How to detect the common indicators of waterproof coatings?

1. Film thickness inspection;

The needle puncture method should be used to puncture three points per 100 square meters, measure its height with a ruler, take its average value, and the thickness of the film should be greater than 2 mm. Colored pencils should be used to make a mark during the puncture so that it can be repaired.

2. Elongation at break inspection:

In the waterproof construction, the supervisor can go to the construction site to mix the material, painted on the flat glass plate for many times (the glass plate should be waxed first), the thickness of the film is mm, after 7 days, soaked in 1% alkaline water for 7 days, and then bake for 24 hours at 50 2, do dumbbell tensile experiment, and require the extension retention rate to reach 80% (200% without treatment). If it does not meet the standard, it means that the proportion of emulsion in construction is insufficient.

3. Water resistance inspection:

The paint is painted on the cement block many times, the thickness of the film is mm, placed for 7 days, and soaked in 1% alkaline water for 7 days, without delamination and empty drumming.

Fourth, impermeability inspection:

Under certain conditions, the application of instrument testing, the method is to match the paint in proportion, painted on the glass plate for many times (the glass plate is waxed first), the thickness is mm, stand for 7 days, and then put people in the oven 50 2 bake for 24 hours, take out and place for 3 hours, do impermeable experiments, impermeability. Keeping it leak-free for 30 minutes is qualified.

If the conditions are not met, the waterproof effect can be checked by visual inspection, the method is to paint the non-woven fabric in 4 6 times, and the thickness of the film is millimeters after drying (about 24h), and the shape of the slow box is hung empty, but there must be no dead ends, and then 1% alkaline water is added to the box, and no leakage is qualified for 24h.

5. Adhesion inspection:

G-type polymer waterproof mortar, which can be directly formed into a "8" mold, and the mold will be released after 24 hours. Soak in water for 6 days, indoor temperature 25 2 dry curing for 21 days, and do bonding experiments. Waterproofing mortar type G, gray:

Water: glue = 1::, G type waterproof mortar is.

The R-type paint is mixed into a sesame paste shape, and the good paint is applied to two and a half "8" mortar blocks, and placed for 7 days to do the bonding experiment, R-type ratio (high elasticity), powder: glue = 1:; (Medium bullet), powder: glue = 1: type, greater than or equal to the adhesive index is qualified.

6. Low temperature inspection:

Wax on the glass plate, paint the paint stirred at the construction site is painted on the glass plate many times, the thickness of the film is millimeters, remove it from the glass plate after drying, and place it indoors (25 2) for 7 days, then cut off the strips with a length of 120-150 mm and a width of 20 mm, adjust the temperature of the refrigerator to -25, put the test piece in the refrigerator for 30 minutes, and wrap the front and back with a round bar with a diameter of 10 mm, and no cracks are qualified. If there is a crack, it means that the emulsion is low and the temperature is not enough.

Note: G type waterproof mortar is only for routine inspection, impermeability, and bond strength inspection. Samples should be sampled at the construction site for test pieces, and the cross method should be applied to the painted test pieces. The thickness of each pass is millimeters.

Waterproof coating test items:

Appearance, color, gloss, viscosity, fineness, specific gravity, hiding power, wear resistance, impact strength, dielectric constant, adhesion, paint film hardness, formaldehyde content and other test items.

Waterproof coating test process:

Provide product samples

Fill out the application form.

Sign the application form and service agreement and pay the full project fee.

The test is passed, the report is completed, the project is completed, and the report is issued.

[Enter the area and get the decoration for free**].

With the continuous development and change of science and technology, there are more and more types of waterproof coatings on the market today, but no matter what kind of waterproof coatings have one thing in common, that is, their solid content, low temperature flexibility and extensibility must meet the relevant standards. So, let's take you to understand what are the testing standards for waterproof coatings and the purchase skills of waterproof coatings. What are the testing standards for waterproof coatings The testing of waterproof coatings is usually based on the six major properties of thickness performance, elongation at break performance, water resistance, impermeability, adhesion performance and low temperature performance.

