Polyimide Film has outstanding comprehensive properties such as good heat resistance, good dimensional stability, good mechanical properties, good dielectric properties, low moisture absorption, and low thermal expansion. It has been widely used in various traction motors, submersible motors, nuclear power equipment, and high temperature resistance Wire and cable, electromagnetic wire, special electrical appliances, anti-busbar slot, gas mask, high temperature resistant flexible printed circuit substrate, flat circuit and speaker voice coil skeleton are domestic die-cut polyimide films that do not warp.
Polyimide film, polyimide composite film (FH, FHF), polyimide adhesive film, polyimide glass varnished cloth, polyimide enameled wire lacquer, aromatic polyimide adhesive, Polyimide modified silicone pressure-sensitive adhesive tape, modified polyimide glass varnish (for voice coil), alcohol-soluble polyimide composite foil (for voice coil), polyimide corona-resistant film, poly Insulation materials such as imide fire mask and polyimide black film. Product applications have developed from motors and electrical appliances to the electronics industry, microelectronics industry, from civil industry to aviation, aerospace, nuclear industry and military industry
Basic introduction:
The preparation method of the film is: after the polyamic acid solution is cast into a film and stretched, it is imidized at high temperature. The film is yellow and transparent, the relative density is 1.39 ～ 1.45, has outstanding high temperature resistance, radiation resistance, chemical corrosion resistance and electrical insulation performance, and can be used in the air at 250 ～ 280 ℃ for a long time. The tensile strength is 200 MPa at 20 ° C and greater than 100 MPa at 200 ° C. It is especially suitable for flexible printed circuit board substrates and various high-temperature resistant motor and electrical insulation materials.
Physical properties
Thermosetting polyimide has excellent thermal stability, chemical resistance and mechanical properties, usually orange. The flexural strength of graphite or glass fiber reinforced polyimide can reach 345 MPa, and the flexural modulus can reach 20GPa. Thermosetting polyimide has little creep and has high tensile strength. The temperature range of polyimide covers a wide range, from minus one hundred degrees to two or three Baidu.
Chemical properties
Polyimide is chemically stable. Polyimide can prevent burning without adding flame retardant. General polyimides are resistant to chemical solvents such as hydrocarbons, esters, ethers, alcohols and chlorofluorocarbons. They are also resistant to weak acids but are not recommended for use in strong alkaline and inorganic acid environments. Some polyimides such as CP1 and CORIN XLS are soluble in solvents, and this property helps to develop their applications in spray coating and low temperature crosslinking.
Application
Film: Polyimide film is one of the earliest products of polyimide. It is used for slot insulation of motors and cable wrapping materials. The main products are DuPont Kapton, Upilex series produced by Ube and Zhongyuan Apical. The transparent polyimide film can be used as a flexible solar cell bottom plate. IKAROS sails are made of polyimide films and fibers. Polyimide fibers can be used for hot gas filtration, and polyimide yarns can separate dust and special chemicals from exhaust gas.
Fiber: The modulus of elasticity is second only to carbon fiber. It is used as a filter material and bulletproof and fireproof fabric for high temperature media and radioactive materials. Changchun, China has various polyimide products.
Foam plastic: Be used as high temperature resistant heat insulation material.
Engineering plastics: there are thermosets and thermoplastics. Thermoplastics can be compression molded, injection molded or transfer molded. Mainly used for self-lubricating, sealing, insulating and structural materials. Guangcheng polyimide material has begun to be applied to mechanical components such as compressor rotors, piston rings and special pump seals.
Separation membrane: used for separation of various gas pairs, such as hydrogen / nitrogen, nitrogen / oxygen, carbon dioxide / nitrogen or methane, etc., to remove water from air hydrocarbon feed gas and alcohols. It can also be used as pervaporation membrane and ultrafiltration membrane. Because of its heat resistance and resistance to organic solvents, polyimide is of particular importance in the separation of organic gases and liquids.
Components and semiconductors
Photoresist: Some polyimides can also be used as photoresists. There are negative glue and positive glue, and the resolution can reach submicron level. It can be used in color filter with pigment or dye, which can greatly simplify the processing procedure.
Application in microelectronic devices: used as a dielectric layer for interlayer insulation, as a buffer layer can reduce stress and improve yield. As a protective layer, it can reduce the impact of the environment on the device, and can also shield the a-particles, reducing or eliminating the soft error of the device (soft error). The semiconductor industry uses polyimide as a high-temperature adhesive. When producing digital semiconductor materials and MEMS system chips, the polyimide layer has good mechanical ductility and tensile strength, which helps to improve the polyimide layer. And the adhesion between the polyimide layer and the metal layer deposited above. The high temperature and chemical stability of polyimide play a role in isolating the metal layer from various external environments.
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