CN114822920A - Composite material and preparation method and application thereof - Google Patents

Abstract

The application relates to the technical field of nano materials, in particular to a composite material and a preparation method and application thereof. The preparation method of the composite material comprises the following steps: providing a nano silver wire; carrying out alkali heating treatment on the nano silver wire to obtain a hydroxylated nano silver wire; carrying out esterification reaction on the hydroxylated nano silver wire and cellulose containing carboxyl in an alcohol solvent to obtain an esterification reaction product solution; and sequentially filtering and drying the esterification reaction product solution to obtain the composite material. According to the preparation method, the hydroxyl on the surface of the nano silver wire and the carboxyl on the surface of the cellulose are subjected to esterification condensation, so that the nano silver wire and the cellulose are fixedly connected through a chemical bond, the combination stability of the nano silver wire and the cellulose is remarkably superior to that of conventional physical adsorption, the prepared composite material has better stability, and meanwhile, the hydrogen bond on the surface of the cellulose is not influenced in the esterification reaction process, so that the self-repairing function is still maintained.

Description

Composite material and its preparation method and application

technical field

The present application belongs to the technical field of nanomaterials, and in particular relates to a composite material and a preparation method and application thereof.

Background technique

In recent years, with the development of intelligence and the rapid progress of electronic technology, flexible electronic materials have gradually entered people's field of vision. Flexible electronic materials are materials that can be squeezed and deformed, and have broad application prospects.

The current conductive thin film materials are limited by their own electrical conductivity and difficult-to-repair properties, which will limit their applications in many ways. On the one hand, it is difficult for conductive thin-film materials to satisfy both conductivity, stability and convenience of repeated use. Therefore, when preparing thin-film materials with excellent conductivity and stability, the self-healing ability of thin-film materials is also a very important consideration. On the other hand, some paper-based conductive materials have creases that are difficult to eliminate when they are bent, which will change some of their properties, reduce the uniformity of the material when it is reused, and ultimately reduce the reusability of the material.

Therefore, it is difficult to obtain conductive materials with good conductivity, stability and self-healing ability.

SUMMARY OF THE INVENTION

The purpose of this application is to provide a composite material, a preparation method and application thereof, and to solve the problem of how to improve the composite stability of silver nanowires and cellulose.

In order to realize the above-mentioned application purpose, the technical scheme adopted in this application is as follows:

In a first aspect, the present application provides a method for preparing a composite material, comprising the following steps:

Provide nano silver wire;

The nano-silver wire is subjected to alkali heating treatment to obtain hydroxylated nano-silver wire;

carrying out an esterification reaction between the hydroxylated silver nanowires and carboxyl-containing cellulose in an alcohol solvent to obtain an esterification reaction product solution;

The esterification reaction product solution is sequentially filtered and dried to obtain a composite material.

In one embodiment, the step of performing alkali heating treatment on the silver nanowires includes: placing the silver nanowires in an alkali solution, and then stirring and heating at a temperature of 50-60°C.

In one embodiment, the alkaline solution is selected from at least one of sodium hydroxide solution and potassium hydroxide solution; and/or,

The heating and stirring time is 10-13h.

In one embodiment, the step of carrying out an esterification reaction between the hydroxylated silver nanowires and carboxyl-containing cellulose in an alcohol solvent comprises:

Dispersing the hydroxylated silver nanowires in a first alcohol solvent to obtain a silver nanowire dispersion;

Dispersing the carboxyl-containing cellulose in a second alcohol solvent to obtain a cellulose dispersion;

The nano-silver wire dispersion liquid and the cellulose dispersion liquid are mixed to obtain a mixed liquid, and then the mixed liquid is subjected to hydrothermal treatment.

In one embodiment, the temperature of the hydrothermal treatment is 130-150° C., and the time is 25-35 min; and/or,

In the step of subjecting the mixed solution to hydrothermal treatment: a dehydrating agent is added to the mixed solution.

In one embodiment, the mass concentration of the nano-silver wire dispersion liquid is 4-6 mg/ml, and the mass concentration of the cellulose dispersion liquid is 0.1-0.3 mg/ml; and/or,

In the mixed solution, the mass ratio of the silver nanowires and the cellulose is 1:1.5-2.5.

In one embodiment, the filtration treatment is vacuum filtration membrane making; and/or,

The drying treatment step includes vacuum drying at 30-36°C.

In one embodiment, the preparation method of the silver nanowires includes:

Prepare a mixed solution containing silver salt and polyvinylpyrrolidone;

The mixed solution is added dropwise to the bottom solution containing copper chloride at 140-160° C., and the temperature is kept for 30-120 minutes.

