Due to its balanced polarity and 100% active ingredient, DISPERBYK-2013 achieves excellent pigment dispersion stability, especially in 100% UV-curable systems, and is particularly effective for organic pigments and carbon blacks.
DISPERBYK-2013 exhibits excellent and effective viscosity reduction during the above-mentioned dispersion process, while eliminating the thixotropy of the flow behavior. The long-term storage stability of printing inks with DISPERBYK-2013 is also significantly improved. The highly deflocculating properties of this wetting and dispersing additive make it suitable for use in printing inks with superior appearance properties, especially for color strength and transparency.
UV-curable printing inks and pigment concentrates
PVC and CPVC L
The PVC of the latex paint discussed is less than 70%. PVC stands for the pigment volume concentration. The volume mentioned here is calculated from the true density, but in fact the volume of the powder used in the coating is composed of the bulk density. In other words, CPVC can more accurately describe the structure of the coating film.
Regardless of PVC or CPVC, it is for the coating film, not the coating, so the continuous phase—water is ignored, but water is inseparable for preparation and construction. Many formulators attach great importance to the concept of PVC, in other words, they underestimate the influence of water on the formulation.
In the formula, Vp—pigment volume;
Vg base material volume.
The critical pigment volume concentration of a single pigment CPVC:
CPVC-1/[1+(OAX pp) /93.5]
Where PP is the density of the pigment;
OA-oil absorption of a pigment;
93.5——The density of linseed oil×100,
Mixed pigment CPVC calculation:
CPVC=1/[1+(ngO A; Xpp i+ngO Az Xpp 2) /93.5]
In the formula, n——the volume fraction of each pigment in the total pigment; other symbols have the same meaning as the above formula
Same; subscripts 1, 2 indicate the first pigment and the second pigment.
The calculation of CPVC for mixed wax for pigments is for reference only, and the actual measurement shall prevail.
Neither PVC nor CPVC involves water.
As an architectural coating, the substrate has a high water absorption rate, so formulators have not paid enough attention to controlling the amount of water, and even believe that water can be used as a means to reduce costs. In fact, the amount of water should only be limited to meet the requirements of preparing fluids. The treatment of the substrate before the construction of domestic coatings is generally batch putty. For the convenience of construction and polishing, low bulk density inorganic materials are used to prepare putty. Its water absorption is too high, which causes the paint to be mixed with water before painting. The improper substrate treatment results in the performance of the latex paint formulation design. Accommodating putty, this is putting the cart before the horse. Excessive water has many negative effects.
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