CN113083039A - Method for green and efficient preparation of corn straw-based cellulose triacetate porous membrane - Google Patents
Method for green and efficient preparation of corn straw-based cellulose triacetate porous membrane Download PDFInfo
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- CN113083039A CN113083039A CN202110407647.6A CN202110407647A CN113083039A CN 113083039 A CN113083039 A CN 113083039A CN 202110407647 A CN202110407647 A CN 202110407647A CN 113083039 A CN113083039 A CN 113083039A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
- B01D71/06—Organic material
- B01D71/08—Polysaccharides
- B01D71/12—Cellulose derivatives
- B01D71/14—Esters of organic acids
- B01D71/16—Cellulose acetate
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D67/00—Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus
- B01D67/0002—Organic membrane manufacture
- B01D67/0009—Organic membrane manufacture by phase separation, sol-gel transition, evaporation or solvent quenching
- B01D67/0011—Casting solutions therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D67/00—Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus
- B01D67/0002—Organic membrane manufacture
- B01D67/0009—Organic membrane manufacture by phase separation, sol-gel transition, evaporation or solvent quenching
- B01D67/0013—Casting processes
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C51/00—Preparation of carboxylic acids or their salts, halides or anhydrides
- C07C51/42—Separation; Purification; Stabilisation; Use of additives
- C07C51/43—Separation; Purification; Stabilisation; Use of additives by change of the physical state, e.g. crystallisation
- C07C51/44—Separation; Purification; Stabilisation; Use of additives by change of the physical state, e.g. crystallisation by distillation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2323/00—Details relating to membrane preparation
- B01D2323/12—Specific ratios of components used
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2325/00—Details relating to properties of membranes
- B01D2325/24—Mechanical properties, e.g. strength
Abstract
The invention provides a method for preparing a corn straw-based cellulose triacetate porous membrane in an environment-friendly and efficient manner, and relates to the field of crop straw utilization. The corn stalk-based cellulose triacetate porous membrane provided by the invention comprises three components of a pore-foaming agent, a nano material and cellulose triacetate, and the components are prepared into a membrane casting solution and then are subjected to a phase inversion method to form the membrane. The method specifically comprises the following steps: the method comprises the steps of pretreatment of corn straws, extraction of cellulose, preparation of corn straw-based triacetate fiber and a membrane casting solution, and preparation of a corn straw-based triacetate cellulose porous membrane. The preparation method provided by the invention has the characteristics of greenness, high efficiency, low raw material cost and equipment requirements and simple process flow.
Description
Technical Field
The invention belongs to the technical field of resource utilization of crop straws, and particularly relates to a method for preparing a cellulose triacetate porous membrane by using corn straws.
Background
Cellulose acetate is a commercially important cellulose derivative formed by largely substituting the 3 hydroxyl groups contained in the glucose units in cellulose with acetyl groups. Cellulose Acetate (CA) is widely prepared into various membranes with permeation functions and applied to water treatment in different environments due to the performance advantages of easy processing and film forming, good hydrophilicity, high salt rejection rate, pollution resistance, renewable raw materials and the like. However, most of the existing cellulose triacetate membranes are compact membranes, and the mechanical properties are poor. The preparation method of the cellulose triacetate base porous membrane, the regulation and control of the pore structure, the optimization of the membrane performance and other related researches are lacked.
In the past, most raw materials used for industrially producing cellulose acetate in China are high-grade pulp with high alpha-cellulose content, such as natural wood pulp, cotton pulp and the like, but wood resources in China are limited, the raw material cost is high, the process technology is complex, the environment is polluted, and the important thing is to search for cheap and high-quality raw materials.
At present, the process flow for preparing the cellulose acetate membrane is as follows: commercial cellulose acetate is dissolved in solvents such as dichloromethane, trichloromethane, dimethyl sulfoxide, N-dimethylformamide, N-dimethylacetamide, N-methyl-2-pyrrolidone, 1, 4-dioxane and the like, and the mixture is stirred for a plurality of hours, then is kept stand and defoamed to obtain a uniform membrane casting solution, and finally the membrane is prepared. The whole preparation process consumes a plurality of organic reagents and has a long membrane preparation period.
