Modified filler of medical stone powder and its preparation method

Abstract

The present application belongs to the field of surface modification of biological filler, and provides a modified biological filler with zeolite powder and a preparation method thereof. The modified filler is obtained by coating a hydrophilic modified filler surface with a biological affinity coating. The preparation method comprises the following steps: washing and drying polyethylene filler and zeolite respectively, immersing the washed and dried polyethylene filler in a surface treatment liquid to obtain polyethylene filler oxidized by liquid phase, mixing the washed and dried zeolite powder with a biodegradable binder solution to prepare a modified binder solution, immersing the polyethylene filler oxidized by liquid phase in the modified binder solution, and then drying to solidify to obtain the modified filler with zeolite powder. The modified filler with zeolite powder can be used for treating various wastewater.

Description

Technical Field

[0001] This invention belongs to the field of surface modification of biological fillers, specifically relating to a method for modifying the surface properties of biological fillers using maifanite powder. Background Technology

[0002] Organic polymer fillers such as polyethylene (PE) and polypropylene (PP) are widely used in wastewater biological treatment due to their higher porosity, higher specific surface area and easier operation. However, their material surfaces often have low roughness and poor hydrophilicity, which is not conducive to microbial attachment and leads to problems such as slow biofilm formation. Therefore, they are often modified to improve hydrophilicity and biocompatibility in order to improve treatment efficiency.

[0003] Maifan stone powder is mainly composed of inorganic aluminosilicates, which have good biocompatibility. In addition, it contains various amino acids and essential trace elements for organisms such as potassium, sodium, calcium, magnesium, copper, and iron. Therefore, using maifan stone powder as a modifier for biological packing materials can not only improve the hydrophilicity and biocompatibility of the packing surface, but also provide nutrients for microorganisms on the packing surface, promoting their growth and effectively improving the biofilm formation performance of the biological packing material.

[0004] Currently, there are two main technical solutions for modifying organic polymer fillers using maifanite powder. One method involves first blending the modifier particles with the polymer, and then processing them into fillers through extrusion or injection molding. For example, Chinese invention patent 03140386.7 involves mixing biocompatible substances, hydrophilic substances, magnetic powder, and activated carbon into a polymer matrix, adding a dispersing lubricant, stirring evenly, feeding it into an injection molding machine, extruding it through a mold, and then magnetizing it to obtain a biocompatible filler. However, the above-mentioned existing modification methods have the following shortcomings: 1) When using modifier particles to fill and blend modified biofillers, most of the modifier particles are distributed inside the filler, with only a small portion distributed on the surface, thus limiting the improvement in surface properties; 2) The filler blend modification method is costly, and the interfacial compatibility between the modified substances cannot be ignored. Poor interfacial compatibility leads to a series of defects such as decreased mechanical properties and density, and poor surface quality.

[0005] Another approach is to directly apply the modifier particles to the surface of the pre-formed biological packing material. For example, the technical solution disclosed in Chinese Invention Patent 200610052258.1 involves mixing chitin, starch, plant powders, etc., with polyacrylate or polyethylene methyl aldehyde latex, and then applying the mixture to the packing surface using the adhesive effect of the latex. After the solvent evaporates, the modifier particles are adhered to the surface of the biological packing material by the coating. However, the above-mentioned existing modification methods have the following shortcomings: 1) When using polyacrylate or polyethylene methyl aldehyde latex to adhere the modifier particles to the packing surface, the modifier particles are encapsulated by the polymer latex, preventing direct contact with wastewater and microorganisms. The nutrient components of the modifier are also difficult to release, failing to fully realize the advantages of the modifier's hydrophilicity, biophilicity, and rich nutrient content; 2) When using polyacrylate or polyethylene methyl aldehyde latex to adhere the modifier particles to the packing surface, the polymer latex will clog the pores of the packing material itself, reducing the contact area between microorganisms and the packing material, and affecting the mass transfer performance between wastewater and microorganisms.

