Benzyltriphenylphosphonium bistrifluoromethanesulfonimide ionic liquid, synthesis method and application as metal corrosion inhibitor
A benzyltriphenylphosphonium bistrifluoromethane and ionic liquid technology, which is applied in the field of ionic liquids, can solve the problems of poor corrosion resistance, low corrosion inhibition efficiency, and application constraints of magnesium alloys, and achieve improved adsorption capacity and simple post-treatment , the effect of simple preparation method
Active Publication Date: 2020-08-04
HENAN UNIVERSITY
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Problems solved by technology
However, the corrosion resistance of magnesium alloys is very poor, and severe corrosion will occur without protection in industrial atmospheres and marine atmospheric environments, which severely restricts its application.
In recent years, with the development of magnesium alloy application research, the research on the corrosion protection of magnesium alloy has also received extensive attention. A variety of inorganic and organic corrosion inhibitor materials have been developed, but currently they are commonly used as corrosion inhibitors for magnesium alloys. Strong toxicity, environmental pollution, low corrosion inhibition efficiency and other problems, so the development of environmentally friendly, high corrosion inhibition efficiency, safe and stable corrosion inhibitors for magnesium alloys is still a hot spot for researchers
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Embodiment 1
[0022] Benzyltriphenylphosphonium bistrifluoromethanesulfonimide ([BPP] + [NTf 2 ] - ) ionic liquid, its molecular structure is as follows:
[0023] .
[0024] The synthetic method of above-mentioned benzyltriphenylphosphonium bistrifluoromethanesulfonimide ionic liquid specifically comprises the following steps:
[0025] 1) Add 2.62 g (0.01 mol) of triphenylphosphine and 1.26 g (0.01 mol) of benzyl chloride into a three-necked flask, and react at 100 °C for 24 h under nitrogen protection. After the reaction, it was naturally cooled to room temperature, and the solid product was obtained quantitatively, with a yield close to 100%, which was directly used in the next reaction without further purification. MS (ESI): m / z 353.19 [BPP] + ;
[0026] 2) Take 0.6 g of the solid product obtained in step 1) in a single-necked flask, then add 0.45 g of lithium bistrifluoromethanesulfonimide, and 20 mL of methanol, and stir for 3~4 h under normal temperature and pressure condition...
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The invention discloses benzyl triphenyl-phosphonium difluoromethane sulfonymide ([BPP]<+>[NTf2]<->)ionic liquid, wherein the structural formula is as follows: (the formula is as shown in the description). The invention further discloses a synthesis method of the ionic liquid as well as application of the ionic liquid as a metal corrosion inhibitor. According to the method, triphenylphosphine andbenzyl chloride are subjected to a combination reaction to synthesize benzyl triphenyl phosphonium chloride, and the [BPP]<+>[NTf2]<-> is obtained through anion exchange reaction. The problem of corrosion of metal magnesium and alloy thereof is solved, and the corrosion prevention efficiency of the ionic liquid is about 91.21 percent. The advantages of simple synthesis process, mild reaction condition, simple after treatment and the like are achieved; the yield of the prepared benzyl triphenyl-phosphonium difluoromethane sulfonymide can reach 92 percent or higher.
Description
technical field [0001] The invention belongs to the technical field of ionic liquids, and in particular relates to a benzyltriphenylphosphonium bistrifluoromethanesulfonimide ionic liquid, a synthesis method and its application as a metal corrosion inhibitor (especially a metal magnesium corrosion inhibitor). Background technique [0002] As mankind enters the 21st century, the sustainable development strategy has become the consensus of all countries in the world. The sustainable development of today's society is facing three major problems: population expansion, resource shortage, and environmental degradation. Corrosion is an important destructive factor in modern industry and life. It is estimated that the direct economic loss caused by corrosion accounts for about 1-5% of the gross national product, and the addition of corrosion inhibitors is a corrosion control method with strong applicability. Its use can effectively inhibit metal corrosion and protect resources, Pl...
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IPC IPC(8): C07F9/54C07C303/40C07C311/48C23F11/167
CPCC07C303/40C07C311/48C07F9/5442C23F11/167
Inventor 王丽任铁钢张敬来苏慧双刘月
Owner HENAN UNIVERSITY