Product Description
1. Colorless, odorless, tasteless and non-toxic, it is the lightest among 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 folding and bending without damage, but the temperature has a great influence on the impact strength. The impact strength is higher above room temperature, and the impact resistance is poor at low temperature. The tensile strength of PP is generally 21-39 MPa; the bending strength is 42-56 MPa, the compressive strength is 39-56 MPa, the elongation at break is 200%~400%, the notched impact strength is 2.2-5 kJ/m2, and the low temperature notch Impact strength 1-2 kJ/m2. Rockwell hardness R95~105. Its mechanical properties are related to relative molecular mass, crystal size and crystallinity. When the relative molecular weight is low, the crystallinity is high, and the spherulite size is large, the product will have high rigidity and low toughness [1] [11];
3. It has good heat resistance and can be used above 100 ºC, and can reach 120 under light load. ºC, the maximum continuous use temperature under no-load conditions can reach 120 ºC, and the short-term use temperature is 150 ºC. It has good resistance to boiling water and steam, and is especially suitable for preparing medical high-pressure sterilization products. Its linear expansion coefficient is 5.8 ~ 10.2×10-5 K-1, and its thermal conductivity is about 0.15 ~ 0.24 W/(m·K), which is smaller than the thermal conductivity of polyethylene. It is a good thermal insulation material [1] [11 ];
4. It has good chemical stability and does not interact with most chemicals except strong oxidants; solvents cannot dissolve PP at room temperature, and only some halogenated compounds, aromatic hydrocarbons and high-boiling aliphatic hydrocarbons can make it swell. Hydronaphthalene,
5. PP has excellent electrical insulation properties. The influence of the environment and changes in electric field frequency has little impact on its electrical properties. 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 prone to degradation under the action of oxygen and ultraviolet rays. The performance of PP powder without stabilizers will decrease after being left indoors for 4 months. It will become brittle after being aged at 150°C for 0.5 to 3.0 hours or exposed to the sun for 12 days. Therefore, antioxidants, light stabilizers or ultraviolet absorbers must be added during production. agent [1];
7. PP is flammable, with an oxygen index of only 17.4. A large amount of flame retardant is required for flame retardancy. The oxygen transmittance is large and can be improved by surface coating with a barrier layer or multi-layer co-extrusion. The transparency is relatively low. Poor, can be improved by adding nucleating agents; poor surface polarity, good chemical resistance, but poor secondary processing properties such as printing and bonding, which can be improved by surface treatment, grafting and blending [1];
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