the product introduction:
The instrument is mainly used for detecting the hydrophobicity test of thermal insulation products such as perlite, mineral wool, polystyrene foam and rigid polyurethane foam. Place the sample at a 450-degree angle with the horizontal position. The center of the sample is located at the position given below the nozzle. Spray the sample with a certain flow of water for a specified time. Calculate the test by measuring the change in the mass of the sample before and after spraying. The volume fraction of the unpermeable portion of the sample.
Second, technical parameters:
1) Hydrophobic tester
a. Watering device: It consists of a metal nozzle, a glass rotor flowmeter and a regulated water source, and is connected by a rubber tube in the middle. The center of the metal nozzle is located on the longitudinal symmetry plane of the test surface and can be moved on the sample holder. The glass rotor flowmeter has a flow range of 10-100 L/h and an accuracy of 2.5.
b. Sample holder: The sample holder is placed at a tilt angle of 450 on a support that can be adjusted horizontally.
c. Metal nozzle: The water spray surface is convex and round. 19 holes of Φ0.9 mm were uniformly distributed thereon, and when the head was tested at the position specified in Fig. 1, the lateral dimension of the sample to be exposed was 148 mm.
2) Balance: The minimum division value is not more than 0.5% of the weighed mass.
3) Drying box.
4) Thickness gauge: pressure plate pressure 98Pa, graduation value 0.1mm
5) Vernier caliper: measuring range 0-150mm, graduation value 0.02mm.
6) Steel ruler: measuring range 0-300mm, graduation value 1mm.
7) Dimensions: 410X205X590mm
8) Weight: 13.5kg
Third, the operation steps:
★ Place the sample in a dry box and dry to a constant weight at a temperature of 105 ± 50 °C. When the sample is easily deformed at this temperature or contains a volatile and easily changeable component, it can be dried to a constant weight at 60 ± 50 C or less than the volatilization temperature of 5 - 100 °C. Weigh the mass m1 of the sample.
★ Measure the size of the sample after drying. For the plate-like products, the measurement of the length and width was carried out on both the front and back sides of the sample, and each test was performed 4 times, and the reading was accurate to 1 mm. The thickness of the soft product is measured by a thickness gauge. The thickness of the hard product is measured by a vernier caliper, and the points are evenly measured along the length of the sample, and the reading is accurate to 0.1 mm. The measurement of the inner and outer diameter of the tubular product shall be carried out at both ends of the specimen, and each test shall be carried out at four locations. The length is measured twice. The reading is accurate to 1mm. The measurement results of each size of the sample were averaged. Calculate the thickness (or wall thickness) and volume of the sample.
★ Place the sample on the hydrophobic side tester (for the sample treated with water on one side, the water repellency on both sides should be measured separately. For the plate-shaped product, the position of the nozzle should be adjusted according to the thickness of the sample to make it Meet the requirements of Figure 1. For tubular products, the inner surface should be downward, adjust the position of the nozzle, so that the upper part of the sample is evenly drenched, adjust the water flow, stabilize it at 1L/min, continuously spray for lh, then Remove the sample, quickly absorb the surface water droplets with crepe paper, and immediately weigh the mass m2 of the sample.
Fourth, the sample:
The size of the plate-shaped product sample is 300 mm * 150 mm, and the thickness is the original thickness of the product. The tubular product sample is 300 mm long, has a semi-annular or fan-shaped cross section, and the wall thickness is the original wall thickness of the product. When preparing the sample, the sample should be representative as much as possible. Do not sample from the part with wrinkles or surface damage. Foam products should be removed from the skin.
Five, the principle:
Place the sample at a 450-degree angle with the horizontal position. The center of the sample is located at the position given below the nozzle. Spray the sample with a certain flow of water for a specified time. Calculate the test by measuring the change in the mass of the sample before and after spraying. The volume fraction of the unpermeable portion of the sample.