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[Chemical Knowledge]：Production and manufacturing method and process flow of polypropylene recycled material

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The manufacturing method
of polypropylene recycled material
1. Introduction

polypropylene (PP) is a common plastic material with excellent thermoplasticity, chemical resistance and electrical insulation, and is widely used in the field of raw materials for chemical production. With the extensive use of polypropylene products, the recycling of waste polypropylene materials has gradually become an important issue. This paper will introduce a manufacturing method of polypropylene recycled materials, which aims to improve the utilization rate of waste polypropylene materials, reduce production costs and promote sustainable development.

2. materials and methods

1. Material

waste polypropylene materials, catalysts, additives, etc.

2. Equipment

twin-screw extruder, pelletizer, mixer, etc.

3. Manufacturing process

(1) Crushing and cleaning: crushing waste polypropylene materials into small pieces, cleaning to remove the oil and other impurities.

(2) Drying: The cleaned polypropylene chips are dried to remove moisture therein.

(3) Ingredients: According to a certain proportion, the dried polypropylene chips, catalysts, additives, etc. are added to the mixer and mixed evenly.

(4) Extrusion granulation: the mixture after the ingredients are added to the twin-screw extruder, after heating, melting, extrusion, drawing, cooling, cutting and other processes, into recycled polypropylene particles.

(5) Post-treatment: The recycled polypropylene particles are subjected to post-treatment such as screening and impurity removal to obtain qualified recycled materials.

3. results and discussion

1. Performance
of recycled material
The recycled polypropylene material produced by the above process has good thermoplasticity, chemical resistance and electrical insulation, which can meet the requirements of most chemical products production. Compared with the original polypropylene material, the performance of the recycled material is slightly reduced, but the gap is not large, and it can replace the original material in many occasions.

2. Analysis of influencing factors

(1) Types and quality of waste polypropylene materials: Different types of waste polypropylene materials have large differences in composition and performance, which have a great influence on the performance of recycled materials. Therefore, when selecting waste polypropylene materials, it is necessary to detect and classify them according to their sources and ingredients to ensure the stable quality of recycled materials.

(2) Selection of catalysts and promoters: Catalysts and promoters also have an important influence on the performance of recycled materials. The melt index and tensile strength of recycled materials can be improved by selecting suitable catalysts and additives.

(3) Control of manufacturing process: The control of manufacturing process is very important to the performance of recycled materials. It is necessary to reasonably control the temperature, pressure, speed and other parameters of each process to ensure the quality and output of recycled materials.

4. conclusion

This paper introduces a manufacturing method of polypropylene recycled material, through crushing cleaning, drying, batching, extrusion granulation and post-processing, waste polypropylene material can be converted into qualified recycled material. This method can improve the utilization rate of waste polypropylene materials, reduce production costs, and promote sustainable development. At the same time, the performance of the recycled material is slightly lower than that of the original material, but it can replace the original material in many occasions and has a certain market prospect.

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