173 results about "Dimethylacetamide" patented technology

The application relates to a preparation method of a hollow fiber membrane composite thermal insulation material, which comprises the following steps: adding 18-22% of polyurethane, 4-8% of polyethylene glycol 2000 and 72-76% of N,N-dimethylacetamide into a spinning reaction kettle to mix, stir and defoam to prepare homogeneous casting solution; based on a non-solvent induced phase separation method, the homogeneous casting solution is coated on the surface of a polyester braided tube through a spinneret by adopting a concentric circle composite spinning technology, is gathered on a spinning wheel after a coagulation bath to form a reinforced polyurethane hollow fiber membrane assembly which is arranged in parallel and obliquely crosses and is mutually bonded, and the fiber membrane assembly is hot-pressed to prepare the hollow fiber membrane composite thermal insulation material under the conditions of a temperature of 60-150 DEG C and a pressure of 120-470 MPa. Since the coating layer and the braided tube are both through porous structures, the prepared composite material has good air permeability.

The invention relates to a polyimide composite film for realizing high-dispersion carbon nanotubes through chemical anchoring and a preparation method of the polyimide composite film, which are used for solving the problems that carbon nanotubes in the existing carbon nanotube / polyimide composite material are easy to agglomerate, poor in interfacial compatibility and low in grafting efficiency. The preparation method comprises the following steps: S1, ultrasonically dispersing aminated carbon nanotubes in anhydrous dimethylacetamide to obtain a stable dispersion liquid; s2, slowly dropwise adding pyromellitic dianhydride into the stable dispersion liquid under an ice bath condition, and enabling the pyromellitic dianhydride to react with the aminated carbon nanotubes under the assistance of triethylamine to form anchor points; s3, adding a diamine monomer 4, 4 '-diaminodiphenyl ether, and gradually adding the residual pyromellitic dianhydride to carry out in-situ polymerization; and S4, preparing a wet film by adopting a curtain coating or spin coating method, and carrying out step-by-step thermal imidization at 80-300 DEG C to obtain the covalent composite film. Controllable covalent connection of the carbon nanotubes and pure polyimide chain segments can be achieved on the molecular level, and therefore the composite film with excellent heat conductivity, electromagnetic shielding performance and mechanical performance is obtained.

The present application relates to photosensitive polyimide oligomer, preparation method and polyimide photosensitive resin composition prepared by the same, the present application provides the molecular formula of photosensitive polyimide oligomer, which is prepared from 1, 4, 5, 8-naphthalene tetracarboxylic anhydride, N, N-dimethylacetamide, triethylamine, tetramethyl benzene dimethyl diisocyanate, hydroquinone methyl ether, dibutyl tin dilaurate and hydroxyethyl acrylate according to the molar ratio of 2.5:10-15:1.2-1.6:3.0:0.0035-0.0045:0.007-0.01:2-2.5.The good solubility group is introduced into the molecular structure, so that it has good solubility in active diluent, and the polyimide oligomer can be photocured reaction;The device printed by the polyimide photosensitive resin composition prepared by the same has small shrinkage, high precision, and has the excellent performance of photosensitive polyimide oligomer, and has certain toughness and excellent weather resistance.

A process to produce cellulose ester fibers is provided, the process comprising: a. mixing cellulose ester and at least one solvent at a temperature ranging from about 60 ℃ to less than 90 ℃ to produce a cellulose ester dope; wherein the solvent comprises N, N-dimethylformamide, N, N-dimethylacetamide, or dimethyl sulfoxide, or mixtures thereof; and b. spinning the cellulose ester dope through at least one spinneret to produce the cellulose ester fibers; wherein the cellulose ester fibers have improved color over cellulose ester fibers produced from dope mixed outside about 60 ℃ to less than 90 ℃.

