Over the past decades, the silicone wire industry has been confronted with challenges to meet the growing needs of the modern extrusion product market.Silicone wire has improved wear resistance, cutting resistance, oil resistance and mechanical strength.As a material with high thermal aging temperature, the value and reliability of silicone wire have promoted its wide use in manufacturers and users.Today, the application of silicone cable in the cable industry is growing, mainly used as insulation and sheath for ship cables, airline cables, motor leads, heating cables and many special purpose cables.
In order to obtain high quality products, the following basic steps must be followed when mixing silicone wires:
(1) Carefully weigh each of the components to be used (e.g. flame retardants, sulfides, color masterbatches, etc.).
(2) After placing the pure or reinforcement rubber of the silicone wire on the smelter, adjust the roll distance so that the silicone wire is wrapped up at a faster speed and fully refining.Pure silicone wires can usually be filled with fillers with little or no refining.However, due to the white carbon black in the reinforced silicone wire, it must be fully refining.The degree of refining is appropriate as long as the rubber package is placed on the roller with a faster speed.
(3) If necessary, add flame retardants, color masterbatches, etc. into the rubber.Some fillers fall into the feeding tray through the drum during the mixing process and should be collected and added to the rubber before the next filling.Rubber scrapers are often used to scrape the filling from the picking tray. It is best not to use a brush, as some bristles may fall off the brush and mix into the rubber.In particular, it is important to note that not all fillers can be added to the compound at one time, but that they should be added in 2-3 times.Every time a filler is added, the rubber must be fully refilled.This ensures that the fillers are evenly dispersed and prevents the formation of hard filling clots.Reasonable roll pitch can guarantee the best mixing speed and quality.
(4) The final addition to the rubber is the vulcanizer.Since the curing agent we are currently using is 2.4-benzoyl dichloride peroxide, do not add the curing agent when the rubber is too hot (up to 40 C), otherwise some of the early curing will occur, leading to loss of the rubber or curing agent.Insert enough cooling water into the drum to prevent the rubber from overheating.Finally, in order to distribute the vulcanizer evenly, the whole roll of rubber has to be thinned several times.
