Understand the national standard regulations of standard test panels for coating inspection, and correctly select test panels according to the testing items.
Materials, equipment and reagents
GB/T9756—2009 "Synthetic Resin Emulsion Interior Wall Coating" paper document;
GB/T23997-2009 "Solvent-based polyurethane wood coatings for interior decoration" paper document;
GB/T9271—2008 "Paints and varnishes standard test panels" paper documents;
Tinplate;
steel plate;
Non-asbestos fiber cement slab;
glass plate;
sandpaper;
Butyl acetate, etc.
Method and principle
GB/T9271—2008 "Standard Test Panels for Paints and Varnishes" stipulates several different types of standard test panels, and specifies the treatment method before painting. in the test method. Compared with GB/T9271-1988, this standard has changed the regulations on steel plate materials; in the method of treating steel plates, the method of treating test plates with water-based cleaning agents and phosphating test plates has been added; in the method of treating steel plates by grinding The methods of circular mechanical grinding and linear grinding have been added in . In the regulations on tinplate material, the nominal thickness was changed from 0.30mm to 0.20mm~ 0.30mm, and the regulation on the amount of locked tin was cancelled; in the method of processing tinplate, the method of treating the test plate with water-based cleaning agent was added. GB/T9271—2008 added the regulations on the materials and treatment methods of locked zinc and zinc alloy plates; in the method of processing aluminum plates, the method of cleaning the test plate with water-based cleaning agent, the treatment of the test plate with chromate conversion coating and the non-mingled plate were added. Method for treating test panels with salt conversion coating. Change the asbestos cement board to fiber-reinforced cement board, and stipulate the use of non-asbestos fiber cement board.
Measurement steps
CD carefully read GB/T9756-2009 "Synthetic Resin Emulsion Interior Wall Coatings", think carefully, and select the appropriate standard test panel for the drying time, alkali resistance, pan-alkali resistance test items of the interior wall primer, and combine GB/ T9271—2008 "Standard Test Panels for Paints and Varnishes" Perform correct test panel treatment; select appropriate standard test panels for the contrast ratio and scrub resistance test items of interior wall paint, and perform correct test panel treatment.
＠Read GB/T23997-2009 "Solvent-based Polyurethane Wood Coatings for Interior Decoration" carefully, think carefully, and test items such as pencil hardness, adhesion, impact resistance, water resistance, and yellowing resistance of the topcoat for decoration Select an appropriate standard test panel, and carry out correct test panel treatment in combination with GB/T9271-2008 "Standard Test Panel for Paints and Varnishes".
Precautions
Product standards generally stipulate the substrate and substrate treatment, which need to be read carefully.
Pay attention to the difference between GB/T9271-2008 "Standard Test Panels for Paints and Varnishes" and GB/T 9271-88.
