Coating process: coating freeze-thaw resistance

Core hint: it is suitable for testing the waterborne paint with synthetic latex or synthetic resin emulsion as the paint After freezing and thawing, it has the test method of viscosity, anti coalescence, anti caking and scratch 1、 Instrument: Freezer: a suitable box, the size of which shall be able to hold several test samples, and the temperature in the box shall be kept at - 18 ± 2 ℃ Test board: board with smooth surface of adjacent black and white area, covered with varnish, so that the surface can be evenly coated with paint film, and will not penetrate paint liquid Also available in black and white Shenyang steel structure fireproof coating construction expert punde Building Fire Engineering Co., Ltd Recommended introduction: since its establishment, Shenyang punde Construction Fire Engineering Co., Ltd has cultivated a group of professional construction teams with excellent equipment, rich experience and serious responsibility with advanced and scientific management methods and strict engineering quality assurance and after-sales service system It has undertaken a number of fire system installation projects, which has been praised by customers Every idea and special requirement of you will be fully considered by us and fully realized in the construction technology, which will become the cornerstone of our successful long-term development We are looking forward to your invitation, to provide you with quality services and high-quality technical support! All construction coatings have passed ISO9001 Coatings home: it is suitable for testing waterborne paints with synthetic latex or synthetic resin emulsions as the paint After freezing and thawing, the test methods of viscosity, anti coalescence, anti caking and scratch have no damage and maintain the original performance 1、 Instrument: Freezer: a suitable box, the size of which should be able to hold several test samples, and the temperature in the box should be kept at - 18 ± 2 ℃ Test board: board with smooth surface of adjacent black and white area, covered with varnish, so that the surface can be evenly coated with paint film, and will not penetrate paint liquid Glass plates with black and white areas, such as those specified in GB 1726, can also be used Viscometer: a Stormer viscometer with a paddle rotor Paint brush: 25 mm wide soft bristle brush 2、 Samples shall be prepared according to GB 3186 1 After the sample to be tested is stirred evenly, it shall be put into the lined material with a volume of 500ml, the iron tank with a sealed cover, or the large mouth glass bottle or plastic bottle with a sealed cover, the amount of which shall be 2 / 3 of the container The container shall be clean, and the cover shall be timely closed to prevent evaporation loss 2 Two identical samples shall be prepared for each paint solution to be tested 3、 Test 1 Use ordinary stainless steel paint knife to mix the test sample in the container by hand (be careful when mixing to avoid bubbles) Then determine the initial viscosity according to GB 9269 After the test, the sample shall be sealed tightly, marked with "reference sample", and stored at 23 ± 2 ℃ 2 After mixing another sample of the same sample as required, mark "test sample" and put it into the freezer The temperature of the freezer shall be kept at - 18 ± 2 ℃ The sample tank shall not be in contact with the wall or bottom of the box There shall be a gap of at least 25 mm between the adjacent sample tanks and between the sample tank and the box wall to facilitate the free circulation of air around the sample (the sample tank can be placed on the rack) Take out the sample tank after it is placed in the freezer for 17h, and place it at 23 ± 2 ℃ Note: during the whole mixing process, the comparison sample and the test sample should be treated exactly the same 4、 Test and result evaluation 1 Take the test sample out of the freezer, and place it for 6h and 48h for inspection and evaluation respectively 2 Before mixing the test sample, observe and evaluate the sedimentation, cementation, coalescence, caking and other conditions of the sample in the container, expressed as "no change", "slight" or "serious" 3 Stir and measure the viscosity of the test sample as specified 4 After viscosity measurement, immediately brush the reference sample and test sample on the same test plate (see 3.2) with a clean soft bristle brush, dry for at least 24 hours, then compare the test sample and the reference sample, and visually observe and record the change of covering power, luster, condensation, spot and color of the dry paint film Home of coatings is specialized in coatings, diatom mud, paint coating, coating technology, fire retardant coating news and coating, diatom mud, paint coating, coating technology, fire retardant coating decoration knowledge and decoration renderings,