A kind of self-catalyzed alkyd resin and preparation method thereof

Abstract

The invention discloses a self-catalyzed alkyd resin and a preparation method thereof. During the preparation, glycerin, benzoic acid, soy oil acid, phthalic anhydride, color reducing agent, xylene and self-made drier are put into a four-necked flask, and the Raise the temperature to reflux, react at 180-200°C for 3 hours, then divide the water and raise the temperature to 200-210°C, react for 5 hours, when the acid value is 10-20mgKOH / g, cool down to 100°C, add xylene and stir to obtain autocatalytic Alkyd resin. The alkyd resin achieves self-catalysis by introducing a group with drying effect, and can shorten the drying time of PU paint without adding a drier when making paint. Compared with an external drier, the catalytic effect It is more stable, and there is no problem of uneven gloss of the paint film caused by uneven precipitation and dispersion of the external drier, which improves the sandability and yellowing resistance of the primer, and reduces the cost of the customer's later paint production.

Description

technical field [0001] The invention relates to the technical field of resin preparation, in particular to a self-catalyzed alkyd resin and a preparation method thereof. Background technique [0002] PU paint is the collective name of all polyurethane coatings. Its film-forming method is natural film-forming, with good hardness, good fullness, good adhesion, good durability, and good hand feeling. The paint film is thin and not very hard; but its adhesion is particularly good, and any wood with such a high oil content as teak will do. PU paint is generally divided into: high-gloss paint, gloss paint, semi-mat paint, matt paint. [0003] The existing glycerin system or a small amount of pentaerythritol and a large amount of ethylene glycol (diethylene glycol) alkyd system can be used as a PU primer in areas with low temperature, which has the disadvantages of slow drying speed and poor sandability. When making PU primers or matte topcoats, we usually add organic tin or orga...

AI Technical Summary

Problems solved by technology

[0003] The existing glycerin system or a small amount of pentaerythritol and a large amount of ethylene glycol (diethylene glycol) alkyd system can be used as a PU primer in areas with low temperature, which has the disadvantages of slow drying speed and poor sandability

When making PU primers or matte topcoats, we usually add organotin or organic amines as the drier of the system to accelerate the reaction of -OH in the resin with -NCO groups in the curing agent and shorten the life of the paint film. Drying time; but if the external drier is not stirred evenly, it is easy to cause the gloss of the paint film to be different, and it is easy to affect the transparency of the paint film