Overview of the application of guanidine carbonate in depilatory creams
The application of guanidine carbonate in depilatory creams benefits from its mild alkaline properties, which can effectively soften and decompose hair keratin, making hair easier to fall off. The following are guidelines and suggestions for guanidine carbonate in depilatory creams:
Dosage
The addition amount in depilatory creams is usually controlled between 2-5% to ensure effectiveness while avoiding irritation to the skin. In formula design
Formula example
-Guanidine carbonate: 3%
- Thioglycolate (active ingredient): 5-7%
- Humectants (such as glycerin, propylene glycol): 3-5%
- Emulsifiers: such as cetearyl alcohol or PEG-40: 2-3%
- pH adjusters (such as citric acid or sodium bicarbonate): appropriate amount to keep the pH of the formula between 7-9
- Preservatives: such as phenoxyethanol or potassium sorbate: appropriate amount
Precautions
During the preparation process, ensure that the solution temperature does not exceed 50°C to avoid affecting the stability of guanidine carbonate.
It is critical to control the pH value
It is recommended to conduct skin irritation testing
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Application Trends
As consumers demand for mild, non-irritating formulas, guanidine carbonate is increasingly valued as a less irritating alkaline ingredient. Its relatively low odor properties also make it more suitable for use in fragrance-free or low-fragrance products. In addition, natural or plant-extracted ingredients
Precautions
1. Skin tolerance: Although the alkalinity of guanidine carbonate is relatively mild, people with sensitive skin still need to be cautious. Strictly control the method and amount of use.
2. Stability: Guanidine carbonate may decompose at higher temperatures. It is recommended to store it at a temperature not higher than 25°C and avoid long-term direct sunlight.
3. Odor control: The odor of guanidine carbonate is relatively light, but when used with other alkaline ingredients, the odor stability needs to be tested to ensure user experience.
Disadvantages
1. Hair removal strength: Compared with traditional hair removal active agents (such as thioglycolate, sodium hydroxide), the hair removal effect
2. pH control: Due to the alkalinity of guanidine carbonate, pH control during the preparation process is critical. Deviations may cause skin discomfort or even burns.
3. Ingredient cost
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Guanidine carbonate, when dissolved in water, dissociates to release ions that increase the alkalinity of the solution. The increase in pH is crucial as it initiates a chemical reaction with the keratin in the hair. Keratin, which is a fibrous and insoluble protein, is composed of a complex arrangement of amino acids held together by various bonds. In a normal physiological state, these bonds give the hair its strength and structure.
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2 个月In chemical depilatories, guanidine hydroxide is used as a highly effective keratin dissolving agent. Its strong alkalinity can destroy the keratin in the hair, making it easier to remove the hair.