The Prepartion Of Guar Gum Derivatives And Application Research

Guar gum is a kind of galaetomannan polysaeeharide obtained from Cyamopsis etragonolobus seeds. The plant mainly grows in India, Pakistan, and North America. Because guar gum has excellent pHysical and chemical properties, and has been used in oil and gas field development of field widely, drug release, functional materials, textile industry and other industries. However, it has a few shortcomings, such as easily degradable, poorly resistance high temperature, easy carbonization and so on. So it is often chemically modified to improve its pHysical and chemical properties and expand it application fields, for example, esterification, etherification and oxidation. The main contents of this thesis are as follow:The synthetic process condition of methacryloyl chloride modification of guar gum is optimized by using the orthogonal experiment and single variable route. The effect on grafted substitution degree of product is studied by changing the reaction system composition, monomer ratio, reaction temperature, reaction time and catalyst dosage. FTIR and 1H-NMR are used for the confirmation of copolymer formation. The effects of different reaction conditions on the grafting are studied in detail. The grafting ratio was optimal under the following conditions:reactant ratio at 1 (GG 10g), sodium hydroxide at lg, reaction time at 3 h, temperature at 3?, oil-water ratio at 1.2 (toluene 100mL). The properties of product are also researched by the SEM, DSC, TGA, XRD, surface tension determine apparatus and rotary viscometer apparatus.Methacryloyl chloride modification of guar gum as raw materials, blend films are prepared by respectively adding the konjac, sodium alginate and chitosan in certain conditions. The relationship of the film blend containing different substitution degree of methacryloyl chloride guar gum between its mechanical properties, permeability properties and thermal stability is explored and get the preparation conditions of the mixed film, which has the best comprehensive properties.Research on the polymerization reaction what acrylamide is grafted methacryloyl chloride modification of guar gum. The effect on grafted rate degree is studied by changing the reaction system composition, monomer ratio, reaction temperature, reaction time and catalyst dosage. The graft copolymerization reaction was optimal under the following conditions:deionized water liquid at 150mL, methacryloyl chloride guar gum at lg, ammonium persulfate at 0.15g, sodium hydrosulfite at 0.12g, reaction time at 60min, temperature at 60?, pH at 8, acrylamide monomer at 3g. In these conditions, grafted rate is 110% and monomer conversion rate is 48%. Copolymerization product was characterized by 1H-NMR, FTIR, TGA, DSC, XRD and SEM. The grafted product metal ions absorption of property is also researched.Research on the polymerization reaction what 2-acrylamido-2-methylpropane sulfonate and N,N-Dimethylacrylamide are grafted methacryloyl chloride modification of guar gum. The effect of grafted rate degree is studied by changing the reaction system composition, monomer ratio, reaction temperature, reaction time and catalyst dosage. Copolymerization product was characterized by 1H-NMR, FTIR, TGA, DSC, XRD and SEM. The grafted product flocculation properties are also researched.Research on the polymerization reaction what styrene is grafted methacryloyl chloride modification of guar gum. The effect of grafted rate degree is studied by changing the reaction system composition, monomer ratio, reaction temperature, reaction time and catalyst dosage. Copolymerization product was characterized by 1H-NMR, FTIR, TGA, DSC, XRD and SEM. The grafted product bibulous and swelling properties are also studied.