Biomass all-component film as well as preparation method and application thereof

Abstract

The invention relates to a biomass all-component film as well as a preparation method and application thereof, the preparation method comprises the following steps: (1) coating a biomass all-component solution to form a film, and then regenerating and forming to obtain a regenerated film; and (2) washing and drying the regenerated film to obtain the biomass all-component film, wherein the biomass all-component solution is prepared by dissolving biomass-containing raw materials with organic alkali. By utilizing the preparation method provided by the invention, the biomass all-component thin film can be quickly and efficiently prepared from the biomass all-component solution, and the thin film is relatively excellent in strength and can well meet application requirements.

Description

Technical Field

[0001] The present disclosure relates to the technical field of film preparation, and in particular to a biomass full-component film and a preparation method and application thereof. Background Art

[0002] In order to cope with the environmental pollution caused by excessive use of traditional non-degradable plastic films, the development of environmentally friendly biomass film materials has attracted more and more attention. Renewable and degradable plant resources such as forests and bamboo have become a hot topic of research. Plant materials are mainly composed of cellulose, lignin and hemicellulose. Cellulose, one of the plant materials, is the most abundant natural polymer in the world. Due to its easy functionalization and film-forming characteristics, the cellulose film obtained from it is expected to replace petroleum-based films.

[0003] However, the extraction of cellulose and the preparation of films usually require strict chemical or special physical treatments, which will generate a lot of pollution and energy consumption. Directly dissolving biomass without separation and extraction to prepare bio-based full-component films can perfectly avoid the above problems, but there is currently no research on how to directly prepare films using biomass. Summary of the invention

[0004] In order to solve the above technical problems, the present disclosure provides a biomass full-component film and a preparation method and application thereof.

[0005] In a first aspect, the present disclosure provides a method for preparing a biomass full-component film, the preparation method comprising the following steps:

[0006] (1) coating a biomass full component solution into a film, and then regenerating the film to obtain a regenerated film;

[0007] (2) washing and drying the regenerated film to obtain the biomass full-component film;

[0008] The biomass full component solution is prepared by dissolving raw materials containing biomass using an organic base.

[0009] As a preferred technical solution of the present invention, the coating film forming method is selected from scraping, and the thickness of the scraping is preferably 0.1-5mm, for example, 0.2mm, 0.5mm, 0.8mm, 1.0mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, etc.

[0010] As a preferred technical solution of the present disclosure, the regeneration molding method includes: regeneration in a regeneration bath.

[0011] As a preferred technical solution of the present disclosure, the regeneration time is 1-30 min, for example, 2 min, 5 min, 10 min, 15 min, 20 min, 25 min, 28 min, etc.

[0012] As a preferred technical solution of the present disclosure, the regeneration bath is selected from any one of water, alcohol solution or acid solution or a combination of at least two thereof, preferably an alcohol solution and / or water, most preferably an alcohol solution.

[0013] As a preferred technical solution of the present disclosure, the alcohol solution is selected from any one of methanol, ethanol, propanol, butanol, pentanol or hexanol, or a combination of at least two thereof.

[0014] As a preferred technical solution of the present disclosure, the organic base is selected from alkyl quaternary ammonium base and / or alkyl quaternary phosphonium base, preferably the alkyl quaternary ammonium base is selected from any one of tetramethylammonium hydroxide, tetraethylammonium hydroxide, tetrapropylammonium hydroxide, tetrabutylammonium hydroxide, triethylbenzylammonium hydroxide or methyltrioctylammonium hydroxide, or a combination of at least two thereof, and preferably the alkyl quaternary phosphonium base is selected from any one of tetramethylphosphonium hydroxide, tetraethylphosphonium hydroxide, tetrapropylphosphonium hydroxide or tetrabutylphosphonium hydroxide, or a combination of at least two thereof.

[0015] As a preferred technical solution of the present disclosure, the raw material containing biomass is selected from any one of trees, grass plants, sugar cane or crop straws, or a combination of at least two of them, preferably grass plants, and more preferably bamboo.

