Matting agents

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Matting of high solids coatings

Environmental restrictions challenge the varnish manufacturer to find new ways to reduce the shares of organic solvents in their formulations. One possibility to realize products in accordance to these restrictions is the formulation of high-solids, in which the shares of volatile organic compounds have been reduced or removed.
In conventional coating systems, the matting by means of porous silica particles is dependent on the shrinkage of the film due to solvent evaporation during the drying process.

In high-solids systems, the matting is more difficult because there is hardly any shrinkage during film formation. In this case, the formation of a micro-rough surface depends i. a. on viscoelastic forces which appeal during the film formation on the matte particles.
The matting agents of the PS-Matt series have been specifically developed by Pigmentsolution with the aim to provide an optimal interaction with the viscoelastic forces occurring during the film formation phase, whereby the matting is positively influenced.
By this operation, PS-Matt products are able to generate an excellent matting effect.

Advantages:

high shear stability, grind resistance
no formation of hard sediments during storage
no influence on curing
no impairment of the interlayer adhesion
abrasion-resistant films of high surface quality
no fogging
minimal impact on the mechanical properties of the film,
z. B. hardness or flexibility
minimal impact on weather resistance

Matting of water-thinnable systems

The matting mechanism of waterborne dispersions is similar to the matting mechanism of systems based on solvents.

Due to the relatively high proportion of volatile constituents, the coating film shrinks quite considerably during the drying and thus forms the required micro-rough surface structure for the light scattering and the dulling effect. With the help of highly effective PS-Matt systems high quality and haze-free surfaces with low gloss values can be achieved.
The range of PS-Matt W portfolio was developed specifically for the matting of water-reducible coatings. Because of their exceptional product features PS-Matt W systems should always be used when the focus is on the incorporation and handling of the matting agent.

Advantages:

low dust generation
reduced wetting time
less foaming
prevents the binding agent from coagulating

PS matt 601

PS matt 112

x 500

x 1000

x 3500

PS matting agent

PS-Matt products can be used for:

Furniture and parquet varnishes
UV industry
Paint industry
Printing inks

Synthetic amorphous silicas have been used in the paint industry for over 20 years. Since then, Pigmentsolution GmbH has done intensive research to meet the constantly growing requirements for this application.
A number of new products with specific properties have been developed for this purpose. The increasing demand for matt lacquer systems, be it from a fashion point of view or to increase safety through the absence of glare or for general product improvement, led to the targeted development of silicas, which are used to matt surfaces.
This brochure describes the physicochemical properties as well as the areas of application of the PS-Matt products and gives recommendations for practical use.
We are happy to provide you with additional information and help you work out recipes.

Matting agent requirements

Easy dispersibility
Good floating behavior in the liquid paint
Wide range of uses
High matting performance with low additions
Easy setting of any desired degree of matting
Little influence on the rheological properties
Little influence on the mechanical and chemical properties of the paint film surface
High transparency of the coating
Quality constancy
Chemically inert

Brief description and properties

a) Precipitated silica:

Physico-chemical characteristics

1 Based on the original material ** Depending on the concentration and
2 Based on the dry substance (2 h / 105 ° C) coating system
3 Based on the annealed material (2 h / 1000 ° C) na = not applicable

Applications

* OPV = overprint varnishes

Systems

Layer thickness

The practitioner is aware that thicker layers of lacquer are generally more difficult to matt. A dry paint film thickness results from the thickness of the applied wet film and the solids content of the paint. The lower the layer thickness of the
dry paint film, the more matting agent particles are effective on the surface and the more matt the paint film surface appears. However, the higher the solids content of a paint and thus the dry film thickness of a paint, the more
the matting agent particles have the option of being arranged in an energetically favorable manner with the same concentration in the paint.

This means that they are not effective in roughening the surface, and the paint film appears glossier.

In order to set an equivalent degree of matting, a larger amount of matting agent is required. This is especially true for systems with a solids content of> 70%.

Product safety

Synthetic amorphous silicas and their surface-treated variants do not contain any crystalline components.

X-ray diffraction, high-resolution transmission electron microscopy and
Electron diffraction used. The detection limit of these methods is less than 0.05 percent by weight. In addition, transmission electron microscopy offers the possibility of determining solid-state structures up to a dimension of 0.5 nanometers.
Based on the results available, PS-Matt can be described as completely amorphous.

Toxicology

From decades of experience it is known that the intended use of PS-Matt does not lead to any health damage. The acute toxicity of synthetic amorphous silica, rat oral, LD50, is above 5,000 mg / kg. PS-Matt does not irritate the skin or eyes.