CN103217351B - A kind of measurement mechanism for imbibition capability of film object and measuring method thereof - Google Patents

Abstract

The invention discloses a measuring device and a measuring method for the liquid absorption capacity of thin film objects, including six parts: a balance, a sealed box, a liquid storage box, a valve, a vacuum pump, and a peripheral protection device. It utilizes the principle of liquid vaporization and adsorption The device for measuring the liquid absorption capacity of an object first reduces the pressure in the sealing body to vaporize the liquid, and the vaporized liquid is adsorbed on the thin film object to be tested, and then measures the liquid absorption capacity of the object through the change of the mass of the object before and after adsorption; this device effectively solves the problem of Conventional measurement devices have low precision and complicated procedures, which simplifies the operation of the measurement process and greatly reduces the errors introduced by conventional operations.

Description

A measuring device and measuring method for the liquid absorption capacity of thin film objects

technical field

The invention mainly relates to the technical field of material performance testing, in particular to a measuring device and a measuring method for the liquid absorption capacity of thin film objects.

Background technique

With the continuous advancement of science and technology, various new materials have emerged as the times require, and the understanding of different aspects of materials is becoming more and more perfect, which also puts forward higher requirements for measurement technology.

For the test of the liquid absorption capacity of the material, the conventional method is carried out by the method of soaking, that is, by measuring the quality difference of the object before and after being immersed in the liquid, but this method is more suitable for some powdery and bulk materials. Applicable, the error is small. However, for thin-film materials with a thickness of only a few millimeters or even a few microns, the error will be much larger, because such materials generally have a low density, and because of their small thickness, they are soaked in liquid and then taken out after absorbing liquid. The liquid storage time in the air is extremely short, and it is impossible to accurately obtain the mass after the liquid is absorbed instantly, resulting in a large measurement error.

Take the separator paper used in the field of lithium-ion battery manufacturing as an example. The liquid absorption capacity of the separator determines the quality of the battery, so it has always been a key indicator for the selection of lithium battery raw materials, but its thickness is generally only a dozen to dozens Using the conventional immersion method, the diaphragm after immersion is in the air, the liquid storage capacity is very poor, the electrolyte evaporates rapidly and dries up, and the quality after immersion cannot be accurately measured, resulting in inaccurate judgments.

Contents of the invention

The purpose of the present invention is to provide a device capable of accurately measuring the liquid absorption capacity of thin film objects in order to make up for the defects of the prior art.

The present invention is achieved through the following technical solutions:

A device for measuring the liquid absorption capacity of a thin film object, comprising a sealed box with a suspended balance installed on the top seal, the load hook of the balance hangs in the sealed box, and a loading barrel is hung on the hook, and the sealed box The bottom is closely attached to a liquid storage box, and the box body and the liquid storage box are connected through a valve. The middle and lower parts of the sealed box and the periphery of the liquid storage box are covered with a protection device. The protection device is made of thermal insulation material. One side of the sealing box is provided with a through hole, the through hole is connected with a pipeline, the other end of the pipeline is connected with a vacuum pump, the middle part of the pipeline is equipped with a valve two, and one side of the sealing box is installed with a valve three, and the three valves are close to the sealing A spray nozzle device can be installed on one side of the box.

Based on a device for measuring liquid absorption capacity of thin film objects, the measuring method specifically includes the following steps:

(1) Put the liquid to be tested into the liquid storage box and seal it, turn on the switch of the balance to level and reset it, take samples from the thin film object to be tested, put it in the loading bucket or hang it on the balance hook, close and seal the sealed box ;

(2) Close the valves 1 and 3 between the tank and the liquid storage box and on the sealing box, open the pipeline valve 2 connected to the vacuum pump, and turn on the vacuum pump. When the indication of the vacuum gauge on the vacuum pump reaches a certain value (according to the normal temperature of the liquid to be tested) Under the saturated vapor pressure decision), close the vacuum pump and the pipeline valve two connected to the vacuum pump;

(3) After the reading of the balance is stable, record the value m1 at this time as the mass before absorbing liquid;

(4) Open the valve 1 between the box and the liquid storage box, the liquid to be tested enters the sealed box in the form of spray, and is gradually adsorbed on the thin film object to be tested. After the balance shows stable, record the value m2 as the liquid absorption Quality, in this step, the peripheral protective device can play the role of heat preservation and collect the water formed by the liquefaction of water vapor outside the sealed box and the liquid storage box caused by the rapid heat absorption of the liquid in the liquid storage box;

(5) After the exhaust gas collection device is connected to the end of the empty pump, close the valve 1 between the tank and the liquid storage box, open the pipeline valve 2 and the vacuum pump connected to the vacuum pump to discharge the liquefied gas in the density tank, and then open the seal The valve three on the box is filled with air to complete the test operation process;

(6) Calculate the liquid absorption rate of the film liquid according to the measurement data m1 and m2.

This device is a device that uses the principle of liquid vaporization adsorption to measure the liquid absorption capacity of an object. First, the pressure in the sealed body is reduced to vaporize the liquid, and the vaporized liquid is adsorbed on the thin film object to be tested. Finally, the liquid absorption capacity of the object is measured by the change of the mass of the object before and after adsorption;

Described balance can be suspension type, or tray type and suspension type dual-purpose;

An exhaust gas collection device can be installed at the tail end of the vacuum pump;

The advantages of the present invention are:

The invention is simple in structure and easy to use. It changes the traditional method of immersing the object in the conventional gas, but puts the object in the saturated vapor of the adsorbed liquid after immersing the object, prolonging the liquid storage time of the film object after absorbing liquid. Then measure its mass after absorbing liquid. Using this device effectively solves the problems of low accuracy and cumbersome procedures of conventional measuring devices, simplifies the operation of the measurement process, and greatly reduces the errors introduced by conventional operations.

