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1、AS 3750.18-2002 Paints for steel structures Part 18 Moisture cure urethane(single-pack) systemsAS 3750.182002?Australian StandardPaints for steel structuresPart 18: Moisture cure urethane(single-pack) systemsAS 3750.1.au and looking up the relevant Standardin the on-line catalogue.Alternatively, the
2、 printed Catalogue provides information current at 1 January eachyear, and the monthly magazine, The Australian Standard, has a full listing ofrevisions and amendments published each month.We also welcome suggestions for improvement in our Standards, and especiallyencourage readers to notify us imme
3、diately of any apparent inaccuracies orambiguities. Contact us via email at mailstandards.au, or write to the ChiefExecutive, Standards Australia International Ltd, GPO Box 5420, Sydney, NSW2001.This Standard was issued in draft form for comment as DR 01236.AS 3750.182002?Australian StandardPaints f
4、or steel structuresPart 18: Moisture cure urethane(single-pack) systems睷眮抵晸眮捯?First published as AS 3750.182002.COPYRIGHT Standards Australia InternationalAll rights are reserved. No part of this work may be reproduced or copied in any form or by anymeans, electronic or mechanical, including photoco
5、pying, without the written permission of thepublisher.Published by Standards Australia International LtdGPO Box 5420, Sydney, NSW 2001, AustraliaISBN 0 7337 4731 0AS 3750.1820022PREFACEThis Standard was prepared by the Australian members of the Joint StandardsAustralia/Standards New Zealand Committe
6、e CH-003, Paints and Related Materials. Afterconsultation with stakeholders in both countries, Standards Australia and StandardsNew Zeland decided to develop this Standard as an Australian Standard rather than anAustralian/New Zealand Standard.The following Standards in this series have been publish
7、ed:AS3887Paints for steel structuresCoal tar epoxy (two-pack)3750Paints for steel structures3750.1Part 1:Epoxy mastic (two-pack)For rusted steel3750.2Part 2:Ultra high-build paintAS/NZS3750.3Part 3:Heat resistingExterior3750.4Part 4:Bitumen paint3750.5Part 5:Acrylic full gloss (two-pack)3750.6Part 6
8、:Full gloss polyurethane (two-pack)3750.7Part 7:Aluminium paint3750.8Part 8:Vinyl paintsPrimer, high-build and gloss3750.9Part 9:Organic zinc-rich primer3750.10Pa睷rt 10:Fu眮ll gloss ep抵oxy (two-pack)3750.11Part 11:Chlorinated rubberH晸igh-build 眮and gloss3750.12Part 12:Alkyd/micaceous iron oxide3750.1
9、3Part 13:Epoxy primer (two-pack)捯?3750.14Part 14:High build epoxy (two-pack)3750.15Part 15:Inorganic zinc silicate paint3750.16Part 16:Waterborne primer and paint for galvanized zinc-aluminium alloy-coated and zinc-primed steel3750.17Part 17:Etch primers (single pack and two-pack)The terms normative
10、 and informative have been used in this Standard to define theapplication of the appendix to which they apply. A normative appendix is an integral partof a Standard, whereas an informative appendix is only for information and guidance.3AS 3750.182002CONTENTSPageSECTION 1SCOPE AND GENERAL1.1SCOPE.41.
11、2OBJECTIVE.41.3REFERENCED DOCUMENTS.41.4DEFINITIONS.41.5SAFETY PRECAUTIONS.5SECTION 2MATERIAL REQUIREMENTS2.1GENERAL.62.2CONDITIONS OF TEST.62.3LIQUID PAINT.62.4APPLICATION PROPERTIES.72.5APPLIED FILM.9SECTION 3PACKAGING AND LABELLING3.1PACKAGING.123.2LABELLING.12APPENDICESAPUR睷CHASING眮 GUIDEL抵INES.
