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CN-122011623-A - Low-smoke low-halogen flame-retardant medium-low-temperature fireproof PVC cable sheath material and preparation method thereof

CN122011623ACN 122011623 ACN122011623 ACN 122011623ACN-122011623-A

Abstract

The invention discloses a low-smoke low-halogen flame-retardant medium-low temperature fire-resistant PVC cable sheath material and a preparation method thereof, and belongs to the technical field of wire and cable materials. The sheath material is prepared by taking PVC resin as a matrix, matching with a composite stabilizer, an environment-friendly plasticizing system, a flame-retardant synergistic system, a fireproof auxiliary agent and a functional filler, premixing, melting extrusion, cooling and granulating. According to the invention, food contact grade acetyl tributyl citrate (ATBC), epoxy fatty acid methyl ester and other environment-friendly plasticizers are adopted to replace traditional plasticizers, and a magnesium hydroxide-cerium oxide flame-retardant synergistic system is innovatively compounded, so that the product has the advantages of low smoke, low halogen, high flame retardance, fire resistance, wide temperature range stability and the like, and can be stably used for a long time at-20 ℃ to 105 ℃. The preparation process is simple, is easy to industrialize, and is suitable for the field of high-safety-level wire and cable jackets.

Inventors

  • LI ZHIQIANG
  • Zhu Mixia

Assignees

  • 李志强

Dates

Publication Date
20260512
Application Date
20260314

Claims (8)

  1. 1. The low-smoke low-halogen flame-retardant medium-low temperature fire-resistant PVC cable sheath material is characterized by being prepared from the following raw material components in parts by weight: 100 parts of PVC resin; 2.5-4.5 parts of composite stabilizer; 8-15 parts of low smoke plasticizer; 15-25 parts of a flame-retardant synergistic system; 5-10 parts of a fire-resistant auxiliary agent; 10-20 parts of functional filler; The flame-retardant synergistic system is formed by compounding a magnesium hydroxide flame retardant and a cerium oxide synergistic agent according to a mass ratio of 4:1, wherein the fire-retardant auxiliary agent is at least one of ammonium polyphosphate or red phosphorus, and the low-smoke plasticizer is at least one of epoxy fatty acid methyl ester, acetyl tributyl citrate and epoxy linseed oil.
  2. 2. The low-smoke low-halogen flame-retardant medium-low temperature fire-resistant PVC cable sheath material according to claim 1, wherein the PVC resin is polyvinyl chloride homo-or copolymer resin with an average polymerization degree of 800-1300.
  3. 3. The low-smoke low-halogen flame-retardant medium-low temperature fire-resistant PVC cable sheath material according to claim 1, wherein the composite stabilizer is compounded by a calcium-zinc composite stabilizer and an organic tin stabilizer.
  4. 4. The low-smoke low-halogen flame-retardant medium-low temperature fire-resistant PVC cable sheath material according to claim 3, wherein the mass ratio of the calcium-zinc composite stabilizer to the organotin stabilizer is 1:1.
  5. 5. The low-smoke low-halogen flame-retardant medium-low temperature fire-resistant PVC cable sheath material according to claim 1, wherein the functional filler is superfine calcium carbonate or white carbon black with the surface treated by a coupling agent.
  6. 6. The low-smoke low-halogen flame-retardant medium-low temperature fire-resistant PVC cable sheath material according to claim 5, wherein the coupling agent is a silane coupling agent or a titanate coupling agent.
  7. 7. A method for preparing the low smoke, low halogen, flame retardant medium and low temperature fire resistant PVC cable sheathing compound according to any one of claims 1 to 6, comprising the steps of: (1) Premixing, namely weighing PVC resin, a composite stabilizer and a low smoke plasticizer according to parts by weight, putting into a high-speed mixer, and mixing for 5-10 minutes to uniformity at 80-100 ℃; (2) Adding filler and flame-retardant system, namely adding flame-retardant synergistic system, fire-retardant auxiliary agent and functional filler into the mixture, and continuously mixing for 3-5 minutes; (3) Melt extrusion, namely feeding the mixed material into a double-screw extruder, controlling the temperature to be 160-180 ℃, and carrying out melt plasticization and mixing extrusion; (4) Cooling and granulating, namely cooling, drying and granulating the extruded melt to obtain a finished product.
  8. 8. The process of claim 7, wherein in step (3) the twin-screw extruder has an aspect ratio of 30-40:1 and a screw speed of 300-500r/min.

