A kind of graft emulsion and preparation method thereof
An emulsion and solvent technology, applied in the field of coatings, can solve the problems of salt spray of paint film, inability to balance cupping performance during aging time, uneven distribution, etc., and achieve the effect of long aging time, good cupping performance and long time.
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[0025] This specific embodiment also proposes a method for preparing the above-mentioned graft emulsion, which includes the following steps: according to the proportion of each component, methyl methacrylate, butyl acrylate, hydroxyethyl methacrylate, glycidyl methacrylate, benzene Mix ethylene and the first azobisisobutyronitrile, drop the modified epoxy resin at 98~105℃, keep the temperature for 1-2 hours, and then continue to drop the first solvent and the second azo at 98~105℃ The diisobutyronitrile mixture was kept for 1-2 hours; after the insulation, methylethanolamine and diethanolamine were added to the reaction kettle, and the temperature was raised to 110-120°C and kept for 2-3 hours; then the temperature was lowered to 65-70°C and continued to add The plasticizer, the blocking cross-linking agent and the organic acid are mixed, and water is continuously added and mixed to obtain the graft emulsion.
[0026] Further, the preparation method proposed by this specific e...
Embodiment 1
[0029] A closed cross-linking agent is prepared by the following steps:
[0030] According to the mass percentage calculation in the reaction flask, add isocyanate, 15% third solvent methyl isobutyl ketone and 0.02% organotin catalyst, pass nitrogen, start stirring, heat up to 40 ° C, add octanol dropwise, during the reaction , the temperature of the reaction flask does not exceed 70 ℃, and the isocyanate content is detected to be less than 0.5% after dripping, and then 4.88% of the third solvent methyl isobutyl ketone is added to obtain a blocking crosslinking agent; isocyanate and -OH-containing blocking agent are based on the quality When the ratio is 1:1.05, the total amount of isocyanate and -OH-containing blocking agent accounts for 80% of the total mass of the raw materials.
Embodiment 2
[0032] A closed cross-linking agent is prepared by the following steps:
[0033] According to the mass percentage calculation in the reaction flask, add isocyanate, 6% third solvent methyl isobutyl ketone and 0.04% organotin catalyst, pass nitrogen, start stirring, heat up to 45 ℃, add the blocking agent octanol dropwise, During the reaction, the temperature of the reaction flask did not exceed 70 ° C, and after the dripping, the isocyanate content was detected to be less than 0.5%, and then 3.96% of the third solvent methyl isobutyl ketone was added to obtain a closed crosslinking agent; isocyanate and octanol were in a mass ratio of 1. : The ratio of 1.05 is put in, and the total amount of isocyanate and octanol accounts for 90% of the total mass of the raw materials.
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