177 results about "Polypropylene carbonate" patented technology

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 invention relates to the technical field of packaging bags, and discloses a moisture-proof medical packaging bag material and a preparation method thereof. The moisture-proof medical packaging bag material comprises a paper layer and a plastic layer, the paper layer comprises modified kraft paper, and the plastic layer comprises the following raw materials in parts by weight: 70-100 parts of polybutylene terephthalate adipate, 30-50 parts of polypropylene carbonate, 5-7 parts of modified mica and 1.5-3 parts of cellulose acetate oleate. The moisture-proof medical packaging bag material prepared by the invention has good water resistance and mechanical properties, also has good degradability, and has a good application prospect.

The invention provides a coated paper for packaging and a preparation method thereof. The coated paper comprises the following raw material components: 20-25 parts of modified corn starch citrate, 75-80 parts of alginic acid, 20-25 parts of polypropylene carbonate, 20-25 parts of polylactic acid, 1-3 parts of glycerol, 1-3 parts of polyhydroxystearic acid and 2-2.5 parts of carboxymethyl cellulose. The preparation method of the modified corn starch citrate comprises the following steps: in a reaction kettle, preparing a citric acid solution with a mass percentage of 0.8-1.2% by using distilled water, and heating the solution to 35-38 DEG C; starting stirring; adding corn starch to the citric acid solution while stirring, and reacting for 2.5-3 hours; then, adjusting the pH value of the solution in the reaction kettle to be alkaline with sodium hydroxide, cooling the solution to 26-28 DEG C, adding octenyl succinic anhydride and sodium alginate, and continuing stirring and reacting for 30-50 minutes; after the reaction, standing and filtering; drying and grinding the filtered solid to 80-100 meshes. The coated paper prepared by the invention is environmentally friendly, safe and easily degradable.

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 provides a full-biodegradable composite film and a preparation method thereof. The full composite membrane comprises an outer layer, a middle layer and an inner layer, wherein the outer layer comprises modified calcium carbonate, PLA, PBAT and an epoxy chain extender; the middle layer comprises modified montmorillonite, PLA (polylactic acid), PBAT (poly (butylene adipate-co-terephthalate)), PPC (polypropylene carbonate) and an epoxy chain extender; the inner layer comprises PLA (polylactic acid), PBAT (poly (butylene adipate-co-terephthalate)), an epoxy chain extender and an optional anti-blocking agent. The preparation method of the raw materials of the middle layer comprises the following steps: (i) dividing an epoxy chain extender used by the middle layer into an epoxy chain extender A and an epoxy chain extender B, and mixing PPC, modified montmorillonite and the epoxy chain extender A to prepare a first master batch of the middle layer; (ii) mixing PLA, PBAT and an epoxy chain extender B to prepare a middle-layer second master batch; and (iii) uniformly mixing the middle-layer first master batch and the middle-layer second master batch, extruding and granulating to obtain a middle-layer raw material. The full-biodegradable composite film prepared by the preparation method disclosed by the invention is good in uniformity and quality.

The invention relates to the technical field of noise reduction core materials, in particular to a mesoporous ceramic / chlorinated polypropylene carbonate sound insulation foam core material and a preparation method thereof, and the mesoporous ceramic / chlorinated polypropylene carbonate sound insulation foam core material is prepared from the following raw materials in parts by mass: 3-20 parts of mesoporous ceramic, 75.6-92.6 parts of chlorinated polypropylene carbonate, 4 parts of azodicarbonamide and 0.4 part of zinc oxide. The mesoporous ceramic / chlorinated polypropylene carbonate foam material has the advantages of being low in density, high in strength, excellent in sound insulation performance, environmentally friendly and the like, the transmission loss at the intermediate frequency of 1000-2000 Hz can reach 34-60 dB, the compression modulus can reach 10.6-26.8 MPa, the compression strength can reach 0.24-0.45 MPa, and the mesoporous ceramic / chlorinated polypropylene carbonate foam material can serve as a sound insulation foam core material to be filled in a building wall and has the advantages of being good in sound insulation performance and the like. Good application prospects are realized in the fields of wall earthquake prevention and sound insulation in the building industry.

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 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 the technical field of flame retardants, in particular to a magnesium hydroxide flame retardant suitable for a high-speed extrusion cable and a preparation method of the magnesium hydroxide flame retardant. According to the preparation method, magnesium hydroxide is induced to form a flaky crystal structure with a high radius-thickness ratio through the synergistic effect of polypropylene carbonate and tetrabutylammonium bromide, and multi-scale regulation and control of particle morphology and interface characteristics are realized in combination with surface modification of sodium stearate. The flame retardant shows excellent dispersion stability and interfacial compatibility in high-speed extrusion processing, and solves the problems of poor processing suitability and insufficient flame retardant efficiency caused by non-uniform dispersion and friction heat accumulation of the traditional magnesium hydroxide flame retardant.

