Preparing method for yellow paint

Abstract

The invention discloses a preparing method for yellow paint, comprising the following steps: 1. putting water, hydrochloric acid, 3,3`- dichlorobiphenylamine hydrochloride and solid sodium nitrite into diazonium barrel for carrying out diazotization reaction; 2. adding water, liquid alkali, N-acetacetoanilide and PMP into solution barrel for carry out coupling; 3. adding 300 parts of water into additive chemical barrel, heating up to 70oC, adding 25kg of quaternary ammonium salt, melting to bright transparency; 4. boiling after adding water and sodium hydroxide into rosin barrel, adding disproportinated rosin, adding hyperdispersant; 5. adding water and natrium aceticum into coupling barrel, adding diluted hydrochloric acid and adjusting the pH to 6.0-6.5, diazotization coupling at 40-45oC, adding the fluid in step 3, using sodium hydroxide solution to adjust the pH=10.0-10.5 for more than 10 minutes, keeping warm, cooling, filter pressing, rinsing,drying and getting the finished goods with bright color, high transparency, strong coloring power, low oil absorbing quantity and high gloss.

Description

technical field [0001] The invention belongs to the technical field of pigment production and processing, in particular to a preparation method of a yellow pigment. Background technique [0002] Pigments are powdered substances used for coloring. It is insoluble in water, oil, resin, organic solvent and other media, but can be evenly dispersed in these media and can color the media, so it has a certain covering power. [0003] Pigment yellow 12, its hue is almost a positive yellow, just suitable for yellow among the basic three primary colors of pigments, and the price is low, so it consumes the most among all yellow pigment varieties. It is used in rubber printing, low-grade solvent ink, water-based and low-grade plastic, especially in offset printing ink, which is almost dominant in the world. In the four-color offset printing ink, yellow is overprinted as the last layer. In order not to cover other colors, the yellow pigment is required to be highly transparent, and als...

AI Technical Summary

Problems solved by technology

In the four-color offset printing ink, yellow is overprinted as the last layer. In order not to cover other colors, the yellow pigment is required to be highly transparent, and also requires high color strength, low oil absorption and high brightness. Pigment Yellow 12 for color set offset printing has the following problems: relying on a large amount of rosin to improve transparency, but not bright, and high oil absorption, low tinting strength, it is difficult to meet the requirements of high-end offset printing inks

The pigment yellow 12 made in this way is not bright, not high in transparency, low in color strength and large in oil absorption

Cannot meet the requirements of high-end offset printing