[0006] To address the shortcomings of invention patent 200610052258.1, invention patent 201511025718.7 employs a biodegradable binder to coat oyster shell powder onto the surface of a bio-filler. The biodegradable binder solution is formed by dissolving polylactic acid with a relative molecular mass of 1000-20000 in acetone, dichloromethane, chloroform, ethyl acetate, or tetrahydrofuran solvent; or the biodegradable binder solution is prepared by dissolving modified starch in an aqueous solution. During the modification process, the density of the filler after adhering oyster shell powder can be controlled to slightly greater than 1 g / cm³ by adjusting the particle size of the oyster shell powder and the amount of loaded powder. 3 This facilitates packing material movement and wastewater treatment operations. During biofilm formation, the biodegradable binder automatically degrades, and the adhered oyster shell powder gradually falls off. Biofilm can then regrow in the areas where the oyster shell powder has fallen off. Once most of the adhered oyster shell powder has detached, the apparent density of the packing material is readjusted to slightly greater than 1 g / cm³. 3 The apparent density is similar to that of unmodified filler after biofilm formation. However, the existing modification scheme has the following shortcomings: 1) The degradation process of oyster shell powder is difficult to control in actual operation. If the degradation is too fast, the utilization efficiency of oyster shell powder cannot be guaranteed. If the degradation is too slow, it will affect the mass transfer performance of the filler to a certain extent; 2) After the biodegradable agent and oyster shell powder fall off, the biofilm attached to its surface will also fall off, which will reduce the biomass on the surface of the filler to a certain extent; 3) Polylactic acid with a relative molecular mass of 1000-20000 is too expensive. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to provide a maifanite powder modified filler and its preparation method.

[0008] To solve the above-mentioned technical problems, the present invention provides a method for preparing a maifanite powder modified biological filler, wherein the modified filler is obtained by coating a hydrophilic modified filler surface with a biocompatible coating, comprising the following steps:

[0009] 1) Wash the polyethylene filler (unmodified polyethylene filler) (to remove particulate impurities from the filler surface), and air dry (naturally air dry) to obtain the cleaned polyethylene filler for later use;

[0010] After washing and drying the maifan stone, it is crushed to a particle size of 50-100μm to obtain maifan stone powder.

[0011] 2) Immerse the cleaned polyethylene filler obtained in step 1) in a surface treatment solution at 40-60°C. After immersion, rinse with pure water (to remove reagent residues on the surface of the filler) and then dry at 30-50°C to obtain polyethylene filler that has undergone liquid phase oxidation.

[0012] The surface treatment solution is an acidic liquid-phase oxidation solution, which consists of a strong oxidant with a mass concentration of 1-5%, a strong acid with a mass concentration of 10-50%, and pure water as the balance.

[0013] 3) Mix the maifan stone powder obtained in step 1) with the biodegradable adhesive solution to obtain the modified adhesive solution.

[0014] The mass ratio of the maifan stone powder to the biodegradable binder solution is 1:40 to 1:70.

[0015] 4) Immerse the polyethylene filler obtained in step 2) after liquid phase oxidation in the modified adhesive solution obtained in step 3); then dry it at 30-50℃ until cured (drying and curing time is about 2-4 hours) to obtain the maifan stone powder modified filler.

[0016] Note: In step 4), soaking is to ensure that the polyethylene filler and the modified adhesive are in full contact, so that the maifan stone powder adheres to the surface of the polyethylene filler. Therefore, the soaking time is generally 10 to 30 seconds.

[0017] An improvement to the preparation method of the maifanite powder modified biological filler of the present invention:

[0018] The strong oxidant in step 2) is potassium permanganate or potassium dichromate; the strong acid is hydrochloric acid or sulfuric acid.

[0019] As a further improvement to the preparation method of the maifanite powder modified biological filler of the present invention:

[0020] The soaking time in step 2) is 1 to 3 hours; the soaking time in step 4) is 10 to 30 seconds.

[0021] As a further improvement to the preparation method of the maifanite powder modified biological filler of the present invention:

[0022] The biodegradable adhesive solution in step 3) is obtained by dissolving chitosan in a solvent; the mass concentration of chitosan in the biodegradable adhesive solution is 0.5-2%, and the solvent is an acetic acid solution with a pH of 4-5.

[0023] As a further improvement to the preparation method of the maifanite powder modified biological filler of the present invention:

[0024] The degree of deacetylation of the chitosan is ≥95%.

[0025] As a further improvement to the preparation method of the maifanite powder modified biological filler of the present invention:

[0026] Step 1) is to wash the polyethylene packing with pure water in an ultrasonic cleaner for 10-15 minutes to remove particulate impurities from the surface of the packing, and then air dry it to obtain the cleaned polyethylene packing.

[0027] The present invention also provides a maifanite powder modified biological filler prepared by any of the above methods.

