391 results about "Cellulose acetate" patented technology

The invention discloses a preparation method of a cellulose acetate / thermoplastic polyurethane / polypyrrole composite conductive nanofiber aerogel composite pressure sensing material. The preparation method comprises the following steps: (1) preparing a cellulose acetate and thermoplastic polyurethane spinning solution; (2) preparing a cellulose acetate / thermoplastic polyurethane composite nanofiber membrane; (3) preparing cellulose acetate / thermoplastic polyurethane short nano dispersion liquid; (4) preparing a cellulose acetate / thermoplastic polyurethane / polypyrrole polymerization solution; and (5) preparing the cellulose acetate / thermoplastic polyurethane / polypyrrole composite conductive nanofiber aerogel. According to the preparation method, a high-temperature thermal annealing process is not needed, and the prepared nanofiber composite aerogel has high conductivity, ultralow volume density, high compression deformation performance and high pressure resistance sensing sensitivity.

The invention discloses environmentally degradable plastic as well as a preparation method and application thereof, and belongs to the technical field of degradable plastic. The degradable modified plastic is prepared from the following raw materials: polylactic acid, poly (butylene terephthalate)-adipate, modified thermoplastic starch, modified cellulose, poly (butylene succinate), epoxidized soybean oil, polyvinyl alcohol, glycerol monolaurate and ethylenediaminetetraacetic acid. Wherein the modified thermoplastic starch is obtained by thermoplastic modification of starch through a plasticizer and modification of castor oil and toluene diisocynate; the modified cellulose is obtained by modifying cellulose acetate with chitosan. By regulating and controlling the types and proportions of the raw materials for preparing the plastic, the plastic with excellent degradation performance and mechanical performance can be obtained, the shopping bag is prepared from the plastic, the loading capacity can be remarkably improved, the plastic is easily degraded by microorganisms in the environment after being discarded, and environmental pollution is avoided.

The invention discloses a micropore-rich carbon adsorbent and application thereof in separation of mixed gas of sulfur hexafluoride and nitrogen, and the micropore-rich carbon adsorbent is prepared by taking cellulose acetate as a precursor, performing low-temperature pre-carbonization treatment in an inert atmosphere, mixing with KOH, performing high-temperature activation in the inert atmosphere, and finally washing and drying. The carbon adsorbent prepared by a unique two-step method of low-temperature pre-carbonization and high-temperature activation has an extremely high specific surface area (1100-1700m < 2 > / g) and a pore channel structure mainly comprising micropores (the pore diameter is concentrated in 0.5-0.8 nm). The adsorbent shows ultrahigh adsorption capacity (the adsorption capacity can reach 2.83 mmol / g at the temperature of 25 DEG C and the pressure of 0.1 bar) on SF6. The carbon adsorbent disclosed by the invention is simple in preparation method, low in raw material cost and environment-friendly, and has a wide application prospect in the field of SF6 recovery and purification.

The invention belongs to the technical field of textile material processing, and particularly discloses a preparation method of high-strength low-shrinkage composite yarn for spinning. A preparation method of a high-strength low-shrinkage composite yarn for spinning comprises the following steps: (1) respectively drying ultra-high molecular weight polyethylene and PET polyester, adding maleic anhydride grafted PE, a treated metal organic framework material, boron carbide nanoparticles, cellulose acetate and a silane coupling agent KH550, uniformly mixing, and carrying out melt extrusion to obtain nascent fibers; (2) performing first-stage pre-drafting, second-stage high-temperature tension field drafting and third-stage low-temperature relaxation treatment on the nascent fiber to obtain treated fiber; and (3) dipping the treated fiber in an ethanol solution containing nano SiO, and performing infrared radiation curing to obtain the high-strength low-shrinkage composite yarn for spinning. The composite yarn has good mechanical strength, wear resistance and low contractibility, and the yarn has wide application due to the high breaking strength.

