Anti-bending halogen-free flame-retardant sheath material for elevator flat cable as well as preparation method and application of bending-resistant halogen-free flame-retardant sheath material

Abstract

The invention discloses an anti-bending halogen-free flame-retardant sheath material for an elevator flat cable as well as a preparation method and application of the anti-bending halogen-free flame-retardant sheath material. The anti-bending halogen-free flame-retardant sheath material comprises the following raw materials: ethylene-propylene-diene monomer, a compatilizer, a flame retardant, a lubricant and an antioxidant, the ethylene content of the ethylene-propylene-diene monomer is 65-75%, the oil charge ratio is greater than or equal to 40 phr, and the Mooney viscosity is 40-75. The sheath material further comprises linear low density polyethylene, an initiator and a silane coupling agent. The sheath material is prepared by partially or completely grafting the linear low density polyethylene and the ethylene propylene diene monomer with the silane coupling agent under the action of the initiator before extrusion, and then conducting blending and extruding with other raw materials, or is prepared by subjecting all the materials in the raw materials to mixing, banburying and reaction and then conducting extruding. A sheath for the elevator flat cable prepared from the sheath material is simple in material formula, easy to process and low in cost, and particularly has excellent wear resistance, halogen-free flame retardance, high and low temperature resistance, excellent flexibility, excellent mechanical property and the like.

Description

technical field [0001] The invention relates to the technical field of elevator flat cables, in particular to a bending-resistant, halogen-free, flame-retardant sheathing material for elevator flat cables, a preparation method and application thereof. Background technique [0002] At present, with the improvement of living standards and the advancement of social technology, elevators are basically equipped in new buildings, and the flat cables used in elevators are generally required to have good wear resistance, halogen-free flame retardancy, and high and low temperature resistance. And excellent flexibility, mechanical properties, etc.; for manufacturers, it is required that the materials for elevator flat cables have good processing technology, especially the extrusion speed should be fast, easy to process and easy to process, and the cost of raw materials should be as low as possible. The stability between batches is good, and it must also comply with various national an...

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Problems solved by technology

[0002] At present, with the improvement of living standards and the advancement of social technology, elevators are basically equipped in new buildings, and the flat cables used in elevators are generally required to have good wear resistance, halogen-free flame retardancy, and high and low temperature resistance. And excellent flexibility, mechanical properties, etc.; for manufacturers, it is required that the materials for elevator flat cables have good processing technology, especially the extrusion speed should be fast, easy to process and easy to process, and the cost of raw materials should be as low as possible. The stability between batches is good, and it must also comply with various national and industry regulations. For example, currently there are generally high requirements for environmental protection and safety, and the materials used for elevator flat cables must be low-halogen or even halogen-free and flame-retardant. The existing PVC flat cable elastic material will produce a large amount of harmful substances during use, manufacture or waste gas treatment, which will cause certain harm to human health, and will emit a large amount of thick smoke when burning, which has poor safety and has been difficult to meet the demand.

[0003] In this regard, the Chinese invention patent CN103881242B discloses a wear-resistant and halogen-free flame-retardant elastic material for high-speed elevator flat cables. The elastic material overcomes the defects of the PVC flat cable elastic material. The physical blending of various resins greatly increases the difficulty of mixing the system, and it is more difficult to control the interface compatibility and boundary of various resins stably, resulting in higher requirements for the accuracy and fluctuation range of technical parameters in the process of processing. Strict, otherwise it is easy to produce uneven product quality between batches, and it is also prone to defective products; in addition, in order to improve the wear resistance and bending resistance of elastic materials, more functional elastomers TPU and The mixture of SEBS not only adds one more step to the processing procedure to obtain the aforementioned mixture, but also the price of the two functional elastomers is relatively expensive, which makes the production cost higher

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