Thickener:Also known as rheology additive , can increase the viscosity of the coating system, which is also called rheological properties, hence the name of the rheological additive. Additives with insufficient viscosity can easily flow and appear as sagging on a three-dimensional surface. The greater the viscosity, the more difficult it is for sagging to occur, so thickening Agentcan solve rheological problems.
Leveling agent:The main function of leveling agent is to increase the fluidity of the paint, so that the paint after painting The system can level better and form a smooth, flat and uniform coating film. The better the fluidity of the paint, the greater the probability of sagging.
One is to reduce liquidity and the other is to increase liquidity , here is the contradiction between thickener and leveling agent. Improving one will definitely cause damage to the other. How to solve this problem?
In fact, either too much or too little liquidity will lead to defects. If the leveling property is too small, the paint cannot level well, which will greatly affect the appearance of the paint film. It will feel rough and the gloss will decrease; if the leveling property is too large, it will cause sagging. Therefore, only finding a balance between leveling and sagging can solve this problem.
This requires the selection of appropriate thickener and leveling agent products. Improper selection will cause adverse effects. If alkali-swelling thickeners thicken the water phase, the leveling properties will become very poor and the water resistance of the paint film will also decrease, so it is not suitable to be used.
