Biodegradable light conversion film and preparation method thereof

Abstract

The invention relates to a biodegradable light conversion film and a preparation method thereof.The preparation method of the biodegradable light conversion film comprises the following steps that an ultraviolet absorbent, a lubricant, an anti-blocking agent, an antioxidant, an ultraviolet reflecting agent, filler, a light conversion agent and degradable resin are mixed, and the biodegradable light conversion film is prepared through tape casting and extrusion film blowing; the light conversion agent is prepared by mixing a waste polyester raw material and modified halloysite and then sintering the mixture in an oxygen-free environment, and the modified halloysite is prepared by modifying calcined halloysite with (3-aminopropyl) triethoxysilane. The biodegradable film has the light conversion characteristic, can emit red light, blue light and green light at the same time, and can effectively prevent and control insect pests and promote crop growth.

Description

Technical Field

[0001] The present application relates to the field of material technology, and in particular to a biodegradable light-conversion film and a preparation method thereof. Background Art

[0002] Membrane materials are widely used in many fields such as food and drug packaging, fruit and vegetable preservation, membrane separation, etc. Among them, the most widely used membrane materials are petroleum-based plastics (such as olefin materials). These membrane materials have unique and excellent comprehensive properties, large output, low price, and high degree of industrialization. However, the degradation process of these membrane materials is slow, and it takes about 100-200 years or even longer to be decomposed. Finding new green and environmentally friendly materials to replace traditional membrane materials has become a major challenge facing the plastics industry.

[0003] To solve the above problems, people have developed biodegradable films. Biodegradable films are membrane materials that can be at least partially decomposed by microorganisms such as bacteria and fungi under certain conditions, such as polylactic acid membrane materials. However, traditional biodegradable films only have biodegradation effects and cannot meet the needs of green pest control for crops and warming in cold regions. Summary of the invention

[0004] In view of the above-mentioned shortcomings of the prior art, the present invention provides a biodegradable light conversion film and a preparation method thereof to meet the needs of green pest control of crops and warming in cold areas.

[0005] To achieve the above objectives, the scheme of this application is as follows:

[0006] In a first aspect, the present invention provides a method for preparing a biodegradable light-conversion film, comprising the following steps:

[0007] Mixing ultraviolet absorber, lubricant, opening agent, antioxidant, ultraviolet reflector, filler, light conversion agent and degradable resin, and preparing the biodegradable light conversion film by casting, extrusion and film blowing;

[0008] The light conversion agent is prepared by mixing waste polyester raw materials with modified halloysite and sintering them in an oxygen-free environment. The modified halloysite is prepared by calcining halloysite and modifying it with (3-aminopropyl)triethoxysilane.

[0009] Optionally, in step S3, the ultraviolet absorber is selected from at least one of a benzophenone ultraviolet absorber, a benzotriazole ultraviolet absorber and a triazine ultraviolet absorber.

[0010] Optionally, the benzophenone ultraviolet absorber is selected from at least one of benzophenones (2-hydroxy-4-n-octyloxybenzophenone, 2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2,4-dihydroxybenzophenone, 2-hydroxy-4-dodecyloxybenzophenone, 2-hydroxy-4-benzyloxybenzophenone, 2,2',4,4'-tetrahydroxybenzophenone and methylenebis(trihydroxybenzophenone)).

[0011] Optionally, the benzotriazole ultraviolet absorber is selected from at least one of 2-(2'-hydroxy-5'-methylphenyl)benzotriazole, 2-(2-hydroxy-3-tert-butyl-5-methylphenyl)-5-chlorobenzotriazole and 2-(2'-hydroxy-3',5'-di-tert-butylphenyl)-5-chlorobenzotriazole.

[0012] Optionally, the triazine ultraviolet absorber includes optionally, the ethylhexyl triazone.

[0013] Optionally, the lubricant is selected from at least one of calcium stearate, zinc stearate, paraffin and monoglyceride of fatty acid.

[0014] Optionally, the opening agent is selected from at least one of silicon dioxide, erucamide and oleamide.

[0015] Optionally, the antioxidant is selected from at least one of tris(2,4-di-tert-butylphenyl) phosphite, pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate, β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate and 2,2'-methylenebis-(4-methyl-6-tert-butylphenol), preferably tris(2,4-di-tert-butylphenyl) phosphite or pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate or a combination thereof.

[0016] Optionally, the filler is selected from at least one of calcium carbonate, talc, silicon dioxide, hydrotalcite, montmorillonite and kaolinite.

