93 results about "Precursor polymer" patented technology

The invention relates to a high-moisture-absorption chemical fiber filament composite hydrogel core-spun yarn and a preparation method thereof.The chemical fiber filament composite hydrogel core-spun yarn is prepared through the steps that hydrogel precursor polymers and chemical fiber filaments serve as raw materials, the chemical fiber filament composite core-spun yarn is prepared through an electrostatic spinning nano core-spun yarn technology, and then the chemical fiber filament composite hydrogel core-spun yarn and a cross-linking agent are subjected to a chemical cross-linking method. The chemical fiber filament composite hydrogel core-spun yarn prepared by the invention has excellent moisture absorption, water permeation and water conduction capabilities, can be used in the field of civil clothing such as work clothes and mountaineering wear, and provides a comfortable and healthy microenvironment for a human body.

The invention relates to the field of hydrogel preparation, and discloses anti-scale zwitter-ion hydrogel as well as a preparation method and application thereof. The method comprises the following steps: firstly, initiating an oxazine derivative monomer to polymerize through a double-end initiator to generate dihydroxyl polyoxazine; and then, removing a side chain of the polymer to obtain the dihydroxy polypropylene imine. Then, dihydroxy polypropylene imine is selected for further reaction to generate a zwitter-ion precursor polymer, and the zwitter-ion precursor polymer is hydrolyzed to obtain the polypropylene imine zwitter-ion derivative. And finally, converting hydroxyl groups at two ends, synthesizing a zwitterionic macromolecular cross-linking agent, and carrying out polymerization cross-linking in an aqueous solution to prepare the anti-scale zwitterionic hydrogel. The hydrogel is simple in formula, is completely composed of the zwitterionic cross-linking agent, has excellent anti-scaling performance such as protein adsorption resistance, bacterial adsorption resistance and cell adsorption resistance, and is suitable for biological materials, medical devices, implant materials and cell delivery materials.

The invention relates to a low-temperature amino cross-linked modified self-polymerized microporous polymer gas separation membrane, a preparation method and application, and belongs to the technical field of gas separation membranes, and the preparation method comprises the following steps: 1) synthesizing a cross-linked precursor polymer PIM-BM through a bromomethylation reaction; (2) preparing a membrane casting solution from the PIM-BM and a micromolecular amine cross-linking agent, casting, and volatilizing to form a membrane; and 3) carrying out heat treatment at 40-80 DEG C under a vacuum condition for 6-32 hours to form a cross-linked network structure, wherein the thickness of the film is 40-120 microns. According to the invention, a covalent cross-linked network is constructed through a low-temperature Hofmann alkylation reaction of an amine cross-linking agent so as to limit the movement of a polymer chain segment; the strong CO2 affinity of amido (-NH2) realizes dissolution selectivity compensation, and the diffusion selectivity synergistic effect of an inherent micropore channel of PIM-BM is combined, so that the tradeoff limitation of permeability-selectivity of a traditional gas separation membrane is broken through; the cross-linked structure can effectively improve the physical aging resistance of the PIM-BM film, and has good long-term continuous operation stability; the preparation process is low in low-temperature process energy consumption, easy to scale, suitable for the fields of coal-fired flue gas CO2 capture, natural gas purification and the like, and has industrial application potential.

The invention discloses a glass fiber fabric with an electric heating function and a preparation method, and belongs to the technical field of functional fabric materials. The method comprises the following steps: adding a graphene precursor polymer into an organic solvent, and carrying out stirring and ultrasonic treatment to obtain a graphene precursor polymer solution; the preparation method comprises the following steps: dipping and drying a glass fiber fabric in a graphene precursor polymer solution, coating the surface of the glass fiber fabric with a graphene precursor polymer layer, repeatedly dipping and drying for multiple times, and curing to obtain the glass fiber fabric with the graphene precursor polymer layer; and pasting the glass fiber fabric with the graphene precursor polymer layer on a flat plate material, performing laser direct writing in an air environment according to a preset pattern path, and synchronously performing graphene treatment and patterning treatment on the graphene precursor polymer to prepare the glass fiber fabric with the electric heating function. The preparation process is simple and is compatible with construction of the conductive graphene layer with glass fiber structural characteristics, and the LIG technology can be used for in-situ generation of graphene on the surface of the glass fiber fabric, so that a flexible glass fiber fabric material with an electric heating function is obtained.

