阅读说明：本技术 一种生物降解bopp薄膜的高效复合催化剂及其制备方法与应用 (Efficient composite catalyst for biodegradable BOPP film and preparation method and application thereof ) 是由 赵晏竹 许乃强 梁俊雄 于 2021-08-17 设计创作，主要内容包括：本发明公开了一种生物降解BOPP薄膜的高效复合催化剂,由以下重量份的组分组成：促进光和/或热氧催化功能的金属有机化合物2-15份；分子中含有羰基的发色基团和弱键的有机化合物1-5份；促进生物降解的生物活性酶1-5份；天然经改性制得的表面活性剂1-5份；载体聚丙烯树脂85-90份,该高效复合催化剂只需在露天陆地环境条件下就可以实现BOPP薄膜材料生物降解。本发明还公开了一种生物降解BOPP薄膜的高效复合催化剂的制备方法与应用。(The invention discloses an efficient composite catalyst for a biodegradable BOPP film, which comprises the following components in parts by weight: 2-15 parts of metal organic compound for promoting light and/or thermal oxidation catalytic function; 1-5 parts of organic compound containing carbonyl chromophoric group and weak bond in molecule; 1-5 parts of biological active enzyme for promoting biodegradation; 1-5 parts of natural modified surfactant; 85-90 parts of carrier polypropylene resin, and the high-efficiency composite catalyst can realize biodegradation of the BOPP film material only under the open land environment condition. The invention also discloses a preparation method and application of the high-efficiency composite catalyst for the biodegradable BOPP film.)

1. The high-efficiency composite catalyst for the biodegradable BOPP film is characterized by comprising the following components in parts by weight:

the metal organic compound for promoting the photo-and/or thermal-oxidative catalysis function is formed by mixing one or more of organic iron, organic manganese, organic calcium, organic nickel, organic cerium and organic lanthanum;

the organic compound containing carbonyl chromophoric group and weak bond in the molecule is formed by mixing one or more of benzophenone, p-benzoquinone, polypropylene glycol and organosiloxane;

the biological active enzyme for promoting biodegradation is formed by mixing one or more of cellulase, protease and citric acid;

the natural modified surfactant is prepared by mixing one or more of tea saponin, saponins, sorbitan fatty acid ester, sucrose fatty acid ester, sophorolipid and algal glycolipid.

2. The high-efficiency composite catalyst for biodegradable BOPP film according to claim 1, wherein the organometallic compound for promoting photo-and/or thermo-oxidative catalysis is one or more of ferric stearate, manganese stearate, calcium stearate, nickel stearate, cerium stearate and lanthanum stearate.

3. The high-efficiency composite catalyst for the biodegradation of BOPP film according to claim 1, wherein the catalyst comprises the following components in parts by weight:

2-3 parts of cerium stearate, 3-4 parts of manganese stearate, 2-3 parts of calcium stearate, 1 part of organosiloxane, 1 part of cellulase, 1 part of sucrose fatty acid ester and 87-90 parts of carrier polypropylene resin.

4. The high-efficiency composite catalyst for the biodegradation of BOPP film according to claim 1, wherein the catalyst comprises the following components in parts by weight:

2-3 parts of cerium stearate, 3-4 parts of manganese stearate, 2-3 parts of lanthanum stearate, 1 part of organosiloxane, 1 part of cellulase, 1 part of sucrose fatty acid ester and 87-90 parts of carrier polypropylene resin.

5. The preparation method and the application of the high-efficiency composite catalyst for the biodegradation of the BOPP film according to claim 1 are characterized by comprising the following steps:

weighing the components in parts by weight; placing the components in a high-speed mixer, mixing at the rotating speed of 1500 plus 1800 rpm for 5-10 minutes, and uniformly mixing to prepare a mixture; and then sending the mixture into a double-screw extruder and a granulating and pelletizing unit, and carrying out extrusion and pelletizing under the conditions that the temperature of an extrusion section is 150-.

6. The use of the high efficiency composite catalyst for biodegradable BOPP film according to any one of claims 1 to 4 in the preparation of biodegradable high transparency BOPP film.

7. The application of the high-efficiency composite catalyst for the biodegradable BOPP film according to claim 6, wherein the biodegradable high-transparency BOPP film is composed of polypropylene resin and the high-efficiency composite catalyst, and the mass content of the high-efficiency composite catalyst in the biodegradable high-transparency BOPP film is 1-2%.

