The butyl inner tube produced by butyl rubber has low gas permeability, good elasticity and long service life, which is inseparable from the unique molecular structure and performance characteristics of butyl rubber; in addition to excellent air tightness, butyl rubber It also has good heat resistance, ozone resistance and electrical insulation properties. It can be used to manufacture various electrical insulating materials including butyl cable and cable sheath; butyl reclaimed rubber is recycled as waste butyl rubber products. Resources, retaining the basic performance characteristics of butyl rubber, replacing some of the butyl rubber used in cable production to ensure quality and reduce costs.
Butyl rubber is a copolymer of isobutylene and a small amount of isoprene. The internal molecular structure is tight and regular, the degree of unsaturation is low, the molecular chain flexibility is relatively poor, and it has excellent air tightness, water tightness, heat resistance and ozone resistance. Chemical resistance (inorganic strong acid such as sulfuric acid, nitric acid and general organic solvent), low water absorption, good electrical insulation and corona resistance, its dielectric constant is only about 2.1, and its volume resistivity is 10-100 times higher than other rubbers. It can be used to produce rubber cables and can maintain good electrical insulation in the environment of 130 degrees Celsius for a long time. However, due to the poor processing properties and vulcanization properties of butyl rubber, the processing performance of butyl rubber cable is poor, and the vulcanization speed is low. Slower.
As a new raw material to replace butyl rubber, butyl reclaimed rubber has high plasticity, good fluidity, fast vulcanization speed and good vulcanization flatness. The addition of proper amount of butyl reclaimed rubber in butyl rubber cable can reduce production. It also improves the mixing process, vulcanization process and molding process of butyl wire and cable.
In order to ensure the performance and service life of butyl wire and cable with butyl reclaimed rubber, rubber products companies need to properly design butyl rubber / reclaimed rubber cable formula: in general, use butyl rubber and butyl reclaimed rubber to produce rubber When the cable is used, the butyl rubber/recycled rubber cable which has been working for a long time at a temperature of about 80-90 degrees Celsius is vulcanized with a resin, and the heat resistance is better; the ordinary cable is selected from a low-sulfur system, and the proportion of the butyl reclaimed rubber is mixed with Increase the appropriate amount of sulfur; add appropriate stearic acid in the butyl cable formula to avoid the adhesive sticking and sticking out of the die; the filler is mainly calcined clay, with a small amount of talc and calcium carbonate, in order to improve The butyl cable has moisture resistance and electrical properties to improve the processing technology.
There is a certain gap between butyl reclaimed rubber and butyl rubber in performance and index. Rubber cable manufacturers must control the amount of butyl reclaimed rubber in production, and properly mix butyl regeneration without affecting the performance of butyl cable. glue.