81results about How to "Raw materials are safe and easy to obtain" patented technology

The invention discloses preparation of solid fluorescent carbon dots and application thereof in an aspect of latent fingerprint detection, belongs to the technical fields of material synthesis and fingerprint detection. The solid fluorescent carbon dots are synthesized by adopting glutathione as a nitrogen/sulfur source and adopting citric acid as a carbon source by virtue of a microwave method. Raw materials are safe and easy to obtain, a preparation method is simple and rapid, and particles are safe and nontoxic. The surfaces of the solid fluorescent carbon dots (SFCDs) provided by the invention contain an amino, a sulfydryl and a carboxyl functional group, a particle size is 2 to 7 nm, and the solid fluorescence property is excellent. The SFCDs are used as a fingerprint developing agent and can develop the aged fingerprint, and the developing time can reach 30 days in an experimental range; and the solid fluorescent carbon dots can be applied to a liquid spray method and powder method, the two methods are complementary to each other, and the universality of the developing agent is improved.

The invention discloses a method to prepare the small particle soluble CdSe quantum point. The CdCl and the Se powder are the material which is heated by the ultrasonic water bath. The invention needn't use the glove box and the low cost. The process can be finished in water and not use the regent exchange to transform the quantum point in organic phase to the water phase. The CdSe quantum point has the small particle and good stability, so it can be used in the biological probe and the electrochemical lighting material.

The invention provides a preparation method and an intermediate of pinoxaden. The preparation method includes: using 2-methylacrolein as a raw material; subjecting the raw material to cyclization andaromatization to obtain herbicide-pinoxaden. Compared with the prior art, the preparation method has the distinguishing features and the advantages that a completely different preparation strategy isadopted; a completely different nonaromatic compound is used as the raw material which is safe and easy to obtain; the preparation method is few in three wastes, low in cost and conducive to industrial production.

The invention relates to a method for increasing the yield and the polymerization degree of a polymeric phosphorus-nitrogen intumescent flame retardant, and belongs to the technical field of preparation of polymeric flame retardants. Phosphorus oxychloride, pentaerythritol and a catalyst AlCl3 are uniformly mixed at normal temperature, and a crude intermediate pentaerythritol diphosphate diphosphoryl chloride (SPDPC) is obtained; high-purity SPDPC obtained in the step 1, 4,4-diamino diphenyl sulfone and an acid binding agent are added into an organic solvent, after the materials are stirred and mixed to be uniform, a temperature increasing reaction is conducted in two stages, and the polymeric phosphorus-nitrogen intumescent flame retardant is obtained. In the synthetic process of the method, the reactants serve as a reaction solvent, therefore, the using amount of the solvent is decreased, and the aftertreatment procedure is greatly simplified; meanwhile, reverse precipitation operation and recrystallization operation are conducted on the product, and therefore the purity of the obtained product is high.

The invention discloses a halogen-free flame-retardant wood-plastic composite material and a preparation method thereof. The method comprises mixing and extrusion molding of the raw materials. The raw materials are characterized by comprising plastic, a wood fiber material and a flame retardant. A preparation method of the flame retardant comprises steps of: conducting a first contact reaction on phosphoric acid and pentaerythritol; and adding polyether polyol, ammonium polyphosphate, melamine and / or urea into reaction products from the first contact reaction to conduct a second contact reaction. The halogen-free flame-retardant wood-plastic composite material provided by the invention has good flame retardancy and smoke suppression, improved average ignition time, heat release, smoke production and oxygen index compared with a halogen flame retardant, and no droplet and good flame retardancy. Besides, the halogen free flame-retardant wood-plastic composite material provided by the invention has the appearance of wood, high physical and mechanical properties, wide application range, simple preparation process, and safe and easily available raw materials.

