Water-based adhesive peel strength test board, test method and application

Abstract

The invention discloses a water-based adhesive peel strength test plate, a test method and application, the test plate sequentially comprises a UHMWPE base material and a porous steel plate from bottom to top, the UHMWPE base material is attached to the porous steel plate, the range of the pore diameter d of the porous steel plate is 0.8-1.2 mm, the range of the pore pitch L of the porous steel plate is 0.8-1.2 mm, and the ratio of the pore diameter d to the pore pitch L of the porous steel plate is 1: 1; the measuring method comprises the following steps: A) dripping a water-based adhesive to be measured into the surface of the porous steel plate of the test plate, and pressing the surface of the porous steel plate; b) curing at a certain temperature for a period of time; c) carrying out 180-degree peeling test at a certain speed by using a peeling test machine; according to the invention, the problems of non-uniform film formation and large test data deviation caused by strong flowability of the traditional thin water-based adhesive are solved, the operation process is simplified, the data repeatability error is less than 5.00%, and the test efficiency and accuracy are remarkably improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of polymer material testing, and particularly relates to a test board, a test method and an application for testing the peel strength of water-based adhesives. Background Art

[0002] The peel strength of an adhesive refers to the maximum force required to peel an adhesive tape from the bonding surface, usually measured in Newtons per meter (N / m). The peel strength reflects the bonding strength of the material and is one of the important indicators for measuring the performance of adhesives. In the prior art, there are difficulties in testing thin adhesives: 1) The traditional peel strength test methods (such as the direct coating method) are not suitable for low-viscosity water-based adhesives. The thin adhesive liquid is prone to sagging or edge shrinkage on the substrate surface, resulting in uneven film thickness and high dispersion of test results (error > 20%). 2) Material specificity limitation: Ultra-high molecular weight polyethylene has a low surface energy and weak polarity. Conventional test devices are difficult to achieve uniform spreading of the adhesive, and data distortion is likely to occur due to interface slippage during the peeling process. 3) High equipment dependence: The prior art mostly relies on complex film coating equipment (such as a spin coater) to control the thickness of the adhesive layer, which is costly and cumbersome to operate and is difficult to apply to on-site rapid testing.

[0003] The invention application with the patent application number 202311208988.6 discloses a method for detecting the vertical peel strength of an adhesive, including the following steps: S1. Making a test workpiece; S2. Applying the adhesive to be tested at a predetermined position on the lower cover plate of the test workpiece, installing a positioning device, and then pressing the upper cover plate and cleaning the residual adhesive outside the pressing position; S3. Placing the test workpiece under specified environmental conditions; S4. Adapting the above workpiece to a universal tensile testing machine through a connecting device, debugging the stretching program, and conducting tests under specified environments; S5. Analyzing the measured vertical peel strength of the adhesive after being placed under different conditions to determine whether the adhesive meets the application requirements. This method belongs to the traditional coating test method and is only suitable for testing water-based adhesives with relatively high viscosities.

[0004] In view of the above problems, there is an urgent need to develop a method for testing the peel strength of water-based adhesives with different viscosities, especially a quantitative evaluation method for the interfacial bonding strength between ultra-high molecular weight polyethylene (UHMWPE) substrates and low-viscosity water-based adhesives. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a test board, a test method and an application for testing the peel strength of water-based adhesives, which solve the problems of uneven film formation and large deviation of test data caused by the strong fluidity of traditional thin water-based adhesives, simplify the operation process, and the data repeatability error is less than 5%, significantly improving the test efficiency and accuracy.

[0006] The content of the present invention includes:

[0007] An aqueous adhesive peel strength test board, from bottom to top in sequence: UHMWPE substrate and perforated steel plate, the UHMWPE substrate is adhered to the perforated steel plate, the pore diameter d of the perforated steel plate ranges from 0.8 - 1.2 mm, the pore spacing L ranges from 0.8 - 1.2 mm, and the pore diameter d of the perforated steel plate: pore spacing L = 1:1; preferably, the pore diameter d of the perforated steel plate is 1 mm and the pore spacing L is 1 mm.

[0008] In one embodiment, the thickness t of the perforated steel plate < 5 mm.

[0009] In one embodiment, the UHMWPE substrate is a UHMWPE film, there is release paper under the UHMWPE film, and the length of the UHMWPE film is longer than the length of the perforated steel plate.

