12 results about "Citraconic Anhydrides" patented technology

The invention provides an electrolyte and application thereof, and relates to the technical field of secondary batteries. Specifically, the electrolyte comprises an alternating copolymer, a first solvent, a second solvent, a third solvent, a lithium salt and an additive, the alternating copolymer is obtained by polymerizing a first monomer and a second monomer; the first monomer comprises terminal alkenyl, terminal halogen atoms and ether bonds, and the second monomer comprises at least one of maleic anhydride, citraconic anhydride, itaconic anhydride, maleimide and 2, 5-thiophenedione. The electrolyte disclosed by the invention has relatively high low-temperature ionic conductivity while having high-temperature safety; the electrolyte is in a liquid state at a low temperature, has relatively high ionic conductivity, is in a solid state after reversible phase change along with temperature rise, has safety and stability in a high-temperature state, and has a good application prospect.

This invention relates to the field of insulating materials, and more particularly to a thermoplastic polyolefin insulating material, its preparation method, and its applications. The raw materials for preparing the thermoplastic polyolefin insulating material mainly include functional modified monomers and polyolefins. The polyolefins include poly4-methylpentene, and the functional modified monomers are unsaturated acid anhydrides and their analogues, including at least one of citrate anhydride, maleimide, and maleic anhydride. The thermoplastic polyolefin insulating material prepared by this invention exhibits excellent high-temperature resistance and high-temperature DC volume resistivity, making it suitable for long-term use under high temperature and high electric field strength conditions. It can be used in the field of cable insulation materials and has thermoplastic recyclability.

The application discloses a preparation method of 1,3-disubstituted cyclobutane-1,2,3,4-cyclobutane tetra carboxylic dianhydride, which comprises the following steps: (1) uniformly stirring citraconic anhydride, ethyl acetate and a catalyst, and performing microwave continuous flow reaction; after the reaction is completed, filtration is performed to obtain 1,3-dmcbda crude product I; (2) adding acetic anhydride and stirring under heating, then reducing to room temperature, and performing filtration to obtain 1,3-dmcbda crude product II; then adding acetone, heating to reflux, then reducing to room temperature, and performing vacuum drying to obtain 1,3-dmcbda fine product. The preparation method can make the 1,3-dmcbda product have high yield and high purity, and is suitable for industrial production.

The invention relates to the technical field of biology, in particular to a chemical modification hot start Taq DNA polymerase and a preparation process and application thereof. The invention provides a preparation method of a chemically modified hot start Taq DNA polymerase, which comprises the following steps: mixing citraconic anhydride and Taq DNA polymerase to obtain the chemically modified hot start Taq DNA polymerase. The invention further provides an activation method, a storage method and application of the chemical modification hot start Taq DNA polymerase. Compared with the prior art, the chemically modified hot start DNA polymerase provided by the invention is prepared at a lower cost and has the advantages of good hot start performance, simple process flow, low equipment requirement, small batch difference, good stability and good hot start effect, and gram-level preparation can be realized.

The invention relates to a liquid decolorizing agent for decolorizing crude styrene and a decolorizing method of crude styrene. The liquid decolorizing agent contains 70-90 wt% of a decolorizing component and the balance of a polymerization inhibitor. Wherein the decolorizing component contains a first decolorizing component and optionally a second decolorizing component, and the first decolorizing component contains citraconic anhydride. The decolorizing agent disclosed by the invention is liquid at normal temperature, stable in property and good in decolorizing effect.

The present disclosure relates to an electrolyte suitable for a lithium primary battery. In order to solve the problems of poor safety performance, high-rate discharge and poor discharge performance of electrolytes of the existing lithium primary batteries under a high-temperature condition, the electrolyte includes an electrolyte lithium salt, an additive, and an organic solvent, wherein the electrolyte lithium salt includes one or more of lithium trifluoromethanesulfonate, lithium bis(triflu-oromethanesulphonyl)imide, lithium difluorophosphate, and lithium difluoro(oxalato)borate; the additive includes one or more of (2-trimethylsilylethyl)2-cyanoacetate, diphenyldimethoxysilane, and citraconic anhydride; and the organic solvent comprises a carbon-ate solvent and a glycol ether solvent. A selective combination of the electrolyte lithium salt, the additive, and the solvent, normal-temperature discharge can be met when the electrolyte is applied to the lithium primary battery. The lithium primary battery can take into account the constant / high temperature performance, high-rate discharge performance and safety performance.

