What factors affect the viscosity of carbomer
Carbomer is a white, loose powder, acidic and hygroscopic, with a slight special smell. It is soluble in water, ethanol, and glycerin. The usual concentration is 0.1% to 3.0%. As an efficient thickener, suspending agent and gel matrix, it is widely used in the cosmetics field. As a thickener, a very important factor is the viscosity of carbomer, and different product application requirements The corresponding viscosity values are different, so what factors affect the viscosity of Carbomer? Desheng analyzes three points here for your reference.
1. The greater the degree of molecular expansion, the greater the carbomer viscosity
Carbomer is a copolymer of polyalkyl sucrose or polyalkyl pentaerythritol and acrylic acid cross-linked polymer. Because it is a polymer, its composition actually refers to the monomer composition of acrylic acid or acrylate before polymerization. In the state of dry powder, the carbon chains of a single acrylic molecule are relatively tightly aggregated, but after being easily dissolved in water, the molecules will gradually disperse and form hydrated molecules with water molecules to disperse the tight carbon chains, so the viscosity of the entire dispersion system Also began to increase. The greater the degree of expansion of the carbomer molecule, the greater the viscosity. Usually, neutralizing agents such as sodium hydroxide or organic amines are added to make it fully stretched.
2. PH value will affect the viscosity of carbomer
Different carbomers have different hydrogen ion concentrations when they reach the maximum viscosity. The viscosity of carbomer dispersions first increases and then decreases with the decrease of PH value, that is, the thickening efficiency increases from high to low. The PH value when the Bohm reaches the maximum viscosity is different, but the viscosity values of the more commonly used carbomers are relatively stable between the PH value of 6-7, and there is little change. The carbomer 940 and carbomer 980 produced by Desheng can reach the maximum viscosity when the PH value is 6-8.
3. The concentration of electrolyte will affect the viscosity of carbomer
Ions have a great influence on the viscosity of the carbomer gel. A slight change in the ion concentration can cause a drastic change in the viscosity, thereby affecting the rheological behavior of the entire gel system. The greater the concentration of electrolyte, the more significant the decrease in the viscosity of the gel. The presence of strong electrolytes can also reduce the viscosity. It should be emphasized that the carbomer gel is unstable, and it is easy to grow mold and lose viscosity when exposed to the sun. The addition of antioxidants can slow down the reaction.
Carbomer 940 and Carbomer 980 produced and developed by Desheng have been very good after customer use. Because different application requirements require different viscosity, Desheng's carbomer viscosity can be customized according to customer requirements. If you have product requirements or any technical questions, please click on the official website to consult customer service.
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