Cation guar gum with transparent gum liquid and preparation method thereof

Abstract

The invention discloses cation guar gum and a preparation method thereof, wherein the cation guar gum is prepared by the method comprising the following steps of: 1. putting 26-32 parts by weight of solid base into 150-360 parts by weight of dispersion medium to prepare a high-concentration lye, and then adding 100 parts by weight of guar gum into the lye for fully swelling; 2. dropwise adding 140-200 parts by weight of cation etherifying agent, reacting for 2-5 hours at the temperature of 40-80 DEG C, then neutralizing a pH to 7-8 through an acid, washing, centrifugalizing and drying. The cation guar gum solution has higher transparency, and the light transmittance of a 1-percent guar gum derivative solution is measured by a spectrophotometer to be higher than 85 percent; the viscosity is 100-800mPa.s; and the substitution degree of cations is high and can be 0.7-1.0. The cation guar gum of the invention has suitable viscosity and stable gum liquid and is very suitable for the field of transparent personal-care supplies.

Description

technical field [0001] The invention relates to a modified polysaccharide product and a preparation method thereof, in particular to a cationic guar gum and a preparation method thereof. Background technique [0002] Guar gum, known as "guargum" in English, also known as guar gum, guar gum, etc., is a highly purified natural polysaccharide extracted from guar beans, a leguminous plant widely planted in the Indian-Pakistan subcontinent. Guar gum polysaccharide is a natural galactomannan, the main chain of its chemical structure is (1,4)-β-D mannose as a unit, and the side chain is composed of α-D galactose and (1,6 ) bonds are connected to the main chain. There is a galactose branch every other mannose, and the ratio of the two is about 2:1. Polysaccharides can be dispersed in water to form high-viscosity liquids. Generally, the viscosity of a 1% aqueous solution of polysaccharide raw powder is 4000-6000 mPa·s. Natural guar polysaccharides have the following disadvantages:...

AI Technical Summary

Problems solved by technology

Natural guar polysaccharides have the following disadvantages: high content of water-insoluble matter; cannot quickly swell and hydrate, and dissolve slowly; viscosity is not easy to control; resistance to electrolytes and microbial degradation is poor. After that, the above shortcomings can be significantly improved

Its shortcoming is that modified guar gum polysaccharide aqueous solution concentration is low, and its preparation method is difficult to industrialization and mass production, and cost is higher

Application facts show that cationic guar gums with different degrees of substitution and different viscosities are used in different fields. U.S. USP3326890, USP3350186, USP 3483121, etc. disclose the preparation process of cationic guar gums, but these technologies have complicated synthesis steps and the degree of substitution of products Low defects, especially not applicable to transparent daily chemical products