1222 results about "Carbon chain" patented technology

The invention belongs to the technical field of flame retardants, and particularly relates to a high-thermal-stability polyphosphate flame retardant and a preparation method thereof. The DOPO is modified through the polyethylene glycol acrylate, methyl methacrylate and dicumyl peroxide composite solution, double bonds of the polyethylene glycol acrylate and P-H bonds of the DOPO can be subjected to nucleophilic addition to form stable C-P bonds, and thermal migration of the DOPO is hindered; dOPO has polymerization double bonds of methyl methacrylate and long carbon chains of polyethylene glycol acrylate, so that the compatibility of the polyphosphate flame retardant and a polymer substrate is improved, and phase separation is avoided; maleic anhydride grafted silicone oil is connected to the surface of an amino modified gamma-cyclodextrin-modified DOPO inclusion compound, so that the polyphosphate flame retardant has high thermal stability and high compatibility after long-chain alkyl modification; amino groups in the modified gamma-cyclodextrin react with maleic anhydride grafted silicone oil to generate an amido bond cross-linked network, so that the thermal migration of DOPO is reduced together, and the high thermal stability of the polyphosphate flame retardant is improved.

The invention discloses a synthesis method of amphiphilic quantum dots and application of the amphiphilic quantum dots in nano oil displacement, and belongs to the field of nano oil displacement. The synthesis method comprises the following steps: heating a mixture containing a carbon source and a nitrogen source in an air atmosphere for reaction, and centrifuging, filtering and drying a reaction product to obtain the amphiphilic quantum dots, the carbon source is selected from at least one of glucose, mannose, citric acid, lignin, chitosan and starch; the nitrogen source is selected from at least one of alkylamine, and the carbon chain length of the alkylamine is C6 to C12. The synthesis method is simple, heating of a high-pressure reaction kettle is not needed, the technological process is simple, and the method is suitable for large-scale industrial production; the series of amphiphilic carbon quantum dots show better solubility and higher absolute fluorescence quantum yield in water and various organic solvents.

The invention relates to a production workshop carbon flow twinborn mapping method, and belongs to the technical field of carbon emission optimization. The method comprises the steps of collecting production workshop data in real time to perform multi-modal data fusion; constructing a carbon flow dynamic accounting mechanism model, and calculating the real-time carbon emission intensity of the process; constructing a carbon flow intensity tensor model, extracting multi-granularity carbon flow features based on the carbon flow intensity tensor model, and realizing real-time digital twinborn deduction of carbon flow propagation by using an intelligent prediction algorithm; establishing a differential equation to describe double-flow real-time interaction of the carbon flow and the value flow, constructing a carbon value incidence matrix, and performing carbon flow value analysis; and on the basis of the carbon value incidence matrix, a space-time carbon chain-oriented cooperative adjustment strategy is dynamically generated through a multi-objective optimization algorithm, a double-layer topological optimization model is constructed, and a closed-loop feedback mechanism is introduced to drive the economic sustainability of the control strategy in an industrial environment. The workshop carbon footprint can be displayed in real time, the workshop carbon emission condition can be truly reflected, and the carbon emission data can be analyzed and optimized in time.

The invention relates to a polyethylene and silica gel mixed material, a preparation method thereof and application of the polyethylene and silica gel mixed material in a composite optical cable silicon core tube. The composite material comprises the following components in parts by weight: high-density polyethylene, an ethylene-siloxane copolymer elastomer, a maleic anhydride grafted polyolefin elastomer, hydroxylated nano silicon dioxide, liquid paraffin, a crystallization nucleating agent, an ultraviolet light absorber, an auxiliary stabilizer, a processing aid and color master batch. The liquid paraffin is formed by blending dual-molecular-weight paraffin with different carbon chain lengths, and part of the liquid paraffin is grafted and modified by polybutylene so as to enhance the anchoring capacity of the lubricating phase; in addition, nano cellulose crystals grafted by a PEG-PCL (Polyethylene Glycol-Polycaprolactone) block copolymer are introduced, so that the dimensional stability and the interface structure integrity of the material are synergistically enhanced. The composite material has excellent low friction, thermal oxidation stability, creep resistance and ultraviolet aging resistance, and is suitable for preparation of a high-performance composite optical cable silicon core tube.

