83 results about "Dicyanamide" patented technology

The invention relates to a quick, energy-saving and high-yield preparation method of quasi-graphite-structure carbon nitride catalysis materials and application of the materials, belonging to the field of preparation and application of catalysis materials. According to the preparation process, one or multiple nitrogen-rich small organic molecules of urea, melamine, thiourea, cyanamide, dicyanamide, cyanuric chloride and cyanuric acid is / are taken as raw materials, a simple metal substance, a metallic oxide, a metal sulfide and a metal chloride are taken as microwave absorbers, microwave is taken as a heating source, and under the condition of radiation of microwave, the quasi-graphite-structure carbon nitride material can be quickly prepared. The prepared carbon nitride material has a large specific area and crystallinity and has high photocatalytic water decomposition hydrogen production performance and organic pollutant degradation performance. The preparation method provided by the invention is short in time, small in energy consumption, high in production efficiency and simple in process, does not have harsh preparation conditions, is easy to operate and has wide application prospect.

The invention discloses a novel water soluble natural polysaccharide antibacterial material. The molecules of the novel water soluble natural polysaccharide antibacterial material not only have guanidyl but also have amino acid groups, so that the biosafety of the novel water soluble natural polysaccharide antibacterial material is considered while the antibacterial property of chitosan is improved, and the novel water soluble natural polysaccharide antibacterial material is small in cytotoxicity and is a green antibacterial product. The invention also discloses a method of preparing the material. The method comprises the following steps: 1) dissolving chitosan in a diluted acid solution to obtain a diluted acid aqueous solution of chitosan; 2) adding cyanamide or dicyanamide into the diluted acid solution of chitosan for reaction; 3) adding an amino acid activated solution into a reaction system in the step 2) for amidation; 4) adding hydroxylamine hydrochloride for terminating reaction; and 5) dialyzing a reaction liquid which is filtered with deionized water, and performing microwave vacuum drying treatment to obtain the novel water soluble natural polysaccharide antibacterial material. The novel water soluble natural polysaccharide antibacterial material can be prepared in a reaction kettle by a primary reaction, and the used primary raw materials are rich in source and low in price and are suitable for industrial production.

The invention discloses a synthesizing method of polyimide. The method comprises the following step that: an aromatic diamine compound and an aromatic dianhydride compound are subject to a polymerization reaction in an ionic liquid, such that polyimide is obtained. The ionic liquid can be any one of 1-ethyl-3-methylimidazolium tetrafluoroborate, 1-ethyl-3-methylimidazolium acetate, 1-ethyl-3-methylimidazolium dicyanamide, 1-butyl-3-methylimidazolium tetrafluoroborate, 1-butyl-3-methylimidazolium hexafluorophosphate, 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide, and 1-butyl-3-methylimidazolium trifluoromethanesulfonate. The operation of the method is simple, the product made with the method is easy to purify and has high dissolvability (the product can be dissolved in regular solvents of N, N-dimethylacetamide, or tetrahydrofuran). The method has advantages of high yield, stable performance, good application prospect, and is suitable for industrialized production. Withthe method, polyimide films or fibers can be produced.

A developing member that can prevent bleed under a high temperature and high humidity and prevent charge up of the developing member under a low temperature and low humidity is provided. A developing member including an electro-conductive substrate and an elastic layer disposed on the electro-conductive substrate; the elastic layer including a binder resin, an anion and a particle containing a metal, oxide; the binder resin including a resin having a cationic organic group in the polymer chain; the anion being at least one selected from the group consisting of a fluorinated sulfonate anion, a fluorinated carboxylate anion, a fluorinated sulfonylimide anion, a fluorinated sulfonylmethide anion, a dicyanamide anion, a fluorinated alkylfluoroborate anion, a fluorinated phosphate anion, a fluorinated antimonate anion, a fluorinated arsenate anion and a bis(oxalate)borate anion; the metal oxide including an oxide of a metal having an electronegativity of 11.0 or less as a metal ion.

