1071 results about "Trans esterification" patented technology

The invention discloses industrial-grade mixed oil produced by utilizing kitchen waste oil and a preparation method of the industrial-grade mixed oil, and belongs to the technical field of recycling of the kitchen waste oil. The invention relates to industrial-grade mixed oil produced by using kitchen waste oil and a preparation method thereof, and the preparation method comprises the following steps: firstly collecting kitchen waste containing the waste oil, and storing the kitchen waste in a container through special equipment; carrying out screen solid-liquid separation, cleaning grease on the surface of the solid waste, and then carrying out precipitation separation; then carrying out centrifugal separation, chemical cleaning, water washing, acid treatment, dehydration, degumming and metal ion removal on the separated grease and oil-containing liquid; carrying out ultrasonic-assisted multistage ester exchange after enzymolysis optimization, carrying out membrane separation on glycerol and fatty acid methyl ester, and carrying out reduced pressure distillation to obtain a high-purity fraction; carrying out adsorption refining, plasma treatment and supercritical fluid extraction; finally, nano particles are added and blended with additives, efficient recycling of the kitchen waste oil is achieved, and then high-purity industrial-grade mixed oil is prepared.

The invention relates to a solvent-resistant medical connecting line sheath material and a preparation method thereof, and belongs to the technical field of high polymer materials. The sheath material is prepared from the following components: 38 to 44 weight percent of passivated toughening agent, 1.5 to 1.8 weight percent of heat stabilizer, 0.7 to 0.9 weight percent of lubricant, 0.12 to 0.15 weight percent of antioxidant and the balance of PVC (Polyvinyl Chloride) resin, the passivated toughening agent is prepared by the following steps: carrying out amine ester exchange reaction on 4-hydroxybutylamine and dimethyl difluoromalonate, introducing an alcohol-terminated hydroxyl group, carrying out substitution with dichloromethylvinylsilane to form a fluorine-containing chain compound, and finally carrying out double bond addition on methyl thioglycolate and a side chain; the passivation toughening agent is compatibilized through branched chain methyl ester and dynamically coordinated with a PVC molecular chain through a side chain thioether group, weakens the acting force between PVC chains, plays a good toughening role, inhibits dissolution through physical crosslinking, shields and passivates the PVC molecular chain, and relieves swelling of PVC in a solvent.

The invention relates to a kitchen waste oil recovery treatment method, which comprises: S1, carrying out multi-field synergistic pretreatment: sequentially carrying out ultrasonic wave and high-frequency pulse electric field treatment on waste oil to break an emulsion layer, adding magnetic nanoparticles to adsorb polar impurities, and carrying out magnetic field separation to obtain high-purity oil; s2, supercritical catalytic reaction: under the CO2 supercritical condition, using a core-shell structure composite catalyst to synchronously perform transesterification reaction and glycerol dehydration reaction; s3, dynamic membrane separation: separating biodiesel and glycerol in real time through an intelligent membrane assembly; s4, gradient utilization of energy: recovering reaction waste heat to drive membrane distillation to concentrate wastewater, and using tail gas CO2 for carbonation reaction to generate calcium carbonate. Through four core technologies of multi-field collaborative pretreatment, low-temperature supercritical catalysis, dynamic membrane separation and energy gradient utilization, triple limitations on efficiency, cost and environmental protection in the prior art are remarkably broken through.

The invention discloses a method for preparing regenerated flame-retardant high-shrinkage polyester by a methanol alcoholysis method, and belongs to the technical field of polyester. The method comprises the following steps: (a) mixing the waste polyester fabric with methanol, and carrying out catalytic depolymerization to obtain a regenerated DMT mixed solution; (b) carrying out impurity separation and methanol recovery treatment on the regenerated DMT mixed solution, and then carrying out cooling crystallization, centrifugal drying and rectification purification treatment to obtain pure DMT; (c) carrying out transesterification on pure DMT, ethylene glycol, a transesterification catalyst and a DEG inhibitor; (d) after the ester exchange reaction, adding CEPPA-EG and IPA-EG for copolymerization; adding a polymerization catalyst, a stabilizer and an antioxidant for polymerization reaction to obtain a modified polyester melt; and (e) granulating and drying to obtain the slices. The regenerated polyester prepared by the method has multiple functions of flame retardance, high boiling water shrinkage, low-temperature dyeing and the like, and is suitable for the fields of high-end clothing, automotive trim, electronic packaging materials and the like.

