ADDITIVES - Terms and definitions related used in the manufacturing of paint

On this occasion began with a compilation and explanation of terms related to the subject additives.

* Accession

Phenomenon of holding together two bodies Interfacial intimate contact based on physical (intermolecular forces) and also in some cases unions chemical through the interface. This is one of the main properties of paints, coatings and inks to be decisive in the behavior and

life of the coating.

Theoretically, the adhesion can be improved by increasing the contact surfaces (using or creating rough or porous substrates) by multiplying and reinforcing Interfacial contact points.

* Accession Promoters

Are additive to improve adhesion and duration, they can be generically called anchoring and adhesion additives.

They are of two different modes of use, including pre-treatment of the substrate and as a component of paint formulation.

They can be classified into three groups:

- Resin adhesion promoters (usually Oligomers)

- Additives Adhesion promoters (usually low MW compounds that act by chemical bonds)

- Additives wet substrates breeders (breeders physical anchor)

* Adsorption (physical adsorption)

Adsorption is defined as the action of adsorbing and this term as the attraction and retention of a body of molecules or ions of another body.

We can say more specifically that it is the difference in surface concentration (Interfacial) of a defined component (adsorbate) neighbor to the interface or solid surface (adsorbent) compared with the concentration in the rest of the solution (or suspension).

* Air trapped (microfoam)

This is a defect due to air in the paint film in the form of micro-bubbles and generally incorporated during the implementation process.

This trapped air can be attributed to insufficient wetting of the substrate, viscosity problems during the implementation, characteristics of some rapid methods of application.

* Anti - blocking

It is the property that prevents two painted surfaces stick entity if, depends mainly on the Tg of the / s resin, hardness and surface energy in general, as well as the roughness of the coating.
* Anticapa

Volatile additive capable of preventing the formation of "layer" or "skin" (surface layer dry) on the container, mainly in oxidative drying paints.

These additives act as antioxidants and are effective while the paint is in the closed container when it is applied or the container is not closed.

* Anti - sagging

Are additives, rheology modifiers, liquid coating which give higher viscosity at low shear. In order to improve

behavior or sag resistance or "trickle" of the paintings to be applied on vertical surfaces.

* Antifoam

Are additive to prevent or combat the foam mainly used in water paints

* Antifouling

Additives or system of marine paints to prevent fouling (scaling of organisms) on the coating of ship hulls that remain underwater.

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