Manufacturing process of chlorinated polyethylene sheath for wires and cables:

1. Mixing
Compared to traditional forms of chloroprene rubber. Chlorinated polyethylene does not require plasticization and does not require storage after plasticization. The liquid form additives in the chlorinated polyethylene formula can be stirred and absorbed through other powders during the batching process, which can avoid cleaning and dripping during the actual mixing process. The vulcanization temperature of chlorinated polyethylene is required to exceed 160 ℃ Continuous production can be carried out with cooling water, but the temperature generally does not exceed 160 ℃. So the vulcanizing agent used in chlorinated polyethylene does not need to be added separately from other additives, and can be directly mixed with other powders. The mixing temperature requirements for chlorinated polyethylene are relatively broad, ranging from 40 ℃ to 120 ℃, and there will be no sticking or burning of the rollers. When using an open mixer, it is necessary to turn off the cooling water or turn on the steam in a timely manner. Because chlorinated polyethylene generates a large amount of heat energy due to friction during mixing, it is necessary to add sufficient cooling water when mixing in the internal mixer. The dispensing temperature is generally between 110 ℃ and 120 ℃ This allows for a large amount of continuous mixing work without adversely affecting the quality of chlorinated polyethylene.
2. Parking and hot refining
Compared to chloroprene rubber, chlorinated polyethylene mixed rubber has better storage stability and does not require low-temperature storage. High temperatures in summer do not have a direct impact on it. Chlorinated polyethylene does not require cooling during hot refining, and the refining temperature is generally above 50 ℃.
3. Making protective sheaths for wires and cables
Chlorinated polyethylene can generally be used in the production of wire and cable sheaths using long screw extruders or short screw extruders. Generally speaking, the wire and cable sheaths made by long screw extruders will be brighter, smoother, and have more detailed cross-sections. When extruding chlorinated polyethylene adhesive, the head temperature is generally between 6 ° C and 90 ° C. Due to severe frictional heat generation during the refining process of chlorinated polyethylene, the temperature inside the rubber material will be higher, generally between 90 ℃ and 120 ℃. Therefore, when using a long screw extruder, it is necessary to monitor and control the basic temperature well to avoid burning of the rubber material.
4. Sulfurization process
Compared with other commonly used types of rubber materials, the temperature requirement for the vulcanization process of chlorinated polyethylene is relatively high, usually between 160 ℃ and 180 ℃ The vulcanization requirements for chlorinated polyethylene wire and cable sheath rubber are:; When the saturated steam pressure is 054 MPa, the vulcanization temperature is 160 ℃ and the vulcanization time is generally between 25min and 30min. When the saturated steam pressure is 098MFRa, the vulcanization temperature is 180 ℃ and the vulcanization time is generally between 6mir-10 min. When the saturated steam pressure is 152MPa, the vulcanization temperature is 200 ℃ and the vulcanization time is generally between 1mir-3 min. As the saturated steam pressure gradually increases, the vulcanization temperature also gradually increases, while the vulcanization time decreases. The resulting chlorinated polyethylene rubber has better tear resistance.