The invention belongs to the technical field of radioactive wastewater treatment and uranium extraction from seawater, and discloses a high-flux cellulose immobilized tannin membrane adsorption material as well as a preparation method and application thereof. The membrane adsorption material comprises an aldehyde cellulose acetate microfiltration membrane and waxberry tannin which is cured on the microfiltration membrane through gradient cross-linking. The membrane adsorption material provided by the invention keeps a reticular porous structure of a cellulose microporous filter membrane and has the characteristics of high flux and rapid mass transfer, the pure water flux of a single-layer membrane can reach 300 L / (m.h), the treatment capacity of a multi-layer membrane is remarkably increased, large-flow treatment can be realized, and the efficiency of extracting uranium from seawater or uranium-containing wastewater is remarkably improved.

The present invention addresses the problem of providing: a display device having both visibility and folding resistance after a key test; an optical film; and a method for manufacturing the optical film. This display device has at least a light-emitting element and a color filter, and is characterized in that the display device has an optical film containing cellulose acetate and a filler of a metal oxide or a metal salt, the degree of substitution of acetyl groups in the cellulose acetate is within the range of 2.3-3.0, and the degree of substitution of acetyl groups in the cellulose acetate is within the range of 2.3-3.0. The metal oxide or metal salt filler has an aspect ratio in the range of 110-2000.

The application relates to the technical field of batteries, in particular to a composite solid electrolyte membrane and a preparation method and application thereof. The composite solid electrolyte membrane comprises the following layers which are sequentially stacked: a first membrane layer comprising a polymer, a solid electrolyte and a lithium salt; a second membrane layer comprising a polymer, a solid electrolyte and a lithium salt; and a third membrane layer which is an interface layer; wherein the solid electrolyte and the lithium salt content of the second membrane layer are higher than those of the first membrane layer, and the polymer is formed by polymerization of raw materials comprising triacetyl cellulose (TCA) and polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP). The composite solid electrolyte membrane has improved high-temperature resistance and good ion transmission performance.

The invention provides a directional moisture absorption and sweat releasing functional fabric and a preparation method thereof.The fabric comprises a sweat releasing and drying layer, a capillary moisture guiding layer and a hydrophilic moisture absorption layer from outside to inside, the hydrophilic moisture absorption layer is a cellulose acetate electrostatic spinning super-hydrophilic modified layer, the capillary moisture guiding layer is formed by weaving porous polyester yarn, and the hydrophilic moisture absorption layer is a super-hydrophilic modified cellulose acetate electrostatic spinning super-hydrophilic modified cellulose acetate electrostatic spinning super-hydrophilic modified cellulose acetate electrostatic spinning super-hydrophilic modified cellulose acetate electrostatic spinning super-hydrophilic modified fiber. The perspiration drying layer is a silane super-hydrophobic modified layer. Porous cross-section polyester fibers are prepared by adopting a washable template method, the moisture conductivity is improved, an electrostatic spinning cellulose acetate nanofiber membrane is subjected to super-hydrophilic modification, the sweat absorption rate is increased, the skin-friendly performance is improved, a sweat-releasing and drying layer is subjected to silane hydrolysis spraying and then heat treatment to form a super-hydrophobic siloxane coating, the surface dryness is enhanced, and the moisture absorption rate is increased. Unidirectional migration and rapid evaporation of sweat from inside to outside are achieved.

This invention discloses a cellulose acetate-based 1,8-naphthalenedimide fluorescent probe for detecting hydrazine, its preparation method, and its application. The invention uses 4-bromo-1,8-naphthalenedimide as a raw material, which undergoes a condensation reaction with 4-aminobutyric acid to obtain 4-(4-bromo-1,8-naphthalenedimide)butyric acid (BNA-B); BNA-B undergoes a coupling reaction with 4-formylphenylboronic acid to obtain 4-(4-(4-formylphenyl)-1,8-naphthalenedimide)butyric acid (FNA-B); compound FNA-B then undergoes an esterification reaction with cellulose acetate (CA) to obtain the cellulose acetate-based 1,8-naphthalenedimide fluorescent probe FNA-B-CA. This compound specifically recognizes hydrazine. Under 365 nm ultraviolet light irradiation, the addition of hydrazine to a DMF / H2O solution of FNA-B-CA changes the fluorescence color of the solution from bright blue to colorless, indicating a detection limit of 8.4 × 10⁻⁶ for hydrazine. ‑8 M has promising applications as a fluorescent probe for the detection of hydrazine.

