詳細(xì)內(nèi)容：PC 3025PG20』PC 3025PG20 PC 3025PG20』PC 3025PG20 PEI Plastic online plastic Encyclopedia 1. The main characteristics of PEI plastic online plastic Encyclopedia 1, PEI Chinese name (polyether imide) is amber transparent solid, good flame retardancy and low smoke, combustion grade of UL94-V-0 grade. Medium plastic online plastic Encyclopedia 2, PEI has strong high temperature stability, high temperature resistance, thermal deformation temperature of 220 degrees C, and can be used for a long time at working temperature of 180 C at -160. 3, the hydrolysis stability is very good, high temperature resistance, steam resistance; 4. Polyether imide has good anti ultraviolet and Y ray properties. Two, application Replacing metal with fiber optic connectors can optimize the structure of the component, simplify the manufacturing and assembly steps, and maintain a more accurate size. It is used in automotive field, such as sensors for manufacturing high-temperature connectors, producing high-power lights and indicators, controlling the external temperature of the cabin and controlling the mixture of air and fuel. It can also be used as a vacuum pump impeller with high temperature and lubrication and erosion, a grinding glass joint (Interface) and a non lighting antifogging reflector at a temperature of 180 degrees. application area After determining the total projection area (all the cavity plus the area of the injection pressure), we should provide 4 to 6 tons of clamping force for the projection area per square inch, so as to reduce the overflow of components. Glass reinforced resin may require a slightly higher clamping force (an estimate of one ton of clamping force per square inch). The thickness of the wall, the length of the flow and the injection conditions determine the actual tonnage of the clamping force. Barrel selection and screw design considerations: Plastic online plastic Encyclopedia When the PEI* resin is processed, the traditional manufacturing materials suitable for the compatible screw and cylinder of the day are usually used. It is recommended to use a bimetallic cylinder. According to the diameter of the screw, it is best to make the ratio of length to diameter 20:1, and the compression ratio of 2.2:1. In addition, it is suggested to use short feed zone (5 stage) and long compression zone (11 segments), and gradually transition to a shorter measurement area (4 segments) through a constant taper. Compression should be done at a constant taper of a gradual transition, as sharp changes may lead to excessive shear and material degradation. If a specific screw is not selected, it is successful to use a universal screw with a long diameter ratio of 16:1 to 24:1 and a compression rate of 1.5:1 to 3.0:1. It is recommended not to use a cylinder with a vent hole to process PEI* resin. The check valve should be a slip ring type. In a screw metering area, 80%. is usually at least the cross section of the flow area. PEI is amorphous, and has outstanding high temperature resistance, high strength, high modulus and wide chemical resistance. It has natural flammability, low smoke emission and high dielectric constant and dissipation factor. Commodity name: ULTEM: PEI plastic material in plastic online plastic Encyclopedia The United States GE 1000-1000/71011010-1000/7001, ATX2002100220 Product introduction: PBT The rheological property of PET is better in the melting state, and the effect of pressure on the viscosity is larger than that of the temperature. Therefore, the flow of the melt is changed mainly from the pressure. 1, the treatment of plastics is due to the PET macromolecule containing lipid base, which has a certain hydrophilicity. The pellets are sensitive to water at high temperature. When the moisture content exceeds the limit, the molecular weight of PET decreases, and the products are colored and crisp. Therefore, it is necessary to dry the material before processing, and the drying temperature is 150, 4 hours, generally 170, 3-4 hours. The air - ejection method is used to test whether the material is completely dry. Generally, the proportion of the recycled material should not exceed 25%, and the recycled material should be completely dried. 2, PET is chosen for injection molding machine. Because of its short time after melting point and high melting point, it is necessary to choose injection system with more temperature control section and less friction heat when plasticizing, and the actual weight of products (water cut material) should not be less than 2/3 of machine injection volume. Based on these requirements, in recent years, Ramada has developed a small and medium-sized series of PET special plasticizing systems. The clamping force is selected by more than 6300t/m2. 3, mold and gate design, PET bottle embryo is usually molded by hot runner mold. Between the mold and injection molding machine template, it is best to have insulation panels, the thickness is about 12mm, and the heat insulation board will be able to withstand high pressure. The exhaust must be sufficient to avoid partial overheating or fragmentation, but the depth of the exhaust port is generally not more than 0.03mm, otherwise it is easy to produce the fly edge. 4, the temperature of the melt glue can be measured by air ejection method. At 270-295 degrees C, the enhancement level GF-PET can be set to 290-315 degrees C. 5, the injection speed is fast, and it can prevent the early solidification of the injection. But too fast, the high shear rate makes the material fragile. The ejection is usually completed in 4 seconds. 