[0028] This invention addresses the shortcomings of existing biological fillers, such as poor hydrophilicity and biocompatibility, by proposing a modification method that combines liquid-phase oxidation with the porous, rough, highly adsorbent, and alkalinity-regulating properties of maifanite powder, thereby accelerating biofilm formation and improving wastewater treatment efficiency.

[0029] Compared with the prior art, the present invention has the following technical advantages:

[0030] 1) Applying maifanite powder to the surface of the filler allows for the direct release of its nutrients and trace elements, enabling direct contact between microorganisms and the powder, thus improving the utilization efficiency of the maifanite powder and accelerating microbial growth and reproduction. Furthermore, the surface coating method avoids the problem of poor interfacial compatibility that often occurs in filler blending modifications.

[0031] 2) Maifan stone powder is rich in pores with a diameter of 5-15μm. Therefore, applying maifan stone powder to the surface of the filler significantly increases the surface area of ​​the filler, which is conducive to the growth of microorganisms and improves the initial wastewater treatment effect.

[0032] 3) Chitosan acetate binder has excellent adhesion properties, which can minimize the shedding of maifan stone powder and reduce the loss of biofilm on the filler surface. In addition, after drying, excess solvent evaporates, leaving only a thin film of binder and maifan stone powder on the filler surface, which will not clog the pores of the filler itself.

[0033] 4) Since the density of ordinary polyethylene filler is slightly less than that of water, it will float on the water surface in the early stage of biofilm formation, which is not conducive to fluidization and mass transfer. After being coated with maifan stone powder, the surface density of the filler will be slightly greater than that of water, thus sinking below the water surface, which is conducive to the agitation and fluidization of the filler and the mass transfer of oxygen.

[0034] 5) The surface of the filler is modified by surface coating, which is convenient, inexpensive, efficient and easy to implement for large-scale industrial production. Attached Figure Description

[0035] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0036] Figure 1 The images show the contact angle measurements of the filler surface before modification (left image) and after modification (right image).

[0037] Figure 2 SEM images of the filler surface before modification (left image) and after modification (right image);

[0038] Figure 3 The images show the EDS (Electronic Data Discharge) effects on the filler surface before modification (top image) and after modification (bottom image).

[0039] Figure 4 The changes in effluent water quality during the MBBR biofilm formation start-up period are shown in the figures before (top) and after (bottom).

[0040] Figure 5 SEM images of the biofilm on the filler surface before modification (left image) and after modification (right image);

[0041] Figure 6 Analysis of the microbial community composition on the surface of the filler before modification (PE) and after modification (LO-PE). Detailed Implementation

[0042] The present invention will be further described below with reference to specific embodiments, but the scope of protection of the present invention is not limited thereto:

[0043] Polyethylene packing (unmodified polyethylene packing), such as K5 type polyethylene packing available from Henan Sanxing Water Treatment Equipment Co., Ltd.;

[0044] The concentration of concentrated sulfuric acid is 98%.

[0045] The concentration of hydrochloric acid is 37%.

[0046] Example 1: A method for preparing a bio-filler modified with maifanite powder, comprising the following steps:

[0047] 1) Wash the unmodified polyethylene filler with pure water in an ultrasonic cleaner for about 10 minutes to remove particulate impurities on the surface of the filler. After drying naturally to constant weight, the cleaned polyethylene filler is obtained and set aside.

[0048] Maifan stone is washed with water and naturally dried to constant weight, then crushed to a particle size of 50-100 μm to obtain maifan stone powder.

[0049] 2) The surface treatment solution is composed of potassium dichromate, concentrated sulfuric acid and pure water, with a mass ratio of potassium dichromate, concentrated sulfuric acid and pure water of 1:15:15.

[0050] The cleaned polyethylene filler obtained in step 1) was immersed in a surface treatment solution at 60°C for 90 minutes. After immersion, it was rinsed with pure water to remove reagent residues on the surface of the filler. Then it was dried at 30-50°C to constant weight to obtain polyethylene filler that had undergone liquid phase oxidation.

[0051] 3) The biodegradable adhesive solution is obtained by dissolving chitosan in a solvent; the mass concentration of chitosan in the biodegradable adhesive solution is 1%, and the solvent is an aqueous solution of acetic acid with a pH of 4-5.

[0052] A modified adhesive solution was prepared by uniformly mixing maifan stone powder with a particle size of 50-100 μm with chitosan binder.

[0053] The weight ratio of the maifan stone powder to the biodegradable binder solution is 1:50.

