84results about How to "Low thermal decomposition temperature" patented technology

The invention relates to a preparation method of phosphate modified acrylate emulsion. The preparation method not only has relatively low cost, but also can effectively improve the flame retardation property of polyacrylate emulsion. The preparation method of phosphate modified acrylate emulsion comprises the following steps of: (1) primary polymerization: pre-emulsifying 10-20 parts of methyl methacrylate, 2-3 parts of methacrylic acid, 1-2 parts of acrylonitrile and 10-15 parts of styrene, then performing primary emulsion polymerization, and adjusting the pH value to obtain the primary polymerized emulsion; and (2) secondary polymerization: pre-emulsifying 30-45 parts of hydroxyl methacrylate substance, then adding the pre-emulsified product and 5-10 parts of phosphate monomer into the primary polymerized solution, and performing secondary emulsion polymerization to obtain the phosphate modified acrylate emulsion with a core-shell structure, wherein the phosphate monomer is trichloroethyl phosphate, trichloropropyl phosphate or n-ethyl phosphate; the molecular weight of polymer in the obtained phosphate modified acrylate emulsion is 2000-3000; and the particle size is 0.2-0.6 mum.

The invention relates to a water-based adhesive and a preparation method and applications thereof. The water-based adhesive comprises the following components in percentage by weight: 1-8% of acrylic acid or methacrylic acid, 5-20% of methyl methacrylate, 10-40% of acrylic ester, 0.5-5% of compounded emulsifier, 0.1-0.5% of initiator and 40-80% of deionized water. The preparation method comprises the following steps of: A. firstly dissolving the emulsifier in water, and then adding the acrylic acid or the methacrylic acid, the methyl methacrylate and the acrylic ester to the emulsifier solution for preemulsification; B. pouring 1/4-1/3 of the emulsified liquid in Step A in a reaction kettle, stirring and heating to 65-75 DEG C, adding the initiator solution, and reacting until the solution is transparent; and C. heating the solution in Step B for synthetic reaction, gradually dropping the remaining emulsified liquid to the reaction system, adding the remaining initiator solution after dropping, and adjusting the pH value. The adhesive is applied to MLCC capacitors and has the advantages of low cost, good performance and good environmental friendliness.

The invention discloses a method for preparing vinyl chloride by hydrochlorinating acetylene through using a quaternary phosphonium long-chain ionic liquid as a medium. The method comprises the following steps: dissolving a catalyst in a quaternary phosphonium long-chain anion functional ionic liquid medium to prepare a catalysis system, activating the catalysis system by introducing hydrogen chloride in advance, and introducing acetylene and hydrogen chloride to carry out a reaction. The method using the ionic liquid as the reaction medium and a mercury-free compound as the catalyst realizes the green and environmentally-friendly liquid phase reaction of acetylene hydrochlorination, has a very good catalysis efficiency, and makes the acetylene conversion rate reach 80-98% and the vinyl chloride selectivity reach above 99.5%.

The invention provides a method for preparing a composed calcined dolomite by taking the byproduct of brine ( a saturated liquor which is mainly magnesium chloride ) after potassium extraction or the bischofite separated out from the brine by naturally evaporating as the materials to react with excess lime to prepare the floccule mixture of magnesium hydrate and calcium hydroxide; then the mixture is calcined and dehydrated under the temperature of 400 to 1200 DEG C after the mixture is deposited, filtered, washed, dried and cracked. The materials of the invention are easily obtained and cheap; the production process is simply and easily controlled; no carbon dioxide is discharged; besides, the invention basically has no corrosion to a device. The mol ratio of MgO to CaO in the composed calcined dolomite is within the range of 1:0.8 to 1:1.2; the activity of water is 25 to 36 percent; the composed calcined dolomite is applicable for the areas rich in the resource of magnesium chloride to use a Pidgeon process to produce the metal of magnesium.

