Disclosure of Invention
The invention aims to provide a degradable bagasse mulching film which can solve the problem of complex pulping process of fiber-containing biomass such as bagasse and the like, can directly form a film of the biomass such as the bagasse and the like in a solid form, and has simple method and strong applicability. And because the bagasse ultrafine powder is added, the bagasse mulching film has better performance.
The invention also aims to provide a preparation method of the degradable bagasse mulching film, which solves the problem of complex pulping process of fiber-containing biomass such as bagasse and the like, can promote the combination of bagasse ultrafine powder and gelatinized tapioca starch through ultrasonic treatment, and can disperse the mixed solution more uniformly and eliminate bubbles.
The technical problem to be solved by the invention is realized by adopting the following technical scheme.
The invention provides a preparation method of a degradable bagasse mulching film, which comprises the following steps:
dissolving 4-6 parts by weight of cassava starch in 88-92 parts by weight of water, and stirring at 88-92 ℃ to gelatinize the cassava starch;
after the cassava starch is gelatinized, adding bagasse ultrafine powder in 0.5-2.5 parts by weight, and stirring;
after the bagasse ultrafine powder is fully stirred, adding 2-4 parts by weight of glycerol and 0.4-0.6 part by weight of sodium alginate, and stirring at the temperature of 78-82 ℃ to dissolve the glycerol and the sodium alginate;
after the glycerol and the sodium alginate are fully dissolved, carrying out ultrasonic treatment for 40-50min to obtain colloidal fluid;
the colloid liquid is processed into the degradable bagasse mulching film.
In one embodiment of the present invention, the method comprises:
dissolving 5 parts of cassava starch in 90 parts of water according to parts by weight, and stirring at the temperature of 90 ℃ to gelatinize the cassava starch;
after the cassava starch is gelatinized, adding bagasse ultrafine powder in 0.5-2.5 parts by weight, and stirring;
after the bagasse ultrafine powder is fully stirred, adding 3 parts by weight of glycerol and 0.5 part by weight of sodium alginate, and stirring at the temperature of 80 ℃ to dissolve the glycerol and the sodium alginate;
after the glycerol and the sodium alginate are fully dissolved, carrying out ultrasonic treatment for 45min to obtain a colloidal fluid;
the colloid liquid is processed into the degradable bagasse mulching film.
In one embodiment of the invention, the method for processing the colloid liquid into the degradable bagasse mulch film comprises the following steps:
injecting the colloidal fluid into a prefabricated mold, standing for 1.5-2.5h at room temperature to ensure that the colloidal fluid is spread flatly and has stable form;
and drying the prefabricated mould filled with the colloidal fluid at the temperature of 48-52 ℃.
In one embodiment of the invention, the method for processing the colloid liquid into the degradable bagasse mulch film comprises the following steps:
injecting the colloidal fluid into a prefabricated mold, standing for 2h at room temperature to ensure that the colloidal fluid is spread flatly and has stable form;
and drying the prefabricated mould filled with the colloidal fluid at the temperature of 50 ℃.
In one embodiment of the invention, the method for producing bagasse ultrafine powder comprises the following steps:
crushing bagasse;
mixing 1 part of pulverized bagasse and 28-32 parts of water according to the parts by weight, and stirring at the temperature of 88-92 ℃ for 1.3-1.7 h;
drying the mixed solution of the bagasse and water at 48-52 ℃;
and (4) pulverizing the dried bagasse.
In one embodiment of the invention, the method for producing bagasse ultrafine powder comprises the following steps:
crushing bagasse;
mixing 1 part of crushed bagasse and 30 parts of water according to the parts by weight, and stirring at the temperature of 90 ℃ for 1.5 hours;
drying the mixed solution of the bagasse and water at 50 ℃;
and (4) pulverizing the dried bagasse.
In one embodiment of the invention, the powdering process comprises:
crushing the dried bagasse into bagasse coarse powder;
crushing bagasse coarse powder in a vibration mill for 15-25 min.
In one embodiment of the invention, the bagasse coarse powder crushing method comprises the following steps:
and putting the dried bagasse into a high-speed universal pulverizer to be pulverized for 14-16s, and repeating for 2-4 times, wherein the time interval between every two adjacent times is 0.9-1.1 min.
In one embodiment of the invention, the powdering process comprises:
putting the dried bagasse into a high-speed universal pulverizer to pulverize for 15s, and repeating for 3 times, wherein the time interval between every two adjacent times is 1min, so as to obtain bagasse coarse powder;
crushing bagasse coarse powder in a vibration mill for 20 min.
