198results about How to "Reduce crystallinity" patented technology

The invention provides a method for preparing high-purity and fine-particle-size lithium sulfide based on carbon thermal reduction. The method comprises the following steps: weighing lithium sulfate monohydrate, an insoluble inorganic carbon source and cysteine in a set proportion to form a raw material mixture; mixing the raw material mixture with water according to a set solid-to-liquid ratio, performing ultrasonic dispersion to obtain homogeneous dispersion liquid, and enabling the dispersion liquid to pass through a nitrogen circulating spray dryer to obtain uniform and dry precursor powder; in a vacuum environment, carrying out segmented calcination to obtain a crude product lithium sulfide; and in a dry and anhydrous environment, washing the crude product lithium sulfide for multiple times by using absolute ethyl alcohol according to a set liquid-solid ratio to obtain an alcoholic solution containing lithium sulfide, and then obtaining lithium sulfide fine powder through a nitrogen circulating spray dryer. The invention solves the problems of side reaction, low purity, large product particles, uncontrollable particle size and the like of lithium sulfide prepared by a carbon thermal reduction method in the prior art.

The invention relates to a polymer-based composite solid electrolyte, a preparation method and a sodium solid-state battery, and belongs to the technical field of solid-state batteries. The polymer-based composite solid electrolyte is prepared from the following components in parts by mass: 8 to 12 parts of alkene polymer, 4 to 8 parts of sodium salt and 1 to 8 parts of filler, and the filler is nitrided nano TiO2. The polymer-based composite solid electrolyte can be prepared in a simple and efficient mode, the ionic conductivity is high, the electrochemical stability window is wide, the ionic conductivity reaches 0.3-1.2 mS / cm, and the electrochemical stability window reaches 4.3-5.5 V; and meanwhile, the formation of good SEI can be promoted in the sodium solid-state battery, and the interface stability between the electrolyte and the electrode is improved.

The invention relates to the technical field of synthetic fibers, in particular to a high-elasticity textile fiber and a preparation process thereof. The high-elasticity textile fiber is prepared from the polyurethane-polyamide elastomer and the modified diatomite master batch through melt spinning, drafting and winding. According to the invention, hydroxyl-terminated polydimethylsiloxane is used as polyol, and the molar ratio of the polyurethane prepolymer to the polyamide prepolymer is controlled, so that the prepared polyamide-polyurethane elastomer slice has good heat resistance; the molar ratio of isocyanate to polyol and the molar mass ratio of caprolactam to adipic acid are controlled, so that the prepared textile fiber is excellent in mechanical property; 2, 2-dimethylolpropionic acid is used for a chain extension reaction, the molar ratio is controlled, the moisture regain of the prepared textile fiber is 8.58%, and the moisture absorption is high; the diatomite is modified by the quaternary ammonium salt compound, and the addition proportion is adjusted, so that the prepared spinning fiber has good antibacterial performance.

The invention discloses a preparation method and an application of an S and N co-doped small-nano-size high-entropy intermetallic compound. 2, 2 '-bithiophene is simultaneously used as a metal ligand and a sulfur source to be applied to synthesis of the high-entropy intermetallic compound, and sulfur atoms in the substance can form a complex with metal ions, so that a metal precursor can be uniformly and firmly distributed on the surface of a commercial carbon carrier, and formation of the high-entropy intermetallic compound in the subsequent annealing process is facilitated; the S and N co-doped high-entropy alloy intermetallic compound catalyst synthesized by the invention has excellent electrochemical performance in a fuel cell, and particularly has remarkable performance in the aspect of stability; wherein the mass activity of the S and N co-doped high-entropy alloy intermetallic compound PtCuNiCoFe / C-SN (PCNCF-SN) catalyst under the condition of 0.9 V (vs.RHE) reaches 2.7 A * mg <-1 > Pt, which is more than 12.3 times of that of commercial Pt / C; and in the aspect of stability, the mass activity can still be kept at 65% or above after 100000 circles of accelerated durability.

