Teflon is the abbreviation of polytetrafluoroethylene, this material has the characteristics of acid and alkali resistance, resistance to various organic solvents, almost insoluble in all solvents, so it has the title of "non-stick coating". With the development of thermal spraying technology, Teflon coatings can be applied to stainless steel, copper, aluminum, magnesium and various alloy metal materials, but also can be applied to glass, rubber plastic and other non-metallic materials. So, today we are going to introduce, what are the characteristics of Teflon coating? 1.Non-viscous: the coating surface has a very low surface tension, so it shows relatively strong non-viscous, and few solid substances can stick to the coating. 2.Wear resistance: under high load operation, has good wear resistance. 3.corrosion resistance: Teflon is less affected by the chemical environment, can withstand most of the action of organic solvents, can protect parts from chemical corrosion. 4.High temperature resistance: the coating has strong high temperature resistance and fire resistance, high temperature resistance to 300 ° C for a short time, generally between 240 ° C and 260 ° C can be used continuously, with significant thermal stability, but also unexpectedly very low thermal conductivity. 5.Moisture resistance: the coating surface is hydrophobic and oleophobic, and it will not be easy to dip into the solution during production operation. Even if there is a small amount of solution dirt, it can be simply wiped, convenient to clean and save production time. 6.Slippability: polytetrafluoroethylene film has a low friction coefficient. When the load slides, the friction coefficient changes, but the value is only between 0.05 and 0.15. With the continuous improvement of thermal spraying technology, the performance of the coating prepared is also constantly improving, and the excellent performance of Teflon coating is widely used in national defense, aerospace, electronics, electrical, chemical, machinery, instruments, meters, construction, textile, metal surface treatment, pharmaceutical, medical, food, metallurgical smelting and other industries, which has become a spraying technology that cannot be ignored.

In the face of different needs of different industries, rollers also need to do the corresponding coating treatment, so as to improve or compensate the relevant performance of the roller. So what are the surface coating technologies for rollers? 01 Coating treatment The coating treatment of the drum includes zinc plating, chromium plating, nickel plating, etc. The different coating treatment can improve the hardness, corrosion resistance, oxidation resistance and wear resistance of the drum surface. It should be noted that the thickness of these coatings will also affect the performance of the roller. 02 Teflon coating Due to the characteristics of Teflon, the roller coated with Teflon has good high temperature resistance and anti-viscosity. Such rollers are easy to clean and can be widely used in the medical food industry. 03 Spray Painting The roller surface spray paint treatment can make the roller obtain a certain beauty. At the same time, this layer of surface coating can also play a certain role in delaying the oxidation rate of the roller surface. 04 Tungsten carbide treatment By high temperature plasma spraying technology, the roller surface formed a hard tungsten carbide coating. This coating has excellent wear resistance, but also has good high temperature resistance, corrosion resistance, so tungsten carbide roller in all kinds of machinery manufacturing, aerospace, automotive industry and other fields are also widely used. 05 Ceramic coating Ceramic coating has high hardness, wear resistance, chemical stability and other excellent properties, to provide an impenetrable protective layer for the drum, so that it is protected from corrosion and oxidation. Due to the high temperature resistance of the ceramic coating, the ceramic roller can be applied under high temperature conditions. 06 Hard oxidation Hard oxide film usually acts to enhance the surface hardness, wear resistance and other properties of the drum, thereby extending the service life of the drum. At the same time, it also has the effect of changing the surface color of the drum and improving the appearance of the drum. Therefore, the surface coating of the drum has many benefits, and their common goal is to increase the practicality of the drum, thereby improving production efficiency. For the choice of roller surface coating, it is also necessary to consider many factors. If you are confused about the coating choice of the roller, please contact Sinograce Chemical. As a non-stick coating manufacturer,Sinograce Chemical has been focusing on the manufacturing of industrial roll coating for many years, and can provide you with the best roll non-stick coating manufacturing solution.

