1、SSPC-Paint 16November 1, 2006Reaffirmed with editorial revisions June 15, 201511. ScopeThis standard covers a two-component coal tar epoxy polyamide black (or dark red) coating for structural steel. 2. Description2.1 The coal tar epoxy-polyamide black (or dark red) coating consists of two parts. Com
2、ponent A contains a refined coal tar pitch, a liquid-type polyamide resin, and a polyamine promoter to accelerate curing rate. Component B is a liquid-type epoxy resin that is mixed into Component A just prior to application. Details of the composition are given in Table 1.2.2 This coating contains
3、approximately 71 percent by volume (vol. %) of nonvolatile film-forming solids (pigment and binder). The theoretical spreading rate for a 200-micrometer m (8 mil) dry film thickness is 3.5 square meters/liter (142 square feet/U.S. gallon). Actual spreading rates can be signifi-cantly lower.2.3 This
4、coating is suitable for exposures in SSPC Environmental Zones 2A (frequently wet by fresh water), 2B (frequently wet by salt water), 2C (fresh water immersion), 2D (salt water immersion), 3A (chemical, acidic), 3B (chemical, neutral), and 3C (chemical, alkaline); and is intended for spray applicatio
5、n over steel surfaces prepared in accordance with SSPC-SP 6, “Commercial Blast Cleaning” (for non-immersion service), SSPC-SP 10, “Near White Blast Cleaning” (for immersion service), or SSPC-SP 8, “Pickling.” The coating is self-priming and exhibits good adhesion to clean structural steel and concre
6、te surfaces. Adhesion of the coating to smooth surfaces such as cold-rolled steel or intact mill scale has been found to be substantially inferior to that attained on blast roughened surfaces (see Note 8.1).3. Referenced Standards3.1 The latest issue, revision, or amendment of the refer-enced standa
7、rds in effect on the date of invitation to bid shall govern, unless otherwise specified. Standards marked with an asterisk (*) are referenced only in the Notes, which are not requirements of this specification.3.2 If there is a conflict between the requirements of any of the cited referenced standar
8、ds and this specification, the requirements of this specification shall prevail.3.3 SSPC STANDARDS AND JOINT STANDARDS:Guide 13 Guide for the Identification and Use of Industrial Coating Material in Computerized Product DatabasesPA 1 Shop, Field, and Maintenance Painting of SteelPA 2 Procedure for D
9、etermining Confor-mance to Dry Coating Thickness RequirementsSP 6/NACE No. 3 Commercial Blast CleaningSP 8 PicklingSP 10/NACE No. 2 Near-White Blast Cleaning3.4 ASTM INTERNATIONAL STANDARDS:1D4 Standard Test Method for Bitumen ContentD5/D5M Standard Test Method for Penetration of Bituminous Material
10、sD36/D36M Standard Test Method for Softening Point of Bitumen (Ring-and-Ball Apparatus)D139 Standard Test Method for Float Test for Bituminous MaterialsD605 Standard Specification for Magnesium Silicate Pigment (Talc)D609 Standard Practice for Preparation of Cold-Rolled Steel Panels for Testing Pain
11、t, Varnish, Conversion Coatings, and Related Coating ProductsD1296 Standard Test Method for Odor of Volatile Solvents and DiluentsD1475 Standard Test Method for Density of Liquid Coatings, Inks, and Related ProductsD1544 Standard Test Method for Color of Transparent Liquids (Gardner Color Scale)D165
12、2 Standard Test Methods for Epoxy Content of Epoxy ResinsD2415 Standard Test Method for Ash in Coal Tar and PitchD3721 Standard Specification for Synthetic Red Iron Oxide Pigment1 ASTM International, 100 Barr Harbor Road, West Conshohocken PA, 19248.Standards are available online from SSPC: The Soci