The invention relates to hydrolysis-resistant polyester polyol with high bio-based content, polyurethane resin for a synthetic leather surface layer and a preparation method of the hydrolysis-resistant polyester polyol. The hydrolysis-resistant polyester polyol with high bio-based content comprises the following raw materials: bio-based dihydric alcohol, bio-based dibasic acid, an antioxidant and a catalyst. In the hydrolysis-resistant polyester polyol with high bio-based content, provided by the invention, the bio-based dihydric alcohol not only comprises micromolecular bio-based 1, 3-propylene glycol, but also comprises low-carbon environment-friendly long-chain polypropylene carbonate dihydric alcohol with molecular weight of 1000, so that the crystallinity and hardness of the bio-based polyester polyol are reduced; the hydrolysis resistance and flexibility of the bio-based polyester polyol are improved, the hydrolysis resistance of polyurethane resin for a synthetic leather surface layer prepared from the hydrolysis-resistant polyester polyol with the high bio-based content is synchronously improved, and the stable dispersion performance of pigment is good.

The present invention relates to a method for preparing a attapulgite / molecular sieve composite adsorbent, comprising the following steps: (1) using NaX molecular sieve powder as a raw material, adding purified attapulgite, grinding, adding an aluminum source for crystallization, filtering, washing to a pH of 7 to 8, and drying to obtain a attapulgite / molecular sieve composite adsorbent precursor; (2) exchanging the composite adsorbent precursor obtained in step (1) with metal cations, and then filtering, washing, drying, molding, and activating to obtain the composite adsorbent. The composite adsorbent has a simple preparation method, a large adsorption capacity, and good selectivity. It can effectively adsorb and separate liquid mixtures, and has broad application prospects in selectively adsorbing and separating p-xylene from C8 aromatic isomers. The present invention also relates to a attapulgite / molecular sieve composite adsorbent and its application in adsorbing and separating p-xylene in mixed xylene.

The invention provides a solid electrolyte for a lithium battery and a preparation method and application thereof, and belongs to the technical field of solid electrolytes.The solid electrolyte is prepared from, by mass, 40-75 parts of lithium salt, 10-30 parts of cross-linking agent, 5-25 parts of nanoscale silicon borate glass fiber and 1-10 parts of photoinitiator. The lithium salt, the cross-linking agent, the nanoscale silicon borate glass fiber and the photoinitiator are adopted as raw materials, a polymer component formed after ultraviolet curing has high mechanical performance, a stable electrolyte-electrode interface can be formed, growth of lithium dendrites can be effectively inhibited, the risk of short circuit of the battery is reduced, and the service life of the battery is prolonged. Therefore, the overall safety of the battery is improved, and the service life of the battery is prolonged. As an inorganic filler, the nanoscale silicon borate glass fiber is beneficial to reducing the crystallinity of a polymer component and increasing an amorphous phase region, so that rapid migration of lithium ions is facilitated, and the ionic conductivity and coulombic efficiency of the battery are improved.

The preparation method comprises the following steps: preparing PET non-woven fabric raw paper, preparing a nano-zinc oxide particle dispersion liquid, dipping the PET non-woven fabric raw paper in a solution, carrying out heat treatment to form a functional PET non-woven fabric, preparing a functional alkenyl ionic liquid, carrying out heat treatment to form a PET non-woven fabric, and carrying out heat treatment to form the PET reinforced bi-crosslinked polyionic liquid composite solid electrolyte. Adding a cross-linking agent, a lithium salt, a plasticizer and a photoinitiator to prepare an electrolyte precursor solution; the functional PET non-woven fabric is placed in the electrolyte precursor solution, standing and dipping are carried out under the vacuum condition, then thermal polymerization and photopolymerization are carried out, and the solid electrolyte is prepared and applied to the solid polymer lithium ion battery; the zinc oxide particles are compounded into the PET non-woven fabric to form the non-woven fabric which is thin in thickness, high in tensile strength and appropriate in porosity, and the non-woven fabric is cross-linked with the functionalized alkenyl ionic liquid and the electrolyte precursor solution step by step, so that the ionic conductivity, the electrochemical window and the thermal stability of the solid electrolyte and the safety performance of the battery in use are improved.