[0054] 4) Immerse the polyethylene filler obtained in step 2) after liquid phase oxidation in the modified adhesive solution obtained in step 3) for 20 seconds, and then dry it at 30-50℃ until it is cured (the drying and curing time is about 3 hours) to obtain the maifan stone powder modified biological filler.

[0055] Note: During the soaking process in step 4), the polyethylene filler is always submerged in the modified adhesive liquid, that is, the polyethylene filler is fully in contact with the modified adhesive liquid, so that the maifan stone powder adheres to the surface of the polyethylene filler.

[0056] According to GB / T 24368-2009, the contact angle of the filler surface after liquid-phase oxidation modification obtained in step 2) was tested to be 45.5°, which was 49.9% lower than that of the unmodified filler (90.8°). Figure 1 The hydrophilic properties are significantly improved.

[0057] According to GB / T 33834-2007, after testing, the SEM image of the modified biological filler obtained by this invention after coating with maifan stone powder showed that the surface of the filler was covered with irregular substances, which increased the surface area of ​​the filler. Figure 2It also increased the O content and O / C ratio on the filler surface. Figure 3 This enhances the hydrophilic properties.

[0058] According to HT 535-2009, HJ / T 346-2007, and GB 7493-1987, the MBBR prepared using the maifanite powder modified biological filler obtained in Example 1 of this invention, under continuous aeration conditions, treated seawater aquaculture wastewater (specific components: NH4Cl 0.0955g / L, MgSO4·7H2O 0.01g / L, K2HPO4 0.022g / L, CaCl2 0.02g / L, NaHCO3 1g / L, Na2HPO4·12H2O 0.1g / L, NaCl 30g / L) using a natural biofilm formation method. Compared with MBBR prepared using ordinary polyethylene, the biofilm formation time was shortened from 137 days to 121 days. Figure 4 In the initial stage of biofilm stabilization (within 15 days after biofilm formation), the ammonia nitrogen removal rate increased from 91.7% to 95.8%, and the surface biofilm had a more compact structure. Figure 5 and a richer microbial community ( Figure 6 ).

[0059] Example 2: A method for preparing a bio-filler modified with maifanite powder, comprising the following steps:

[0060] 1) Same as step 1) of Example 1;

[0061] 2) The surface treatment solution is composed of potassium dichromate, concentrated sulfuric acid and pure water, with a mass ratio of potassium dichromate, concentrated sulfuric acid and pure water of 1:10:15.

[0062] The cleaned polyethylene filler obtained in step 1) was immersed in a surface treatment solution at 40°C for 90 minutes, and the subsequent treatment was the same as step 2) of implementation 1; thus, polyethylene filler that has been oxidized by liquid phase was obtained.

[0063] Subsequent steps 3) to 4) are the same as steps 3) to 4) in Example 1; thus obtaining the modified filler made from maifanite powder.

[0064] Subsequent testing methods are the same as those described in Example 1.

[0065] Tests showed that the contact angle of the filler surface after liquid-phase oxidation modification obtained in step 2) was 68.7°, which was 23.9% lower than that of the unmodified filler (90.8°), indicating improved hydrophilicity.

[0066] Testing showed that the MBBR prepared using the maifanite powder modified biological packing material obtained in Example 2 of this invention, when treating simulated freshwater aquaculture wastewater (specific components: NH4Cl 0.0955 g / L, MgSO4·7H2O 0.01 g / L, K2HPO4 0.022 g / L, CaCl2 0.02 g / L, NaHCO3 1 g / L, Na2HPO4·12H2O 0.1 g / L) under continuous aeration conditions using sludge inoculation, shortened the biofilm formation time from 23 days to 11 days compared to ordinary polyethylene MBBR. Furthermore, the ammonia nitrogen removal rate during the initial stable biofilm formation stage (within 7 days after biofilm formation) increased from 93.6% to 96.1%.

[0067] Example 3: A method for preparing a bio-filler modified with maifanite powder, comprising the following steps:

[0068] 1) Same as step 1) of Example 1;

[0069] 2) The surface treatment solution is composed of potassium permanganate, hydrochloric acid and pure water, with a mass ratio of potassium permanganate, hydrochloric acid and pure water of 1:10:15;

[0070] The cleaned polyethylene filler obtained in step 1) was immersed in a surface treatment solution at 50°C for 60 minutes, and the subsequent treatment was the same as step 2) of implementation 1; thus, polyethylene filler that has been oxidized by liquid phase was obtained.

