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:...