459 results about "Halohydrocarbon" patented technology

The invention discloses a synthetic method of a water soluble ultraviolet light absorber BP-9. The method mainly comprises the following process steps: (1) carrying out methylation on the main raw materials of 2, 2', 4, 4'-tetrahydroxyl benzophenone, a transition metal salt catalyst and a mixed solvent which is prepared from dichloroethane and anhydrous ethanol in equal parts by weight to obtain 2, 2'-dihydroxyl-4, 4'-dimethoxyl benzophenone; (2) carrying out sulfonation reaction on the main raw materials of methylate, sulfamic acid and C1-C3 halohydrocarbon to obtain 2, 2'-dihydroxyl-4, 4'-dimethoxyl benzophenone-5, 5'-disulfonic acid; and (3) carrying out neutral reaction on the main raw materials of sulfonated product, inorganic base and ethanol water to finally obtain the BP-9 product. The synthetic method disclosed by the invention is few in reaction step, low in cost, high in product purity and stable in quality, and raw materials are easily available.

The invention belongs to the technical field of dielectric materials, and particularly relates to a dielectric material based on polybenzocyclobutene as well as a preparation method and application of the dielectric material. According to the multi-benzocyclobutene-based dielectric material provided by the invention, different halogenated hydrocarbon, olefin and other raw materials are used, and on the basis of containing more than two benzocyclobutene groups, a specific group can be introduced into a connecting group so as to improve the dielectric property and thermal stability of the material; meanwhile, specific groups can be introduced into R2 and R3 through secondary Heck reaction to further improve the dielectric property and thermal stability of the material, so that the dielectric material with excellent comprehensive properties such as dielectric property and thermal stability is provided, and the technical problem of lack of dielectric materials for high-frequency and high-speed printed circuit boards (PCBs) in the prior art can be solved.

The invention relates to a synthetic method of brominated polystyrene with high thermal stability. The synthetic method comprises the following steps: S01, dissolving polystyrene in a halogenated hydrocarbon solvent in a reaction bottle to obtain a polystyrene solution; s02, adding aluminum chloride and bromine into another reaction bottle; s03, introducing hydrogen bromide gas into the reaction bottle in S02, and starting stirring to react at room temperature; s04, after the reaction in the step S03 is finished, reducing the temperature of the polystyrene solution in the step S01 to the reaction temperature, starting stirring, adding a free radical inhibitor, and dropwise adding the bromine and catalyst mixed solution obtained by the reaction in the step S03 into the polystyrene solution; s05, after dropwise adding is finished, adjusting the temperature to the heat preservation temperature, and carrying out heat preservation reaction for a period of time; and S06, after the heat preservation is finished, carrying out post-treatment to obtain the brominated polystyrene. According to the synthetic method of brominated polystyrene, the halogenation phenomenon of a main chain can be inhibited, the use of a catalyst is reduced, and the thermal stability of brominated polystyrene is improved.

The invention relates to the technical field of antibacterial high polymer materials, in particular to an antibacterial nylon material as well as a preparation method and application thereof. The method comprises the following steps: carrying out anion ring-opening copolymerization on a seven-membered ring lysine monomer obtained by ring formation of lysine and a lactam monomer to obtain copolyamide, dissolving the copolyamide, and carrying out complete quaternization reaction by using halogenated hydrocarbon to obtain the antibacterial nylon material. The preparation method provided by the invention effectively avoids the problems of insufficient antibacterial property, obvious mechanical property reduction, poor thermal stability and the like of an antibacterial nylon material prepared by hydrochloric acid protonation in the prior art. Meanwhile, the seven-membered cyclic lysine monomer can be copolymerized without alkylation, the synthesis process is greatly simplified, the production efficiency is high, and the production cost is low. The prepared antibacterial nylon material has the characteristics of lasting and efficient antibacterial performance, high safety, environment friendliness, excellent mechanical property and thermal stability and the like, and can be widely applied to the fields of textiles, daily necessities, packaging materials, panels and the like.