The invention relates to a polyester flash non-woven fabric and a preparation method thereof, and belongs to the technical field of non-woven fabrics. The preparation method comprises the following steps: adding polyester particles, polyethylene particles, zinc oxide, a compatilizer and an antioxidant into an extruder, extruding to obtain modified particles, and grinding the modified particles to obtain superfine powder; adding the superfine powder and a solvent into a high-pressure kettle, and stirring and dissolving under heating and pressurizing conditions to form a uniform polyester solution; cooling the uniform polyester solution to a spinning temperature, and introducing supercritical carbon dioxide gas to form a uniform flash spinning solution; spinning pressure is controlled for spinning, a mesh is obtained through electrostatic filament splitting and lapping and hot air treatment of a residual solvent, the mesh is subjected to three-stage infrared preheating, and finally, the polyester flash non-woven fabric is obtained through hot pressing. The strength of the obtained non-woven fabric is superior to that of traditional polyethylene non-woven fabric, and the obtained non-woven fabric is good in breathability, good in antibacterial performance and excellent in comprehensive

The invention relates to a preparation method of a supercritical foaming polylactic acid material, and belongs to the technical field of foaming polylactic acid.The preparation method comprises the steps that a polycaprolactone-polylactic acid copolymer and a chain extender YMX-06 serve as modifiers to prepare modified polylactic acid granules, so that the strength and ductility of polylactic acid melt are improved, and the foaming temperature and pressure are reduced; in a supercritical state, carbon dioxide has high diffusivity and low viscosity, so that the carbon dioxide can uniformly permeate into a modified polylactic acid granule matrix to form tiny bubbles, the bubbles are not easy to collapse in a bubble growth stage, the pore size distribution uniformity is good, the sizes of the bubbles are small, and the walls are thin; compared with pure polylactic acid, the obtained modified foaming material is higher in foaming ratio, lighter, better in heat retaining property and high in mechanical strength. The ultralight, environment-friendly and foaming agent residue-free degradable foam material can be used in the fields of building insulation, cold-chain transportation, anti-collision packaging and the like.

The invention belongs to the technical field of catalyst preparation, and discloses a double-metal cyanide complex catalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: dispersing a metal precursor in a first solvent to obtain a solution A; dispersing metal cyanide in a second solvent to obtain a solution B; immersing a high-shear mixer into the solution A, dropwise adding the solution B into the solution A for reaction, then adding the solution C for continuous reaction, and filtering to remove filtrate to obtain a precipitate; and carrying out constant-temperature slurrying on the precipitate by using the solution D, and finally carrying out solid-liquid separation to obtain a solid product. At least one of the solution A, the solution B, the solution C or the solution D contains a ligand compound. The double-metal cyanide complex catalyst prepared by the method has the characteristics of short catalytic induction time, narrow molecular weight distribution of prepared polyether polyol and the like when being used for ring-opening polymerization of epoxy compounds.

The invention provides a modified copolyester film as well as a preparation method and application thereof. The modified copolyester film is prepared from the following raw materials: binary acid, dihydric alcohol and a catalyst, the binary acid comprises 2, 5-furandicarboxylic acid and other binary acid; the dihydric alcohol comprises neopentyl glycol and other dihydric alcohol. 2, 5-furandicarboxylic acid is introduced into a modified copolyester molecular chain, so that the polarity and hydrophilicity of polyester are improved, the interfacial interaction force between the polyester surface and a copper foil is increased, and the adhesive force between the polyester surface and the copper foil is improved; neopentyl glycol is introduced into a modified copolyester molecular chain, so that the regularity of polyester is further destroyed, the crystallinity and the melting point of polyester are reduced, the film is easier to soften or partially melt when in contact with a copper foil, the contact area between the film and the copper foil is increased, mutual diffusion between the film and the copper foil is increased, and the bonding strength between the film and the copper foil is improved.

The invention provides a polymer elastomer and a preparation method and application thereof, and relates to the field of self-powered strain sensors. The preparation method of the polymer elastomer provided by the invention comprises the following steps: mixing cellulose and a deep eutectic solvent, and carrying out hydrogen bond bonding to obtain a hydrogen bond network system; mixing the hydrogen bond network system with an acrylic anhydride compound, and carrying out esterification reaction to obtain a modified cellulose system; and mixing the modified cellulose system, an acrylic monomer and an initiator, and carrying out in-situ free radical polymerization to obtain the polymer elastomer, the hydrogen bond donor of the deep-eutectic solvent is ethylene glycol and / or glycerol, and the hydrogen bond acceptor is choline chloride. Elastomer polymerization is carried out in an anhydrous system, the eutectic solvent is grafted to the surface of cellulose, based on the Seebeck principle, temperature difference can be generated at the two ends of the material through body temperature, potential difference is finally formed at the cold end and the hot end, and low-temperature waste heat is recycled and converted into electric energy.