The invention relates to a method for preparing nitrogen-functionalized hollow mesoporous carbon nanosphere. Ammonia water, water, ethyl alcohol, resorcinol, a formaldehyde solution and tetrapropoxysilane are taken according to a mass fraction quantity of 1: 3.7: 20.5: 0.059: 0.22 to 0.66: 0.50 to 1.5; the ammonia water, the water, the ethyl alcohol, and the tetrapropoxysilane are fixed and stirring is carried out, reaction is carried out for 15 minutes at a temperature of 30 DEG C, the resorcinol and the formaldehyde solution are added and stirring is carried out continuously for 24h, hydro-thermal treatment is carried out for 24 hours at a temperature of 100 DEG C, so that a polymer nanosphere including SiO2 nano particles is obtained; the polymer nanosphere is processed by carbonization at a temperature of 600 to 900 DEG C, a SiO2 template is removed by using a NaOH solution to obtain a hollow mesoporous carbon nanosphere; ionic liquid 1-ethyl-3methylimidazolium dicyanamide and the hollow mesoporous carbon nanosphere are fixed and then carbonization is carried out again at a temperature of 700 DEG C, so that a nitrogen-functionalized hollow mesoporous carbon nanosphere is prepared. According to the method provided by the invention, the prepared nitrogen-functionalized hollow mesoporous carbon nanosphere has advantages of having high specific surface area, nitrogen functional group, hollow structure, mesoporous channel and spherical geometrical morphology; and when the nitrogen-functionalized hollow mesoporous carbon nanosphere is used as a super capacitor electrode, the excellent electrochemical performance is realized.

The invention discloses a method for preparing polyhexamethylene biguanidine hydrochloride. Dicyanamide and triethylene diamine are used as raw materials, and water is used as an initiator; and an intermediate product generated by polymerization is continuously reacted and polymerized with hydrochloric acid to generate the polyhexamethylene biguanidine hydrochloride. The polyhexamethylene biguanidine hydrochloride has the characteristics of excellent sterilization effect, no toxicity or harm, simple process and low cost.

The invention discloses a preparation method and use of crystal phase carbon nitride nano-particles and belongs to the field of material preparation. The preparation method comprises calcinating cyanamide, dicyanamide, tricyanamide, thiocyanamide, thiourea and urea as precursors to obtain bulk carbon nitride, mixing the bulk carbon nitride and a molten salt, calcinating the mixture to obtain crystal phase carbon nitride, removing the molten salt, and carrying out alkali solution reflux treatment to obtain the crystal phase carbon nitride nano-particles. The carbon nitride nano-particles are crystals, have nanometer particle sizes, and can be uniformly distributed and stable in the aqueous solution. The preparation method has simple processes, realizes a low cost, satisfies the actual production needs and has great application potential in nano-materials, solar cells, sensors, bio-imaging and thin film device manufacture.

The invention provides a preparation method of an antimony / nitrogen-doped carbon compound by taking 1-ethyl-3-methylimidazole dicyanamide as a carbon source. The preparation method comprises the steps of dissolving antimony trichloride and 1-ethyl-3-methylimidazole dicyanamide into methyl alcohol separately, mixing under strong stirring to enable the two kinds of solutions to be fully mixed and then standing, next, performing centrifuging and collecting gel-shaped white solid body, and performing centrifuging and washing by methyl alcohol; and performing carbonization on the obtained product in H<2> / Ar atmosphere to obtain the antimony / nitrogen-doped carbon compound. The invention also provides the antimony / nitrogen-doped carbon compound prepared by the method and an application of the compound as a negative electrode material of a sodium ion battery. Antimony trichloride, ionic liquid and 1-ethyl-3-methylimidazole dicyanamide ionic liquid are taken as the raw materials, and simple process, green and environment friendly raw materials, and batch production are realized favorably; and the prepared antimony / nitrogen-doped carbon compound has excellent electrochemical performance, and can be used as the ideal negative electrode material of the sodium ion battery to replace hard carbon with low reversible capacity to be applied to the sodium ion battery.