The invention relates to a water-based binder and a preparation method and application thereof, the water-based binder comprises modified polyvinyl alcohol, the modified polyvinyl alcohol has repetitive units shown as a formula (1) and a formula (2), # imgabs0 #, R1 is selected from one or more of-Ph and-Ph-(R3) n1, each R3 is the same or different, and n is a positive integer. The two groups are independently selected from one or more of halogen atoms and C1-C3 halogenated alkyl, and n1 is any integer between 1 and 5. The modified polyvinyl alcohol water-based binder disclosed by the invention has good dispersion performance on an electrode material and a conductive agent, keeps good compatibility with an electrolyte, and has the advantages of excellent cohesiveness and environment friendliness, so that the lithium ion battery further has excellent cycling stability and high rate performance, and the lithium ion battery has a wide application prospect. Therefore, the service life of the lithium battery is prolonged.

The invention provides a fluorine-containing thiophene compound, a preparation method thereof and an electrolyte. The structural formula of the fluorine-containing thiophene compound is as shown in formula I, R1 is fluorine or fluorosulfonyl, R2 is hydrogen, halogen, nitrile group, nitryl, C1-C6 alkyl or C1-C6 halogenated alkyl, and R3 is hydrogen, C1-C6 alkyl or C1-C6 halogenated alkyl. The fluorine-containing thiophene compound is improved on the basis of a conventional thiophene compound, fluorine or fluorosulfonyl is introduced, the defects of the conventional thiophene compound can be overcome, and when the fluorine-containing thiophene compound is used as an additive, the decomposition and oxidation reaction of an electrolyte in a high-pressure and high-temperature system can be reduced, so that the electrochemical performance of a lithium ion battery at high temperature and high pressure is improved.

The invention provides a method for preparing polyarylester by interfacial polycondensation, which comprises the following steps: dissolving a diphenol monomer in an alkali solution to prepare a bisphenol salt solution, and dissolving an interfacial catalyst in a bisphenol salt water phase to obtain a water phase; dissolving aromatic dicarboxylic acid acyl chloride in a halogenated hydrocarbon solvent to obtain an organic phase; s2, slowly adding the organic phase obtained in the step S1 into the water phase in a stirring state within 10-60 minutes, and continuously reacting for 10-120 minutes in the stirring state; the product is separated out in the form of precipitate, the precipitated precipitate absorbs the halogenated hydrocarbon solvent, so that a liquid phase main body is water, a solid phase is a muddy product containing the halogenated hydrocarbon solvent, and the obtained muddy product is filtered, washed and dried to obtain a powdery product. According to the method disclosed by the invention, the polymer is directly precipitated by controlling the solute concentration and the mixing ratio, so that the efficient in-situ removal of the solvent is realized, the solvent is directly separated from water through simple filtration, and'zero separation, zero crushing and zero distillation 'is realized.

The invention discloses a fluorescent anti-counterfeiting-encryption method for constructing a perovskite quantum dot array based on in-situ synthesis of a solid-phase photoetching method. The preparation method comprises the following steps: dissolving cesium perfluoroglutarate, lead oleate and hexabromocyclododecane in N, N-dimethylformamide, adding polymethyl methacrylate, heating and dissolving to obtain a mixed precursor solution, coating a glass substrate with the mixed precursor solution to obtain a precursor film, drying to remove N, N-dimethylformamide, and finally covering the precursor film with a pattern chromium mask plate to obtain the chromium-coated glass. And irradiating under a 254 nm ultraviolet lamp to obtain the CsPbBr3 fluorescent anti-counterfeiting array. According to the method, the perovskite nanocrystal fluorescent microarray is prepared in situ based on a photo-induced dehalogenation direct photoetching method, under the action of a mask plate, halogenated hydrocarbon is induced to dehalogenate through 254 nm ultraviolet light to generate halide ions and drive generation of perovskite nanocrystals, and perovskite nanocrystal fluorescent microarrays with different patterns can be obtained by adjusting the patterns of the mask plate. Developing, etching and other operations are not needed, and the method is very simple, convenient, efficient and low in cost.