When testing the water resistance, the paint needs to be soaked in 1% alkaline water for a week, and if there is no delamination and hollowing after a week, it means that the paint has reached the standard. Waterproof coating purchase skills 1, the first thing to pay attention to when buying waterproof coating is environmental protection, if you buy a product that is not environmentally friendly, then after the construction of the waterproof layer is completed, under the thick floor tiles or cement, harmful gases will be slowly released. Therefore, to buy waterproof materials, we must go to the regular building materials market, and choose well-known brand products.

2. In the process of purchasing waterproof coatings, it is also necessary to pay attention to its construction operability, although some waterproof materials have good properties, but it is difficult to construct and operate, such as anti-adhesive membranes are very difficult to seal their joints. 3. The characteristics of waterproof coatings are generally divided into rigid and flexible, rigid waterproof coatings refer to cement mortar, although this kind of waterproof coating will have a high compressive penetration capacity after molding, but its extensibility is not good, if there is a slight **, the ground is broken, it is very easy to leak. The flexible waterproof coating is relatively better, because the elastoplastic of the acrylic waterproof coating will be better, and it can adapt to the partial deformation of the structure.

Article summary: The above is all about the testing standards of waterproof coatings and the purchase skills of waterproof coatings, I hope it will be helpful to you. If you want to know more about it, please stay tuned to Qeeka Home.

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1. Flexibility testing at a low temperature of -25 degrees

Wax is applied on the flat glass, the waterproof coating is prepared and painted horizontally, the interval is two hours, the thickness of the coating film is millimeters, eight hours later, the nail feels dry and is removed from the glass plate, placed in the room at a temperature of (25 2) for 7 days, and then cut off a strip of 20 centimeters long and two centimeters wide, placed under -25, put the sample into half an hour, and wrap it once with a pencil, and the one without cracks and fractures is qualified for the low temperature toughness.

2. Elongation at break inspection:

In the waterproof construction, the stirred waterproof material is painted on the waxed flat glass plate for many times, the thickness of the coating film is millimeters, after being placed for 7 days, it is soaked in about 1 alkaline water for 7 days, and then adjusted to 50 soil 2 in the incubator for 24 hours, and the dumbbell tensile test is done, and the extension retention rate is required to reach 80 (no treatment is 200, if it reaches the standard, it is qualified for the break extension inspection, and the amount of emulsion can be increased if it is unqualified.

3. Adhesion inspection:

Polymer waterproof mortar, can be directly formed into "8" mold, 24 hours after the mold. Soak in water for 7 days, indoor temperature 25 2 dry curing for 28 days, and do bonding experiments. Polymer waterproofing mortar, gray:

Water: glue = 1::, polymer waterproof mortar is.

The polymer waterproof coating is stirred to make a paste, and the good paint is coated on two and a half "8" mortar blocks, and placed for 7 days to do bonding experiments, the polymer waterproof coating ratio (high elasticity), powder: glue = 1:; (Medium shot), powder:

Glue = 1:. The low-molecular weight waterproof coating is more than or equal to the bonding index is qualified.

Fourth, impermeability inspection:

In the laboratory with a special instrument test, the method is to match the paint in proportion, painted on the waxed glass plate many times, the thickness of the brush is mm, stand for 7 days, and then put people in the oven 50 2 bake for 24 hours, take out and place for 3 hours, do impermeable experiments, impermeability. Keep 30 minutes without leakage and wet marks as qualified, you can also use visual inspection to check the waterproof effect, the method is to paint the paint on the non-woven fabric in 4-6 times, after drying (about 24h) the thickness of the film is mm, made into the shape of a shoe box, and then add 1 alkaline water to the box, no leakage after three days to qualify.

5. Water resistance inspection:

The paint is painted on the cement block many times, the thickness of the film is millimeters, placed for 7 days, and soaked in 1 alkaline water for 7 days.

6. Film thickness inspection

The needle puncture method should be used to puncture three points per 100 square meters, measure its height with a ruler, take its average value, and the thickness of the film should be greater than millimeters. Marking the puncture is made so that it can be repaired.