The invention discloses self-adhesive paint for silicon steel sheets of a high-voltage motor iron core, and a preparation method of the self-adhesive paint, and belongs to the field of metal surface paint. The self-adhesive paint is prepared by the following steps: adding 10-40% of water-soluble acrylic resin, 1-8% of dicyanamide, 1-7% of ethelene glycol monophenyl ether, 2-14% of inorganic filling material, 1.5-3.5% of dimethylethanolamine, 0.2-0.9% of fatty acid polyglycol ester and 0.1-0.4% of alkynediols surfactant into purified water in sequence, and stirring for 5-30 min; then conducting sand grinding until the particle diameter D50 of pulp is 0.5-1.5 micrometers; stirring while adding 25-65% of water-borne epoxy resin into the ground pulp, stirring for 10-60 min, screening, discharging, adding purified water into material discharged from a screen mesh, and stirring for 10-20 min so as to obtain the self-adhesive paint.

The invention relates to a method for electrodepositing palladium from an ionic liquid. The method is characterized in that an ionic liquid containing PdCl2 is utilized as an electrolyte, and a palladium element is directly obtained on a cathode in a constant current electrodeposition mode at a low temperature (25-70DEG C). The cation of the ionic liquid used in the invention is a 1,3-dialkyl substituted imidazole ionic liquid, and concretely is a 1-ethyl-3-methylimidazolium cation [EMIm]<+> having a low viscosity and a good conductivity at normal temperature, and the anion of the ionic liquid is trifluoroacetate (CF3COO<->), trifluoromethanesulfonate (CF3SO3<->), dicyanamide (DCA<->), ethylsulfate (C2H5SO4<->) and hexafluorophosphate (PF6<->). The cation is combined with one or more anions to form a substance, and the substance can be used as a PdCl2 solvent and an electrolyte. The method has the advantages of simple operation and low apparatus cost, and the electrolytic medium ionic liquid has the advantages of wide electrochemical window, good thermal stability, wide difference between a solidifying point and a boiling point and the like, so environment pollution caused by the inflammableness and the volatility of a common organic solvent is avoided.

Provided is a hypergolic bipropellant formed by combining a IL fuel having a dicyanamide anion and a nitrogen-containing, heterocyclic-based cation with an oxidizer for such fuel.

The invention discloses a peanut special fertilizer additive resistant to plant diseases and insect pests. The peanut special fertilizer additive is prepared from the following raw materials in parts by weight: 20-25 parts of peanut shell, 4-5 parts of clay, 0.3-0.5 part of polypropylene glycol, 1-2 parts of an EM microbial agent, 2-4 parts of banana peel, 3-5 parts of watermelon peel, 3-5 parts of pine needle, 1.5-1.8 parts of soybean pod, 1-1.5 parts of compound sodium nitrophenolate, 2-4 parts of sweet potato seedling, 3-5 parts of plantain, 1.8-2.2 parts of honeysuckle, 1-1.5 parts of stellera chamaejasme, 0.3-0.4 part of malic acid, 1-2 parts of dicyanamide, 1-4 parts of soluble chitosan, 1-2 parts of lecithine, 0.2-0.4 part of fatty acid, and 1-2 parts of sodium doodecyl benzene sulfonate. According to the invention, the clay has greater specific surface area and pore volume, and has special adsorbability and the ion exchange performance, and the clay is applied into soil to cooperate with the malic acid, biochar and the like through the utilization of the properties to achieve the synergistic effect, so that the soil environment is remarkably improved, the soil pollution degree is reduced, and the heavy metal ions are adsorbed.

The invention relates to nickel-filled nitrogen-doped carbon nanotubes as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) adding nickelchloride and a carbon and nitrogen source into a dispersant, uniformly stirring, performing ultrasonic treatment, drying and grinding to obtain mixed powder, wherein the carbon and nitrogen source isone or more of tripolycyanamide, dicyanamide and cyanamide; (2) calcining the mixed powder obtained in the step 1 in an inert gas atmosphere, and then performing acid treatment to obtain the nickel-filled nitrogen-doped carbon nanotubes. The invention further provides the nickel-filled nitrogen-doped according to the preparation method and application of the carbon nanotubes. According to the preparation method, the nickel-filled nitrogen-doped carbon nanotubes are prepared through groundbreaking simple high-temperature pyrolysis of a mixture of the nickel chloride and the carbon and nitrogensource; compared with a single nickel-filled carbon nanotube preparation method, the preparation method provided by the invention has the advantages as follows: the filling rate of nickel is greatly improved, and doping of nitrogen also greatly improves the electrochemical performance of the carbon nanotubes; the nickel-filled nitrogen-doped carbon nanotubes have a wide application prospect.