[0016] As a preferred technical solution of the present invention, the concentration of the biomass full component solution is 1-20%, for example, 2%, 3%, 4%, 5%, 6%, 7%, 8%, 9%, 10%, 12%, 15%, 18%, etc., preferably 1-10%, and further preferably 2-8%.

[0017] As a preferred technical solution of the present disclosure, the biomass full component solution contains lignin, cellulose and hemicellulose.

[0018] As a preferred technical solution of the present disclosure, the washing solvent is water.

[0019] As a preferred technical solution of the present disclosure, the drying is carried out by air drying.

[0020] As a preferred technical solution of the present disclosure, the drying temperature is 10-100°C, for example, 15°C, 20°C, 30°C, 40°C, 50°C, 60°C, 70°C, 80°C, 90°C, etc., preferably 40-80°C.

[0021] As a preferred technical solution of the present disclosure, the preparation method also includes: before coating and film formation, performing a degassing treatment, preferably a vacuum degassing treatment, and the degassing time is preferably 10-120 minutes, for example 20 minutes, 30 minutes, 40 minutes, 50 minutes, 80 minutes, 100 minutes, 110 minutes, etc.

[0022] In a second aspect, the present disclosure provides a biomass full-component film obtained by the preparation method described in the first aspect.

[0023] As a preferred technical solution of the present disclosure, the tensile strength of the film is ≥40 MPa, preferably ≥50 MPa, and further preferably ≥55 MPa, for example, 56 MPa, 57 MPa, 58 MPa, 59 MPa, 60 MPa, 62 MPa, etc.

[0024] As a preferred technical solution of the present invention, the thickness of the biomass full-component film is 0.01-5mm, for example, 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1.0mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, etc., preferably 0.1-2mm, and further preferably 0.1-1mm.

[0025] In a third aspect, the present disclosure provides use of the biomass full-component film described in the second aspect in the preparation of a washing device, preferably in a packaging material for a washing device.

[0026] Compared with the prior art, the technical solution provided by the embodiments of the present disclosure has the following advantages:

[0027] (1) The preparation method provided by the present disclosure can directly prepare a biomass full-component film from a biomass full-component solution, and a film with better performance can be directly obtained without the need for stretching and other steps during the preparation process. The preparation method is simple and easy to implement;

[0028] (2) The biomass full component solution used in the present disclosure uses the full components of biomass as raw materials, and does not require complex steps such as decomposition and extraction of the various components of biomass, and the preparation process greatly reduces energy consumption;

[0029] (3) Both the biomass full component solution provided by the present disclosure and the method for preparing a film described in the present disclosure can greatly reduce the complexity of preparation and reduce production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0031] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0032] Figure 1 This is a polarizing microscope image of the biomass full-component solution obtained in Preparation Example 1 of the present disclosure;

[0033] Figure 2 It is a schematic diagram of the process of preparing the biomass full-component film disclosed in the present invention;

[0034] Figure 3 This is a photo of the actual object after the scraping film is formed in Example 1 of the present disclosure;

[0035] Figure 4 This is a physical photo of the biomass full-component film obtained in Example 1 of the present disclosure. DETAILED DESCRIPTION

[0036] In order to more clearly understand the above-mentioned objectives, features and advantages of the present disclosure, the scheme of the present disclosure will be further described below. It should be noted that the embodiments of the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0037] In the following description, many specific details are set forth to facilitate a full understanding of the present disclosure, but the present disclosure may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present disclosure, rather than all of the embodiments.

[0038] In the prior art, films prepared from plant materials generally require strict chemical or physical treatment of the plant materials to extract the cellulose therein, and then the cellulose film is prepared from the cellulose solution. The extraction process often requires strict chemical or special physical treatment, which will generate a lot of pollution and energy consumption. At the same time, the subsequent film preparation process also needs to go through relatively cumbersome film formation-gel-stretching and other steps to obtain a film that meets the application requirements.

