Detection adhesive tape as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of secondary batteries, and particularly relates to a detection adhesive tape as well as a preparation method and application thereof. The detection adhesive tape provided by the invention comprises a substrate and a color developing part, and the color developing part is arranged on at least part of the surface of one side of the substrate; wherein the color developing part is prepared from the following components in percentage by mass based on the total mass of the color developing part: 0 to 65 percent of a first matrix, 20 to 92 percent of a second matrix, 0.02 to 0.8 percent of a color developing agent and 1 to 30 percent of water. According to the invention, the detection adhesive tape can be tightly attached to a to-be-detected position, and is suitable for liquid leakage detection of various types of batteries; by limiting the water content of the color developing part, a small amount of water in the color developing part can react with lithium salt (such as lithium hexafluorophosphate) in the electrolyte to generate hydrogen fluoride and phosphoric acid, both the two acids can provide a large amount of H < + >, the reaction with the structure of a color developing agent molecule is accelerated, and the color developing sensitivity of the color developing part is improved.

Description

Technical Field

[0001] The present application belongs to the technical field of secondary batteries, and specifically relates to a detection tape and a preparation method and application thereof. Background Art

[0002] At present, the main reasons why batteries need to be tested for leakage include the following: (1) Safety considerations: Battery leakage may cause the electrolyte to come into contact with the external environment, causing a chemical reaction, and may even cause a fire or explosion; (2) Anti-corrosion: The battery electrolyte may be corrosive, and leakage may cause corrosion to the battery casing, circuit boards or other electronic components, resulting in battery damage or performance degradation; (3) Maintenance costs: Leaking batteries need to be replaced or repaired in a timely manner, otherwise it may cause greater losses and increase maintenance costs. Therefore, battery manufacturers usually perform leakage detection during the production process and before battery shipment to ensure the safety and reliability of the battery.

[0003] The prior art discloses a method of detecting battery leakage using pH test paper, but the pH test paper in this method cannot fit the gap, such as the pole leakage points are mostly present at the corners, and the electrolyte leakage point detection is prone to deviation. The prior art also discloses the use of aluminum-plastic film containing acid-base color developers to detect battery leakage, but the aluminum-plastic film can only be applied to soft-pack battery core structures, and the current mainstream battery structure is square shell and cylindrical hard shell battery cores, so the application scope of this method is relatively limited. In addition, the above-mentioned detection method in the prior art, whether using pH test paper or acid-base color developers, requires a large area of ​​leakage to observe the color change, and has limited sensitivity to weak electrolyte leakage caused by abnormalities such as pole sealing interface and welding pinholes, and there are defects such as a certain lag between the electrolyte leakage time and the observation time. Summary of the invention

[0004] Therefore, the technical problem to be solved by the present application is to overcome the defects of the electrolyte leakage detection method in the prior art, such as limited sensitivity, hysteresis, and limited application scope, so as to provide a detection tape and its preparation method and application.

[0005] To this end, this application provides the following technical solutions:

[0006] According to one aspect of the present application, there is provided a detection tape, comprising a substrate and a color developing portion, wherein the color developing portion is disposed on at least a portion of a surface of one side of the substrate;

[0007] Wherein, based on the total mass of the color developing part, the components are included in the following mass percentages:

[0008] The first matrix: 0-65%, the second matrix: 20%-92%, the developer content: 0.02-0.8%, and the water content: 1%-30%.

[0009] In some optional embodiments, the first matrix includes at least one of silica gel and bentonite, and the second matrix includes at least one of starch, starch derivatives, cellulose derivatives, acrylic pressure-sensitive adhesives, polyvinyl pyrrolidone, polyethylene glycol, or polyvinyl alcohol;

[0010] Further optionally, the content of the first matrix is ​​20%-65%;

[0011] And / or, the content of the second matrix is ​​20%-40%.

[0012] In some optional embodiments, the particle size of the first matrix is ​​100-1000 μm, optionally 100-500 μm, further optionally 200-300 μm.