The invention provides a composite fiber membrane, which comprises a composite fiber base membrane with a cross-linked structure, the composite fiber base membrane comprises cellulose acetate, the cross-linked structure is formed by a reaction of closed water-based isocyanate and the cellulose acetate, and the surface of the composite fiber base membrane is grafted with an acrylate structure. A cross-linked structure formed by the reaction of the cellulose acetate and the closed water-based isocyanate can accelerate the dissociation of lithium ions and promote the transmission of the lithium ions, so that the transmission rate of the lithium ions is increased; the acrylate structure grafted on the surface of the composite fiber base membrane can reduce the crystallinity of the solid electrolyte and improve the ionic conductivity of the solid electrolyte. The invention further discloses a preparation method of the composite fiber membrane, a solid-state battery and a preparation method of the solid-state battery.

The invention discloses a self-powered flexible sensor and a preparation method thereof, and belongs to the field of electronic skin, man-machine interaction, flexible electronic devices and sensors. The invention relates to a cellulose acetate-based ionic gel self-energized flexible sensor which is prepared from cellulose acetate, ionic liquid, a polymer monomer, a cross-linking agent and an initiator and has good mechanical property and antibacterial property, the cellulose acetate enhances the mechanical property of the gel through non-covalent crosslinking, and the ionic liquid plays a conductive role. The flexible sensor has good conductivity, high sensitivity and stability, and can be stretched, twisted and bent. Meanwhile, the high transparency and excellent biocompatibility can be realized, so that the electronic skin can be used as the electronic skin for multifunctional perception and integrated application. The material is environment-friendly, the preparation method is simple, the operability is high, the application field is wide, and the prospect is wide.

The invention discloses an aroma enhancement filter stick for cigarettes, a binary aroma enhancement filter stick for cigarettes, a preparation method and application. The method for preparing the aroma-enhancing filter stick for the cigarettes comprises the following steps: frying, fermenting and carrying out steam explosion treatment on fresh tea leaves in sequence; drying, crushing and screening the fresh tea leaves subjected to steam explosion treatment to obtain solid spices; and mixing the solid spice with the cigarette cellulose diacetate tow to prepare the cigarette aroma enhancement filter stick. When the aroma enhancement filter stick for the cigarette and the binary composite aroma enhancement filter stick for the cigarette are applied to the cigarette, the smoking experience can be remarkably improved. The composite fragrance such as rich flower fragrance, sweet fruit fragrance, spicy fragrance, costustoot fragrance, green fragrance and cocoa fragrance can be endowed to smoke, and the fragrance is rich, full and distinct in gradation; meanwhile, the smoke can be endowed with unique cool and refreshing feeling and fresh and sweet feeling, the freshness of the smoke is remarkably optimized, and the irritation is effectively reduced.

The invention relates to the technical field of pharmaceutical preparations, and discloses a high-drug-loading risperidone sustained release microsphere for subcutaneous injection and a preparation method thereof, and the preparation method comprises the following steps: mixing risperidone, polylactic acid and dichloromethane to obtain an oil phase; dissolving a pore-forming agent in water to obtain a pore-forming agent solution; mixing polyvinyl alcohol, sodium chloride and water to obtain a water phase; mixing the oil phase with the pore-forming agent solution to obtain primary emulsion; mixing and stirring the primary emulsion and a water phase until dichloromethane is completely volatilized to obtain microspheres loaded with speridone; mixing cellulose acetate, polyethylene glycol and an organic solvent to obtain a coating solution; and coating the risperidone-loaded microspheres with a coating solution to obtain the high-drug-loading risperidone sustained-release microspheres capable of being used for subcutaneous injection. According to the invention, the efficient drug loading is realized, the injection comfort is improved, the slow permeation and release of the drug are realized, and the onset speed and the long-acting treatment demand are balanced.

