Preparation method of degreasing cotton paper not prone to pollution

Abstract

The invention provides a preparation method of absorbent cotton paper not prone to pollution, and relates to the technical field of absorbent cotton. The preparation method provided by the invention comprises the following steps: pulping degreasing cotton in a modified solution to prepare fiber slurry; filtering primary cotton paper from the fiber pulp by using a forming net, and drying the primary cotton paper to obtain secondary cotton paper with the water content of 10-20%; soaking and modifying the secondary cotton paper in the pine needle extracting solution, taking out and drying to obtain the absorbent cotton paper with the water content of 3-8%. According to the invention, the degreasing cotton fiber is subjected to surface modification and then attached with the pine leaf extract, so that the water absorption and water locking performance of the degreasing cotton fiber can be improved, and the overall corrosion resistance and structural stability of the degreasing cotton paper can be further improved.

Description

Technical Field

[0001] The invention relates to the technical field of absorbent cotton, in particular to a method for preparing absorbent cotton paper which is not easy to be contaminated. Background Art

[0002] After chemical treatment of cotton fibers to remove oil components, absorbent cotton, whose main component is cellulose, is obtained. It has good water absorption, flexibility and air permeability. After the absorbent cotton fibers are made into absorbent cotton paper, the application of absorbent cotton in the fields of medicine, hygiene and personal care can be greatly improved.

[0003] In the prior art, absorbent cotton is mainly used as raw material in the process of preparing absorbent cotton paper. The absorbent cotton is combed into a uniform fiber web, and the fiber web is formed into a sheet by pressure. The moisture in the fiber web is removed by drying to form absorbent cotton paper.

[0004] However, after the absorbent cotton paper is prepared in the above-mentioned prior art, it is necessary to quickly disinfect and package it in a sterile environment, otherwise the absorbent cotton paper is easily contaminated by the external environment. In addition, the absorbent cotton paper is easily affected by light and ambient temperature during long-term storage and ages, which leads to breakage of the absorbent cotton fibers and reduced water absorption. Therefore, it is urgent to provide a solution to solve the above problems. Summary of the invention

[0005] The object of the present invention is to provide a method for preparing absorbent cotton paper which is not easy to be contaminated.

[0006] The invention provides a method for preparing non-polluting absorbent cotton paper, comprising the following steps: beating the absorbent cotton in a modified solution to prepare a fiber slurry; using a forming net to filter out primary cotton paper from the fiber slurry, and drying the primary cotton paper to prepare secondary cotton paper with a water content of 10-20%; soaking the secondary cotton paper in a Pinus lanceolata leaf extract to modify it, taking it out and drying it to prepare absorbent cotton paper with a water content of 3-8%.

[0007] The preparation method provided by the present invention is beneficial to fully modify the surface of the absorbent cotton fibers after immersing the absorbent cotton in a modified solution and performing a pulping treatment, and can form a uniform and dense protective film on the surface of the absorbent cotton fibers, inhibit the growth of microorganisms and improve the stability and storage performance of the fibers. In addition, after the surface modification treatment, it is beneficial to adhere to the surface of the absorbent cotton fibers, and then the absorbent cotton leaf extract and the protective film form a composite membrane structure, which can improve the water absorption and water locking performance of the absorbent cotton fibers, and can also further improve the overall antiseptic and structural stability of the absorbent cotton paper.

[0008] Optionally, the preparation method of the Pinus tabulaeformis leaf extract includes: steaming the Pinus tabulaeformis leaf powder in boiling water for 1-2 hours to obtain mature powder, mixing the mature powder with a composite bacterial liquid, fermenting and sterilizing, collecting the fermentation liquid and the fermentation residue; keeping the fermentation residue warm in deionized water at 90-100°C for 1-2 hours, separating the water extract, combining the water extract and the fermentation liquid and concentrating them under an inert atmosphere to obtain the Pinus tabulaeformis leaf extract.

[0009] Optionally, when the cooked powder is mixed with the composite bacterial liquid, the composite bacterial liquid includes a fermentation base liquid and a fermentation mixed bacteria inoculated into the fermentation base liquid, and the fermentation mixed bacteria includes lactic acid bacteria and yeast.

[0010] Optionally, the fermentation base liquid includes a sugar source, and the sugar source includes at least one of glucose and maltose.

[0011] Optionally, the lactobacillus is Lactobacillus CGMCC NO.0843.

[0012] Optionally, the yeast is CGMCC NO.27154.

[0013] Optionally, the inoculation concentration of the fermentation mixed bacteria in the fermentation base liquid is 10 6 -10 7 CFU / mL.

[0014] Optionally, the ratio of the number of live bacteria of lactobacillus to that of yeast in the fermentation mixture is (0.5-1):1.

[0015] Optionally, after the cooked powder is mixed with the composite bacterial solution, it is fermented in an anaerobic environment at 25-37° C. and a pH of 5-6 for 70-74 hours and then sterilized; the sterilization includes at least one of high temperature sterilization and ultraviolet sterilization.

[0016] Optionally, the Pinus lanceolata leaf powder is sieved through a 100-200 mesh sieve and then steamed in boiling water.

[0017] Optionally, the water content of the Pinus lanceolata leaf powder is 5-10%.

[0018] Optionally, the mixing ratio of the number of live bacteria in the composite bacterial liquid to the cooked powder is 10 6 -10 7 CFU / g.

[0019] Optionally, the volume of the Pinus lanceolata leaf extract is 1 / 4-1 / 3 of the volume of the water extract and the fermentation liquid after mixing.

[0020] Optionally, when the absorbent cotton is pulped in a modified solution, the modified solution comprises 5-10% by mass of active polyphenols, and the active polyphenols comprise at least one of tea polyphenols, anthocyanidins, resveratrol and curcumin.

[0021] Optionally, the absorbent cotton is ultrasonically mixed in the modified solution for 10-15 minutes, and then beaten at a rotation speed of 2000-3000 rpm and a gap of 0.1-0.5 mm for 30-45 minutes to prepare a fiber slurry.

[0022] Optionally, the second-grade cotton paper is soaked in a Pinus lanceolata leaf extract at 30-35° C. for 15-20 minutes and then taken out and dried to produce third-grade cotton paper with a moisture content of 20-25%. The third-grade cotton paper is bleached in a bleaching solution and then dried to produce absorbent cotton paper with a moisture content of 3-8%.