The invention provides a degradable bagasse mulch film, which is prepared by the preparation method of the degradable bagasse mulch film.
The preparation method of the degradable bagasse mulching film provided by the embodiment of the invention has the beneficial effects that: the bagasse ultrafine powder and the gelatinized cassava starch are mixed, glycerol and sodium alginate are added, ultrasonic treatment is carried out, and then colloid liquid capable of preparing the mulching film is prepared, wherein the gelatinized cassava starch is used as a flow-carrying phase, the bagasse ultrafine powder is uniformly distributed in the cassava starch with cohesiveness, and the bagasse mulching film prepared from the obtained colloid liquid has high structural strength, so that direct utilization of bagasse can be realized, and wide utilization of biomass resources is promoted.
The degradable bagasse mulching film provided by the embodiment of the invention has the beneficial effects that: has degradable performance and high structural strength, can realize the direct utilization of bagasse and promote the wide utilization of biomass resources.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
The preparation method of the degradable bagasse mulching film of the embodiment of the invention is specifically described below.
The preparation method of the degradable bagasse mulching film comprises the following steps:
dissolving 4-6 parts by weight of cassava starch in 88-92 parts by weight of water, and stirring at 88-92 ℃ to gelatinize the cassava starch;
after the cassava starch is gelatinized, adding bagasse ultrafine powder in 0.5-2.5 parts by weight, and stirring;
after the bagasse ultrafine powder is fully stirred, adding 2-4 parts by weight of glycerol and 0.4-0.6 part by weight of sodium alginate, and stirring at the temperature of 78-82 ℃ to dissolve the glycerol and the sodium alginate;
after the glycerol and the sodium alginate are fully dissolved, carrying out ultrasonic treatment for 40-50min to obtain colloidal fluid;
the colloid liquid is processed into the degradable bagasse mulching film.
The bagasse ultrafine powder is stirred with the gelatinized cassava starch in an ultrasonic treatment mode, so that the bagasse ultrafine powder is fully mixed in the gelatinized cassava starch, and the prepared colloidal fluid can be made into a mulching film with better structural strength, thereby directly utilizing the bagasse and promoting the wide utilization of biomass resources.
Ultrasonic treatment is primarily the use of its power characteristics and cavitation to alter or accelerate changes in certain physical, chemical, biological characteristics or states of matter.
The bagasse ultra-fine powder can be fully and uniformly dispersed in the gelatinized cassava starch by ultrasonic treatment, so that the structural strength of the prepared degradable bagasse mulching film is higher.
Specifically, the ultrasonic treatment is performed by using a commercially available ultrasonic generator, and the specific structure thereof is the prior art and is not described herein again.
Further, comprising:
dissolving 5 parts of cassava starch in 90 parts of water according to parts by weight, and stirring at the temperature of 90 ℃ to gelatinize the cassava starch;
after the cassava starch is gelatinized, adding bagasse ultrafine powder in 0.5-2.5 parts by weight, and stirring;
after the bagasse ultrafine powder is fully stirred, adding 3 parts by weight of glycerol and 0.5 part by weight of sodium alginate, and stirring at the temperature of 80 ℃ to dissolve the glycerol and the sodium alginate;
after the glycerol and the sodium alginate are fully dissolved, carrying out ultrasonic treatment for 45min to obtain a colloidal fluid;
the colloid liquid is processed into the degradable bagasse mulching film.
Further, the method for processing the colloid liquid into the degradable bagasse mulching film comprises the following steps:
injecting the colloidal fluid into a prefabricated mold, standing for 1.5-2.5h at room temperature to ensure that the colloidal fluid is spread flatly and has stable form;
and drying the prefabricated mould filled with the colloidal fluid at the temperature of 48-52 ℃.
And injecting the colloid liquid into a prefabricated mold, wherein the dynamic balance of the combination among all molecules in the colloid liquid can be realized after 1.5-2.5h, and the drying time is shorter under the condition that the prepared mulching film has higher structural strength at the temperature of 48-52 ℃.
Further, the method for processing the colloid liquid into the degradable bagasse mulch film comprises the following steps:
injecting the colloidal fluid into a prefabricated mold, standing for 2h at room temperature to ensure that the colloidal fluid is spread flatly and has stable form;
and drying the prefabricated mould filled with the colloidal fluid at the temperature of 50 ℃.
Further, the production method of the bagasse ultrafine powder comprises the following steps:
crushing bagasse;
mixing 1 part of pulverized bagasse and 28-32 parts of water according to the parts by weight, and stirring at the temperature of 88-92 ℃ for 1.3-1.7 h;
drying the mixed solution of the bagasse and water at 48-52 ℃;
and (4) pulverizing the dried bagasse.
