The invention discloses a preparation method for alginate with ultra-low
viscosity. The preparation method includes the steps that 1,
brown seaweed, as a
raw material, is soaked, fixed, washed, digested, diluted, filtered, floated, and subjected to refined
filtration to obtain colloidal fluid; then through
calcification or acidification, decalcification and
dehydration,
alginic acid is obtained and then smashed; 2, the
alginic acid is degraded through heating, and low-boiling-point substances obtained through
steaming are discharged, and during heating, the
alginic acid is stirred continuously; 3, the degraded alginic acid is cooled,
alcohol is added for uniform stirring, neutralizing is carried out with alkali, and the alginate with ultra-low
viscosity is obtained after
drying and smashing. The problems that in an existing
hydrogen peroxide degrading or
irradiation degrading technology, the stability of product
viscosity is low, the smell of an
oxidizing agent remains, and
irradiation is limited are solved; the application effect of the product is improved, and the alginate is suitable for industrialized production and application.