[0071] Subsequent steps 3) to 4) are the same as steps 3) to 4) in Example 1, yielding the modified filler made from maifanite powder.

[0072] The subsequent testing methods are the same as those described in Example 2.

[0073] Testing showed that the contact angle of the packing material after liquid-phase oxidation modification was 70.4°, a decrease of 22.5% compared to the unmodified packing material (90.8°), indicating improved hydrophilicity. The MBBR prepared using the maifanite powder-modified biological packing material obtained in Example 3 of this invention, when used under continuous aeration conditions with sludge inoculation to treat simulated freshwater aquaculture wastewater, showed a reduction in biofilm formation time from 23 days to 13 days compared to ordinary polyethylene MBBR. Furthermore, the ammonia nitrogen removal rate during the initial stable biofilm formation stage (within 7 days after biofilm formation) increased from 93.6% to 96.5%.

[0074] Comparative Example 1

[0075] Steps 1) to 2) are the same as steps 1) to 2) in Example 1.

[0076] Step 3) The preparation of the biodegradable adhesive solution is the same as step 3) of Example 1, but the step of mixing the maifan stone powder and chitosan adhesive evenly in step 3) of Example 1 is omitted.

[0077] Step 4) Immerse the polyethylene filler obtained in Step 2) after liquid phase oxidation in the biodegradable binder solution obtained in Step 3) for 20 seconds. Then, relying on the binder, sprinkle maifan stone powder on the surface of the filler (until the maifan stone powder can no longer adhere to the surface of the filler). Dry to remove the solvent in the residual binder, and obtain a polyethylene filler with maifan stone powder loaded on the surface.

[0078] Subsequent testing methods are the same as those described in Example 1.

[0079] Tests showed that the MBBR prepared using polyethylene filler with surface-loaded maifanite powder obtained in Comparative Example 1, when treating seawater aquaculture wastewater under continuous aeration conditions using a natural biofilm formation method, shortened the biofilm formation time from 137 days to 133 days compared to the MBBR prepared using ordinary polyethylene. Furthermore, the ammonia nitrogen removal rate in the initial stable biofilm formation stage (within 15 days after biofilm formation) increased from 91.7% to 92.9%.

[0080] Compared with Example 1, the drawback of Comparative Example 1 is that the maifan stone powder does not bond sufficiently with the surface of the packing material, making it easy to fall off under aeration conditions; the maifan stone powder is unevenly distributed on the surface of the packing material, limiting the improvement of the overall hydrophilicity of the packing material.

[0081] Comparative Example 2-1: In step 3) of Example 1, "the mass concentration of chitosan is 1%" was changed to "the mass concentration of chitosan is 2%"; the rest was the same as in Example 1, and the modified biological filler was obtained.

[0082] Subsequent testing methods are the same as those described in Example 1.

[0083] Tests showed that the MBBR prepared using the maifanite powder modified biological filler obtained in Comparative Example 2-1, when treating seawater aquaculture wastewater under continuous aeration conditions using a natural biofilm formation method, shortened the biofilm formation time from 137 days to 128 days compared to the MBBR prepared using ordinary polyethylene, and increased the ammonia nitrogen removal rate from 91.7% to 93.8% in the initial stage of biofilm stabilization.

[0084] Comparative Example 2-2: In step 3) of Example 1, "the mass concentration of chitosan is 1%" was changed to "the mass concentration of chitosan is 0.5%"; the rest was the same as in Example 1, and the modified biological filler was obtained.

[0085] Subsequent testing methods are the same as those described in Example 1.

[0086] Tests showed that the MBBR prepared using the maifanite powder modified biological filler obtained in Comparative Example 2-2, when treating seawater aquaculture wastewater under continuous aeration conditions using a natural biofilm formation method, shortened the biofilm formation time from 137 days to 127 days compared to the MBBR prepared using ordinary polyethylene, and increased the ammonia nitrogen removal rate from 91.7% to 94.2% in the initial stage of biofilm stabilization.

[0087] Comparative Example 3-1: The weight ratio of "the maifan stone powder to the biodegradable binder solution is 1:50" in step 3) of Example 1 was increased to 1:40; the rest was the same as in Example 1, resulting in maifan stone powder modified biological filler.

[0088] Subsequent testing methods are the same as those described in Example 1.