The invention belongs to the technical field of lithium ion batteries, and particularly relates to a hydrophobic nano oxide solid electrolyte as well as a preparation method and application thereof. Compared with the prior art, the method has the advantages that an airflow crushing method is adopted, a halogenated hydrocarbon and inert gas mixed gas source is used as jet airflow, and secondary agglomerated powder is depolymerized again, so that the purposes of nanocrystallization and hydrophobicity are achieved; meanwhile, the halogenated hydrocarbon is subjected to molecular bonding with groups on the surface of the powder in the process, hydrophobic M-O-R (M represents a metal element and R represents alkyl) is formed on the surface, and finally the low-moisture solid electrolyte is obtained; and the nano solid electrolyte powder subjected to hydrophobic treatment is less in agglomeration, easy to disperse, good in powder fluidity, low in water content and low in water absorption in air and water, so that a nano solid electrolyte coating diaphragm prepared from the nano solid electrolyte powder has the advantages of low water content, low drying temperature, good battery high-temperature performance and the like.

The invention relates to an organic combined polluted underground water in-situ remediation method based on a micro-nano iron-based material. The method comprises the following steps: acquiring underground water pollution information; establishing a composite reaction zone at a preset position, and constructing a reduction-oxidation chain reaction system; and operating the composite reaction zone, collecting monitoring data, and optimizing the composite reaction zone until the composite pollution is degraded and removed to a preset value. Through series reaction of powerful reduction of the micro-nano iron-based material and advanced oxidation of the iron-based activated persulfate, the performance of the micro-nano iron-based material serving as a strong reduction material and an active agent is fully played, pollutants such as halogenated hydrocarbon in underground water are sequentially subjected to reduction degradation, pollutants such as benzene series and volatile phenol are sequentially subjected to oxidative degradation, and the pollution to the underground water is reduced. Effective management and control of underground water combined pollution of medical and chemical parks and enterprises are realized; a monitoring well is configured based on a composite reaction zone, and remediation materials are discontinuously added in combination with management and control conditions, or other management and control materials are flexibly selected, so that long-term management and control of groundwater pollution risks are realized.

The invention discloses a preparation method of a seven-membered cyclic lysine monomer and copolymerized polyamide, and relates to the field of organic synthesis. Alpha-amino-epsilon-caprolactam is obtained by taking lysine or lysine hydrochloride as an initial raw material, and then alpha-amino of an intermediate is alkylated by using alcohol under the catalysis of a catalyst to obtain a series of seven-membered cyclic lysine monomers. According to the preparation method provided by the invention, toxic and harmful reagents such as formaldehyde and halogenated hydrocarbon are not additionally introduced, and the green and environment-friendly requirements are met; meanwhile, the seven-membered cyclic lysine monomer can be copolymerized with lactam to obtain a series of copolymerized polyamides with various structures.

The invention discloses an electrolyte additive, an electrolyte and a battery, the electrolyte additive comprises a first additive and a second additive, the first additive comprises a compound shown as a formula 1: # imgabs0 #, R1 and R2 are respectively and independently selected from at least one of H, phenyl, halogen, C1-C6 alkyl, C1-C6 halogenated alkyl and # imgabs1 #, and R1 and R2 are not H at the same time; r3, R4 and R5 are respectively and independently selected from at least one of C1-C3 alkylene groups, oxygen atoms, O = S = O, C = O and S = O, at least one of R3, R4 and R5 is selected from O = S = O, C = O and S = O, and at least one of R3, R4 and R5 is selected from oxygen atoms; and the second additive comprises a compound shown as a formula 2: # imgabs2. The electrolyte additive is added into the electrolyte of the battery, so that the fast charging performance of the battery can be improved, and the high-temperature cycle performance can be improved.

