98 results about "Polypropylene carbonate" patented technology

The invention belongs to the technical field of polyurethane resin, and provides polyurethane resin, polyurethane synthetic leather and a preparation method and application thereof. The preparation raw materials of the polyurethane resin comprise the following components in percentage by mass: 11%-18% of modified polyol, 3%-9% of bio-based polyol A, 0.01%-0.02% of an antioxidant, 0.001%-0.003% of a catalyst, 5%-7% of isocyanate, 0.5%-3% of a chain extender, 0.1%-0.4% of a terminator, 0.02%-0.04% of an anti-visbreaking aid, 0.5%-3% of a polyether aid and 68%-73% of a solvent, wherein the preparation raw materials of the modified polyol comprise bio-based polyol, alcohol amine and binary acid; the bio-based polyol A comprises bio-based polypropylene carbonate dihydric alcohol. The polyurethane synthetic leather prepared by the preparation method disclosed by the invention has good slip resistance, excellent perspiration-resistant color fastness and relatively high blackness, and is suitable for yoga mats.

The invention relates to the technical field of polyurethane, and discloses hyperbranched polyurethane with high tensile strength and a preparation method thereof, maleic anhydride grafted POE and hydroxyethylamine p-amino triazine compound are subjected to acylation ring opening to obtain polyhydroxy triazine crosslinked POE; the preparation method comprises the following steps: reacting isophorone diisocyanate with polypropylene carbonate glycol at first, and then reacting with polyhydroxy triazine cross-linked POE (Polyolefin Elastomer) to obtain hyperbranched polyurethane with high tensile strength. The prepared polyhydroxy triazine cross-linked POE contains more reaction sites, the reaction cross-linking degree can be improved when the polyhydroxy triazine cross-linked POE reacts with a prepolymer, the polyhydroxy triazine cross-linked POE further contains unreacted hydroxyl, amino and other strong polar groups, intermolecular hydrogen bonds are formed, in addition, the maleic anhydride grafted POE elastomer can also absorb a large amount of impact energy, and the impact strength of the polyhydroxy triazine cross-linked POE is improved. The mechanical properties such as tensile strength of the hyperbranched polyurethane are further improved.

The invention relates to a preparation method and application of a silicon-based biodegradable essence microcapsule, and the preparation method of the silicon-based biodegradable essence microcapsule comprises the following steps: S1, uniformly mixing oily essence and a silicon-based mesoporous material to obtain an oil phase; dissolving an emulsifier in water to obtain a water phase; s2, mixing the oil phase and the water phase, and homogenizing to obtain an emulsion; and S3, adding a diisocyanate compound and polypropylene carbonate into the emulsion, and carrying out a stirring reaction to obtain the silicon-based biodegradable essence microcapsule. A silicon-based mesoporous material is introduced in the process of preparing the essence microcapsule by taking polypropylene carbonate as a wall material, a synergistic wrapping system of the essence microcapsule is constructed, and the volatile essence is subjected to double-layer protection by utilizing a mode of combining physical adsorption and chemical crosslinking embedding, so that the fragrance retention time of the essence is prolonged, and the fragrance retention time of the essence is prolonged. Meanwhile, the embedding rate of the microcapsule can be effectively improved, and the application of the essence microcapsule in actual production can be promoted by combining the biodegradable characteristic of the polypropylene carbonate.

The invention relates to the technical field of polymer composite materials, in particular to a degradable PPC-based composite film as well as a preparation method and application thereof. The degradable PPC-based composite film is prepared from polypropylene carbonate, bamboo powder and vinyl trimethoxy silane. Polypropylene carbonate (PPC) is adopted as a base material, bamboo powder is combined for filling, the prepared composite film can be completely degraded after being buried in natural soil for 5 months, and degradation products of the composite film do not pollute the environment; the bamboo powder is adopted as a reinforcing filler, has a certain bacteriostatic effect, and can be used for delaying the growth of microorganisms on the surface of food and improving the food safety and the fresh-keeping effect if being applied to the food fresh-keeping film. Compared with a pure PPC film, the composite film disclosed by the invention is improved in the aspects of mechanical property, thermal stability and glass transition temperature, and shows more excellent comprehensive performance.

