Bamboo fiber ecological environment-friendly mulching film and preparation method thereof
By combining modified bamboo fibers and polylactic acid and other materials, bamboo fiber ecological and environmentally friendly plastic films with high temperature stability and aging resistance are prepared, which solves the problem of soil and environment pollution by traditional plastic plastic films and realizes the application of degradable and environmentally friendly plastic films.
Patent Information
- Application Number
- CN202510090414.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-21
- Publication Date
- 2025-04-11
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
Traditional non-degradable plastic mulch remains in the soil for a long time and is difficult to decompose, resulting in soil structure damage, affecting the growth of crop roots, reducing yield and quality. At the same time, the treatment of waste mulch has also become an environmental problem.
Bamboo fiber ecological and environmentally friendly plastic film is prepared by modifying bamboo fibers, polylactic acid, coupling agents, plasticizers, antioxidants and heat stabilizers. Bamboo fibers are modified through alkali pretreatment, sulfonation, end-aminolation and grafting steps to improve its compatibility and performance.
The prepared bamboo fiber ecological and environmentally friendly plastic film has good high temperature stability, aging resistance, and is a degradable material. It is suitable for industrial wide production and application, and solves the problem of soil and environment pollution by traditional plastic film.
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Figure BDA0005251347700000091
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of fiber membranes, and in particular to an ecological and environmentally friendly bamboo fiber mulch film and a preparation method thereof. Background Art
[0002] Traditional mulch films are widely used in agricultural production and can effectively increase ground temperature, maintain soil moisture, and inhibit weed growth. However, traditional mulch films are mostly made of non-degradable plastic materials, which remain in the soil for a long time and are difficult to decompose, leading to the destruction of soil structure, affecting soil aeration and water permeability, hindering the growth of crop roots, and thus reducing crop yield and quality. In addition, the disposal of waste mulch films has also become an environmental problem. Incineration will produce harmful gases and pollute the atmospheric environment. Therefore, the research and development of degradable and environmentally friendly ecological mulch films is imminent. At present, some mulch films based on natural materials have a certain degree of degradability, but they are insufficient in strength, weather resistance, etc., and cannot fully meet the needs of agricultural production. Summary of the invention
[0003] 1. Technical issues to be resolved
[0004] In view of the deficiencies in the prior art, the present invention provides a bamboo fiber ecological and environmentally friendly mulch film and a preparation method thereof.
[0005] (II) Technical solution
[0006] A bamboo fiber ecological and environmentally friendly mulch film, composed of the following raw materials in parts by weight:
[0007] 20-40 parts of modified bamboo fiber, 30-60 parts of polylactic acid, 1-5 parts of coupling agent, 5-8 parts of plasticizer, 1-3 parts of antioxidant, 1-3 parts of heat stabilizer;
[0008] The modified bamboo fiber preparation method is as follows:
[0009] S1, cutting and crushing the bamboo, removing the colloid, bleaching, soaking in a sodium hydroxide solution with a mass fraction of 3-5%, treating at 60-80° C. for 1-3 hours, rinsing with deionized water until neutral and drying, to obtain pretreated bamboo fiber;
[0010] S2, adding the pretreated bamboo fiber into a reaction kettle, and then sequentially adding sodium sulfite, sodium hydroxide, anthraquinone, and deionized water, reacting in an oil bath at 150-180° C. for 3-6 hours, washing to neutrality after cooling, and drying to obtain sulfonated bamboo fiber;
[0011] S3, sulfonated bamboo fiber, p-aminophenol, anhydrous potassium carbonate, and N-methylpyrrolidone are mixed, stirred evenly, anhydrous toluene is added, nitrogen is passed, stirred, heated and refluxed for 15 to 30 hours, cooled to room temperature, washed with ethanol and deionized water, and dried to obtain amino-terminated sulfonated bamboo fiber;
[0012] S4. Add (3,5-dibromopyridin-4-yl)methanol into water, heat it to 50-60°C, stir it evenly, add amino-terminated sulfonated bamboo fiber and initiator ammonium persulfate, heat it to 80-100°C, stir it for 3-6 hours, and remove the solvent by distillation under reduced pressure to obtain modified bamboo fiber.
[0013] Preferably, in step S2, the mass ratio of the pretreated bamboo fiber, sodium sulfite, sodium hydroxide, anthraquinone and deionized water is 1:2-3:0.2-0.4:0.03-0.06:40-60.
