Coated sodium percarbonate particles, method of producing...

Details Coated sodium percarbonate particles, method of producing... Coated sodium percarbonate particles, method of producing...

C - Chemistry, Metallurgy

01

B

C01B 15/00 (2006.01) C01B 15/10 (2006.01) C11D 3/39 (2006.01) C11D 17/00 (2006.01) D06L 3/00 (2006.01)

Patent

CA 2166281

In the prior art, sodium percarbonate is coated with compounds which produce a stabilizing action in order to increase the shelf life. There is a need for an improved, boron-free, coating for sodium percarbonate. Proposed by the invention is a particle coating containing sodium carbonate plus one or more optionally partly hydrated magnesium compounds, preferably magnesium sulphate, in a single coat or in separate coats. The coating preferably contains two coats. The particles are produced by spraying aqueous solutions containing the coating compounds on to sodium percarbonate in a fluidized bed and at the same time evaporating off the water. Their long shelf life makes particles coated in this way suitable for use in washing, bleaching and cleaning agents.

Jusqu'à maintenant, on enrobait le percarbonate de sodium avec des composants à effet stablisant, en vue d'accroître sa stabilité au stockage. L'invention vise à obtenir du percarbonate de sodium enrobé amélioré, exempt de bore. Conformément à l'invention, des particules enrobées de percarbonate de sodium renferment dans leur enrobage, du carbonate de sodium et un ou plusieurs composés de magnésium, de préférence du sulfate de magnésium, sous une forme éventuellement partiellement hydratée, en une seule couche ou en couches distinctes. De préférence, les particules enrobées de percarbonate comprennent deux couches. La fabrication des particules selon l'invention s'effectue par pulvérisation de solutions aqueuses renfermant les composants de l'enrobage sur du percarbonate de sodium en lit fluidisé, avec vaporisation simultanée d'eau. Grâce à leur haute stabilité au stockage, les particules conformes à l'invention conviennent pour l'emploi dans des agents de lavage, de blanchiment et de nettoyage.

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