Darvan® range of dispersing agents are highly effective dispersing agents for pigments and fillers in for water-borne paints and coatings.
| Product | Description | Benefits | Applications |
|---|---|---|---|
| Darvan® | Darvan® is a dispersing agent. | Anionic dispersing agent that disperse finely divided solids in water and help keep them dispersed. | Dispersing Agents are highly effective dispersants for mineral pigments and fillers in water-borne paints. |
| Darvan® 1 SPRAY DRIED | Darvan® 1 SPRAY DRIED is a sodium polynaphthalenesulfonate. | A general purpose dispersing agent. It is a granular product composed of sodium salts of polymerized alkyl naphthalene sulfonic acid. It increases paste flow, allowing a higher percentageof pigment to be mixed into a given amount of vehicle. | Used in a variety of pigments in aqueous systems, including carbon black, mineral colorants, organic dyestuffs, fillers, extenders, and clays. |
| Darvan® 7-N | Darvan® 7-N is a sodium polymethacrylate. | A sodium polymethacrylate-type dispersing agent, is a minimum foaming dispersing agent that is effective for dispersing mineral pigments in water-borne paints and coatings. | It is very effective for dispersing mineral fillers in latex paint formulas. |
| Darvan® 670 | Darvan® 670 is a sodium salt of polymerized naphthalene sulfonates. | The is a general purpose anionic dispersing agents. Darvan® 670 is Darvan® 670L is a 40% aqueous solution of Darvan® 670. | Used for the preparation of aqueous dispersions of colored pigments, dyes,extender pigments, etc. for water-borne paints and coatings. |
| Darvan® 670 L | Darvan® 670 L is a sodium salt of polymerized naphthalene sulfonates. | This is a general purpose anionic dispersing agents. Darvan®670L is a 40% aqueous solution of Darvan® 670. | Used for the preparation of aqueous dispersions of colored pigments, dyes, extender pigments, etc. for water-borne paints and coatings. |
| Darvan® 811 | Darvan® 811 is a sodium polyacrylate. | A sodium polyacrylate dispersing agent, is effective for high solids mineral slurries such as TiO2, kaolin, calcium carbonate, wollastonite, etc. | Uses as a deflocculant for clay water systems. |
Thank you for contacting us. In order to ensure you receive a quick reply, please fill in our contact us form. Let us know which product you are interested in and we can direct you to the right person.
Product and customer insights
CHALLENGE A 40-hectare raw water storage dam had persistent issues with blue-green algae (BGA) blooms, leading to taste and odor problems. Despite the presence of an aeration system to address water stratification and mixing, BGA counts remained seasonally high, particularly in summer and autumn. Upgraded aeration in 2018 did not resolve the issue, leaving the […]
The International Maritime Organisation (IMO) regulation, known as IMO 2020 was the the largest change in regulation relating to marine fuels impacting 75% of the fuel used by the shipping industry.
CHALLENGE A power plant relying on ultrafiltration (UF) and reverse osmosis (RO) faced a critical operational challenge. A wastewater treatment upset severely fouled the UF system, drastically reducing water production. Despite multiple cleaning attempts with sodium hypochlorite and citric acid, transmembrane pressure (TMP) remained high, and flux showed no improvement. The plant’s inability to meet […]
Keeping drilling costs low using Redi-Guard™ High Performance, an ecologically friendly drilling fluid technology with revolutionary rheological and shale encapsulation properties
CHALLENGE A municipal water reuse plant processing 8 million gallons per day (MGD) experienced severe fouling and scaling issues, including calcium phosphate and silica deposits. With steep feed pressure increases and differential pressures in both stages, the plant required frequent cleanings every 4 to 6 weeks, amounting to 32 cleanings annually. Each cleaning cycle resulted […]
The plant was experiencing weekly shutdowns for fiber clean up (~ 3 kg bags of matted slurry is cleaned per week). The shut downs were costly as they reduce plant availability for production.
CHALLENGE A municipal reverse osmosis (RO) plant on Florida’s west coast, with a 20 MGD capacity, faced high operational costs due to its reliance on 93% sulfuric acid for pH adjustment. The plant used a combination of a brackish water reverse osmosis (BWRO) membranes and fiberglass-wrapped membranes across 10 trains, each operating at 75% recovery. […]
CHALLENGE A gold processing plant in New Zealand sought to improve gold recovery efficiency while addressing high Total Organic Carbon (TOC) levels. Elevated TOC increased the Preg-Robbing Factor (PRF), reducing the plant’s ability to efficiently recover gold during the Carbon-In-Leach (CIL) process. The traditional use of kerosene as a carbon blanking agent offered limited efficacy, […]
CHALLENGE A municipal reverse osmosis (RO) plant, with a capacity of 2 million gallons per day (MGD), faced frequent system cleanings, every 2-4 months, due to rising feed pressure. The plant, which sources water from brackish wells and uses Toray TMG-20D-400 membranes in a (16×7) -> (8×7) train configuration, was operating at 78% recovery. Despite […]
Research indicates that Sea Buckthorn may be able to strengthen the immune system. One in vitro study focused on the possible immunomodulatory properties of Sea Buckthorn.
AWC A-110 effectively inhibited scale at a dosage of 3.5 ppm and an operating pH of 6.9. This increase in operating pH reduced the district’s annual acid consumption by ~$350K per year based on their current production.
MCI® -2020 V/O and ChemMaster’s Colorsil were chosen to repair and protect the walls based on their 20 year warranties and the fact that together they could fulfill the other specified repair design requirements.
Despite numerous cleanings, the productivity of the Reverse Osmosis plant would not recover from severe membrane fouling. The membrane autopsy revealed that the ferric hydroxide was seeding
silica polymerization and that even while the ferric hydroxide was removed, the silica scaling was continuing to grow.
The East Hokkaido region is known to have the highest volume of potato product in Japan. Unfortunately, a potato farmer in the area was experiencing a high rate of potato scab infection in his agricultural field.
A S Harrison & Co is committed to providing the highest level of customer service. Please drop us a line and we will get back to you soon.
