12 results about "Tetrahydrofuran" patented technology

The invention belongs to the technical field of polymer preparation, and especially relates to a preparation method of a thermoplastic polyurethane elastomer. The method comprises the following steps: 1, putting 1,4-cyclohexyl diisocyanate, polyethylene glycol adipate, 1,4-butylene glycol, a lubricant and a hydrolysis resistance agent in a blender, fully stirring, and fully plastifying in a high-temperature plastifying machine or a high-temperature internal mixer to obtain a thermoplastic polyurethane elastomer matrix; 2, processing an inorganic nanofiller by a silane coupling agent to obtain an modified inorganic nanofiller; and 3, dissolving the thermoplastic polyurethane elastomer matrix in tetrahydrofuran, adding the modified inorganic nanofiller, mechanically stirring, removing tetrahydrofuran, and carrying out film forming to obtain the thermoplastic polyurethane elastomer. Compared with the prior art, the method provided by the invention can effectively increase the heat resistance, the mechanical performances and the ageing resistance of the polyurethane elastomer on the premise that the comprehensive performances of the thermoplastic polyurethane elastomer do not decrease.

The invention discloses a method for preparing a 2-iodine amyl -2-ene-1,4-diketone derivative by adopting visible light catalysis. The method comprises the steps of adding allene, perfluorobutyl iodide, an additive and a photocatalyst as shown in a formula (I) to an organic solvent at the molar ratio of 1:(1-2):(1-2):(0.005-0.1), stirring under the conditions of an oxygen atmosphere, visible light illumination, room temperature and ordinary pressure for 10-20h, carrying out post-treatment on a reaction liquid to obtain a 2-iodine amyl -2-ene-1,4-diketone derivative as shown in a formula (II), wherein the additive is NaI, NH4I or KI; the organic solvent is ethanol, dichloromethane, benzene, methylbenzene, tetrahydrofuran or acetonitrile; the photocatalyst is selected from one of the following components: Ir(ppy)3, Eosin Y, Rose Bengal, [Ir(dF-CF3-ppy)2(dtbbpy)]PF6, [Ir(ppy)2(tbbpy)]PF6, Ru(bpy)3(BF4)2. The method is mild in reaction condition, simple in operation, high in selectivity and good in yield; a substituent group can be expanded; and visible light catalysis is adopted, so that the method has the characteristics of being free of pollution and environment-friendly. The formulas are as shown in the specification.

The present invention discloses a decomposable environmentally-friendly heat-insulation packaging bag which comprises the following parts by weight of raw material components: 20-40 parts of straw fiber, 10-15 parts of rice husk powder, 10-15 parts of acrylate-1 and 1-dichloroethylene copolymer, 1-2 parts of zinc gluconate, 1-2 parts of gelatin, 2-8 parts of aluminum hydroxide, 2-6 parts of potassium hydroxide, 13-15 parts of furfuryl alcohol resin, 2 5 parts of zinc oxide, 0.5-1 part of talc powder, 5-6 parts of wax, 1-3 parts of silica powder, 2-4 parts of tetrahydrofuran, 8-13 parts of polyethylene, 0.5-1 part of nano-organic montmorillonite, 2-6 parts of silicon oxide powder, 2-4 parts of a foaming agent and 2-4 parts of clay. The decomposable environmentally-friendly heat-insulation packaging bag takes the environmentally friendly materials, is green and environmentally-friendly, has heat-insulation effect, and is suitable for cooked food packaging.

The invention provides a preparation method of a pH-responsive quick self-repairing collagen-based hydrogel with adhesivity, antibiosis and pressure resistance. The preparation method comprises the following steps: S1, weighing PEG 2000, 4-formylbenzoic acid and dimethylaminopyridine, dissolving in tetrahydrofuran, adding N, N'-dicyclohexylcarbodiimide in a nitrogen atmosphere, stirring, and then filtering to obtain a white solid; dissolving the white solid in tetrahydrofuran, precipitating in diethyl ether, drying to obtain DA-PEG, and dissolving in water to prepare a DA-PEG solution; S2, weighing and mixing a prepared collagen solution with a chitosan solution, wherein the mass ratio of the collagen solution to the chitosan solution is 3: 1-1: 3 to obtain a collagen/chitosan mixed solution; S3, adding a DA-PEG solution into the collagen/chitosan mixed solution under an ice bath condition to prepare a collagen/chitosan/DA-PEG mixed solution, adjusting the pH value to be 3.6-4.8, and uniformly mixing; and standing to obtain the pH-responsive quick self-repairing collagen-based hydrogel with adhesiveness, antibiosis and pressure resistance.

