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 effectGood 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 .



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