8. The use of the high efficiency composite catalyst for biodegradation of BOPP film according to claim 6, wherein in open land environment, said high efficiency composite catalyst oxidatively cleaves the macromolecular chains of BOPP film material into carbonyl-containing carboxylic acids, ketones, and small molecular compounds, and the decrease in molecular weight is not the result of simple chain scission of low BOPP film material, but the result of carbonyl formation at each breakpoint.

Technical Field

The invention relates to an efficient composite catalyst for biodegradation of a BOPP film, and a preparation method and application thereof.

Background

BOPP is an abbreviation for "biaxialy organized Polypropylene", a BOPP film, i.e. a Biaxially Oriented Polypropylene film. BOPP films are produced by first passing a melt of high molecular polypropylene through a long and narrow head to form a sheet or thick film, then stretching the film in two perpendicular directions (longitudinal and transverse) simultaneously or stepwise at a certain temperature and a set speed in a special stretching machine, and subjecting the film to appropriate cooling or heat treatment or special processing (e.g. corona, coating, etc.).

The BOPP film is a very important flexible packaging material, is colorless, odorless, tasteless and nontoxic, and has high tensile strength, impact strength, rigidity, toughness and good transparency.

BOPP films are considered as queen in packaging for packaging, preservation, and transportation of various products. According to the situation shown by the research of countries and regions with different development conditions, the demand of each country for the BOPP film is increased, the demand of developed countries such as Japan and the United states for the BOPP film is increased by about 8%, the annual increase rate of the developing countries for the BOPP film is as high as 17% -18%, and the demand of each country for the BOPP film is expected to continuously increase along with the increase of population and the development of food industry.

Along with the development of society and the improvement of living standard of people, the demand of people on the BOPP film is increased, and simultaneously, the requirements on the performance and the efficacy of the BOPP film are stricter. Currently, BOPP films are used as heat sealing films, packaging films, cigarette packaging films, pearlized films, metallized films, matte films, antifogging films, anti-counterfeiting films, paper ball films, and the like, and thus BOPP films are required to have high heat resistance, low permeability, high transparency, and other excellent properties.

BOPP films are not only used for ordinary food packaging, but also used in the fields of heat sealing, color printing, radiation protection and the like, and new application values thereof are required to be continuously developed. According to the research results and numerous data, the BOPP film industry is shown to enter a rapid development process, plays more and more important roles in life, faces certain problems, admittedly, challenges and opportunities coexist, still has huge development space and development needs, but needs to follow the technological requirements of scientific specialties, keep pace with the steps of the times, continuously draw experience, and can obtain steady development.

BOPP films are widely used throughout the world and are on the increasing trend year by year. They come from industry, are manufactured by human beings, and are not easily absorbed by nature when finally attributed to nature, thereby influencing the ecological environment of nature. "white pollution" is an environmental pollution problem in all cities around the world, and a large amount of waste plastic products can be seen everywhere in various public places. In the face of increasingly serious 'white pollution', a recovery mode is adopted as far as possible from the viewpoint of resource saving, but the recovery production cost at the present stage is far higher than the direct production cost, so that the recovery method is difficult to realize under the economic condition of the current market. Therefore, people hope to find a plastic substitute which has the performance of the existing plastic and does not cause white pollution, and the degradable plastic is produced at the same time, and is a novel functional plastic which is characterized in that after the plastic is abandoned after reaching a certain service life, the chemical structure of the plastic is obviously changed under the condition of natural environment, certain performance loss and appearance change are caused to degrade, and the plastic is harmless or less harmful to the natural environment. For the packaging industry, a green concept is implemented, namely a specific target of 'conversion from traditional production to green production' is realized in 'a firm object to excessive packaging' and a packaging industry transformation development guidance suggestion, and 'green, low-carbon and environment-friendly' are main shafts of development of the packaging industry in the future.

