阅读说明：本技术 一种全生物降解抗菌地膜及其制备方法 (Full-biodegradable antibacterial mulching film and preparation method thereof ) 是由 赵福建 于 2021-09-18 设计创作，主要内容包括：本发明涉及一种全生物降解抗菌地膜及其制备方法,该方法制备的全生物降解抗菌地膜包括：PBAT 70％～85％,聚乳酸4％～10％,稳定剂1％～3％,热稳定剂3％～7％,抗静电剂0.5％～1.5％,抗氧剂0.3％～0.7％,脱模剂0.3％～0.7％,抗水解剂3‰～7‰,抗菌剂1‰～5‰,填料3％～7％；该全生物降解抗菌地膜可有效防止细菌酶解带来的地膜过早降解,具有较好的机械性能,适用性高,适宜应用在例如大棚中高温、高湿的环境下,使用寿命长达9～10个月,适用于生长周期长的嫁接农作物,节约生产成本,且满足国家全生物降解标准,降解效率高,降解效果好,不会造成白色污染。(The invention relates to a full-biodegradable antibacterial mulching film and a preparation method thereof, and the full-biodegradable antibacterial mulching film prepared by the method comprises the following steps: 70-85% of PBAT, 4-10% of polylactic acid, 1-3% of stabilizer, 3-7% of heat stabilizer, 0.5-1.5% of antistatic agent, 0.3-0.7% of antioxidant, 0.3-0.7% of release agent, 3-7% of hydrolysis resistant agent, 1-5% of antibacterial agent and 3-7% of filler; the full-biodegradable antibacterial mulching film can effectively prevent premature degradation of the mulching film caused by bacterial enzymolysis, has good mechanical property and high applicability, is suitable for being applied to high-temperature and high-humidity environments in greenhouses, has the service life of 9-10 months, is suitable for grafted crops with long growth cycles, saves the production cost, meets the national full-biodegradable standard, has high degradation efficiency and good degradation effect, and cannot cause white pollution.)

1. The full-biodegradable antibacterial mulching film is characterized by being arranged into one layer or a plurality of layers which are sequentially arranged, wherein at least one layer comprises the following components in percentage by weight:

70-85% of PBAT, 4-10% of polylactic acid, 1-3% of stabilizer, 3-7% of heat stabilizer, 0.5-1.5% of antistatic agent, 0.3-0.7% of antioxidant, 0.3-0.7% of mold release agent, 3-7% of hydrolysis resistant agent, 1-5% of antibacterial agent and 3-7% of filler.

2. The fully biodegradable antibacterial mulching film according to claim 1, wherein the thickness of the fully biodegradable antibacterial mulching film is 0.008mm to 0.012mm, the tensile strength is not less than 15mPa, the longitudinal elongation at break is not less than 350%, and the transverse elongation at break is not less than 400%.

3. The full-biodegradable antibacterial mulching film according to claim 1, wherein the full-biodegradable antibacterial mulching film is provided with an inner layer, a middle layer and an outer layer, and the inner layer and the middle layer respectively comprise the following components in percentage by weight:

70-85% of PBAT, 4-10% of polylactic acid, 1-3% of stabilizer, 3-7% of heat stabilizer, 0.5-1.5% of antistatic agent, 0.3-0.7% of antioxidant, 0.3-0.7% of release agent, 3-7% of hydrolysis resistant agent, 1-5% of antibacterial agent and 3-7% of filler;

the outer layer comprises the following components in percentage by weight:

70 to 85 percent of PBAT, 4 to 10 percent of polylactic acid, 1 to 3 percent of stabilizer, 3 to 7 percent of heat stabilizer, 0.5 to 1.5 percent of antistatic agent, 0.3 to 0.7 percent of antioxidant, 0.3 to 0.7 percent of release agent and 3 to 7 percent of filler.

4. The fully biodegradable antibacterial mulching film according to claim 3, wherein the stabilizer comprises a mixture of one or more of stearic acid, magnesium stearate, aluminum stearate and potassium stearate which are uniformly mixed in any proportion.

5. The full-biodegradable antibacterial mulching film according to claim 3, wherein the heat stabilizer is a mixture of one or more of calcium stearate and zinc stearate which are uniformly mixed in any proportion.

6. The fully biodegradable antibacterial mulching film according to claim 3, wherein the antistatic agent is a mixture of one or more of sulfate, phosphate and polyethylene glycol uniformly mixed in any proportion.