[0039] In order to solve the above technical problems, the present invention provides a biomass full-component film and its preparation method and application. The preparation method provided by the present invention can quickly and efficiently prepare a biomass full-component film from a biomass full-component solution, and the film has good strength and can well meet application requirements.

[0040] In a first aspect, the present disclosure provides a method for preparing a biomass full-component film, the preparation method comprising the following steps:

[0041] (1) coating a biomass full component solution into a film, and then regenerating the film to obtain a regenerated film;

[0042] (2) washing and drying the regenerated film to obtain the biomass full-component film;

[0043] The biomass full component solution is prepared by dissolving raw materials containing biomass using an organic base.

[0044] The preparation method provided by the present disclosure can directly convert a biomass full-component solution into a biomass full-component film using a simple and low-cost preparation method. The prepared film has excellent mechanical strength and can well meet application requirements.

[0045] The biomass described in the present disclosure refers to biomass in a narrow sense, that is, the biomass described in the present disclosure refers to lignocellulosic biomass, which contains lignin, cellulose and hemicellulose; the biomass full component solution described in the present disclosure is a solution obtained by directly dissolving all components of biomass without any separation or extraction methods, and the solution includes not only cellulose, but also lignin and hemicellulose.

[0046] As a preferred technical solution of the present disclosure, the coating film forming method is selected from scraping, and the thickness of the scraping is preferably 0.1-5mm. The scraping film forming described in the present disclosure can adopt any existing method that can achieve scraping, and the present disclosure is not limited here, and the scraping speed is preferably 0.1-5m / min.

[0047] As a preferred technical solution of the present disclosure, the regeneration molding method includes: regeneration in a regeneration bath, that is, gelation in a coagulation bath.

[0048] The regeneration molding method disclosed in the present invention does not require a stretching step. After direct coating and regeneration, the solvent is cleaned and then dried to obtain a biomass full-component film that can meet application requirements.

[0049] As a preferred technical solution of the present disclosure, the regeneration time is 1-30 minutes.

[0050] As a preferred technical solution of the present disclosure, the regeneration bath is selected from any one of water, alcohol solution or acid solution or a combination of at least two thereof, preferably an alcohol solution and / or water, most preferably an alcohol solution.

[0051] The present disclosure finds that if an alcohol solution is used as a regeneration bath, the performance of the final biomass full-component film can be optimized.

[0052] As a preferred technical solution of the present disclosure, the alcohol solution is selected from any one of methanol, ethanol, propanol, butanol, pentanol or hexanol, or a combination of at least two thereof.

[0053] As a preferred technical solution of the present disclosure, the preparation method of the biomass full component solution is as follows:

[0054] (1) drying, crushing, and sieving the raw material containing biomass;

[0055] (2) mixing and dissolving the sieved raw material with a solution containing an organic base;

[0056] (3) The dissolved solution is filtered to obtain the biomass full component solution.

[0057] As a preferred technical solution of the present disclosure, the dissolution includes pre-dissolution and grinding dissolution.

[0058] The preparation method provided by the present disclosure includes the steps of crushing and dissolving (grinding and dissolving can be introduced to accelerate the dissolution rate). By adjusting the different parameters of the above steps, the adjustment and optimization of each stage of the process can be achieved, thereby meeting the dissolution requirements of different types of raw materials.

[0059] As a preferred technical solution of the present disclosure, the organic base is selected from alkyl quaternary ammonium base and / or alkyl quaternary phosphonium base, preferably the alkyl quaternary ammonium base is selected from any one of tetramethylammonium hydroxide, tetraethylammonium hydroxide, tetrapropylammonium hydroxide, tetrabutylammonium hydroxide, triethylbenzylammonium hydroxide or methyltrioctylammonium hydroxide, or a combination of at least two thereof, and preferably the alkyl quaternary phosphonium base is selected from any one of tetramethylphosphonium hydroxide, tetraethylphosphonium hydroxide, tetrapropylphosphonium hydroxide or tetrabutylphosphonium hydroxide, or a combination of at least two thereof.

