In our lives, polyurethane waterproof coatings are widely used. However, there are some people who are not familiar with the detection of polyurethane waterproof coatings. The following Xiaobian will take you to understand the testing content and construction requirements of polyurethane waterproof coatings. First, polyurethane waterproof coating testing content 1, paint film thickness inspection The thickness of the paint film should be measured by a needle puncture method to puncture three points per 100 square meters. The height of the paint film is measured with a ruler, and the average value is taken. The film thickness should be greater than 2 mm. Use colored markers for marking during piercing for repair. 2, fracture elongation test 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. 3, water resistance inspection 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. 4, 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. 5, 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 “8â€-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. 6, 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. Second, the construction requirements 1. The base surface is flat, clean, free from sand and loose. 2. Construction should be carried out on the basis of the first acceptance to ensure compliance with the requirements, first coating a primer, the primer must be uniform. 3. After the primer is cured, apply the brush for the second time. The direction of brushing must be perpendicular to the previous one to prevent scratching and brushing three to five times in sequence. 4. After the completion of the construction, the waterproof layer shall not be put on the person before being solidified, and the next process may not be carried out so as not to damage the waterproof layer. The above is a brief introduction for Xiaobian. If you want to know more related information, please continue to pay attention to Qijia Consulting. More exciting consultation, please stay tuned. Waterproof Coatings Toilet Waterproof Coatings Waterproof and Moisture Coatings Waterproof Coatings Brand Exterior Wall Waterproof Coatings
Littrow prisms feature 30°, 60°, and 90° angles .30° - 60° - 90° Littrow Dispersion Prisms can be used for a variety of applications. Uncoated littrow dipersion prisms are used to disperse light into its component spectrum. Coated littrow dipersion prisms are used to deviate the line of sight by 60°.
Dispersion Prisms (Uncoated)
Dispersion Prism,Optical Dispersion Prisms,Beam Deviation Prisms,Inked Dispersion Prism China Star Optics Technology Co.,Ltd. , https://www.opticsrealpoo.com
Collimated white light enters into the A-C surface of the prism, is reflected at the hypotenuse surface, and then dispersed into its component spectrum at the B-C surface. Although Littrow prisms produce narrower dispersion than equilateral prisms, Littrow prisms are typically less expensive.
Beam Deviation Prisms (Coated)
Incident light enters into the aluminum coated B-C surface of the prism at the nominal angle and returns back using the same path. In spectrum dispersion applications utilizing white light, the resolution performance of Littrow prisms is equal to equilateral prisms since the optical path length through the glass substrate is the same distance round-trip. Additionally, light entered into the A-C surface will reflect twice inside the glass substrate before being emitted through the hypotenuse surface at 60°.
