abbreviated as TPX, poly-4- methylpentene -1 monomer 4- methylpentene -1 natural color poly-4- methylpentene -1 is a highly crystalline transparent plastic with a specific gravity of .83, which is the lightest among all plastics. Low surface hardness, non-toxic. The light transmission performance is between plexiglass and polystyrene. Combustion characteristics can burn, and continue to burn slowly after leaving the fire, with melting and dripping. Advantages The light transmittance of TPX does not change with the change of processing conditions, nor does it change with the thickness of the product, so it is suitable for making transparent products. Its rigidity is great, exceeding that of polypropylene above 1℃; When the temperature is above 15℃, it will surpass the PC. Chinese name: TPX temperature: 16℃-18℃ pressure: 3-5kg/㎝2 preloading: 5-1sec. Introduction, characteristics, basic characteristics, application market, specific uses, processing technology, instructions for use, Brief introduction TPX is a polymer of 4- methylpentene-1 produced by Mitsui Chemical Co., Ltd., Japan. TPX is its trade name and its chemical name is Methyl pentene copolymer, abbreviated as PMP. Mitsui Chemical Co., Ltd. is the only manufacturer of TPX in the world. Density: .82-.83; Water absorption: .1%; Melting point: 24℃; Vicat softening temperature 16℃ ~ 17℃; Shrinkage rate: 1.5% ~ 3.%; Light transmittance: 9% ~ 92% (the only crystalline polymer in the commercialized high transparency resin); Characteristics (high temperature resistance, clarity and transparency, high melting point, chemical resistance, acid resistance, alcohol resistance and impact resistance): 1. Comparison at high temperature: quite high elongation at break, impact strength and excellent creep resistance (high rigidity); A, more than 1℃ over PP; B, 13℃ environment can be used for one year; C, more than 15℃ PC; D, 18℃ environment can be used for 1 hours. 1. Electrical insulation: (nonpolar group in TPX molecule) a. Dielectric strength: 65KV/mm (better than PTFE and propylene); B, dielectric constant: 2.12(PTFE dielectric constant is 2. ~ 2.1); 3. Chemical resistance: acid, alkali and edible oil; (Very low water absorption: very high tolerance to water and steam) 1. Hygienic safety: non-toxic and in line with the US FDA; The electrical insulation performance of TPX is better than that of polypropylene. Acid and alkali resistance, chemical corrosion resistance, organic solvent resistance, stress cracking resistance, and no tendency of stress cracking of other transparent materials under the action of detergent when used. TPX can be cooked and sterilized at 13℃ for 4 times without fogging, sterilized by hot air at 16℃ for 5 times in one hour, and sterilized at above 2℃. It can also be sterilized by ethylene oxide and radiation. Disadvantages: poor environmental resistance, easy oxidation, degradation by radiation after illumination, heating and yellowing. Suitable for transparent medical equipment, microwave tableware and ordinary tableware. TPX also has good fiberization and a wide source of raw materials, so some people call it "poor nylon". Injection characteristics TPX is a crystalline polymer with obvious melting point, which can be melted when heated to 235℃. When injection molding, the temperature is generally 26℃-3℃. TPX doesn't absorb water, so it generally doesn't need to be dried. Sometimes, for the sake of product quality, it can also be dried at 6℃ for 3 minutes to 1 hour to discharge the floating water in the raw materials. The shrinkage of TPX is 22 ‰; The basic characteristics of poly (4- methylpentene) The basic characteristics of poly (4- methylpentene) can be polymerized into poly (4- methylpentene) by using Ziegler-Natta catalyst such as TiCl3/AlCl3/Al(C2H5)2Cl system. Generally, the obtained poly (4- methylpentene) has a head-to-tail structure and is in the same row. Stereoregularity makes poly (4- methylpentene) have quite high crystallinity. Poly (4- methylpentene) has crystals consisting of helix formed by winding polymer chains, and every two turns of helix contain seven monomer units. The only stable crystal form is tetragonal, and each unit lattice contains four polymer chains and twenty-eight monomer units. The parameters of the lattice are a=18.6-18.7 A and b = 13.8a.. Theoretically, its crystal density is .812-.813 g/cm3, which can be said to be one of the lowest among polymers. The reason why the density of the crystalline part of poly (4- methylpentene) is so low is mainly due to the loose arrangement of polymer helices. At room temperature, the density of amorphous part of poly (4- methylpentene) is .838 g/cm3, while the density of crystalline part is about .813g/cm3, and the overall polymer density is about .83 g/cm3. The fact that this crystal has a lower density than the amorphous phase is similar to the characteristics of water (the density of frozen is lower than that of water). Poly (4- methylpentene) is also a semi-crystalline polymer, and the only polymer with higher average density than the crystalline part. The poly (4- methylpentene) resin that