[0060] The preferred alkyl quaternary ammonium base and / or alkyl quaternary phosphonium base solution disclosed in the present invention can directly dissolve wood cellulose (lignin, cellulose and hemicellulose) to finally obtain a full-component solution; the step of separating the three components can be omitted, and the preparation method is simple and easy.

[0061] Furthermore, when using a solution containing an organic base to dissolve biomass, preferably, the solution containing an organic base provided by the present invention may only include an organic base and water, and may achieve complete dissolution without adding an auxiliary agent. Not adding an auxiliary agent may reduce production costs on the one hand, and on the other hand, it is also beneficial for recycling the solvent when using the subsequent biomass full component solution.

[0062] As a preferred technical solution of the present disclosure, the solution containing organic base is an aqueous solution containing organic base, and the concentration of the solution containing organic base is preferably 10-80wt%, preferably 45-80wt%, further preferably 45-60wt%, and more preferably 50-60wt%.

[0063] As a preferred technical solution of the present disclosure, the raw material containing biomass is selected from any one of trees, grass plants, sugar cane or crop straws, or a combination of at least two of them, preferably grass plants, and more preferably bamboo.

[0064] As a preferred technical solution of the present disclosure, the concentration of the biomass full component solution is 1-20%, preferably 1-10%, and more preferably 2-8%.

[0065] As a preferred technical solution of the present disclosure, the biomass full component solution contains lignin, cellulose and hemicellulose.

[0066] The biomass full component solution used in the present invention is a biomass full component solution prepared by directly dissolving all components of the raw material by a one-step dissolution method without any separation or extraction of the raw material. It can solve the current problems of incomplete dissolution of all biomass components or low dissolution efficiency, and realizes rapid and efficient dissolution of all biomass components in the solvent.

[0067] As a preferred technical solution of the present disclosure, the washing solvent is water.

[0068] As a preferred technical solution of the present disclosure, the drying is carried out by air drying.

[0069] As a preferred technical solution of the present disclosure, the drying temperature is 10-100°C, preferably 40-80°C.

[0070] As a preferred technical solution of the present disclosure, the wind speed of the blast drying is 0.1-100 m / s.

[0071] As a preferred technical solution of the present disclosure, the preparation method also includes winding.

[0072] The above processes can all be carried out in an automated mechanical form to achieve continuous production, and the conveyor belt speed can be 1-10m / min.

[0073] In a second aspect, the present disclosure provides a biomass full-component film obtained by the preparation method described in the first aspect.

[0074] Compared with cellulose film, the biomass full-component film obtained in the present invention has comparable strength to cellulose film, even better hydrophobicity than cellulose film, and has certain toughness and gas barrier properties, and has good application prospects.

[0075] As a preferred technical solution of the present disclosure, the tensile strength of the film is ≥40 MPa, preferably ≥50 MPa, and further preferably ≥55 MPa.

[0076] The film provided by the present invention has excellent mechanical properties and is sufficient to meet the application requirements of packaging materials.

[0077] As a preferred technical solution of the present disclosure, the thickness of the biomass full-component film is 0.01-5 mm, preferably 0.1-2 mm, and more preferably 0.1-1 mm.

[0078] In a third aspect, the present disclosure provides use of the biomass full-component film described in the second aspect in the preparation of a washing device, preferably in a packaging material for a washing device.

[0079] The technical solution of the present disclosure is further described below through specific implementation methods.

[0080] Preparation Example 1

[0081] The purpose of this preparation example is to provide a method for preparing a biomass full component solution and the biomass full component solution obtained thereby.

[0082] (1) crushing the bamboo and passing it through a 120-mesh sieve to obtain bamboo powder with a size of 120 mesh (actually ≤120 mesh);

[0083] (2) Mixing bamboo powder with 45 wt % TBAH / H2O solvent for pre-dissolution, the bamboo powder concentration is 4 wt %, the pre-dissolution temperature is controlled at 15° C., and the dissolution time is 24 h;

[0084] (3) grinding the pre-dissolved bamboo powder mixture using a sawtooth grinding device at a grinding speed of 1000 revolutions per minute for 4 hours;

[0085] (4) The solution after grinding and dissolution is filtered using a 4000-mesh sieve to obtain the biomass full component solution.

