According to the Science and Technology Daily, the team led by Associate Professor Wang Jian and the collaborators of the National Key Laboratory of Nuclear Detection and Nuclear Electronics of the Department of Physics of the University of Science and Technology of China, designed and tested several versions according to the characteristics of different infrared detectors. It solves the key technologies of weak signal detection, high gain sensitive amplification, undercurrent and background noise suppression. It first completes the J, H, K band near-infrared skylight background measuring instrument based on InSb detector, and completes the laboratory roof. test. Related results have been published in the internationally renowned magazine "Scientific Instrument Review". The development of infrared astronomical research in China is limited by the lack of excellent sites and detectors. With the continuous expansion of the field of astronomical research in China in recent years, the desire of the Chinese astronomical community to have infrared astronomical observation capabilities is also more urgent. In order to ensure the successful and efficient development of infrared observation instruments and infrared astronomical observations after the successful construction of these large-scale equipment, it is necessary to measure the infrared sky background of the relevant candidate sites. The background radiation intensity in the infrared range largely limits some important properties of infrared telescopes and other observing equipment, such as the depth of the survey, the limit stars that can be observed, and the exposure time of the astronomical imaging system. According to researchers, because InSb detectors require deep cooling, the power consumption and volume of the instrument are relatively large, which is very unfavorable for field observation. Based on the detection advantages of InGaAs detectors on the J, H, and K bands, it is based in 2017. The InGaAs detector completes the near-infrared skylight background measuring instrument for the South Pole, and conducted a test observation at the Ali Observatory in Tibet in July 2017. The first batch of Ali's near-infrared skylight background data was obtained, and the data showed that the summer Ali was near in the clear night. The intensity of the infrared skylight background is weak, and the stability of the equipment and the ability to monitor and operate for a long time are verified. On this basis, in 2018, it is aimed at the extremely low temperature, high altitude and low pressure of the Antarctic (the average temperature of the Kunlun station in the extreme night -60 ° C, the lowest temperature -86 ° C, the altitude is 4087 m, the air pressure is 0.5 atmosphere), and the power is difficult. In the extreme conditions, the optical, low-noise readout electronics, structure and electronic control, and automatic observation of the infrared skylight background measuring instrument were improved accordingly. In November 2018, the "Snow Dragon" scientific research ship went to the South Pole. It was installed and put into operation at the Kunlun Station in Antarctica on January 23, 2019.
PEI plastics (polyetherimide plastics) is an amber transparent solid. It has an inherent flame retardancy and low smoke concentration without adding any additives. The oxygen index is 47%, and the combustion level is ul94-v-0, and the density is 1.28~1.42 g/cm3.
PEI plastics has a strong thermal stability, and even the non-enhanced PEI plastics still has good toughness and strength.Therefore, the high thermal stability of PEI plasticsis used to make high temperature heat-resistant devices.
PEI plastics has excellent mechanical properties, electrical insulation performance, radiation resistance, high temperature resistance and abrasion resistance, and can be used by microwave.The PEI plastics also has good flame retardancy, chemical resistance and electrical insulation.Vitrification transformation temperature is very high, up to 215 ℃.PEI plastics also has a very low shrinkage rate and good mechanical properties.Adding fiberglass, carbon fiber or other fillings to enhance the purpose of modification;And other engineering plastics of heat-resistant polymer alloys, can be in 160 ~ 180 ℃ under the working temperature of use for a long time.
The long-term use of polyether amines in the us underwriters laboratory is 338T and 356T (according to the grade), and the combustion rating reaches UL94V - 0 (10 mille thickness).The oxygen index is 47, and the polyetherimide is in line with the requirements of the aircraft for the requirements of the FAA's flame retardant and thermal release material standards.It has a glass transition temperature of 419F and is allowed to be used intermittently under 392F, at higher temperatures, resulting in a short-term shift.Under 356T, the tensile temperature and flexural modulus were above 41 and 2068MPa respectively.The material reinforced with Glass Fiber and carbon fiber has higher strength and rigidity under the transition temperature of glass.
PEI plastics long-term resistance to creep under high temperature and stress allows it to replace metals and other materials in many structural devices.PEI plastics shows good performance in variable temperature, humidity and frequency.The low dissipation factor at GHz frequency makes the polyetherimide have high microwave wearability.Its ionic pollutant is low, at 250F100 % R.H.And 207kPa after 120 hours of water extraction with the conductivity, at 20 megaohm, it can be used as an electronic sensor element insulation.
PEI plastics is a fine coating and film forming material which can be used for the coating and film of electronic industry, and can be used in manufacturing aperture < 0.1 mu m, with high permeability microporous diaphragm.It can also be used as high temperature adhesive and high strength fiber.
Application field
Since PEI plastics has excellent comprehensive and balanced performance, PEI plastics has been applied to the departments of electronics, motor and aviation, and used as metal substitute materials for traditional products and cultural life supplies.Using PEI plastics instead of metal to make optical fiber connector, PEI plastics can optimize the structure of the component, simplify its manufacturing and assembly steps, and maintain a more precise size.Used in automobile industry, such as high temperature fittings for manufacturing, the high power lamp and light, control the car cabin outside temperature sensor (air conditioning temperature sensor) and the control of air and fuel mixture temperature sensor (effective combustion temperature sensor).Also can be used for high temperature erosion of lubricating oil vacuum pump impeller, distilling apparatus that operate at 180 ℃ of ground glass joints (following), the lighting of anti fog light reflector.
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