| Message: | The water swelling of carbomer mainly depends on the crosslinking density of polymers. If the crosslinking density is too high, the water molecules can not smoothly diffuse into the interior of polymer particles. Carbomer can not fully expand, and can not be uniformly dispersed in water or even produce stratification. If the crosslinking density is too low, although its water swelling is excellent, it will reduce the gel strength and increase the gel strength. The thickening effect decreased. In addition, the transmittance of carbomer is closely related to its water swelling property. Generally, the better the water swelling property is, the higher the light transmittance is. The crosslinking density is generally measured by measuring the water absorption of carbomer. Generally, the higher the water absorption, the lower the crosslinking density.
The crosslinking density of carbomer hydrogel increased with the increase of the amount of crosslinking agent. When the amount of crosslinking agent reached 2%, Carbomer hydrogel could not completely swell and precipitate in water. Therefore, in order to make carbomer have shorter wetting time and higher water absorption, it is necessary to control the amount of crosslinking agent, so as to control the crosslinking density of carbomer. |
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