The invention provides a tobacco flavor and a preparation method thereof, the tobacco flavor comprises solid acid and glucoside, and the weight ratio of the solid acid to the glucoside is 1: 5-1: 1000. Furthermore, the invention also provides application of the tobacco flavor as a flavor substance in low-temperature cigarettes. In the tobacco flavor, the solid acid is used as a catalyst, so that the thermal decomposition temperature of glycoside substances can be obviously reduced, the tobacco flavor is particularly suitable for low-temperature cigarettes, the flavor substances are not volatilized or lost in a normal-temperature state, and even if the low-temperature cigarettes are stored for a long time, the aroma is still lasting and stable during smoking.

The invention discloses a special polyvinyl alcohol thin film for fruit and vegetable packaging. The special polyvinyl alcohol thin film comprises the following raw materials in part by weight: 100 parts of polyvinyl alcohol, 10-25 parts of starch, 5-13 parts of gelatin, 2-4.8 parts of montmorillonite, 1-3 parts of activated carbon, 0.5-2 parts of zeolite, 3-5.6 parts of modified alumina, 0.5-2 parts of nanometer silicon dioxide, 0.3-2 parts of chitosan quaternary ammonium salt, 2-8 parts of plant extract, 1-5 parts of spirulina, 0.01-0.09 part of antioxidant, 2-8 parts of retinervus luffae fructus, 2-8 parts of retinervus luffae fructus, 0.3-0.8 part of plant essential oil, 0.2-0.85 part of glutamine transaminase and 0.01-0.1 part of antibacterial peptide . The special polyvinyl alcohol thin film for fruit and vegetable packaging, disclosed by the invention, is excellent in antibacterial property, high in strength, low in moisture permeability and excellent in heat and weather resistance, is used for keeping fruits and vegetables fresh, is good in antibacterial and anti-mildew properties and can prolong the shelf lives of the fruits and the vegetables.

The invention discloses a preparation method of an environment-friendly casting binder, which relates to an improvement of a casting binder, and provides the preparation method of an environment-friendly casting binder that does not discharge noxious and harmful gases in the producing and using process. The preparation method of the environment-friendly casting binder adopts the technical proposal which comprises animal glue, fatty acid, alcohol, an anti-gelling agent and a catalyst with the content of each component by weight is: 30 to 60 units of animal glue, 20 to 40 units of fatty acid (or C12-C18 organic acid), 10 to 20 units of alcohol, 10 to 20 units of anti-gelling agent, 1 to 2 units of mineral acid catalyst and the remaining of water.

The invention relates to a preparation method for noble metal modified titanium anode materials, belonging to the technical field of high-performance electrode materials. The preparation method for noble metal modified titanium anode materials comprises the following steps of: taking noble metal organic complex as a precursor; atomizing the precursor into atomizing flow after being dissolved in organic solvent; depositing the precursor on the surface of a titanium sheet; thermally decomposing and cooling under the existence of inertia gas; repeating three continuous steps of depositing, thermally decomposing and cooling for at least once; and carrying out aftertreatment, so as to obtain the noble metal modified titanium anode materials. The titanium anode prepared by the method has high yield and less surface exposed point; the noble metal and pure titanium base material have high binding force; and the whole coating has better homogeneity and uniformity. Experiments show that the titanium anode prepared by the method has better electrochemical performance and long service life.

The invention discloses a preparation method of a porous carbon material. The preparation method comprises the following steps: stirring and mixing chlorinated polyvinyl chloride, alkali metal hydroxides and methacrylate copolymers in parts by weight, and extruding at the temperature of 190-210 DEG C to obtain a granulating material; then increasing the temperature of the granulating material from 25 DEG C to 800-900 DEG C in an inert gas atmosphere at two-stage heating rate for carbonization, and then reducing the temperature to 25 DEG C at the cooling rate of 20-40 DEG C/min to obtain a carbonized material; then immersing the carbonized material into an aromatic substance for 2-4 hours, then increasing the temperature from 25 DEG C to 900-1000 DEG C in the inert gas atmosphere at the two-stage heating rate, keeping constant temperature for 3-4 hours, and then reducing the temperature to 25 DEG C at the cooling rate of 15-30 DEG C/min to obtain the porous carbon material. The preparation method disclosed by the invention has the advantages of simple process, environmental protection, easiness for industrialization and stability in product property.

