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Continuous process for preparing pigment flush

A pigment and fluidization technology, which is applied in the preparation of ink base materials and ink composition products, and in the field of preparation of ink composition logistics, can solve the problems of damage to pigment dispersion, inappropriate pinch method, etc., and achieve other performance improvement effects

Inactive Publication Date: 2005-07-20
SUN CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Thus the pinch method is not suitable due to the additional reason that squeezing the pigment would cause an undesired agglomeration of the pigment particles which in turn would impair the pigment dispersion

Method used

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  • Continuous process for preparing pigment flush

Examples

Experimental program
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Effect test

Embodiment

[0031] A filter cake dispersion is formed by stirring a mixture of pigment and filter cake. This produces a fluid, well dispersed filter cake. Choose from alkyd resins, typical rinse media, and solvents to produce rinse media.

[0032] The twin-screw extruder had the following configuration: 40 mm diameter, 58 length / diameter ratio. The extruder had a total of 14 barrel sections arranged as follows: the color was added at the beginning of the first barrel, and the flushing medium was in the third barrel. Drain water at bucket 7 and add wash water at three points in buckets 9 and 10. Vacuum is applied at barrel 13 and barrel 14 has a position for adding the mixture of solvent and resin to obtain the finished mixture.

[0033] On the above equipment, the feed rate was estimated in pounds of pigment per hour (lbs / hr). In each example, the feed rate of one of the following pigments was set at 30-35 lbs / hr: Pigment Red 57:1, Pigment Yellow 12, Pigment Blue 15:3. A flushing veh...

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PUM

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Abstract

The present invention provides a process for continuous production of pigment flushes and an apparatus for carrying out the process. In the process of the invention, the pigment press cake is first fluidized. The fluidized press cake and a hydrophobic liquid organic medium are fed into a twin screw extruder. The kneading of the organic medium and press cake between the twin screws flushes the pigment into the organic medium. The water phase and flushed pigment phase are separated by removing at least part of the water phase through a vent in the extruder. An impediment to the flow of material downstream of the water vent causes the flush to accumulate in the vented section for a period of time sufficient to remove the desired amount of the water phase. The flush works over the impediment and passes downstream to where vacuum is applied to remove residual water from the flush. The flush may be further combined with other ink ingredients to form an ink product.

Description

technical field [0001] The present invention relates to a method of making a flow of pigment, and more particularly to a method of making a flow of an ink composition. The invention also relates to methods of making ink bases and finished ink compositions. Background technique [0002] The synthesis of many organic pigments includes a coupling step in a dilute aqueous medium to produce a pigment product slurry, after which the pigment is concentrated, typically by filtering the slurry in a filter press. The resulting filter cake is then dried to provide dry particulate pigment, or "washed" with an organic medium such as oil and / or resin to transfer the pigment particles from the aqueous filter cake to the oil or resin phase. Flushing helps keep the pigment particles from agglomerating, making them easy to use for inks or paints. The flushing method requires additional time and materials compared to simply drying the paint. However, if the pigment is to be used in an ink o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09B67/00C09D11/02
CPCC09D11/037C09B67/0021C09B67/006
Inventor 乔治·罗伯特森
Owner SUN CHEM CORP