Long glass fiber reinforced recycled polypropylene material and preparation method thereof

Abstract

The invention discloses long glass fiber reinforced recycled polypropylene material and a preparation method thereof. The long glass fiber reinforced recycled polypropylene material comprises components according to mass percent: 25-55% of polypropylene, 30-60% of long glass fiber, 0.4-0.8% of coupling agent, 3-8% of graft of thermoplastic elastomer, 0.1-0.3% of fused finger modifier, 0.2-0.4% ofantioxygens, 1-4% of lubricant and 1-3% of selective assistant. The preparation method is as follows: mixing and stirring components except for long glass fiber, and then adding the components exceptfor long glass fiber to a screw extruder; adding long glass fiber, mixing, extruding, cooling, air drying and pelleting; as the fused finger modifier is added, the requirements on polypropylene are reduced; various recycled polypropylene materials can be used as backing material. The preparation method is simple and has low cost; the prepared long glass fiber einforced recycled polypropylene material has good comprehensive performances and can replace a plurality of metal parts to be applied to various fields.

Description

technical field [0001] The invention relates to the reinforcement and modification technology of thermoplastics, in particular to a long glass fiber reinforced recycled polypropylene material and a preparation method thereof. Background technique [0002] The utilization technology of recycled polypropylene is mainly divided into two aspects: physical processing and chemical processing. In terms of chemical processing and utilization technologies, there are mainly: chlorination of polypropylene, cross-linking modification of recycled polypropylene, catalytic cracking and thermal cracking of polypropylene, and other methods. Because there are many technical and equipment limitations in chemical recycling technology, it is generally less used. The most common application is physical processing and utilization, and the most common one is enhancement modification. The traditional method of reinforcement modification is generally realized by adding powders such as calcium carbo...

AI Technical Summary

Problems solved by technology

[0005] There are some shortcomings in the currently disclosed patents of long glass fiber reinforced polypropylene. For example, in the patent publication number CN 101338051A, the long glass fiber needs to be preheated and dried to make the surface temperature reach 60-80°C, and then the long glass fiber Introduce a surface treatment device to infiltrate the surface with a liquid coupling agent. This method requires additional supporting equipment, complex processes, and increased material costs. Moreover, it has a certain selectivity for the base resin, requiring the use of polypropylene with a medium melt index.

Another example is that in the patent with publication number CN 1810870A, unsaturated carboxylic acids or their anhydrides are directly used in the material formula for preparing long glass fiber reinforced polypropylene. Such substances usually pose a great hazard to human health, and can cause Pharyngitis, laryngitis and bronchitis have a strong irritating effect on human eyes and skin, and there is a danger of burning in case of high heat, which poses a great hidden danger to operators and safe operation; moreover, no coupling agent is used in this formula, The effect of improving the interface adhesion between polypropylene and glass fiber is not obvious

Another example is the use of composite blended yarns of polypropylene fibers and glass fibers in the patent CN1962732A to prepare continuous long glass fiber reinforced polypropylene materials. This method requires high selectivity of raw materials, and it is not suitable for granular or powdery polypropylene. Long glass fiber reinforced polypropylene material