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Modification and Characterization of polyaspartic acid

Author: GengChao
Tutor: WangFeiLi
School: Northwestern University
Course: Applied Chemistry
Keywords: Polyaspartic acid Glutamic acid Modified Scale Corrosion
CLC: TQ085.4
Type: Master's thesis
Year: 2010
Downloads: 202
Quote: 5
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Abstract


Polyaspartic acid is a biodegradable , environmentally friendly water treatment agent . Prepared aspartic acid and glutamic acid are copolymerized to obtain a copolymerization product , and the hydroxyl group and a sulfonic acid group are introduced to the aspartic acid / glutamic acid molecule of the copolymer (PAG) , were synthesized having a hydroxyl group and sulfonic acid groups of the modified products . Using thermal polycondensation method , aspartic acid and glutamic acid for the synthesis of PAG, to determine the relationship of a product with different proportions of the inhibition rate of aspartic acid and glutamic acid . : Reaction temperature of 190 ° C for 3h , aspartic acid : glutamic acid = 7:3 , the highest rate of calcium carbonate scale . To aspartic acid : glutamic acid = 7:3 PAG ethanolamine, sulfamic acid as raw materials were synthesized PAG different proportions of hydroxyl group and a sulfonic acid group - containing graft copolymer using the method of static experimental method and the hanging piece conducted a study on the performance of the synthesized product . The results showed that : synthetic aspartate / glutamate copolymer graft copolymer resistance calcium carbonate scale capacity declined , but with good blocking calcium phosphate capacity , corrosion performance , a new type of environmentally water treatment agent . Wherein the hydroxyl group with PAG graft ratio is preferably calcium phosphate scale inhibition performance : 0.6 hydroxylation PAG in calcium ion concentration as 120 mg / L , the calcium phosphate scale inhibition rate was 87.23% , while the polyaspartic acid calcium phosphate scale was only 1.5%. Inhibition ability PAG with a hydroxyl group , preferably having a graft ratio of 1 to 50 ° C under the experimental 4D Inhibition rate of 76.23% . PAG with a sulfonic acid group , preferably having a graft ratio of 1 calcium phosphate barrier capability, and its inhibition rate 89.65% . Sulfonated the PAG and hydroxylation PAG scale and corrosion inhibition mechanism was discussed . The results showed that the graft copolymer allows the calcium carbonate crystals are more prone to fracture and distortions , grain finer dispersion . Hydroxylation PAG adsorbed film is formed on the metal surface and slow down the corrosion of metals .

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CLC: > Industrial Technology > Chemical Industry > General issues > Chemical plant > Industrial water,water treatment > Water treatment
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