[0017] Optionally, the ultraviolet reflector is selected from at least one of titanium dioxide, zinc oxide, titanium dioxide, iron oxide, talc, kaolinite, vermiculite, pyrophyllite, tourmaline and hematite.

[0018] Optionally, the mass ratio of the ultraviolet absorber, the lubricant, the opening agent, the antioxidant, the ultraviolet reflector, the filler, the light conversion agent and the degradable resin is 0.5-5: 0.5-2: 0.5-1.5: 0.2-1.5: 1-15: 5-35: 5-35: 100.

[0019] Optionally, during the casting process, the body temperature is 120-208°C, preferably 140-180°C, the head temperature is 140-180°C, preferably 150-180°C, the lip opening is 1.5-2.5mm, the main engine speed is 20-30rpm, preferably 22-28rpm; the three-roll speed is 6.0-8.0m / min; the traction speed is 4-6m / min, the middle roller water temperature is 20-30°C, preferably 23-28°C; the gap between the air knife and the roller is 1.0-3.0mm.

[0020] In the present application, during the extrusion film blowing process, the body temperature is 90-208°C, the melt temperature is 140-180°C, the main machine speed is 10-60rpm, and the traction speed is 2.5-10m / min.

[0021] In a second aspect, the present application also provides a biodegradable light conversion film prepared according to the method described above.

[0022] Beneficial effects of the present invention:

[0023] The biodegradable light-conversion film made of a specific formula in this application can emit red light, blue light, and green light at the same time, which can effectively prevent and control pests and promote crop growth. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a diagram showing the light conversion property test results of the biodegradable light conversion film prepared in Example 1;

[0025] Figure 2 The figure is an insect repellent effect diagram (eggplant), and No. 1-4 represents Examples 1-4, the same below;

[0026] Figure 3 is the number of leaves in the life test experiment (tobacco);

[0027] Figure 4 is the maximum leaf length in the life test experiment (tobacco);

[0028] Figure 5 The maximum leaf width in the life test (tobacco). DETAILED DESCRIPTION

[0029] The following will describe the embodiments of the present invention with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for illustrating the present invention, not for limiting the scope of protection of the present invention.

[0030] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and thus the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0031] The biodegradable light-conversion film of the present application has light-conversion properties and can emit red light, blue light, and green light at the same time. The traditional light-conversion film is a single-color light-conversion film. The film of the present application has the following advantages:

[0032] It has an insect repellent effect: some insect pests are sensitive to blue light and red light. The carbon material in this application has polychromaticity, so it can emit red light and blue light at the same time. The combination of red and blue light has a wider insect repellent and insect repellent effect, effectively realizing green prevention and control.

[0033] Blue light is attractive to insects: The wavelength of blue light is usually between 450-495 nanometers, and insect vision is very sensitive to light in this band. Many pests, such as aphids, leafminers, mites, etc., have a strong tendency to blue light. Therefore, the use of blue light trapping equipment can effectively capture these pests and reduce the number of pests in the field.

[0034] Blue light interferes with insect behavior: Blue light can interfere with the feeding, mating and egg-laying behaviors of some pests. Studies have shown that blue light may affect the circadian rhythm of pests, reduce the frequency of pest activity, and thus reduce the damage of pests to crops. The types of pests controlled by blue light include but are not limited to: aphids, leaf miners, mites, and thrips.

[0035] The pest repellent effect of red light: The wavelength of red light is between 620-750 nanometers. Some pests (such as whiteflies and certain beetles) are photophobic to red light. This repellent effect can reduce the time that pests stay on crops and reduce the damage to crops.

[0036] The impact of red light on insect development: Studies have shown that red light can affect the development process of pests, especially red light under photoperiod regulation, which can inhibit the hatching and growth rate of certain pest larvae, reduce the production of adults, and thus reduce the risk of pests. The types of pests controlled by red light include but are not limited to: whiteflies, leafhoppers, and beetles.

[0037] Combined use of blue light and red light: Combination of trapping and repelling: Blue light and red light can be used in agricultural production at the same time, blue light is used to trap pests, and red light is used to repel pests. This combination can play an effective prevention and control role in the life cycle of different pests. Spectral screening technology: Through specific wavelengths of blue light and red light, different types of pests can be targeted and controlled to minimize damage to crops, while reducing dependence on chemical pesticides and reducing environmental pollution.