The application discloses a preparation method of superfine nanofiber antibacterial and mosquito-repellent high-efficiency low-resistance air filtration membrane, which comprises the following steps: dissolving cellulose acetate, cinnamyl aldehyde and polyhexamethylene biguanide hydrochloride in a solvent, fully stirring to form a spinning solution, wherein the solvent is a mixed solution of acetone, N, N-dimethylacetamide and water; and performing electrostatic spinning on the spinning solution to obtain the superfine nanofiber antibacterial and mosquito-repellent high-efficiency low-resistance air filtration membrane. The manufacturing steps of the application are simple and not complicated; cellulose acetate has excellent mechanical properties, hydrophobicity and thermal stability, and is an ideal material for air filtration membrane; the liquid property of cinnamyl aldehyde can effectively dilute cellulose acetate, so that the overall binding energy of the mixed solution system is reduced, the diameter of the prepared fiber is reduced, and meanwhile, the mild binding force of cinnamyl aldehyde minimally affects the interaction between cellulose acetate molecules.

The invention relates to a preparation method of a degradable cellulose acetate-based nanofiber membrane with high-efficiency photocatalytic performance, which comprises the following steps: based on a green and environment-friendly concept, taking degradable cellulose acetate as a substrate, and adding zinc oxide / tin oxide heterojunction nanoparticles which are prepared by a one-step sintering method and have high-efficiency photocatalytic performance into the substrate; and the nanofiber membrane is prepared through electrostatic spinning. The nanofibers are uniform in thickness, and the surface roughness of the membrane is improved after the heterojunction nanoparticles are added, so that the hydrophilicity is improved. After oil-water separation, the problem of oil contamination blockage is effectively solved by utilizing the photocatalytic performance of the heterojunction nano-particles, and meanwhile, compared with a single-photocatalyst oil-water separation membrane, the recombination rate of photon-generated carriers is reduced through synthesis of the heterojunction nano-particles, and the photocatalytic performance is effectively improved. The prepared degradable cellulose acetate-based nanofiber membrane with the efficient photocatalytic performance has a good separation effect on various oil-in-water emulsions, and the rejection rate of the degradable cellulose acetate-based nanofiber membrane can reach 99% or above.

The invention discloses conductive nanofiber aerogel, a flexible piezoresistive sensor and a preparation method and application of the flexible piezoresistive sensor. Comprising the following steps: preparing a cellulose acetate nanofiber membrane by adopting an electrostatic spinning method, then homogenizing and dispersing the cellulose acetate nanofiber membrane, and adding the cellulose acetate nanofiber membrane into a polyvinyl alcohol solution to obtain a mixed dispersion liquid; an oxidizing agent and protonic acid are added into the mixed solution, aniline is added after precooling, and conductive gel is obtained through in-situ polymerization reaction; finally, the conductive nanofiber aerogel with directional holes is prepared through directional freeze drying. The nanofiber and the polyvinyl alcohol are used for constructing a composite aerogel skeleton, and the hydrogen bond interaction between the nanofiber and the polyvinyl alcohol can effectively enhance the mechanical property, the stability and the rebound resilience of the aerogel. A sensor prepared by packaging the aerogel has the advantages of wide detection range, high sensitivity, good stability, short response time and the like, can accurately monitor human body movement, and has potential application value in the fields of wearable equipment, human-computer interaction, smart medical treatment and the like.

The application discloses an electronic skin-oriented conductive silver paste and a preparation method and application thereof, and relates to the technical field of flexible printed electronic materials.The raw materials of the electronic skin-oriented conductive silver paste include flaky silver powder, silver nanoparticles, thermoplastic polyurethane elastomer, acrylic elastomer, PEDOT:PSS microgel dispersion, (3-glycidylpropoxy)trimethoxysilane, polydiallyldimethylammonium chloride, hexanedial modified dopamine copolymer, (3-aminopropyl)triethoxysilane, methacryloyloxypropyltrimethoxysilane, cellulose acetate, modified polyurea thixotropic agent, hydrogenated castor oil, ethylene glycol ether acetate, dibasic acid ester, leveling agent and water.The electronic skin-oriented conductive silver paste has the advantages of good electrical performance, good mechanical-electrical stability, good anti-electromigration and sweat corrosion resistance, and can still maintain dendrite-free and low drift under long-term coupling of sweat and bias, and is suitable for electronic skin.