The invention relates to a method for preparing a chitosan fresh-keeping spray, which comprises the following steps: dispersing chitosan with a molecular weight of 50,000-100,000 in an edible gum aqueous solution with a mass percentage of 0.1%-5%, in the aqueous solution the mass ratio of the chitosan to the edible gum being 3:97-10:90; putting the dispersed mixture solution in a working tank of an ultrasonic wave device, turning on the ultrasonic wave device, carrying out ultrasound dispersion treatment; the ultrasound frequency during the ultrasound dispersion treatment being 50-99kHz, a water bath temperature being 30-55 DEG C, and the ultrasound time being 10-40min; standing the mixture solution after the ultrasound treatment, obtaining component A of the chitosan fresh-keeping spray; dispersing glacial acetic acid or citric acid in water, the mass percentage of the glacial acetic acid solution being 0.5%-4% and the mass perdentage of the citric acid aqueous solution being 0.5%-2%, obtaining component B of the chitosan fresh-keeping spray; compounding the component A and the component B according to a volume ratio of 1:2-3:1, and forming the suitable chitosan fresh-keeping spray.

The invention discloses a synthesizing method of a linear polyethyleneimine block copolymer, and belongs to the technical field of macromolecule materials. The synthesizing method comprises the following steps of initiating a cyclic monomer to generate block polymerization by a one-pot two-step method, namely that organic salt is used as an initiator; firstly, initializing an epoxy oxygen-containing ring to generate ring-opening polymerization, so as to form epoxy macromolecule chains; then, initiating an aziridine derivative monomer, and performing block polymerization; after the polymerization is completed, enabling methyl alcohol to terminate reaction; finally, synthesizing the polyethyleneimine block copolymer. The synthesizing method has the advantages that the initiator is organic and environmentally friendly, any metal residue is avoided, and the initiating effect is mild, efficient and quick; the one-pot two-step method is used for block polymerization, so that the operation issimple and convenient, and the synthesizing method is suitable for industrialization amplifying; the feature of activity controllability is realized in the whole polymerizing process, the molecular weight distribution of the product is narrow, and the molecular weight is controllable.

The present invention discloses a konjac bean curd. The konjac bean curd comprises the following effective components in parts by weight: 50-60 parts of konjac flour, 5-6 parts of dietary alkali and 2,500-3,000 parts of pure water, and each of the raw materials is safe and easily obtained. At the same time, the present invention also discloses a handmade method of the konjac bean curd. The dietary alkali and konjac flour are respectively dissolved using different methods, and then the two materials are subjected to a gel reaction to produce the konjac bean curd. The method is simple and easy to realize, and controllable in whole processes, can help people to make the fresh, healthy and assured favorite food by themselves at home without leaving home, and enriches a table life of a majority of ordinary people.

The invention discloses a preparation method of antiviral drug tenofovir disoproxil fumarate intermediate chloromethyl isopropyl carbonate, and belongs to the field of antiviral chemical drugs. The preparation method is characterized in that methyl formate as a raw material is synthesized into chloromethyl chloroformate by an one-kettle method and the chloromethyl chloroformate undergoes an esterification reaction to form chloromethyl isopropyl carbonate. The preparation method is easy for operation, has a low cost and a high yield, realizes high purity of products, and is very suitable for industrialized production.

The invention discloses a load type carbon nano-fiber catalyst and application thereof. The catalyst is obtained by grafting a metal complex of acetylacetone to carbon nano-fiber undergoing the surface oxidation treatment; and the metal complex of acetylacetone is vanadyl acetylacetone or nickel acetylacetone. When the load type carbon nano-fiber catalyst is used for synthesizing styrene cyclic carbonate ester, styrene and carbon dioxide used as raw materials react in a high-pressure reaction kettle in the presence of the load type carbon nano-fiber catalyst, tetrabutyl ammonium bromide, zinc bromide and an oxidant at a temperature of between 80 and 120 DEG C and under a pressure of between 3 and 6.5MPa to obtain the styrene cyclic carbonate ester. The catalyst has the advantages of thoroughly solving the problem of serious three-waste pollution existing in the prior art, facilitating the environmental protection, being easily and conveniently operated, having high reaction yield and low production cost, and having greater implementation and popularization values and social and economic benefits.

