Plasticizing process
Plasticizing is a process in which a polymer is mixed with a solid object and softened by heat into a viscous fluid state. This process allows the polymer to have better processing properties, so it is widely used in the manufacture of various plastic products.
Among them, the practical equipment for PVC plasticizing is a double-roll plasticizing machine. It cuts the material through rollers of different speeds, so as to achieve the effect of plasticizing. At the same time, the length of plasticizing time is also an important factor affecting the plasticizing effect. Select different plasticizing time according to different materials to ensure the best results.
Plasticizing can not only improve the processing properties of polymers, but also optimize their mechanical and physical properties. Therefore, plasticizing technology has become one of the important processes for the manufacture of various plastic products.
With the continuous development of science and technology, plasticizing technology is also constantly innovating. For example, on the basis of the traditional two-roll plasticizer, new plasticizers have emerged, such as single-screw plasticizer and twin-screw plasticizer. These new technologies can not only improve the efficiency of plasticizing, but also shorten the plasticizing time and reduce production costs.
Preparation of plasticizing process
Preparation for feeding
The polymer is sieved and magnetized before being added to the cylinder. The purpose of sieving is to remove some impurities, ensure the purity of the material and try to be uniform in the particle size of the material. Magnetic absorption treatment is to prevent the mixing of metallic substances. Other additives also need to undergo some treatment before use, such as preheating the plasticizer before mixing, and using some additives that are harmless to the human body and the environment. The feeding amount of a time should be controlled properly, and the feeding amount is different for different two-roll plastic refining machines.
Control of plasticizing temperature
Plasticizing temperature is mainly set according to the decomposition temperature of the material, the material is added from the roller, the higher the temperature of the roller, the material will melt, that is, the contact area of the material and the roller is large, the greater the adhesion, the material is easy to mix evenly, but the temperature of the roller cannot be too high, if the temperature is too high, the material may decompose. The temperature is too low, the contact is small, the adhesion is small, and the mixing is uneven, which is not conducive to plasticization.
Control of plasticizing time
The effect of plasticizing is proportional to the plasticizing time, the longer the plasticizing time, that is, the more evenly the material is mixed, the better the plasticizing effect, but the longer the time is too long, it will lead to low production efficiency, short plasticizing time, and the uneven mixing of materials, the effect is not ideal. Select different plasticizing time according to different materials, and the appropriate plasticizing time is the guarantee of plasticizing effect.
Initial mixing of materials
The initial mixing is not a violent mixing, it is a mixing below the melting point temperature of the polymer and under a small shear force. The purpose of the initial mixing is to perform a mixing before mixing in the later mixer to improve the mixing uniformity of the final product. The mixing process is to increase the degree of random arrangement of the components, which is a simple mixing.
Plasticizing of the initial mix
The initial mixture is plasticized, and the purpose of plasticizing is to increase its plasticity, so that the components are evenly mixed. Different plastics have their own suitable plasticizing conditions, the main control conditions are: plasticizing temperature, plasticizing time and shear stress. The end point of plasticizing can be determined by the degree of mixing uniformity and dispersion of the material, and can also be determined by measuring the tear strength of the plastic sample.
In short, plasticizing technology is an integral part of modern industrial development. It can improve the quality and production efficiency of plastic products, but also promote the development of environmental protection industry. We should actively explore and innovate plasticizing technology to contribute to sustainable development in the future.
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