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[Chemical Knowledge]：Properties and uses of recycled PP

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The nature and use of recycled PP plays an important role in the field of raw materials for chemical production. Recycled PP is made of waste polypropylene materials through crushing, cleaning, plasticizing, granulation and other processes. Compared with virgin PP, recycled PP has some differences in properties, but it still has a wide range of applications in many aspects. In this paper, the nature and use of recycled PP will be discussed in detail.

1. the properties of recycled PP

1. Physical properties
The physical properties of recycled PP are affected by the source, quality, processing technology and other factors of waste polypropylene materials. In general, the appearance of recycled PP is light yellow or light gray, with good plasticity. However, due to the high temperature and shear in the regeneration process, the molecular weight distribution of recycled PP is wide and the molecular weight is low, so its mechanical properties such as tensile strength and bending strength are relatively low.

2. chemical properties The chemical properties of
regenerated PP are similar to those of original PP, with good acid resistance, alkali resistance, salt resistance, organic solvent resistance and other properties. However, due to the recycled PP in the production process may be mixed with some impurities, such as pigments, additives, etc., so its chemical resistance may be slightly reduced.

2. the use of recycled PP

recycled PP has a wide range of uses in the field of raw materials for chemical production. The following are its main applications:

1. Plastic modified
recycled PP can be used as a raw material for plastic modification, blended with virgin PP or other polymers to improve the performance of materials. By adding some additives, the processability, mechanical properties, and thermal properties of recycled PP can be improved.

2. Preparation of chemical products
Regenerated PP can be used to prepare some chemical products, such as plastic pipes, plates, profiles, etc. These products have the advantages of good corrosion resistance, insulation, portability, etc., and are widely used in construction, automobiles, home appliances and other fields.

3. Preparation of environmentally friendly products
recycled PP, as an environmentally friendly material, can be used to prepare some environmentally friendly products, such as trash cans, environmentally friendly bags, etc. These products can not only effectively use waste polypropylene materials, but also improve the utilization rate of resources and reduce environmental pollution.

3. the application prospect of recycled PP

With the improvement of people's awareness of environmental protection and the increasing shortage of resources, the application prospect of recycled PP is becoming more and more broad. In the future, recycled PP will be used in more fields, such as the preparation of high-performance composite materials and 3D printing. At the same time, with the continuous progress of technology, the performance of recycled PP will be further improved to meet more application requirements.

4. conclusion

In conclusion, recycled PP as an important raw material for chemical production has a wide range of applications. Its nature and use depend on the source, quality, processing technology and other factors of waste polypropylene materials. In the future development, we need to continuously improve the production technology and application level of recycled PP to meet the growing market demand. At the same time, we also need to strengthen the environmental protection supervision in the production and use of recycled PP to ensure its environmental friendliness.

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