The invention discloses an active packing material, a preparation method and application thereof, and belongs to the field of packing materials. The active packing material is prepared mainly through mixing main materials with an adhesive, and carrying out molding, wherein the main materials comprise the following components by mass percent: 30% to 60% of orange peel residues, 5% to 35% of indocalamus leaves, 5% to 30% of phyllostachys edulis and 5% to 25% of licorice extract; and the mass ratio of the main materials to the adhesive is 1 to (0.15 to 5). The preparation method comprises the steps of mixing the orange peel residues, the indocalamus leaves, the phyllostachys edulis and the licorice extract according to the mass percent to obtain the main materials, adding water into the main materials, pulping, and carrying out finish grinding to obtain main material slurry; adding the adhesive into the main material slurry, and stirring till uniform dissolution to obtain a mixture; and carrying out molding on the mixture to obtain the active packing material. The active packing material has antibacterial property, oxidation resistance, water absorption and water-retaining property, is easily decomposed after being discarded, and can be used for storing cold fresh meat.

The invention provides an anticorrosive stoma anti-leaking paste and a preparation method thereof. The anti-leaking paste includes, by weight, 40-60 parts of liquid polyisoprene rubber, 10-35 parts ofkaraya gum, 2-6 parts of inorganic clay, 8-20 parts of glycerol, 0.5-2 parts of 1,2-propylene glycol, 0.5-4 parts of mineral oil, 2-10 parts of sodium polyacrylate, 0.1-1 part of aluminum hydroxide,and 0.2-1 part of citric acid. The anti-leaking paste is almost same as common anti-leaking paste in appearance; once being contacted with body fluid during use, the anti-leaking paste can be instantly slowly cured with complete appearance, so that the anti-leaking paste has stable functions during the use process and also is prolonged in use period.

A perfluoro alkyl alkane preparation method comprises the following steps of: using perfluoroalkyl iodide and alkene as oligomers, performing addition reaction at 80-110 DEG C in the presence of an organic peroxide and a noble metal catalyst, blowing hydrogen in and continuously carrying out a catalytic hydrogenation reaction after the addition reaction, and performing underpressure distillation and purification after the reaction to prepare perfluoro alkyl alkane. The preparation method provided by the invention has the following advantages: the raw materials are safe and easily available; reaction condition is mild; the operation process is continuous and simple; the technology has good security; and the yield of the prepared perfluoro alkyl alkane is 98.2%-98.9% and its purity is 99.1%-99.5%. The invention is beneficial to industrial production.

The invention relates to chitosan hydrogel used for treating and repairing stoma skin and a preparation method thereof. The chitosan hydrogel is composed of, by weight, 70-90 parts of purified water,5-10 parts of glycerin, 0.5-10 parts of chitosan, 0.5-5 parts of organic acid, 1-10 parts of panthenol, 0.1-5 parts of preservative and 1-10 parts of portylaca oleracea extract. The preparation methodincludes the steps that S1, by total weight, 85-95% of the organic acid in a formula is sufficiently dissolved in the purified water to form acidic liquor, glycerin is dissolved in the acidic liquor,and sufficient homogenizing is conducted; S2, under continuous stirring, chitosan is slowly added into a solution obtained in the first step until dissolving is thorough; S3, the preservation, the portylaca oleracea extract and the panthenol are added into a solution obtained in the second step, and sufficient dissolving is conducted; S4, the remaining 5-15% of organic acid is added into a solution in the third step to adjust the pH of the solution to be 5.0-6.0; S5, materials in the fourth step are separately packaged and subjected to irradiation sterilization. The chitosan hydrogel is goodin treatment effect and can effectively relieve skin inflammation of a patient with a stoma and effectively help the patient to heal when the skin of the patient with the stoma has eruptions.

