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How to use Carbomer Thickening in personal care

2018-05-24


Carbomer is white and loose; it is acidic, hygroscopic, and has a special odor, soluble in water, ethanol, and glycerin. Commonly used concentrations of 0.1% to 3.0%. Because its molecule contains a large number of carboxyl groups, the aqueous solution should pay special attention to use after alkali neutralization to reduce the skin and mucous membrane irritation.


Carbomer neutralizing agents include sodium hydroxide, potassium hydroxide, potassium bicarbonate, borax, amino acids, polar organic amines such as triethanolamine. Laurylamine and stearylamine can be used as neutralizing agents in non-polar systems. The neutralized Carbomer hydrogel is most viscous between pH 6 and 11, such as pH12, and the viscosity decreases, and the presence of a strong electrolyte also reduces the viscosity. The gel is not stable, and it easily grows on exposure to sunlight and quickly loses its viscosity. Addition of antioxidants can slow the reaction.


The Carbomer 940 has a highly effective thickening effect and produces clear, transparent water or ethanol-hydrogels with very short rheological properties. It is suitable for all kinds of cosmetics. Such as: moisturizing cream, lotion, cleansing products, sunscreen products, alcohol-free perfumes, fragrance conditioners (enhanced gloss, easy combing) and so on. Carbomer 940 produces highly effective thickening at very low dosages (conventional amounts of 0.25-0.5%) to produce emulsions, creams, gels and transdermal preparations with a wide range of viscosity and varying rheology. 


After Carbomer is neutralized, long-term stirring or high-shear mixing will cause loss of viscosity


·Existence of ions - electrolytes reduce thickening efficiency


· Ultraviolet light - Long-term ultraviolet radiation will reduce the viscosity of Carbomer gel. pH>/=10, insensitive to UV radiation


Temperature change - Carbomer gel is not affected by temperature Microorganisms 


Carbomer does not support the growth of bacterial molds, and bacterial mold growth does not affect gel properties. Conventional dosage is 0.2-0.4%, which can replace 3-7% of conventional emulsifiers.


The Carbomer polymer has almost no surfactant properties, so adding 0.1 to 0.5% of a surfactant with a low HLB value can modulate the oil phase particles to a smaller size to produce a white, creamy cream product.



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