Search

CN-121975214-A - Environment-friendly flame-retardant insulating material for cables and preparation method thereof

CN121975214ACN 121975214 ACN121975214 ACN 121975214ACN-121975214-A

Abstract

The invention relates to the technical field of insulating materials, in particular to an environment-friendly flame-retardant insulating material for cables and a preparation method thereof. The environment-friendly flame-retardant insulating material for the cable comprises, by mass, 70-80 parts of polyethylene, 30-40 parts of ethylene-vinyl acetate copolymer, 30-50 parts of flame-retardant filler, 3-5 parts of antioxidant, 5-8 parts of lubricant, 1-2 parts of coupling agent and 1-2 parts of compatilizer. According to the invention, 20-30 parts by mass of modified magnesium hydroxide and 10-20 parts by mass of modified halloysite are compounded to prepare the flame-retardant filler, and the flame-retardant filler is uniformly mixed with polyethylene, ethylene-vinyl acetate copolymer, antioxidant, lubricant, coupling agent and compatilizer, and extruded and granulated by a double-screw extruder to obtain the environment-friendly flame-retardant insulating material for cables, so that the flame-retardant insulating material has excellent mechanical properties and excellent flame-retardant effect.

Inventors

  • YANG GUOXIANG
  • SHI SHUMEI
  • ZHANG XIANG

Assignees

  • 扬州美恒线缆有限公司

Dates

Publication Date
20260505
Application Date
20260312

Claims (9)

  1. 1. The preparation method of the environment-friendly flame-retardant insulating material for the cable is characterized by comprising the following steps of: The environment-friendly flame-retardant insulating material for the cable is prepared by uniformly mixing polyethylene, ethylene-vinyl acetate copolymer, flame-retardant filler, antioxidant, lubricant, coupling agent and compatilizer, extruding and granulating by a double-screw extruder, wherein the flame-retardant filler is prepared by compounding 20-30 parts by mass of modified magnesium hydroxide and 10-20 parts by mass of modified halloysite.
  2. 2. The preparation method of the environment-friendly flame-retardant insulating material for the cable, which is disclosed in claim 1, is characterized by comprising the following raw materials, by mass, 70-80 parts of polyethylene, 30-40 parts of ethylene-vinyl acetate copolymer, 30-50 parts of flame-retardant filler, 3-5 parts of antioxidant, 5-8 parts of lubricant, 1-2 parts of coupling agent and 1-2 parts of compatilizer.
  3. 3. The preparation method of the environment-friendly flame-retardant insulating material for cables, which is disclosed in claim 1, is characterized in that the preparation method of the modified magnesium hydroxide is as follows: Uniformly mixing cyclotriphosphazene modified chitosan, paratoluenesulfonic acid monohydrate and dimethylformamide under the protection of nitrogen, adding maleic anhydride, reacting for 22-24 hours at room temperature, dropwise adding a mixed solution of 2-acrylamide-2-methylpropanesulfonic acid and dimethylformamide, dropwise adding ammonium persulfate after 1-2 hours, heating to 70-80 ℃, continuously reacting for 10-12 hours, and washing and freeze-drying to obtain a carboxyl-containing polymer; And secondly, ultrasonically dispersing magnesium hydroxide in absolute ethyl alcohol, adding a mixed solution of a carboxyl-containing polymer and deionized water, stirring and reacting for 12-15h at the temperature of 125-135 ℃ and the rotating speed of 800-1000r/min, and obtaining modified magnesium hydroxide after centrifugation, washing and freeze drying.
  4. 4. The preparation method of the environment-friendly flame-retardant insulating material for cables, which is disclosed in claim 3, is characterized by comprising the following steps: dispersing chitosan in tetrahydrofuran, adding triethylamine, introducing nitrogen, adding a mixed solution of hexachlorocyclotriphosphazene and tetrahydrofuran under ice bath condition, reacting for 1-2h, heating to 70-80 ℃, continuing to react for 22-24h, filtering, washing and drying the product after the reaction is finished, and obtaining the cyclotriphosphazene modified chitosan.
  5. 5. The preparation method of the environment-friendly flame-retardant insulating material for cables, which is disclosed in claim 1, is characterized in that the preparation method of the modified halloysite is as follows: step A, uniformly mixing 3-aminopropyl triethoxysilane, triethylamine and toluene at room temperature, dropwise adding a mixed solution of hexachlorocyclotriphosphazene and toluene, reacting for 4-6 hours at 100-110 ℃ after 1-2 hours, filtering to obtain filtrate, and performing rotary evaporation to obtain modified organosilicon; And B, uniformly mixing the modified organic silicon and the glacial acetic acid solution to obtain a hydrolysate, ultrasonically dispersing halloysite in the glacial acetic acid solution, dropwise adding the solution into the hydrolysate, completely dripping the solution for 1-2 hours, refluxing and stirring for 6-8 hours at 75-85 ℃, adding ammonia water, continuously refluxing and stirring for 12-16 hours, centrifuging after the reaction is completed, washing the precipitate with deionized water for three times, and freeze-drying to obtain the modified halloysite.
  6. 6. The method for preparing the environment-friendly flame-retardant insulating material for cables, as claimed in claim 1, wherein the antioxidant is any one of antioxidant 168, antioxidant 565, antioxidant 1024 and antioxidant 1010.
  7. 7. The method for preparing the environment-friendly flame-retardant insulating material for cables according to claim 1, wherein the lubricant is any one of polyethylene wax, zinc stearate, calcium stearate and magnesium stearate.
  8. 8. The method for preparing the environment-friendly flame-retardant insulating material for cables according to claim 1, wherein the compatilizer is maleic anhydride grafted polyethylene.
  9. 9. An environmental-friendly flame-retardant insulating material for cables, which is prepared by the preparation method according to any one of claims 1 to 8.

