Oily carbon nanotube conductive slurry moisture testing device and testing method

Abstract

The present invention belongs to the technical field of moisture testing of oily carbon nanotube conductive slurry, and particularly relates to a moisture testing device and method for oily carbon nanotube conductive slurry. The testing method comprises: removing the injection needle of the syringe, opening the bottle cap of the sample bottle storing the carbon nanotube conductive slurry sample, injecting the sample in the sample bottle with a syringe, sleeve a needle filter on the head of the syringe, and sleeve the injection needle on the needle filter; squeezing the syringe to discharge gas and part of the sample, and plugging the injection needle with a sealing sheet; placing the syringe on a zeroed electronic balance, removing the syringe, and injecting the sample into a coulometric moisture meter; then placing the syringe back on the electronic balance, the weight displayed on the electronic balance is the weight of the sample, and the weight is input into the coulometric moisture meter, and after the coulometric moisture meter is tested, the result displayed on the coulometric moisture meter is the moisture content of the carbon nanotube conductive slurry. The testing method can improve the sample testing efficiency and the result accuracy.

Description

Technical Field

[0001] The invention belongs to the technical field of moisture testing of oily carbon nanotube conductive slurry, and in particular relates to a moisture testing device and a testing method for oily carbon nanotube conductive slurry. Background Art

[0002] The demand for carbon nanotube conductive slurry as a conductive agent for power batteries is increasing rapidly. Improving production efficiency and process inspection efficiency is conducive to increasing product capacity. Therefore, online monitoring, rapid and accurate testing of the moisture content of carbon nanotube conductive slurry is particularly important.

[0003] At present, the industry mainly tests the moisture content of carbon nanotube conductive paste by diluting it before testing; there are at least the following problems with the test: 1) The test environment requirements are harsh (humidity ≤ 30RH%); 2) The test cycle is long (it takes about 2.5 hours to test a moisture content); 3) The test results are easily affected by the environment and the operation is cumbersome. Summary of the invention

[0004] The purpose of the present invention is to provide a device and method for testing the moisture content of an oily carbon nanotube conductive paste, aiming to solve the technical problems of low test accuracy and low efficiency in the prior art for testing the moisture content of a carbon nanotube conductive paste.

[0005] To achieve the above purpose, an embodiment of the present invention provides a method for testing the moisture content of an oily carbon nanotube conductive slurry, comprising the following steps:

[0006] S100: Pushing away the injection needle of the syringe, opening the cap of the sample bottle storing the carbon nanotube conductive slurry sample, drawing 3 ml to 5 ml of the sample into the sample bottle with the syringe, and setting a needle filter on the head of the syringe, and then setting the injection needle on the needle filter;

[0007] S200: squeezing the syringe, and discharging the gas in the needle filter and part of the sample at the injection needle, and then plugging the injection needle with a sealing sheet to seal the injection needle;

[0008] S300: placing the sealed syringe on an electronic balance, setting the electronic balance to zero, removing the syringe, and injecting the sample into a coulometric moisture meter;

[0009] S400: Place the syringe back on the electronic balance. The weight displayed on the electronic balance is the weight of the sample. Enter the weight into the coulometric moisture meter. After the coulometric moisture meter finishes testing, the result displayed on the coulometric moisture meter is the moisture content of the carbon nanotube conductive paste.

[0010] Furthermore, in the step S100, the syringe is used to absorb the sample from the liquid surface below the depth of 5 cm in the sample bottle.

[0011] Furthermore, in the step S100, after the syringe absorbs the sample in the sample bottle, the sample on the outer surface of the syringe is wiped clean, and then the needle filter is mounted on the head of the syringe.

[0012] Furthermore, in the step S100, before the needle filter is mounted on the head of the syringe, the needle filter is first placed in a forced air drying oven for baking.

[0013] Furthermore, in the step S100, the needle filter is placed in the air drying oven at a temperature range of 55°C to 65°C for baking.

[0014] Furthermore, in the step S100, the needle filter is baked in the air drying oven for more than 2 hours.

[0015] Furthermore, in the step S300, 0.1 g to 0.5 g of the sample is injected into the coulometric titrator.

[0016] Furthermore, the steps S100 to S400 are all performed in an environment of normal temperature and normal humidity.