The invention relates to the field of advanced ceramic materials, in particular to a ceramic matrix composite (CMC) and a preparation method thereof. The technical problems that a traditional CMC preparation technology is long in period, poor in structural uniformity and insufficient in toughness are solved. According to the method, surface-modified aluminum oxide ceramic microspheres are used as reinforcements, the surfaces of the microspheres are sequentially modified with hexagonal boron nitride nanosheets and a metal nickel catalyst, the microspheres, silicon carbide nanoparticles and a polycarbosilane precursor are mixed to form slurry, and a complex component is formed through multi-material additive manufacturing. A green body is prepared by using a 3D printing technology combining photocuring and material extrusion; carrying out ultraviolet curing on the green body, and carrying out staged heat treatment in an inert atmosphere, so that the precursor polymer is subjected to cross-linking curing, and meanwhile, carbon nanowires grow through in-situ catalysis; and finally, sintering under a pressurizing condition to realize matrix densification. The preparation period is greatly shortened, and the obtained composite material is uniform in structure, compact in matrix and excellent in mechanical property.

The application discloses a kind of multi-element ultra-high temperature nanocomposite ceramic matrix composites and preparation method thereof, the multi-element ultra-high temperature nanocomposite ceramic matrix composites are composed of multi-element ultra-high temperature nanocomposite ceramic and porous fiber body, wherein multi-element ultra-high temperature nanocomposite ceramic is composed of oxygen-free silicon-based ceramic and multi-element transition metal carbonitride uniformly distributed therein, and the preparation method is: at least two metal element complexes are reacted with silicon-based polymer to obtain single-source precursor polymer;Then porous fiber body is placed in single-source precursor polymer solution for multiple times of impregnation pyrolysis, and the composite material provided by the application has a nanocomposite structure, an ultra-high temperature ceramic multi-element single-phase solid solution, the type, content and ratio of metal elements can be adjusted, the ultra-high temperature ceramic in the matrix is uniformly distributed and has a nanoscale grain size, and the method can avoid damage to the fiber during preparation, thereby achieving simultaneous improvement of the mechanical properties and oxidation ablation resistance of the composite material.

Anion exchange polymers comprise a plurality of repeating units of formula (I). The polymer may be synthesized from a super acid catalyzed polyhydroxyalkylation reaction of monomers Ar1′, Ar2′, and X1′ to form a neutral precursor polymer followed by a Menshutkin reaction to convert the neutral precursor polymer to the anion exchange polymer.Anion exchange membranes and membrane electrode assemblies incorporating the anion exchange polymers are also described.

The application relates to a polyaryletherketone resin, a preparation method thereof and application thereof in functional membranes, and belongs to the technical field of functional polymer materials. First, an aromatic monomer 4,4'-((9-(6-(4-tritylphenoxy)hexyl)-9H-carbazole-3,6-diyl)bis(diphenylmethylene))diphenol (monomer 1) containing a dense benzene ring and a flexible side group is prepared; then, through a nucleophilic substitution reaction catalyzed by K2CO3, a polyaryletherketone precursor polymer containing a Schiff base is prepared by taking 1,1-bis(4-fluorophenyl)-N-phenylmethane imine, 4,4'-dihydroxydiphenyl ketone and the monomer 1 as raw materials; after the polyaryletherketone precursor polymer is sulfonated by concentrated sulfuric acid, a polyaryletherketone resin containing sulfonic acid groups is prepared; after the polyaryletherketone resin is dissolved in dichloroacetic acid, a polyaryletherketone ion exchange functional membrane is prepared by adopting a flow extension method, and the membrane has the advantages of excellent oxidation resistance stability, good dimensional stability and solution processing property and the like.

This invention discloses a method for preparing a self-healing, antibacterial dynamic hydrogel and its coating application. The method includes: 1. Reacting konjac glucomannan with sodium periodate to achieve aldehyde functionalization, and mixing it with sodium alginate powder to prepare a precursor polymer solution A; 2. Mixing an acylhydrazide or hydroxylamine small molecule crosslinking agent with an aminoglycoside drug to prepare an amino crosslinking agent solution B, and preparing a calcium salt ionic crosslinking agent solution C; 3. Mixing the three solutions and allowing them to stand to obtain a hydrogel. The application involves coating a hydrogel mixture solution onto a biodegradable metal surface after preparing a polyethyleneimine auxiliary layer and then gelling it. This invention utilizes aldehyde-functionalized oxidized konjac glucomannan and two crosslinking agents to form acylhydrazone, oxime, and imine bond networks, endowing the hydrogel with self-healing, self-responsive, and long-term antibacterial properties. The hydrogel of this invention improves the biocompatibility, antibacterial properties, and stability of biodegradable metal substrates, making it suitable for biodegradable implantation applications.

