount of 30 parts by weight or less, and cracks were generated on the surface in the process of manufacturing the mulching film through rolling. In Comparative Example 2, the biodegradable polymer resin was 30 Even if the mulching film is completed due to insufficient tensile strength during the rolling operation by mixing with less than 1 part by weight, the impact strength is low and easily damaged by external impact. Compared to that, the result that the biodegradation rate is too delayed can be confirmed.

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In the drawings and the specification, the best embodiment is disclosed, and specific terms are used, but these are used only for the purpose of describing the embodiments of the present invention, and are used to limit the meaning or limit the scope of the present invention described in the claims it didn't happen Therefore, it will be understood by those skilled in the art that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention should be determined by the technical spirit of the appended claims.

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S100: first manufacturing step S110: mixing process
S120: fermentation process S130: aging process
S140: drying process S150: grinding process
S160: extrusion process S200: second manufacturing step

Claims (6)

In the biodegradable mulching film,
10 to 20 parts by weight of livestock;
30-40 parts by weight of thermoplastic starch;
30 to 40 parts by weight of a biodegradable polymer resin;
19 to 20 parts by weight of polylactic acid;
0.5 to 5 parts by weight of potassium hydroxide;
Contains 0.5 to 1.0 parts by weight of magnesium stearate,
The biodegradable mulching film is formed to a thickness of 13 ~ 60㎛,
The livestock meal is based on 100 wt%
70% by weight of livestock manure;
10 to 20% by weight of sawdust;
5 to 10% by weight of the microbial medium;
5 to 10% by weight of the microbial agent,
The livestock manure is a biodegradable mulching film using livestock manure, characterized in that it comprises 49% by weight of cow manure, 14% by weight of chicken manure, and 7% by weight of pig manure.
The method according to claim 1,
The thermoplastic starch,
A biodegradable mulching film using livestock, characterized in that it consists of one or more of the starches produced from sweet potatoes, potatoes, corn, arrowroot, cassava, tapioca, and wheat.
The method according to claim 1,
The biodegradable polymer resin,
Thermoplastic polyester consisting of polylactic acid, polybutylene adipate-co-terephthalate, polybutyleneethylene adipate succinate-co-terephthalate, polybutylene succinate terephthalate and polybutylene ethylene adipate terephthalate A biodegradable mulching film using livestock, characterized in that it consists of at least one type from the group.
delete delete In the method of manufacturing a biodegradable mulching film using the livestock meal constituted according to claim 1,
A first manufacturing step (S100) of preparing a pellet for molding a biodegradable mulching film containing livestock;
A second manufacturing step (S200) of producing a mulching film with a thickness of 13 to 60 μm by rolling the pellets at a temperature of 120 to 185° C. (S200),
The first manufacturing step (S100),
A mixing process (S110) of mixing livestock manure, sawdust, microbial medium and livestock meal containing a microbial agent to produce a mixture, and:
A fermentation process (S120) of stirring the mixture at 20 to 30°C for 3 to 4 hours to produce a fermented product;
Aging step (S130) of aging the fermented product at 20 ~ 25 ℃ for 10 ~ 15 days to produce an aged product;
a drying step (S140) of drying the aged product at 30 to 35° C. for 22 to 24 hours to produce a dried product;
A grinding process (S150) of pulverizing the dried material into 8 to 10 mesh and turning the mixture into a powder;
10 to 20 parts by weight of livestock powder made of powder after the grinding process (S150); 30-40 parts by weight of thermoplastic starch; 30 to 40 parts by weight of a biodegradable polymer resin; 19 to 20 parts by weight of polylactic acid; 0.5 to 5 parts by weight of potassium hydroxide; A method of manufacturing a biodegradable mulching film using livestock flour, comprising an extrusion step (S160) of mixing 0.5 to 1.0 parts by weight of magnesium stearate at 160 to 190° C. for 15 to 30 minutes, extruding and cutting to form pellets.

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