In the technical aspect, firstly, paper is adopted to replace plastic; secondly, degradable plastics are adopted; thirdly, the existing traditional plastics are replaced by full-biodegradable materials; fourthly, oxidative biodegradation, which is a technology not known by most people in China, and the method for adding the additive into the traditional plastic production raw material is the same as the method for adding the common color master batch. After the plastic product is discarded, two substances in the additive play a role: one is pre-oxidant (mainly some non-toxic metal ions) and the other is biodegradation promoting substance (mainly some natural plant cellulose). The preoxidant controls the service life and functions of the plastic when the plastic is not abandoned, and the molecular weight is reduced through oxidation reaction after the plastic is abandoned, so that the polymer becomes brittle and is easy to decompose by microorganisms. The biodegradation promoting substance is mainly used for promoting the breeding of microorganisms. Compared with other biodegradable plastic technologies, the technology is simple and feasible, the cost is reduced, and common equipment can be used for production. According to relevant verification, the original performance of the plastic is well maintained, and the method is adopted by many companies internationally.

75% of all plastic that was discarded at will was land waste. It is widely accepted that land refuse disposables undergo weathering, which typically results in the formation of micro-plastics, followed by limited biodegradation of the soil depending on environmental conditions. Due to the increasing severity of the plastic contamination problem, and the need for innovations in current polyolefin plastics. Although the existing degradable plastic technology is widely applied to disposable plastic products (such as shopping bags, garbage bags and the like), no obvious breakthrough is made on the degradable BOPP films which require high transparency, high gloss and the like for packaging a plurality of foods, cigarettes, electronic products and the like.

Disclosure of Invention

The invention aims to overcome the defects of the prior art, and provides an efficient composite catalyst for biodegradation of a BOPP film, which can realize biodegradation of a BOPP film material only under the open land environment condition, wherein degradation products are carbon dioxide, water and biomass, so that the generation of micro-plastics is avoided, and white pollution caused by the traditional BOPP film plastic is effectively solved.

The invention also aims to provide a preparation method and application of the high-efficiency composite catalyst for the biodegradable BOPP film.

One technical scheme for achieving the purpose is as follows: an efficient composite catalyst for biodegradable BOPP films comprises the following components in parts by weight:

the metal organic compound for promoting the photo-and/or thermal-oxidative catalysis function is formed by mixing one or more of organic iron, organic manganese, organic calcium, organic nickel, organic cerium and organic lanthanum;

the organic compound containing carbonyl chromophoric group and weak bond in the molecule is formed by mixing one or more of benzophenone, p-benzoquinone, polypropylene glycol and organosiloxane;

the biological active enzyme for promoting biodegradation is formed by mixing one or more of cellulase, protease and citric acid;

the natural modified surfactant is prepared by mixing one or more of tea saponin, saponins, sorbitan fatty acid ester, sucrose fatty acid ester, sophorolipid and algal glycolipid.

The high-efficiency composite catalyst for the biodegradable BOPP film is characterized in that the metal organic compound for promoting the photo-and/or thermal oxidation catalysis function is formed by mixing one or more of ferric stearate, manganese stearate, calcium stearate, nickel stearate, cerium stearate and lanthanum stearate

The high-efficiency composite catalyst for the biodegradable BOPP film comprises the following components in parts by weight:

2-3 parts of cerium stearate, 3-4 parts of manganese stearate, 2-3 parts of calcium stearate, 1 part of organosiloxane, 1 part of cellulase, 1 part of sucrose fatty acid ester and 87-90 parts of carrier polypropylene resin.

The high-efficiency composite catalyst for the biodegradable BOPP film comprises the following components in parts by weight:

2-3 parts of cerium stearate, 3-4 parts of manganese stearate, 2-3 parts of lanthanum stearate, 1 part of organosiloxane, 1 part of cellulase, 1 part of sucrose fatty acid ester and 87-90 parts of carrier polypropylene resin.

The invention also provides a preparation method of the high-efficiency composite catalyst for the biodegradable BOPP film, which comprises the following steps:

weighing the components in parts by weight; placing the components in a high-speed mixer, mixing at the rotating speed of 1500 plus 1800 rpm for 5-10 minutes, and uniformly mixing to prepare a mixture; and then sending the mixture into a double-screw extruder and a granulating and pelletizing unit, and carrying out extrusion and pelletizing under the conditions that the temperature of an extrusion section is 150-.

The invention also provides application of the high-efficiency composite catalyst for the biodegradable BOPP film in preparation of the biodegradable high-transparency BOPP film.

The application of the high-efficiency composite catalyst for the biodegradable BOPP film is characterized in that the biodegradable high-transparency BOPP film is composed of polypropylene resin and the high-efficiency composite catalyst, and the mass content of the high-efficiency composite catalyst in the biodegradable high-transparency BOPP film is 1-2%.