[0038] The effect of red light on crop growth: The wavelength of red light is usually 620-750 nanometers. It is one of the main driving forces of photosynthesis and plays an important role in the physiological processes of plants such as germination, stem and leaf growth, flowering and fruiting.

[0039] Promote photosynthesis: Red light is one of the most effective lights absorbed by plants, which helps stimulate chlorophyll in photosynthesis, enables plants to produce energy, promotes the accumulation of carbohydrates, and thus supports the overall growth of plants.

[0040] Regulating plant morphology: Red light regulates plant morphology through the plant's photosensitive pigment system (such as phytochrome), mainly affecting the flowering and germination of plants. Plants exposed to red light for a long time tend to show elongation growth, especially stem elongation.

[0041] Promotes flowering and fruiting:

[0042] Red light can accelerate the flowering of plants, especially long-day plants. Under the irradiation of red light, the flowering time of plants is advanced, the quality of flowers is improved, and the yield and quality of fruits are also improved accordingly.

[0043] Promote seed germination: Red light can activate the photosensitive pigments in plant seeds, break the dormancy of seeds, and promote seed germination. This is very critical for the early planting process.

[0044] The effect of blue light on crop growth: The wavelength of blue light is 450-495 nanometers, which usually has a profound effect on plant photosynthesis, stomatal opening and closing, leaf morphology and color, etc.

[0045] Regulating the photomorphogenesis of plants: Blue light regulates the growth morphology of plants through light receptors (such as cryptochrome). Blue light can inhibit excessive elongation of stems, make plants more compact, and help enhance the overall structural strength of plants.

[0046] Promote leaf growth and stomatal opening and closing: Blue light helps leaf growth and increases leaf thickness and color concentration. It also promotes the opening and closing of stomata, helping plants to better exchange gases (such as absorbing carbon dioxide) and transpire water, thereby improving photosynthesis efficiency.

[0047] Enhance photosynthesis efficiency:

[0048] Although blue light is slightly weaker than red light in driving photosynthesis, it plays an important role in the formation of chloroplasts and the efficiency of plant carbon dioxide absorption, especially through the process of stomatal regulation.

[0049] Regulating plant defense mechanisms: Blue light is also involved in regulating plant defense responses, such as stimulating plants to produce certain secondary metabolites, such as anthocyanins and flavonoids. These substances not only help to resist oxidation, but also enhance the plant's resistance to environmental stress (such as ultraviolet rays, diseases, etc.).

[0050] Combination of red light and blue light:

[0051] Enhancement of photosynthesis:

[0052] The combination of red light and blue light can maximize photosynthesis. Red light is the main energy source for photosynthesis, while blue light improves the efficiency of photosynthesis by regulating the opening and closing of stomata and the production of chlorophyll. Therefore, the combination of red light and blue light can better promote the growth, development and yield of crops.

[0053] Promotes overall plant development:

[0054] The balance of red and blue light is crucial to controlling the morphology of plants. For example, the right amount of red light promotes plant elongation, while blue light makes the plants more compact and strong. Therefore, in greenhouse cultivation and artificial light cultivation, it is crucial to adjust the ratio of red and blue light to achieve the best plant growth effect.

[0055] Improve the quality of crops:

[0056] The combined use of red and blue light can not only increase the growth rate of plants, but also improve the quality of crops, such as increasing the chlorophyll content of leafy vegetables and improving the sugar content and flavor of fruits.

[0057] In summary, red light can promote photosynthesis, plant flowering and fruiting, seed germination, and control the growth cycle and morphological construction of plants;

[0058] Blue light can regulate the opening and closing of stomata, enhance leaf growth, inhibit excessive elongation, and improve the photosynthesis efficiency and resistance of plants. The combined use of the two can better promote the overall growth and development of plants. Especially in modern agriculture, artificial light sources are often used to provide an appropriate ratio of red and blue light to increase crop yield and quality.

[0059] In the following description, numerous details are discussed to provide a more thorough explanation of embodiments of the present invention; however, it is apparent to one skilled in the art that embodiments of the present invention may be practiced without these specific details.