[0023] Optionally, the preparation method of the absorbent cotton comprises: combing the cotton fibers after impurities are removed to obtain cotton linters; degreasing the cotton linters in an alkali solution and then bleaching them to obtain absorbent cotton. After the cotton fibers are removed from the impurities and combed, the impurities in the fibers can be removed and the fibers can be combed to make them more uniform and neat, which can greatly improve the purity and fiber uniformity of the cotton fibers. Degreasing and bleaching the cotton linters can remove natural oils, waxes and pigments in the cotton fibers, remove fatty acid salts and glycerol from the fiber surface through saponification reaction, further improve the purity and hydrophilicity of the fibers, and bleaching can also improve the whiteness and chemical adsorption performance of the absorbent cotton fibers. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. Unless otherwise defined, the technical terms or scientific terms used herein should be the common meanings understood by people with general skills in the field to which the present invention belongs.

[0025] The present invention provides a method for preparing absorbent cotton paper which is not easy to be contaminated, comprising the following steps:

[0026] S1, beating the absorbent cotton in a modified solution to prepare a fiber slurry;

[0027] S2, using a forming net to filter out primary cotton paper from the fiber slurry;

[0028] S3, drying the primary cotton paper to obtain secondary cotton paper with a moisture content of 10-20%;

[0029] S4, soaking the secondary cotton paper in Pinus tabebuia leaf extract to modify it, taking it out and drying it to obtain absorbent cotton paper with a moisture content of 3-8%.

[0030] In some embodiments, the method for preparing the absorbent cotton used in step S1 includes:

[0031] S0.1, carding the cotton fibers after impurities removal to obtain cotton linters;

[0032] S0.2. Degrease cotton linters in alkali solution and then bleach them to obtain absorbent cotton.

[0033] In fact, in the process of executing step S0.1, a mechanical impurity removal method can be used to remove impurities from cotton fibers. First, a cotton cleaner is used to perform preliminary processing on the cotton fibers. The beaters in the cotton cleaner rotate at high speed to hit and tear the cotton fibers, thereby separating impurities from the cotton fibers, and the dust grid is used to perform a preliminary screening of the impurities.

[0034] In fact, in the process of executing step S0.1, after using a cotton cleaning machine to perform preliminary screening and impurity removal on the cotton fibers, a cotton carding machine can also be used to perform secondary impurity removal and combing on the cotton fibers, which can further remove smaller impurities and short fibers in the cotton fibers, significantly improving the efficiency and cleanliness of impurity removal on the cotton fibers. In addition, the needle clothing on the cylinder in the cotton carding machine can comb and shape the cotton fibers.

[0035] In fact, in the process of executing step S0.1, when using a cotton cleaner and a cotton carding machine to remove impurities and comb the cotton fibers, technical personnel in this field can adaptively and reasonably adjust the parameters of the cotton cleaner and the cotton carding machine according to the processing conditions, such as adjusting the speed of the beaters in the cotton cleaner, the dust grid spacing, and the spacing between the cylinder and the cover plate of the cotton cleaner. In addition, the parameters can also be adjusted according to the processing amount and impurity content of the cotton fibers to achieve the necessary removal of impurities and combing of the cotton fibers.

[0036] Specifically, during the execution of step S0.2, the cotton linters are soaked in an alkali solution so that the alkali reacts with the oil in the cotton linters to undergo a saponification reaction, thereby converting the water-insoluble oil into a water-soluble fatty acid salt, thereby degreasing the cotton linters. Specifically, the alkali solution used includes at least one of a sodium hydroxide solution and a potassium hydroxide solution, and the mass fraction of the solute in the alkali solution is 5-10%.

[0037] Specifically, during the execution of step S0.2, after the cotton linters are soaked in the alkali solution, a surfactant can be added to the alkali solution to reduce the surface tension, thereby making it easier for the grease in the cotton linters to separate from the surface of the cotton fibers. In addition, when faced with some cotton linters with a tight texture and deep grease penetration, the degreasing efficiency and degreasing rate can be significantly improved by adding a surfactant.

[0038] Specifically, during the execution of step S0.2, the cotton linters are immersed in an alkali solution and stirred at 50-80°C for 0.5-2h for degreasing. In fact, by performing a heating treatment during the degreasing process, the rate of the saponification reaction can be effectively increased, and the oil components can be better decomposed, thereby increasing the degreasing rate of the cotton linters.

[0039] Specifically, during the execution of step S0.2, after the cotton linters are degreased in an alkali solution, the degreased cotton linters are taken out and the surface of the cotton linters is rinsed with deionized water, thereby removing the alkali solution remaining on the surface of the cotton linters and the generated fatty acid salts. In fact, during the process of using deionized water for surface rinsing, the washing liquid is neutral, thereby ensuring that the pH value of the cotton linters is restored to near neutral.

[0040] Specifically, during the execution of step S0.2, the degreased cotton linters are bleached in a bleaching solution, which helps to improve the surface whiteness of the cotton linters after degreasing, improves the safety when used in the medical and sanitary fields, and the white appearance can enhance the visual sense of neatness. The bleaching treatment can also remove impurities and dirt on the surface of the absorbent cotton, making the pores of the absorbent cotton fibers smoother and improving the adsorption capacity of the absorbent cotton.

[0041] Specifically, during the execution of step S0.2, the defatted cotton linters are stirred in the bleaching solution to react, thereby improving the bleaching efficiency and bleaching uniformity. In addition, the bleaching time is controlled to be 30-60 minutes to avoid over-bleaching of the cotton linters by the bleaching solution. In fact, during the bleaching process, the temperature of the bleaching solution can be controlled at 20-30° C. Within this temperature range, the reaction efficiency can be effectively balanced, and damage to the cotton linters and over-bleaching can be avoided.

[0042] Specifically, during the execution of step S0.2, when the degreased cotton linters are bleached in a bleaching solution, the bleaching solution used includes at least one of hydrogen peroxide and sodium hypochlorite. Specifically, the concentration of hydrogen peroxide and sodium hypochlorite in the bleaching solution may be 1-5wt%. Specifically, after the bleaching treatment of the cotton linters is completed using the bleaching solution, the cotton linters are rinsed with deionized water to remove the residual bleaching components and the generated decomposition products, thereby stabilizing the bleaching effect.

[0043] In some embodiments, during the execution of step S1, the modified solution used includes 5-10% active polyphenols by mass, and the solute of the modified solution is deionized water. By soaking the absorbent cotton in the modified solution, the active polyphenols can be promoted to penetrate into the absorbent cotton fibers and on the surface of the absorbent cotton fibers, and a uniform and dense polyphenol protective layer is formed on the surface of the absorbent cotton fibers, which can effectively improve the protectiveness of the cotton fibers. In addition, the active polyphenols also have good antibacterial and antioxidant properties, which can greatly improve the storage stability and anti-pollution properties of the absorbent cotton paper.