The invention provides a preparation method of mannitol carbonic acid sulfate, mannitol and dimethyl carbonate are used as starting raw materials to prepare mannitol carbonic acid sulfate, a target compound is obtained through ester exchange, cyclization and oxidation reaction, the raw materials are low in price and easy to obtain, the reaction operation is simple and convenient, the yield of the obtained product is 81% or above, the purity is 99.6% or above, and the method is suitable for industrial production. The method is suitable for industrial production.

The present invention relates to the technical field of seawater desalination membranes, and discloses a durable seawater desalination membrane and a preparation method thereof. The present invention uses pentaerythritol as an initiator, uses propylene oxide and ethylene oxide as raw materials to synthesize a hyperbranched polyether, and then undergoes an ester exchange reaction with 2-aminoethyl acetate to synthesize a modified hyperbranched polyether. The ZIF-8 material is then synthesized by a hydrothermal method, and MoS2 nanosheets are coated on its surface to obtain a MoS2 / ZIF-8 composite material, which is then surface-modified by a silane coupling agent to obtain a modified MoS2 / ZIF-8 composite material. Finally, a casting solution is formed using polysulfone and a modified MoS2 / ZIF-8 composite material to obtain a base membrane, and the base membrane is then sequentially immersed in an aqueous phase solution and an oil phase solution to form a polyamide film layer, thereby obtaining a durable seawater desalination membrane. The seawater desalination membrane prepared by the present invention has excellent water flux, desalination rate and durability.

The invention belongs to the technical field of textile auxiliaries, and particularly discloses a multifunctional polyester type high-temperature leveling agent and a preparation method thereof.The leveling agent is prepared from, by mass, 1.5-2.5 parts of ester exchange catalyst, 5-25 parts of polyhydric alcohol, 0.5-1.5 parts of esterification catalyst, 3-40 parts of fatty acid, 15-30 parts of solvent, 20-40 parts of hydrophilic polyether chain segment and 20-40 parts of benzene-containing polyester chain segment. According to the multifunctional polyester type high-temperature leveling agent and the preparation method thereof, the prepared leveling agent has the effects of dispersing and solubilizing a dye, preventing a fabric from being scratched in the washing process, performing hydrophilic soft modification on the surface and the like, and due to the excellent dispersion and solubilization stability of the leveling agent in the full-temperature section, the heating rate can be effectively increased; the production speed is increased, wrinkles and scratches caused in the rapid temperature rising process of the fabric can be effectively prevented, and meanwhile the fabric is endowed with good hydrophilic and soft performance.

The invention discloses a reprocessable solid-solid phase change material based on dynamic borate bonds and a preparation method of the reprocessable solid-solid phase change material. Based on the mechanism that boric acid ester is subjected to ester exchange during thermal stimulation, a dynamic cross-linking agent containing boric acid ester is adopted for cross-linking a polyurethane prepolymer, polyethylene glycol is cross-linked through chemical bonds, the tensile strength and the elongation at break of the phase change material are improved, and the problem that the phase change material is prone to leakage in the phase change process is solved; besides, borate bonds belong to associated dynamic covalent bonds and can keep the crosslinking density of the material unchanged when ester exchange occurs under thermal stimulation, so that the thermal stability of the material is relatively good; the solid-solid phase change material disclosed by the invention is excellent in mechanical property, has a relatively high enthalpy value, can be reprocessed, and has an application prospect in the fields of thermal management, energy storage, infrared stealth and the like.

The invention relates to a preparation method and application of a three-step method environment-friendly SBS modified asphalt regenerant, and the regenerant is composed of modified bio-oil, functionalized desulfurized rubber, a solubilizer, an anti-oxidation aging agent, an anti-light aging agent, a multi-sulfydryl chain reconstruction auxiliary agent, a reversible thioether cross-linking agent and other components. The matrix and polymer network structure of the aged SBS modified asphalt is repaired through light oil supplement and chemical reaction. The preparation method comprises the following steps: introducing a polar functional group into ultrasonic transesterification modified bio-oil to improve wettability; the surface activity of the desulfurized rubber is improved through plasma low-temperature treatment; high-speed shearing and closed-loop control reaction are combined to realize rubber particle dispersion and network reconstruction; chemical crosslinking and aging regeneration are realized through cooperation of specific components. The prepared regenerant is doped into aged SBS modified asphalt at the temperature of 145-165 DEG C according to the proportion of 4-20 wt% to prepare regenerated asphalt.

