150 results about "Cyanamide" patented technology

The invention discloses a cyanamide axial coordination cobalt monatomic catalyst for persulfate activation and a preparation method and application thereof, and belongs to the technical field of persulfate advanced oxidation. The catalyst is prepared by the following method: simultaneously adding NH2CN and NaOH into a CoCl2 solution, stirring for reaction, and after the reaction is finished, washing, filtering and drying to obtain the catalyst CoN4 (NCN). The catalyst CoN4 (NCN) with an isolated Co site and cyanamide ([NCN] 2-) coordination structure is synthesized by adopting a one-step precipitation method. The catalyst can be used for an advanced oxidation system based on persulfate activation, and can be used for deeply treating a water body polluted by high-concentration organic matters, so that the biodegradability of the water body is improved. In addition, CoN4 (NCN) also has obvious stability and environmental adaptability, and has important application prospect and value in the field of organic pollutant degradation.

The invention provides a gold leaching agent for treating high-carbon gold-bearing minerals and a gold leaching process, and belongs to the technical field of hydrometallurgy. According to the gold leaching agent, guanidinium thiocyanate is used as an agent main body, a hydroximic acid compound is used as a complexing synergist, and soluble inorganic salt of ferric iron is used as a competitive adsorbent. In a leaching system, guanidine thiocyanate can be decomposed to generate guanidine, sodium sulfide, sodium thiocyanate and water. Thiourea anions are converted into cyanamide under the alkaline condition, then cyanamide is slowly released and decomposed into cyanide ions, the cyanide ions are complexed with gold ions, and gold leaching is achieved. Namely, guanidinium thiocyanate has the effect of releasing the cyanide ions step by step, and slow release of the cyanide ions is realized. The gold leaching agent system does not contain cyanide (sodium cyanide, potassium cyanide and the like) and is a clean and environment-friendly agent system, and efficient leaching of gold in high-carbon gold-bearing minerals can be achieved through the synergistic effect of all functional agent components.

The invention discloses a preparation method of a polymeric cyanamide low-toxicity gold leaching agent, and belongs to the field of hydrometallurgy. The preparation method comprises the following steps: uniformly mixing urea, sodium carbonate and ferrous chloride and finely grinding; then putting the fine grinding material into a high-temperature heating container, gradually raising the temperature, and preserving the heat; gradually cooling the reaction product to room temperature along with the furnace; and finally, a reaction product is crushed and ground into powder, and the polymeric cyanamide low-toxicity gold leaching agent is obtained. The synthetic raw materials of the gold leaching agent are simple, cheap and easy to obtain, the synthetic process is simple and easy to regulate and control, and the synthetic cost is low. The gold leaching agent obtained through the method is low in toxicity, the gold leaching speed is high, the gold leaching rate is high, and leaching tailings are common solid waste and are easier to treat.

A method for preparing a positive electrode material and an energy storage battery are provided. The method includes: preparing an Fe-MOF, including: dispersing a first iron source in a solvent, adding the cyanamide organic ligands into the solvent to perform reflux reaction to obtain a reaction solution, and performing cooling, filtering, and cleaning on the reaction solution to obtain the Fe-MOF; grinding and blending the Fe-MOF with a second iron source, a lithium source, and a phosphorus source to obtain a premix; and performing a sintering treatment on the premix under an atmosphere of an inert gas to obtain a composite lithium iron phosphate positive electrode material. The composite lithium iron phosphate positive electrode material includes lithium iron phosphate particles and carbon nanotubes, the lithium iron phosphate particles are attached to a surface of the carbon nanotubes, and there is iron wrapped by each of the carbon nanotubes.

