Alkyd resin and preparation
A technology of alkyd resin and fatty acid, applied in the field of improved alkyd resin and preparation, can solve the problems of difficult varnish and light-color solid-color paint, opaque appearance, long production cycle, etc., and achieves complete reaction, good transparency, Fast-drying effect of paint film
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Embodiment 1
[0018] Example 1: Put 48wt% soybean oil acid, 17wt% glycerin, 25wt% crude terephthalic acid, plus 0.09wt% butyl tin catalyst into a stainless steel reactor, seal the feeding port, open the vent valve, heat up and stir . A large amount of water appears when the temperature is raised to 120°C (pay attention to the pot). Keep the temperature at 235-240°C for 3 hours. After sampling, the temperature is lowered to 200°C. After the material is transparent, 2wt% of phthalic anhydride, 6wt% of rosin and 2wt% of rosin are added. Benzoic acid and an appropriate amount of reflux solvent, heat up to 240-245°C and keep it warm until the centrally controlled acid value is below 14 and the Grignard viscosity is 8-11 seconds. The entire production process takes about 22-24 hours. Finally, the temperature was lowered to below 160°C and 200# solvent was added to adjust the viscosity, and filtered by pressure.
Embodiment 2
[0019] Example 2: Put 8wt% of linoleic acid, 48wt% of soybean oleic acid, 12wt% of pentaerythritol, 14wt% of crude terephthalic acid, plus 0.09wt% of butyl tin catalyst into a stainless steel reactor. The subsequent feeding ratio is 4wt% phthalic anhydride, 10wt% rosin, 4wt% benzoic acid. The method steps are the same as in Example 1. All indexes of the obtained alkyd resin are the same except that the color is darker than that of Example 1. As the replacement amount is reduced and linoleic acid is added, the cost is higher than that of Example 1.
Embodiment 3
[0020] Example 3: The feed ratio is 10wt% linoleic acid, 44wt% soybean oil acid, 17wt% glycerin, 16wt% crude terephthalic acid, plus 0.09wt% butyl tin catalyst, 2wt% phthalic anhydride, 10wt% rosin, 1.0wt% Of benzoic acid. The preparation method is the same as before.
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