By radical
calcium lignosulfonate solution copolymerization reaction at the surface of calcium lignosulfonate grafted acrylic acid, maleic anhydride,
polyethylene glycol (400) and other monomers synthesized new modified lignin calcium sulfonate superplasticizer, and their structures were characterized; study the new modified calcium lignosulfonate water reducing agent for entraining solution interface parameters and properties, adsorption surface of cement particles and Zeta potential dispersion of cement particles and cement paste reduction performance impacts, and analyzes the mechanism of action. The results show that the new modified
calcium lignosulfonate calcium lignosulfonate itself to overcome the entraining too much, retarding defects, and water reduction effect is obvious, that in its content is 0.5% under conditions of reduced water rate of 23.7%; cement paste 7 days and 28 days respectively,
the compressive strength of 94.6 MPa and 107.3 MPa.
Calcium
lignosulfonate from pulp waste liquor is lignin sulfonate obtained by a series of processing paper products, pulp digestion and waste paper pulp processing, reduce river pollution, environmental protection of an important environmental products.
Efficient application of
calcium lignosulfonate pulp and paper industry is an important driving force for sustainable development, but nevertheless, calcium lignosulfonate most widely used. Using multiple hydroxyl sulfonating agent for alkali lignin was modified lignin preparation sulfonate superplasticizer cement, by optimizing the modification process to determine the optimal process conditions: the solid content of 40% of the lignin-containing black liquor, adjusting the pH to 12, increasing the temperature to 60 ℃, adding 1% of the mass fraction of black liquor concentration of 30% hydrogen peroxide, the reaction 2 0min, warmed to 12 0 ℃, 9% mass fraction of black liquor is added to the polyhydroxy sulfonating agent, sulfonated 3h. Alkali lignin dispersant performance can reach the current level of
calcium lignosulfonate market. Old small soda pulp and paper companies pollute the water environment is very serious. Water pollution mainly from the pulp and waste produced during chemical pulping, commonly known as "black liquor" black liquor contains a lot of organic and inorganic, high COD value and chroma. In recent years, as people on a higher level of environmental concerns, research on treatment methods to explore a lot of black liquor.
With straw or wood pulp alkali lignin as raw material, through Mannich reaction with aliphatic polyamines, acylation of oil and sulfomethylation chloride reacts with the synthesis of a series of modified
calcium lignosulfonate acid amide-containing structures salt surfactant. interfacial properties of the modified lignin sulfonate were tested, discussed the impact of the mass fraction of surfactant and alkali content of the interfacial tension results showed that
the modified product has a very good surfactants,
Calcium lignosulphonate is a natural polymer, alone You can use the range of variation in the surfactant mass fraction and mass fraction of a wide base to form ultra-low oil - water interfacial tension, comply with the basic requirements of tertiary oil recovery.
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