CN113150509B - Bamboo powder/PBAT biodegradable material and preparation method thereof - Google Patents
Bamboo powder/PBAT biodegradable material and preparation method thereof Download PDFInfo
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
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Abstract
The invention relates to a bamboo powder/PBAT biodegradable material and a preparation method thereof, belonging to the technical field of high polymer material processing. The bamboo powder/PBAT biodegradable material is prepared by the following method: mixing the cleaned bamboo powder and a PBAT trichloromethane solution according to the mass ratio of 0.2-1:2-5 and uniformly dispersing to obtain a mixture A; mixing a surfactant and deionized water according to a mass ratio of 0.4-1: 50-80, and heating and stirring to obtain a transparent solution B; pouring the transparent solution B into the mixture A under the condition of high-speed stirring to obtain emulsion C; the high-speed stirring speed is 3000-5000 r/min, and the shearing time of the high-speed stirring is 5-6 min; removing the solvent from the emulsion C, cleaning and drying to obtain bamboo powder D after surface treatment; mixing bamboo powder D and PBAT according to the mass ratio of 10-50: mixing, extruding and granulating at a mass ratio of 50-90. The compatibility of the bamboo powder and the resin matrix is good, and the obtained PBAT-based composite material has excellent mechanical properties.
Description
Technical Field
The invention relates to a bamboo powder/PBAT biodegradable material and a preparation method thereof, belonging to the technical field of high polymer material processing.
Background
Since the invention, plastics have been used in large quantities in life. Brings great convenience to the public life, and the huge amount of non-degradable plastics causes serious pollution to the environment. According to the statistics of the society of plastic processing industry of China, in 2018, china produces 6042.15 ten thousand tons of plastic products cumulatively all the year round, the number of the plastic products cumulatively consumed all the year round exceeds 13314 ten thousand tons, 30% of the plastic products are about 4000 ten thousand tons of the plastic products and used for food packaging, disposable tableware, shopping bags and the like, about 1600 ten thousand tons of the plastic products of 40% of the plastic products finally become white pollution, great pressure is caused to the environment, the plastic products reach the stage of treatment, and the plastic products become the development trend of the plastic industry by replacing traditional plastics with biodegradable plastics.
PBAT is a copolymer of butylene adipate and butylene terephthalate, has better ductility and elongation at break as well as better heat resistance and impact property, is completely biodegradable as aliphatic polyester, and is one of the degradation materials which are very active in the research of the current biodegradable plastics and best in the market application. The biodegradable plastic can be divided into a bio-based biodegradable material and a petrochemical-based biodegradable material according to the source, wherein the PBAT belongs to the petrochemical-based biodegradable plastic and has abundant petroleum refining resources in China, and a petrochemical system also has abundant polyester production lines, so that the production of the PBAT has complete industrial production technical reserve and is suitable for large-scale industrial production.
The bamboo powder is a natural material obtained by drying and crushing bamboos, mainly comprises plant fibers, and has the advantages of light weight, large length-diameter ratio, high specific strength, large specific surface area, biodegradability and the like. Therefore, the bamboo powder and the biodegradable PBAT polyester are prepared into the novel composite material, the composite material not only keeps the characteristic of complete biodegradation, but also integrates a plurality of advantages of plant fibers and high polymer materials, the mechanical property of the matrix resin is improved, the application range of the composite material is expanded, the bamboo powder is converted into a product with high added value, the use of the traditional composite material is reduced, and the white pollution is reduced.
The patent application CN111548611A discloses a high-density bamboo powder/PBAT/polylactic acid biodegradable plastic and a preparation method thereof, groups on cellulose, PLA and PBAT macromolecular chains are activated under the catalysis of biological enzymes and then are crosslinked in a high-temperature melting state, the good flexibility and ductility of the PBAT molecular chain section are fully utilized to improve the toughness and the impact resistance of a composite material, and the prepared high-density bamboo powder/PBAT/polylactic acid biodegradable plastic is safe, environment-friendly and easy to degrade and has a wide application prospect, but the preparation method is complex, the preparation time is long, and the practical application is limited.
