Amino-terminated dihydroxyl modified epoxy resin as well as preparation method and application thereof
A kind of amine-terminated double hydroxyl, epoxy resin technology, applied in the field of coatings, can solve the problem of poor edge anti-corrosion performance
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Embodiment 1
[0156] This example discloses an amino-terminated dihydroxyl-modified epoxy resin, the raw material components of which are shown in Table 1, wherein the dihydroxyl monomers include bisphenol A and Benzoylecgonine Hapten, and Benzoylecgonine Hapten is bisphenol A polyether alcohol. The main chain of the polyether amine is poly fatty ether structure, the terminal active functional group is a polymer of amine groups, and the molecular weight of the polyether amine is 200-400.
[0157] Table 1
[0158]
[0159]
[0160] The preparation process includes: adding NPEL-128 into a 1L separate glass reaction vessel equipped with a stirrer, a reflux condenser and a temperature controller, stirring and raising the temperature to 130°C. After reaching the temperature, add Benzoylecgonine Hapten, bisphenol A and bis-diethylene glycol butyl ether formal, then add benzyl dimethylamine as a catalyst, and keep the temperature at 130-150°C for 2 hours. Afterwards, add polyetheramine, ke...
Embodiment 2
[0167] This example discloses a cationic electrophoresis resin emulsion (abbreviation: cationic electrophoresis resin emulsion I) and its application. The raw material of cationic electrophoresis resin emulsion I includes the amino-terminated dihydroxyl modified epoxy resin prepared in Example 1. The ingredients are shown in Table 2:
[0168] Table 2
[0169] Element parts by weight Amino-terminated dihydroxyl modified epoxy resin 159.50 Thermal deblocking type isocyanate curing agent Ⅰ 128.59 lactic acid 11.96 pure water 564.87 BYK-3480 5.05
[0170] Among them, BYK-3480 is BYK leveling and anti-pitting agent.
[0171] The preparation process includes: Adding amino-terminated dihydroxyl-modified epoxy resin and heat-unblocking isocyanate curing agent I into a 1L separate glass reaction vessel equipped with a stirrer, reflux condenser and temperature controller, and stirring to raise the temperature to 65~75℃, add BYK-3480, stir f...
Embodiment 3
[0179] This example discloses a cationic electrophoresis resin emulsion (abbreviation: cationic electrophoresis resin emulsion II) and its application. The raw material of cationic electrophoresis resin emulsion II includes the amino-terminated dihydroxyl modified epoxy resin prepared in Example 1. The difference from Example 2 is that the curing agent adopts thermal deblocking type isocyanate curing agent II.
[0180] The prepared cationic electrophoresis resin emulsion II is slightly light yellow milky white liquid with a solid content of 34-37%, a pH value of 5.7-6.3 and an electrical conductivity of 2000-2800 μS / cm.
[0181] This example discloses a cathodic electrophoretic paint, which differs from Example 2 in that its raw material includes the cationic electrophoretic resin emulsion II prepared in this example.
[0182] In the prepared cathodic electrophoretic paint, the solid content is 18-20%, the pH value is 5.5-5.8, and the conductivity is 1000-1500 μS / cm.
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Abstract
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