671 results about "Fluorine free" patented technology

The invention relates to the technical field of layered composite fabrics, and discloses a light-absorbing and heat-emitting chinlon fabric, a preparation method and application of the light-absorbing and heat-emitting chinlon fabric to thermal fabrics. According to the invention, the fluorine-free and waterproof light-absorbing and heating finishing agent with excellent light-absorbing and heating performance is prepared, then the sulfydryl silane modified chinlon single-layer fabric is subjected to surface finishing by adopting the light-absorbing and heating finishing agent through sulfydryl-alkene click reaction, and the prepared light-absorbing and heating chinlon single-layer fabric is used as the surface layer fabric; the light-absorbing and heating chinlon fabric obtained by compounding the light-absorbing and heating chinlon fabric with the inner layer made of the acrylic fiber / special-shaped section chinlon blended yarn not only has excellent light-absorbing and heating performance, but also has good waterproof performance of the surface layer, good warm-keeping performance of the inner layer and good wearing comfort, and can be applied to warm-keeping fabrics.

The invention discloses a fluoride-free reinforced wear-resistant polyketone composite material as well as a preparation method and application thereof, and relates to the technical field of polymer composite materials. The fluoride-free reinforced wear-resistant polyketone composite material comprises polyketone resin, glass fibers, modified ultra-high molecular weight polyethylene, an antioxidant and a lubricant, wherein the modified ultra-high molecular weight polyethylene is obtained by modifying branched-chain-free linear polyethylene with the molecular weight of 2 million or more, and the dosage of the modifier is 1%-5% of that of the ultra-high molecular weight polyethylene. The modified ultra-high molecular weight polyethylene, the glass fiber and the polyketone resin are subjected to blending modification, and the characteristics of good wear resistance of the polyketone resin and high strength of the glass fiber are combined; meanwhile, the friction coefficient is low after the ultra-high molecular weight polyethylene is modified, the compatibility with the polyketone resin is enhanced, the dispersion is more uniform, and the heat resistance and friction performance of the polyketone resin are comprehensively improved. In addition, due to the use of fluorine-free, the safety of the polyketone composite material is improved, and meanwhile, the application market of the polyketone composite material is expanded.

The invention discloses a fluoride-free flotation-microbiological leaching-multistage magnetic separation synergistic tailing purification process, which takes mine tailings as raw materials and is realized by the following steps: 1, fluoride-free flotation desliming and impurity removal: replacing hydrofluoric acid with a novel anion collector (fatty acid derivative), and preferentially removing mica and feldspar under the condition that the pH is 2.5-3.5; 2, removing iron and aluminum by microbiological leaching: leaching for 48 hours at the temperature of 35 DEG C by utilizing an acidophilus bacillus ferroxidans bacterial solution, and dissolving Fe2O3 and Al2O3 in a wrapped state; 3, high-gradient magnetic separation refining: removing magnetic minerals through 1.2 T strong magnetic separation, and then separating weak magnetic impurities through 0.8 T weak magnetic separation; the indexes of the final product are as follows: the purity of SiO2 is greater than or equal to 99.9%, the whiteness is greater than or equal to 94% (ISO standard), the content of Fe2O3 is less than or equal to 80ppm, Al2O3 is less than or equal to 1200ppm, and the requirements of electronic grade (IOTA-4 standard) quartz powder are met.