12、晸.眮.捯.?.13BGUIDANCE ON THE USE AND APPLICATION OF MOISTURE CUREURETHANE PAINT.14CMEANS FOR DEMONSTRATING COMPLIANCE WITH THIS STANDARD.17DREFERENCED DOCUMENTS.19EPREPARATION OF TEST PANELS.21FPREPARATION OF PANELS FOR TESTING RESISTANCE TOWEATHERING.22GASSESSMENT OF RESISTANCE OF A MOISTURE CURE URE
13、THANEPAINT TO ALKALI AND ACID.23AS 3750.1820024STANDARDS AUSTRALIAAustralian StandardPaints for steel structuresPart 18: Moisture cure urethane(single-pack) systemsSECTION 1SCOPE AND GENERAL1.1 SCOPEThis Standard specifies requirements for one-component, solvent-borne, unmodifiedmoisture cure uretha
14、ne (MCU) paints intended to be used primarily for the protection ofiron and steel against exterior atmospheric corrosion. They are best applied by conventionalair or airless spraying, but are also suitable for application by brush or roller.These paints are intended primarily for use as a paint syst
15、em for the protection of iron andsteel against corrosion involving wet and damp areas, high humidity, coastal/marine andindustrial fallout. Some of these products are suitable for burial and immersion.Polyurethane paints are in general more suitable for use in those applications where it isdesirable
16、 to r睷etain colou眮r and glos抵s in additi晸on to prov眮iding corro捯sion resistance.Moisture cure urethane paint, specified in this Standard as zinc-pigmen?ted primer, MIOintermediate and finish coat paint, is described as Paint Reference Nos 38, 39 and 40respectively in AS/NZS 2312 and may be used with
17、 the appropriate systems MCU1and MCU2.NOTES:1Unmodified MCU paints are defined in ASTM D16 as Type II.2Appendix A contains recommendations and advice on information that should be provided bythe purchaser at the time of enquiry or order.3Additional information on the use and application of moisture
18、cure urethane paints iscontained in Appendix B.4Alternative methods for determining compliance with this Standard are given in Appendix C.5The paints are available in a range of colours.1.2 OBJECTIVEThe objective of this Standard is to specify requirements for moisture cure urethane paintsused on st
19、eel structures. It forms part of a series of product Standards for paints referred toin AS/NZS 2312.1.3 REFERENCED DOCUMENTSA list of the documents referred to in this Standard is contained in Appendix D.1.4 DEFINITIONSFor the purpose of this Standard, the definitions given in AS/NZS 2310 and those
20、belowapply.COPYRIGHT5AS 3750.1820021.4.1 Finish coatMoisture cure urethane finish coat consisting essentially of an aliphatic prepolymer, to cureas a polyurea polymer, designed for use over zinc-pigmented primer or MIO intermediatepaints. It is classed as Paint Reference No. 40 in AS/NZS 2312. Finis
21、h coat products maycontain MIO pigmentation.1.4.2 MCU acceleratorAn additive to accelerate cure and re-coat times and usually added in small quantities.These substances are consumed by the reaction.1.4.3 MIO intermediate paintMIO based intermediate paint consisting essentially of an aromatic prepoly
22、mer, to cure as apolyurea polymer to be used as an intermediate coat over zinc-pigmented primer paint. It isclassed as Paint Reference No. 39 in AS/NZS 2312.1.4.4 Moisture cure urethane tarMoisture cure urethane paint consisting essentially of an aromatic prepolymer, to cure as apolyurea polymer, co
23、ntaining refined tar and MIO. It is used as the primer and/orintermediate coat and/or topcoat in a moisture cure urethane paint system, and is applied at125175 m dry film thickness in a single coat. Particularly suitable for use with potablewater storage, sewage and other immersed applications.NOTE:
24、 Moisture cure urethane tar can be used in conjunction with zinc-pigmented primer, MIOintermediate and finish coat products; however, for the uses of this type of product, themanufacturers recommendations should be consulted.1.4.5 PaintSingle compo睷nent prod眮uct as supp抵lied by th晸e manufac眮turer.捯?