[0086] Referring to the preparation method of Preparation Example 1, biomass full component solutions of different concentrations were prepared.

[0087] Performance Test 1

[0088] (1) The biomass full component solution (solution before filtration) provided in Preparation Example 1 was characterized using a polarizing microscope to determine whether there were residual undissolved components such as lignin in the biomass full component solution. The results are shown in FIG. Figure 1 :

[0089] Figure 1 This is a polarizing microscope image of the biomass full-component solution obtained in Preparation Example 1. As can be seen from the figure, there is no bright light corresponding to the cellulose crystal area in the figure, indicating that the cellulose in the raw material is completely dissolved, because cellulose, lignin and hemicellulose are dissolved simultaneously, therefore, it is shown that the preparation method provided by the present disclosure can completely dissolve all components (lignin, cellulose and hemicellulose) in bamboo powder to obtain a full-component solution.

[0090] (2) The contents of the three elements (lignin, cellulose and hemicellulose) in the raw bamboo powder and the obtained biomass full component solution were analyzed using a cellulose analyzer. The results showed that the contents of the three elements in the biomass full component solution were basically consistent with the contents of the three elements in the raw bamboo powder, which also proved that the preparation method provided by the present invention can completely dissolve all the components (lignin, cellulose and hemicellulose) in the bamboo powder to obtain a full component solution.

[0091] Example 1

[0092] This embodiment provides a method for preparing a biomass full-component film and a biomass full-component film obtained therefrom. The process diagram of the preparation method is shown in Figure 2 .

[0093] (1) A 4% biomass full component solution was subjected to vacuum degassing for 30 min;

[0094] (2) The treated solution is subjected to scraping film forming, see Figure 3 , the film thickness is 0.75mm, and the scraping speed is 0.5m / min;

[0095] (3) The film was gelled in ethanol at a transfer rate of 1 m / min and a gelling time of 15 min;

[0096] (4) Spray washing in water, the conveying rate is 1m / min, and the spraying time is 10min;

[0097] (5) Blast heating drying, temperature is 60°C, wind speed is 10m / s, conveying speed is 1m / min, and drying time is 10min;

[0098] (6) The winding speed is 1 m / min, and the obtained biomass full-component film is Figure 4 .

[0099] Example 2

[0100] This embodiment provides a method for preparing a biomass full-component film and a biomass full-component film obtained thereby.

[0101] (1) A 6% biomass full component solution was subjected to vacuum degassing for 60 min;

[0102] (2) The treated solution is subjected to scraping film forming, the film thickness is 0.5 mm, and the scraping rate is 1 m / min;

[0103] (3) The film was gelled in butanol at a transfer rate of 2 m / min and a gelling time of 10 min;

[0104] (4) Spray washing in water, the conveying rate is 2m / min, and the spraying time is 20min;

[0105] (5) Blast heating drying, temperature is 60°C, wind speed is 10m / s, conveying speed is 2m / min, and drying time is 5min;

[0106] (6) The winding speed is 2m / min.

[0107] Example 3

[0108] This embodiment provides a method for preparing a biomass full-component film and a biomass full-component film obtained thereby.

[0109] (1) A biomass full component solution with a concentration of 8% was subjected to vacuum degassing for 90 minutes;

[0110] (2) The treated solution is subjected to scraping film forming, the film thickness is 0.5 mm, and the scraping rate is 2 m / min;

[0111] (3) The film was gelled in ethanol at a transfer rate of 4 m / min and a gelling time of 5 min;

[0112] (4) Spray washing in water, the conveying rate is 4m / min, and the spraying time is 15min;

[0113] (5) Blast heating drying, temperature is 50°C, wind speed is 10m / s, conveying speed is 4m / min, and drying time is 20min;

[0114] (6) The winding speed is 4m / min.