Therefore, the invention utilizes cheap and easily available corn straw raw materials to pretreat the raw materials to extract cellulose, and prepares the cellulose into cellulose triacetate membrane casting solution in one step and forms a membrane. The method not only widens the raw material source for synthesizing the cellulose acetate membrane, and makes the cellulose acetate membrane more fit for the construction of an environment-friendly society, but also provides technical support for the green high-value utilization of cellulose components in straw resources, and develops a way for the high-value utilization of the straw resources to a certain extent.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides an efficient preparation method for preparing a cellulose triacetate membrane casting solution and forming a membrane by one step by directly utilizing cellulose extracted from corn straws, a method of adding a pore-forming agent and a nano material is adopted, the structure of a membrane pore is regulated and controlled by regulating the adding amount of the pore-forming agent and the nano material, a porous membrane is prepared, and the property of the membrane is improved to a certain extent.
In order to achieve the purpose, the invention adopts the following specific technical scheme:
the method for preparing the corn straw-based cellulose triacetate porous membrane in a green and efficient manner comprises the following specific steps:
step one, pretreatment of corn straws and extraction of cellulose
Mechanically crushing the collected corn straws into particles, putting the particles into a reactor, and adding a mixed aqueous solution of peroxyacetic acid and maleic acid according to a certain solid-to-liquid ratio; setting reaction time and temperature for reaction; and after the reaction is finished, separating to obtain corn straw cellulose solid. Reference may be made in particular to the patents already disclosed: a one-step process for the separation of cellulose from lignocellulosic feedstocks (CN 111101394A), to which the present application refers in its entirety.
Step two, preparation of corn straw-based cellulose triacetate and membrane casting solution
Fully crushing the corn stalk cellulose prepared in the step one for later use; adding a pore-forming agent and a nano material into trifluoroacetic acid to be fully dissolved, uniformly mixing, adding corn straw cellulose, uniformly mixing and stirring, finally adding an acetic anhydride solution, carrying out esterification reaction for a period of time at a certain temperature, continuously stirring while carrying out esterification reaction, and finally standing and defoaming to obtain the uniform membrane casting solution in one step.
Step three, preparation of corn straw based cellulose triacetate porous membrane
And (2) placing the corn straw-based cellulose triacetate membrane casting solution prepared in the second step on a clean glass plate by adopting a phase inversion method, coating the membrane with a certain thickness by using a scraper, ventilating and volatilizing, adding deionized water to solidify and form a membrane, and finally performing heat treatment to obtain a finished product of the corn straw-based cellulose triacetate porous membrane.
Preferably, the pore-forming agent added in the second step is one or more of polyvinylpyrrolidone, lactic acid, polyethylene glycol, soluble starch and gum arabic powder.
Preferably, the nano material added in the second step is one or a mixture of more of halloysite nanotubes, carbon nanotubes, zeolite, diatomite and titanium dioxide.
Preferably, in the second step, the mass ratio of the corn stalk cellulose to the added nano material is 3: 1-6: 1, the mass ratio of the corn straw cellulose as the raw material to the added pore-foaming agent is 3: 1-6: 1. under the condition of the proportion, the prepared corn straw-based cellulose triacetate porous membrane has uniform and moderate aperture. The inventor further finds that the mass ratio of the corn straw cellulose as the raw material to the added nano material is 3: 1-4: 1, the mass ratio of the corn straw cellulose as the raw material to the added pore-foaming agent is 3: 1-4: 1, and the added nano material and the pore-forming agent have the same quality, the aperture of the prepared porous membrane is kept between 1 and 2 mu m, the mechanical strength is high, and the porous membrane is very suitable for being used as a permeation function membrane to be applied to environmental water treatment.
Preferably, in the second step, the concentration of acetic anhydride is 2-6mL/g and the concentration of trifluoroacetic acid is 5-20mL/g based on the mass of the corn straw cellulose as the raw material. Trifluoroacetic acid serves as a catalyst for preparing the cellulose triacetate, and is an excellent solvent for the cellulose triacetate, and under the optimal concentration, complete esterification reaction can be fully ensured, and raw materials can be saved.
