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Physical properties of pp non-woven fabric

by:Sunshine     2020-05-07
The physical properties of pp non-woven fabrics, polypropylene is a non-toxic, odorless, tasteless milky high-crystal polymer with a density of only 0. 90--'0. 91g/rm is one of the lightest varieties of all plastics today. It does not change the water, and the water absorption rate in the water is only 0. O1 %, molecular weight about 80 thousand-150 thousand. Good molding, but due to the large shortening rate (For 1% ~ 2. 5%). Thick-walled products are easy to sag. For some parts with high dimensional accuracy, it is difficult to meet the request. The product has good luster and easy coloring. Mechanical properties polypropylene has high crystallization and regular structure, so it has excellent mechanical properties. The absolute value of the mechanical properties of polypropylene is higher than that of polyethylene, but it is still a low variety in plastic materials, and its tensile strength can only reach 30 MPa or slightly higher. Polypropylene with large gauge index has high tensile strength, but as the gauge index advances, the impact strength of the material drops, but it does not change after falling to a certain value. Temperature and loading speed have a great influence on the toughness of polypropylene. When the temperature is higher than the glass transition temperature, the impact damage is toughness fracture, the glass transition temperature is brittle fracture, and the impact strength value is greatly reduced. Forward loading speed can increase the temperature at which the toughness fracture changes to brittle fracture. Polypropylene has excellent anti-disc bending and decadence, and its products can be bent 106 times at normal temperature without damage. However, under the gentle and low temperature of the chamber, the impact strength is poor due to the high regularity of my molecular structure. The most prominent performance of polypropylene is anti-disc and decadent, commonly known as glue. [5] Thermal performance Polypropylene has excellent heat resistance. The product can be disinfected and sterilized at temperatures above 100 ℃, and will not deform at 150 ℃ without external force. Brittle temperature is-35 ℃, below- It will be brittle at 35 °c, and the weather resistance is not as good as polyethylene. The reported glass transition temperature of polypropylene is 18qC, OqC, 5 ℃, etc. This is also due to the different samples used by people, in which the proportion of crystal phase and amorphous phase is different, the amorphous part of the chain in the molecular chain is divided. The melting temperature of polypropylene is about 40-50% higher than that of polyethylene, about 164-170 ℃, and the melting point of polypropylene is 100% ℃ with 176 isogauge. Chemical invariance the chemical invariance of polypropylene is very good. In addition to being eroded by concentrated sulfuric acid and concentrated nitric acid, the other chemical reagents are unchanged; However, low molecular weight fatty hydrocarbons, aromatic hydrocarbons and chlorinated hydrocarbons can soften and swell polypropylene, and its chemical invariance still advances with the increase of crystallinity. Therefore, polypropylene is suitable for building various chemical pipelines and accessories, anti-erosion end brilliant. Electrical properties it has a high dielectric coefficient and can be used to build heated electrical insulation products as temperature rises. Its breakdown voltage is also very high, and it is used as an electrical accessory. The resistance to voltage and arc is good, but the static electricity is high and the contact with copper is easy to age. Weather-resistant polypropylene is very sensitive to ultraviolet rays, and its aging resistance can be improved by intervening in zinc oxide, Zichun guester, carbon black or similar milky white filler. Hydrophobic parameters account for reference values (XlogP): 3. 32, the number of hydrogen bond donors: 03, the number of hydrogen bond receptors: 34, the number of convertible bonds: 15, the number of mutual isomer: 6, the topology molecular polarity profile product (TPSA): 29. 5 prevent strong oxidant, chlorine and potassium permanganate from being sealed and stored in a cool and dry place to ensure excellent ventilation.
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