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: 2009-07-15
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Abstract
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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] Manufacturing method of polyurea exterior anticorrosive coating for pipeline. Add 1 part by weight of diphenylmethane diisocyanate and 0.3 part by weight of carbodiimide diisocyanate into the reactor, stir evenly and heat to 85°C, and then slowly add 0.6 parts by weight of polyether while stirring. Dihydric alcohol and 0.1 parts by weight of polyether triol, heat preservation and stirring for 4 hours to prepare liquid A in the coating; add 1 part by weight of amino-terminated polyoxyethylene ether and 0.4 parts by weight of dimethyl sulfide into the stainless steel tank Diethyl toluene diamine, 0.3 parts by weight of diethyl toluene diamine, stir and mix uniformly, add 0.003 parts by weight of isopropyl titanate solution, 0.002 parts by weight of polyacrylate solution, and 0.05 parts by weight of carbon under stirring. Black, 0.08 parts by weight of titanium dioxide and 0.2 parts by weight of light calcium carbonate, stir at high speed for 0.5h, and then grind with a sand m...

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Abstract

The invention relates to a polyurea external anti-corrosion coating for pipelines and a manufacturing method thereof, which is prepared by heating and prepolymerizing diphenylmethane diisocyanate, carbodiimidized diisocyanate, polyether diol and polyether triol. Polymer liquid A, composed of amino-terminated polyoxyethylene ether, dimethylthiotoluenediamine, diethyltoluenediamine, isopropyl titanate solution, polyacrylate solution, carbon black, titanium dioxide and light carbonic acid Calcium-based Liquid B is composed of Liquid A and Liquid B, which are heated to 65°C and mixed, and then quickly sprayed and solidified to form a coating. The coating has excellent construction performance and fast curing speed, and the coating has excellent shear performance, cathodic stripping resistance, abrasion resistance, impact resistance and corrosion resistance. It can be used in the external anti-corrosion project of the pipeline, which can resist the corrosion of the pipeline by the corrosive medium and improve the service life of the pipeline.

Description

Technical field [0001] The invention relates to a polyurea external anticorrosive paint for pipelines and a manufacturing method, which is suitable for the anticorrosion of the outer wall of steel conveying pipelines. technical background [0002] The existing polyurea exterior anticorrosive coatings for pipelines are made of polyisocyanate and its polyether polyamine curing agent, plus certain additives and pigments. The disadvantage is that the coating has low shear strength. , It is only 10MPa, and the coating has poor cathodic disbonding resistance, which directly affects the service life of the anticorrosion layer. Summary of the invention [0003] The technical problem to be solved by the present invention: in order to avoid the above-mentioned shortcomings in the prior art, it provides a convenient construction, fast curing speed, and its coating has excellent shear resistance, cathodic peel resistance, wear resistance, Polyurea external anticorrosive coating for pipeline...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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