The invention discloses a catalyst for synthesizing 1, 3-dioxane-2-ketone as well as a preparation method and application of the catalyst. The catalyst is prepared from the following components in percentage by mass: 60wt%-90wt% of a component A, 5wt%-20wt% of a component B and 5wt%-30wt% of a component C, wherein the component A is one or more of N, N-dimethyl formamide, N, N-dimethylacetamide, N, N-diethyl formamide and urea, and the component B is one or more of N, N-dimethyl formamide, N, N-dimethylacetamide, N, N-diethyl formamide and urea; the component B is one or more of lithium carbonate, sodium carbonate, potassium carbonate, cesium carbonate, calcium carbonate and magnesium carbonate; and the component C is 1-butyl-3-methylimidazolium tetrafluoroborate and / or 1-butyl-3-methylimidazolium hexafluorophosphate, and the component C is 1-butyl-3-methylimidazolium hexafluorophosphate. According to the present invention, the components of the catalyst have the mutual synergistic promotion effect, the reaction substrate can be adsorbed and activated, the reaction condition is mild, the product yield is high, the catalyst can be recovered and regenerated, and the environmental pollution is low.

The invention relates to the technical field of production of flurala drops, in particular to a flurala drop preparation method based on online monitoring. The preparation method comprises the following preparation processes: sequentially adding weighed dimethylacetamide and acetone into a liquid preparation tank, adding fluralana and tetrahydrofuran polyglycol ether into the liquid preparation tank, stirring until the materials are uniformly mixed, monitoring raw material data, production data and product data by using a monitoring and collecting system in the preparation process, and recording and storing the raw material data, production data and product data through a monitoring and recording system. Data collected by the monitoring and collecting system is used as a reference, production is controlled and commanded through the monitoring and controlling system, and the monitoring and recording system records and stores the data and sends the data to the monitoring and analyzing system for statistical analysis and machine learning training. Key links such as raw material parameters, environmental process parameters and intermediate product and finished product quality data are monitored online in real time through the monitoring and collecting system, the production dynamic state is comprehensively mastered, and it is guaranteed that all procedures are strictly executed according to the process requirements.

This invention employs a washing solution containing solvents and metal removal agents. The washing solution contains two or more solvents, the distance between the Hansen solubility parameter of the washing solution and the Hansen solubility parameter of dimethylacetamide (HSP distance) is less than 1.0, and the content of metal impurities is 0.1 × 10⁻¹¹ parts by mass relative to the total of 100 parts by mass of the aforementioned solvents and metal removal agents. ‑9 10 or more by weight 2 ×10 ‑6 The amount is less than a certain percentage by weight. The washing solution described herein can improve the removal of impurities and dirt.

This application discloses a crystal, a rare-earth-doped crystal, its preparation method, and its applications, belonging to the field of crystal materials. The chemical formula of the crystal is [Gd(L)]. 1.5 (DMA)] n Formula I; in Formula I, L is a ligand formed by deprotonated benzene polycarboxylic acid; benzene polycarboxylic acid is selected from any one of terephthalic acid, phthalic acid, and isophthalic acid; DMA is N , N -Dimethylacetamide; n ∞ represents continuous repetition and infinite extension. The crystal is rare-earth doped, and the chemical formula of the rare-earth doped crystal is [Gd]. 1‑x% (L) 1.5 (DMA)] n :x% Ln 3+ Equation II; in Equation II, x = 0.1~10; Ln 3+ Selected from Tb 3+ Or Eu 3+ Any one of the following. It has potential application value in fields such as fluorescent materials, multicolor display materials, long afterglow materials, X-ray detection and imaging materials, radiation detection dosimeters, and optical information encryption. The preparation method used in this application can be easily achieved through solution reaction under relatively mild conditions, with low cost and strong industrial feasibility.

