Introduction and Characteristics of PI Film and Its Application in Flexible Circuit Board——Electromagnetic Heating Ro_Production Base of Electromagnetic Heating Roller (Electromagnetic Induction Heating Roller) - Hunan Qijixin Electronic Technology Co., Ltd.

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Introduction and Characteristics of PI Film and Its Application in Flexible Circuit Board——Electromagnetic Heating Ro

作者：管理员时间：2020-06-04 09:09 来源：未知浏览：次

Introduction of PI film
PolyimideFilm is the best performance film insulation material in the world. It is composed of PMDA and DDE in strong polar solvent by condensation and cocurrent ducting into film and then imide.

Polyimide film (PI film) properties

Yellow transparent, the relative density of 1.39~1.45, polyimide film has excellent high and low temperature resistance, electrical insulation, bonding, radiation resistance, dielectric resistance, can be used in the temperature range of -269℃~280℃ for a long time, short time can reach the high temperature of 400℃. The glass transition temperature was 280℃(Upilex R), 385℃(Kapton) and above 500℃ (Upilex S), respectively. The tensile strength is 200MPa at 20℃ and 100MPa at 200℃. Especially suitable for flexible printed circuit board substrate and various high temperature resistant electrical insulation materials.

Polyimide classification

Polyimides are generally classified into two major groups: thermoplastic polyimides, such as imide films, coatings, fibers, and polyimides for modern microelectronics. Thermosetting polyimides, mainly including bismaleimide (BMI) type and monomer reactant polymerization (PMR) type polyimides and their respective modification products. BMI is easy to process but brittle.

Polyimide film classification

It includes homobenzene polyimide film and biphenyl polyimide film. The former is the product of American dupont company, the trade name is Kapton, which is made from dpa and diphenyl ether diamine. The latter is produced by ube xingmei company in Japan under the trade name Upilex, which is made from diphenylethylenediamine (type R) and diphenylethylenediamine (type S).

Polyimide advantage

(1) excellent heat resistance. Polyimides are generally decomposed at temperatures in excess of 500 ° c and sometimes even higher, making them one of the most thermally stable organic polymers known, mainly because of the large number of aromatic rings in the molecular chains.

(2) excellent mechanical performance. The tensile strength of unreinforced matrix materials is above 100MPa. The tensile strength of Kapton films prepared with homogeneous anhydride was 170MPa, while that of biphenyl polyimide (Upilex S) was 400MPa. Polyimide fibers have an elastic modulus of 500MPa, second only to carbon fiber.

(3) good chemical stability and heat and humidity resistance. Polyimide materials are generally insoluble in organic solvents, resistant to corrosion and hydrolysis. Changing the molecular design can yield varieties with different structures. Some varieties can withstand 2 atmospheric pressure, 120℃,500h of water.

(4) good radiation resistance. The intensity of polyimide film remained 86% after 5×109rad radiation. The strength retention rate of some polyimide fibers by 1×1010rad fast electron radiation is 90%.

(5) good dielectric properties. Dielectric constant is less than 3.5, if the introduction of fluorine atoms on the molecular chain, dielectric constant can be to around 2.5, the dielectric loss of 10, dielectric strength between 100 and 300 kv/mm, volume resistance is 1015-17 Ω · cm. Therefore, the synthesis of fluorinated polyimide materials is a hot research field.

These properties are stable over a wide range of temperatures and frequencies. In addition, polyimide has the characteristics of low temperature resistance, low expansion coefficient, flame retardant and good biocompatibility. Polyimides can be widely used in many fields due to their excellent comprehensive properties and diversity in synthetic chemistry.

Electromagnetic heating roller (roller) electromagnetic induction heating production base - hunan JiJieXin electronic technology co., LTD. (www.zgqjkj.com/www.qjxdz.com) - electromagnetic heating roller industry for many years engaged in the development of research, successively presided over guangzhou, shenzhen, Shanghai, suzhou, shenyang, Taiwan, Japan and other regions and countries more than one project design and development, field installation and debugging, mastered all kinds of heating equipment application debugging work performance of electromagnetic heating roller, accumulated a lot of experience. Compared with the products of other companies, the electromagnetic heating roller produced by the company is more intelligent, safe, energy saving and environmental protection, with low maintenance cost, fewer faults and long service life.

Thanks to the efforts of technicians, our electromagnetic heating roller has successfully broken through the high temperature of 500℃, with its surface temperature uniformity of ±1℃ and temperature control accuracy of ±0.1℃, and its long-term stable and reliable performance, which can improve the output and quality of customers' products. The company has been adhering to the "product quality as the life of the enterprise, as the development of science and technology as the soul of the enterprise" purpose, adhere to become the leading force in the electromagnetic heating roller industry and struggle!

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