The invention discloses a polyetherketoneketone high-temperature-resistant wear-resistant non-stick coating and a preparation method thereof. The coating is prepared from the following components in parts by mass: 13 to 30 parts of a resin matrix group (containing 12 to 25 parts of titanium modified polyether ketone ketone resin, 1 to 5 parts of fluorine-free viscous resin and 0.65 to 6 parts of aluminum oxide), 0.5 to 3 parts of a nano reinforced group (containing 0.5 to 3 parts of KH-550 modified nano titanium dioxide, 0.025 to 0.6 part of cerium dioxide and 0.5 to 3 parts of boron nitride) and 62 to 71 parts of an auxiliary agent group. The preparation method comprises the following steps: 1) taking diphenyl ether, paraphthaloyl chloride and isophthaloyl chloride as monomers, and synthesizing titanium modified polyether ketone ketone resins with different viscosities through segmented polymerization (1.5-2.0 hours or 3.0-4.0 hours); 2) respectively preparing a smooth bottom layer water dispersion slurry and a wrinkled surface layer water dispersion slurry; and (3) forming a compact bottom layer and a micro-wrinkle surface layer on the base material by adopting a layered spraying and stepped sintering process (280-320 DEG C, 10-20 minutes). The whole system of the coating is fluorine-free and has temperature resistance gt; the coating has the characteristics of high temperature resistance (350DEG C), wear resistance (Taber wear rate of 3-5mg / 1000r), non-sticking (contact angle gt, 100 DEG C) and heavy corrosion resistance, and is suitable for cooking utensils and chemical equipment.

The invention discloses a long-chain alkyl acrylate polymer dispersion liquid which is composed of a long-chain alkyl acrylate polymer, alcoholic hydroxyl-terminated long-chain alkyl silicone oil, a surfactant, a cosolvent and water. The long-chain alkyl acrylate polymer at least comprises a long-chain alkyl acrylate monomer unit and a monomer unit containing an active hydroxyl group; and the alcoholic hydroxyl-terminated long-chain alkyl silicone oil accounts for 15-40% of the total mass of the long-chain alkyl acrylate polymer and the alcoholic hydroxyl-terminated long-chain alkyl silicone oil. The fluorine-free fabric finishing agent dispersion liquid is good in stability and excellent in continuous processing performance when waterproof processing is carried out on fabrics, and the fabrics treated by the fluorine-free fabric finishing agent dispersion liquid are excellent in waterproof performance and good in washability.

The invention relates to the technical field of finishing agents, and discloses a fluoride-free leather water-repellent finishing agent and a preparation process thereof. The preparation method comprises the following steps: reacting hydrogen-containing silicone oil, N-methylallylamino hydroxypropyl alkane and a bromoalkane monomer to obtain hydroxyl quaternary ammonium salt silicone oil; the fluorine-free leather water-repellent finishing agent contains hydrophobic silicone oil and a plurality of alkyl long carbon chains, and the hydrophobic silicone oil and the alkyl long carbon chains are introduced into a polyurethane molecular chain through a polymerization chain extension reaction, so that the hydrophobic and water-repellent properties of the polyurethane finishing agent and the leather are remarkably improved, and the water-repellent property of the leather is improved. And the hydroxyl quaternary ammonium salt silicone oil contains an organosilane quaternary ammonium salt antibacterial group which is introduced into a polyurethane molecular chain, so that the finishing agent and the leather are endowed with excellent antibacterial performance.

The invention discloses a method for recovering high-purity fluorine and silicon from fluorine-silicon slag and co-producing a low-alkali fluorine-free accelerator, which comprises the following steps: S1, dissolving the fluorine-silicon slag in a sodium hydroxide solution to obtain a solution A; s2, adding dilute sulphuric acid into the solution A, reacting until gel is obtained, and filtering to obtain filtrate A and high-purity silicon dioxide gel; s3, adding calcium sulfate and EDTA (Ethylene Diamine Tetraacetic Acid) into the filtrate A, stirring and reacting, and filtering after the reaction is finished to obtain calcium fluoride and filtrate B; and S4, taking clear water, heating, carrying out heat preservation, then adding aluminum sulfate, lithium sulfate, diethanol amine and the filtrate B obtained in S3, continuously stirring until the aluminum sulfate is completely dissolved, then adding hydrated magnesium silicate, continuously carrying out heat preservation stirring, and obtaining the low-alkali fluorine-free accelerator after stirring is finished. The method is simple in process and easy to implement industrially, and fluoride and silicon oxide obtained through separation are high in purity and beneficial to follow-up extension application; more importantly, high-value recycling of the fluorosilicon slag is achieved, and the problems of stockpiling waste and environmental pollution of the fluorosilicon slag are solved.