The invention provides compound bacteria for biological enhancement and sludge reduction and a preparation method of the compound bacteria. The compound microbial preparation comprises 25 microbial strains capable of widely degrading organic compounds and sludge zoogloea, original strains with specific degradation capability are subjected to multi-step pure culture fermentation under limited conditions and then are compounded to obtain the compound microbial agent. The composite microbial preparation can be used for degrading various organic matters including aromatic hydrocarbons, alcohols, aldehydes, heterocyclic rings, halogenated hydrocarbons, anilines, phenols and the like and aged activated sludge zoogloea, and can be used for synergism and sludge in-situ reduction of biological systems of various industrial wastewater including municipal wastewater, petrochemical wastewater, synthetic chemistry, printing and dyeing wastewater and the like. Due to the excellent extracellular hydrolase producing function of the compound bacteria, the sludge yield of an existing biochemical system can be remarkably reduced, and in-situ reduction of the sludge is achieved.

The invention provides a high-temperature-resistant bactericidal corrosion inhibitor as well as a preparation method and application thereof. The preparation method comprises the following steps: reacting a sulfydryl carboxylic acid compound and polyethyleneimine in an organic solvent at a first temperature for a first time to obtain a system containing a first compound; and adding halogenated hydrocarbon into the system containing the first compound, reacting at a second temperature for a second time to obtain a system containing a second compound, removing the organic solvent, and drying to obtain the high-temperature-resistant bactericidal corrosion inhibitor. The high-temperature-resistant bactericidal corrosion inhibitor disclosed by the invention is prepared by the preparation method. The invention also provides an application of the high-temperature-resistant bactericidal corrosion inhibitor in microbial corrosion protection and / or chemical corrosion protection of oil and gas fields. The high-temperature-resistant bactericidal corrosion inhibitor disclosed by the invention is simple in preparation method, good in high-temperature stability and excellent in bactericidal corrosion inhibition performance.

The invention relates to the field of environmental bioremediation, in particular to a novel Desulfovibrio Co strain and application of the novel Desulfovibrio Co strain in reduction of sulfate type oxidized sulfide and degradation and conversion of 1, 1, 1-trichloroethane. The desulfurization vibrio Co strain is preserved in China General Microbiological Culture Collection Center (CGMCC) on February 24, 2024, the address is Institute of Microbiology, Chinese Academy of Sciences, No.3, No.1 Yard, Beichen West Road, Chaoyang District, Beijing, the postcode is 100101, and the preservation number is CGMCC No.41182. The desulfurization vibrio Co strain can be used for preparing the desulfurization vibrio Co strain.

The invention relates to the technical field of waste gas treatment, and particularly discloses waste gas treatment liquid for treating large-air-volume low-concentration waste gas through a water-based method. The waste gas treatment liquid for treating the large-air-volume low-concentration waste gas through the water-based method comprises a surfactant, a defoaming agent, a dissolution accelerant and water. Wherein the surfactant can be selected from any one or more of polyoxyethylene alkyl ether, polyoxyethylene alkyl ether and polyoxyethylene fatty acid ester; the dissolution accelerant can be selected from any one or more of ethylene glycol monobutyl ether, diethylene glycol monobutyl ether and triethylene glycol monobutyl ether; the defoaming agent is any one or more of butanol, dimethyl silicone oil, silicone and polyether modified polysiloxane. When the waste gas absorption liquid obtained in the invention is used for treating waste gas, the absorption efficiency of methanol, butanol, benzene, toluene, xylene, ethyl acetate, dichloromethane and acetone is obviously improved, and the absorption efficiency of the waste gas absorption liquid on aromatic hydrocarbon, halogenated hydrocarbon, alcohol, ketone and ester pollutants is improved.

The objective of the present invention is to provide a method for producing a halogenated carbonyl safely and efficiently. The method for producing a halogenated carbonyl according to the present invention is characterized in comprising the step of applying ultrasound to a composition containing a C1-4 halogenated hydrocarbon having one or more halogeno groups selected from the group consisting of chloro, bromo and iodo in the presence of oxygen to decompose the C1-4 halogenated hydrocarbon.