[0013] In some optional embodiments, it further comprises an adhesive layer, wherein the adhesive layer is disposed between the color developing part and the substrate;

[0014] Alternatively, the adhesive layer is disposed around the color development portion.

[0015] In some optional embodiments, the thickness of the color development portion is 0.5-3 mm; optionally 0.5-1.5 mm;

[0016] And / or, the water content of the color developing part is 5%-10%.

[0017] In some optional embodiments, the color developer includes methyl orange, methyl red, m-methyl red, phenol red, Congo red, naphthalene red, chlorophenol red, bromophenol red, cresol red, neutral red, fluorescent orange-red, acid interamine yellow, Dadan yellow, nitrate yellow, bromocresol purple, bromocresol green, bromochlorophenol blue, p-ethoxychrysanthemum orange, p-bromobenzenesulfonyl chloride, tetrabromophenol blue, resorcinol blue, phenolphthalein, o-cresolphthalein, o-cresolphthalein, tetrabromophenol sulfonephenolphthalein, m-cresol, litmus, litmus essence, bromothymol blue, thymol blue, benzoyl G, sodium p-nitrobenzene azo salicylate, sodium 4-nitrobenzene azo-1-naphthol-3,6-disulfonate; optionally, the color developer includes at least one of methyl orange, methyl red, m-methyl red, thymol blue, bromocresol green;

[0018] In the present application, a suitable developer can be selected within the above range according to the actual needs of the test. The above developers can be used alone or in combination, as long as the color development between the developers does not interfere with each other.

[0019] And / or, the adhesive layer includes at least one of an acrylic pressure-sensitive adhesive, a polyolefin pressure-sensitive adhesive, and a rubber pressure-sensitive adhesive;

[0020] And / or, the substrate is made of a transparent material, optionally one of polypropylene (PP), polyvinyl chloride (PVC), and polyethylene (PE).

[0021] According to another aspect of the present application, a method for preparing the above-mentioned detection tape is provided, comprising the following steps:

[0022] S1, mixing the components of the color development part, the organic solvent and water to obtain a premix;

[0023] S2, spreading the premix on at least a portion of the surface of one side of the substrate, and drying to obtain the detection tape.

[0024] In the present application, the components of the color development part include a first substrate, a second substrate, a color developer and water, and in some optional embodiments, a binder is also included.

[0025] In the present application, the organic solvent includes but is not limited to at least one of ethanol and methanol.

[0026] In some optional embodiments, the drying temperature is 40-60° C., and the drying is performed until the target moisture content is reached.

[0027] In some optional embodiments, the step of pre-preparing an adhesive layer on the surface of the substrate is also included;

[0028] Alternatively, in step S2, an adhesive layer is prepared around the dried premix.

[0029] In some optional embodiments, the preparation of the adhesive layer includes coating the corresponding adhesive material on the surface of the substrate or around the premix, and using a ceramic knife to scrape the glue flat.

[0030] In some optional implementations, a substrate having an adhesive layer may also be directly selected, for example, a transparent tape may be selected.

[0031] According to another aspect of the present application, there is also provided a use of the above-mentioned detection tape or the adhesive prepared by the above-mentioned preparation method in battery leakage detection.

[0032] In some optional embodiments, the specific application method includes: aligning the side of the detection tape provided with the color developing portion with the leakage position to be detected, and allowing the color developing portion to completely cover the leakage position to be detected, and pressing the color developing portion to make the color developing portion fit the leakage position to be detected.

[0033] The technical solution of this application has the following advantages:

[0034] The detection tape provided in the present application includes a substrate and a color developing part, wherein the color developing part is arranged on at least a part of the surface of one side of the substrate; wherein, based on the total mass of the color developing part, the following components are included in percentage by mass: first substrate: 0-65%, second substrate: 20%-92%, color developer: 0.02-0.8%, water 1%-30%. In the present application, the detection tape provided can be closely attached to the position to be detected by the coordination of each component and the adjustment of the dosage, and is suitable for leakage detection of various types of batteries; by limiting the water content of the color developing part, a small amount of water in the color developing part can react with the lithium salt (such as lithium hexafluorophosphate (LiPF6)) in the electrolyte to generate hydrogen fluoride (HF) and phosphoric acid (H3PO4), and both acids can provide a large amount of H + , accelerating the reaction with the structure of the developer molecules and improving the color sensitivity of the color developing part; but excessive water content is not conducive to the storage of the detection tape and the maintenance of the color development time.

