Views:4 Author:Site Editor Publish Time: 2021-03-08 Origin:Site
In view of the polyurethane high-pressure foaming machine material with strong soluble carbamate groups, adjusting the ratio of NCO/OH in the secret recipe can prepare different substances of thermosetting plastic polyurethane material and thermoplastic polyurethane. According to its molecular formula, it can be divided into two types: linear type and body type. Because of the different crosslinking densities, the body structure can be hard, soft or somewhere in between, and has the characteristics of high strength, high wear resistance, and solvent resistance. What are the basic requirements for polyurethane foaming machines for polyurethane?
1. The moisture-proof rural base layer of polyurethane material should be wiped with 1:3 mixed mortar to a 1/50 flooding gradient according to the design regulations, and the surface layer should be smoothed and polished, and pits, pits, shedding, sanding and ashing are not allowed And other shortcomings. The water outlet or the odor-proof floor drain should be lower than the entire ground for waterproofing to facilitate the removal of water. The location of the pipeline with waterproof casing should be more than 20mm higher than the surface layer of the rural base. The position of the positive angle line should be made into a small rounded corner with a radius of 10 mm to facilitate the construction of exterior wall paint.
2. All pipe fittings, sanitary facilities, anti-odor floor drains or water outlets must be installed firmly, the joints are tight, the closing is round, and there should be no falling off.
3. During the construction of the project, when the traditional polyurethane waterproof exterior wall coating is constructed, the moisture-proof rural base should be basically in a dry state, and the moisture content should be less than 9%. The simple method of measurement is to set the area to 1m² and the thickness to be 1.5-20mm The rubber mat is covered on the rural grass-roots level and left for 2 to 3 hours. For example, the covered rural grass-roots surface layer is a high-definition large image, and the rubber mat close to the rural grass-roots side has no condensation watermark. According to work experience, it is explained in detail that its water content has been Less than 9%, in line with engineering construction regulations. The 911 type polyurethane coating produced by our company does not have this requirement. As long as there is no clear water in the rural grassroots, the project can be constructed.
4. Before construction, use a shovel and a broom to remove small hard spots, mortar rashes and other foreign objects on the surface of the rural grassroots level, and completely remove the dust and dirt. It is necessary to carefully remove the sun angle line, the root of the pipe, the odor-resistant floor drain and the drain ditch. If there is oil stains, rust, etc., use copper wire brushes, sandpaper and high boiling point solvents to completely eliminate them. tidy.