Cellulose raw material for polaroid triacetate fiber and preparation method of cellulose raw material
By using non-grain biomass and dynamic fermentation technology to prepare bacterial cellulose raw materials with low crystallinity and low polymerization, the problem of high preparation cost is solved, and resource reuse and high-purity bacterial cellulose production are realized, which is suitable for cellulose triacetate films.
Patent Information
- Application Number
- CN202510966496.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-14
- Publication Date
- 2025-10-21
AI Technical Summary
Existing technologies make it difficult to prepare bacterial cellulose with low crystallinity and low degree of polymerization at low cost, resulting in reliance on foreign imports for cellulose triacetate raw materials, which affects the independence of the industrial chain.
Using non-grain biomass as the carbon and nitrogen source for microbial fermentation, combined with dynamic stirred fermentation and a biofilm reactor, and through washing, homogenization and bleaching treatments, bacterial cellulose raw materials with low crystallinity and low polymerization degree are prepared.
It reduces reliance on traditional food crops, promotes resource reuse, reduces energy consumption, and improves the purity and tensile strength of bacterial cellulose, making it suitable for the production of cellulose triacetate films.
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Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of cellulose, and in particular to a cellulose raw material for polarizer triacetate and a preparation method thereof. Background Art
[0002] Cellulose triacetate film is a high-performance film material primarily composed of cellulose triacetate. It features high light transmittance, excellent chemical stability, superior weather resistance, and high tensile strength. It is widely used in liquid crystal displays, augmented and virtual reality, new energy, and automotive applications. Cellulose triacetate film is primarily used as a protective film for LCD polarizers, enhancing the mechanical strength of PVA film and improving LCD display quality. Currently, the production of cellulose triacetate for polarizers is primarily monopolized by foreign companies. The core performance of cellulose triacetate is highly correlated with the purity and degree of polymerization of the cellulose raw material. Therefore, obtaining this raw material is crucial for achieving industrial autonomy.
[0003] Bacterial cellulose is a highly polymerized cellulose produced by bacteria. It exists in the form of a highly hydrated membrane, is free of lignin and hemicellulose, has a higher molecular weight and higher crystallinity, and possesses an ultrafine network structure. Due to its unique properties, it has a wide range of applications as a biomaterial in industry (papermaking, textiles, and food), as well as in cosmetics and medicine. The free hydroxyl groups of bacterial cellulose can be acetylated in a very short time, making the reaction process simpler and easier to control the degree of substitution. Cellulose triacetate prepared from bacterial cellulose has a higher degree of polymerization and mechanical strength than cotton linter cellulose.
[0004] However, large-scale production of bacterial cellulose is not yet mature. Raw materials primarily come from expensive organic materials like coconut water. The high crystallinity and high degree of polymerization of bacterial cellulose obtained through conventional alkaline treatment also make it difficult to dissolve in homogeneous systems for esterification. Therefore, designing a low-cost method to produce bacterial cellulose with low crystallinity and low degree of polymerization has become a pressing technical challenge for those skilled in the art. Summary of the Invention
[0005] Technical problems solved
[0006] In view of the above-mentioned shortcomings of the prior art, the present invention provides a cellulose raw material for polarizer triacetate and a preparation method thereof, aiming to prepare bacterial cellulose with low crystallinity and low polymerization degree using a low-cost preparation method.
[0007] Technical Solution
[0008] To achieve the above objectives, the present invention is implemented through the following technical solutions:
[0009] A method for preparing cellulose raw material for polarizer triacetate, the preparation method comprising:
[0010] S1. preparing a mixed culture medium using non-food biomass instead of a carbon source and a nitrogen source, then inoculating Acetobacter xylinum into the mixed culture medium at a 10% inoculum rate, and obtaining a bacterial cellulose fermentation component after culturing and fermentation;
[0011] S2, cleaning the bacterial cellulose fermentation component to remove excess bacterial liquid and culture medium, and the resulting product is recorded as the bacterial cellulose component;
[0012] S3. The bacterial cellulose components are homogenized and beaten to obtain bacterial cellulose slurry, and then the bacterial cellulose slurry is bleached. Finally, the cellulose raw material for triacetate fiber of polarizer is obtained after pulping.