Methods for etching nanostructures in a substrate include depositing a patterned block copolymer on the substrate, the patterned block copolymer including first and second polymer block domains, applying a precursor to the patterned block copolymer to generate an infiltrated block copolymer, the precursor infiltrating into the first polymer block domain and generating a material in the first polymer block domain, applying a removal agent to the infiltrated block copolymer to generate a patterned material, the removal agent removing the first and second polymer block domains from the substrate, and etching the substrate, the patterned material on the substrate masking the substrate to pattern the etching. The etching may be performed under conditions to produce nanostructures in the substrate.

A polymer composition including particles having a ratio of an average particle diameter D90 to an average particle diameter D50 of 2.3 or less, and a polymer having a dielectric loss tangent of 0.01 or less, and applications thereof.

The invention discloses a grafted sulfonated polymer membrane containing a spiro structure, a preparation method of the grafted sulfonated polymer membrane and application of the grafted sulfonated polymer membrane in an electrochemical energy storage device, and belongs to the technical field of polymer separation membranes. The membrane material comprises a polymer prepared by a polymerization reaction, and monomers for the polymerization reaction comprise an aromatic monomer with a spiro indane structure and a monomer containing an imidazole group; the polymer is characterized in that in a repetitive unit of the polymer, a side chain containing a sulfonic group is grafted on a nitrogen atom of an imidazole group. The preparation method comprises the following steps: carrying out polymerization reaction on the two monomers to obtain a precursor polymer; then, reacting the precursor polymer with a sulfonating agent to realize grafting of a sulfonic group side chain on an imidazole group nitrogen atom; and finally, preparing the membrane through a solution tape casting method. According to the preparation method, a sulfonic side chain is introduced into a spiro polymer skeleton with high chemical stability in a grafting manner, so that an efficient ion conduction channel is constructed, meanwhile, the structural stability of the membrane material is kept, and the prepared membrane material shows excellent comprehensive performance in application of alkaline aqueous organic flow batteries and the like.

The invention discloses polyaryletherketone resin, a preparation method and application of the polyaryletherketone resin in a functional film, and belongs to the technical field of functional polymer materials. The preparation method comprises the following steps: firstly, preparing an aromatic monomer 4, 4 '-((9-(6-(4-triphenylmethyl phenoxy) hexyl)-9H-carbazole-3, 6-diyl) bis (diphenylmethylene)) diphenol (monomer 1) of a dense benzene ring containing a flexible side group, then taking 1, 1-bis (4-fluorophenyl)-N-phenylmethane imine, 4, 4'-dihydroxydiphenylketone and the monomer 1 as raw materials, and carrying out a nucleophilic substitution reaction catalyzed by K2CO3, so as to obtain the high-molecular polymer. A polyaryletherketone precursor polymer containing Schiff base is prepared; a polyaryletherketone precursor polymer is sulfonated with concentrated sulfuric acid, polyaryletherketone resin containing sulfonic acid groups is prepared, the polyaryletherketone resin is dissolved in dichloroacetic acid, a film is laid through a casting method, the polyaryletherketone ion exchange functional membrane is prepared, and the membrane has the advantages of being excellent in anti-oxidation stability, good in size stability, good in solution processability and the like.

The embodiment of the invention relates to the field of batteries, and provides a battery monomer and a preparation method thereof, a battery device, a power utilization device and an energy storage device. The preparation method of the battery monomer comprises a process of preparing a composite diaphragm and a process of assembling the composite diaphragm, a positive electrode plate and a negative electrode plate, and the composite diaphragm comprises a first membrane layer, a porous membrane layer and a second membrane layer which are stacked, the preparation process of the composite diaphragm comprises the following steps: preparing sol containing a carbon precursor polymer, a pore inducer and a cross-linking agent into a fiber membrane; performing heat treatment on the fiber membrane to obtain a porous membrane layer; and compounding the porous membrane layer and the membrane layer to obtain the composite diaphragm. According to the embodiment of the invention, the porous carbon nanofiber membrane is introduced to one side of the base membrane, so that the purpose of promoting reversibility of lithium precipitation is achieved, and the technical effects of effectively controlling and reducing formation of lithium dendrites in the later period of battery circulation and avoiding diving and potential short-circuit risks of the performance of a battery cell are achieved.

