96 results about "Glutaraldehyde" patented technology

This invention discloses a heterolayer-coupled cellulose-based composite membrane with impact resistance and fatigue resistance, and its preparation method. The membrane comprises: a rigid support layer composed of cellulose pulp, providing overall structural support and dimensional stability; and a flexible crosslinked layer located on the surface of the rigid support layer, composed of gelatin treated with a DES solvent system and crosslinked with glutaraldehyde, used to absorb impact energy and disperse stress. The rigid support layer and the flexible crosslinked layer form a heterolayer-coupled structure. By adjusting the modulus difference between the two layers, the bending stability and durability of the composite membrane under repeated loading and dynamic impact conditions are improved. The bilayer cellulose-based composite membrane of this invention exhibits excellent impact resistance, good fatigue resistance, and structural stability under dynamic impact and repeated bending conditions.

This invention relates to an IL5 / Bi2MoO6 / MXene photoactive composite material, a low-background photoelectrochemical aptamer sensor, its preparation method, and its applications. The sensor is constructed by sequentially modifying chitosan, glutaraldehyde, complementary DNA strands, and a gold nanoparticle-labeled aptamer. A fixed capture probe and APT-Au synergistically achieve dual signal quenching, constructing an extremely low detection baseline. When the target analyte MUC1 is present, its specific binding to the aptamer causes APT-Au to detach, dissolving the dual quenching and significantly restoring the photocurrent, thereby achieving quantitative detection. This invention solves the problems of low efficiency, heterojunction instability, and high baseline in single quenching modes of existing photoelectric materials, achieving highly sensitive, highly specific, rapid, and low-cost detection of the breast cancer biomarker MUC1 in human serum samples, providing a novel, industrially feasible technical solution for large-scale early screening of breast cancer.

This invention provides a thermally insulating porous material with oriented channels and its preparation method. The material comprises a polyvinyl alcohol composite foam matrix with oriented through-channels, heat-storing microcapsules dispersed in the matrix and distributed along the channels, and a heat-reflective layer covering the outer surface of the matrix. Its preparation mainly includes: uniformly dispersing the heat-storing microcapsules in a slurry containing polyvinyl alcohol and nanofibers; forming a matrix with parallel columnar channels through directional freezing and freeze-drying; subsequently, performing glutaraldehyde vapor crosslinking and curing; and finally coating the matrix surface with a heat-reflective layer. This invention constructs an oriented channel structure that effectively extends the heat conduction path and utilizes still air for insulation. By encapsulating phase change materials, it achieves heat storage and temperature buffering. The surface heat-reflective layer reflects radiant heat, giving the porous material comprehensive properties of thermal insulation, temperature regulation, and heat radiation reflection.

This invention relates to the field of catalytic degradation technology for organic pollutants, and particularly to an iron-modified biochar immobilized catalase, its preparation method, and its application. The preparation method of the iron-modified biochar immobilized catalase includes the following steps: mixing iron-modified biochar, catalase solution, and an extracellular polymeric substance; performing an immobilization and cross-linking reaction; and separating the solid and liquid phases to obtain the iron-modified biochar immobilized catalase; the extracellular polymeric substance is secreted by *Goldenella*. This invention uses an extracellular polymeric substance instead of traditional glutaraldehyde as a cross-linking agent, avoiding the hazards associated with glutaraldehyde. Simultaneously, the prepared iron-modified biochar immobilized catalase exhibits higher enzyme activity and superior pollutant degradation performance.

This invention relates to an iron-polyphenol-coated composite aerogel, its preparation method, and its application, belonging to the field of adsorbent preparation and application technology. The invention involves first immersing a porous aerogel in a polyphenol aqueous solution, then adding ferrous salt to the solution for liquid-phase deposition, washing with ultrapure water, crosslinking with glutaraldehyde aqueous solution, thoroughly washing with ethanol and ultrapure water, and finally drying to obtain an iron-polyphenol-coated composite aerogel. The raw materials used in this method are green and safe, the preparation process is simple, and it can be produced on a large scale. The resulting iron-polyphenol-coated composite aerogel exhibits high adsorption capacity, high selectivity, and high reduction rate for gold ions in aqueous solution, and also possesses excellent adsorption-desorption cycle stability, making it suitable for the efficient separation and recovery of gold from electronic wastewater.