[0017] The above one or more technical schemes in the moisture testing method of oily carbon nanotube conductive slurry provided by the embodiment of the present invention have at least one of the following technical effects: in the testing method of the present invention, the oily carbon nanotube conductive slurry sample is sucked into the syringe with the cooperation of a syringe, a needle filter, a sealing sheet, an electronic balance and a coulometric moisture meter, and then the material sample is filtered through a needle filter to achieve solid-liquid separation. By testing the separated liquid moisture, the slurry moisture can be quickly and accurately obtained; the testing method is easy, simple, fast and accurate to operate, can effectively reduce the impact of the environment on the test results, and improve the sample testing efficiency and the result accuracy.

[0018] Another embodiment of the present invention provides a moisture testing device for oily carbon nanotube conductive slurry, comprising:

[0019] A syringe, used for drawing a sample of carbon nanotube conductive slurry;

[0020] A needle filter, used to be connected to the syringe to filter the carbon nanotube conductive slurry sample injected by the syringe;

[0021] A sealing sheet, used for sealing the injection needle of the syringe;

[0022] An electronic balance, used for weighing a syringe containing the carbon nanotube conductive slurry sample;

[0023] The coulometric moisture meter is used to measure the moisture data of the carbon nanotube conductive slurry sample injected therein.

[0024] Furthermore, the oily carbon nanotube conductive slurry moisture testing device also includes an air blast drying oven, and the air blast drying oven is used to dry the needle filter.

[0025] The above one or more technical solutions in the oily carbon nanotube conductive slurry moisture testing device provided by the embodiment of the present invention have at least one of the following technical effects: in the testing device of the present invention, the oily carbon nanotube conductive slurry sample is sucked into the syringe with the cooperation of the syringe, needle filter, sealing sheet, electronic balance and coulometric moisture meter, and then the material sample is filtered through the needle filter to achieve solid-liquid separation. By testing the separated liquid moisture, the slurry moisture can be quickly and accurately obtained; the testing method is easy, simple, fast and accurate to operate, which can effectively reduce the impact of the environment on the test results and improve the sample testing efficiency and the result accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0027] Figure 1 The present invention provides a flow chart of a method for testing moisture in oily carbon nanotube conductive slurry according to an embodiment of the present invention.

[0028] Figure 2 A schematic diagram of the structure of a moisture testing device for oily carbon nanotube conductive slurry provided by an embodiment of the present invention.

[0029] Among them, the reference numerals in the figure are:

[0030] 10—Syringe 11—Injection body 12—Injection needle

[0031] 20 - needle filter 21 - filter body 22 - sleeve

[0032] 23 - insert tube 30 - seal sheet 111 - tube body

[0033] 112—Piston operating rod 1111—Head. DETAILED DESCRIPTION

[0034] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the embodiments of the present invention, and should not be construed as limiting the present invention.

[0035] In the description of the embodiments of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0036] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0037] In the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0038] In one embodiment of the present invention, Figures 1-2 As shown, a method for testing the moisture content of an oily carbon nanotube conductive slurry is provided, comprising the following steps:

[0039] S100: Push aside the injection needle 12 of the syringe 10, open the bottle cap of the sample bottle storing the carbon nanotube conductive paste sample, use the syringe 10 to draw 3ml to 5ml of the sample in the sample bottle, and set a needle filter 20 on the head 1111 of the syringe 10, the needle filter 20 is used to filter the carbon nanotube conductive paste in the sample, and then set the injection needle 12 on the needle filter 20;

[0040] S200: squeezing the syringe 10, and discharging the gas and part of the sample in the needle filter 20 at the injection needle 12, and then plugging the injection needle 12 with a sealing sheet 30 to seal the injection needle 12;

[0041] S300: placing the sealed syringe 10 on an electronic balance, setting the electronic balance to zero, removing the syringe 10, and injecting the sample into the coulometric moisture meter;

[0042] S400: Place the syringe 10 back on the electronic balance. The weight displayed on the electronic balance is the weight of the sample. Input the weight into the coulometric moisture meter. After the coulometric moisture meter finishes testing, the result displayed on the coulometric moisture meter is the moisture content of the carbon nanotube conductive paste.

