81results about How to "Does not generate corrosive substances" patented technology

The invention relates to a fluorine-containing polyimide humidity-sensitive capacitor and a preparation method thereof. The humidity-sensitive capacitor is composed of a substrate, a lower electrode, a fluorine-containing moisture-sensitive polyimide coating and an upper electrode; wherein, the fluorine-containing Moisture-sensitive polyimide is formed by reacting 2,2-bis(3-amino-4-hydroxyphenyl)hexafluoropropane, aromatic diamine and aromatic dianhydride. The preparation method includes: cleaning the substrate with a cleaning solution, putting it in a drying oven to dry, drying, and then vacuum evaporation to make the lower electrode, JP-6 conductive adhesive to guide the lead wire of the lower electrode, and then spin-coating fluorine-containing moisture-sensitive polyimide Amine precursor solution, imidization, vacuum evaporation to make the upper electrode, sectioning, rinsing with deionized water, drying, screening, surface modification, JP‑6 conductive glue lead the upper electrode lead, and prepare the fluorine-containing polyimide moisture sensitive capacitance. The invention has the advantages of high sensitivity, small hysteresis, simple manufacturing process, low cost, etc., and has good market prospects.

The invention relates to a preparation method of 2,5-bi(2-trifluoromethyl-4-aminophenoxyl)toluene, comprising the steps of adding 2,5-bi(2-trifluoromethyl-4-nitrophenoxyl)toluene, an organic solvent, and a palladium / carbon catalyst in a reaction kettle, heating the reaction kettle, stirring, raising temperature to 70-80 DEG C, dripping a hydrazine hydrate aqueous solution, strictly controlling thedripping time within 1-1.5 hours, reacting for 2-4 hours at 70-80 DEG C after finishing dripping the aqueous solution, filtering when the solution is hot, removing filter residues, maintaining the mother liquid, dripping deionised water into the mother liquid while stirring, putting the mother liquid aside for 5-8 hours, separating out white solid product, filtering, washing and drying to obtain2,5-bi(2-trifluoromethyl-4-aminophenoxyl)toluene solid. The method has a simple technology, low cost, high purity and yield, and is environment-friendly and suitable for commercial production.

The invention relates to a method for preparing 4,4'-bis(4-nitro-2-trifluoromethylphenoxy)diphenylsulfone, which comprises the following steps: adding 4,4'-dihydroxydiphenylsulfone and 2-chloro-5-nitrotrifluoromethylbenzene into a reaction kettle; adding a salt forming agent, strong polar aprotic organic solvent and an organic entrainer, stirring the mixture in the reaction kettle at room temperature for 30 minutes, and heating the mixture for azeotropic water separation reaction for 12 to 15 hours; and filtering the hot solution, removing filter residue, concentrating mother solution, cooling and standing the mother solution to precipitate a milky crystal product, filtering the solution, and washing and drying the milky crystal product to obtain the 4,4'-bis(4-nitro-2-trifluoromethylphenoxy)diphenylsulfone. The preparation method has the advantages that: the operation is simple, the raw material resource is readily available, the cost is low, and no corrosive substance is related to or generated; few kinds of organic solvents are used, and the organic solvents can be used repeatedly and circularly and are environmentally-friendly; and the product has a high yield up to more than 98 percent, a purity up to 99.8 percent and a melting point of from 198.4 to 199.2 DEG C and is suitable for industrial production.

The invention relates to a method to prepare 1,4-bi(2,4-binitro-4-dinitro-phenoxyl) -2,3,5-trimethylbenzene, including the following steps: (1), 2,3,5-trimethyl-hydroquinone and 2,4-binitro-halogenated benzene based on molar ratio of 1.0:2.0-2.2 are heated to reflux and react for 6-18 hours in a system with salt forming agent and organic solvent;(2) after reaction, the solution is concentrated and cooled, and then water is added to separate out the solid product, after that the solution is filtrated, washed and dried, getting 1,4-bi(2,4-binitro-4-dinitro-phenoxyl)-2,3,5-trimethylbenzene crystalloid. The method is simple in operation with high yield and the product is high in purity; the solvent is convenient to recycle and can be used repeatedly; with little wastes(gas, liquid and solid)and being environment-friendly, the method is applicable to industrial production.

The invention relates to a method for preparing 1, 3, 5-three(-2, 4 dinitrophenoxy) benzene, which comprises the steps that: (1) 1, 3, 5-phloroglucin and 2, 4-dinitrohalobenzenes with a molar ratio ranging from 1.0 : 3.0 to 1.0 : 3.2 are subject to a heat refluxing and water diversion reaction for 6 to 18 hours in a system comprising the salt forming agents and organic solvents; (2) the reaction solution is concentrated, the reactant system is cooled and the water is added in the reactant system so as to precipitate the solid product; the obtained solutions are filtered, the obtained productsare washed and dried so as to, obtain 1, 3, 5-three (-2, 4 dinitrophenoxy) benzene. The invention has simple operations and high product yield and purity, the solvents can be conveniently recycled and can be repeatedly used with few wastes, and the invention is environmentally friendly and suitable for industrialized production.

The invention relates to a method for preparing 1, 4-dual (2-trifluoromethyl-4-nitrophenoxy)-2, 5-dual tert-butylbenzene, comprising the steps: (1) 2, 5-dual tert-butylbenzene-1, 4-hydroquinone and 2-chlorine-5-nitryl trifluoromethyl benzene are dissolved into the mixed solvent of salt forming agent, strongly polar aprotic organic solvent and organic entrainer according to the mol ratio of 1.0:2.0-2.4, and heated for azeotropic water diversion reaction for 12-20h; (2) the mixture is filtered in heat, filter residue is removed, master liquor is concentrated and cooled in a static way, and milky yellow crystal product is separated out, filtered, washed and dried to obtain the 1, 4-dual (2-trifluoromethyl-4-nitrophenoxy)-2, 5-dual tert-butylbenzene. The preparation method has simple operation, wide raw material source and low cost, and does not relate to corrosive substance; the using sorts of the organic solvent are less, and the organic solvent can be repeatedly recycled and environment-friendly; furthermore, the yield of the product reaches over 92%, and the purity reaches 99.7%, so that the method is suitable for commercial process.