A Brief Introduction to the Properties and Application Fields of PET Plastic

PET plastic is the abbreviation for Polyethylene terephthalate in English, abbreviated as PET. As a small variety in the plastic classification, what are its properties? What are the application areas?

First, the performance of PET plastic

1. PET is a milky white or light yellow highly crystalline polymer with a smooth and glossy surface.

Creep resistance, fatigue resistance, friction resistance and dimensional stability, small wear and high har

dness, with the greatest toughness of thermoplastics.

Good electrical insulation performance, little affected by temperature, but poor corona resistance. Non-toxic, weather resistance, good stability against chemicals, low water absorption, resistance to weak acids and organic solvents, but not heat resistant water immersion, not alkali resistance.

2. The glass transition temperature of PET resin is high, the crystallization speed is slow, the molding cycle is long, the molding cycle is long, the molding shrinkage rate is large, the dimensional stability is poor, the crystallization molding is brittle, and the heat resistance is low.

Second, PET plastic modification treatment

It can be understood from the above performance that PET plastics have the advantages of high rigidity, high temperature dimensional stability, high temperature color stability, creep resistance, good surface gloss, easy coloring, and cost-effective.

However, in addition to the advantages, there are also significant disadvantages, such as slow crystallization speed at the mold temperature (70 ~ 110 ° C), poor impact performance and hygroscopic problems. But these shortcomings are not impossible to change, through "modification", you can effectively solve these problems.

Modified PET can have the following five characteristics:

1.Improve mechanical properties: 

The bending strength of modified plastics reaches 200MPa, the elastic modulus reaches 4000MPa, the creep resistance and fatigue are also better, the surface hardness is improved, and the mechanical properties are similar to thermosetting plastics.

2. Improve heat resistance:

Modification treatment can improve the thermal stability of plastics, so that they can maintain stable performance in high temperature environment.

3. Improve weather resistance:

Modification treatment can enhance the resistance of plastics to adverse external factors such as UV light, moisture and oxidation.

4. Improve cost performance:

PET plastics and reinforced PET plastics are highly cost-effective engineering plastics because ethylene glycol used in PET production is almost half the price of butanediol used in PBT production.

5. Improve appearance:

The modified treatment can make the plastic surface lubricated, anti-static, anti-adhesion and easy to clean, and can change the color of the plastic.