The invention belongs to the field of novel functional polymer materials, and discloses a preparation method of a selenium-containing polymer material capable of fixing metal ions, and the preparation method comprises the following steps: S1, adding PTMEG into a round-bottom reaction flask filled with inert gas, and placing the round-bottom reaction flask in an oil bath pan for melting; s2, MDI, dimethylglyoxime, DSe and anhydrous N, N-dimethylacetamide are sequentially added and fully mixed; s3, stannous octoate and CuCl2 are added at the same time; s4, keeping the temperature of the oil bath pan and continuously reacting; s5, after the reaction is finished, a polymer is precipitated out, and secondary cleaning is conducted through methyl alcohol. The preparation method has the advantages that oximido is introduced into a polyurethane molecular structure to fix metal ions, meanwhile, selenium is introduced in a covalent fixation mode, and through double-site introduction of the metal ions and the selenium, the molecular structure of the polyurethane is greatly improved; the NO catalytic release rate of the material can be regulated and controlled, so that the biocompatibility and applicability of the polymer material in a blood environment are improved, and the application scene is further widened.

The application belongs to the field of detection reagents, and particularly relates to a single-component luminol chemiluminescence substrate liquid and a preparation method thereof. The single-component luminol chemiluminescence substrate liquid comprises the following components: sodium acetate, sodium perborate, N-N dimethylacetamide, beta-cyclodextrin, luminol, 4-morpholinopyridine, p-acetylaminophenol, 4-hydroxyphenylacetic acid, phenothiazine-10-yl-propyl sulfonic acid sodium salt and isothiazolinone. The purpose of the application is to solve the technical defects that the luminol chemiluminescence substrate liquid in the prior art must be packaged in two components due to the instability of the luminous agent and the oxidizing agent in the liquid phase, leading to inconvenient use and easy introduction of operation errors, so as to provide a single-component luminol chemiluminescence substrate liquid and a preparation method thereof, which have high storage stability, high luminous performance and convenient use.

The invention relates to a preparation method of a Co-based MOF material constructed based on H3BTTC. The preparation method comprises the following steps: adding a ligand and a metal salt into N, N-dimethylacetamide through a conventional solvothermal synthesis method, adding a tetrafluoroboric acid aqueous solution to adjust the pH value and polarity of the solution, heating and crystallizing in a drying oven, washing a product with a solvent for multiple times, and carrying out vacuum drying to obtain a target material. The method can accurately regulate and control pore channels, conditions are mild and efficient, the performance of the material in the fields of gas adsorption and separation, catalysis, sensing and the like is effectively improved, and the remarkable advantages are enhanced.

The embodiment of the invention discloses a polymer electrolyte for a magnesium battery and the magnesium battery. The polymer electrolyte consists of a eutectic solvent, a cross-linking agent and a photoinitiator, the eutectic solvent is any one of a Mg (TFSI) 2 / N-methylformamide system or a MgCl2 / 2-chlorine-N, N-dimethylacetamide system, and N-methylformamide or 2-chlorine-N, N-dimethylacetamide is a hydrogen bond donor in the eutectic solvent; the crosslinking agent is polyethylene glycol diacrylate, and the photoinitiator is 2, 2-dimethoxy-2-phenyl acetophenone. According to the polymer electrolyte provided by the invention, high ionic conductivity, excellent electrochemical stability and good magnesium ion reversible deposition and dissolution performance are realized, the cycling stability is enhanced, the structural stability is also considered, and the polymer electrolyte has excellent reversibility and application potential in a magnesium battery; and the cycling stability and the energy efficiency of the magnesium battery can be obviously improved.

The application discloses a drainage bag with an antibacterial functional layer and a preparation process thereof, and relates to the technical field of medical materials, and comprises the following steps: adding modified montmorillonite into N, N'-dimethylacetamide, uniformly mixing through ultrasonic, adding a polyurethane film, ultrasonic immersion for 60-120 min, drying, and obtaining a drainage bag substrate; adding polylactic acid into N, N-dimethylformamide, uniformly stirring and mixing, adding modified nano zinc oxide, uniformly mixing through ultrasonic, and then performing electrospinning to obtain an antibacterial coating fiber film; placing the antibacterial coating fiber film on the inner side surface of the drainage bag substrate, high-frequency heat sealing, assembling, and obtaining the drainage bag.

