Flame-retardant low-smoke halogen-free silane-free crosslinked polyethylene cable material and preparation method thereof

Abstract

The invention discloses a flame-retardant low-smoke halogen-free silane-free crosslinked polyethylene cable material and a preparation method thereof. The flame-retardant low-smoke halogen-free silane-free crosslinked polyethylene cable material is prepared from the following raw materials in parts by weight: 9.3 to 9.4 parts of polyolefin resin, 0.1 to 0.2 part of a flame retardant, 0.1 to 0.2 part of a polymerization inhibitor, 0.15 to 0.2 part of a compatilizer, 0.1 to 0.2 part of a catalyst, 0.15 to 0.25 part of a radiation-free crosslinking sensitizer, 0.1 to 0.2 part of an antioxidant, 0.1 to 0.2 part of an initiator, 0.1 to 0.2 part of a coupling agent and 0.1 to 0.2 part of an auxiliary agent. According to the flame-retardant low-smoke halogen-free silane-free crosslinked polyethylene cable material disclosed by the invention, a composite material with excellent mechanical property, flame-retardant property and processability is obtained through optimal design of a formula of the flame-retardant low-smoke halogen-free silane-free crosslinked polyethylene cable material, and the technical requirements of a halogen-free flame-retardant polyolefin insulating material are met.

Description

【Technical field】 [0001] The invention relates to the technical field of flame-retardant insulating materials, in particular to a flame-retardant low-smoke, halogen-free, silane-free cross-linked polyethylene cable material and a preparation method thereof. 【Background technique】 [0002] Polyvinyl chloride (PVC) resin is mainly used in wire and cable, and PVC resin is currently the second largest resin species in the world after polyethylene. PVC resin is widely used in the cable industry due to its advantages of good rigidity, high strength, corrosion resistance, good electrical insulation, good processing performance and low price. PVC cable materials are mainly used as sheath materials for various cables such as power cables, control cables, and communication cables. PVC cable material is based on polyvinyl chloride, adding stabilizers, dioctyl phthalate, diisodecyl phthalate, dioctyl terephthalate, trioctyl trimellitate, etc. Plasticizers and inorganic fillers such as...

AI Technical Summary

Problems solved by technology

The highest long-term temperature resistance grade of traditional PVC wire and cable materials can only reach 105°C. Once the current is too high or the load is high, the traditional PVC wire and cable is extremely prone to sol cracking and fire, and it is easy to generate a lot of smoke and damage the surrounding environment. environmental pollution

[0004] At present, there are many high flame-retardant PVC sheathing materials in the domestic cable field, but they are easy to carbonize when large-scale flames burn, and the material is easy to fall off from the cable surface, causing huge damage to the actual use of the cable, and even interrupting the operation. During the combustion process, a large amount of toxic smoke and corrosive gas will be produced, which will suffocate and poison people, which will not only cause great harm to escapees and rescuers but also pollute the environment.

Chinese patent application CN107619560A discloses a high temperature resistant flame retardant PVC cable material, the high temperature resistant flame retardant PVC cable material is composed of the following components by weight: 120-150 parts of polyvinyl chloride, 5-10 parts of magnesium aluminum alloy, 50-100 parts of flame retardant, 20-50 parts of dispersant and 5.2-10 parts of composite flame retardant synergist, the flame retardant in this patent is as high as 50-100 parts, accounting for 25-31% of raw materials, although The flame retardant performance of the cable is improved, but the addition of a large amount of flame retardant will cause the decline of the mechanical properties, volume resistivity and low temperature resistance of the cable

Chinese patent application CN105482296A discloses a light heat-resistant flame-retardant modified PVC resin compound cable material and its preparation method. The cable material is made of the following raw materials in parts by weight: PVC resin 55-65, ethylene-vinyl acetate copolymer 30-40, tomarin 0.01-0.02, expandable graphite 10-15, polytetramethylene glycol ether 5-8, aluminum silicate 15-22, oleic acid 3-4, hexamethyldiazosilane 3-4, cotton pulp 22-30, zinc stearate 2-4, diethylene glycol dibenzoate 14-18, color masterbatch 8-10, additives 2-3; the cable material combines PVC resin with Ethylene-vinyl acetate copolymer is blended as a resin base material, and the modified cotton pulp is used as a filler, combined with additives and other auxiliary materials that can improve processing performance, making this cable material compared to traditional PVC When the resin is used, it shows better heat resistance and flame retardancy, but it adds more expandable graphite to the resin base material. Since the expandable graphite is a conductor, adding it as a filler to the cable material will greatly reduce the Reduce its insulation performance, leading to dangers such as electric leakage and electric shock, which has great potential safety hazards

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