7. The fully biodegradable antibacterial mulching film according to claim 3, wherein the release agent is a mixture of one or more of oleamide, paraffin and glycerol which are mixed uniformly in any proportion.

8. A method for preparing the full-biodegradable antibacterial mulching film according to any one of claims 1-7, comprising the following steps,

s1: weighing the raw materials according to the weight percentage, uniformly mixing the raw materials, and extruding the mixture into granules by a double-screw extruder;

s2: and blowing the granules obtained in the step S1 to obtain the full-biodegradable antibacterial mulching film.

9. The method according to claim 8, wherein the blowing temperature in step S2 is 150 ℃ to 170 ℃.

10. The method of claim 8, wherein the granules are formed into a film by a screw extruder, and the number of the screws is set to correspond to the number of the layers of the full-biodegradable antibacterial mulching film.

Technical Field

The invention relates to the technical field of degradable materials, in particular to a full-biodegradable antibacterial mulching film and a preparation method thereof.

Background

Grafting is used as one of artificial propagation methods for plants, and is characterized by that the branch or bud of one plant is grafted on the stem or root of another plant, so that the two parts connected together can be grown into a complete plant, and the grafting can prolong the growth period of plant and raise yield.

The conventional common full-biodegradable agricultural mulching film has short service life in a high-temperature and high-humidity environment in a greenhouse and cannot be matched with the growth cycle of grafted crops, theoretically, the common full-biodegradable mulching film is covered at least twice in the growth cycle of the grafted crops, so that the production cost and the labor cost are increased, the operation cannot be realized, if the thickness of the mulching film is increased so as to prolong the service life of the mulching film, the production input cost is overhigh, bacteria and pathogenic microorganisms are easy to breed in the high-temperature and high-humidity greenhouse soil, and the crops need to be covered with the mulching film in a seamless manner so as to control the negative influence of the bacteria in the air on the crop development result. The invention prevents bacteria from quickly carrying out enzymolysis on the full-biodegradable mulching film through the antibacterial arrangement, prolongs the service life, and synchronizes the rooting time of the full-biodegradable antibacterial mulching film and the greenhouse grafted crop.

Disclosure of Invention

The invention aims to provide a full-biodegradable antibacterial mulching film and a preparation method thereof, and aims to solve the problems that the existing mulching film cannot resist bacteria and is short in service life.

In order to achieve the purpose, the invention adopts the following technical scheme:

the full-biodegradable antibacterial mulching film is provided with one layer or a plurality of layers which are arranged in sequence, and at least one layer comprises the following components in percentage by weight:

70-85% of PBAT, 4-10% of polylactic acid, 1-3% of stabilizer, 3-7% of heat stabilizer, 0.5-1.5% of antistatic agent, 0.3-0.7% of antioxidant, 0.3-0.7% of mold release agent, 3-7% of hydrolysis resistant agent, 1-5% of antibacterial agent and 3-7% of filler.

Preferably, the thickness of the full-biodegradable antibacterial mulching film is 0.008 mm-0.012 mm, the tensile strength is more than or equal to 15mPa, the longitudinal elongation at break is more than or equal to 350%, and the transverse elongation at break is more than or equal to 400%.

Preferably, the inner layer, the middle layer and the outer layer are provided, and the inner layer and the middle layer respectively comprise the following components in percentage by weight:

70-85% of PBAT, 4-10% of polylactic acid, 1-3% of stabilizer, 3-7% of heat stabilizer, 0.5-1.5% of antistatic agent, 0.3-0.7% of antioxidant, 0.3-0.7% of release agent, 3-7% of hydrolysis resistant agent, 1-5% of antibacterial agent and 3-7% of filler;

the outer layer comprises the following components in percentage by weight:

70 to 85 percent of PBAT, 4 to 10 percent of polylactic acid, 1 to 3 percent of stabilizer, 3 to 7 percent of heat stabilizer, 0.5 to 1.5 percent of antistatic agent, 0.3 to 0.7 percent of antioxidant, 0.3 to 0.7 percent of release agent and 3 to 7 percent of filler.

Preferably, the stabilizing agent comprises a mixture of one or more of stearic acid, magnesium stearate, aluminum stearate and potassium stearate which are mixed uniformly in any proportion.

Preferably, the heat stabilizer is a mixture of one or more of calcium stearate and zinc stearate which are uniformly mixed in any proportion.