[0010] The function of the release paper is to prevent the aqueous adhesive from sticking to the tabletop.

[0011] Another object of the present invention is to provide a method for testing the peel strength of an aqueous adhesive, including the following steps:

[0012] A) Drop the aqueous adhesive to be tested onto the surface of the perforated steel plate of the test board and press the surface of the perforated steel plate;

[0013] B) Cure the test board after pressing in step A at a certain temperature for a certain period of time;

[0014] C) Use a peel tester to perform a 180° peel test at a certain rate.

[0015] In one embodiment, the viscosity range of the aqueous adhesive is 5 - 2000 mPa·s.

[0016] In one embodiment, the dropping amount of the aqueous adhesive is 3 - 5 ml.

[0017] In one embodiment, in step B, the certain temperature is 50 °C and the certain period of time is 3 h.

[0018] In one embodiment, in step C, the rate of the peel tester is 100 mm / min and the peel test length is 50 mm.

[0019] Another object of the present invention is to provide an application of the above aqueous adhesive peel strength test board in the test of the peel strength of an aqueous adhesive.

[0020] The beneficial effects of the present invention:

[0021] (1) The pore diameter d of the porous steel plate in this application ranges from 0.8 to 1.2 mm, and the pore spacing L ranges from 0.8 to 1.2 mm. By the coordinated control of the pore diameter d and the pore spacing L of the porous steel plate (1:1), the capillary penetration speed and the mechanical support strength are balanced. Using the capillary effect of the porous structure, the adhesive forms a uniform film layer in the pores;

[0022] (2) The porous steel plate of this application can be adapted to adhesives with different viscosities, and water-based adhesives with viscosities ranging from 5 mPa·s to 2000 mPa·s are applicable;

[0023] (3) The solution of this application's scheme solves the problems such as uneven film formation and large deviation in test data caused by the strong fluidity of traditional thin water-based adhesives. The film formed by the test method of this invention is uniform, and the data repeatability error is less than 5.00%, significantly improving the accuracy of the test;

[0024] (4) The test method for the peel strength of the water-based adhesive in this application cures the adhesive to avoid film thickness fluctuations caused by secondary flow of the glue;

[0025] (5) The test board for the peel strength of the water-based adhesive of this invention is easily available, and the test method simplifies the operation process, is simple and efficient, and effectively improves the test efficiency of the peel strength of the adhesive. Description of the Drawings

[0026] Figure 1 It is a sample diagram of the water-based adhesive peel strength test board with a pore diameter of 1 mm after curing and before peeling in Example 2;

[0027] Figure 2 It is a 180° peel test for the water-based adhesive peel strength test board with a pore diameter of 1 mm after curing in Example 2;

[0028] Figure 3 It is the film formation situation on the surface after the peel test of the water-based adhesive peel strength test board with a pore diameter of 1 mm in Example 2. Detailed Description of the Invention

[0029] Example 1

[0030] Preparation of the water-based adhesive peel strength test board (porous steel plates with different pore diameters):

[0031] Prepare a porous steel plate substrate with a length and width of 128 mm × 40 mm, with a pore spacing and thickness of 1.0 mm each. Prepare 15 porous steel plates of four pore diameter specifications with pore diameters of 0.5 mm, 1 mm, 1.5 mm, and 2 mm respectively (60 in total);

[0032] Place a UHMWPE film with a length and width of 200 mm × 25 mm on the release paper. The upper surface of the UHMWPE film adheres to the surface of the perforated steel plate. The UHMWPE film is below and the perforated steel plate is above to make a water-based adhesive peel strength test plate with different pore size specifications.

[0033] Example 2

[0034] Peel strength test of test plates with perforated steel plates of different pore sizes:

[0035] (1) Take 15 water-based adhesive peel strength test plates with pore sizes of 0.5 mm, 1.0 mm, 1.5 mm, and 2 mm prepared in Example 1 respectively (60 in total) and set aside.

