102 results about "Polycarbonic acid" patented technology

The invention provides a method 100 for separating different polymeric spectacle lens materials in a mixture comprising at least two different polymeric spectacle lens materials by separating at least one polymeric spectacle lens material of the at least two different polymeric spectacle lens materials by using their different physical behavior and / or chemical behavior, wherein the at least two different polymeric spectacle lens materials are selected from the group consisting of polyallyl carbonate, polyurea, polyurethane, polyurethane / polyurea, polycarbonate, polyepisulfide and polythiourethane. The invention further provides a method for separating at least one polythiourethane from a mixture comprising at least two different polythiourethanes by thiolysis.

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 belongs to the technical field of biodegradable high polymer materials, and particularly discloses a PLA / PPC degradable spinning material and a preparation method thereof. The PLA / PPC degradable spinning material is prepared from the following raw materials in parts by weight: 65 to 75 parts of terminated polypropylene carbonate, 15 to 20 parts of polylactic acid, 1 to 2 parts of epoxidized soybean oil, 7 to 10 parts of composite Na-montmorillonite, 3 to 5 parts of light calcium carbonate, 6 to 9 parts of rice straw fiber, 0.6 to 0.8 part of cross-linking agent, 0.2 to 0.5 part of antioxidant, 1 to 2 parts of maleic anhydride grafted PLA compatilizer, 0.07 to 0.01 part of catalyst and 0.3 to 0.5 part of silicone. Various raw materials are mixed, so that the mechanical property of the material is remarkably improved, the material has good strength and toughness, and the comprehensive performance of the material is improved.

The invention relates to the technical field of modified polyurethane preparation, in particular to a modified rigid polyurethane foam material and a preparation method thereof.The material is specifically prepared from CO2-based polyol, polyether, deionized water, a foaming agent, a catalyst, a foam stabilizer and isocyanate. Wherein CO2-based polyol is introduced into original polyether polyol, specifically, poly (ethylene carbonate) polyol is added, so that the heat conductivity coefficient of the material can be reduced, the compression strength of the material can be improved, and the low-cost and high-performance polyurethane foam can be prepared. The finally prepared rigid polyurethane foam material has the characteristics of good heat insulation property and high pressure resistance; and the whole preparation process is simple, the whole cost is low, and the market competitiveness is high.

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 lithium battery electrolyte, in particular to a composite enhanced solid electrolyte membrane and a preparation method thereof. The polymer solid electrolyte is a polycarbonate-based solid electrolyte such as a poly (ethylene carbonate)-based solid electrolyte PVC, a poly (vinylene carbonate)-based solid electrolyte PEC, a poly (propylene carbonate)-based solid electrolyte PPC, a poly (propylene carbonate)-based solid electrolyte PTMC and a polyoxyethylene-based solid electrolyte. The electrolyte is one or more of polysiloxane-based polymer electrolyte and single-lithium-ion conductive polymer electrolyte materials. The composite enhanced solid electrolyte membrane is disclosed. The preparation method comprises the following steps: preparing the three-dimensional nanofiber skeleton through electrostatic spinning, loading the two surfaces of mixed slurry of the polymer electrolyte and the lithium salt on the base membrane in an inert atmosphere, and carrying out vacuum curing molding. The composite membrane has high safety and a wide electrochemical window, the process of the composite membrane is compatible with an existing lithium battery production line, the raw material cost is controllable, and the composite membrane has large-scale commercial application potential.

The invention belongs to the technical field of degradable packaging materials, and discloses a preparation method of a degradable preservative film. The anti-fog antibacterial plastic is prepared from the following raw materials in parts by weight: 40 to 45 parts of poly (butylene adipate-co-terephthalate) (PBAT), 8 to 12 parts of polylactic acid (PLA), 28 to 32 parts of modified structural starch, 4 to 6 parts of poly (butylene carbonate) (PBC), 4 to 6 parts of talcum powder, 0.4 to 0.6 part of aluminate, 0.8 to 1.2 parts of a composite antibacterial agent and 2.5 to 3.5 parts of anti-fog master batch. The invention aims to overcome the defects in the prior art, and provides the degradable preservative film and the preparation method thereof, the preservative film not only has good degradability and mechanical properties, but also has excellent antibacterial and antifogging effects, and the preparation process is simple and easy for industrial production.