This invention relates to the field of fine chemical catalysis technology, specifically to an improved ion-gel confined palladium-on-carbon catalyst, its preparation method, and its applications. The catalyst uses N,N-dimethylacetamide (DMAc) as a solvent and potassium acetate as a base, with the addition of a catalytic amount of antioxidant 168 [(tris(2,4-di-tert-butylphenyl) phosphite)], and the reaction is carried out under milder CO pressure (1.0-1.6 MPa) and temperature (90-110 °C). This improved catalyst, in synergy with the optimized process, unexpectedly enables the high conversion and selectivity of 4-bromobenzyl sulfone derivatives to 4-methylsulfonylbenzoic acid derivatives, while maintaining the catalyst's excellent recyclability and stability. This invention provides a highly efficient, green, and easily industrialized synthetic route for the target product.

This invention discloses a PVDF-modified ultrafiltration membrane based on a tannic acid crosslinking network, its preparation method, and its applications. The membrane is prepared by a phase inversion membrane fabrication method using polyethyleneimine, tannic acid, polyvinylidene fluoride (PVDF), and N,N-dimethylacetamide (NDM). The pyrogallol structure abundant in the tannic acid molecule can coordinate with metal ions and also form a robust covalent crosslinking network with the amine-rich polyethyleneimine through Michael addition and Schiff base reactions. This network firmly anchors TA to the membrane surface and pores, solving the problem of TA loss in traditional modifications. The introduction of TA imparts lasting hydrophilicity to the membrane, significantly improving pure water flux and separation efficiency. Simultaneously, the hydrophilic and positively charged surface synergistically constructed by TA and PEI effectively inhibits the adsorption and deposition of pollutants, endowing the membrane with excellent antifouling performance and operational stability. This PVDF membrane, prepared through a green and simple co-crosslinking strategy, shows broad application prospects in complex water treatment and bioseparation.

This invention belongs to the field of lithium-ion battery material regeneration technology, specifically relating to a non-destructive separation and direct regeneration repair method for waste lithium-ion battery cathode materials. The invention involves discharging waste lithium-ion pouch batteries in a sodium chloride solution, then disassembling the pouches. The resulting cathode sheets are immersed in a mixed solution of oxalic acid and N,N-dimethylacetamide for peeling. The resulting waste cathode material powder is mixed with an anhydrous ethanol solution containing dissolved lithium sheets and phosphates for lithium replenishment. The first batch of cathode material is then mixed with lithium salts and ball-milled. The resulting ball-milled mixture is calcined to obtain regenerated cathode material. The method provided by this invention can effectively destroy the PVDF-aluminum interface anchor points while maintaining the integrity of the cathode material structure and aluminum foil surface. The cathode material peeling is complete, resulting in high separation efficiency, meeting the requirements of efficient, low-pollution, and recyclable lithium battery regeneration processes.

The invention belongs to the field of separation and filtration, and particularly relates to a filtering membrane with aperture sizes in gradient arrangement and a preparation method thereof. The preparation method comprises the following steps: (1) preparing a membrane casting solution: mixing and dissolving dimethylacetamide, polyether sulfone, polyethylene glycol and an auxiliary agent, and defoaming to obtain the membrane casting solution; (2) preparing core liquid: mixing dimethylacetamide with water to obtain the core liquid; (3) preparing a gel bath: mixing dimethylacetamide with water to obtain the gel bath; the concentration of the gel bath is smaller than that of the core liquid; and (4) preparing the filter membrane: enabling the membrane casting solution to be in contact with the core solution and the gel bath through a spinneret plate, and enabling membrane filaments to pass through the gel bath to a filament collecting tank, so as to obtain the filter membrane of which the pore sizes are arranged in a gradient manner. The pore diameter of the filtering membrane is changed from a large pore diameter on one side to a small pore diameter on the other side in a gradient manner, and the filtering membrane has high retention rate and high flux, high mechanical strength, easy cleaning and low energy consumption.

