1、SSPC-Paint 39April 1, 20046-1671. Scope1.1 This specication contains performance require-ments for a two-component, weatherable polyurea topcoat. The coating may be fast or moderately fast drying (see Note 12.1). 1.2 Coatings meeting the requirements of this specica-tion are generally suitable for e
2、xposures in Environmental Zones 1A (interior, normally dry), 1B (exterior, normally dry), 2A (frequently wet by fresh water, excluding immersion), and 2B (frequently wet by salt water, excluding immersion). Resistance of polyurea topcoats in Environmental Zones 3B (chemical exposure, neutral) and 3C
3、 (chemical exposure, alkaline) can vary based upon formulation. The coating manufacturer should be contacted for specic chemical resistance data if required.1.3 The specied coating is intended for application by single-component airless spray, electrostatic spray, or plural-component equipment, depe
4、nding upon its formulation.1.4 This coating is intended for use as a topcoat over suitably primed ferrous metal and cementitious substrates.2. Description2.1 The resins used in the coating shall result in a polyurea product as described in Notes 12.1.1 and 12.1.2 or a hybrid system as described in N
5、ote 12.2. This coating is comprised primarily of polyamine and polyisocyanate resins that react to form a polyurea. 2.2 COATING TYPE: The two types of polyurea coat-ings are differentiated by drying time. 2.2.1 Type 1 (Fast Drying): A Type 1 coating dries to handle in less than 30 minutes (per ASTM
6、D 1640).2.2.2 Type 2 (Moderate Drying): A Type 2 coating dries to handle from 30 minutes to 2 hours (per ASTM D 1640).2.3 RESIN TYPES: A coating meeting the requirements of this specication shall be a hindered aliphatic polyurea, non-hindered aliphatic polyurea, or hybrid coating (see Notes 12.1 and
7、 12.2).2.4 WEATHERING LEVELS: This specification contains three levels of accelerated weathering (Levels 1A, 2A and 3A) and two levels of outdoor weathering performance (Levels 1N and 2N). Table 1 species the amount of time the coating must perform before noticeable color and gloss change in order t
8、o achieve the required performance level as dened in paragraphs 2.4.1 through 2.4.5 and Table 1. A certain level of accelerated weathering does not necessarily correspond to a particular level of atmospheric weathering. The speci-er shall stipulate the requirements for outdoor weathering, accelerate
9、d weathering, or both. These are two independent, complementary tests for measuring coating performance. If no performance level and/or specic weathering test is speci-ed, Level 3A for accelerated weathering (longest accelerated exposure) will be assumed.2.4.1 Level 1A: Level 1A coatings have been e
10、valuated for 500 hours in accelerated weathering testing.2.4.2 Level 2A: Level 2A coatings have been evaluated for 1000 hours in accelerated weathering testing.2.4.3 Level 3A: Level 3A coatings have been evaluated for 2000 hours in accelerated weathering testing.2.4.4 Level 1N: Level 1N coatings hav
11、e been evaluated for 12 months in natural exterior weathering testing.2.4.5 Level 2N: Level 2N coatings have been evaluated for 24 months in natural exterior weathering testing.Typical specular gloss levels are shown in Note 12.3.Polyurea topcoats are available in a wide range of color and gloss. Pr
12、ocurement documents shall state the desired level of performance, exposure method, color, and gloss. For example, a specier may require Level 2N outdoor exposure, initial gloss greater than 80, matched to a specic color.2.5 This specication addresses performance proper-ties of only white and pastel
13、colored coatings. Because dark pigments are more sensitive to ultraviolet degradation, testing of individual coatings in deep tones and safety colors is neces-sary to establish their color and gloss retentive properties.SSPC: The Society for Protective CoatingsPAINT SPECIFICATION NO. 39Two-Component
14、 Aliphatic Polyurea TopcoatFast or Moderate Drying, Performance-BasedSSPC-Paint 39April 1, 20046-1683. Referenced Standards 3.1 The latest issue, revision, or amendment of the refer-enced documents in effect on the date of invitation to bid shall govern unless otherwise specied. Those documents mark
15、ed with an asterisk (*) are referenced only in the Notes or the Appendix, which are not requirements of this specication.3.2 If there is a conict between the requirements of any of the cited reference documents and this specication, the requirements of this specication shall prevail.3.3 SSPC STANDAR
16、DS: Guide 13 Guide for the Identication and Use of Industrial Coating Materials in Computerized Product DatabasesPA 2 Measurement of Dry Film Thickness with Magnetic Gages3.4 ASTM INTERNATIONAL STANDARDS:1D 523 Standard Test Method for Specular GlossD 562 Standard Test Method for Consistency of Pain
17、ts Measuring Krebs Units (KU) Viscosity Using the Stormer-Type ViscometerD 1014 Standard Practice for Conducting Exterior Exposure Tests of Paints on SteelD 1296 Standard Test Method for Odor of Volatile Solvents and DiluentD 1475 Standard Test Method for Density of Liquid Coatings, Inks, and Relate