[0014] Preferably, in step S3, the mass ratio of sulfonated bamboo fiber, p-aminophenol, anhydrous potassium carbonate, N-methylpyrrolidone and anhydrous toluene is 1:0.05-0.12:0.1-0.3:8-16:4-6.
[0015] Preferably, in step S4, the mass ratio of the terminal aminosulfonated bamboo fiber, (3,5-dibromopyridin-4-yl)methanol, and the initiator ammonium persulfate is 1:0.2-0.5:0.05-0.08.
[0016] Preferably, the coupling agent is KH-550.
[0017] Preferably, the plasticizer is one of DOP, DIDP, DOA, ED3, and TOP.
[0018] Preferably, the antioxidant is one of 1010, 1076 and DLTP.
[0019] Preferably, the heat stabilizer is one of calcium stearate and dibutyltin dilaurate.
[0020] Preferably, the preparation method is as follows:
[0021] Add modified bamboo fiber and polylactic acid into a hot mixer, heat up to 90-110°C, add a coupling agent, stir at 50-100r / min for 10-30min, add a plasticizer, an antioxidant, and a heat stabilizer, heat up to 110-120°C, stir at 150-200r / min for 10-30min, cool to 40-50°C, put into a twin-screw extruder for extrusion, cool, and pelletize to obtain a masterbatch; blow the masterbatch into a film through a film blowing machine to obtain a bamboo fiber ecological and environmentally friendly mulch film.
[0022] (III) Beneficial technical effects
[0023] A bamboo fiber ecological and environmental protection mulch film is composed of the following raw materials in parts by weight: 20 to 40 parts of modified bamboo fiber, 30 to 60 parts of polylactic acid, 1 to 5 parts of coupling agent, 5 to 8 parts of plasticizer, 1 to 3 parts of antioxidant, and 1 to 3 parts of heat stabilizer.
[0024] The modified bamboo fiber is first subjected to alkali pretreatment, then sulfonated, terminally amino-terminated, and grafted to obtain the modified bamboo fiber. After modification, the bamboo fiber can improve the compatibility of the bamboo fiber with other materials, and the obtained film is more uniform, while effectively improving the stability, weather resistance, and strength.
[0025] The environmentally friendly bamboo fiber mulch film of the present invention has good high-temperature stability and aging resistance, is a degradable material, has a green and environmentally friendly production process, and is suitable for wide industrial production and application. DETAILED DESCRIPTION
[0026] Example 1
[0027] The preparation method of modified bamboo fiber is as follows:
[0028] S1. Cut and crush the bamboo into sections, remove the colloid, bleach it, soak it in a 3% sodium hydroxide solution by mass, treat it at 60° C. for 1 hour, rinse it with deionized water until it is neutral, and dry it to obtain pretreated bamboo fiber.
[0029] S2. Add 10 kg of pretreated bamboo fiber into a reactor, and then add 20 kg of sodium sulfite, 2 kg of sodium hydroxide, 0.3 kg of anthraquinone, and 400 L of deionized water in sequence, react in an oil bath at 150° C. for 3 h, wash to neutrality after cooling, and dry to obtain sulfonated bamboo fiber.
[0030] S3. 8 kg of sulfonated bamboo fiber, 0.4 kg of p-aminophenol, 0.8 kg of anhydrous potassium carbonate and 64 kg of N-methylpyrrolidone were mixed and stirred evenly, 32 kg of anhydrous toluene was added, nitrogen was passed through, stirring and heating refluxed for 15 h, cooled to room temperature, washed with ethanol and deionized water, and dried to obtain amino-terminated sulfonated bamboo fiber.
[0031] S4. Add 1 kg (3,5-dibromopyridin-4-yl) methanol into water, heat to 50°C, stir evenly, add 5 kg terminal amino sulfonated bamboo fiber and 0.25 kg initiator ammonium persulfate, heat to 80°C, stir to react for 3 hours, and remove the solvent by vacuum distillation to obtain modified bamboo fiber.
[0032] The preparation method of bamboo fiber ecological and environmentally friendly mulch film is as follows:
[0033] Add 2kg modified bamboo fiber and 3kg polylactic acid into a hot mixer, heat to 90°C, add 0.1kg coupling agent KH-550, stir at 50r / min for 10min, add 0.5kg plasticizer DOP, 0.1kg antioxidant 1010, 0.1kg heat stabilizer calcium stearate, heat to 110°C, stir at 150r / min for 10min, cool to 40°C, put into a twin-screw extruder for extrusion, cool, and pelletize to obtain masterbatch; the masterbatch is blown into film by a film blowing machine to obtain a bamboo fiber ecological and environmentally friendly mulch film.