Preferably, the antistatic agent is a mixture of one or more of sulfate, phosphate and polyethylene glycol which are uniformly mixed in any proportion.

Preferably, the release agent is a mixture of one or more of oleamide, paraffin and glycerol which are mixed uniformly in any proportion.

The method for preparing the full-biodegradable antibacterial mulching film is characterized by comprising the following steps of,

s1: weighing the raw materials according to the weight percentage, uniformly mixing the raw materials, and extruding the mixture into granules by a double-screw extruder;

s2: blowing the granules obtained in the step S1 to obtain the full-biodegradable antibacterial mulching film

Preferably, the film blowing temperature in step S2 is 150 to 170 ℃.

Preferably, the granules are formed into a film by a screw extruder, and the number of the screws is set corresponding to the number of the layers of the full-biodegradable antibacterial mulching film.

Compared with the prior art, the invention has the beneficial effects that:

according to the technical scheme, the full-biodegradable antibacterial mulching film prepared by the method can effectively prevent bacteria breeding and enzymolysis from rapidly degrading the mulching film, has good mechanical properties and high applicability, is suitable for being applied to high-temperature and high-humidity environments in greenhouses, has the service life of 9-10 months, is suitable for grafted crops with long growth periods, saves the production cost, meets the national full-biodegradation standard, and is high in degradation efficiency, good in degradation effect and free of white pollution.

Detailed Description

The present invention will be described in greater detail below, it being understood that the following description of the present invention is illustrative only and is not limiting. The various embodiments may be combined with each other to form other embodiments not shown in the following description.

The embodiment of the invention provides a full-biodegradable antibacterial mulching film which is formed by sequentially arranging an inner layer, a middle layer and an outer layer, wherein the thickness of the full-biodegradable antibacterial mulching film is 0.008 mm-0.012 mm, the tensile strength is more than or equal to 15mPa, the longitudinal elongation at break is more than or equal to 350%, and the transverse elongation at break is more than or equal to 400%; comprises the following components: PBAT, polylactic acid, a stabilizer, a heat stabilizer, an antistatic agent, an antioxidant, a mold release agent, an anti-hydrolysis agent, an antibacterial agent and a filler.

Wherein PBAT is the main component of the full-biodegradable antibacterial mulching film, mainly comprises a copolymer of poly (adipic acid) and polybutylene terephthalate, and the mass fraction is controlled to be 72-85%.

The mass fraction of the polylactic acid is controlled to be 4-10%, the polylactic acid has good compatibility and biodegradability, can be completely degraded by microorganisms after being used, finally generates carbon dioxide and water, and avoids polluting the environment.

The stabilizer mainly comprises one or more of stearic acid, magnesium stearate, aluminum stearate and potassium stearate which are uniformly mixed in any proportion, the mass fraction is controlled to be 1-3%, the stabilizer can slow down the reaction in the film blowing production, keep the chemical balance, reduce the surface tension, prevent the actions of light, thermal decomposition or oxidative decomposition and the like, and therefore, when the content of the stabilizer is higher than 3%, the full biodegradation rate of the full-biodegradation antibacterial mulching film can be reduced.

The heat stabilizer comprises one or more of calcium stearate and zinc stearate, the mass percentage is controlled to be 3% -7%, and substances with catalytic action on non-chain fracture can be eliminated due to the heat stabilizer, so that the ageing resistance is further improved.

The antistatic agent comprises one or more of sulfate, phosphate and polyethylene glycol which are mixed uniformly in any proportion, the mass fraction is controlled to be 0.5-1.5%, the static accumulation purpose can be reduced, and the full-biodegradable antibacterial mulching film is prevented from rolling up under the action of the static accumulation purpose in the using process to influence the using effect.

The release agent is a mixture of one or more of oleamide, paraffin and glycerol which are uniformly mixed in any proportion, the mass percentage is controlled to be 0.3-0.7%, and the full-biodegradable antibacterial mulching film is prevented from being adhered to a machine during forming.

The filler is magnesium trisilicate, the mass percent is controlled to be 3% -7%, the magnesium trisilicate has a decoloring effect, and the visibility of the full-biodegradable antibacterial mulching film can be improved by adding a certain amount of magnesium trisilicate.

