A kind of highly substituted hydroxypropyl guar gum and its preparation method and application
A high substitution technology of hydroxypropyl guar gum, applied in the field of household chemicals, can solve the problems of low substitution degree of hydroxypropyl guar gum, further improvement of solubility and thickening performance, and achieve good solubility And thickening, high molar substitution effect
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Embodiment 1
[0033]162 grams of guar gum powder and 100 grams of 25% sodium hydroxide aqueous solution were added within 10 minutes, and the mixture was stirred for 15 minutes while protecting the nitrogen atmosphere. Then, the mixture was heated to 70°C, while adding a total of 160 g of propylene oxide in multiple times, the addition was completed within 2 hours, and the temperature was maintained at 70°C for 3 hours. The mixture was cooled to room temperature and neutralized to pH 7 by adding glacial acetic acid. The mixture was washed and filtered twice with 1000 ml of 50% acetone aqueous solution, and then washed and filtered with 1000 ml of acetone; the solid was vacuum dried and pulverized to obtain highly substituted hydroxypropyl guar gum.
[0034]The hydroxypropyl molar substitution MS of the highly substituted hydroxypropyl guar prepared by the invention is 1.5. The viscosity of a 1% highly substituted hydroxypropyl guar solution at 25°C is 1900 cp (Brookfield viscometer, 20 revolutions),...
Embodiment 2-12
[0036]The amount of the raw material of the high-substituted hydroxypropyl guar was changed. The specific amount is shown in Table 1. The steps similar to Example 1 were repeated to obtain different MS values. 1% high-substituted hydroxypropyl guar at 25°C The viscosity of the guar gum solution and the light transmittance of the 0.5% highly substituted hydroxypropyl guar gum solution are shown in Table 2.
[0037]Table 1
[0038]
[0039]
[0040]Table 2
[0041]
[0042]The high-substituted hydroxypropyl guar gum prepared in Examples 1-12 was used to prepare a transparent disposable disinfectant gel. The specific formulation of the transparent disposable disinfectant gel is shown in Table 3. For the disinfectant effect in the disinfectant gel formulation, it is recognized that solutions with an ethanol content of more than 60% and chlorhexidine acetate content of more than 0.5% have excellent disinfection effects.
[0043]table 3
[0044] Raw material for transparent disposable disinfection gel Mass pe...
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