sodium lignosulfonate

Sodium Lignosulfonate Description

Sodium lignosulfonate, also known as lignosulfonate acid sodium salt, is brown powder in appearance. It has no special peculiar smell, is non-toxic, soluble in water and lye, precipitates in acid, and has strong dispersion sbility. Sodium lignisulfonate is a water-soluble multifunctional polymer electrolyte, which has the ability to disperse biological slime, iron oxide scale and calcium phosphate scale. It can also form stable complexes with zinc and calcium ions. As a commonly used concrete admixture, it has the advantages of low cost and environmental friendliness. In addition, it can also be used in many other industrial fields. Feel free to inquiry us for sodium lignosulfonate price now.

Sodium Lignosulfonate Specification

Items Sodium lignosulfonate
Appearance Yellow Brown Powder
Dry Matter % 92 min
Lignosulphonate % 60 min
Moisture % 7 max
Water-insoluble matter % 0.5 max
Sulfate (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;

The Role of Sodium Lignosulfonate in Concrete

The addition of sodium lignosulfonate into concrete will cause the hydrophobic groups to be adsorbed on the surface of the cement particles, making the cement negatively charged. Because cement particles with the same charge repel and disperse each other under the action of the charge repulsion. The flocculent structure formed in the initial stage of water addition becomes a dispersed structure. Thus release the free water in the flocculated aggregate, thereby achieving the purpose of a water reducing agent.

With the addition of sodium lignosulfonate, there are fewer capillary pores left by the evaporation of free water, and the internal structure is dense. That is to say, the reduction of porosity is obviously conducive to the improvement of concrete strength. At the same time, it also improve the size and distribution of the pore structure of cement. The speed of crystal growth is delayed and the crystal growth is more complete, so more fibrous crystals are interspersed with each other to form a strong network structure, which significantly increases the strength of the concrete. Therefore, mixing lignosulfonate acid sodium salt water-reducing agent in concrete can reduce the water consumption of the concrete mixture, reduce the water-cement ratio, improve workability, facilitate pumping, and improve concrete strength, compactness and durability.

Main Performance of Ligosulphonate Powder Water Reducer in Concrete

  • Improve concrete performance. The addition of lignosulfonate powder can reduce water consumption by 10-15%, increase strength by 10-20% in 28 days, and increase strength by about 10% in one year.
  • Saving cement consumption. When the strength and slump of the concrete are similar, the cement can be saved by about 10%.
  • Improve the workability of concrete. When the amount of cement and water used in the concrete remain unchanged, the slump of low-plasticity concrete can be increased by about two times.
  • Retarding effect. After adding 0.25% sodium lignin sulfonate, when the slump of the concrete is basically the same, the initial setting time of ordinary cement is delayed by 1-2 hours, slag cement is cement is 2-4 hours, and the final setting time is 2 hours for ordinary cement and slag cement is 2-3 hours.
  • Reduce the early hydration heat of cement. Comapred to that without the addition of sodium lignosulphonate, the appearance time of the exothermic peak is delayed. 
  • Increase the air content of concrete. The air content of blank concrete is about 1%, and the air content of concrete mixed with 0.25% lignosulfonate acid sodium saltis about 2.3%.
  • The secrete water rate is reduced. Under the condition that the slump of concrete is basically the same, the secrete water rate of admixed with lignosulphonate acid sodium salt can be reduced by more than 30%.
  • Dry shrinkage performance, At the initial stage, compared with the concrete without the addition of sodium lignosulfonate, it was basically close to or slightly reduced, and at 28 days and later, it increased slightly, but the increase did not exceed 0.01% (0.01mm/m).
  • Improve the compactness of concrete and improve the impermeability of concrete.
  • No chlorine salt, no corrosion hazard to steel bars.

Other Sodium Lignosulfonate Uses

The addition of sodium lignosulfonate in the process of preparing coal water slurry can increase the output of the mill, maintain the normal state of the pulping system, reduce the power consumption of the slurry, and increase the concentration of the coal water slurry. During the gasification process, the oxygen consumption and coal consumption decrease, but the cold gas efficiency increases. The coal water slurry can reduce the viscosity and reach a certain degree of stability and fluidity.

In the manufacturing process of large-size wall and floor tiles and refractory bricks, the water reducer can make the raw material particles of the green body firmly bond. And it can increase the strength of the dry green body by more than 20%-60%.

When as a dispersant and filler for vat dyes and disperse dyes, it can increase the color power of the dye, make the coloring more uniform, and shorten the time of dye grinding. In pesticide processing, it can be used as filler, dispersant and suspending agent, greatly improving the suspension rate and wetting performance of wettable powder.

It can be used for pressing spheroids of iron ore powder, lead-zinc ore powder, pulverized coal, and coke powder. Also for pressing of cast iron and cast steel sand molds, extrusion molding of mud brick walls and floor tiles.

Improve fluidity in crude oil transportation and reduce energy consumption. In petroleum products, it is as a cleaning agent, dispersant, high-alkaline additive, anti-rust agent, anti-static agent, emulsifying viscosity reducer, wax removing agent, etc.

Blending Lignin and its derivatives with polyvinyl chloride (PVC), polyethylene (PE), polyvinyl alcohol (PVA) and other olefin polymer materials can improve the stability, strength and anti-photolysis properties of the material.

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