Xie Xiwei, weng Yunxuan, zhang Caili, etc. the effect of aluminate compatibilization modified bamboo powder on the performance of PBAT/BF composite material [ J ] chinese plastics, 2020,034 (004): 78-83. An article discloses a method for improving the interfacial compatibility with PBAT by using aluminate modified bamboo powder, which improves the surface hydrophobicity by physically or chemically modifying the surface of the bamboo powder; the process is simple, the cost is low, the elongation at break is greatly reduced after the bamboo powder is added, and the tensile strength and the impact strength are also reduced along with the increase of the addition amount of the bamboo powder.
Disclosure of Invention
The invention aims to provide a bamboo powder/PBAT biodegradable material.
In order to achieve the purpose, the bamboo powder/PBAT biodegradable material is prepared by the following method:
a. mixing the cleaned bamboo powder with a PBAT trichloromethane solution according to the mass ratio of 0.2-1:2-5 and uniformly dispersing to obtain a mixture A; mixing a surfactant and deionized water according to a mass ratio of 0.4-1: blending at the ratio of 50-80 to obtain a transparent solution B;
b. pouring the transparent solution B into the mixture A under the condition of high-speed stirring to obtain emulsion C; the high-speed stirring rotating speed is 3000-5000 r/min, and the shearing time of the high-speed stirring is 5-6 min;
c. removing the solvent from the emulsion C, cleaning and drying to obtain bamboo powder D after surface treatment;
d. mixing bamboo powder D and PBAT according to the mass ratio of 10-50: mixing, extruding and granulating by the mass ratio of 50-90 to obtain the bamboo powder/PBAT biodegradable material; the temperature of the extrusion is preferably 140 to 150 ℃.
In a specific embodiment, the particle size of the bamboo powder in the step a is 50-3000 meshes.
In a specific embodiment, the method for cleaning the bamboo powder in the step a comprises the following steps: mixing bamboo powder and deionized water in a mass ratio of 0.2-1: mixing the raw materials in a ratio of 20-40, stirring and carrying out ultrasonic treatment simultaneously, filtering, repeatedly washing for 2-3 times, and drying to obtain bamboo powder with the water content of 2-4%; the stirring speed of the cleaning process is 100-200 r/min; the ultrasonic time of the cleaning process is 40-60 min; the drying process is preferably drying for 24-30 h at 70-80 ℃.
In a specific embodiment, the mass ratio of the PBAT to the trichloromethane in the PBAT trichloromethane solution in the step a is 0.2-1:2-5; preferably, the PBAT trichloromethane solution is a transparent PBAT/trichloromethane solution obtained by mixing PBAT and trichloromethane, and then simultaneously stirring, ultrasonically treating and heating;
preferably, the stirring speed is 100-200 r/min; the ultrasonic treatment time is 40-50 min; the heating temperature is 40-45 ℃.
In a specific embodiment, the surfactant in step a is one or more of sodium dodecyl benzene sulfonate and sodium glycocholate.
In one embodiment, the method for removing the solvent in step c is distillation; and c, the cleaning in the step is that the distilled product and deionized water are mixed according to the mass ratio of 0.4-1: mixing the bamboo powder D and the bamboo powder D according to the proportion of 50-80, heating and stirring, filtering, repeatedly washing for 2-3 times, drying and removing water to obtain bamboo powder D after surface treatment;
the heating temperature is 70-85 ℃; preferably, the distillation temperature is 80-85 ℃; the stirring speed is 100-200 r/min.
The second purpose of the invention is to provide a preparation method of the bamboo powder/PBAT biodegradable material.