The invention belongs to the field of modification of degradable fat polycarbonate materials, and particularly relates to a PCHC / PPC composite material and a preparation method thereof. A PCHC matrix material is added into PPC for blending modification, a PCHC / PPC blended matrix material is obtained, hydrophobic microcrystalline cellulose is further added, and the PCHC / PPC composite material is obtained. The invention aims to break through the limitation of an existing degradable material in specific application, the performance of a polypropylene carbonate PPC material is better improved through a layer-by-layer progressive optimization strategy, and a novel polycarbonate composite material is obtained, so that the thermal stability and the mechanical property of the material are improved, and wider application requirements are met.

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 belongs to the technical field of coatings, and particularly relates to a water-based woodware varnish as well as a preparation method and application thereof. The water-based wood top-coat comprises a water-based emulsion, an organosilicon compound, a functional additive, a thickening agent, a wetting agent and water, the water-based emulsion comprises a self-crosslinking acrylic copolymer emulsion and an emulsion A; the emulsion A is selected from any one of self-crosslinking acrylic acid homopolymerized emulsion and polycarbonate modified polyurethane emulsion; the organosilicon compound comprises at least one of silane and silanol; the functional auxiliary agent comprises any one of a functional auxiliary agent 1 and a functional auxiliary agent 2; the functional additive 1 comprises a mildew preventive A and a mildew preventive B; the functional auxiliary agent 2 comprises a mildew preventive C, an ultraviolet light absorber and an ultraviolet light stabilizer; the thickeners include high shear, medium shear, and low shear polyurethane thickeners. The water-based woodware varnish disclosed by the invention has good comprehensive properties such as mildew resistance, weather resistance, chemical resistance and blocking resistance, and can be used for coating outdoor woodware or semi-outdoor woodware.

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 utility model discloses a burr removing device for processing a polycarbonate plate for a terrain vehicle, relates to the technical field of processing of the polycarbonate plate for the terrain vehicle, is suitable for removing edge burrs during processing of the polycarbonate plate for the terrain vehicle, and comprises a processing table, the transmission wheel is arranged in the processing table and is used for transmission; the limiting driving unit is arranged on the outer surface of the machining table and used for limiting; and the polishing unit is arranged at the top of the machining table and used for polishing. According to the device, the first hydraulic cylinder, the limiting sliding rod, the mounting plate, the fixing plate, the limiting wheel, the first driving motor, the driving wheel and the belt are matched with one another, so that the polycarbonate plate can be conveniently driven to move on the outer surface of the transmission wheel; and a fixing frame, a second driving motor, a lead screw, a limiting rod, a second hydraulic cylinder, a telescopic limiting rod, a mounting frame, a first polisher and a second polisher are matched with one another, so that the edge of the polycarbonate board can be conveniently polished, and the functionality of the removing device 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.

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 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 invention discloses a castor oil-polycarbonate copolymer for plasticizing polyvinyl chloride and a preparation method of the castor oil-polycarbonate copolymer. The castor oil-polycarbonate copolymer can be prepared by adopting solution or bulk polymerization, under the catalytic action of a Lewis acid-base pair or an initiation-catalysis bifunctional catalyst, firstly, an epoxy monomer and an initiator are subjected to reaction chain initiation, then chain transfer occurs, and a polycarbonate chain segment continues to grow on castor oil, so that the castor oil-polycarbonate copolymer is obtained. Compared with the existing commercialized polyvinyl chloride plasticizer, the castor oil-polycarbonate copolymer has the advantages of greenness, degradability, excellent toughening effect and lower preparation cost, has the advantages of no toxicity, difficulty in migration or leaching and the like due to a star-shaped structure and high molecular weight, and has a wide application prospect.

The invention discloses a preparation method of carbon dioxide-based polycarbonate dihydric alcohol, and the dihydric alcohol is prepared by taking aromatic micromolecular dihydric alcohol as a chain transfer agent through one-pot one-step polymerization reaction of epoxide and carbon dioxide under the action of a non-metal catalyst. The method for adjusting copolymerization by using carbon dioxide and epoxide has the innovation that aromatic micromolecular dihydric alcohol is used as a chain transfer agent for the first time, a benzene ring structure is introduced to polycarbonate dihydric alcohol, and a rigid group is introduced to a molecular structure, so that the thermal stability is improved while the degradability of the polymer dihydric alcohol is ensured. The end of the carbon dioxide based polycarbonate diol prepared by the invention is completely hydroxyl, the number-average molecular weight range is 1400-6300g / mol, the polycarbonate content in a chain segment is adjustable and can reach 71-87%, and the carbon dioxide based polycarbonate diol has good heat resistance and biodegradability.

