Coating technology: medium pressure air mixed spraying technology of waterborne wood paint

Core tip: in the furniture paint market, waterborne wood paint is quietly growing Especially in the field of solid wood door and window coating, some furniture factories have used water-based wood paint for several years, and the proportion is increasing This is closely related to the rapid development of domestic economy, the increase of high-income groups, the enhancement of people's awareness of environmental protection, and the deepening understanding of waterborne wood paint in recent years In some high-grade housing, door frame, window frame, etc are designated to use water-based wood paint for coating Due to the simple use of waterborne wood paint, it is convenient for continuous operation, so in some large door and window factories, medium pressure mixed air spraying is used 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: in the furniture paint market, waterborne wood paint is quietly growing Especially in the field of solid wood door and window coating, some furniture factories have used water-based wood paint for several years, and the proportion is increasing This is closely related to the rapid development of domestic economy, the increase of high-income groups, the enhancement of people's awareness of environmental protection, and the deepening understanding of waterborne wood paint in recent years In some high-grade housing, door frame, window frame, etc are designated to use water-based wood paint for coating Due to the simple use of waterborne wood paint, it is convenient for continuous operation, so in some large doors and windows factories, medium pressure mixed air spraying is used for coating, which greatly accelerates the promotion process of waterborne wood paint in the furniture industry Medium pressure mixed air spraying is a kind of spraying method which combines the advantages of air assisted spraying and high pressure airless spraying It has the characteristics of good atomization effect and high efficiency of high pressure airless spraying At the same time, its coating transfer efficiency (also known as coating utilization) is much higher than air assisted spraying, which can reach 80% (high pressure airless spraying is 60%, air gun is only 40%) The advantages of medium pressure mixed air spraying for waterborne wood paint are as follows: (1) the utilization rate of paint is greatly improved, which is about twice as high as air assisted spraying (2) Production efficiency has been greatly improved Because the water-based wood paint is mostly single component, as long as the viscosity is adjusted properly with water, the paint can be used for a long time and can be operated continuously, which saves the time of continuous feeding and mixing when using cup gun spraying (3) During construction, the viscosity is higher than that of air assisted spraying, which reduces the water addition and speeds up the drying time At the same time, the disadvantages of easy sagging in construction when the viscosity of water-based paint is low are avoided The following factors should be taken into account when air mixed spraying is used for waterborne wood paint: first, the properties of the paint itself, including physical and chemical properties Viscosity, filler composition and solid content, coating time are important reference factors for equipment selection Generally speaking, the lower the viscosity of the coating, the larger the selection range of available equipment Air spraying, high-pressure airless spraying and medium pressure mixed air spraying are all good choices, but air spraying is generally not considered when spraying the coating with high viscosity The filler composition and solid content of the coating are also important reference factors for the selection of spraying equipment For example, there are many fillers in the coating When selecting the air spray gun, the nozzle with larger diameter should be selected, so that the blocking frequency will be lower When selecting the mixed air spraying or high-pressure airless spraying, the filter screen with smaller thickness should be considered to reduce the blocking The frequency of nozzle clogging; if there are some abrasive fillers in the filler of the coating, there should be special requirements for the spray gun, such as the nozzle to be hardened, the needle of engineering plastics, etc Second, coating quality For furniture spraying, different types of furniture have different quality requirements, different process sections have different quality requirements According to the routine, the better atomization effect of spray gun, the better spraying effect For furniture paint, because of its low viscosity, the atomization effect of air spraying is very good If the factors of efficiency and cost are not considered, air spraying can meet the needs of each process section For the common equipment of furniture painting, air spraying is better than mixed air spraying in terms of atomization effect Air spraying can be used in all process sections of furniture spraying (including color repair), while mixed air spraying can be used in the bottom and top coat spraying of furniture Third, construction efficiency Due to the different atomization methods, the construction efficiency of various spraying equipment is very different In furniture painting, under the premise of meeting the spraying quality, the production efficiency of air spraying can reach 600ml / min, and the mixed air spraying can reach 1000ml / min fourthly, the painting cost In furniture production, most manufacturers use manual spraying, so the painting cost is quite different For the same product, the painting cost of different manufacturers may vary as much as 30% The main factors are: the operation level of workers, the type of painting equipment, the cost of paint, etc Among them, the cost of paint can be considered as fixed, and the biggest impact on the cost of painting is the operation level of employees and the type of painting equipment A high level of operation can ensure a high primary yield, reduce rework, and save production costs, while proper selection of painting equipment can effectively ensure production quality and improve paint utilization For the common types of painting equipment for furniture painting, the paint utilization ratio is arranged from high to low as follows: electrostatic mixed air spraying (98%), electrostatic air spraying (80%), medium pressure mixed air spraying (80%), air spraying (40%) It is not difficult to see that the consumption cost of coating will be quite different if different equipment is used to spray the same product Therefore, for different spraying process sections, under the premise of ensuring the coating quality and production efficiency, selecting a painting equipment with high paint utilization rate is also the key factor of coating cost control Fifth, the operability of the equipment Because the furniture industry usually uses manual spraying operation, the operability of the equipment is also a factor that must be paid attention to Generally speaking, a good set of painting equipment should be easy to operate, easy to learn, easy to maintain and convenient to reduce the labor intensity of workers For various furniture painting equipment, due to its own design reasons, the operation requirements are different: air spraying is relatively flexible and convenient due to the softness of the pipe; high pressure airless spray gun is relatively hard due to the pressure resistance of the paint pipe, and the spray fan is determined by the nozzle model, which is not adjustable, so it is suitable for some mass production occasions; electrostatic spraying is required due to Some safety protection facilities are required, which have additional operation requirements for operators Based on such factors, for different painting equipment, professional operation training should be conducted according to its own performance characteristics to ensure that the equipment can play its role to the maximum extent 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,