Effectively reduce the surface tension of the system and improve its wettability and permeability to the substrate.

Main types, feature and applications of substrate wetting agents

2019-07-15

Variety	Feature	Application
Traditional surfactants (mainly anionic or nonionic)	Poor water resistance Easy to foam and stabilize foam cheap price	Putty and low-grade system
· Fluorocarbon polymer	Efficient Reduce static surface tension Good effect on contaminated substrates Easy to cause surface problems Not easy to control High price	Very difficult to attach substrates And contaminated substrates
PSAMS	Wetting effect、Good resistance to foaming, shrinkage and water resistance	Wide adaptability Common application
Non-silicon non-fluorine	Minimize possible defects Minimize possible defects Low water sensitivity Low foaming Good dynamic effect expensive	All kinds of coating

The ideal wetting agent should contain the following aspects:

1. Effectively reduce the surface tension of the system and improve its wettability and permeability to the substrate.

2. Foaming and foam stabilization as low as possible.

3. As low a water sensitivity as possible.

4. Does not affect interlayer adhesion

5. A good balance of surface tension can improve the wetting of the substrate without affecting the leveling or defects due to excessive reduction of surface tension.

Generally, the dosage of levelling agent is 0.1%~1.0%, and it is better to control it at 0.3%. When the defoaming agent exceeds the quantity, in order to overcome shrinkage cavity, the dosage of levelling agent can even exceed 1% in the putty formula without levelling agent .

Sinograce Chemical produces water based additives, such as thickener, crosslinking agent, wetting agent.

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