The invention relates to the technical field of biodegradable high polymer materials, in particular to a tear-resistant high-barrier biodegradable mulching film and a preparation method thereof, and the tear-resistant high-barrier biodegradable mulching film is prepared from the following raw materials in parts by weight: 60-90 parts of poly (butylene adipate-co-terephthalate); 10 to 40 parts of poly (propylene carbonate); 0.5-5 parts of a plasticizer; 0.05 to 0.3 part of a cross-linking agent; 0.1 to 10 parts of talcum powder; 0.1 to 2 parts of a lubricant; 0.1-1 part of an anti-blocking agent; 0.1 to 1 part of an antioxidant; 0.1 to 1 part of an anti-ultraviolet agent; 0.1-1 part of a light stabilizer; 0.1 to 1 part of an anti-hydrolysis agent; 0.1-1 part of a nucleating agent; the plasticizer is poly (1, 2-propylene glycol adipate); and the cross-linking agent is 1, 4-bis (tert-butylperoxy) diisopropyl benzene. The film has good mechanical properties and water vapor transmission amount, can be completely biodegraded, and has good aging resistance.

The invention relates to the technical field of fracturing proppants, in particular to a method for preparing a low-density ceramsite sand fracturing proppant by taking magnesium oxide as a raw material, kaolinite coal gangue and solid waste ceramsite sand powder are adopted as main raw materials of inner core particles, magnesium oxide is introduced to reduce the density of the proppant, and the magnesium oxide acts with manganese oxide, potassium feldspar and dolomite to reduce the sintering temperature; the composite biomass-based porous activated carbon is used as a framework; the modified epoxy resin, the composite biomass-based porous activated carbon and the curing agent are used for preparing a self-repairing high-temperature-resistant, hydrophobic, wear-resistant and corrosion-resistant outer-layer coating film, so that the ceramsite sand fracturing propping agent is endowed with durable high flow conductivity; the self-repairing polyurethane is prepared by taking hydroxyl-terminated long alkyl chain Schiff base as a modifier in a prepolymerization process, taking polypropylene carbonate glycol, polytetrahydrofuran ether glycol and isophorone diisocyanate as raw materials, taking 2, 6-diaminopyridine as a chain extender and taking a carboxyl-containing imidazolyl hydrophobic copolymer as an end-capping reagent.

The invention relates to the field of high polymer material processing, and discloses a high-efficiency low-energy-consumption granulation process and system for a full-biodegradable multiphase composite material, and the process comprises the following steps: feeding raw materials such as polypropylene carbonate, polyester, plant fibers and four-stage activated biomass hydroxyapatite into a double-screw extruder with the length-diameter ratio of not less than 64: 1 in a grading manner according to heat sensitivity; the temperature, the pressure and the shear field are cooperatively controlled, and three-section type temperature distribution of intensified melting, short-time reaction and rapid cooling is established; and carrying out three-stage gradient vacuum devolatilization and underwater pelletizing to obtain a finished product. The four-stage activated biomass hydroxyapatite is prepared by plasma etching, hydrophobic coating, interface coupling and melt pre-dispersion. The problem of degradation of heat-sensitive components is solved through graded feeding and asymmetric temperature control, the dispersity and interface bonding force of the filler are improved by utilizing a four-stage activation technology, closed-loop control is realized by combining online rheology monitoring and an energy consumption model, and continuous production of the full-biodegradable material with low energy consumption, low volatile matter and high mechanical property is realized.

The invention discloses a high-flexibility bio-based polyurethane fluorescent material capable of being self-repaired at room temperature and a preparation method of the high-flexibility bio-based polyurethane fluorescent material, and belongs to the technical field of polyurethane materials. The preparation method comprises the following steps: generating a prepolymer from diisocyanate and polypropylene carbonate glycol under the action of a catalyst; carrying out chain extension reaction by taking dimethylglyoxime as a chain extender to generate a polyurethane material PUDMG containing ketoxime bonds; after PUDMG is dissolved, the PUDMG and a mixture of terbium nitrate hexahydrate and europium nitrate hexahydrate are subjected to a coordination reaction, and finally a target product is prepared. By introducing a dimethylglyoxime chain extender, a dynamic ketoxime bond is constructed in a polymer network, and the room-temperature efficient self-repairing of the material is realized; meanwhile, dimethylglyoxime provides effective coordination sites for Tb < 3 + > and Eu < 3 + >, and the dimethylglyoxime, the Tb < 3 + > and the Eu < 3 + > have a synergistic effect, so that the material is endowed with strong fluorescence performance, and meanwhile, the mechanical property and the self-repairing efficiency are further enhanced. The material is simple in preparation method and has a wide application prospect in the fields of flexible electronic devices and anti-counterfeiting.