The application provides a biocompatible biological aerogel material and a preparation method thereof, and the method comprises the following steps: cleaning and roughening pretreatment of a substrate; dissolving polyvinyl alcohol to prepare a precursor solution; introducing wear-resistant reinforcing materials into the precursor solution and uniformly dispersing the wear-resistant reinforcing materials; adding a crosslinking agent, glutaraldehyde, to perform a crosslinking reaction and construct a three-dimensional network structure; coating the system in the initial stage of crosslinking on the substrate, and performing low-temperature or freeze-drying and subsequent heat treatment to form a stable coating. The obtained material takes polyvinyl alcohol as a biocompatible skeleton, and has excellent porous structure, mechanical properties and wet stability through chemical crosslinking and reinforcing phase compounding. In-vitro cell experiments show that the material has no obvious toxicity to cells, and the cells adhere and spread well. The application solves the problem that the existing biological aerogel material is difficult to consider the biocompatibility, structural stability and process friendliness, and is suitable for the biomedical field such as tissue engineering scaffolds and wound dressings.

This application discloses a chemiluminescence detection kit for acrylonitrile magnetic microparticles and its detection method. The kit includes a magnetic bead working solution and a luminescent label. The magnetic bead working solution includes acrylonitrile monoclonal antibody A and streptavidin. The luminescent label includes acrylonitrile monoclonal antibody B, modified nano-silica, anhydrous toluene, methoxy polyethylene glycol-succinimide ester, N,N-dimethylformamide, acrylonitrile succinimide ester, glutaraldehyde, and ethanolamine. This application uses modified nano-silica as a carrier and grafts a polyethylene glycol hydrophilic layer onto its surface, which amplifies the acrylonitrile ester molecule signal, reduces non-specific adsorption, and improves the sensitivity, specificity, and reliability of the detection.

The application provides a method for immobilizing glucose isomerase, wherein a bacterial suspension of glucose isomerase producing bacteria TTGI is added into a gelatin aqueous solution with a mass concentration of 60-150 g / L, so that the final concentration of the bacterial bodies in the system is 50-150 g / L, and a gel block is formed after the obtained mixed solution is solidified; the gel block is soaked in n-butanol for 10-30 min, then is taken out and soaked in a glutaraldehyde solution with a mass concentration of 5-25 g / L for 30-60 min, and then is taken out and washed with deionized water until neutral, so that immobilized glucose isomerase is obtained; the method has the advantages of wide material source, low price and simple immobilization technology; when the immobilized glucose isomerase is used to produce high fructose syrup, the conversion rate can reach 63.9%, and the requirement of directly producing HFCS-55 can be met; and the immobilized enzyme can still maintain more than 93% of the initial enzyme activity after being continuously used at high temperature for 30 batches.

The application discloses a preparation method of an electric field-induced hydrogel electrode and application thereof. The method mainly uses polyvinyl alcohol as a base material, combines conductive media (PEDOT:PSS, NaCl or CaCl), a chemical crosslinking agent (glutaraldehyde) and a reversible coordination crosslinking agent (sodium tetraborate decahydrate), and introduces tannic acid to improve adhesion. The core of the method is that the electric field-induced hydrogel is added dropwise to the surface of an electrode to be grown, a redox reaction is induced in a cathode area by applying an electric field, the pH value of a solution is rapidly increased, the coordination crosslinking of sodium tetraborate is activated, and the hydrogel is rapidly and in-situ solidified on the surface of the electrode. The hydrogel electrode prepared by the method has high tensile property, high conductivity and self-repairing characteristics, has low contact impedance and high signal-to-noise ratio, and can be used as a high-performance flexible electrode and applied to detection of electrocardiosignal and other electrophysiological signals, and has obvious advantages compared with commercial electrodes.

This invention relates to a method for preparing a composite tanning agent, the composite tanning agent itself, and the tanning method thereof. The method involves preparing 5-50 parts by weight of glutaraldehyde, 5-20 parts by weight of diisopropanolamine, 5-50 parts by weight of zirconium sulfate, and 2-50 parts by weight of phosphate ester. A measured amount of water is added to a reaction vessel, and stirring is started. Diisopropanolamine is added and stirred until completely dissolved, with the temperature controlled at ≤40℃. Glutaraldehyde is slowly added, and after the addition is complete, the mixture is stirred for 30-60 minutes to obtain an aldehyde-amine modified intermediate. Zirconium sulfate is added to the intermediate, and the reaction is stirred for 40-60 minutes, controlling the pH of the entire system to 3.5-4.0. Phosphate ester is added, and the reaction is stirred for 20-30 minutes, adjusting the pH of the entire system to 3.8-4.2. The mixture is then filtered to obtain the composite tanning agent. The obtained composite tanning agent has the following advantages when tanning leather: low free aldehydes, high stability, high tanning efficiency, excellent leather-forming properties, and is environmentally friendly and chromium-free.

