Supply all kinds of PP sheet

Chemical name: polypropylene Features: density, strength stiffness, hardness and heat resistance are superior to low-pressure polyethylene, can be used at 100 degrees. Has good electrical properties and high-frequency insulation from humidity, but the low temperature brittle, do not wear, easy to aging · suitable for production of general machinery parts, corrosion-resistant parts and insulating parts 1 Process Editor Drying: If storage suitable drying process is not required. Melting temperature: 220 ~ 275C, careful not to exceed 275C. Mold temperature: 40 ~ 80C, recommend the use of 50C. The degree of crystallinity determined by the mold temperature. Injection pressure: can be as large as 1800bar. Injection speed: In general, the use of high-speed injection molding can make the internal pressure is reduced to a minimum. If the product surface defects, so you should use low-speed injection molding under high temperature. Runners and gates: for cold runner, the typical flow channel diameter is 4 ~ 7mm. We recommend using whole body is circular sprue and runner. All types of gate can be used. Typical gate diameter is 1 ~ 1.5mm, but can also be used as small as 0.7mm gate. For the edge of the gate, the minimum gate depth should be half the thickness; the smallest gate width should be at least twice the thickness. PP materials can use the hot runner system. Molding characteristics 1. crystalline material, moisture absorption, prone to melt fracture, long-term contact with the hot metal decomposition. 2. Liquidity is good, but the contraction range and large shrinkage, and prone to shrinkage, dents, deformation. 3. Cooling speed, gating system and cooling system should be slow to heat, and pay attention to controlling the molding temperature low temperature and high pressure feed easy orientation, the mold temperature is below 50 degrees, the plastic is not smooth, easy to produce poor welding, flow marks, 90 degrees prone to warpage. 4. Plastic wall thickness shall be uniform to avoid the lack of rubber, sharp corners to prevent stress concentration. 2 Performance Editing physical properties of polypropylene is non-toxic, odorless, tasteless milky white highly crystalline polymers, density of only 0. 90 -. "0 91g / rm, is one of the lightest of all plastic varieties it. particularly stable in water, water absorption in water is only 0. O1%, a molecular weight of about 8 150 000 in case. formability, but shrinkage (of 1% to 2.5%). walled products easy to depression, to Some dimensions of high precision parts, but also difficult to meet the requirements, the product surface gloss, easy coloring. high crystallinity [4] mechanical properties of polypropylene, regular structure, which has excellent mechanical properties. mechanical properties of polypropylene high absolute value polyethylene, but the plastic material is still at a low variety, its tensile strength up to 30 MPa or only slightly higher level of compliance and other large index polypropylene has a high tensile strength, but with the like improve regulation index, impact strength decreased, but dropped to a certain value does not change temperature and loading rate on a great impact toughness of polypropylene. When the temperature is higher than the glass transition temperature, impact damage showed toughness fracture, lower than the glass transition temperature of brittle fracture and impact strength values ??dropped significantly. improve loading speed, it can rise to the fracture toughness of brittle fracture transition temperature of polypropylene with excellent bending fatigue resistance, and its products at room temperature 106 can be bent without damage, but at room temperature and low temperature, high molecular structure structured itself so poor impact strength. The most outstanding performance is the bending fatigue resistance of polypropylene, commonly known as the pleated plastic thermal performance Polypropylene has good heat resistance, products can be sterilized at a temperature above 100 ℃, without being subject to external conditions, 150 ℃ not deformed. brittle transition temperature of -35 ℃, will be lower than -35 ℃ embrittlement occurs, cold resistance than polyethylene. For the reported value of the glass transition temperature of polypropylene have a 18qC, OqC, 5 ℃ and so on, and this is because people use different samples, which contained crystal phase and amorphous phase in different proportions, None of the molecule chains due to different parts of the chain length of amorphous polypropylene polyethylene melting temperature higher than about 40 to 50%, about 164 a 170 ℃, 100% isotacticity polypropylene melting point of 176 ℃. Chemical stability chemical stability of polypropylene well, in addition to be concentrated sulfuric acid, concentrated nitric acid erosion, but for a variety of other chemical reagents are relatively stable; but the low molecular weight aliphatic hydrocarbons, aromatic hydrocarbons and chlorinated hydrocarbons soften and make polypropylene swelling, and it also improved chemical stability with increasing degree of crystallinity, so suitable for the production of various chemical polypropylene pipes and fittings, anti-corrosion effect good electrical properties it has higher dielectric constant with temperature rise, can be used to make heating of electrical insulation products. It is also high breakdown voltage, suitable for electrical accessories. Anti-voltage arc resistance, static high and easy to aging in contact with the copper. weathering resistance poly acrylic UV-sensitive by adding zinc oxide, thiodipropionate February Gui ester, carbon black or similar creamy white fillers such as to improve its anti-aging properties, hydrophobic parameter for calculating the reference value (XlogP):. 3.32, the number of hydrogen bond donor : 03, the number of hydrogen bond acceptor: 34, rotatable bond: 15, the number of tautomers: 6, topological molecular polar surface area (TPSA): 29.5 Avoid strong oxidizing agents, chlorine, potassium permanganate closed, cool dry place to ensure that there is good ventilation [1]. 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