The invention provides an active carrier, a supported metallocene catalyst, a preparation method and application. The invention relates to an active carrier, which is used for loading a metallocene compound to form a loaded metallocene catalyst, and comprises a carrier body and an ether-modified aluminoxane compound loaded on the carrier body, the ether-modified aluminoxane compound is modified with at least one of an alkyl ether having an alkyl carbon chain having 10 or more carbon atoms and a crown ether. The aluminoxane compound is modified by ether, so that the usage amount of the aluminoxane compound when the active carrier is used for preparing the supported metallocene catalyst can be reduced, the preparation cost of the supported metallocene catalyst is further reduced, and the supported metallocene catalyst can maintain relatively high catalytic activity.

The invention relates to a (methyl) acrylate monomer as well as a preparation method and application thereof, the structural general formula of the (methyl) acrylate monomer is as follows: # imgabs0 #, n is an integer of 1-20, and R1 is methyl or hydrogen; r2 and R3 are selected from hydrogen, Br, phenyl, methyl or # imgabs 1 #, wherein A1 in the # imgabs 2 # is phenyl or methyl. According to the (methyl) acrylate monomer provided by the invention, the molecular size of the whole monomer is relatively small, the whole monomer has a plurality of branched chain structures, the carbon chain length of a main chain is controllable, and the (methyl) acrylate monomer has high refractive index and good intermiscibility with other components.

The invention belongs to the technical field of perovskite solar cells, and provides a dibenzofuranyl carbazole derivative and a preparation method and application thereof.The dibenzofuranyl carbazole derivative takes dibenzofuranyl carbazole as a functional group, molecular ordered accumulation is optimized, and hole mobility is remarkably improved; an alkyl carbon chain is used as a linking group, a phosphate group at the tail end is an anchoring group, perovskite interface defects can be effectively passivated, the energy loss at the interface can be reduced, single molecule self-assembly can be realized, the cell performance can be improved, and as a self-assembly monomolecular layer hole transport material, a perovskite solar cell has relatively high photoelectric conversion efficiency, and the photoelectric conversion efficiency can be improved. The service life is long; and the stability is high.

IR-sensitive lithographic printing plate precursors provide a stable print-out image using a unique IR radiation-sensitive composition in an infrared radiation-sensitive image-recording layer. This IR radiation-sensitive composition includes: (1) a free radical initiator composition that comprises an electron-donating agent; (2) a free radically polymerizable composition; and (3) a color-changing compound that is represented by the Structure (I) having a conjugated carbon chain between the aromatic terminal groups. The compound also has a —SO2—R3 group wherein R3 represents alkyl, aryl or heteroaryl groups. After IR imaging, these precursors exhibit desirable printout images both fresh and after dark storage. The precursors can be developed off-press or on-press.

The invention discloses an acid liquid system based on synergistic interaction of a corrosion inhibitor and an iron stabilizer and a preparation method, and relates to the technical field of oilfield chemistry, the acid liquid system comprises the following components by mass: 10%-20% of an acid liquid, 0.5%-3% of a composite corrosion inhibitor, 0.5%-2% of an iron stabilizer, 0.1%-0.5% of a discharge aiding agent, 0.2%-0.8% of an acid thickening agent, and the balance of water; the main component of the composite corrosion inhibitor in the acid liquid system is long-chain alkyl bis-imidazoline-thiadiazole amide hydroxypropyl sulfobetaine, and the composite corrosion inhibitor contains a bis-imidazoline ring and a thiadiazole amide ring, and can form more stable multi-active-site adsorption on the metal surface to form a compact and stable protective film, so that the metal surface corrosion resistance is improved, and the metal surface corrosion resistance is improved. Long carbon chains in molecules can effectively block corrosive media, N, O and S heteroatoms in the molecules are adsorbed on the iron surface through lone pair electrons to inhibit corrosion, the slow-release effect is further enhanced, and therefore the slow-release efficiency is improved by 40% or above.