[0115] Example 4

[0116] This embodiment provides a method for preparing a biomass full-component film and a biomass full-component film obtained thereby.

[0117] (1) A 10% biomass full component solution was subjected to vacuum degassing for 120 min;

[0118] (2) The treated solution is subjected to scraping film forming, the film thickness is 0.25 mm, and the scraping rate is 4 m / min;

[0119] (3) The film was gelled in butanol at a transfer rate of 6 m / min and a gelling time of 1 min;

[0120] (4) Spray washing in water, the conveying rate is 6m / min, and the spraying time is 5min;

[0121] (5) Blast heating drying, temperature is 40°C, wind speed is 10m / s, conveying speed is 6m / min, and drying time is 15min;

[0122] (6) The winding speed is 6m / min.

[0123] Example 5

[0124] This embodiment provides a method for preparing a biomass full-component film and a biomass full-component film obtained thereby.

[0125] (1) A 4% biomass full component solution was subjected to vacuum degassing for 30 min;

[0126] (2) The treated solution is subjected to scraping film forming, the film thickness is 5 mm, and the scraping rate is 1 m / min;

[0127] (3) The film was gelled in ethanol at a transfer rate of 0.5 m / min and a gelling time of 30 min;

[0128] (4) Spray washing in water, the conveying rate is 0.5m / min, and the spraying time is 10min;

[0129] (5) Blast heating drying, temperature is 40°C, wind speed is 10m / s, conveying speed is 0.5m / min, and drying time is 15min;

[0130] (6) The winding speed is 0.5m / min.

[0131] Example 6

[0132] This embodiment provides a method for preparing a biomass full-component film and a biomass full-component film obtained thereby.

[0133] The difference from Example 1 is that in this example, the coagulation bath used is water.

[0134] Example 7

[0135] This embodiment provides a method for preparing a biomass full-component film and a biomass full-component film obtained thereby.

[0136] The difference from Example 1 is that in this example, the coagulation bath used is an aqueous solution with a hydrochloric acid concentration of 2 wt %.

[0137] Comparative Example 1

[0138] This comparative example provides a method for preparing a biomass full-component film and a biomass full-component film obtained thereby.

[0139] The difference from Example 1 is that in this comparative example, it further comprises (3'): stretching after regeneration, and the stretching ratio is 1:2.

[0140] Comparative Example 2

[0141] This comparative example provides a method for preparing a cellulose film and a cellulose film obtained thereby.

[0142] The difference from Example 1 is that in this comparative example, the raw material used is a cellulose solution with a concentration of 4% (Aladdin Chemical Reagent Co., Ltd., degree of polymerization 500-600).

[0143] Performance Testing

[0144] The performance test of the films provided in Examples 1-7 and Comparative Examples 1-2 was performed as follows:

[0145] (1) Mechanical properties (tensile strength and elongation at break): tested using a universal tensile testing machine in accordance with GB / T 1040-2006. The test standards are as follows:

[0146] Prepare long strip samples with a width of 10 mm and a length of >50 mm. During the test, the initial spacing of the fixtures used by the universal tensile testing machine is 50 mm, and the test rate is 50 mm / min until the sample breaks. Each sample is tested 5 times in parallel, and the average value is calculated to obtain the maximum tensile strength and elongation at break.

[0147] Note: The test direction is the film forming direction, i.e. the coating direction.

[0148] (2) Hydrophobicity: Place the sample to be tested horizontally, drop 1-5 μL of water on the surface of the sample to be tested, and use a contact angle tester to test the contact angle of the sample.

[0149] (3) Oxygen barrier properties: tested using a gas permeability tester in accordance with the testing standard ISO 2556-1974.