To achieve the second object of the present invention, the method comprises the steps of:
a. mixing the cleaned bamboo powder with a PBAT trichloromethane solution according to the mass ratio of 0.2-1:2-5 and uniformly dispersing to obtain a mixture A; mixing a surfactant and deionized water according to a mass ratio of 0.4-1: 50-80, heating and stirring to obtain a transparent solution B;
b. pouring the transparent solution B into the mixture A under the condition of high-speed stirring to obtain emulsion C; the high-speed stirring speed is 3000-5000 r/min, and the shearing time of the high-speed stirring is 5-6 min;
c. removing the solvent from the emulsion C, cleaning and drying to obtain bamboo powder D after surface treatment;
d. mixing bamboo powder D and PBAT according to the mass ratio of 10-50: mixing, extruding and granulating at a mass ratio of 50-90 to obtain the bamboo powder/PBAT biodegradable material; the extrusion temperature is preferably 140-150 ℃;
the surfactant in the step a is preferably one or more of sodium dodecyl benzene sulfonate and sodium glycocholate.
In a specific embodiment, the particle size of the bamboo powder in the step a is 50 to 3000 meshes.
In a specific embodiment, the method for cleaning bamboo powder in step a comprises the following steps: mixing bamboo powder and deionized water in a mass ratio of 0.2-1: mixing the raw materials in a ratio of 20-40, stirring and carrying out ultrasonic treatment simultaneously, filtering, repeatedly washing for 2-3 times, and drying to obtain bamboo powder with the water content of 2-4%;
the stirring speed of the cleaning process is 100-200 r/min; the ultrasonic time of the cleaning process is 40-60 min; the drying process is preferably drying for 24-30 h at 70-80 ℃.
In a specific embodiment, the mass ratio of the PBAT to the trichloromethane in the PBAT trichloromethane solution in the step a is 0.2-1:2-5; preferably, the PBAT trichloromethane solution is a transparent PBAT/trichloromethane solution obtained by mixing PBAT and trichloromethane, and then simultaneously stirring, ultrasonically treating and heating;
preferably, the stirring speed in the step a is 100-200 r/min; the ultrasonic treatment time is 40-50 min; the heating temperature is 40-45 ℃;
c, the solvent is removed by distillation; and c, the cleaning in the step is that the distilled product and deionized water are mixed according to the mass ratio of 0.4-1: mixing the bamboo powder D and the bamboo powder D according to the proportion of 50-80, heating and stirring, filtering, repeatedly washing for 2-3 times, drying and removing water to obtain bamboo powder D after surface treatment; preferably, the distillation temperature in the step c is 80-85 ℃; the heating temperature is 70-85 ℃; the stirring speed is 100-200 r/min.
Has the beneficial effects that:
the invention adopts bamboo powder fiber from the nature as the filler, and because the surface of the plant fiber contains a large amount of polar functional groups such as hydroxyl, phenolic hydroxyl and the like, the plant fiber has strong hydrophilicity and chemical polarity, the interface compatibility of the plant fiber and hydrophobic resin is extremely poor, and the reinforcing effect of the fiber on the resin is influenced.
Detailed Description
In order to achieve the purpose, the bamboo powder/PBAT biodegradable material is prepared by the following method:
a. mixing the cleaned bamboo powder with a PBAT trichloromethane solution according to the mass ratio of 0.2-1:2-5 and uniformly dispersing to obtain a mixture A; mixing a surfactant and deionized water according to a mass ratio of 0.4-1: 50-80, heating and stirring to obtain a transparent solution B;
b. pouring the transparent solution B into the mixture A under the condition of high-speed stirring to obtain emulsion C; the high-speed stirring rotating speed is 3000-5000 r/min, and the shearing time of the high-speed stirring is 5-6 min;
c. removing the solvent from the emulsion C, cleaning and drying to obtain bamboo powder D after surface treatment;
d. mixing bamboo powder D and PBAT according to the mass ratio of 10-50: mixing, extruding and granulating by the mass ratio of 50-90 to obtain the bamboo powder/PBAT biodegradable material; the temperature of the extrusion is preferably 140 to 150 ℃.
In a specific embodiment, the particle size of the bamboo powder in the step a is 50-3000 meshes.