[0013] Furthermore, the preparation method of the mixed culture medium in S1 is:
[0014] S1.1. Weigh 20-25 g of a carbon source, 10-14 g of a nitrogen source, 1-2 g of anhydrous citric acid, and 3-4 g of disodium hydrogen phosphate dodecahydrate into 1000 mL of deionized water. Stir magnetically and record this as the basal medium.
[0015] S1.2, weigh 200-250g of orange peel and crush it in a blender, mix it with 200mL of deionized water and stir it evenly, filter it with a filter cloth to remove the orange peel residue, and record the result as orange peel mixture;
[0016] S1.3. Mix the basal culture medium and the orange peel mixture in an equal volume ratio. After mixing evenly, add agar powder to adjust the viscosity to 50-100 mPa·s. Then adjust the pH value to 4.8-5.0 and sterilize under high pressure to obtain the mixed culture medium.
[0017] Furthermore, the carbon source component in S1.1 is one or more of straw sugar, sugarcane molasses, beet molasses and cassava starch, the nitrogen source component in S1.1 is one or more of cottonseed cake, wheat bran, corn steep liquor, yeast paste and soybean meal, and the magnetic stirring method in S1.1 is stirring at a stirring speed of 400-500 r / min for 10 minutes.
[0018] Furthermore, the method for uniform stirring in S1.2 is stirring at a stirring speed of 500-600 r / min for 10 minutes, the method for uniform mixing in S1.3 is stirring at a stirring speed of 500-600 r / min for 5 minutes, and the method for high-pressure sterilization in S1.3 is sterilization at 121° C. for 30 minutes under a pressure of 0.1 MPa.
[0019] Furthermore, the culture and fermentation conditions in S1 are a method combining dynamic stirring fermentation and a biofilm reactor, and the culture temperature and time of the culture and fermentation in S1 are 25-30° C. and 48-96 h, respectively.
[0020] Furthermore, the cleaning method in S2 is:
[0021] The bacterial cellulose fermentation component is immersed in an ethanol aqueous solution with a mass fraction of 75%, and then the bacterial cellulose membrane is transferred to deionized water, stirred and heated at a temperature of 98°C and a stirring speed of 200-300 r / min for 20 minutes, and then immersed in a cooking liquid with a mass fraction of sodium hydroxide and sodium tripolyphosphate of 2% and 1% respectively, and cooked at a temperature of 80-100°C for 90-120 minutes. After slurrying, it is washed with deionized water until the sodium ion concentration is less than 10 mg / L.
[0022] Furthermore, the homogenizing beating method in S3 is:
[0023] First, high shear homogenization is performed at a speed of 8000-15000r / min for 30-50min, followed by high-pressure homogenization at a pressure of 500-800bar for 15-20min. After one high shear homogenization and two high-pressure homogenizations, homogenization and beating are completed, and the pulp concentration is controlled at 1-2%.
[0024] Furthermore, the bleaching method in S3 is:
[0025] S3.1. Immerse the bacterial cellulose slurry in a sodium hypochlorite solution for 30-50 minutes, then wash with deionized water until the pH is less than 9. The resulting slurry is referred to as the first fraction.
[0026] S3.2. Add 3-5 times the weight of deionized water to the first component, boil for 30 minutes, and then wash with deionized water to a pH of 6.5-7.5. Then add 2% by weight of hydrogen peroxide and treat for 15-20 minutes, and wash again with deionized water to a pH of 6.5-7.5.
[0027] Furthermore, the effective chlorine concentration of the sodium hypochlorite solution in S3.1 is 0.15-0.3 g / L.
[0028] A cellulose raw material for triacetate fiber for polarizer is prepared by a preparation method of the cellulose raw material for triacetate fiber for polarizer.
[0029] Beneficial effects
[0030] The present invention provides a cellulose raw material for polarizer triacetate and a preparation method thereof. Compared with the existing known technology, the present invention has the following beneficial effects:
[0031] 1. The present invention uses non-food biomass as the carbon and nitrogen source for microbial fermentation, and converts it into bacterial cellulose through microbial metabolism, which can reduce dependence on traditional food crops, reduce resource waste, and at the same time recycle agricultural waste resources, which is environmentally friendly and sustainable. Compared with the original extraction method using cotton pulp, the preparation method of the present invention has lower energy consumption and fewer steps, and can avoid the use of acid and other organic reagents. Secondly, by selecting the culture medium, fermentation method and post-treatment method, the present invention can make the polymerization degree and crystallinity of the obtained cellulose raw material slurry lower than those of general bacterial cellulose, which is conducive to the further esterification reaction.
