Epoxy modified saturated polyester resin for undercoat of coil coating and undercoat of coil coating
A coil coating and epoxy modification technology, applied in the direction of anti-corrosion coatings, polyester coatings, coatings, etc., can solve the problems of weak deformation and weather resistance, little performance improvement, and poor miscibility, etc., to achieve comprehensive Effect of performance improvement, strong adhesion and corrosion resistance, good surface hardness and weather resistance
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[0029] Example 1 Preparation of epoxy modified saturated polyester resin
[0030] In parts by weight, the content of each component in the epoxy-modified saturated polyester resin is:
[0031]
[0032] Formula construction process: Put methyl propylene glycol, epoxy resin 609, isophthalic acid, adipic acid, neopentyl glycol and dibutyl tin dilaurate into the reactor according to the proportion, heat up to 130℃, start stirring, React at ℃ for 2 hours, slowly raise the temperature to 180℃, after 1 hour, continue to raise the temperature to 200℃ and continue the esterification reaction until the resin is transparent, lower the temperature to below 180℃, add xylene, and heat to xylene reflux (200℃~220℃ ), reflux reaction to resin acid value ≤5 mgKOH, cool to below 180℃, add S-150# and propylene glycol methyl ether in proportion to dilute, stir well, filter, discharge, and pack.
Example Embodiment
[0033] Example 2 Preparation of epoxy modified saturated polyester resin
[0034] In parts by weight, the content of each component in the epoxy-modified saturated polyester resin is:
[0035]
[0036]
[0037] Formulation construction process: Put methyl propylene glycol, epoxy resin 609, isophthalic acid, adipic acid, neopentyl glycol and dibutyl tin oxide into the reactor in proportion, heat up to 135°C, start stirring, and react at 148°C After 2 hours, slowly raise the temperature to 180°C and maintain for 1 hour, continue to raise the temperature to 205°C and continue the esterification reaction until the resin is transparent, lower the temperature to below 180°C, add xylene, heat up to xylene reflux, reflux reaction until the resin acid value ≤ 5 mgKOH, reduce the temperature to below 180℃, add S-150# and propylene glycol methyl ether in proportion to dilute, stir evenly, filter, discharge, and package.
Example Embodiment
[0038] Example 3 Preparation of epoxy modified saturated polyester resin
[0039] In parts by weight, the content of each component in the epoxy-modified saturated polyester resin is:
[0040]
[0041] Formulation construction process: Put methyl propylene glycol, epoxy resin 609, isophthalic acid, adipic acid, neopentyl glycol and monobutyl tin oxide into the reactor in proportion, heat up to 128°C, start stirring, and react at 145°C For 2.5 hours, slowly increase the temperature to 180°C, and after maintaining for 1 hour, continue to increase the temperature to 205°C and continue the esterification reaction until the resin is transparent. Cool to below 180°C, add xylene, heat up to xylene reflux, and reflux until the resin acid value ≤ 5 mgKOH, cooling below 180℃, add S-150# and propylene glycol methyl ether in proportion to dilute, stir evenly, filter, discharge, and package.
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