Preferably, the esterification reaction temperature in the second step is 4-40 ℃, and the esterification reaction time is 10-90 min.
Preferably, the thickness of the membrane in the third step is 0.2-1mm, the ventilation and volatilization time is 10-60min, the temperature of the deionized water is 20-80 ℃, and the heat treatment temperature is 30-70 ℃.
In summary, the invention has the following advantages:
cellulose extracted from corn straws is directly used to prepare cellulose triacetate membrane casting solution in one step and form a membrane. The pore structure of the cellulose triacetate membrane can be regulated and controlled by regulating the adding content of the pore-forming agent and the nano material, wherein the added pore-forming agent has the pore-forming effect, and the added nano material can improve the hydrophilicity and the mechanical strength of the cellulose triacetate membrane. The prepared corn straw-based cellulose triacetate porous membrane has uniform and moderate aperture and high mechanical strength, and is suitable for being used as a permeation function membrane to be applied to environmental water treatment. The whole preparation process has the characteristics of greenness, high efficiency, low raw material cost and equipment requirement and simple process flow. Wherein, the trifluoroacetic acid is used as a catalyst for preparing the cellulose triacetate and is also an excellent solvent of the cellulose triacetate, and the casting solution can be prepared in one step without adding other casting solvents. After the preparation of the film, the trifluoroacetic acid can be collected and recycled by a rotary evaporation method, no pollutant is discharged in the whole process, and no environmental pollution is caused.
Drawings
To further illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below.
FIG. 1 is a scanning electron microscope image of the surface of a corn stalk-based cellulose triacetate porous film prepared in example 1 of the invention;
FIG. 2 is a scanning electron microscope image of the surface of a corn stalk-based cellulose triacetate porous film prepared in example 2 of the invention;
FIG. 3 is a scanning electron microscope image of the surface of a corn stalk-based cellulose triacetate film prepared in example 3 of the invention;
FIG. 4 is a scanning electron microscope image of the surface of a corn stalk-based cellulose triacetate film prepared in example 4 of the invention;
FIG. 5 is a scanning electron microscope image of the surface of a corn stalk-based cellulose triacetate film prepared in example 5 of the invention;
FIG. 6 is a scanning electron microscope image of the surface of a corn stalk-based cellulose triacetate film prepared in example 6 of the invention;
FIG. 7 is a scanning electron microscope image of the surface of a corn stalk-based cellulose triacetate porous film prepared in example 7 of the invention;
FIG. 8 is a surface scanning electron microscope image of a corn stalk-based cellulose triacetate porous film prepared in example 8 of the present invention;
FIG. 9 is a scanning electron microscope image of the surface of a corn stalk-based cellulose triacetate porous film prepared in example 9 of the invention;
FIG. 10 is a scanning electron microscope image of the surface of the corn stalk-based cellulose triacetate film prepared in comparative example 1 of the present invention.
Detailed Description
The present invention will be further described with reference to examples for better understanding, but the present invention is not limited to the examples, and those skilled in the art can make modifications without departing from the spirit and scope of the present invention. Accordingly, all equivalents are intended to fall within the scope of the invention, which is defined in the claims.
Example 1
Step one, pretreatment of corn straws and extraction of cellulose
Mechanically crushing the collected corn straws into particles, sieving the particles by a 40-mesh sieve, adding 4g of the corn straws, 160mL of mixed aqueous solution of 1.5 wt% of peroxyacetic acid and 3 wt% of maleic acid into a reaction container, setting the reaction temperature of the container to be 130 ℃, keeping the temperature for 60min, cooling to room temperature after the reaction is finished, and filtering to obtain the corn cellulose.
Step two, preparation of corn straw-based cellulose triacetate and membrane casting solution
And fully crushing the prepared corn straw cellulose for later use. Firstly, 0.14g of halloysite nanotube and 0.14g of polyvinylpyrrolidone are added into 20mL/g of trifluoroacetic acid to be fully dissolved, the mixture is uniformly mixed, then 0.5g of cellulose is added to be uniformly mixed and stirred, finally, 5mL/g of acetic anhydride solution is added, esterification reaction is carried out for 60min at 25 ℃, magnetic stirring is continuously carried out during the esterification reaction, and finally, standing and defoaming are carried out, so that the uniform membrane casting solution can be prepared in one step.
