Sodium lignosulphonate is an important organic compound with the chemical formula C20H24Na2O10S2. It usually appears as a yellow-brown free-flowing powder, and sometimes in liquid form. It has no special odor, is non-toxic, is easily soluble in water and alkali solution, and is easily precipitated in the presence of acid, and has a strong dispersibility. The product has stable chemical properties and will not decompose in long-term sealed storage.
Its aqueous solution is chemically stable and biodegradable. It is unaffected by pH fluctuations and is insoluble in common organic solvents such as ethanol and acetone. Its aqueous solution is brown to black and exhibits colloidal properties. Solution viscosity increases with increasing concentration. Sodium lignin sulfonate has little effect on reducing interfacial tension between liquids, cannot reduce the surface tension of water, or form micelles. Its dispersing effect primarily relies on adsorption and desorption from the substrate and the generation of charge.
As a multifunctional and highly effective chemical additive, sodium lignosulphonate powder can be widely used in many fields such as construction, mining and smelting, agriculture and fertilizers, petroleum and energy, environmental protection and soil improvement,etc.
| Items | Sodium Lignosulfonate |
| Appearance | Yellow Brown Powder |
| Dry Matter % | 92 min |
| Lignosulphonate % | 60 min |
| Moisture % | 7 max |
| Water insoluble matter % | 0.5 max |
| Sulphate (as Na2SO4) % | 4 max |
| PH Value | 7.5-10.5 |
| Content of Ca and Mg % | 0.4 max |
| Total reducing matter % | 4 max |
| Content of Fe % | 0.1 max |
| Packing | Net 25kg PP bags; 550kg jumbo bags; |
Main Uses of Sodium Lignosulphonate
Especially in the construction projects industry, sodium lignosulphonate can be used as an efficient and environmentally friendly concrete water reducer, which has a wide range of application prospects and important economic value. It is particularly suitable for large-volume concrete, high-fluidity concrete, pumped concrete, commercial concrete and summer concrete construction. At the same time, it is also suitable for concrete projects with special requirements for slow setting, such as cast-in-place pile concrete, pipe-sinking pile concrete, artificial bored pile concrete and underground large-volume concrete construction.
As the first generation of ordinary concrete water reducing admixture, sodium lignosulfonate has the characteristics of low cost, low ash, low gas content, environmental friendliness, and strong adaptability to various cements. When used as a concrete water reducer, sodium lignin sulfonate can improve the fluidity and plasticity of concrete, reduce water consumption, and improve compressive strength. Specifically, the main advantages of sodium lignosulfonate in concrete are reflected in the following aspects:
- The water reduction effect is obvious. The dosage of sodium lignin sulfonate water reducer is usually 0.20-0.30% of the cement dosage, and the commonly used dosage is 0.25%, and its water reduction rate can reach 9-11%. This means that while keeping the workability of concrete unchanged, the amount of mixing water can be significantly reduced, and the density and strength of concrete can be improved.
- Enhance concrete strength. Under appropriate dosage, sodium lignosulfonate can significantly improve the early and late strength of concrete. Compared with the benchmark concrete, the 3-day strength can be increased by 15-20%, the 7-day strength can be increased by 20-30%, and the 28-day strength can be increased by 15-20%.
- Improve concrete workability. The sodium lignosulfonate water reducer can increase the fluidity of concrete, improve its workability, and make the concrete mixture more uniform and easier to construct.
- Save cement. While keeping the slump and strength of concrete the same as the benchmark concrete, the use of sodium lignosulphonate can save 8-10% of cement. Every ton of sodium lignin sulfonate water-reducing agent powder used can save 30-40 tons of cement, which has good economic benefits.
- Improve impermeability and durability. Sodium lignin sulfonate water reducer can improve the impermeability and durability of concrete, reduce the shrinkage and creep of concrete, and is beneficial to large-volume concrete and summer construction.
- Delaying the setting time. After adding sodium lignosulphonate, the initial setting time and final setting time of concrete will be delayed. This is particularly beneficial for summer construction, transportation of commercial concrete and large-volume concrete projects and can effectively avoid problems caused by too fast setting.