[0060] Example 1

[0061] A method for preparing a biodegradable light-conversion film, the specific steps are as follows:

[0062] S1. Mix 7 mL of APTES and 200 mL of anhydrous ethanol to obtain an ethanol solution;

[0063] 10 g of commercially available calcined halloysite was added to the ethanol solution, followed by stirring (stirring at 75° C.), filtering, and drying to obtain modified halloysite;

[0064] S2. Mixing waste polyester raw materials (a mixture of PCL, PET, and PBAT in a mass ratio of 1:1:1) and modified halloysite, wherein the mass ratio of the waste polyester raw materials to the modified halloysite is 100:3, placing the resulting mixture in a tubular furnace, heating it to 700° C. in a nitrogen gas flow rate of 20 mL / min, and sintering it at 700° C. for 2 h to obtain a light conversion agent;

[0065] S3. 2-hydroxy-4-benzyloxybenzophenone, calcium stearate, silicon dioxide, tris(2,4-di-tert-butylphenyl) phosphite, titanium dioxide, calcium carbonate, a light-converting agent, and a fully biodegradable resin (composed of PBAT and PLA in a mass ratio of 80:20) are mixed in a mass ratio of 2:1:1:1:10:10:5:100, and then cast and extruded and blown films are performed in sequence to obtain a biodegradable light-converting film;

[0066] During the casting process, the machine body temperature was 172°C, the head temperature was 175°C, the lip opening was 2.0mm, the main machine speed was 26rpm, the three-roller speed was 7.0m / min; the traction speed was 5.4m / min, the middle roller water temperature was 25.8°C, and the gap between the air knife and the roller was 2.0mm;

[0067] During the extrusion film blowing process, the body temperature was 151°C, the melt temperature was 175°C, the main machine speed was 30rpm, and the traction speed was 7.5m / min.

[0068] Example 2

[0069] A method for preparing a biodegradable light-conversion film, the specific steps are as follows:

[0070] S1. Mix 9 mL of APTES and 200 mL of anhydrous ethanol to obtain an ethanol solution;

[0071] 10 g of commercially available calcined halloysite was added to the ethanol solution, followed by stirring (stirring at 85° C.), filtering, and drying to obtain modified halloysite;

[0072] S2. Mixing waste polyester raw materials (a mixture of PLA, PET, and PBAT in a mass ratio of 1:1:1) and modified halloysite, wherein the mass ratio of the waste polyester raw materials to the modified halloysite is 100:4, placing the resulting mixture in a tubular furnace, heating it to 850° C. in nitrogen at a flow rate of 5 mL / min, and sintering it at 850° C. for 1.5 h to obtain a light conversion agent;

[0073] S3. 2-(2-hydroxy-3-tert-butyl-5-methylphenyl)-5-chlorobenzotriazole, paraffin, erucamide, pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], zinc oxide, talc, a light-converting agent and a fully biodegradable resin (composed of PBAT and PPC in a mass ratio of 90:10) were mixed in a mass ratio of 0.5:2:1.5:0.2:1:35:35:100, and then cast and extruded and blown films were performed in sequence to obtain a biodegradable light-converting film;

[0074] During the casting process, the machine body temperature was 172°C, the head temperature was 175°C, the lip opening was 2.0mm, the main machine speed was 26rpm, the three-roller speed was 7.0m / min; the traction speed was 5.4m / min, the middle roller water temperature was 25.8°C, and the gap between the air knife and the roller was 2.0mm;

[0075] During the extrusion film blowing process, the machine body temperature was 150°C, the melt temperature was 180°C, the main machine speed was 10rpm, and the traction speed was 10m / min.

[0076] Example 3

[0077] A method for preparing a biodegradable light-conversion film, the specific steps are as follows:

[0078] S1. Mix 6 mL of APTES and 200 mL of anhydrous ethanol to obtain an ethanol solution;

[0079] 10 g of commercially available calcined halloysite was added to the ethanol solution, followed by stirring (stirring at 60° C.), filtering, and drying to obtain modified halloysite;

[0080] S2. Mixing waste polyester raw materials (a mixture of PBT, PET, PLA, and PBAT in a mass ratio of 1:1::1:1) and modified halloysite, wherein the mass ratio of the waste polyester raw materials to the modified halloysite is 100:2, placing the resulting mixture in a tubular furnace, heating it to 650° C. in a nitrogen gas flow rate of 15 mL / min, and sintering it at 650° C. for 2.5 h to obtain a light conversion agent;

[0081] S3. Ethylhexyl triazone, monoglyceride, oleic acid amide, pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate], zinc oxide, silicon dioxide, a light-converting agent, and a biodegradable resin (composed of PBAT and PPC in a mass ratio of 80:20) were mixed in a mass ratio of 5:0.5:0.5:1.5:15:5:100, and then cast and extruded and blown films were performed in sequence to obtain a biodegradable light-converting film;

[0082] During the casting process, the machine body temperature was 172°C, the head temperature was 175°C, the lip opening was 2.0mm, the main machine speed was 26rpm, the three-roller speed was 7.0m / min; the traction speed was 5.4m / min, the middle roller water temperature was 25.8°C, and the gap between the air knife and the roller was 2.0mm;

[0083] During the extrusion film blowing process, the body temperature was 152°C, the melt temperature was 140°C, the main machine speed was 60rpm, and the traction speed was 2.5m / min.