[0035] The detection tape provided in the present application limits the types of the first substrate and the second substrate. The main function of the first substrate is to provide a rich microporous structure for the color-developing part, which is beneficial to enhancing the capillary absorption effect of the color-developing part, accelerating the diffusion of the electrolyte in the color-developing part, and increasing the reaction area between the electrolyte and the pH color developer, so that the color-developing part can more accurately react to the time and exact position of the leakage; the main function of the second substrate is to make the color-developing part easier to shape and ensure the effective contact and bonding between the color-developing substance and the substrate, so as to facilitate the diffusion of the electrolyte.

[0036] The detection tape provided in the present application limits the particle size range of the first substrate, and the preferred first substrate is 200-300 μm. During the experiment, the electrolyte diffuses faster in the microporous structure formed by the substrate in this range, and the color development is more sensitive.

[0037] The detection tape provided in the present application also includes an adhesive layer. When the adhesive layer is arranged between the color developing part and the substrate, the adhesion between the color developing part and the substrate can be further improved, thereby improving the fitting performance of the tape; when the adhesive layer is arranged around the color developing part, the usage of the color developing part can be reduced, thereby reducing costs.

[0038] The detection tape provided in the present application, the pH color developer can be a mixture of multiple color developers, and the mixed color developer can detect acidic and alkaline substances at the same time. When alkaline substances (blue) are detected, it can be considered that the sample to be tested or the detection tape is contaminated by foreign oil stains, and it should be investigated and dealt with in time. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the specific implementation methods of the present application or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0040] Figure 1 The embodiment 2 of the present application provides a diagram showing the effect of the test tape and the pole being fitted together;

[0041] Figure 2 This is a diagram showing the effect of the pH test paper and the pole being fitted together in the prior art. DETAILED DESCRIPTION

[0042] The following examples are provided for a better understanding of the present application, but are not limited to the best implementation mode described, and do not limit the content and protection scope of the present application. Any product identical or similar to the present application obtained by anyone under the inspiration of the present application or by combining the features of the present application with other prior arts shall fall within the protection scope of the present application.

[0043] If no specific experimental steps or conditions are specified in the examples, the conventional experimental steps or conditions described in the literature in the field can be used. If no manufacturer is specified for the reagents or instruments used, they are all conventional reagent products that can be obtained commercially.

[0044] Example 1

[0045] This embodiment provides a detection tape, and its composition and preparation method are as follows:

[0046] Step 1: 2 g of methyl red, 1 g of thymol blue, and 1 g of bromocresol green were dissolved in 1000 g of 95% ethanol aqueous solution to prepare a color developing solution;

[0047] Step 2: Mix 100 g of acrylic pressure-sensitive adhesive, 200 g of the color-developing solution obtained in step 1, and 20 g of deionized water to obtain a color-developing premix;

[0048] Step 3: The color development premix obtained in step 2 is evenly spread on a PET film substrate, and dried at 60° C. until the moisture content of the color development premix is ​​8.1%, thereby obtaining a detection tape with a color development portion thickness of 0.5 mm.

[0049] Example 2

[0050] This embodiment provides a detection tape, and its composition and preparation method are as follows:

[0051] Step 1: dissolve 1 g of methyl red in 1000 g of 95% ethanol aqueous solution to prepare a color developing solution;

[0052] Step 2: 400 g of bentonite (particle size 100-1000 μm), 200 g of starch, 500 g of the color development solution obtained in step 1, and 100 g of deionized water were mixed and stirred to obtain a color development premix;

[0053] Step 3: The color premix obtained in step 2 is evenly spread on the BOPP office tape (a substrate with an adhesive layer), and dried at 60°C until the moisture content of the color premix is ​​3.6%, to obtain a test tape with a color development part thickness of about 1 mm.

