1、SSPC-Paint 40April 1, 20071SSPC: The Society for Protective CoatingsPainT SPECiFiCaTiOn nO. 40Zinc-Rich Moisture-Cure Polyurethane Primer, Performance-Based1. Scope1.1 This specification contains performance requirements for an organic zinc-rich moisture-cure polyurethane primer with a thermoset bin
2、der. SSPC PS 12.00 describes this primer as a Type II B zinc-rich primer. 2. Description2.1 This zinc-rich moisture-cure polyurethane primer is characterized by the presence of free polyisocyanate groups capable of reacting with atmospheric moisture in order to form a film. Either single or two-comp
3、onent packaging is acceptable. Zinc loading requirements are given in Section 4.2.1. Appendix A provides additional information for slip critical applications. 2.2 This primer is available in two Types. Type I formula-tions, applied over properly prepared carbon steel surfaces, are suitable for use
4、on parts or structures exposed in Environ-mental Zones 1Ainterior, normally dry; IBexterior, normally dry; 2Afrequently wet by fresh water, excluding immersion, 2Bfrequently wet by salt water, excluding immersion, and 3Bchemical exposure, neutral (with suitable topcoat). Type II formulations, applie
5、d over properly prepared carbon steel surfaces, are suitable for exposure in Environmental Zone 2Cfresh water immersion. Type II primers meet the require-ments of Section 7.4 for fresh water immersion in addition to the requirements for Type I. 2.3 Primers described by this standard provide corrosio
6、n resistance and accept application of suitable topcoats. Unless a Type I primer is specified, the primer described by this standard is intended to comply with Type II requirements.2.4 This primer is intended for application by spray directly to a steel substrate, with the allowance for small area t
7、ouch-up by brush (see Note 11.1).3. Reference Standards 3.1 The latest issue, revision, or amendment of the refer-ence documents in effect on the date of invitation to bid shall govern unless otherwise specified. Those documents marked with an asterisk (*) are referenced only in the Notes or the App
8、endix, which are not requirements of this specification.3.2. If there is a conflict between the requirements of any of the cited reference documents and this standard, the requirements of this standard shall prevail.3.3 SSPC STanDaRDS anD JOinT STanDaRDS: Guide 13 Guide for the Identification and Us
9、e of Industrial Coating Materials in Computerized Product Data-basesSP 1 Solvent CleaningSP 5/naCE no. 1 White Metal Blast CleaningPa 2 Measurement of Dry Coating Thick-ness with Magnetic GagesPS 12.00 Guide to Zinc-Rich Coating Sys-tems3.4 aSTM inTERnaTiOnaL STanDaRDS:1a 572 Standard Specification
10、for High-Strength Low-Alloy Columbium-Vanadium Structural Steel D 185 Standard Test Methods for Coarse Particles in Pigments, Pastes, and PaintsD 520 Standard Specification for Zinc Dust Pigment* D 562 Standard Test Method for Consistency of Paints Measuring Krebs Unit (KU) Viscosity Using a Stormer
11、-Type ViscometerD 714 Standard Test Method for Evaluating Degree of Blistering of Paints* D 1475 Standard Test Method for Density of Liquid Coatings, Inks, and Related Products* D 1640 Standard Test Methods for Drying, Curing, or Film Formation of Organic Coatings at Room TemperatureD 1654 Standard
12、Test Method for Evaluation of Painted or Coated Specimens Subjected to Corrosive Environments1 ASTM International, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959. Standards are available online at http:/www.astm.org.SSPC-Paint 40April 1, 20072* D 2369 Standard Test Method for Volatile Conte
13、nt of Coatings* D 2371 Standard Test Method for Pigment Content of Solvent-Reducible PaintsD 2794 Standard Test Method for Resistance of Organic Coatings to the Effects of Rapid Deformation (Impact)D 3278 Standard Test Methods for Flash Point of Liquids by Small Scale Closed-Cup ApparatusD 4417 Stan
14、dard Test Methods for Field Measurement of Surface Profile of Blast Cleaned SteelD 4541 Standard Test Method for Pull-Off Strength of Coatings Using Portable Adhesion TestersD 5894 Standard Practice for Cyclic Salt Fog/UV Exposure of Painted Metal, (Alternating Exposures in a Fog/Dry Cabinet and a U
15、V/Condensation Cabinet)D 6580 Standard Test Method for the Determination of Metallic Zinc Content in Both Zinc Dust Pigment and in Cured Films of Zinc-Rich Coatings3.5 FEDERaL SPECiFiCaTiOnS anD STanDaRDS:2FED-STD 141 Paint, Varnish, Lacquer and Related Materials: Methods of Sampling, Inspection, an
16、d Testing * Method 3011 Condition in ContainerMethod 4331 Spraying Properties3.6 aMERiCan naTiOnaL STanDaRDS inSTiTUTE (anSi) STanDaRD:3anSi Z129.1 Hazardous Industrial ChemicalsPrecautionary Labeling3.7 american association of Highway and Transporta-tion Officials (AASHTO) Specification4* Standard
17、Specifications for Highway Bridges, Division 1, Section 10.32.3.2.3, Appendix A, Testing Method to Determine the Slip Coefficient for Coatings Used in Bolted Joints4. Composition Requirements4.1 The manufacturer is given wide latitude in the selection of materials and manufacturing processes. 4.2 Pi