[0032] 2. The cooking and homogenization method of the present invention can reduce the presence of extracts and alkali-soluble substances, especially metal ions, in the original pulp while ensuring the purity of the original bacterial cellulose. Secondly, the present invention uses bacterial cellulose to provide a synthetic raw material for triacetyl cellulose. Compared with the original cotton pulp raw material, the prepared bacterial cellulose raw material has higher tensile strength and less impurities, which is more conducive to the production and application of triacetyl cellulose film for polarizers.
[0033] 3. The fermentation method of the present invention, which combines dynamic stirring fermentation and biofilm reactor, can improve fermentation efficiency and shorten fermentation time. Dynamic stirring can increase the oxygen solubility in the culture medium and promote aerobic respiration and metabolic activities of microorganisms. The biofilm reactor can provide a larger specific surface area, which is conducive to the attachment and growth of microorganisms and the formation of a stable biofilm, thereby improving the yield and quality of bacterial cellulose. DETAILED DESCRIPTION
[0034] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.
[0035] The present invention will be further described below with reference to the embodiments.
[0036] Example 1
[0037] The present embodiment provides a method for preparing a cellulose raw material for polarizer triacetate, and the preparation method is as follows:
[0038] S1. preparing a mixed culture medium using non-food biomass instead of a carbon source and a nitrogen source, then inoculating Acetobacter xylinum into the mixed culture medium at a 10% inoculum rate, and culturing the culture medium at a temperature of 25° C. for 48 hours using a combination of dynamic stirring fermentation and a biofilm reactor to obtain a bacterial cellulose fermentation component;
[0039] Wherein, the preparation method of mixed culture medium is:
[0040] S1.1. Weigh 20 g of sugarcane molasses, 10 g of soybean meal, 1 g of anhydrous citric acid, and 3 g of disodium hydrogen phosphate dodecahydrate into 1000 mL of deionized water. Stir at 400 rpm for 10 min. This is referred to as the basal medium.
[0041] S1.2. Weigh 200 g of orange peel and blend it in a blender. Mix it with 200 mL of deionized water and stir at 500 rpm for 10 min. Filter the mixture through a filter cloth to remove the orange peel residue. The resulting mixture is referred to as the orange peel mixture.
[0042] S1.3. Mix the basal culture medium and the orange peel mixture in an equal volume ratio, stir at 500 r / min for 5 min, add agar powder to adjust the viscosity to 50 mPa·s, then adjust the pH to 4.8 and sterilize at 121°C under a pressure of 0.1 MPa for 30 min to obtain the mixed culture medium.
[0043] S2, cleaning the bacterial cellulose fermentation component to remove excess bacterial liquid and culture medium, and the resulting product is recorded as the bacterial cellulose component;
[0044] Among them, the cleaning method is:
[0045] The bacterial cellulose fermentation component is immersed in an ethanol aqueous solution with a mass fraction of 75%, and then the bacterial cellulose membrane is transferred to deionized water, stirred and heated at a temperature of 98°C and a stirring speed of 200r / min for 20 minutes, and then immersed in a cooking solution with a mass fraction of sodium hydroxide and sodium tripolyphosphate of 2% and 1% respectively, and cooked at a temperature of 80°C for 90 minutes. After slurrying, it is washed with deionized water until the sodium ion concentration is less than 10mg / L.
[0046] S3. The bacterial cellulose components are homogenized and beaten to obtain bacterial cellulose slurry, and then the bacterial cellulose slurry is bleached. Finally, the cellulose raw material for triacetate fiber of polarizer is obtained after pulping.
[0047] Among them, the method of homogenizing and beating is:
[0048] First, high shear homogenization is performed at a speed of 8000r / min for 30 minutes, followed by high-pressure homogenization at a pressure of 500bar for 15 minutes. After one high shear homogenization and two high-pressure homogenizations, the homogenization beating is completed, and the pulp concentration is controlled at 1%.
[0049] The bleaching method is:
[0050] S3.1. Immerse the bacterial cellulose slurry in a sodium hypochlorite solution with an effective chlorine concentration of 0.15 g / L for 30 min, then wash with deionized water until the pH is less than 9. The resulting solution is referred to as the first fraction.
