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A kind of industrialized production method of red pigment with less machine surface precipitation and its machine surface precipitation detection method

A production method and technology for pigments, applied in chemical instruments and methods, organic dyes, color/spectral property measurement, etc., can solve problems such as difficulty in cleaning the machine surface, serious precipitation of pigments on the machine surface, and loss of pigment coloring. Low requirements, short reaction time, improved dispersibility

Active Publication Date: 2016-04-06
CROWN CHEMICAL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Traditional pigment production and testing did not pay attention to the performance of pigment precipitation on the machine surface. The pigment precipitation on the machine surface is serious, resulting in the loss of pigment coloring and increasing the difficulty of cleaning the machine surface.
Bring great troubles to downstream enterprises

Method used

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  • A kind of industrialized production method of red pigment with less machine surface precipitation and its machine surface precipitation detection method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1) Put 175Kg of 2-chloro-4-aminotoluene-5-sodium sulfonate into a common reaction kettle, add 2000Kg of water, raise the temperature to 70°C until completely dissolved, quickly add 215Kg of hydrochloric acid with a content of 30%, and then incubate at 0°C for 10 Add 251Kg of 20% sodium nitrite solution in 1 minute and carry out diazotization stirring reaction for 1 hour;

[0030] 2) Inject 145Kg of 3-hydroxy-2-naphthoic acid into the coupling reactor, add 250Kg of liquid caustic soda with a content of 30%, stir until the 3-hydroxy-2-naphthoic acid is dissolved, and add 35kg of rosin;

[0031] 3) Add the diazo solution into the coupling reaction kettle at 15°C for coupling reaction, and stir for 2 hours after adding the diazo solution;

[0032] 4) Raise the temperature to 38°C, inject 280Kg of calcium chloride into the coupling reaction kettle, stir for 1 hour and 15 minutes, then raise the temperature to 95°C for post-treatment, keep the heat for 30 minutes, cool down a...

Embodiment 2

[0035] 1) Put 175Kg of 2-chloro-4-aminotoluene-5-sulfonic acid into a common reaction kettle, add 2000Kg of water; quickly add 215Kg of 30% hydrochloric acid, and then add 20% sodium nitrite solution within 20 minutes at 10°C 251Kg carried out diazotization stirring reaction for 2 hours;

[0036] 2) Inject 148Kg of 3-hydroxy-2-naphthoic acid into the coupling reaction kettle, add 255Kg of liquid caustic soda with a content of 30%, and stir until the 3-hydroxy-2-naphthoic acid is dissolved;

[0037] 3) Add the diazo solution into the coupling reaction kettle at 10°C for coupling reaction, stir for 2 hours after adding the diazo solution, and add 17.5kg of S-rosin;

[0038] 4) Raise the temperature to 35°C, inject 350Kg of calcium chloride into the coupling reaction kettle, stir for 30 minutes, heat up to 95°C for post-treatment, keep warm for 10 minutes, cool down and filter, and dry at 90°C to obtain a pigment red weight of 351kg. The application performance of the pigment re...

Embodiment 3

[0040] 1) Put 175Kg of 2-chloro-4-aminotoluene-5-sulfonic acid into a common reaction kettle, add 2000Kg of water; quickly add 215Kg of 30% hydrochloric acid, and then add 20% sodium nitrite within 15 minutes at -2°C Solution 251Kg carried out diazotization stirring reaction for 1 hour;

[0041] 2) Inject 145Kg of 3-hydroxy-2-naphthoic acid into the coupling reaction kettle, add 250Kg of liquid caustic soda with a content of 30%, stir until the 3-hydroxy-2-naphthoic acid is dissolved, and add 30kg of stearic acid;

[0042] 3) Add the diazo solution into the coupling reaction kettle at 15°C for coupling reaction, and stir for 1.5 hours after adding the diazo solution;

[0043] 4) Raise the temperature to 40°C, inject 320Kg of calcium chloride into the coupling reaction kettle, stir for 15 minutes, heat up to 85°C for post-treatment, keep warm for 20 minutes, cool down and filter, and dry at 90°C to obtain Pigment Red with a weight of 359kg. The application performance of the p...

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Abstract

An industrial production method for a red with small precipitation on a machine surface and a method for detecting precipitation on a machine surface and belong to the technical field of pigment synthesis and detection. Amino chlorotoluene sulfonic acid sodium salt is subjected to acidification to obtain a turbid liquid; a sodium nitrite water solution is added to achieve diazotization so as to obtain a diazotized solution; the diazotized solution and 3-Hydroxy-2-naphthoic acid are subjected to coupled reaction with existence of a dispersant, and the obtained product is laked to obtain a red. Before laking, the dispersant is added to coat the pigment so as to obstruct growth of the pigment crystal form, the dispersity is improved, the applicability of the machine surface precipitation during application of the blue-ray red to plastics is remarkably improved, and the economic benefits are improved; the reaction conditions are mild, the requirements on equipment are low, and the reaction time is short; the dispersant is relatively common, the application difficulty of a modifier is relatively low, the performance of the obtained blue-ray red is good, the heat resistance can reach 220-230 DEG C, and the transference resistance is of 4 grade.

Description

technical field [0001] The invention belongs to the technical field of pigment synthesis and detection, and in particular relates to an industrialized production method of a red pigment with less machine surface precipitation and a machine surface precipitation detection method with convenient operation and simple synthesis process. Background technique [0002] Compared with C.I. Pigment Red 48:3 and 48:4, the pigment shows yellow light, and is mainly used in plastics and PU resins, but it is bluer than Pigment Red 57:1. It is widely used in the coloring of PVC and PU. It is more light-resistant than P.R.48:1, heat-resistant to 220°C / 5min in PP, and can also be used in the coloring of PP puree. [0003] Machine surface precipitation refers to a phenomenon that pigment precipitation remains on the surface of the mixing machine when the pigment is mixed with the medium for coloring. [0004] In traditional pigment production and testing, the performance of pigment precipitat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09B29/15C09B67/08G01N21/29
Inventor 杨宗泽周华
Owner CROWN CHEMICAL CORP
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