Halogen-free flame retardant LLDPE (linear low density polyethylene) material and preparation method thereof

Abstract

The invention discloses a halogen-free flame retardant LLDPE material and a preparation method thereof. The material comprises the components in parts by weight as follows: 100 parts of LLDPE resin, 10-30 parts of a toughening compatilizer, 10-20 parts of a lubricating dispersing agent and 350-450 parts of halogen-free composite flame retardant, wherein the halogen-free composite flame retardant comprises magnesium hydroxide / aluminum hydroxide, zinc borate and microencapsulated red phosphorus in a weight ratio of (10.5-11.5):1: (1.05-1.15). The preparation method of the material comprises the steps as follows: components are poured into a high-speed mixer for mixing until the temperature is increased to 90 DEG C-105 DEG C; the components are discharged, cooled and extruded in a melting manner; then, the components are cooled in a water tank; and finally, the material is obtained through traction granulation. The halogen-free flame retardant LLDPE material has a good flame retardant property, and the limit oxygen index is higher than 40 %; and meanwhile, a mechanical property is excellent, the tensile strength is higher than 18 MPa, and the breaking elongation ratio is higher than 75%.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a halogen-free flame-retardant linear low-density polyethylene material and a preparation method thereof. Background technique [0002] Linear low-density polyethylene (LLDPE for short) is a general-purpose plastic with the advantages of wide source, low price, light specific gravity, non-toxic, corrosion resistance, easy molding and processing, etc. It is widely used in pipes, architectural decoration, wire and cable, foam Production of materials and other products. LLDPE itself is a flammable and combustible material with an oxygen index of 17%. When burning, it has a high heat release rate, a large calorific value, a fast flame propagation speed, and is not easy to extinguish. This brings great hidden dangers to the safe use of LLDPE materials. [0003] Chinese patent document CN103232631A discloses a halogen-free low-smoke flame-retardant cable sheath m...

AI Technical Summary

Problems solved by technology

The shortcomings of this literature are: (1) Although the smoke density is effectively controlled, the flame retardant performance is not good, and the limiting oxygen index is lower than 40%; (2) The mechanical properties of the synergistic flame retardant using microencapsulated red phosphorus are not good , the tensile strength is only about 12MPa, and the elongation at break is less than 60%.