The invention relates to a main chain type polyaryl piperidine polymer as well as a preparation method and application thereof, and the preparation method comprises the following steps: dissolving a linear structure phenyl monomer, a strong bond energy linear structure phenyl monomer, 1, 2-diphenylethane and N-methyl-4-piperidone to obtain a precursor polymer solution; dropwise adding trifluoroacetic acid and trifluoromethanesulfonic acid to obtain a main chain type polyarene piperidine polymer precursor; and dissolving the polyaromatic piperidine, adding methyl iodide and potassium carbonate, reacting to obtain a quaternized main chain type polyaromatic piperidine polymer, and carrying out membrane treatment and alkali treatment processes to obtain the anion exchange membrane. By introducing the high-rigidity hydrophobic linear monomer with strong bond energy, the problem of mutual entanglement between linear main chains of a traditional polymer is solved, larger free volume and steric hindrance are provided, and high ionic conductivity and high alkali stability of the anion exchange membrane are realized; therefore, the water electrolysis performance of the anion exchange membrane electrolytic tank is further improved, and high-performance and high-stability electrolytic tank application is realized.

A method of making spherical gettering particles for an environmental barrier coating according to an exemplary embodiment of this disclosure, among other possible things includes spraying liquid preceramic polymer into a chamber via a nozzle to form liquid droplets, curing the liquid droplets to form spherical particles in the chamber, and converting the spherical particles to spherical ceramic gettering particles in a fluidized bed. A method of making spherical gettering particles for an environmental barrier coating and an article are also disclosed.

The present invention relates to the field of the synthesis of polymers. Disclosed are a polypropyleneimine derivative, and a preparation method therefor and a use thereof. The method comprises: firstly, initiating polymerization of an oxazine derivative monomer by means of an initiator, then removing a side chain from a polymer to obtain polypropyleneimine, selecting the polypropyleneimine for a further reaction to obtain a zwitterionic precursor polymer, and finally, hydrolyzing the precursor polymer to obtain a polypropyleneimine zwitterionic derivative. The polypropyleneimine zwitterionic derivative prepared in the present application contains a zwitterionic group in each or some of repeating units. The zwitterionic group endows the polymer with good hydrophilicity and anti-protein non-specific adsorption properties. The polymer has no immunogenicity, will not be recognized by the immune system and captured by immune cells, can be used as a drug carrier and a gene vehicle, and has good blood circulation stability. Alternatively, the polymer is used as a biological material, a medical device, an implantable material, or a cell delivery material and has good anticoagulation, anti-rejection, and biofilm properties.

A method of making a flexible package made of polymeric film is provided. The method comprises the steps of: a) obtaining post-industrial recycled material from post-industrial recycling of precursor polymeric film formed of precursor polymeric material which is substantially the same as the virgin polymeric material of step c), b) providing at least 30 weight-% post-industrial recycled material obtained in step a) based on the overall weight of the polymeric film, c) providing up to 70 weight-% of virgin polymeric material based on the total weight of the polymeric film, and d) jointly melting the virgin polymeric material and the post-industrial recycled material. The method comprises the steps of: e) extruding the molten polymeric material and molten post-industrial recycled material to form a polymeric film, f) providing print on one or both surfaces of the polymeric film, and g) converting the polymeric film into the flexible package.

The anion exchange membranes exhibit enhanced chemical stability and ion conductivity when compared with traditional styrene-based alkaline anion exchange membranes. A copolymer backbone is polymerized from a reaction medium that includes a diphenylalkylene and an alkadiene. The copolymer includes a plurality of pendant phenyl groups. The diphenyl groups on the polymer backbone are functionalized with one or more haloalkylated precursor substrates. The terminal halide from the precursor substrate can then be substituted with a desired ionic group. The diphenylethylene-based alkaline anion exchange membranes lack the α-hydrogens sharing tertiary carbons with phenyl groups from polystyrene or styrene-based precursor polymers, resulting in higher chemical stability. The ionic groups are also apart from each other by about 3 to 6 carbons in the polymer backbone, enhancing ion conductivity. These membrane are advantageous for use in fuel cells, electrolyzers employing hydrogen, ion separations, etc.