Step three, preparation of corn straw based cellulose triacetate porous membrane
Placing the corn stalk-based cellulose triacetate membrane casting solution on a clean glass plate by adopting a phase inversion method, coating the membrane with the thickness of 0.25mm by using a scraper, ventilating and volatilizing for 40min, adding deionized water at 20 ℃ for curing to form a membrane, and finally carrying out heat treatment at 40 ℃ to obtain a finished product of the corn stalk-based cellulose triacetate porous membrane.
Example 2
Step one, pretreatment of corn straws and extraction of cellulose
Mechanically crushing the collected corn straws into particles, sieving the particles by a 40-mesh sieve, adding 4g of the corn straws, 160mL of mixed aqueous solution of 1.5 wt% of peroxyacetic acid and 3 wt% of maleic acid into a reaction container, setting the reaction temperature of the container to be 130 ℃, keeping the temperature for 60min, cooling to room temperature after the reaction is finished, and filtering to obtain the corn cellulose.
Step two, preparation of corn straw-based cellulose triacetate and membrane casting solution
And fully crushing the prepared corn straw cellulose for later use. Firstly, 0.14g of carbon nano tube and 0.14g of polyvinylpyrrolidone are added into 20mL/g of trifluoroacetic acid to be fully dissolved and uniformly mixed, then 0.5g of cellulose is added to be uniformly mixed and stirred, finally, 5mL/g of acetic anhydride solution is added, esterification reaction is carried out for 60min at 25 ℃, magnetic stirring is continuously carried out while the esterification reaction is carried out, and finally, standing and defoaming are carried out, so that the uniform membrane casting solution can be prepared in one step.
Step three, preparation of corn straw based cellulose triacetate porous membrane
Placing the corn stalk-based cellulose triacetate membrane casting solution on a clean glass plate by adopting a phase inversion method, coating the membrane with the thickness of 0.25mm by using a scraper, ventilating and volatilizing for 40min, adding deionized water at 20 ℃ for curing to form a membrane, and finally carrying out heat treatment at 40 ℃ to obtain a finished product of the corn stalk-based cellulose triacetate porous membrane.
Example 3
Step one, pretreatment of corn straws and extraction of cellulose
Mechanically crushing the collected corn straws into particles, sieving the particles by a 40-mesh sieve, adding 4g of the corn straws, 160mL of mixed aqueous solution of 1.5 wt% of peroxyacetic acid and 3 wt% of maleic acid into a reaction container, setting the reaction temperature of the container to be 130 ℃, keeping the temperature for 60min, cooling to room temperature after the reaction is finished, and filtering to obtain the corn cellulose.
Step two, preparation of corn straw-based cellulose triacetate and membrane casting solution
And fully crushing the prepared corn straw cellulose for later use. Firstly, 0.28g of halloysite nanotube is added into 20mL/g trifluoroacetic acid to be fully dissolved, uniformly mixed, then 0.5g of cellulose is added to be uniformly mixed and stirred, finally, 5mL/g of acetic anhydride solution is added, esterification reaction is carried out for 60min at 25 ℃, magnetic stirring is continuously carried out during the esterification reaction, and finally, standing and defoaming are carried out, thus obtaining the uniform casting solution in one step.
Step three, preparation of corn straw based cellulose triacetate porous membrane
Placing the corn stalk-based cellulose triacetate membrane casting solution on a clean glass plate by adopting a phase inversion method, coating the membrane with the thickness of 0.25mm by using a scraper, ventilating and volatilizing for 40min, adding deionized water at 20 ℃ for curing to form a membrane, and finally carrying out heat treatment at 40 ℃ to obtain a finished product of the corn stalk-based cellulose triacetate membrane.
Example 4
Step one, pretreatment of corn straws and extraction of cellulose
Mechanically crushing the collected corn straws into particles, sieving the particles by a 40-mesh sieve, adding 4g of the corn straws, 160mL of mixed aqueous solution of 1.5 wt% of peroxyacetic acid and 3 wt% of maleic acid into a reaction container, setting the reaction temperature of the container to be 130 ℃, keeping the temperature for 60min, cooling to room temperature after the reaction is finished, and filtering to obtain the corn cellulose.
