Polypropylene is a common production material for ton bag production and has many performance characteristics. Below you describe the properties of polypropylene.
1. Physical properties. Polypropylene is a non-toxic, odorless, tasteless milky white high crystalline polymer, low density, and is currently one of the lightest varieties of all plastics. It is particularly stable to water, good formability, but because of large shrinkage, thick wall products are easy to sag, for some parts with high dimensional accuracy, it is difficult to meet the requirements, the product surface luster is good, easy to color.
2. Mechanical properties. Polypropylene has excellent mechanical properties because of its high crystallinity and regular structure. The absolute value of the mechanical properties of polypropylene is higher than that of polyethylene. The toughness of polypropylene is greatly affected by temperature and loading rate. Polypropylene has excellent bending fatigue resistance, and its products can be bent hundreds of times at room temperature without damage.
3. Thermal performance. Polypropylene has good heat resistance, products can be disinfected and sterilized at temperatures above 100 ° C, under the condition of no external force, and 150 ° C is not deformed.
4. Chemical stability. The chemical stability of polypropylene is very good, in addition to being eroded by concentrated sulfuric acid and concentrated nitric acid, it is relatively stable for various other chemical agents, and its chemical stability is also improved with the increase of crystallinity.
5. Electrical properties. It has a high dielectric coefficient, and with the rise in temperature, can be used to make heated electrical insulation products. Its breakdown voltage is also very high, suitable for use as electrical accessories.
6. Weather resistance. Polypropylene is very sensitive to ultraviolet rays, adding zinc oxide, dilauryl thiodipropionate, carbon black, or similar opal fillers can improve its aging resistance.