[0044] Specifically, the active polyphenols in the modified solution include at least one of tea polyphenols, anthocyanins, resveratrol and curcumin. In fact, by selecting different active polyphenols and controlling the mixing ratio of the active polyphenols in the modified solution, the structure of the polyphenol protective layer on the surface of the absorbent cotton fiber can be regulated, thereby regulating the storage performance and anti-pollution property of the absorbent cotton paper. More specifically, the active polyphenols in the modified solution are a mixture of tea polyphenols and anthocyanins in a mass ratio of 1:1.

[0045] In some embodiments, during the execution of step S1, the absorbent cotton is ultrasonically mixed in the modified solution for 10-15 minutes, and then beaten at a speed of 2000-3000 rpm and a gap of 0.1-0.5 mm for 30-45 minutes to prepare a fiber slurry. In fact, by ultrasonically mixing the absorbent cotton with the modified solution, the cavitation effect of ultrasound can be utilized to promote the adsorption of active polyphenols on the surface of active cotton fibers, and the mixing uniformity can also be improved, which is beneficial for beating.

[0046] Specifically, the pulping process needs to be carried out in a disc-refining pulper, and the pulping pressure is controlled to be 0.1-0.3 MPa. In fact, by pulping the absorbent cotton, the active polyphenols can be further combined with the absorbent cotton fibers, and the absorbent cotton fibers are subjected to mechanical forces during the pulping process, resulting in physical changes such as cutting, which is beneficial to the preparation of cotton paper.

[0047] In some embodiments, during the execution of step S2, a forming net with a mesh size of 80-120 is used to filter out the fiber slurry. When the cotton fibers are completely covered on the surface of the forming net, the forming net is removed from the fiber slurry and allowed to stand until no strands of liquid flow down, and then the primary cotton paper is peeled off from the surface of the forming net.

[0048] In some embodiments, during the process of performing step S3, after the primary tissue paper is dried, the evaporation of water will lead to the enhancement of hydrogen bonding between cotton fibers, thereby improving the mechanical strength and structural stability of the tissue paper. In addition, by controlling the moisture content of the obtained secondary tissue paper, the shrinkage and deformation of the tissue paper due to drastic water loss can be avoided.

[0049] In some embodiments, during the execution of step S3, the primary tissue paper is placed in a nitrogen atmosphere at 40-45° C. for drying, which can avoid surface oxidation of the primary tissue paper caused by oxidative gases, thereby improving the surface quality of the secondary tissue paper. In addition, drying at a relatively low temperature is beneficial to controlling the water loss rate of the primary tissue paper.

[0050] In some embodiments, during the execution of step S4, the method for preparing the Pinus lanceolata leaf extract comprises the following steps:

[0051] Y1. Steam the Pinus tabulaeformis leaf powder in boiling water for 1-2 hours to obtain a cooked powder;

[0052] Y2, mixing the mature powder with the composite bacterial solution, fermenting and sterilizing, collecting the fermentation solution and the fermentation residue; Y3, keeping the fermentation residue in deionized water at 90-100°C for 1-2 hours and separating the water extract;

[0053] Y4. The water extract and the fermentation liquid are combined and concentrated under an inert atmosphere to obtain a Pinus lanceolata leaf extract.

[0054] In fact, after executing step Y1, steaming the Pinus tabulaeformis leaf powder in boiling water is beneficial to the activation and transformation of the active substances in the Pinus tabulaeformis leaf powder. In addition, it avoids the direct dissolution of the active substances in the solvent environment, destroys the cell wall structure in the Pinus tabulaeformis leaf powder, and can also sterilize the Pinus tabulaeformis leaf powder simultaneously.

[0055] In some embodiments, during the execution of step Y1, the pine leaf powder is sieved through a 100-200 mesh screen and then steamed in boiling water. In fact, the use of pine leaf powder is beneficial to increase its specific surface area, thereby increasing the dissolution area and dissolution rate of the effective ingredients, and can also improve the post-processing efficiency. In addition, the pine leaf powder used can be made from fresh pine leaves, washed, and then naturally dried or mechanically dried to obtain pine leaves with a water content of 5-10%, and then crushed.

[0056] In some embodiments, during the execution of step Y1, the Pinus tabulaeformis leaf powder is spread evenly in a steamer, and the thickness of the Pinus tabulaeformis leaf powder is controlled to be 8-10 mm. The steamer containing the Pinus tabulaeformis leaf powder is placed on top of boiling water at 100°C, and the boiling water is continuously heated to steam the Pinus tabulaeformis leaf powder.

[0057] In some embodiments, during the execution of step Y2, the composite bacterial liquid includes a fermentation base liquid and a fermentation mixed bacteria inoculated in the fermentation base liquid, and the fermentation mixed bacteria include lactic acid bacteria and yeast. In fact, fermentation of the mature powder by fermentation mixed bacteria is conducive to degrading macromolecules such as polysaccharides in Pinus tabulaeformis leaves into small molecular active substances, and can further remove plant cell walls. In addition, the organic acids and alcohols produced during the fermentation process can be esterified with the active substances in Pinus tabulaeformis leaves to obtain esterification products.

[0058] In some embodiments, during the execution of step Y2, the fermentation base liquid used includes a sugar source and deionized water for dissolving the sugar source, and the sugar source includes at least one of glucose and maltose. In fact, by pre-configuring the fermentation base liquid, a nutrient matrix can be provided for the metabolic activities of the fermentation mixed bacteria for their growth and metabolism.

[0059] In some embodiments, during the execution of step Y2, the lactobacillus is lactobacillus CGMCC NO.0843 and the yeast is yeast CGMCC NO.27154. In fact, the inoculation concentration of the fermentation mixed bacteria in the fermentation base liquid is 10 6 -10 7 CFU / mL, and the mixing ratio of the number of live bacteria in the composite bacterial solution and the mature powder is 10 6 -10 7 CFU / g. Specifically, the ratio of the number of live lactobacilli to that of live yeast in the fermentation mixture is (0.5-1):1.

[0060] In some embodiments, during the process of performing step Y2, the cooked powder is mixed with the composite bacterial solution, and then fermented in an anaerobic environment at 25-37° C. and pH 5-6 for 70-74 hours before sterilization. Specifically, the sterilization includes at least one of high temperature sterilization and ultraviolet sterilization.

[0061] In some embodiments, during the execution of step Y4, the inert atmosphere used is an argon atmosphere, and the volume of the Pinus lappa leaf extract is 1 / 4-1 / 3 of the volume of the mixed water extract and the fermentation liquid.

