Viscosity measurements of latex paints in the area of high shear rates (ICI-viscosity)

Viscosity measurements with a Brookfield or Stormer viscometer are standard in R&D and QC of latex paints. However, they only cover a part of the shear area (low shear and mid shear) to which the paints are handled. The area responsible for the rheological behavior of the paint when painting with a brush, roller orContinue reading “Viscosity measurements of latex paints in the area of high shear rates (ICI-viscosity)”

1000 hrs in a UV chamber, but how many years in the real world?

As an external laboratory testing our formulations and samples of our customers, we often hear this question. We performed tests in a UV or xenon chamber, and the client, after receiving the report, asks “why is there no real world equivalent years?” In this article, we answer why there are no and will not beContinue reading “1000 hrs in a UV chamber, but how many years in the real world?”

Oil absorption of pigments and fillers

The oil absorption value is an integral record in technical data sheets of fillers and pigments used in paints. But what is the significance and what are the methods of determining the oil absorption? There are many myths about this parameter and there are several methods of laboratory OAV (oil absorption value) determination. In thisContinue reading “Oil absorption of pigments and fillers”

Separation of the water layer – a few words about syneresis in latex paints

The appearance of a water film on the surface of latex paints is a common phenomenon. It is often passed over to the agenda, because after mixing this phenomenon subsides and the paint is not difficult to homogenize as in the case of settling. But what is this phenomenon and how to prevent it? SyneresisContinue reading “Separation of the water layer – a few words about syneresis in latex paints”

ASTM D2486 – why it is the most demanding method of scrubbability testing?

Regarding the latex paint tests, the wet-scrub test is one of the most popular tests performed for wall, ceiling and facade paint coatings worldwide. One of the test methods is ASTM D2486, which is the most frequently performed scrub test in our laboratory and is a useful method both for comparing the quality of variousContinue reading “ASTM D2486 – why it is the most demanding method of scrubbability testing?”

Let-down process in the production of latex paints

In many start point formulations, you can see raw materials divided into the grinding stage (in cowles dissolver or bead mill) followed by a process called let-down in which the raw materials such as polymer dispersion, coalescent, defoamer and thickeners and some other additives are listed. You can often find in the practice of paintContinue reading “Let-down process in the production of latex paints”

Formulating premium class latex paints for the US market

The DIY sector expects more and more premium class paints. Latex paints for interior painting are at the forefront of these expectations. Excellent hiding power, low or zero-VOC, no reactive VOC, perfect application properties in the hands of a non-professional painter are only part of the customer’s expectations. The parameters of the durability of theContinue reading “Formulating premium class latex paints for the US market”

Troubleshooting surface scratches with additives in DIY 1K WB acrylic clear wood varnishes

DIY water-borne clear varnishes are an important market segment that allows non-professional painters to paint themselves. They do not require specialized spraying equipment, and their coatings are easy to apply. They must also be resistant to everyday use, e.g. scratches caused by cleaning, accidental moving of objects or abrasions. One of the properties that canContinue reading “Troubleshooting surface scratches with additives in DIY 1K WB acrylic clear wood varnishes”

What is coatings mar resistance

In many applications, coatings require resistance to accidental damage, such as scratches or dents caused by moving objects on them. One of such applications are coatings of furniture paints, which, in addition to a number of properties such as blocking resistance or resistance to household chemicals, also need resistance to accidental scratches caused by movingContinue reading “What is coatings mar resistance”

Elimination of mudcracking in latex paints by microfibrillated cellulose additives

The application of thick layer water based latex paints is generally seldom made on purpose. Typically wet film thicknesses of 25 – 50 µm (1 – 2 mils) are applied and generally very little is exceeded when wet film is exceeded 100 µm (4 mils) per wet film application. Of course, specially selected latex paintsContinue reading “Elimination of mudcracking in latex paints by microfibrillated cellulose additives”