[0034] Example 2
[0035] The preparation method of modified bamboo fiber is as follows:
[0036] S1. Cut and crush the bamboo into sections, remove the colloid, bleach it, soak it in a 5% sodium hydroxide solution by mass, treat it at 80° C. for 3 hours, rinse it with deionized water until it is neutral, and dry it to obtain pretreated bamboo fiber.
[0037] S2. Add 10 kg of pretreated bamboo fiber into a reactor, and then add 30 kg of sodium sulfite, 4 kg of sodium hydroxide, 0.6 kg of anthraquinone, and 600 L of deionized water in sequence, react in an oil bath at 180° C. for 6 hours, wash to neutrality after cooling, and dry to obtain sulfonated bamboo fiber.
[0038] S3. 8 kg of sulfonated bamboo fiber, 0.96 kg of p-aminophenol, 2.4 kg of anhydrous potassium carbonate and 128 kg of N-methylpyrrolidone were mixed and stirred evenly, 48 kg of anhydrous toluene was added, nitrogen was passed through, stirring and heating refluxed for 30 h, cooled to room temperature, washed with ethanol and deionized water, and dried to obtain amino-terminated sulfonated bamboo fiber.
[0039] S4. Add 2.5 kg (3,5-dibromopyridin-4-yl) methanol into water, heat to 60°C, stir evenly, add 5 kg terminal amino sulfonated bamboo fiber and 0.4 kg initiator ammonium persulfate, heat to 100°C, stir to react for 6 hours, and remove the solvent by reduced pressure distillation to obtain modified bamboo fiber.
[0040] The preparation method of bamboo fiber ecological and environmentally friendly mulch film is as follows:
[0041] Add 4kg of modified bamboo fiber and 6kg of polylactic acid into a hot mixer, heat to 110°C, add 0.5kg of coupling agent KH-550, stir at 100r / min for 30min, add 0.8kg of plasticizer DIDP, 0.3kg of antioxidant 1076, and 0.3kg of heat stabilizer dibutyltin dilaurate, heat to 120°C, stir at 200r / min for 30min, cool to 50°C, put into a twin-screw extruder for extrusion, cool, and pelletize to obtain masterbatch; the masterbatch is blown into film by a film blowing machine to obtain a bamboo fiber ecological and environmentally friendly mulch film.
[0042] Example 3
[0043] The preparation method of modified bamboo fiber is as follows:
[0044] S1. Cut and crush the bamboo into sections, remove the colloid, bleach it, soak it in a sodium hydroxide solution with a mass fraction of 4%, treat it at 70° C. for 2 hours, rinse it with deionized water until it is neutral, and dry it to obtain pretreated bamboo fiber.
[0045] S2. Add 10 kg of pretreated bamboo fiber into a reactor, and then add 22 kg of sodium sulfite, 2.5 kg of sodium hydroxide, 0.4 kg of anthraquinone, and 500 L of deionized water in sequence, react in an oil bath at 160° C. for 5 hours, wash to neutrality after cooling, and dry to obtain sulfonated bamboo fiber.
[0046] S3. 8 kg of sulfonated bamboo fiber, 0.5 kg of p-aminophenol, 1 kg of anhydrous potassium carbonate and 80 kg of N-methylpyrrolidone were mixed and stirred evenly, 35 kg of anhydrous toluene was added, nitrogen was passed through, stirring and heating refluxed for 20 h, cooled to room temperature, washed with ethanol and deionized water, and dried to obtain amino-terminated sulfonated bamboo fiber.
[0047] S4. Add 1.5 kg (3,5-dibromopyridin-4-yl) methanol into water, heat to 55°C, stir evenly, add 5 kg terminal amino sulfonated bamboo fiber and 0.3 kg initiator ammonium persulfate, heat to 90°C, stir to react for 3 to 6 hours, and remove the solvent by reduced pressure distillation to obtain modified bamboo fiber.
