One-component waterborne epoxy ester anticorrosive priming paint used for automobile chassis and preparation method of one-component waterborne epoxy ester anticorrosive priming paint
A technology for anti-corrosion primer and automobile chassis, applied in anti-corrosion coatings, coatings, etc., to achieve the effect of low acid value, small particle size of latex particles, and improved water resistance and anti-corrosion performance
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Embodiment 1
[0076] Example 1. Preparation of acrylic resin
[0077] According to the formula shown in Table 1, the unsaturated fatty acid was put into the reaction flask, and the temperature was gradually raised to 140 ° C ~ 145 ° C under stirring, and the monomer mixture was continuously and uniformly added dropwise for 5 to 8 hours. ℃~145℃ for 3 to 4 hours until the conversion rate is over 98%, as evidenced by the solid content. Acrylic resins A1-A4 were obtained. The formulations and acid values of the acrylic resins A1-A4 are listed in Table 1.
[0078] Table 1 Formula and acid value of acrylic resin A1-A4
[0079]
Embodiment 2
[0080] Example 2, preparation of epoxy ester resin
[0081] According to the formula in Table 2, take 40% to 50% by weight of unsaturated fatty acid and 50% to 60% by weight of epoxy resin to carry out esterification at 190 to 200°C to obtain an acid value of 5 to 10 mg KOH / g epoxy ester resin B1-B4.
[0082] Table 2 Formula and acid value of epoxy ester resin B1-B4
[0083]
[0084]
Embodiment 3
[0085] Example 3. Preparation of water-based epoxy ester resin
[0086] According to the formula in Table 3, the acrylic resins A1-A4 prepared in Example 1 were added to the epoxy ester resins B1-B4 prepared in Example 2, respectively, and the esterification reaction was carried out at 190-200 ° C until the final acid The value is 20-50 mg KOH / g, and finally diluted with the cosolvent ethylene glycol butyl ether until the solid weight percentage is 70-75% to obtain the water-based epoxy ester resin.
[0087] Table 3 Formula and acid value of water-based epoxy ester resin
[0088]
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