Method for preparing P.Y.97 permanent yellow pigment

Abstract

The invention relates to a method for preparing a pigment, in particular to a method for preparing a P.Y.97 permanent yellow pigment, and mainly solves the technical problems that the preparation method in the prior art cannot be used for directly preparing the P.Y.97 permanent yellow pigment and currently, the produced P.Y.97 permanent yellow pigment has poor chromatic light, low yield and the like. The method comprises the following steps of: carrying out diazotization on 4-amino-2,5-dimethoxy-N-benzenesulfonyl amine; coupling 4-amino-2,5-dimethoxy-N-benzenesulfonyl amine with 4-chlorine-2,5-dimethoxy-N-acetoacetanilide; then carrying out post treatment, pressure filtration, drying and grinding on the materials; and finally packaging to obtain the finished product.

Description

technical field

[0001] The invention relates to a preparation method of a pigment, in particular to a preparation method of a P.Y.97 permanent yellow pigment. Background technique

[0002] With the improvement of people's living needs, pigments are required in many places such as lithographic inks and colored plastics. In order to meet the requirements of high resolution, pigments with regular shape and good fluidity are required. At present, the production of pigments is generally prepared by processes such as mixing, kneading, pulverizing, grading, and adding additives. The Chinese patent discloses a preparation method of Pigment Yellow (publication number: CN 101381527A). The first step of the preparation method is the diazotization of 3,3'-dichlorobenzidine, and the second diazotization is added during the diazotization Nitrogen component: 3,3'-dimethylbenzidine, add 30% hydrochloric acid, 3,3'-dichlorobenzidine and 3,3'-dimethylbenzidine in water, stir to dissolve for ...