In a specific embodiment, the method for cleaning bamboo powder in step a comprises the following steps: mixing bamboo powder and deionized water in a mass ratio of 0.2-1: mixing the raw materials in a ratio of 20-40, stirring and carrying out ultrasonic treatment simultaneously, filtering, repeatedly washing for 2-3 times, and drying to obtain bamboo powder with the water content of 2-4%; the stirring speed of the cleaning process is 100-200 r/min; the ultrasonic time of the cleaning process is 40-60 min; the drying process is preferably drying for 24-30 h at 70-80 ℃.
In a specific embodiment, the mass ratio of the PBAT to the trichloromethane in the PBAT trichloromethane solution in the step a is 0.2-1:2-5; preferably, the PBAT trichloromethane solution is a transparent PBAT/trichloromethane solution obtained by mixing PBAT and trichloromethane, and then simultaneously stirring, ultrasonically treating and heating;
preferably, the stirring speed is 100-200 r/min; the ultrasonic treatment time is 40-50 min; the heating temperature is 40-45 ℃.
In a specific embodiment, the surfactant in step a is one or more of sodium dodecyl benzene sulfonate and sodium glycocholate.
In one embodiment, the solvent removal method in step c is distillation; the cleaning in the step c is to mix the distilled product and deionized water according to the mass ratio of 0.4-1: mixing the bamboo powder D and the bamboo powder D according to the proportion of 50-80, heating and stirring, filtering, repeatedly washing for 2-3 times, drying and removing water to obtain bamboo powder D after surface treatment;
the heating temperature is 70-85 ℃; preferably, the distillation temperature is 80-85 ℃; the stirring speed is 100-200 r/min.
The second purpose of the invention is to provide a preparation method of the bamboo powder/PBAT biodegradable material.
To achieve the second object of the present invention, the method comprises the steps of:
a. mixing the cleaned bamboo powder with a PBAT trichloromethane solution according to the mass ratio of 0.2-1:2-5 and uniformly dispersing to obtain a mixture A; mixing a surfactant and deionized water according to a mass ratio of 0.4-1: 50-80, heating and stirring to obtain a transparent solution B;
b. pouring the transparent solution B into the mixture A under the condition of high-speed stirring to obtain emulsion C; the high-speed stirring rotating speed is 3000-5000 r/min, and the shearing time of the high-speed stirring is 5-6 min;
c. removing the solvent from the emulsion C, cleaning and drying to obtain bamboo powder D after surface treatment;
d. mixing bamboo powder D and PBAT according to the mass ratio of 10-50: mixing, extruding and granulating by the mass ratio of 50-90 to obtain the bamboo powder/PBAT biodegradable material; the extrusion temperature is preferably 140-150 ℃;
the surfactant in the step a is preferably one or more of sodium dodecyl benzene sulfonate and sodium glycocholate.
In a specific embodiment, the particle size of the bamboo powder in the step a is 50-3000 meshes.
In a specific embodiment, the method for cleaning the bamboo powder in the step a comprises the following steps: mixing bamboo powder and deionized water in a mass ratio of 0.2-1: mixing at a ratio of 20-40, stirring and performing ultrasonic treatment simultaneously, filtering, repeatedly washing for 2-3 times, and drying to obtain bamboo powder with the water content of 2-4%;
the stirring speed of the cleaning process is 100-200 r/min; the ultrasonic time of the cleaning process is 40-60 min; the drying process is preferably carried out at 70-80 ℃ for 24-30 h.
In a specific embodiment, the mass ratio of the PBAT to the trichloromethane in the PBAT trichloromethane solution in the step a is 0.2-1:2-5; preferably, the PBAT trichloromethane solution is a transparent PBAT/trichloromethane solution obtained by mixing PBAT and trichloromethane, and then simultaneously stirring, ultrasonically treating and heating;
preferably, the stirring speed in the step a is 100-200 r/min; the ultrasonic treatment time is 40-50 min; the heating temperature is 40-45 ℃;
c, the solvent is removed by distillation; and c, the cleaning in the step is that the distilled product and deionized water are mixed according to the mass ratio of 0.4-1: mixing the bamboo powder D and the bamboo powder D according to the proportion of 50-80, heating and stirring, filtering, repeatedly washing for 2-3 times, drying and removing water to obtain bamboo powder D after surface treatment; preferably, the distillation temperature in the step c is 80-85 ℃; the heating temperature is 70-85 ℃; the stirring speed is 100-200 r/min.