The invention discloses an antibacterial antifouling cellulose acetate self-supporting ultrafiltration membrane and a preparation method thereof.The preparation method comprises the steps that a cationic monomer, an anionic monomer and a cross-linking agent are added into a polar solvent, and a pre-reaction is conducted in the protective atmosphere under the catalyst condition to obtain a prepolymer solution; adding cellulose acetate and a pore-foaming agent into the prepolymer solution, and stirring for reaction to obtain a composite membrane casting solution; a substrate is coated with the composite membrane casting solution in a blade mode, the substrate is placed in a coagulating bath to be subjected to non-solvent induced phase conversion to form a membrane, and then thermocuring treatment is conducted to obtain the ultrafiltration membrane. A cationic monomer and an anionic monomer are introduced into a cellulose acetate polymer main chain through a cross-linking reaction, so that the mechanical and chemical stability of the membrane is improved; a cationic monomer group and an anionic monomer group are cooperatively introduced to construct an electrically neutral hydration layer, so that the adhesion of pollutants and microorganisms is remarkably reduced; the cationic monomer with a quaternary ammonium salt structure is anchored through covalence, has long-term stable contact sterilization capability, and inhibits the growth of bacteria.

The invention relates to the technical field of batteries, in particular to a composite solid electrolyte membrane and a preparation method and application thereof. The composite solid electrolyte membrane comprises the following layers which are stacked in sequence: a first membrane layer which comprises a polymer, a solid electrolyte and a lithium salt; the second film layer comprises a polymer, a solid electrolyte and a lithium salt; the third film layer is an interface layer; wherein the solid electrolyte content and the lithium salt content of the second film layer are both higher than the solid electrolyte content and the lithium salt content of the first film layer, and the polymer is formed by polymerizing raw materials including cellulose triacetate (TCA) and polyvinylidene fluoride-hexafluoropropylene (PVDF-HFP). The composite solid electrolyte membrane has improved high temperature resistance and good ion transmission performance.

The utility model discloses a heat-resistant flame-retardant ultrathin acetate cloth adhesive tape which comprises an adhesive tape reel, release paper is arranged on the outer side of the adhesive tape reel, an adhesive tape body is wound on the outer side of the release paper, the adhesive tape body comprises an acetate fiber layer, an outer flame-retardant layer is arranged on one side of the acetate fiber layer, and the outer flame-retardant layer is arranged on the other side of the acetate fiber layer. An anti-static layer is arranged on the side, away from the cellulose acetate fiber layer, of the outer flame-retardant layer, a waterproof layer is arranged on the side, away from the outer flame-retardant layer, of the anti-static layer, a fireproof coating is arranged on the side, away from the anti-static layer, of the waterproof layer, a wear-resistant layer is arranged on the side, away from the waterproof layer, of the fireproof coating, and an inner flame-retardant layer is arranged on the side, away from the outer flame-retardant layer, of the cellulose acetate fiber layer. A tensile layer is arranged on one side, far away from the cellulose acetate fiber layer, of the inner flame-retardant layer. The acetate cloth adhesive tape is high in pulling resistance and good in fireproof and flame-retardant capacity, the phenomenon that electrical equipment is damaged due to high temperature can be effectively reduced, and the use safety of the electrical equipment is improved.

The invention discloses an excitation wavelength dependent macromolecular super-strong cellulose-based intelligent packaging material and a preparation method thereof. The film material is prepared by doping less than 0.002% (w / w) of a chromophore into a biopolymer. The chromophore is 1-amino anthraquinone or disperse red 60. The biopolymer is at least one of cellulose acetate, starch, chitosan and polylactic acid. Dropwise adding the chromophore solution into the biopolymer solution, and stirring for 0.5-3 hours; and pouring the mixture into a glass plate, placing in a constant-temperature box, evaporating the solvent, and stripping to obtain the film. The excitation wavelength-dependent cellulose-based intelligent packaging film material is applied to manufacturing of OLED (Organic Light Emitting Diode), intelligent electronics and intelligent packaging materials as well as protection of ultraviolet rays and management of visible light.