In a second aspect, the present application provides a composite material prepared by the preparation method described in the present application.

In a third aspect, the present application provides an application of the above composite material in a flexible electronic device.

The method for preparing the composite material provided by the first aspect of the present application, by carrying out an esterification reaction between the hydroxylated nano silver wire and the carboxyl group-containing cellulose in an alcohol solvent, and the product solution is sequentially filtered and dried, so as to obtain nanometer A composite material composed of silver wires and cellulose; in the esterification reaction step of the preparation method, the hydroxyl groups on the surface of the silver nanowires and the carboxyl groups on the surface of cellulose undergo esterification condensation, so that the silver nanowires and the cellulose are fixedly connected by chemical bonds In this way, the stability of the combination of silver nanowires and cellulose is significantly better than that of conventional physical adsorption, so that the obtained composite material has better stability. At the same time, the process of esterification does not affect the surface hydrogen bonds of cellulose, so The self-healing function is still retained; in addition, the preparation method has simple conditions and quick reaction, which is beneficial to industrial manufacturing and mass production, and thus has a good application prospect.

The composite material provided in the second aspect of the present application is prepared by the unique preparation method of the present application, so the composite material has both excellent electrical conductivity stability and self-healing ability, and has a good application prospect.

Based on the properties of the composite material obtained by the preparation method in the third aspect of the present application, it can be well used as a conductive film in flexible electronic devices.

Description of drawings

In order to illustrate the technical solutions in the embodiments of the present application more clearly, the following briefly introduces the drawings that are used in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative effort.

Fig. 1 is the schematic flow sheet of the preparation method of the composite material provided in the embodiment of the present application;

Fig. 2 is the principle schematic diagram of the preparation method of the composite material provided in the embodiment of the present application;

FIG. 3 is a schematic diagram of a product obtained by the preparation method of the composite material provided in the embodiment of the present application.

Detailed ways

In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clear, the present application will be further described in detail below with reference to the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, but not to limit the present application.

In this application, the term "and/or", which describes the relationship between related objects, means that there can be three relationships, for example, A and/or B, which can mean that A exists alone, A and B exist at the same time, and B exists alone Happening. where A and B can be singular or plural. The character "/" generally indicates that the associated objects are an "or" relationship.

In this application, "at least one" refers to one or more, and "multiple" refers to two or more. "At least one item(s) below" or similar expressions thereof refer to any combination of these items, including any combination of single item(s) or plural items(s).

It should be understood that, in various embodiments of the present application, the size of the sequence numbers of the above-mentioned processes does not imply the sequence of execution, some or all of the steps may be executed in parallel or sequentially, and the execution sequence of each process should be based on its functions and It is determined by the internal logic and should not constitute any limitation on the implementation process of the embodiments of the present application.

The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. As used in the embodiments of this application and the appended claims, the singular forms "a," "the," and "the" are intended to include the plural forms as well, unless the context clearly dictates otherwise.

The weight of the relevant components mentioned in the description of the examples of this application can not only refer to the specific content of each component, but also can represent the proportional relationship between the weights of the components. It is within the scope disclosed in the description of the embodiments of the present application that the content of the ingredients is scaled up or down. Specifically, the mass described in the description of the embodiment of the present application may be a mass unit known in the chemical field, such as μg, mg, g, kg, etc.

The terms "first" and "second" are only used for descriptive purposes to distinguish objects such as substances from each other, and cannot be understood as indicating or implying relative importance or implying the number of indicated technical features. For example, without departing from the scope of the embodiments of the present application, the first XX may also be referred to as the second XX, and similarly, the second XX may also be referred to as the first XX. Thus, a feature defined as "first" or "second" may expressly or implicitly include one or more of that feature.

A first aspect of the embodiments of the present application provides a method for preparing a composite material, as shown in FIG. 1 , the preparation method includes the following steps:

S01: Provide nano silver wire;

S02: performing alkali heating treatment on the silver nanowires to obtain hydroxylated silver nanowires;

S03: carrying out an esterification reaction between the hydroxylated silver nanowires and carboxyl-containing cellulose in an alcohol solvent to obtain an esterification reaction product solution;

S04: The esterification reaction product solution is sequentially filtered and dried to obtain a composite material.

