Types and applications of coating additives

Coating additives

Also known as water-based paint accessories, it is an auxiliary material for the preparation of coatings, which can improve the performance of the coating and promote the formation of the coating film.
There are many types, including driers, tougheners, emulsifiers, thickeners, pigment dispersants, defoamers, leveling agents, anti-skinning agents, matting agents, light stabilizers, anti-mold agents, and antistatic agents Among them, the most used are driers and tougheners.

Coating additives are an indispensable part of coatings.
They can improve the production process, maintain storage stability, improve construction conditions, improve product quality, and give special functions to com" href="">coatings online coatingol.

In the manufacturing stage

Initiator, dispersant, transesterification catalyst

The reaction process has

Defoamer, emulsifier, filter aid, etc.

In the storage stage

Anti-skinning agent, anti-sedimentation agent, thickener, thixotropic agent, anti-floating and blooming agent, anti-gelling agent, etc.

During the construction phase

Leveling agent, anti-crater agent, anti-sagging agent, hammer grain additives, flow control agent, plasticizer, etc.

The film formation stage has

Coalescing aids, adhesion promoters (also called adhesion promoters), photoinitiators, light stabilizers, drying, brightening, slipping, matting, curing, crosslinking, catalytic additives, etc.

In terms of conferring special functions, there are

Flame retardant, biocidal, anti-algae, anti-static, conductive, corrosion inhibition, anti-rust additives, etc.

Generally speaking, according to its use, it includes adhesion promoters, anti-blocking agents, anti-crater agents, anti-floating agents, anti-floating agents, defoamers, foam inhibitors, anti-gelling agents, viscosity stabilizers, Antioxidant, anti-skinning agent, anti-sagging agent, anti-precipitation agent, antistatic agent, conductivity control agent, antifungal agent, preservative, coalescence aid, corrosion inhibitor, rust inhibitor, dispersant, lubricant Wetting agent, drier, flame retardant, flow control agent, hammer grain additives, draining agent, matting agent, light stabilizer, photosensitizer, optical brightener, plasticizer, slip agent, anti-scratch Agent, thickener, thixotropic agent, etc.

Coating additives are substances that are added to coatings in addition to the main film-forming substances, pigments, fillers, and solvents, which can significantly improve a certain specific performance of the coating or coating film.
The dosage in the coating formulation is very small, mainly a variety of inorganic compounds and organic compounds, including high molecular polymers.

Coating additives are classified according to their functions in the process of processing, storage, construction, and film formation: 

Improve the performance of the coating production process: wetting agent, dispersant, emulsifier, defoamer, etc.

Improve coating storage performance and transportation performance: anti-settling agent, anti-skinning agent, preservative, freeze-thaw stabilizer, etc.

Improve coating performance: thixotropic agent, anti-sagging agent, resistance regulator, etc.

Improve the curing film-forming properties of coatings: driers, curing accelerators, photosensitizers, photoinitiators, co-filming agents, etc.

Paint film prevention performance: anti-sagging agent, leveling agent, anti-floating and blooming agent, adhesion agent, thickening agent, etc.

Give the coating some special properties: ultraviolet absorber, light stabilizer, flame retardant, antistatic agent, anti-mold agent, etc.

Common paint additives

Wetting and dispersing agent

The pigment is an aggregate of original particles.
The result of grinding and dispersing is to disaggregate this aggregate into the original particle state and disperse it in the paint.
Poor dispersion will result in incomplete depolymerization or re-flocculation, resulting in floating color, blooming, and flocculation.

Defoamer

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(3) Splashing During high-speed warm coating construction, small particles of paint will often be produced at the exit gap between the roller and the substrate, which is called atomization; when manual low-speed roll coating is called splashing;

(4) Cellulosic thickeners are easy to cause flocculation and phase separation of latex particles, which affect the stability of coatings.
Produce glue shrinkage phenomenon.