[0062] In some embodiments, during the execution of step S4, the secondary cotton paper is soaked in a Pinus lanceolata leaf extract at 30-35° C. for 15-20 minutes and then taken out and dried to produce tertiary cotton paper with a moisture content of 20-25%. The tertiary cotton paper is bleached in a bleaching solution and then dried to produce absorbent cotton paper with a moisture content of 3-8%.

[0063] Preparation Example 1

[0064] This preparation example 1 provides a method for preparing absorbent cotton, comprising the following steps:

[0065] S0.1, feeding the cotton fibers evenly into the cotton feeding port of the cotton cleaning machine, setting the beater speed in the cotton cleaning machine to 800rpm, the dust grid spacing to 3mm, and the spacing between the cylinder and the cover plate to 0.18mm, feeding the cotton fibers passing through the cotton cleaning machine into the carding machine, the licker-in roller in the carding machine rotates at a speed of 900rpm, and the cylinder speed is 350rpm, the cotton fibers are opened and carded, and cotton linters are obtained;

[0066] S0.2. Immerse the cotton linters in a 5% by mass aqueous solution of sodium hydroxide, stir and react at 60°C for 1 hour, then take out the cotton linters, and continuously rinse the cotton linters with deionized water until the pH of the rinse liquid is neutral. Then, immerse the defatted cotton linters in a 3% by mass aqueous solution of sodium hypochlorite, stir and react at 25°C and bleach for 40 minutes, then take out the cotton linters, and rinse the cotton linters with deionized water to obtain absorbent cotton.

[0067] Preparation Example 2

[0068] This preparation example 2 provides a method for preparing a Pinus lanceolata leaf extract, comprising the following steps:

[0069] Y1. Spread the pine leaf powder (water content 8 wt%) passed through a 100-mesh sieve in a steamer, and control the loose paving thickness of the pine leaf powder to be 10 mm. Then, place the steamer 15 cm away from the surface of boiling water, continue to heat the boiling water, steam the pine leaf powder for 2 h, take out the steamer, and cool it to room temperature to obtain a cooked powder;

[0070] Y2. Lactobacillus CGMCC NO.0843 and yeast CGMCC NO.27154 were inoculated into a fermentation base solution (a 10 wt % glucose aqueous solution) to prepare a composite bacterial solution, and the number of live bacteria of Lactobacillus CGMCC NO.0843 in the composite bacterial solution was 10 7 CFU / mL, the number of live bacteria of yeast CGMCC NO.27154 is 10 7 CFU / mL; the matured powder and the composite bacterial solution were uniformly mixed at a mass volume ratio of 1g / mL, and fermented in an anaerobic environment at 32°C and pH 5 for 72 hours, and then sterilized by ultraviolet light to separate the fermentation solution and the fermentation residue;

[0071] Y3. Stir and mix the fermentation residue with deionized water at a volume ratio of 1:10, heat to 95° C. and keep warm for 2 hours, then filter and separate, wash the filtrate with deionized water, and combine the washing liquid and the filtrate to obtain a water extract;

[0072] Y4. Combine the water extract and the fermentation liquid, mix them by ultrasonication, and concentrate them under an argon atmosphere at 60°C to obtain a Pinus lanceolata leaf extract; wherein the volume of the Pinus lanceolata leaf extract is 1 / 4 of the mixed volume of the water extract and the fermentation liquid.

[0073] Preparation Example 3

[0074] This preparation example 3 provides a method for preparing a Pinus lanceolata leaf extract, comprising the following steps:

[0075] Y1. Prepare pine leaf powder with a water content of 8% and passed through a 100-mesh sieve;

[0076] Y2. Lactobacillus CGMCC NO.0843 and yeast CGMCC NO.27154 were inoculated into a fermentation base solution (a 10 wt % glucose aqueous solution) to prepare a composite bacterial solution, and the number of live bacteria of Lactobacillus CGMCC NO.0843 in the composite bacterial solution was 10 7 CFU / mL, the number of live bacteria of yeast CGMCC NO.27154 is 10 7 CFU / mL; after uniformly mixing the Pinus lanceolata leaf powder and the composite bacterial solution at a mass volume ratio of 1 g / mL, fermenting in an anaerobic environment at 32°C and pH 5 for 72 hours, ultraviolet sterilization was performed and the fermentation solution and the fermentation residue were separated;

[0077] Y3. Stir and mix the fermentation residue with deionized water at a volume ratio of 1:10, heat to 95° C. and keep warm for 2 hours, then filter and separate, wash the filtrate with deionized water, and combine the washing liquid and the filtrate to obtain a water extract;

[0078] Y4. Combine the water extract and the fermentation liquid, mix them by ultrasonication, and concentrate them under an argon atmosphere at 60°C to obtain a Pinus lanceolata leaf extract; wherein the volume of the Pinus lanceolata leaf extract is 1 / 4 of the mixed volume of the water extract and the fermentation liquid.

[0079] Preparation Example 4

[0080] This preparation example 4 provides a method for preparing a Pinus lanceolata leaf extract, comprising the following steps:

[0081] Y1. Spread the pine leaf powder (water content 8%) passed through a 100-mesh sieve in a steamer, and control the loose paving thickness of the pine leaf powder to be 10 mm. Then, place the steamer 15 cm away from the surface of boiling water, continue to heat the boiling water, steam the pine leaf powder for 2 hours, take out the steamer, and cool it to room temperature to obtain a cooked powder;

[0082] Y2. Inoculate Lactobacillus CGMCC NO.16136 and Saccharomyces CGMCC NO.27154 into the fermentation base liquid (10% by mass glucose solution) to prepare a composite bacterial liquid, and the number of live bacteria of Lactobacillus CGMCC NO.16136 in the composite bacterial liquid is 10 7 CFU / mL, the number of live bacteria of yeast CGMCC NO.27154 is 10 7CFU / mL; the matured powder and the composite bacterial solution were uniformly mixed at a mass volume ratio of 1g / mL, and fermented in an anaerobic environment at 32°C and pH 5 for 72 hours, and then sterilized by ultraviolet light to separate the fermentation solution and the fermentation residue;

[0083] Y3. Stir and mix the fermentation residue with deionized water at a volume ratio of 1:10, heat to 95° C. and keep warm for 2 hours, then filter and separate, wash the filtrate with deionized water, and combine the washing liquid and the filtrate to obtain a water extract;

[0084] Y4. Combine the water extract and the fermentation liquid, mix them by ultrasonication, and concentrate them under an argon atmosphere at 60°C to obtain a Pinus lanceolata leaf extract; wherein the volume of the Pinus lanceolata leaf extract is 1 / 4 of the mixed volume of the water extract and the fermentation liquid.