According to the invention, a cleaning solution containing a solvent and a metal remover is adopted. The cleaning solution contains two or more solvents, and the distance (HSP distance) between the Hansen solubility parameter of the cleaning solution and the Hansen solubility parameter of dimethylacetamide is 1.0 or less. The total content of an organic substance selected from the group consisting of an organic acid polymer, an organic acid ester, and a ketone body is from 0.1 * 10 <-9 > parts by mass to 105 * 10 <-6 > parts by mass (inclusive) per 100 parts by mass of the total of the solvent and the metal remover. According to the washing liquid, the removal performance of organic impurity dirt can be improved.

The invention discloses meta-aramid fibrid and a preparation method thereof, the meta-aramid fibrid comprises, by dry weight, 90.0-99.5 wt% of meta-aramid resin and 0.5-10.0 wt% of an amphiphilic block copolymer additive, and the additive comprises at least one of p-N-methyl pyrrolidone or N, N-dimethyl pyrrolidone or N, N-dimethyl pyrrolidone or N, N-dimethyl pyrrolidone or N, N-dimethyl pyrrolidone or N, N-dimethyl pyrrolidone or N, N-dimethyl pyrrolidone or N, N-dimethyl pyrrolidone or N, N-dimethyl pyrrolidone or N, N-dimethyl pyrrolidone. A first block having an affinity for N, N-dimethylacetamide; and at least one second block having an affinity for water. The preparation method comprises the following steps: adding an additive into a meta-aramid resin polymerization liquid to form a composite resin polymerization liquid; injecting the composite liquid into a precipitation bath composed of N-methyl pyrrolidone or N, N-dimethylacetamide and water through a dispersing device, and after precipitation, carrying out solid-liquid separation, washing and drying to obtain the fibrid. Through the synergistic effect of a specific additive and a precipitation bath system, the microstructure of the fibers is actively regulated and controlled, and the specific surface area and the surface roughness of the fibers are improved, so that the tensile strength and the internal bonding strength of finished paper are remarkably enhanced, and meanwhile, the inherent high-temperature-resistant, flame-retardant and insulating properties of meta-aramid fibers are kept.

The invention discloses an aramid fiber composite material and a preparation method thereof. The method comprises the following steps: (1) preparing an aramid polyanionic polymer solution as a two-dimensional material adhesive; (2) coating an aramid fiber matrix with the aramid fiber polyanionic polymerization liquid, so that the surface of the aramid fiber matrix is covered with the adhesive; and (3) immersing the aramid fiber matrix covered with the adhesive into the two-dimensional material dispersion liquid, drying and curing to obtain the aramid fiber composite material, the aramid fiber polyanionic polymer solution is a mixed solution containing an aramid fiber polymer, dimethylacetamide and strong base. And on the premise of not introducing foreign impurities, the preparation of the aramid fiber composite material can be quickly realized.

The invention relates to a preparation method of a hollow fiber gas separation membrane for decarburization of oilfield associated gas, and belongs to the technical field of separation membranes, and the preparation method specifically comprises the following steps: mixing 4, 4 '-diaminodiphenyl sulfone with diamine under the protection of argon, and then adding a solvent N, N-dimethylacetamide; after diamine is completely dissolved, dianhydride is added in batches until a polyamide acid prepolymer solution is obtained through stirring; adding a dehydrating agent and a catalyst into the polyamide acid prepolymer solution to generate a polyimide solution; the preparation method comprises the following steps: mixing dianhydride with sulfuryl-containing diamine, then adding the sulfuryl-containing diamine into a reaction solution, then pouring the reaction solution into a precipitant methanol to separate out a polymer, washing and drying to obtain a polyimide solid, then preparing the polyimide solid into a membrane casting solution, and carrying out a spinning process to obtain the hollow fiber gas separation membrane. And the hollow fiber gas separation membrane is prepared by spinning, so that the molecular chain structure is optimized, and the comprehensive performance of the material is improved.

