Liquefied dicyandiamide and its preparing process

A technology of dicyandiamide and chemical formula, applied in the field of liquefied dicyandiamide and its preparation, can solve the problems of poor miscibility of epoxy resins and complicated processes, and achieve long-term storage stability and good compatibility.

Inactive Publication Date: 2005-03-23
北京科化新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Soluble in water and ethanol, but poor miscibility with epoxy resin, so dicyandiamide, as an effective curing agent for epoxy resin, must be crushed into very fine powder and suspended in epoxy resin, and because it is very easy to Absorb moisture in the air, so the process is more complicated in the preparation process

Method used

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  • Liquefied dicyandiamide and its preparing process
  • Liquefied dicyandiamide and its preparing process
  • Liquefied dicyandiamide and its preparing process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] In a 250ml there-necked flask equipped with an electric stirrer, a spherical condenser and a thermometer, add 34 grams of dicyandiamide, 0.34 grams of 2-ethyl-4-methylimidazole, 60 grams of ethylene glycol monomethyl ether and 91 gram of glycidyl neodecanoate, start the stirrer, start to heat up, keep the temperature at 140°C to 150°C, react for 12 hours, vacuumize and remove the solvent for about 10 minutes. A milky white viscous liquid was obtained. See Tables 1 and 2 for properties.

Embodiment 2

[0034] In a 50ml there-necked flask equipped with an electric stirrer, a spherical condenser and a thermometer, add 34 grams of dicyandiamide, 0.34 grams of 2-ethyl-4-methylimidazole, 80 grams of ethylene glycol monomethyl ether and 137 gram of glycidyl neodecanoate, start the stirrer, start to heat up, keep the temperature at 140°C to 150°C, react for 12 hours, vacuumize and remove the solvent for about 10 minutes. A viscous, pale milky white product was obtained. See Tables 1 and 2 for properties.

Embodiment 3

[0036] In a 250ml there-necked flask equipped with an electric stirrer, a spherical condenser and a thermometer, add 34 grams of dicyandiamide, 0.34 grams of 2-ethyl-4-methylimidazole, 100 grams of ethylene glycol monomethyl ether and 182 grams of glycidyl neodecanoate, start the stirrer, start to heat up, keep the temperature at 140 ℃ ~ 150 ℃, react for 14 hours, vacuumize and remove the solvent, the time is about 10 minutes. A viscous, light orange-red product was obtained. See Tables 1 and 2 for properties.

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Abstract

Liquefacient dicyandiamide and its preparation method. The method comprises: adding 100 parts of dicyandiamide, 300-600 parts of dehydrated neodecanoic acid glyceride, 50-200 parts of solvent, 0.5-1 par of 2-ethyl-4-methylimidazol or 2-methylimidazol into a reactor; mixing and heating, reacting for 12-14hours at 140degree C-150degree C ; vacuumizing and removing the solvent, obtaining viscous liquid. When the liquefacient dicyandiamide is used with ethoxyline resin, the weight ratio of liquefacient dicyandiamide to ethoxyline resin is 30-50:100. Liquefacient dicyandiamide of the invention could be dissolved in ethoxyline resin, has an ability of solidifying ethoxyline resin with high mechanical strength.

Description

technical field [0001] The invention belongs to the field of coatings, composite materials or adhesives, and in particular relates to liquefied dicyandiamide and a preparation method thereof. Background technique [0002] Dicyandiamide is also known as cyanoguanidine. First, due to the effect of conjugated double bonds and cyano groups in the molecule, the alkalinity is greatly reduced, so its mixture with epoxy resin is very stable at room temperature and can be used as a latent curing agent; second, it is compatible with epoxy resin The cured product has excellent mechanical properties; third, it is non-toxic and non-irritating. Therefore, as a curing agent for epoxy resins, dicyandiamide is widely used in the fields of coatings, composite materials, and adhesives. [0003] Dicyandiamide is a white crystalline powder with a melting point of 207-209°C. Soluble in water and ethanol, but poor miscibility with epoxy resin, so dicyandiamide, as an effec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G59/50
Inventor 聂绪宗杨川王丽娟李世媛
Owner 北京科化新材料科技有限公司
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