The composite material preparation method comprises the steps of subjecting the hydroxylated silver nanowires and carboxyl-containing cellulose to an esterification reaction in an alcohol solvent, and the product solution is sequentially filtered and dried to obtain a composite of nanosilver wires and cellulose. The composite material; in the esterification reaction step of the preparation method, the hydroxyl groups on the surface of the silver nanowires and the carboxyl groups on the surface of the cellulose undergo esterification condensation, so that the silver nanowires and the cellulose are fixedly connected by chemical bonds, so that the silver nanowires and The stability of cellulose binding is significantly better than that of conventional physical adsorption, which makes the obtained composite material have better stability. At the same time, the process of esterification does not affect the surface hydrogen bonds of cellulose, so the self-healing function is still retained; In addition, the preparation method has simple conditions and quick reaction, which is beneficial to industrial manufacturing and mass production.

Based on the esterification reaction of the preparation method in the examples of the present application, the silver nanowires and the cellulose are fixed by chemical bonds (covalent bonds are much larger than hydrogen bonds), so that the obtained composite material has better stability. Therefore, the composite material has better stability. After repeated bending for many times, the resistance changes very little, and it can still maintain good electrical conductivity for long-term use. Such electrical conductivity is significantly better than the physical adsorption (hydrogen bond) between the conventional silver nanowires and cellulose. Cellulose itself has self-healing properties. After it is damaged, it can be restored to the state before the damage by adding a small amount of water. Because the process of esterification does not affect the hydrogen bonds on the surface of cellulose, the self-healing function is still retained. Therefore, this preparation method Make the composite material still repairable. Therefore, the composite material obtained by the preparation method of the embodiment of the present application has both electrical conductivity stability and self-healing ability, and has a good application prospect.

In one embodiment, the silver nanowires provided above can be prepared by a polyol reduction method. Specifically, the preparation method of the nano-silver wire includes: preparing a polyol solution containing silver salt and polyvinylpyrrolidone; dropping the polyol solution into a polyol bottom solution containing copper chloride at 140-160° C., and keeping the temperature for 30- 120min, for example, the temperature can be 140°C, 142°C, 146°C, 150°C, 155°C, 160°C, etc., and the time can be 30min, 40min, 50min, 80min, 100min, 120min, etc. The preparation method of the nano-silver wire not only has simple operation, low cost and high repeatability, but also can obtain the nano-silver wire with uniform size, for example, the nano-silver wire of about 30 microns can be prepared.

Further, the polyol solvent used in the preparation of the above-mentioned silver nanowires is selected from at least one of ethylene glycol, propylene glycol, butylene glycol and glycerol. Taking ethylene glycol as an example, silver nitrate and polyvinylpyrrolidone are dissolved in ethylene glycol to obtain an ethylene glycol solution containing silver nitrate and polyvinylpyrrolidone. In addition, a small amount of cupric chloride is added to ethylene glycol to obtain a polyol bottom solution containing cupric chloride. First, heat the polyol bottom solution to 140-160 °C, then dropwise add the ethylene glycol solution containing silver nitrate and polyvinylpyrrolidone, keep the temperature at 140-160 °C and stir to carry out the reaction, so as to obtain nano-silver wires, and finally centrifugally separate and dry, A solid silver nanowire is obtained.

In one embodiment, the step of performing alkali heating treatment on the silver nanowires includes: placing the silver nanowires prepared above in an alkaline solution, and then heating and stirring at a temperature of 50 to 60° C., for example, at 50° C., 52° C. °C, 55 °C, 60 °C, etc. Through alkali heating treatment, the silver nanowires are hydroxylated to form hydroxyl groups on the surface, which can be subsequently reacted with the carboxyl groups on the surface of cellulose, so that the silver nanowires can be stably compounded on cellulose through chemical bonds, resulting in better stability. of composite materials.

Further, the alkaline solution is selected from at least one of sodium hydroxide solution and potassium hydroxide solution; the time of heating and stirring under the temperature condition of 50～60℃ is 10～13h, for example, the temperature can be 50℃, 52℃ , 55℃, 60℃, the time can be 10h, 11h, 12h, 13h, etc. Under this condition, the silver nanowires can be hydroxylated better.

In one embodiment, the carboxyl-containing cellulose can be selected from one or a mixture of carboxyl nanocellulose or other carboxyl-containing bacterial cellulose. For example, carboxyl nanocellulose can be prepared by a one-step oxidation method using ammonium persulfate. Specifically, using cellulose as a raw material and ammonium persulfate as an oxidant, a one-pot method is used to ester carboxyl nanocellulose.

