How to go about making polyimide film
Release Time：
2023-06-06
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How to go about mak跳畫ing polyimide film
Polyimide film is used 相爸almost exclusive黃海ly in the electrical industry,聽議 with a small amount use錢通d for non-electrica信年l applications in aviation, aeros商微pace, nuclear industry and 綠章bioengineering. 就市It is a film material上朋 with high tempe大時rature resistance中熱 (Class C or higher), deep cold res多日istance, high strength, high ch唱國emical resistance, non-flammable, n湖坐on-softening (thermosetting), radiat用校ion resistance and理個 superior performance. There has火看 been a rapid development in recent y分訊ears.
It can work at -269～+2理劇50℃ for a long time, and can also 司他be used at higher temperature身光s for a short time (s山電uch as 1 hour at 400℃).書著
Polymers with im朋明ine structure in the main chain房長 are collectively ca們雪lled polyimide PI,飛匠 but we are only talkin線喝g about polyimide f習文ilms synthesized f媽短rom homophthali煙票c dianhydride and 4,4′-diam醫劇inodiphenyl ethe短服r, which are widely u下頻sed.
The raw materials are mainly: 行如homophthalic dianh樹可ydride (PMDA) or 知你biphenyl tetracarboxylic dianhy木近dride (BPDA): (most o雪子f them are the fo行可rmer, the latter in 風現small quantitie跳照s, the domestic pr火頻oduction has not b技時een reported.)and 4,4′-diaminodipheny老習l ether (also known as diphenyl老理 ether diamine, or ODA).
The two raw mate從美rials (commonly known as t歌理he two monomers) are synthe車弟sized in a solvent as polyamido acid年著 resin. At present, the majority 劇近of polar solven就朋t dimethyl acetamide (DMAC) i地書s used as the s靜信olvent. The resin is defoamed, filtere生有d and pressurized under vacuum bef大去ore entering the film making 裡女process.
PI film compared 火間with BOPP, BOPET film p錢能roduction, the characteristics of 銀微the worthy of note in the patent ar北章e:
First, PI resin is a solution, no舞離t a melt like BOPP and BOPET.下作
Second, the resin is not ****** 請這polymer polyimide PI,事拿 but an intermediate prod年河uct polyamide a拍通cid. This leads to another important 來如feature - in addition to the廠術 general physical proc自用essing, the film 習好making process is accompanied by ch小得emical reactions from the生美 beginning to the end, 兒什i.e. "imidation" re關大actions. In addi人說tion to good film making technology,自坐 the film making雜飛 process also requires a str遠能ict "synchronization&qu相聽ot; of the two, so t她相hat no one can be ahead or behind.
Thirdly, the resin becomes fi相他lm not in the way of rapid厭空 cold casting, but in the way of evapor員鄉ating the solvent on the steel b看但elt under the hot air e多拿nvironment to become film.
Polyimide film production me子頻thod
This is a product知業ion method with much lower efficiency 通用than BOPP or BOPET rate (的學the general productio遠妹n line is 100-500 t間新ons/year), the reason is because河廠 PI has no softenin我資g point (thermosetting), and it can o讀什nly be processed be舊關fore PI is formed. At present,紙花 the domestic and foreign levels 現電can only use the abo個嗎ve process.
Here it is necessary to 新制mention in particul友從ar the process of "imidation"看雨 method. There are three ways of 金姐imidation, three different ways of好樂 imidation production line cost, pro校北duction efficiency 鄉關is completely different, the PI f靜是ilm performance, use is also compl對拍etely different:
1. Chemical imination, domestic is s街兵till in the research and development,近就 here omitted.
2. Air-roller heating, imidizing u議著nder small longitudinal tension. The 爸的film obtained in this way is comm員但only known as &qu吧我ot;salivating PI film". It has the厭師 characteristics of low cost an西樂d easy to grasp, and is討劇 produced in large quantitie火如s and used widely in 能年China, mainly for general insulat頻關ion.
3. Imidizing un雪少der the mechanical condition of bia湖業xial stretching 相數is called "金和;biaxial stretching 服了PI film". Bi-direction是明al stretch PI film is costly and techni河體cally difficult, and t樹和he process and equip頻金ment have higher requirements,門熱 and the overal街醫l performance of the pr報月oduct is also better than tha術近t of the "flow saliva f學上ilm". At present, it is mainly use鐵報d as a substrate for flexible prin你快ted circuit boards.
It is worth mentioning here that the au影我thor believes that the &qu鐘能ot;biaxial stretch" state i兒靜s only an important way of im聽男idization. It is not exac技錯tly the same as暗快 the process of molecular aggregatio放木n (longitudinal or crystalline) durin坐東g biaxial stretching of BO理大PP or BOPET, but has i知國ts own molecular microsco筆紙pic behavior, and the stretching is ac慢體companied by chemical reactions un相有til the winding. Moreover, the film o鐵文btained is not the same as the biaxial還時ly oriented BO-(喝話Biaxially Oriente通白d-), so it is not i老歌nappropriate to cal員友l it "biaxially ori愛年ented film", but the pro什工duct is called "BOPI", whic也算h is at least theoreticall內要y very debatable. The term &qu我哥ot;BOPI" is at least t爸美heoretically debatabl場問e.
PI film production is the房小 same as other films關工 in that the quality 身文of the film depends on the compreh頻謝ensive guarantee of raw 相靜materials, technology, 答內operation techno可知logy, process conditions, pro外輛cess equipment (production制笑 line) and production environmen來文t, but differs in that it has differen也東t production and post-processing meth了舊ods, and at present, res也自in synthesis must刀吃 be carried out sim畫畫ultaneously with film pro電了duction, and film production must de件看al with the synchronous relationsh地舊ip between physical proces飛林sing and chemical reaction matc關黑hing.
In the steel belt salivation公做 machine, the production technology體睡 elements are:
--resin molecular weight and c做不omposition, guaranteed by the prev年不ious process.
--Resin flow visc日亮osity.
--The support o行空f the strip, the geometry of the dr城舊um and the speed of微習 operation.
--Hot air control (solvent vapor c月花ontent, temperature, air聽們 speed, uniformity, sta煙些bility, etc.).
--Design and manufacturin用什g level of salivation nozzle, adjustabi東話lity, installation method and precis司村ion, etc..
-- Strict control of re人爸maining solvent content (or strict喝亮 control and regulation of volatilizati湖短on amount).
--Surface of the steel strip an鐘又d the way of de-動錯filming.
The main elements of the新朋 subamination process ar草下e:
--level of equipment, acc錯服uracy of force field .
--The mastery of temperature and time *物個*****.
--Better balance betwee討有n theoretical endpoint 雨錯and actual production endpoint湖媽, which is crucial for product司房 quality impact.
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