The following examples are provided to further illustrate the embodiments of the present invention and are not intended to limit the invention to the embodiments described.
Example 1
Step one, taking bamboo powder with the particle size of 200 meshes and deionized water according to the mass ratio of 1:40 under the condition of additional stirring, carrying out ultrasonic treatment for 50min at the stirring speed of 150 r/min, carrying out reduced pressure filtration after the time is up, repeating the operations twice to obtain cleaned bamboo powder, and placing the cleaned bamboo powder in a high-temperature oven for drying and dewatering at the temperature of 80 ℃ for 24h to obtain bamboo powder with the water content of about 3%;
step two, mixing PBAT and trichloromethane according to the mass ratio of 1:10 under the conditions of additional stirring and heating, wherein the ultrasonic treatment time is 50min, the stirring speed is 150 revolutions per minute, and the heating temperature is 45 ℃, so as to obtain a transparent PBAT/trichloromethane solution;
step three, taking the bamboo powder treated in the step one and the PBAT/chloroform solution according to the mass ratio of 1:10 under the condition of additional stirring, carrying out ultrasonic treatment for 50min at a stirring speed of 200 rpm to obtain a mixture;
step four, mixing sodium dodecyl benzene sulfonate and deionized water according to a mass ratio of 1:80 to obtain a transparent solution, pouring the transparent solution into a high-speed stirrer, slowly pouring the mixture obtained in the step three under high-speed stirring, wherein the stirring speed is 5000 r/min, and the shearing time is 5min to obtain an emulsion;
and step five, distilling the emulsion obtained in the step four to remove the solvent, wherein the distillation temperature is 80 ℃, and the obtained dry product and deionized water are mixed according to the mass ratio of 1:40, heating and stirring at the heating temperature of 80 ℃ and the stirring speed of 150 rpm, filtering under reduced pressure, repeatedly washing for 2-3 times, and drying in an oven at the temperature of 85 ℃ for 24 hours to obtain the bamboo powder with the surface coated.
Taking the prepared surface treatment bamboo powder and PBAT according to the mass ratio of 10-30: and (3) extruding and granulating according to the proportion of 70-90, wherein the formula table is shown in table 1, the extrusion temperature is 140 ℃, the bamboo powder/PBAT biodegradable material can be obtained, the bamboo powder/PBAT biodegradable material is subjected to injection molding by an injection molding machine to form a standard sample strip, and the obtained sample is subjected to mechanical tensile property test according to the national standard.
Example 2
The formulation table is shown in table 1 except for the addition amount of the surface-coated bamboo powder, and the other conditions are the same as those of example 1.
Example 3
The formulation table is shown in table 1 except for the amount of the surface-coated bamboo powder added, and the conditions are the same as those of example 1.
Comparative example 1
Taking the cleaned bamboo powder without surface treatment and PBAT according to the mass ratio of 10-30: and (3) extruding and granulating according to the proportion of 70-90, wherein the formula table is shown in table 2, the extrusion temperature is 140 ℃, the obtained product is subjected to injection molding by an injection molding machine to form a standard sample strip, and the obtained sample is subjected to mechanical tensile property test according to the national standard.
Comparative example 2
Except for the different addition of bamboo powder, the other conditions are the same as the comparative example 1.
Comparative example 3
Except for the different addition of bamboo powder, the other conditions are the same as the comparative example 1.