The invention discloses a fire retardant containing flame retardant synergistic combinations and a preparation method thereof, wherein the fire retardant containing flame retardant synergistic combinations comprises raw materials with part by weight: organic waste silicone rubber 20-40 parts, cyanurtriamide and / or dicyanamide 10-20 parts, silane coupling agent 1-5 parts, alkali 5-15 parts, alcohol 80-120 parts, water 30-50 parts and flame retardant synergistic combinations 1-10 part, the flame retardant synergistic combinations comprise components with part by weight: carbon nano tube 4-6 parts, nano-mesoporous molecular sieves 4-6 parts, polyether modified silicone 1-3 parts and nano-sized aluminum nitride 1-3 parts. The fire retardant containing flame retardant synergistic combinations and the preparation method thereof are excellent in hydrophobic property, can obviously improve flame retardant performance of polypropylene, achieve UL-94V-0 flame retardant performance, and can achieve above 39% limit oxygen index. Furthermore, the fire retardant containing flame retardant synergistic combinations and the preparation method thereof further can obviously improve the smoking situations and dripping situations when the polypropylene is burnt and mechanical properties of materials (tensile strength, bending strength and impact strength).

The invention relates to a method for separating acetone and methyl alcohol by extractive distillation of ionic liquid. Acetone and methyl alcohol can form binary azeotrope which is difficult to separate by a conventional method. According to the method, acetone and methyl alcohol azeotrope is separated by using 1-ethyl-3-methylimidazolium dicyanamide ionic liquid as an extracting agent in an extractive distillation mode with a normal-pressure extractive distillation tower, a flash tank and a stripping tower only, along with simple process, low equipment cost, little extracting agent dosage and high product purity. The method adopts the ionic liquid with high boiling point, low steaming pressure, proper viscosity, low evaporation rate and easy recycling as the extracting agent, the composition of binary azeotrope of acetone and methyl alcohol can be broken through, and the method can be used for recycling acetone and methyl alcohol in industrial application.

The invention discloses a technology for separating an ethyl alcohol-water system by means of extractive distillation and flash coupling. The technology comprises the steps that ionic liquid is adopted as an extracting agent, the relative volatility of ethyl alcohol for water can be improved, and the separating efficiency can be improved to obtain an ethyl alcohol product, wherein the ionic liquid is 1-ethyl-3-methylimidazolium tetrafluoroborate and 1-ethyl-3-methylimidazolium dicyanamide. The adopted ionic liquid extracting agent can improve the relative volatility of ethyl alcohol in the ethyl alcohol-water system, and the solvent ratio is decreased. The ethyl alcohol with the purity larger than 99.9% is obtained. According to the technological process for separating ethyl alcohol-water by means of extractive distillation and flash coupling, the stable and continuous ionic liquid can be recycled.

The invention discloses a pre-dispersed master batch particle for rubber foaming and a preparation method of the pre-dispersed master batch particle. The pre-dispersed master batch particle comprises, by weight, 30-50 parts of azodicarbonamide, 20-30 parts of N, N'-dinitrosopentamethylene tetraamine, 1-3 parts of dicyanamide, 3-10 parts of coupling agents, 3-10 parts of inorganic fillers, 5-10 parts of softening oil, 2-5 parts of processing agents and 5-40 parts of ethylene propylene diene monomer rubber. By the preparation method of the pre-dispersed master batch particle, dispersity of active components is improved, the master batch particle is uniformly discharged, the surface of the particle is smooth, the master batch particle has fine processing performance and is used for preparing rubber materials, and the foaming effect of the rubber materials is improved.