The invention discloses a preparation method of hydrocarbyl fluoroalkyl asymmetric chain carbonate. The preparation method includes adopting a one-pot method, taking aryl carbonate as an ester exchange matrix, and adding fluoroalkane ester under the action of a basic catalyst to carry out a reaction to obtain fluoroalkyl aryl carbonate, adding hydrocarbyl alcohol for reaction, and performing rectification to obtain the hydrocarbyl fluoroalkyl asymmetric chain carbonate. The preparation method has the advantages of simple technological process, easiness in raw material acquisition, high yield and the like; the purity of the obtained hydrocarbyl fluoroalkyl asymmetric chain carbonate is higher than or equal to 99.9%, the moisture thereof is less than or equal to 100ppm, and the yield thereofis higher than or equal to 80%, so that the application requirements of lithium-ion battery electrolyte additives can be met.

The invention discloses a method for preparing fluorescent silica nanoparticles by ultraviolet light radiation, which comprises the following steps of adding a silicon source compound into an aqueous solution of a reducing compound; adding a ligand compound, so that a precursor solution is obtained; and radiating the obtained product under ultraviolet light, so that water soluble fluorescent silica nanoparticles are obtained. The method disclosed by the invention is implemented completely in an aqueous phase, and therefore, the method is safe in operation, fast and convenient, low in toxicity, and safe and easily obtained in raw materials. The obtained fluorescent silica nanoparticles are good in monodispersity, high in fluorescence properties and quantum yield and good in stability, has good water solubility, can be used as fluorescent markers and widely applied to biological detection and analysis, and is expected to be used in related optical industrial productions.

The invention belongs to the technical field of cable materials, particularly relates to a novel fluorine material high-temperature-resistant control cable material and a preparation method thereof, and solves the problems that in the prior art, fluoroplastic raw materials are high in price, the performance of domestic fluoroplastic needs to be improved, and a fluoroplastic cable is difficult in production process, low in production efficiency, large in loss, high in production cost and the like. The novel fluorine material high-temperature-resistant control cable material is prepared from the following raw materials: a novel fluorine material, silicone rubber, vinylmethylsiloxane-dimethylsiloxane trimethylsiloxy terminated copolymer, zinc dibenzyl dithiocarbamate, methyl silicone oil, a filler and a stabilizer. Compared with a traditional fluoroplastic cable, the cable material prepared by the invention is higher in safety, lower in cost, good in elasticity, excellent in comprehensive mechanical property, excellent in electrical property, high in resistivity, good in fireproof and flame-retardant properties, small in smoke amount generated by combustion, and capable of being quickly self-extinguished when being away from fire; and the weather-resistant and high-low temperature-resistant cable has good weather resistance and high-low temperature resistance, and can be used for a long time in an environment of -138 DEG C to +280 DEG C.

The invention relates to a preparation method of silicon-based phosphate. Comprising the following steps: mixing a disilazane compound, a cyclic amine compound A and an organic alkali, carrying out a pre-reaction, adding an inorganic phosphate, and carrying out a mixed reaction to prepare the silicon-based phosphate, the types of the disilazane compound and the cyclic amine compound A are specifically limited. The disilazane compound and the cyclic amine compound A react with the organic base and the inorganic phosphate to prepare the silicon-based phosphate, separation and purification of an intermediate are not needed in the preparation process, one-pot preparation of the silicon-based phosphate can be achieved, the steps are simple and convenient, the method can be carried out under the solvent-free condition, and the method is suitable for industrial production. The preparation method has the advantages of simple process, convenience in operation, avoidance of harm and subsequent treatment problems caused by the use of an organic solvent, no corrosion to equipment, avoidance of the generation of halogen salts by adopting the disilazane compound, and better avoidance of adverse effects on the performance of the battery.