[0048] The preparation method of bamboo fiber ecological and environmentally friendly mulch film is as follows:
[0049] Add 2.2kg modified bamboo fiber and 3.4kg polylactic acid into a hot mixer, heat to 100°C, add 0.4kg coupling agent KH-550, stir at 80r / min for 20min, add 0.6kg plasticizer DOA, 0.2kg antioxidant DLTP, 0.2kg heat stabilizer calcium stearate, heat to 120°C, stir at 180r / min for 30min, cool to 50°C, put into a twin-screw extruder for extrusion, cool, and pelletize to obtain masterbatch; the masterbatch is blown into film by a film blowing machine to obtain a bamboo fiber ecological and environmentally friendly mulch film.
[0050] Example 4
[0051] The preparation method of modified bamboo fiber is as follows:
[0052] S1. Cut and crush the bamboo into sections, remove the colloid, bleach it, soak it in a 5% by mass sodium hydroxide solution, treat it at 80° C. for 1 hour, rinse it with deionized water until it is neutral, and dry it to obtain pretreated bamboo fiber.
[0053] S2. Add 10 kg of pretreated bamboo fiber into a reactor, and then add 26 kg of sodium sulfite, 3.3 kg of sodium hydroxide, 0.5 kg of anthraquinone, and 480 L of deionized water in sequence, react in an oil bath at 160° C. for 5 hours, wash to neutrality after cooling, and dry to obtain sulfonated bamboo fiber.
[0054] S3. 8 kg of sulfonated bamboo fiber, 0.6 kg of p-aminophenol, 1.2 kg of anhydrous potassium carbonate and 90 kg of N-methylpyrrolidone were mixed and stirred evenly, 40 kg of anhydrous toluene was added, nitrogen was passed through, stirring and heating refluxed for 30 h, cooled to room temperature, washed with ethanol and deionized water, and dried to obtain amino-terminated sulfonated bamboo fiber.
[0055] S4. Add 1.8 kg (3,5-dibromopyridin-4-yl) methanol into water, heat to 50°C, stir evenly, add 5 kg terminal amino sulfonated bamboo fiber and 0.35 kg initiator ammonium persulfate, heat to 100°C, stir to react for 3 hours, and remove the solvent by reduced pressure distillation to obtain modified bamboo fiber.
[0056] The preparation method of bamboo fiber ecological and environmentally friendly mulch film is as follows:
[0057] Add 3kg modified bamboo fiber and 4kg polylactic acid into a hot mixer, heat to 110°C, add 0.3kg coupling agent KH-550, stir at 90r / min for 30min, add 0.7kg plasticizer ED3, 0.1kg antioxidant 1010, 0.3kg heat stabilizer calcium stearate, heat to 120°C, stir at 200r / min for 10min, cool to 40°C, put into a twin-screw extruder for extrusion, cool, and pelletize to obtain masterbatch; the masterbatch is blown into film by a film blowing machine to obtain a bamboo fiber ecological and environmentally friendly mulch film.
[0058] Example 5
[0059] The preparation method of modified bamboo fiber is as follows:
[0060] S1. Cut and crush the bamboo into sections, remove the colloid, bleach it, soak it in a 3% sodium hydroxide solution by mass, treat it at 80° C. for 1 hour, rinse it with deionized water until it is neutral, and dry it to obtain pretreated bamboo fiber.
[0061] S2. Add 10 kg of pretreated bamboo fiber into a reactor, and then add 30 kg of sodium sulfite, 3.6 kg of sodium hydroxide, 0.5 kg of anthraquinone, and 520 L of deionized water in sequence, react in an oil bath at 150° C. for 6 hours, wash to neutrality after cooling, and dry to obtain sulfonated bamboo fiber.
[0062] S3. 8 kg of sulfonated bamboo fiber, 0.8 kg of p-aminophenol, 2 kg of anhydrous potassium carbonate and 100 kg of N-methylpyrrolidone were mixed and stirred evenly, 40 kg of anhydrous toluene was added, nitrogen was passed through, stirring and heating and refluxed for 25 h, cooled to room temperature, washed with ethanol and deionized water, and dried to obtain amino-terminated sulfonated bamboo fiber.
[0063] S4. Add 2.2 kg (3,5-dibromopyridin-4-yl) methanol into water, heat to 60°C, stir evenly, add 5 kg terminal amino sulfonated bamboo fiber and 0.32 kg initiator ammonium persulfate, heat to 100°C, stir to react for 5 hours, and remove the solvent by reduced pressure distillation to obtain modified bamboo fiber.
