Synthesis And Performance Research Of Modified Polyaspartic Acid

Along with the human environmental protection consciousness enhancement, therequirements of Green Chemicals also gradually improved. Poly aspartic acid hasbecome the research hot spot as a kind of polymer material that has superiorbiodegradable performance. It can be widely used in agriculture, chemical products,medicine, oil drilling fields, industrial water treatment field and so on. At present, thepreparation methods and the research of poly aspartic acid’s properties have got theachievement both in our country and abroad, but for its modification and the research ofpoly aspartic acid derivant’s performance remain to be completed. In this dissertationthey will be studied.This dissertation adopts the method of predecessors to synthesis intermediateproducts (PSI, poly succinimide) in solid phase, using maleic anhydride and ammoniumcarbonate as raw materials. The viscosity molecular weight of PSI was determined byviscometer. Modify PASP with di-ethanolamine and taurine in water system respectively.Analytical means such as FTIR was used to characterize the composition and structure ofPASP and poly aspartic acid derivatives. The effect of mole ratio, reaction temperatureand reaction time on scale inhibition rate of CaCO3is researched to optimize thesynthesis.The dispersibility and the resistance performance of poly aspartic acid and itsmodified products to calcium carbonate, calcium sulfate and calcium phosphate werestudied by static anti-scaling method under different dosages. The Ca2+concentration,temperature and pH value on scale inhibition rate of Ca3(PO4)2is researched to determinethe quantitative relationship. In addition, the corrosion inhibition rate was measured byweight loss. The function of different group in the process of scale inhibition, dispersingand corrosion inhibition is determined: hydroxyl groups can increase the scale inhibitionrate of Ca3(PO4)2, but the biodegradation rate was reduced, sulfo group can increase thedispersibility but reduce the scale inhibition. The scale inhibition rate of Ca3(PO4)2canreach94.57%under DHPAP8mg/L. The corrosion inhibition rate can reach90.36%under DHPAP50mg/L. The minimum light transmittance is45%under PASP-SEA 20mg/L. The biodegradability of PASP and its derivatives were examined byShaking-Bottle Incubating Test; it can be calculated by CODMn. The result shows that:PASP and PASP-SEA are readily biodegradable substances, DHPAP is Biodegradablesubstance.