Summary of the principles and methods of adding paint additives

Introduction
in the paint formula contains such a substance, although the concentration is low, but has a significant impact on the performance of the coating, this substance is called paint additives. In general, we do not include the basic components of coating formulations in the scope of additives. Paint additives, also known as paint accessories, are auxiliary materials for the preparation of coatings, which can improve the performance of coatings and promote the formation of

. There are many kinds, including dedrides, tougheners, emulsions, thickeners, pigment dispersants, desolorizers, leveling agents, anti-cortides, anti-lighting agents, light stabilizers, anti-mold agents, anti-static agents (see plastic aids) and so on.
1, the classification of coating additives
Modern coating additives can be divided into four types:
1) to the paint production process of the effect of additives, such as deblisters, moisturizers, dispersants, emulsifiers and so on.
2) additives that act on the coating storage process, such as anti-cortides, anti-precipitation agents, etc.
3) Additives that play a role in the coating construction process, such as drying agents, curing agents, leveling agents, anti-flow hanging agents, etc.
4) Additives that act on the performance of the coating film, such as plasticizers, light-flat agents, mold inhibitors, flame retardants, anti-static agents, ultraviolet absorbents, etc.
2, The principle of adding coating additives
A coating additive is sometimes very effective for one formulation, effective for certain types of coatings, and useless for the rest. It is important to note that the very frequent use of coating additives will cause adverse secondary effects, especially carelessness or excessive use.
be careful not to cause "helix formulations" due to coating additives. For example, the use of surfactants can help moisten the surface, but foam is generated and then corrected with a silicone solution that causes contraction, which in turn is overcome by the active agent.
long-developed coating formulations, a wide variety of coating additives may be added to the hands of some paint formulators for expedidididis. When other troubles occur, it is wiser to remove paint additives rather than seek alternatives. Learned that today's paint formula designers often reduce the paint formula to only its basic components, paint additives only as the latest basic components, only to be added to the paint formula, and only when the latest audit is considered to be really necessary, to be added to the formula. Although some coating additives were originally added to overcome a batch of anomalies, they became permanent.
coating additives are always related to eliminating the disadvantages of coatings. When we want to figure out the shortcomings of coatings, they are often not precise enough, so it is necessary to understand the shortcomings of coating additives to overcome. In addition, foaming and biopic protection are two aspects that careless paint formulaters can easily overlook.
3, the addition of coating additives
paint additives according to its appearance can be roughly divided into powder, slurry and liquid three, in the state of the coating can be divided into dissolved and dispersed state.
1) Paint additives in powder appearance in the dispersion state:
add: add or grind the powder additives individually before grinding and then stir and mix in the paint phase;
add process: grinding points after mixing well with a variety of dispersion equipment grinding to the required fineness.
2) When the powder appearance of the coating aid in the dissolved state:
added: in the powder additive has the best solubility of the paint stage or parts added.
addition process: stirring, dispersing, dissolving evenly.
3) pulp appearance of the paint additives in the dispersion state:
added method: grinding points to add co-grinding, color display system production pre-coagulation after adding, painting phase to join,
adding process: grinding parts after mixing to disperse equipment grinding, dispersion or high-speed dispersion machine high-speed dispersion.
4) Liquid appearance of paint additives in the paint is generally dissolved:
addition method: if the amount of addition is too low, solid score is high, acid or alkali is too high, high reactivity and polarity with color display, it is recommended to dilute with a suitable thinner and then add to the coating, the other directly added.
the process: dilute and stir, or stir separately.
Subt:
coating additives are added with a focus on full dispersion (dispersion to desired fineness) or dissolution, the addition process pays attention to high concentrations of pre-dilution, and the order in which incompatible coating additives are added, followed by consideration of the convenience and safety added during the coating configuration phase. These generalizations are added in a way that serves as a reference to the addition process, and the different products offered by different manufacturers still need to be added according to the specific product's specifics and functions, which can be suggested in more detail from each manufacturer's product technical manual.
.