The invention relates to the field of polyurethane film materials for batteries, and discloses a TPU composite material for a new energy battery and a preparation method of the TPU composite material. A TPU composite material for a new energy battery is composed of a cloth film layer, an adhesive film layer and a TPU film layer, the TPU film layer is prepared by melting and casting TPU hot melt adhesive, and the TPU hot melt adhesive is prepared from the following raw materials in parts by weight: 60-80 parts of polyurethane elastomer, 20-30 parts of a toughening aid, 15-25 parts of a flame retardant, 8-15 parts of a heat conducting agent, 2-4 parts of a lubricant and 1-3 parts of an antioxidant; the toughening auxiliary agent is prepared from a POE (Polyolefin Elastomer), long carbon chain alkyl glycidyl ether, dibutyl itaconate and a vinyl dimethyl terminated dimethyl-methyl trifluoropropyl polysiloxane copolymer. The TPU composite material disclosed by the invention is applied to a new energy battery, has relatively good buffering and damping effects and puncture resistance, and is good in flame retardance and thermal conductivity.

The invention discloses a polycarbonate / styrene composite material as well as a preparation method and application thereof, and belongs to the field of high polymer materials. The composite material is prepared from the following raw materials: polycarbonate, silicon copolymerized polycarbonate, styrene resin, a halogen-free flame retardant, a polynitroxide free radical compound, an anti-dripping agent, an antioxidant and a lubricant. The molecular structure of the multi-nitroxide free radical compound contains at least two nitroxide free radicals, and the molecular chain of the multi-nitroxide free radical compound has a flexible carbon chain structure. The polycarbonate / styrene composite material provided by the invention can realize 0.5-1.0 mm ultrathin halogen-free flame retardance under the combined action of the halogen-free flame retardant and the multi-nitroxide free radical compound, and can meet the molding of ultrathin parts, and the prepared product has excellent damp-heat aging resistance and weather resistance, and is suitable for industrial production. The shell can be widely applied to new energy battery shells, power bank shells and the like.

The invention provides a semi-aromatic polyamide material easy to process and form and a preparation method thereof. Comprising the following components in parts by weight: 40-78 parts of PA MXD6, 4-15 parts of long carbon chain nylon, 0.3-3 parts of polyethyleneimine, 20-60 parts of a reinforcing material, 0.2-5 parts of other auxiliaries and 0-50 parts of a filling material. The long carbon chain nylon with a specific length and the polyethyleneimine with a specific molecular weight are fully utilized to be matched, so that more shear sensitivity characteristics are obtained, and the problems of poor flowability of the aromatic ring nylon PA MXD6 material, lack of glue in thin-wall multi-cavity processing, tape casting, scorching, appearance fiber floating and the like are solved.

Disclosed in the present invention are a branched-chain-containing long-carbon-chain polyester elastomer based on biomass-based 2,5-furandicarboxylic acid, and a preparation method therefor. Monomers for preparing the polyester elastomer comprise 2,5-furandicarboxylic acid or 2,5-furandicarboxylic acid ester, a dihydric alcohol and a branched-chain-containing long-carbon-chain dibasic acid. The preparation method comprises: (1) performing a melting reaction on furandicarboxylic acid or an ester thereof, a branched-chain-containing long-carbon-chain dibasic acid and a dihydric alcohol to prepare an oligomer; and (2) performing melt polycondensation on the oligomer to synthesize a furandicarboxylic acid-based branched-chain-containing long-carbon-chain polyester elastomer. By means of the branched-chain-containing long-carbon-chain polyester elastomer of the present invention, the molecular structure can be effectively designed, and the molecular weight can be regulated, thereby optimizing mechanical properties, thermal properties, barrier properties, etc. The preparation process thereof is simple, convenient and safe, and the equipment requirements and catalysis cost are relatively low. The raw material 2,5-furandicarboxylic acid used in the present invention is a potential substitute for terephthalic acid, is derived from biomass, has a wide range of sources and is environmentally friendly.