The invention relates to the technical field of high polymer materials, in particular to a low-warpage PBT / PC composite modified material and a preparation method thereof. The composite material is prepared from the following raw materials: PBT resin, PC resin, a filler, an ester exchange inhibitor, a flexibilizer, a compatilizer, an antioxidant, a lubricant, a flowable agent and glass fibers. The preparation process comprises the steps of resin drying and mixing, additive premixing, melt blending extrusion and the like, is simple and controllable in flow and is suitable for large-scale production. The composite material prepared by the invention has high strength, high toughness, low warping degree and excellent processability, can be used for ultrasonic welding, reduces after-shrinkage of the material, solves the problem of melt cooling film sticking, and meets the requirements of the market on high-precision and high-stability engineering plastics.

The present invention provides a system and a method for preparing a polyester polyol prepolymer. The system comprises an atmospheric pressure bubbling reaction rectifying tower and a reduced pressure heating reaction rectifying tower. The method comprises: introducing a protective gas into an atmospheric pressure bubbling reaction rectifying tower, introducing a raw material for preparing a polyester polyol prepolymer into the atmospheric pressure bubbling reaction rectifying tower, and carrying out a primary esterification reaction or an ester exchange reaction; and introducing the primary esterification product or the ester exchange product into a reduced pressure heating reaction rectifying tower, and carrying out one or more of a deep esterification reaction, an ester exchange reaction, and a pre-polycondensation reaction to obtain the polyester polyol prepolymer. The present invention has the advantages of high reaction efficiency, stable product quality, easiness in product separation, convenience in large-scale production and the like.

The invention belongs to the technical field of polyester polyol, and particularly relates to high-functionality low-viscosity polyester polyol and a step-by-step synthesis method thereof. Comprising the following steps: (1) adding dihydric alcohol, dicarboxylic acid, a catalyst and an antioxidant into a reaction kettle, heating and vacuumizing, and carrying out esterification and ester exchange reaction to prepare a polyester polyol intermediate; and (2) cooling the polyester polyol intermediate prepared in the step (1), adding polyol into the reaction kettle, and continuously carrying out ester exchange reaction to obtain the high-functionality low-viscosity polyester polyol after the reaction is finished. According to the step-by-step synthesis method, the problems that in the prior art, high-functionality polyester polyol is large in viscosity and low-viscosity products are difficult to prepare are solved, the viscosity of the high-functionality polyester polyol can be effectively reduced under the same raw material system and hydroxyl value conditions through specific raw material selection and process control, and the method is simple in process and easy to implement. The industrial production is convenient.

The invention relates to a high-gloss high-glass-fiber-content nylon 66 composite material and a preparation method thereof, and belongs to the technical field of polymer composite materials. The composite material is prepared from the following components in percentage by weight: 50 to 60 percent of alkali-free glass fiber, 2.2 to 3.5 percent of highlight compatibilizer, 3.5 to 5 percent of flexibilizer, 0.15 to 0.2 percent of antioxidant, 0.6 to 0.9 percent of processing aid and the balance of nylon 66 resin, the high-gloss compatibilizer is prepared by the following steps: substituting n-alkyl alcohol and vinyl trichlorosilane to prepare an intermediate 1, initiating addition by methyl mercaptoacetate and unsaturated double bonds of the intermediate 1 to prepare an intermediate 2, and finally performing amine ester exchange on gamma-aminopropyltriethoxysilane and terminal methyl ester of the intermediate 2. The highlight compatibilizer effectively reduces the content of a high crystal region-low crystal region interface in a composite system and reduces scattering of light, so that the composite material keeps higher glossiness.

