Lesotho What are the paint defoamer for paints(1)

Lesotho Selection of antifoaming agents for different applications:

Flat coating

Features: Low viscosity, low defoaming pressure

Recommendation: Mineral oils or mineral oil modified polyethers

high

Elastic coating

unstable

Ink

UV

Features: High viscosity, high paint defoamer pressure

auxiliary

Recommendation: Polyether modified silicone

epoxy

Surface coating and film covering adhesive

The chemical methods to eliminate foam mainly include chemical reaction method and adding defoamer. The chemical reaction method refers to the chemical reaction between the foaming agent and the foaming agent by adding some reagents to generate water insoluble substances, thus reducing the concentration of surfactant in the liquid film and promoting the rupture of foam. However, this method has some shortcomings, such as the uncertainty of foaming agent composition and the harm of insoluble substances to system equipment. Nowadays, the most widely used defoaming method in various industries is the method of adding defoaming agents. The greatest advantages of this method are high foam breaking efficiency and convenient use, but finding suitable and efficient defoaming agents is the key.

not

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

Polydimethylsiloxane
Although it has good surface state control capabilities, it has many shortcomings, such as poor compatibility, which can affect the gloss of the coating film, and often lead to shrinkage, interlayer adhesion issues, and so on. The molecular weight of polydimethylsiloxane is different, and its compatibility and use are also different. Compared with silicone oil, organic modified polydimethylsiloxane has obvious advantages, not only retaining the advantages of siloxane, but also overcoming its disadvantages with modifiers, exerting many special functional effects. The key to the performance and use of modified siloxanes is their molecular weight, type, type of modified compound, and position in the molecule. There are many ways to modify them

Water in Water Colorful

Features: More surfactants, stable foam

Dispersant is a kind of interfacial active agent that has both opposite properties of lipophilicity and hydrophilicity within the molecule. It can uniformly disperse solid and liquid particles of inorganic and organic pigments that are difficult to dissolve in liquids, while also preventing particle sedimentation and condensation, forming amphiphilic reagents required for stable suspensions

Lesotho Recommendation: Use polyethers or mineral oil to modify polyethers

Precautions for use of paint paint defoamer:

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