Amphoteric guar gum, preparation method and application thereof

Abstract

The invention discloses amphoteric guar gum, a preparation method and application thereof. The preparation method comprises the following steps: (A) adding guar gum raw powder into a low-polar or non-polar solvent at normal temperature, and adding a basic catalyst aqueous solution into the solvent for soaking and basifying; (B) adding a cationic etherifying agent into the mixture under the pressure of between 0.05 and 0.3 Mpa; and (C) adding an anionic etherifying agent into the mixture to react, and adding a neutralizing agent to neutralize the mixture until pH is between 7 and 8, and collecting the amphoteric guar gum from reactant. The prepared product has excellent viscosity stability and higher transparency. As a thickening agent, the amphoteric guar gum can be applied to paper making, foods, textile and other fields; and as a reinforcing agent, the amphoteric guar gum can be applied to the field of paper making, and can obviously improve the baked strength of paper without reducing the softness of the paper.

Description

technical field

[0001] The invention relates to a preparation method of amphoteric guar gum. technical background

[0002] Guar gum is a kind of leguminous plant, which is a natural galactomannan, which mainly grows in the arid regions of India and Pakistan. The main chain of its chemical structure is (1,4)-β-D mannose as the unit, and the side The chain is composed of α-D galactose and connected to the main chain by (1,6) bonds. Galactose is randomly distributed on the main chain, and this basically linear but branched structure determines that the properties of guar gum are significantly different from those of unbranched, water-insoluble glucomannan. It has a similar molecular structure to cellulose, which determines that it has a natural affinity with cellulose.

[0003] Guar collagen powder can only be dissolved in aqueous solution, but the defects such as slow dissolution of the original powder in aqueous solution and high content of water-insoluble substances limit ...