TABLE 1 formulation proportions (parts by mass) of Experimental examples 1 to 3
| Formulation of | Experimental example 1 | Experimental example 2 | Experimental example 3 |
| Surface-coated bamboo powder | 10 | 20 | 30 |
| PBAT | 90 | 80 | 70 |
TABLE 2 formulation proportions (parts by mass) of comparative examples 1 to 3
| Formulation of | Comparative example 1 | Comparative example 2 | Comparative example 3 |
| Bamboo powder | 10 | 20 | 30 |
| PBAT | 90 | 80 | 70 |
The performance tests show that the performance parameters of the composite materials prepared in experimental examples 1-3 and comparative examples 1-3 are listed in Table 3.
TABLE 3 Properties of composites prepared in Experimental examples 1-3 and comparative examples 1-3
As can be seen from table 3, the PBAT reinforcement effect is significantly improved when the bamboo powder is subjected to surface coating treatment, and in experimental example 3, the tensile strength can reach 21.2MPa, and the elongation at break thereof is still 375%. Compared with the traditional method of adding the compatilizer, the implementation method is simple, other additives are not needed, the mechanical property is greatly improved, and the tensile strength of the modified bamboo powder is increased by 16.7 percent compared with that of pure bamboo powder under the condition of adding 20 parts of the compatilizer.
Claims (18)
1. The bamboo powder/PBAT biodegradable material is characterized by being prepared by the following method:
a. mixing the cleaned bamboo powder with a PBAT trichloromethane solution according to the mass ratio of 0.2-1:2-5 and uniformly dispersing to obtain a mixture A; mixing a surfactant and deionized water according to a mass ratio of 0.4-1: blending in the proportion of 50-80 to obtain a transparent solution B, wherein the mass ratio of the PBAT to the trichloromethane in the PBAT trichloromethane solution in the step a is 0.2-1:2-5;
b. pouring the transparent solution B into the mixture A under the condition of high-speed stirring to obtain emulsion C; the high-speed stirring rotating speed is 3000-5000 r/min, and the shearing time of the high-speed stirring is 5-6 min;
c. removing the solvent from the emulsion C, cleaning and drying to obtain bamboo powder D after surface treatment;
d. mixing bamboo powder D and PBAT according to the mass ratio of 10-50: mixing, extruding and granulating by the mass ratio of 50-90 to obtain the bamboo powder/PBAT biodegradable material; the extrusion temperature is 140-150 ℃.
2. The bamboo powder/PBAT biodegradable material as claimed in claim 1, wherein the particle size of the bamboo powder in step a is 50-3000 mesh.
3. The bamboo powder/PBAT biodegradable material as claimed in claim 1 or 2, wherein the cleaning method of the bamboo powder in step a is: mixing bamboo powder and deionized water according to the mass ratio of 0.2-1: mixing the raw materials in a ratio of 20-40, stirring and carrying out ultrasonic treatment simultaneously, filtering, repeatedly washing for 2-3 times, and drying to obtain bamboo powder with the water content of 2-4%; the stirring speed of the cleaning process is 100-200 r/min; the ultrasonic time of the cleaning process is 40-60 min.
4. The bamboo powder/PBAT biodegradable material according to claim 3, characterized in that the drying process is drying at 70-80 ℃ for 24-30 h.
5. The bamboo powder/PBAT biodegradable material according to claim 1 or 2, wherein the PBAT chloroform solution in the step a is a transparent PBAT chloroform solution obtained by mixing PBAT and chloroform, and then simultaneously stirring, ultrasonic processing and heating.
6. The bamboo powder/PBAT biodegradable material as claimed in claim 5, wherein the stirring speed is 100-200 rpm; the ultrasonic treatment time is 40-50 min; the heating temperature is 40-45 ℃.
7. The bamboo powder/PBAT biodegradable material of claim 1 or 2, wherein the surfactant in step a is one or more of sodium dodecyl benzene sulfonate and sodium glycocholate.