[0051] S3.2. Add 3 times the weight of deionized water to the first component, boil for 30 minutes, and then wash with deionized water to a pH of 6.5. Then add 2% by weight of hydrogen peroxide and treat for 15 minutes. Wash again with deionized water to a pH of 6.5.
[0052] A cellulose raw material for triacetate fiber for polarizer is prepared by a preparation method of the cellulose raw material for triacetate fiber for polarizer.
[0053] Example 2
[0054] The present embodiment provides a method for preparing a cellulose raw material for polarizer triacetate, and the preparation method is as follows:
[0055] S1. preparing a mixed culture medium using non-food biomass instead of a carbon source and a nitrogen source, then inoculating Acetobacter xylinum into the mixed culture medium at a 10% inoculum rate, and culturing the culture medium at 30° C. for 96 hours using a combination of dynamic stirring fermentation and a biofilm reactor to obtain a bacterial cellulose fermentation component;
[0056] Wherein, the preparation method of mixed culture medium is:
[0057] S1.1. Weigh 25 g of straw sugar, 14 g of cottonseed cake, 2 g of anhydrous citric acid, and 4 g of disodium hydrogen phosphate dodecahydrate into 1000 mL of deionized water. Stir at 500 rpm for 10 min and record this as the basal medium.
[0058] S1.2. Weigh 250 g of orange peel and blend it in a blender. Mix it with 200 mL of deionized water and stir at 600 rpm for 10 min. Filter the mixture through a filter cloth to remove the peel residue. The resulting mixture is referred to as the orange peel mixture.
[0059] S1.3. Mix the basal culture medium and the orange peel mixture in an equal volume ratio, stir at 600 r / min for 5 min, add agar powder to adjust the viscosity to 100 mPa·s, then adjust the pH to 5.0 and sterilize at 121°C under a pressure of 0.1 MPa for 30 min to obtain the mixed culture medium.
[0060] S2, cleaning the bacterial cellulose fermentation component to remove excess bacterial liquid and culture medium, and the resulting product is recorded as the bacterial cellulose component;
[0061] Among them, the cleaning method is:
[0062] The bacterial cellulose fermentation component is immersed in an ethanol aqueous solution with a mass fraction of 75%, and then the bacterial cellulose membrane is transferred to deionized water, stirred and heated at a temperature of 98°C and a stirring speed of 300r / min for 20 minutes, and then immersed in a cooking solution with a mass fraction of sodium hydroxide and sodium tripolyphosphate of 2% and 1% respectively, and cooked at a temperature of 100°C for 120 minutes. After slurrying, it is washed with deionized water until the sodium ion concentration is less than 10 mg / L.
[0063] S3. The bacterial cellulose components are homogenized and beaten to obtain bacterial cellulose slurry, and then the bacterial cellulose slurry is bleached. Finally, the cellulose raw material for triacetate fiber of polarizer is obtained after pulping.
[0064] Among them, the method of homogenizing and beating is:
[0065] First, high shear homogenization is performed at a speed of 15000r / min for 50min, followed by high-pressure homogenization at a pressure of 800bar for 20min. After one high shear homogenization and two high-pressure homogenizations, homogenization beating is completed, and the pulp concentration is controlled at 2%.
[0066] The bleaching method is:
[0067] S3.1. Immerse the bacterial cellulose slurry in a sodium hypochlorite solution with an effective chlorine concentration of 0.3 g / L for 50 min, then wash with deionized water until the pH is less than 9. The resulting solution is recorded as the first fraction.
[0068] S3.2. Add 5 times the weight of deionized water to the first component, boil for 30 minutes, and then wash with deionized water to a pH of 7.5. Then add 2% by weight of hydrogen peroxide and treat for 20 minutes, and wash again with deionized water to a pH of 7.5.
[0069] A cellulose raw material for triacetate fiber for polarizer is prepared by a preparation method of the cellulose raw material for triacetate fiber for polarizer.
[0070] Example 3
[0071] The present embodiment provides a method for preparing a cellulose raw material for polarizer triacetate, and the preparation method is as follows:
[0072] S1. A mixed culture medium was prepared using non-food biomass instead of a carbon source and a nitrogen source, and then Acetobacter xylinum was inoculated into the mixed culture medium at a 10% inoculum rate. The culture was cultured at 28° C. for 72 h using a combination of dynamic stirring fermentation and a biofilm reactor to obtain a bacterial cellulose fermentation component.
