LignoStar offers a wide range of lignin-based dispersants, processing aids, and binding agents for application in many different fields. The StarLig Premium products are specifically suited as high performance dispersants for agrochemicals, car battery additives, construction chemicals and dyestuff production. With specific molecular weight distributions, StarLig Premium products are designed to meet demanding requirements for formulating wettable powders, suspension concentrates and water dispersible granules.
STARLIG PREMIUM DISPERSANTS OFFER MANY ADVANTAGES
- Rheology control for dispersions and suspension concentrates
- Maintenance of particle suspension in dilute systems
- Binding of extruded, pan and spray-dried granules
- Superior suspension under extra-hard water conditions
- Binders, extrusion and suspension aids for extruded granules
- UV protection of photosensitive actives
The Vanillex product range is being produced by Nippon Paper in Japan. Vanillex comprises a modified set of lignosulfonates formed through the reactions of the sulfite pulp extract under alkaline conditions at high temperature and pressure, chemically treated to a high degree, followed by purification. In the treatment, lignosulfonate is subjected to hydrolysis, oxidation, de-sulfonation and demethylation. Therefore, Vanillex differs from conventional lignosulfonate.
The excellent dispersing effect of Vanillex is attributable to the unique proportion of hydrophilic groups such as sulfonate, carboxyl, phenolic OH groups in relation to the hydrophobic C6 – C3 skeleton. This proportion is much different from that in conventional lignosulfonate. Since Vanillex has been treated with an alkali at high temperature, it has excellent heat-resistance compared with conventional lignosulfonate.
Vanillex can also be applied as an additive for car batteries, where it functions as a battery expander. Just like other conventional products in this area (e.g. Vanisperse), StarLig Vanillex promotes the development of fine crystal sponge lead upon formation and then preserves this high surface area structure by preventing coarsening of crystals upon cycling in the negative electrode of lead-acid batteries. By doing so, Vanillex extends the battery life cycle and improves the cold-cranking capabilities as well as an increase in reserve capacity of the batteries.
StarLig Pearllex, also produced by Nippon Paper Industries in Japan, is a chemically treated, refined and highly purified, high molecular weight lignosulfonate. As of the high purity level of the lignin, Pearllex has excellent dispersion characteristics, heat stability and low humid absorption.
Pearllex dyestuff dispersants are recommended for Disperse, Vat, Reactive and Acid dyes.
|Disperse dyes||Typically offered in paste (liquid) and powder form. Classified by energy level. Usually require a primary dispersant.|
|Vat dyes||Typically offered in paste (liquid) and powder form. VaniStar is an ideal dispersant for liquid vat dyes.|
|Reactive dyes||Reactive dyes have traditionally been standardized with naphthalene sulfonates. Ultrasperse is popular in this application, due to its purity and low staining properties.|
LignoStar dyestuff dispersants are used either alone or in blended formulations to meet the specific requirements of a customer’s operation. The choice of dispersant(s) is dyestuff and process dependent.
Primary dispersants, such as Pearllex and Vanillex are mainly used to enable dyeing performance at higher temperatures.
Secondary dispersants, like Pearllex is used for milling and standardization. Pearllex has a very low insolubles and calcium content and is among the least staining products in the StarLig Premium product range. Milling with dispersant combinations/blends is an effective technique to reduce production cost.