Step two, preparation of corn straw-based cellulose triacetate and membrane casting solution
And fully crushing the prepared corn straw cellulose for later use. Firstly, 0.28g of polyvinylpyrrolidone is added into 20mL/g of trifluoroacetic acid to be fully dissolved, the mixture is uniformly mixed, then 0.5g of cellulose is added to be uniformly mixed and stirred, finally, 5mL/g of acetic anhydride solution is added, esterification reaction is carried out for 60min at 25 ℃, magnetic stirring is continuously carried out during the esterification reaction, and finally, standing and defoaming are carried out, so that the uniform casting solution can be prepared in one step.
Step three, preparation of corn straw-based cellulose triacetate membrane
Placing the corn stalk-based cellulose triacetate membrane casting solution on a clean glass plate by adopting a phase inversion method, coating the membrane with the thickness of 0.25mm by using a scraper, ventilating and volatilizing for 40min, adding deionized water at 20 ℃ for curing to form a membrane, and finally carrying out heat treatment at 40 ℃ to obtain a finished product of the corn stalk-based cellulose triacetate membrane.
Example 5
The same amount of lactic acid is used for preparing the corn stalk-based cellulose triacetate film instead of the halloysite nanotube in the example 3, and other preparation conditions and addition amounts are consistent with those in the example 3.
Example 6
The same amount of polyethylene glycol is used for replacing the halloysite nanotube in the example 3 to prepare the corn straw-based cellulose triacetate film, and other preparation conditions and addition amounts are consistent with those in the example 3.
Example 7
The corn stalk-based cellulose triacetate porous membrane is prepared by replacing the halloysite nanotube and polyvinylpyrrolidone in example 1 by 0.11g of halloysite nanotube and 0.11g of polyvinylpyrrolidone, and other preparation conditions and addition amounts are consistent with those in example 1.
Example 8
The corn stalk-based cellulose triacetate porous membrane is prepared by replacing the halloysite nanotube and polyvinylpyrrolidone in example 1 by 0.08g of halloysite nanotube and 0.08g of polyvinylpyrrolidone, and other preparation conditions and addition amounts are consistent with those in example 1.
Example 9
The corn stalk-based cellulose triacetate porous membrane is prepared by replacing the halloysite nanotube and polyvinylpyrrolidone in example 1 by 0.07g of halloysite nanotube and 0.07g of polyvinylpyrrolidone, and other preparation conditions and addition amounts are consistent with those in example 1.
Comparative example 1
Step one, pretreatment of corn straws and extraction of cellulose
Mechanically crushing the collected corn straws into particles, sieving the particles by a 40-mesh sieve, adding 4g of the corn straws, 160mL of mixed aqueous solution of 1.5 wt% of peroxyacetic acid and 3 wt% of maleic acid into a reaction container, setting the reaction temperature of the container to be 130 ℃, keeping the temperature for 60min, cooling to room temperature after the reaction is finished, and filtering to obtain the corn cellulose.
Step two, preparation of corn straw-based cellulose triacetate and membrane casting solution
Fully crushing the prepared corn straw cellulose, firstly adding 0.5g of the corn straw cellulose into 20mL/g of trifluoroacetic acid for fully dissolving, uniformly mixing, then adding 5mL/g of acetic anhydride solution, carrying out esterification reaction for 60min at 25 ℃, continuously carrying out magnetic stirring while carrying out the esterification reaction, and finally standing for defoaming to obtain the uniform cellulose triacetate casting solution in one step.
Step three, preparation of corn straw-based cellulose triacetate membrane
Placing the corn stalk-based cellulose triacetate membrane casting solution on a clean glass plate by adopting a phase inversion method, coating the membrane with the thickness of 0.25mm by using a scraper, ventilating and volatilizing for 40min, adding deionized water at 20 ℃ for curing to form a membrane, and finally carrying out heat treatment at 40 ℃ to obtain a finished product of the corn stalk-based cellulose triacetate membrane.