[0073] Wherein, the preparation method of mixed culture medium is:
[0074] S1.1. Weigh 22 g of beet molasses, 12 g of corn steep liquor, 2 g of anhydrous citric acid, and 3 g of disodium hydrogen phosphate dodecahydrate into 1000 mL of deionized water. Stir at 500 rpm for 10 min. This is referred to as the basal medium.
[0075] S1.2. Weigh 230 g of orange peel and crush it in a blender. Mix it with 200 mL of deionized water and stir at 600 rpm for 10 min. Filter the mixture through a filter cloth to remove the orange peel residue. The resulting mixture is recorded as the orange peel mixture.
[0076] S1.3. Mix the basal culture medium and the orange peel mixture in an equal volume ratio, stir at 500 r / min for 5 min, add agar powder to adjust the viscosity to 80 mPa·s, then adjust the pH to 4.9 and sterilize at 121°C under a pressure of 0.1 MPa for 30 min to obtain the mixed culture medium.
[0077] S2, cleaning the bacterial cellulose fermentation component to remove excess bacterial liquid and culture medium, and the resulting product is recorded as the bacterial cellulose component;
[0078] Among them, the cleaning method is:
[0079] The bacterial cellulose fermentation component is immersed in an ethanol aqueous solution with a mass fraction of 75%, and then the bacterial cellulose membrane is transferred to deionized water, stirred and heated at a temperature of 98°C and a stirring speed of 300r / min for 20 minutes, and then immersed in a cooking solution with a mass fraction of sodium hydroxide and sodium tripolyphosphate of 2% and 1% respectively, and cooked at a temperature of 90°C for 110 minutes. After slurrying, it is washed with deionized water until the sodium ion concentration is less than 10 mg / L.
[0080] S3. The bacterial cellulose components are homogenized and beaten to obtain bacterial cellulose slurry, and then the bacterial cellulose slurry is bleached. Finally, the cellulose raw material for triacetate fiber of polarizer is obtained after pulping.
[0081] Among them, the method of homogenizing and beating is:
[0082] First, high shear homogenization is performed at a speed of 12000r / min for 40 minutes, followed by high-pressure homogenization at a pressure of 700bar for 18 minutes. After one high shear homogenization and two high-pressure homogenizations, the homogenization beating is completed, and the pulp concentration is controlled at 2%.
[0083] The bleaching method is:
[0084] S3.1. Immerse the bacterial cellulose slurry in a sodium hypochlorite solution with an effective chlorine concentration of 0.22 g / L for 40 min, then wash with deionized water until the pH is less than 9. The resulting solution is recorded as the first fraction.
[0085] S3.2. Add 4 times the weight of deionized water to the first component, boil for 30 minutes, and then wash with deionized water to a pH of 7.0. Then add 2% by weight of hydrogen peroxide and treat for 17 minutes. Wash again with deionized water to a pH of 6.9.
[0086] A cellulose raw material for triacetate fiber for polarizer is prepared by a preparation method of the cellulose raw material for triacetate fiber for polarizer.
[0087] Performance Testing
[0088] The polarizer triacetate cellulose raw materials prepared in Examples 1-3 were labeled as Example 1, Example 2, and Example 3, respectively. The crystallinity and degree of polymerization of Examples 1-3 were then tested, and the obtained data are recorded in the following table.
[0089]
[0090]
[0091] As shown in the data in the above table, the cellulose raw materials for polarizer triacetate cellulose in Examples 1-3 have lower crystallinity and lower degree of polymerization, indicating that the present invention can prepare cellulose raw materials that are beneficial to the production and application of polarizer triacetate cellulose films through a low-cost method.
[0092] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.
[0093] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.
Claims
1. A method for preparing cellulose raw material for polarizer triacetate, characterized in that: The preparation method is: S1. preparing a mixed culture medium using non-food biomass instead of a carbon source and a nitrogen source, then inoculating Acetobacter xylinum into the mixed culture medium at a 10% inoculum rate, and obtaining a bacterial cellulose fermentation component after culturing and fermentation; S2, cleaning the bacterial cellulose fermentation component to remove excess bacterial liquid and culture medium, and the resulting product is recorded as the bacterial cellulose component; S3. The bacterial cellulose components are homogenized and beaten to obtain bacterial cellulose slurry, and then the bacterial cellulose slurry is bleached. Finally, the cellulose raw material for triacetate fiber of polarizer is obtained after pulping.
