The development direction of coating technology With the development of industrial technology and the increasing demand for coating products in the society, coating technology has been greatly developed in the past decade. The research direction of modern coating technology is moving towards two extremes. Coatings for battery pole pieces and non-woven coatings are required to be very thick; coatings such as optical films and thin layers of magnetic recording media require very thin coatings, even A few nanometers. Nano-coating requires thinner coating thickness and better coating uniformity. Therefore, it is very important to select the appropriate coating method, enhance the quality of the coating layer and adjust the rheology of the coating liquid. The necessary conditions for technology. Since the bar and air knife coating are only suitable for coating of thinner coatings (related instruments: applicators), the application of lithium ion battery pole pieces requires a wet coating of 100 to 300 μm for such high For precision coating of thick coatings, extrusion coating or roll coating is generally used, but for the ultra-thin layer, high-output magnetic recording medium, the pole piece coating can be applied by two-layer film stretch extrusion coating. At the same time, with the increasing demand for modern high-speed coating, higher requirements are placed on the performance of the coating. The rheological properties of coatings are a key factor in determining coating quality. Therefore, the rheological properties of coatings have become a hot research topic at home and abroad. When the concentration of the coating liquid is high, the coating after coating is thick; and the coating liquid of low viscosity can be coated with a thin coating. In addition, during the blade coating process, the coating liquid is subjected to a higher shear rate, and the coating liquid is required to meet the requirements of “high concentration and low viscosityâ€, the concentration requirement is 60% or more, and the performance of shear thinning is also obtained. To have a lower viscosity [28 centrifuge] at higher shear rates. This is because when using the same glue electronic balance adhesive, the concentration of the coating liquid is larger, the solid content is larger, and the electronic balance overcomes the attraction between the particles to increase the friction [2 disperser 9], but the air knife coating is affected. For the limitation of airflow energy, a low solids, low viscosity coating liquid is generally used [30]. In the coating process, the rheology of the coating can be modified by optimizing the process formulation to achieve the purpose of good coating operation, and the nano-scale particles can be used to change the rheological properties of the coating preparation liquid. Due to the surface effect and quantum size effect of nano-sized particles, it can be used to control the potential, pH and apparent viscosity of the coating liquid to achieve high-concentration and low-viscosity of the preparation of coatings. The addition of new nano-auxiliaries promotes high-speed coating. The operability of the cloth coating operation [31]. In addition, during the coating process, there are many factors affecting the coating quality of the vibrometer, mainly from the mechanical equipment "target=_blank> mechanical equipment, process, materials, etc., so, enhance the apparent quality of coating. On-line detection is very important. For example, the online measuring device feeds back the measured data of the coating loading amount to the program control device, and the program control device calculates the real-time loading amount of the coating and the preset of the coating. The amount of loading is compared and then an adjustment command is issued to the coating apparatus to adjust the amount of coated slurry output.
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