Waterproof paint commonly used indicators detection method

Waterproof coatings are essential for home improvement. If you accidentally buy fake or poor quality, the consequences are troublesome. Below, Xiao Bian introduced the detection methods of several commonly used indicators for waterproof materials, so that you can buy materials without any worries.

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First, film thickness inspection:

Needle puncture method should be used to puncture three points per 100 square meters. The height should be measured with a ruler. The average value should be taken and the film thickness should be greater than 2 mm. Use colored markers for marking during piercing for repair.

Second, the fracture elongation rate check:

In waterproof construction, the supervising personnel can apply the mixed material to the flat glass plate in multiple times at the construction site (the glass plate should be first waxed) to form a film thickness of 1.2-1.5 mm. After 7 days, Soaking in 1% alkaline water for 7 days, then drying in an oven at 50° C. and 2° C. for 24 hours, doing a dumbbell-type tensile test requires an extension retention rate of 80% (without treatment 200%). If it fails to meet the standard, it means that the proportion of the emulsion in the construction is insufficient.

Third, the water resistance check:

The paint was applied on the cement block several times and the thickness of the film was 1.2-1.5 mm. It was placed for 7 days and soaked in 1% alkali water for 7 days. No delamination was allowed, and blanking was not acceptable.

Fourth, impermeability inspection:

Under certain conditions, the application of equipment testing, the method is to paint the proportion of good, divided several times brushing on a glass plate (glass plate first waxing), a thickness of 1.5 mm, put for 7 days, and then put the oven Within 50 °C ± 2 °C bake for 24 hours, remove and place for 3 hours, do impervious test, impermeability 0.3MPa. Keep leak free for 30 minutes.

If the conditions are not available, the waterproof effect can be checked by visual inspection. The method is to paint the paint 4-6 times onto the non-woven fabric. After drying (about 24h), the film thickness is 1.2-1.5mm, making a slow box shape. Hang the air, but no dead space is left. Add 1% alkali water to the box, and no leakage is qualified after 24 hours.

Fifth, adhesion inspection:

G-type polymer waterproof mortar, can be directly formed "8" pattern, 24 hours after the mold. Put people soaked in water for 6 days, room temperature 25 °C ± 2 °C dry curing 21 days, do bonding experiments. G-type waterproof mortar, ash: water: glue = 1:0.11:0.14, G-type waterproof mortar is 2.3 MPa.

Apply R-type paint and sesame paste and apply the good paint to two half-size “8”-shaped mortar blocks and place it for 7 days to make bonding experiments. R-type ratio (high elasticity), powder: glue=1: 1.4; (in the bullet), powder: glue = 1:0.8-1. The R type is 0.5 MPa, which is greater than or equal to the bonding index.

Six, low temperature compliance check:

Wax the glass plate, and paint the paint on the construction site several times on the glass plate to form a film thickness of 1.2-1.5 mm. After drying, remove it from the glass plate and place indoors (25°C±2°C) ) 7 days, then cut 120-150 mm long, 20 mm wide strips, the refrigerator temperature was adjusted to -25 °C, the test piece was placed in the refrigerator for 30 minutes, with a diameter of 10 mm round rods are wound each time No crack is acceptable. If there is a crack, it indicates that the emulsion has insufficient flexibility.

Note: G-type waterproof mortar is only used for routine inspection, water impermeability and bond strength inspection. Samples should be sampled at the construction site to make test strips. The cross-cut method should be applied to the brushing test strips. The thickness of each film is 0.25-0.35 mm.

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