The invention discloses self-repairing UHPC (Ultra High Performance Concrete). The self-repairing UHPC comprises a UHPC matrix, magnetic induction microcapsules and a hydrophilic modified heat-shrinkable fiber net, wherein the magnetic induction microcapsules and the hydrophilic modified heat-shrinkable fiber net are distributed in the UHPC matrix; wherein the magnetic induction self-repairing microcapsule comprises a core material and a wall material, the core material adopts isophorone diisocyanate, and the wall material comprises melamine formaldehyde resin and a rubidium magnet; the hydrophilic modified thermal shrinkage fiber net is a woven net formed by hydrophilic modified polypropylene fibers and hydrophilic modified nylon fibers. The hydrophilic modified heat-shrinkable fiber net and the electromagnetic induction self-repairing microcapsule are simultaneously introduced into a UHPC concrete matrix, a synergistic effect is exerted to repair cracks, the overall performance of the concrete can be effectively improved, the toughness, crack resistance, impact resistance and the like of the obtained concrete are remarkably improved, and the service life of the concrete is prolonged. And meanwhile, on-demand release of the repairing material in the self-repairing microcapsule can be realized, the utilization efficiency of the repairing agent is improved, and the applicability is wide.

The invention relates to a pre-fermentation method for improving biogas production of straws and a biogas production fermentation system. The pre-fermentation method comprises the following steps: S1, preparing a mixed microbial agent to be fermented; the mixed microbial agent is prepared by inoculating the following zymophyte in parts by weight into a fermentation culture medium according to the total inoculation amount of 3-10% (v / v): 5-50 parts of bacillus subtilis, 10-20 parts of white-rot fungi, 5-10 parts of aspergillus oryzae, 5-10 parts of trametes versicolor and 5-10 parts of trichoderma viride; s2, uniformly mixing the mixed microbial agent with the micro-nano bubble water, and fermenting to form an enhanced hydrolysis bacterium solution containing a microbial agent fermentation solution and an enzyme solution; s3, spraying enhanced hydrolysis bacteria liquid onto the straws for enhanced hydrolysis so as to complete pretreatment before fermentation and biogas production; wherein the volume of the reinforced hydrolytic bacteria liquid required by each kg of straw is 3-5L. Compared with the prior art, the mixed microbial agent and the micro-nano bubble water are used for carrying out cooperative treatment on the straw, so that the gas production efficiency and the methane production amount of the straw can be effectively improved.

The invention discloses a preparation method of bread containing a ternary covalent compound. The preparation method comprises the following steps: preparing the following raw materials: 300 g of flour, 90-120 g of water, 4-6 g of yeast powder and 30-50 g of granulated sugar; the bread is prepared from, by weight, 1-3 g of salt, 1-2 eggs, 4-6 g of bread improver and 25-35 g of butter. 3 g to 6 g of a ternary covalent complex; the bread raw materials are mixed and kneaded into dough for primary fermentation, the dough is divided and put into a mold for secondary fermentation after primary fermentation, baking is conducted after secondary fermentation is completed, and finished bread is obtained after baking is completed. The protein-polysaccharide-polyphenol ternary complex is added into the bread, so that the oxidation resistance of the bread can be effectively improved, the digestion degree of procyanidine in the stomach is reduced, the absorption effect of intestinal tracts is improved, the bioavailability is improved, and meanwhile, the stability of the bread is also improved. The polyphenol is stable in the stomach, can be massively released in the intestinal tract after being digested in the intestinal tract, is favorable for maintaining the balance of beneficial bacteria and harmful bacteria in the intestinal tract, and promotes the health of the intestinal tract.

The invention discloses a preparation method and application of an iron-doped molybdenum disulfide / polymer-based composite solid-state electrolyte, and relates to the technical field of solid-state batteries. After the iron element is doped, defects are introduced into the structure of the modified molybdenum disulfide, phase change is induced, dissociation of the lithium salt is promoted through synergism of the modified molybdenum disulfide and the iron element, and more free lithium ions are released; and meanwhile, the proportion of an amorphous region of the polymer electrolyte is increased, so that the ionic conductivity is improved, and the oxidation resistance is enhanced. In addition, the iron-doped molybdenum disulfide can effectively catalyze decomposition of lithium salt anions, and construction of a uniform and stable solid electrolyte interface (SEI) layer on the surface of the electrode is facilitated. The all-solid-state lithium metal battery assembled based on the modified solid electrolyte shows excellent electrochemical performance.

