Fusion bonded epoxy coating compositions that include magnesium oxide

A technology for epoxy coatings and compositions, applied in epoxy coatings, powder coatings, coatings, etc., can solve problems such as cracks and defects in pipeline coatings, achieve excellent resistance to cathodic disbondment, and improve adhesion. sexual effect

Inactive Publication Date: 2012-01-11
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] While making the pipe structure cathodic will generally reduce corrosion, fractures and defects in pipe coatings are problematic

Method used

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  • Fusion bonded epoxy coating compositions that include magnesium oxide
  • Fusion bonded epoxy coating compositions that include magnesium oxide
  • Fusion bonded epoxy coating compositions that include magnesium oxide

Examples

Experimental program
Comparison scheme
Effect test

example

[0080] All parts, percentages, ratios, etc. in the examples, as well as elsewhere herein, are by weight unless otherwise indicated.

[0081] materials used

[0082] Amicure CG-1400: Dicyanamide curing agent available from Air Products and Chemical, Inc., Allentown, PA.

[0083] Catechol Novolak Blend - A 20:80 blend of catechol novolac resin and phenolic hardener resin, which is equivalent to the "ACN blend" described in US Patent No. 6,911,512.

[0084] Curezol C-17Z: Accelerator, available from Shikoku Chemicals Corp., Tokushima, Japan.

[0085] DER 6508: Isocyanate-modified epoxy resin available from Dow Chemical Corporation, Freeport, TX.

[0086] Dyhard 100M: Dicyanamide curing agent available from AlsChem LLC, Atlanta, GA.

[0087] EPI-CURE P100: Accelerator available from Hexion Specialty Chemicals, Columbus, OH.

[0088] EPON 2004 and EPON 1001F: epoxy resins available from Hexion Specialty Chemicals, Columbus, OH.

[0089] ExBar W 400: barium sulfate, available...

example 1 and 2 and comparative example A

[0135] Examples 1 and 2 are powdery epoxy compositions prepared according to an exemplary embodiment of the present invention, which respectively have EPON 2004, EPON 1001F, Dyhard 100M, EPI-CURE P100, SMC 1108, phthalein as provided in Table 1 Component concentrations of Cyan Green Lake, Resiflow PF67, Catechol Novolak Blend, MPP 620F, Vansil W20, and Polycal OS 325 or Maglite A. Comparative example A is the composition of comparison, and it has EPON 2004, EPON 1004F, Dyhard 100M, EPI-CURE P100, SMC 1108, phthalocyanine green lake, Resiflow PF67, catechol novolac blending as provided in Table 1 products, MPP 620F and Vansil W20. The amounts shown in Table 1 are given in both relative parts by weight (parts per 100 parts by weight resin, phr) and percent by weight (wt%) of the coating composition.

[0136] Table 1

[0137]

[0138] Table 2 shows the results of the coated steel panel samples in the hot water adhesion test and cathodic disbondment test. Example 1 strongl...

Embodiment 3 and 4 and comparative example B

[0142] Examples 3 and 4 are powdery epoxy compositions prepared according to an exemplary embodiment of the present invention, which have DER 6508, EPON 2004, Amicure CG-1400, Curezol C-17Z, SMC 1108, Component concentrations of Phthalocyanine Green Lake, Resiflow PF67, Catechol Novolak Blend, ExBAR 400, Vansil W20 and Maglite A. Comparative Example B is a comparative composition, which has DER 6508, EPON 2004, CG-1400, Curezol C-17Z, SMC 1108, phthalocyanine green lake, Resiflow PF67, catechol novolac co- Blend, ExBAR 400 and Vansil W20. The amounts shown in Table 3 are given in both relative parts by weight (parts per 100 parts by weight resin, phr) and percent by weight (wt%) of the coating composition.

[0143] table 3

[0144]

[0145]

[0146] Table 4 shows the results of the coated steel panel samples in the hot water adhesion test and cathodic disbondment test. Note that for the hot water adhesion test, two separate scoring results are reported for each exam...

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Abstract

A powdered epoxy coating composition for coating a substrate. The coating composition comprises: (a) from about 50 wt% to about 90 wt% of at least one epoxy resin; (b) from about 1 wt% to about 30 wt% of at least one catechol novolak-type adhesion promoter; and (c) from about 0.1 wt% to about 5 wt% of magnesium oxide. The coating may also include from about 10 wt% to about 48 wt% of an inorganic filler. The coating composition provides improved adhesion at high temperature operating conditions and improved resistance to damage by cathodic disbondment for pipe, rebar, and other substrates.

Description

Background technique [0001] The present invention relates generally to coatings for the protection of metal articles, and more particularly to fusion-bonding epoxy coatings for pipelines intended for underwater offshore use, aboveground use, or buried implantation. [0002] Various protective pipe coatings are known in the art. Additionally, federal regulations require cathodic protection of main piping to reduce failures due to corrosion. Cathodic protection is defined as the reduction or elimination of corrosion by making a metal cathodic by the application of direct current or connection to a sacrificial anode, usually magnesium, aluminum or zinc. [0003] While making the pipe structure cathodic will generally reduce corrosion, fractures and defects in pipe coatings are problematic. Initially, these breaks or "holidays" are protected by a negative charge, but over time, and aided in part by moisture and minerals in the soil and in some cases by hot pipe contents, this ne...

Claims

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Application Information

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IPC IPC(8): C09D163/00C08K3/22C09D5/03C09D7/61
CPCC09D5/033C09D5/1662C09D7/1216C09D163/00C08K3/22C08L61/04C08L61/12C09D7/61Y10T428/31511C08L2666/16C08L2666/54
Inventor 马克·A·史密斯
Owner 3M INNOVATIVE PROPERTIES CO
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