[0064] The preparation method of bamboo fiber ecological and environmentally friendly mulch film is as follows:
[0065] Add 4kg modified bamboo fiber and 4.5kg polylactic acid into a hot mixer, heat to 100°C, add 0.3kg coupling agent KH-550, stir at 100r / min for 20min, add 0.6kg plasticizer TOP, 0.3kg antioxidant 1010, 0.1kg heat stabilizer calcium stearate, heat to 120°C, stir at 200r / min for 30min, cool to 50°C and put into a twin-screw extruder for extrusion, cool and pelletize to obtain masterbatch; the masterbatch is blown into film by a film blowing machine to obtain a bamboo fiber ecological and environmentally friendly mulch film.
[0066] Comparative Example 1
[0067] The preparation method of modified bamboo fiber is as follows:
[0068] S1. Cut and crush the bamboo into sections, remove the colloid, bleach it, soak it in a 3% sodium hydroxide solution by mass, treat it at 60° C. for 1 hour, rinse it with deionized water until it is neutral, and dry it to obtain pretreated bamboo fiber.
[0069] S2. Add 10 kg of pretreated bamboo fiber into a reactor, and then add 20 kg of sodium sulfite, 2 kg of sodium hydroxide, 0.3 kg of anthraquinone, and 400 L of deionized water in sequence, react in an oil bath at 150° C. for 3 h, wash to neutrality after cooling, and dry to obtain sulfonated bamboo fiber.
[0070] S3. 8 kg of sulfonated bamboo fiber, 0.4 kg of p-aminophenol, 0.8 kg of anhydrous potassium carbonate and 64 kg of N-methylpyrrolidone were mixed and stirred evenly, 32 kg of anhydrous toluene was added, nitrogen was passed through, stirring and heating refluxed for 15 h, cooled to room temperature, washed with ethanol and deionized water, and dried to obtain amino-terminated sulfonated bamboo fiber.
[0071] S4. Add 1 kg (3,5-dibromopyridin-4-yl) methanol into water, heat to 50°C, stir evenly, add 5 kg terminal amino sulfonated bamboo fiber and 0.25 kg initiator ammonium persulfate, heat to 80°C, stir to react for 3 hours, and remove the solvent by vacuum distillation to obtain modified bamboo fiber.
[0072] The preparation method of bamboo fiber ecological and environmentally friendly mulch film is as follows:
[0073] 2kg modified bamboo fiber and 3kg polylactic acid were added into a hot mixer, the temperature was raised to 90°C, 0.1kg coupling agent KH-550 was added, and the mixture was stirred at 50r / min for 10min. 0.5kg plasticizer DOP was added, the temperature was raised to 110°C, and the mixture was stirred at 150r / min for 10min. The mixture was cooled to 40°C and put into a twin-screw extruder for extrusion. The mixture was cooled and pelletized to obtain master batches. The master batches were blown into films by a film blowing machine to obtain bamboo fiber ecological and environmentally friendly mulch film.
[0074] Comparative Example 2
[0075] The bamboo was cut into sections and crushed, the colloid was removed, bleached, soaked in a 3% sodium hydroxide solution at 60°C for 1 hour, rinsed with deionized water until neutral, and dried to obtain pretreated bamboo fiber.
[0076] The preparation method of bamboo fiber ecological and environmentally friendly mulch film is as follows:
[0077] 2kg pretreated bamboo fiber and 3kg polylactic acid were added into a hot mixer, the temperature was raised to 90°C, 0.1kg coupling agent KH-550 was added, and the mixture was stirred at 50r / min for 10min. 0.5kg plasticizer DOP was added, the temperature was raised to 110°C, and the mixture was stirred at 150r / min for 10min. The mixture was cooled to 40°C and put into a twin-screw extruder for extrusion. The mixture was cooled and pelletized to obtain master batches. The master batches were blown into films by a film blowing machine to obtain bamboo fiber ecological and environmentally friendly mulch film.
[0078] Performance Testing:
[0079] Examples 1 to 5 and comparative examples 1 to 2 were subjected to high temperature stability and aging resistance tests, the test sample size was 100×100 mm, and the results are shown in Table 1;
[0080] Measure the thermal shrinkage and thermal expansion coefficient at 260℃ for high temperature stability;
[0081] The aging resistance test refers to GB / T 1040.1-2018, and an electronic universal mechanical testing machine is used to detect the tensile strength at a rate of 5 mm / min; it is placed in 100°C hot air for aging for 96 hours, the tensile strength is tested again, and the tensile strength retention rate is calculated.