The invention discloses a fullerene pyrrolidine derivative as well as a preparation method and application thereof, and relates to the field of photoelectric functional materials. The structural general formula of the fullerene pyrrolidine derivative is # imgabs0, and fullerene, amino acids with different carbon chain lengths and aromatic aldehyde are subjected to Prato reaction to generate the fullerene pyrrolidine derivative. The fullerene pyrrolidine derivative provided by the invention is used as an electron transport layer material, can significantly improve the performance of a photoelectric device, has excellent chemical stability and environmental adaptability, and greatly enhances the stability of the device. In addition, the preparation method of the fullerene pyrrolidine derivative is simple, convenient and efficient, the operation condition is mild, and the manufacturing cost of a device is reduced.

The invention relates to an optical monomer and a preparation method and application thereof, the structural general formula of the optical monomer is shown as G1, G2, G3 and G4, R1 and R2 are respectively selected from one of H, C1-C10 alkyl and halogen, A1 is C1-C10 alkyl, R3 is hydrogen or methyl, and n is a positive integer selected from 1-10. The optical monomer provided by the invention has a (methyl) acrylate group with high refractive index and low volume shrinkage property, contains a plurality of aromatic rings with high molar refractive index and low molar volume, and also has sulfur atoms with relatively high molar refractive index, so that the whole molecule of the whole monomer has extremely high refractive index. The whole monomer structure in the invention has at least two functionalities, and can realize fast reaction; the monomer structure also contains more branched chains and carbon chains, and molecules are not easy to agglomerate and have a certain migration rate.

The invention discloses a graphene antistatic PC composite material and a preparation method thereof, and belongs to the technical field of composite materials. 150-160 parts of polycarbonate resin, 10-20 parts of modified graphene, 2-5 parts of light stabilizer, 2-5 parts of ultraviolet absorber, and 2-5 parts of lubricant are weighed by weight and added to a high-speed mixer, and sent into a twin-screw extruder after mixing evenly, and after melt extrusion, cooled and pelletized to obtain a graphene antistatic PC composite material. The modified graphene contains graphene, quaternary ammonium salt structure and hindered phenol structure, and the modified graphene contains lipophilic benzene ring and long carbon chain, so the modified graphene has good compatibility with the polycarbonate resin containing benzene ring and other raw materials, and the modified graphene can be evenly dispersed in the composite material, and is not easy to agglomerate, so that the modified graphene can give full play to the effect, giving the composite material excellent antistatic, antibacterial and anti-aging properties.

The invention discloses a three-dimensional conductive network carboxymethyl cellulose composite binder and a preparation method thereof, and belongs to the technical field of lithium ion batteries, the three-dimensional conductive network carboxymethyl cellulose composite binder is prepared by grafting carboxymethyl cellulose with an acrylamide monomer and a pyrenyl monomer and then compounding with a conductive material. An acrylamide monomer and a pyrenyl monomer copolymerized long chain are grafted on a main chain of carboxymethyl cellulose, pyrenyl in a double-site pyrenyl monomer and a conjugated structure of a conductive material can attract each other through pi-pi accumulation, and the solubility of the pyrenyl monomer is improved by an alkenyl-terminated long carbon chain; a chemical cross-linked network structure can be formed between side chains through double sites, an amide group and carboxyl on carboxymethyl cellulose can attract a silicon negative electrode through hydrogen bonds, the cohesiveness is improved, the capacity of coping with the volume expansion problem of silicon particles is improved through a three-dimensional conductive network structure, and the cycle performance of the battery is remarkably improved.

