Autocatalytic alkyd resin and preparation method thereof

Abstract

The invention discloses an autocatalytic alkyd resin and a preparation method thereof. The preparation method comprises the following steps: putting glycerol, benzoic acid, soya-bean oil acid, phthalic anhydride, a color reducer, xylene and a self-made drier into a four-necked flask; conducting heating to a reflux state by using a heating jacket, conducting reacting at 180-200 DEG C for 3 hours, separating out water, then conducting heating to 200-210 DEG C, conducting reacting for 5 hours, conducting cooling to 100 DEG C when the acid value is 10-20 mgKOH/g, adding xylene, and conducting stirring to obtain the self-catalytic alkyd resin. According to the alkyd resin, a group with a drying effect is introduced, self-catalysis is realized, the drying time of PU paint can be shortened without adding a drier when the paint is prepared, compared with an additional drier, the catalytic effect is more stable, the problem that the glossiness of a paint film is not uniform due to non-uniform precipitation and dispersion of an additional drier is avoided, the polishing property and yellowing resistance of the primer are improved, and the later paint preparation cost of a client is reduced.

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 for 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 the wood with high oil content of teak can be used. PU paint is generally divided into: high-gloss paint, bright paint, semi-sub-paint and matt paint. [0003] The existing glycerin system or a small amount of pentaerythritol and a large amount of ethylene glycol (diethylene glycol) alkyd system, made into PU primer in areas with low temperature, has the disadvantages of slow drying speed and poor sandability. When making PU primer or matt finish, we usually add organotin or organic amine as the drier o...

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