Fluorescent whitening agent is a kind of color conditioner, which has the function of brightening and brightening. It is widely used in many fields such as papermaking, textile and detergent. There are about 15 basic structural types of fluorescent brighteners and nearly 400 structures. Fluorescent brighteners for detergents are a class of fluorescent brighteners. At present, there are two types of fluorescent brighteners allowed to be added in laundry detergents in China: styrene-based biphenyls (such as CBS, etc.) and bitriazine amino styrenees (such as BLF, FBM, etc.).
Fluorescent whitening agent BLF
Active agent (anionic/non-ionic surfactant combination)
Softener (sodium citrate, sodium metasilicate, etc.)
pH regulators (alcoholamine compounds, sodium hydroxide, potassium hydroxide, methyl sulfonic acid, etc.)
Co-solvent (ethanol, glycol, glycerin, etc.)
Formaldehyde
Flavouring agent
water
toner
The principle of the fluorescent whitening agent is to absorb the invisible ultraviolet light in the light, and emit visible blue light, and the yellow light emitted by the fabric is superimposed to form a complementary white light, so that the white light emitted by the fabric increases, and the naked eye can feel the white fabric becomes obviously bright white, which is the whitening effect. Because the yellow light emitted by the fabric is reduced and the white light is increased, the naked eye can also feel the fabric that is complementary to yellow (such as: pink blue, pink, purple, etc.) is obviously more vivid and bright, which is the brightening effect.
Daily wear of white and colored clothing, most in the textile dyeing and finishing stage of the addition of fluorescent whitening agent, can improve the brightness of the fabric and offset the yellow gray tone of the untreated fabric, so that white cotton, white polyester cotton whitened, brightened, so that there is a need to supplement blue light colored cotton or polyester cotton to obtain the specific requirements of color. Therefore, in fact, most clothing materials themselves contain fluorescent whitening agents.
However, the fluorescent whitening agent in the clothing will be lost during wearing and washing, resulting in yellow white clothing and colored clothing is no longer bright. Adding an appropriate amount of fluorescent whitening agent for laundry detergent in laundry detergent can supplement this loss, play a color conditioning role, and restore the white clothes to the original bright white, more colorful clothes, and make the clothes bright as new.
This information is taken from experience without authorization
Fluorescent whitening agent FBM-EL is a special whitening agent for liquid detergent and should not be added to powder detergent
The whitening agent is an anionic compound and cannot be used simultaneously with cationic surfactants