In one embodiment, the step of carrying out an esterification reaction between the hydroxylated silver nanowires and carboxyl-containing cellulose such as carboxyl nanocellulose in an alcohol solvent comprises: dispersing the hydroxylated silver nanowires in a first alcohol solvent , to obtain a nano-silver wire dispersion; disperse the carboxyl-containing cellulose in a second alcohol solvent to obtain a cellulose dispersion; mix the nano-silver wire dispersion and the cellulose dispersion to obtain a mixed solution, and then subject the mixed solution to water heat treatment. In alcohol solvent, the esterification reaction is promoted by hydrothermal conditions, and the hydroxyl groups on the surface of silver nanowires can better react with the carboxyl groups on the surface of cellulose.

In one embodiment, after the nano-silver wire dispersion liquid and the cellulose dispersion liquid are mixed to obtain a mixed liquid, in the step of subjecting the mixed liquid to hydrothermal treatment: a dehydrating agent is added to the mixed liquid. For example, adding a strong dehydrating agent, sodium hypophosphite (NaPH ₂ O ₂ ), can better promote the esterification reaction. As shown in Figure 2, the carboxyl groups on the cellulose surface and the hydroxyl groups on the surface of the silver nanowires heat-treated with _sodium hydroxide solution undergo dehydration and condensation under the action of the dehydrating agent _NaPH2O2 , thereby obtaining a composite material with better stability. .

Specifically, the above-mentioned alcohol solvent for esterification of hydroxylated silver nanowires and carboxyl-containing cellulose in an alcohol solvent includes a first alcohol solvent and a second alcohol solvent, which may be the same or different. For example, methanol, ethanol and propanol may be the same or different. Ethanol is preferred.

Further, the temperature of the hydrothermal treatment is 130-150°C, such as 130°C, 135°C, 140°C, 145°C, 150°C, etc., and the time is 25-35min, such as 25min, 27min, 30min, 35min, etc. Under these conditions, the esterification reaction can sufficiently proceed.

Further, the hydroxylated silver nanowires are dispersed in the nanosilver wire dispersion liquid obtained in the first alcohol solvent, and the mass concentration of the silver nanowires is 4-6 mg/ml, such as 4 mg/ml, 4.5 mg/ml, 5 mg /ml, 5.5mg/ml, 6mg/ml; in the cellulose dispersion obtained by dispersing carboxyl-containing cellulose in the second alcohol solvent, the mass concentration of cellulose is 0.1-0.3mg/ml, such as 0.1mg/ml ml, 0.15mg/ml, 0.2mg/ml, 0.25mg/ml, 0.3mg/ml; and in the mixture obtained by mixing the two, the mass ratio of silver nanowires and cellulose is 1:1.5~2.5, such as 1 : 1.5, 1:2, 1:2.2, 1:2.5. Under the above conditions, the silver nanowires and cellulose are fully combined, so that the comprehensive effect of the conductive stability and self-healing ability of the obtained composite material is the best.

Specifically, the esterification reaction product solution obtained by the esterification reaction contains a composite material, and the esterification reaction product solution is subjected to filtration treatment and drying treatment in sequence, so as to obtain a dry composite material by extraction.

In one embodiment, the filtration treatment is vacuum filtration. The product obtained by suction filtration can be a composite material film, which is further dried to obtain a composite material solid film. It can be further compressed, so that a composite material film of the required thickness can be obtained. The composite material film is a cellulose film containing nano-silver wires, which has both excellent electrical conductivity stability and self-healing ability. Therefore, it can be used as a conductive film in in flexible electronics.

In one embodiment, the drying treatment step includes vacuum drying at 30-36°C, specifically, such as 30°C, 32°C, 35°C, 36°C, and the like. In this way, the alcohol solvent can volatilize better.

The embodiment of the present application also provides a composite material, and the composite material is prepared by the above-mentioned preparation method of the embodiment of the present application. Based on the characteristics of the above-mentioned preparation method of the composite material, the composite material of the embodiment of the present application has both excellent electrical conductivity stability and self-healing ability, and has a good application prospect. The optional solutions of the above-mentioned preparation method of the composite material can all be used in the composite material, so the composite material has all the advantages of the above-mentioned preparation method provided by the above-mentioned embodiments, and will not be repeated here.

The embodiment of the present application also provides an application of the above composite material in a flexible electronic device. Based on the properties of the composite material obtained by the preparation method in the embodiment of the present application, it can be well applied to flexible electronic devices as a conductive film.