The invention relates to the technical field of organic synthesis, in particular to a method for homogeneous catalytic synthesis of dimethyl carbonate by using a liquid separation method to separate a catalyst, which comprises the following steps: by using 0.3-15% long-chain tertiary amine as a homogeneous catalyst, carrying out homogeneous reaction on cyclic carbonate and methanol in a mass ratio of 1: (1.2-5.5) at 60-80 DEG C for 4-7 hours. And after the homogeneous transesterification reaction is completed, carrying out atmospheric distillation on the reaction mixture, and collecting fractions to obtain the target product dimethyl carbonate. Carrying out liquid separation on the heterogeneous atmospheric distillation residual liquid, and collecting a lower-layer material to obtain a by-product; and the collected material is a catalyst which can be directly recycled subsequently. The dimethyl carbonate synthesis method provided by the invention has the characteristics of high catalytic efficiency, easy catalyst separation, environmental protection, energy saving and the like.

The invention discloses a full bio-based copolymer based on a citric acid bicyclic monomer, a preparation method and an application, and belongs to the technical field of material synthesis, citric acid-derived bicyclic OPD diol and OPBMC diester are synthesized through oxidation reduction and transesterification, and then 1, 4-butanediol is partially replaced with OPD or 2, 4-butanediol is partially replaced with OPBMC through melt phase polycondensation reaction. Two series of random copolyester PBxOyF copolymer and PBOmFn copolymer of the PBF are prepared by adding 2, 5-dimethyl furandicarboxylate into the PBF, and then adding the PBxOyF copolymer and the PBOmFn copolymer into the PBF. According to the full-bio-based copolymer based on the citric acid bicyclic monomer, the preparation method and the application, the citric acid bicyclic monomer obviously improves the glass transition temperature and shows good mechanical properties; therefore, the bicyclic monomer based on citric acid has huge potential in the aspect of synthesizing novel bio-based copolyester with expected thermodynamic properties, and is expected to further expand the application range of the 2.5 furandicarboxylic acid-based polyester.

The invention relates to the technical field of immobilized lipase, in particular to immobilized lipase taking modified nano SiO2 as a carrier as well as a preparation method and application of the immobilized lipase. The immobilized lipase sold in the market is high in price and poor in mechanical strength, the enzyme loss is too large due to shear force or carrier structure damage in the continuous production process, and the transesterification efficiency is poor. In order to solve the technical problems, the invention provides the immobilized lipase taking the modified nano SiO2 as the carrier, the immobilized lipase is obtained by sequentially grafting a modified nano silicon dioxide carrier with an amino silane coupling agent and an epoxy silane coupling agent and loading lipase on the surface of the modified nano silicon dioxide carrier, according to the method, the immobilized lipase forms an enzyme column in a chromatographic column and then serves as a reactor, damage of mechanical stirring to lipase particles is avoided, the ester exchange degree is more effectively controlled by adjusting the flow speed of a substrate, the production cost of an enterprise can be remarkably reduced, and the product quality is improved.

The invention belongs to the technical field of chemical production, and particularly relates to high-purity dimethyl carbonate and a preparation method thereof. The preparation method comprises the following steps: taking ethylene carbonate and methanol as raw materials, taking an alkali alcohol solution as a catalyst, carrying out transesterification in a rectifying tower to obtain dimethyl carbonate and methanol azeotrope, and extracting the azeotrope from the top of the rectifying tower; separating the dimethyl carbonate and methanol azeotrope by adopting pressurized azeotropic distillation to obtain a dimethyl carbonate crude product; and conveying the dimethyl carbonate crude product into a falling film crystallizer for continuous falling film crystallization, controlling the temperature of low-temperature chilled water in the falling film crystallizer to be-10 to 2 DEG C and the circulating material amount to be 3-5 times of the mass of the product required to be produced, and heating to melt the material to obtain the high-purity dimethyl carbonate product. According to the preparation method provided by the invention, rectification crude purification and continuous falling film crystallization processes are adopted, and dimethyl carbonate with the purity of 99.99% or above is obtained.