[0054] Figure 1 The effect diagram after the detection tape provided by this embodiment is attached is shown in FIG. Figure 2 The figure shows the effect of the bonding after the pH test paper is used for detection in the prior art. It can be seen from the figure that the detection tape provided in this embodiment can have a color-developing portion that fits tightly with the corner of the top cover pole (the object to be tested), which is convenient for timely and accurate detection of the leakage position. However, after the pH test paper is used for bonding, there is an obvious gap between the test paper and the pole of the object to be tested, which is not conducive to timely detection of the leakage position.

[0055] Example 3

[0056] This embodiment provides a detection tape, and its composition and preparation method are as follows:

[0057] Step 1: dissolve 1 g of methyl red in 1000 g of 95% ethanol aqueous solution to prepare a color developing solution;

[0058] Step 2: 400 g of bentonite (with the same particle size as in Example 2), 200 g of starch, 500 g of the color development solution obtained in step 1, and 100 g of deionized water were mixed and stirred to obtain a color development premix;

[0059] Step 3: The color premix obtained in step 2 is evenly spread on the BOPP office tape (a substrate with an adhesive layer), and dried at 60°C until the moisture content of the color premix is ​​12.5%, to obtain a test tape with a color development part thickness of about 1 mm.

[0060] Example 4

[0061] This embodiment provides a detection tape, and its composition and preparation method are as follows:

[0062] Step 1: dissolving 1 g of methyl red in 1000 g of a 30 wt % ethanol aqueous solution to prepare a color developing solution;

[0063] Step 2: 400 g of bentonite (with the same particle size as in Example 2), 200 g of starch, 200 g of the color development solution obtained in step 1, and 100 g of deionized water were mixed and stirred to obtain a color development premix;

[0064] Step 3: The color premix obtained in step 2 is evenly spread on the BOPP office tape (a substrate with an adhesive layer), and dried at 60°C until the moisture content of the color premix is ​​23.1%, to obtain a test tape with a color development part thickness of about 1 mm.

[0065] Example 5

[0066] This embodiment provides a detection tape, and its composition and preparation method are as follows:

[0067] Step 1: dissolving 1 g of methyl red in 1000 g of a 30 wt % ethanol aqueous solution to prepare a color developing solution;

[0068] Step 2: 400 g of bentonite (with the same particle size as in Example 2), 200 g of starch, 200 g of the color development solution obtained in step 1, and 100 g of deionized water were mixed and stirred to obtain a color development premix;

[0069] Step 3: Evenly spread the color premix obtained in step 2 on the middle position of the PET film (base without adhesive layer), dry it at 60°C until the moisture content of the color premix is ​​26.4%, and stick double-sided tape on the PET around the edge of the color premix to obtain a detection tape with a color development part thickness of about 1 mm.

[0070] Example 6

[0071] This embodiment provides a detection tape, and its composition and preparation method are as follows:

[0072] Step 1: 2 g of methyl red, 1 g of thymol blue, and 1 g of bromocresol green were dissolved in 1000 g of 95% ethanol aqueous solution to prepare a color developing solution;

[0073] Step 2: 200 g of silica gel (particle size of 100-500 μm), 200 g of starch, 500 g of the color development solution obtained in step 1, and 100 g of deionized water were mixed and stirred to obtain a color development premix;

[0074] Step 3: The color development premix obtained in step 2 is evenly spread on a PET film substrate, and dried at 60° C. until the moisture content of the color development premix is ​​13.6%, thereby obtaining a detection tape with a color development portion thickness of about 3 mm.

