What are the aspects of paint performance detection?

1 The status of the newly opened original factory coating in the container, such as whether there is layering, cortical, thickening, gel, subside or clotting, and whether it can be remixed into a uniform state. The test method is a visual method, which can refer to the U.S. federal test method standard no. The status in the 3011 container in 141.
2 Dispersion fine dispersion fineness, also known as grinding fineness, is a measure of the degree of pigment dispersion in the system, refers to the prescribed conditions, obtained on the standard fineness meter reading, the reading indicates the depth of a groove somewhere, generally in the form of sm for . Small grinding fineness, indicating good dispersion, high utilization rate of pigments, strong coating cover, coating outside the sightseeing clean. National standard gb/t 1724, gb/t 6753. 1 and the international standard iso 1542 are using the scraper meter method.
3 Paint film appearance latex paint film dry after visual inspection, such as paint film flat, uniform, no pinholes, shrink holes, flow hanging, no obvious brush marks, color and standard plate difference is not obvious, gloss meet the requirements (light, half light or no light) is qualified. The appearance of paint film is an important measure of paint quality, for the color control requirements of the common color difference meter test, the test method has gb/t 11186. 1 to 3 or iso 7742-1 to 3, glossy instrument measurement methods are gb/t 9754, iso 2813 and so on.
4 ph is a measure of the concentration of hydrogen ions in the solution. During the process of coating storage, the change of ph value can indicate the stability of the coating and the change of the performance of the coating.
5 consistency (low shear viscosity) refers to the internal resistance when the fluid flows. This performance indicator is important for coating construction performance and mobility. gb/t 9626 and astm d 562 are measured with a Stommer viscosity meter. Most latex paints have a viscosity of about 150 to 300g/100r.
6 The ability to maintain its original state after freezing and subsequent melting processes (cycle tests), i.e. the ability not to suffer from the disadvantages of solidification, re-coarseness or excessive viscosity. Some latex paint viscosity will increase, as long as it does not affect its leveling and construction is acceptable. gb/t 9628 and astm 2245 are placed in a 500ml canned coating in an environment of -18C 17h, removed and placed at room temperature 7h to dissolve it, this is a cycle, the general latex paint for 1 to 5 cycles, the evaluation performance change is 0 to 10 levels, no change is good.
7 Drying time refers to the time required for a certain thickness of liquid coating film to form a solid paint film under specified drying conditions, which is determined by the coating composition and environmental conditions. Paint drying too slowly will adhere to dust, insects, etc. and make the appearance of the coating film worse, such as outdoor rain, etc. will also lead to uneven appearance. Most latex paint to reach the finger drying time l to 2h, low-light and light-free latex paint usually a few hours to more than ten hours can be repeated coating, half-light and light latex paint re-painting time is generally greater than 18h, which depends on the ambient temperature and humidity flexible grasp of the thickness of a one-time coating to control. Coatings for optimal performance, usually dry for a few days or even weeks. The measurement methods are cb/t 1728, cb/t 6753. 2, iso 1517, gb/t 9273, gb/t 9280, iso 3678, astmd 1640, etc.
8 ratio refers to the ratio of reflectivity of the same coating on a black and white substrate with a specified reflectivity. When the ratio of the pair is 0. 98 can be considered that the coating has completely covered the substrate, so the ratio to judge the coating cover force can partially eliminate manual errors. This method is suitable for white and light color coatings. gb/t 9270, gb/t 5211. 17, iso 2814, astm d 2805 are used reflector method to determine the ratio.
9 Anti-flow hanging in the vertical surface construction of the coating, due to its sticky thin, coating too thick, improper construction and other reasons caused by poor anti-flow hanging, coating film before curing occurs local flow, forming a variety of shapes of the lower edge thick uneven coating, called flow hanging. gb/t 9264, astmd 4400 can be used in different sizes of multi-tooth scraper (e.g. 50 to 275 m, 250 to 475 m, etc.) after scraping and rotating 90 degrees vertical placement, coating thin strip on top, coating thick strip under, the last one of the non-flowing film is unflowing film thickness.
10 roll splash paint value latex paint is commonly used roller coating construction, roller splash paint value is to determine the amount of paint splashing in the construction of roller coating method assessment method. Astm d 4707 collects the size and density of paint points splashed on the drawings when applied with drawings of a certain size and paint color contrast, and then compares them with standard drawings.
11 alkaline assessment of coating film resistance to alkali erosion. Latex paint is included in the alkaline index, mainly considering the effect of alkaline substances such as cement on the coating. gb/t 9265 is measured using saturated lime water impregnation, and iso also specifies a variety of media impregnation methods.
12 Brush-resistant brush resistance refers to the ability to repeatedly brush with prescribed washing media under specified conditions to maintain its non-damage. The measurement methods are gb/t 9266, Astam 2486, etc.
first, paint impact test
2nd: paint toughness test
theth: paint hardness test
fourth: paint dense test
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