Coating knowledge: liquid coating PK solid coating which is more suitable for your home

Core tip: paint and people's lives are inseparable It is because of his existence that the colorful world around him comes into being People usually say that the paint is just one kind of coating Today's coatings are divided into solid and liquid Generally speaking, they are divided into solvent coating, water-based coating and powder coating Coating on the surface of objects has other functions such as protection (anti-corrosion, waterproof, oil proof, chemical resistance, light resistance, temperature resistance, etc.), decoration (color, luster, pattern and flatness, etc.) With the development of science and technology, the coating construction process is also changing After the author's sorting and collection, the following is a 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: paint and people's lives are inseparable It is because of his existence that we have a colorful world around us People usually say that the paint is just one kind of coating Today's coatings are divided into solid and liquid Generally speaking, they are divided into solvent coating, water-based coating and powder coating Coating on the surface of objects has other functions such as protection (anti-corrosion, waterproof, oil proof, chemical resistance, light resistance, temperature resistance, etc.), decoration (color, luster, pattern and flatness, etc.) With the development of science and technology, the coating construction process is also changing After the author's sorting and collection, I will introduce you one by one 1、 Liquid coating technology 1 The most widely used coating, but the coating efficiency is low, the production scale has reached a certain degree, and the manufacturers with certain requirements for production efficiency can not tolerate this original coating method Although the accumulated amount of small and medium-sized enterprises is very large, the market is scattered, and the judgment of coating quality is subjective, which is not the most intense field for foundry coating manufacturers Moreover, the core coating quality is not good, the coating surface has brush marks, the coating waste is large, and the coating technology is required to be high 2 Spray coating is the most widely used coating technology in the mechanical and electronic industry, and it is also the most polluted process in all coating processes It is a method for atomizing the liquid coating into a mist, spraying it on the surface of an object, and forming a coating According to the different principles of the tools used, they are divided into two kinds: air spraying and airless spraying Airless spraying, also known as high-pressure airless spraying, uses a high-pressure plunger pump to make the paint form an atomizing air flow at the nozzle and act on the object surface (wall or wood surface) Compared with airless spraying, airless spraying has uniform paint surface and no particle sense Airy spraying, also known as low-pressure airy spraying, relies on low-pressure air to make the paint form atomizing air flow after spraying the muzzle and act on the object surface (wall or wood surface) Compared with the hand brush, the air spraying has no brush mark, and the plane is relatively uniform, and the unit working time is short In addition, it should be noted that if the metal surface is sprayed, it is better to choose metal paint (enamel) In the spraying process, due to the role of compressed air, a large number of "flying paint" will be produced, floating in the construction space; "flying paint" will be adhered to the roof and wall of the workplace, settling to the ground, forming "paint slag" The utilization rate of coating by spraying process is about 50% 3 Dip coating is mainly suitable for small core Dip painting is a kind of painting method that immerses all the paint in the container, takes it out from the tank after a short time, and flows the excess coating liquid back to the tank There is no "flying paint" problem, but solvent volatilization and a small amount of paint dripping on the ground The utilization rate of dip coating is high, which is 70% - 80% The thickness of dip coating is not enough, and the difference of coating thickness between the upper and lower parts of sand core is significant, so it is not suitable for mold Strict requirements for coating concentration Dip coating is widely used in fish automobile industry The automobile industry is the key industry to develop into a pillar industry in China A series of industries represented by it will make the foundry industry develop the dip coating in the future 4 Flow coating flow coating is widely used in sand core, medium and small mold coating Flow coating is to use the pump to extrude the paint from the nozzle at a pressure of 0.02mpa-0.2mpa, and then apply it to the workpiece on the transmitter Excessive paint, overflow drips and returns to the storage tank for recycling The flow coating has no brush mark, smooth surface, high surface quality, coating saving and little environmental pollution It is not only suitable for sand core, but also for mold However, there is the problem of solvent volatilization in the flow coating process, and the utilization ratio of the flow coating process to the coating is as high as 95% 5 Roll coating is used for high speed continuous mechanical coating on one or both sides of sheet or strip It "transfers" the coating onto the surface of the workpiece by the rotating coating roller stained with the coating to form the required thickness of the coating film Roll coating can improve production capacity and output, reduce production cost, rich color, consistent quality of different batches of products, can obtain a variety of surface effects, good flexibility in the processing process, but the film thickness should be strictly controlled 6 Curtain coating curtain coating is mainly used for thin plate or strip coating The paint is pumped or gravity overflowed to form a "paint curtain" through the adjustable gap, which is applied on the surface of the workpiece Curtain coating is a high-speed coating process with the least coating loss 7 Roll coating or rotary drum coating roll coating or rotary drum coating can more effectively control the accuracy and flatness of the plate, and successfully eliminate the concave convex and wrinkle caused by the tradition, so it is commonly used for small parts such as screws, nuts, small screws with single weight less than 0.5kg It is a process that a certain amount of paint is sprinkled on the roller or rotating drum of the workpiece to make the paint evenly stick to the surface of the workpiece 8 Electrophoretic coating mainly refers to "cathodic electrophoretic coating", which is widely used in the automotive industry, and widely used in building materials, light industry, home appliances and other industrial fields, as well as the surface anti-corrosion and decoration of hardware and crafts Cathodic electrophoresis is that the cation resin with positive charge moves towards the cathode after being electrified Due to the increase of pH value near the cathode, particle exchange occurs, and the cathodic coating precipitates and covers the test piece The coating film has strong adhesion, covering power and corrosion resistance (the neutral salt spray test reaches 1000h) Electrophoretic paint is water-based paint Common cathodic electrophoretic paint includes epoxy resin paint, acrylic resin paint and polyurethane paint There was no solvent volatilization in electrophoresis 2、 Solid coating technology solid coating is called "powder coating" It does not use solvent, but covers the fine powder of the coating material on the workpiece, melts it at a temperature higher than the melting point of the powder, and forms a paint film on the workpiece Powder coating includes three processes of "electrostatic spraying", "flow bed" and "electrostatic flow bed" When the powder is collected and reused, the utilization rate of powder coating is almost 100% "Electrostatic spraying" uses electrostatic adsorption to adsorb the powder coating on the workpiece at room temperature, and then heating and melting to form the paint film The "flow bed" is to put the workpiece preheated to the temperature above the melting point of the coating into the floating coating powder, and the coating powder in contact with the workpiece is melted and coated on the workpiece to form the paint film The "electrostatic flow bed" is to set the electrode in the powder chamber so that the negative charge of the coating powder in the flow bed is adsorbed on the grounded workpiece There is no solvent pollution in powder coating, mainly the recycling of coating powder There are enterprises specializing in the production of complete sets of powder spraying equipment, whose products are equipped with a complete powder recovery system, as well as explosion prevention system With the enhancement of people's awareness of environmental protection, environmental protection coatings will be more and more widely used For different coatings, appropriate construction technology should be adopted to ensure the protection and decoration effect of the coating, while reducing the construction cost It is believed that in the future market, people will not only put forward high requirements for the quality of coating materials, but also put forward corresponding environmental protection requirements for the coating construction technology 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 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