The application discloses a solid-state electrolyte and a preparation method thereof and a solid-state battery. The solid-state electrolyte comprises a gel and a first fiber fabric; the gel coats the first fiber fabric and fills pores of the first fiber fabric; the first fiber fabric comprises first fibers interwoven together, and formation materials of the gel comprise an electrolyte and second fibers dissolved in the electrolyte; wherein the first fibers comprise polyvinylidene fluoride fibers, and the second fibers comprise polypropylene carbonate fibers. The application can improve the ion transmission capacity of the solid-state electrolyte under a liquid-poor condition, and has high safety.

The invention discloses a UV (ultraviolet)-heat dual-curing waterborne polyurethane emulsion and a preparation method thereof. According to the UV-thermal dual-curing waterborne polyurethane emulsion, the heat resistance, the water resistance and the mechanical property of UV-WPUA can be improved, and meanwhile, the storage stability and the yellowing problem of the UV-WPUA can be improved; the polyurethane foam is prepared from the following components in parts by weight: 60-70 parts of binary isocyanate; 35 to 45 parts of polypropylene carbonate; 0 to 12 parts of 1, 4-butanediol; 50 to 55 parts of an acrylate monomer; 0.1 to 0.2 part of p-hydroxyanisole; 0 to 18 parts of sulfydryl silane; 0.1 to 0.3 part of an organic tin catalyst; 5-10 parts of a solvent; 100 to 150 parts of deionized water; belongs to the technical field of coatings.

The invention relates to a biodegradable mulching film raw material composition, a biodegradable mulching film and a preparation method of the biodegradable mulching film. The invention relates to a raw material composition for a biodegradable mulching film. Comprising the following components in parts by weight: 50 to 90 parts of poly (butylene terephthalate)-adipate, 5 to 20 parts of composite powder, 0.2 to 1 part of a coupling agent, 0.2 to 1 part of a lubricant, 5 to 30 parts of polypropylene carbonate and a modifier, 0.1 to 1 part of a hydrolysis time regulator, 0.4 to 1 part of a hindered amine light stabilizer, 0.2 to 0.5 part of an antioxidant and 0.2 to 0.8 part of a compatilizer. Wherein the composite powder comprises calcium carbonate and talcum powder; the crystal diameter of the calcium carbonate is 2-5 nanometers, and the crystal is needle-shaped or fibrous; the crystal size of the talcum powder is 2-5 nanometers, the crystal is in a sheet shape or a scale shape, and the length-diameter ratio of the crystal is larger than or equal to 20: 1. The biodegradable mulching film formed by the raw material composition has low water vapor permeability, and the biodegradation time and the degradation rate can be regulated and controlled.

The invention discloses an SCR (Selective Catalytic Reduction) denitration catalyst regeneration method which comprises the following steps: carrying out cleaning and arsenic removal on an arsenic-poisoned SCR denitration catalyst, and regenerating to obtain a regenerated catalyst; preparing a mixed impregnation liquid containing a water repellent agent, polypropylene carbonate and an organic solvent; adhering the mixed impregnation liquid to the surface of the regenerated catalyst and immersing the mixed impregnation liquid into channels of the regenerated catalyst by using a vacuum pressure impregnation process; drying to remove the organic solvent, and curing the poly (propylene carbonate) on the surface and in pores of the regenerated catalyst; a heat treatment is performed to remove the poly (propylene carbonate) and induce chemical grafting of the hydrophobing agent to the catalyst to form a hydrophobic network. The hydrophobic agent is introduced into the surface and pore channels of the arsenic-removed catalyst to construct a hydrophobic network, so that the hydrophobicity of the regenerated catalyst is improved.