The invention discloses a preparation method of a dye sensitizer based on phenothiazine. The method comprises the following steps: adding a molar equivalent amount of phenothiazine to a one-mouth flask, dissolving phenothiazine in DMSO, adding 2 molar equivalent amounts of a NaOH solid, carrying out room temperature stirring for 30min, adding 1.6 molar equivalent amounts of 1-bromohexadecane in a dropwise manner under the protection of nitrogen by using a dropping funnel, reacting at room temperature for 24h, carrying out reduced pressure distillation to remove the DMSO, extracting the above reactant with dichloromethane three times, and drying the above obtained organic layer with anhydrous MgSO4 for 8h. The dye sensitizer R adopting a phenothiazine derivative as an electron donor and cyanoacrylic acid as an electron acceptor is synthesized through adopting a phenothiazine molecule as a template and phenothiazine and cyanoacrylic acid as connecting groups, and the dye sensitizer R is soluble in organic solvents, such as chloroform, toluene and tetrahydrofuran. Results of nuclear magnetic resonance verification of the structure of an intermediate for synthesizing the dye sensitizer R, ultraviolet-visible absorption spectrum, fluorescence spectrum and electrochemical performance analysis of the intermediate show that the optical band gap of the intermediate is basically consistent with the electrochemical band gap, so the dye sensitizer can be used as a good luminescent material.

The invention discloses a high-selectivity aggregation induced chemiluminiscence probe for <1>O2 as well as a preparation method and an application of the chemiluminiscence probe. The structural formula of the chemiluminiscence probe is shown in the description, and the chemical name is 6-(4-(1,2,2-triphenylethyl)phenyl)-2,3-dihydrophthalazine-1,4-dione (TPE-PH for short). Chemiluminiscence of theprobe is weak when a solution is formed by the probe in a good solvent such as tetrahydrofuran. In a tetrahydrofuran-water mixed solvent, when proportion of water is larger than 70% (V/V), chemiluminiscence produced when formed nano-aggregate is oxidized by <1>O2 is enhanced sharply with increase of the proportion of water in the mixed solvent, the probe has typical aggregation induced reinforcedchemiluminiscence characteristic, and emission wavelength peak is 485 nm. The TPE-PH nano-aggregate has quite high chemiluminiscence selectivity for <1>O2 under physiological conditions and can recognize <1>O2 on nanomole level, which proves that TPE-PH is a novel chemiluminiscence probe capable of recognizing and detecting <1>O2 with high selectivity and high sensitivity in a physiological system.

The present invention relates to a process for preparing a compound of formula (Ia), (Ib), (Ic) or (Id), or a pharmaceutically acceptable salt, hydrate, solvate, complex or prodrug thereof, said process comprising the steps of: (A) (i) treating a compound of formula (IVa), where R⁴⁸ is alkyl or tosyl, with an oxidizing agent to form a compound of formula (Va); and (ii) converting said compound of formula (Va) to a compound of formula (Ia) or (Ic); or (B) (i) treating a compound of formula (IVb), where R⁴⁸ is alkyl or tosyl, with an oxidizing agent to form a compound of formula (Vb); and (ii) converting said compound of formula (Vb) to a compound of formula (Ib) or (Id).

The invention discloses a permanent compression resistant sealing ring for a carrier roller, which is prepared from the following raw materials in parts by mass: 80 to 120 parts of nitrile rubber, 10 to 20 parts of fluororubber, 5 to 15 parts of graphene oxide, 10 to 20 parts of inorganic composite carbon, 5 to 15 parts of polytetrahydrofuran ether glycol, 2 to 8 parts of isophorone diisocyanate, 1 to 2 parts of zinc oxide, 1 to 2 parts of stearic acid, 0.1 to 1 part of dibutyltin dilaurate, 1 to 2 parts of antioxidant, 1 to 2 parts of plasticizer and 1 to 2 parts of accelerant. 1-2 parts of sulfur; wherein the inorganic composite carbon takes graphite carbon as a carrier, and glassy carbon is adopted to fill and coat the graphite carbon. The nitrile rubber and the fluororubber are adopted as main materials, multiple high-strength barrier layers are formed in a product after the pretreated graphene oxide is subjected to three-dimensional crosslinking in the nitrile rubber and the fluororubber, and under the combined action of the inorganic composite carbon, not only is the sealing effect ensured, but also the wear resistance and the heat resistance of the product can be effectively enhanced, and the permanent compression resistance of the sealing ring is excellent.