[0043] In the moisture testing method of oily carbon nanotube conductive slurry of the present invention, after the oily carbon nanotube conductive slurry sample is sucked into the syringe 10 with the cooperation of the syringe 10, the needle filter 20, the sealing sheet 30, the electronic balance and the coulometric moisture meter, the material sample is filtered through the needle filter 20 to achieve solid-liquid separation, and the moisture content of the slurry can be quickly and accurately obtained by testing the separated liquid moisture; the testing method is convenient, simple, fast and accurate to operate, can effectively reduce the influence of the environment on the test results, and improve the sample testing efficiency and the result accuracy.

[0044] Furthermore, in step S100, the syringe 10 is used to absorb the sample at a liquid surface below a depth of 5 cm in the sample bottle. Specifically, extending the head 1111 of the syringe 10 below a depth of 5 cm in the sample bottle can ensure that the sampled sample is representative, and avoid using the sample near the top of the liquid surface that is infiltrated by moisture in the air as a representative sample. For example, the head 1111 of the syringe 10 can be extended to a depth of 5 cm, 6 cm, 7 cm, etc. of the liquid surface.

[0045] Furthermore, in the step S100, after the syringe 10 absorbs the sample in the sample bottle, the sample on the outer surface of the syringe 10 is wiped clean, and then the needle filter 20 is mounted on the head 1111 of the syringe 10. Specifically, through this operation step, it is possible to prevent the sample attached to the outer surface of the syringe 10 from affecting the installation of the needle filter 20 and affecting the weighing quality of the entire syringe 10, thereby improving the accuracy of the test.

[0046] Furthermore, in the step S100, the needle filter 20 is placed in a blast drying oven for baking before the needle filter 20 is sleeved on the head 1111 of the syringe 10. Specifically, after the baking and drying step, the moisture on the needle filter 20 can be evaporated to avoid affecting the subsequent moisture test of the sample.

[0047] Furthermore, in the step S100, the needle filter 20 is placed in the air drying oven at a temperature range of 55°C to 65°C for baking. Specifically, the baking temperature of 55°C to 65°C will not damage the needle dryer, and has a sufficient temperature to dry the moisture attached to the needle dryer. For example, the baking temperature can be 55°C, 56°C, 57°C, 58°C, 59°C, 60°C, 61°C, 62°C, 63°C, 64°C or 65°C.

[0048] Furthermore, in the step S100, the needle filter 20 is baked in the air drying oven for more than 2 hours. By baking and drying for more than two hours, the moisture on the needle filter 20 can be completely evaporated, further ensuring the accuracy of the subsequent moisture test of the sample.

[0049] Furthermore, in step S300, 0.1 g to 0.5 g of sample is injected into the coulometric moisture meter. Specifically, according to the preliminary moisture data of the sample, 0.1 g to 0.5 g of sample can be selected to be injected to test the real moisture data of the sample, and the amount of sample injected into the coulometric moisture meter can be 0.1 g, 0.2 g, 0.3 g, 0.4 g or 0.5 g.

[0050] Furthermore, the steps S100 to S400 are all performed under normal temperature and humidity. The test method of the present invention can be performed under normal temperature and humidity, which reduces the requirements for the test environment and improves the convenience of the test.

[0051] like Figure 2As shown, another embodiment of the present invention provides a moisture testing device for oily carbon nanotube conductive paste, comprising a syringe 10, a needle filter 20, a sealing sheet 30, an electronic balance and a coulometric moisture meter. The syringe 10 is used to absorb the carbon nanotube conductive paste sample; the needle filter 20 is used to connect with the syringe 10 to filter the carbon nanotube conductive paste sample injected by the syringe 10; the sealing sheet 30 is used to seal the injection needle 12 of the syringe 10; the electronic balance is used to weigh the syringe 10 that absorbs the carbon nanotube conductive paste sample; and the coulometric moisture meter is used to measure the moisture data of the carbon nanotube conductive paste sample injected therein. In the oily carbon nanotube conductive slurry moisture testing device of the present invention, after the oily carbon nanotube conductive slurry sample is sucked into the syringe 10 with the cooperation of the syringe 10, the needle filter 20, the sealing sheet 30, the electronic balance and the coulometric moisture meter, the material sample is filtered through the needle filter 20 to achieve solid-liquid separation, and the slurry moisture content can be quickly and accurately obtained by testing the separated liquid moisture; the testing method is convenient, simple, fast and accurate to operate, can effectively reduce the influence of the environment on the test results, and improve the sample testing efficiency and the result accuracy.

