Modified waterborne alkyd resin and preparation method thereof
A technology of water-based alkyd resin and modified resin, which is applied in coatings, anti-corrosion coatings, etc., can solve the problems of easy precipitation of phenolic resin particles, incomplete reaction grafting, etc., and achieve good neutral salt spray resistance and water resistance Good results
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[0016] The invention provides a kind of preparation method of modified water-based alkyd resin, comprising the following steps:
[0017] S1, adding linoleic acid, benzoic acid, polyacids, and polyols to the reaction kettle, and reacting at 240-260°C for a period of time;
[0018] S2, cooling the product of step S1 to 200-220°C, and then adding a modified resin to continue the reaction, the modified resin being selected from one or more of phenolic resin, novolac epoxy resin and epoxy phenolic resin kind;
[0019] S3, when the acid value of the reaction product in step S2 reaches 7 mgKOH / g-15 mgKOH / g, adding trimellitic anhydride, optionally adding xylene, to carry out the reaction;
[0020] S4, when the acid value of the reaction product in the step S3 reaches 35 mgKOH / g-40 mgKOH / g, lower the temperature and add a co-solvent and a neutralizing agent to prepare a modified water-based alkyd resin.
[0021] It is worth mentioning that "optionally adding xylene" means that xylen...
Embodiment 1
[0034] The preparation method of phenolic modified water-based alkyd resin:
[0035] Add 45 parts by mass of linoleic acid, 5 parts by mass of benzoic acid, 12 parts by mass of maleic anhydride, and 10 parts by mass of pentaerythritol into the reactor, stir and heat up to 160-180°C, react for 3-4 hours, and then Raise the temperature to 240-250°C, react for 5-6 hours; then cool down to 200-220°C, add 5 parts by mass of phenolic resin, and when the acid value of the reactant reaches 7mgKOH / g-15mgKOH / g, cool down to 160-170 ℃; then add 3 parts by mass of trimellitic anhydride and 2 parts by mass of xylene, then raise the temperature to 175-185 °C, and react for 1-2 hours. When the acid value of the reactant reaches 35 mgKOH / g-40 mgKOH / g, cool down to 170 °C ; Then add 25 parts by mass of co-solvent ethylene glycol monobutyl ether, keep warm for 20-50 minutes; then cool down to 90°C, add 6 parts by mass of neutralizing agent, stir evenly to obtain the product.
Embodiment 2
[0037] The preparation method of epoxy phenolic modified water-based alkyd resin:
[0038]Add 45 parts by mass of linoleic acid, 5 parts by mass of benzoic acid, 12 parts by mass of maleic anhydride, and 10 parts by mass of pentaerythritol into the reactor, stir and heat up to 160-180°C, react for 3-4 hours, and then Raise the temperature to 240-250°C, react for 5-6 hours; then cool down to 200-220°C, add 5 parts by mass of epoxy phenolic resin, when the acid value of the reactant reaches 7mgKOH / g-15mgKOH / g, cool down to 160 ~170°C; then add 3 parts by mass of trimellitic anhydride and 2 parts by mass of xylene, then raise the temperature to 175~185°C, react for 1~2 hours, when the acid value of the reactant reaches 35mgKOH / g~40mgKOH / g, cool down to 170°C; then add 25 parts by mass of co-solvent ethylene glycol monobutyl ether and keep warm for 20-50 minutes; then cool down to 90°C, add 6 parts by mass of neutralizing agent, and stir evenly to obtain the product.
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