[0075] Example 7

[0076] This embodiment provides a detection tape, and its composition and preparation method are as follows:

[0077] Step 1: 2 g of methyl red, 1 g of thymol blue, and 1 g of bromocresol green were dissolved in 1000 g of 95% ethanol aqueous solution to prepare a color developing solution;

[0078] Step 2: 200 g of silica gel (with a particle size of 100-500 μm), 200 g of starch, 10 g of acrylic pressure-sensitive adhesive, 200 g of the color-developing solution obtained in step 1, and 100 g of deionized water are mixed and stirred to obtain a color-developing premix;

[0079] Step 3: The color development premix obtained in step 2 is evenly spread on a PET film substrate, and dried at 60° C. until the moisture content of the color development premix is ​​15.7%, thereby obtaining a detection tape with a color development portion thickness of about 3 mm.

[0080] Example 8

[0081] This embodiment provides a detection tape, and its composition and preparation method are as follows:

[0082] Step 1: 2 g of methyl red, 1 g of thymol blue, and 1 g of bromocresol green were dissolved in 1000 g of 95% ethanol aqueous solution to prepare a color developing solution;

[0083] Step 2: 200 g of silica gel (with a particle size of 100-500 μm), 200 g of starch, 10 g of acrylic pressure-sensitive adhesive, 500 g of the color-developing solution obtained in step 1, and 100 g of deionized water are mixed and stirred to obtain a color-developing premix;

[0084] Step 3: The color development premix obtained in step 2 is evenly spread on a PET film substrate, and dried at 60° C. until the moisture content of the color development premix is ​​5.2%, thereby obtaining a detection tape with a color development portion thickness of about 3 mm.

[0085] Example 9

[0086] This embodiment provides a detection tape, and its composition and preparation method are as follows:

[0087] Step 1: 2 g of methyl red, 1 g of thymol blue, and 1 g of bromocresol green were dissolved in 1000 g of 95% ethanol aqueous solution to prepare a color developing solution;

[0088] Step 2: 200 g of silica gel (with a particle size of 100-500 μm), 200 g of starch, 10 g of acrylic pressure-sensitive adhesive, 500 g of the color-developing solution obtained in step 1, and 100 g of deionized water are mixed and stirred to obtain a color-developing premix;

[0089] Step 3: The color development premix obtained in step 2 is evenly spread on a PET film substrate, and dried at 60° C. until the moisture content of the color development premix is ​​8.4%, thereby obtaining a detection tape with a color development portion thickness of about 1.5 mm.

[0090] Example 10

[0091] This embodiment provides a detection tape, and its composition and preparation method are as follows:

[0092] Step 1: 2 g of methyl red, 1 g of thymol blue, and 1 g of bromocresol green were dissolved in 1000 g of 95% ethanol aqueous solution to prepare a color developing solution;

[0093] Step 2: 200 g of silica gel (with a particle size of 100-500 μm), 200 g of starch, 10 g of acrylic pressure-sensitive adhesive, 500 g of the color-developing solution obtained in step 1, and 100 g of deionized water are mixed and stirred to obtain a color-developing premix;

[0094] Step 3: The color development premix obtained in step 2 is evenly spread on a PET film substrate, and dried at 60° C. until the moisture content of the color development premix is ​​7.4%, thereby obtaining a detection tape with a color development portion thickness of 0.5 mm.

[0095] Embodiment 11

[0096] This embodiment provides a detection tape, and its composition and preparation method are as follows:

[0097] Step 1: 2 g of methyl red, 1 g of thymol blue, and 1 g of bromocresol green were dissolved in 1000 g of 95% ethanol aqueous solution to prepare a color developing solution;

[0098] Step 2: 200 g of silica gel (particle size of 100-500 μm), 200 g of acrylic pressure-sensitive adhesive, 500 g of the color development solution obtained in step 1, and 20 g of deionized water are mixed and stirred to obtain a color development premix;

[0099] Step 3: The color development premix obtained in step 2 is evenly spread on a PET film substrate, and dried at 60° C. until the moisture content of the color development premix is ​​6.9%, thereby obtaining a detection tape with a color development portion thickness of 0.5 mm.