The invention relates to the technical field of composite materials, in particular to a low-temperature medium leakage prevention carbon fiber composite material with self-repairing and self-adaptive sealing functions and a preparation method and application thereof. The preparation method of the composite material comprises the following steps: S1, adding 4, 4 '-diaminodiphenyl ether and 3, 5-diaminobenzoic acid-3-trifluoromethyl phenyl ester into dimethylacetamide, stirring, then adding 4, 4'-hexafluoroisopropyl phthalic anhydride, stirring, heating to room temperature, and continuously stirring to obtain fluorine-containing side chain polyimide; adding an MXene dispersion liquid into the fluorine-containing side chain polyimide to obtain a polyimide adhesive film layer, S2, preparing a carbon fiber bearing layer; s3, adding an aromatic disulfide bond repairing agent into water, then adding isophorone diisocyanate and polyether amine for reaction, and then mixing with polyethylene glycol terephthalate to prepare a self-repairing impermeable layer; s4, preparing a double-layer gradient film; and S5, preparing the carbon fiber composite material.

The application discloses submicron silver powder and a preparation method and application thereof, and belongs to the technical field of metal conductive powder.The preparation raw material of the submicron silver powder comprises an oxidizing agent, a reducing agent, a dispersing agent, a coating and settling agent and a twin crystal inhibitor; the oxidizing agent comprises at least one of silver nitrate, silver nitrite, silver carbonate and silver oxalate; the reducing agent comprises at least one of ascorbic acid, glucose, sodium borohydride, hydrazine hydrate and formaldehyde; the coating and settling agent comprises at least one of lauric acid, myristic acid, palmitic acid and stearic acid; and the twin crystal inhibitor comprises at least one of N,N-dimethylformamide, dimethyl sulfoxide, acetonitrile, hexamethylphosphorus triamide and dimethylacetamide; while effectively improving the dispersibility of the submicron silver powder, the twin crystal inhibitor restrains the growth of the eutectic face of the silver powder crystal, reduces the amount of the organic dispersing agent and improves the use performance of the silver powder at the slurry end.

This invention relates to the field of battery technology, and more particularly to a non-aqueous electrolyte, a lithium-ion battery, a battery module, a battery pack, and an electrical device. The non-aqueous electrolyte comprises a lithium salt, a non-aqueous organic solvent, and functional additives. The functional additives include compounds with the structure shown in Formula I and other additives; R1 and R2 are each independently selected from carbonyl, amide, and dimethylacetamide groups; R3, R4, R5, and R6 are each independently selected from hydrogen and fluorine; n is selected from 1 to 3; other additives are selected from one or more combinations of lithium difluorosulfonylimide, lithium trifluoromethanesulfonate, lithium fluorosulfonate, 2-propynyl methanesulfonate, methanedisulfonate methylene, fluoroethylene carbonate, spiroethylene sulfate, vinylene carbonate, and 1,3-propanesulfonate lactone. This invention, through the synergistic effect of compounds with the structure shown in Formula I and other additives, improves the low-temperature performance, rate performance, and cycle performance of lithium batteries.

A process to produce cellulose ester fibers is provided, the process comprising: a. mixing cellulose ester and at least one solvent at a temperature ranging from about 60℃ to less than 90℃ to produce a cellulose ester dope; wherein the solvent comprises N, N-dimethylformamide, N, N-dimethylacetamide, or dimethyl sulfoxide, or mixtures thereof; and b. spinning the cellulose ester dope through at least one spinneret to produce the cellulose ester fibers; wherein the cellulose ester fibers have improved color over cellulose ester fibers produced from dope mixed outside about about 60℃ to less than 90℃.

The present application relates to the technical field of layered composite fabric, and particularly relates to a layered composite fabric based on waterproof and weather-resistant coating, a preparation method and application. The layered composite fabric comprises an outer fabric and an inner fabric, the inner fabric is a bamboo cotton fabric, and the outer fabric is a nylon fabric with a waterproof and weather-resistant coating, which is prepared by impregnating treatment of a bio-based nylon fabric in a composite finishing agent and solidification. The composite finishing agent is prepared by the following steps: including the following method: reacting diisocyanate, polyether polyol, bio-based polyester polyol and hydroxyl-terminated polydimethylsiloxane in N,N-dimethylacetamide to obtain a polyurethane prepolymer solution; adding N-octadecyl diethanolamine for chain extension reaction; adding bromo-n-butane for quaternization reaction; and finally adding a composite weather-resistant additive, stirring to obtain the composite finishing agent.