The invention discloses a self-repairing chromium-free passivator, a preparation method thereof and application of the passivator in the field of corrosion prevention of alloy workpieces. The passivating agent is composed of a bifunctional silane coupling agent, a fluoride-free inorganic film-forming agent, an organic film-forming agent, a corrosion inhibition synergistic system, a nano-composite reinforcing system, self-repairing microcapsules, an anti-biological adhesion component and a functional auxiliary agent. The problems that an existing passivating agent contains chromium or fluorine, environmental protection risks exist, the self-repairing function is lost, a base material is corroded, and the process efficiency is low are solved. The passivating agent is free of chromium and fluorine, the adhesive force of the passivating agent and a zincizing / multi-component alloy co-permeation layer is larger than or equal to 7 MPa, the neutral salt mist resistance is larger than or equal to 1700 h, the self-repairing efficiency after a film layer is damaged is larger than or equal to 85%, the single-batch period of the preparation technology is smaller than 1 h, and the passivating agent is suitable for large-scale application in severe scenes such as railways and oceans.

The invention discloses a high-temperature-resistant anti-adhesion superhard transparent fluorine-free green organic silicon coating and a preparation method thereof, and belongs to the technical field of organic silicon coatings. According to the invention, methyltrimethoxysilane, silica sol, hydroxyl silicone oil, isopropanol and water are used as raw materials to prepare a high-temperature-resistant anti-adhesion superhard transparent fluorine-free green organic silicon coating, and a design strategy of manufacturing a nanoscale polysiloxane coating through an organic silicon precursor controllable sol-gel hydrolysis process is adopted. According to the present invention, the coating with the matrix completely composed of the in-situ generated nano SiO2 particles is prepared, the defect minimization and the highly-crosslinked Si-O-Si network structure are achieved, the nano-scale inorganic structure has long-term thermal stability, and the visible light transmittance of the coating can achieve 98% due to the inhibition of the light scattering by the sub-wavelength particle size; and tiny nano particles are uniformly and tightly arranged on the surface of the coating, so that the coating is endowed with ultrahigh hardness. In addition, the coating still maintains the inherent antifouling property of the organic silicon coating.

The application provides a wear-resistant transparent flexible fluorine-free super-hydrophobic composite coating and a preparation method thereof. The preparation method comprises the following steps: mixing and reacting hydroxyl-terminated polydimethylsiloxane, gamma-aminopropyl triethoxysilane and dibutyl tin dilaurate to obtain a modified precursor solution, adding swelled epoxy resin into the modified precursor solution, and obtaining a siloxane modified epoxy resin after heating reaction; dispersing nano-silicon dioxide in an ethyl acetate solution to form a SiO2 suspension; uniformly mixing the modified epoxy resin and the SiO2 suspension, adding polyether amine as a curing agent, and stirring and mixing, and then adopting an air spraying mode to build an epoxy resin / hydroxyl-terminated polydimethylsiloxane / nano-silicon dioxide super-hydrophobic coating on a substrate. The preparation method can prepare a super-hydrophobic coating with excellent transparency and flexibility, good adhesion and wear resistance, and has a wide application prospect in the fields of wearable electronic devices and optoelectronic devices.

The invention relates to the technical field of textile functional finishing agents, and discloses a low-temperature forming soft-handfeel polyurethane fluoride-free fabric waterproof agent as well as a preparation method and application thereof. The polyurethane fluoride-free fabric waterproof agent is prepared from the following components in percentage by mass: 10 to 20 percent of polyurethane polymer, 2 to 10 percent of polyurethane modified organic silicon, 10 to 20 percent of solvent, 2 to 5 percent of organic cosolvent, 1 to 5 percent of emulsifier, 50 to 70 percent of deionized water and 0.2 to 1 percent of pH regulator. The polyurethane fluoride-free waterproof agent is mainly applied to fabric treatment, can be formed at a low temperature, and has the advantages of good water repellency, low hand scratch, soft hand feeling, high coating stripping performance and the like.

A polymer processing aid (PPA) reduces melt defects in extruded polyolefins in the absence of fluoropolymers. A polymer processing aid comprising a block copolymer having polyamide blocks and polyether blocks reduces melt defects well in a thermoplastic polyolefin such as a linear low density polyethylene (LLDPE). Inclusion of an adjuvant PPA comprised of polycaprolactone, or polycaprolactone diol polymer further improves the melt fracture behavior in a thermoplastic and in the absence of fluoropolymers.

