News Details
Coating with phenolic modified amine crosslinking agent
2017-4-2 11:38:23
Coating with phenolic modified amine crosslinking agent, manny (Mannich reaction. The amine mainly ethylenediamine, divinyl three amine, hexamethylenediamine, m-phenylene diamine and benzene dimethylamine, etc. Such modified amine belong to the category of phenolic modified amine. Crosslinking agent molecules containing lively phenolic hydroxyl and amine hydrogen, greatly strengthen the reactivity, increased amino and speed of the crosslinking reaction of epoxy groups.
Are highly network crosslinking structure. At the same time with phenolic skeleton structure. Further improved heat distortion temperature, improved resin crosslinking content itself insufficient heat resistance, corrosion resistance, so it is widely used in crosslinking anticorrosive coating, adhesive, laminated material and glass fiber reinforced plastic production, etc.
Phenolic modified amine crosslinking agent synthesis method has two kinds:
(1). One-step: phenol, amine and aldehyde of reaction raw materials on the basis of the molar ratio of a certain input in the reaction kettle, were synthesized under the condition of the proper operation of modified amine crosslinking agent.
(2). Two steps: phenol and aldehyde condensation into low molecular weight resin, and then react with amine liquid aldehyde imine, this method is the key to grasp the weight ratio of phenol and aldehyde.
Generate a very low molecular weight of resin. Otherwise the addition reaction with amino compound butcher to amine value is low, and liquidity is poor.
Fear two process routes to synthesize modified amine. But the latter practice is difficult, long production cycle, product quality is not stable, the former is simple and easy to control, stable process, short production cycle, only 6-8 h/batch, high utilization rate of equipment, manufacturers are using one-step production at present.
Current commercially available crosslinking agent, such as JA - l, 701, 702703703 - A, no.t31.welcome all belong to the category of phenolic modified amine, but the same product, different manufacturers process control parameters, and add the appropriate additives.
Manny phase of the reaction of phenol can be modified to improve the toughness of resin crosslinking content. For example, according to the classical organic chemistry olefins in its hydrocarbon on the principle of substitution reaction, using the phenol on the aromatic ring by the base adjacent to the registration of the three active hydrogen position an introduction with conjugate double-bond flexible long chain.
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).
The remaining two lively hydrogen position can still happen, loch reaction. The resulting modified with epoxy cross-linking, long chain more sex of the crosslinking agent molecules participate in crosslinking structure. Greatly improve the resin crosslinking the inner parts of bolt and flexibility, higher adhesion and sticky relay.
M-phenylene diamine production methods mainly manufactured dinitrobenzene between reduction method.
Benzene by the mixed acid nitration into rooms, neighborhood, on a mixture of dinitrobenzene, then through dinitrobenzene between sodium sulfite and liquid alkali refining, and then use iron powder reduction or hydrogenation reduction phenylenediamine was prepared.
1) iron powder reduction method: first of all in reaction kettle with stirrer, add iron powder and hydrochloric acid and heat activation. Add dinitrobenzene between reduction reaction, the temperature control in 98-102 ℃; End of reaction, and soda ash to PH value of 9, vacuum suction filter, the filtrate with hot water washing, the vacuum evaporation under the condition of 65 ℃ and 0.03 MPa. Pioneer water after steaming, distillation vacuum 0.09 0.05 MPa, when temperature is 170-180 ℃, get the product.
2) hydrogenation reduction method: between two nitrobenzene reduction can use pure hydrogen or hydrogen nitrogen containing 70% hydrogen for hydrogenation, using two or four yuan rainie nickel as catalyst dosage (20%), with ethanol as solvent, the 110-120 ℃, hydrogen pressure, 3.43 to 4.41 MPa, circulation superficial velocity per 0.044 square, under the condition of cubic for tower fluidized bed hydrogenation; Then through reduced pressure distillation, a quick qualified products, yield of 90% 95%. Reaction equations are as follows:
Direct ammoniation method: 3) aniline with nickel and nickel oxide as catalyst, aniline and ammonia reaction temperature is 250-250 ℃, the reaction pressure of 29.4 to 29.4 kPa, direct response, get m-phenylene diamine as the main product of crude benzene diamine product, but the yield of less than 10%.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
Are highly network crosslinking structure. At the same time with phenolic skeleton structure. Further improved heat distortion temperature, improved resin crosslinking content itself insufficient heat resistance, corrosion resistance, so it is widely used in crosslinking anticorrosive coating, adhesive, laminated material and glass fiber reinforced plastic production, etc.
