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Solvent-free polyurethane joint coating anticorrosive paint for pipelines

A solvent-free polyurethane and anti-corrosion coating technology, applied in polyurea/polyurethane coatings, anti-corrosion coatings, coatings, etc., can solve the problems of difficult cathodic stripping resistance and low reactivity of polyurethane joint coatings, and achieve good durability Cathodic stripping performance and hot water resistance adhesion performance, excellent performance, effect of reducing requirements

Active Publication Date: 2013-10-30
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] (2) The reactivity of the secondary hydroxyl group is lower than that of the primary hydroxyl group and the isocyanate component. Therefore, to achieve a rapid curing effect, it is necessary to add a considerable proportion of a curing accelerator that promotes the reaction between the secondary hydroxyl group and the isocyanate
Therefore, using the current polypropylene oxide polyols, it is difficult for the cathodic disbonding resistance of polyurethane sealing coatings to reach a level equivalent to that of epoxy sealing coatings.

Method used

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  • Solvent-free polyurethane joint coating anticorrosive paint for pipelines
  • Solvent-free polyurethane joint coating anticorrosive paint for pipelines
  • Solvent-free polyurethane joint coating anticorrosive paint for pipelines

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1. This example consists of A component and B component. The ratio of component A is: in 100% by weight, polyols with an average equivalent weight of 240 account for 24%, polyols with an average equivalent weight of 800 account for 16%, dispersants account for 0.5%, defoamers account for 0.5%, and Water agent accounts for 5%, dustproof agent accounts for 0.5%, coupling agent accounts for 0.5%, ammonia accelerator accounts for 0.8%, antirust pigment zinc phosphate accounts for 15%, titanium dioxide accounts for 8%, mica powder accounts for 11%, sulfuric acid Barium accounted for 18.2%;

[0026] The curing agent of component B (Bayer Desmodur VL curing agent) accounts for 25% of the total weight of component A.

[0027] The performance test results of the materials are shown in Table 2:

[0028] Table 2 Performance test results of solvent-free polyurethane coatings

[0029]

Embodiment 2

[0030] Example 2. This example consists of A component and B component.

[0031] The proportion of component A is that in 100% by weight, polyols with an average equivalent weight of 300 account for 30%, polyols with an average equivalent weight of 1200 account for 12%, dispersants account for 0.3%, defoamers account for 0.8%, and Water agent accounts for 3%, dustproof agent accounts for 0.7%, coupling agent accounts for 0.6%, ammonia accelerator accounts for 0.8%, antirust pigment zinc phosphate accounts for 13%, titanium dioxide accounts for 8%, mica powder accounts for 14%, sulfuric acid Barium accounted for 16.8%;

[0032] The curing agent of component B (Bayer Desmodur VL curing agent) accounted for 28% of the total weight of component A.

[0033] The performance test results of the materials are shown in Table 3:

[0034] Table 3 Performance test results of solvent-free polyurethane coatings

[0035]

[0036]

[0037] After several tests in this example, the coa...

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Abstract

The invention provides solvent-free polyurethane joint coating anticorrosive paint for metal pipelines, relating to the technical field of general corrosion prevention of metal materials and pipeline systems. The solvent-free polyurethane joint coating anticorrosive paint comprises a component A and a component B, wherein the component A contains a hydroxyl component with the average equivalent weight in the range from 200 to 2000, the hydroxyl component takes bisphenol A as a starting agent and contains a polyethylene oxide addition product with a molecular structure shown in descriptions, in the molecular structure, a and b are identical or different integers in the range from 1 to 20, and the component B is polyisocyanate. The solvent-free polyurethane joint coating anticorrosive paint has low water absorption and high reaction activity; a film forming matter has excellent cathodic disbonding resistance and hot water adhesive force resistance.

Description

technical field [0001] The invention relates to a solvent-free polyurethane joint anticorrosion coating for metal pipelines, and relates to the technical fields of general anticorrosion of metal materials and pipeline systems. Background technique [0002] At present, most of the anti-corrosion layers of main and branch lines of oil and gas pipelines use 3 layers of PE anti-corrosion layers. Among the existing various joint materials, the basic types suitable for 3PE anti-corrosion pipeline joints include the following four types: (1) heat shrinkable polyethylene Anti-corrosion products; (2) Two-component solvent-free epoxy coating; (3) Two-component solvent-free polyurethane coating; (4) Cold wrapping and hot anticorrosion wrapping tape. [0003] Due to concerns about the use effect and limited by factors such as product technology and operating equipment conditions, heat-shrinkable polyethylene is still the main material for the 3-layer PE anti-corrosion joint of the trunk...

Claims

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Application Information

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IPC IPC(8): C09D175/08C09D5/08C08G18/76C08G18/48
Inventor 李建忠李会王兆坤谢涛施羽王颖王成强
Owner BC P INC CHINA NAT PETROLEUM CORP
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