Hydrophobically modified ethoxylated aminoplast thickener (HEAT) turns the special amino resin into four end-capable hydrophobic groups, but the activity of these four reaction points is different. In the normal addition of the hydrophobic group, there are only 2 blocked hydrophobic groups, so the hydrophobic modified amino thickener synthesized is not much different from HEUR, such as Optiflo H 500, see Figure 3. If more hydrophobic groups are added, such as 8%, the reaction conditions can be adjusted to produce amino thickeners with multiple blocked hydrophobic groups. Of course, this is also a comb thickener. This hydrophobically modified amino thickener can prevent the viscosity drop of the coating due to the addition of a color paste and a large amount of surfactants and glycol solvents. The reason is that strong hydrophobic groups can prevent desorption, and multiple hydrophobic groups have strong association.