Which raw material we often use in producing nonwoven?
The answer is this tiny transparent particle-polypropylene.
Why do we choose this kind of transparent granular material like rice grains as raw material?
1. Colorless, odorless, tasteless, non-toxic, and the lightest of commonly used resins
2. Excellent mechanical properties, including tensile strength, compressive strength and hardness, outstanding rigidity and bending fatigue resistance. The movable hinge made of PP can withstand more than 7×107 times of folding and bending without damage
3. Good heat resistance, can be used above 100 ℃, up to 120 ℃ under light load, the highest continuous use temperature under no-load conditions can reach 120 ℃, and the short-term use temperature is 150 ℃. It has good resistance to boiling water and steam, and is particularly suitable for the preparation of medical high-pressure sterilization products.
4. Good chemical stability. Except for strong oxidants, it does not react with most chemicals. Solvents cannot dissolve PP at room temperature. Only some halogenated compounds, aromatic hydrocarbons and high-boiling point aliphatic hydrocarbons can make it swell, such as soluble in tetralin, decalin and 1,2,4-trichlorobenzene at high temperature.
5. PP has excellent electrical insulation performance. The influence of environmental and electric field frequency changes on its electrical properties is not significant. It is an excellent dielectric material and electrical insulation material and can be used as a high-frequency insulation material.
6. Since there are many tertiary carbon atoms with methyl groups on the main chain of PP, the hydrogen on the tertiary carbon atoms is easily attacked by oxygen. Therefore, PP has poor weathering resistance and is easily degraded under the action of oxygen and ultraviolet rays.
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