The invention provides a non-aqueous electrolyte and a lithium ion battery containing the non-aqueous electrolyte. The non-aqueous electrolyte comprises a non-aqueous organic solvent, an electrolyte salt and an additive. The additives include a first additive and a second additive. The first additive is a compound containing a uracil structure and has a structural formula as shown in a formula I, and the second additive is a cyclic carbonate ethylene sulfate compound and has a structural formula as shown in a formula II. R1 to R3 are respectively and independently selected from hydrogen, halogen, C1-C6 alkyl, C1-C6 halogenated alkyl, a nitryl-containing group, an amino-containing group, a hydrazino-containing group, a cyano-containing group or a carbonyl-containing group, X is C or N, at least one of R, S and T is carbonyl, and at least one of R, S and T is sulfonyl. Through the synergistic effect of the compound containing the uracil structure and the cyclic carbonate ethylene sulfate compound, the interface stability between the positive electrode, the negative electrode and the electrolyte can be improved, and the transmission efficiency of lithium ions is improved, so that the high-temperature storage performance and the high-temperature cycle performance of the battery are improved. # imgabs0 #

The invention relates to the field of batteries, in particular to an electrolyte and an electrochemical device. The electrolyte comprises an organic solvent, an electrolyte and an electrolyte additive, and the electrolyte additive comprises a nitrile additive A and a nitrile additive B; the nitrile additive A comprises at least one of acetonitrile or butanedinitrile; the nitrile additive B comprises at least one of compounds shown as a formula I, # imgabs0, and R1 and R2 are independently and optionally selected from hydrogen, a straight chain or branched chain cyano group with the carbon atom number of 1-10, a straight chain or branched chain alkoxy group with the carbon atom number of 1-10, and a straight chain or branched chain halogenated hydrocarbon with the carbon atom number of 1-5. By combining the nitrile additive A and the nitrile additive B, the high-temperature storage performance and the cycle performance of the battery can be effectively improved at the same time.

The invention discloses a preparation method of a zero-valent iron reduction material with micro-nano size and water stability, and belongs to the field of underground water pollutant degradation materials. The method comprises the following steps: 1) uniformly mixing micron-sized zero-valent iron powder and hexadecyl trimethoxy silane, and carrying out mechanical ball milling; and 2) cleaning the material with a cleaning agent, and drying to obtain the zero-valent iron reduction material with micro-nano size and water stability. According to the preparation method, a mechanical ball milling method and a hexadecyl trimethoxy silane surface modification method are utilized to cooperate, so that micro-nano size and surface hydrophobicity of the zero-valent iron are stabilized, agglomeration and passivation of the zero-valent iron in water are inhibited, and the reduction activity and water stability of the zero-valent iron material are improved; the reducing capacity of the material on pollutants such as halogenated hydrocarbon and heavy metal in water is remarkably improved, the material can be kept stable in water for a long time, the technical problems that the micro-nano zero-valent iron reducing material is prone to inactivation and difficult to store are solved, and waste of material resources can be reduced.

The invention belongs to the technical field of organic synthesis, and discloses a synthesis method of a disulfide compound. According to the invention, under the catalytic action of 1, 4, 7, 10, 13, 16-hexaoxacyclo-octadecane, halogenated hydrocarbon, sodium sulfide and sulfur react at the temperature of 50-60 DEG C to prepare the disulfide compound. The synthesis method of the disulfide compound has the advantages of being simple in process, small in catalyst dosage, mild in reaction condition, high in production efficiency, low in production cost, convenient for industrial production and the like, in addition, the reaction yield of the synthesis method can reach 94.8%-96.6%, and the purity of the obtained target product reaches up to 97.9%-99.3%. The method can be applied to preparation of the disulfide compound, and the obtained disulfide compound can be further applied to the fields of biomedicine, agriculture, chemical industry and the like.