[0052] Furthermore, the oily carbon nanotube conductive slurry moisture testing device also includes a blast drying oven, which is used to dry the needle filter 20. Specifically, the blast drying oven can be used to perform a baking and drying step on the needle filter 20, so that the moisture on the needle filter 20 can be evaporated to avoid affecting the subsequent moisture test of the sample.

[0053] In this embodiment, Figure 2 As shown, the syringe 10 includes an injection body 11 and an injection needle 12. The injection body 11 includes a tube 111 and a piston operating rod 112. The piston operating rod 112 extends into the tube 111 at one end of the tube 111 and slidably cooperates with the tube 111. The other end of the tube 111 is provided with the head 1111. The injection needle 12 is detachably connected to the head 1111. By pushing and pulling the piston operating rod 112 relative to the tube 111, the sample can be sucked into the tube 111 from the head 1111 or injected from the tube 111 to the head 1111, which is easy to operate.

[0054] In this embodiment, the tube body 111 is a transparent tube body 111, and a scale is provided on the outer surface of the tube body 111. In this way, the milliliter volume of the extracted sample can be obtained by observing the scale, and the sample volume can be quickly known.

[0055] In this embodiment, Figure 2As shown, the needle filter 20 includes a filter body 21 and a sleeve 22 and a cannula 23 respectively arranged at opposite ends of the filter body 21, the sleeve 22 is used to be sleeved outside the head 1111, and the cannula 23 is used to be inserted into the injection needle 12. The sleeve 22 and the cannula 23 are respectively used to connect with the head 1111 of the tube body 111 and the injection needle 12, and the detachable connection is realized by plugging and sleeve connection, which is very convenient to use.

[0056] In this embodiment, Figure 2 As shown, the filter body 21, the sleeve 22 and the cannula 23 are integrally formed to form the needle filter 20. The integrally formed manufacturing is beneficial to production and product consistency.

[0057] Preferably, the sealing sheet 30 is a silicone sheet, which can be used repeatedly and has a good sealing effect.

[0058] The following is a comparison of two conventional methods with the method of the present embodiment:

[0059]

[0060] From the above comparison, it can be seen that the testing method of this embodiment can more effectively reduce the impact of the environment on the test results, and improve the sample testing efficiency and the result accuracy.

[0061] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for testing the moisture content of oily carbon nanotube conductive slurry, characterized in that: The following steps are involved: S100: Pull out the injection needle of the syringe, open the cap of the sample bottle storing the carbon nanotube conductive slurry sample, use the syringe to draw 3ml~5ml of the sample in the sample bottle, and put a needle filter on the head of the syringe, and then put the injection needle on the needle filter; S200: squeezing the syringe, and discharging the gas in the needle filter and part of the sample at the injection needle, and then plugging the injection needle with a sealing sheet to seal the injection needle; S300: placing the sealed syringe on an electronic balance, setting the electronic balance to zero, removing the syringe, and injecting the sample into a coulometric moisture meter; S400: placing the syringe back on the electronic balance, the weight displayed on the electronic balance is the weight of the sample, and the weight is input into the coulometric moisture meter. After the coulometric moisture meter finishes testing, the result displayed on the coulometric moisture meter is the moisture content of the carbon nanotube conductive paste; In the step S100, the syringe is used to draw the sample from the liquid surface below the depth of 5 cm in the sample bottle; In the step S100, after the syringe absorbs the sample in the sample bottle, the sample on the outer surface of the syringe is wiped clean, and then the needle filter is placed on the head of the syringe; In the step S100, before the needle filter is mounted on the head of the syringe, the needle filter is first placed in a blast drying oven for baking; In the step S100, the needle filter is placed in the air drying oven at a temperature range of 55° C. to 65° C. for baking; In the step S100, the needle filter is baked in the air drying oven for more than 2 hours.

2. The method for testing moisture content of oily carbon nanotube conductive paste according to claim 1, characterized in that: In the step S300, 0.1 g to 0.5 g of sample is injected into the coulometric titrator.

3. The method for testing moisture content of oily carbon nanotube conductive paste according to any one of claims 1 to 2, characterized in that: The steps S100 to S400 are all performed under normal temperature and humidity conditions.

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