Method for preparing P.Y.97 permanent yellow pigment

A permanent yellow and pigment technology, applied in chemical instruments and methods, azo dyes, organic dyes, etc., can solve the problems of low yield and color difference of permanent yellow pigments, and achieve the effect of bright colors and high tinting strength

Active Publication Date: 2013-06-12
浙江胜达祥伟化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention provides a preparation method of P.Y.97 permanent yellow pigment, which mainly solves the problem that the preparation method existing in the prior art cannot be used to directly prepare P.Y.97 permanent yellow pigment, and the P.Y.97 permanent yellow pigment currently produced is The yellow pigment has poor shade and low yield and other technical problems

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: the preparation method of a kind of P.Y.97 permanent yellow pigment of this example, its steps are:

[0021] a. Add water V=0.3T in the diazo tank, add 25 parts by weight of the first liquid alkali with a concentration of 30% and raise the temperature to 70°C, then add 48 parts by weight of 4-amino-2,5-dimethoxy-N- Benzenesulfonylanilide, cool down after being dissolved, add hydrochloric acid with a concentration of 31% for beating, adjust the temperature t≤3°C, V=0.8T, add hydrochloric acid and stir for 8 minutes, the total amount of hydrochloric acid added is 65 parts by weight, 2 minutes Quickly add 10 parts by weight of sodium, stir for 50 minutes and adjust the temperature t≤5°C, until it shows a slight blue color after testing with KI test paper, adjust the temperature t≤5°C after filtration, V=1.05, and wait for coupling;

[0022] b. Add water V=0.45T in the dissolution tank, add 30 parts by weight of the second liquid caustic soda with a concentr...

Embodiment 2

[0027] Embodiment 2: the preparation method of a kind of P.Y.97 permanent yellow pigment of this example, its steps are:

[0028] a. Add water V=0.32T in the diazo tank, add 28 parts by weight of the first liquid caustic soda with a concentration of 30% and raise the temperature to 72°C, then add 50 parts by weight of 4-amino-2,5-dimethoxy-N- Benzenesulfonylanilide, cool down after being dissolved, add hydrochloric acid with a concentration of 31% for beating, adjust the temperature t≤3°C, V=0.82T, add hydrochloric acid and stir for 10 minutes, the total amount of hydrochloric acid added is 70 parts by weight, 4 minutes Quickly add 11 parts by weight of sodium, stir for 60 minutes and adjust the temperature t≤5°C until it shows a slight blue color after testing with KI test paper. After filtering, adjust the temperature t≤5°C, V=1.08, and wait for coupling;

[0029] b. Add water V=0.47T in the dissolving tank, add 31 parts by weight of the second liquid caustic soda with a c...

Embodiment 3

[0034] Embodiment 3: the preparation method of a kind of P.Y.97 permanent yellow pigment of this example, its steps are:

[0035] a. Add water V=0.35T in the diazo tank, add 30 parts by weight of the first liquid alkali with a concentration of 30% and raise the temperature to 72°C, then add 52 parts by weight of 4-amino-2,5-dimethoxy-N- Benzenesulfonanilide, cool down after dissolving, add hydrochloric acid with a concentration of 31% for beating, adjust the temperature t≤3°C, V=85T, add hydrochloric acid and stir for 12 minutes, the total amount of hydrochloric acid added is 75 parts by weight, within 5 minutes Quickly add 12 parts by weight of NaNa, stir for 70 minutes and adjust the temperature t≤5°C until it shows a slight blue color after testing with KI test paper. After filtering, adjust the temperature t≤5°C, V=1.1, and wait for coupling;

[0036] b. Add water V=0.5T in the dissolving tank, add 32 parts by weight of the second liquid caustic soda with a concentration...

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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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09B29/33C09B67/20C09B67/36
Inventor 唐乃春王国峰冯加民
Owner 浙江胜达祥伟化工有限公司
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