Phenolic modified amine crosslinking agent synthesis method has two kinds:
(1). One-step: phenol, amine and aldehyde of reaction raw materials on the basis of the molar ratio of a certain input in the reaction kettle, were synthesized under the condition of the proper operation of modified amine crosslinking agent.
(2). Two steps: phenol and aldehyde condensation into low molecular weight resin, and then react with amine liquid aldehyde imine, this method is the key to grasp the weight ratio of phenol and aldehyde.
Generate a very low molecular weight of resin. Otherwise the addition reaction with amino compound butcher to amine value is low, and liquidity is poor.
Fear two process routes to synthesize modified amine. But the latter practice is difficult, long production cycle, product quality is not stable, the former is simple and easy to control, stable process, short production cycle, only 6-8 h/batch, high utilization rate of equipment, manufacturers are using one-step production at present.
Current commercially available crosslinking agent, such as JA - l, 701, 702703703 - A, no.t31.welcome all belong to the category of phenolic modified amine, but the same product, different manufacturers process control parameters, and add the appropriate additives.
Manny phase of the reaction of phenol can be modified to improve the toughness of resin crosslinking content. For example, according to the classical organic chemistry olefins in its hydrocarbon on the principle of substitution reaction, using the phenol on the aromatic ring by the base adjacent to the registration of the three active hydrogen position an introduction with conjugate double-bond flexible long chain.
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).
The remaining two lively hydrogen position can still happen, loch reaction. The resulting modified with epoxy cross-linking, long chain more sex of the crosslinking agent molecules participate in crosslinking structure. Greatly improve the resin crosslinking the inner parts of bolt and flexibility, higher adhesion and sticky relay.
M-phenylene diamine production methods mainly manufactured dinitrobenzene between reduction method.
Benzene by the mixed acid nitration into rooms, neighborhood, on a mixture of dinitrobenzene, then through dinitrobenzene between sodium sulfite and liquid alkali refining, and then use iron powder reduction or hydrogenation reduction phenylenediamine was prepared.
1) iron powder reduction method: first of all in reaction kettle with stirrer, add iron powder and hydrochloric acid and heat activation. Add dinitrobenzene between reduction reaction, the temperature control in 98-102 ℃; End of reaction, and soda ash to PH value of 9, vacuum suction filter, the filtrate with hot water washing, the vacuum evaporation under the condition of 65 ℃ and 0.03 MPa. Pioneer water after steaming, distillation vacuum 0.09 0.05 MPa, when temperature is 170-180 ℃, get the product.
2) hydrogenation reduction method: between two nitrobenzene reduction can use pure hydrogen or hydrogen nitrogen containing 70% hydrogen for hydrogenation, using two or four yuan rainie nickel as catalyst dosage (20%), with ethanol as solvent, the 110-120 ℃, hydrogen pressure, 3.43 to 4.41 MPa, circulation superficial velocity per 0.044 square, under the condition of cubic for tower fluidized bed hydrogenation; Then through reduced pressure distillation, a quick qualified products, yield of 90% 95%. Reaction equations are as follows:
Direct ammoniation method: 3) aniline with nickel and nickel oxide as catalyst, aniline and ammonia reaction temperature is 250-250 ℃, the reaction pressure of 29.4 to 29.4 kPa, direct response, get m-phenylene diamine as the main product of crude benzene diamine product, but the yield of less than 10%.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Diethyl toluene diamine(DETDA) http://www.yaruichem.com
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