The invention relates to the technical field of electrolyte, in particular to a thioether cross-linked solid polymer electrolyte membrane as well as a preparation method and application thereof. The preparation method comprises the following steps: taking N, N-dimethylformamide, respectively adding 3, 6-dioxa-1, 8-octane dithiol and triglycidyl isocyanurate, and uniformly stirring to obtain a mixed solution; adding bis (trifluoromethylsulfonyl) imide lithium into the mixed solution, putting magnetons on a magnetic stirrer, and completely dissolving the magnetons to obtain a precursor solution; and pouring a proper amount of the precursor solution into a polytetrafluoroethylene mold, spreading, and carrying out cross-linking polymerization in a blast oven to form the film. The three-dimensional thioether cross-linked network structure has a large number of weakly coordinated thioether groups, dissociation of lithium salt can be promoted, a large number of free Li < + > is generated, the number of Li < + > is increased, meanwhile, the crystallinity of a polymer is remarkably reduced, the ionic conductivity is improved, the mechanical stability of a film can be improved, and the service life of a battery is effectively prolonged.

The invention provides a polylactic acid material environment-friendly skin-friendly natural antibacterial double-layer fabric and a preparation method thereof, and belongs to the technical field of fabrics. Polylactic acid long fibers, combed long stapled cotton yarns and antibacterial spandex are combined, a double-sided circular knitting machine is adopted for weaving, grey cloth is woven according to a designed organization structure, the grey cloth is subjected to pre-shaping, hair removal through cellulase, dyeing through reactive dye and disperse dye, liquid ammonia finishing is conducted after drying is conducted through loose drying equipment, and the antibacterial fabric is obtained. During shaping, soft oil finishing and preshrinking finishing are carried out, and the polylactic acid material environment-friendly skin-friendly natural antibacterial double-layer fabric is prepared. The polylactic acid fiber is combined with high-quality cotton yarn and antibacterial spandex, and meanwhile, the polylactic acid material environment-friendly skin-friendly natural antibacterial double-layer fabric is prepared through the special design of a weaving method and the working procedures of enzyme washing treatment, liquid ammonia treatment, silicone oil treatment and the like.

The invention relates to the technical field of lithium battery additives, in particular to a positive electrode softener, lithium ion battery positive electrode slurry and a preparation method, the positive electrode softener is a binary, ternary or multipolymer of olefin containing carbon-carbon double bonds and ester containing carbon-carbon double bonds, is an amorphous material with a low glass transition temperature, and can be applied to lithium ion batteries. Good affinity with a conductive agent material is realized. In the optimal addition amount range, the positive softener can reduce the viscosity of positive slurry, improve the dispersion uniformity of a conductive agent, improve the compaction density of a positive electrode and the flexibility of a pole piece, and solve the problems of low compaction degree and high brittleness of the pole piece of an existing lithium battery; therefore, the lithium ion battery adopting the positive electrode slurry has excellent processing performance and electrical performance.

The invention relates to the technical field of synthetic fiber paper manufacturing, in particular to meta-aramid paper and a preparation method thereof.The preparation method comprises the steps that para-aramid chopped fibers and potassium hydroxide are added into dimethyl sulfoxide, then water is added, stirring and dispersing are conducted, and nanofiber dispersion liquid is obtained; adding meta-aramid chopped fibers into the nanofiber dispersion liquid for defibering, and uniformly mixing to obtain a meta-aramid chopped fiber dispersion liquid; the preparation method comprises the following steps: continuously and stably adding a meta-aramid polymer liquid, a nanofiber dispersion liquid and a precipitation agent into precipitation equipment, carrying out high-speed shearing to obtain a fibrid, carrying out cooling molding in a water washing pool, and carrying out multi-stage water washing to obtain the meta-aramid fibrid, the meta-aramid chopped fiber dispersion liquid and the meta-aramid fibrid are subjected to defibering and stirring and then subjected to wet forming, squeezing, drying and hot pressing, and the meta-aramid paper is obtained. The meta-aramid paper has higher tensile strength, uniformity, tightness and insulating property, and better internal binding force and surface strength.