The invention provides a preparation method of an arsenic removal adsorbent, which comprises the following steps: preparing Bi (OH) 3-BiOOH blended powder, mixing the Bi (OH) 3-BiOOH blended powder with polyacrylonitrile and N, N-dimethylacetamide, dripping into small balls through a ball dripping device, drying, reacting with a mixed solution of CuCl2 and CeCl3, drying, reacting with a saturated tannic acid solution, and drying to obtain the arsenic removal adsorbent. The invention also provides application of the arsenic removal adsorbent in water treatment, especially in adsorption of trivalent arsenic and pentavalent arsenic in wastewater. The arsenic removal adsorbent disclosed by the invention has the advantages of high adsorption rate, high selectivity, high adsorption capacity and high cycle stability on pentavalent arsenic-containing ions and trivalent arsenic-containing ions in a water body, and is simple in synthesis process and beneficial to industrial production, application and popularization.

The invention discloses polymer PI fiber heat preservation cotton and a preparation method thereof.The heat preservation cotton comprises an inner layer, a middle layer and an outer layer, the inner layer comprises PI fibers and polyvinyl alcohol fibers, the middle layer comprises the PI fibers and skin-core composite fibers, and the outer layer comprises the PI fibers, aramid fibers and low-melting-point fibers; the middle layer PI fiber is a modified PI fiber, and the preparation of the modified PI fiber comprises the following steps: under a nitrogen protection atmosphere, polymerizing pyromellitic dianhydride and 4, 4 '-diaminodiphenyl ether in N, N-dimethylacetamide to obtain a polyamide acid solution; adding phenylacetylene-terminated hyperbranched polysiloxane, fluorinated graphene oxide, a surfactant and a pore-forming agent into the polyamide acid solution, and reacting to obtain a modified polyamide acid spinning solution; and carrying out dry spinning and thermal forming treatment on the modified polyamide acid spinning solution to obtain the modified PI fiber. The obtained heat preservation cotton has the characteristics of heat preservation, washing resistance and comfort.

The invention relates to the technical field of western blot membranes, in particular to a high-strength western blot membrane based on nanofiber network interpenetration and a preparation method thereof.The high-strength western blot membrane comprises the following raw materials: a polyvinylidene fluoride membrane matrix, a nanofiber skeleton, a pore-foaming agent, an N, N-dimethylacetamide cosolvent and coagulating bath; the preparation method comprises the following steps: selecting a cellulose nanofibril aqueous dispersion with the concentration of 2wt%, carrying out hydrophobic modification on the cellulose nanofibril aqueous dispersion through octyl triethoxy silane, and taking the modified cellulose nanofibril aqueous dispersion as a nanofiber skeleton; the pore-foaming agent is a compound mixed solution of polyvinylpyrrolidone and PEG-400 (Polyethylene Glycol). The cellulose nanofibrils are subjected to surface hydrophobization modification, and a compound pore-foaming agent system is introduced, so that the mechanical property and the porous structure of the membrane are considered, and the good porosity of the membrane is maintained while the overall strength of the membrane is enhanced.

According to the method, an auxiliary solvent N, N-dimethylacetamide (DMAC) is added into a precursor solution for hydrothermal deposition of the antimony sulfide thin film to adjust the deposition rate, so that the thickness of the thin film is optimized, the morphology of the thin film is improved, the crystallinity is improved, the defect density of the thin film is reduced, and the performance of a device is improved. The antimony sulfide solar cell comprises a conductive substrate (including FTO and the like), an electron transport layer, an antimony sulfide solar cell absorption layer and a counter electrode. The DMAC can promote grain polymerization of the antimony sulfide thin film, increase the grain size and reduce electric leakage channels of the solar cell. And DMAC has the effect of adjusting the deposition rate, so that the reaction is slower to obtain a more appropriate thickness of the absorption layer. By constructing an effective antimony sulfide thin film solar cell structure, the device performance of the antimony sulfide solar cell is improved.