The invention relates to a flame-retardant composition, a flame-retardant layer and a new energy automobile power battery comprising the flame-retardant layer. The flame-retardant composition comprises the following components in percentage by weight: 50-68% of matrix resin which is a mixture of polycarbonate and polyphenyl ether in a weight ratio of (1: 1)-(3: 1); the composite flame retardant comprises a phosphate flame retardant, a cyanamide flame retardant and an inorganic flame retardant according to the weight ratio of 1: (0.5-0.8): (2-2.5), and the inorganic flame retardant is selected from one or more of aluminum hydroxide, antimony trioxide, magnesium hydroxide and zinc borate; 10-20% by weight of a thermally conductive agent; 5 to 10 wt% of a silane coupling agent; and 1-3 wt% of a lubricant. A flame-retardant layer formed by the flame-retardant composition is arranged between a power battery module and an aluminum shell of the new energy automobile power battery, has good flame retardance, heat conduction and mechanical properties, and can meet the use requirements of the new energy automobile power battery.

The invention provides a preparation method of a cyanamide product, which comprises the following steps: S1, mixing a raw material and a preheated solid catalyst, recording the contact time of the raw material and the preheated solid catalyst as T0, recording the uniform temperature reaching time after mixing as T1, and T1-T0 < = 3s; the raw materials comprise urea or mixed gas of ammonia gas and carbon dioxide, the temperature of the urea is less than or equal to 150 DEG C, and the temperature of the mixed gas is 150-450 DEG C; s2, carrying out gas-solid separation on the obtained reaction mixture, recording the time for completing the gas-solid separation as T2, and enabling T2-T1 to be smaller than or equal to 10s; s3, cooling the obtained gas-phase product to below 110 DEG C within F seconds, wherein the temperature is Flt; the method comprises the following steps: 1, obtaining cyanamide products; by adopting the technical scheme provided by the invention, cyanamide and / or dicyandiamide can have relatively high selectivity, so that the content of cyanamide and / or dicyandiamide in the finally obtained cyanamide product is greater than 96%.

The instant invention relates to a method for preparing N-cyano sulfilimine compounds and derivatives thereof, such as N-cyano sulfoximines. In particular, it has been found that a N-cyano sulfilimine compound may be prepared by mixing in a solvent a sulfide compound (i), cyanamide (ii), and an oxidizing agent (iii) in the presence of compound (iv) comprising an alkali metal hydroxide, a hydrogen carbonate salt, a mixture of hydrogen carbonate salt and a carbonate salt, and / or a mixture of phosphate salts, whereby the yields of N-cyano sulfilimine compound production are increased.

The invention belongs to the technical field of synthesis, and particularly relates to a synthesis method of urea [14C]. The synthesis method of the urea [14C] comprises the following steps: (1) reacting carbonate [14C] with ammonia gas to obtain cyanamide salt [14C]; (2) hydrolyzing the cyanamide salt [14C] obtained in the step (1) with concentrated sulfuric acid at the hydrolysis temperature of 35-45 DEG C; and (3) adjusting the pH value of the hydrolysate obtained in the step (2) with ammonia water, concentrating and purifying to obtain urea [14C]. The synthesis method provided by the invention has the advantages of mild conditions, efficient reaction, high product yield (up to 95% or above), high purity (the chemical purity is greater than or equal to 99%) and the like, and is suitable for large-scale preparation of key raw materials of helicobacter pylori diagnostic reagents.

The utility model discloses a cyanamide desolventizing device which comprises a reaction kettle, a rotating pipeline is rotatably connected in the reaction kettle, connecting rods are symmetrically and fixedly connected to the outer side of the rotating pipeline, a scraper blade is fixedly connected to one end of each connecting rod, and a square groove is formed in the reaction kettle and located on one side of the rotating pipeline. A square groove is formed in the reaction kettle, a mounting plate is slidably connected into the square groove, a push block is slidably connected into the mounting plate, a clamping block is fixedly connected to the outer side of the reaction kettle, and a clamping groove matched with the clamping block for use is formed in the push block. According to the cyanamide desolventizing device, the rotating pipeline can be rotated to drive the scraping plate to rotate through the connecting rod, purified water can be sprayed through the through holes in the rotating pipeline, and the inner side wall of the reaction kettle is comprehensively flushed and cleaned.