The invention discloses a high-conductivity composite solid electrolyte membrane and a preparation method and application thereof. Belongs to the solid-state battery field. The high-conductivity composite solid electrolyte is prepared from a lithium salt, an inorganic nanofiber membrane serving as a network framework and polyethylene oxide (PEO) serving as a high polymer matrix, the thickness of the film is 20-50 [mu] m; the lithium salt is selected from at least one of LiTFSi, LiFSi and LiClO4; the molecular weight of the polyethylene oxide is 200000 to 2000000 g / mol; the wire diameter of the inorganic nanofiber membrane is 300-600 nm, and the thickness of the inorganic nanofiber membrane is 15-40 [mu] m.

The invention belongs to the technical field of preparation and application of polyurethane, and particularly relates to a chemically recyclable biodegradable PPDO (poly (p-dioxanone))-based polyurethane material as well as a preparation method and application thereof. According to the invention, PPDO with biodegradability and chemical recoverability is used as a main raw material, and a polyurethane material is prepared through a chain extension reaction; carbon groups, ether bonds and the like in a PPDO molecular chain can form multiple intermolecular interaction with carbamate bonds, and the polyurethane material has excellent and adjustable mechanical strength and relatively high thermal stability under the microphase separation action of polyurethane; the cyclic ester monomer in a polyurethane molecular chain can be recovered through simple pyrolysis and is used for preparing a polyurethane material again, so that complete recovery and closed-loop circulation are realized; and when being discarded in the environment, the compound can be completely biodegraded into small molecular compounds which are harmless to the environment.

The present invention belongs to the technical field of polyurethane acrylate, and specifically relates to a polyurethane acrylate for UV light-curing adhesive, and a preparation method and application thereof. The polyurethane acrylate for UV light-curing adhesive described in the present invention is made of the following raw materials: 30-80 parts of unsaturated polyester polyol, 24-32 parts of isocyanate intermediate, and 2-6 parts of hydroxy acrylate; the unsaturated polyester polyol is prepared using unsaturated small molecule dibasic acid, saturated small molecule dibasic acid, and small molecule diol as raw materials; the isocyanate intermediate is prepared by reacting isocyanate monomer with polyol. The polyurethane acrylate for UV light-curing adhesive of the present invention is applied to the preparation of UV light-curing polyurethane acrylate adhesive, which improves the ability of UV light-curing adhesive to resist high temperature and high humidity, and improves its service life; the present invention also provides its preparation method.

The invention provides a preparation method of a triazine halamine antibacterial agent and a precursor thereof, and also provides a preparation method of a liquid ammonia mercerized antibacterial fabric. The preparation method of the liquid ammonia mercerizing antibacterial fabric comprises the following steps: soaking a fabric in anhydrous liquid ammonia under a tension-free condition, drying and cleaning; dissolving a halamine antibacterial precursor and a metal salt catalyst in water to prepare an antibacterial finishing solution, and dipping the liquid ammonia mercerized fabric in the antibacterial finishing solution; adding a solid alkali agent into the antibacterial finishing liquid, continuously dipping the liquid ammonia mercerized fabric, washing with water, and drying; soaking the fabric in a sodium hypochlorite solution for reaction, taking out and drying to obtain the liquid ammonia mercerizing antibacterial fabric. The liquid ammonia is adopted for pretreatment of the fabric, the excellent mercerizing effect is given to the fabric, meanwhile, the grafting rate of the halamine antibacterial agent is remarkably increased, the antibacterial agent can be more firmly finished on the fabric at the low temperature, the reaction process is simple, the production speed is high, efficiency is high, no toxicity and no pollution are achieved, and the processing requirements of ecological textiles are met.

The invention provides a preparation method of sealing aging resistant PBAT resin, biodegradable plastic and application, and the preparation method comprises the following steps: mixing adipic acid, butanediol and a first catalyst, and carrying out a first esterification reaction to obtain a first intermediate product; mixing terephthalic acid, m-phenylenediacetic acid, butanediol and a second catalyst, and carrying out a second esterification reaction to obtain a second intermediate product; performing a pre-polycondensation reaction on the first intermediate product, the second intermediate product and a pre-polycondensation catalyst in a polymerization reaction kettle to obtain a pre-polycondensation product; and carrying out final polycondensation on the pre-polycondensation product to obtain the sealing aging resistant PBAT resin. The edge sealing bag prepared from the sealing aging-resistant PBAT resin provided by the invention has more excellent sealing performance, and the sealing aging-resistant performance of the edge sealing bag is better.

