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Industrial production method of low PCBs environmentally friendly yellow pigment PY83 for plastic cement

A production method, an environmentally friendly technology, applied in the field of pigments, to achieve the effect of increasing the reaction speed, inhibiting the growth of crystals, and improving the vividness

Active Publication Date: 2019-04-19
CROWN CHEMICAL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The C.I. Pigment Yellow 83 produced by this method has a feed ratio of 100: (104-105) between DCB, AS-IRG and AABI. Although some PCBs can be removed through post-treatment and water washing, the PCBs content in the pigment is still above 25ppm. Data higher than environmental protection requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1) Diazotization reaction: Add 150kg of 3,3′-dichlorobenzidine hydrochloride into the reaction kettle, add 1000kg of water, 250kg of hydrochloric acid, beat at room temperature for 2 hours; Slowly add 274kg of 30% sodium nitrite aqueous solution for 2-3min at T≤0℃, carry out diazotization reaction and stir for 1 hour, remove excess sodium nitrite with sulfamic acid to obtain diazonium solution, add N-methylolpropylene Amide 20kg, filtered after stirring for 20min;

[0025] 2) Coupling reaction: Add 2000kg water, 180kg liquid caustic soda, 18kg SF-1, 5kg AABI, 342kg AS-IRG to the chemical tank, stir at 30-35°C for 30min to obtain a clear liquid; add 5kg formic acid to the reaction kettle , 2000kg of water and 10kgOS-15, after stirring evenly, add 2kg of SF-2 from Huaqing, and stir for 10min; at a temperature of 0-5°C, add the clear liquid in the chemical tank into the reaction kettle within 45-60min, and carry out Acid analysis to obtain a white emulsion; add 300kg sodi...

Embodiment 2

[0028] 1) Diazotization reaction: Add 150kg of 3,3′-dichlorobenzidine hydrochloride into the reaction kettle, add 1000kg of water, 250kg of hydrochloric acid, beat at room temperature for 2 hours; Add 274 kg of 30% sodium nitrite aqueous solution slowly for 2-3 minutes at ≤0°C, carry out diazotization reaction and stir for 1 hour, remove excess sodium nitrite with sulfamic acid to obtain diazonium solution, add N-methylolacrylamide 15kg, filtered after stirring for 20 minutes;

[0029] 2) Coupling reaction: Add 2000kg water, 180kg liquid caustic soda, 18kg SF-1, 5kg AABI, 342kg AS-IRG to the chemical tank, stir at 30-35°C for 30min to obtain a clear liquid; add 5kg formic acid to the reaction kettle , 2000kg of water and 10kg of OS-15, after stirring evenly, add 2kg of SF-2 of Huaqing, and stir for 10min; Analyze to obtain a white emulsion; add 300kg of sodium acetate into the reaction kettle and stir for 10min; use a dilute solution of 50kg of formic acid (85%) and 200kg of ...

Embodiment 3

[0032] 1) Diazotization reaction: Add 150kg of 3,3′-dichlorobenzidine hydrochloride into the reaction kettle, add 1000kg of water, 250kg of hydrochloric acid, beat at room temperature for 2 hours; Slowly add 400kg of 30% sodium nitrite aqueous solution at ≤0°C, carry out diazotization reaction and stir for 1 hour, remove excess sodium nitrite with sulfamic acid to obtain diazonium liquid, add 9kg of N-methylolacrylamide, and stir Filter after 20min;

[0033]2) Coupling reaction: add 2000kg water, 180kg liquid caustic soda, 18kg SF-1, 5kg AABI, 342kg AS-IRG to the chemical tank, stir at 30-35°C for 30min to obtain a clarified liquid; add 5kg to the reaction kettle Formic acid, 2000kg water and 10kgOS-15, stir evenly, add 2kg SF-2 of Huaqing, stir for 10min; at the temperature of 0-5℃, add the clear liquid in the chemical tank into the reaction kettle for 45-60min, and carry out acid analysis , to obtain a white emulsion; add 300kg of sodium acetate to the reactor and stir for ...

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Abstract

The invention discloses an industrial production method of a low PCBs environmentally friendly yellow pigment PY83 for plastic cement. The method includes steps of diazo component pulping treatment, diazotization reaction, preparation of a base solution, coupling liquid preparation, coupling reaction and pigmentation treatment. Based on an existing pigment yellow 83 production method, the method can effectively prevent from generating the side reaction of polychlorinated biphenyl in a coupling reaction process by adding substituted olefin (namely, methylolacrylamide) in the coupling reaction,so that the purpose of removing PCBs can be achieved without influencing pigment performance, the polychlorinated benzidine content in a pigment product can be effectively controlled to be lower thana limit value below 25 ppm of an environmentally friendly requirement, the environment problem of high polychlorinated benzidine content in the pigment product of an existing production method can besolved, the steps of post-treatment and polychlorinated benzidine removing through washing can be decreased, and production costs can be reduced as well. The method is reasonable in technology and suitable for large-scale production.

Description

technical field [0001] The invention belongs to the technical field of pigments, and in particular relates to an industrial production method of low-PCBs environment-friendly yellow pigment PY83 for plastics. Background technique [0002] Low polychlorinated benzidine (PCBs) environment-friendly yellow pigment PY83 (yellow pigment P.Y.83) for plastics, also known as C.I. , similar to Pigment Yellow 10, but twice as strong as Pigment Yellow 10, with excellent light resistance, heat resistance, solvent resistance and migration resistance. Used in printing ink and automotive coatings; widely used in plastic coloring, has good solvent resistance and light resistance, does not migrate and bleed in soft PVC even at low concentrations, and has a light fastness of 8; in HDPE Has high tinting strength. For rubber and plastic, heat resistance 270°C / 5min in PP. [0003] The traditional production method of C.I. Pigment Yellow 83 is: after beating 3,3′-dichlorobenzidine hydrochloride...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09B33/153
CPCC09B33/153
Inventor 杨宗泽张亚
Owner CROWN CHEMICAL CORP
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