Different Types of Wash Off Agents
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Different Types of Wash Off Agents:
Caustic Soda (NaOH)
Sodium hydroxide (NaOH), also known as lye and caustic soda, is an inorganic compound. It is a white solid and highly caustic metallic base and alkali of sodium which is available in pellets, flakes, granules, and as prepared solutions at different concentrations. Sodium hydroxide forms an approximately 50% (by mass) saturated solution with water.
Sodium hydroxide is soluble in water, ethanol, and methanol. This alkali is deliquescent and readily absorbs moisture and carbon dioxide in air.
Sodium hydroxide is used in many industries, mostly as a strong chemical base in the manufacture of pulp and paper, textiles, drinking water, soaps and detergents and as a drain cleaner. Worldwide production in 2004 was approximately 60 million tons, while demand was 51 million tons.
Soda Ash (Na2CO3)
Sodium carbonate (also known as washing soda, soda ash and soda crystals, and in the monohydrate form as crystal carbonate), Na2CO3, is the water-soluble sodium salt of carbonic acid.
It most commonly occurs as a crystalline dehydrate, which readily effloresces to form a white powder, the monohydrate. Pure sodium carbonate is a white, odorless powder that is hygroscopic (absorbs moisture from the air). It has a strongly alkaline taste, and forms a moderately basic solution in water. Sodium carbonate is well known domestically for its everyday use as a water softener. Historically it was extracted from the ashes of plants growing in sodium-rich soils, such as vegetation from the Middle East, kelp from Scotland and seaweed from Spain. Because the ashes of these sodium-rich plants were noticeably different from ashes of timber (used to create potash), they became known as “soda ash”. It is synthetically produced in large quantities from salt (sodium chloride) and limestone by a method known as the Solvay process.
Sodium Bicarbonate:
Sodium bicarbonate (IUPAC name: sodium hydrogen carbonate) is a chemical compound with the formula NaHCO3. It is a salt composed of sodium ions and bicarbonate ions. Sodium bicarbonate is a white solid that is crystalline but often appears as a fine powder. It has a slightly salty, alkaline taste resembling that of washing soda (sodium carbonate). The natural mineral form is nahcolite. It is a component of the mineral natron and is found dissolved in many mineral springs. It is among the food additives encoded by the European Union, identified as E 500. Since it has long been known and is widely used, the salt has many related names such as baking soda, bread soda, cooking soda, and bicarbonate of soda. In colloquial usage, the names sodium bicarbonate and bicarbonate of soda are often truncated. Forms such as sodium bicarb, bicarb soda, bicarbonate, bicarb, or even bica are common. The word saleratus,
from Latin sal æratus meaning “aerated salt”, was widely used in the 19th century for both sodium bicarbonate and potassium bicarbonate.
Hydrose
Sodium dithionite (also known as sodium hydrosulfite) is a white crystalline powder with a weak sulfurous odor. It is the sodium salt of dithionous acid. Although it is stable under most conditions, it will decompose in hot water and in acid solutions. It can be obtained from sodium bisulfite by the following reaction.
2 NaHSO3 + Zn → Na2S2O4 + Zn(OH)2
Some other wash off agents:
Oxinol 894 Special
Levelling and dispersing/solubilizing agent for the dyeing of cellulose fibers with Reactive dyes. Increases the solution stability of Reactive dyes in high alkaline electrolyte solution. This is particularly important when Phthalocyanine and Anthraquinone Blue reactive dyes are employed in high concentrations.
Oxinol A11 H / C
Levelling and complexing agent for preparation & dyeing of Cotton with Direct & Reactive dyes by solubilizing such dyes. Disperses insoluble cotton by-products in scouring and dyeing cycle. Effective in washing off unfixed Reactive dyes.
Oxinol A11 New Conc.
Levelling and complexing agent for preparation & dyeing of Cotton with Direct & Reactive dyes by solubilizing such dyes. Disperses insoluble cotton by-products in scouring and dyeing cycle. Effective in washing off unfixed Reactive dyes.
Oxinol A24
Levelling and dispersing/solubilizing agent for the dyeing of cellulose fibers with Reactive dyes.
Oxinol AII
Special dye leveler, scour assistant & dispersant for fastness improvement of reactive & direct dyes. IMO, GOTS approved, Global Organic Textile Standard approved.
Redoxal OSS
Combined oxidizing and soaping agent for sulphur dyestuffs. REDOXAL OSS is more environmentally friendly than products based on bromates or bichromates. REDOXAL OSS enables oxidizing and after soaping of sulphur dyes to be carried out in a single process stage.
Surfox RC
Low foaming washing auxiliary to assist in wash off of disperse dye prints. Recommended as an additive for traditional reductive clearing and after clearing of thermosol dyeing.
Winscour GB Conc.
Preparation of woven goods made from 100% CO and PES/CO.
Winscour RDC
One bath reduction clearing of disperse dyes and wash off of reactive dyes.
Winscour RED
Simultaneous removal of unfixed reactive dyes and reduction clearing of disperse dyes for use in continuous dyeing of polyester/cellulose material. One bath reduction clearing of disperse dyes and wash off of reactive dyes.
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Latest posts by LearnTextiles (see all)
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