Why to add different parts of chlorinated polyethylene into the buried pipe of power cable

Some ingredients, seasonings, etc. we use in our life. When these articles are used in some fields, they should be well mixed. A certain number of them should be available, and they can't be put in as many as they like. This will only lead to the failure of deployment. In fact, chlorinated polyvinyl chloride will also be added here when the power cable is buried, and it needs different parts. Why is that?

This is because there are certain standards for the physical and chemical indexes of chlorinated polyvinyl chloride, of which 67.0 ± 0.1% chlorine content is essential for processing. The moisture content of CPVC (i.e. volatile matter) in Japan is less than or equal to 0.1%. In China, the moisture content can only be determined as 0.2%, which can not be kept unchanged for one year, but only for three months. Therefore, using pure CPVC as a sample to test its Vicat heat resistance index, the CPVC produced in Japan can reach 131 ℃, while the domestic CPVC can only reach 126 ℃. Adding additives and other polymers in the formula, except plasticizers, will reduce the temperature of Vicat. In addition, equipment, mold, process temperature and pressure, as well as the stay time in the screw, cooling traction, expanding and other ways will have an impact. From the end of February to the beginning of March 2001, Vicat the Research Institute of Zhongyuan Chemical Co., Ltd. in Japan, the field test and product sampling test show that Vicat ≤ 116 ℃, Therefore, there is a little room for the international and domestic standard PVC-C hot water pipe to be ≥ 11o ℃. That is to say, 100 parts of CPVC and all kinds of additives are used to cooperate, and only when the process conditions, equipment, molds, etc. are supported, can we pass the customs if we operate carefully; as for the pipe fittings ≥ 103 ℃, we can add 10 parts of PVC or add 0.1-0.2 of lubrication and stabilizer properly.

Therefore, the use of some products is not as simple as it seems. They should be operated according to relevant standards and adjusted according to their own actual situation, so that the product can play its good performance. Chlorinated polyvinyl chloride has good corrosion resistance, heat resistance, solubility, fire resistance, etc. when it is used in some fields, adjust the fraction to improve the effect and improve the use effect.