Lignosulfonic acid sodium salt

Catalog	ACFM-HP-A8061516
CAS	8061-51-6
Appearance	Yellow to orange or brown powder
Identification	(IR):To conform to standard
pH	7.0 - 10.0 (5% in water)
Sulfate	2.0 - 5.0%
Sample Lot No.	A24Q0818
Water Content	≤ 8.0%

Case Study

Sodium Lignin Sulfonate for Flame Retardant Cotton Fabrics

Shukla, Akshay, et al. Cellulose, 2019, 26, 8191-8208.

Sodium lignin sulfonate (SLS) has been studied as a flame retardant finish for cotton fabrics. Cotton fabric treated with 30% [w/v] SLS had an LOI value of 28.5 and a minimum char length of 4 cm (self-extinguishing). Studies have shown that SLS-treated fabrics inhibit the formation of flammable gases and provide UV protection without changing the physical strength of the fabric.
Treatment of cotton fabrics by SLS
· Bleached cotton fabric was subjected to various concentrations (20%, 25%, and 30% w/v) of sodium lignin sulfonate (SLS) in an aqueous medium. The treatment was applied using the hot padding technique, with a material-to-liquor ratio of 1:20. All concentrations involved a 10-minute immersion time prior to padding. Once the treatment was completed, the fabric was dried in a laboratory-grade stenter at 85°C for 5 minutes, followed by curing at 120°C for another 5 minutes.
· The results from the TGA demonstrate that SLS treatment not only aromaticizes the cotton substrate but also improves its char formation potential compared to untreated cotton. The char morphology of the SLS-treated cotton reveals that the treatment preserves the structural integrity, in contrast to the complete distortion seen in the char of the untreated fabric.

Modified Sodium Lignosulfonate as Detergent Builder

Ou, Juhua, et al. Journal of Wood Chemistry and Technology, 2017, 37(2), 99-109.

A surfactant (GLS) was prepared by modifying sodium lignin sulfonate (LS) with polypropylene glycol diglycidyl ether (PPGDE) for use as a detergent builder. It was found that GLS had higher surface activity, emulsifying ability, lime soap dispersing power (LSDP), and detergency than LS. In addition, the fiber morphology and whiteness retention value (up to 99.4%) showed that the decolorized GLS could prevent the staining of fibers in standard white cloth and showed better detergency.
Preparation of GLS and decolorizing process
· A three-necked round-bottom flask equipped with a mechanical stirrer and a thermometer was used to synthesize GLS. 10 grams of LS were dissolved in 80 mL of distilled water and adjusted to pH 11 using sodium hydroxide. A prescribed amount of PPGDE was then added, and the reaction was stirred at 70°C for 5 hours. The residues were removed by vacuum rotary evaporation, resulting in GLS1, GLS2, GLS3, and GLS4 with LS:PPGDE mass ratios of 5:1, 5:2, 5:3, and 5:4, respectively.
· To decolorize GLS, it was diluted to 10 wt% and treated with stoichiometric amounts of H2O2 at 50°C for 1 hour. For comparison, LS was also decolorized under the same conditions. The decolorized LS and GLS were dried at 70°C to obtain light yellow powders, labeled LSW and GLSW, respectively.