Stabilized red phosphorus material and a process for its preparation
AssigneeClariant GmbH
InventorsSebastian Hörold, Jürgen Laubner
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Abstract
The invention relates to a stabilized, pulverulent red phosphorus material composed of phosphorus particles whose particle size is not more than 2 mm, and whose surface has been covered with a thin layer of an oxidation stabilizer, wherein the oxidation stabilizer is silver, and also to the use of the same, and to a process for its preparation.
Claims23
A stabilized, pulverulent red phosphorus material comprising phosphorus particles whose particle size is not more than 2 mm and whose surface has been covered with a thin layer of an oxidation stabilizer, wherein the oxidation stabilizer is silver, and an additional stabilizer, wherein the additional stabilizer is a metal hydroxide.
A stabilized, pulverulent red phosphorus material comprising from 76 to 99.2% by weight of red phosphorus,
- from 0.05 to 2% by weight of silver,
- from 0.5 to 10% by weight of metal hydroxide,
- from 0.2 to 10% by weight of synthetic thermoset resin, and
- from 0.05 to 2% by weight of phlegmatizer.
A process for preparing a stabilized, pulverulent red phosphorus material comprising the steps of, in succession,
- a) stirring a water-soluble silver compound into an aqueous suspension of the (untreated) red phosphorus and adjusting the pH to 7;
- b) stirring a water-soluble metal compound into this suspension and adjusting the pH to a value of from 4 to 9, and continuing to stir at from 40 to 80° C. for from 0.5 to 3 hours;
- c) then adding an aqueous emulsion comprising an epoxy resin and comprising an epoxy resin hardener and continuing to stir at from 40 to 80° C. for from 0.5 to 3 hours;
- d) adding an aqueous emulsion of the water-emulsifiable organic compound serving as phlegmatizer and adjusting the pH to a value of from 5 to 9, and continuing to stir at from 20 to 90° C. for from 0.5 to 3 hours and
- e) then filtering the product and drying the same at temperatures from 80 to 150° C.
Dependencies are inferred from the claim text.