A, polyurethane waterproof coating construction technology
1. grass-roots treatment: the foundation house must be flat, firm, clean and free from water and oil pollution. The angle of yin and yang should be made into an arc. The original cracks, protruding waterproof layer and dust should be removed from the old roof, the damaged parts of the depression should be leveled, and the leak-proof parts should be blocked first. The base should be flat and free from open water. Special parts such as impinges mouth and frame joint should be flexibly sealed first; The general painting procedure starts from the angle of yin and yang, then the vertical plane, and finally the large-scale construction.
2. Coating: rolling, scraping and brushing can be used for construction, and thin-layer coating method should be adopted for many times. Each coating should not be too thick, generally divided into 3-4 times, with a total thickness of 1.5-2.0cm. After the coating dries and becomes a film, the coating should be applied. The weak link should be laid with matrix reinforcement.
3. After the surface of each coating is dried, the construction quality inspection shall be carried out, such as missing coating and bulging, which will be repaired.
Second, the polyurethane waterproof coating formula
Emulsion 100 kg water 300 kg defoamer 0.5 kg preservative 1 kg. The disperser was stirred uniformly at a speed of 300 rpm for 20 minutes. Powder composition: 425 cement 50 kg 200 mesh quartz stone 30 kg 80 mesh quartz stone 20 kg. The dry powder mixer is stirred for 30 minutes. Proportion: liquid: powder = 1:2.77. Construction can be carried out by stirring evenly, not too thick or too thin. If it is too thick or too thin, the emulsion manufacturer, the ratio of cement to quartzite and the mesh number of quartzite can be adjusted.
Waterborne polyurethane coatings have excellent comprehensive properties, high fullness and film hardness as high as? 1.5-2H？ Wear resistance even exceeds that of oily paint, and it has obvious advantages in service life and color matching. It is an advanced product in water-based paint. Only a few professional companies in the world have mastered technology. In China, only Dongguan Dingyuan Industrial Co., Ltd. took the lead in completing the localization of this core technology and has a national invention patent.
In addition, there is a waterborne wood paint with acrylic acid as the main component. Its main characteristics are good adhesion, which will not deepen the color of wood, but poor wear resistance and chemical resistance, and soft film hardness. What are the pencil rules? HB？ , the fullness is poor, the comprehensive performance is average, and the construction is prone to defects. Because of its low cost and low technical content, it is the main product that most water-borne coatings enterprises push to the market. This is also the reason why most people think that water-based paint is not good. Its advantage is that it is cheap.
The above recommendation is about the construction technology of polyurethane waterproof coating and the matching of formula and material ratio. Therefore, the suitable and reasonable polyurethane waterproof coating refers to the waterborne polyurethane coating, which has superior comprehensive performance, high fullness, better hardness and wear resistance than paint, and has humanized characteristics in service life and color matching, for example, it can help beautify the wall. This also helps to further improve the life of the wall. Interested consumers and friends take a look at the above. Through the example of Bian Xiao, we can get a more reliable scheme compared with the actual situation, and I believe we can achieve satisfactory results.