Water-based resin for metal corrosion protection and with high adhesion and preparation method thereof
A high adhesion, metal anti-corrosion technology, applied in anti-corrosion coatings, coatings, polyurea/polyurethane coatings, etc., can solve the problems of water resistance and poor corrosion resistance, and achieve the effect of improving water resistance
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[0025] The present invention also provides a kind of preparation method that is used for the water-based resin of metal anticorrosion and high adhesion, and this method comprises the following steps:
[0026] (1) Add the epoxy resin in the formulation to a reactor with a reflux device, raise the temperature to 50-100°C, add the polyisocyanate in the formulation, and keep warm at 60-120°C for 1-5h. Preferably, in this step, the heating temperature is 60-100° C., the heat preservation temperature is 70-100° C., and the heat preservation time is 2-4 hours. Addition reaction between isocyanate and epoxy group and hydroxyl group of epoxy resin can obtain multifunctional epoxy resin, which can increase the crosslinking density of epoxy resin after curing, and improve the water resistance and corrosion resistance of the coating after film formation performance.
[0027] (2) After the heat preservation is over, add the polyphenol and part of the solvent in the formula, raise the temp...
Embodiment 1
[0034] (1) Add 500g of E44 epoxy resin to the reactor with reflux device, heat up to 60°C, add 30g of IPDI isocyanate monomer, and keep warm at 90°C for 4h;
[0035] (2) After the heat preservation is over, add 52g ethylene glycol monobutyl ether and 251g tetrabromobisphenol A and bisphenol A mixture, heat up to 110°C, keep warm at 160°C, and measure the epoxy equivalent every 1h, When the difference between the epoxy equivalent values of two consecutive measurements is ≤10, start to cool down;
[0036] (3) Cool down to 110°C, add 160g propylene glycol methyl ether and 150g dehydrated ricinoleic acid, keep warm until the acid value is ≤2mg KOH / g;
[0037] (4) After the acid value is qualified, add 13g of pyrophosphoric acid at 90°C and keep it warm for 2h;
[0038] (5) Cool down to 60°C, add 1180g of deionized water and 25g of N,N-dimethylethanolamine, emulsify and adjust the pH to 8.5, cool and filter to discharge.
Embodiment 2
[0040] (1) Add 400g of E51 epoxy resin to a reactor with a reflux device, heat up to 50°C, add 80g of HDI isocyanate monomer, and keep warm at 80°C for 3h;
[0041] (2) After the heat preservation is over, add 82g ethylene glycol monobutyl ether and 100g hydroquinone, raise the temperature to 120°C, keep the temperature at 170°C, and measure the epoxy equivalent every 2h. When the difference between the equivalent values is less than or equal to 10, start to cool down;
[0042] (3) Cool down to 130°C, add 140g ethylene glycol monobutyl ether and 120g ricinoleic acid, keep warm until the acid value is ≤2mg·KOH / g;
[0043] (4) After the acid value is qualified, add 19g of sulfuric acid at 80°C and keep it warm for 3h;
[0044] (5) Cool down to 70°C, add 1200g of deionized water and 35g of triethanolamine, emulsify and adjust the pH to 8, cool and filter to discharge.
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