The invention discloses an o-benzoyl sulfimide derivative pure organic long-afterglow material as well as a preparation method and application of the o-benzoyl sulfimide derivative pure organic long-afterglow material. The preparation method of the material comprises the following step: carrying out one-step reaction on o-benzoyl sulfonyl imide and corresponding halogenated hydrocarbon or acyl chloride to synthesize the N-site modified long afterglow material of the o-benzoyl sulfonyl imide. The invention has the following characteristics: (1) the raw materials are cheap and easily available, and the synthesis process is mature; (2) the material is long in afterglow life and high in quantum efficiency; and (3) the material has low cytotoxicity and good biocompatibility, and has great potential in the fields of long afterglow display and drug anti-counterfeiting.

The invention discloses a method for restoring arsenic and halogenated hydrocarbon combined contaminated soil through oxidation enhanced leaching and a leaching agent. The leaching agent is composed of a first-stage leaching solution and a second-stage leaching solution. The first-stage leacheate eluting agent is composed of persulfate and strong base; the second-stage leacheate eluting agent is composed of organic acid and alcohol. According to the method, a two-stage leaching mode is adopted for the arsenic and halogenated hydrocarbon combined contaminated soil, synchronous removal of arsenic and halogenated hydrocarbon in the contaminated soil can be achieved through the oxidation strengthening synergistic interaction effect of the leaching agent, the toxicity of arsenic can be reduced, potential safety hazards in the subsequent waste liquid treatment process can be reduced, and the method is mild in condition and easy to implement. The method has the advantages of high removal rate, low cost and the like.

The invention provides antibacterial and antioxidant ultrasonic-induced piezoelectric hydrogel and a preparation method and application thereof.According to the antibacterial and antioxidant ultrasonic-induced piezoelectric hydrogel, a compound containing amido and double bonds reacts with a halogenated hydrocarbon compound through quaternization reaction to synthesize a series of cationic quaternary ammonium salt serving as an antibacterial component, and an antioxidant component is introduced; and adding the hydrogel into a hydrogel precursor solution containing acrylic acid and N-isopropylacrylamide, and synthesizing the ionized water gel with antibacterial, antioxidant and ultrasonic induced piezoelectric properties by adopting a photocuring strategy. The hydrogel shows excellent mechanical properties, good biocompatibility and adhesion, and can generate an endogenous electric field under ultrasonic excitation to regulate cell behaviors. Experimental results show that the hydrogel can effectively promote infection inhibition and alleviate oxidative stress, and has a remarkable treatment effect in diabetes infected wound and articular cartilage repair. The hydrogel is simple in preparation method, low in cost and suitable for the biomedical fields of wound treatment, tissue repair and the like.

The invention relates to a chiral ferrocene skeleton diphosphine ligand and an application thereof in a catalyst, and the disclosed ligand is a novel ferrocene skeleton diphosphine ligand, and the ligand has the advantages of low cost, simple synthesis, good stability and the like. The metal complex of the ligand shows very excellent catalytic activity in CN coupling reaction, can efficiently catalyze coupling of building blocks such as halogenated hydrocarbon and sulfonate with ammonia, amine or hydrazine compounds, and has important industrial application value.

The present invention belongs to the field of new materials. Provided are a polyether-type thiol composition and the use thereof. The polyether-type thiol composition comprises a polyether-type thiol compound and a compound as represented by formula (1), wherein the polyether-type thiol compound is mainly obtained by means of a reaction between a polyhydric alcohol, a halogenated hydrocarbon and a sulfhydrylization reagent, with the hydroxyl value of the polyhydric alcohol being 300-600 mgKOH / g; and the compound as represented by formula (1) is 0.01%-8% of the total mass of the polyether-type thiol composition. The polyether-type thiol composition can be used independently or used in a mixture with other thiol compounds; and the polyether-type thiol composition and an epoxy resin are cured under the action of an accelerant and an auxiliary agent so as to prepare an adhesive, and the adhesive can be used as a raw material to prepare a sealant. The polyether-type thiol composition can not only achieve rapid curing of an epoxy resin adhesive at room temperature, but can also improve the flexibility of an adhesive system, thereby improving the long-lasting safety of an application scenario of a sealant product in the building industry, thus maintaining the physical and psychological health of a human body for a long time.

