High-molecular weight sodium polyacrylate and preparation method thereof

Abstract

The invention discloses high-molecular weight sodium polyacrylate and a preparation method thereof, and belongs to the field of food additives. Specifically, high-molecular weight sodium polyacrylate is prepared through the following steps: adding refined acrylic acid, deionized water, a sodium hydroxide solution, an ether chain extender and a persulphate initiator to a reaction kettle in a certain ratio and a certain order, stirring evenly and then transferring the mixture to a polymerization tank, and putting the polymerization tank in a constant-temperature water bath for certain time to obtain high-molecular weight sodium polyacrylate. High-molecular weight sodium polyacrylate has the beneficial effects that the problems of low molecular weight of synthesized sodium polyacrylate, complex equipment and many undissolved substances are solved through raw material refining; as a result, the food additive sodium polyacrylate which is high in molecular weight, high in viscosity, green and safe is obtained; sodium polyacrylate has improvement effect in flour products.

Description

technical field [0001] The invention relates to a high-molecular-weight sodium polyacrylate and a preparation method thereof, belonging to the technical field of food additives. Background technique [0002] Food additive sodium polyacrylate is a water-soluble polymer compound with a strong thickening and water-retaining function. The product has high purity, extremely stable performance, odorless and tasteless, and can be stored for a long time without corruption. It can be widely used in pasta, processed food and frozen food, but its molecular weight determines its use effect. Only sodium polyacrylate with high molecular weight and high viscosity can have good thickening, reinforcing and water retention effects. [0003] During the storage of acrylic acid, in order to prevent its self-polymerization, a certain amount of polymerization inhibitors (phenolic compounds, copper salts, nitrous acid compounds) must be added to it. These polymerization inhibitors not only hinder ...

AI Technical Summary

Problems solved by technology

[0003] During the storage of acrylic acid, in order to prevent its self-polymerization, a certain amount of polymerization inhibitors (phenolic compounds, copper salts, nitrous acid compounds) must be added to it. These polymerization inhibitors not only hinder the reaction, but are also toxic and harmful substances. , so that the product cannot be used in food, so it must be removed by scientific and effective methods. The existing methods for purifying acrylic acid mostly use activated carbon adsorption, but this method cannot completely remove the polymerization inhibitor

In addition, in the existing production process of food-grade sodium polyacrylate, the equipment is complicated, the molecular weight of the product is small, and the insoluble matter is more