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Study on Preparation and Anticorrosion Properties of Poly(2,3-dimethyllaniline)/Epoxy Coating

Author: LiuMaoXi
Tutor: MaLi
School: Chongqing University
Course: Chemical Engineering
Keywords: Polyaniline Poly(2,3-dimethylaniline) Epoxy resin Anticorrosive coating
CLC: TQ637
Type: Master's thesis
Year: 2013
Downloads: 91
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Abstract


The corrosion and protection of metals has become one of the most seriousproblems which has to face up with during the construction of industrial modernization.Financial loss caused by metallic corrosion in developed centuries has reached up to700billion dollars every year, which occupied2~4%of Gross National Product (GNP) andhas been six times of that caused by natural disasters, such as earthquake,flood,hurricane and so on. The annual financial loss caused by metallic corrosion in ourcountry is at least20billion RMB. As the quality of life improves, the aestheticperception of many people has been changed gradually. More and more requirements onlarge-scale steel constructions are increased, along with the metallic corrosion andprotection.Zinc-rich epoxy coatings is one of the most widely used anticorrosive coatingsbecause of its early development and good anticorrosive property. However, it canreleases zinc oxide soot dust during metallic hot-working processes, such as incisionand welding, which is immensely harmful for human health and cause zinc fever, evenbring about environment pollution.As a new kind of functional polymer material, polyaniline(PANI) has attractedmuch attention among researchers in the world due to its simple synthesis, particulardoping-dedoping mechanism, good redox property and environmental stability, highelectrical conductivity, as well as distinctive electrical, optical and magnetic properties.However, the big rigid of its chain backbone and strong intermolecular interactionrestrict its solubility and melt, which further hinder its applications in many fields.Researches on PANI derivatives found that the rigidity of PANI molecular andinteractions between PANI chains were reduced due to the reducing coplanarity whenhydrogen atoms were substituted by electron-donating groups, such as methyl group,methoxyl group, oxyethyl group, and so on. Therefore, ring-substituted PANI usuallyhas better solubility and dispersibility than PANI, which make it as a good anticorrosiveadditive widely used in anticorrosive paints.As one of ring-substituted PANI derivatives, poly(2,3-dimethylaniline)(P(2,3-DMA)) has better anticorrosive property than PANI. This work is based on thepoly(2,3-dimethylaniline) prepared previously and focus on its application in epoxyanticorrosive coatings. When the content of P(2,3-DMA) used in epoxy anticorrosive coatings reached3%, the P(2,3-DMA)/epoxy paints with highest anticorrosive propertywere obtained. The social effect and economic benefit of the P(2,3-DMA)/epoxyanticorrosive coatings compared to that of zinc-rich epoxy coatings were analyzed.

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CLC: > Industrial Technology > Chemical Industry > Paint Industry > Special paints
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