The invention relates to a preparation method and system of high-molecular-weight polyethylene glycol oxalate, and the preparation method comprises the following steps: adding oxalic acid diester, ethylene glycol and a first catalyst, and carrying out transesterification to obtain an ester; adding a second catalyst, and carrying out a pre-polycondensation reaction on the esterified product to obtain a glycol oxalate oligomer; polymerizing the ethylene glycol oxalate oligomer, and carrying out final polymerization reaction to obtain polyethylene glycol oxalate; the molar ratio of the oxalic acid diester to the ethylene glycol is (1.05-1.3): 1. Compared with the prior art, by controlling excessive oxalic acid diester in the raw material ratio, namely controlling the molar ratio of oxalic acid diester to ethylene glycol to be greater than 1, the reaction rate of ethylene glycol is improved, self-polycondensation of ethylene glycol is prevented, further increase of molecular weight is facilitated, and meanwhile, the thermal performance of the product is improved.

The invention relates to the technical field of polyester fibers, in particular to a negative ion polyester fiber which is prepared from the following raw materials in percentage by mass: 85-92% of polyethylene glycol terephthalate, 3-8% of nano tourmaline composite powder, 2-5% of a titanium dioxide / graphene composite carrier, 0.5-1.5% of a coupling agent and 0.3-0.8% of an antioxidant. The invention also discloses a preparation method of the composition. According to the invention, the core-shell structure optimization design is adopted, the core layer ensures the high loading capacity of the tourmaline composite powder, the shell layer has the synergistic effect of the titanium dioxide / graphene composite carrier, the negative ion release efficiency is obviously enhanced, the particle size of the nanoscale tourmaline is controlled to be 50-100nm, the nanoscale tourmaline is uniformly dispersed, the nanoscale tourmaline and graphene form a heterojunction structure, and the electron transmission capability is greatly improved; the negative ion release amount meets the JIS standard, a chemical bonding interface is formed through transesterification, the structural stability is enhanced, and the retention rate of the negative ion release performance is still high even after multiple times of washing.

The invention provides a polycarbonate-polysiloxane copolymer as well as a preparation method and application thereof, and belongs to the technical field of polycarbonate material preparation. The polycarbonate-polyorganosiloxane copolymer comprises a polycarbonate block and a polyorganosiloxane block, and the polycarbonate-polyorganosiloxane copolymer comprises a polycarbonate block and a polyorganosiloxane block. A high-boiling-point solvent capable of simultaneously dissolving polysiloxane and polycarbonate is added, and a high-boiling-point cosolvent capable of improving intersolubility of polysiloxane and other monomers (an aromatic bisphenol compound and / or an aliphatic diol compound and diester carbonate) is introduced into a melt transesterification polycondensation method; in the ester exchange stage, the intersolubility of reaction monomers is improved, the conversion rate of polysiloxane is improved, and the transparency and molecular weight of the copolymer are improved.

The invention belongs to the technical field of polyester master batches, and particularly relates to a damp-heat-resistant ultraviolet barrier polyester master batch and a preparation method thereof. The invention discloses an anti-ultraviolet polyethylene glycol terephthalate composite material, which is prepared from the following raw materials in parts by weight: 85 to 90 parts of polyethylene glycol terephthalate, 10 to 15 parts of anti-ultraviolet agent, 3 to 5 parts of epoxy-terminated polyether and 1 to 3 parts of lubricant, wherein the anti-ultraviolet agent is a modified intermediate obtained by modifying a nano light screening agent by a carboxylic ester coupling agent according to a mass ratio of (3 to 5): 100; the modified intermediate and a hydroxybenzophenone derivative are subjected to a grafting reaction according to the mass ratio of 100: (5-8); the nano light screening agent is selected from one or a combination of two or more of nano zinc oxide, nano titanium dioxide, nano cerium oxide, nano tin antimony oxide and nano carbon black. The dispersion effect of the anti-ultraviolet agent in the master batch is improved, and the ultraviolet barrier and the light transmittance are improved; meanwhile, the anti-ultraviolet agent is subjected to ester exchange with PET in the screw extrusion process, so that the interaction with PET is enhanced, migration in a humid and hot environment is avoided, and the ultraviolet shielding performance is lasting and stable.