The invention belongs to the technical field of coatings, in particular to a solvent-free single-component polyurethane waterproof coating. The coating is prepared from the following components in parts by weight: 30 to 60 parts of mixed polyether polyol; 5 to 15 parts of diphenylmethane diisocyanate; 7 to 15 parts of hexamethylene diisocyanate, 10 to 24 parts of glycerol triacetate, 8 to 16 partsof acetyl tributyl citrate, 3 to 8 parts of 1-butyl-3-methylimidazolium dicyandiamide salt, 20 to 50 parts of calcium oxide, 10 to 30 parts of titanium dioxide, 1 to 3 parts of single-layer grapheneand 0.2 to 1 part of dibutyltin dilaurate catalyst. The coating has the following beneficial effects: (1) the viscosity of the coating system is improved through the combination of mixed ethers and the adjustment of a plasticizer, so that the purpose of easy film scraping and brushing is achieved, no solvent is added, the coating is more environment-friendly, and the construction is more convenient; (2) the prepared coating is low in water content and long in storage life; and (3) the coating is strong in mechanical property, smooth in surface after construction and more attractive.

The invention relates to the technical field of sodium dicyanamide synthesis, and specifically discloses a continuous preparation method of sodium dicyanamide. The continuous preparation method comprises the following steps: mixing ammonium hydroxide and halogeno-cyanogen at the temperature of 0 to 20 DEG C in a pre-reactor to obtain a mixed material; providing a reactor, and transferring the mixed material to a reaction kettle of the reactor, wherein the reactor is provided with the reaction kettle, a condensing tube reactor and a liquid-alkali storage tank which are communicated with one another; pumping the mixed material and a sodium hydroxide solution into the condensing tube reactor, adjusting the pH value of the mixed material, meanwhile introducing halogeno-cyanogen into the condensing tube reactor, making reaction liquid flow through the condensing tube reactor and drop back into the reaction kettle, and carrying out the next step when the pH value of the reaction liquid is stabilized at 7.5 to 10; repeating the circular reaction steps to prepare the sodium dicyanamide. The continuous preparation method is easy to operate, is 80 percent or more in yield, is 98 percent oremore in product content, is stable in product quality, and is suitable for industrial production.

The invention relates to the field of pesticide detection, and aims at providing an LC-MS detection method for simultaneous determination of 34 pesticide residues in fruits and vegetables to achieve simultaneous analysis of the 34 pesticide residues without using multiple detection methods and to meet the requirements for rapid and efficient detection work. The invention also provides a sample pretreatment method for detecting the pesticide residues in the fruits and the vegetables, and the method has the advantages of spending little time and having a good extraction effect. According to thetechnical scheme, an extracting agent for sample pretreatment for detecting the pesticide residues in the fruits and the vegetables comprises, by weight, 0-8 parts of acetonitrile, 0-5 parts of acetone and 0-3 parts of 1-butyl-3-methylimidazol dicyanamide salt; the rapid detection method for the simultaneous determination of the 34 pesticide residues in the fruits and the vegetables includes the following steps of making a standard curve and detecting samples to be detected.

The invention provides a preparation method of an antimony / nitrogen doped graphene compound, and an obtained composite material and an application of the composite material as a negative electrode material of a sodium ion battery. The preparation method comprises the following steps of 1) performing ball milling and mixing on graphene oxide, 1-ethyl-3-methylimidazole dicyanamide and antimony powder; 2) taking out the ball milled mixture, and enabling the mixture to be dispersed into distilling water, and performing ultrasonic dispersion and uniformizing and freezing and drying; and 3) performing carbonization on the product obtained in the step 2) in H<2> / Ar atmosphere to obtain the antimony / nitrogen doped graphene compound. Compared with the prior art, the method disclosed in the invention is simple in process, the used raw materials are green and environment friendly, the method is suitable for batch production, and the prepared antimony / nitrogen doped graphene compound has excellentelectrochemical performance and can be used as an ideal negative electrode material of the sodium ion battery to replace pure antimony of low reversible capacity to be applied to the sodium ion battery, so that that antimony / nitrogen doped graphene compound is a promising negative electrode material of the sodium ion battery.

