Preparation method of ceramifiable silicon rubber composite belt for fire-resistant cable

Abstract

The invention belongs to the technical field of an insulating material for a cable, and discloses a preparation method of a ceramifiable silicon rubber composite belt for a fire-resistant cable. The composite belt comprises a glass cloth reinforcing layer and a silicon rubber layer, wherein the silicon rubber layer is prepared from a ceramifiable silicon rubber composition which comprises organosilicon rubber compound and composite ceramic powder; and the weight ratio of the organosilicon rubber compound to the composite ceramic powder is 1:1-1.2. The preparation method comprises the following steps: preparing high-strength organosilicon rubber compound; preparing composite ceramic powder; performing silicone-acrylate emulsion treatment of glass cloth; and calendering the composite belt. The ceramifiable silicon rubber composite belt for the fire-resistant cable prepared by the method has extremely high strength and good flexibility and can be used for manufacturing the fire-resistant cable in place of a mica tape; after a cable lapped by using the ceramifiable silicon rubber composite belt is ablated for 180 minutes in flame of 650-950 DEG C, the circuit can still work normally; and the method is easy to operate, has high yield and can realize batch production.

Description

technical field [0001] The invention relates to a method for preparing an insulating material for cables, in particular to a method for preparing a wrapping insulating material for fire-resistant cables that can be vitrified under flame conditions to form a hard protective layer. Background technique [0002] In recent years, fire accidents in public places have occurred frequently in my country. According to relevant data, since the beginning of the 21st century, there have been about 909,000 fires in my country, 10,059 people died, and the direct economic loss was about 6.03 billion yuan. The number of fire accidents in public places has exceeded It accounts for more than 50% of the total number of fire accidents in the country. When a fire accident occurs in a public place, the safety and smoothness of the cable is very important for fire prevention and fire fighting. It can not only win the precious rescue time to the maximum extent, but also greatly reduce the casualties...

AI Technical Summary

Problems solved by technology

Although mineral insulated fireproof cables have good fire resistance, their manufacturing process is complicated, the production cost is high, the length of production is limited, and the cables are very hard and cannot be bent, the joints are complicated, the construction is very difficult, and it is difficult to be widely used

Although the mica tape wrapping refractory cable has a simple process and unlimited manufacturing length, there is a common disadvantage of the mica tape. After high temperature combustion, the mechanical strength of the mica tape is greatly reduced and becomes brittle. It is easy to pulverize and fall off after being subjected to severe vibration, causing Poor refractory effect

Moreover, because the mica tape is easy to drop powder when it is rubbed, a large amount of dust at the wrapping site will pose a threat to the health of the workers.

In recent years, researchers have explored and researched ceramic silicone rubber insulated fire-resistant cables, but because the cable manufacturing process requires special mixing, extrusion and vulcanization equipment, the process is complicated, and it is difficult to strike a balance between the strength of the insulating layer and the fire-resistant performance. , the degree of ceramicization is difficult to pass the water and fire resistance test of fire-resistant cables