News Details
Dicyanodiamine Coating Crosslinking Agent
2017-7-10 16:30:59
Dicyandiamide coating crosslinking agent commonly known as dicyandiamide, the English abbreviation DICY, is very early application of latent cross-linking agent, widely used in powder coatings, single packaging adhesive, film glue.
Dicyandiamide as white crystals, the melting point of 207 ~ 209 ℃, less toxic, but difficult to dissolve in epoxy resin, there are reports of solvent can be used to dissolve dicyandiamide in epoxy resin, but most of the current dicyandiamide The crosslinking agent is crushed and mixed with the epoxy resin, and the mixture is heated and kneaded on the triple roll or processed by an extruder. Usually without adding a mixture of additives, the use of the period of more than six months.
Dipyridine diamine cross-linking agent cross-linking mechanism is more complex, in addition to four active hydrogen can participate in the reaction, the cyano group is also reactive. In addition dicyandiamide also has the role of catalytic crosslinking agent. For E-51 epoxy is the resin, the theoretical amount of dicyandiamide for every 100g resin 11g, and the actual amount of 4 ~ 10g, especially for the general use of solid epoxy resin are relatively small.
The four active hydrogens on the dicyandiamide are first reacted with the epoxy group, and then the hydroxyl group of the product is reacted with the original CN of dicyandiamide to form a crosslinked structure of N-alkyl substituted guanidine. Through the differential scanning calorimetry and infrared spectroscopy, the reaction process was investigated. It was found that dicyandiamide was involved in the cross-linking reaction, except that it was decomposed by the above mechanism.
Dicyandiamide and modified dicyandiamide, has been widely used as a powder coating crosslinking agent. In addition, the use of its long life advantage, can be used for a liquid type adhesive, especially for nylon-epoxy adhesive, has a very high shear strength (about 40 MPa), and very high peel strength, In the aircraft manufacturing industry has been applied.
Dicyandiamide for the shortcomings of the cross-linking dose that is too high cross-linking temperature, generally 150 ~ 170 ℃, so abroad has been focused on the preparation of dicyandiamide dicyandiamide derivatives, powder coating special cross-linking agent AEHD-610, AEHD-210, belong to this type of product.
Chinese name: Diethyl toluene diamine(DETDA)
Dicyandiamide as white crystals, the melting point of 207 ~ 209 ℃, less toxic, but difficult to dissolve in epoxy resin, there are reports of solvent can be used to dissolve dicyandiamide in epoxy resin, but most of the current dicyandiamide The crosslinking agent is crushed and mixed with the epoxy resin, and the mixture is heated and kneaded on the triple roll or processed by an extruder. Usually without adding a mixture of additives, the use of the period of more than six months.
Dipyridine diamine cross-linking agent cross-linking mechanism is more complex, in addition to four active hydrogen can participate in the reaction, the cyano group is also reactive. In addition dicyandiamide also has the role of catalytic crosslinking agent. For E-51 epoxy is the resin, the theoretical amount of dicyandiamide for every 100g resin 11g, and the actual amount of 4 ~ 10g, especially for the general use of solid epoxy resin are relatively small.
The four active hydrogens on the dicyandiamide are first reacted with the epoxy group, and then the hydroxyl group of the product is reacted with the original CN of dicyandiamide to form a crosslinked structure of N-alkyl substituted guanidine. Through the differential scanning calorimetry and infrared spectroscopy, the reaction process was investigated. It was found that dicyandiamide was involved in the cross-linking reaction, except that it was decomposed by the above mechanism.
Dicyandiamide and modified dicyandiamide, has been widely used as a powder coating crosslinking agent. In addition, the use of its long life advantage, can be used for a liquid type adhesive, especially for nylon-epoxy adhesive, has a very high shear strength (about 40 MPa), and very high peel strength, In the aircraft manufacturing industry has been applied.
Dicyandiamide for the shortcomings of the cross-linking dose that is too high cross-linking temperature, generally 150 ~ 170 ℃, so abroad has been focused on the preparation of dicyandiamide dicyandiamide derivatives, powder coating special cross-linking agent AEHD-610, AEHD-210, belong to this type of product.