The invention discloses a nitrilase mutant and an application of the nitrilase mutant in synthesis of chiral cyanamide. Compared with an amino acid sequence of wild nitrilase amine, the nitrilase mutant protein has the advantages that the nitrilase mutant protein has a higher amino acid sequence; mutation exists at any one or more of the following amino acid sites corresponding to the amino acid sequence as shown in SEQ ID NO.1: the 54th site, the 118th site, the 120th site, the 139th site, the 148th site, the 168th site, the 170th site, the 194th site, the 197th site, the 198th site, the 202 site and / or the 225th site. The mutant constructed by the method disclosed by the invention can be used for efficiently catalyzing a 3-substituted-glutaronitrile compound to generate an (S)-3-substituted-4-cyanobutyramide compound. According to the invention, the problem of insufficient catalytic activity of the existing enzyme is solved, and an efficient scheme is provided for green synthesis of chiral cyanamide.

A method for directionally constructing a non-precious metal catalyst with a high proportion of alloyed diatomic pairs, which relates to a method for preparing a non-precious metal catalyst, is intended to solve the technical problems of low proportion of diatomic pairs and poor catalytic effect in existing diatomic catalysts. This method uses small cyanamide molecules and two transition metal ions to prepare a salt solution pre-anchored with dimetallic ions, then adsorbs the ZIF‑8 powder onto the salt solution, anneals it at high temperature under a protective atmosphere after drying, and obtains a non-precious metal catalyst loaded with a high proportion of alloyed diatomic pairs. The maximum power density of the hydrogen-oxygen proton exchange membrane fuel cell prepared using the catalyst is 1070mW cm in a H2 / O2 environment. ‑2 , the maximum power density in Air / H2 environment reaches 624mW cm ‑2 , which can be used in the field of hydrogen proton exchange membrane fuel cells.

The invention discloses a method for directionally constructing a non-noble metal catalyst with high-proportion alloyed diatom pairs, relates to a preparation method of a non-noble metal catalyst, and aims to solve the technical problems of low proportion of diatom pairs and poor catalytic effect in the conventional diatom catalyst. The method comprises the following steps: preparing a bimetal ion pre-anchored salt solution from cyanamide micromolecules and two transition metal ions, adsorbing ZIF-8 powder to the salt solution, drying, and carrying out high-temperature annealing treatment in a protective atmosphere to obtain the non-noble metal catalyst loaded with high-proportion alloyed diatom pairs. The hydrogen-oxygen proton exchange membrane fuel cell prepared by using the catalyst has the maximum power density of 1070 mW cm <-2 > in an H2 / O2 environment and the maximum power density of 624 mW cm <-2 > in an Air / H2 environment, and can be used in the field of hydrogen proton exchange membrane fuel cells.

The invention discloses a nitrogen / sulfur co-doped porous carbon iron-based composite sodium ion battery negative electrode material and a preparation method thereof. According to the material, chitosan is taken as a carbon source, and the honeycomb-shaped composite carbon material with a hierarchical mesoporous structure is prepared by combining a sodium chloride template method and a two-step calcination process through a double-doping synergistic effect of cyanamine and ferric sulfate. FeS and Fe4 (Fe (CN) 6) 3 active phases are uniformly distributed in the material, FeS and Fe4 (Fe (CN) 6) 3 exist in a heterojunction form, nitrogen is doped in forms of pyridine nitrogen (more than or equal to 50%) and pyrrole nitrogen, and sulfur exists in forms of C-S-C bonds and sulfur oxides. The first efficiency of the material is greater than 90%, the reversible capacity under the current density of 1A / g reaches more than 450mAh / g, the capacity retention ratio after 1000 cycles is greater than or equal to 90%, and the reversible specific capacity under the high rate of 20A / g is still kept more than 150mAh / g. The preparation method comprises the steps of spray drying, two-step calcination and pickling pore-forming. The invention solves the problems of low capacity and poor cycling stability of the existing sodium-ion battery negative electrode material, and is suitable for high-power energy storage equipment.

