Method for preparing epoxy-modified polyacrylate emulsion special for water-based industrial paint
A technology of polyacrylate emulsion and epoxy modification, which is applied in coatings and other directions, can solve problems such as high technical transformation requirements, lower resin performance, and limit product application fields, and achieve a broad market share, high hardness improvement, and reasonable process Effect
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example I
[0018] Example 1, get sodium lauryl sulfonate 3.48g, disodium hydrogen phosphate 0.5g, and secondary alkanol polyoxyethylene ether 1.64g is dissolved in 205g water and makes the emulsifier of pre-emulsion and water mixed solution. Another 20g of epoxy resin (AL-3040) was dissolved in 400g of reactive monomers (among them: 120g of butyl acrylate, 296.1g of methyl methacrylate, 15.3g of acrylic acid, and 8.6g of methylol acrylamide). Epoxy-monomer mixture. Place the emulsifier-water mixture under 600 (rev / min) stirring, then slowly add the epoxy resin-monomer mixture into the pre-emulsion tank for high-speed dispersion, stir for 30 minutes, and set aside. Add 308g water in reactor, get sodium dodecyl sulfonate 2.13g, secondary alkanol polyoxyethylene ether 1.28g, when temperature in reactor rises to 8 0 At -90°C, feed nitrogen, weigh 4% of the pre-emulsion and add it to the reactor, and add 60% of the initiator. After reacting for 10 minutes, mix the remaining epoxy-monomer pre...
example 2
[0019] Example 2: Take 200g of the epoxy-modified polyacrylic acid emulsion obtained in "Example I", add 2.73g of epoxy resin curing agent (ANCAMN2264) and stir evenly, spray it on a glass plate, and put it in an oven at 120-130°C for drying Bake for 30 minutes, test after standing at room temperature for 1 hour, its resistance to 50% ethanol can reach 36 hours without any abnormal phenomenon, its hardness can reach more than 2H, and its resistance to salt spray can exceed 550 hours.
example 3
[0020] Example 3: Get fatty alcohol ether sulfosuccinate sodium salt 3.45g, disodium hydrogen phosphate 0.5g, and secondary alkanol polyoxyethylene ether 1.48g is dissolved in the water of 205 to make the emulsifier of pre-emulsion and water mixed solution . In addition, 20g of epoxy resin (AL-3040) was dissolved in 400g of reaction monomers (wherein: butyl acrylate 93g, methyl methacrylate 270.8g, acrylic acid 15.3g, methylol acrylamide 8.6g, methacrylate Glycidyl acrylate 12.3g) made epoxy-monomer mixed solution. Add 308g of water to the reaction kettle, take 6.45g of fatty alcohol ether sulfosuccinate sodium salt, 1.73g of secondary alkanol polyoxyethylene ether, and the rest are operated according to "Example I". After the reaction, the solid content is about 45% epoxy-modified polyacrylic acid emulsion, the epoxy equivalent is 4.5-5.5, and the storage time is more than 6 months. The application test is operated according to "Example 2". The test results show that the re...
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