Common knowledge of coating: analysis of the key points in the construction of polyurethane ceramic tile facing technology for external wall spraying

Key tips: 1 Key points of construction 1 Construction preparation The base wall shall meet the requirements of code for acceptance of construction quality of concrete structure engineering (GB50204-2002), code for acceptance of construction quality of masonry engineering (gb50203-2002) and corresponding base wall quality acceptance specifications and pass the acceptance The performance index of polyurethane shall meet the requirements of JC / t998-2006 spraying polyurethane rigid foam thermal insulation material The wall surface shall be cleaned without oil stain or floating ash Construction holes, scaffold holes, balcony plates and walls are missing Paint agent, top 10 Chinese wall paint brands Recommended introduction: interior wall paint and exterior wall paint can achieve beautiful, clean and pleasant effects, but the effects in different environments are different, so the color of the paint will be different There are ten brands of Chinese paint, ten brands of global paint, ten brands of Chinese wall paint, and ten brands of Chinese paint, Famous trademark of Chinese paint and coating In private rooms, most of us choose according to our own personality, personal hobbies and living habits The younger generation will choose the interior wall paint with rich colors and bright colors, while the older ones will have some working experience Home of coatings: 1 Key points of construction 1 The base wall for construction preparation shall meet the requirements of code for acceptance of construction quality of concrete structure engineering (GB50204-2002), code for acceptance of construction quality of masonry engineering (gb50203-2002) and corresponding base wall quality acceptance specifications and pass the acceptance The performance index of polyurethane shall meet the requirements of JC / t998-2006 spraying polyurethane rigid foam thermal insulation material The wall surface shall be cleaned without oil stain or floating ash The construction holes, scaffold holes, balcony plates and wall defects shall be repaired with mortar; the loose and weathered parts of the wall shall be removed The flatness error of the base wall surface shall not exceed 3mm 2 Environmental requirements: A during the construction, the weather shall meet the following conditions: the ambient temperature during the field spraying operation shall be 15 ℃ - 40 ℃, but not lower than 10 ℃ or higher than 40 ℃; the water content of the wall shall be 9%, the relative humidity of the wind shall be less than 80%, and the construction shall not be carried out in rainy days When the ambient temperature during construction is lower than 10 ℃, reliable technical measures shall be taken to ensure the spraying quality Do not work under high humidity or exposure to the sun b The technical conditions for construction and operation of external insulation are as follows: single row or double row steel tube scaffold and steel tube gantry scaffold along the external edge; the distance from the wall decorative surface shall be (00-2.5m), and the maximum distance shall not exceed 5m; the enclosure railings not more than 1.2m shall be set; the construction must conform to the current national safety technical regulations The erection of scaffold shall meet the progress requirements of spraying c Polyurethane white materials and black materials shall be stored in a dry, ventilated and cool place in a sealed manner The storage temperature of white materials shall be 15 ℃ ~ 20 ℃, and shall not exceed 30 ℃, and shall not be exposed to the sun The storage temperature of black material should be 15 ℃ ~ 35 ℃, not more than 35 ℃, and the minimum storage temperature should not be less than 5 ℃ The storage period of polyurethane white material and polyurethane black material (source: China heat preservation network) is 6 months Polyurethane white and black materials shall be protected from sun during storage and transportation 2、 The wall surface of base course treatment shall be cleaned, the oil stain shall be cleaned and the floating ash shall be removed The loose and weathered parts of the wall shall be removed The flatness of the wall shall be controlled below ± 3mm If the deviation of the base course is too large, the mortar shall be plastered for leveling Remove all attachments, oil stains, external expansion and other defects of the external wall, and repair them to be qualified The height of protrusions is less than 6 mm The gap between masonry and beam and column shall be treated with steel mesh, and the width of steel mesh on both sides of the joint shall be ≥ 200mm The doors and windows are installed and partially filled 3、 Hang the vertical and snap the control line with the expansion bolt under the top wall and the bottom wall, as the vertical hanging point of the wire hanging on the large wall, the high-rise building uses the theodolite to hang the line, the multi-storey building uses the large wire drop to hang the fine wire, and uses the wire tightener to tighten the steel vertical line installed in the big internal and external corners of the wall The distance between the steel vertical line and the wall (source: China insulation net) is the total thickness of the insulation layer After hanging the line, check the flatness of the wall surface with a 2m bar ruler and the verticality of the wall surface with a 2m line supporting board The construction can only be carried out when the flatness requirements are met 4、 During the construction, 1 The blocking work shall be done well before the application of rigid foam polyurethane after the bonding of the blocking polyurethane prefabricated parts at the door and window Doors and windows are generally covered with plastic cloth cut into cloth blocks with the same area as doors and windows Plastic film shall be used for winding protection of irregular parts such as frame pipe and iron 2 Spray polyurethane moisture-proof primer evenly with spray gun or roller brush, without bottom penetration Spray twice with an interval of 2 hours For the weather with high humidity, the time interval shall be extended appropriately, and the first dry surface shall be taken as the standard 3, spray rigid polyurethane foam insulation layer to open polyurethane spraying machine, spray polyurethane foam evenly on the wall surface, multilayer spray method: spray along the top corner of the wall, first top 0.5mm of the bottom layer, then each layer thickness 20mm many times to spray, make polyurethane foam formation multilayer bubble The heat preservation effect of the cold storage is better, and the strength of the polyurethane foam is higher, without cracking and falling off 4 After finishing the polyurethane interface mortar and fully curing the polyurethane insulation layer for 24-48h, the polyurethane interface mortar construction process shall be carried out, and the polyurethane interface mortar shall be evenly sprayed on the surface of the rigid polyurethane insulation layer with the spray bucket or roller brush (source: China insulation network) There shall be no missed spraying or brush during uniform coverage After spraying polyurethane interface mortar for 12-24 hours Home of coatings is specialized in coatings, diatom mud, paint coating, coating technology, fire retardant coating news and coating, diatom mud, paint coating, coating technology, fire retardant coating decoration knowledge and decoration renderings,