The invention relates to the field of chemical synthesis, in particular to a production process of allyl diethylene glycol dicarbonate, which comprises the following steps: by taking allyl alcohol and dimethyl carbonate as raw materials, carrying out transesterification under the action of a core-shell catalyst to generate dipropylene carbonate; carrying out solid-liquid separation, carrying out reduced pressure distillation to recover methanol and dimethyl carbonate, and then carrying out second-step ester exchange reaction with diethylene glycol under the action of the same catalyst to generate allyl diethylene glycol dicarbonate; and finally, performing multi-stage reduced pressure distillation purification to obtain a high-purity product. According to the core-shell type catalyst, an MCM-41 molecular sieve is used as a carrier, an inner core is formed after amino modification and zirconium ion coordination, then an interface layer and a phenyl modified silicon dioxide shell are used for packaging, and the core-shell type catalyst has high activity, high selectivity and excellent structural stability. The method has the advantages of mild process conditions, recyclable catalyst, high product yield and excellent purity, and is suitable for industrial production.

The invention relates to the technical field of polymer dye synthesis, in particular to a polymer coloring agent based on a binary acid chromophoric monomer, a color master batch, a fiber and a preparation method of the polymer coloring agent. The structural formula of the diacid chromophoric monomer is as follows: # imgabs0. The chromophoric monomer has extremely high thermal stability, and can maintain the chemical structural integrity and chromophoric performance in a high-temperature environment (250 DEG C). The heat-resistant characteristic is mainly derived from a highly stable aromatic skeleton formed by a parent nucleus through an expanded conjugated system and a rigid plane structure, and heat vibration energy is effectively dispersed; in addition, a thermal stable group (an all-carbon skeleton) is introduced through side chain modification to form a steric hindrance effect, and molecular movement at high temperature is inhibited. Due to the unique heat resistance of the monomer, the monomer can be completely matched with a high-temperature processing window (240-300 DEG C) of a polyester melt polymerization process, and a polymer-dye composite system with a stable structure is constructed through covalent bonding in ester exchange and polycondensation processes.

The invention provides a synthesis method of 3, 9-diazaspiro [5.5] undecane-3-tert-butyl formate, which comprises the following steps: carrying out witting reaction on N-Boc-4-piperidone and trimethyl phosphonoacetate to obtain an intermediate 1, carrying out addition reaction on the intermediate 1 and acetonitrile to obtain an intermediate 2, and carrying out hydrogenation reduction and amine ester exchange reaction on the intermediate 2 to obtain 3, 9-diazaspiro [5.5] undecane-3-tert-butyl formate. And carrying out a reduction reaction on the intermediate 3 to obtain the 3, 9-diazaspiro [5.5] undecane-3-tert-butyl formate. The whole method is short in route, mild in reaction condition, high in product purity and yield and suitable for industrial production.

The invention discloses isosorbide type block copolycarbonate as well as a preparation method and application thereof, and belongs to the technical field of organic polymer materials. The problems that isosorbide polycarbonate in the prior art is low in molecular weight, deep in color and luster, fragile in material and the like are solved. The preparation method comprises the following steps: carrying out melt ester exchange polycondensation reaction on dihydric alcohol and isosorbide carbonate serving as raw materials to obtain dihydroxyl-terminated isosorbide ester glycol; rigid amorphous dihydroxyl-terminated isosorbide ester glycol and oligomeric flexible chain dihydric alcohol are connected together, and a molecular chain is reformed, arranged and branched to a certain extent, so that the isosorbide type block copolycarbonate is effectively synthesized. According to the method, the oligomeric flexible chain dihydric alcohol can be effectively introduced to improve the molecular weight and the mechanical property of the isosorbide polycarbonate, so that the problems that the isosorbide polycarbonate is too strong in structural rigidity, fragile in material, deep in color and the like in production and application are solved.

The invention discloses a method for preparing a functionalized polymer based on a macro-micro reactor chemical-enzyme method, which comprises the following steps: reacting a mixed solution of an acrylate monomer, an initiator, a ligand, a functional alcohol and a solvent in a micro reactor to obtain a reaction solution containing functionalized polyacrylate, and the micro reactor comprises the macro-micro reactor containing a copper internal member. In a macro-micro reactor, enzymatic ester exchange and Cu (0)-RDRP coupling reaction are carried out to obtain poly (methyl) acrylate with a series of chemical structures and copolymers of the poly (methyl) acrylate. The method is wide in applicable substrate range, and compared with a traditional synthesis method, the macro-micro reactor containing the internal component can remarkably shorten the polymerization time, secondary purification of the monomer is avoided, and the conversion rate is greatly increased. The characteristic scale of the macro-micro reactor reaches centimeter level, and high-flux synthesis can be realized. The invention provides a technical scheme for the preparation of the functionalized poly (methyl) acrylate polymer, and has an industrial conversion prospect.