[0085] Preparation Example 5

[0086] This preparation example 5 provides a method for preparing a Pinus lanceolata leaf extract, comprising the following steps:

[0087] Y1. Spread the pine leaf powder (water content 8%) passed through a 100-mesh sieve in a steamer, and control the loose paving thickness of the pine leaf powder to be 10 mm. Then, place the steamer 15 cm away from the surface of boiling water, continue to heat the boiling water, steam the pine leaf powder for 2 hours, take out the steamer, and cool it to room temperature to obtain a cooked powder;

[0088] Y2. Lactobacillus CGMCC NO.0843 and yeast CGMCC NO.23732 were inoculated into the fermentation base liquid (10% by mass glucose solution) to prepare a composite bacterial liquid, and the number of live bacteria of Lactobacillus CGMCC NO.0843 in the composite bacterial liquid was 10 7 CFU / mL, the number of live bacteria of yeast CGMCC NO.23732 is 10 7 CFU / mL; the matured powder and the composite bacterial solution were uniformly mixed at a mass volume ratio of 1g / mL, and fermented in an anaerobic environment at 32°C and pH 5 for 72 hours, and then sterilized by ultraviolet light to separate the fermentation solution and the fermentation residue;

[0089] Y3. Stir and mix the fermentation residue with deionized water at a volume ratio of 1:10, heat to 95° C. and keep warm for 2 hours, then filter and separate, wash the filtrate with deionized water, and combine the washing liquid and the filtrate to obtain a water extract;

[0090] Y4. Combine the water extract and the fermentation liquid, mix them by ultrasonication, and concentrate them under an argon atmosphere at 60°C to obtain a Pinus lanceolata leaf extract; wherein the volume of the Pinus lanceolata leaf extract is 1 / 4 of the mixed volume of the water extract and the fermentation liquid.

[0091] Preparation Example 6

[0092] This preparation example 6 provides a method for preparing a Pinus lanceolata leaf extract, comprising the following steps:

[0093] Y1. Spread the pine leaf powder (water content 8%) passed through a 100-mesh sieve in a steamer, and control the loose paving thickness of the pine leaf powder to be 10 mm. Then, place the steamer 15 cm away from the surface of boiling water, continue to heat the boiling water, steam the pine leaf powder for 2 hours, take out the steamer, and cool it to room temperature to obtain a cooked powder;

[0094] Y2. Stir and mix the mature powder and deionized water in a volume ratio of 1:10, heat to 95°C and keep warm for 2 hours, then filter and separate, wash the filtrate with deionized water, combine the washing liquid and the filtrate to obtain a water extract, and concentrate the water extract under an argon atmosphere at 60°C to a Pinus lanceolata leaf extract of 1 / 4 of the volume of the water extract.

[0095] Preparation Example 7

[0096] This preparation example 7 provides a method for preparing a Pinus lanceolata leaf extract, comprising the following steps:

[0097] Y1. Mix Pinus tabulaeformis leaf powder (water content 8%) passed through a 100-mesh sieve with deionized water in a volume ratio of 1:10, heat to 95°C and keep warm for 2 hours, then filter and separate, wash the filtrate with deionized water, combine the washing liquid and the filtrate to obtain a water extract, and concentrate the water extract under an argon atmosphere at 60°C to a Pinus tabulaeformis leaf extract of 1 / 4 of the volume of the water extract.

[0098] Example 1

[0099] This embodiment 1 provides a method for preparing absorbent cotton paper, comprising the following steps:

[0100] S1. The absorbent cotton prepared in Preparation Example 1 was ultrasonically mixed with a modified solution (8% tea polyphenol solution by mass, with a mass ratio of absorbent cotton to tea polyphenol of 1:0.3) for 10 min, and then the mixture of the absorbent cotton and the modified solution was beaten at 0.2 MPa for 40 min at a speed of 2500 rpm and a gap of 0.3 mm using a disc beater to obtain a fiber slurry;

[0101] S2. Use a 100-mesh forming net to filter out the fiber slurry. When the absorbent cotton fibers are completely covered on the surface of the forming net, remove the forming net from the fiber slurry and let it stand until no strands of liquid flow down, then peel off the primary cotton paper from the surface of the forming net;

[0102] S3, transferring the primary tissue paper to an atmosphere furnace and drying it in a nitrogen atmosphere at 40°C to produce secondary tissue paper with a moisture content of 15%;

[0103] S4. After soaking the secondary cotton paper in the Pinus tabulaeformis leaf extract (30° C.) prepared in Preparation Example 2 for 15 minutes, the secondary cotton paper is taken out and dried to obtain the tertiary cotton paper with a moisture content of 22%. The tertiary cotton paper is then soaked in a sodium hypochlorite aqueous solution for 30 minutes for bleaching treatment, and then dried to obtain the absorbent cotton paper with a moisture content of 5%.

[0104] Example 2

[0105] This embodiment 2 provides a method for preparing absorbent cotton paper, comprising the following steps:

[0106] S1. The absorbent cotton prepared in Preparation Example 1 was ultrasonically mixed with a modified solution (8% by mass anthocyanin solution, mass ratio of absorbent cotton to anthocyanin was 1:0.3) for 10 min, and then the mixture of absorbent cotton and the modified solution was beaten at 0.2 MPa for 40 min at a speed of 2500 rpm and a gap of 0.3 mm using a disc beater to obtain a fiber slurry;

[0107] S2. Use a 100-mesh forming net to filter out the fiber slurry. When the absorbent cotton fibers are completely covered on the surface of the forming net, remove the forming net from the fiber slurry and let it stand until no strands of liquid flow down, then peel off the primary cotton paper from the surface of the forming net;

[0108] S3, transferring the primary tissue paper to an atmosphere furnace and drying it in a nitrogen atmosphere at 40°C to produce secondary tissue paper with a moisture content of 13%;

[0109] S4. After soaking the secondary cotton paper in the Pinus tabulaeformis leaf extract (30° C.) prepared in Preparation Example 2 for 15 minutes, the secondary cotton paper is taken out and dried to obtain the tertiary cotton paper with a moisture content of 23%. The tertiary cotton paper is then soaked in a sodium hypochlorite aqueous solution for 30 minutes for bleaching treatment, and then dried to obtain the absorbent cotton paper with a moisture content of 4%.