The invention discloses an interface corrosion resistant aqueous electrolyte and a battery application thereof. The aqueous electrolyte comprises a zwitterionic additive; the zwitterionic additive comprises an imidazolium cation part and a sulfonate anion part; wherein a 1-site N atom in imidazolium is connected with a sulfonate radical through a C1-6 saturated alkyl carbon chain, and a 3-site N atom in imidazolium is connected with a C2-4 unsaturated alkyl carbon chain or a C1-4 saturated alkyl carbon chain. The aqueous electrolyte can effectively relieve the interface corrosion problem of the aqueous battery, so that the cycle stability of the negative electrode is improved, and the preparation of the long-cycle aqueous battery is realized.

The invention discloses a building industry multi-subject collaborative full life cycle carbon emission management system and method, and relates to the technical field of building industry carbon emission management. The system comprises a carbon perception and data collaboration module, a carbon simulation and deduction module, a carbon optimization and collaborative regulation and control module, a carbon accounting and auditing traceability module and a carbon decision and knowledge generation module. Multi-source heterogeneous data is converted into a carbon flow unit with time, space and responsibility subject attributes, data checking, locking and compliance sharing are achieved by means of a multi-subject data collaboration pool, carbon data barriers among all responsibility subjects are broken through, the problems of fragmentization of carbon data collection and lack of collaboration are solved, and the data collection efficiency is improved. And meanwhile, the carbon accounting and audit traceability module completes multi-dimensional accounting based on the carbon flow unit, and establishes a digital carbon chain pointing to an original data source and a responsibility subject, so that full-link traceability of carbon emission data is realized.

The invention belongs to the field of heat conduction materials, and particularly relates to gradient interface modified aluminum oxide-aluminum nitride bi-component heat conduction filler and a preparation method thereof, and the gradient interface modified aluminum oxide-aluminum nitride bi-component heat conduction filler comprises spherical aluminum oxide, flaky aluminum nitride and double gradient modified layers coating the surfaces of the spherical aluminum oxide and the flaky aluminum nitride; the D50 of the spherical aluminum oxide is 2-5 microns, and the sphericity is greater than or equal to 0.85; the sheet-shaped aluminum nitride is in a hexagonal sheet shape, the average particle size is 8-12 microns, the thickness is 200-500 nanometers, and the radius-thickness ratio is 20-50; the mass ratio of the spherical aluminum oxide to the flaky aluminum nitride is (40-70): (30-60); the double-layer gradient modification layer comprises an inner-layer hydrophobic silane layer and an outer-layer reactive silane layer, the inner-layer hydrophobic silane layer is formed by grafting alkyl trialkoxy silane with the carbon chain length of 8-16, the outer-layer reactive silane layer is formed by grafting a silane coupling agent containing an epoxy group or an amino group, and morphological complementary optimization of a filler network is achieved.

The invention relates to the field of water treatment, in particular to a composite material with polyfunctional groups and a preparation method and application thereof.The composite material with the polyfunctional groups contains at least two groups including carboxyl, amino, amido and hydroxyl and at least one group including sulfo and nitro; the composite material contains a cross-linked compound of a polymer I and a polymer II, and the polymer I is a carbon chain polymer and contains at least one group including a sulfonic acid group and a nitro group; and the polymer II is at least one of chitosan and a derivative thereof, and chitin and a derivative thereof. The composite material with multiple functional groups is preferably a composite fiber, has a synergistic adsorption effect of multiple functional groups, can effectively adsorb a complex heavy metal ion system in a water body, and is a heavy metal ion adsorbent which is high in adsorption efficiency, large in adsorption quantity and wide in applicable temperature range.

