7 results about "Haloketone" patented technology

The application discloses a bisphenol A type haloketone monomer, a polyaryletherketone resin and a preparation method and application thereof. The polyaryletherketone resin is a linear polymer composed of structural unit 1 or a polymer linearly and randomly arranged by structural unit 1 and structural unit 2: -R1-A-, structural unit 1; -R2-A-, structural unit 2; wherein A is 1'4-benzenedioxy, 1'3-benzenedioxy or 4'4-biphenyldioxy. The polyaryletherketone resin prepared by using the bisphenol A type haloketone monomer has better mechanical properties, and also has better thermal stability and crystallinity.

The invention provides a method for directly preparing alpha-monohalogenated ketone by co-catalyzing alkyne through a visible light-iron-based material, and belongs to the technical field of organic synthesis.The method comprises the steps that alkyne serves as a reaction substrate, and under visible light irradiation, high-selectivity conversion from alkyne to alpha-monohalogenated ketone is achieved in one step through the synergistic effect of an iron-based catalyst and inorganic halide. According to the method, cheap and nontoxic inorganic halide is adopted as a halogen source, reaction conditions are mild, catalysis of a strong oxidant, precious metal and rare metal is not needed, and the method has good functional group compatibility and high selectivity. The method disclosed by the invention is simple and convenient to operate, mild in condition and environment-friendly, provides a new strategy for clean synthesis of alpha-halogenated ketones, especially monohalogenated ketone compounds, and has a good application prospect.

This invention discloses a method for detecting disinfection byproducts in drinking water. By combining gas chromatography-triple quadrupole dynamic multiple reaction monitoring, ion pair information and standard curves containing disinfection byproduct standards are established. The extracted sample solution is tested under the same test conditions, enabling simultaneous extraction and quantitative and qualitative analysis of 34 disinfection byproducts in the sample. The byproducts detected simultaneously include five categories of substances: trihalomethanes, halonitromethanes, haloaldehydes, haloketones, and haloacetonitrs. This greatly increases the variety of disinfection byproducts that can be detected simultaneously and improves the detection efficiency.

The invention belongs to the technical field of organic synthesis, and discloses a synthesis method of a 3-alkylpyrazole-4-carboxylic acid derivative, which comprises the following steps: by taking alpha-halogenated-beta-keto ester as shown in a general formula (I), a hydrazine compound as shown in a general formula (II) and a formaldehyde donor as reaction raw materials, carrying out a reaction under the existence of alkali, so as to obtain the 3-alkylpyrazole-4-carboxylic acid derivative. And carrying out a one-pot reaction in the presence of water and / or an alcohol solvent to generate the 3-alkylpyrazole-4-carboxylic acid derivative as shown in a formula (III). According to the synthesis method disclosed by the invention, a formaldehyde donor, hydrazine (or substituted hydrazine) and alpha-halogenated-beta-keto ester which are low in price and easy to obtain are taken as raw materials, and the target product is efficiently synthesized with high selectivity by a three-component one-pot method through innovative'fast-slow-fast 'reaction process regulation and control; the problems of many steps, poor selectivity and difficult control of direct participation of formaldehyde in the reaction in the traditional method are overcome.

The application relates to the technical field of energy storage safety, and particularly discloses a fire-retardant cooling liquid, a preparation method thereof, an immersion type energy storage device, a data center and an electric equipment. By introducing specific modifiers, i.e. at least one of liquid halogenated alkanes containing 2-6 carbon atoms, liquid halogenated alkenes, liquid halogenated ketones and liquid halogenated cycloalkanes containing 3-6 carbon atoms, into base oil, the system viscosity is effectively reduced, the heat dissipation performance is improved, the insulation performance of the base oil is significantly improved, and the fire resistance of the base oil is further enhanced. Therefore, the application can consider environmental protection and safety, significantly improve the heat management efficiency of the cooling liquid, and has a good application prospect.

The invention belongs to the technical field of 3D printing materials, and particularly relates to a polyaryletherketone sequence copolymer, a preparation method thereof and application of the polyaryletherketone sequence copolymer in 3D printing. The preparation method comprises the following steps: mixing a first aromatic diphenol monomer, a first dihaloketone monomer, an organic solvent, a water-carrying agent and a catalyst, and sequentially carrying out a water-carrying reaction and a prepolymerization reaction to obtain an oligomer-containing system; and mixing the oligomer-containing system, a functional monomer and a second dihaloketone monomer for chain extension, and then adding a second aromatic diphenol monomer for further chain extension and end capping to obtain the polyaryletherketone sequence copolymer. According to the invention, the length of the oligomer sequence is accurately controlled by regulating and controlling the molar ratio of aromatic diphenol to dihaloketone in the initial stage; and then adding a monomer for chain extension to realize active design of sequence distribution of different functional chain segments in the final copolymer. Under the synergistic effect of all the chain segments, the crystallization rate and the melting point are reduced on the premise that the mechanical performance and excellent interlayer adhesion of the material are guaranteed, a wider processing window is obtained, and the material is suitable for 3D printing.

The invention provides a method for preparing an aryl [a] carbazole compound by taking a 2-aryl indole compound and alpha-haloketone as raw materials and reacting under an acidic condition. Compared with other methods for preparing the aryl [a] carbazole compound, the method disclosed by the invention does not need any metal catalyst, the used raw materials and reagents are cheap and easy to obtain, the substrate application range is wide, and the method is suitable for industrial production. Various substituted 2-aryl indole compounds and cyclic or chain alpha-haloketones (or phenyl or naphthyl substituted alpha-haloketones) can smoothly react to prepare a series of aryl [a] carbazole compounds. The method has the advantages of mild reaction conditions, fast reaction speed, good chemical selectivity, few side reactions, realization of gram-scale amplification, convenient subsequent product separation, high reaction yield, realization of industrial production, and substantial economic and social benefits.