The invention belongs to the technical field of pharmaceutical chemicals, and particularly relates to a method for preparing guanidinoacetic acid from glycine mother liquor. Based on a glycine-cyanamide method, a glycine solution containing iminodiacetic acid is used as one of reaction raw materials. When the method is used for preparing the guanidinoacetic acid, the glycine mother liquor can be directly used for preparing the guanidinoacetic acid, so that the mother liquor is directly treated, the separation step of the glycine mother liquor is omitted, and the process is simplified. Moreover, the method has an unexpected technical effect on the improvement of the yield of the guanidinoacetic acid, and the yield of the guanidinoacetic acid is improved by 6.2-6.4% compared with the prior art.

The invention relates to a creatine monohydrate preparation method, which comprises: S1, carrying out a first reaction on a methylaminoacetonitrile aqueous solution and a first sodium hydroxide aqueous solution to obtain a sodium sarcosinate-containing aqueous solution; s2, carrying out separation treatment on the aqueous solution containing sodium sarcosine in the step S1 by adopting a bipolar membrane electrodialysis device to obtain an aqueous solution containing sarcosine and a second sodium hydroxide solution; and S3, carrying out a second reaction on the aqueous solution containing sarcosine in the step S2 and cyanamide to obtain a crude product containing sarcosine monohydrate. The creatine monohydrate prepared by the preparation method provided by the invention is high in purity and does not contain dicyandiamide and creatinine impurities, and the total yield of the creatine monohydrate is 90% or above.

The invention discloses a kiwi fruit container seedling raising early-maturing-promoting cultivation method, and relates to the technical field of kiwi fruit cultivation, and the technical scheme is characterized in that Jiangxi red soil, an organic fertilizer, peat, chaff, perlite and vermiculite are mixed according to a specific proportion to form a substrate suitable for kiwi fruit growth; the scions of the grafted kiwi fruit seedlings are soaked in a 1.2% cyanamide solution, and the scions are taken out after being treated for a certain time; putting the treated grafted seedlings into a nutrition bowl, placing the nutrition bowl in a heat preservation shed, controlling the temperature in the shed, and promoting the scions to germinate in advance; after the scions germinate, conventional seedling culture management is carried out until the kiwi fruit seedlings reach the standard of high-quality seedlings. According to the method, the formula matrix based on specific red soil in Jiangxi is used, greenhouse covering heat preservation and 1.2% cyanamide agent treatment are combined, early germination of kiwi fruit scions can be effectively promoted, and the high-quality seedling rate of half-year seedlings and one-year seedlings of kiwi fruits is remarkably increased.

According to the preparation method, a nitrogen source and an ammonia source are taken as reaction substrates, a metal organic compound is taken as an auxiliary agent, and guanidine carbonate is obtained through reaction. The preparation method comprises the following steps: by taking a metal organic compound MFM-303 (Al) as an auxiliary agent, under the induction of carboxyl and hydroxyl in a pore channel of the MFM-303 (Al), adsorbing and storing ammonia gas released by heating and decomposing an ammonia source or ammonia gas of the ammonia source in the pore channel, and then reacting with a nitrogen source cyanamide, urea or dicyandiamide to obtain guanidine carbonate; high-temperature and high-pressure reaction conditions are not needed, and meanwhile, the use of a large amount of ammonia water in the traditional process is abandoned, so that the industrial production safety is high; the method has the advantages of mild reaction conditions, few side reactions and high product yield, and is beneficial to industrial large-scale production.

The invention relates to the technical field of medicines, in particular to application of enboviramide in preparation of a medicine for resisting chikungunya virus infection. The enbopividone belongs to a cyanamide dye compound, is a very effective medicine for treating enterobiasis at present, and is low in side effect and good in safety.