The bagasse is stirred in water at the temperature of 88-92 ℃ for 1.3-1.7h, so that the water-soluble part in the bagasse can be fully dissolved, and the substances such as dust, sugar, pectin and the like in the bagasse can be effectively removed.
After removing substances such as dust, sugar, pectin and the like in the bagasse, the bagasse is dried at the temperature of 48-52 ℃, so that the bagasse can be dried in a short time under the condition of ensuring that the properties of the bagasse cannot be damaged.
Further, the production method of the bagasse ultrafine powder comprises the following steps:
crushing bagasse;
mixing 1 part of crushed bagasse and 30 parts of water according to the parts by weight, and stirring at the temperature of 90 ℃ for 1.5 hours;
drying the mixed solution of the bagasse and water at 50 ℃;
and (4) pulverizing the dried bagasse.
Further, the powdering treatment comprises:
crushing the dried bagasse into bagasse coarse powder;
crushing bagasse coarse powder in a vibration mill for 15-25 min.
The bagasse is graded in a vibration mill and is crushed for 15-25min, so that the granularity of the prepared bagasse ultra-fine powder is 10nm-100 mu m, and the prepared degradable bagasse mulching film has higher structural strength.
Further, the crushing method of the bagasse coarse powder comprises the following steps:
and putting the dried bagasse into a high-speed universal pulverizer to be pulverized for 14-16s, and repeating for 2-4 times, wherein the time interval between every two adjacent times is 0.9-1.1 min.
Further, the powdering treatment comprises:
putting the dried bagasse into a high-speed universal pulverizer to pulverize for 15s, and repeating for 3 times, wherein the time interval between every two adjacent times is 1min, so as to obtain bagasse coarse powder;
crushing bagasse coarse powder in a vibration mill for 20 min.
The high-speed universal pulverizer is a device which utilizes the high-speed relative motion between movable fluted discs to pulverize the food and treat the comprehensive actions of tooth impact, friction, material impact and the like.
The high-speed universal pulverizer can fully pulverize bagasse, so that the granularity of the bagasse is reduced, and the crushing of a vibration mill is facilitated.
Specifically, the high-speed universal pulverizer is a commercially available high-speed universal pulverizer, and the specific structure thereof is the prior art and is not described herein again.
The vibration mill utilizes the high-frequency vibration of a cylinder, a steel ball or steel bar medium in the cylinder impacts materials by means of inertia force, and the acceleration of the medium impacting the materials can reach 10g-15g, so that the vibration mill has the advantages of compact structure, small volume, light weight, low energy consumption, high yield, concentrated grinding granularity, simplified process, simplicity in operation, convenience in maintenance, easiness in replacement of lining plate medium and the like, and can be widely applied to powder making in industries such as metallurgy, building materials, mines, fire resistance, chemical engineering, glass, ceramics, graphite and the like.
The bagasse coarse powder is crushed by a vibration mill, so that the grain diameter of the bagasse ultra-fine powder can reach the requirement of 10nm-100 mu m.
Specifically, the vibration mill is a commercially available vibration mill, and the specific structure thereof is the prior art and is not described herein again.
A degradable bagasse mulch film is prepared by the preparation method of the degradable bagasse mulch film.
The degradable bagasse mulching film can realize direct utilization of bagasse, has high structural strength, and has a degradability rate of over 95.
The features and properties of the present invention are described in further detail below with reference to examples.
Example 1
The embodiment provides a degradable bagasse mulching film, which is prepared by the following preparation method of the degradable bagasse mulching film, and comprises the following steps:
dissolving 4 parts of cassava starch in 88 parts of water by weight, and stirring at 88 ℃ to gelatinize the cassava starch;
after the cassava starch is gelatinized, adding 0.5 part by weight of bagasse ultrafine powder, and stirring;
after the bagasse ultrafine powder is fully stirred, 2 parts by weight of glycerol and 0.4 part by weight of sodium alginate are added, and the mixture is stirred at the temperature of 78 ℃ to dissolve the glycerol and the sodium alginate;
after the glycerol and the sodium alginate are fully dissolved, carrying out ultrasonic treatment for 40min to obtain colloidal fluid;
the colloid liquid is processed into the degradable bagasse mulching film.
