Method for preparing epoxy-modified polyacrylate emulsion special for water-based industrial paint

Abstract

The invention discloses a method for preparing epoxy-modified polyacrylate emulsion specially used for water-based industrial paints, which includes material preparation, emulsification treatment and polymerization reaction. The emulsion is prepared by emulsifying under stirring to form an epoxy-monomer pre-emulsion, and then adding an initiator under certain process conditions to make it react to form an epoxy-modified polyacrylate emulsion. The average particle size of the emulsion is not about 100μ, and the storage stability, solvent resistance, salt spray resistance and hardness are all good, and its storage time can exceed 6 months or even exceed one year. When applied to water-based glass baking varnish, its resistance to 50% ethanol can reach 48 hours without abnormal phenomenon, its hardness can reach more than 3H, and its resistance to salt spray can exceed 650 hours. The process is stable in polymerization, and at the same time, it does not require high stirring speed during epoxy-monomer mixing, emulsification and polymerization, which is extremely beneficial to industrial production.

Description

technical field

[0001] The invention relates to a preparation technology of an epoxy-modified polyacrylate emulsion that can be used as a water-based glass baking varnish in the field of high molecular polymers. Background technique

[0002] Epoxy-modified polyacrylate emulsion can be used as high-performance water-based glass baking varnish after adding epoxy resin curing agent. In order to improve its stability, solvent resistance, hardness, and salt spray resistance, not much research work has been done at home and abroad, and there are fewer articles and patents for water-based industrial paints.

[0003] A kind of method for preparing epoxy-polyacrylate emulsion is proposed in Chinese patent CN91110581.6, and this method can be summarized as: 1. epoxy resin dilution, emulsification method; 2. the polymerization mode of epoxy modified acrylic acid emulsion, when using Adding a curing agent can be used for bonding multi-layer plastic films. The essence of this method is...

Examples

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...

technical field

[0001] The invention relates to a preparation technology of an epoxy-modified polyacrylate emulsion that can be used as a water-based glass baking varnish in the field of high molecular polymers. Background technique

[0002] Epoxy-modified polyacrylate emulsion can be used as high-performance water-based glass baking varnish after adding epoxy resin curing agent. In order to improve its stability, solvent resistance, hardness, and salt spray resistance, not much research work has been done at home and abroad, and there are fewer articles and patents for water-based industrial paints.

[0003] A kind of method for preparing epoxy-polyacrylate emulsion is proposed in Chinese patent CN91110581.6, and this method can be summarized as: 1. epoxy resin dilution, emulsification method; 2. the polymerization mode of epoxy modified acrylic acid emulsion, when using Adding a curing agent can be used for bonding multi-layer plastic films. The essence of this method is...

Examples

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...