Chinese name: Diethyl toluene diamine(DETDA)
Diethyltoluenediamine packing： net weight 200KG/ galvanized iron drum (a small cabinet pallet loaded 16 tons), 1000KG/IB barrels (a small cabinet loaded 18 tons or 23 tons of ISOTANK).
In addition, more research focus is to find an effective accelerator, without compromising the use of life and performance under the premise of trying to reduce the cross-linking temperature, the ideal situation is reduced to about 120 ℃. There are many varieties of accelerators, mainly urea derivatives, imidazole derivatives, organic guanidine derivatives, etc., are not enumerated.
Dicyandiamide derivatives are HT-2833, HT-2844, such cross-linking agent and epoxy resin miscibility is good, can be B-stage reaction, gel time is long, fast crosslinking speed. Crosslinked at 100 ℃ for 1h, the shear strength of up to 25MPa; such as by 150 ℃ cross-linking 30min, shear strength up to 27MPa.
There are many varieties of organic urethane accelerators, mostly asymmetric substituted urea, such as N-p-chlorophenyl N ', N'-dimethylurea. Such accelerator can reduce the dicyandiamide exothermic peak from 200 ℃ to 150 ℃, the crosslinking reaction can be carried out at 120 ℃, but the storage period is shortened, only about a month, can be used film encapsulation method and dicyandiamide To extend the period of use. In addition, 100 parts of bisphenol A type epoxy resin (epoxy equivalent 190), 20 parts of dicyandiamide and 3 parts of 3,4-Cl (phCH20) C6H5NHC --- ON (CH3) were reported in the literature, Has a good storage, storage period of up to 6 months or so.
Imidazole and its derivatives can be used as dicyandiamide crosslinking accelerator, the current domestic powder coating plant formulations using dicyandiamide imidazole system. Of course, imidazoles and their derivatives themselves can also be used as latent cross-linking agents.
The imidazole compounds used as accelerators include 2-methylmilazole, 2-ethylmycin, 2-phenylmilazole, 2-undecylmilazole, 2-heptadecylmilazole and the like. Organic guanidine compounds are effective promoters of dicyandiamide, and their varieties are also many, such as tetramethylguanidine, acyl substituted guanidine, alkyl-substituted guanidine and so on.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
In addition, more research focus is to find an effective accelerator, without compromising the use of life and performance under the premise of trying to reduce the cross-linking temperature, the ideal situation is reduced to about 120 ℃. There are many varieties of accelerators, mainly urea derivatives, imidazole derivatives, organic guanidine derivatives, etc., are not enumerated.
Dicyandiamide derivatives are HT-2833, HT-2844, such cross-linking agent and epoxy resin miscibility is good, can be B-stage reaction, gel time is long, fast crosslinking speed. Crosslinked at 100 ℃ for 1h, the shear strength of up to 25MPa; such as by 150 ℃ cross-linking 30min, shear strength up to 27MPa.
There are many varieties of organic urethane accelerators, mostly asymmetric substituted urea, such as N-p-chlorophenyl N ', N'-dimethylurea. Such accelerator can reduce the dicyandiamide exothermic peak from 200 ℃ to 150 ℃, the crosslinking reaction can be carried out at 120 ℃, but the storage period is shortened, only about a month, can be used film encapsulation method and dicyandiamide To extend the period of use. In addition, 100 parts of bisphenol A type epoxy resin (epoxy equivalent 190), 20 parts of dicyandiamide and 3 parts of 3,4-Cl (phCH20) C6H5NHC --- ON (CH3) were reported in the literature, Has a good storage, storage period of up to 6 months or so.
Imidazole and its derivatives can be used as dicyandiamide crosslinking accelerator, the current domestic powder coating plant formulations using dicyandiamide imidazole system. Of course, imidazoles and their derivatives themselves can also be used as latent cross-linking agents.
The imidazole compounds used as accelerators include 2-methylmilazole, 2-ethylmycin, 2-phenylmilazole, 2-undecylmilazole, 2-heptadecylmilazole and the like. Organic guanidine compounds are effective promoters of dicyandiamide, and their varieties are also many, such as tetramethylguanidine, acyl substituted guanidine, alkyl-substituted guanidine and so on.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
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