Specifically, the method for processing the colloid liquid into the degradable bagasse mulching film comprises the following steps:
injecting the colloidal fluid into a prefabricated mold, standing for 1.5h at room temperature to ensure that the colloidal fluid is spread flatly and has stable form;
and drying the prefabricated mould filled with the colloidal fluid at the temperature of 48 ℃.
Specifically, the production method of the bagasse ultrafine powder comprises the following steps:
crushing bagasse;
mixing 1 part of crushed bagasse and 28 parts of water according to parts by weight, and stirring at the temperature of 88 ℃ for 1.3 hours;
drying the mixed solution of the bagasse and water at 48 ℃;
and (4) pulverizing the dried bagasse.
Specifically, the powdering treatment comprises:
putting the dried bagasse into a high-speed universal pulverizer to be pulverized for 14s, and repeating for 2 times, wherein the time interval between every two adjacent times is 0.9min, so as to obtain bagasse coarse powder;
crushing bagasse coarse powder in a vibration mill for 15 min.
Example 2
The embodiment provides a degradable bagasse mulching film, which is prepared by the following preparation method of the degradable bagasse mulching film, and comprises the following steps:
dissolving 5 parts of cassava starch in 90 parts of water according to parts by weight, and stirring at the temperature of 90 ℃ to gelatinize the cassava starch;
after the cassava starch is gelatinized, 1 part of bagasse ultrafine powder in parts by weight is added and stirred;
after the bagasse ultrafine powder is fully stirred, adding 3 parts by weight of glycerol and 0.5 part by weight of sodium alginate, and stirring at the temperature of 80 ℃ to dissolve the glycerol and the sodium alginate;
after the glycerol and the sodium alginate are fully dissolved, carrying out ultrasonic treatment for 45min to obtain a colloidal fluid;
the colloid liquid is processed into the degradable bagasse mulching film.
Specifically, the method for processing the colloid liquid into the degradable bagasse mulching film comprises the following steps:
injecting the colloidal fluid into a prefabricated mold, standing for 2h at room temperature to ensure that the colloidal fluid is spread flatly and has stable form;
and drying the prefabricated mould filled with the colloidal fluid at the temperature of 50 ℃.
Specifically, the production method of the bagasse ultrafine powder comprises the following steps:
crushing bagasse;
mixing 1 part of crushed bagasse and 30 parts of water according to the parts by weight, and stirring at the temperature of 90 ℃ for 1.5 hours;
drying the mixed solution of the bagasse and water at 50 ℃;
and (4) pulverizing the dried bagasse.
Specifically, the powdering treatment comprises:
putting the dried bagasse into a high-speed universal pulverizer to pulverize for 15s, and repeating for 3 times, wherein the time interval between every two adjacent times is 1min, so as to obtain bagasse coarse powder;
crushing bagasse coarse powder in a vibration mill for 20 min.
Example 3
The embodiment provides a degradable bagasse mulching film, which is prepared by the following preparation method of the degradable bagasse mulching film, and comprises the following steps:
dissolving 5 parts of cassava starch in 90 parts of water according to parts by weight, and stirring at the temperature of 90 ℃ to gelatinize the cassava starch;
after the cassava starch is gelatinized, 1.5 parts of bagasse ultrafine powder in parts by weight is added and stirred;
after the bagasse ultrafine powder is fully stirred, adding 3 parts by weight of glycerol and 0.5 part by weight of sodium alginate, and stirring at the temperature of 80 ℃ to dissolve the glycerol and the sodium alginate;
after the glycerol and the sodium alginate are fully dissolved, carrying out ultrasonic treatment for 45min to obtain a colloidal fluid;
the colloid liquid is processed into the degradable bagasse mulching film.
Specifically, the method for processing the colloid liquid into the degradable bagasse mulching film comprises the following steps:
injecting the colloidal fluid into a prefabricated mold, standing for 2h at room temperature to ensure that the colloidal fluid is spread flatly and has stable form;
and drying the prefabricated mould filled with the colloidal fluid at the temperature of 50 ℃.
Specifically, the production method of the bagasse ultrafine powder comprises the following steps:
crushing bagasse;
mixing 1 part of crushed bagasse and 30 parts of water according to the parts by weight, and stirring at the temperature of 90 ℃ for 1.5 hours;
drying the mixed solution of the bagasse and water at 50 ℃;
and (4) pulverizing the dried bagasse.
Specifically, the powdering treatment comprises:
putting the dried bagasse into a high-speed universal pulverizer to pulverize for 15s, and repeating for 3 times, wherein the time interval between every two adjacent times is 1min, so as to obtain bagasse coarse powder;
crushing bagasse coarse powder in a vibration mill for 20 min.