The anti-hydrolysis agent and the antibacterial agent are core components of the full-biodegradation antibacterial mulching film, wherein the mass fraction of the antibacterial agent is controlled to be 1-5 thousandth, the antibacterial agent has a killing effect or a growth inhibition effect on pathogenic microorganisms, but does not hinder normal growth of plants, the full-biodegradation antibacterial mulching film adopts a broad-spectrum silver ion antibacterial agent, and the silver ion antibacterial agent is fixed on the inner layer of the full-biodegradation antibacterial mulching film by methods such as physical adsorption of ions and the like, so that the full-biodegradation antibacterial mulching film achieves the effects of resisting bacteria and killing pathogenic microorganisms; the mass fraction of the hydrolytic resistance agent is controlled between 3 per mill and 7 per mill, wherein the hydrolytic resistance agent plays a synergistic action in the full-biodegradation antibacterial mulching film, can improve the stability of the full-biodegradation antibacterial mulching film in the processing process, improve the melt strength of the full-biodegradation antibacterial mulching film, improve the compatibility among different polymers and among various polymers and antibacterial agents in the full-biodegradation antibacterial mulching film, also can improve the film blowing efficiency of the full-biodegradation antibacterial mulching film and improve the productivity of the full-biodegradation antibacterial mulching film.

Preferably, the hydrolysis resistant agent and the antibacterial agent can be respectively arranged on the inner layer, the middle layer and the outer layer of the full-biodegradable antibacterial mulching film, wherein the inner layer is covered on the root of the crop and is in contact with the soil, so that the harm of bacteria and pathogenic microorganisms in the soil to the crop can be effectively inhibited; the upper layer can prevent stems and leaves of crops from falling on the upper surface of the full-biodegradable antibacterial mulching film to breed bacteria; the middle layer can serve as a reservoir for the lower and upper layers.

The degradation performance of the full-biodegradable antibacterial mulching film meets the national standard of full biodegradation, after the full-biodegradable antibacterial mulching film is used, the full-biodegradable antibacterial mulching film can be degraded in a soil piling mode, and is degraded by using bacteria, mould, saccharomycetes, mycoplasma, viruses, actinomycetes, algae, viruses and other microorganisms in soil, so that the full-biodegradable antibacterial mulching film has a high degradation rate, a good degradation effect, cyclic utilization of degradation products, energy conservation, greenness and environmental protection.

The invention also provides a preparation method of the full-biodegradable antibacterial mulching film, which comprises the following steps:

s1: respectively weighing the raw materials corresponding to the inner layer, the middle layer and the outer layer according to the weight percentage, uniformly mixing the raw materials, and extruding the mixture into granules by a double-screw extruder;

s2: and (4) respectively putting the mixed raw materials obtained in the step (S1) into raw material ports corresponding to a three-screw extruder, firstly changing the granules into molten materials at the temperature of 150-170 ℃, and blowing the molten materials to obtain the full-biodegradable antibacterial mulching film.

The thickness of the full-biodegradable antibacterial mulching film obtained by the method is 0.008 mm-0.012 mm, the tensile strength is more than or equal to 15mPa, the longitudinal elongation at break is more than or equal to 350%, and the transverse elongation at break is more than or equal to 400%.

The fully biodegradable antibacterial mulching film provided by the present application will be further described with reference to the following examples.

Example one

The content of the full-biodegradable antibacterial mulching film in the embodiment is shown in table 1:

(the content of the antibacterial agent and the anti-hydrolysis agent is too low, and the sum of the content of the full-biodegradable antibacterial mulching film is not counted)

TABLE 1

The fully biodegradable antibacterial mulching film in the embodiment is prepared by the following preparation method, and comprises the following steps:

s1: respectively weighing the raw materials corresponding to the inner layer, the middle layer and the outer layer according to the weight percentage, uniformly mixing the raw materials, and extruding the mixture into granules by a double-screw extruder;

s2: and (4) respectively putting the mixed raw materials obtained in the step (S1) into raw material ports corresponding to a three-screw extruder, firstly enabling the granules to be molten at the temperature of 150 ℃, and blowing the molten raw materials to obtain the full-biodegradable antibacterial mulching film.

The thickness of the fully biodegradable antibacterial mulching film obtained in the embodiment is 0.008mm, and the tensile strength of the fully biodegradable antibacterial mulching film is 15mPa, the longitudinal elongation at break is 350%, and the transverse elongation at break is 400% according to a tensile test; the full-biodegradable antibacterial mulching film has excellent mechanical property and good ductility, and can adapt to the covering of different crops.