The application of the high-efficiency composite catalyst for biodegradation of the BOPP film is characterized in that in an open land environment, the high-efficiency composite catalyst oxidizes and breaks macromolecular chains of the BOPP film material into carboxylic acids and ketone small-molecular compounds containing carbonyl groups, and the reduction of the molecular weight is not a result of simple chain breaking of the low BOPP film material but a result of formation of the carbonyl groups at each breaking point.

By adopting the high-efficiency composite catalyst for the biodegradable BOPP film and the preparation method and the application technical scheme thereof, the prepared high-efficiency composite catalyst can realize the biodegradation of the BOPP film material only under the open land environment condition; the high-efficiency composite catalyst is added into the BOPP film material to prepare the biodegradable high-transparency BOPP film, the high-efficiency composite catalyst oxidizes and breaks macromolecular chains of the BOPP film material into carboxylic acids and ketone micromolecule compounds containing carbonyl in an open land environment, and the reduction of the molecular weight does not result in simple chain breaking of the low BOPP film material but results in the formation of the carbonyl at each breaking point. The method effectively changes the hydrophobicity of simple hydrocarbon, and converts the BOPP film material into carboxylic acid and ketone compounds with short chain to medium chain, so that the BOPP film material is more hydrophilic and easier to biodegrade. After the molecular weight of the polymer is sufficiently reduced, the polymer can be subjected to microbial degradation, the polymer is further decomposed into carbon dioxide, water and biomass, the generation of micro-plastics is avoided, and the problem of white pollution caused by the traditional polyolefin plastics is effectively solved.

Detailed Description

In order that those skilled in the art will better understand the technical solution of the present invention, the following detailed description will be given of specific embodiments thereof:

example 1:

an efficient composite catalyst for biodegradable BOPP films comprises the following components in parts by weight:

2-3 parts of cerium stearate, 3-4 parts of manganese stearate, 2-3 parts of calcium stearate, 1 part of organosiloxane, 1 part of cellulase, 1 part of sucrose fatty acid ester and 87-90 parts of carrier polypropylene resin.

Example 2:

an efficient composite catalyst for biodegradable BOPP films comprises the following components in parts by weight:

2-3 parts of cerium stearate, 3-4 parts of manganese stearate, 2-3 parts of lanthanum stearate, 1 part of organosiloxane, 1 part of cellulase, 1 part of sucrose fatty acid ester and 87-90 parts of carrier polypropylene resin.

In example 1 and example 2, the high-efficiency composite catalyst for the biodegradable BOPP film was prepared by the following preparation method:

weighing the components in parts by weight; placing the components in a high-speed mixer, mixing at the rotating speed of 1500 plus 1800 rpm for 5-10 minutes, and uniformly mixing to prepare a mixture; and then sending the mixture into a double-screw extruder and a granulating and pelletizing unit, and carrying out extrusion and pelletizing under the conditions that the temperature of an extrusion section is 150-.

In examples 1 and 2, cerium stearate, manganese stearate, calcium stearate, and lanthanum stearate are organometallic compounds that promote light and/or thermal oxidation catalytic functions; the organosiloxane is an organic compound containing carbonyl chromophoric groups and weak bonds in molecules; cellulase is a biologically active enzyme that promotes biodegradation; sucrose fatty acid ester is a surfactant prepared by natural modification; the polypropylene resin is a carrier for the above active ingredients.

The metal organic compound for promoting the light and/or thermal oxidation catalytic function can also be formed by mixing one or more of organic iron, organic manganese, organic calcium, organic nickel, organic cerium and organic lanthanum; the organic compound containing carbonyl chromophoric group and weak bond in the molecule can also be prepared by mixing one or more of benzophenone, p-benzoquinone, polypropylene glycol and organosiloxane; the biological active enzyme for promoting biodegradation can also be prepared by mixing one or more of cellulase, protease and citric acid; the natural modified surfactant can also be prepared by mixing one or more of tea saponin, saponins, sorbitan fatty acid ester, sucrose fatty acid ester, sophorolipid and trehalose glycolipid.