The application provides a recyclable high-barrier polyolefin film and a preparation method thereof, belongs to the field of food packaging, and is composed of a polyolefin base material and a crosslinked PVA / PEI composite coating coated on the surface of the base material.The raw materials of the composite coating include the following in parts by weight: 80-95 parts of PVA, 5-20 parts of PEI, 1-1.5 parts of boric acid and 0.2-0.3 parts of glutaraldehyde.The application selects boric acid as a main crosslinking agent, and simultaneously adds a small amount of aldehyde crosslinking agent to further densify the coating network.Through optimization of the crosslinking temperature and the crosslinking process, the barrier property in a high-humidity environment can be improved, and meanwhile, the coating prepared by the application has recyclability, so that the resources can be fully recycled.

This invention relates to a carrier-free immobilized enzyme and its preparation method, wherein the carrier-free immobilized enzyme is a catalytically active inclusion body of the enzyme crosslinked with glutaraldehyde, and the enzyme's end (especially the N-terminus) is tagged with histidine-leucine-histidine-leucine-histidine-leucine.

This invention provides the application of trifluoromethanesulfonyl magnetic nanospheres in chemiluminescent immunoassay. The trifluoromethanesulfonyl magnetic nanospheres are used for direct covalent coupling with antigens or antibodies. The specific preparation method includes first forming epoxy magnetic nanobead micelles, then adding trifluoromethanesulfonyl chloride as a modifier in batches under conditions of 0-25°C to obtain a crude product of trifluoromethanesulfonyl magnetic nanospheres. Then, the particles are screened by column chromatography and centrifugation to obtain the final product of trifluoromethanesulfonyl magnetic nanospheres. The trifluoromethanesulfonyl magnetic nanospheres have stronger thermal stability than p-toluenesulfonyl magnetic nanobeads, eliminating the need for an activation step. Under the action of ammonium sulfate catalyst, they are directly covalently coupled with amino-containing biomacromolecules, reducing antibody cross-linking and magnetic bead aggregation caused by activators such as EDC or glutaraldehyde.

The application discloses a starch-based coated slow-release urea and a preparation method thereof. The slow-release urea is composed of a core and a composite coating layer. The core is urea particles. The composite coating layer comprises a paraffin layer as an inner layer and a starch-based material layer as an outer layer. The mass of the paraffin layer accounts for 0.5-2% of the total mass of the slow-release urea. The total mass of the composite coating layer accounts for 4-10% of the total mass of the slow-release urea. The starch-based material layer is formed by cross-linking reaction of starch and / or modified starch and glutaraldehyde. The method is continuous, simple and low in cost. The coating material is biodegradable. The obtained product has good slow-release performance and moisture-proof stability. In addition, the outer layer film formed by chemical cross-linking has good mechanical strength and is combined firmly with the inner paraffin layer, so that the structural integrity of the coated urea during storage, transportation and application is ensured.

This invention belongs to the field of microencapsulation technology, and specifically relates to a high-lasting fragrance microcapsule and its preparation method. The preparation method of the high-lasting fragrance microcapsule provided by this invention includes the following steps: S101, mixing fragrance with hydrophilic particles and ultrasonically dispersing to obtain an oil phase; S102, mixing styrene-maleic anhydride copolymer, a strong acid-resistant anionic emulsifier, and a nonionic emulsifier, adjusting the pH, and stirring evenly to obtain an aqueous phase; S103, mixing melamine, formaldehyde, water, modifier A, and modifier B, heating and stirring, adjusting the pH, and cooling after the reaction to obtain a modified MF prepolymer; S104, adding the oil phase to the aqueous phase for emulsification to obtain an emulsion; S105, adding the modified MF prepolymer to the emulsion for crosslinking, adjusting the pH for curing, and then adding polyvinyl alcohol polymers and glutaraldehyde for secondary encapsulation to obtain the high-lasting fragrance microcapsule. The fragrance microcapsules prepared by this invention achieve a long-lasting fragrance effect and excellent wash resistance.