The present disclosure relates to a polyalkylene carbonate-polylactic acid composite having improved mechanical properties as well as excellent transparency and flexibility, a method of preparing the same, and a molded article prepared by using the polyalkylene carbonate-polylactic acid composite.

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.

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 relates to the technical field of light-cured polyurethane materials, in particular to ultraviolet light-cured poly (ethylene carbonate)-based polyurethane resin and a preparation method thereof. The preparation method of the ultraviolet curing poly (ethylene carbonate)-based polyurethane resin comprises the following steps: (1) carrying out reaction on poly (ethylene carbonate) diol and diisocyanate under the action of a catalyst to obtain a first precursor; (2) adding a reactive monomer into the first precursor until an NCO group disappears, adding a metered polymerization inhibitor, and cooling to obtain a second precursor; and (3) heating and stirring the second precursor, a phosphorus-containing olefine acid ester monomer, a reactive diluent and a photoinitiator to obtain the ultraviolet-cured poly (ethylene carbonate)-based polyurethane resin. The environment-friendly reaction type phosphorus-containing flame retardant is used in the synthesis process, so that the problem of precipitation of the flame retardant can be effectively solved.

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 utility model relates to the technical field of coalescence filter elements, and discloses a coalescence filter element special for polycarbonate solution, which comprises an outer framework, one end of the outer framework is provided with an upper end cover, the inner wall of the upper end cover is provided with a mounting groove, and the inner wall of the mounting groove is slidably connected with a plurality of sliding rings. A plurality of supporting columns are fixedly connected between every two adjacent sliding rings, a first rotating column is rotationally connected between every two adjacent sliding rings, a pressing block is fixedly connected to the outer wall of each first rotating column, a second rotating column is fixedly connected to one end of each pressing block, and the two ends of each second rotating column are rotationally connected with the inner wall of the corresponding mounting groove. The outer wall of the sliding ring is fixedly connected with a rack. According to the utility model, the upper end cover is convenient to mount and dismount by rotating the pressing block, the filter element is maintained, and the multi-layer structure meets the requirement of separating a water phase from a polycarbonate solution and the requirement of compatibility between the coalescer and a saline-alkaline solution medium.

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 present invention discloses a hyperbranched high molecular weight poly(propylene carbonate) for photovoltaic module encapsulation and its preparation method. The poly(propylene carbonate) is prepared by chain extension of a carbon dioxide-based polycarbonate diol containing long branched chains with triisocyanate and a small molecule diol. The poly(propylene carbonate) has the advantages of good mechanical properties, high light transmittance, excellent water and oxygen barrier properties, anti-yellowing, resistance to ultraviolet aging, hydrolysis resistance, and high bonding strength. At the same time, the hyperbranched structure can reduce the fluidity of the PPC-T film at high temperatures, ensuring the integrity of the photovoltaic module at high temperatures. When the poly(propylene carbonate) replaces the EVA film for photovoltaic module encapsulation, no additional heat cross-linking is required, which can simplify the production steps of photovoltaic cells and effectively improve production efficiency. In addition, the PPC-T film can avoid the generation of acidic molecules, reduce the damage to photovoltaic cell modules, and thus extend the service life.

The invention relates to the technical field of adhesive tapes, in particular to an ultralow-temperature-resistant adhesive tape and a preparation method thereof. The preparation method comprises the following steps: S1, mixing polyether polyol and diphenylmethane diisocyanate under the protection of nitrogen, reacting at 70-90 DEG C for 3-5 hours, and carrying out vacuum defoaming to obtain a component A; s2, mixing isophorone diisocyanate, polypropylene carbonate polyol, polyether polyol, modified polyol, a cross-linking agent, a catalyst, a latent curing agent, an adhesion promoter, nano calcium carbonate and fumed silica, stirring at 70-90 DEG C for 3-5 hours, and performing vacuum defoaming to obtain a component B; s3, uniformly mixing the component A and the component B to obtain the ultralow-temperature-resistant adhesive which not only has excellent mechanical properties, but also has relatively good ultraviolet aging resistance.