Description

Environment-friendly flame-retardant insulating material for cables and preparation method thereof Technical Field The invention relates to the technical field of insulating materials, in particular to an environment-friendly flame-retardant insulating material for cables and a preparation method thereof. Background With the development of technology and the improvement of environmental awareness, the insulation materials of cables are increasingly required to have the characteristics of environmental protection and flame retardance so as to meet market demands. The conventional cable insulation materials are mostly based on polyvinyl chloride (PVC), cross-linked polyethylene (XLPE) and the like, which may release harmful substances during use and generate toxic gases when burned, thereby seriously threatening the environment and human health. To improve the flame retardant properties of the cable, the industry generally employs flame retardants (e.g., decabromodiphenyl ether and chlorinated paraffin) with halogen (e.g., bromine, chlorine) added, in combination with antimony trioxide. The flame-retardant efficiency of the material is high, but a large amount of corrosive and choking dense smoke and toxic hydrogen halide gas can be generated during combustion, so that rescue and escape in a fire scene are seriously hindered, and meanwhile, the environment durability of combustion products and the bioaccumulation toxicity of halogen flame retardants make the combustion products face substitution demands. Thus, the industry is gradually turning to the use of halogen-free flame retardant technology based on metal hydroxides (e.g. aluminium hydroxide, magnesium hydroxide). However, these halogen-free flame retardant materials generally require a high addition amount to achieve a desired flame retardant effect, which causes a plurality of serious problems. Firstly, in terms of processability, melt viscosity is drastically increased due to high filling amount, fluidity is lowered, and problems such as surface roughness and dimensional instability of a cable are easily generated during extrusion, thereby seriously affecting production efficiency and product quality. Second, the mechanical properties are also significantly reduced, and the toughness, tensile strength and elongation at break of the material are greatly degraded, resulting in cables becoming stiff and brittle, and insufficient bending and impact resistance. In addition, the poor compatibility between the flame retardant and the polymer matrix (e.g., PE, EVA, etc.) results in a weak interfacial bonding force, further exacerbating the loss of mechanical properties, and the tendency for migration and precipitation of the flame retardant particles during processing and use (i.e., the "bloom" phenomenon), leading to attenuation of flame retardant properties and possible contamination of the contact surfaces. Therefore, we propose an environment-friendly flame-retardant insulating material for cables and a preparation method thereof. Disclosure of Invention The invention aims to provide an environment-friendly flame-retardant insulating material for cables and a preparation method thereof, which are used for solving the problems in the prior art. In order to achieve the above purpose, the present invention provides the following technical solutions: the preparation method of the environment-friendly flame-retardant insulating material for the cable comprises the following steps: Uniformly mixing polyethylene, ethylene-vinyl acetate copolymer, flame-retardant filler, antioxidant, lubricant, coupling agent and compatilizer, and extruding and granulating by a double-screw extruder to obtain the environment-friendly flame-retardant insulating material for cables. The environment-friendly flame-retardant insulating material for the cable comprises, by mass, 70-80 parts of polyethylene, 30-40 parts of ethylene-vinyl acetate copolymer, 30-50 parts of flame-retardant filler, 3-5 parts of antioxidant, 5-8 parts of lubricant, 1-2 parts of coupling agent and 1-2 parts of compatilizer. In an optimized scheme, the flame-retardant filler is formed by compounding 20-30 parts by mass of modified magnesium hydroxide and 10-20 parts by mass of modified halloysite. The preparation method of the modified magnesium hydroxide is more optimized scheme as follows: Uniformly mixing cyclotriphosphazene modified chitosan, paratoluenesulfonic acid monohydrate and dimethylformamide under the protection of nitrogen, adding maleic anhydride, reacting for 22-24 hours at room temperature, dropwise adding a mixed solution of 2-acrylamide-2-methylpropanesulfonic acid and dimethylformamide, dropwise adding ammonium persulfate after 1-2 hours, heating to 70-80 ℃, continuously reacting for 10-12 hours, and washing and freeze-drying to obtain a carboxyl-containing polymer; And secondly, ultrasonically dispersing magnesium hydroxide in absolute ethyl alcohol, adding a mixed solution of a carboxyl