This invention discloses a beetle-based nanocellulose aerogel and its preparation method, belonging to the field of oil-water separation materials technology. The invention utilizes a hydrophilic framework formed by chemical crosslinking of lignocellulose nanofibers and polyvinyl alcohol with glutaraldehyde; oleophilic protrusions are formed by coating montmorillonite with graphene; the hydrophilic framework is immersed in a tert-butanol suspension containing the oleophilic protrusions, followed by freeze-drying to obtain the beetle-based nanocellulose aerogel. Due to the heterogeneous structure of the beetle, the hydrophilic framework enables high-speed transport of the aqueous phase, while the oleophilic protrusions efficiently capture and demulsify oil droplets. The synergistic effect of these two mechanisms achieves an ultra-high throughput greater than 10,000 L / m³. ‑2 h ‑1 With a separation efficiency of up to 95%, it effectively alleviates the trade-off between permeation flux and separation efficiency in traditional oil-water separation materials.

The application discloses a preparation method of chitosan / sodium alginate composite aerogel, which comprises the following steps: adding chitosan into an ice acetic acid solution to form a chitosan solution, adding sodium alginate into a NaOH solution to form a sodium alginate solution, dropping the chitosan solution into the sodium alginate solution, and stirring to form gel small balls; adding the gel small balls into a glutaraldehyde solution to obtain gel bead balls; and performing alkali washing on the gel bead balls to obtain chitosan / sodium alginate composite aerogel with holes. The composite aerogel prepared by the preparation method can purify low-concentration perchlorate in water bodies at a high adsorption rate. The application further discloses the chitosan / sodium alginate composite aerogel and application thereof in removing perchlorate.

This invention relates to the field of crystal materials technology, specifically disclosing a wear-resistant and antibacterial composite leather for electronic skin and its preparation method. The composite leather is composed of delimed bare leather, plant polyphenols, glutaraldehyde, lysine-chitosan graft polymer, tannic acid-zirconium coordination oligomer solution, plant-derived wax esters, and lipase. The preparation method includes: adding plant polyphenols and glutaraldehyde to the delimed bare leather for tanning to obtain primary cross-linked raw leather; adjusting the pH and then adding lysine-chitosan graft polymer and tannic acid-zirconium coordination oligomer for an antibacterial mineralization reaction; then adding plant-derived wax esters and lipase for an enzyme-catalyzed transesterification reaction; finally, drying, rehydrating, and softening to obtain the finished product. This invention, through the synergistic effect of multi-stage processes including composite tanning, synergistic antibacterial action, and enzyme-catalyzed lubrication, enables the composite leather to possess excellent wear resistance, long-lasting antibacterial properties, high breathability, and good softness, making it suitable for wearable devices such as electronic skin and showing promising application prospects.

The application discloses a perfluorohexanone microcapsule fire extinguishing agent based on a complex coagulation method and a preparation method thereof. The fire extinguishing agent is prepared by taking perfluorohexanone as a core material, insoluble complexes formed by a complex coagulation reaction of gelatin and sodium hexametaphosphate at pH 4.0-5.0 as a wall material, and being double-crosslinked and solidified. The application obtains a stable perfluorohexanone emulsion by introducing an emulsifier Span 80 into an emulsified solution of gelatin and perfluorohexanone, and sequentially performs two crosslinking and solidification through glutaraldehyde and resorcinol and formaldehyde after the complex coagulation encapsulation, so that the coating rate, stability, mechanical strength and thermal response sensitivity of the microcapsule are significantly improved. The obtained microcapsule fire extinguishing agent shows excellent flame inhibition and thermal propagation blocking capacity in the simulation of electric meter box fire and lithium ion battery thermal runaway test, can effectively delay the thermal runaway starting time and reduce the peak temperature, and provides a microcapsule fire extinguishing agent which is efficient, stable, safe and has repeated fire extinguishing performance for lithium battery, special electric appliance cabinet, data center and other scenes which need continuous fireproofing / explosion suppression protection.