The invention provides a polyurethane composite material, a preparation method and application thereof and an intelligent fabric liner material, and belongs to the field of solid lubrication. The preparation method comprises the following steps: mixing polypropylene carbonate glycol, isophorone diisocyanate, 2, 2-dimethylolpropionic acid and a catalyst, carrying out a prepolymerization reaction, mixing the obtained prepolymer, 4, 4 '-diaminodiphenyl disulfide and 4, 6-diaminopyrimidine, carrying out a chain extension reaction, mixing the obtained chain extension product with triethylamine, and carrying out a polymerization reaction to obtain polyurethane resin; and mixing polyurethane resin, the isocyanate functionalized boron nitride nanosheets and the carbon quantum dots to obtain the polyurethane composite material. According to the invention, an advanced polyurethane composite material is constructed by innovatively combining self-repairing, wear resistance and damage monitoring functions for the first time, and the properties are realized by a design strategy of combining isocyanate functionalized boron nitride nanosheets and carbon quantum dots with multiple dynamic reversible bonds (disulfide bonds and hydrogen bonds).

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 present application relates to the field of polymer materials, and specifically discloses a new antibacterial packaging bag material and a preparation method thereof. The new antibacterial packaging bag material includes the following components in parts by weight: 60-90 polyhydroxyalkanoate, 20-30 parts of polypropylene carbonate, 0.5-1 parts of zinc acetate, 3-6 parts of plasticizer, 5-15 parts of antibacterial masterbatch, 1-4 parts of antioxidant, 0.8-3.2 parts of degradation promoter; the antibacterial masterbatch includes: 2-6 parts of starch, 1-3 parts of polyvinyl alcohol, 0.1-0.3 parts of nano titanium dioxide, 0.2-0.5 parts of nano silicon dioxide, 0.25-0.5 parts of soluble rare earth salt, 0.05-0.1 parts of silane coupling agent, 1-3 parts of loofah fiber. The new antibacterial packaging bag material of the present application has the advantages of strong antibacterial property, biodegradability, fast degradation rate, good barrier property and excellent preservation effect.

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 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 present invention discloses a recyclable bio-based thermosetting polyurethane hot melt adhesive and its preparation method, which includes vegetable oil polyol, poly(propylene carbonate) diol, polyester polyol, macromolecular thermoplastic tackifying resin, isocyanate, furan compound containing active hydrogen, and bifunctional bismaleimide. First, the present invention reacts vegetable oil polyol, poly(propylene carbonate) diol, polyester polyol, and macromolecular thermoplastic tackifying resin with diisocyanate to generate a polyurethane prepolymer. Subsequently, the furan compound containing active hydrogen is reacted with the above prepolymer. Finally, bifunctional bismaleimide is added to form a dynamic covalent polymer therewith. The prepared bio-based thermosetting polyurethane hot melt adhesive has a low melt viscosity, a high ultimate peel strength, and recyclable characteristics. Some raw materials of the present invention are derived from biomass and renewable materials, which improves the green sustainability of the product's entire life cycle.

The invention discloses a bio-based polyurethane printing ink. Comprising the following raw materials in parts by weight: 10.3 to 22.4 parts of bio-based isocyanate, 25.6 to 34.5 parts of diisocyanate, 40.4 to 52.8 parts of bio-based polyol, 5.7 to 12.4 parts of polypropylene carbonate polyol, 0.5 to 1.2 parts of a catalyst, 3.5 to 9.5 parts of a hydrophilic chain extender, 4.3 to 12.6 parts of an amine chain extender, 2.8 to 6.7 parts of a neutralizing agent, 5.1 to 16.5 parts of water, 6.7 to 18.3 parts of toner, 2 to 5 parts of a thickening agent, 4.2 to 6.8 parts of a curing agent, 2.1 to 4.5 parts of a BYK-425 dispersing agent and 1.5 to 2.3 parts of a TGEO Glide 450 flatting agent. 1.1 to 2.3 parts of polyoxyethylene glycol alkyl ester and 4.7 to 6.2 parts of an antibacterial agent; the invention also discloses a preparation method of the bio-based polyurethane ink. The printing ink is prepared from bio-based isocyanate and bio-based macromolecular polyol through a reaction, has very excellent biocompatibility and biodegradability, and is endowed with an antibacterial function through the antibacterial agent.

The invention provides a CO2 separation membrane with a high permeability coefficient and a preparation method and application thereof.The CO2 separation membrane is prepared from raw materials including polypropylene carbonate and polyadipic acid / butylene terephthalate, and by taking the total weight of the raw materials of the CO2 separation membrane as 100%, the content of polypropylene carbonate accounts for 70-95 wt%, the content of polyadipic acid accounts for 10-20 wt%, and the content of polyadipic acid accounts for 10-20 wt%. The content ratio of the polyadipic acid / butylene terephthalate is 4 to 30 percent. The CO2 permeability coefficient of the separation membrane can reach 35000 Bar (25 DEG C / 0.1 MPa) or above, the CO2 / N2 selectivity is 10-20, and the separation membrane is suitable for purification and separation of high-flow and low-concentration CO2.