Block copolymers of the formula: B1 __ block __ (R2)n (I) where B1 is (R1 __alt __R2)m or (R2 __alt __R1)m, and methods of their synthesis are provided. R1 is an electron poor anhydride functional monomer that can be hydrolyzed into a dicarboxylic acid, such as maleic anhydride, citraconic anhydride and itaconic anhydride. R2 is an electron rich vinyl monomer that is polymerizable to form water soluble and biocompatible polymers, such as N-vinylpyrrolidone, N-vinylformamide, N- vinylacetamide, N-vinyl-N-methylacetamide, N-vinylcaprolactam, vinyl acetate and vinyl pivalate. Anhydride groups of the R1 monomer can be hydrolyzed to carboxylate groups for conjugation to therapeutic molecules, such as platinum(II) drugs. In one embodiment, the block copolymer is poly(NVP-alt-MA)-block-PVP block copolymer. The block copolymers can be formed by RAFT polymerization in a one pot, one step process. These block copolymers and pharmaceutical compositions including them can be used to treat or prevent diseases, for example cancer.

The application provides an electrolyte and application thereof, and relates to the technical field of secondary batteries. Specifically, the electrolyte comprises an alternating copolymer, a first solvent, a second solvent, a third solvent, a lithium salt and an additive; the alternating copolymer is obtained by polymerization of a first monomer and a second monomer; the first monomer comprises a terminal alkenyl group, a terminal halogen atom and an ether bond, and the second monomer comprises at least one of maleic anhydride, citraconic anhydride, itaconic anhydride, maleimide and 2,5-thiophenedione. The electrolyte of the application has high-temperature safety and high low-temperature ionic conductivity; the electrolyte of the application is in a liquid state at low temperature, has high ionic conductivity, is in a solid state after reversible phase transition with the increase of temperature, has safety and stability at high temperature, and has a good application prospect.

The application discloses a synthesis method of 1,3-bis(citraconimidemethyl) benzene, citraconic anhydride and m-xylylenediamine are reacted in the presence of an organic acid and a benzene series solvent to obtain 1,3-bis(citraconimidemethyl) benzene, wherein the mass of the organic acid accounts for 30-50% of the total mass of the organic acid and the benzene series solvent. In the synthesis method, the benzene series solvent and the organic acid are used as double solvents, the organic acid also has the function of a catalyst, the amount of material is small, the condensation reflux temperature is low, the inhibition effect on amine byproducts is good, the corrosion of the reaction container is small, the reaction time is short, the double solvents after the reaction do not need to be separated, can be directly used, the atomic economy is high, and the industrialization is more favorable.

The invention relates to the technical field of flotation preparation, in particular to a preparation method and application of a lepidolite mineral flotation inhibitor. The preparation process comprises the following steps: preparing citraconic anhydride; preparing a polymer monomer; preparing a copolymer; and preparing the lepidolite mineral flotation inhibitor. According to the invention, citraconic anhydride and sulfamic acid react to generate a copolymer monomer, the copolymer monomer can react with a specific chemical group on the surface of lepidolite to form a stable chemical bond or adsorption layer, and the specific chemical action enables the inhibitor to be more effectively adsorbed on the surface of lepidolite, so that the inhibition effect on lepidolite is improved; the flotation recovery rate of lepidolite is reduced, meanwhile, the influence on other minerals is small, the selectivity of the flotation process is improved, and therefore the recovery rate is increased.

The present invention relates to an electrolyte suitable for lithium primary batteries. In order to solve the problems of poor safety performance, high-rate discharge performance and discharge performance of electrolytes for conventional lithium primary batteries under high temperature, the electrolyte according to the present invention includes an electrolyte lithium salt, an additive and an organic solvent, where the electrolyte lithium salt includes one or more of lithium trifluoromethanesulfonate, lithium bis(trifluoromethanesulfonyl)imide, lithium difluorophosphate and lithium difluoro(oxalato)borate; the additive includes one or more of 2-trimethylsilylethyl2-cyanoacetate, diphenyldimethoxysilane and citraconic anhydride; and the organic solvent includes a carbonate solvent and an glycol ether solvent. Through the selection and combination of the electrolyte lithium salt, the additive and the solvent, the electrolyte can meet the requirement of normal-temperature discharge when applied in lithium primary batteries, so that lithium primary batteries can have normal-and-high-temperature performance, high-rate discharge performance and safety performance, and therefore, lithium primary batteries can be better popularized and applied.

The invention provides a composition, a preparation method thereof and a carrier, and belongs to the technical field of high polymer materials. The composition comprises the following components in percentage by mass: 50%-85% of cycloolefin resin, 3%-25% of a first thermoplastic elastomer, 10%-25% of a second thermoplastic elastomer and 0.3%-8% of conductive filler. The first thermoplastic elastomer comprises a thermoplastic elastomer and a polar monomer grafted to the thermoplastic elastomer; the polar monomer comprises at least one of maleic anhydride, itaconic anhydride, citraconic anhydride, crotonic anhydride, acrylic acid, methacrylic acid, methyl acrylate, ethyl acrylate, methyl methacrylate, ethyl methacrylate and glycidyl methacrylate. The second thermoplastic elastomer includes a styrene segment as a repeating unit. The material prepared from the composition has the characteristics of low moisture absorption, high heat resistance, high cleanliness, high mechanical strength and antistatic property.