Coating water dispersoid crosslinking agent

Coating water dispersoid crosslinking agent,With two imine or nitrogen containing carbon c, some crosslinking agent. Acetyl acetoxyl group and diamine can react quickly at room temperature, but the acetyl acetoxyl group easy hydrolysis in water, can react with ammonia or primary amine, converted to enamine (enamine) becomes stable.

Acetoxyl group (Acetoxy group) is a - O - C (= O) - CH3 structure of functional groups, is used to protect alcoholic hydroxyl. After removing acetic acid molecules on hydroxyl hydrogen atoms, one price for the rest of the group.

Amine is hydroxyl derivatives of ammonia, according to amino nitrogen atoms in the connection by hydroxyl number can be divided into primary amine, secondary amine and tertiary amine, if connected with four hydroxyl, quaternary ammonium compounds, including hydroxyl number from 1 to primary amine. According to the number of amino in primary amine, and can be divided into one yuan amine, diamine, and multiple amine.
 
According to different nitrogen atoms connected alkyl aromatic primary amine and primary amine can be divided into fat. Primary amine weakly alkaline, fat primary amine alkali than ammonia, and primary amine aromatic primary amine alkali generally lower than fat. Primary amine is a kind of nature of active compounds, as a result of nitrogen atoms are not altogether electron pair, can be used as nucleophilic reagents involved in many reactions, such as alkylation, acyl, sulfonyl, and reactions of carbonyl compounds and the oxidation reaction, at the same time also can react with nitrite to generate a variety of different compounds.

Carbon 2 imine (Carbodiimide), N = C = N functional groups, is a kind of commonly used water loss. Generally by thiourea method for preparing or urea water loss, hydrolysis of urea derivatives. Mainly for the activation of carboxyl, amide and the formation of ester.

In organic synthesis, carbon 2 imine is a kind of commonly used agent, mainly used for activation of carboxyl, amide and the formation of ester. Reactions often join N - hydroxy benzene and three azole nitrogen or N - hydroxy succinimide, can improve the production rate, reduce the occurrence of adverse events. Two imine reaction with amine can also generate carbon guanidine.

Carboxylic acid and amine in carbon 2 imine loss of water condensation reaction under the diagram below. Carboxylic acid with carbon 1 2 O - imine reaction generated intermediates acyl thiourea 2, similar to the introduction of carboxylic acid ester base activation. Then 2 reaction with amine to produce the target product urea 3 and 4. 2 can generate reaction with another molecular carboxylic acid anhydride 5, has also been anhydride reaction with amine amides 3.




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).


A byproduct of mainly 2 rearrangement of N - acylurea 6. Using low dielectric constant of solvent such as methylene chloride, chloroform) can reduce the generation of 6.

DCC (dicyclohexyl carbon imide) is one of the first to use carbon 2 imide, mostly used in peptide synthesis of peptide step. DCC as the reaction yield of water loss is very high, and is not expensive reagent.

EDC (1 - (3 - dimethyl amino propyl) - 3-2 ethyl carbon imine hydrochloride) is a water soluble carbon 2 imide, in amide synthesis is used as carboxylic activation reagent, also used in activated phosphate groups, and protein and nucleic acid of crosslinking and immune accidentally even the making of things. When using the pH range of 4.0 to 4.0, with N - hydroxy succinimide (NHS) or N - hydroxy succinimide and, in order to improve coupling efficiency.

4 - dimethyl amine organic chemistry with EDC and catalyst pyridine (DMAP) result in the esterification of carboxylic acids and alcohols.
N propyl organism is tasted a colorless liquid, ammonia smell, freezing point - 74 ℃, b.p. 55 and 56 ℃, n25D 1.4123, relative density 0.832 (24 ℃), f.p. 12 ℃, can miscibility with water, but soluble in ethanol, alkaline aqueous solution, acid or absorb carbon dioxide is easy aggregation, commodity ring) contains a small amount of sodium hydroxide as a stabilizer.

Enamine is aldehydes or ketones with secondary amine water condensation to form a kind of unsaturated compounds, can be seen as nitrogen enol, general formula for R2C = CR - NR2.

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Diethyl toluene diamine(DETDA)  http://www.yaruichem.com