Synthetic method and application of urea monomer modified hydroxyl acrylic emulsion
A synthesis method and technology of hydroxybenzene, applied in the direction of coating, etc., can solve the problems of poor orientation, poor storage stability, and aggregation of glitter pigments, and achieve good ethanol wiping resistance, simple and easy method, and good repeatability.
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[0025] Example 1
[0026]
[0027] The polymerization process:
[0028] 1. After washing the reaction kettle, add the bottom material and heat to 78°C.
[0029] 2. At 78°C, add 5% of the nuclear layer monomer pre-emulsion to the reactor, and wait for 5 minutes for the temperature to recover.
[0030] 3. Add 25% initiator solution, keep it for 15 minutes after the blue light appears, and then add the remaining 75% core monomer pre-emulsion, keep it for 30 minutes.
[0031] 4. At the same time, drop the remaining shell monomer pre-emulsion and initiator solution for 2.5 hours.
[0032] 5. After the feeding is completed, the temperature is increased to 85°C and the temperature is maintained for 30 minutes.
[0033] 6. Cool down and neutralize to pH=8.0, filter and discharge.
[0034] Used for low-temperature baking aluminum powder paint formula on ABS plastic
[0035]
[0036] Performance indicators of the above coatings:
[0037] Pencil hardness (70℃, 30min): ≥HB;
[0038] Pencil hardness (7 ...
Example Embodiment
[0042] Example 2
[0043]
[0044] The process steps of the production method are the same as in Example 1, wherein the temperature in step 2 is 80° C., and the dropping time in step 4 is 3 hours.
[0045] Used for self-drying white paint formulations on urea-formaldehyde plastics
[0046]
[0047] Performance indicators of the above paint:
[0048] Surface dry time: 45min;
[0049] Working time: 4.5h
[0050] Pencil hardness (7 days): ≥H
[0051] Adhesion (cross-cut method): 13% off
[0052] Water resistance (normal temperature): 48h without whitening
[0053] Gloss (60 。 ): 70
[0054] Alcohol resistance (500g weight): ≥50 times.
Example Embodiment
[0055] Example 3
[0056]
[0057] The process steps of the production method are the same as in Example 1, wherein the temperature in step 2 is 80° C., and the dropping time in step 4 is 3.5 h.
[0058] Used for low temperature self-drying paint formula on ABS plastic
[0059]
[0060] Performance indicators of the above paint:
[0061] Tack-free time: 35min;
[0062] Working time: 5h
[0063] Pencil hardness (7 days): ≥H
[0064] Adhesion (cross-cut method): 10% off,
[0065] Water resistance (normal temperature): No whitening in 48h.
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