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Solution casting method

A technology of film casting and solution, applied in the field of static closed solution film casting method, can solve the problems of film perforation, affecting the quality of finished film, failure of electrochemical devices, etc., and achieving the effect of high crystallinity

Inactive Publication Date: 2013-01-23
山西金能世纪科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the electric heating wire at the joint of the heating pipe is prone to rust and produces rust chips. When the insulation top cover is opened and closed, the rust chips are easy to fall into the casting film plate, forming rust spots in the film, and affecting the quality of the finished film.
The rust spots in the film are easy to corrode and fall off in the electrochemical device, causing the film to perforate and make the electrochemical device invalid

Method used

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Examples

Experimental program
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Embodiment 1

[0073] The present embodiment is that the perfluorinated ion exchange membrane of 40cm * 40cm * 0.0005cm is made, and this method comprises the following concrete steps:

[0074] 1) Add 3g of perfluorosulfonic acid ion exchange resin with an equivalent weight of EW=900g / eq and 300mL of dimethylformamide (boiling point 153°C) into a 0.5L closed reactor, heat and stir to dissolve, the dissolution temperature is 220°C, and the dissolution time is 4 hours , the perfluorosulfonic acid ion exchange resin was dissolved in dimethylformamide to prepare about 300mL of a casting solution with a concentration of 1%.

[0075] 2) Use float glass and glass glue to prepare a casting film disc 1 with area S=44cm×44cm, thickness 1cm, depth 0.5cm, edge width 2cm, and inner bottom area 40cm×40cm. figure 1 shown.

[0076] 3) A heating device 3 with an area of ​​A=54cm×54cm is centrally arranged on the heat preservation base plate 2 such as figure 2 As shown, the power density of the heating dev...

Embodiment 2

[0089] This embodiment is made of perfluorinated ion exchange membrane of 60cm * 60cm * 0.0075cm, and the method comprises the following specific steps:

[0090] 1) Add 90g of perfluorosulfonic acid ion exchange resin with equivalent weight EW=1000g / eq and 3L of dimethylformamide (boiling point 153°C) into a 5L closed reactor and heat and stir to dissolve. The dissolution temperature is 210°C and the dissolution time is 5 hours. The perfluorosulfonic acid ion exchange resin was dissolved in dimethylformamide to prepare about 3 L of casting solution with a concentration of 3%.

[0091] 2) Use float glass and glass glue to prepare an area S=64cm×64cm, a thickness of 1.5cm, a depth of 1cm, an edge width of 2cm, and an inner bottom area of ​​60cm×60cm. figure 1 shown.

[0092] 3) A heating device 3 with an area of ​​A=100cm×100cm is centrally arranged on the heat preservation base plate 2 such as figure 2 As shown, the power density of the heating device 3 is 0.3W / cm 2 , the h...

Embodiment 3

[0105] The present embodiment is made of perfluorinated ion exchange membrane of 100cm * 100cm * 0.025cm, and this method comprises the following specific steps:

[0106] 1) Add 1kg of perfluorosulfonic acid ion exchange resin with equivalent weight EW=1100g / eq and 20L dimethylformamide (boiling point 153°C) into a 30L closed reactor and heat and stir to dissolve. The dissolution temperature is 200°C and the dissolution time is 6 hours. The perfluorosulfonic acid ion exchange resin was dissolved in dimethylformamide to prepare about 20 L of a casting solution with a concentration of 5%.

[0107] 2) Use float glass and glass glue to prepare a casting film disc 1 with area S=107cm×107cm, thickness 2cm, depth 1.5cm, edge width 3.5cm, and inner bottom area 100cm×100cm. figure 1 shown.

[0108] 3) A heating device 3 with an area of ​​A=200cm×200cm is centrally arranged on the heat preservation base plate 2 such as figure 2 As shown, the power density of the heating device 3 is 0...

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Abstract

A solution casting method comprises the following steps of: dissolving a solute in a solvent to prepare a casting solution; preparing a casting plate by float glass; arranging a heating device on an insulation base plate; arranging a rack on the periphery of the heating device and putting the casting plate on the rack; arranging a cooling water jacket on the insulation base plate, and letting the cooling water jacket encircle the heating device, the rack and the casting plate; arranging a condensed solvent collecting tank at the bottom of the cooling water jacket; pouring the casting solution into the casting plate; arranging an insulation top cover over the cooling water jacket, and sealing the internal space encircled by the cooling water jacket and the insulation base plate; starting the heating device to heat the casting solution so as to completely evaporate the solvent in the casting solution; continuously heating to further raise crystallization degree of a film; stopping heating, and peeling the film off from the casting plate; detecting the film thickness, adjusting the heating field, and raising thickness uniformity of the finished product film. The method provided by the invention has advantages of simple technology, cheap equipment and low film preparation cost. the finished product film has advantages of high degree of crystallization, isotropy, uniform thickness, few impurities, good appearance, high yield and the like.

Description

technical field [0001] The invention relates to a static closed solution casting film method. Background technique [0002] The existing film-making methods are usually dynamic and open stretching method, film extrusion method, and casting method, but there are complex processes, expensive equipment, high film-making costs, and defects such as low crystallinity and anisotropy in the finished film. [0003] For this reason, Chinese patent 200680044207.2 proposes a statically closed solution casting method, which basically overcomes the above-mentioned defects of the stretching method, extrusion method, and casting method. However, it is found in practice that the solution casting method also has the following deficiencies: [0004] 1. Since the far-infrared quartz heating tube is installed above the casting plate, the heating tube directly radiates and heats the casting liquid in the casting plate, so the casting liquid close to the heating tube (right below the heating tube...

Claims

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Application Information

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IPC IPC(8): C08J5/22
Inventor 郑重德
Owner 山西金能世纪科技有限公司
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