[0150] The test results are shown in Table 1:

[0151] Table 1

[0152]

[0153]

[0154] If it is used in packaging materials, its hydrophobicity and oxygen barrier properties also need to be considered. The test results are shown in Table 2:

[0155] Table 2

[0156]

[0157] In order to ensure that the biomass full-component film finally obtained can have a better application effect, it is required to have a certain flexibility. The elongation at break of the film provided by the present disclosure is shown in Table 3:

[0158] Table 3

[0159] sample Elongation at break / % Example 1 6.4 Example 2 7.1 Example 3 6.7

[0160] It can be seen from the embodiments and performance tests that the film provided by the present invention is made of biomass as raw material. After simple dissolution, coating, regeneration, washing and drying, the obtained biomass full-component film has mechanical strength and airtight barrier properties comparable to those of cellulose film. At the same time, the hydrophobicity of the film obtained by the present invention is better than that of cellulose film, and the flexibility can also meet the application requirements.

[0161] From the comparison between Example 1 and Examples 6-7, it can be seen that the selection of alcohol substances as the coagulation bath can make the performance of the film finally obtained better, and water as the coagulation bath is second. From the comparison between Example and Comparative Example 1, it can be seen that the film provided by the present disclosure has excellent mechanical strength even without operations such as drawing, and can meet the requirements; from the comparison between Example and Comparative Example 2, it can be seen that the performance of the film provided by the present disclosure can be comparable to that of cellulose film.

[0162] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0163] The above description is only a specific embodiment of the present disclosure, so that those skilled in the art can understand or implement the present disclosure. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure will not be limited to the embodiments described herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for preparing a biomass full-component film, characterized in that: The preparation method comprises the following steps: (1) coating a biomass full component solution into a film, and then regenerating the film to obtain a regenerated film; (2) washing and drying the regenerated film to obtain the biomass full-component film; The biomass full component solution is prepared by dissolving raw materials containing biomass using an organic base.

2. The preparation method according to claim 1, characterized in that: The coating film-forming method is selected from blade coating, and the thickness of the blade coating is preferably 0.1-5 mm.

3. The preparation method according to claim 1 or 2, characterized in that: The regeneration molding method comprises: regenerating in a regeneration bath; Preferably, the regeneration time is 1-120 min; Preferably, the regeneration bath is selected from any one of water, alcohol solution or acid solution or a combination of at least two thereof, preferably an alcohol solution and / or water, most preferably an alcohol solution; Preferably, the alcohol solution is selected from any one of methanol, ethanol, propanol, butanol, pentanol or hexanol, or a combination of at least two thereof.

4. The preparation method according to any one of claims 1 to 3, characterized in that The organic base is selected from alkyl quaternary ammonium base and / or alkyl quaternary phosphonium base, preferably the alkyl quaternary ammonium base is selected from any one or a combination of at least two of tetrabutylammonium hydroxide, triethylbenzylammonium hydroxide or methyltrioctylammonium hydroxide, and preferably the alkyl quaternary phosphonium base is selected from any one or a combination of at least two of tetramethylphosphonium hydroxide, tetraethylphosphonium hydroxide, tetrapropylphosphonium hydroxide or tetrabutylphosphonium hydroxide.

5. The preparation method according to any one of claims 1 to 4, characterized in that: The raw material containing biomass is selected from any one of trees, grasses, sugar cane or crop straws, or a combination of at least two of them, preferably grasses, and more preferably bamboo.

6. The preparation method according to any one of claims 1 to 5, characterized in that: The concentration of the biomass full component solution is 1-20%, preferably 1-10%, and more preferably 2-8%; And / or, the biomass full component solution contains lignin, cellulose and hemicellulose.

7. The preparation method according to any one of claims 1 to 6, characterized in that: The washing solvent is water; And / or, the drying is performed by air drying; And / or, the drying temperature is 10-100°C, preferably 30-80°C.

8. A biomass full-component film obtained by the preparation method according to any one of claims 1 to 7.

9. The biomass full-component film according to claim 8, characterized in that: The tensile strength of the film is ≥40MPa, preferably ≥45MPa, and more preferably ≥50MPa; And / or, the thickness of the biomass full-component film is 0.01-5 mm, preferably 0.1-2 mm, and more preferably 0.1-1 mm.

10. Use of the biomass full-component film according to claim 8 or 9 in the preparation of a washing device, preferably in the packaging material of a washing device.

Images