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Nanometer solvent-free epoxy anticorrosive paint and preparation method thereof

An epoxy anti-corrosion coating, solvent-free technology, applied in anti-corrosion coatings, epoxy resin coatings, anti-fouling/underwater coatings, etc., can solve the health impact of environmental construction personnel, no antibacterial and bactericidal effects, and limited anti-corrosion effects, etc. Problems, achieve the effect of improving anti-corrosion ability, prolonging the validity period, and low impact resistance

Active Publication Date: 2020-05-01
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The organic coating anti-corrosion technology is simple to implement, low in cost, does not require post-maintenance, and does not need to change the well structure and completion method of the oil well. It is technically feasible to apply it to casing anti-corrosion. Anti-corrosion ability to prolong the service life of the casing, generally with the internal anti-corrosion technology of adding corrosion inhibitors, but these two anti-corrosion technologies have certain limitations in practical applications, such as the quality of water produced inside the casing due to complex formations and corrosive dissolved gases will cause corrosion to the casing, especially when the produced water contains corrosive microorganisms such as sulfate-reducing bacteria
Modified epoxy-phenolic coatings commonly used in oil fields have no antibacterial and bactericidal effects, and the anti-corrosion effect is limited
Among them, the disadvantage of using corrosion inhibitors to control the corrosion of oil casings is mainly frequent filling, and the filling amount needs to be matched with corrosive media such as produced fluid to ensure a reasonable filling concentration
There are labor protection and equipment maintenance requirements for manual filling or automatic filling by dosing device
[0004] Although conventionally used solvent-based epoxy coatings can improve the anti-corrosion ability of organic coating anti-corrosion technology, a certain amount of VOC will be emitted during the drying process of the coating film, which will have a certain degree of impact on the environment and the health of construction personnel.

Method used

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  • Nanometer solvent-free epoxy anticorrosive paint and preparation method thereof
  • Nanometer solvent-free epoxy anticorrosive paint and preparation method thereof
  • Nanometer solvent-free epoxy anticorrosive paint and preparation method thereof

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preparation example Construction

[0036] The preparation method of corrosion inhibitor microcapsules comprises the following steps,

[0037]Step 1, at room temperature, add 0.05 to 0.2 parts of ethyl cellulose to the toluene-ethanol dispersion, so that the ethoxy content is 45% to 55%, the viscosity is 15 to 30mPa.s, and the ethyl cellulose Contains ethoxy groups, limiting the content and viscosity of ethoxy groups is to control the subsequent reaction. The toluene-ethanol dispersion can be directly mixed with toluene and ethanol, and their volume ratio does not need to be limited;

[0038] Step 2: Add 3-8g of sodium nitrite to the dispersion obtained in step 1 for reaction, then add 12-18g of polybutadiene, and stir at room temperature for 30-60 minutes;

[0039] Step 3, adding 8 to 12 g of toluene diisocyanate to the mixed system obtained in step 2 to obtain a water-insoluble mixture containing ethyl cellulose;

[0040] Step 4, putting the obtained ethylcellulose-containing mixture into an oven for drying ...

Embodiment 1

[0053] The manufacture method step of nano solvent-free epoxy anticorrosion paint of the present invention is as follows, wherein the ratio of each component is parts by weight,

[0054] Step 1, put the novolac epoxy resin into a 40°C oven for 5 hours to preheat;

[0055] Step 2, put 0.6 parts of barium sulfate, 0.2 parts of talc powder, 0.25 parts of wollastonite powder, 0.3 parts of mica powder and 0.003 parts of fumed silica in a thermostat at 150°C for 12 hours to remove water and obtain pigments and fillers;

[0056] Step 3, mix 1 part of polyether modified epoxy resin, 0.8 part of novolak epoxy resin, 0.02 part of defoamer, 0.015 part of dispersant, 0.015 part of leveling agent and stir at room temperature, stirring at 40 ° C Add 1.35 parts of pigments and fillers, 0.05 parts of nano-TiO 2 , continue to stir at a speed of 1000rpm for 35min to disperse the components evenly, then use a grinder to grind for 0.8 hours, and finally add 0.005 parts of corrosion inhibitor ca...

