The thickening mechanism of Kapom mainly consists of neutralization thickening and hydrogen bonding thickening.
one neutralization thickening
Because it contains a certain acid group, it needs to be neutralized alkaline in its application. After alkali neutralization, the carboxyl group of kapok resin is ionized. Due to the mutual repulsion of negative charges, the coiled molecular chains expand into a state of great expansion, increasing the original volume to about 1000 times, thus acting as thickeners. Common neutralizing agents include sodium hydroxide, potassium hydroxide, potassium bicarbonate, triethanolamine, etc. (clear gel can be obtained when pH is adjusted to about 7), which is the reason why Carbomer is sensitive to ions.
two. Thickening of the hydrogen bonding
As carboxyl donors, carbomer molecules can be thickened by binding to one or more hydroxyl groups to form hydrogen bonds, a reaction mechanism that requires time. The commonly used hydroxyl donors are non-ionic surfactants, polyols, etc