Flexible fireproof pipe for wires and cables and application thereof

Abstract

The invention provides a flexible fireproof pipe for wires and cables. The flexible fireproof pipe is integrally in a hollow pipe shape and comprises a flexible resin outer layer and an expandable graphite inner pipe, wherein the flexible resin outer layer is coated on the outer layer of the expandable graphite inner pipe; and the expandable graphite inner pipe is prepared from the following raw materials: flexible resin, expandable graphite, white carbon black, a flame retardant and a carbon-forming agent. The modified expandable graphite is adopted in the expandable graphite inner pipe, a certain expansion ratio is achieved at the low temperature, and the fireproof effect can be achieved at the initial stage of fire disasters and when the temperature is not high. The fireproof pipe for wires and cables has good weatherability, and shows excellent weatherability in tests of frost cycle resistance, high temperature and high humidity resistance, corrosion resistance, water resistance and oil resistance, so that the fireproof pipe provided by the invention is durable.

Description

technical field [0001] The invention belongs to the field of fire prevention, and in particular relates to a flexible fireproof pipe for electric wires and cables and its application. Background technique [0002] At present, in buildings, due to the increase of electrical equipment, it is necessary to open many penetrating holes between walls and floors to facilitate the passage of wires and cables. When a fire breaks out, these holes become a safety hazard. Heat and salt mist spread to other rooms through the holes. More importantly, the cable channel may form a shaft effect and aggravate the fire. [0003] At present, fireproof sealing materials are generally used to seal the holes, but the currently available split materials generally have insufficient flexibility, are not easy to disassemble, and have poor weather resistance, especially poor water resistance. These are often the defects that restrict the cable protective sheath. Use fireproof mud, after solidification,...

AI Technical Summary

Problems solved by technology

However, the problem of poor water resistance has not been solved

[0007] The above-mentioned fireproof sealing material also has the problem that the fireproof material may melt and drop at high temperature, and cannot maintain a complete shape, which will be unfavorable to fireproof and flame retardant.

On the other hand, the fireproof and anti-virus materials using expandable graphite in the prior art utilize the expansion of expandable graphite at high temperature, which plays the role of isolating poisonous smoke, hot gas and heat insulation, but the expansion at low temperature at the initial stage of the fire is still It is unsatisfactory. It is well known that after a fire, the time for gold to extinguish and rescue the fire is in the early stage of the fire. There is a need for a fireproof material that can have a certain expansion rate at low temperature (200-600°C)

[0008] Therefore, based on the above reasons, the current fireproof materials for wires and cables in the construction field do not have expansibility when a fire occurs, which may easily lead to the spread of smoke, or, as the fire progresses, the fireproof materials are easy to scatter and lose fireproofness.

In addition, the weather resistance is not good, especially the water resistance can not meet the needs; there is no expansion at low temperature or the expansion rate is very low, and the defects of melting dripping and melting will occur at high temperature. It is urgent to provide a good weather resistance and stable performance. Fireproof tube for wire and cable that can expand at low temperature and has an excellent fire rating

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