The application discloses a kind of Janus nanoparticles, its preparation method includes the following steps: (1) polypropylene carbonate diol (PPCD) is reacted with lysine diisocyanate, after reaction, TiO2 Hollow sphere dispersion is added in system, and TiO2 Hollow sphere of outer surface grafting PPCD is prepared;(2) after ultrasonic fragmentation, TiO2-PPCD nanoparticle is obtained, and then is reacted with silane coupling agent, poly-D-lactic acid (PDLA), and the Janus nanoparticle is prepared.The application is used to prepare biobased polyester composition, including the following weight parts of raw materials: polypropylene carbonate 60-90 parts, poly-D-lactic acid 10-40 parts, Janus nanoparticle 0.1-3 parts.The nanoparticle of the application effectively improves the compatibilization efficiency of the composition, and the tensile strength and elongation at break are also improved.

This invention discloses a photo / thermal dual-curing bio-based UV ink composition and its preparation method, relating to the field of UV-curable printing materials. It comprises the following raw materials in parts by weight: 100 parts of polypropylene carbonate diol-type polyurethane acrylate oligomer, 5-20 parts of a thermosetting component, 50-150 parts of an reactive diluent, 2-10 parts of a free radical photoinitiator, 0-80 parts of a colorant, and 0-10 parts of other additives; the thermosetting component includes eugenol-furfurylamine type benzoxazine monomer. The UV ink composition obtained by this invention can be heat-treated after photocuring. The polybenzoxazine network is interpenetrated after the formed polyurethane acrylate pre-crosslinked network, forming an interpenetrating or interpenetrating polymer network, and additional crosslinking can occur. This not only improves the strength and flexibility of the ink layer but also effectively enhances solvent resistance and adhesion, resulting in a UV ink composition with excellent overall performance.

The invention relates to the technical field of catalysts, and discloses a boron-doped zinc glutarate nanoflower catalyst as well as a preparation method and application thereof, and the Nano-ZnGA-B nanocatalyst has a nanoflower morphology formed by cross assembly of thin sheets with relatively small sizes and relatively thin sheet layers. According to the preparation method, a nano-ZnGA-B nanoflower catalyst is synthesized by taking a surfactant containing amide carbonyl as a modifier and taking a boron-containing ligand as a dopant through a hydrothermal method, and the nano-ZnGA-B nanoflower catalyst is prepared through a simple and efficient chemical method. The catalyst shows excellent catalytic performance, and can catalyze the polymerization of propylene oxide and carbon dioxide under mild temperature (60-70 DEG C) and pressure conditions (3-4 MPa) to prepare the polypropylene carbonate with high thermal stability and good comprehensive performance, so that the degradable polypropylene carbonate product has wider application prospect and market value in industrial production.

This application discloses a composite fiber membrane and its preparation method, relating to the field of composite material technology. The preparation method includes: in-situ modification of a composite fiber membrane precursor with stearic acid to obtain the composite fiber membrane; the composite fiber membrane precursor is a polypropylene carbonate fiber membrane loaded with zinc oxide nanostructures. The composite fiber membrane proposed in this application, through in-situ modification of the polypropylene carbonate fiber membrane loaded with zinc oxide nanostructures using stearic acid, imparts hydrophobic properties to the composite fiber membrane. This prevents the rapid erosion of the zinc oxide nanostructures by environmental water molecules in humid environments, avoiding the problem of explosive release and rapid depletion of zinc ions in a short time, ultimately leading to antibacterial failure.

The present application relates to the field of film, specifically to a kind of high-temperature-resistant thermal medical film with stable imaging and its preparation process, introduce alumina phase in silica aerogel, modify silica aerogel doped with alumina phase with amino hetero naphthalene diphenyl poly aryl ether ketone;In order to give back layer, protective layer excellent mechanical damage resistance, make it after suffering mechanical scratch, self-repair at room temperature, restore excellent hydrophobicity, high temperature resistance, antistatic property, introduce self-repairing polyurethane in back layer and protective layer, with polypropylene carbonate glycol as soft segment, with isophorone diisocyanate as hard segment, 4,4'-dithiodiphenylamine, 4-hydroxyphenylboric acid as chain extender to synthesize self-repairing polyurethane;Epoxy silicone resin is used as the base coating of back layer and protective layer, introduce silicone slip agent in back layer, so that back layer has long-acting stable and non-migratory slip property.