The invention discloses a preparation method of a fluoride-free oil-proof agent for paper pulp molding, and relates to the field of oil-proof agent preparation. The preparation method comprises the following steps: adding a nonionic and cationic surfactant, a thickening agent, a bio-based functional additive, a cross-linking agent and a polymerizable siloxane coupling agent into water, heating and stirring, emulsifying with molten wax, homogenizing at high pressure, then adding a preservative and an anti-settling agent, and reacting at room temperature to obtain the wax emulsion with small particle size and stable structure. The prepared product has excellent storage stability, oil-proof performance and washable performance, does not stratify after centrifugation and long-term storage, and meets the green and environment-friendly requirements.

The invention discloses a flame-retardant PA66 material and a preparation method thereof.The flame-retardant PA66 material is prepared from, by weight, 80-100 parts of a modified PA66 material, 3-5 parts of modified graphene, 15-30 parts of a flame-retardant additive and 0.1-0.5 part of tetraphenylphosphorus bromide, a molecular chain of the flame-retardant additive contains an organic silicon chain segment and an organic phosphorus structure and is doped with nitrogen and boron elements, and when the material is burnt, the flame-retardant PA66 material has a flame-retardant effect, and the flame-retardant PA66 material has a flame-retardant effect. The organic phosphorus can be dehydrated to form a phosphoric acid carbon layer, the nitrogen element can release inert gas, dilute combustible gas and generate an expansive phosphorus-nitrogen carbon layer with the organic phosphorus, the boron element can improve the compactness and high-temperature stability of the carbon layer, and the organic silicon can form a cross-linked network shape, so that the continuity of the carbon layer is improved; a fluorine-containing polysiloxane chain segment of a side chain of the flame-retardant additive is embedded among molecules of the modified PA66 material, and is decomposed to generate fluorine free radicals during combustion, and active free radicals in a combustion chain reaction are quenched, so that a rapid flame-retardant effect is achieved.

The invention provides a one-way moisture-conducting skin-like fabric and a preparation method thereof.The one-way moisture-conducting skin-like fabric comprises a hydrophilic silicon dioxide layer, a fabric layer and a hydrophobic silicon dioxide layer from the front face to the back face, and the hydrophobic silicon dioxide layer and the hydrophilic silicon dioxide layer form a gradient wettability structure in the thickness direction of the fabric; the gradient wettability structure simulates skin sweat glands to achieve one-way spontaneous transportation of liquid drops from the back face to the front face, and the liquid drops cannot permeate in the reverse direction. Fluorine-free hydrophobic treatment is performed on the fabric through sulfydryl-alkene click reaction, a hydrophilic nano pit structure is introduced into a porous area on the front surface of the fabric through gummed paper covering plasma treatment, a gradient wetting interface is formed, and directional sweat transportation without external force driving is realized.

This invention discloses a method for preparing a fluorine-free superhydrophobic nano-silica cotton fabric, belonging to the field of superhydrophobic textile technology. The invention utilizes trichlorooctadecylsilane (OTS), γ-glycidyl etheroxypropyltrimethoxysilane (KH-560), and hexadecyltrimethoxysilane (HDTMS) to modify silica, obtaining a fluorine-free superhydrophobic coating. This coating, applied to the surface of the cotton fabric, results in a fabric with both low surface energy and a rough surface structure, exhibiting excellent superhydrophobic properties. Furthermore, it also imparts durability, self-cleaning, and stain-resistant capabilities to the hydrophobic coating.