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 invention discloses a high molecular weight CO2-based degradable plastic catalyzed by a non-metal catalyst and a preparation method thereof, the preparation method takes propylene oxide (PO) and CO2 as raw materials, in the presence of the non-metal catalyst, a molecular weight regulator and a branching agent, a copolymerization reaction is carried out, and the CO2-based degradable plastic polypropylene carbonate (PPC) is synthesized. The non-metal catalyst is composed of alkyl boron and quaternary ammonium salt, the molecular weight regulator is cyclic anhydride, and the branching agent is cyclic carboxylic acid dianhydride. The PPC prepared by the invention not only is high in molecular weight and good in processability, has the concept of carbon neutralization, relatively high gas barrier property, solvent resistance and the like, has the characteristics of relatively high strength, elastic coefficient, no toxicity, harmlessness and the like, is biodegradable, and has a wide market application prospect.

The invention belongs to the field of polymer chemistry, and relates to a metal complex, a catalytic system and application thereof, and polypropylene carbonate and a preparation method thereof. The structure of the metal complex is as shown in formula (I): # imgabs0 #, wherein M is a trivalent metal ion; y is a monovalent acid radical ion; r1 is a substituted or unsubstituted cycloalkylene group or arylene group of C5-C12; r2 is H or alkyl of C1-C6; and R3 is an alkylene group of C1 to C10. Compared with the prior art, the method has the following advantages that the Salen metal complex with a novel phenothiazine structure is adopted as a main catalyst to efficiently catalyze copolymerization of carbon dioxide and epoxide to prepare the polypropylene carbonate, and the obtained polypropylene carbonate has the characteristics of high molecular weight and narrow molecular weight distribution.

The invention discloses a method for upgrading polyester depolymerization to carboxylic acid ester and boric acid ester by catalyzing ionic liquid, which relates to the comprehensive utilization of waste resources and the cascade utilization of raw materials. The method uses multiple types of green ionic liquid catalysts to catalyze the methanolysis reaction of PET, and then phenylboronic acid captures the generated ethylene glycol in situ, and forms different types of five-membered cyclic boric acid esters through dehydration and cyclization. The products of the method of the invention are carboxylic acid ester and different five-membered cyclic boric acid esters. The invention can be used for the depolymerization and upgrading of waste PET materials, and can also be used for other similar polyesters and polycarbonates, such as polyethylene adipate, polyethylene succinate and polypropylene carbonate, which are also suitable for the recovery strategy of the invention, and the products are corresponding boric acid ester, dimethyl succinate and dimethyl adipate.

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 invention provides an adhesive and a preparation method of low-alloy ultrahigh-strength steel, and the adhesive comprises the following components in percentage by mass: 75-85% of polyformaldehyde, 5-11% of polypropylene carbonate, 2-5% of polylactic acid, 5-6% of stearic acid and 2-4% of ethylene-vinyl acetate copolymer. The optimized combination of the polypropylene carbonate and the polylactic acid in the adhesive has certain shape preserving performance, and can replace a skeleton component in a traditional plastic-based adhesive; the strength of the degreased brown blank can be guaranteed, the thermal decomposition temperature of framework components can be effectively reduced, introduction of impurity elements C and O of a metal matrix is reduced, and the comprehensive mechanical property of a sintered product can be improved. In addition, main decomposition products of polypropylene carbonate are carbon dioxide and cyclic propylene carbonate, and thermal decomposition products of polylactic acid are lactic acid, ethanol, carbon dioxide and water. Polypropylene carbonate and polylactic acid are used as raw materials, thermal decomposition products of polypropylene carbonate and polylactic acid are environment-friendly and are green and environment-friendly materials, polypropylene carbonate and polylactic acid are low in price, the degreasing process is simple, convenient and high in efficiency, and the cost of metal powder injection production can be reduced.

The invention relates to the technical field of sound insulation and noise reduction foam, in particular to a mesoporous ceramic / chlorinated polypropylene carbonate sound insulation microporous foam material and a preparation method thereof, and the foam material is prepared from the following raw materials in parts by mass: 2-20 parts of mesoporous ceramic and 80-98 parts of chlorinated polypropylene carbonate. The mesoporous ceramic / chlorinated polypropylene carbonate foam material has the advantages of being high in strength, low in density, excellent in sound insulation performance, environmentally friendly and the like, the average transmission loss at the medium-high frequency of 1000-6300 Hz can reach 46-51 dB, the compression modulus can reach 38-48 MPa, the compression strength can reach 2.6-3.7 MPa, and the mesoporous ceramic / chlorinated polypropylene carbonate foam material is an excellent novel light sound insulation foam material and has good application prospects. The method can be applied to the fields of rail transit, recording studios, building walls and the like.