Method for preparing rosin derivative for pigment industry

Abstract

The invention discloses a method for preparing a rosin derivative for the pigment industry and relates to the technical field of deep processing of rosin. The method comprises the following steps of: adding alkylphenol disulfide which accounts for 0.1-1.0% of the total mass of rosin into the rosin and carrying out disproportionation reaction, wherein the reaction temperature is 260-280 DEG C and the reaction time is 2-6 hours; cooling down after the reaction is accomplished; adding tannic acid which accounts for 0.3-1.0% of the total mass of the rosin at 160-200 DEG C; stirring and reacting for 1-3 hours; and taking out the product which is the rosin derivative. Compared with the prior art, the rosin derivative can improve the tinting strength of the pigment, is high in transparency and is nature and environment-friendly. The rosin derivative is mainly applied to industries such as pigment synthesis and is particularly applicable to preparation of benzidine yellow pigment with high additive amount.

Description

technical field [0001] The invention relates to the technical field of rosin deep processing, in particular to a method for preparing rosin derivatives used in the pigment industry. Background technique [0002] Conventional offset ink benzidine yellow pigments need to add a large amount of disproportionated rosin or hydrogenated rosin to obtain pigments with high transparency, high tinting strength and low cost. The disproportionated rosin and hydrogenated rosin on the market are basically produced by the catalytic reaction of noble metal palladium on carbon. There will inevitably be a certain amount of catalyst residue in the product. The rosin derivatives catalyzed by this noble metal have great safety hazards and are easy to catch fire during production and transportation. There have been many serious fires caused by the use of this type of rosin in the pigment industry at home and abroad, and the losses have been heavy. In some improved methods, some people use a larg...

AI Technical Summary

Problems solved by technology

There will inevitably be a certain amount of catalyst residue in the product. The rosin derivatives catalyzed by this noble metal have great safety hazards and are easy to catch fire during production and transportation.

There have been many serious fires caused by the use of this type of rosin in the pigment industry at home and abroad, with heavy losses

In some improved methods, some people use a large amount of antioxidants to solve the above safety problems, but unfortunately this method cannot completely solve the problem, and sacrifices the color development performance of the pigment and affects the drying performance of the ink.