[0100] Example 12

[0101] This embodiment provides a detection tape, and its composition and preparation method are as follows:

[0102] Step 1: 2 g of methyl red, 1 g of thymol blue, and 1 g of bromocresol green were dissolved in 1000 g of 95% ethanol aqueous solution to prepare a color developing solution;

[0103] Step 2: 200 g of silica gel (with a particle size of 100-500 μm), 100 g of acrylic pressure-sensitive adhesive, 500 g of the color-developing solution obtained in step 1, and 20 g of deionized water were mixed and stirred to obtain a color-developing premix;

[0104] Step 3: The color development premix obtained in step 2 is evenly spread on a PET film substrate, and dried at 60° C. until the moisture content of the color development premix is ​​9.1%, thereby obtaining a detection tape with a color development portion thickness of 0.5 mm.

[0105] Example 13

[0106] This embodiment provides a detection tape, and its composition and preparation method are as follows:

[0107] Step 1: 2 g of methyl red, 1 g of thymol blue, and 1 g of bromocresol green were dissolved in 1000 g of 95% ethanol aqueous solution to prepare a color developing solution;

[0108] Step 2: 200 g of silica gel (with a particle size of 200-300 μm), 100 g of acrylic pressure-sensitive adhesive, 500 g of the color-developing solution obtained in step 1, and 20 g of deionized water were mixed and stirred to obtain a color-developing premix;

[0109] Step 3: The color development premix obtained in step 2 is evenly spread on a PET film substrate, and dried at 60° C. until the moisture content of the color development premix is ​​7.7%, thereby obtaining a detection tape with a color development portion thickness of about 0.5 mm.

[0110] Embodiment 14

[0111] This embodiment provides a detection tape, and its composition and preparation method are as follows:

[0112] Step 1: 2 g of methyl red, 1 g of thymol blue, and 1 g of bromocresol green were dissolved in 1000 g of 95% ethanol aqueous solution to prepare a color developing solution;

[0113] Step 2: 200 g of silica gel (with a particle size of 800-1000 μm), 100 g of acrylic pressure-sensitive adhesive, 500 g of the color-developing solution obtained in step 1, and 20 g of deionized water are mixed and stirred to obtain a color-developing premix;

[0114] Step 3: The color development premix obtained in step 2 is evenly spread on a PET film substrate, and dried at 60° C. until the moisture content of the color development premix is ​​6.3%, thereby obtaining a detection tape with a color development portion thickness of 0.5 mm.

[0115] Comparative Example 1

[0116] This comparative example provides a detection tape, and its composition and preparation method are as follows:

[0117] Step 1: dissolving 1 g of methyl red in 1000 g of 95 wt % ethanol aqueous solution to prepare a color developing solution;

[0118] Step 2: 400 g of bentonite (with the same particle size as in Example 2) and 100 g of the color development solution obtained in step 1 and 100 g of deionized water were mixed and stirred to obtain a color development premix;

[0119] Step 3: The color premix obtained in step 2 is evenly spread on the BOPP office tape (a substrate with an adhesive layer), and dried at 60°C until the moisture content of the color premix is ​​11.3%, to obtain a test tape with a color development portion thickness of about 1 mm.

[0120] Comparative Example 2

[0121] This comparative example provides a detection tape, and its composition and preparation method are as follows:

[0122] Step 1: 1 g of methyl red was dissolved in 1000 g of 95% ethanol aqueous solution to prepare a color developing solution;

[0123] Step 2: 400 g of bentonite (with the same particle size as in Example 2) and 500 g of the color development solution obtained in step 1 and 100 g of deionized water were mixed and stirred to obtain a color development premix;

[0124] Step 3: The color premix obtained in step 2 is evenly spread on the BOPP office tape (a substrate with an adhesive layer), and dried at 60° C. until the moisture content of the color premix is ​​0.2%, to obtain a test tape with a color development portion thickness of about 1 mm.