[0089] Tests showed that the MBBR prepared using the maifanite powder modified biological filler obtained in Comparative Example 3-1, when treating seawater aquaculture wastewater under continuous aeration conditions using a natural biofilm formation method, shortened the biofilm formation time from 137 days to 125 days compared to the MBBR prepared using ordinary polyethylene, and increased the ammonia nitrogen removal rate from 91.7% to 95.5% in the initial stage of biofilm stabilization.

[0090] This ratio of 3-1 would result in unnecessary cost waste.

[0091] Comparative Example 3-2: The weight ratio of "the maifan stone powder to the biodegradable binder solution is 1:50" in step 3) of Example 1 was reduced to 1:70; the rest was the same as in Example 1, and maifan stone powder modified filler was obtained.

[0092] Subsequent testing methods are the same as those described in Example 1.

[0093] Tests showed that the MBBR prepared using the maifanite powder modified biological filler obtained in Comparative Example 3-2, when treating seawater aquaculture wastewater under continuous aeration conditions using a natural biofilm formation method, shortened the biofilm formation time from 137 days to 127 days compared to the MBBR prepared using ordinary polyethylene, and increased the ammonia nitrogen removal rate from 91.7% to 94.1% in the initial stage of biofilm stabilization.

[0094] Comparative Example 4: Step 2) of Example 1 is omitted, that is, the cleaned polyethylene filler obtained in step 1) is directly immersed in the modified adhesive solution obtained in step 3); the rest is the same as Example 1.

[0095] Subsequent testing methods are the same as those described in Example 1.

[0096] Tests showed that the MBBR prepared using the maifanite powder modified biological filler obtained in Comparative Example 4, when treating seawater aquaculture wastewater under continuous aeration conditions using a natural biofilm formation method, shortened the biofilm formation time from 137 days to 130 days compared to the MBBR prepared using ordinary polyethylene, and increased the ammonia nitrogen removal rate from 91.7% to 93.2% in the initial stage of biofilm stabilization.

[0097] Compared with Example 1, its disadvantage is that the surface of the filler without liquid phase oxidation treatment is smoother, the number of oxygen-containing functional groups is small, the hydrophilicity is poor, which is not conducive to the bonding of modified adhesive and the adhesion of microorganisms, and the improvement of the overall performance of the filler is limited.

[0098] Finally, it should be noted that the above examples are merely some specific embodiments of the present invention. Obviously, the present invention is not limited to the above embodiments and many variations are possible. All variations that can be directly derived or conceived by those skilled in the art from the disclosure of the present invention should be considered within the scope of protection of the present invention.

Claims

1. A method for preparing modified biofiller from bentonite powder, characterized in that It comprises the following steps: 1) The polyethylene filler is washed with pure water in an ultrasonic cleaner for 10-15 minutes to remove the particulate impurities on the surface of the filler, and then naturally air-dried to obtain the cleaned polyethylene filler; The maifanshi is washed and dried, broken to a particle size of 50-100 μm, and then dried to obtain maifanshi powder; 2) The cleaned polyethylene filler obtained in step 1) is soaked in a surface treatment liquid at 40-60℃, then washed with pure water and dried at a temperature of 30-50℃ to obtain the polyethylene filler oxidized by liquid phase; The surface treatment liquid is an acidic liquid phase oxidation solution, which is composed of a strong oxidizing agent with a mass concentration of 1-5%, a strong acid with a mass concentration of 10-50%, and pure water as the balance; The strong oxidizing agent is potassium permanganate or potassium dichromate, and the strong acid is hydrochloric acid or sulfuric acid; 3) The maifanshi powder obtained in step 1) is mixed with a biodegradable binder solution to obtain a modified adhesive solution; The mass ratio of the maifanshi powder to the biodegradable binder solution is 1:40-1:70; The biodegradable binder solution is obtained by dissolving chitosan in a solvent; the mass concentration of chitosan in the biodegradable binder solution is 0.5-2%, the solvent is an acetic acid solution with a pH of 4-5, and the degree of deacetylation of chitosan is ≥95%; 4) The polyethylene filler oxidized by liquid phase obtained in step 2) is soaked in the modified adhesive solution obtained in step 3), and then dried at a temperature of 30-50℃ to solidify to obtain the maifanshi powder modified filler.

2. The method for preparing the maifanshi powder modified biologic filler according to claim 1, characterized in that: The soaking time in step 2) is 1-3 hours; The soaking time in step 4) is 10-30 seconds.

3. The maifanshi powder modified biologic filler prepared by the method according to claim 1 or 2.

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