Precautions for use of carbomer CAS9003-01-4

Product Description

Carbomer is generally affected by temperature, electrolyte, ultraviolet and other factors.



The effect of temperature on kapham is as follows: when the temperature increases, the intermolecular motion intensifies and the molecular kinetic energy increases. Due to the difference in volume between gel molecules and water molecules, the motion frequencies of the two molecules are inconsistent. In this case, the hydrogen bonds between the gel molecules and water molecules break down as the temperature increases, resulting in the decrease of the viscosity of carbomer gel.



The effect of electrolytes on carbomer gel is as follows: ions will have a great influence on the viscosity of carbomer gel, and the subtle changes of ionic concentration can directly cause the dramatic change of carbomer gel concentration, which further affects the rheological properties of carbomer gel. The greater the concentration of electrolyte, the greater the viscosity of carbomer gel.



Common problems in using carbomer



1. Carbomer dissolves into clusters: This is because carbomer has very strong hydrophilicity. Powdery carbomer has very strong hygroscopicity. Like other hygroscopic powders, when it is put into water or other polar solvents by improper methods, it is easy to form clusters or not completely wet. Other powders will eventually decrease and dissolve after agglomerating, but carbomer is not easy to dissolve after agglomerating, because once the outer layer of the agglomerate is completely infiltrated, water is not easy to penetrate into the internal dry part, and finally agglomerate.



2, the transparency of carbomer gel decreases: This is because in some gel, in order to increase permeability, anticorrosion and solubilization, ethanol is often added as an additive, for example, disinfectant and gel free, of which ethanol is the main component, or its content can be as high as *5%. Carbomer gel is essentially a polymer aqueous solution. The stability of polymer solution is due to the existence of hydration film on the surface of the particle. The addition of strong hydrophilic non electrolytes (such as ethanol) will make the polymer solution flocculate. The carbomer ethanol gel prepared by different operation processes has different concentration of ethanol, and when the concentration of ethanol is too high, The finished gel will produce a little milky light and reduce the transparency of the gel.



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