[0110] Example 3

[0111] This embodiment 3 provides a method for preparing absorbent cotton paper, comprising the following steps:

[0112] S1. The absorbent cotton prepared in Preparation Example 1 was ultrasonically mixed with a modified solution (4% by mass of anthocyanin, 4% by mass of tea polyphenols, and the mass ratio of the absorbent cotton, anthocyanin, and tea polyphenols was 1:0.15:0.15) for 10 minutes, and then the mixture of the absorbent cotton and the modified solution was beaten at 0.2 MPa for 40 minutes at a speed of 2500 rpm and a gap of 0.3 mm using a disc beater to obtain a fiber slurry;

[0113] S2. Use a 100-mesh forming net to filter out the fiber slurry. When the absorbent cotton fibers are completely covered on the surface of the forming net, remove the forming net from the fiber slurry and let it stand until no strands of liquid flow down, then peel off the primary cotton paper from the surface of the forming net;

[0114] S3, transferring the primary tissue paper to an atmosphere furnace and drying it in a nitrogen atmosphere at 40°C to produce secondary tissue paper with a moisture content of 17%;

[0115] S4. After soaking the secondary cotton paper in the Pinus tabulaeformis leaf extract (30° C.) prepared in Preparation Example 2 for 15 minutes, the secondary cotton paper is taken out and dried to obtain the tertiary cotton paper with a moisture content of 21%. The tertiary cotton paper is then soaked in a sodium hypochlorite aqueous solution for 30 minutes for bleaching treatment, and then dried to obtain the absorbent cotton paper with a moisture content of 6%.

[0116] Example 4

[0117] This embodiment 4 provides a method for preparing absorbent cotton paper, comprising the following steps:

[0118] S1. The absorbent cotton prepared in Preparation Example 1 was ultrasonically mixed with a modified solution (4% by mass of anthocyanin, 4% by mass of tea polyphenols, and the mass ratio of the absorbent cotton, anthocyanin, and tea polyphenols was 1:0.15:0.15) for 10 minutes, and then the mixture of the absorbent cotton and the modified solution was beaten at 0.2 MPa for 40 minutes at a speed of 2500 rpm and a gap of 0.3 mm using a disc beater to obtain a fiber slurry;

[0119] S2. Use a 100-mesh forming net to filter out the fiber slurry. When the absorbent cotton fibers are completely covered on the surface of the forming net, remove the forming net from the fiber slurry and let it stand until no strands of liquid flow down, then peel off the primary cotton paper from the surface of the forming net;

[0120] S3, transferring the primary tissue paper to an atmosphere furnace and drying it in a nitrogen atmosphere at 40°C to produce secondary tissue paper with a moisture content of 16%;

[0121] S4. After soaking the secondary cotton paper in the Pinus tabulaeformis leaf extract (30° C.) prepared in Preparation Example 3 for 15 minutes, the secondary cotton paper is taken out and dried to obtain the tertiary cotton paper with a moisture content of 22%. The tertiary cotton paper is then soaked in a sodium hypochlorite aqueous solution for 30 minutes for bleaching treatment, and then dried to obtain the absorbent cotton paper with a moisture content of 5%.

[0122] Example 5

[0123] This embodiment 5 provides a method for preparing absorbent cotton paper, comprising the following steps:

[0124] S1. The absorbent cotton prepared in Preparation Example 1 was ultrasonically mixed with a modified solution (4% by mass of anthocyanin, 4% by mass of tea polyphenols, and the mass ratio of the absorbent cotton, anthocyanin, and tea polyphenols was 1:0.15:0.15) for 10 minutes, and then the mixture of the absorbent cotton and the modified solution was beaten at 0.2 MPa for 40 minutes at a speed of 2500 rpm and a gap of 0.3 mm using a disc beater to obtain a fiber slurry;

[0125] S2. Use a 100-mesh forming net to filter out the fiber slurry. When the absorbent cotton fibers are completely covered on the surface of the forming net, remove the forming net from the fiber slurry and let it stand until no strands of liquid flow down, then peel off the primary cotton paper from the surface of the forming net;

[0126] S3, transferring the primary tissue paper to an atmosphere furnace and drying it in a nitrogen atmosphere at 40°C to produce secondary tissue paper with a moisture content of 16%;

[0127] S4. Soak the secondary cotton paper in the Pinus tabulaeformis leaf extract (30° C.) prepared in Preparation Example 4 for 15 minutes, take out the secondary cotton paper and dry it to obtain the tertiary cotton paper with a moisture content of 25%. Then, soak the tertiary cotton paper in a sodium hypochlorite aqueous solution for 30 minutes for bleaching treatment, and then dry it to obtain the absorbent cotton paper with a moisture content of 7%.

[0128] Example 6

[0129] This embodiment 6 provides a method for preparing absorbent cotton paper, comprising the following steps:

[0130] S1. The absorbent cotton prepared in Preparation Example 1 was ultrasonically mixed with a modified solution (4% by mass of anthocyanin, 4% by mass of tea polyphenols, and the mass ratio of the absorbent cotton, anthocyanin, and tea polyphenols was 1:0.15:0.15) for 10 minutes, and then the mixture of the absorbent cotton and the modified solution was beaten at 0.2 MPa for 40 minutes at a speed of 2500 rpm and a gap of 0.3 mm using a disc beater to obtain a fiber slurry;

[0131] S2. Use a 100-mesh forming net to filter out the fiber slurry. When the absorbent cotton fibers are completely covered on the surface of the forming net, remove the forming net from the fiber slurry and let it stand until no strands of liquid flow down, then peel off the primary cotton paper from the surface of the forming net;

[0132] S3, transferring the primary tissue paper to an atmosphere furnace and drying it in a nitrogen atmosphere at 40°C to produce secondary tissue paper with a moisture content of 16%;

[0133] S4. After soaking the secondary cotton paper in the Pinus tabulaeformis leaf extract (30° C.) prepared in Preparation Example 5 for 15 minutes, the secondary cotton paper is taken out and dried to obtain the tertiary cotton paper with a moisture content of 24%. The tertiary cotton paper is then soaked in a sodium hypochlorite aqueous solution for 30 minutes for bleaching treatment, and then dried to obtain the absorbent cotton paper with a moisture content of 5%.

