Factors affecting the viscosity of carbomer gel
Carbomer gel is a gel made by absorbing water and swelling by carbomer or dissolved in alcohol. It has high transparency, good suspension performance and stable dispersion performance. It is widely used in cosmetics, toiletries, medical accessories, pet feed and other fields.
The performance of carbomer gel directly determines the quality of the applied product. The gel made of carbomer raw materials has a relatively high viscosity, but it does not form stickiness with other objects, and some The gel is easy to stick to the container and the equipment. The performance of carbomer gel is affected by the following factors:
Carbomer gel viscosity
1. Temperature affects carbomer viscosity
Temperature has a certain effect on carbomer gel. As the temperature rises, the kinetic energy of molecular motion increases, and the speed of motion increases. Due to the difference in volume between the gel molecule and the water molecule, the movement frequency of the two is inconsistent. As the temperature increases, the hydrogen bond between the gel molecule and the water molecule weakens, and part of the hydrogen bond breaks, which leads to the system’s failure. The viscosity is reduced. However, this effect is reversible, heating within 100 degrees and then returning to room temperature will restore the viscosity; if heated to 260 degrees, it will decompose completely in half an hour.
2. Electrolyte concentration affects carbomer viscosity
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. When adjusting the pH value of carbomer gel, the priority is to use triethanolamine, and less sodium hydroxide, which has a higher ionic strength.
3.Ultraviolet rays affect carbomer
Ultraviolet rays have a certain effect on the carbomer gel system, so keep it away from light. If irradiated with ultraviolet light for a long time, carbomer may deteriorate and deteriorate.
The above are several common factors that affect the viscosity of carbomer gel. The viscosity of different models of carbomer is also different. Desheng’s carbomer 980 has a slightly higher viscosity than carbomer 940 at the same concentration. The transparency of the gel is over 95%, and the gel performance is stable.
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