The invention discloses a method for recycling a polyvinyl chloride wood-plastic composites waste. The method includes following steps: (1) according to certain weight parts, mixing a crushed polyvinyl chloride wood-plastic composites waste, a carbonate or bicarbonate of alkali metals, and a plasticizer with stirring under a certain rotate speed, and performing extrusion at 170-200 DEG C to obtain a granulated material; (2) under an inert gas atmosphere, increasing a temperature from 25 DEG C to 700-750 DEG C with a two-stage temperature-increasing speed for performing carbonization, and decreasing the temperature to 25 DEG C with a temperature decreasing speed of 5-10 (DEG C)/min to obtain a carbonized material; soaking the carbonized material in an aromatic compound for 0.1-1 hour, taking out the carbonized material, under the inert gas atmosphere, increasing a temperature from 25 DEG C to 850-950 DEG C with a two-stage temperature-increasing speed, maintaining the temperature for 1-2 hours, and decreasing the temperature to 25 DEG C with a temperature decreasing speed of 15-20 (DEG C)/min to obtain a porous carbon material. The method is simple in technology, is green and environmental-protective, is low in cost and is good in economic benefit.

The invention relates to a double in-situ synthesis method of temperature-responsive nano silver composite hydrogel. By adopting an ultraviolet radiation method, under a condition without an initiator and a reducing agent, with dimethylaminoethyl methacrylate and 2-acrylamide-2-methylpropanesulfonic acid as monomers, N,N'-methylene bisacrylamide as a cross-linking agent, polyethylene glycol 400 as a pore forming agent, and silver nitrate as a metal source, and under a nitrogen atmosphere, the temperature-responsive nano Ag/P(DMAEMA-g-AMPS) composite hydrogel is synthesized. The prepared nano silver composite hydrogel has uniform dispersed nano silver particles and good chemical cross-linking stability, allows the swelling degree to be increased by 294.8 compared with that of pure water gel, and improves water absorbency and water retention of the hydrogel; the composite hydrogel allows temperature responsiveness to be enhanced, thereby being beneficial for medical drug release and other applications; and the composite hydrogel allows the thermal decomposition temperature to be decreased by 78 DEG C compared with that of pure hydrogel, thereby being beneficial for polymer waste post-processing.

The invention discloses a loaded type catalyst for catalyzing and decomposing phosphine to prepare elemental phosphorus, which takes a carbon nano tube as carrier and forms Co-P/CNTs amorphous alloy together with Co and P. A method for preparing the loaded type catalyst comprises: water-soluble cobalt salt, sodium citrate, sodium hypophosphite and ammonium sulphate are dissolved in de-ionized water and then added with the carbon nano tube which is purified and functionalized, and is steeped by the cobalt salt; the pH of the reaction liquid is adjusted to be about 9 by using ammonia water; under the condition of 80-90 DEG C, the reaction liquid is added with potassium borohydride for initiation and then fully stirred, so that black precipitate is produced in the reaction; after being separated, the precipitate is respectively washed by the de-ionized water and absolute ethyl alcohol, and then put into the absolute ethyl alcohol to be saved. The invention has the advantages that the carbon nano tube (CNTs) is adopted as the carrier to prepare the Co-P/CNTs amorphous alloy which is taken as catalyst for pyrolyzing the phosphine, decomposition temperature is low, and the catalytic activity and the thermal stability are good.

The invention discloses a preparation method of flame-retardant super-fine wool fabric. The preparation method comprises the following three steps: oxidizing sodium alginate, finishing fabric with oxidized sodium alginate and performing ion exchange. In the preparation method of the flame-retardant super-fine wool fabric, multi-aldehyde sodium alginate is adopted as a finishing agent for film formation on the surfaces of fibers, and the sodium alginate covered on the surfaces of the fibers are used for isolating air and heat, so that char formation is promoted, water vapor is vaporized by absorption of heat, and the thermal decomposition temperature is lowered accordingly; in addition, the step that the sodium alginate is heated is earlier than the step of decomposition of wool, so that the temperature on the surface of the fabric is lowered while heat is absorbed and the flame retardant effect is achieved finally.