As can be seen from fig. 1 to 6 and 10, in addition to examples 1 and 2, the porous membrane structure can be formed by adding two additives, namely the porogen and the nanomaterial. Otherwise, as in examples 3, 4, 5, and 6, only one of the porogen and the nanomaterial was added, a porous membrane structure was not formed, and the membrane surface was a dense structure, similar to comparative example 1 in which the porogen and the nanomaterial were not added.
Therefore, halloysite nanotubes and polyvinylpyrrolidone are selected as additives, the influence of the content of the additives on the pore-forming effect and the pore diameter is further researched, and early work is expected to be done for subsequent application. As can be seen from fig. 1, 7, 8 and 9, the pore size of the membrane is gradually reduced from 2 μm to 0.5 μm as the contents of the two additives are reduced, so that the corn stalk-based cellulose triacetate porous membrane with the desired pore size can be prepared by adjusting the contents of the additives. The inventor finally finds that the mass ratio of the corn straw cellulose as the raw material to the added nano material is 3: 1-6: 1, the mass ratio of the corn straw cellulose as the raw material to the added pore-foaming agent is 3: 1-6: 1, under the condition that the added nano material and the pore-forming agent have the same quality, the prepared corn straw based cellulose triacetate porous membrane has uniform and moderate aperture, and is suitable for being used as a permeation function membrane to be applied to environmental water treatment.
Claims (7)
1. A method for preparing a corn straw-based cellulose triacetate porous membrane in a green and efficient manner is characterized by comprising the following steps:
step one, pretreatment of corn straws and extraction of cellulose
Mechanically crushing the collected corn straws into particles, putting the particles into a reactor, and adding a mixed aqueous solution of peroxyacetic acid and maleic acid according to a certain solid-to-liquid ratio; setting reaction time and temperature for reaction; after the reaction is finished, separating to obtain corn straw cellulose solid;
step two, preparation of corn straw-based cellulose triacetate and membrane casting solution
Fully crushing the corn stalk cellulose prepared in the step one for later use; adding a pore-forming agent and a nano material into trifluoroacetic acid to be fully dissolved, uniformly mixing, adding corn straw cellulose, uniformly mixing and stirring, finally adding an acetic anhydride solution, carrying out esterification reaction for a period of time at a certain temperature, continuously stirring while carrying out esterification reaction, and finally standing and defoaming to obtain a uniform membrane casting solution in one step;
step three, preparation of corn straw based cellulose triacetate porous membrane
And (2) placing the corn straw-based cellulose triacetate membrane casting solution prepared in the second step on a clean glass plate by adopting a phase inversion method, coating the membrane with a certain thickness by using a scraper, ventilating and volatilizing, adding deionized water to solidify and form a membrane, and finally performing heat treatment to obtain a finished product of the corn straw-based cellulose triacetate porous membrane.
2. The method of claim 1, wherein: the pore-foaming agent added in the second step is one or a mixture of more of polyvinylpyrrolidone, lactic acid, polyethylene glycol, soluble starch and gum arabic powder.
3. The method of claim 1, wherein: the nano material added in the second step is one or a mixture of halloysite nanotubes, carbon nanotubes, zeolite, diatomite and titanium dioxide.
4. The method of claim 1, wherein: in the second step, the mass ratio of the corn straw cellulose as the raw material to the added nano material is 3: 1-6: 1, the mass ratio of the corn straw cellulose as the raw material to the added pore-foaming agent is 3: 1-6: 1.
5. the method of claim 1, wherein: in the second step, the esterification reaction temperature is 4-40 ℃, and the esterification reaction time is 10-90 min.
6. The method of claim 1, wherein: the thickness of the membrane in the third step is 0.2-1mm, the ventilation and volatilization time is 10-60min, the temperature of the deionized water is 20-80 ℃, and the heat treatment temperature is 30-70 ℃.
7. A corn stover-based cellulose triacetate porous membrane produced by the method of any one of claims 1 to 6.
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| CN116102792A (en) * | 2022-09-07 | 2023-05-12 | 中国农业大学 | Cellulose acetate film with ultraviolet shielding function, preparation method and application thereof |
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