The high-efficiency composite catalyst is applied to preparation of biodegradable high-transparency BOPP films. The biodegradable high-transparency BOPP film consists of polypropylene resin and the high-efficiency composite catalyst, and the mass content of the high-efficiency composite catalyst in the biodegradable high-transparency BOPP film is 1-2%

Example 3:

a biodegradable high-transparency BOPP film is prepared by uniformly mixing master batches of the high-efficiency composite catalyst prepared by the preparation method with polypropylene resin, then adopting the traditional process for preparing the BOPP film, preparing a melt obtained by melting the uniformly mixed materials into a sheet or a thick film by a long and narrow machine head, stretching the sheet or the thick film in two vertical directions (longitudinal direction and transverse direction) simultaneously or step by step in a special stretcher at a certain temperature and a set speed, and performing appropriate cooling or heat treatment or special processing (such as corona, coating and the like).

Various properties were tested according to the relevant standards:

(1) the results of the physical property measurements are shown in Table 1:

TABLE 1

(2) The photo-oxidative catalysis/thermal-oxidative catalysis degradation process and verification are as follows: and (2) exposing the test sample of the biodegradable high-transparency BOPP film to the sun by using a UV ultraviolet aging box, wherein the UV ultraviolet aging box is used for completely simulating the degradation process under the natural environment condition, the temperature is kept at 60 ℃, a light source is turned on for 8 hours every day and then turned off for 16 hours, the test sample is found to begin to have yellowing and brittleness after 14 days of repetition, and irregular-shaped fragments are formed after 20 days. In order to characterize the process, the biodegradable high-transparency BOPP film is subjected to chemical reaction without simple physical change (fragmentation into micro-plastics), carbonyl indexes of aged fragments are characterized by using ATR-FTIR total reflection attenuation-Fourier transform infrared spectroscopy, and the carbonyl indexes are increased along with the aging process, which shows that small molecular compound carboxylic acids and ketones containing carbonyl are continuously generated at each point of fracture of the biodegradable high-transparency BOPP film along with the progress of the photo-oxidation catalysis/thermal oxidation catalysis degradation process. Meanwhile, the molecular weight of the aged and degraded fragments is measured by GPC gel permeation chromatography, and the molecular weight is smaller and smaller along with the progress of the photo-oxidative catalysis/thermo-oxidative catalysis degradation process, so that the next step of biological decomposition is facilitated.

(3) Measurement of the physicomechanical Properties after ageing: compared with the biodegradable high-transparency BOPP film before degradation, the indexes such as tensile strength, elongation at break, elastic modulus and the like after the test of the sample is finished are obviously reduced, and the physical and mechanical properties are completely lost along with the degradation process.

(4) And (3) biodegradation process and verification: and moving the aged fragments into a composting machine, and performing biodegradation according to the GB/T19277 requirement, wherein the biological decomposition rate of the fragments is measured by using a carbon dioxide precipitation method in the process, and the biological decomposition rate is higher and higher along with the increase of the composting time, so that complete decomposition is finally achieved.

And (4) conclusion: the biodegradable high-transparency BOPP film sample added with 1% of the high-efficiency composite catalyst is subjected to aging degradation through exposure of a UV ultraviolet aging box, the aged and degraded sample is finally and completely biodegraded in an aerobic composting environment, and the BOPP film added with the catalyst is further judged to be capable of accelerating aging degradation in a natural environment and then realizing complete biodegradation in the aerobic composting environment.

Example 4:

a biodegradable high-transparency BOPP film is prepared from 98% of polypropylene resin and 2% of high-efficiency composite catalyst through uniformly mixing the mother particles of high-efficiency composite catalyst prepared by the preparation method of the invention with the polypropylene resin, melting the uniformly mixed materials by a conventional BOPP film preparation process, preparing the molten material into a sheet or a thick film by a long and narrow machine head, stretching the sheet or the thick film in two vertical directions (longitudinal and transverse directions) simultaneously or step by step in a special stretching machine at a certain temperature and a set speed, and performing proper cooling or heat treatment or special processing (such as corona, coating and the like).

Various properties were tested according to the relevant standards:

(1) the results of the physical property measurements are shown in Table 2:

TABLE 2

(2) The photo-oxidative catalysis/thermal-oxidative catalysis degradation process and verification are as follows: and (2) exposing the biodegradable high-transparency BOPP film test sample by using a UV (ultraviolet) aging box, wherein the UV aging box is used for completely simulating the degradation process under the natural environment condition, the temperature is kept at 60 ℃, a light source is turned on for 8 hours every day and then turned off for 16 hours, the test sample is found to begin to have yellowing and embrittlement after 12 days of repetition, and fragments with irregular shapes are formed after 15 days. In order to characterize the process, the biodegradable high-transparency BOPP film is subjected to chemical reaction without simple physical change (fragmentation into micro-plastics), carbonyl indexes of aged fragments are characterized by using ATR-FTIR total reflection attenuation-Fourier transform infrared spectroscopy, and the carbonyl indexes are increased along with the aging process, which shows that small molecular compound carboxylic acids and ketones containing carbonyl are continuously generated at each point of fracture of the biodegradable high-transparency BOPP film along with the progress of the photo-oxidation catalysis/thermal oxidation catalysis degradation process. Meanwhile, the molecular weight of the aged and degraded fragments is measured by GPC gel permeation chromatography, and the molecular weight is smaller and smaller along with the progress of the photo-oxidative catalysis/thermo-oxidative catalysis degradation process, so that the next step of biological decomposition is facilitated.

(3) Measurement of the physicomechanical Properties after ageing: compared with the biodegradable high-transparency BOPP film before degradation, relevant indexes such as tensile strength, elongation at break, elastic modulus and the like of a test sample after the test are obviously reduced, and the physical and mechanical properties are completely lost along with the degradation process.

(4) And (3) biodegradation process and verification: and moving the aged fragments into a composting machine, and performing biodegradation according to the GB/T19277 requirement, wherein the biological decomposition rate of the fragments is measured by using a carbon dioxide precipitation method in the process, and the biological decomposition rate is higher and higher along with the increase of the composting time, so that complete decomposition is finally achieved.

And (4) conclusion: the biodegradable high-transparency BOPP film sample added with 2% of the high-efficiency composite catalyst is subjected to aging degradation through exposure of a UV (ultraviolet) aging box, the aging degradation time is obviously shortened compared with that of the sample added with 1% of the high-efficiency catalyst, the sample subjected to aging degradation is still completely biodegraded finally in an aerobic composting environment, the BOPP film added with the catalyst is further judged to be capable of accelerating aging degradation in a natural environment and then realizing complete biodegradation in the aerobic composting environment, and the degradation time in the natural environment can be controlled by adjusting the proportion of the high-efficiency catalyst.

The high-efficiency composite catalyst for the biodegradable BOPP film, the preparation method and the application thereof have the following advantages:

(1) the high-efficiency composite catalyst can realize biodegradation of BOPP film materials, and degradation products are carbon dioxide, water and biomass, so that micro-plastics are avoided and white pollution caused by the traditional BOPP film plastics is effectively solved;

(2) according to the high-efficiency composite catalyst, degradation conditions are designed according to a treatment mode after the BOPP film is used up, so that biodegradation can be realized in an aerobic environment no matter in a discarding, landfill or composting environment, and the restriction of the degradation environment is smaller;

(3) the addition amount of the high-efficiency composite catalyst in an experimental sample is only 1% -2%, the physical and mechanical properties and the service performance of the original BOPP film are well maintained, the inherent properties of the BOPP film are maintained, and the performance requirement of post-processing is met. The BOPP film has the advantages that various product performances are excellent, the transparency and the glossiness are good, the cold resistance and the surface printing surface friction resistance are excellent, meanwhile, the BOPP film can be biodegraded in a short time after being used and discarded, the efficiency is high, and the application value is high in white pollution solving application;

(4) the high-efficiency composite catalyst can set the degradation time according to factors such as specific application, quality guarantee period of packing materials, storage conditions and the like, ensures that the performance of the catalyst does not change in the trial period, and starts degradation only within a period of time after the catalyst is used and discarded, thereby achieving good controllability;

(5) the high-efficiency composite catalyst can realize the biodegradation of the BOPP film due to small using amount, so the traditional production process is adopted, and the production process and the production processing mode are not required to be changed. Because the addition amount is also little, the cost is not increased much compared with the traditional BOPP film, thus being more beneficial to industrial production and large-scale popularization and application in use, and having higher use value and development and application prospect.

In conclusion, the high-efficiency composite catalyst for the biodegradable BOPP film, the preparation method and the application thereof can realize the biodegradation of the BOPP film material only under the open land environment condition, the degradation products are carbon dioxide, water and biomass, the generation of micro-plastics is avoided, and the problem of white pollution caused by the traditional BOPP film plastic is effectively solved.

It should be understood by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be used as a limitation of the present invention, and that changes and modifications to the above described embodiments are within the scope of the claims of the present invention as long as they are within the spirit and scope of the present invention.