18、d ProductsD 1535 Standard Practice for Specifying Color by the Munsell SystemD 1640 Standard Test Methods for Drying, Curing, or Film Formation of Organic Coatings at Room TemperatureD 1849 Standard Test Method for Package Stability of PaintD 2244 Standard Test Method for Calculation of Color Differ
19、ences from Instrumentally Measured Color Coordinates* D 2369 Standard Test Method for Volatile Content of Coatings* D 2371 Standard Test Method for Pigment Content of Solvent-Reducible Paints* D 2621 Standard Test Method for Infrared Identication of Vehicle Solids from Solvent-Reducible PaintsD 3925
20、 Practice for Sampling Liquid Paints and Related Pigmented CoatingsD 4541 Standard Test Method for Pull-Off Strength of Coatings Using Portable Adhesion TestersD 4587 Standard Practice for Fluorescent UV-Condensation Exposures of Paint and Related CoatingsD 5402 Standard Practice for Assessing the S
21、olvent Resistance of Organic Coatings Using Solvent Rubs 3.5 AMERICAN NATIONAL STANDARDS INSTITUTE (ANSI) STANDARD:2Z129.1 Hazardous Industrial Chemicals Precautionary Labeling3.6 FEDERAL SPECIFICATIONS AND STANDARDS:3FED-STD-141: Paint, Varnish, Lacquer and Related Materials: Methods of Inspection,
22、 Sampling and Testing3* Method 3011 Condition in ContainerMethod 4331 Spraying Properties4. Composition 4.1 This is a performance-based coating specication, therefore the manufacturer is given wide latitude in the selection of materials and manufacturing processes (see Note 12.4). 4.2 RESIN REQUIREM
23、ENT: The reactive components used in the coating shall be comprised primarily of polyamine and polyisocyanate resins that react to form a polyurea (see Notes 12.1 and 12.2). 5. Standard Testing Conditions5.1 TEST PANELS each test species the number of replicates: Panel size shall be 75 x 150 x 5 mm
24、(3 x 6 x 3/16 inches) or greater. All test panels shall be coated with the primer recommended by the topcoat manufacturer. Follow the primer manufacturers instructions for surface preparation, application, and cure of the primer. 5.2 APPLICATION: In accordance with the manufac-turers written recomme
25、ndations, the topcoat shall be spray-applied in a single coat or multiple coats. 5.3 DRY FILM THICKNESS: The minimum dry lm thickness (DFT) of the test panels shall be the manufacturers written recommended minimum thickness. If there is no recom-mended lm thickness, then the minimum DFT shall be 150
26、 1ASTM, 100 Barr Harbor Road, West Conshohocken PA, 19248, (http:/www.astm.org).2ANSI, 1819 L Street, NW, Washington, DC 20036, (http:/www.ansi.org).3FED-STD 141 may be obtained from http:/assist.daps.dla.mil.SSPC-Paint 39April 1, 20046-169micrometers (6.0 mils). The maximum DFT of the test panels s
27、hall be 50 micrometers (2.0 mils) more than the minimum or 135% of the minimum, whichever is greater. The DFT shall be measured in accordance with Appendix 5 of SSPC-PA 2.5.4 CURE: Before any testing, the coating shall be dried and cured in accordance with the manufacturers written recommendations,
28、or otherwise shall be aged for a minimum of 30 days in an environment with a relative humidity of 50 10% and an ambient temperature of 25 2C (77 5F).45.5 BACKS AND EDGES: Coat and seal all edges and the back of each panel with a coating or tape that will provide the necessary protection to these sur
29、faces.6. Requirements of Liquid Coating6.1 APPLICATION PROPERTIES: All guidance provided by the manufacturer regarding mixing of multi-compo-nent products, thinning requirements, and special application requirements shall be followed. The coating shall be easily applied by spray when tested in accor
30、dance with FED-STD-141, Method 4331. The paint shall show no streaking, running, or sagging during application or while drying.6.2 PACKAGE STABILITY: Package stability shall be tested in accordance with ASTM D 1849. Storage conditions shall be 30 days at 52 1C (125 2F). A change in consis-tency of g
31、reater than 10 Krebs units or noncompliance with the application requirements shall be cause for rejection.7. Physical Tests of Applied Films 7.1 ADHESION TESTS: Adhesion properties of the polyurea topcoat shall be determined by measurement of adhesion values between:a) the polyurea topcoat and the
32、primer, and if appli-cableb) the second coat of polyurea topcoat and the same previously applied topcoat.The coating manufacturer shall provide an acceptable time frame between application of coatings in a multi-coat system. Unless the purchaser specically requests a variance, the maximum dry lm thi
33、ckness and the minimum curing time (with reported conditions for temperature and humidity) as stated on the manufacturers product data sheets shall be used for coating application prior to adhesion testing.7.1.1 Topcoat Adhesion to Primer: Prepare three panels according to Sections 5.1 through 5.4.
