What are the performance testing standards for waterproof coatings?
1.Gentle and gentle.
Wax the glass plate, and paint the mixed waterproof paint on the glass plate several times with a film thickness of 121.5 mm. After drying, remove from the glass plate, place it indoors (25 2) for 7 days, then cut a strip with a length of 120 150 mm and a width of 20 mm, adjust the refrigerator temperature to 25, put the specimen in the refrigerator for 30 minutes, and use a diameter of 10 If there are no cracks, it is qualified.
2.Adhesion.
Type G polymer waterproofing mortar can be directly molded into "8" type, which can be formed after 24 hours. Soak in water for 6 days, dry and cure at room temperature 25 2 for 21 days, and do the bonding test. The ratio of G-type waterproofing mortar is gray: water: glue = 1:11:14. Type G waterproofing mortar is 23 m pa。
Adjust the R-type paint into sesame paste, apply the adjusted paint on the two halves of the mortar block "8", place it for 7 days for bonding test, mix according to R-type (high elasticity), powder: glue = 1:14。Injection), powder: rubber = 1:8-1 ratio. R-type 05MPa, the adhesion index is greater than or equal to qualified.
3.Water resistance.
The waterproofing coating is applied to the cement block in batches. The thickness of the coating is 12—1.5 mm. Let stand for 7 days. Add 1% and soak in alkaline water for 7 days. If there is no layering or hollowing, it is qualified.
4.Elongation at break.
First, apply the stirred waterproof coating to the flat glass several times (the glass needs to be waxed first), and the film thickness is 12-1.5 mm, let stand for 7 days, soaked in 1% alkaline water for 7 days, then incubated at 50 for 24 hours in an oven at 2°C, and do a dumbbell tensile test. Without treatment, elongation is required to reach 80% and 200%.
5.Film thickness.
3 acupuncture points per 100 square meters were punctured by acupuncture, and the height was measured with a ruler, and the average membrane thickness should be greater than 2 mm.
6.Impermeability.
If conditions permit, the instrument detection method should be to mix the waterproof coating in proportion, brush it on the glass plate several times (the glass plate needs to be waxed first), and the thickness should be 15 mm, let stand for 7 days, then put in the oven at 50 2 for 24 hours, take it out and let it stand for 3 hours, and do a waterproof test. Impermeability is 03MPa, no leakage for 30 minutes is qualified.
If the conditions are not perfect, the waterproof effect can be tested by visual inspection. The method is to divide the waterproofing paint into 4 parts - brush 6 times on the non-woven fabric and dry thoroughly (about 24 hours). The film thickness is 12—1.5 mm, slow to make. Hang it in the shape of a box, but no dead spaces are allowed. Then add 1% alkaline water to the box, and it will not leak for 24 hours. is qualified.