The invention discloses a bimetallic asymmetric reduction Schiff base catalyst for synthesizing ethylene carbonate and a preparation method of the bimetallic asymmetric reduction Schiff base catalyst. According to the catalyst, a diamine compound is subjected to selective single-side protection, the imine reduction position is controlled, and a bimetallic active center is introduced; the controllable synthesis of a product for reducing the outer side imine and a product for reducing the inner side imine is realized; the obtained product is recrystallized to obtain a monoimine-monoamine type ligand with a clear asymmetric structure, the monoimine-monoamine type ligand and metal salt form a bimetallic catalyst, and the catalyst generates a synergistic effect through double active sites and shows high catalytic activity and excellent product selectivity.

The invention provides application of polysulfide in a lithium metal battery, the lithium metal battery and a solid-state battery. Wherein the polysulfide is used as an electrolyte of a lithium metal battery or an additive of a polymer electrolyte; the structural general formula of the polysulfide is Li2Sn, and n is greater than 2 and less than or equal to 6. Polysulfide can react with lithium metal to generate Li2S2 / Li2S, so that chemical components of an SE I layer interface are changed, a sulfur-containing inorganic SE I layer is formed on the surface of a negative electrode, and the mechanical property of the SE I layer and the interface stability of electrolyte / electrolyte and metal lithium are improved; and the Li2S2 / Li2S can also reduce the transfer impedance of Li < + >, promote the uniform deposition of lithium ions and inhibit the growth of lithium dendrites. And on the other hand, the high polarizability between Li < + > and the polysulfide anion Sn < 2-> can weaken the combination of a solvent or a polymer substrate and Li < + >, accelerate the migration of Li < + > and promote the diffusion rate of Li < + > in the battery.

The invention relates to the technical field of synthetic fiber paper manufacturing, in particular to aramid-based heating paper and a preparation method thereof.The preparation method comprises the steps that para-aramid chopped fibers and potassium hydroxide are added into dimethyl sulfoxide, then water is added, stirring and dispersing are conducted, and nanofiber dispersion liquid is obtained; adding carbon fibers and aramid chopped fibers into the nanofiber dispersion liquid for defibering, and uniformly mixing to obtain chopped fiber dispersion liquid; the preparation method comprises the following steps: adding a meta-aramid polymer liquid, a nanofiber dispersion liquid and a precipitation agent into precipitation equipment, carrying out high-speed shearing to obtain a fibrid, carrying out cooling molding in a water washing pool, and carrying out multi-stage water washing to obtain a meta-aramid fibrid; and uniformly mixing the chopped fiber dispersion liquid and meta-aramid fibrid, and then carrying out wet-process papermaking, squeezing drying and hot-pressing treatment to obtain the aramid-based heating paper. According to the preparation method, the carbon fibers and the aramid chopped fibers can be well dispersed, and the prepared aramid-based heating paper has higher uniformity and better mechanical properties and heating performance.

This invention belongs to the field of hard carbon technology, specifically relating to a bamboo-based and lignin-based hard carbon composite material, its preparation method, and its applications. The process involves pretreating raw materials to obtain pretreated material; pretreating the pretreated material with an acidic oxidant to obtain acidic oxidant pretreated material; pre-oxidizing the acidic oxidant pretreated material to obtain pre-oxidized material; pre-carbonizing the pre-oxidized material under a protective atmosphere to obtain pre-carbonized material; pulverizing the pre-carbonized material to obtain pulverized material; acid washing followed by water washing to obtain purified material; soaking the purified material in acid, filtering, and drying to obtain soaked material; mixing the soaked material with a modifier, and high-temperature coating and carbonizing under a protective atmosphere to obtain bamboo-based coated hard carbon or lignin-based coated hard carbon. Mixing the two types of hard carbon and carbon coating yields a bamboo-based and lignin-based hard carbon composite material, which is used in negative electrode sheets and batteries. When applied to batteries, the hard carbon composite material of this invention can improve battery energy density.