How to choose new and recycled PVC materials for injection molding

author: Universe plastic

2024-06-13

What is PVC material

PVC is the abbreviation of polyvinyl chloride material. It is a commonly used synthetic plastic material. It is formed by the polymerization reaction of vinyl chloride monomer under the action of initiator. Because of its excellent comprehensive performance, it is widely used in injection molding to produce suitable plastic products in various fields.

With the cost of raw materials and environmental protection needs, PVC recycled materials appear more frequently in injection molding projects, whether to choose new materials or recycled materials, I hope this article’s analysis of their characteristics will help you know how to choose.

Properties of PVC materials

1. High mechanical strength: PVC material has high hardness and strength and can withstand mechanical stress in a wide range.

2. Chemical corrosion resistance: It has good resistance to chemicals such as acids, alkalis and salts, so it is widely used in the chemical industry.

3. Good electrical insulation performance: PVC is an excellent electrical insulation material and is often used in the insulation layer and sheath of wires and cables.

4. Easy to process and form: PVC can be made into products of different shapes and specifications through various processing methods such as extrusion, injection molding, and calendering.

Mechanical properties of PVC materials

density	1.35-1.45 g/cm³	hardness	80-90
Tensile Strength	40-60 MPa	Elastic Modulus	2500-4000 MPa
Bending strength	50-80 MPa	Elongation at break	20-40%
Impact strength	2-5 kJ/m²	Heat distortion temperature	60-80℃

Application of PVC materials

Building materials: PVC pipes, door and window frames, wall panels and floors, etc., are widely used in the construction industry because of their durability, moisture resistance, and corrosion resistance.

Medical equipment: PVC is used to make medical supplies such as infusion bags, infusion tubes, and blood bags. It is hygienic, safe, and easy to process.

Packaging materials: PVC film, plastic wrap, bottles, etc. are widely used in the packaging of food and industrial products.

Daily necessities: toys, shoe soles, tablecloths, raincoats and other daily necessities.

Wires and cables: Due to its good insulation properties, PVC is widely used in the outer sheath and insulation layer of wires and cables.

Parameter comparison of new PVC and recycled PVC

Property	New PVC Material	Recycled PVC Material
density	1.35-1.45 g/cm³	1.35-1.45 g/cm³
Tensile Strength	40-60 MPa	30-50 MPa
Bending strength	50-80 MPa	40-70 MPa
Impact strength	2-5 kJ/m²	1-4 kJ/m²
hardness	80-90	75-85
Elastic Modulus	2500-4000 MPa	2000-3500 MPa
Elongation at break	20-40%	10-30%
Heat distortion temperature	60-80℃	55-75℃

The main differences between new materials and recycled materials

1. Mechanical properties:

New PVC materials have high purity, complete molecular structure, and generally good properties such as mechanical strength, toughness, chemical resistance, and thermal stability. Recycled materials may contain impurities and degradation products, and their performance is generally slightly worse than new materials. The mechanical strength, toughness and heat resistance of recycled PVC may be slightly lower than that of new PVC material.

2. Environmental protection effect:

The use of new materials consumes a large amount of raw resources and energy and produces more environmental pollutants. Recycled materials reduce the demand for original resources and the generation of waste by recycling and reusing waste materials, and are more environmentally friendly.

3. Manufacturing cost:

Because new materials need to be synthesized from raw materials, the production cost is usually higher. Recycled materials make use of waste materials, have relatively low production costs and have high economic benefits.

Conclusion

New and recycled materials each have advantages and disadvantages. When selecting injection molding materials, there are trade-offs based on the performance requirements of the specific application, economic factors and environmental considerations. For application scenarios with high performance requirements, new materials are still the first choice; while in applications that do not require high performance and pay attention to cost and environmental protection, recycled materials have significant advantages.

How to choose new materials and recycled materials for injection molding PS

How to choose ABS new material or recycled material for injection molding