25、1.4.6 Sealer/primerMoisture cure urethane paint consisting generally of an aromatic prepolymer, to cure as apolyurea primer, to be used as a sealer/primer over hand- or power-tool-cleaned steelsurfaces, galvanizing or thermal sprayed coatings. Sealer/primer is applied at 50 10 mand is designed to be
26、 overcoated by MIO intermediate and finish coat paint.NOTE: For use of this type of product the manufacturers recommendations should be consulted.1.4.7 Zinc-pigmented primerA moisture cure urethane primer consisting essentially of an aromatic prepolymer, to cureas a polyurea polymer, containing not
27、less than 85% zinc in the dry film. It is classed asPaint Reference No. C38 in AS/NZS 2312.1.5 SAFETY PRECAUTIONSMoisture cure urethane paints contain a very small proportion of free isocyanate monomer,less than a two-pack polyurethane, and an organic solvent. The level of isocyanate mayincrease wit
28、h the use of an MCU accelerator. Refined tars may contain very smallproportions of hazardous materials.NOTE: The manufacturers safety recommendations should be followed (see also Appendix B).COPYRIGHTAS 3750.1820026SECTION 2 MATERIAL REQUIREMENTS2.1 GENERALPaint shall comply with the requirements of
29、 Clauses 2.3 to 2.5 inclusive. These propertiesand requirements are summarized in Table 1.2.2 CONDITIONS OF TESTUnless otherwise specified in this Standard, the following test conditions shall apply:(a)The test panel material and its preparation shall be in accordance with Appendix E.(b)The type and
30、 size of test panels shall be as specified in Table 1.(c)Conditions for testing shall be in accordance with AS/NZS 1580.101.5.(d)The spreading rate of the relevant paint applied by brush, roller or spray shall resultin a dry film thickness, as determined by AS/NZS 1580.108.1, of(i)zinc-pigmented pri
31、mer.75 10 m;(ii)MIO intermediate paint.75 10 m;(iii)finish coat paint.75 10 m;(iv)sealer/primer.50 10 m; and(v)M睷CU tar.眮.抵.晸.眮.捯.?.150 15 m.(e)Conditions for air-drying shall be in accordance with AS 1580.101.1.2.3 LIQUID PAINT2.3.1 Condition in containerWhen each component is tested in accordance
32、with AS/NZS 1580.103.1 at the time ofdelivery from the manufacturer/supplier, it shall be free from gel, coarse particles, skins andforeign matter.2.3.2 Volume solidsWhen determined in accordance with AS 1580.301.2, utilizing air drying conditions of 7 dunder the routine conditions of AS/NZS 1580.10
33、1.1 in lieu of a 3 h drying period of 105C,the volume solids of the mixed paint shall be greater than 60% and within 5% of themanufacturers product specification.2.3.3 Storage properties2.3.3.1 Degree of settlingWhen stored at 23 3C in sealed, unopened containers for 12 months from the date ofmanufa
34、cture, the rating for the settling, when determined in accordance withAS/NZS 1580.211.1 shall be not less than 4.2.3.3.2 Re-incorporation after storageWhen stored at 23 3C in sealed, unopened containers for 12 months from the date ofmanufacture and tested in accordance with AS/NZS 1580.211.2, the pr
35、oducts shall bereadily re-incorporated and, when mixed, shall produce a paint of uniform consistency freefrom lumps, gel and other defects.COPYRIGHT7AS 3750.1820022.3.4 ConsistencyWhen thoroughly incorporated, the mixed paint shall have a consistency, determined inaccordance with AS/NZS 1580.214.1 o
36、r AS/NZS 1580.214.5, within the range specified bythe manufacturer.2.4 APPLICATION PROPERTIES2.4.1 GeneralApplication properties shall be assessed using vertical steel test panels prepared inaccordance with Appendix E. When applied in accordance with the manufacturersrecommended methods of applicati
37、on, the applied film shall not run, streak, sag or exhibitundesirable roughness or grittiness or bubbling when dry when tested by the appropriatemethod (see Clauses 2.4.2 to 2.4.4).2.4.2 BrushingWhen thinned, if necessary, and applied to a test panel (see Clause 2.2) in accordance withAS/NZS 1580.20
38、5.1, the test paint shall exhibit satisfactory brushing properties andfreedom from defects.2.4.3 RollingWhen thinned, if necessary, and applied to a test panel (see Clause 2.2) in accordance withAS/NZS 1580.205.3, the test paint shall exhibit satisfactory rolling properties and freedomfrom defects.2.4.4 SprayingWhen thinned睷, if neces眮sary, and a抵pplied to 晸a test pane眮l (see Cla捯use 2.2) in? accordance withAS/NZS 1580.205.2 or AS/NZS 1580.205.4, as appropriate, the test paint shall exhibit goodspraying properties and not clog the sp