2,Mechanical properties
PP has high crystallinity and regular structure, so it has excellent mechanical properties. The most outstanding property of PP is its resistance to bending fatigue.
3,Thermal performance
PP has good heat resistance, the product can be sterilized at a temperature above 100℃, and does not deform at 150℃ under the condition of no external force. Embrittlement temperature is -35℃, embrittlement will occur below -35℃, cold resistance is not as good as PE and other gauge increase or molecular weight reduction is conducive to the improvement of thermal performance.
4,Chemical stability
The chemical stability of PP is very good, except for concentrated sulfuric acid, concentrated nitric acid erosion, to a variety of other chemical reagents are relatively stable; but low molecular weight of aliphatic hydrocarbons, aromatic hydrocarbons and chlorinated hydrocarbons can make polypropylene softening and swelling, while its chemical stability with the increase in crystallinity has also improved, so PP is suitable for making a variety of chemical pipes and fittings, good corrosion prevention.
5,Electrical performance
PP has excellent high-frequency insulation performance, and because it hardly absorbs water, the insulation performance is not affected by humidity. It has a high dielectric coefficient, and with the rise of temperature, it can be used to make electrical insulation products subject to heat. It also has a high breakdown voltage, which makes it suitable for use as electrical fittings, etc. It has good resistance to voltage and arc, but high static electricity. The presence of side methyl groups in PP causes alternating tertiary carbon atoms on the molecular chain, which are highly susceptible to oxidation reactions when in contact with copper ions, resulting in poor oxidation and radiation resistance of polypropylene. Therefore, copper inhibitors must be added for use in contact with copper.
6,Weather resistance
PP is sensitive to ultraviolet light and needs to add additives to improve its aging resistance. Commonly used are UV absorbers and UV quenching agents, etc. PP-TD20 is an enhanced modified material of PP material, TD20 is 20% talcum powder, which means 20% talcum powder filling.
7,High temperature performance
Specimen (150±2) × (70±2) × (3.2±0.2) mm × 3 pieces, PP material at 90±2°C, the shape and surface are not allowed to damage the change of performance, no discoloration. PP-TD20 at 110±2°C, the shape and surface are not allowed to damage the change of performance, no discoloration.
8,Low temperature performance
Specimen (150±2) × (70±2) × (3.2±0.2) mm × 3 pieces, test temperature at (-40±2) °C storage time of (24±2) h, and then immediately after heating to (23±2) °C, the sample does not appear cracks and other defects.
9,Heat resistance aging
Test in accordance with GB/T 7141 test method, size (150±2) × (70±2) × (3.2±0.2) mm × 3 specimens in (150±2) ° C circulating air, the specific requirements of the specimen and the parts of the ambient temperature, such as cabin > = 1000h, near the cabin parts > = 700h, other parts > = 400h.
10,Light aging resistance
Specific and parts affected by the intensity of sunlight, the horizontal and vertical surface, etc.
11,Scratch resistance
According to the method specified in Q/JLY J7110536, Δ<=1.5 (load 10N, scratch head 1.0mm).
12.Burning performance
According to Q/JLY J7110335B-2019, the burning rate is required to be 80mm/min.