An unheated-type aerosol-generating article comprises a tobacco medium filled in at least one of a cellulose acetate filter and a paper filter, wherein the tobacco medium comprises: granules including tobacco powder; and an aqueous PH-adjusting solution including a pH adjusting agent and moisture, and the tobacco medium may contain 8-9 wt% of moisture with respect to the dry weight of the tobacco medium.

The invention discloses an HPCACM-coated Co3O4 composite material as well as a preparation method and application thereof. The preparation method comprises the following steps: preparing rice straw source cellulose; preparing rice straw source cellulose acetate (CA); preparing a hollow porous cellulose acetate fiber membrane (HPCAFM); preparing a hollow porous cellulose acetate derived carbon fiber membrane (HPCACM); and preparing the HPCACM-coated Co3O4 composite material. The prepared HPCACM-coated Co3O4 composite material is prepared based on straw, has a high specific surface area and a unique micro-mesoporous hierarchical structure, provides a rich active interface for a catalytic reaction, is beneficial to promoting mass transfer of reactants and products, efficiently activates potassium hydrogen persulfate, realizes high-value utilization of agricultural wastes, and improves the water pollution treatment efficiency.

This invention provides a rapid preparation method for steel samples for transmission electron microscopy (TEM), relating to the field of physical analysis of steel materials. It is applied to the preparation of various steel samples, including heat-sensitive steels, using a composite binder of cellulose acetate, acetone, silica, and alumina. The binder is used to adhere one side of a wire-cut steel sample sheet to the sheet fixing surface of a grinding aid. A grinding aid area, parallel to the bottom surface of the sheet fixing surface, is provided on the grinding aid device. The grinding aid area is pressed, and sandpaper with progressively increasing grit is used to grind one side until a first preset thickness is reached. Then, the other side is switched, and sandpaper with progressively increasing grit is used to grind the second side until a second preset thickness is reached. The ground sheet is removed, thinned, punched, and electropolished to obtain the target steel sample. This invention can rapidly prepare steel sample sheets with a thickness of 30-50 µm, and the method is simple and has a high success rate.

The invention relates to a method for preparing cellulose acetate based on a micro-flow field technology. Dissolving the cellulose raw material in the ionic liquid to obtain a cellulose solution, and mixing the supported protonic acid catalyst and the cellulose solution to obtain a material A; the esterifying agent is marked as a material B; and respectively pumping the material A and the material B into a micro-flow field reactor for esterification reaction to obtain the cellulose acetate. According to the method, a micro-flow field reaction technology is innovatively adopted, and a new green and continuous cellulose acetate synthesis path is constructed through high-efficiency mixing and mass (heat) transfer reinforcement under a micro scale and precise control of a cellulose acylation reaction.

Disclosed are improved methods for inspecting tow for contamination, defects, and / or imperfections, for example cellulose acetate tow. The present disclosure can also relate to processes for producing cellulose acetate tow that involve detecting and analyzing contamination, defects, and / or imperfections in the tow. The methods can result in cellulose acetate that has fewer contamination, defects, and / or imperfections than has been previously achieved.

The invention belongs to the technical field of polyacrylamide hydrogel, and discloses rapid temperature-sensitive response polyacrylamide composite hydrogel as well as a preparation method and application thereof. The preparation method comprises the following steps: dissolving N-isopropylacrylamide NIPAM, acrylic acid AA, [2-(methylacryloyloxy)-ethyl] dimethyl-(3-sulfopropyl) SBMA, an initiator and a chemical cross-linking agent in an amphiphilic cellulose acetate WSCA solution, mixing and stirring until a uniform and transparent hydrogel precursor solution is formed, and carrying out cross-linking polymerization on the obtained hydrogel precursor solution to obtain the hydrogel. Finally, the polyacrylamide composite hydrogel with rapid temperature-sensitive response is generated, and the polyacrylamide composite hydrogel is marked as the WSCA-PNSA composite temperature-sensitive hydrogel. The composite thermosensitive hydrogel provided by the invention has a phospholipid-like characteristic, so that the PNIPAM hydrogel has high thermosensitive driving force while realizing rapid thermal shrinkage, skin functional recovery can be promoted, and rapid and scar-free wound healing is realized.