13、ety for Protective CoatingsCoating Standard No. 16Coal Tar Epoxy Polyamide, Black (or Dark Red) CoatingSSPC-Paint 16November 1, 2006Reaffirmed with editorial revisions June 15, 201523.5 FEDERAL STANDARDS:* MIL-PRF-23236 Coating Systems for Ship Structures23.6 UNITED NATIONS STANDARD3GHS Globally Har
14、monized System of Classification and Labelling of Chemicals (GHS), 4th Revised Edition.4. Composition4.1 Ingredients and proportions shall be as specified in Table 1 and in Sections 4.3 through 4.7 (see Notes 8.2 and 8.3).4.2 Each component of this coating based on the specified ingredients shall be
15、 uniform, stable in storage, and free from grit and coarse particles.2 US Department of Defense Single Stock Point (DODSSP) military standards are available online via 3 United Nations Economic Commission for Europe, Transport Division, Palais des Nations, CH - 1211 Geneva 10, Switzerland. Copies of
16、 this standard may be obtained from the United Nations Publications Customer Service, National Book Network, 15200, 15200 NBN Way, Ridge Summit PA 17124 4.3 Coal tar pitch used in this coating is defined as a product obtained from the distillation of high temperature crude coke oven tar, which in it
17、self is a product obtained during the destructive distillation of coal in slot ovens operated at a temperature above 700 C (1300 F). The coal tar pitch shall be composed primarily of a complex combination of three or more membered condensed ring aromatic hydrocarbons.4.4 The epoxy resin shall be a d
18、i-epoxide condensation product of bisphenol-A and epichlorohydrin with terminal epoxide groups.4.5 The polyamide resin shall be a condensation product of a dimerized fatty acid in polyamines.4.6 Acceptable gelling agents are organic derivatives of magnesium montmorillonite and hydrogenated castor oi
19、l. Acceptable activators, if used, are methanol, ethanol, or propylene carbonate (see Note 8.4).4.7 The accelerator shall be 2,4,6-tri (dimethylamino-methyl) phenol.1When specified in the procurement documents, a dark red colored coating shall be furnished in which 50% or more (by volume) of the mag
20、-nesium silicate is replaced by synthetic red iron oxide conforming to ASTM D3721. The red coating shall meet all of the test requirements prescribed for the black coating, except that the nonvolatile content of Component A shall reflect the greater specific gravity of the iron oxide pigment.2In mos
21、t cases where the specified volatiles are not permitted, the volatile portion of the coal tar epoxy coating may be replaced with exempt materials to the extent necessary to assure compliance with the applicable regulations. The modified coating shall meet all of the test re-quirements specified here
22、in except that determination of compliance with the nonvolatile weight content shall reflect any difference in specific gravity between xylene and the substituted solvents.TYPICAL COMPOSITIONREQUIRED Component A and BINGREDIENTS Min. Max. wt. % vol. % INGREDIENT STDS.COMPONENT A (820.5 wt. %) (80 vo
23、l. %)Coal Tar Pitch 33.0 36.0 28.2 29.0 Par 4.3 and 5.1Polyamide Resin 11.0 12.0 9.5 12.4 Par 4.5 and 5.3Magnesium Silicate130.0 33.0 25.8 11.9 ASTM D605Xylene218.0 21.0 15.4 22.9 -Gelling Agent and Activator 2.5 2.6 2.0 2.4 Par 4.6Accelerator 1.2 1.3 1.1 1.4 Par 4.7Component A TOTALS 100 82.0 80.0C
