Preparation Of Polylactic Acid Microcavity Array And Study On Acidityresponsive Release Inhibitor

In the commonly used metal corrosion protection technology,reasonable addition of corrosion inhibitor is an effective anti-corrosion method.The metal surface can be pretreated before the metal contacts the corrosive medium.The single corrosion inhibitor coated metal plate does not protect the metal effectively for a long time and the preparation process is complacated.Therefore,how to effectively improve the protection performance about metal still need further research and exploration.In this thesis,polylactic acid based microchamber arrays are prepared by a one-step dip-coating process then by micro-transfer printing onto a flat substrate.The microchambers were filled with a dye,which served as a corrosion inhibitor model for p H responsive release sensor.It studies releasing rate of the ability of loading different concentrations of corrosion inhibitor in different solution environments.Moreover,the degradation of the polylactic acid microcavity array film are sensitive to environmental condition,such as the surrounding p H value,and it abides degradation kinetics,this p Hresponsive polylactic acid film can be used to control the encapsulation model corrosion inhibitor to release.The degradation rate of polylactic acid microcavity array film under different p H environmental conditions over time,compared with neutral p H or acidic p H,alkaline p H degrades polylactic acid microcavity array film significantly is faster.And the discovery of first-order degradation kinetics shows the possibility of p H controlled release kinetics of polylactic acid films.Compared to stimuli that require external energy sources,p H is advantageous as stimulus for release,because there is no need to apply an external stimulus.Both low p H and high p H help to increase the solubility of polylactic acid,thereby increasing the release of model corrosion inhibitor.The degradation of polylactic acid is due to first-order kinetics and is highly dependent on time and p H.It was found that the model corrosion inhibitor can be released by dissolving the polylactic acid microcavity wall,where p H 13 and p H 11 the model corrosion inhibitor can be released from the microcavity within 1 day totally,however the almost neutral p H value cannot release 50% even during week.This laid an important foundation for the accelerated corrosion test to evaluate the corrosion resistance of the coating.The prepared polylactic acid microcavity array film is loaded with a corrosion inhibitor 2-mercaptobenzothiazole,and different concentrations of corrosion inhibitors are prepared,and different coating treatments are respectively performed on the metal plate,and the control group experiment is carried out on the salt solution and the aqueous solution.To explore the protective ability of polylactic acid microcavity array loaded corrosion inhibitor coating on metal.Studies have shown that the load of corrosion inhibitor 2-mercaptobenzothiazole 50 mg/ml polylactic acid microcavity array coating has the best corrosion protection effect on metal plates.In summary,the use of micro-contact printing technology,one-step dip coating process and other methods to prepare polylactic acid microcavity array load corrosion inhibitor is an effective anticorrosion method for metal protection.It also is simple,fast,low cost,flexible and easy to operate and so on.The acidity response release method provides an important foundation for the development of new metal protective coatings based on polylactic acid microcavity arrays.