[0125] Comparative Example 3

[0126] This comparative example provides a detection tape, and its composition and preparation method are as follows:

[0127] Step 1: dissolving 1 g of methyl red in 1000 g of 95 wt % ethanol aqueous solution to prepare a color developing solution;

[0128] Step 2: 400 g of bentonite (particle size 100-1000 μm) was mixed with 500 g of the color development solution obtained in step 1 and 100 g of deionized water to obtain a color development premix;

[0129] Step 3: The color premix obtained in step 2 is evenly spread on the BOPP office tape (a substrate with an adhesive layer), and dried at 60° C. until the moisture content of the color premix is ​​2.3%, to obtain a test tape with a color development portion thickness of about 1 mm.

[0130] Test Case

[0131] 1. Fitting effect

[0132] Good lamination effect: After the tape is attached to the surface of the object to be tested, more than 95% of the target area is covered by the color-developing part, and there are no obvious bubbles, corner warping, etc.

[0133] The lamination effect is moderate: after the tape is attached to the surface of the object to be tested, 80%-95% of the target area is covered by the color-developing part, with a small amount of bubbles and slight corner warping.

[0134] Poor lamination effect: After the tape is attached to the surface of the object to be tested, less than 80% of the target area is covered by the color-developing part, and a large number of bubbles, severe corner warping, and even tape falling off appear.

[0135] 2. Color development time

[0136] The time from when the electrolyte (1 mol / L LiPF6, EC / EMC / DEC (mass ratio 3:5:2) electrolyte) drips onto the sample surface to when the color development part shows visible color change.

[0137] 3. Color depth

[0138] The depth of color change can be determined by the naked eye, dark red is deep and light red is light.

[0139] 4. Color preservation time

[0140] After the test, store at room temperature until the color-developed part begins to mold or turn black.

[0141] 5. Difficulty of cleaning after testing

[0142] Difficult to clean: After the test, the tape has obvious slag, and more than 30% of the color development area has paste residue;

[0143] Medium: After the test, a small amount of tape residue falls off, and 10%-30% of the color development area has a paste-like residue

[0144] Easy: After the test, there is no obvious slag on the tape, and less than 10% of the color development area has a paste-like residue.

[0145] The specific test results are shown in the table below:

[0146] Table 1

[0147] Example Fitting effect Color development time Color depth Color preservation time Ease of cleaning after testing Example 1 good 3s deep 20 days easy Example 2 medium 2s shallow 3 days easy Example 3 good 2s shallow 3 days difficulty Example 4 good 3s shallow 3 days difficulty Example 5 good 3s shallow 3 days difficulty Example 6 medium 2s deep 3 days difficulty Example 7 medium 2s deep 5 days difficulty Example 8 good 2s deep 5 days medium Example 9 good 1s deep 5 days medium Example 10 good 1s deep 5 days medium Embodiment 11 good 1s deep 20 days easy Example 12 good 1s deep 20 days easy Example 13 good ＜1s deep 20 days easy Embodiment 14 good 2s deep 20 days easy Comparative Example 1 good No color change No color change No color change difficulty Comparative Example 2 Difference 3s shallow 5 days easy Comparative Example 3 Difference 2s shallow 5 days easy

[0148] From the data in the above table, it can be seen that by comparing Examples 1-14 with Comparative Example 1, it can be seen that the color developer needs a certain amount before it changes color. When the color developer content is less than 0.02%, the color development part does not change color, and when the color developer content is greater than 0.4%, the color development depth of the color development part is deeper; by comparing Examples 2-3 with Comparative Example 2, it can be seen that when the water content after baking is less than 1%, the color development speed and the bonding effect will deteriorate; by comparing Examples 2-3 with Comparative Example 3, it can be seen that the addition of the second base starch can improve the bonding effect of the tape, but the starch will become moldy and shorten the color development storage time; by comparing Examples 2-3 with Comparative Example 3, it can be seen that the addition of the second base starch can improve the bonding effect of the tape, but the starch will become moldy and shorten the color development storage time; It can be seen from Examples 2-5 that the presence of starch can easily make it difficult to clean up after the test, and when the water content is greater than 10%, the color-developing part is likely to remain on the sample and is difficult to clean; from Examples 8-10, it can be seen that the thickness of the color-developing part will affect the color-developing speed, and the optimal thickness of the color-developing part is 0.5-1.5mm; from Examples 10-11, it can be seen that using acrylic glue instead of starch will not change the color-developing effect, but will increase the color-developing storage time; from Examples 11-14, it can be seen that the particle size of the first matrix silica gel will affect the color-developing speed, and the optimal particle size of the first matrix is ​​200-300μm.

