JPH0228435Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to an apparatus for measuring liquid permeability in a thin film.

Prior Art Conventionally, various devices for measuring the gas permeability of thin films have been devised and used in actual measurements, but no definitive device has been found for measuring the liquid permeability of thin films.

Purpose of the invention The present invention aims to provide an apparatus for effectively measuring liquid permeability in a thin film.

Structure of the invention The present invention is an apparatus that achieves the above purpose by arranging a pair of upper and lower chamber members having symmetrical opening edges facing each other, and pinching a thin film to be tested by the opening edges of both, and pressing the thin film under test against the upper and lower sides of the thin film. The first side is for storing or distributing a test liquid containing a permeable substance
A diffusion chamber is formed on the lower side, and a second diffusion chamber is formed on the lower side for circulating or circulating a blank liquid serving as a solvent for the permeable substance that has passed through the thin film, and a liquid inlet of the second diffusion chamber is formed. The liquid circulation channel connected to the outlet was provided with a sampling port for allowing insertion of a syringe needle, etc.

With the above configuration, when the blank liquid is collected from the sampling port after a certain period of time has passed after supplying and circulating the test liquid to the first diffusion chamber and the blank liquid to the second diffusion chamber, this liquid is the liquid of the test membrane. It contains a permeable substance that is transmitted according to the transmittance, and the transmittance can be easily measured by measuring this with an appropriate measuring device.

DESCRIPTION OF EMBODIMENTS In the figure, 1 is a measurement cell consisting of an upper block 1a and a lower block 1b, 2a and 2b are inlets and outlets for a permeable substance formed in the upper block 1a, and 3 is an upper block 1a and a lower block. 1b, a thin film as a sample piece inserted between
4 and 5 are first and second diffusion chambers formed between the thin film 3 and the upper block 1a and between the thin film 3 and the lower block 1b, respectively; 6 is the entrance of the second diffusion chamber 5 in the lower block; and an external flow path for circulation connected to the outlet; 6a and 6b are automatic on-off valves inserted into the flow paths; 7 is a blank liquid (or gas) inlet connected to the flow path 6 via the valve 6a;
Reference numeral 8 denotes a collection port in the channel 6 having a rubber plug or the like that allows insertion of a syringe needle, etc., 9 a pump, 10 a blank liquid (or gas) outlet connected to the channel 6 via a valve 6b, 11 is an autosampler capable of operating a sampling device such as a syringe 11a, and 12 is a permeated substance detection device.

In the above configuration, first, the sample piece 3 is set between the cell blocks 1a and 1b, and a liquid containing the permeable substance to be measured (0 to 100%) is injected from the injection port 2a, passes through the first diffusion chamber 4, and then flows through the discharge port 2b. Either it is discharged to a constant flow, or it is sealed in this diffusion chamber 4.

On the other hand, in the diffusion chamber 5 for the blank liquid separated from the sample piece 3, the blank liquid introduced into the flow path 6 from the blank liquid inlet 7 via the on-off valve 6a is circulated at a constant flow by the pump 9. However, if desired, the blank liquid may be discharged from the blank liquid inlet 7 through the flow path 6 including the valve 6a, the diffusion chamber 5, the sampling port 8, and the valve 6b through the blank liquid discharge port 10. It can also be a constant flow. In addition, as this blank liquid, one is selected that provides the optimum solvent for detecting the permeated substance.

The permeable substance in the liquid introduced into the first diffusion chamber 4 permeates the sample piece 3 over time, and the blank liquid in the second diffusion chamber 5 comes to have a constant concentration of the permeable substance. This blank liquid is collected from the collection port 8, preferably automatically or manually by an autosampler 11, and collected and measured via a collector 11a, and analyzed by a gas chromatograph, liquid chromatograph, or other permeated substance detection device 12. (quantified) to be done. This measured value is the permeate substance concentration in the blank liquid, and therefore corresponds to the liquid permeability of the sample thin film 3.

Note that blank gas is used instead of blank liquid (when using a gas chromatograph as an analyzer,
any carrier gas),
Alternatively, a gas containing a permeable substance may be used instead of the liquid introduced into the first diffusion chamber.

Effects of the Invention As described above, the present invention provides an apparatus for measuring liquid permeability in a thin film relatively easily and reliably.

[Brief explanation of the drawing]

The figure is a schematic cross-sectional view showing an embodiment of the present invention. 1...Measurement cell, 2a...Sample liquid inlet, 2b
...Sample liquid outlet, 3...Sample piece (thin film), 4,
5...Diffusion chamber, 6...Circulation channel, 6a, 6b...
...Opening/closing valve, 7...Blank liquid inlet, 8...Sampling port, 9...Pump, 10...Blank liquid outlet.

Claims (1)

[Scope of utility model registration request] A pair of upper and lower chamber members having symmetrically shaped opening edges are arranged facing each other, and a thin film to be tested is compressed by the opening edges of both, and a test liquid containing a permeable substance is stored or contained in the upper side of the thin membrane. A first diffusion chamber for circulation and a second diffusion chamber for circulation or circulation of a blank liquid serving as a solvent for the permeable substance that has passed through the thin film are formed on the lower side, respectively. A liquid permeability measuring device characterized in that a liquid circulation channel connected to a liquid inlet and an outlet of two diffusion chambers is provided with a sampling port into which a syringe needle or the like can be inserted.