Optical Brightening Agents for Textiles
The use of optical brightening agents in the textile chemical processing is rapidly gaining globally recognition because of their non-toxic and eco-friendly characteristics with the increasingly important requirements for textile manufacturers to make the fabric white at a desired level in textile production. One kind of whitening treatment is anti – biotic. The appearance and handle of cotton knits can be significantly improved by treatment with cellulose and such treatment leads to improve brightness of dyed fabric.
Sunwhite Chemicals is one of the leading manufacturers of OBAs for textiles.
Fluorescent Brightening Agents for Textiles
Optical brightening agents (sometimes called Optical brighteners, fluorescent brightening agents (FBAs), or fluorescent whitening agents (FWAs), optical bleaches) are one type of compound which, when applied to a textile material, absorbs the short wavelength electromagnetic radiation (300-400 nm) which is invisible to the human eye, and converts it into visible light of longer wavelength between 400 and 500 nm, which is emitted either as violet, pure blue or greenish blue. Because the main use of these dyes in laundry detergents and textile finishing. Optical Brightener are generally found in domestic waste waters that have a component of laundry effluent. Its characteristic is the incident light to generate fluorescence excitation, so that the stained material was similar fluorite sparkling effect, to the naked eye to see the material is white, especially when added to a yellowish-white material. Fluorescent whitening agents may be used to whiten or brighten a textile or paper material. Furthermore, well all round fastness property and a good yield are also desired. In addition to this, different shades of whites are desired, as white shades are subject to fashion trends, they are requires to be used on a verity of finishing processes and they should be compatible with practically all chemicals and auxiliaries used at different stages.
Sunwhite Chemicals is one of the leading manufacturers of OBAs for textiles.
Chemistry of Optical Brightening Agents for Textiles
About 80% of all optical brightening agents (OBAs) produced are derived from stilbene derivatives, the latter absorbing in the ultra violet regions at (α) = 342 nm. All optical brighteners are dyestuffs, but in place of the chromophoricsystem which is the characteristic for dyes, it contains a fluorescening system and like a normal dye certain substituent which promote the affinity, depending on the type of fiber on which it is applied. In this manner, brighteners which are suitable for cotton are more or less substantive derivatives of diaminostilbenedisulphonic acid. The stilbene derivatives can be present in two isomeric forms, i.e. in the Cis configuration and in the Trans configuration. Optical brightening agents in the Trans form can be made both in the powder and liquid form. The Cis form, which is rapidly formed under the action of light from the trans form will not go on cotton and for this reason, the solutions of this whitener is protected against light. Many of the optical brighteners are derived from the heterocyclic compounds containing nitrogen atoms.
Chemicals Manufacturer Sunwhite Chemicals – Manufacturer of Optical Brightening Agents for Textiles
Chemical Constitution of Optical Brighteners
Optical brightening agents are usually derivatives of:
· Triazine-stilbenes (di-, tetra- or hexa-sulfonated)
· Coumarins
· Imidazolines
· Diazoles
· Triazoles
· Benzoxazolines
· Biphenyl-stilbenes
Sunwhite Chemicals – Chemicals Manufacturer of Optical Brightening Agents
Whiteness & Brightness of Optical Brightening Agents
To the trained observer, even bleached are whit textile material has a slight yellow tinge. This small amount of yellow can give the impression of slight soiling and may detract from their aesthetic appeal the presence of slight amount of blue gives the impression that the textile material is whiter. Before advent of OBAs. Improved whiteness was obtained using a laundry blue, which is a blue pigment.
The development of OBAs had meant that this slight addition of blue can be obtained through the light reflected by the OBAs in the presence of ultraviolet radiation. This makes white textile whiter and brighter. Colored textile materials tend to appear brighter. OBAs are present in most domestic but these are usually only suitable for cellulosic textile material.
Optical Brightening Agents Manufacturer for Textiles