18、GMEnT REQUiREMEnT4.2.1 The major pigment component in this coating is zinc dust. The paint shall contain a minimum of 65% zinc dust pigment by weight in the dry film per ASTM D 6580 (see Notes 11.2 and 11.3). 4.2.2 Other optional pigment components include extenders, curing aids, tinting colors, and
19、 suspension and pot life control agents. 4.3 RESin REQUiREMEnT: The resin used in the coating shall be a polyisocyanate-based product that cures through a chemical reaction with atmospheric moisture. Use of other resins or modifiers shall be minimal and limited to products necessary for formula ingr
20、edient compatibility and to improve recoating properties. See Note 11.4 for information on modi-fying resins and Note 11.5 for information on volatile organic compound (VOC) content.5. Standard Testing Conditions5.1 TEST PanELS: The hot rolled steel test panels shall conform to ASTM A 572. Panel siz
21、e shall be 100 mm x 150 mm x 3.2 mm (4 inch x 6 inch x 1/8 inch). Test panels shall be solvent cleaned in accordance with SSPC-SP 1 prior to blast cleaning. The test panels shall be blast cleaned in accordance with SSPC-SP 5. The blast profile shall be 44 to 57 micrometers (1.75 to 2.25 mils) as mea
22、sured in accordance with ASTM D 4417, Method C. 5.2 aPPLiCaTiOn: The primer shall be spray applied as a single coat in accordance with manufacturers written recommendations. The primer shall show no streaking, running, sagging, or other defects during application or while drying.5.3 DRY FiLM THiCKnE
23、SS: The dry film thickness (DFT) on the test panels shall meet the manufacturers written recom-mended range. The DFT shall be measured in accordance with SSPC-PA 2, Appendix 5. 5.4 CURE: The primer shall be dried and cured in accor-dance with manufacturers written recommendations. Before any testing
24、, all coated panels shall be aged for a minimum of 7 days in an environment with a minimum relative humidity of 55%, and at a temperature of 23 2 C (73.5 3.5 F).5.5 SCRiBinG: Scribe two parallel lines on the face of the coated panels so as to expose the underlying metal 2 FED STD 141 is available fr
25、om http:/assist.daps.dla.mil/online/start/ (or search for assist through your web browser).3 American National Standards Institute, 1819 L Street, NW, Suite 600, Washington, DC 20036. Standards are available online at www.ansi.org4 American Association of State Highway and Transportation Officials,
26、444 North Capitol Street, NW, Suite 249, Washington DC 20001. Standards are available online at https:/bookstore.transportation.org.SSPC-Paint 40April 1, 20073before testing. The lines shall be at least 2.5 cm (1 inch) from the edge, the top, and the bottom of each panel and at least 5 cm (2 inches)
27、 from each other. Each scribe shall be 6 cm (2.4 inches) long. The scribes shall run vertically or at an angle across the face of the panel. Follow the scribe-making procedure described in ASTM D 1654. 5.6 BaCKS anD EDGES: Coat and seal all edges and the back side of each panel with a coating or tap
28、e that will provide the necessary protection to these surfaces.6. Requirements of Liquid Coating 6.1 MiXinG: The liquid portion of a multi-component primer shall be mixed and dispersed to produce a product that is uniform, stable, free from grit, and in conformance with the requirements of this spec
29、ification.6.1.1 The pigment portion of a multi-component primer (if supplied as a dust) shall be dry and loosely packed prior to mixing.6.1.2 The single-component primer shall be capable of being dispersed under mechanical agitation to a smooth, uniform consistency and shall not show any objectionab
30、le properties in the mix. 6.1.3 After mixing and filtering through a standard 60 mesh screen in accordance with ASTM D 185 the amount of coarse particles and skins retained shall not exceed 0.5% by weight (see Note 11.6).6.2 STORaGE STaBiLiTY: Neither the vehicle of the multicomponent coating nor th
31、e ready-mixed primer shall show thickening that is detrimental to performance or appli-cation properties. The components or primer shall exhibit no curdling, gelling, gassing, or hard caking after being stored unmixed for a minimum of six months from date of delivery in a tightly sealed, unopened co
32、ntainer at a temperature of 10 to 32 C (50 to 90 F). The manufacturer shall also provide information on primer shelf life on the product data sheet as stated in SSPC-Guide 13, Section 4.4.11. 6.3 WORKinG PROPERTiES: The mixed primer coating shall spray easily and show no signs of, streaking, running
33、, sagging, or other objectionable features when applied within the coating manufacturers recommended film thickness range, and tested in accordance with FED-STD 141, Method 4331. Note 11.7 provides additional information on material inspec-tion and quality assurance tests.7. Laboratory Physical Test
