What are the applications of lignin powder? Industrial lignin comes from papermaking waste liquid. The lignin extracted by acidification at room temperature usually has larger particles and needs to be processed into powder by a lignin Raymond mill in order to be well used. For example, in the rubber industry, fine-particle lignin compounds have a reinforcing effect in both NR and NBR, and the degree of reinforcement for NR is greater. In addition, lignin powder can also be used as coupling agent and reinforcing agent for rubber, dispersant for dyes, viscosity reducer for drilling mud, desulfurizer for industrial waste gas, etc.
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1. Application of lignin powder in industry
The properties of industrial lignin vary depending on the plant species, acquisition method or isolation method. But from a structural point of view, they all have non-polar aromatic ring side chains and polar sulfonic acid groups, and are both lipophilic and hydrophilic. This gives it good surface activity and dispersibility. It can be used as cement water reducer, cement grinding aid, asphalt emulsifier, drilling mud conditioner, water blocking agent and profile control agent, heavy oil viscosity reducer, surfactant for tertiary oil recovery, coal water slurry additive, surface active agent agents and dye dispersants, etc.
2. Application of lignin powder in agriculture
Lignin is widely used in agriculture, mainly as fertilizers and additives for various fertilizers, pesticide slow-release agents, plant growth regulators, soil improvers, etc.
(1) Fertilizer: Currently, there are many reports on the use of lignin to produce fertilizers, mainly through the use of lignin structural units in the benzene ring and side chains. Lignin contains a variety of active groups, has strong integration and colloidal properties, and can complex with some trace elements such as Fe, Cu, and Zn. It is called an organic trace element fertilizer. For example, lignin-iron chelated micro-fertilizer can supply soluble iron to plants and prevent iron deficiency in plants.
(2) Use as a pesticide sustained-release agent: Due to its large specific surface area and light weight, lignin can be fully mixed with pesticides. In particular, there are many active groups in the molecular structure, which can chemically combine with pesticide molecules through simple chemical reactions. Even if there is no chemical reaction, various secondary bonds will be generated between the two, allowing pesticides to be slowly released from the network structure of lignin. Lignin also has a strong ability to absorb ultraviolet rays and can stabilize photosensitive and oxygen-sensitive pesticides. Lignin itself is non-toxic; it can slowly degrade in the soil, and ultimately no pollutants will remain.
(3) As a plant growth regulator: Lignin is degraded by dilute nitric acid and then neutralized with nitrogen water to produce o-quinone plant growth hormones. This hormone has a significant effect on promoting the growth of plant seedling roots and improving transplant survival rate. It makes the leaves of the plants greener and larger, which helps the rice mature earlier. It has a certain yield-increasing effect on crops such as rice, wheat, cotton, tea and white spinach.
(4) As a soil conditioner: The ammoniated sulfate lignin obtained by treating papermaking black liquor with the sulfate method can be used as a soil conditioner to improve compact, salty and corroded soil, so that the soil can form a granular structure. , thereby changing its water characteristics and promoting the fertilizer efficiency of P, N, Fe, etc. For example, using 2% ammoniated lignin and 1% ammoniated thiolignin as a soil conditioner with high salt content can wash away the salt in the soil with water, which is very beneficial to the improvement of many saline-alkali lands in my country. In addition, the soil conditioner formulated with lignin: sodium hydride: hexamethylenetetramine = (100-120): (10-12): (20-30) (based on dry weight) can be applied to various applications. Various types of soil, such as forest tundra, sandy soil or solid soil, etc.
3. Other applications of lignin powder
In addition to its good applications in the above-mentioned industrial and agricultural fields, lignin is also used in medicine as a raw material for methyldopa (vasodilator) or dopa (Parkinson's disease drug) to manufacture the antibacterial synergist TMP , anti-inflammatory agents, anti-cancer agents and stimulants, etc. In the metallurgy and metal industry, lignin products can be used as auxiliary binders for green and dry sand molds for casting, shell molds, gas disintegrants, sand fluidity improvers, etc. It can be used as a dispersant and leveling agent for disperse dyes and azo dyes in the printing and dyeing industry. Lignin is also widely used as a dispersant in the manufacture of refractories, bricks and ceramic vessels.
What are the applications of lignin powder? Whether from the perspective of environmental protection or the use of waste resources, the application of lignin powder is a topic with good social significance and economic value. If you have the need to grind lignin and need to purchase a lignin Raymond Mill, please leave us a message to learn more about the equipment.
