Lignin,Lignosulfonate ,Magnesium Lignosulfonate,Calcium Lignosulfonate3￼
Study of oxidation, sulfonation reaction and chemical modification method water-reducing dispersion property of wood magnesium.The results showed that the influence factors of product performance, the most important change is the amount of H2O2 oxidation of Fenton, followed by the reaction time, reaction solution concentration, amount of ferrous sulfate, the optimal process conditions: reaction solution concentration is 20%, the dosage of 10.0g/100g wood magnesium ferrous sulfate, hydrogen peroxide dosage is 50.0g/100g wood magnesium, the reaction temperature is 80 ℃, the reaction time is 3.5H, compared with before modification, the water cement ratio is 0.40, its content is 0.40%, the fluidity of cement paste increases from 148mm to 186mm; NaHSO3, Na2SO3 and Na2S2O5 as sulfonating agent, on the wooden magnesium in sulfonation modification, the results show that Na2SO3 sulfonation the best modification effect, but was modified with amino sulfonic acid and methyl sulfonic acid, no significant effect.
While the oxidation and sulfonation modification process for the water reduction reaction product dispersion increases a little, and even make the performance slightly worse, that oxidation for improving wood magnesium a minor role in the reaction activity of sulfonated segment.To st
udy the effects of naphthalene sulfonate graft copolymerization and magnesium on properties of wood.The results show that the effect of grafting modification, performance of the product is the main factor in hydrolysis, condensation segment after the acidity of the reaction temperature, wood magnesium addition time and amount.Synthesis of graft copolymer suitable technological conditions of products for the amount of wood: magnesium is 8.47%, after hydrolysis acidity is about 30%, the reaction temperature and condensation section is 105 ~ 110 ℃, first within 1.0h after formaldehyde, after adding wood magnesium solution.
When the water- cement ratio is 0.32, its content is 0.60%, the fluidity of cement paste reached 194mm products with graft.
The wood of magnesium and other superplasticizers with different ratio of mixture of cement paste fluidity varies with time.