[0036] (2) Use a dropper to take 4 ml of the water-based adhesive to be tested with viscosities of 20 mPa·s, 500 mPa·s, 1000 mPa·s, 1500 mPa·s, and 2000 mPa·s respectively and drop them on the surface of the perforated steel plate of the test plate. For example, drop the water-based adhesive to be tested with a viscosity of 20 mPa·s into 3 water-based adhesive peel strength test plates with a pore size of 0.5 mm respectively, drop the water-based adhesive to be tested with a viscosity of 20 mPa·s into 3 water-based adhesive peel strength test plates with a pore size of 1.0 mm respectively, drop the water-based adhesive to be tested with a viscosity of 20 mPa·s into 3 water-based adhesive peel strength test plates with a pore size of 1.5 mm respectively, drop the water-based adhesive to be tested with a viscosity of 20 mPa·s into 3 water-based adhesive peel strength test plates with a pore size of 2.0 mm respectively; the same operation is performed for other water-based adhesives to be tested with different viscosities; through capillary penetration, the adhesive penetrates through the small holes and is evenly distributed on the surface of the UHMWPE film, and the gap between the UHMWPE film and the perforated steel plate is discharged by pressing.

[0037] (3) Cure at 50 °C for 3 h.

[0038] (4) Use a peel tester to perform a 180° peel test at a rate of 100 mm / min.

[0039] The relevant test results are shown in Table 1.

[0040] Example 3

[0041] Preparation of water-based adhesive peel strength test plate (perforated steel plate with different hole spacings):

[0042] (1) Prepare 3 porous steel plates with a thickness of 1 mm, a length of 128 mm, and a width of 40 mm, with a pore diameter of 1.0 mm and a pore spacing of 0.5 mm, 3 porous steel plates with a pore diameter of 1.5 mm and a pore spacing of 1.5 mm, 3 porous steel plates with a pore diameter of 0.8 mm and a pore spacing of 0.8 mm, 3 porous steel plates with a pore diameter of 1.2 mm and a pore spacing of 1.2 mm, and 3 porous steel plates with a pore diameter of 0.5 mm and a pore spacing of 0.3 mm;

[0043] Take another 15 UHMWPE films with a length of 200 mm and a width of 25 mm and place them on the release paper. The upper surface of the UHMWPE film adheres to the surface of the above-mentioned porous steel plate. The UHMWPE film is below and the porous steel plate is above to make a water-based adhesive peel strength test plate with different pore diameter / pore spacing specifications.

[0044] (2) Use a dropper to take 4 ml of the water-based adhesive to be tested with a viscosity of 20 mPa·s and drop it on the surface of the porous steel plate of the test plate. Drop the water-based adhesive to be tested with a viscosity of 20 mPa·s onto 3 water-based adhesive peel strength test plates with a pore diameter of 1.0 mm and a pore spacing of 0.5 mm respectively, drop the water-based adhesive to be tested with a viscosity of 20 mPa·s onto 3 water-based adhesive peel strength test plates with a pore diameter of 1.5 mm and a pore spacing of 1.5 mm respectively, drop the water-based adhesive to be tested with a viscosity of 20 mPa·s onto 3 water-based adhesive peel strength test plates with a pore diameter of 0.8 mm and a pore spacing of 0.8 mm respectively, drop the water-based adhesive to be tested with a viscosity of 20 mPa·s onto 3 water-based adhesive peel strength test plates with a pore diameter of 1.2 mm and a pore spacing of 1.2 mm respectively, and drop the water-based adhesive to be tested with a viscosity of 20 mPa·s onto 3 water-based adhesive peel strength test plates with a pore diameter of 0.5 mm and a pore spacing of 0.3 mm respectively; Through capillary penetration, the adhesive penetrates through the small holes and is evenly distributed on the surface of the UHMWPE film. Exhaust the gap between the UHMWPE film and the porous steel plate by pressing;

[0045] (3) Cure at 50 °C for 3 h;

[0046] (4) Use a peel tester to perform a 180° peel test at a rate of 100 mm / min.

[0047] The relevant test results are shown in Table 2.

[0048] Comparative Example 1

[0049] (1) Take 15 sheets of UHMWPE film with dimensions of 200 mm × 25 mm, and evenly coat the water-based adhesives to be tested (with viscosities of 20 mPa·s, 500 mPa·s, 1000 mPa·s, 1500 mPa·s, and 2000 mPa·s respectively) on the film surface. Coat 3 sheets of film with each viscosity of water-based adhesive.

[0050] (2) Take 15 sheets of non-porous steel plates with dimensions of 128 mm × 40 mm and a thickness of 1 mm, and bond them to the surface of the UHMWPE after coating with the water-based adhesive, and perform pressing to extrude air bubbles and voids.

[0051] (3) Cure at a temperature of 50 °C for 3 h.