The application discloses a calculation method of a reaction mechanism of cyanamide prepared in an alkaline environment and application thereof in byproduct control, and the calculation method comprises the following steps: step 1, constructing a molecular initial model of a reaction system containing a hydroxyl water molecular cluster, performing structural optimization and vibration analysis tasks on the model by using a density functional theory method, and calculating the molecular configuration to obtain a reasonable configuration without virtual frequency; step 2, searching for a reaction transition state based on the reasonable configuration of step 1, and verifying the reasonableness of the transition state; step 3, calculating the free energy in an alkaline aqueous solution environment, and drawing a potential energy surface diagram to determine the reaction rate control step; and step 4, selecting the reaction calculation hydrogen dissociation energy and hydrogen combination energy values of the reaction rate control step containing an intramolecular hydrogen migration process. The calculation method can simulate and calculate phenomena that are difficult to observe by experimental means, obtain reaction information of each elementary reaction process in an actual reaction, obtain the essential law of the reaction mechanism in the alkaline environment, and provide a theoretical reference for process improvement to reduce byproduct generation and promote the selectivity of the main reaction.

This application belongs to the field of drug detection. This application provides a method for detecting cyanamide impurities in drugs, including: successively adding a cyanamide reference substance or a test sample to an alkaline buffer solution and a dansyl chloride solution for derivatization reaction, and then using liquid chromatography tandem chromatography for detection, and calculating the content of cyanamide in the test sample by the standard curve method. The detection method of this application adjusts the derivatization reaction conditions by adding an alkaline buffer solution with a certain pH, making the derivatization product more stable; optimizing the liquid chromatography and mass spectrometry conditions, the resolution and peak shape of the derivatization product are good. The detection method of this application has excellent accuracy, sensitivity and stability, meets the various evaluation indexes of drug impurity detection, and can accurately determine the content of cyanamide impurities in drugs.

The invention belongs to the technical field of analytical chemistry, and particularly relates to application of cyanamide waste residue carbon in lotus alkaloid extraction, a solid-phase extraction adsorbent and application of the solid-phase extraction adsorbent. The cyanamide waste residue carbon solid-phase extraction method can realize separation and purification of 32 alkaloids in the lotus, and test results show that the extraction recovery rate of the 32 alkaloids in the lotus mixed extraction diluent reaches 83.09%-98.54%, so that an excellent balanced extraction effect is reflected, and the method is suitable for industrial production. The problems that the separation and purification types of alkaloid are few, the extraction method is complex and the extraction recovery rates of all components are uneven due to the influence of pigments in the plant lotus at present are effectively solved. Meanwhile, a new thought is provided for high value-added utilization of the cyanamide waste residue carbon.

To provide a method for producing a pultruded molding, capable of reducing the pultrusion force both before and after curing in a mold, and yielding a pultruded molding with excellent appearance and dimensional precision.SOLUTION: A method of producing a pultruded molding, the method including curing a material that contains components (A)-(D) and meets conditions (I) and (II). [Components] (A) carbon fiber; (B) an epoxy base agent selected from bisphenol A type and bisphenol F type; (C) an epoxy base agent selected from aminophenol type, novolac type, and aliphatic ether type; (D) at least one epoxy curing agent selected from cyanamide type and alicyclic amine type. [Conditions] (I) the volumetric expansion ratio V80 / V25, when the mixture of (B) and (C) is heated from 25°C to 80°C, satisfies a predetermined relational expression; (II) the viscosity increase ratio of the mixture of (B), (C), and (D) after 90 minutes at 25°C is 1.80 times or less.SELECTED DRAWING: None

The present application relates to a flame-retardant composition, a flame-retardant layer and a new energy automobile power battery comprising the flame-retardant layer. The flame-retardant composition comprises: 50-68 wt% of a base resin which is a mixture of polycarbonate and polyphenyl ether in a weight ratio of 1:1-3:1; 15-28 wt% of a composite flame retardant comprising a phosphoric acid ester flame retardant, a cyanamide flame retardant and an inorganic flame retardant in a weight ratio of 1:0.5-0.8:2-2.5, wherein the inorganic flame retardant is selected from one or more of the group consisting of aluminum hydroxide, diantimony trioxide, magnesium hydroxide and zinc borate; 10-20 wt% of a heat-conducting agent; 5-10 wt% of a silane coupling agent; and 1-3 wt% of a lubricant. The flame-retardant layer formed by the flame-retardant composition is arranged between the power battery module and the aluminum shell of the new energy automobile power battery, has good flame-retardant, heat-conducting and mechanical properties, and can meet the use requirements of the new energy automobile power battery.

