the product introduction:
Self-closing tester is used for the performance test of waterproof coating film under the action of water, physical and chemical reaction to make the film crack self-healing and sealing. It is suitable for the self-closing test of polymer cement waterproof coating.
Second, the working principle:
Under the test conditions, the polymer cement waterproof coating film is cracked by a prescribed method, and the crack of the test piece is subjected to a predetermined water pressure. Report the water seepage to the seepage stop time from the crack in the test piece.
Third, technical parameters:
♦Connecting tube: 90°, diameter 110mm
♦ Glass tube: diameter 50mm, length 300mm
♦Connecting tube center distance to platen height: 200mm
为1. 5_2. 2mm。按照规定的方法养护、干燥。
ourth, the operation steps
♦ Cut the PP film into a 106mm test piece, and cut a 10*4mm U-shaped mouth with a blade at its center position, and then use one.
A small piece of tape is fixed, and the polymer cement waterproof coating sample mixed according to the specified ratio is applied to the other side of the PP film to make the coating thickness.
2mm。 2mm. Cured and dried according to the prescribed method.
The smear is 0. 5mm
A thick wallpaper knife cuts a 5 mm long crack at the center of the exposed film.
♦ Install the prepared test piece in the middle of the pressure plate and the communication pipe in the horizontal direction of the connecting pipe, and the coated surface faces the water-facing direction to make the pressure
The plate is fixedly pressed and sealed with a sealant at the joint.
♦ Install a pressure plate with a glass tube in the vertical direction of the connecting pipe and seal it with a sealant at the joint between the connecting pipe and the pressure plate.
♦ Add 23 ° C clean water to the glass tube to make the liquid level to the center height of the test piece is 300 ram, and then make the liquid during the test.
Keep the same height on the surface, observe the water seepage at the crack of the test piece, and record the time from the water injection to the time when the crack does not seep.
♦ After the test, the test piece is placed under standard conditions for 24 hours, and the crack is observed to be closed. If the crack is closed, the test is carried out.
V. Test results
♦ Perform two parallel tests and report the results of the two tests and the average value to the nearest hour.
♦ If the following conditions occur, the test is invalid and should be retested.
♦ No drip is formed at the crack of the coating film at the beginning of the test, and water spray appears.
♦ From the beginning of the test to the crack of the test piece, the water seepage time is less than 2 hours.