The invention relates to the technical field of finishing agents, and discloses a fluoride-free leather water-repellent finishing agent and a preparation process thereof. The preparation method comprises the following steps: reacting hydrogen-containing silicone oil, N-methylallylamino hydroxypropyl alkane and a bromoalkane monomer to obtain hydroxyl quaternary ammonium salt silicone oil; the fluorine-free leather water-repellent finishing agent contains hydrophobic silicone oil and a plurality of alkyl long carbon chains, and the hydrophobic silicone oil and the alkyl long carbon chains are introduced into a polyurethane molecular chain through a polymerization chain extension reaction, so that the hydrophobic and water-repellent properties of the polyurethane finishing agent and the leather are remarkably improved, and the water-repellent property of the leather is improved. And the hydroxyl quaternary ammonium salt silicone oil contains an organosilane quaternary ammonium salt antibacterial group which is introduced into a polyurethane molecular chain, so that the finishing agent and the leather are endowed with excellent antibacterial performance.

The invention discloses a preparation method of a catalyst for hydrogenation of CO2 to sustainable aviation fuel (SAF). The catalyst stabilizes FeCx active sites through carbon species, and comprises the following steps: (a) carbon nanotubes, activated carbon, glucose or polyol are used as a carbon source, (b) FeMn, FeZn or FeGa are used as active sites, and (c) alkali metal Li, Na or K is used as an auxiliary agent to promote adsorption of CO2. According to the catalyst, active metal is deposited on carbon species through a coprecipitation method, and the catalyst prepared through the synthesis method not only can weaken oxidation of H2O on FeCx active sites, but also is beneficial to increase of carbon chains to promote CO2 hydrogenation to generate aviation fuel with high selectivity. The invention discloses a preparation method of a high-stability Fe-based catalyst for hydrogenation of CO2 to SAF.

The invention provides a multi-characteristic iron-carbon derivative material for adsorbing and repairing PFAS pollution of a water body as well as a preparation method and application of the multi-characteristic iron-carbon derivative material. The preparation method comprises the following steps: 1, dissolving a ferric salt in N, N-dimethylformamide, adding a ligand terephthalic acid under a stirring condition, and synthesizing a precursor through a solvothermal method; and 2, carrying out heat treatment on the precursor in an inert atmosphere to obtain the multi-characteristic iron-carbon derivative material. The application of the multi-characteristic iron-carbon derivative material in the aspect of environmental restoration comprises the following steps: by taking the multi-characteristic iron-carbon derivative material as an adsorbent, carrying out adsorption purification treatment on a PFAS polluted water body under the assistance of a cationic complexing agent. The multi-characteristic iron-carbon derivative material is synthesized through a solvothermal-thermal treatment two-step method, so that the multi-characteristic iron-carbon derivative material has high hydrophobicity, a two-dimensional-three-dimensional tight interface and magnetism, can quickly remove PFAS with various different structures and carbon chain lengths, can realize material separation within 30 seconds after the PFAS is removed through adsorption, and does not generate secondary pollution.

The invention discloses a Ce-MOF derived multi-metal oxide / ZSM-5-based composite catalyst as well as a preparation method and application thereof, and belongs to the technical field of aviation kerosene preparation. The H-ZSM-5 molecular sieve is synthesized by adopting a hydrothermal method, and Ce-MOF is grown on the surface of the H-ZSM-5 molecular sieve in situ. The high specific surface area, developed pore structure and abundant unsaturated sites of the Ce-MOF material are utilized to realize efficient loading of various active metals. And drying and calcining to obtain the Ce-MOF derived multi-metal oxide / ZSM-5 composite catalyst with a stable structure. Rich oxygen vacancies and active sites can efficiently activate CO2 molecules and promote the hydrogenation process of the CO2 molecules and H2 to generate a key methanol intermediate; accurate carbon chain growth regulation coupling effect can be performed on the methanol intermediate, and the methanol intermediate is quickly and effectively converted. The catalyst prepared by the method provided by the invention has a regular pore structure and suitable acidic sites, and on the basis of the cage control shape selective catalysis principle of the H-ZSM-5 molecular sieve, the per-pass conversion rate of CO2 exceeds 25%, the selectivity of aviation kerosene components in hydrocarbon products reaches 70.5%, and the generation of methane by-products is effectively inhibited.