Description of drawings

Figure 1 is a schematic structural view of the present invention.

Detailed ways

As shown in Figure 1, a kind of device for measuring the liquid absorption capacity of thin film objects includes a sealed box body 2 with a suspended balance 1 installed on the top seal, the load hook 3 of the balance 1 is suspended in the sealed box, and the hook 3 A loading barrel 4 is hung, and the bottom of the sealed box 2 is closely attached to a liquid storage box 6, and the box body and the liquid storage box 6 are connected through a valve-8, and the middle and lower part of the sealed box 2 together with the liquid storage A protective device 5 is wrapped around the box, and the protective device 5 is made of thermal insulation material. One side of the sealed box is provided with a through hole connected to a pipeline, the other end of the pipeline is connected to a vacuum pump 7, and a valve 2 is installed in the middle of the pipeline. 9. A valve three 10 is installed on one side of the sealed box, and a spray nozzle device is installed near the side of the sealed box at the three valves.

The specific steps are as follows:

Step a, put the liquid to be tested into the liquid storage box 6 and seal it, turn on the switch of the balance 1 to level it and clear it, take samples from the thin film object to be tested, place it in the loading bucket 4 or hang it on the balance hook 3, and seal the box Body 2 is closed and sealed;

Step b, close valves 1, 3 8, 10, open valve 2 9, turn on vacuum pump 7, and when the indication of the vacuum gauge on vacuum pump 7 reaches a certain value (determined according to the saturated vapor pressure of the liquid to be measured at normal temperature), turn off the vacuum pump 7 and valve two 9;

Step c. After the reading of the balance 1 is stable, record the value m1 at this time as the mass before liquid absorption;

Step d, open the valve 18, the liquid to be tested enters the sealed box 2 in the form of a spray, and is gradually adsorbed on the thin film object to be tested. After the reading of the balance 1 is stable, record the value m2 as the mass after absorbing the liquid. This step Among them, the peripheral protection device 5 can play a role of heat preservation and collect the water formed by the liquefaction of the water vapor outside the sealed box 2 and the liquid storage box 6 due to the rapid heat absorption of the liquid in the liquid storage box 6;

Step e: After connecting the tail end of the vacuum pump to the exhaust gas collection device, close valve one 8, open valve two 9 and vacuum pump 7 to discharge the liquefied gas in the density box 2, and then open valve three 10 to fill in air to complete the test operation process;

Step f, calculating the liquid absorption rate of the film liquid according to the measurement data m1 and m2.

Claims (4)

1. A device for measuring the liquid absorption capacity of a film object, characterized in that: it comprises a sealed box with a top seal and a suspended balance, the loading hook of the balance is suspended in the sealed box, and the loading bucket is hung on the hook , the bottom of the sealed box is tightly attached to a liquid storage box, and the box and the liquid storage box are connected through a valve. The middle and lower parts of the sealed box and the periphery of the liquid storage box are covered with a protection device. Made of insulating material, one side of the sealed box is provided with a through hole, the through hole is connected to a pipeline, the other end of the pipeline is connected to a vacuum pump, the middle part of the pipeline is installed with a valve two, and one side of the sealed box is installed with a valve three. Install the spray nozzle device at three places of the valve close to the side of the sealed box. 2. A method for measuring liquid absorption capacity of thin film objects based on the device according to claim 1, characterized in that: comprising the following steps: (1) Put the liquid to be tested into the liquid storage box and seal it, turn on the switch of the balance to level and reset it, take samples from the thin film object to be tested, put it in the loading bucket or hang it on the balance hook, close and seal the sealed box ; (2) Close the valves 1 and 3 between the tank and the liquid storage box and on the sealing box, open the pipeline valve 2 connected to the vacuum pump, and turn on the vacuum pump. When the indication of the vacuum gauge on the vacuum pump reaches a certain value, turn off the vacuum pump and connect the vacuum pump The pipeline valve 2, the fixed value is determined by the saturated vapor pressure of the liquid to be measured at normal temperature; (3) After the reading of the balance is stable, record the value m1 at this time as the mass before absorbing liquid; (4) Open the valve 1 between the box and the liquid storage box, the liquid to be tested enters the sealed box in the form of spray, and is gradually adsorbed on the thin film object to be tested. After the balance shows stable, record the value m2 as the liquid absorption quality; (5) After the exhaust gas collection device is connected to the end of the vacuum pump, close the valve 1 between the tank and the liquid storage box, open the pipeline valve 2 and the vacuum pump connected to the vacuum pump, discharge the liquefied gas in the density tank, and then open the sealing box. Valve three is filled with air to complete the test operation process; (6) Calculate the liquid absorption rate of the film liquid according to the measurement data m1 and m2. 3. The device for measuring the liquid absorption capacity of thin film objects according to claim 1, characterized in that: the balance is a suspension type, or a tray type and a suspension type dual-purpose. 4 . The device for measuring the liquid absorption capacity of thin film objects according to claim 1 , wherein an exhaust gas collection device is installed at the tail end of the vacuum pump.