Paint knowledge | six paint index testing methods help you to quickly select satisfactory paint

Core tip: Nowadays, when consumers choose coatings for decoration, they first need to be green and environmentally friendly In addition, whether the water resistance and adhesion of the coatings meet the standards can not be ignored The following six experimental methods can help you quickly select a satisfactory coating 1 Film thickness inspection: needle puncture method shall be used to puncture three points every 100 square meters, and the height shall be measured with a 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 plate (the glass plate should be waxed first) for many times to form a film Which is the price of Dajin diatom mud Recommended brief introduction: which is the price of Dajin diatom mud? 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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 Home of coatings news: at present, when consumers choose coatings for decoration, they first need to be green and environmentally friendly In addition, whether the water resistance and adhesion of the coatings meet the standards can not be ignored The following six experimental methods can help you quickly select the satisfactory coatings 1、 Film forming thickness inspection: puncture three points every 100 square meters with needle puncture method, measure its height with ruler, take its average value, 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 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 3、 Water resistance inspection: paint on the cement block in several times, with film thickness of 1.2-1.5mm, placed for 7 days, immersed in 1% alkali water for 7 days, no stratification, no hollowing 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 5、 Adhesion inspection: G-type polymer waterproof mortar can directly form the "8" shaped formwork, and the formwork will be released 24 hours later Immerse in water for 6 days, dry cure at 25 ℃± 2 ℃ for 21 days, and do bonding test G type waterproof mortar, ash: water: glue = 1:0.11:0.14, G type waterproof mortar is 2.3mpa The R-type coating and the sesame paste like coating are applied to two half "8" shaped mortar blocks, which are placed for 7 days for bonding experiment The R-type ratio (high elasticity), powder: glue = 1:1.4; (shot in), powder: glue = 1:0.8-1 R type is 0.5MPa, and it is qualified if it is greater than or equal to the bonding index 6、 Low temperature flexibility inspection: wax the glass plate, brush the coating mixed at the construction site on the glass plate several times, with the film thickness of 1.2-1.5mm, remove it from the glass plate after drying, place it indoors (25 ℃± 2 ℃) for 7 days, then cut the strip of 120-150 mm long and 20 mm wide, 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 Note: G-type waterproof mortar is only subject to routine inspection, water impermeability and bond strength inspection The samples shall be sampled at the construction site to make test pieces, and the cross method shall be used for brushing test pieces The thickness of each coating is 0.25-0.35mm 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,