The invention belongs to the field of lithium ion battery materials, and particularly relates to a solid electrolyte with high ionic conductivity and a preparation method thereof.According to the electrolyte, fluorinated cyclic carbonate grafted polyionic liquid is adopted as a polymer matrix, and lithium lanthanum zirconium oxide loaded on a nano graphene framework is matched to serve as ionic conductivity reinforcing filler; and adding lithium bis (fluorosulfonyl) imide, poly (propylene carbonate) and nano cellulose fibers, and compounding. The preparation method comprises the following steps: dissolving the fluorinated cyclic carbonate grafted polyion liquid and the lithium lanthanum zirconium oxide loaded on the nano graphene skeleton in anhydrous acetonitrile to form a solution, then adding the filler, the lithium salt and the cellulose fiber to form slurry, and carrying out coating, drying and hot press molding. According to the invention, a multi-layer ion transmission channel is constructed in the electrolyte, and the electrolyte has the characteristics of high ionic conductivity, wide electrochemical window, excellent interface stability and the like, can effectively inhibit the growth of lithium dendrites and improve the safety performance and cycle life of the battery, and is simple in preparation process, relatively low in cost and suitable for large-scale production.

The invention discloses a porous corn straw degradable film and a preparation method thereof, and belongs to the technical field of plastic films. The film is prepared from the following raw materials in parts by weight: 85-87 parts of polyadipic acid / butylene terephthalate (PBAT), 1-3 parts of polylactic acid (PLA), 5-10 parts of corn straw powder, 3-5 parts of polypropylene carbonate (PPC), 5-10 parts of starch, 3-5 parts of talcum powder and 1-3 parts of sodium bicarbonate. The preparation method comprises the following steps: drying and mixing the raw materials, carrying out melt blending in a double-screw internal mixer, carrying out granulation, and carrying out blow molding on the obtained master batch to prepare the film. The preparation method is characterized in that sodium bicarbonate is decomposed to release carbon dioxide gas during film blowing and heating, a uniform microporous structure is formed in a film matrix, and the decomposed product sodium carbonate plays a reinforcing role at the same time. The corn straw, the PPC, the starch and the talcum powder are added to generate a synergistic effect with a PBAT / PLA matrix, so that the mechanical property, the barrier property and the ultraviolet shielding function of the film are remarkably improved on the premise of ensuring complete biodegradability. The film has the advantages of being low in cost, uniform in pore structure, good in mechanical property, low in water vapor permeability, good in heat preservation effect and the like, and is an environment-friendly agricultural mulching film material with great application potential.

The invention relates to the field of high polymer materials, and particularly discloses a biodegradable composite express packaging bag and a preparation method thereof. A biodegradable composite express packaging bag comprises an outer layer film, a fiber layer, a framework layer, a fiber layer and an inner layer film. The outer layer film and the inner layer film are PBAT blended films, and the PBAT blended films are prepared from the following raw materials in parts by weight: 5 to 6 parts of PBAT resin, 1 to 1.5 parts of polyglycolic acid, 3 to 4 parts of polypropylene carbonate, 0.05 to 0.1 part of compatilizer, 0.15 to 0.2 part of antioxidant and 0.1 to 0.15 part of lubricant; the raw materials of the fiber layer comprise PBAT resin, PBST resin and a compatibilizer, and the fiber layer is prepared through melt differential electrostatic spinning; and the framework layer is an aramid nanofiber layer loaded with MOF-808. The biodegradable composite express packaging bag has the advantages of being high in longitudinal and transverse tensile strength, high in tear resistance, suitable for express packaging, capable of being biodegraded and excellent in barrier property.