34、s of applied Films7.1 PRiMER aDHESiOn TO SUBSTRaTE: Apply the primer to three panels in accordance with Sections 5.1 through 5.4. Test adhesion according to ASTM D 4541, Method II, III, IV, or V. Perform three pulls per panel. The minimum adhesion value of the primer to the substrate for each pull s
35、hall be 4.1 MPa (600 psi). In the case of adhesive failure below 4.1 MPa (600 psi), the pull test shall be repeated. 7.2 TOPCOaT aDHESiOn: Prepare three panels in accordance with 5.1 through 5.3. Apply a topcoat and cure as recommended by the manufacturer. The thickness of the topcoat shall conform
36、to the manufacturers recommendations. Perform three pulls per panel. The minimum adhesion value of each pull shall be 4.1 MPa (600 psi). In the case of adhesive failure below 4.1 MPa (600 psi), the pull test shall be repeated. Information on the recoat time (which varies with each formula-tion) shal
37、l be provided by the manufacturer.7.3 DiRECT iMPaCT RESiSTanCE: The minimum impact resistance shall be 6.8 Nm (60 inch-lb) when measured in accordance with ASTM D 2794.7.4 WaTER iMMERSiOn (Type ii primers only): This test is intended to evaluate the ability of the primer to protect the steel substra
38、te in fresh water immersion service. 7.4.1 Description of Test: Prepare triplicate panels in accordance with Section 5. Completely immerse them in deionized water of conductivity no higher than 5 S for one year. During this time the water shall be aerated. 7.4.2 Rust Evaluation: After the specified
39、exposure time, each replicate panel shall have no rusting on the coated portion. Slight rusting in the scribe mark is permissible and resulting staining shall be ignored. Strips 6 mm (1/4 inch) wide along the edges of the panel shall be ignored.7.4.3 Blister Evaluation: After the specified exposure
40、time, there shall be no blistering of the coated portion.7.4.4 Scribe Evaluation: After the specified exposure time, the maximum undercutting or rusting measured from the center of the scribe shall be no greater than 2 mm (3/32 in) when evaluated in accordance with ASTM D 1654 (a rating of 7).8. acc
41、elerated Laboratory Weathering Requirements8.1 CYCLiC SaLT SPRaY/UV/COnDEnSaTiOn CaBinET: Triplicate panels prepared in accordance with Section 5 shall be exposed in a cyclic test cabinet in accordance with ASTM D 5894 for 5000 hours. 8.1.1 Rust Evaluation: After the specified exposure time, each re
42、plicate panel shall have no rusting of the coated portion (a rust rating of 10 per SSPC-VIS 2). Slight rusting in the scribe mark is permissible and resulting staining shall be ignored. Strips 6 mm (1/4 inch) wide along the edges of the panel shall be ignored.SSPC-Paint 40April 1, 200748.1.2 Blister
43、 Evaluation: After the specified exposure time, there shall be no blistering of the coated portion (a rating of 10 per ASTM D 614).8.1.3 Scribe Evaluation: After the specified exposure time, the undercutting from the center of the scribe, measured at any point along the scribe, shall be a maximum of
44、 2 mm (3/32 inch) when evaluated in accordance with ASTM D 1654. Slight rusting in the scribe mark is permissible and resulting staining shall be ignored. 8.2 SLiP TEST: If slip testing is required, refer to Appendix A.1.Table 1 provides a summary of performance require-ments.9. Labeling 9.1 Labelin
45、g shall conform to ANSI Z129.1. 9.2 Technical data shall be provided for at least all data elements categorized as “essential” in SSPC-Guide 13.10. Disclaimer 10.1 While every precaution is taken to ensure that all information furnished in SSPC standards and specifications is as accurate, complete,
46、and useful as possible, SSPC cannot assume responsibility nor incur any obligation resulting from the use of any materials, coatings, or methods specified herein, or of the specification or standard itself.10.2 This specification does not attempt to address problems concerning safety associated with
47、 its use. The user of this specification, as well as the user of all products or prac-tices described herein, is responsible for instituting appropriate health and safety practices and for ensuring compliance with all governmental regulations.11. notesNotes are not requirements of this standard. 11.
48、1 All zinc-rich coatings are preferably applied by spray, but may be brushed for small areas or to fill in irregularities. Brushing should be done with extreme caution to avoid zinc TESTnUMBER OF SPECiMEnSEXPOSURETiMERUST RaTinG, SSPC-ViS 2BLiSTER RaTinG, aSTM D 714SCRiBE UnDERCUTTinG, aSTM D 1654Co
49、rrosion after expo-sure in Cyclic Acceler-ated Test Cabinet (ASTM D 5894)3 5000 hours All 10 All 10Slight rust in scribe, max. undercutting2 mm (rating of 7)MiniMUM aCCEPTaBLE RaTinG TESTPrimer Adhesion3 panels,3 pulls per panel-4.1 MPa (600 psi) for any pullASTM D 4541, Method II, III, IV or VTopcoat Adhesion 3 panels,3 pulls per panel-4.1 MPa (600 psi) for any pullASTM D 4541, Method II, III, IV or VDirect Impact Resistance3 -68 Nm(60 inch-lb)ASTM D 2794Water Immersion(Type II only)3 1 yearAll 10 All 10Deionized water with conductivity of less than 5 s/c
