Belarus What are the Free of silicone defoamers for paints(1)

Belarus Selection of antifoaming agents for different applications:

recoating

Flat coating

Features: Low viscosity, low defoaming pressure

acrylate

Recommendation: Mineral oils or mineral oil modified polyethers

Elastic coating

Features: High viscosity, high Free of silicone defoamers pressure

Recommendation: Polyether modified silicone

Surface coating and film covering adhesive

agent

Recommendation: Polyethers, which can effectively prevent surface defects and have a small impact on gloss

adhesion

There are many types of leveling agents, and the types of leveling agents used for different coatings are also different. High boiling solvent or butyl cellulose can be used in solvent based finishing agents. Surfactants or polyacrylic acid, carboxymethyl cellulose, etc. are used in water-based finishing agents.

Water in Water Colorful

Features: More surfactants, stable foam

dispersant

Powder is defined as a substance that can reduce the aggregation of solid or liquid particles in a dispersion system. When adding dispersants and suspensions to the preparation of emulsifiable concentrates and wettable powders, it is easy to form dispersants and suspensions and maintain the relatively stable function of the dispersion system

dispersant

Belarus Recommendation: Use polyethers or mineral oil to modify polyethers

Alkyl modified organosiloxane
As mentioned earlier, polyether modified polysiloxanes have some shortcomings; Alkyl modified polysiloxanes have precisely these advantages.
This series of polysiloxane products also belong to the comb structure. The molecular weight of this type of product is relatively small, around 10000, and n+m is about 30-50. The main purpose of modifying with alkyl is to improve thermal stability, compatibility, and unstable foaming, and even to have defoaming functions. However, as the modified alkyl chain increases, its ability to reduce surface tension also decreases

Precautions for use of paint Free of silicone defoamers:

Before use, stir thoroughly and mix evenly; Adding the paint while stirring; Before use, it is generally not diluted with water; The dosage should be appropriate. Excessive dosage can cause shrinkage, edge shrinkage, poor brushing performance, and other problems; Too little dosage leads to poor defoaming effect; Add it in two stages, namely, add it in the grinding stage and the paint mixing stage, generally accounting for half of the total amount each time. Use defoaming agents with good foam suppression effect in the grinding stage, and use defoaming agents with good foam breaking effect in the paint mixing stage