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Polyurea external corrosion prevention paint for pipe line and its manufacturing method

A technology for anti-corrosion coatings and manufacturing methods, which is applied in the direction of anti-corrosion coatings, polyurea/polyurethane coatings, coatings, etc., and can solve the problems of affecting the service life of anti-corrosion coatings, poor coating resistance to cathodic disbonding, and low coating shear strength. problems, to achieve the effect of easy quality control, excellent shear strength, and improved service life

Active Publication Date: 2007-02-14
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Existing polyurea external anti-corrosion coatings for pipelines are made of polyisocyanate and its polyether polyamine curing agent, plus certain additives and pigments and fillers. The disadvantage is that the shear strength of the coating is low , only 10MPa, the coating resistance to cathodic disbonding is not good, which directly affects the service life of the anti-corrosion layer

Method used

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Embodiment Construction

[0013] The invention discloses a manufacturing method of a polyurea external anticorrosion coating for pipelines. Add 1 weight part of diphenylmethane diisocyanate and 0.3 weight part of carbodiimidized diisocyanate into the reaction kettle, stir evenly and heat to 85°C, then slowly add 0.6 weight part of polyether dropwise under stirring Dibasic alcohol and 0.1 weight part of polyether trihydric alcohol, insulated and stirred for 4 hours can be made into liquid A in the coating; add 1 weight part of amino-terminated polyoxyethylene ether and 0.4 weight part of dimethyl sulfide in a stainless steel bucket Diethyltoluenediamine, 0.3 parts by weight of diethyltoluenediamine, stir and mix evenly, add 0.003 parts by weight of isopropyl titanate solution, 0.002 parts by weight of polyacrylate solution, 0.05 parts by weight of carbon Black, 0.08 parts by weight of titanium dioxide and 0.2 parts by weight of light calcium carbonate, stirred at high speed for 0.5h, then ground with a ...

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PUM

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Abstract

The invention relates to a pipeline polyurea outer anticorrosive coating and the making method thereof, making heated prepolymerization reaction on dibenzo-methane diisocyanate, carbodiimide diisocyanate, polyether binary alcohol and polyether trihydric alcohol to prepare prepolymer solution A, and making end amino polyethylene oxide ether, dimethyl sulfur-based toluene diamine, diethyl diamine, iso-propyl titanate solution, polyacrylate, carbon black, titanium dioxide and lightweight calcium carbonate into solution B, and as using, respectively heating the solutions A and B to 65 deg.C and then mixing them, then quickly spraying and curing to form a coat. And it has excellent constructional performance, and high curing speed, and the formed coat has excellent shearing performance, cathode peeling resistance, wearability, shock resistance and corrosion resistance. And it can be used in pipeline outer anticorrosive engineering, able to resist corrosion of corrosive media to pipelines and prolong pipeline service life.

Description

technical field [0001] The invention relates to a polyurea external anti-corrosion coating for pipelines and a manufacturing method, which are suitable for anti-corrosion of the outer walls of steel transmission pipelines. technical background [0002] Existing polyurea external anti-corrosion coatings for pipelines are formulated with polyisocyanate and polyether polyamine curing agents, plus certain additives and pigments and fillers. The disadvantage is that the coating shear strength is low , only 10MPa, the coating resistance to cathodic disbonding is not good, which directly affects the service life of the anti-corrosion layer. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a coating with convenient construction, fast curing speed, excellent shear resistance, cathodic disbonding resistance, wear resistance, A polyurea external anti-corrosion coating for pipelines with impact resistance and anti-corrosion ...

Claims

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Application Information

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IPC IPC(8): C09D175/02C09D5/08
Inventor 林竹张其滨张莉范云鹏徐翠竹郭晓军
Owner BC P INC CHINA NAT PETROLEUM CORP
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