Wuhan Anji Taineng Environmental Sci-Tech Co., Ltd
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Lignin is a surfactant, can be modified, processed, compounding and other methods to produce a number of products, mainly used in resins, rubber, dyes, ceramics, cement, asphalt, feed, water treatment, coal water slurry, concrete, refractory materials, oilfield drilling, composite fertilizer, smelting, casting, adhesives. Experiments have proved that lignosulfonate is very effective in preventing sandy soil and can also be used as a desert fixing agent.
The properties of lignosulfonates made from different raw materials are different. Compared with the lignin sulfonate made from wheat grass, the lignin sulfonate made from trees has higher molecular weight and better dispersion. The size of the molecular weight of lignosulfonate depends on the raw material itself and the subsequent chemical modification. Under the same degree of sulfonation, the larger the molecular weight, the better the dispersion and suspension, because the larger the molecular weight, the greater the steric hindrance effect, which can prevent the lower layer or transfer of the original drug. The degree of sulfonation refers to the ratio of sulfonic acid group and total molecular weight, some units with millimolar gram ratio, the main reaction of the degree of sulfonation of lignin, the better the sulfonation, the better the water solubility, the high degree of sulfonation of lignosulfonate regardless of acid and base are dissolved well. If the degree of sulfonation is low, the solubility is certainly poor, and some cheap lignosulfonates also contain a lot of alkaline lignin, which affects the solubility of the lignin. Therefore, lignin with a high pH value has poor dispersibility because of its high alkaline lignin content.
The type and content of salt will affect the dispersion effect of lignosulfonate, the pH of sodium salt is generally high (about 10), the pH of calcium salt is slightly lower, and the dispersion suspension performance of sodium salt is slightly better, but not obvious. The amount of salt in lignosulfonate will affect the viscosity, stability, dissolution rate and dispersion of the product. The content of impurities such as sugar and fiber will have a certain impact on the properties and dispersibility of lignosulfonate. Too much sugar will cause moisture absorption agglomeration, which will cause lignin to harden over a long period of time, and the dispersibility and dissolution rate will be affected.
At present, the new materials obtained in the modification of lignin are:
1, lignin phenolic resin by adjusting acid, alkalinity to control the reaction order of lignin with phenol or formaldehyde to prepare phenolic resin. The insulation and modulus of phenolic resin at high temperature were obviously improved by introducing lignin into the resin while maintaining mechanical properties and thermal stability.
2, lignin-based polyurethane: the active hydroxyl group of lignin and isocyanate inverse
It should be possible to prepare polyurethane materials. The derivative is blended with epoxy resin
3, lignin derivatives and epoxy resin blend, epoxy modified lignin, etc.
4, Colloidal properties of lignin can be prepared hydrogels. Lignin-based adsorption materials with strong adsorption properties can be obtained.
5,Lignin filled with rubber. Many active groups in the rigid network and compliant side chain structure of lignin are fine particles with large specific surface area. Only the lignin is chemically modified to improve the compatibility of lignin and rubber, and then as a rubber reinforcing agent has the advantages of small specific gravity, good gloss, wear resistance and bending resistance.