6, the lower the back pressure, the better, so as to avoid wear. Generally not more than 100bar. It is usually not used. 7. Do not use too long detention time to prevent the decline of molecular weight. Try to avoid the temperature above 300 degrees centigrade. If the shutdown is less than 15 minutes. It is only required to do air - fire treatment; if more than 15 minutes, the viscosity PE should be cleaned and the barrel temperature is reduced to PE temperature until the machine is reopened. Recycling The recycling of German PET bottles to "Chinese sweaters" is also worth thinking, and there are about 8000000 PET bottles in the German market each year. The recycling company collected the bottles, crushed them into pieces or crushed them, and sold it to China at a relatively high price. According to the figures, a bottle of 16 liters of drink can be made into a sweater. Before 1993, all the plastic bottles were in the trash, a small part of the recycling. Since 4 years ago and the implementation of the tank fee, supermarket must recycle empty bottles, PET bottles, embarked on a journey to China, Wan Li: into synthetic crude wool sweater, and then returned to Germany, homecoming. China's textile industry has a huge demand for plastics. Although traders will add a bit more to the price of German recycling companies, imports are cheaper than their own raw materials. The transport from Hamburg to Hongkong was very low, because there were a lot of vacancies on the ship after the freighter came from China and unloaded the textile. The cost of production in China is very low, because the labor force is low, and the environmental and social standards are not perfect. In Chinese factories, these PET materials are classified according to color, cut into fragments and melted. After processing, PET bottles were returned to Germany in the form of textiles and sold in Germany. The value creation here is huge: a synthetic woolen sweater costs between 50 and 100 euros, and the material used is only 32 euro cents. The Far East can't see the end of the old plastic starvation. China has not been able to meet its needs with raw materials. In this context, second hand materials like PET are multiplied. Plastic empty bottles are used as raw materials in China, which shows that there is a world market of used raw materials in fact. 10 years ago, garbage was thrown into a garbage dump. "We were a consumer and discarding society." The example of China's processing Germany reselling illustrates the problem. "This market development shows to all consumers that some rubbish is indeed regenerated and reused." PMMA Acrylic with high transparency It can be preserved for a long time, never fade and use for 5~8 years. Durability: the product has good protection for the built-in light source, and prolongs the service life of the light source. Rationality: rational design, rain proof and moisture-proof, open structure, easy to repair. Impact resistance: 200 times the glass product, with almost no risk of breaking. Light: up to 93% excellent, soft light, dazzling light. Combustibility: it is difficult to burn and can continue to burn after fire. Beauty: exquisite craftsmanship, full font in mirror effect, no wrinkle, no seams, all riveting firmware is not exposed. Energy saving: the light transmittance is good, the light source products are reduced, electricity saving is saved, and the cost of use is reduced. shortcoming The shortcomings of PMMA are brittle and brittle, low surface hardness, easy to be scraped and lose luster, but fine scratches and scratches can be removed with polished paste. History Acrylic (ACRYLIC), name of special treatment of organic glass. The research and development of acrylic has a history of more than 100 years ago. In 1872 of the polymerization of acrylic acid was found in 1880; methacrylate polymerization known; synthesis of poly propylene ester propionic acid in 1901; in 1927 using the synthesis method to industrialized manufacturing; 1937 methyl acid industrial manufacture was developed successfully, which entered the scale of manufacturing. In the course of World War II, acrylic has excellent toughness and light transmittance. First, it is applied to the windshield of the aircraft, and the perimeter of the tank driver's cab. In 1948, the first acrylic bathtub was born in the world, and then the application of acrylic entered a new milestone. purpose 1. China's plexiglass and acrylic (acrylic) PMMA production and market situation. The total production capacity of China's plexiglass products is 130 thousand tons per day, and there are many manufacturers, but the scale of production is small. China's organic glass acrylic production and processing capacity is very large, but the product structure is not very reasonable, it can only produce ordinary variety products, lack of high value-added products needed by construction industry, and can not meet the market demand in variety and quality, for example, the demand for building is very high.