The invention discloses a preparation method of a modified activated carbon material for a capacitor. The preparation method comprises the following steps: (1) polishing, drying and crushing a carbonsource; (2) activating the raw materials through a phosphoric acid solution to obtain a primary activated product; (3) mixing the precursor powder with the primary activation product, and activating with potassium hydroxide to obtain a secondary activation product; and (4) adding the secondary activation product into a saturated lead nitrate solution, carrying out ultrasonic dispersion, stirring and performing vacuum filtration to obtain a filter cake, and carrying out heat treatment to obtain the material. The preparation method of the activated carbon is simple; the preparation method is simple in process, wide in raw material source and suitable for large-scale production, a secondary activation process is adopted in the preparation process, precursor powder with high content of heteroatoms such as nitrogen and oxygen is added into the activated carbon, the specific surface area is further increased, micropores are enriched in the surface, the specific capacitance of the material isimproved, and the use performance of the material is enhanced.

The invention discloses an inflaming retarding aerosis polyamide arc extinguishing composite material which is prepared from the following raw materials in percentage by weight: 20.0-85.0% of polyamide, 5.0-25.0% of polyamide prepolymer, 5.0-15.0% of arc-quenching metallic compound, 0.0-15.0% of arc-quenching water absorbing compound, 10.0-20.0% of arc-quenching aerosis inflaming retarding compound, 0.5-2.0% of an aerosis accelerator and 0.0-5.0% of a processing aid. The inflaming retarding aerosis polyamide arc extinguishing composite material not only has a good inflaming retarding property but also can generate gas to assist arc extinction, has an excellent mechanical property, and is especially suitable for preparing miniature circuit breakers. The invention also provides a method for preparing the inflaming retarding aerosis polyamide arc extinguishing composite material. The method can be realized by adopting an existing twin-screw extruder; the preparation is simple and liable to industrial mass production, with broad application prospects.

The invention discloses a method for preparing a superhydrophobic oxidant based on lotus effect. The method comprises the following steps: adding a low-surface-energy material into a solvent, then adding oxidant particles, and carrying out stirring, filtering and drying successively; and adding the oxidant particles modified by the low-surface-energy material into a metal salt solution, and carrying out filtering and drying after a sufficient reaction so as to obtain superhydrophobic oxidant particles. According to the invention, the principles of bionic superhydrophobicity are employed for surface treatment of the oxidant prone to moisture absorption, so the moisture absorption rate of the oxidant is significantly reduced, and in particular, under the conditions of a temperature of 60 DEGC, a relative humidity of 80% and test time of 400 hours, the moisture absorption rate of ADN is lowered by about 53%, and the superhydrophobic oxidant can be placed in the air for 6 months without any agglomeration; and an utilized coating material assists in the realization of moisture absorption prevention performance of the oxidant, and a metal salt in the coating material can significantly reduce the thermal decomposition temperature of the oxidant, which is of important significance to the application of the oxidant to high-burning-rate solid propellants.

The present invention relates to VO ₂ A preparation method of nano powder and its dopant nano powder. The method uses V ₂ o ₅ Reduction of VOCl ₂ solution, followed by VOCl ₂ The solution is made into vanadyl (IV) basic ammonium carbonate precursor, and the precursor is thermally decomposed to obtain VO ₂ Nano powder and its dopant nano powder. The invention has the advantages of simple process, low energy consumption, low investment, low cost, and is convenient for large-scale production, and the nano-ceramic prepared by using the obtained nano-powder has high strength and good thermoelectric performance.

The invention discloses a preparation method of a titanium plate loaded palladium nanoparticle catalyst. A titanium plate is taken as a carrier, palladium chloride is taken as a precursor, gel is formed by adding oleic acid or oleate and is then evenly sprayed on the titanium plate, and the titanium plate loaded palladium nanoparticle catalyst is obtained by insulation treatment under the 180-350DEG C gas protection for 0.5-2 hours. Compared with a traditional thermal decomposition method, the preparation method has the advantages that thermal decomposition temperature can be remarkably reduced, obtained Pd particles are uniform in particle, the average particle diameter is smaller than 10nm, the Pd particles can be uniformly dispersed on the titanium plate, high catalytic activity on alcohol fuels of ethyl alcohol, methyl alcohol and the like is achieved, raw materials are easy to obtain, simpleness in operation method is achieved, and requirements of industrialization production can be reached.