The full-biodegradation antibacterial mulching film obtained by the embodiment is used for a full-biodegradation experiment, the full-biodegradation antibacterial mulching film with the area of one square meter is put into 1kg of soil, can be degraded for 90% in about 90-120 days, can be completely degraded for about 150 days without residue, meets the national full-biodegradation standard, is high in degradation rate, does not generate white pollution, and has extremely high popularization and application performance.

Example two

The content of the full-biodegradable antibacterial mulching film in the embodiment is shown in table 2:

(the content of the antibacterial agent and the anti-hydrolysis agent is too low, and the sum of the content of the full-biodegradable antibacterial mulching film is not counted)

TABLE 2

The fully biodegradable antibacterial mulching film in the embodiment is prepared by the following preparation method, and comprises the following steps:

s1: respectively weighing the raw materials corresponding to the inner layer, the middle layer and the outer layer according to the weight percentage, uniformly mixing the raw materials, and extruding the mixture into granules by a double-screw extruder;

s2: and (4) respectively putting the mixed raw materials obtained in the step (S1) into raw material ports corresponding to a three-screw extruder, firstly changing the granules into molten materials at the temperature of 155 ℃, and blowing the molten materials to obtain the full-biodegradable antibacterial mulching film.

The thickness of the fully biodegradable antibacterial mulching film obtained in the embodiment is 0.008mm, and the tensile strength of the fully biodegradable antibacterial mulching film is 15mPa, the longitudinal elongation at break is 350%, and the transverse elongation at break is 400% according to a tensile test; the full-biodegradable antibacterial mulching film has excellent mechanical property and good ductility, and can adapt to the covering of different crops.

The full-biodegradation antibacterial mulching film obtained by the embodiment is used for a full-biodegradation experiment, the full-biodegradation antibacterial mulching film with the area of one square meter is put into 1kg of soil, can be degraded for 90% in about 90-120 days, can be completely degraded for about 150 days without residue, meets the national full-biodegradation standard, is high in degradation rate, does not generate white pollution, and has extremely high popularization and application performance.

EXAMPLE III

The content of the fully biodegradable antibacterial mulching film in the embodiment is shown in table 3:

(the content of the antibacterial agent and the anti-hydrolysis agent is too low, and the sum of the content of the full-biodegradable antibacterial mulching film is not counted)

TABLE 3

The fully biodegradable antibacterial mulching film in the embodiment is prepared by the following preparation method, and comprises the following steps:

s1: respectively weighing the raw materials corresponding to the inner layer, the middle layer and the outer layer according to the weight percentage, uniformly mixing the raw materials, and extruding the mixture into granules by a double-screw extruder;

s2: and (4) respectively putting the mixed raw materials obtained in the step (S1) into raw material ports corresponding to a three-screw extruder, firstly enabling the granules to be molten at the temperature of 160 ℃, and blowing the molten raw materials to obtain the full-biodegradable antibacterial mulching film.

The thickness of the fully biodegradable antibacterial mulching film obtained in the embodiment is 0.008mm, and the tensile strength of the fully biodegradable antibacterial mulching film is 15mPa, the longitudinal elongation at break is 350%, and the transverse elongation at break is 400% according to a tensile test; the full-biodegradable antibacterial mulching film has excellent mechanical property and good ductility, and can adapt to the covering of different crops.

The full-biodegradation antibacterial mulching film obtained by the embodiment is used for a full-biodegradation experiment, the full-biodegradation antibacterial mulching film with the area of one square meter is put into 1kg of soil, can be degraded for 90% in about 90-120 days, can be completely degraded for about 150 days without residue, meets the national full-biodegradation standard, is high in degradation rate, does not generate white pollution, and has extremely high popularization and application performance.

Example four

The content of the fully biodegradable antibacterial mulching film in the embodiment is shown in table 4:

(the content of the antibacterial agent and the anti-hydrolysis agent is too low, and the sum of the content of the full-biodegradable antibacterial mulching film is not counted)

TABLE 4

The fully biodegradable antibacterial mulching film in the embodiment is prepared by the following preparation method, and comprises the following steps:

s1: respectively weighing the raw materials corresponding to the inner layer, the middle layer and the outer layer according to the weight percentage, uniformly mixing the raw materials, and extruding the mixture into granules by a double-screw extruder;

s2: and (4) respectively putting the mixed raw materials obtained in the step (S1) into raw material ports corresponding to a three-screw extruder, firstly enabling the granules to be molten at the temperature of 160 ℃, and blowing the molten raw materials to obtain the full-biodegradable antibacterial mulching film.