The invention relates to the technical field of coatings, in particular to multifunctional water-based paint for an engine and a preparation method of the multifunctional water-based paint. In order to reduce the emission of VOCs in the preparation process of an engine coating, the multifunctional water-based paint for the engine is prepared; according to the invention, the diol compound containing fluorine element and benzene ring is firstly prepared, and the fluorine element can effectively reduce the surface energy of a coating formed after the paint is dried and shows a hydrophobic characteristic, so that the phenomena of corrosion and the like caused by external water vapor to an engine can be effectively avoided, and the service life of the engine is prolonged. Moreover, the high electronegativity of the fluorine element can influence the carbon chain of the coating, so that the carbon chain is tightly arranged, and the corrosion of water vapor, acid and alkali can be more effectively prevented; and after mixing with dihydric alcohol, reacting with an isocyanate monomer, a chain extender and the like again, and finally preparing the multifunctional water-based paint for the engine through reaction.

The invention relates to a high-toughness low-melting-point nylon resin and a preparation method and application thereof, the high-toughness low-melting-point nylon resin is mainly prepared from the following components: long carbon chain binary acid, long carbon chain diamine, ether bond-containing amino acid, a catalyst and an end-capping reagent, and water is used as a reaction medium. The preparation method comprises the following steps: (1) adding long-carbon-chain dibasic acid, long-carbon-chain diamine and water into a reaction kettle, and stirring at room temperature to form salt; and (2) adding amino acid containing ether bonds, a catalyst and an end-capping reagent, replacing air in the reaction kettle with inert gas, introducing the inert gas, carrying out condensation polymerization reaction, introducing the inert gas, and discharging to obtain the product. The high-toughness low-melting-point nylon resin is applied to the technical field of automobile oil pipes, water pipes or energy storage equipment hoses. The high-toughness low-melting-point nylon resin is high in toughness, low in melting point, low in water absorption rate, diversified in product and easy to process. The product obtained by the method is few in by-products, simple in production process and suitable for industrial continuous production.

The invention provides an ultra-thin glass UTG (Untranslated Glass) protective coating and flexible electronic product glass containing the protective coating. The protective coating comprises a network polymer with the following structural formula (I), the network polymer is provided with a plurality of acrylate modified polyurethane chains and a plurality of carbon chains, the acrylate modified polyurethane chains and the carbon chains are alternately connected to form a network, the carbon chains are straight chains or branched chains, and the lengths of the carbon chains are the same or different. According to the protective coating, the impact resistance of the ultrathin glass can be improved by more than 200%, and the ultrathin glass has excellent visible light transmittance (greater than or equal to 91.5%), low haze (less than 1%), high pencil hardness (greater than 2H) and good adhesive force and wear resistance. In the structural formula (I), m is an integer from 1 to 10000, and each group is defined in the specification.

The present invention relates to a method for exchanging heat with an object said method comprising using a heat transfer fluid wherein said heat transfer fluid comprises one or more chemical compounds having the general formula (I) wherein: —Rf can be any C1-C10 fluorinated linear or branched carbon chain which can be partially or fully fluorinated, and can comprise O or S atoms, —X, Y and Z can be independently selected from halogens or hydrogen, with the provision that at least one of X, Y or Z is a halogen.

The invention provides a BFD mutant and application thereof as a carbon chain elongase, and the BFD mutant is characterized in that (a) compared with an amino acid sequence as shown in SEQ ID NO.1, the BFD mutant contains at least one of the following sites: L43, A73, T100 and K165, and an amino acid sequence which is subjected to amino acid mutation and has an active function of the carbon chain elongase; or (b) an amino acid sequence which is obtained by substitution and / or deletion and / or addition of one or more conserved amino acid residues of the BFD mutant and the amino acid sequence shown in (a) and has the same function. The enzyme activity of the BFD mutant is obviously improved, and the yield and conversion rate of glycolaldehyde and / or 1, 3-dihydroxyacetone generated from formaldehyde are improved.