The present application relates to natural polymer materials and water treatment flocculant technical field, specifically to a kind of natural polymer flocculant, the flocculant is prepared from the following raw materials by weight parts: chitosan 20-30 parts, starch 15-25 parts, lignin 10-20 parts, modifier 5-10 parts, crosslinking agent 3-8 parts and deionized water 100-200 parts.The flocculant of the present application is modified by chitosan grafting, starch oxidation and lignin sulfonation, combined with glutaraldehyde crosslinking to form a three-dimensional network structure, with electric neutralization, adsorption bridging and sweeping effect, it can efficiently adsorb and agglomerate the negatively charged colloidal particles in water, it uses natural renewable polymer as raw material, molecular structure is degradable, no environmental residue, and low heavy metal content, solve the drawbacks of traditional flocculant, suitable for drinking water, surface water and high sensitive industrial wastewater treatment, with efficiency and ecological safety.

The application discloses a reversible photothermal evaporator based on biomass ash and biochar as well as a preparation method and application thereof. The evaporator is prepared by dissolving polyvinyl alcohol and chitosan in an acetic acid aqueous solution, mixing biomass ash and biochar to obtain a spraying solution, and spraying the spraying solution on a filter membrane with a reversible polyhedral structure having edges and corners, and then spraying a glutaraldehyde solution to form a hydrogel layer. The photothermal evaporator can be used for seawater desalination and exhibits excellent seawater desalination performance. The core features are as follows. Firstly, the photothermal evaporator can provide an efficient resource utilization path for biomass thermal conversion byproducts. Secondly, the unique reversible structure can realize periodic switching of the working surface during operation, and relying on the self-cleaning mechanism of the alternating cycle, the photothermal evaporator can realize continuous and stable treatment of high-concentration brine, and effectively overcome the performance degradation problem caused by salt accumulation of a traditional solar interface evaporator.

This invention relates to the field of water treatment technology, specifically to a method for adsorbing heavy metals in copper-containing wastewater. The method includes: preparing a modified chitosan composite material; preparing a composite fiber filter membrane; preparing composite hydrogel microspheres; and treating the copper-containing wastewater. This invention first dissolves chitosan and mixes it with nano-ferric oxide to form a physical coating, imparting magnetic responsiveness to the chitosan. Then, it modifies the chitosan using 1,3,5-phenyltricarboxylic acid and triethylenetetramine. A three-dimensional network cross-linked structure is constructed by reacting glutaraldehyde with the amino groups of chitosan and triethylenetetramine to produce modified chitosan. Finally, graphene oxide is loaded onto the surface and pores of the modified chitosan through impregnation and drying to obtain a modified chitosan composite material. When this material is added to pretreated wastewater, it can significantly improve the adsorption capacity for copper ions in copper-containing wastewater.

The application discloses antistatic polyester fiber prepared based on polyester regeneration and preparation of blended yarn thereof, and belongs to the technical field of polyester fiber processing, and is used for solving the technical problem that the antistatic property, moisture absorption and diffusion performance and mechanical strength of the blended yarn material composed of regenerated polyester fiber and cotton fiber in the prior art need to be further improved, and specifically comprises regenerated polyester fiber, a PDA modification layer and a hydrophilic polar coating layer wrapped outside the regenerated polyester fiber, the application is to recycle waste polyester to prepare sulfonate modified PET, and then melt spinning is performed on the sulfonate modified PET, polyethylene terephthalate and ethylene-vinyl acetate copolymer, a stable hydrophilic polar coating layer is formed by using polydopamine and chitosan deposition and glutaraldehyde crosslinking, and then the hydrophilic polar coating layer is blended with cotton fiber, so that the comprehensive optimization of the breaking strength, breaking elongation, surface resistivity, crease recovery angle and drop diffusion time and other performances of the blended yarn and fabric is realized.

This invention discloses a flame-retardant, tough, conductive, porous hydrogel, its preparation method, and its applications, belonging to the field of hydrogel materials technology. The method involves solid-state mixing of polyvinyl alcohol and tannic acid, liquid-phase preparation of MXene and glutaraldehyde dispersions, followed by solid-liquid crosslinking, washing, and then composite with silver paste, carbon fiber cloth, and a PDMS membrane to obtain a composite material. Key parameters such as the amount of MXene added and the crosslinking time were optimized. The resulting hydrogel has a porous structure and exhibits excellent flame retardancy, toughness, and hygroscopicity. It can generate a water voltaic voltage during moisture absorption and dripping. The composite structure further enhances its power generation performance, and its electrical output is modulated by temperature and humidity, dripping volume, solution ion concentration, and polarity. This invention solves the problems of short battery life, mechanical mismatch, and poor air permeability in traditional smart textile materials, and has promising application prospects in smart textile fields such as fabric weaving and the manufacture of new sensors.