affects the commercialization of TPX is usually a * * * polymer of 4- methylpentene and several wt% α -olefin (such as hexene). Taking hexene as an example, the monomer unit of hexene is easy to replace the 4- methylpentene unit in the polymer helix in the * * * polymer without affecting the crystal structure and properties. Therefore, the crystallization properties of the * * polymer containing 5-1 mol% hexene, such as melting point and crystallinity, are somewhat similar to those of the poly (4- methylpentene) homopolymer, as shown in Table 1. The Tg of poly (4- methylpentene) homopolymer is about 5℃, while the Tg of some polymers drops to 2-3℃. Generally speaking, semi-crystalline polymers form opaque or translucent materials due to the difference in refractive index between crystalline and amorphous parts and the scattering of light by crystalline parts. However, poly (4- methylpentene) has quite high transparency, and the light transmittance can reach 9-92%, which is equivalent to amorphous polystyrene (PS) and polymethylmethacrylate (PMMA). The high transparency of poly (4- methylpentene) is mainly due to the low optical anisotropy of molecules in the helical configuration of crystalline phase and the close density and refractive index of crystalline part and amorphous part. The refractive index of the crystalline part is very close to that of the amorphous part, which makes the isotropy of the material high. Therefore, TPX has become the only crystalline polymer in the commercialized high transparency resin. High transparency, excellent heat resistance and low specific gravity are the most unique properties of TPX. At present, the annual consumption of TPX in the world is about 6T, mainly in Europe, America and Japan. Previously, the industry in Taiwan Province was not familiar with TPX materials, and the main reason for using TPX was usually designated by foreign manufacturers. Therefore, a few years ago, the consumption of TPX in Taiwan Province was not large, with an annual consumption of about 1T, and its use was limited to microwave tableware, transparent cosmetic containers and medical equipment. However, with the development of electronics industry in Taiwan Province, the consumption of TPX in Taiwan Province has greatly increased in recent years. TPX's release and temperature resistance make it an excellent mold material for epoxy tree limb packaging. In 2, Taiwan Province used about 9 hectares of TPX to manufacture LED packaging molds. In the electronic packaging industry, some heat-resistant release papers or films are often used. The release film made of TPX is favored because of its excellent temperature resistance. In 2, the industry in Taiwan Province used about 5 hectares of release film. In addition, the dielectric constant of TPX is very low, so some TPX are used to manufacture high-frequency connectors. Therefore, at present, the annual consumption of TPX in Taiwan Province is about 15 metric tons, and it is estimated that the consumption will continue to grow in the future. Specific uses 1. Beakers, Petri dishes and incubators (transparency, chemical resistance and water and gas permeability); 1. Cosmetic containers and bottle caps (essence) (which have no plastic smell and will not interfere with the original fragrance); [13] microwave lunch boxes, food containers (non-toxic, good temperature resistance, no microwave absorption); 2. Electronic and electrical parts, LED modules and covered cables (insulation, extrusion grade); ⒌ Medical instruments: speculum tube, syringe (sanitary); [6] oven appliances (high temperature); 1. Film processing technology (extrusion grade) 1. Injection molding technology: material temperature: 26℃ ~ 3℃; Mold temperature: 7℃; It is suggested that the screw length-diameter ratio of injection molding machine should be more than L/P=2. 1. Instructions for the use of blow molding 1. Name specification Product name: TPX release film packaging specification: carton packaging, 59mm×64mm×2pcs/ carton registered trademark 2. Product function; Protect FPC products from circuit breakage, wrinkle, stain, glue overflow, etc. in the manufacturing process. 3. Operation steps Cut the release film into required dimensions. Brush the FPC surface lightly with a brush (or suck it with a suction gun) to brush off dander or impurities. Stack and fix the release film according to the position and regulations of the work instruction and inspection standard card. Send the laminated semi-finished product to a hot pressing station for pressing. 4. Traditional pressing conditions: temperature. Pressure: 3Kg-4Kg; Time: 6 min. Quick pressing conditions:, forming pressure: 6~18sec, curing: 175℃/2hr. 5. Precautions for operation: TPX release film is often used for quick pressing. During operation, attention must be paid to the cleanliness of the interface between release film and FCCL. Work tools should not be placed on the product, otherwise it may cause scratches or crush injuries. 6. Raw material storage conditions: <; 25 ℃； Humidity: <; 65%; Storage time: 12 months. 7. Keep away from naked flames, handle with care.