Canadian Finishing and Coatings Manufacturing

May 25, 2021

EvonikEvonik’s newest additive is a product for binder-free pigment pastes that has a low VOC content and a low influence on paste properties such as color strength and viscosity.

TEGO Humectant 7005 is effective against drying of pigment concentrates, while its influence on water resistance and other paint properties remains low, Evonik says. This combination makes it especially suited to a wide range of applications, such as architectural paints or industrial coatings.

The formulation of paints and coatings is a laborious and complex process in which all components must be carefully coordinated. One of the challenges is the short drying time of binder-free pigment pastes. The addition of a humectant extends this so-called “open time” until drying, but usually affects the coating properties. For example, it reduces the water resistance of the formulation, which is particularly important for industrial coatings.

“Keeping the balance here is an important task during development,” says Frank Kleinsteinberg, Head of Pigment Concentrates Application Technology. “For the formulator, it is important that the humectant maintains the paste properties, such as color strength, stability, compatibility or viscosity, and shows little influence on the coating properties.”

With its low VOC content combined with its effectiveness and low impact on coating properties, TEGO Humectant 7005, which is available worldwide, can be used more widely than, for example, PEG 400, and makes the formulator’s work easier, Evonik adds.

www.coatino.com

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CFCM slingpsychrometer 400Paul N. Gardner USA, global distributors, producers, and designers of quality physical and inspection instruments for the paint, coatings, and related industries, has introduced a new offering: The compact, portable Sling Psychrometer.

As an easy way to measure relative humidity levels quickly, this uniquely compact Bacharach Sling Psychrometer accurately determines per cent relative humidity without the necessity of consulting complex tables. There is no need to wet the wick each time a reading is taken, and it contains a slide rule calculator which correlates wet and dry bulb thermometer indications for direct reading of relative humidity. When not in use, the thermometer case telescopes into the handle for protection.

The Sling Psychrometer consists of two thermometers that are turned by vigorously swinging the handle and exposing the thermometers to rapid air movement. These two thermometers are called dry bulb and wet bulb. The bulb of one thermometer is placed in direct contact with the room air to measure dry-bulb air temperature. The bulb of the other thermometer is covered with a silk or muslin sleeve that is kept moist to record the wet bulb temperature. Evaporation cools the wet bulb more than the dry bulb, and the humidity is obtained as a function of change in temperature. The atmospheric humidity is determined by calculations, steam tables, or using a psychrometric chart. Gardco.com  

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