Common sense of paint: Construction Technology of polyurethane foam spray exterior wall external thermal insulation system

Key tips: 1 Construction process Cleaning of base wall - hanging the vertical line of large wall - leveling with 1:3 cement mortar when the vertical deviation is greater than 1.0cm - pulling the horizontal line (when the wall width is ≥ 2m, the distance between the horizontal lines is 1-1.5m) - applying polyurethane moisture-proof primer - supporting the external corner, internal corner formwork or window formwork from the bottom up, pouring the external corner, internal corner or window & MDAS Paint knowledge how about Akzo Nobel Powder Coating Recommended introduction: powder coating is a kind of coating with different form from general coating, which is in powder form It is a new type of coating, because of its own advantages and more and more known by people Let's introduce Akzo Nobel Powder coating Akzo Nobel Powder coating is a cost-effective coating solution, which can be applied to different kinds of products After the treatment of static electricity and fire baking, a tough and durable coating surface will be formed, with the least impact on the environment Since the introduction of this technology, powder coating has been able to continue to maintain the Paint Home News: 1 Construction process base wall cleaning - hanging the vertical line of large wall - leveling with 1:3 cement mortar when the vertical deviation is more than 1.0cm - pulling the horizontal line (when the wall width is more than or equal to 2m, the distance between the horizontal lines is 1-1.5m) - painting polyurethane moisture-proof Primer - support the external corner, internal corner or window mould from bottom to top, pour the external corner, internal corner or window - window, door, scaffold and other non coated objects for shelter and protection - spray Pu insulation material on the wall 0.8-1.5cm thick - insert the thickness benchmark according to the 45cm spacing and quincunx distribution - spray Pu insulation material to just cover the thickness benchmark - clean, trim the shelter and protect 20 minutes later Protective parts and protruding parts with thickness of 1cm exceeding the specified thickness - polyurethane interface mortar is applied after 1 hour - vertical hanging, square setting and snap control line are suspended - polystyrene particle thermal insulation slurry is applied - grid dividing, color band dividing groove, door and window drip tank are opened Using anti crack mortar, pressing grid cloth - installing steel corner protector on the first wall, installing second times anti crack mortar, pressing second layers of fiberglass mesh cloth, brushing the polymer latex elastic bottom coating - scraping flexible water resistant putty - Construction of external wall coating 2, construction points 2.1, base treatment Before spraying construction, the vertical line of the large wall shall be hoisted first If the vertical deviation of the wall is greater than 1.0cm, 1:3 cement mortar shall be used for leveling After drying for 7 days, Dr polyurethane moisture-proof primer is applied, with a thickness of about 15um When the vertical deviation of the wall is less than 1.0cm, remove the residual ash, slag and other projections on the wall, and directly brush Dr polyurethane moisture-proof primer 2.2 make Pu spraying marking line, hang vertical thickness control line at the external and internal corners, for the wall width ≥ 2m, pull horizontal thickness control line, and the distance between horizontal lines is 1-1.5m 2.3 prefabricate the external corner, internal corner or window from the bottom to the top to support the external corner, internal corner or window mold, and use polyurethane insulation material to pour the external corner, internal corner or window 2.4 before covering and protecting polyurethane thermal insulation materials, use plastic film, waste newspaper, plastic plate or board, plywood, etc to cover and protect windows, doors, scaffolds and other non coated materials 2.5 for the construction of polyurethane insulation layer on the wall, open Pu spraying machine to evenly spray the insulation coating on the wall When the thickness reaches 0.5-1.0cm, set the thickness benchmark according to the 45 cm spacing and quincunx distribution, and then continue to spray polyurethane insulation material The thickness of each spraying should be controlled within 1cm During spraying, sagging shall be avoided as much as possible 2.6 polyurethane insulation layer post-treatment polyurethane insulation layer spraying for 20 minutes, use paper cutter, hand saw and other tools to start cleaning, trimming shelter, protection parts and protruding parts with thickness over 1 cm 2.7 interface treatment polyurethane insulation layer shall be treated with interface mortar within 4 hours after spraying, and the interface mortar can be evenly applied on the polyurethane insulation base with rollers 2.8 hang the vertical, square 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, dot with theodolite, and install the steel vertical line with the tightener 2.9 plastering and leveling of thermal insulation slurry and supplement of thermal insulation during the preparation of thermal insulation slurry and anti crack mortar, the mixing shall be carried out by specially assigned person to ensure the accuracy of mixing time and water addition The mixing quality in the construction site can be judged by observing its operability, anti sliding, paste state and its wet apparent density When plastering, the flatness deviation shall not be greater than ± 4mm, and it is not suitable to plaster too thick, mainly for leveling The plastering thickness shall be slightly higher than the thickness of the ash cake, and then use the bar ruler to scrape flat, and use the trowel to partially repair and level; after plastering the leveling layer for 30min, use the trowel to drive the wall again, and use the supporting line ruler to test and reach the acceptance standard 2.10 the anti crack protective layer can only be constructed after the anti crack layer construction thermal insulation slurry is solidified and dried (it is suitable to press the surface by hand, generally about 3-7 days) and the construction quality of the thermal insulation layer is accepted When plastering the anti crack mortar, the 3-4mm thick anti crack mortar shall be evenly plastered on the surface of the insulation layer, and the cut alkali resistant grid cloth shall be immediately pressed into the anti crack mortar with an iron trowel The overlapping width between adjacent grid cloth shall not be less than 50mm, and the grid cloth shall not be wrinkled, hollowed or warped The first layer shall be paved with double-layer grid cloth, the first layer shall be paved with reinforced grid cloth, and the reinforced grid cloth shall be butt jointed, then the second layer of ordinary grid cloth shall be paved, and the anti crack mortar between the two layers of grid cloth must be full A 2m high special metal corner protector shall be set at the external corner of the first wall, and the corner protector shall be sandwiched between two layers of grid cloth The grid cloth on both sides of the external corners of other floors shall be overlapped with each other, and the lap width of each side shall not be less than 200mm An additional grid cloth of 300 mm × 400 mm shall be added at the four corners of the door and window opening, with the paving direction of 45 ° 2.11 brush polymer latex elastic bottom coating can be coated with polymer latex elastic undercoat after 2h after construction of anti crack layer 2.12 apply flexible water-resistant putty when the surface is concave convex type coating, after the base course is dry, apply flexible water-resistant putty to some key parts for repair, including: the wall surface with insufficient flatness, internal angle, external angle, color band and parts requiring flat coating When the facing is flat coating, the wall is fully coated with flexible water-resistant putty 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,