Common knowledge of coating: Problems and prevention methods in the construction of synthetic resin curtain wall

Core tip: some problems are easy to appear in the construction of synthetic resin curtain wall? So how to solve it? In this paper, some quality defects (also called film morbid) in the construction of fluorine resin coating for imitating aluminum plate are introduced (1) Film blistering ① The reason for foaming is that the permeability of fluororesin coating is poor If there is water left in the base layer, it is difficult to escape When the temperature rises or there is too much water, bubbles will be generated It is required that the moisture content of the base course of the fluororesin coating for aluminum like panel is less than 8%, and the moisture content is the root of foaming, so it is not allowed to be used Shenyang steel structure fireproof coating construction expert punde Building Fire Engineering Co., Ltd Recommended introduction: since its establishment, Shenyang punde Construction Fire Engineering Co., Ltd has cultivated a group of professional construction teams with excellent equipment, rich experience and serious responsibility with advanced and scientific management methods and strict engineering quality assurance and after-sales service system It has undertaken a number of fire system installation projects, which has been praised by customers Every idea and special requirement of you will be fully considered by us and fully realized in the construction technology, which will become the cornerstone of our successful long-term development We are looking forward to your invitation, to provide you with quality services and high-quality technical support! All construction coatings have passed ISO9001 Paint Home News: synthetic resin curtain wall construction prone to some problems? So how to solve it? In this paper, some quality defects (also called film morbid) in the construction of fluorine resin coating for imitating aluminum plate are introduced (1) Film foaming ① the reason for the foaming is that the permeability of the fluororesin film is poor If there is water left in the base layer, it is difficult to escape When the temperature rises or there is too much water, bubbles will occur It is required that the moisture content of the base course is less than 8%, which is the root of blistering The key to solve the blistering problem is to eliminate the moisture content or ensure the drying of the base course a It is an important reason for foaming that the base plastering base is constructed before it is completely dry b In the production process of putty layer, a large amount of water retaining agent is added When applying putty, the putty film is not completely dry and the residual moisture is too much due to too thick partial application or too rush time c When the primer is not completely dry, it will encounter water and blister when it is heated in the sun; D the film is in contact with water or exposed to high humidity atmosphere; e when adjusting the viscosity of the paint, the diluent is not used properly, and bubbles are caused due to too fast evaporation speed ② Prevention and control measures to ensure that the moisture content of the base meets the requirements; do a good job in the waterproof of the base Treatment of layer; putty used for decoration shall have corresponding strength and anti cracking, so as to prevent the damage of waterproof layer and blistering caused by water seepage and water leakage, and meanwhile, putty shall also have certain waterproof function; guide the water to escape, for micro amount of water, gas conditioner can be added to make the coating film have one-way ventilation function similar to the skin to prevent the generation of bubbles; sealing primer shall be selected for sealing Micro moisture; the setting of the grid joint makes the micro moisture increase the way to seep out and prevent the bubbles caused by the moisture escaping; the window edge, cornice and other water prone parts are sealed to prevent the moisture from entering (2) The flatness, the treatment flatness of grid joint and internal and external corners, the horizontal, vertical and even depth of grid joint are important indexes of the fluororesin coating for aluminum imitation panel The flatness standard of the fluororesin coating for aluminum imitation panel is 1mm, which is much higher than the requirement of 2mm for advanced plastering ① Flatness A cooperate with the general contractor to check and accept the base course and make sure that the plastering surface meets the requirements of advanced plastering; B divide the wall surface according to the building characteristics and Party A's requirements; C measure it up and down with a 2mm special guiding rule, left and right, and attach the testing tools, with the required flatness of 1mm; D operate on the dividing surface with guiding rule, and finally close the stubble to the dividing joint; e In order to ensure the flatness, the amount of special putty must reach 3-4kg / m2 ② The setting and treatment of the dividing seam a the setting of the dividing seam not only plays an aesthetic role, but also plays a buffering role in the small cracks to avoid the generation of cracks; B the depth and straightness of the dividing seam have a direct impact on the beauty, and special technicians for cutting and mending the seams shall be equipped, and special tools shall be equipped to ensure the beauty, vertical and horizontal straightness of the dividing seam, and even depth ③ Treatment of internal and external corners A internal and external corners shall not have tails, and shall be flat and well maintained; B baffle, protective paper or protective film shall be used for construction protection of internal and external corners (3) Causes of falling off ① A improper treatment of base course, dirt, rust, moisture, dust and chemicals on the surface; B top coat or varnish shall be covered before the primer dries completely, and the paint film is easy to fall off or crack; C the coating is too thick, the bottom layer is not completely dry, and the top coat shrinks too much during the drying process, resulting in cracking, falling off, etc.; D wet or moldy bricks and cement Coating on the base course, the adhesion between the coating and the base course is not good ② Prevention and control measures A before construction, the base course shall be thoroughly cleaned; B generally, the base course shall be completely dried before coating or varnishing; C each coating shall not be too thick during construction; D the brick base course and cement base course shall be dried and thoroughly treated before coating (4) The causes of film