34、Test adhesion according to ASTM D 4541, Type III or Type IV, with three pulls on each of the three replicate panels. At least two of the pulls on each panel as well as the average of the three pulls on each panel shall be at least 4.1 MPa (600 psi).5One pull on each panel may be as low as 3.4 MPa (5
35、00 psi).7.1.2 Recoatability: Prepare three panels according to Sections 5.1 through 5.4. Apply a second coat of topcoat and cure according to the manufacturers recommendations. Test adhesion according to ASTM D 4541, Type III or Type IV, with three pulls on each of the three replicate panels. At lea
36、st two of the pulls on each panel as well as the average of the three pulls on each panel shall be at least 4.1 MPa (600 psi).5 One pull on each panel may be as low as 3.4 MPa (500 psi). 7.2 SOLVENT RESISTANCE: Prepare three panels according to Sections 5.1 through 5.4. Conduct a solvent resistance
37、test on each panel in accordance with ASTM D 5402 using 100 double rubs of MEK solvent. When viewed without magnication, no topcoat shall be visible on the cloth.7.3 DRY TIME: Spray the topcoat onto a suitable test panel at the maximum thickness recommended by the manufacturer. Test the topcoat for
38、Dry-Through (or Dry-To-Handle) Time in accordance with ASTM D 1640. 7.3.1 A Type 1 topcoat must be dry in less than 30 minutes.7.3.2 A Type 2 topcoat must be dry in 30 minutes to 2 hours.8. Weathering Requirements 8.1 WEATHERING RESISTANCE: Two weathering test procedures are described below. Test da
39、ta may not be available for the desired color and gloss specied. Performance levels are established using whites and light colors. Outdoor testing, as described in Section 8.1.2, is preferred. If outdoor weathering test data is not available for the desired color and gloss specied, accelerated test
40、data shall be used until outdoor weathering data becomes available. It is left to the discretion of the specier whether to accept outdoor data from a similar color or to use UV-A data in lieu of outdoor weathering data. The natural weathering site shall have a daily average total ultraviolet radiati
41、on of 10.1 MJ/m2. NOTE: Commercial test 4The 30-day cure requirement is based on obtaining optimal mechanical properties that may be required by some speciers.5It is recognized that under controlled laboratory conditions with specic coatings, higher adhesion values (above 4.1 MPa/600 psi) can be rea
42、dily obtained. By committee consensus, a minimum recoatibility adhesion level of 4.1 MPa (600 psi) was deemed acceptable for testing dened in Section 5.3 based on eld experience of committee personnel and examination of other referenced standards that have with-stood the test of time. ASTM D 5144-97
43、, para 8.1.1 “Standard Guide for Use of Protective Coatings in Nuclear Power Plants” and ANSI SSPC-Paint 39April 1, 20046-170sites in North America conforming to this requirement are located in southern Florida and Arizona. Other test sites may be used if agreed upon by the contracting parties. Sixt
44、y-degree specular gloss shall be measured in accordance with ASTM D 523 and tristimulus color measured according to ASTM D 2244 at the beginning and end of the time period dened by the required performance level.8.1.1 Accelerated Weathering: Triplicate test panels shall be prepared in accordance wit
45、h Sections 5.1 through 5.4. Accelerated weathering shall be performed in accordance with ASTM D 4587, Cycle 2. Sixty-degree gloss shall be measured according to ASTM D 523 and tristimulus color measured according to ASTM D 2244 at the beginning and end of the time period dened in the selected level.
46、 The coating shall meet the weathering test requirements in Table 1 for the required performance level.8.1.1.1 Level 1A: Products conforming to this performance level shall have a maximum gloss reduction of 20% and maximum color change of 2.0 E* per ASTM D 2244 after 500 hours expo-sure.8.1.1.2 Leve
47、l 2A: Products conforming to this performance level shall have a maximum gloss reduction of 30% and maximum color change of 3.0 E* after 1000 hours exposure.8.1.1.3 Level 3A: Products conforming to this performance level shall have a maximum gloss change of 40% and a maximum color change of 3.0 DE*
48、after 2000 hours exposure.N5.12-1973, para 6.4 “Protective Coatings (Paints) for the Nuclear Industry” both call for minimum adhesion values of 1.4 MPa (200 psi). The minimum recoatability adhesion value of 4.1 MPa (600 psi) specied herein is a substantial increase over the stringent requirements of
49、 coatings for nuclear service.TABLE 1SUMMARY OF PERFORMANCE TESTING RESULTS TO BE REPORTEDMEASUREMENT TEST/MINIMUM CRITERIA(b)Exposure TestPerformanceLevel Exposure TimeColor Retention perASTM D 2244(Color change inE*)(a)Maximum GlossReduction from OriginalReading perASTM D 523Level 1A 500 h 2.0 20%Level 2A 1000 h 3.0 30%AcceleratedWeathering(c)(ASTM D 4587,Cycle 2)Level 3A 2000 h 3.0 40%Level 1N 12 mo 2.0 35%South FloridaWeathering(c)(ASTM D 1014)Level 2N 24 mo(d) 3.0 50%TEST METHOD CRITERIASolvent resistance (ASTM
