Mixing process liquid color

P 52] A double-syringe pump was used for liquid feed [142]. An iodine-starch solution was mixed with a photographic fixer solution in a ratio of 1 3.5. Thereby, the intense blue color changed to pale blue. The mixing process was followed by means of a stereo microscope. 

Another device often used with liquid color is the intermixer (see Fig. 20.3.). An intermixer is installed between the resin hopper and throat of an injection molder or extruder. The main parts of an intermixer are a mixing chamber and a motor-driven impeller. One end of the chamber is usually transparent, so the mixing process is visible. The resin falls into the chamber of the intermixer from the top, and liquid color is pumped into the chamber from the side. The impeller turns at a rate of about 60rpm and distributes the liquid color uniformly on the surfaces of the resin pellets. 

In a stirred reactor, it takes time for liquid added at the surface or at any point in the tank to become blended with the bulk of the liquid. The mixing process can be followed by observing the color change after a basic solution with an indicator is neutralized by suddenly adding a slight excess of acid. If this test is done in a 2-liter vessel, most of the solution will appear free of base in less than a second, but wisps of color may persist for 2-3 seconds until the mixing is complete. If the same test is carried out in a 5000-liter... 

Mixing Liquids. Carriers like mineral oil and plastisol are typical. Mineral oil is used in a variety of liquid color application. Plastisols find use in calendered and slush-molded PVC applications. The process provides good mixing but a low level of dispersion. Some of these blends are suitable for end-use appHcations. Most are milled to provide a higher quality of dispersion. 

C. F. Schonbein also prepared ammonium hypobromite by a process analogous to that employed for the hypochlorite, and obtained a liquid with similar oxidizing properties. The liquid is assumed to contain a mixture of ammonium hypobromite and bromide. C. F. Schonbein likewise inferred the transient formation of ammonium hypoiodite when iodine water and aqueous ammonia are mixed, whereby the liquid is decolorized. The soln. gave a deep blue coloration with starch paste and potassium iodide, etc., and behaved like analogous soln. of the alkali... 

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