Alkali-swelling thickeners are divided into Non-conjugated alkali-swelling thickeners (ASE) and conjugated alkali-swelling thickeners (HASE), both of which are anionic thickeners. Non-conjugated ASEs are polyacrylate alkali-swelling emulsions. These thickeners such as ASE 60 from Rohm Haas and Visalex HV-30 from Ciba are hydrophobically modified polyacrylate alkali-swellable emulsions. However, there are two types of these thickeners, polyurethane containing and polyurethane free.
The amount of polymer dispersant
Although the use of polymer dispersants can increase the pigment concentration of the ground color paste. But there are two problems here: one is how high the pigment concentration is, and the other is how much dispersant is added and how to add it.
Each pigment has an optimal concentration value in a specific dispersion system. This optimal value is related to the specific surface area of the pigment, the oil absorption, the final fineness required, the grinding time and the characteristics of the resin polymer used in the color paste. It should be excellent ptfe wax determined through experiments based on these conditions. The equipment factor must be taken into consideration when experimenting.
The amount of dispersant can be consulted with the manufacturer. There is a common consensus principle that is based on the size of the specific surface area of the pigment. The larger the specific surface area, the more added.
The Dutch company EF KA recommends many methods for the addition of polymer dispersants .
The solid content of inorganic pigments and polymer dispersants can be calculated at 10% of the oil absorption value of the pigments.
For example, iron oxide red, the oil absorption is 35, and the solid effective content of the polymer dispersant should be 3.5%. The supply form of the dispersant has a solid content of 35%. According to the supply form, the molecule should be added with 10% of iron red.
The effective solid content of carbon black and polymer dispersant can be added at 20% of the DBP (dibutyl phthalate) adsorption value.
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