[0082] Table 1
[0083]
[0084]
[0085] It can be seen from Table 1 that the environmentally friendly mulch films prepared in Examples 1 to 5 have good high-temperature stability and aging resistance. The mulch film of Comparative Example 2 has worse high-temperature stability and aging resistance than that of Comparative Example 1. It can be seen that the modified bamboo fiber can effectively improve the high-temperature stability and aging resistance of the mulch film.
[0086] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A bamboo fiber ecological and environmentally friendly mulch film, characterized in that: It is composed of the following raw materials in parts by weight: 20-40 parts of modified bamboo fiber, 30-60 parts of polylactic acid, 1-5 parts of coupling agent, 5-8 parts of plasticizer, 1-3 parts of antioxidant, 1-3 parts of heat stabilizer; The modified bamboo fiber preparation method is as follows: S1, cutting and crushing the bamboo, removing the colloid, bleaching, soaking in a sodium hydroxide solution with a mass fraction of 3-5%, treating at 60-80° C. for 1-3 hours, rinsing with deionized water until neutral and drying, to obtain pretreated bamboo fiber; S2, adding the pretreated bamboo fiber into a reaction kettle, and then sequentially adding sodium sulfite, sodium hydroxide, anthraquinone, and deionized water, reacting in an oil bath at 150-180° C. for 3-6 hours, washing to neutrality after cooling, and drying to obtain sulfonated bamboo fiber; S3, sulfonated bamboo fiber, p-aminophenol, anhydrous potassium carbonate, and N-methylpyrrolidone are mixed, stirred evenly, anhydrous toluene is added, nitrogen is passed, stirred, heated and refluxed for 15 to 30 hours, cooled to room temperature, washed with ethanol and deionized water, and dried to obtain amino-terminated sulfonated bamboo fiber; S4. Add (3,5-dibromopyridin-4-yl)methanol into water, heat it to 50-60°C, stir it evenly, add amino-terminated sulfonated bamboo fiber and initiator ammonium persulfate, heat it to 80-100°C, stir it for 3-6 hours, and remove the solvent by distillation under reduced pressure to obtain modified bamboo fiber.
2. The ecological and environmentally friendly bamboo fiber mulch film according to claim 1, characterized in that: In the step S2, the mass ratio of the pretreated bamboo fiber, sodium sulfite, sodium hydroxide, anthraquinone and deionized water is 1:2-3:0.2-0.4:0.03-0.06:40-60.
3. The ecological and environmentally friendly bamboo fiber mulch film according to claim 1, characterized in that: In the step S3, the mass ratio of sulfonated bamboo fiber, p-aminophenol, anhydrous potassium carbonate, N-methylpyrrolidone and anhydrous toluene is 1:0.05-0.12:0.1-0.3:8-16:4-6.
4. The ecological and environmentally friendly bamboo fiber mulch film according to claim 1, characterized in that: In the step S4, the mass ratio of the terminal amino sulfonated bamboo fiber, (3,5-dibromopyridin-4-yl)methanol, and the initiator ammonium persulfate is 1:0.2-0.5:0.05-0.
08.
5. The ecological and environmentally friendly bamboo fiber mulch film according to claim 1, characterized in that: The coupling agent is KH-550.
6. The ecological and environmentally friendly bamboo fiber mulch film according to claim 1, characterized in that: The plasticizer is one of DOP, DIDP, DOA, ED3 and TOP.
7. The ecological and environmentally friendly bamboo fiber mulch film according to claim 1, characterized in that: The antioxidant is one of 1010, 1076 and DLTP.
8. The ecological and environmentally friendly bamboo fiber mulch film according to claim 1, characterized in that: The heat stabilizer is one of calcium stearate and dibutyltin dilaurate.
9. A bamboo fiber ecological and environmentally friendly mulch film as claimed in claims 1 to 8, characterized in that: The preparation method is as follows: Add modified bamboo fiber and polylactic acid into a hot mixer, heat up to 90-110°C, add a coupling agent, stir at 50-100r / min for 10-30min, add a plasticizer, an antioxidant, and a heat stabilizer, heat up to 110-120°C, stir at 150-200r / min for 10-30min, cool to 40-50°C, put into a twin-screw extruder for extrusion, cool, and pelletize to obtain a masterbatch; blow the masterbatch into a film through a film blowing machine to obtain a bamboo fiber ecological and environmentally friendly mulch film.