[0134] Example 7

[0135] This embodiment 7 provides a method for preparing absorbent cotton paper, comprising the following steps:

[0136] S1. The absorbent cotton prepared in Preparation Example 1 was ultrasonically mixed with a modified solution (4% by mass of anthocyanin, 4% by mass of tea polyphenols, and the mass ratio of the absorbent cotton, anthocyanin, and tea polyphenols was 1:0.15:0.15) for 10 minutes, and then the mixture of the absorbent cotton and the modified solution was beaten at 0.2 MPa for 40 minutes at a speed of 2500 rpm and a gap of 0.3 mm using a disc beater to obtain a fiber slurry;

[0137] S2. Use a 100-mesh forming net to filter out the fiber slurry. When the absorbent cotton fibers are completely covered on the surface of the forming net, remove the forming net from the fiber slurry and let it stand until no strands of liquid flow down, then peel off the primary cotton paper from the surface of the forming net;

[0138] S3, transferring the primary tissue paper to an atmosphere furnace and drying it in a nitrogen atmosphere at 40°C to produce secondary tissue paper with a moisture content of 16%;

[0139] S4. After soaking the secondary cotton paper in the Pinus tabulaeformis leaf extract (30° C.) prepared in Preparation Example 6 for 15 minutes, the secondary cotton paper is taken out and dried to obtain the tertiary cotton paper with a moisture content of 23%. The tertiary cotton paper is then soaked in a sodium hypochlorite aqueous solution for 30 minutes for bleaching treatment, and then dried to obtain the absorbent cotton paper with a moisture content of 4%.

[0140] Example 8

[0141] This embodiment 8 provides a method for preparing absorbent cotton paper, comprising the following steps:

[0142] S1. The absorbent cotton prepared in Preparation Example 1 was ultrasonically mixed with a modified solution (4% by mass of anthocyanin, 4% by mass of tea polyphenols, and the mass ratio of the absorbent cotton, anthocyanin, and tea polyphenols was 1:0.15:0.15) for 10 minutes, and then the mixture of the absorbent cotton and the modified solution was beaten at 0.2 MPa for 40 minutes at a speed of 2500 rpm and a gap of 0.3 mm using a disc beater to obtain a fiber slurry;

[0143] S2. Use a 100-mesh forming net to filter out the fiber slurry. When the absorbent cotton fibers are completely covered on the surface of the forming net, remove the forming net from the fiber slurry and let it stand until no strands of liquid flow down, then peel off the primary cotton paper from the surface of the forming net;

[0144] S3, transferring the primary tissue paper to an atmosphere furnace and drying it in a nitrogen atmosphere at 40°C to produce secondary tissue paper with a moisture content of 16%;

[0145] S4. Soak the secondary cotton paper in the Pinus tabulaeformis leaf extract (30° C.) prepared in Preparation Example 7 for 15 minutes, take out the secondary cotton paper and dry it to obtain the tertiary cotton paper with a moisture content of 21%. Then, soak the tertiary cotton paper in a sodium hypochlorite aqueous solution for 30 minutes for bleaching treatment, and then dry it to obtain the absorbent cotton paper with a moisture content of 5%.

[0146] Comparative Example 1

[0147] This comparative example 1 provides a method for preparing absorbent cotton paper, comprising the following steps:

[0148] D1. After dispersing the absorbent cotton prepared in Preparation Example 1 in deionized water and ultrasonically mixing for 10 minutes, the mixture of the absorbent cotton and deionized water was beaten at 0.2 MPa for 40 minutes at a speed of 2500 rpm and a gap of 0.3 mm using a disc beater to obtain a fiber slurry;

[0149] D2. Use a 100-mesh forming net to filter out the fiber slurry. When the absorbent cotton fibers are completely covered on the surface of the forming net, remove the forming net from the fiber slurry and let it stand until no strands of liquid flow down, then peel off the primary cotton paper from the surface of the forming net;

[0150] D3, transferring the primary tissue paper to an atmosphere furnace and drying it in a nitrogen atmosphere at 40°C to produce secondary tissue paper with a moisture content of 17%;

[0151] D4. After soaking the secondary cotton paper in the Pinus tabulaeformis leaf extract (30° C.) prepared in Preparation Example 2 for 15 minutes, the secondary cotton paper was taken out and dried to obtain the tertiary cotton paper with a moisture content of 20%. The tertiary cotton paper was then soaked in a sodium hypochlorite aqueous solution for 30 minutes for bleaching treatment, and then dried to obtain the absorbent cotton paper with a moisture content of 6%.

[0152] Comparative Example 2

[0153] This comparative example 2 provides a method for preparing absorbent cotton paper, comprising the following steps:

[0154] D1. The absorbent cotton prepared in Preparation Example 1 was ultrasonically mixed with a modified solution (4% by mass anthocyanin, 4% by mass tea polyphenols, and the mass ratio of the absorbent cotton, anthocyanin, and tea polyphenols was 1:0.15:0.15) for 10 minutes, and then the mixture of the absorbent cotton and the modified solution was beaten at 0.2 MPa for 40 minutes at a speed of 2500 rpm and a gap of 0.3 mm using a disc beater to obtain a fiber slurry;

[0155] D2. Use a 100-mesh forming net to filter out the fiber slurry. When the absorbent cotton fibers are completely covered on the surface of the forming net, remove the forming net from the fiber slurry and let it stand until no strands of liquid flow down, then peel off the primary cotton paper from the surface of the forming net;

[0156] D3. The primary tissue paper is transferred to an atmosphere furnace and dried in a nitrogen atmosphere at 40° C. to obtain secondary tissue paper with a moisture content of 17%. The secondary tissue paper is soaked in a sodium hypochlorite aqueous solution for 30 minutes for bleaching treatment, and then dried to obtain absorbent tissue paper with a moisture content of 6%.

[0157] Comparative Example 3

[0158] This comparative example 3 provides a method for preparing absorbent cotton paper, comprising the following steps:

[0159] D1. After dispersing the absorbent cotton prepared in Preparation Example 1 in deionized water and ultrasonically mixing for 10 minutes, the mixture of the absorbent cotton and deionized water was beaten at 0.2 MPa for 40 minutes at a speed of 2500 rpm and a gap of 0.3 mm using a disc beater to obtain a fiber slurry;

[0160] D2. Use a 100-mesh forming net to filter out the fiber slurry. When the absorbent cotton fibers are completely covered on the surface of the forming net, remove the forming net from the fiber slurry and let it stand until no strands of liquid flow down, then peel off the primary cotton paper from the surface of the forming net;

[0161] D3. The primary tissue paper is transferred to an atmosphere furnace and dried in a nitrogen atmosphere at 40° C. to obtain secondary tissue paper with a moisture content of 17%. The secondary tissue paper is soaked in a sodium hypochlorite aqueous solution for 30 minutes for bleaching treatment, and then dried to obtain absorbent tissue paper with a moisture content of 6%.