24、OMPONENT B(18.0.5 wt. %) (20 vol. %)Liquid Epoxy Resin - - 18.0 20.0 Par 4.4 and 5.2TOTALS(Component A and B)100 100 100.0 100.0TABLE 1COMPOSITIONSSPC-Paint 16November 1, 2006Reaffirmed with editorial revisions June 15, 201535. Properties5.1 The coal tar pitch used shall meet the requirements for on
25、e of the types listed in Table 2.5.2 The epoxy resin shall be clear, shall be free of turbidity, crystals, and particulate matter; and shall meet the requirements of Table 3.5.3 The polyamide resin shall be clear, shall be free of turbidity and particulate matter, and shall meet the requirements of
26、Table 4.5.4 Component A of this coating shall meet the requirements of Sections 5.5 through 5.8.5.5 ODOR: Shall be normal for the materials permitted (ASTM D1296).5.6 COLOR: The color shall be black or dark red (see Note 8.5).5.7 The viscosity of Component A shall not exceed 160 poises when tested a
27、s follows:Fill a container having a diameter and a height of not less than 7.6 centimeters cm (3 inches in.) and 9.5 cm (3.75 in.), respectively, to a depth of not less than 7.6 cm (3 in.) with a representative sample of Component A. Set up an RVT series Brookfield viscometer with a No. 7 spindle an
28、d with guard removed. Bring the sample to (and thereafter maintain) a temperature of 77 F (25 C) and stir vigorously for two minutes with a stiff spatula. Immediately after stirring, lower the viscometer until 1/2 of the “neck” mark on the spindle is covered. Run the viscometer at 100 rpm for one mi
29、nute and take a reading of the position of the pointer on the dial. If the dial reading is 40 or less, the viscosity shall be considered to be 160 poises or less. If the reading is over 40, immediately start the motor and take additional readings at one-minute intervals. If one or more readings of 4
30、0 or less are obtained out of ten readings, taken at one-minute intervals, the viscosity of the material shall be considered to meet the viscosity requirement.5.8 The nonvolatile content of Component A shall not be less than 77 percent by weight (wt. %) when tested as follows:Place a stirrer made of
31、 stiff wire into a small disposable aluminum dish of about 5 cm (2 in.) in diameter and weigh to the nearest 0.1 mg. As rapidly as possible, place between TABLE 2ANALYSIS OF COAL TAR PITCHCHARACTERISTICSTYPE I TYPE 2 TYPE 3ASTM MethodMin. Max. Min. Max. Min. Max.Float Test at 50 C, seconds - - - - 1
32、50 220 D139Softening Point, in water, C 70 75 54 62 - - D36Insolubles in Carbon Disulfide, wt. % - 20 - 20 - 20 D4Ash, wt. %. - 0.5 - 0.5 - 0.5 D2415Distillation, Dry Basis, wt. %0-170 C - - - - - 0 -0-250 C - 0 - 0 - - -0-270 C - - - - - 6 -0-300 C - 5 - 5 - 15 -Softening point of residue at 300 C,
33、 in water, C- - - - 45 60 D36TABLE 3ANALYSIS OF EPOXY RESINCHARACTERISTICSREQUIREMENTSASTM MethodMin. Max.Epoxide Equivalent 180 200 D1652Nonvolatile content (1-2 grams after 1 h 105 2 C), wt. % 99 - -Color, Gardner - 5 D1544Specific Gravity 1.15 1.18 D1475Viscosity, Brookfield, at 15 C, poises 100
34、160 -SSPC-Paint 16November 1, 2006Reaffirmed with editorial revisions June 15, 20154two and three grams of Component A into the dish and weigh immediately to the nearest 0.1 mg. After weighing, spread the material over the bottom of the dish. Heat the dish, wire, and contents in a well-ventilated co
35、nvection-type oven maintained at 103 to 107 C (217 to 225 F) for three hours. After the material has been in the oven for a few minutes, and periodically thereafter, stir the material. Cool in a desiccator, weigh to the nearest 0.1 mg, and calculate the percentage of nonvolatile on a weight basis.5.
