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Three - grade amine coating crosslinking agent
2017-8-7 23:35:49
Three - grade amine coating crosslinking agent
The cross-linking mechanism of the three-stage amine coating crosslinking agent: the reaction activity of the 3 - level amine to the epoxy resin (glycidyl ether) is large, and the epoxidated olefins are not effective. Its cross-linking mainly focuses on ether, and the shrinkage rate is small.
The N lone pair on the tertiary amine crosslinking agent is the C delta + on the epoxy base, forming the negative ion center. This process is often in the hydroxyl (such as bisphenol A epoxy resin containing - OH) or other to protons, under the catalysis of C - O key polarization, is advantageous to the delta C + and tertiary amine to form ions to the active center (chain). The second epoxy group can be inserted into the positive negative ion pair to form a negative ion center transfer and complete the chain termination. For example: triethylamine catalyzed phenyl glycidyl ether crosslinking.
The main factors that determine the activity of the tertiary amine are the space resistance effect of N substituents, and N electron cloud density, in which the phase resistance effect of the substituent group is more active to the tertiary amine. Fat, therefore, the primary amine in the crosslinked epoxy resins, active hydrogen consumption and into the tertiary amine, because of the space steric hindrance, no longer have form of tertiary amine catalytic epoxy group open loop, is annulled.
A typical three-stage amine crosslinking agent
A. Triethylamine (TEA) : colorless liquid, dosage of 10-15%, 6 days at room temperature crosslinking. Structure: N (C2H5) 3
B. Triethanolamine (oily liquid) : the dosage of 12-15%, 80-100 ℃ needs 2-4 hours and crosslinking. Structure: N (C2H2OH) 2
C. Benzyl dimethylamine: colorless liquid, 10-15%, 80-100 ℃ needs 2-4 hours and crosslinking.
D. Dimethylaminomethyl phenol (DMP - 10 #) : oil - like liquid, used in 16%
E. 2, 4, 6 -- (N, N -- dimethyl aminomethyl) phenol (dmp3 -- 30)
Oily liquid, dosage of 5-10%.
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).
One or more of the molecules in ammonia are substituted by a hydrocarbon, called amine. According to the number of hydrogen atoms in amine molecules, the amine is divided into beramine, secondary amine and tertiary amine. For example: CH3CH2NH2 (bermide) (CH3CH2) 2NH (CH3CH2) 3N (tertiary amine)
The hydrogen in the ammonia is substituted by the alkyl group.
An amine can be a derivative of H that is substituted by alkyl in ammonia. Amines are widely exist in nature, have very important physiological activity and biological activity, such as many proteins, nucleic acids, hormones, antibiotics and alkaloids are amine complex derivatives, such as the clinical use of most of the drugs or amine derivative and amine, so master amine properties and synthesis methods is to study the complicated natural products and better safeguard the foundation of human health.
According to the number of hydrogen substituted, it is divided into primary amine (beramine) RNH2, secondary amine (secondary amine) R2NH,
Tertiary amine (tertiary amine) R3N, quaternary ammonium salt (quaternary ammonium salt) R4N + X -, such as methylamine CH3NH2, aniline C6H5NH2, ethylenediamine H2NCH2CH2NH2 and diisopropylamine (CH3) 2 ch 2 nh, triethanolamine (HOCH2CH2) 3 n, tetrabutyl ammonium bromide (CH3CH2CH2CH2) 4 n + Br -. Four hydroxyl ammonium hydroxide or ammonium salt of replacing, called quaternary amine alkali (quaternary ammonium hydroxide) or quaternary ammonium salt (quaternary ammonium salt). NH4 + ammonium R4NOH quaternary ammonium salt
Depending on the type of hydroxyl that is linked to nitrogen atoms in an amine molecule, the amine can be classified as fatty amine and aromatic amine. If an amine molecule contains two or more amino groups (- NH2), it can be divided into binary amine and triamine based on the number of amino groups.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
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