What is a pigment dispersant?
Dispersant or dispersing agent is defined as a surface-active chemical that has a solvating action on the solid particles (pigments or fillers) to be dispersed and thus promotes formation of dispersion by dispersing or suspending them.
What is Daniel Flow Point method?
Daniel Flow Gauge is a simple instrument is used to assess the ability of thick or paste-like materials such as paints or printing inks to flow. The product is poured into a semi-cylindrical reservoir.
What is water based pigment?
Water-based pigment dispersions are used instead of dyes in applications which require opacity, light stability and/or thermal stability. Pigments are particles and are generally more opaque than dyes, although some of our dispersions can be manufactured to be transparent.
Which is used in pigment grinding?
The most widely used surfactants for pigment dispersion in coating formulations are: Fatty acid derivatives. Phosphate esters. Sodium polyacrylates / polyacrylic acid.
Is water based pigment ink waterproof?
Pigment ink tends to resist water and UV light better than dye-based ink, and is able to resist fading for up to 200 years.
What is water-based pigment?
What is pigment grinding?
Pigment grinding is the essential step that allows powdered pigments to be transformed into smooth, liquid paint. The process is in itself an art form that receives little attention, even in the world of artists’ supplies.
How to determine the optimal dispersant loading for pigments?
It relies on the fact that viscosity reaches a minimum when the pigment surface is completely covered. A common test method is as follows: 1). Prepare the pigment slurry – Pigment content is high enough, such that a slurry is obtained after mixing in the absence of a dispersing agent.
What should you do after a pigment dispersion?
After the dispersion, make a simple poor-out of a small amount of paint diluted (10-20% in solvent or water). Pigment shock results of a poor pigment stabilization. Make a simple draw down and check the quality of the application : Color strength, transparency, gloss, general aspect.
How are dispersing agents used in pigment pastes?
A dispersant has to be added to the mill base. If it is not possible to use the binder in the mill base, the dispersion of the pigments has to be done by dispersing agents in a previous step. This has led to the development of (universal) pigment pastes.
How are dispersants used to maintain the state of dispersion?
Dispersants help maintain a state of dispersion by preventing settling or aggregation. WETTING: The formulator introduces the solid pigments into the liquid phase. In this phase, air and moisture entrapped at the pigment surface are displaced to the grinding medium liquid phase. The pigment / air interfaces become pigment / liquid interface.