[0084] Example 4

[0085] A method for preparing a biodegradable light-conversion film, the specific steps are as follows:

[0086] S1. Mix 5 mL of APTES and 200 mL of anhydrous ethanol to obtain an ethanol solution;

[0087] 10 g of commercially available calcined halloysite was added to the ethanol solution, followed by stirring (stirring at 65° C.), filtering, and drying to obtain modified halloysite;

[0088] S2. Mixing waste polyester raw materials (a mixture of PET, PBAT, and PCL in a mass ratio of 1:1:1) and modified halloysite, wherein the mass ratio of the waste polyester raw materials to the modified halloysite is 100:3.5, placing the resulting mixture in a tubular furnace, heating it to 710° C. in a nitrogen gas flow rate of 25 mL / min, and sintering it at 710° C. for 2.5 h to obtain a light conversion agent;

[0089] S3. 2'-(2'-hydroxy-3'-tert-butyl-5'-methylphenyl)-5-chlorobenzotriazole, zinc stearate, silicon dioxide, β-(3,5-di-tert-butyl-4-hydroxyphenyl) propionate (antioxidant 1076), iron oxide, montmorillonite powder, a light-converting agent and a fully biodegradable resin (composed of PBAT and PBS in a mass ratio of 85:15) were mixed in a mass ratio of 2:1.5:1.0:0.8:6:20:100, and then cast and extruded and blown films were performed in sequence to obtain a biodegradable light-converting film;

[0090] During the casting process, the machine body temperature was 174°C, the head temperature was 175°C, the lip opening was 2.0mm, the main machine speed was 26rpm, the three-roller speed was 7.0m / min; the traction speed was 5.4m / min, the middle roller water temperature was 25.8°C, and the gap between the air knife and the roller was 2.0mm;

[0091] During the extrusion film blowing process, the body temperature was 151°C, the melt temperature was 165°C, the main machine speed was 40rpm, and the traction speed was 6m / min.

[0092] Comparative Example 1

[0093] The difference between this comparative example and Example 1 is that ordinary carbon is used to replace the light conversion agent.

[0094] Comparative Example 2

[0095] The difference between this comparative example and Example 1 is:

[0096] S2. The waste polyester raw material (specifically PET / PBAT here) and calcined halloysite (the source is the same as in Example 1) are mixed in a mass ratio of 100:5, and then placed in a tubular furnace, and sintered at 800°C for 2 hours in a nitrogen atmosphere (flow rate of 20 mL / min) to obtain a light conversion agent.

[0097] That is, the calcined halloysite was not modified in this comparative example.

[0098] Comparative Example 3

[0099] Ordinary polyethylene film.

[0100] Comparative Example 4

[0101] The difference between this comparative example and Example 1 is:

[0102] S3. 2-hydroxy-4-benzyloxybenzophenone, calcium stearate, silicon dioxide, tris(2,4-di-tert-butylphenyl) phosphite, titanium dioxide and calcium carbonate, and a fully biodegradable resin (composed of PBAT and PLA in a mass ratio of 80:20) are mixed in a mass ratio of 2:1:1:1:10:10, and then cast and extruded and blown films are performed in sequence to obtain a film.

[0103] That is, no light conversion agent was added during the film preparation process of this comparative example.

[0104] Performance Testing

[0105] The thickness, strength (i.e., tensile strength), toughness (i.e., elongation at break), and water vapor permeability of the films prepared in Examples 1-4 and Comparative Examples 1-3 were tested, and the results are shown in Table 1.

[0106] Among them, the thickness was tested using a CHY-CU film thickness gauge;

[0107] Strength and tenacity (i.e. tensile strength) and toughness (i.e. elongation at break) were tested using a ground film tensile testing machine;

[0108] The water vapor transmission rate was tested using the cup weighing method.

[0109] Table 1 Membrane performance test results

[0110]

[0111] It can be seen from Table 1 that the strength of the films of Examples 1 to 4 is significantly increased compared with Comparative Examples 1 to 3. This result shows that the light conversion film of the present application has excellent mechanical properties.