The thickness of the fully biodegradable antibacterial mulching film obtained in the embodiment is 0.009mm, and the tensile strength of the fully biodegradable antibacterial mulching film is 20mPa, the longitudinal elongation at break is 360%, and the transverse elongation at break is 410% according to a tensile test; the full-biodegradable antibacterial mulching film has excellent mechanical property and good ductility, and can adapt to the covering of different crops.

The full-biodegradation antibacterial mulching film obtained by the embodiment is used for a full-biodegradation experiment, the full-biodegradation antibacterial mulching film with the area of one square meter is put into 1kg of soil, can be degraded for 90% in about 90-120 days, can be completely degraded for about 150 days without residue, meets the national full-biodegradation standard, is high in degradation rate, does not generate white pollution, and has extremely high popularization and application performance.

EXAMPLE five

The content of the fully biodegradable antibacterial mulching film in the embodiment is shown in table 5:

(the content of the antibacterial agent and the anti-hydrolysis agent is too low, and the sum of the content of the full-biodegradable antibacterial mulching film is not counted)

TABLE 5

The fully biodegradable antibacterial mulching film in the embodiment is prepared by the following preparation method, and comprises the following steps:

s1: respectively weighing the raw materials corresponding to the inner layer, the middle layer and the outer layer according to the weight percentage, uniformly mixing the raw materials, and extruding the mixture into granules by a double-screw extruder;

s2: and (4) respectively putting the mixed raw materials obtained in the step (S1) into raw material ports corresponding to a three-screw extruder, firstly enabling the granules to be molten at the temperature of 165 ℃, and blowing the molten raw materials to obtain the full-biodegradable antibacterial mulching film.

The thickness of the fully biodegradable antibacterial mulching film obtained in the embodiment is 0.01mm, and the tensile strength of the fully biodegradable antibacterial mulching film is 25mPa, the longitudinal elongation at break is 370%, and the transverse elongation at break is 420% according to a tensile test; the full-biodegradable antibacterial mulching film has excellent mechanical property and good ductility, and can adapt to the covering of different crops.

The full-biodegradation antibacterial mulching film obtained by the embodiment is used for a full-biodegradation experiment, the full-biodegradation antibacterial mulching film with the area of one square meter is put into 1kg of soil, can be degraded for 90% in about 90-120 days, can be completely degraded for about 150 days without residue, meets the national full-biodegradation standard, is high in degradation rate, does not generate white pollution, and has extremely high popularization and application performance.

EXAMPLE six

The content of the fully biodegradable antibacterial mulching film in the embodiment is shown in table 6:

(the content of the antibacterial agent and the anti-hydrolysis agent is too low, and the sum of the content of the full-biodegradable antibacterial mulching film is not counted)

TABLE 6

The fully biodegradable antibacterial mulching film in the embodiment is prepared by the following preparation method, and comprises the following steps:

s1: respectively weighing the raw materials corresponding to the inner layer, the middle layer and the outer layer according to the weight percentage, uniformly mixing the raw materials, and extruding the mixture into granules by a double-screw extruder;

s2: and (4) respectively putting the mixed raw materials obtained in the step (S1) into raw material ports corresponding to a three-screw extruder, firstly changing the granules into molten materials at the temperature of 170 ℃, and blowing the molten materials to obtain the full-biodegradable antibacterial mulching film.

The thickness of the full-biodegradable antibacterial mulching film obtained in the embodiment is 0.012mm, and the tensile strength of the full-biodegradable antibacterial mulching film is 30mPa, the longitudinal elongation at break is 380%, and the transverse elongation at break is 430% according to a tensile test; the full-biodegradable antibacterial mulching film has excellent mechanical property and good ductility, and can adapt to the covering of different crops.

The full-biodegradation antibacterial mulching film obtained by the embodiment is used for a full-biodegradation experiment, the full-biodegradation antibacterial mulching film with the area of one square meter is put into 1kg of soil, can be degraded for 90% in about 90-120 days, can be completely degraded for about 150 days without residue, meets the national full-biodegradation standard, is high in degradation rate, does not generate white pollution, and has extremely high popularization and application performance.