2. The method for preparing a cellulose raw material for polarizer triacetate according to claim 1, characterized in that: The preparation method of the mixed culture medium in S1 is as follows: S1.
1. Weigh 20-25 g of a carbon source, 10-14 g of a nitrogen source, 1-2 g of anhydrous citric acid, and 3-4 g of disodium hydrogen phosphate dodecahydrate into 1000 mL of deionized water. Stir magnetically and record this as the basal medium. S1.2, weigh 200-250g of orange peel and crush it in a blender, mix it with 200mL of deionized water and stir it evenly, filter it with a filter cloth to remove the orange peel residue, and record the result as orange peel mixture; S1.
3. Mix the basal culture medium and the orange peel mixture in an equal volume ratio. After mixing evenly, add agar powder to adjust the viscosity to 50-100 mPa·s. Then adjust the pH value to 4.8-5.0 and sterilize under high pressure to obtain the mixed culture medium.
3. The method for preparing a cellulose raw material for polarizer triacetate according to claim 2, characterized in that: The carbon source component in S1.1 is one or more of straw sugar, sugarcane molasses, beet molasses and cassava starch, the nitrogen source component in S1.1 is one or more of cottonseed cake, wheat bran, corn steep liquor, yeast extract and soybean meal, and the magnetic stirring method in S1.1 is stirring at a stirring speed of 400-500 r / min for 10 minutes.
4. The method for preparing a cellulose raw material for polarizer triacetate according to claim 2, characterized in that: The method for uniform stirring in S1.2 is stirring at a stirring speed of 500-600 r / min for 10 minutes, the method for uniform mixing in S1.3 is stirring at a stirring speed of 500-600 r / min for 5 minutes, and the method for high-pressure sterilization in S1.3 is sterilization at 121°C under a pressure of 0.1 MPa for 30 minutes.
5. The method for preparing a cellulose raw material for polarizer triacetate according to claim 1, characterized in that: The culture and fermentation conditions in S1 are a method combining dynamic stirring fermentation and a biofilm reactor. The culture temperature and time of the culture and fermentation in S1 are 25-30° C. and 48-96 h, respectively.
6. The method for preparing a cellulose raw material for polarizer triacetate according to claim 1, characterized in that: The cleaning method in S2 is: The bacterial cellulose fermentation component is immersed in an ethanol aqueous solution with a mass fraction of 75%, and then the bacterial cellulose membrane is transferred to deionized water, stirred and heated at a temperature of 98°C and a stirring speed of 200-300 r / min for 20 minutes, and then immersed in a cooking liquid with a mass fraction of sodium hydroxide and sodium tripolyphosphate of 2% and 1% respectively, and cooked at a temperature of 80-100°C for 90-120 minutes. After slurrying, it is washed with deionized water until the sodium ion concentration is less than 10 mg / L.
7. The method for preparing a cellulose raw material for polarizer triacetate according to claim 1, characterized in that: The homogenizing and beating method in S3 is: First, high shear homogenization is performed at a speed of 8000-15000r / min for 30-50min, followed by high-pressure homogenization at a pressure of 500-800bar for 15-20min. After one high shear homogenization and two high-pressure homogenizations, homogenization and beating are completed, and the pulp concentration is controlled at 1-2%.
8. The method for preparing a cellulose raw material for polarizer triacetate according to claim 1, characterized in that: The bleaching method in S3 is: S3.
1. Immerse the bacterial cellulose slurry in a sodium hypochlorite solution for 30-50 minutes, then wash with deionized water until the pH is less than 9. The resulting slurry is referred to as the first fraction. S3.
2. Add 3-5 times the weight of deionized water to the first component, boil for 30 minutes, and then wash with deionized water to a pH of 6.5-7.
5. Then add 2% by weight of hydrogen peroxide and treat for 15-20 minutes, and wash again with deionized water to a pH of 6.5-7.
5.
9. The method for preparing a cellulose raw material for polarizer triacetate according to claim 8, characterized in that: The effective chlorine concentration of the sodium hypochlorite solution in S3.1 is 0.15-0.3 g / L.
10. A cellulose raw material for polarizer triacetate, characterized in that: The cellulose raw material for polarizer triacetate is prepared by the preparation method for a cellulose raw material for polarizer triacetate according to any one of claims 1 to 9.