The present invention provides a novel graft polymer composition which contains a graft polymer of cellulose acetate and a lactone and which achieves both excellent thermoplasticity and suppression of bleed out.　Provided is a polymer composition which contains a graft polymer of cellulose acetate and a lactone, wherein the proportion of a methanol-soluble material of the polymer composition as measured via the method below is in the range of 13-33 mass%. (Method for measuring proportion of methanol-soluble material) Under atmospheric pressure, in a 20°C environment, acetone is dissolved in 144 ml with respect to 24 g of the polymer composition, 1.5 L of methanol is added, and stirring is carried out for 12 hours. A mixture thus obtained is filtered with a PTFE membrane filter having a pore diameter of 1 μm, and a filter residue is collected. The obtained filter residue is put into 0.5 L of methanol again, and stirring is carried out for 1 hour. A mixture thus obtained is filtered with a PTFE membrane filter having a pore diameter of 1 μm, and a filter residue and a filtrate are collected. The obtained filter residue is put into 0.5 L of methanol again, and stirring is carried out for 1 hour. A mixture thus obtained is filtered with a PTFE membrane filter having a pore diameter of 1 μm, and a filter residue and a filtrate are collected. After the pH of the filtrate is confirmed to be 7, the filter residue is added to 1 L of methanol, and stirring is carried out for 12 hours. A mixture thus obtained is filtered with a PTFE membrane filter having a pore diameter of 1μm, and a filter residue is collected. The obtained filter residue is dried at 40°C for 12 hours in a vacuum, and a dry mass is thus obtained. From the dry mass of the polymer composition before purification and the dry mass of the polymer composition after the purification, the proportion of the methanol-soluble material contained in the polymer composition is calculated. Methanol-soluble component of polymer composition = dry mass of polymer composition before purification - dry mass of polymer composition after purification Proportion of methanol-soluble material contained in polymer composition = (mass of methanol-soluble component of polymer composition) / dry mass of polymer composition after purification × 100 (mass%)

The present application provides a cellulose / acetyl cellulose composite fiber and a preparation method thereof, the preparation method comprising the following steps: mixing and crushing cellulose pulp and acetyl cellulose sheets, adding a low-concentration NMMO solution and a surfactant for stirring and impregnation, and obtaining a suspension after the material is fully mixed and impregnated; obtaining a blending spinning solution after the suspension is subjected to two-stage reduced-pressure evaporation and dehydration; and spinning the blending spinning solution by dry-jet wet spinning to obtain the composite fiber. The composite fiber prepared by the present application has the performance advantages of lyocell fiber and acetyl cellulose, excellent mechanical properties, and improved fibrillation performance. The fabric has the advantages of air permeability, skin friendliness, moisture absorption, easy drying, comfort, natural degradation, green environmental protection, and good application prospect in high-end textiles and garments.

The invention discloses a production process of a cellulose acetate fiber fabric containing natural fragrance, a solvent formed by mixing a modified polymer, 2, 4, 6-trimethylbenzoyl-diphenyl phosphine oxide, a modified microcapsule and dimethylformamide is subjected to dry spinning to prepare the cellulose acetate fiber fabric, and the weight part ratio of the modified polymer to the modified microcapsule is (70-80): (6-8). The preparation method comprises the following steps: by taking an isocyanate group on excessive hexamethylene diisocyanate as a reaction site, firstly reacting with an intermediate containing dihydroxyl, and then reacting with cellulose acetate containing free hydroxyl, so as to prepare the modified polymer. The halamine structure on the molecular chain can destroy cell membranes, enzyme systems or genetic materials through oxidation. The modified capsule has a lavender essential oil and cinnamon essential oil double-component double-capsule-wall structure, the fragrance durability can be improved, the copper sulfide nanoparticles and quaternized chitosan structures can destroy the bacterial cell structure, and the antibacterial performance of the material is improved.