In a first comparative experiment, a fully biodegradable antibacterial mulching film is prepared by the same method as in the first comparative example, except that the content of PBAT in the first comparative example is 72%, and the content is as shown in the following table 5:

comparative example 1

The content of the fully biodegradable antibacterial mulching film in the example is shown in table 7:

(the content of the antibacterial agent and the anti-hydrolysis agent is too low, and the sum of the content of the full-biodegradable antibacterial mulching film is not counted)

TABLE 7

The fully biodegradable antibacterial mulching film in the embodiment is prepared by the following preparation method, and comprises the following steps:

s1: respectively weighing the raw materials corresponding to the inner layer, the middle layer and the outer layer according to the weight percentage, uniformly mixing the raw materials, and extruding the mixture into granules by a double-screw extruder;

s2: and (4) respectively putting the mixed raw materials obtained in the step (S1) into raw material ports corresponding to a three-screw extruder, firstly enabling the granules to be molten at the temperature of 160 ℃, and blowing the molten raw materials to obtain the full-biodegradable antibacterial mulching film.

The thickness of the full-biodegradable antibacterial mulching film obtained in the embodiment is 0.005mm, and the tensile strength of the full-biodegradable antibacterial mulching film is 12mPa, the longitudinal elongation at break of the full-biodegradable antibacterial mulching film is 340%, and the transverse elongation at break of the full-biodegradable antibacterial mulching film is 390% according to a tensile test.

The full-biodegradation antibacterial mulching film obtained by the embodiment is used for a full-biodegradation experiment, the full-biodegradation antibacterial mulching film with the area of one square meter is put into 1kg of soil, can be degraded for 90% in about 90-120 days, can be completely degraded for about 150 days without residue, meets the national full-biodegradation standard, is high in degradation rate, does not generate white pollution, and has extremely high popularization and application performance.

A second comparative experiment is carried out, and the second comparative example adopts the same method as the sixth example to prepare the full-biodegradable antibacterial mulching film, and is different from the second comparative example in that the PBAT content of the second comparative example is 86 percent, and the content is shown in the following table 5:

comparative example No. two

The content of the fully biodegradable antibacterial mulching film in the example is shown in table 8:

(the content of the antibacterial agent and the anti-hydrolysis agent is too low, and the sum of the content of the full-biodegradable antibacterial mulching film is not counted)

TABLE 8

The fully biodegradable antibacterial mulching film in the embodiment is prepared by the following preparation method, and comprises the following steps:

s1: respectively weighing the raw materials corresponding to the inner layer, the middle layer and the outer layer according to the weight percentage, uniformly mixing the raw materials, and extruding the mixture into granules by a double-screw extruder;

s2: and (4) respectively putting the mixed raw materials obtained in the step (S1) into raw material ports corresponding to a three-screw extruder, firstly changing the granules into molten materials at the temperature of 170 ℃, and blowing the molten materials to obtain the full-biodegradable antibacterial mulching film.

The thickness of the fully biodegradable antibacterial mulching film obtained in the embodiment is 0.015mm, and the tensile strength of the fully biodegradable antibacterial mulching film is 13mPa, the longitudinal elongation at break of the fully biodegradable antibacterial mulching film is 330%, and the transverse elongation at break of the fully biodegradable antibacterial mulching film is 380% according to a tensile test.

The full-biodegradation antibacterial mulching film obtained by the embodiment is used for a full-biodegradation experiment, the full-biodegradation antibacterial mulching film with the area of one square meter is put into 1kg of soil, can be degraded for 90% in about 90-120 days, can be completely degraded for about 150 days without residue, meets the national full-biodegradation standard, is high in degradation rate, does not generate white pollution, and has extremely high popularization and application performance.

The performances of the full-biodegradable antibacterial mulching film prepared from the components are shown in the table 9:

TABLE 9

By the above embodiment, it can be derived that:

the full-biodegradable antibacterial mulching film prepared by the method can effectively prevent bacterial enzymolysis from accelerating full biodegradation of the mulching film, has good mechanical properties and high applicability, is suitable for being applied to high-temperature and high-humidity environments in greenhouses, has a long service life of 9-10 months, is suitable for grafted crops with long growth cycles, saves production cost, meets the national full-biodegradation standard, and has high degradation efficiency and good degradation effect, and white pollution cannot be caused.

The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.