Example 4
The embodiment provides a degradable bagasse mulching film, which is prepared by the following preparation method of the degradable bagasse mulching film, and comprises the following steps:
dissolving 5 parts of cassava starch in 90 parts of water according to parts by weight, and stirring at the temperature of 90 ℃ to gelatinize the cassava starch;
after the cassava starch is gelatinized, adding 2 parts of bagasse ultrafine powder by weight, and stirring;
after the bagasse ultrafine powder is fully stirred, adding 3 parts by weight of glycerol and 0.5 part by weight of sodium alginate, and stirring at the temperature of 80 ℃ to dissolve the glycerol and the sodium alginate;
after the glycerol and the sodium alginate are fully dissolved, carrying out ultrasonic treatment for 45min to obtain a colloidal fluid;
the colloid liquid is processed into the degradable bagasse mulching film.
Specifically, the method for processing the colloid liquid into the degradable bagasse mulching film comprises the following steps:
injecting the colloidal fluid into a prefabricated mold, standing for 2h at room temperature to ensure that the colloidal fluid is spread flatly and has stable form;
and drying the prefabricated mould filled with the colloidal fluid at the temperature of 50 ℃.
Specifically, the production method of the bagasse ultrafine powder comprises the following steps:
crushing bagasse;
mixing 1 part of crushed bagasse and 30 parts of water according to the parts by weight, and stirring at the temperature of 90 ℃ for 1.5 hours;
drying the mixed solution of the bagasse and water at 50 ℃;
and (4) pulverizing the dried bagasse.
Specifically, the powdering treatment comprises:
putting the dried bagasse into a high-speed universal pulverizer to pulverize for 15s, and repeating for 3 times, wherein the time interval between every two adjacent times is 1min, so as to obtain bagasse coarse powder;
crushing bagasse coarse powder in a vibration mill for 20 min.
Example 5
The embodiment provides a degradable bagasse mulching film, which is prepared by the following preparation method of the degradable bagasse mulching film, and comprises the following steps:
dissolving 6 parts of cassava starch in 92 parts of water by weight, and stirring at the temperature of 92 ℃ to gelatinize the cassava starch;
after the cassava starch is gelatinized, 2.5 parts of bagasse ultrafine powder in parts by weight is added and stirred;
after the bagasse ultrafine powder is fully stirred, adding 4 parts by weight of glycerol and 0.6 part by weight of sodium alginate, and stirring at 82 ℃ to dissolve the glycerol and the sodium alginate;
after the glycerol and the sodium alginate are fully dissolved, carrying out ultrasonic treatment for 50min to obtain colloidal fluid;
the colloid liquid is processed into the degradable bagasse mulching film.
Specifically, the method for processing the colloid liquid into the degradable bagasse mulching film comprises the following steps:
injecting the colloidal fluid into a prefabricated mold, standing for 2.5 hours at room temperature to ensure that the colloidal fluid is spread flatly and has stable form;
and drying the prefabricated mould filled with the colloidal fluid at the temperature of 52 ℃.
Specifically, the production method of the bagasse ultrafine powder comprises the following steps:
crushing bagasse;
mixing 1 part of crushed bagasse and 32 parts of water according to the weight parts, and stirring at the temperature of 92 ℃ for 1.7 hours;
drying the mixed solution of the bagasse and water at 52 ℃;
and (4) pulverizing the dried bagasse.
Specifically, the powdering treatment comprises:
putting the dried bagasse into a high-speed universal pulverizer to be pulverized for 16s, and repeating for 4 times, wherein the time interval between every two adjacent times is 1.1min, so as to obtain bagasse coarse powder;
crushing bagasse coarse powder in a vibration mill for 25 min.
In conclusion, the degradable bagasse mulching film and the preparation method thereof provided by the embodiment of the invention can improve the utilization efficiency of bagasse, and a physical method is used for processing the bagasse, so that the complex pulping process of fiber-containing biomass such as bagasse is solved, the biomass such as bagasse is directly formed into a film in a solid form, and the method is simple and has strong applicability. And the granularity of the bagasse ultrafine powder is controlled between 10nm and 100 mu m, so that the bagasse ultrafine powder is used as a main raw material of the degradable bagasse mulching film. Compared with untreated bagasse, the raw material has enhanced material characteristics, and improves the performance of the degradable bagasse mulching film. And the degradation rate of the degradable bagasse mulching film can reach more than 95 percent, and the degradable bagasse mulching film can be used as a mulching film.
The embodiments described above are some, but not all embodiments of the invention. The detailed description of the embodiments of the present invention is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.