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

Abstract

The invention discloses a halogen-free flame-retardant linear low-density polyethylene material and a preparation method thereof. The material is prepared from the following components in parts by weight: 100 parts of LLDPE resin, 10-30 parts of a toughening compatibilizer, a lubricant 10-20 parts of dispersant, 350-450 parts of halogen-free composite flame retardant; halogen-free composite flame retardant is composed of magnesium hydroxide / aluminum hydroxide, zinc borate and microcapsule red phosphorus according to (10.5-11.5):1:( 1.05~1.15) weight ratio composition. The preparation method of the material is as follows: pour the components into a high-speed mixer and mix until the temperature rises to 90°C to 105°C, the material is cooled, melted and extruded, then cooled in a water tank, and finally pulled and pelletized. The halogen-free flame-retardant linear low-density polyethylene material of the invention has good flame-retardant performance and a limiting oxygen index of more than 40%; meanwhile, it has excellent mechanical properties, has a tensile strength of more than 18 MPa and an elongation at break of more 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%.