Dr. Hans Heubach Gmbh & Co Kg

Goslarer Farbenwerke

Manfred Gawol

Gerhard Adrian

Wigo Haacke

Rainer Henbach

Corrosion inhibiting pigments based on zinc silicate their production

Corrosion-inhibiting pigments, their production and use

Permanently non-dusting pigment and dye preparations, method for

The dust producing properties of a pigment or dye are measured under conditions which close approximate those during handling. A vessel with baffles having pigment or dye therein is rotated for a specified time while air is drawn through the rotating vessel by a specified amount of vacuum applied downstream of the vessel. The baffles disturb the pigment or dye in the vessel, creating dust particles which are entrained in an airstream created by the vacuum. Larger particles trapped in this vacuum are removed by a separator, while the dust particles are trapped in the airstream are trapped by a filter. The dusting properties of the pigment or dye in the vessel may then be determined by weighing the filter.

Aluminum zinc phosphate hydrates or basic aluminum zinc phosphate hydrates are manufactured by reacting 1 mole of aluminum hydrogen phosphate with from 2.4 to 4 moles of zinc oxide, if necessary with the addition of up to 0.4 moles of alkali aluminate or the equivalent quantity of alkali hydroxide. A 50% by weight acidic aluminum hydrogen phosphate solution is preferably used for the reaction which is carried out at an elevated temperature in the range from 30.degree. to 80.degree. C. The aluminum zinc phosphate hydrates produced by the method are useful anti-corrosion pigments for use in paints.

Method for the manufacture of aluminum zinc phosphate hydrates or basic

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Clausthal-Zellerfeld, Germany

Manfred Gawol