Preservative, preparation method thereof and cosmetic
A technology of preservatives and solvents, applied in the field of chemical material modification, can solve problems such as human skin damage
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[0036] Preparation of preservatives
[0037] An embodiment of the second aspect of the present application provides a method for preparing a preservative, comprising the steps of:
[0038] (1) anisic acid and weak base are mixed and reacted in water to obtain anisic acid weak acid and weak base salt solution, and the weak base is selected from matrine, motherwort, lysine, arginine or its combination;
[0039] (2) obtain anisic acid weak acid and weak base salt from described anisic acid weak acid and weak base salt solution;
[0040] (3) Dissolving the weak acid and weak base salt of anisic acid in a solvent at a molar concentration of 0.02-0.1 mol / L to prepare the preservative.
[0041] In the embodiment of the present application, the mixing reaction of anisic acid and weak base in water in step (1) includes: adding anisic acid and weak base to water, and stirring for 0.5-1 h.
[0042] In some embodiments, the anisic acid and the weak base are mixed in water at a molar rat...
Embodiment 1
[0057] The present embodiment selects matrine to be used as a weak base, and the preparation of the preservative comprises the following steps:
[0058] Take matrine and add it to water, then add anisic acid, and the product generated by the reaction under stirring is anisic acid weak acid and weak base salt, the molar ratio of the two is 1:1, and the stirring time is 0.5-1h; the product after the reaction is reduced Press distillation, recrystallization and drying treatment; preferably vacuum drying treatment, the temperature is 40-50 ° C, drying for 12-24 hours; obtain solid powder of matrine anisate; take the solid powder mass fraction of 1.5% and dissolve in 1 , 2-pentanediol, to obtain the natural preservative of Example 1 (the molar concentration of matrine anisate is about 0.037mol / L).
Embodiment 2
[0060] The present embodiment selects leonurine to be used as a weak base, and the preparation of the preservative comprises the following steps:
[0061] Take Leonurine and add it into water, then add anisic acid, and the product generated by the reaction under stirring is anisic acid weak acid and weak base salt, the molar ratio of the two is 1:1, and the stirring time is 0.5-1h; the product after the reaction is decompressed Distillation, recrystallization and drying treatment; preferably vacuum drying treatment, the temperature is 40-50 ℃, drying for 12-24h; obtain solid powder of Leonurine anisate; take 1.5% of the solid powder mass fraction and dissolve in 1,2 - In pentanediol, the natural preservative of Example 2 is obtained (the molar concentration of leonurine anisate is about 0.032 mol / L).
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