The preparation method of the composite material based on the embodiment of the present application is simple and easy to operate, low in cost, and can be mass-produced, and the composite material prepared by the preparation method can be used as a cellulose paper-based film containing silver nanowires and has excellent self- Repair performance and good electrical conductivity stability, and have the advantage of being highly customized, and electrical self-healing materials with high mechanical strength can be prepared as required.

The following description will be given in conjunction with specific embodiments.

Example 1

The preparation method of composite material comprises the following steps:

(1) Preparation of silver nanowires:

Preparation of mixed solution: Weigh 0.2g of silver nitrate and dissolve it in 20mL of ethylene glycol, stir evenly, after it dissolves, add 0.4g of polyvinylpyrrolidone (molecular weight: 58000), stir evenly to obtain a mixed solution;

Synthesis of nanowires: Dissolve cupric chloride dihydrate in ethylene glycol, and prepare a cupric chloride solution with a concentration of 4 mM; add 20 mL of ethylene glycol to a 100 mL three-neck round bottom flask, and heat it in an oil bath. to 160 degrees Celsius for 1 hour, then add 2 to 4 mL of the prepared cupric chloride solution, and continue to heat and stir for 15 minutes; use a constant pressure separatory funnel to slowly add the above mixed solution containing nitrate and polyvinylpyrrolidone dropwise to the round-bottomed flask During the dropwise addition, the temperature of the system was maintained and stirred; after the dropwise addition was completed, the reaction was continued with heating and stirring for 30min; the suspension obtained after the reaction was cooled, centrifuged, washed, and redispersed in ethanol to obtain Ethanol dispersion of silver nanowires.

(2) Modification of silver nanowires

The above-obtained silver nanowires were placed in a sodium hydroxide solution, heated and stirred at 50°C for 12 hours to obtain hydroxylated silver nanowires; then centrifuged, washed, and redispersed into ethanol to obtain a hydroxylated nanosilver wire dispersion (mass concentration is 5mg/ml).

(3) Synthesis of composite materials

Carboxyl nanocellulose was prepared by one-step oxidation of ammonium persulfate with cellulose as raw material. Disperse an appropriate amount of carboxyl nanocellulose into ethanol, and use an emulsifying machine to disperse evenly to obtain a carboxyl nanocellulose solution (mass concentration is 0.2 mg/ml). The carboxyl nanocellulose solution was mixed with the hydroxylated nano-silver wire dispersion liquid obtained above (wherein, carboxyl nano-cellulose 10mg, hydroxylated nano-silver wire 5mg) and used an emulsifying machine to disperse for 3 hours, and continue to stir and disperse for 12 hours, It is uniformly dispersed in the liquid to obtain a mixed liquid. The obtained mixed solution was transferred into the reaction kettle, NaPH ₂ O ₂ was added, and then closed hydrothermally heated to 140 degrees Celsius, and the reaction was continued for 30 minutes. After the reaction, filter with a vacuum filtration device to collect the obtained solid, use a vacuum drying oven to dry under a vacuum of 35 degrees Celsius for 12 hours, and then compress into a composite film with a thickness of 80 microns, as shown in Figure 3.

Example 2

The preparation method of composite material comprises the following steps:

(1) Preparation of silver nanowires:

Same as Example 1.

(2) Modification of silver nanowires

The obtained silver nanowires were placed in a sodium hydroxide solution, heated and stirred at 60°C for 13 h to obtain hydroxylated silver nanowires; then centrifuged, washed, and redispersed in ethanol to obtain a hydroxylated nanosilver wire dispersion ( The mass concentration is 6 mg/ml).

(3) Synthesis of composite materials

Carboxyl nanocellulose was prepared by one-step oxidation of ammonium persulfate with cellulose as raw material. Disperse an appropriate amount of carboxyl nanocellulose into ethanol, and use an emulsifying machine to disperse evenly to obtain a solution of carboxyl nanocellulose (mass concentration is 0.1 mg/ml). The carboxyl nanocellulose solution was mixed with the above-obtained hydroxylated silver nanowire dispersion (wherein, carboxyl nanocellulose 15mg, hydroxylated nanosilver wire 6mg) and used an emulsifying machine to disperse for 4 hours, and continue to stir and disperse for 14 hours, It is uniformly dispersed in the liquid to obtain a mixed liquid. The obtained mixed solution was transferred into the reaction kettle, and the closed hydrothermal heating was carried out to 150 degrees Celsius, and the reaction was continued for 30 minutes. After the reaction, the solid was collected by filtration with a vacuum filtration device, dried in a vacuum oven at 35 degrees Celsius for 12 hours, and then compressed into a composite film with a thickness of 90 microns.