Description

Low-smoke low-halogen flame-retardant medium-low-temperature fireproof PVC cable sheath material and preparation method thereof Technical Field The invention relates to the technical field of wire and cable materials, in particular to a low-smoke low-halogen, environment-friendly nontoxic and high-flame-retardant fireproof PVC cable sheath material suitable for medium-low temperature environment and high safety level requirements and a preparation process thereof. Background Polyvinyl chloride (PVC) cable material is widely applied in the wire and cable industry because of low cost, easily available raw materials, good corrosion resistance and good insulating property. However, the following technical pain points are common in the conventional PVC sheathing compound: 1. the environment protection performance is poor, a large amount of hydrogen halide gas and dense smoke are released during combustion, so that not only is precision equipment corroded, but also 'secondary disasters' are generated, the personnel evacuation safety is seriously endangered, and the safety standard of modern green building materials is not met; 2. The flame retardant and fire resistant performance is insufficient, the flame retardant and fire resistant performance is easy to burn quickly and drip under the invasion of high-temperature flame, and the flame retardant time limit is short, so that the spread of fire can not be effectively blocked and the cable core body can not be protected when a fire disaster occurs; 3. The temperature range adaptability is limited in that the alloy is easy to harden and crack under the low-temperature (below-20 ℃) environment and lose mechanical protection performance, and is easy to soften and deform under the high-temperature (above 105 ℃) environment, so that the alloy is difficult to meet the long-term stable use requirement under severe working conditions. Although some halogen-free flame retardant materials are already present on the market, the compatibility, mechanical properties and cost of the halogen-free flame retardant materials in a PVC matrix are often difficult to balance. Therefore, based on the excellent mechanical and electrical properties of PVC, the PVC is subjected to low-smoke low-halogenation modification, and an environment-friendly PVC cable sheath material which has high flame retardance and fire resistance and is suitable for wide temperature range change is developed, so that the PVC cable sheath material becomes an urgent need for current industry upgrading. Disclosure of Invention The invention aims to overcome the defects in the prior art and provide the PVC cable sheath material with low smoke, low halogen, excellent flame retardance and fire resistance and stable performance in a medium-low temperature range and the preparation method thereof. Technical proposal In order to achieve the above purpose, the present invention provides the following technical solutions: The low-smoke low-halogen flame-retardant medium-low temperature fire-resistant PVC cable sheath material is prepared from the following raw material components in parts by weight: 100 parts of PVC resin; 2.5-4.5 parts of composite stabilizer; 8-15 parts of low smoke plasticizer; 15-25 parts of flame-retardant synergistic system; 5-10 parts of fire-resistant auxiliary agent; 10-20 parts of functional filler; 0.5-2 parts of other auxiliary agents; The flame-retardant synergistic system is formed by compounding a magnesium hydroxide flame retardant and a cerium oxide synergistic agent according to a mass ratio of 4:1, wherein the fire-retardant auxiliary agent is at least one of ammonium polyphosphate or red phosphorus, and the low-smoke plasticizer is at least one of epoxy fatty acid methyl ester, acetyl tributyl citrate and epoxy linseed oil. Preferably, the PVC resin is polyvinyl chloride homo-or copolymer resin with an average polymerization degree of 800-1300. Preferably, the composite stabilizer is formed by compounding a calcium-zinc composite stabilizer and an organic tin stabilizer. Further preferably, the mass ratio of the calcium-zinc composite stabilizer to the organotin stabilizer is 1:1. Preferably, the functional filler is superfine calcium carbonate or white carbon black with the surface treated by a coupling agent. The coupling agent may be a silane coupling agent or a titanate coupling agent. Preferably, the limiting oxygen index of the sheath material is more than or equal to 32%, the vertical combustion grade reaches the VW-1 standard, and the use temperature is in the range of minus 20 ℃ to 105 ℃. The invention also provides a method for preparing the low-smoke low-halogen flame-retardant medium-low temperature fire-resistant PVC cable sheath material, which comprises the following steps: (1) Premixing, namely weighing PVC resin, a composite stabilizer and a low smoke plasticizer according to parts by weight, putting into a high-speed mixer, and mixing for 5-10 minutes to uniformity at