This invention relates to the agricultural field, specifically to a method for preparing and applying a carbon dioxide fusion element trap. It addresses the problem that polymeric film-forming agents added to foliar fertilizers easily form a continuous, dense, and impermeable physical film on the leaf surface, making it difficult for carbon dioxide to enter, interfering with normal photosynthesis and transpiration, and thus causing abnormal leaf metabolism. The method involves immersing mesoporous silica microspheres in a PEI solution to obtain PEI-loaded microspheres, then adding a solution of gelatin, chitosan, glycerol, and glutaraldehyde to deionized water to form a composite gel base solution. Finally, selenomethionine, seaweed oligopeptides, and yeast extract are mixed with the composite gel base solution in warm water to obtain the carbon dioxide fusion element trap. This invention, through careful material selection and structural design, cleverly achieves a balance between strong adhesion and high permeability, allowing it to firmly adhere to the leaf surface and eliminating the defect of clogging leaf stomata.

The application provides a pH-responsive composite coating modified aqueous zinc negative electrode and a preparation method thereof, and relates to the technical field of electrode materials of aqueous zinc ion batteries.The pH-responsive composite coating modified aqueous zinc negative electrode comprises a zinc foil substrate and a pH-responsive composite coating arranged on the surface of the zinc foil substrate; the pH-responsive composite coating is a polyethyleneimine-polyacrylonitrile composite three-dimensional porous nanofiber coating, which is formed by depositing a polyethyleneimine-polyacrylonitrile composite spinning solution on the surface of the zinc foil substrate through electrospinning and crosslinking and solidifying the polyethyleneimine amine group through glutaraldehyde vapor; wherein the polyacrylonitrile forms a nanofiber skeleton support structure, the polyethyleneimine provides active functional groups containing primary amines and secondary amines, and the composite coating is given a pH regulation function.The zinc negative electrode obtained by the application has the advantages of good interface stability, strong corrosion resistance, good dendrite inhibition effect and high cycle stability, and is suitable for the field of aqueous zinc ion battery energy storage.

The application relates to the technical field of biomedical materials, and specifically discloses a preparation method of a double-crosslinked 3D-printed bone repair scaffold. The scaffold is made of a biphasic calcium phosphate matrix and a gelatin methacrylate hydrogel outer layer. The preparation method comprises the following steps: firstly, preparing biphasic calcium phosphate ink, and constructing a porous scaffold blank through 3D printing; then, carrying out double-crosslinking treatment of calcium chloride solution and glutaraldehyde solution in sequence to obtain a scaffold matrix with enhanced mechanical properties; then, preparing gelatin methacrylate hydrogel loaded with modified teriparatide, and compounding the gelatin methacrylate hydrogel with the scaffold matrix; and finally, obtaining the final product after blue light crosslinking and solidification. The bone repair scaffold has good biocompatibility and osteogenic activity, and can effectively promote bone defect repair. In addition, the preparation method is controllable and has good repeatability, the structure of the scaffold is accurately controlled through the 3D printing technology, and a new approach is provided for the preparation of personalized bone repair materials.

This invention discloses a method for preparing a wall-mounted magnetic nanoparticle-immobilized enzyme microreactor. The method first involves encapsulating Fe3O4 nanoparticles with polydopamine. Utilizing the self-polymerization properties of dopamine, a uniform polydopamine coating layer rich in active groups is formed on the surface of the Fe3O4 nanoparticles. This provides a high-density reaction site for subsequent activation with a silanizing agent (3-aminopropyltriethoxysilane, APTES) and cross-linking with glutaraldehyde (GA). Subsequently, through multi-level surface functionalization modification involving 3-aminopropyltriethoxysilane activation and glutaraldehyde cross-linking, efficient and stable immobilization of CALB is achieved, while simultaneously endowing the immobilized enzyme with excellent magnetic separation performance, thermal stability, and storage stability. This invention features a simple process, easy operation, and easy recovery.