There are many kinds of wooden door paint products, which are endless in the market. The requirements are different. In order to express their performance, after many years of practice, various detection methods have been developed. They are tested from different angles, and the results are often different.
First, the film thickness check:
Needle puncture method should be used to puncture three points per 100 square meters, measure the height with a ruler, take the average value, and the film thickness should be greater than 2 mm. Use a marker to mark the puncture for repair.
Second, the elongation of elongation check:
In the waterproof construction, the supervisors can go to the construction site and apply the mixed materials to the flat wooden door board (the wooden door board should be waxed first). The film thickness is 1.2-1.5 mm. After 7 days, after 7 days, Immerse in 1% alkaline water for 7 days, then bake in a 50 ° C soil 2 ° C oven for 24 hours to do a dumbbell-type tensile test, requiring an elongation retention of 80% (200% without treatment). If the standard is not reached, it indicates that the proportion of emulsion blending is insufficient during the construction .
Third, water resistance check:
The paint was applied to the cement block several times, and the film thickness was 1.2-1.5 mm. It was placed for 7 days, and then immersed in 1% alkali water for 7 days without delamination.
Fourth, the watertight inspection:
Under the condition, the instrument is tested. The method is to proportionate the paint and apply it to the wooden door several times (the thickness is 1.5 mm, it is placed for 7 days, then it is baked in the oven at 50 °C ± 2 °C). After 24 hours, it was placed for 3 hours after taking out, and the impermeability test was carried out, and the water impermeability was 0.3 MPa. No leakage was observed for 30 minutes.
If the conditions are not available, the waterproof effect can be checked by visual inspection by applying the paint to the non-woven fabric 4-6 times, and after drying (about 24 h), the film thickness is 1.2-1.5 mm, which is made into a slow box shape. Hang out, but do not leave a dead angle, then add 1% alkaline water to the inside of the box, 24h no leakage is qualified.
Fifth, the adhesion check:
G-type polymer waterproof mortar can be directly formed into the "8" character mold, and the mold is released after 24 hours. Soaked in water for 6 days, indoor temperature 25 ° C ± 2 ° C dry curing for 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.
R-type paint and sesame sauce, apply the good paint to the two and a half "8" mortar blocks, place 7 days for bonding experiments, R type ratio (high elastic), powder: glue = 1: 1.4; (middle shot), powder: glue = 1: 0.8-1. The R type is 0.5 MPa, and the adhesion index is equal to or greater than the bonding index.
Sixth, low temperature compliance check:
Wax on the wooden door panel, apply the paint mixed on the construction site to the wooden door panel several times, and the film thickness is 1.2-1.5 mm. After drying, remove it from the wooden door panel and place it indoors (25 °C ± 2 °C). ) 7 days, then cut the strip 120-150 mm long and 20 mm wide, adjust the temperature of the refrigerator to -25 ° C, put the test piece in the refrigerator for 30 minutes, and wrap it with the diameter of 10 mm round bar. No cracks are acceptable. If there is a crack, the emulsion is not soft enough. [ Welcome everyone to pay attention to "Jiuzhengmen Window Network" WeChat public number: jiuzhengmenchuang attention to courtesy, scan code to send millions of business opportunities! ]
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