The invention belongs to the technical field of ferrous metallurgy and material modification, and particularly relates to a preparation method of green short-process hot work die steel, which comprises the following steps: obtaining scrap steel, adding alloy, and smelting to obtain molten steel; the molten steel is refined through fluoride-free rare earth refining slag, and refined molten steel is obtained; adding a nanoparticle modifier into the refined molten steel to obtain modified molten steel; and the modified molten steel is subjected to continuous casting or die casting, and the hot work die steel is obtained. According to the method, the fluorine-free rare earth slag refining and nano particle modification combined technology is adopted, fluorine-containing refining slag and traditional electroslag remelting are effectively replaced, power consumption and carbon emission in the smelting process are reduced, the technical development requirements of current green manufacturing and dual-carbon targets are met, and green short-process manufacturing of the hot work die steel is achieved; and the prepared hot work die steel has higher cleanliness, a more uniform organization structure and more excellent thermal fatigue performance.

The application provides a plant oil modified fluorine-free anti-fingerprint transparent coating material and a preparation method and application thereof, and belongs to the technical field of anti-fingerprint coating materials.The plant oil modified fluorine-free anti-fingerprint transparent coating material is prepared from an organic silicon modified polyurethane acrylate prepolymer, plant oil, a photoinitiator, an organic solvent and hydrophobic nanoparticles, and is formed through ultraviolet light curing.The prepared organic silicon modified polymer coating has low surface energy and environmental protection, can be rapidly photocured to reach a surface dry state under ultraviolet light irradiation, improves production efficiency, and has transparency, excellent hydrophobic effect and anti-fingerprint performance.The results of the examples show that the water contact angle is more than 100 degrees, the light transmittance is more than 80 percent, and the anti-fingerprint performance of removing fingerprint marks by wiping with a paper towel for 3 times or less.

The invention discloses a fluorine-free fast-charging electrolyte, a preparation method thereof and an application of the electrolyte in a high-temperature lithium battery, and belongs to the technical field of electrolytes. The electrolyte comprises a fluoride-free organic solvent, a fluoride-free lithium salt and a fluoride-free additive, wherein the concentration of the fluorine-free lithium salt ranges from 0.6 mol / L to 1.4 mol / L, and the concentration of the fluorine-free additive ranges from 0 wt% to 10 wt%. The fluorine-free electrolyte is formed by using a fluorine-free organic solvent, a fluorine-free lithium salt and a fluorine-free additive, and is directly applied to a lithium battery. As an electrolyte, excellent electrochemical performance can be realized at a relatively high temperature, and meanwhile, the lithium ion battery has the advantage of ultrafast charging. The electrolyte has the outstanding characteristics of environment friendliness, low cost and excellent performance.

The invention discloses a fluoride-free strong-acid-free reverse flotation method for extracting a high-purity quartz sand flotation product from granite pegmatite, and belongs to the technical field of mineral flotation. The method comprises the following steps: carrying out graded crushing and ore grinding on granite pegmatite to obtain slurry to be treated; carrying out wet magnetic separation on the to-be-treated slurry to obtain ore pulp after magnetic separation and magnetic-containing minerals; the pH value of the ore pulp is not adjusted, reverse flotation is carried out in the presence of a quartz mixed inhibitor, and a feldspar product and a quartz product are obtained; the quartz mixed inhibitor is a combination of a component A and a component B, wherein the component A is selected from at least one of sodium metasilicate, sodium tripolyphosphate, sodium hexametaphosphate, carboxymethyl cellulose and salinized water glass; the component B is selected from at least one of guar gum, Arabic gum, sodium humate and citric acid. The method is free of fluorine and strong acid, green and efficient, and is a method for preparing high-purity quartz sand from pegmatite with high industrial application feasibility.

The application provides a fluorine-free transparent super-hydrophobic coating and a preparation method and application thereof, and belongs to the technical field of coating materials. A three-dimensional network structure formed by self-assembly of a bisamidate derivative (1,4-di[(3,4-dioctyloxyphenyl)-bisamidyl]benzene, BPH-8) is used as a template, tetraethyl orthosilicate (TEOS) is used as a silica precursor to be adsorbed on the surface of the template to perform sol-gel polymerization to form silica with high transparency, then BPH-8 is removed by calcination to obtain a fibrous silica transparent surface, then octyltrichlorosilane is used for hydrophobic modification of the silica surface to obtain a transparent super-hydrophobic coating. The fluorine-free transparent super-hydrophobic coating prepared by the application has a water contact angle of 162.7°, a rolling angle less than 3°, an average visible light transmittance of 84.8%, and good self-cleaning capacity, and has potential application value in the fields of building glass, vehicle window glass, rearview mirror, optical lens, solar photovoltaic and the like.