cracking are as follows: A coating two coats of paint before the first coat is dry; B coating is too thick and not dry; C coating is layered or precipitated and not stirred evenly before use; D too much diluent is added in surface coating, which affects the adhesion of film ② Prevention and solution A two coats of paint shall be applied after the first coat is completely dry; B each coat of paint shall not be too thick during the construction process; C the paint shall be fully stirred and uniformly applied; D the quality of surface coating shall meet the requirements of standards (5) The causes of the coarseness of the coating ① are: A impurities are mixed in the coating during storage and use, and there is no filtration before use; B moisture is mixed in the coating, and the pigment particles become coarser; C too much diluent is added when adjusting the viscosity of the coating; D the diameter of the spray gun is small, the spraying pressure is too large, and the distance between the spray nozzle and the spraying surface is too large ② Prevention and solution: a the coating should be filtered before use; B the coating should be sealed after use to prevent the mixing of moisture; C the coating should be diluted correctly according to the requirements; D the correct pressure should be adjusted, the appropriate nozzle should be selected and the spraying should be carried out correctly (6) The causes of wrinkles are: a the viscosity of the coating is too high, or the coating is too thick; B the coating is directly exposed to sunlight after construction ② Prevention and solution: a the viscosity of the coating shall be adjusted properly before construction, and the coating film shall not be too thick for one time; B the working surface shall not be exposed to direct sunlight during coating construction (7) Pinhole ①: a the viscosity of the coating is too high, the air temperature is low during construction or the coating is left standing for a short time after mixing, and there are still residual bubbles; B the amount of solvent with low boiling point is large, and the coating surface is not completely dry after drying; C the diameter of the spray gun is small, the spraying pressure is too large, and the distance between the spray gun nozzle and the spraying surface is too large; d There is moisture in the coating, and there is dust in the air; e Apply paint on sweaty and oily surfaces ② Prevention and solution a the construction shall be carried out when the environmental conditions meet the requirements of the construction conditions, and the viscosity of the coating shall be adjusted properly, and the coating shall be allowed to stand for a period of time after mixing; B pay attention to the combination of solvents and the diluent with appropriate performance; C adjust the diameter of the spray gun, and master the spraying technology; D avoid carrying water into the coating and purifying the air during the construction; e The base course shall be cleaned before construction (8) The causes of orange peel ① are: A small diameter of spray gun, too large spraying pressure, too large distance between spray gun nozzle and spraying surface; B low or too high air temperature during construction; C large amount of low boiling point solvent, too fast evaporation; D moisture in coating ② Prevention and solution: A spraying technology shall be well mastered; B construction shall be carried out when the environmental conditions meet the requirements of construction conditions; C pay attention to the combination of solvents and the diluent with proper performance, which can appropriately increase the solvent with high boiling point; D avoid bringing water into the coating during construction (9) Causes of shrinkage ①: A too much silicone oil defoamer is added in the coating; B too many solvents with low boiling point and high boiling point are included in the solvent or diluent, and the proportion is not appropriate; C oil and water are brought in during spraying; the diameter of the spray gun is small, and the spraying pressure is too large; the distance between the spray nozzle and the spraying surface is too large; D the viscosity of the coating is too high or too low ② Prevention and solution: A control the amount of silicone oil defoamer in the coating; B pay attention to the use of low boiling point and high boiling point solvents and the adjustment of solvents; C avoid bringing water and oil into the coating during construction, master the spraying technology; D adjust the viscosity of the coating properly before construction (10) The causes of sagging are: a the viscosity of the coating is too low and the coating is thick; B the temperature of construction is high and the drying rate of the coating itself is slow, so the fluidity in the film-forming process is large; C the surface of the base course is uneven and the surface treatment is not good, containing oil and water; D the edges and corners of the base course and the grooves of the base course accumulate too much coating; e The spraying pressure is controlled unevenly, and the distance between spray nozzle and spraying surface is controlled unevenly; F the evaporation rate of diluent used in diluting coating is slow or fast ② Prevention and solution: A adjust the viscosity of the coating, increase the number of construction passes, and each coating should not be too thick; B the construction temperature should not be too high, generally below 35 ℃, and should not be constructed when the temperature is too high; keep the proper ventilation of the construction site; C thoroughly treat the base course; D pay attention to the corners and grooves of the base course not to accumulate coating during construction; e Master spraying technology; F use diluent with moderate evaporation rate (11) The causes of floating color: a the cross part of decoration color is not properly protected; B the color difference caused by the unevenness of the construction hole and the wall; C the spraying of the construction hole and the feeding hole is not synchronized with the large surface construction ② Prevention and solution: A correctly protect the cross part of mounting color to prevent the pollution of atomized coating during spraying; B make up the hole in advance, and the hole filling place shall be lower than the large surface; C keep the spraying of construction hole, feed inlet, etc in synchronization with the large surface The above are the problems and prevention methods that are easy to appear in the construction of the synthetic resin curtain wall, which are arranged in small-scale I hope it will be useful to you 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,