[0112] The light conversion characteristics of the biodegradable film prepared in Example 1 were tested, specifically: the three-dimensional luminescence characteristics of the film were tested using a laser confocal microscope. The results are as follows: Figure 1 shown.

[0113] Depend on Figure 1 It can be seen that the biodegradable film of the present application can emit red light, blue light and green light under the excitation of 400-700nm wavelength, which proves that the biodegradable film of the present application has the characteristics of red light, blue light and green light conversion.

[0114] The membranes of Examples 1-4 and Comparative Example 4 (i.e., control) were tested for life span, and the results are shown in Table 2.

[0115] The specific steps of life testing are: conducting field planting experiments and making life statistics based on the cracks in the membrane.

[0116] Table 2 Life test results

[0117] Test items Example 1 Example 2 Example 3 Example 4 Comparative Example 4 Lifespan (days) 75 68 120 110 34

[0118] Field application experiments were conducted on tobacco, eggplant and other crops using Examples 1-4 and Comparative Example 4 (i.e., control). The specific steps were as follows: a randomized block design was adopted, with Examples 1-4 and Comparative Example 4, a total of 5 treatments, repeated 3 times, and a row spacing of 110 cm × 50 cm. Other cultivation and management measures were implemented according to local high-quality tobacco and vegetable production technologies. The results are as follows Figures 2 to 5 As shown, Figure 2 This is a disease statistics chart (eggplant).

[0119] Depend on Figure 2 It can be seen that, compared with Comparative Example 4, Examples 1-4 reduce the disease index. This proves that the biodegradable film of the present application has good insect repellent performance.

[0120] Depend on Figure 3-5(Tobacco) It can be seen that compared with Comparative Example 4, Examples 1-4 increase the number and area of ​​leaves. This proves that the biodegradable light conversion film of the present application promotes crop growth.

[0121] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by a person of ordinary skill in the art without departing from the spirit and technical ideas disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A method for preparing a biodegradable light-conversion film, characterized in that: The following steps are involved: Mixing ultraviolet absorber, lubricant, opening agent, antioxidant, ultraviolet reflector, filler, light conversion agent and degradable resin, and preparing the biodegradable light conversion film by casting, extrusion and film blowing; The light conversion agent is prepared by mixing waste polyester raw materials with modified halloysite and sintering them in an oxygen-free environment. The modified halloysite is prepared by calcining halloysite and modifying it with (3-aminopropyl)triethoxysilane.

2. The preparation method according to claim 1, characterized in that The ultraviolet absorber is selected from at least one of benzophenone ultraviolet absorbers, benzotriazole ultraviolet absorbers and triazine ultraviolet absorbers.

3. The preparation method according to claim 2, characterized in that: The benzophenone ultraviolet absorber is selected from at least one of benzophenones (2-hydroxy-4-n-octyloxybenzophenone, 2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2,4-dihydroxybenzophenone, 2-hydroxy-4-dodecyloxybenzophenone, 2-hydroxy-4-benzyloxybenzophenone, 2,2',4,4'-tetrahydroxybenzophenone, and methylenebis(trihydroxybenzophenone)).

4. The preparation method according to claim 2, characterized in that: The triazine ultraviolet absorber is selected from ethylhexyl triazone.

5. The preparation method according to claim 1, characterized in that: The lubricant is selected from at least one of calcium stearate, zinc stearate, paraffin and monoglyceride of fatty acid.

6. The preparation method according to claim 1, characterized in that: The opening agent is selected from at least one of silicon dioxide, erucamide and oleamide.

7. The preparation method according to claim 1, characterized in that: The filler is selected from at least one of calcium carbonate, talc, silicon dioxide, hydrotalcite, montmorillonite and kaolinite.

8. The preparation method according to claim 1, characterized in that: The ultraviolet reflector is selected from at least one of titanium dioxide, zinc oxide, titanium dioxide, iron oxide, talc, kaolinite, vermiculite, pyrophyllite, tourmaline and hematite.

9. The preparation method according to claim 1, characterized in that: The mass ratio of the ultraviolet absorber, the lubricant, the opening agent, the antioxidant, the ultraviolet reflector, the filler, the light conversion agent and the degradable resin is 0.5-5: 0.5-2: 0.5-1.5: 0.2-1.5: 1-15: 5-35: 5-35:

100.

10. The biodegradable light conversion film prepared according to the method according to any one of claims 1 to 9.

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