An exemplary method for forming a gate stack of a multigate device includes forming a gate dielectric over a channel layer and forming a gate electrode over the gate dielectric. Forming the gate electrode includes forming a work function layer over the gate dielectric and forming a cap over the work function layer. Forming the cap includes forming a metal nitride layer over the work function layer and forming a silicon-comprising layer over the metal nitride layer. Forming the gate electrode includes forming a fluorine-free tungsten layer over the silicon-comprising layer of the cap without breaking vacuum. Forming the fluorine-free tungsten layer over the silicon-comprising layer includes co-flowing a tungsten-comprising precursor (e.g., WCl5) and a hydrogen-comprising precursor (e.g., H2).

The invention relates to fluorine-free polyimide containing hydrophobic groups and a preparation method thereof, and belongs to the field of novel high-performance polyimide materials. The fluorine-free polyimide containing the hydrophobic group has a repeating unit structure shown in a general formula (I) and is obtained by polymerizing a fluorine-free diamine monomer containing the hydrophobic group and having a structure shown in a general formula (II) with specific diamine and dianhydride monomers. The fluorine-free polyimide containing the hydrophobic group has relatively low water absorption rate, has a low dielectric constant and a low loss factor at high frequency, has excellent solubility and thermal stability, can meet the performance requirements of a high-frequency and high-speed circuit on a substrate material, and has a wide application prospect. The material can be used as an excellent fluoride-free insulating base material in the fields of super-large-scale integrated circuits, photosensitive polyamideimide and the like.

The invention belongs to the technical field of nano materials and environment-friendly functional coatings, and discloses a preparation method and application of a lignin-based super-hydrophobic coating. The method comprises the steps that lignin is pretreated with ethylene carbonate to break steric hindrance and improve the grafting rate, then hexadecyl trimethoxy silane is added for grafting to form a hydrophobic chain, and surface energy is reduced; then adding silicon dioxide and N, N-dimethylformamide, carrying out ultrasonic dispersion to synergistically construct a micro-nano coarse structure, spraying the micro-nano coarse structure on a base material by using a spraying method, and putting the base material into a drying oven for curing, so as to obtain the lignin-based super-hydrophobic coating material. According to the method disclosed by the invention, a high-activity epoxy group is grafted on a lignin skeleton through ethylene carbonate pretreatment, so that steric hindrance in a three-dimensional space is broken, and dense anchor points are provided for a subsequent hydrophobic chain; then cocondensing with hexadecyl trimethoxy silane to form an alkyl-siloxane double network, and cooperating with nano silicon dioxide to construct micro-nano double roughness, so that a stable super-hydrophobic core under a fluorine-free condition is realized, and the technical route is simple and efficient.

The invention discloses a synthesis method of an organosilicon polyurethane fluoride-free waterproof agent, which belongs to the technical field of chemical preparation, and is prepared by adopting organosilicon as a main body to react with diisocyanate and acrylate monomers, carrying out chain extension by using a special double-bond chain extender and then adding various assistants. Organic silicon is a low-surface-energy substance and has a good water-repellent effect, a large number of siloxane bonds exist in the organic silicon, bond angles of the siloxane bonds are large, and methyl connected to silicon atoms can freely rotate. After use, the fabric has a good waterproof effect and a soft hand feeling; after the fluorine-free waterproof agent with the branched structure is used, a certain rough texture can be formed on the fabric, the surface roughness can influence the contact angle of liquid drops on the fabric, the nano lotus effect is realized, and the fabric has an excellent waterproof effect; the cationic waterborne polyurethane can be well combined with fabrics with negative charges, so that the waterproof agent is better in washability.

