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[Chemical Knowledge]：Properties and Uses of Plasticizers

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The nature and use
of plasticizers in the field of chemical production raw materials
1. Introduction

Plasticizers are the most important type of plastic processing aids, and their dosage is the largest, accounting for more than half of the total amount of plastic additives. Plasticizers are generally not used alone in plastics, but are mixed with resins, stabilizers, fillers, etc. to improve the flexibility, ductility, plasticity, cold resistance, heat resistance and impact resistance of plastic products. There are many kinds of plasticizers. According to their chemical structure and performance characteristics, they can be divided into phthalic acid esters, aliphatic dibasic acid esters, trimellitic acid esters, phosphoric acid esters, chlorine-containing compounds and so on. Among them, phthalate plasticizers are the most widely used plasticizers in plastic processing because of their good overall performance, and their output and consumption account for about 3/4 of the total amount of plasticizers.

2. the nature of plasticizer

the nature of plasticizer mainly includes the following aspects:

1. physical properties: the physical properties of plasticizer such as boiling point, melting point, density, refractive index, viscosity, etc., for its application and performance in plastic processing has an important impact.
2. Chemical properties: The chemical properties of plasticizers include their stability, weather resistance, oil resistance, chemical resistance, etc., which determine their application under different environmental conditions.
3. Compatibility with resins: The compatibility of plasticizers with resins is a key factor affecting their plasticizing effect. Plasticizers with good compatibility can be better dispersed evenly in resins and improve the performance of plastics.

3. the use of plasticizer

plasticizer widely used, mainly used in the following aspects:

1. plastic processing: plasticizer is an essential additive in plastic processing, can improve the flexibility of plastic, ductility, plasticity and other properties, making plastic products more easy to process and use.
2. Coatings and adhesives: Plasticizers are also widely used in coatings and adhesives to improve their flexibility and weather resistance.
3. Cellulose plastics: In cellulose plastics, plasticizers can improve the flexibility and processability of plastics and improve their brittleness.

4. the mechanism of action of plasticizer

plasticizer mechanism mainly has the following aspects:

1. Reduce the glass transition temperature: plasticizer can reduce the glass transition temperature of plastic, making plastic at low temperatures become more flexible and elastic.
2. Increase the free volume: Plasticizer molecules can be inserted between the resin molecular chains to increase the free volume, thereby reducing the interaction between the molecular chains and improving the flexibility of the plastic.
3. Improve processing performance: Plasticizers can reduce the melt viscosity of plastics, improve their processing performance, making plastics easier to mold.

5. Conclusion

In short, plasticizers play an important role and are widely used in the field of chemical production raw materials. Different types of plasticizers have different properties and uses, so in practical applications, it is necessary to select suitable plasticizers according to specific needs and conditions. At the same time, with the continuous improvement of environmental awareness and people's attention to the safety of plastic products, the development of environmentally friendly, safe and efficient plasticizers has also become an important direction of current research.

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