8. The bamboo powder/PBAT biodegradable material according to claim 1 or 2, characterized in that the method of removing the solvent in step c is distillation; and c, the cleaning in the step is that the distilled product and deionized water are mixed according to the mass ratio of 0.4-1: mixing the bamboo powder D and the bamboo powder D according to the proportion of 50-80, heating and stirring, filtering, repeatedly washing for 2-3 times, drying and removing water to obtain bamboo powder D after surface treatment;
the heating temperature is 70-85 ℃.
9. The bamboo powder/PBAT biodegradable material according to claim 8, wherein the temperature of the distillation is 80-85 ℃; the stirring speed is 100-200 r/min.
10. The method for preparing bamboo powder/PBAT biodegradable material according to any of claims 1 to 9, characterized in that it comprises the following steps:
a. mixing the cleaned bamboo powder with a PBAT trichloromethane solution according to the mass ratio of 0.2-1:2-5 and uniformly dispersing to obtain a mixture A; mixing a surfactant and deionized water according to a mass ratio of 0.4-1: 50-80, heating and stirring to obtain a transparent solution B;
b. pouring the transparent solution B into the mixture A under the condition of high-speed stirring to obtain emulsion C; the high-speed stirring rotating speed is 3000-5000 r/min, and the shearing time of the high-speed stirring is 5-6 min;
c. removing the solvent from the emulsion C, cleaning and drying to obtain bamboo powder D after surface treatment;
d. mixing bamboo powder D and PBAT according to the mass ratio of 10-50: mixing, extruding and granulating by the mass ratio of 50-90 to obtain the bamboo powder/PBAT biodegradable material; the extrusion temperature is 140-150 ℃.
11. The method for preparing bamboo powder/PBAT biodegradable material as claimed in claim 10, wherein the surfactant in step a is one or more of sodium dodecyl benzene sulfonate and sodium glycocholate.
12. The method for preparing bamboo powder/PBAT biodegradable material as claimed in claim 10, wherein the particle size of the bamboo powder in step a is 50-3000 mesh.
13. The method for preparing bamboo powder/PBAT biodegradable material according to claim 10, wherein the method for cleaning the bamboo powder in the step a comprises the following steps: mixing bamboo powder and deionized water according to the mass ratio of 0.2-1: mixing the raw materials in a ratio of 20-40, stirring and carrying out ultrasonic treatment simultaneously, filtering, repeatedly washing for 2-3 times, and drying to obtain bamboo powder with the water content of 2-4%;
the stirring speed of the cleaning process is 100-200 r/min; the ultrasonic time of the cleaning process is 40-60 min.
14. The preparation method of bamboo powder/PBAT biodegradable material as claimed in claim 13, wherein the drying process is drying at 70-80 ℃ for 24-30 h.
15. The method for preparing bamboo powder/PBAT biodegradable material according to claim 10, wherein the weight ratio of PBAT to chloroform in the PBAT chloroform solution in the step a is 0.2-1:2-5;
c, the solvent is removed by distillation; and c, the cleaning in the step is that the distilled product and deionized water are mixed according to the mass ratio of 0.4-1: mixing the raw materials according to the proportion of 50-80, heating and stirring, filtering, repeatedly washing for 2-3 times, drying and removing water to obtain the bamboo powder D after surface treatment.
16. The method for preparing bamboo powder/PBAT biodegradable material according to claim 15, wherein the PBAT chloroform solution is a transparent PBAT chloroform solution obtained by mixing PBAT and chloroform, and then simultaneously stirring, ultrasonic processing and heating.
17. The method for preparing bamboo powder/PBAT biodegradable material according to claim 15, wherein the stirring speed in the step a is 100-200 r/min; the ultrasonic treatment time is 40-50 min; the heating temperature is 40-45 ℃.
18. The method for preparing bamboo powder/PBAT biodegradable material according to claim 15, wherein the temperature of the distillation in the step c is 80-85 ℃; the heating temperature is 70-85 ℃; the stirring speed is 100-200 r/min.
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| CN115536993A (en) * | 2022-08-31 | 2022-12-30 | 杭州明日新材料科技有限公司 | High-barrier bionic nano composite full-biodegradable film and preparation method thereof |
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