Coating knowledge: five common testing methods of waterproof coating index testing

Core tips: 1 Inspection of film-forming thickness: puncture three points every 100 square meters with needle puncture method, measure its height with ruler, take its average value, and the film-forming thickness should be greater than 2 mm When puncturing, color pen should be used to mark for repair 2、 Inspection of fracture elongation rate: in the waterproof construction, the supervisor can go to the construction site to brush the mixed materials on the flat glass plate several times (the glass plate should be waxed first), the film thickness is 1.2-1.5mm, after 7 days, soak in 1% alkaline water for 7 days, then bake in a 50 ℃ soil 2 ℃ oven for 24 hours, and do dumbbell type tensile test, and the elongation retention rate is required to reach 80% (no place) reason Which is the price of Dajin diatom mud Recommended brief introduction: which is the price of Dajin diatom mud? How to buy genuine diatom mud? Guangdong diatom mud agent suggests placing a basin of cold water in the air conditioning room, so that the diatom mud wall can breathe effectively The feature of the breathing wall is obvious When the indoor air is dry, the diatom mud wall will release the absorbed water quickly Put it out to help regulate the indoor dry humidity It is suggested to place a basin of cold water in the air conditioning room, so that the wall of diatom mud can breathe effectively The feature of the wall that can breathe is obvious When the indoor air is relatively dry, the wall of diatom mud will absorb the water Coating home news: 1 Film thickness inspection: three points shall be punctured every 100 square meters by needle puncture method, and the height shall be measured with ruler, and the average value shall be taken The film thickness shall be greater than 2 mm When puncturing, color pen should be used to mark for repair 2、 Inspection of fracture elongation rate: in the waterproof construction, the supervisor can go to the construction site to brush the mixed materials on the flat glass several times The thickness of film-forming on the plate (the glass plate shall be waxed first) is 1.2-1.5mm After 7 days, it is soaked in 1% alkaline water for 7 days, and then it is dried in an oven at 50 ℃ and 2 ℃ for 24 hours The dumbbell type tensile test is carried out, and the elongation retention rate is required to reach 80% (200% without treatment) If the standard is not up to standard, it is indicated that the proportion of emulsion in the construction is insufficient (this method is only limited to ordinary two-component coating) III water resistance inspection: the coating is painted on the cement block several times, with film thickness of 1.2-1.5mm, placed for 7 days, immersed in 1% alkali water for 7 days, without layering or hollowing, it is qualified 4、 Water impermeability inspection: under certain conditions, the instrument is used for inspection The method is to prepare the coating in proportion and brush it on the glass plate several times (the glass plate is waxed first) The thickness is 1.5mm Put it in the oven for 7 days, and then put it in the oven at 50 ℃ ± 2 ℃ for 24 hours Take it out and put it for 3 hours to do the water impermeability test The water impermeability is 0.3MPa It is qualified if there is no leakage within 30 minutes If the conditions are not met, visual inspection can be used to check the waterproof effect The method is to brush the coating on the non-woven fabric in 4-6 times After drying out (about 24 hours), the film thickness is 1.2-1.5 mm, which is made into the shape of a slow box and hanging empty, but no dead angle is allowed Add 1% alkali water into the box, and it is qualified if there is no leakage in 24 hours Five Low temperature flexibility inspection: wax the glass plate, and paint the mixed coating on the glass plate for several times at the construction site, with the film thickness of 1.2-1.5 mm After drying, remove it from the glass plate, place it indoors (25 ℃± 2 ℃) for 7 days, then cut the strip shape of 120-150 mm in length and 20 mm in width, and refrigerate it Adjust the temperature to - 25 ℃, put the test piece in the refrigerator for 30 minutes, and wind it with a round bar with a diameter of 10 mm in both positive and negative directions once, and it is qualified if there is no crack If there is a crack, the low temperature flexibility of the emulsion is not enough 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,