Analysis Of Several Properties Of Polypropylene Non Woven Fabric

1. Physical properties

Polypropylene non woven fabric  is a non-toxic, odorless, milky white high-crystalline polymer, which is one of the lightest varieties of all plastics at present. It is particularly stable to water, and the water absorption rate in water for 14 hours is only 0.01%. The molecular weight is between 80,000 and 150,000, and the formability is good. However, due to the large shrinkage rate, the original wall products are easy to dent, the surface gloss of the products is good, and it is easy to color.

2. Mechanical properties

Polypropylene non woven fabric  has high crystallinity and regular structure, so it has excellent mechanical properties, and its strength, hardness and elasticity are higher than that of high-density PE (HDPE). The outstanding feature is the bending fatigue resistance (7×10^7) times of opening and closing, and no damage marks. The dry friction coefficient is similar to that of nylon, but it is not as good as nylon under oil lubrication.

3.Thermal properties

Polypropylene non woven fabric  have good heat resistance, the melting point is 164~170℃, and the products can be sterilized at temperatures above 100℃. Under the action of no external force, it will not deform at 150 °C. The embrittlement temperature is -35 °C, and embrittlement occurs below -35 °C, and the heat resistance is not as good as PE.

4. Chemical stability

Polypropylene non woven fabric  has good chemical stability. In addition to being eroded by acid, it is relatively stable to other chemical reagents, but low molecular weight aliphatic hydrocarbons, aromatic hydrocarbons, etc., can make Polypropylene non woven fabric  stable. The cloth softens and swells, and the chemical stability increases with the increase of crystallinity. Therefore, Polypropylene non woven fabric  are suitable for making Russian-Chinese chemical pipelines and accessories, and have good anti-corrosion effects.

5. Electrical properties

Polypropylene non woven fabric  have excellent high-frequency insulation properties. Because it hardly absorbs water, the insulation properties are not affected by humidity, have a high dielectric coefficient, and can be used to make heat-resistant fabrics with increasing temperature. The electrical insulation products are also high in breakdown voltage, suitable for electrical accessories, etc. It has good resistance to voltage and arc, but has high static electricity, and it is easy to age when it is in contact with copper.

6. Weather resistance

Polypropylene non woven fabric  are very sensitive to ultraviolet rays, and the addition of zinc oxide dilauryl thiopropionate, carbon black and similar milky white fillers can improve its aging resistance.