The invention discloses a fluoride-free flame-retardant polycarbonate compound, which comprises the following components in percentage by weight: 70-90% of polycarbonate, 10-20% of a flame retardant, 1-5% of an antioxidant and 1-5% of a lubricant. 3 to 15% of a polycarbonate-polysiloxane copolymer; 0.5-5% of a thermoplastic elastomer; 1-5% of inorganic mineral powder; 0.5 to 3% of silicon resin; 3-15% of a flame retardant; and 0.5-2% of other additives. The invention also discloses a preparation method of the fluoride-free flame-retardant polycarbonate compound. The beneficial effects comprise that under the condition that no PTFE anti-dripping agent is contained, the material has excellent mechanical performance and stable flame retardation performance, can satisfy PFAS prohibition, and is suitable for consumer electronics, industrial equipment, communication tools, traffic transportation, building materials, new energy and other application fields.

The invention discloses an environment-friendly fluoride-free bio-based paper protective coating easy to recycle as well as preparation and application thereof, and belongs to the technical field of paper-based packaging materials. The composition is mainly prepared by compounding a polyhydroxyalkanoate emulsion and a water-based acrylic polymer with a specific acid value and glass transition temperature. According to the scheme, a unique pH response switch is constructed, and the contradiction that an existing bio-based coating is high in brittleness and water resistance and alkaline repulping are difficult to consider at the same time is effectively solved on the premise of not depending on wax and additionally adding a cross-linking agent or a high-content surfactant. Compared with a traditional multi-component or high-energy-consumption recovery scheme on the market, the method has the advantages that excellent oil-proof and barrier properties and efficient fiber recovery under mild conditions can be realized only by a simple binary system, the formula complexity and the recovery cost are remarkably reduced, and the method has excellent environmental protection benefits and industrial application values.

The invention discloses preparation of a CS / BC / MBene composite aerogel material and application of the CS / BC / MBene composite aerogel material in photo-thermal water evaporation. A MoAlB precursor is etched through a fluoride-free hydrothermal method to prepare MoBTxMBene nanosheets, then the MoBTxMBene nanosheets, chitosan (CS) and bacterial cellulose (BC) are assembled through interaction of hydrogen bonds and the like, and the CS / BC / MBene composite aerogel with vertical pore channels is obtained through directional freeze drying. The aerogel has excellent photothermal conversion performance, mechanical strength and hydrophilicity, the maximum surface temperature of the composite aerogel under irradiation of one sunlight reaches 112.3 DEG C, the water evaporation rate of 5.06 kg.m <-2 >. H <-1 > and the photothermal conversion efficiency of 99.76% can be achieved, the composite aerogel is suitable for seawater desalination and sewage purification, the preparation method is environmentally friendly and simple, and the preparation method is suitable for industrial production. And the method has a wide industrial application prospect.

This porous membrane 1 contains a fluorine-free resin as a main component, and has a first surface 1a in which a plurality of holes are present and a second surface 1b on the opposite side from the first surface 1a. The arithmetic mean height Sa1 of the first surface 1a is 0.2 μm or greater. This method for producing a porous membrane 1 comprises, in the following order, a step for applying a solution that contains a fluorine-free resin and a solvent to a first surface 5a of a base material 5 to form a coating film, a step for immersing the coating film in water, a step for drying the coating film, and a step for detaching the coating film from the base material 5. The arithmetic mean height Sa3 of the first surface 5a of the base material 5 is 0.42 μm or greater.

The application relates to the technical field of finishing agents, and discloses a water-based fluorine-free low-temperature water-repellent finishing agent and a preparation method and application thereof. 2,2-dimethylol propionic acid alkyl ester and methyl phenyl dichlorosilane are reacted to obtain an alkyl ester siloxane copolymer, which is then stirred and dispersed with water and an emulsifier to obtain the water-based fluorine-free low-temperature water-repellent finishing agent. The main chain of the water-based fluorine-free low-temperature water-repellent finishing agent is a hydrophobic phenyl polysiloxane molecular chain, and the side chain contains hydrophobic ester groups and long carbon chains. After finishing of terylene fabric, water molecules can be prevented from contacting the terylene surface, and the hydrophobic and water-repellent performance of the terylene fabric is significantly improved. Moreover, a high water contact angle can be maintained after multiple washes.