Process for preparing polyurethane anti-corrosion agent and using method for anti-corrosion pipe, steel plate and ground

Abstract

The polyurethane preservative is prepared through the first reaction between linear diol polyester and isohydrogen acid to form the intermediate with NTO end radical and the subsequent reaction with amino compound. The present invention has extremely high wear resistance, 6-10 times that of rubber, and may be used to replace rubber and plastic in many application fields to raise the endurance of parts. It may be used in preservation of gas pipeline and oil pipeline, and has long service life, simple technological process and low cost.

Description

technical field [0001] The invention belongs to the technical field of preparation and application of anticorrosion materials. Background technique [0002] The current domestic anticorrosion status of gas and oil pipelines: [0003] As we all know, gas and crude oil contain a certain amount of sulfides (such as hydrogen sulfide, mercaptans, sulfides, etc.), nitrogen compounds, acids and alkalis and other corrosive media, which often cause serious corrosion and dirt on the surface of gas pipelines and oil pipelines , Cause gas and crude oil leakage over time, so it needs to be replaced in extreme cases. Gas pipes and oil pipelines are spread all over cities and oil fields, and their maintenance and replacement costs and production stop loss are very huge. For this reason, gas and petroleum technicians and maintenance personnel have been working hard to find anti-corrosion methods for various pipelines for many years to minimize gas and oil pipelines. The cost of maintenanc...

AI Technical Summary

Problems solved by technology

[0003] As we all know, gas and crude oil contain a certain amount of sulfides (such as hydrogen sulfide, mercaptans, sulfides, etc.), nitrogen compounds, acids and alkalis and other corrosive media, which often cause serious corrosion and dirt on the surface of gas pipelines and oil pipelines , causing gas and crude oil leakage over time, so it needs to be replaced very often

Gas pipes and oil pipelines are spread all over cities and oil fields, and their maintenance and replacement costs and production stop loss are very huge. For this reason, gas and petroleum technicians and maintenance personnel have been working hard to find anti-corrosion methods for various pipelines for many years to minimize gas and oil pipelines. The cost of maintenance and replacement, among which the more common method is to use nickel phosphating plating on the inner and outer surfaces of the pipe and the method of stainless steel inside and outside the pipe, such as the current outer jacket plastic pipe and other measures, which play a certain role in the anti-corrosion of the pipe, but there are still some many shortcomings

[0004] It is unavoidable that there are pores in the nickel phosphating coating, and the pores cause the weak link of corrosion. Therefore, the pipes using phosphating plating will also corrode in the pores after a period of use.

[0005] Adding stainless steel lining anti-corrosion measures to oil pipelines and gas pipelines with plastic anti-corrosion measures also have the following disadvantages: stainless steel materials are expensive and costly, and the method of expanding the tube to stick to the inner wall of the oil pipeline and the method of sheathing plastics has low bonding strength and poor reliability.

Welding, tube expansion and inspection of welding conditions are complicated, and equipment investment is large

The anti-corrosion of the joint between the pipe and the pipe is difficult to deal with, and it often becomes a corrosion-prone part

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