CN1026414C - Method for recovering polyimide film waste - Google Patents
Method for recovering polyimide film waste Download PDFInfo
- Publication number
- CN1026414C CN1026414C CN90102169A CN90102169A CN1026414C CN 1026414 C CN1026414 C CN 1026414C CN 90102169 A CN90102169 A CN 90102169A CN 90102169 A CN90102169 A CN 90102169A CN 1026414 C CN1026414 C CN 1026414C
- Authority
- CN
- China
- Prior art keywords
- polyimide film
- film waste
- waste
- resin solution
- polyimide
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/141—Feedstock
- Y02P20/143—Feedstock the feedstock being recycled material, e.g. plastics
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/62—Plastics recycling; Rubber recycling
Abstract
The present invention relates to a method for recovering polyimide film waste. The technique of the present invention comprises the steps that the polyimide film waste is alkalized firstly, and then the polyimide film waste is acidized; then, after the polyimide film waste is washed by water and dried, dried film is dissolved in a solvent to prepare a resin solution. The resin solution can be used for preparing insulating paints used in the industry of electric appliances, such as wire enamel, dip varnish, etc., or the resin solution can be used for preparing new polyimide film by film preparation and baking again. The method has a recovery rate higher than 95 percent, and the present invention has the advantages of simple technique, low cost, and no environment pollution.
Description
The invention belongs to the recovery method of polymer waste, particularly a kind of recovery method of polyimide film waste.
A kind of production treatment of polyimide waste working method is disclosed in the SU590317 patent document.This method is that reacting by heating in alkali lye filtered out diamines, with mother liquor reacting by heating in acid solution, filters out tetracarboxylic acid again, is reused for the material of manufacturing polyimide with the purified monomer that makes then after the scraped surface that contains polyimide was handled.Its weak point is that the process-cycle is long, and energy consumption is big, complex process; The rate of recovery is low, the cost height; Environmental pollution is arranged.
The objective of the invention is to overcome weak point of the prior art and a kind of recovery method of new polyimide film waste is provided.
Purpose of the present invention can reach by following measure:
It is that 5-50 ℃, concentration are in the alkali lye of 1.5N-10N 5-30 hour that polyimide film waste be impregnated in temperature, after the taking-up, impregnated in temperature 5-50 ℃, concentration again and be in the acid solution of 0.5N-5N 1-20 hour, take out washing, carry out vacuum-drying then, again that drying treatment is good film is dissolved in the solvent, just will be the resin solution that can make polyimide.
Used alkali lye is mineral alkali in above-mentioned alkalinisation treatment process, and as sodium hydroxide, potassium hydroxide, lithium hydroxide etc., used acid solution is a hydrochloric acid etc. in the acidification process.
The invention will be further described below in conjunction with embodiment:
Embodiment 1
With 4 gram thickness is that 0.03 millimeter polyimide film waste puts into that to fill temperature be that 15 ℃, concentration are 10N's, dipping took out after 20 hours in the beaker of 200 milliliters sodium hydroxide solution, putting into and filling temperature is that 12 ℃, concentration are the beaker dipping 18 hours of 200 milliliters the hydrochloric acid soln of 1.2N, wash after the taking-up, remove the acid solution on film surface, put into vacuum drying oven, at room temperature carry out vacuum-drying 30 hours, again dried film is dissolved in the intensive polar solvent of amides, just makes the resin solution that to make polyimide.
Embodiment 2
With 10 gram thickness is that 0.05 millimeter polyimide film waste puts that to fill temperature be that 22 ℃, concentration are in the beaker of 500 milliliters sodium hydroxide of 5.5N, flooded 11 hours, after the taking-up, putting into and filling temperature is that 21 ℃, concentration are the beaker dipping 5 hours of 500 milliliters the hydrochloric acid soln of 3N, wash after the taking-up, remove the acid solution on film surface, again its film was put into the vacuum drying oven inner drying 30 hours, dried film is fused in the intensive polar solvent of amides, just makes the resin solution that to make polyimide.
Embodiment 3
With 5 gram thickness is that 0.06 millimeter polyimide film waste puts into that to fill temperature be that 32 ℃, concentration are the beaker dipping 24 hours of 250 milliliters the sodium hydroxide solution of 2N, after the taking-up, putting into and filling temperature is that 38 ℃, concentration are the beaker dipping 1 hour of 250 milliliters the hydrochloric acid soln of 5N, wash after the taking-up, remove the acid solution on film surface, put into vacuum drying oven, at room temperature dry 30 hours, dried film is dissolved in the strong polar solvent of amides again, just makes the resin solution that to make polyimide.
Above-mentioned resin solution can be made into the insullac that electrical apparatus industries such as enameled wire, impregnating varnish are used, and also smear cures into new Kapton again.
The present invention compared with prior art has the following advantages: rate of recovery height (more than 95%), and cost recovery is low; Technology is simple, energy consumption is little; Cycle is short; Non-environmental-pollution.
Claims (2)
1, a kind of recovery method of polyimide film waste, operation is that polyimide film waste is carried out alkalinisation treatment, carry out acidification again, behind the film washing and drying of handling well, be dissolved in the solvent, thereby make the resin solution that to make polyimide, it is characterized in that: the alkalization of polyimide film waste and acidation treatment method are that waste material be impregnated in temperature is 5-50 ℃, concentration is in the alkali lye of 1.5N-10N 5-30 hour, after the taking-up, 5-30 hour, after the taking-up, in the acid solution that to impregnated in temperature again and be the 5-50 ℃ of degree of depth be 0.5N-5N 1-20 hour.
2, according to the said recovery method of claim 1, it is characterized in that: the used alkali lye of alkalinisation treatment is selected from sodium hydroxide, potassium hydroxide or lithium hydroxide, and the used acid solution of acidification is a hydrochloric acid.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN90102169A CN1026414C (en) | 1990-04-13 | 1990-04-13 | Method for recovering polyimide film waste |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN90102169A CN1026414C (en) | 1990-04-13 | 1990-04-13 | Method for recovering polyimide film waste |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1045800A CN1045800A (en) | 1990-10-03 |
| CN1026414C true CN1026414C (en) | 1994-11-02 |
Family
ID=4877396
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN90102169A Expired - Fee Related CN1026414C (en) | 1990-04-13 | 1990-04-13 | Method for recovering polyimide film waste |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1026414C (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104845526B (en) * | 2015-05-05 | 2017-03-22 | 重庆三峡油漆股份有限公司 | Recycling method of resin synthesis filter-pressing waste |
| CN105017560A (en) * | 2015-05-06 | 2015-11-04 | 无锡顺铉新材料有限公司 | Waste recovery processing method for modified polyimide precursor composition film |
| KR102529151B1 (en) * | 2016-01-27 | 2023-05-08 | 삼성전자주식회사 | Composition for preparing article including polyimide or poly(amide-imide) copolymer, article obtained therefrom, and display device including same |
| CN108359126A (en) * | 2018-03-29 | 2018-08-03 | 四川大学 | A kind of degumming recovery method of polyethylene terephthalate protective film waste material |
-
1990
- 1990-04-13 CN CN90102169A patent/CN1026414C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1045800A (en) | 1990-10-03 |
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| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C06 | Publication | ||
| PB01 | Publication | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |