Sodium lignosulfonate is a natural polymer, a reaction product of wood pulp with aqueous sulfur dichloride and sulfite, a by-product of pulp production, generally a polymorph of 4-hydroxy-3-methoxybenzene. It has strong dispersibility, with different degrees of dispersion due to different molecular weights and functional groups. It is a surface active substance, which can be adsorbed on the surface of various solid masses, and can perform metal ion exchange, and can also produce condensation or hydrogen bonding with other compounds due to the presence of various reactive groups in its organization.
Sodium lignosulfonate has surface physical and chemical properties such as dispersion, emulsification, solubilization and adsorption due to its special structure, and its modified products are applied as mineral nutrient surfactants, and the production process is mature.
Application principle of sodium lignosulfonate.
Depending on the material from which lignin is extracted, the number of carbon chains varies greatly. Some are suitable for fertilizer production and some are suitable for pesticide additives. Contains a variety of active functions, dispersion, chelating properties easy to combine with metal elements to form a chelated state, improve the physical and chemical properties of metal nutrients, save costs and improve efficiency. The adsorption and slow release nature of lignin can better maintain the effectiveness of chemical fertilizer and can make it slow release, is a good organic compound fertilizer slow release material. Lignin is a polycyclic polymer organic substance containing many negatively charged groups, which has a strong affinity for high-valent metal ions in the soil.
Sodium ligninsulfonate can also be used as pesticide processing. Lignin has a large specific surface area and contains many reactive groups, which can be used as a pesticide retardant.
The lignin in the plant and the lignin after separation are structurally different. Plant cell division action newly generated cell wall thin, rich in pectin and other acidic polysaccharides, and gradually generate cellulose and hemicellulose, the cell is differentiated into a variety of unique xylem cells (wood fibers, tubular cells and ducts, etc.), when the formation of secondary wall S1 layer, began to form lignin from the corner part of the primary wall, this phenomenon is generally called lignification (lignification). Lignification develops with the maturation of plant tissues to the intercellular layer, primary wall and secondary wall. Lignin is gradually deposited within and between cell walls, binding cells and cells together. In the process of lignification of plant cell walls, lignin penetrates into the cell walls, increasing the hardness of cell walls, promoting the formation of mechanical tissues, and enhancing the mechanical strength and weight-bearing capacity of plant cells and tissues; lignin makes Lignin makes the cell wall hydrophobic, making the plant cells less permeable to water, providing a reliable guarantee for the long-distance transport of water, minerals and organic matter in the plant; the infiltration of lignin into the cell wall objectively also forms a physical barrier, effectively preventing the invasion of various plant pathogens; preventing the conductive molecules in the xylem from infiltrating water, while enabling land plants to survive in a relatively arid environment, and It enhances the disease resistance of plants. Lignin plays an adhesive role in plants against cellulose, hemicellulose and inorganic salts (mainly silicates).
Factors affecting lignin decomposition are soil pH, moisture and climatic conditions. Other factors: such as nitrogen effectiveness and soil mineralogical properties also have an influence. Among them are the adsorption of Fe and Al oxides on lignin, which can reduce the decomposition of lignin.