The utility model relates to the technical field of nano calcium carbonate preparation, in particular to a nano calcium carbonate preparation system which comprises a hydrolysis tank, a first conveying pipe is communicated with the side lower part of the hydrolysis tank, a first surface filter is communicated with the first conveying pipe, and an upper outlet of the first surface filter is communicated with a buffer tank through a pipeline; the buffer tank is communicated with a second conveying pipe, the second conveying pipe is communicated with an inlet of a Jinyu reactor, an outlet in the bottom surface of the Jinyu reactor is communicated with a second surface filter through a pipeline, and an outlet in the upper part of the second surface filter is communicated with a buffer tank through a pipeline. According to the nano calcium carbonate preparation system, after lime nitrogen is hydrolyzed, water-insoluble impurities are filtered out firstly, the whiteness of a nano calcium carbonate product is guaranteed, meanwhile, only substances such as graphite are intercepted during filtering, Ca < 2 + > reacts with a cyanamide product and remains in the system in the form of basic salt, and loss is avoided. And the filtered graphite waste residue can be recycled.

The present application relates to the technical field of tail gas treatment of pesticide compound production, and particularly relates to a tail gas absorption system in cyanamide methyl formate production process, comprising: a tail gas collecting pipeline, a pretreatment unit, a deep purification unit and a detection device; wherein the pretreatment unit comprises a dust removal tower for cooling and dedusting the tail gas; the deep purification unit comprises an absorption tower made of stainless steel, PPH or glass steel, which is used for purifying the tail gas and treating toxic and harmful substances in the waste gas; the detection device is used for real-time monitoring of tail gas emission indexes to ensure standard emission. The technical scheme can quickly and effectively adsorb and purify the tail gas generated in the cyanamide methyl formate production process, has high adsorption performance, and also has large adsorption capacity and excellent selectivity.

The invention belongs to the technical field of environmental protection, and particularly relates to a green production process of aminoguanidine carbonate. The method comprises the following steps: inputting hydrazine hydrate and softened water into a premixer, pumping CO2 into the premixer, controlling the pumping pressure of the CO2 at 0.03-0.05 MPa, stabilizing the pH value of a mixed solution at 5.0-5.5, premixing, respectively pumping the premixed solution and a cyanamide aqueous solution into a Taylor-type tubular reactor, arranging CO2 injection ports on the Taylor-type tubular reactor in sections, respectively injecting CO2 through the CO2 injection ports, and respectively injecting the hydrogen cyanamide aqueous solution through the CO2 injection ports. The pH value of the reaction system is kept at 5.0-5.5 for reaction, and reaction liquid is rapidly cooled to 0-5 DEG C through a tubular heat exchanger and then enters a reaction kettle for crystallization; and after the crystallization is finished, filtering, washing and drying the feed liquid to obtain the product aminoguanidine carbonate. According to the method, efficient, safe and controllable industrial production is realized, the yield is high, the CO2 utilization rate is high, the cost is low, the product purity is high, and the crystal particle size distribution is uniform.