[0162] The absorbent cotton papers prepared in Examples 1 to 8 and Comparative Examples 1 to 3 were subjected to the following tests:

[0163] Water absorption test: Weigh the weight change of the absorbent cotton paper before and after saturated water absorption, and calculate the saturated water absorption rate of the absorbent cotton paper, saturated water absorption rate = weight gain after saturated water absorption / mass after saturated water absorption, and the results are shown in Table 1 below; irradiate the absorbent cotton paper with a 15W xenon lamp in a dust-free and transparent environment for 72 hours, and then perform a water absorption test, and the results are shown in Table 1 below;

[0164] Water absorption rate test: prepare a red dye solution, and insert the absorbent cotton paper into the dye solution at an angle of 45°, control the side insertion depth of the absorbent cotton paper to be 2mm, and calculate the water absorption rate of the absorbent cotton paper to the solution as shown in Table 2 below; after irradiating the absorbent cotton paper with a 15W xenon lamp in a dust-free and transparent environment for 72 hours, perform a water absorption rate test, and the results are shown in Table 2 below;

[0165] Antibacterial test: Based on the method recorded in the third part of GB / T20944.3-2008 "Antibacterial Properties of Textiles", Staphylococcus aureus was selected as the test strain to test the antibacterial property of the absorbent cotton paper, and the initial antibacterial rate of the absorbent cotton paper was determined, and the results are shown in Table 3 below; the absorbent cotton paper was then irradiated with a 15W xenon lamp in a dust-free and transparent environment for 72 hours, and then the antibacterial test was performed, and the results are shown in Table 3 below;

[0166] Water-locking test: After the absorbent cotton paper is saturated with the red dye solution, drain the water and use a cotton cloth with the same area as the absorbent cotton paper to stick to the surface of the cotton paper. After evenly pressing with a 1kg weight for 10 minutes, observe the ratio of the red area on the surface of the cotton cloth to the side area of ​​the cotton cloth, as shown in Table 4 below; then, irradiate the absorbent cotton paper with a 15W xenon lamp in a dust-free and transparent environment for 72 hours, and then conduct a water-locking test. The results are shown in Table 4 below.

[0167] The above tests were repeated three times and the average value was calculated.

[0168] Table 1 Water absorption test results

[0169]

[0170] Table 2 Water absorption rate test results

[0171]

[0172] Table 3 Antibacterial test results

[0173]

[0174] Table 4 Water lock test results

[0175]

[0176] Although the embodiments of the present invention are described in detail above, it is obvious to those skilled in the art that various modifications and variations can be made to these embodiments. However, it should be understood that such modifications and variations are within the scope and spirit of the present invention as described in the claims. Moreover, the present invention described herein may have other embodiments and may be implemented or realized in a variety of ways.

Claims

1. A method for preparing non-polluting absorbent cotton paper, characterized in that: The following steps are involved: The absorbent cotton is pulped in the modified solution to prepare a fiber pulp; Primary cotton paper is filtered from the fiber slurry using a forming net; the primary cotton paper is dried to obtain secondary cotton paper with a moisture content of 10-20%; the secondary cotton paper is soaked in a Pinus lanceolata leaf extract for modification, then taken out and dried to obtain absorbent cotton paper with a moisture content of 3-8%.

2. The preparation method according to claim 1, characterized in that: The preparation method of the Pinus tabulaeformis leaf extract comprises: steaming Pinus tabulaeformis leaf powder in boiling water for 1-2 hours to obtain mature powder, mixing the mature powder with a composite bacterial solution, fermenting and sterilizing, collecting the fermentation solution and fermentation residue; keeping the fermentation residue warm in deionized water at 90-100°C for 1-2 hours, separating the water extract, combining the water extract and the fermentation solution, and concentrating them under an inert atmosphere to obtain the Pinus tabulaeformis leaf extract.

3. The preparation method according to claim 2, characterized in that: When the cooked powder is mixed with the composite bacterial liquid, the composite bacterial liquid includes a fermentation base liquid and a fermentation mixed bacteria inoculated in the fermentation base liquid, and the fermentation mixed bacteria includes lactic acid bacteria and yeast.

4. The preparation method according to claim 3, characterized in that: The fermentation base liquid includes a sugar source, and the sugar source includes at least one of glucose and maltose; and / or the lactobacillus is lactobacillus CGMCC NO.0843; and / or the yeast is CGMCC NO.27154; and / or the inoculation concentration of the fermentation mixed bacteria in the fermentation base liquid is 10 6 -10 7 CFU / mL; and / or, the ratio of the number of viable lactobacilli to that of viable yeast in the fermentation mixture is (0.5-1):

1.

5. The preparation method according to claim 2, characterized in that: After the matured powder is mixed with the composite bacterial solution, the mixture is fermented in an anaerobic environment at 25-37° C. and a pH of 5-6 for 70-74 hours and then sterilized; the sterilization includes at least one of high temperature sterilization and ultraviolet sterilization.

6. The preparation method according to claim 2, characterized in that: The pine leaf powder is sieved through a 100-200 mesh screen and then steamed in boiling water; and / or, the water content of the pine leaf powder is 5-10%; and / or, the mixing ratio of the number of live bacteria in the composite bacterial liquid to the mature powder is 10 6 -10 7 CFU / g; and / or, the volume of the Pinus lappa leaf extract is 1 / 4-1 / 3 of the volume of the water extract and the fermentation broth mixed.

7. The preparation method according to claim 1, characterized in that: When the absorbent cotton is pulped in a modified solution, the modified solution comprises 5-10% by mass of active polyphenols, and the active polyphenols comprise at least one of tea polyphenols, anthocyanidins, resveratrol and curcumin.

8. The preparation method according to claim 1, characterized in that: The absorbent cotton is ultrasonically mixed in the modified solution for 10-15 minutes, and then beaten at a rotation speed of 2000-3000 rpm and a gap of 0.1-0.5 mm for 30-45 minutes to prepare a fiber slurry.

9. The preparation method according to claim 1, characterized in that: The second-grade cotton paper is soaked in 30-35°C Pinus lanceolata leaf extract for 15-20 minutes, then taken out and dried to produce third-grade cotton paper with a moisture content of 20-25%. The third-grade cotton paper is bleached in bleaching liquid and then dried to produce absorbent cotton paper with a moisture content of 3-8%.

10. The preparation method according to claim 1, characterized in that: The preparation method of the absorbent cotton comprises: combing the cotton fibers after impurities are removed to obtain cotton linters; degreasing the cotton linters in an alkali solution and then bleaching them to obtain the absorbent cotton.

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