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Chinese name: cyanoguanidine, dicyandiamide

Dicyandiamide, Cyanoguanidine

Hereinafter referred to as: DICY

Description: White crystalline powder. The solubility of water is 2.26% at 13ºC, which is larger in hot water. When water solution is decomposed at 80ºC, ammonia gas is produced. The solubility of anhydrous ethanol (C2H5OH) and ethyl ether were 1.26% and 0.01% respectively at 13ºC. Soluble in liquid ammonia, hot water, ethanol, acetone hydrate, dimethylformamide, insoluble in ether, insoluble in benzene and chloroform. Relative density (D254)1.40. The melting temperature of 209.5 ºC. It is stable when dry. Don't burn. Low toxicity, half lethal dose (mice, oral)>4000mg/kg. The maximum allowable concentration in the air is 5mg/ M&SUp 3; .

Storage: Sealed and dry.

structured

Fold edit the chemical properties of this section

Two melamine
Two melamine
Use and store according to specifications, no decomposition, avoid contact with oxide. The solubility in 13ºC anhydrous ethanol was 1.26% and 2.26% respectively. It is easy to dissolve in hot water, and ammonia will be produced when the water solution is above 80ºC. The crystallization of dicyandiamide heating to the melting point, melting immediately after the intense heat, the formation of melamine, melamine, etc.

Fold edit this section for preparation

The cyanohydrin suspension obtained from the hydrolysis of calcium cyanamide was removed by decompressed filtration, and then carbon dioxide was added to the filtrate to precipitate calcium carbonate, and the cyanohydrin was obtained. It was polymerized under alkaline conditions and then filtered, cooled, crystallized, separated and dried to obtain dicyandiamide.

Cacn2 2 + 2 h2o - Ca (engineered) 2 + Ca (OH) 2

Ca (engineered) 2 + CO2 + H2O - 2 nh2cn + CaCO3

2 NH2CN - (NH2CN) 2

The temperature at the maximum speed of dicyandiamide formation is related to pH: pH is 9.7 at 50ºC. At 80ºC, pH was 9.1. The pH value is 8.8 at 100ºC. Controlled under these conditions, after cooling crystallization, separation, drying, the finished product dicyandiamide. Industrial product dicyandiamide content of 99%, per ton of product consumption of lime nitrogen (nitrogen containing more than 21%)4239kg.

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Test cobalt, nickel, copper and palladium. Organic synthesis. Nitrifying fiber stabilizer. Curing agent. Detergent. Vulcanization accelerator. Resin synthesis.

Used as latent curing agent of epoxy resin adhesives, preparation of single-component epoxy adhesives, only when the size of dicydiamine ≤5 m(2500 mesh), can form suspension in epoxy resin, no precipitation. Reference dosage is 4~12 parts, 100g epoxy resin composition is suitable for 6~12 months. The storage period of dicyandiamide is less than 2 months in the dosage of 17 parts and up to 6 months in the dosage of 8 parts. Curing conditions 170ºC/ LH or 180ºC/20min, thermal deformation temperature 125ºC. It is also used as curing agent for one component waterborne epoxy adhesives. Reference dosage: 7 servings. Dicyandiamide (5~6 parts) and hydrazine (3~4 parts) compound system, 120ºC/45min curing epoxy resin


Folding as guanidine, melamine raw materials

All kinds of guanidine salts can be made by reacting dicyandiamide with acid. Dicyandiamide and phenylnitrile reaction to obtain the benzene melamine is coating, laminate, forming powder intermediate.

Fold as a dye fixative

Dicyandiamide resin prepared by the reaction of dicyandiamide and formaldehyde can be used as dye fixing agent.

Fold dicyandiamide fertilizer
Dicyandiamide compound fertilizer can control the activities of nitrifying bacteria, adjust the conversion rate of nitrogen fertilizer in soil, reduce the loss of nitrogen, and improve the efficiency of fertilizer use.

Folding as a fine chemical intermediate

It is used to make guanidine nitrate and sulfonamides in medicine. It is also used to make thiourea, nitrocellulose stabilizer, rubber vulcanization accelerator, iron and steel surface hardening agent, artificial leather packing, adhesive, etc. The pharmaceutical intermediate 5-azacytosine was obtained by the reaction of dicyandiamide and formic acid. As a nitrogen source, carbon materials are doped with nitrogen




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