In terms of building materials, industrial products, daily necessities, floor leather, floor tiles, artificial leather, pipes, wires and cables, packaging films, bottles, foaming materials, sealing materials, and fibers, PVC was the world`s largest production of general-purpose plastics, and its applications are very widely. Widely used in all aspects
PVC is a white powder with an amorphous structure. The degree of branching is relatively small. The relative density is about 1.4. The glass transition temperature is 77~90°C. It begins to decompose at about 170°C. It has poor stability to light and heat. After prolonged exposure to sunlight, it will decompose to produce hydrogen chloride, and further automatically catalyze the decomposition, causing discoloration, and the physical and mechanical properties also rapidly decline. In actual applications, stabilizers must be added to improve the stability of heat and light.
The production process of PVC Resin SG8 and PVC RESIN SG5 is basically the same, and the production equipment is exactly the same. The main difference lies in the formulation of additives, polymerization temperature, reaction pressure and so on. The reaction temperature and reaction pressure of SG-8 resin have basically reached the working pressure limit of the polymerizer. The reaction requirements are relatively strict, and the requirements on operation, safety, technology, and personnel quality are more stringent, and the resin quality is more difficult to control.
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How to use the frozen oil correctly in the screw compressor?
The screw compressor is a high-speed rotating mechanical device. Metal will inevitably generate friction during high-speed rotation. If there is no isolation of the frozen oil at the friction part, the direct contact of the iron will cause them to wear each other. In severe cases, the equipment will be scrapped. run. In addition, the refrigeration oil also plays a role in sealing, cooling, noise reduction, etc. Therefore, the refrigeration oil is an indispensable auxiliary material for the operation of the screw compressor.
For the piston compressors used in the past, the refrigeration oil is a daily consumable, which consumes a few kilograms per day (depending on the size of the model). For the screw machine, since the sealing is better, it is recycled in the machine, and if there is no leakage, the loss is small, and therefore, the replacement cycle is also long. In this way, although the price is very high, the cost of use is not very high compared with the piston.
The refrigeration oil is a common product in the machinery industry. The processing technology is not too complicated, and the raw materials are easy to obtain. Therefore, there are many manufacturers, and the quality problems brought about by it are naturally inevitable. Coupled with the large number of compressors in the market, the source of compressor oil is even more difficult to grasp.
Generally, the compressor equipment should indicate that the compressor oil should use the compressor oil provided by the original manufacturer. If any compressor oil is not used, all the adverse consequences will be at your own risk. During the overhaul process, we found that the main cause of an accident in the main engine was the use of inferior compressor oil. Originally, during the maintenance period, the user replaced the after-sales service object and secretly contacted the after-sales service team outside the manufacturer. After the oil change was less than half a year, the host was scrapped, causing the company to stop production for more than 20 days and the loss was great.
According to experts in the air-conditioning and refrigeration market, the main lubricating oil point of the screw compressor is the rotor. The rotor is generally divided into two types: single-screw and twin-screw. From the perspective of stability and technical content, the single-screw machine is higher; From the requirements of the screw part of the main machine, the requirement of a single screw is higher than that of a double screw. Since the market has little knowledge of this technology, most of them are currently twin-screw products. Whether it is a single screw or a twin screw, the cost of processing a screw is very high. Therefore, the screw compressor belongs to a fine grain product. Why do you say that? The piston compressor generally uses the 19th compressor oil, and the screw machine is generally between the 50th to 80th compressor oils, which is higher than the transformer oil No. 32, and the price is naturally high.
Refrigeration oil is an indispensable auxiliary material for the operation of screw compressors, so the detection of refrigeration oil for screw compressors is also very important. The establishment of a reasonable oil change cycle through the detection of frozen oil can improve the effective use of refrigeration oil and reduce the cost of equipment maintenance.