This invention discloses a treatment device for wastewater from the production of cyanamide plant growth regulators, including an oxidation tank and a flocculation tank. A detection box is installed on one side of the bottom of the oxidation tank. This invention targets the oxidation and precipitation treatment process of cyanamide wastewater, dividing the wastewater into oxidation and flocculation tanks. The main oxidation and precipitation treatment is carried out in the oxidation tank. A rotary jet agitator is installed at the upper end of the oxidation tank, using the wastewater flowing into the oxidation tank as a circulation carrier to uniformly spray the synchronously supplied oxidant into the oxidation tank through the jet agitator. This is beneficial to improve the reaction effect between the oxidant and the wastewater. By combining wastewater information with a preset dosage ratio model, the theoretical dosage of the agent is obtained. The oxidant is added in a "precise", "dynamic", and "intelligent" manner by combining addition and ORP monitoring feedback, avoiding the problems of excessive oxidant or incomplete treatment that may occur with traditional fixed addition methods.

The invention belongs to the technical field of organic synthesis, and relates to a preparation method of cimetidine, in particular to a process for synthesizing cimetidine through continuous flow reaction. According to the process, cyanamide and methyl isocyanate are taken as initial raw materials and are accurately pumped into a microchannel continuous flow reactor according to a certain molar ratio, and the N-cyano-N '-methylurea intermediate is efficiently and controllably synthesized at a specific temperature. And then, synchronously pumping a 2-(((5-methyl-1H-imidazole-4-yl) methyl) sulfo) ethyl-1-amine hydrochloride solution and the N-cyano-N '-methylurea intermediate into a subsequent continuous flow reaction module, introducing the reaction liquid into an online drying device with a molecular sieve in real time, and promoting efficient nucleophilic addition reaction through continuous water removal, thereby obtaining the N-cyano-N'-methylurea intermediate. Finally, the cimetidine is obtained at a high yield. The method has the outstanding advantages of mild conditions, high yield, stable product quality, easiness in large-scale amplification and the like, and is a new generation of cimetidine preparation technology which is green, safe and efficient and has important industrial application value.

The invention relates to application of a polycyclic quinazolinone compound in resisting plant pathogenic fungi in the technical field of organic synthetic chemistry and agricultural pharmacology, the structural formula of the derivative is shown as I or II, in the structural formula, R is H, 4-OMe, 4-Me, 4-CO2Me, 4-F, 4-CF3, 4-Cl, 4-Br, 2-Br or 2-F, and R is H, 4-OMe, 4-Me, 4-CO2Me, 4-F, 4-CF3, 4-Cl, 4-Br, 2-Br or 2-F; the series of compounds have a certain inhibition effect on plant pathogenic fungi including strawberry botrytis cinerea, fusarium graminearum, rhizoctonia solani and magnaporthe oryzae, and can be applied to plant protection as a bactericide. The preparation method comprises the following steps: by taking N-cyanamide olefin as a raw material and lauroyl peroxide as an oxidizing agent, reacting in a dichloromethane or trichloromethane solvent at 80-120 DEG C to obtain the polycyclic quinazolinone compound with antibacterial activity. The preparation method is simple to operate, green and efficient.

The invention relates to a novel dicyandiamide solution filtering device and the technical field of dicyandiamide solution filtering, comprising a polymerization kettle for polymerizing cyanamide liquid, wherein the upper end outer side of the polymerization kettle is fixedly connected with a suction filter cylinder; a material storage component is provided on one side of the suction filter cylinder, and the material storage component is connected with the suction filter cylinder through a liquid extraction pipe; a filtering component is provided below the material storage component, and the filtering component is fitted and connected with a drainage component; a heater generates high temperature to heat the cyanamide liquid in a polymerization bin to 72 DEG C, and in the process of the cyanamide liquid being heated, a proper amount of quicklime is added into the polymerization bin through a feed inlet, and under the stirring of a connecting plate and bristles, the cyanamide liquid and the quicklime are fully fused and the pH value of the cyanamide liquid is adjusted to about 10-11, and then the polymerization reaction is completed and the cyanamide liquid is converted into a dicyandiamide liquid; at this time, a large amount of insoluble calcium salt impurities are doped in the dicyandiamide liquid, and the bristles continuously scratch the inner wall of the polymerization bin, so that the insoluble calcium salt impurities can be prevented from adhering to the inner wall of the polymerization bin.