Method for the modification of starch in an aqueous medium
    1.
    发明授权
    Method for the modification of starch in an aqueous medium 失效
    在水性介质中改性淀粉的方法

    公开(公告)号:US4540777A

    公开(公告)日:1985-09-10

    申请号:US591404

    申请日:1984-03-20

    CPC分类号: D21H17/28 C08B31/00

    摘要: The present invention is in the modification of starch by silanes and is performed by bringing the starch into intimate contact with the hydrolyzates of the silanes in the presence of alkali aluminates or alkali hydroxides. Preferably this is done in the aqueous solution of the silane hydrolyzate, in which case the additives can be used either in aqueous solution or in solid form. The aluminate or alkali hydroxide is present at least in such an amount that 0.4 mol of aluminate will be present for each mole of silane. The modification is possible not only with alkyl alkoxysilanes, but also with organofunctional alkoxysilanes. The starch modified with the silanes has better practical properties than corresponding unmodified starch and can be used, for example, for the hydrophobation and oleophobation of cellulosic material.

    摘要翻译: 本发明是通过硅烷改性淀粉,并且通过在碱金属铝酸盐或碱金属氢氧化物的存在下使淀粉与硅烷的水解产物紧密接触来进行。 优选地,这在硅烷水解物的水溶液中进行,在这种情况下,添加剂可以以水溶液或固体形式使用。 铝酸盐或碱金属氢氧化物至少以每摩尔硅烷0.4摩尔铝酸盐的量存在。 不仅可以使用烷基烷氧基硅烷,而且还可以与有机官能团的烷氧基硅烷进行改性。 用硅烷改性的淀粉具有比相应的未改性淀粉更好的实用性能,可用于例如纤维素材料的疏水化和疏水作用。