Comparative Example 1

The preparation method of composite material comprises the following steps:

The cellulose is not carboxylated and the silver nanowires are not hydroxylated, and the cellulose and the silver nanowires are directly dispersed in ethanol to obtain a mixed solution (10 mg of cellulose and 5 mg of silver nanowires). The obtained mixed solution was filtered with a vacuum filtration device, and the obtained solid was collected, dried in a vacuum drying oven at a vacuum of 35 degrees Celsius for 12 hours, and then compressed into a composite film with a thickness of 80 microns.

Comparative Example 2

The preparation method of composite material comprises the following steps:

The cellulose is not carboxylated and the silver nanowires are not hydroxylated, and the cellulose and the silver nanowires are directly dispersed in ethanol to obtain a mixed solution (15 mg of cellulose and 6 mg of silver nanowires). The obtained mixed solution was filtered with a vacuum filtration device, and the obtained solid was collected, dried in a vacuum drying oven at a vacuum of 35 degrees Celsius for 12 hours, and then compressed into a composite film with a thickness of 90 microns.

Performance Testing

The composite material films prepared in the above examples and comparative examples were measured with a resistance tester: after repeated bending at the same position for many times (50 times, 100 times), the resistance increase range is shown in Table 1.

Table 1

project 50 times of bending resistance increase 100 times of bending resistance increase Example 1 3.4% 7% Example 2 3.8% 8.1% Comparative Example 1 10% 19% Comparative Example 2 11% 20%

It can be seen from Table 1 above that the composite materials prepared in the examples of the present application have better electrical conductivity stability.

The above descriptions are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the protection of the present application. within the range.

Claims (10)

1. The preparation method of the composite material is characterized by comprising the following steps:

providing a nano silver wire;

carrying out alkali heating treatment on the nano silver wire to obtain a hydroxylated nano silver wire;

carrying out esterification reaction on the hydroxylated nano silver wire and cellulose containing carboxyl in an alcohol solvent to obtain an esterification reaction product solution;

and sequentially filtering and drying the esterification reaction product solution to obtain the composite material.

2. The method of claim 1, wherein the step of subjecting the silver nanowires to an alkali heat treatment comprises: and (3) placing the nano silver wire in an alkali solution, and then heating and stirring at the temperature of 50-60 ℃.

3. The method according to claim 2, wherein the alkali solution is at least one selected from a sodium hydroxide solution and a potassium hydroxide solution; and/or the presence of a gas in the gas,

the heating and stirring time is 10-13 h.

4. The method of claim 1, wherein the step of subjecting the hydroxylated silver nanowires to an esterification reaction with a cellulose containing carboxyl groups in an alcohol solvent comprises:

dispersing the hydroxylated nano silver wire in a first alcohol solvent to obtain a nano silver wire dispersion liquid;

dispersing the cellulose containing carboxyl in a second alcohol solvent to obtain a cellulose dispersion liquid;

and mixing the nano silver wire dispersion liquid and the cellulose dispersion liquid to obtain a mixed liquid, and then carrying out hydrothermal treatment on the mixed liquid.

5. The preparation method according to claim 4, wherein the temperature of the hydrothermal treatment is 130 to 150 ℃ and the time is 25 to 35 min; and/or the presence of a gas in the gas,

the step of subjecting the mixed solution to hydrothermal treatment comprises: and a dehydrating agent is added into the mixed solution.

6. The method according to claim 4, wherein the mass concentration of the nano-silver wire dispersion is 4 to 6mg/ml, and the mass concentration of the cellulose dispersion is 0.1 to 0.3 mg/ml; and/or the presence of a gas in the gas,

in the mixed solution, the mass ratio of the nano silver wires to the cellulose is 1: 1.5 to 2.5.

7. The production method according to any one of claims 1 to 6, wherein the filtration treatment is vacuum filtration; and/or the presence of a gas in the gas,

the drying treatment step comprises vacuum drying at the temperature of 30-36 ℃.

8. The method of any one of claims 1 to 6, wherein the method of preparing the silver nanowires comprises:

preparing a polyalcohol solution containing silver salt and polyvinylpyrrolidone;

and dropwise adding the polyhydric alcohol solution into a polyhydric alcohol base solution containing copper chloride at 140-160 ℃, and keeping the temperature for 30-120 min.

9. A composite material produced by the production method according to any one of claims 1 to 8.

10. Use of the composite material of claim 9 in a flexible electronic device.

Images