[0149] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the scope of protection of the invention.

Claims

1. A detection tape, characterized in that: It comprises a substrate and a color developing portion, wherein the color developing portion is arranged on at least a portion of a surface of one side of the substrate; Wherein, based on the total mass of the color developing part, the components are included in the following mass percentages: First base: 0-65%, second base: 20%-92%, developer: 0.02-0.8%, water 1%-30%.

2. The detection tape according to claim 1, characterized in that: The first matrix includes at least one of silica gel and bentonite; And / or, the second matrix includes at least one of starch, starch derivatives, cellulose derivatives, acrylic pressure-sensitive adhesives, polyvinyl pyrrolidone, polyethylene glycol or polyvinyl alcohol.

3. The detection tape according to claim 2, characterized in that: The content of the first matrix is ​​20%-65%; And / or, the content of the second matrix is ​​20%-40%.

4. The detection tape according to any one of claims 1 to 3, characterized in that: The particle size of the first matrix is ​​100-1000 μm, optionally 100-500 μm, further optionally 200-300 μm.

5. The detection tape according to any one of claims 1 to 3, characterized in that: Also includes an adhesive layer, the adhesive layer is arranged between the color development part and the substrate; Alternatively, the adhesive layer is disposed around the color development portion.

6. The detection tape according to any one of claims 1 to 3, characterized in that: The thickness of the color developing part is 0.5-3 mm; optionally 0.5-1.5 mm; And / or, the water content of the color developing part is 5%-10%.

7. The detection tape according to any one of claims 1 to 3, characterized in that: The color developer includes at least one of methyl orange, methyl red, m-methyl red, phenol red, Congo red, naphthalene red, chlorophenol red, bromophenol red, cresol red, neutral red, fluorescent orange-red, acid metamin yellow, dadan yellow, nitrate yellow, bromocresol purple, bromocresol green, bromochlorophenol blue, p-ethoxychrysanthemum orange, p-bromobenzenesulfonyl chloride, tetrabromophenol blue, resorcinol blue, phenolphthalein, o-cresolphthalein, o-cresolphthalein, tetrabromophenolsulfonephenolphthalein, m-cresol, litmus, litmus essence, bromothymol blue, thymol blue, benzoyl G, sodium p-nitrobenzene azo salicylate, and sodium 4-nitrobenzene azo-1-naphthol-3,6-disulfonate; And / or, the adhesive layer includes at least one of an acrylic pressure-sensitive adhesive, a polyolefin pressure-sensitive adhesive, and a rubber pressure-sensitive adhesive; And / or, the substrate is made of a transparent material, optionally one of polypropylene, polyvinyl chloride, and polyethylene.

8. A method for preparing the detection tape according to any one of claims 1 to 4, characterized in that: The steps include: S1, mixing the components of the color development part, the organic solvent and water to obtain a premix; S2, spreading the premix on at least a portion of the surface of one side of the substrate, and drying to obtain the detection tape.

9. The method for preparing the detection tape according to claim 8, characterized in that: The method also includes the step of preparing an adhesive layer on the surface of the substrate in advance; Alternatively, in step S2, an adhesive layer is prepared around the dried premix.

10. Use of the detection tape according to any one of claims 1 to 7 or the adhesive prepared by the preparation method according to any one of claims 8 to 9 in battery leakage detection.

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