The invention discloses a carbon nitride (g-C3N4) nanosheet-based photocatalytic composite membrane and a preparation method and application thereof, and belongs to the technical field of photocatalysis and water treatment. The preparation method comprises the following steps: preparing g-C3N4 nanosheets from dicyandiamide and ammonium chloride, mixing a dispersion liquid of the g-C3N4 nanosheetswith a high polymer material chloromethylated polyethersulfone (CMPES) to prepare a membrane liquid, and carrying out phase inversion to obtain the g-C3N4 nanosheet-based photocatalytic composite membrane. As a composite water treatment technology integrating membrane separation and photocatalysis self-cleaning, the obtained photocatalysis composite membrane has the characteristics of environmental friendliness, low operation cost and high water treatment efficiency, has high pollutant interception and removal rate, good stability and strong anti-pollution performance, and has a wide application prospect in the field of water treatment.

The invention provides a method for deeply desulfurizing oil based on a low viscosity ionic liquid. According to the invention, the low viscosity imidazole dicyanamide salt ionic liquid is used as an extractant for removing heterocyclic sulfur compounds from the oil. Compared with the traditional desulfurizing methods with ion liquid extraction, the method provided by the invention has mild desulphurization conditions, low desulphurization temperature and quick desulphurization speed, e.g. at normal temperature, the degrees of desulfurization in a single pass of thiophene and dibenzothiophene in 5 min respectively reach about 40% and 50%. The method has not only high desulphurization efficiency, but also the advantages of easiness in recovering and reusing of the ionic liquid, mild desulphurization conditions, environmentally friendly, simple process, convenient operation and easiness in realizing industrialization.

The invention discloses an oxidation-resistant corrosion-resistant additive for preparing protective paint for an underground metallic pipeline, and relates to the technical field of paint for pipelines. The oxidation-resistant corrosion-resistant additive is prepared from the following raw materials in parts by weight: 15 to 20 parts of polytetrafluoroethylene ultrafine powder, 5 to 10 parts of rosin modified phenolic resin, 3 to 6 parts of polyvinyl chloride paste resin, 3 to 6 parts of polyethylene glycol terephthalate, 2 to 4 parts of ethylene-vinyl acetate copolymer, 2 to 4 parts of rubber powder, 1 to 2 parts of polydimethyldiallyl ammonium chloride, 1 to 2 parts of vulcanized lard, 0.5 to 1 part of sepiolite fiber, 0.5 to 1 part of glass fiber powder, 0.3 to 0.5 part of ferrous sulfate, 0.3 to 0.5 part of nano zinc oxide, 0.1 to 0.3 part of N-methyl pyrrolidone and 0.1 to 0.3 part of 1-butyl-3-methylimidazolium dicyanamide. By using the additive provided by the invention, a coating formed by the paint can be enabled to have excellent oxidation resistance and corrosion resistance; the erosion of soil and air to a metallic pipeline is retarded; the rusting speed of the surface of the metallic pipeline is slowed down.

The invention discloses a carbon nanotube filled copper metal complex nano composite burning rate catalyst, which is prepared by the following steps: performing ultrasonic treatment on multi-walled carbon nanotubes with different tube diameters through a mixed acid solution to obtain oxidized carbon nanotubes with openings at two ends, adding the oxidized carbon nanotubes into a saturated solution of Cu(NO3)2.3H2O, [Cu(TMEDA)2](NO3)2 (TMEDA=tetramethylethylenediamine), [Cu(MIM)4](DCA)2 (MIM=1-methylimidazole, and DCA=dicyandiamide anions), or [Cu(NMIM)4](DCA)2 (NMIM=2-nitro-1-methylimidazole, and DCA=dicyandiamide anions), carrying out ultrasonic treatment to fill the cavities of the oxidized carbon nanotubes with the copper metal complexes, thereby obtaining the nano composite burning rate catalyst with the carbon nanotubes filled with the copper metal complexes. The preparation method is simple, and the obtained nano-composite burning rate catalyst is good in catalytic effect and easy to prepare in an enlarged mode.