First: the treatment of the substrate First, the substrate (aluminum, stainless steel or other metal substrate) is baked at high temperature (360℃×30 minutes ~380℃×10 minutes) to carbonize the grease or degreaser cleaning for the first step of degreasing. Step 2: Roughening the surface Available corundum sand 80#~120#, pressure 0.4~0.6mpa, sandblasting, so that the surface roughness of the substrate is :(2.0~3.5)μm Third: the spraying of Teflon primer Teflon primer must be fully rolled or mixed slowly with stirring blades before use (note: Do not use the shear blade to stir at high speed, otherwise it will destroy the structure of the paint and make the Teflon paint deteriorate), fix the treated substrate, and adjust the spray gun pressure to (0.2~0.3)mpa with (1.0~1.5) mm. Distance (20 to 30 cm, concentrate spray directly, use (120 ~ 160 ℃) x (8 ~ 15) minutes, table dry film thickness for 10 ~ 15 microns. Fourth: Teflon coating Teflon paint must also be fully rolled or slowly stirred with stirring blades before use, and the work piece that has been coated with the base oil can be cooled to room temperature (30-50 ° C is generally recommended). With a spray gun nozzle with a diameter of (1.0~1.5)mm, the pressure is adjusted to (0.2~0.3)mpa, the distance is (20~30)cm, the direct liquid spraying, drying at (120-150)℃×(5-8) minutes, sintering at 380℃×10 minutes, the total coating film after sintering is (20~25)μm. The most common problems are: Sintering is not sufficient, either the temperature is not enough, or the time is not enough, the surface of the baked workpiece is white, affecting the adhesion, and the physical property of the Teflon coating will be reduced. Excessive sintering will also make the coating performance deteriorate, so please be careful about construction

The most important difference between non-stick cookware and ordinary cookware is that the surface is coated with a layer of non-stick paint, and the Teflon non-stick cookware commonly used on the market is to coat the main raw material of fluorinated resin such as polytetrafluoroethylene coating on the metal surface such as aluminum, copper or iron, and through sintering. Properties of NI-PTFE coatings PTFE coatings can be applied to metal materials such as carbon steel, stainless steel, aluminum, copper, magnesium and various alloys, and can also be applied to non-metallic materials such as glass, glass fiber and some rubber plastics. The application of flon coatings is usually a combination of its own superior properties, including non-viscosity, low friction coefficient, moisture, extremely high surface resistance, high temperature resistance, chemical resistance, low temperature stability, etc. (1)The surface of the non-stick coating has a very low surface tension, and therefore shows a strong non-stick. Very few solid substances can stick to the coating permanently. Most materials are easy to clean on their surfaces, although the gelatinous material may have some adhesion to its surface. (2)PTFE has the lowest coefficient of friction among all solid materials, ranging from 0.05 to 0.2, depending on the surface pressure, sliding speed and the material of the coating. (3)The non-wetting coating surface is extremely hydrophobic and oleophobic, so cleaning is easier and more thorough. In fact, in many cases the coating appears to be self-cleaning. (4)The extremely high surface resistance can even have a certain conductivity after special formulation or industrial treatment, and can be used as an antistatic coating. (5)The high temperature resistant coating has extremely high temperature resistance and fire resistance, which is due to the high melting point and spontaneous combustion point of PTFE, as well as unexpectedly low thermal conductivity. PTFE coating operating temperature can reach up to 290 ℃, intermittent operating temperature can even reach 315 ℃. (6)Chemical resistance Generally, PTFE is not affected by the chemical environment. The only chemicals known to affect PTFE are molten alkali metals and fluorinated agents at high temperatures. (7)Low temperature stability, many PTFE industrial coatings can withstand the harsh absolute zero without loss of mechanical properties. PTFE industrial coatings can even be used at temperatures as low as minus 270 ° C. NI-PTFE coating is a unique high-performance coating, which is the organic penetration fusion of Teflon particles and nickel base. This coating process achieves the best combination of surface hardness, corrosion resistance and surface friction. The coating thickness can be as thin as 2.5μm, which can uniformly cover more complex workpiece surfaces. After heat treatment, the steel coating can reach HRC62, and the surface dry friction coefficient after coating can be reduced by 95%, f...