Detail of TJ/CL 252.2-2012

Introduction of TJ/CL 252.2-2012

Technical Specification for Water Soluble Paints (Both Priming and Finishing Paints) for Use on Railway Wagons (Provisional) 铁路货车用水溶性油漆(底面合一) 技术条件(暂行) 1. Scope This technical specification specifies the technical requirements, test methods, inspection and reinspection rules, packaging, marking, transportation and storage, and construction technological requirements of water soluble paints (both priming and finishing paints) for use on railway wagons. This technical specification is applicable to the water soluble paints (both priming and finishing paints) for use on railway wagons. 2. Normative References The referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition (including all amendments) of the referenced document applies. GB/T 1725-2007 Paints Varnishes and Plastics - Determination of Non-volatile-matter Content GB/T 1727-1992 Methods of Producing Films of Paints, Varnishes, Lacquers and Related Products on Test Panels GB/T 1728-1989 Methods of Test for Drying Time of Coatings of Paints and Putties GB/T 1732-1993 Determination of Impact Resistance of Film GB/T 1733-1993 Determination of Resistance to Water of Films GB/T 1735-2009 Paints and Varnishes - Determination of Heat Resistance GB/T 1766-2008 Paints and Varnishes - Rating Schemes of Degradation of Coats GB/T 1771-2007 Paints and Varnishes - Determination of Resistance to Neutral Salt Spray (Fog) GB/T 3186-2006 Paints Varnishes and Raw Materials for Paints and Varnishes - Sampling GB/T 6742-2007 Paints and Varnishes - Bend Test (Cylindrical Mandrel) GB/T 6753.1-2007 Paints Varnishes and Printing Inks - Determination of Fineness of Grind GB/T 9264-1988 Test Method for Sagging of Paints GB/T 9268-2008 Determination of Freeze-thaw Resistance of Latex and Emulsion Paints GB/T 9278-2008 Temperatures and Humidities for Conditioning and Testing of Paint Specimens GB/T 9286-1998 Paints and Varnishes - Cross Cut Test for Films GB/T 9750-1998 Marks for Package of Coating Products GB/T 9753-2007 Paints and Varnishes - Cupping Test GB/T 13452.2-2008 Paints and Varnishes-Determination of Film thickness GB/T 13491-1992 General Rule for Packing of Coatings GB/T 14522-2008 Artificial Weathering Test Method for Plastics, Coating and Rubber Materials Used for Machinery Industrial Products - Fluorescent UV Lamps HG/T 2458-1993 General Rules for the Inspection, Transportation and Storage of Paint Products TB/T 2707-1996 Technical Specification for Alkyd Paste Paint for Use on Railway Wagons TB/T 2879.4-1998 Paints and Coatings for Railway Locomotive and Rolling Stock - Part 4: Technical Specification for Protection and Coating of Wagons ASTM D 3960-2005 Standard Practice for Determining Volatile Organic Compound (VOC) Content of Paints and Related Coatings 3. Technical Requirements The product properties shall be in accordance with those specified in Table 1. Table 1 Property Indexes No. Item Unit Technical requirement Description 1 Color and appearance of film The film color shall meet the requirements of the technical specification for vehicles and the film shall be flat, smooth and mellow and full Visual inspection 2 Non-volatile-matter content % ≥50 3 VOC content g/l ≤150 4 Viscosity (3# rotor, 6 rpm) Pa·s ≥2.0 5 Sagging μm Wet film shall not sag within scope of 200μm 6 Fineness μm ≤45 7 Drying time Surface dry h ≤1 Complete dry h ≤16 8 Cross cut test Grade ≤1 With a spacing of 1mm 9 Bending property mm ≤2 10 Impact resistance cm ≥50 11 Cupping test mm ≥5.0 12 Heat resistance (150℃±2℃, 4h) Shall be free from foaming, shedding, cracking and wrinkling 13 Water resistance (48h) Shall be free from foaming, wrinkling and shedding Slight discoloration and fading are allowable 14 Freeze-thaw stability The paint shall be free from obvious pig shin as well as settling, gelling and caking phenomena 15 Resistance to salt spray (fog) (720h) Shall be free from foaming, rusting and shedding, and the unidirectional expanding corrosion at scratch shall be less than or equal to 2mm 16 Resistance to artificial weathering (200h) Shall be free from foaming, shedding, cracking and rusting. The discoloration shall be less than or equal to Grade 3 and the pulverization shall be less than or equal to Grade 2 4. Test Methods 4.1 Temperature and humidity values for conditioning and testing of specimens According to those specified in CB/T 9278-2008, the templates for resistance to salt spray (fog) and resistance to artificial weathering shall be tested after being dried for 14d, and the templates for other properties shall be tested after being dried for 7d. 4.2 Paint preparation The paint shall be prepared according to the method stated in GB/T 1727-1992, and the determination of dry film thickness shall be carried out according to those specified in GB/T 13452.2-2008, see Table 2. Table 2 Preparation of Test Templates Inspection item Type of substrate Dimensions of substrate (mm) Requirements for coating Color and appearance of film Drying time Impact resistance Cross cut test Bending property Heat resistance Tinplate 120×50×(0.2~0.3) One layer of paint shall be coated and the dry film thickness shall be 45μm±5μm Sagging Glass plate 200×120×(2~3) Cupping test Steel plate 150×70×(0.3~1.25) One layer of paint shall be coated and the dry film thickness shall be 45μm±5μm Water resistance Steel plate 150×70×(0.8~1.5) One layer of paint shall be coated and the dry film thickness shall be 45μm±5μm Resistance to salt spray (fog) Steel plate 150×100×(0.8~1.5) Two layers of paint shall be coated, the dry film thickness of these two layers shall be basically consistent, and their total dry film thickness shall be 110μm±10μm Resistance to artificial weathering Steel plate 150×70×(0.8~1.5) 4.3 Color and appearance of film This item shall be visually inspected. 4.4 Drying time According to those specified in GB/T 1728-1989, the surface dry shall be tested by adopting with Method A among the methods for determination of surface drying time and the complete dry shall be tested by adopting with Method B among the methods for determination of complete drying time. 4.5 Viscosity The determination of viscosity shall be carried out according to those specified in TB/T 2707-1996. The viscosity of double-component paint shall be tested after these two components are mixed in proportion. 4.6 Fineness The determination of fineness shall be carried out according to those specified in GB/T 6753.1-2007. 4.7 Non-volatile-matter content The determination of non-volatile-matter content shall be carried out according to those specified in GB/T 1725-2007. 4.8 Sagging The determination of sagging shall be carried out according to those specified in GB/T 9264-1988. 4.9 Bending property The determination of bending property shall be carried out according to those specified in GB/T 6742-2007. 4.10 Impact resistance The determination of impact resistance shall be carried out according to those specified in GB/T 1732-1993. 4.11 Cross cut test This test shall be carried out according to those specified in GB/T 9286-1998, with a spacing of 1mm. 4.12 Cupping test This test shall be carried out according to those specified in GB/T 9753-2007. 4.13 Heat resistance The determination of heat resistance shall be carried out according to those specified in GB/T 1735-2009. 4.14 VOC content The determination of VOC content shall be carried out according to those specified in ASTM D 3960-2005. 4.15 Freeze-thaw stability The determination of freeze-thaw stability shall be carried out according to Method B as specified in GB/T 9268-2008.

Contents of TJ/CL 252.2-2012