Method for preparing stabile aqueous dispersion from synthetic monomers and native starch

A process for preparation of polymeric dispersion based on oxidation of in water dispersed native starch in the presence of hydrogen peroxide in an amount of at least 15 . 10exp(-3) mol per 100 g of starch dry matter and a catalyst of oxidation with concentration more than 1 . 10exp(-3) mol l-1, fol...

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Hauptverfasser: HERENCSAROVA GABRIELA, KELEMEN PETER, KOVACIK JAN
Format: Patent
Sprache:eng ; slo
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Zusammenfassung:A process for preparation of polymeric dispersion based on oxidation of in water dispersed native starch in the presence of hydrogen peroxide in an amount of at least 15 . 10exp(-3) mol per 100 g of starch dry matter and a catalyst of oxidation with concentration more than 1 . 10exp(-3) mol l-1, followed formation of a starch paste without isolation and purification this product and oxidation is continuing adding additional peroxide in an amount of at least 130 . 10exp(-3) mol peroxide per 100 g of starch dry matter. The synthetic monomer is added to reaction mixture during this part of oxidation and stable dispersion is obtained. The dry matter content dispersion is at least 39%, the starch content in the dry at least 24%. Spôsob prípravy polymérnej disperzie spočívajúci v oxidácii natívneho škrobu rozptýleného vo vode v prítomnosti peroxidu v množstve najmenej 15·10-3 mol na 100 g sušiny škrobu a katalyzátora oxidácie s koncentráciou vyššou ako 1·10-3 mol/l, následnom zmazovatení oxidovaného škrobu bez izolácie a čistenia tejto látky a pokračovaní oxidácie pri dodatočnom pridaní peroxidu v množstve najmenej 130·10-3 mol peroxidu na 100 g sušiny škrobu. V priebehu tejto časti oxidácie sa do reakčnej zmesi pridáva syntetický monomér za vzniku stabilnej disperzie. Obsah sušiny disperzie je minimálne 39 %, obsah škrobu v sušine minimálne 24 %.