The application relates to the technical field of biodegradable toy materials, and discloses a PFM-nanocellulose-hydroxyapatite synergistically reinforced biodegradable material and application, which is prepared from components such as polylactic acid, polybutylene adipate terephthalate, polypropylene carbonate, polybutylene succinate, hydrophobic pore-keeping modified plant fiber micro powder, antibacterial microcapsules, nanocellulose paste and grafting compatibilizer. In the preparation process, quaternary resin is premixed and melted, nanocellulose paste is injected laterally, and a high-vacuum in-situ devolatilization process is combined, so that liquid medium is removed in real time and in-situ dispersion of nanocellulose is realized. According to the scheme, a physical interwoven space reinforcing structure is constructed in the matrix, the toughness and the mechanical modulus of the material are synergistically improved, long-acting bacteriostasis is realized by relying on controlled release of the microcapsules, the problems of reinforcing phase agglomeration and short bacteriostasis time are solved, and the application is suitable for production of high-performance long-acting antibacterial biodegradable toys.

This invention discloses a nano-oxygen barrier functional masterbatch for the outer surface of packaging bottles and its preparation method, belonging to the field of polymer packaging material technology. The method involves first homogenizing and ultrasonically dispersing nisin, glycerol, montmorillonite K10, and silver nanoparticles in an aqueous phase, then adding nanocellulose to obtain a hybrid oxygen barrier suspension. Next, polylactic acid, polypropylene carbonate, and triglycidyl isocyanate are melted and laterally injected into the suspension. The mixture is then subjected to twin-screw extrusion, vacuum devolatilization, and granulation to obtain the masterbatch. This masterbatch can form an oriented "brick-and-mortar" barrier structure in the matrix, enhancing interfacial bonding and the stability of the nano-silver, significantly improving the oxygen barrier, moisture barrier, peel strength, and long-lasting antibacterial properties of the packaging outer surface.

There is a process for the preparation of polypropylene carbonate having the step of copolymerization of propylene oxide and carbon dioxide (CO2) in the presence of a catalytic system including:at least one catalyst selected from complexes of a transition metal having general formula (I):at least one co-catalyst selected from:(a) ionic compounds having general formula (II):and(b) ionic compounds having general formula (III):

The invention discloses a method for purifying and modifying polypropylene carbonate based on supercritical CO2. The method is characterized by comprising the following steps: carrying out dry mixing on a polypropylene carbonate raw material and an amino-modified nano filler which accounts for 5-10wt% of the mass of the polypropylene carbonate raw material; adding the mixed material into a screw extruder through a feeder, controlling the operation temperature of the screw extruder to be 60-120 DEG C, injecting supercritical CO2 with the pressure of 8-30 MPa and the temperature of 40-120 DEG C into the middle rear end of the screw extruder, feeding the material treated by the screw extruder into a drop-type devolatilization device, controlling the cavity temperature of the drop-type devolatilization device to be 60-120 DEG C and the vacuum degree to be 20-80 kPa, and carrying out vacuum drying, so as to obtain the high-temperature-resistant low-temperature-resistant low-temperature-resistant low-temperature-resistant low-temperature-resistant low-temperature-resistant low-temperature-resistant low-temperature-resistant low-temperature- The method has the advantages that the content of the propylene carbonate is remarkably reduced, and meanwhile, the mechanical property and the thermal stability of the material are improved.

The invention discloses a heat-resistant biodegradable film-making material, which is prepared from the following ingredients in parts by mass: 30 to 60 parts of modified polylactic acid, 20 to 35 parts of toughening agents, 10 to 18 parts of multifunctional modifiers, 0.4 to 1.4 parts of nucleating agents, 3 to 5 parts of plasticizers and 0.3 to 0.8 part of bio-based chain extenders. 0.3-10 parts of a composite heat stabilizer and 4-15 parts of an antibacterial agent; the modified polylactic acid is prepared from the following components in parts by mass: 35 to 50 parts of polylactic acid, 5 to 25 parts of polypropylene carbonate, 1 to 6 parts of micromolecular compatilizer and 0.2 to 2 parts of initiator. And the modified polylactic acid improves the biodegradation rate. The heat-resistant biodegradable film-making material disclosed by the invention has excellent temperature resistance, degradability, mechanical strength and toughness, can be widely applied to various industries, and has good application and market prospects. The invention also discloses a production process of the heat-resistant biodegradable film-making material.