The invention discloses a carbon source doped structured SiOC ceramic as well as a preparation method and application thereof, and relates to the technical field of ceramics. The method comprises the following steps: preparing a SiOC ceramic precursor solution; uniformly dispersing a carbon source material in the SiOC ceramic precursor solution to obtain a doped solution; obtaining a SiOC precursor polymer with a negative Poisson's ratio structure from the doped solution by adopting a 3D printing technology; sequentially carrying out curing, cracking and heat treatment on the SiOC precursor polymer to obtain the carbon source doped structured SiOC ceramic, the conductivity of the SiOC ceramic is regulated and controlled by changing the doped carbon source material, the conductivity with the semiconductor level is obtained, the high piezoresistive coefficient is obtained, and therefore the pressure change can be well monitored. The performance of the SiOC ceramic material can be effectively improved by regulating and controlling the doping concentration and the sintering process.

Provided is a hydrogel precursor polymer derived from a poly (asparagine) (PAsPm) comprising cleavable and crosslinkable moieties attached to a pendant carboxylic acid group of the poly (asparagine); and a hydrophilic moiety also attached to a pendant carboxylic acid group, such as an ether-containing moiety obtained by ring opening a polysuccinimide with 2-(2-aminoethoxy) ethanol.

The invention discloses a stretchable elastic carbon nanofiber membrane material and a preparation method thereof. The preparation method comprises the following steps: respectively dissolving polystyrene and a carbon precursor polymer to prepare a spinning solution, spinning according to a certain combination sequence to obtain a multi-layer carbon precursor nanofiber membrane, and inducing the construction of a micro-buckling structure of the carbon precursor nanofiber membrane by utilizing a thermal shrinkage effect of a polystyrene layer to obtain the multi-layer carbon precursor nanofiber membrane. Polystyrene is dissolved and removed through ethyl acetate, a nanofiber membrane only retaining a pure carbon precursor is obtained, and finally the stretchable elastic carbon nanofiber membrane is obtained through pre-oxidation and carbonization. The elastic carbon nanofiber membrane prepared by the invention has excellent tensile resilience, high conductivity and high specific surface area, and can be applied to the application fields of national defense and military industry, energy environmental protection, aerospace, flexible electronics and the like.

The disclosure relates to a metalated-sulfonated styrenic block copolymer (SO3−M+-SBC) composition. The composition is obtained by epoxidation of SBC precursor followed by alcoholysis of epoxidized SBC using Grignard reagent, and then lithiation and sulfonation (in-situ). The precursor polymer can have any of a sequential diblock, triblock or a coupled structure, which can be extended to a tetrablock, a pentablock copolymer, with at least one of the blocks metalated-sulfonated. The SO3−M+-SBCs are suitable for use as electrolytes in energy storage devices. The SO3−M+-SBC is converted to sulfonic acid styrenic block copolymer (SO3−H-SBC) upon acidification. The SO3−H-SBCs are suitable for use as cation exchange membranes and numerous ion and moisture transport applications.

A method of forming a crosslinked film comprising crosslinking a precursor film disposed on a surface wherein the precursor film comprises a precursor polymer and a crosslinking agent; and either: the precursor polymer is substituted with one or more carbonyl groups and the crosslinking agent comprises a plurality of amine groups, or the precursor polymer is substituted with one or more amine groups and the crosslinking agent comprises a plurality of carbonyl groups. The crosslinked film may be used as a high thermal conductivity underfill in a 3D-chip.

A method of forming a polymer film includes providing a substrate and a superstrate, and providing a precursor polymer solution. The precursor polymer solution is flowed by capillary action between the substrate and the superstrate. The precursor polymer solution is cured to form the polymer film. The method can be referred to as capillary crawl film formation (CCFF), and can be implemented in the simple, low-cost and / or highly scalable manufacture of thin polymer films.

