PVC flame-retardant fire-protection threading pipe

Abstract

The invention provides a PVC flame-retardant fire-protection threading pipe. The pipe is characterized by being prepared from the following components in parts by mass: 80 to 90 parts of polyvinyl chloride resin, 2 to 5 parts of an antioxidant, 11 to 15 parts of a flame retardant, 2 to 5 parts of a reinforcing agent, 0.5 to 2 parts of a lubricant, 2 to 3 parts of a stabilizer, 1 to 2 parts of a processing auxiliary agent and 5 to 10 parts of lightweight calcium carbonate. According to performance selection of a PVC resin material, through addition of additives, high-speed hot mixing and twin-screw extrusion molding, the prepared PVC flame-retardant fire-protection threading pipe provided by the invention has a smoke density grade of above 40, and is applicable to straight conduits for protection of wires and cables with 2000V in industrial and building projects.

Description

technical field [0001] The invention relates to the field of PVC pipes, in particular to a PVC flame-retardant fire-fighting threading pipe. Background technique [0002] At present, many users basically use ordinary flame-retardant PVC threading pipes in their buildings to protect all strong and weak current lines such as network lines, telephone lines, and alarm lines. However, most flame-retardant PVC threading pipes are not flame-retardant or even combustion-supporting. In the event of an electrical line fire, the "flame retardant line" is ignited and releases a large amount of toxic gas and smoke, which will cause a very unfavorable situation for personnel evacuation and rescue, and will cause greater fire safety hazards. [0003] For the existing flame-retardant PVC threading pipes, the Ministry of Public Security’s standard requires higher combustion performance for this type of product, while the Ministry of Construction’s standard requires much lower requirements. E...

AI Technical Summary

Problems solved by technology

[0002] At present, many users basically use ordinary flame-retardant PVC threading pipes in their buildings to protect all strong and weak current lines such as network lines, telephone lines, and alarm lines. However, most flame-retardant PVC threading pipes are not flame-retardant or even combustion-supporting. , once an electrical line fire occurs, the "flame retardant line pipe" will be ignited and release a large amount of toxic gas and smoke, which will cause a very unfavorable situation for personnel evacuation and rescue, and will cause a greater fire safety hazard

[0003] For the existing flame-retardant PVC threading pipes, the Ministry of Public Security's standard requires higher combustion performance for such products, while the requirements of the Ministry of Construction's standard are correspondingly much lower. Except for the oxygen index requirement of 32, it does not reflect fire hazards. Requirements for the smoke density level of important indicators of building materials that affect people's escape under certain conditions

The parallelism of these three standards with different requirements is the main reason for the uneven quality of flame-retardant PVC threading pipe products on the market.

[0004] Therefore, the flame-retardant PVC threading pipes on the market now have different quality on the one hand, and on the other hand, even if the flame-retardant effect is achieved through the selection of additives, there are often disadvantages such as overweight material, general flame-retardant effect, and weakened insulation. result

While this affects performance, it cannot be widely and long-term used in various fields.

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