The invention relates to a lift-off agent for safe aerial shells and a preparation method thereof, belonging to the field of pyrotechnic compositions. The agent comprises the following components: nitrified bamboo cellulose, potassium nitrate, a component A and a component B, wherein the component A is any one selected from melamine and dicyandiamide; and the component B is any one selected from guanidine salt, aminoguanidine salt, diaminoguanidine salt and triaminoguanidine salt. The preparation method is simple in process and easy to operate, a high-temperature pressurizing and depressurizing device is not used in the preparation process, operation is safe and reliable, and industrial production can be achieved. The yield of the prepared agent is high, and particles of the produced lift-off agent for safe aerial shells are uniform in particle size and good in compression formability.

The invention provides a catalyst for synthesizing methylal by methanol through liquid-phase one-step oxidation as well as a preparation method and an application method of the catalyst and relates to the technical field of chemical synthesis. The catalyst provided by the invention is a copper halide / ionic liquid composition with the mol ratio 1 to (0.5 to 10), wherein a the cation of ionic liquid is selected from one or more of an iminazole type ion, a pyridine type ion and a quaternary ammonium salt ion; an the anion of the ionic liquid is selected from one or more of a halogen ion, a nitrate ion, a bisulfate ion, a dicyanamide ion, a trifluoromethanesulfonate ion, a tetrafluoroborate ion, a hexafluorophosphate ion and a bistrifluoromethanesulfonimide ion. According to the catalyst provided by the invention, a catalysis system is formed by mixing copper halide and the ionic liquid; compared with a copper halide catalyst in the prior art, the selectivity of the methylal is improved to 87 percent or more, even the selectivity of part of reagents even reaches 90 percent or more; compared with a CuCl / oxime compound catalyst, the catalysis system has smaller toxicity, is more environmentally friendly and has better stability; the requirements for green chemical engineering by an existing production trend are met.

The invention relates to the use of dicyanamide-containing ionic liquids which decrease the cure temperature of cyanate esters to form unique thermoset polymers having a triazine network. These thermoset polymers having the triazine network have an ionic character allowing for use in varied applications. The thermoset polymers described herein are useful in high temperature performance composites, and their high Tg makes them useful as a substitute for epoxies in the microelectronics industry. The thermoset polymers have good fracture toughness, excellent substrate adhesion, low shrinkage, and low moisture uptake.

The invention relates to a colored light cold firework powder and a preparation method thereof, and belongs to the technical field of civil entertainment fireworks. The preparation method comprises the following steps: weighing nitrocellulose, dicyandiamide, liquid fluororubber, titanium hydride powder and colored rare earth photoluminescence powder; dividing the liquid fluororubber into two parts, wherein the first part is 0.1-0.5% of the total mass of the titanium hydride powder and the colored rare earth photoluminescence powder, and the rest is the second part; mixing the weighed titaniumhydride powder and colored rare earth photoluminescence powder, dropwise adding the first part of liquid fluororubber, kneading, sieving and drying to obtain luminescent granulated powder; and mixingthe nitrocellulose, dicyandiamide and the luminescent granulated powder, dropwise adding the second part of liquid fluororubber, granulating, and drying to obtain the colored light cold firework powder. The colored light cold firework powder provided by the invention is low in cost of raw materials required for preparation, rich in color during setting off, and green and environment-friendly in setting off process.

The present invention provides Bis-(1(2)H-tetrazol-5-YL)-amine compound, and safe and inexpensive methods for producing high quality Bis-(1(2)H-tetrazol-5-YL)-amine compound. Also provided are Bis-(1(2)H-tetrazol-5-YL)-amine intermediates, and methods for their preparation. The process of preparing Bis-(1(2)H-tetrazol-5-YL)-amine intermediate substantially combines dicyanamide salt, azide salt, solvent and acid at 40-70 C temperature. The process of preparing Bis-(1(2)H-tetrazol-5-YL)-amine anhydride and / or Bis-(1(2)H-tetrazol-5-YL)-amine monohydrate comprises heating the intermediate described above at ≧75 C and adding a second acid.