Embodiment 2

[0071] The manufacture method step of nano solvent-free epoxy anticorrosion paint of the present invention is as follows, wherein the ratio of each component is parts by weight,

[0072] Step 1, put the novolac epoxy resin into a 40°C oven for 5 hours to preheat;

[0073] Step 2, put 0.7 parts of barium sulfate, 0.3 parts of talc powder, 0.25 parts of wollastonite powder, 0.4 parts of mica powder and 0.004 parts of fumed silica in a thermostat at 150°C for 12 hours to remove water and obtain pigments and fillers;

[0074] Step 3, mix 1 part of polyether modified epoxy resin, 0.9 part of novolak epoxy resin, 0.0254 part of defoamer, 0.0178 part of dispersant, 0.018 part of leveling agent and stir at room temperature, stirring at 45 ° C Add 1.8 parts of pigments and fillers, 0.075 parts of nano-TiO 2 , continue to stir at a speed of 2000rpm for 35min to disperse the components evenly, then grind for 1 hour with a grinder, and finally add 0.005 parts of corrosion inhibitor caps...

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Abstract

The invention relates to a nanometer solvent-free epoxy anticorrosive paint and a preparation method thereof. The paint comprises a first component and a second component in a weight ratio of 1: (0.1-0.3). The first component comprises 1 part of polyether modified epoxy resin, 0.8 to 1 part of novolac epoxy resin, 0.05 to 0.1 part of nanometer TiO2, 0.005 to 0.01 part of a corrosion inhibitor, 1.35 to 2.0 parts of a pigment and filler, 0.02 to 0.03 part of an antifoaming agent, 0.01 to 0.02 part of a dispersant and 0.01 to 0.02 part of a leveling agent. The second component comprises an epoxycuring agent. The method comprises the following steps: uniformly mixing the novolac epoxy resin, the polyether modified epoxy resin, the antifoaming agent, the dispersant and the leveling agent, adding the nanometer TiO2 and the pigment and filler, carrying out uniform mixing, adding the corrosion inhibitor, conducting uniform dispersing, and uniformly mixing the first component and the second component according to a weight ratio of 1: (0.1-0.3) to obtain the nanometer solvent-free epoxy anticorrosive paint.

Description

technical field [0001] The invention belongs to the technical field of anti-corrosion coatings, in particular to a nano-solvent-free epoxy anti-corrosion coating and a preparation method thereof. Background technique [0002] Oil wells in low-permeability oilfields have the characteristics of low single well production and long development cycle. The corresponding oil and water well casings need to be mainly made of carbon steel, and economical and practical anti-corrosion technologies are used. Such anti-corrosion technologies mainly include impressed current cathodic protection, Anti-corrosion technologies such as injection of chemical corrosion inhibitors, organic coatings and inorganic coatings, among which organic coating anti-corrosion technology is more commonly used. [0003] The organic coating anti-corrosion technology is simple to implement, low in cost, does not require post-maintenance, and does not need to change the well structure and completion method of the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D163/00C09D163/04C09D5/08C09D5/14C09D5/16C09D7/61C09D7/47C09D7/65C09D7/45C09D7/80C08G59/56C08G59/62
CPCC08G59/56C08G59/62C08K2003/2241C08K2003/3045C08K2201/011C08L2205/02C08L2205/035C09D5/08C09D5/14C09D5/1618C09D5/1687C09D163/00C09D163/04C09D7/80C08L63/04C08L83/04C08L71/02C08L1/28C08L33/04C08K3/00C08K3/22C08K3/30C08K3/34C08K3/36C08L63/00
Inventor 李琼玮周志平谷成义姜毅董俊孙雨来付彩利戚建晶刘锐张国庆
Owner PETROCHINA CO LTD
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