The application discloses a polypropylene carbonate-based composite film and a preparation method thereof, and belongs to the field of packaging film material preparation. The polypropylene carbonate-based composite film prepared by the application comprises a PBAT heat-sealing layer, a modified PPC layer and a PLA layer, the PBAT heat-sealing layer and the modified PPC layer are bonded through a first bonding layer, and the modified PPC layer and the PLA layer are bonded through a second bonding layer. The preparation raw materials and the preparation raw material ratio of the PBAT heat-sealing layer, the first bonding layer, the modified PPC layer, the second bonding layer and the PLA layer are optimized, so that the compatibility between the raw materials is increased, the whole exhibits excellent high barrier property, thermal stability and mechanical property, the composite film can be biodegraded, is better applied in the field of environment-friendly functional packaging materials, and meets the market use demand.

The application relates to the technical field of fracturing proppants, in particular to a method for preparing low-density ceramic sand fracturing proppants by taking magnesium oxide as raw material, adopting kaolinite coal gangue and solid waste ceramic sand powder as main raw materials of core particles, introducing magnesium oxide to reduce the density of the proppants, reducing the sintering temperature by the action of manganese oxide, potassium feldspar and dolomite, taking composite biomass-based porous activated carbon as a skeleton, taking modified epoxy resin, composite biomass-based porous activated carbon and a curing agent to prepare an outer film which is self-repairable, high-temperature-resistant, hydrophobic, wear-resistant and corrosion-resistant, and endowing the ceramic sand fracturing proppants with durable high conductivity, taking a long-alkyl-chain Schiff base capped with a hydroxyl group as a modifier in a prepolymerization process, taking polypropylene carbonate glycol, polytetrahydrofuran ether glycol and isophorone diisocyanate as raw materials, taking 2,6-diaminopyridine as a chain extender, and taking an imidazole-based hydrophobic copolymer containing a carboxyl group as an end-capping agent to prepare self-repairing polyurethane.

The invention discloses a material for woven bags as well as a preparation method and application thereof, and relates to the technical field of processing of materials for woven bags. The woven bag material comprises a film covering material and a weaving wire material; wherein the film covering material comprises degradable resin B and a compatilizer; the degradable resin B comprises poly (butylene adipate-co-terephthalate) and polypropylene carbonate; the woven bag material prepared from the material for weaving the silk and the material for coating is low in cost, low in rigidity and good in toughness; the mechanical strength of the coated material for the woven bag is enhanced, the water resistance is improved, the service life of the material for the woven bag is prolonged, the degradation rate of the material in the using process is delayed, and closed loop of carbon circulation is effectively achieved. The preparation method of the material for the woven bag is simple to operate; the prepared material for the woven bag or the woven bag can be widely applied to the fields of agriculture, industry and logistics transportation.

The invention discloses a modified biodegradable polyester composite material based on a carbon dioxide and polypropylene carbonate copolymer as well as a preparation method and application of the modified biodegradable polyester composite material. The biodegradable polyester composite material based on the carbon dioxide polypropylene carbonate copolymer comprises modified PPC, a biodegradable polyester polymer, an inorganic mineral and / or organic starch, an antioxidant, a coupling agent, a lubricant and a chain extender. The modified poly (propylene carbonate) with a unique structure is introduced, so that the problems of poor barrier property, poor rigidity, poor transparency and the like of the traditional modified PBAT material can be solved. In addition, the product is relatively low in price, and can meet the requirements of development of agricultural mulching films in the field of biodegradable films.

A solid electrolyte, its preparation method, and a lithium-ion battery are disclosed, belonging to the field of solid electrolyte technology. This invention overcomes the shortcomings of existing PEO-based solid polymer electrolytes, such as low ionic conductivity and poor mechanical properties. The solid electrolyte of this invention comprises a crosslinked product of polyethylene glycol methyl ether acrylate and polyethylene glycol diacrylate, polypropylene carbonate, and a lithium salt; the average molecular weight of polyethylene glycol methyl ether acrylate is 300–500; the average molecular weight of polyethylene glycol diacrylate is 500–800; and the average molecular weight of the crosslinked product is 3000–6000.