Lightweight, environment-friendly and flame-retardant bast fiber reinforced polypropylene composite material and preparation method thereof

Abstract

The invention discloses a lightweight, environment-friendly and flame-retardant bast fiber reinforced polypropylene composite material and a preparation method thereof. The polypropylene composite material comprises 40-77.6% of polypropylene resin, 5-40% of bast fibers, 10-30% of flame retardant, 5-10% of toughening agent, 0.2-3% of nano synergistic flame retardant, 2-5% of wood fiber carbon-forming accelerant, 0-3% of coupling agent, 0.2-1% of antioxidant and 0-1% of lubricating agent. The lightweight, environment-friendly and flame-retardant bast fiber reinforced polypropylene composite material and the preparation method thereof have the advantages that polypropylene is used as the base material, the bast fibers are used as the reinforcement, the synergistic effects of halogen-free intumescent flame retardant, the nano synergistic flame retardant and the wood fiber carbon-forming accelerant are utilized, a banburying-extrusion two-stage continuous processing method is used, and accordingly the prepared composite material is excellent in flame retardance, and the bast fibers are evenly dispersed in the matrix.

Description

technical field [0001] The invention belongs to the field of polymer materials, in particular to a light-weight, environment-friendly, flame-retardant hemp fiber-reinforced polypropylene composite material and a preparation method thereof. Background technique [0002] Polypropylene (PP) resin has the advantages of small specific gravity, good heat resistance stability, excellent chemical resistance and excellent processing and molding. It is widely used in various industries such as home appliances, automobiles, and electronic appliances. It is currently one of the most widely used general-purpose plastics. one. Due to its excellent tensile strength, modulus and heat resistance stability, glass fiber is widely used in resin reinforcement and modification, but glass fiber has certain limitations, high energy consumption, and glass fiber wool will cause harm to the human body. Recycling difficulty. In recent years, with the increasingly prominent global energy and environme...

AI Technical Summary

Problems solved by technology

However, the essential characteristics of plant fiber make it flammable. With the public's emphasis on safety, the home appliances and household fields have put forward higher requirements for the flame retardancy of materials. Therefore, in order to further expand the hemp fiber reinforced polypropylene The application field of the material needs to be flame retardant modified

[0003] In the published Chinese patent CN104650541A, the preparation of flame-retardant modified ramie reinforced epoxy resin composite material mainly adopts the following methods: 1) firstly carry out flame-retardant modification of ramie, and use solution impregnation, ultraviolet irradiation, Soxhlet pumping 2) compound with epoxy resin to obtain flame-retardant ramie fiber reinforced epoxy resin material; this method is complex to the pretreatment process of ramie fiber, takes longer time, consumes a lot of energy, and uses a large amount of Solvents bring a lot of inconvenience to industrial production, and also destroy the ecological and environmental protection characteristics of plant fibers

[0004] In the patent CN104163983A, the preparation of a ramie fiber reinforced polypropylene composite material is mentioned, which is characterized in that: 1) the ramie fiber is pre-coated with a polymer solution (solvent is ethylene dichloride) in a heated state, and then Drying treatment; 2) Extrusion processing to prepare composite materials; dichloroethane used in this method is toxic and carcinogenic, and after heating and coating on the fiber surface, the residual toxic solvent limits the subsequent use of composite materials

[0005] In summary, the existing hemp fiber-reinforced polypropylene materials have the following problems in production and application: 1. The commonly used hemp fiber treatment process is complicated and not environmentally friendly; 2. The heat resistance and stability of plant fibers are poor and flammable ; 3. Only the flame retardant modification of hemp fiber cannot guarantee the flame retardant performance of the composite reinforcement system

These defects limit the wide application of hemp fiber-reinforced polypropylene materials. Therefore, it is one of the important issues to be solved urgently to find a simple and environmentally friendly processing method for flame-retardant modification of hemp fiber-reinforced polypropylene materials.

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