The main equipment used in the production process of coatings is grinding and The performance of liquid and coating film plays a very important role. Therefore, just like carefully designing color paint formulations, choosing professional and effective dispersing and grinding equipment is an important link that cannot be ignored to ensure the production of high-quality paint products.
Equipment selection and production process are related to varieties. Some pigments are easily destroyed (such as mica, pearlescent pigments, aluminum powder , cuprous oxide), while some must be ground under very strong shear force to achieve proper performance (such as organic toner ). There are many kinds of coatings, and the requirements for production equipment are also very different.
1. Kneader
In the production of paint putty, such as various construction putty, relief paint, stone paint and other products with high solid content, high viscosity, high thixotropy, and low fineness requirements, the kneader is a good choice. choose. There are many types of kneading machines, such as conical , horizontal, V-shaped, rotary, etc., with mature technology and a wide range of uses.
2. Ball mill/three-roll mill
Ball mills include horizontal ball mills and vertical ball mills, which are intermittently operated ball mills .
Three-roll mills are suitable for processing high-viscosity slurries and difficult-to-disperse pigments. However, the open operation makes the working environment harsh, the operation safety is poor, the loss of dispersed materials is large, the structure is complicated, the debugging is difficult, and the production efficiency is low. It is basically no longer used in the modern coating industry.
3. Sand mill
The sand mill is one of the most widely used grinding equipment in the paint industry at present. It can be produced continuously. The quality of the processed products is good simple, and the operation is easy. It is suitable for the production of topcoats and most color pastes with high fineness requirements. . However, it is not very suitable for special pigments , such as temperature-sensitive pigments, pearlescent pigments, and flake pigments. Moreover, it is difficult to process when the viscosity of the slurry is high, and it is difficult to clean when changing colors, and there are many residues. There are many designs and varieties of sand mills. When selecting, the appropriate model and grinding medium should be determined according to the viscosity of the material, the nature of the pigment , and the demand for output.
4. Basket sand mill
Basket sand mill is a relatively new product developed, a new type of sand mill that integrates grinding and dispersing. Using circulating grinding technology, its principle is similar to high-circulation and large-flow horizontal grinding machine, suitable for grinding coatings and products with high solid content, high viscosity, and difficult to grind; with forced cooling device, it is suitable for temperature-sensitive pigments. Effective dispersing and grinding has the advantages of stable start, high continuous production efficiency, convenient color change, easy cleaning, and simple operation.
5. High-speed dispersing machine
The high-speed disperser is a commonly used paint production equipment, and it is also a kind of grinding and dispersing equipment for paint with a simple structure. Its working principle is: after the rotation of the motor undergoes stepless speed change, it drives the main shaft to rotate at a certain speed. The impeller, the high-speed rotation of the impeller produces mixing and dispersing effects on the materials, suitable for grinding and dispersing ultra-fine pigments, simple mixed dispersion and paint mixing can be used, convenient cleaning, high production efficiency , large production capacity and low pollution. With the emergence of new high-speed dispersing equipment (such as double-shaft double-impeller high-speed dispersing machine, three-shaft high-speed dispersing machine, different types of dispersing discs, different rotation methods, etc.), its application scope is expanding day by day. However, it is mainly used for pre-dispersion for the production of coatings and organic color pastes with high fineness requirements . High-speed dispersing machine can refer to Figure 4-1-57.
6. Coating equipment
The complete set of coating equipment is an integrated complete set of grinding and coating automation equipment provided by the equipment manufacturer for customers. The equipment can independently complete the whole process of vacuum feeding, dispersion, grinding and refinement, cooling, paint mixing, filtration, automatic filling, etc., generally for Automatic control of vacuum feeding, electronic metering, on-line detection, automatic control of the production process PLC man-machine interface, and recipes are automatically stored by the CPU. Manufacturers can design complete sets of equipment with different functions according to customers' product varieties and output requirements.
Online mixing and dispersing equipment is a new design in the field of coating equipment, based on the principle of mixing and dispersing dry pigment particles to ensure that the pigment particles are fully crushed before contacting the liquid under vacuum. The vacuum can fully , and solve the problem of dust and solvent volatilization. At the same time, this new technology can greatly reduce the production time, reduce the space occupation, easy to clean, the output can be large or small, and can be continuous Production can also be interrupted. The equipment makes wetting more complete and dispersion more effective, which can save 90% energy, reduce temperature rise, reduce operation risk, and is widely and easy to clean.