[0052] (4) Conduct a 180° peel test through a peel tester at a rate of 100 mm / min; compare the specific results of the above tests with the test results of the water-based adhesive peel strength test plate with a pore diameter of 1.0 mm and a pore spacing of 1.0 mm. The results are shown in Table 3.

[0053] Table 1 Peel strength test of test plates of porous steel plates with different pore diameters

[0054]

[0055]

[0056] Judging from Table 1 above, the film-forming uniformity evaluations of test plates of porous steel plates with different pore diameters are different in adhesives with different viscosities. Only for the test plates of steel plates with a pore diameter and a pore spacing of 1.0 mm, when the adhesive viscosity ranges from 20 - 2000 mPa·s, the film formation is uniform without defects, and the error rate is less than 5.00% (the error rate is the relative standard deviation RSD = (standard deviation / average value) * 100%).

[0057] Table 2 Peel strength test data of test plates of porous steel plates with different pore spacings

[0058]

[0059]

[0060] Judging from Table 2 above, the film-forming uniformity of test plates of porous steel plates with different pore diameters / pore spacings is different in the adhesive with a viscosity of 20 mPa·s. Only for the test plates of porous steel plates with a pore diameter / pore spacing ratio of 1:1 and a pore diameter and a pore spacing in the range of 0.8 - 1.2 mm, the film formation is uniform without defects, and the error rate is less than 5.00%.

[0061] Table 3 Peel strength test data of different test methods

[0062]

[0063] As can be seen from Table 3, the final results of the samples tested in the present invention are all very stable, and the error rates are all less than 5%. By testing with the traditional coating method of Comparative Example 1, it can be found that when the viscosity of the water-based adhesive is <500 mPa·s, the error is large, and the traditional coating method is only suitable for testing water-based adhesives with a relatively high viscosity.

[0064] Those of ordinary skill in the art should understand that the discussion of any of the above embodiments is merely exemplary and is not intended to imply that the scope of protection of the present application is limited to these examples; within the concept of the present application, the technical features in the above embodiments or different embodiments can also be combined, and the steps can be implemented in any order, and there are many other variations in different aspects of one or more embodiments of the present application as described above, which are not provided in detail for the sake of brevity.

[0065] One or more embodiments of the present application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the present application. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of one or more embodiments of the present application shall be included within the scope of protection of the present application.

Claims

1. A water-based adhesive peel strength test board, characterized in that, From bottom to top, they are: UHMWPE substrate and perforated steel plate. The UHMWPE substrate is adhered to the perforated steel plate. The aperture d of the perforated steel plate ranges from 0.8 to 1.2 mm, and the hole pitch L ranges from 0.8 to 1.2 mm. The aperture d of the perforated steel plate: hole pitch L = 1:

1.

2. The water-based adhesive peel strength test board according to claim 1, characterized in that, The aperture d of the perforated steel plate is 1 mm, and the hole pitch L is 1 mm.

3. The water-based adhesive peel strength test board according to claim 1 or 2, characterized in that, The thickness t of the perforated steel plate is less than 5 mm.

4. The water-based adhesive peel strength test board according to claim 1 or 2, characterized in that, The UHMWPE substrate is a UHMWPE film. There is release paper under the UHMWPE film. The length of the UHMWPE film is longer than the length of the perforated steel plate.

5. A method for testing the peel strength of an aqueous adhesive, characterized in that, It includes the following steps: A) Drop the water-based adhesive to be tested onto the surface of the perforated steel plate of the test plate according to any one of claims 1-4, and press the surface of the perforated steel plate. B) Cure the test plate after pressing in step A at a certain temperature for a certain period of time. C) Use a peel tester to perform a 180° peel test at a certain rate.

6. The method for testing the peel strength of the aqueous adhesive according to claim 5, characterized in that, The viscosity range of the water-based adhesive is 5-2000 mPa·s.

7. The method for testing the peel strength of the aqueous adhesive according to claim 5, characterized in that, The dropping amount of the water-based adhesive is 3-5 ml.

8. The method for testing the peel strength of the water-based adhesive according to any one of claims 5-7, characterized in that, In step B, the certain temperature is 50 °C, and the certain period of time is 3 h.

9. The method for testing the peel strength of the water-based adhesive according to any one of claims 5 to 7, characterized in that, In step C, the rate of the peel tester is 100 mm / min, and the peel test length is 50 mm.

10. Application of a water-based adhesive peel strength test plate according to any one of claims 1-4 in the water-based adhesive peel strength test.

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