36、9 PHYSICAL REQUIREMENTS OF THE MIXED COATING: The mixed coating shall meet the requirements of Sections 5.10 through 5.15.5.10 ODOR: Shall be normal for the materials permitted (ASTMD1296).5.11 COLOR: The color shall be black or dark red (see Note 8.5).5.12 SAG: The coating shall not sag when tested
37、 as follows:Prepare approximately 500 mL of the material by thoroughly mixing 100 mL of Component B into 400 mL of Component A. Determine its viscosity immediately after mixing, using the same procedure outlined in Section 5.7, but employing a No. 5 spindle. If all of five readings taken at one-minu
38、te intervals are above 50, reduce the viscosity by adding the thinner in small increments until a reading of not greater than 50 is obtained. Press a strip of 1in. (2.5 cm) masking tape across the full width of a solvent-cleaned 7.5 cm x 15 cm (3 x 6 in.) cold-rolled steel panel. The tape shall be p
39、arallel to and centered on the shorter axis of the panel. Within five minutes after making the final check of viscosity, apply the material to the panel at a wet film thickness of at least 350 m (14 mils). The application may be made with a doctor blade having a gap of approximately 635 m (25 mils)
40、or by brush. Immediately after applying the material, carefully remove the masking tape and stand the panel in a vertical position (with the bare strip horizontal) in a draft-free, 24 to 27 C (75 to 80 F) location. Examine the panel after four hours. Sagging or running of the coating into the base a
41、rea shall constitute failure of the material to pass the sag test (see Note 8.6). TABLE 4ANALYSIS OF POLYAMIDE RESINCHARACTERISTICSREQUIREMENTSASTM MethodMin. Max.Amine Value* 330 360 -Nonvolatile content (1-2 grams after 1 h 105 2 C), wt. %. 97 - -Color, Gardner - 9 D1544Specific Gravity 0.96 0.98
42、D1475Viscosity, Brookfield, at 75 C, poises 7 9 -*The amine value is defined as the milligrams of potassium hydroxide equivalent to the amine alkalinity present in a one-gram sample. It is determined by a potentiomentric titration with standard perchloric acid according to the following method:1. We
43、igh the approximate amount of well-mixed resin to give a titration in the range of 12 to 18 mL into a tared 200 mL berzelius tall form beaker on an analytical balance. Cover the beaker with aluminum foil to minimize contact with air.2. From a graduated cylinder, carefully add 90 mL of solvent (suita
44、ble solvents are nitrobenzene, propylene carbonate, or acetonitrile), insert a stirring bar, cover the beaker with aluminum foil, and stir on a magnetic stirrer to dissolve the sample. Add the solvent immediately after weighing the sample. A fume hood should be used for all operations.3. From a grad
45、uated cylinder, add 20 mL of glacial acetic acid to the sample solution and stir for several minutes.4. Immerse the electrodes into the sample solution, stir for two minutes, and titrate potentiometrically with 0.1N perchloric acid using the millivolt scale. Record the millivolt readings every 0.1 m
46、L. Plot a graph showing the millivolts against the titration. The endpoint is the midpoint of the inflection on the titration curve.5. Conduct a blank determination on 90 mL of the solvent and 20 mL of the acetic acid. The blank need only be determined once for each lot of solvent used. On the major
47、ity of the lots used, the blank has been found to be zero.6. Calculate the amine value using the following formula:Amine Value = (Sample Titration - Solvent Blank) x Normality x 56.1Weight of SampleSSPC-Paint 16November 1, 2006Reaffirmed with editorial revisions June 15, 20155Save the mixed coating
48、for the penetration and adhesion tests described in Sections 5.13 and 5.14, respectively.5.13 PENETRATION: The coating shall pass the following test:Select and solvent-spray clean two 7.5 x 15 cm (3 x 6 in.) cold-rolled steel panels in accordance with ASTM D609. Assure that the panel is flat 25 m (1
49、 mil). Draw a coat of the coating mixed (including any thinning) for the sag test. The drawdown applicator shall be a nonmagnetic metal capable of spreading a film 50 mm (2 in.) or more in width, and shall have the clearance necessary to provide a total dry film thickness of 500 to 640 m (20 to 25 mils) in two applications of approximately equal thickness. Using a wet film gage, confirm that the applied t