The invention relates to the technical field of temperature detection and strain testing, and discloses a wireless passive / temperature strain two-parameter sensing element based on a precursor polymer ferroelectric composite ceramic film and a preparation method of the wireless passive / temperature strain two-parameter sensing element. The composite dielectric coating comprises a substrate, an insulating layer and a composite dielectric layer from bottom to top, and the composite dielectric layer is prepared by mixing a precursor ceramic polymer with ferroelectric ceramic powder through high-temperature pyrolysis; the temperature sensitive structure and the strain sensitive structure are both comb tooth structures and are matched with the internal inductor and the external inductor to form an independent LC resonant circuit, the dielectric constant or the polar plate distance is changed through the environment temperature and deformation, the LC resonant frequency is changed, the temperature and the strain are effectively measured, and the working state of a measured structural part can be visually reflected.

The invention discloses transition metal element doped metamaterial structure SiOC ceramic as well as a preparation method and application thereof, and relates to the technical field of ceramic. The method comprises the following steps: preparing a SiOC ceramic precursor solution; uniformly dispersing a transition metal element compound in the SiOC ceramic precursor solution to obtain a doped solution; the SiOC precursor polymer is sequentially subjected to room-temperature stirring, curing, heat treatment, ball milling, screening, tabletting and pyrolysis operation, and the transition metal element doped structured SiOC ceramic is obtained. The conductivity of the SiOC ceramic is regulated and controlled by changing the concentration of the doped transition metal compound, the conductivity with the semiconductor level is obtained, the high piezoresistive coefficient is obtained, and therefore the pressure change can be well monitored.

The invention discloses an ultrahigh-temperature ceramic film with improved conductivity through grafting modification and a preparation method of the ultrahigh-temperature ceramic film, and relates to the technical field of ultrahigh-temperature ceramic preparation. The method comprises the following steps: stirring and dispersing a SiHfBCN ceramic precursor polymer, MWCNTs-COOH and triton X-100 in methylbenzene, then adding 2-benzyl-2-dimethylamino-4 '-morpholinyl phenylbutanone, and stirring and dissolving to prepare a mixed solution; spin-coating on the surface of a pretreated silicon wafer to prepare a polymer film; and carrying out ultraviolet irradiation, pyrolyzing and cooling to prepare the ultrahigh-temperature ceramic film with improved conductivity through grafting modification. The room temperature resistivity of the modified SiHfBCN ceramic thin film can be reduced by about 70% to the maximum, and the problem that an existing ceramic thin film is poor in conductivity is solved.

The invention discloses a positive photosensitive polybenzoxazole resin composition, a preparation method and an application thereof. The composition comprises the following components in parts by weight: 100 parts by weight of an aromatic silicon-containing polybenzoxazole precursor polymer, 1-50 parts by weight of a photosensitizer, 80-800 parts by weight of a solvent and an additive. The positive photosensitive polybenzoxazole resin composition is applied through coating, pre-baking, exposure, development and thermal curing. The aromatic silicon-containing polybenzoxazole precursor polymer is obtained by polycondensing an aromatic silicon-containing diacid and an acyl halide thereof with a hydroxyl-containing diamine by a known method. The introduction of the aromatic silicon-containing structure can improve the flexibility of the polymer molecular chain and reduce the rigidity. The silicon-oxygen structure has good affinity for substrates such as silicon, glass and ITO, thereby improving the bonding performance between the polybenzoxazole film and the substrate, enabling the polybenzoxazole film to withstand the high temperature of the thermal cyclization process and complex operating environments.

The present application belongs to the technical field of adsorbent materials, and particularly relates to a kind of amidoxime-based polymer adsorbent material and its preparation method and application.The present application uses tannic acid and tetrafluoro-p-xylylene dinitrile as raw materials, forms precursor polymer with three-dimensional network cross-linking structure through cross-linking reaction, introduces amidoxime group through amidoxime reaction, and obtains amidoxime-based polymer adsorbent material.The present application realizes high selective coordination capture of gold ions by introducing amidoxime group;in-situ reduction of gold ions is realized by using tannic acid phenolic hydroxyl group;high stability of the material under harsh environment is endowed by using fluorine-containing rigid cross-linking skeleton.The material can directly complete selective adsorption, in-situ reduction and elemental gold recovery of gold from complex electronic waste leaching liquor in one step, omits elution and additional reduction steps in traditional process, and has the advantages of simple process, high efficiency, good selectivity, low cost, green environmental protection and the like.