News Details
Imidazole type paint crosslinking agent
2017-7-11 19:48:51
Imidazole type paint crosslinking agent molecular structure containing secondary amine and tertiary amine, so it can be used on the secondary amine active hydrogen involved in the addition of epoxy groups, but also the use of tertiary nitrogen atoms, as anionic polymerization Type cross - linking agent cross - linked epoxy resin.
Imidazole type cross-linking agent can be crosslinked with epoxy resin alone, or as a crosslinking agent for other crosslinking agents such as dicyandiamide, anhydride and phenolic resin.
Compared with other cross-linking agent, the use of less, in the short temperature can be cross-linked epoxy resin, cross-linked heat distortion temperature is high. And epoxy resin complexes longer period of application, but also can be seen as a latent cross-linking agent.
Imidazole type cross-linking agent has the disadvantage of: a certain degree of volatility and hygroscopicity, many imidazole compounds for the high melting point of the crystal, mixed with liquid epoxy resin difficult, poor process. Thus, various imidazole compounds are present.
Imidazole compounds: imidazole: molecular formula C3H4N2, relative molecular mass 68, direct use of it as a cross-linking agent less, you can use it to prepare other epoxy resin cross-linking agent.
2-methylimidazole: Molecular formula C4H6N2, relative molecular mass of 82.
1-benzyl-2-ethylimidazole: Structural formula, relative molecular mass 186, which is a pale yellow liquid with a relative density of 1.054 and a melting point of 20 ° C. Can be any proportion with methanol, xylene mixed, insoluble in water. Can be used alone as a cross-linking agent, can also be used as a promoter. When used as a promoter for dicyandiamide over organic acid anhydride, compared with other tertiary amines, the application period is long, the crosslinking reaction speed is fast, and the heat resistance of the crosslinked matter is high.
1-aminoethyl-2-methylimidazole (AMZ): The crosslinking agent has the following characteristics (1) does not solidify at low temperature, still maintain the liquid state, colorless, odorless liquid. (2) the amount of 1 ~ 8mrp, you can play its excellent results. (3) and epoxy resin composition for a very long period of time, good process. (4) The crosslinked product having a high heat distortion temperature can be obtained by thermally crosslinking the composition for a short period of time. (5) low volatility.
Chinese name: Diethyl toluene diamine(DETDA)Chinese alias: aryl, aryl diethyl - aryl - methyl-p-phenylenediamine
English name: Benzenediamine, ar, ar-diethyl-ar-methyl-English aliases:Diethyltoluenediamine; ar, ar-Diethyl-ar-methylbenzenediamine;Diethylmethylbenzenediamine;
CAS No. :68479-98-1
EINECS No. :270 -877-4
Molecular formula: C11H18N2
Molecular Weight: 178.28
Boiling point: 310 ℃
Refractive index: 1.581
Flash Point: > 140 ℃
Inchi: InChI = 1/C11H18N2/c1-4-8-6-7 (3) 10 (12) 11 (13) 9 (8) 5-2/h6H ,4-5,12-13H2 ,1-3H3 density : 1.022
Risk Codes: R10; R35
RIDADR: UN 3082
Safety instructions: S2; S26; S39; S61
Packing Group: III
Hazard Class: 6.1
2-ethyl-4-methylimidazole (2E4MZ, 2,4-EMI): liquid at room temperature, when in the supercooled state will appear crystal, is used as a wide range of imidazole compounds. Acid anhydride cross-linking agent often use the goods as a promoter. And the flame retardant organic halide, phosphate ester compounds to produce bromide, affecting cross-linking.
2-ethyl-4-methylimidazole is easily mixed with liquid epoxy resin at room temperature to obtain a lower viscosity mixture, the longer application period, the cross-linked material has a higher heat distortion temperature. Dosage 2%.
Imidazole adduct. Imidazole and epoxy resin (or epoxy compound) adduct
The imidazole compounds can crosslink the epoxy resin at a relatively low temperature for a short time to obtain a heat-resistant cross-linker. In the presence of a tertiary amine group, it can be used as an acid anhydride, dicyandiamide and other Synergist.
Imidazole and isocyanate adduct. Is the use of imidazole closed isocyanate, the adduct can be reduced imidazole crosslinking temperature, while extending the application of cross-linking agent. Can be dissociated into isocyanate and imidazole compounds at 70 to 110 ° C, and the regenerated imidazole compound and the isocyanate can react together with the epoxy resin: the regenerated imidazole compound first opens the epoxy group and forms the hydroxyl group and reacts with the isocyanate.
Imidazole compound with an organic acid. It is possible to improve the storage property of the epoxy composition or the low temperature crosslinkability.
The reaction product of imidazole compound with urea. The crosslinking agent has excellent electrical properties, mechanical properties, and the application period is long.
Imidazole metal salt complex. No effect is promoted at room temperature, but after heating to a temperature, the complex dissociates into an imidazole compound and a metal salt, and the imidazole compound promotes the crosslinking reaction.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
Spanish
French
Italian
Portuguese
Japanese
Korean
Arabic
Russian