The invention relates to polyamide synthesized by carbon dioxide and a preparation method thereof, and belongs to the technical field of polymer synthesis. The technical problems of long reaction time, low yield, poor product performance and the like in the existing technology for converting the carbon dioxide into the polymer by utilizing the Ugi multi-component reaction are solved. The preparation method comprises the following steps: in a halogenated hydrocarbon solvent, pre-polymerizing primary diamine and aryl dialdehyde, adding alcohols, an organic base catalyst, CO2 and mono-functional group isonitrile, reacting to obtain a reactant, and purifying the reactant to obtain polyamide. The preparation method is mild in reaction condition, short in reaction time and high in yield, the use of di-isonitrile is avoided, the cost can be reduced, and the prepared polyamide has excellent solvent resistance, is only slowly dissolved in dichloromethane and trichloromethane and is insoluble in other solvents.

The invention relates to the technical field of lithium ion battery safety, in particular to a supramolecular lithium battery fire inhibitor and a preparation method and application thereof. The supramolecular lithium battery fire inhibitor is prepared from the following raw materials in parts by weight: 10-50 parts of a supramolecular synergist, 30-90 parts of halogenated hydrocarbon and 0-20 parts of mineral oil, wherein the supramolecular synergist is prepared from perfluorohexanone and ethyoxyl (pentafluoro) cyclotriphosphazene. The supramolecular lithium battery fire inhibitor provided by the invention has relatively high electrical insulativity and efficient fire extinguishing characteristic, and the supramolecular acting force and fire extinguishing synergistic elements of the system are increased by introducing the supramolecular synergist, so that the stability, volatility and fire extinguishing efficiency of the inhibitor system are further improved, and the application value of the supramolecular lithium battery fire inhibitor is greatly increased.

The invention provides an ice source and low-temperature air source heat pump combined energy supply system based on a halogenated hydrocarbon refrigerant, and relates to the technical field of heat pumps, the ice source and low-temperature air source heat pump combined energy supply system comprises a cold and hot dual-system heat pump subsystem, an ice mold subsystem and a finned tube heat exchanger subsystem; the two ends of one side of the cold and hot dual-system heat pump subsystem are connected with a water supply loop and a water return loop on the user side respectively. Two ends of the other side of the cold and hot dual-system heat pump subsystem are respectively connected with one side of the ice mold subsystem and one end of the finned tube heat exchanger subsystem; the other side of the ice mold subsystem is also connected with the other end of the finned tube heat exchanger subsystem; and an ice-making medium on the other side of the cold and hot dual-heating heat pump subsystem is a halogenated hydrocarbon refrigerant. The system is simple in structure, easy to operate and rapid and convenient to install, the medium adopted by the system is the halogenated hydrocarbon refrigerant, the operation cost is low, and the effect is obvious.

This invention discloses a method for synthesizing dialkylphosphinates, belonging to the field of organic synthesis technology. The method uses hypophosphite and haloalkanes as starting materials. First, a hypophosphite is generated through a heated and pressurized reaction under the action of a phase transfer catalyst. The obtained hypophosphite does not require complex purification; it is directly reacted with an olefin under heated and pressurized conditions in the presence of a free radical initiator to obtain the target product, dialkylphosphinate. The method of this invention uses inexpensive and readily available raw materials, has a simple process route, includes only two core reactions, operates under mild conditions, is safe and convenient, produces few and easily treatable byproducts, has a high product yield, and is simple to purify. It is very suitable for large-scale industrial production, providing an economical and efficient synthetic route for the preparation of high-performance halogen-free flame retardants.