The invention relates to the field of polyurethane, and discloses a preparation method of a linear reaction type phosphorus-nitrogen-silicon synergistic flame-retardant solvent-free polyurethane coating, which comprises the following steps: S1, carrying out exchange reaction on phosphonate and alcohol amine ester to obtain a phosphorus-nitrogen polyol intermediate; s2, carrying out condensation polymerization on the phosphorus-nitrogen polyol intermediate and chlorosilane to obtain phosphorus-nitrogen-silicon polyol; s3, mixing polyester / polyether polyol, a chain extender and an amine / metal catalyst to obtain a component A; mixing and reacting isocyanate, part of polyester / polyether polyol and phosphorus-nitrogen-silicon polyol to obtain a component B; mixing the component A and the component B, spraying the mixture on release paper, and curing. Through a synergistic flame-retardant mechanism of phosphorus, nitrogen and silicon, the balance of efficient flame retardance, mechanical properties and excellent coating properties is realized. The solvent-free system realizes zero emission of volatile organic compounds, and the linear reaction type design ensures that the mechanical properties and durability of the coating are not influenced.

The invention belongs to the technical field of food and chemical industry, and particularly relates to a gas-liquid-solid three-phase fluidized bed enzyme reactor and a synchronous preparation method of grease enzyme method deacidification and diglyceride by using the same. According to the method, the gas phase of the three-phase fluidized bed is high-purity dry inert gas, the liquid phase is a uniform solution formed by mixing reaction substrate high-acid-value oil and an acyl acceptor, and the solid phase is immobilized enzyme. The method comprises the following steps: mixing high-acid-value oil and an acyl acceptor to prepare a raw material solution, preheating a feeding tank to a reaction temperature, adding the raw material solution into a gas-liquid-solid three-phase fluidized bed reactor, and carrying out esterification and / or transesterification under the bubbling action of inert gas to realize the deacidification of the high-acid-value oil and the synchronous preparation of the functional lipid. The mixture of the deacidified grease and the functional lipid is obtained. The method has the characteristics of high catalytic efficiency, easiness in separation of the product from enzyme, high nutritional value of the product, no need of adding an organic solvent, difficulty in oxidation of grease and suitability for large-scale production.

The invention relates to a method for identifying kitchen waste grease, which comprises the following steps: by taking cis-9-tetradecenoic acid as a detection object, converting triglyceride in the grease into corresponding fatty acid low-carbon alcohol ester through a transesterification method, and detecting and calculating the content of the cis-9-tetradecenoic acid so as to judge whether the kitchen waste grease is contained or not. The identification method provided by the invention is simple in pretreatment operation and high in identification speed; and 2) the target cis-9-tetradecenoic acid in the identification method provided by the invention is a similar compound of a main component in the vegetable oil and is not easy to remove in a refining process, so that the accuracy is high, and a false negative result can be avoided.

The invention belongs to the technical field of polymer composite materials, and particularly relates to a polycarbonate modified composite material as well as a preparation method and application thereof, and the polycarbonate modified composite material comprises 60-85 parts of a PC base material, 10-30 parts of a bio-based monomer, 1-8 parts of surface modified nano cellulose and 0.1-2 parts of a transesterification catalyst. According to the polycarbonate modified composite material as well as the preparation method and the application thereof provided by the invention, chemical bonding of a bio-based monomer and a PC main chain is realized through transesterification, phase separation is avoided, and the core pain point of traditional blending modification is solved; the biodegradation rate is increased by 30% or above compared with pure PC, and meanwhile, the excellent mechanical properties (the tensile strength is larger than or equal to 60 MPa, and the notch impact strength is larger than or equal to 5 kJ / m) of PC are reserved; the melt flow rate is increased by more than 25%, the processing energy consumption is reduced, and the application scene is widened; the carboxylic acid modified nano cellulose and the block copolymer form a synergistic network, so that the mechanical property, the thermal stability and the degradation uniformity are synchronously improved.