Method for testing adhesiveness of adhesive tape

Abstract

The invention discloses an adhesive tape adhesiveness testing method, and relates to the technical field of adhesiveness testing, and the method comprises the following steps: selecting a clean substrate with a flat surface, weighing the net weight W1 of the substrate, then coating the substrate with a coating, and weighing the weight W2 of the coating after the coating is dried and cured; vertically and crossly drawing grids on the coating on the surface of the substrate by using a cutter to form array grids; adhering one end of an adhesive tape to one end of the array grid area, and rolling the adhesive tape from the end to the other end until the adhesive tape is adhered to the other end of the array grid area; waiting time and a tearing angle are set, after the waiting time is over, the free end of the adhesive tape is held by hand, the adhesive tape is torn off from the surface of the coating of the base plate at the tearing angle, and stable speed and strength are kept in the tearing process; and the weight W3 of the torn substrate is weighed, and the percentage P of the mass of the removed paint is calculated, so that an accurate P value can be obtained, a more accurate test result can be obtained, accurate comparison of materials with equivalent adhesive force is facilitated, and the detection error is extremely small.

Description

Technical Field

[0001] The invention relates to the technical field of adhesion testing, and in particular to a method for testing the adhesion of an adhesive tape. Background Art

[0002] Adhesion of tape refers to the ability of the tape to adhere to the surface of the object being adhered. Adhesion is one of the key indicators of tape quality, which determines whether the tape can function stably in various applications. The magnitude of adhesion depends on the interaction between the tape and the surface of the object being adhered, which may include various mechanisms such as physical adsorption and chemical bonding.

[0003] For example, PU glue, also known as bottom glue, molding glue, or white glue, has a chemical name of polyurethane resin. PU glue has excellent bonding strength, good heat and weather resistance, is colorless and translucent, environmentally friendly and non-toxic, easy to operate, and suitable for assembly line production. It is the most widely used high-end plastic glue because of its plump surface, wear resistance, impact resistance, yellowing resistance, UV aging resistance, never hardening, and its long-term stability.

[0004] Adhesion refers to the firmness between the adhesive and the coated film. The adhesion performance between the coating and the substrate is directly related to the service life and safety of the product. In the prior art, the adhesion test of the surface coating of optical plastics generally adopts the cross-cut method and the circle method. The national standard GB9286-1998 stipulates the method of measuring the adhesion of the adhesive film by the cross-cut method, and GB1720 stipulates the method of measuring the adhesion of the adhesive film by the circle method. However, both methods are indirect measurement methods. The adhesion is evaluated according to the grade, and the test error is large. It is impossible to judge the adhesion of coatings at the same level. Summary of the invention

[0005] The purpose of the present invention is to provide a method for testing the adhesion of an adhesive tape to solve the following technical problems:

[0006] How to get more accurate tape adhesion test results.

[0007] The purpose of the present invention can be achieved by the following technical solutions:

[0008] The present invention discloses a method for testing the adhesion of an adhesive tape, which is carried out in sequence according to the following steps:

[0009] S1, select a substrate with a flat and clean surface, weigh its net weight W1, then apply a coating on the substrate, let the coating dry and solidify, and weigh its weight W2;

[0010] S2, using a cutter to draw vertical cross grids on the coating on the surface of the substrate, so that the cutter cuts through the coating to the surface of the substrate to form an array of square grids;

[0011] S3, attaching one end of the tape to one end of the array grid area, and then rolling the tape from the end to the other end until the tape is attached to the other end of the array grid area;

[0012] S4, setting the waiting time and the tearing angle. When the waiting time is over, holding the free end of the tape, tearing the tape off from the coating surface of the substrate at the tearing angle, and maintaining a stable speed and force during the tearing process;

[0013] S5. Weigh the weight W3 of the torn substrate and calculate the percentage P of the paint peeling mass. The calculation formula is: P=(W2-W3) / (W2-W1).

[0014] Furthermore, the test method is used to test the adhesion of a tape, the adhesion of a coating or the adhesion of a substrate.

[0015] Furthermore, when the test method is used to test the adhesion of a tape, the tape is a tape to be tested; the substrate includes a glass plate or a plastic plate; the coating includes any one of a polyurethane coating, a polyvinyl chloride coating, a polytetrafluoroethylene coating, an epoxy resin coating, an acrylic resin coating, and a silicone resin coating.

[0016] Furthermore, when the test method is used to test the adhesion of a coating, the coating is a coating to be tested; the substrate includes a glass plate, a plastic plate or other plate that is specifically combined with the coating to be tested; the tape includes any one of PU tape, BOPP tape, PVC tape, and PE tape.

[0017] Further, when the test method is used to test the adhesion of a substrate, the substrate is a substrate to be tested, the coating includes any one of a polyurethane coating, a polyvinyl chloride coating, a polytetrafluoroethylene coating, an epoxy resin coating, an acrylic resin coating, a silicone resin coating, or a coating that is specifically combined with the substrate to be tested, and the tape includes any one of a PU tape, a BOPP tape, a PVC tape, and a PE tape.

[0018] Furthermore, when weighing, a milligram electronic scale or other high-precision balance scale is selected.

[0019] Furthermore, in step S2, the side length of the array grid is 1 mm or 2 mm.

[0020] Furthermore, in step S2, the cutting tool is a grid cutter, and the spacing between blades of the grid cutter is the side length of the array grid.

[0021] Furthermore, in step S3, the tape is rolled from one end to the other end by fingers or a rubber roller.

[0022] Further, in step S4, the waiting time is 1-2 minutes, and the tearing angle is 60°C or 90°C.

[0023] Furthermore, the adhesive tape does not have a chemically corrosive effect on the coating.

[0024] Beneficial effects of the present invention:

[0025] (1) In the test method for adhesive tape adhesion of the present invention, a substrate with a flat and clean surface is selected, and its net weight W1 is weighed, and then a coating is applied on the substrate. After the coating is dried and cured, its weight W2 is weighed; a cutter is used to draw vertical cross grids on the coating on the surface of the substrate, so that the cutter cuts through the coating to the surface of the substrate to form an array of squares; one end of the tape is attached to one end of the array of squares, and then the tape is rolled from the end to the other end until the tape is attached to the other end of the array of squares; a waiting time and a tearing angle are set, and when the waiting time is over, the free end of the tape is held and the tape is torn off from the coating surface of the substrate at the tearing angle, and a stable speed and force are maintained during the tearing process; the weight W3 of the substrate after tearing is weighed, and the percentage P of the paint loss mass is calculated, and the calculation formula is: P = (W2-W3) / (W2-W1); an accurate P value can be obtained, and thus a more accurate test result can be obtained, which is conducive to accurate comparison of materials with equivalent adhesion, and the detection error is extremely small. The detection method is simple and suitable for popular use.

[0026] (2) The test method for the adhesion of the tape of the present invention can be applied to different application scenarios. For example, the adhesion of the tape, the adhesion of the coating and the adhesion of the substrate can be tested through a single factor change detection test, and then the adhesion effect of different materials can be obtained. When the test method is used to test the adhesion of the tape, only the type of tape is changed to ensure that the conditions of the substrate and the coating are the same; when the test method is used to test the adhesion of the coating, only the type of coating is changed to ensure that the conditions of the substrate and the tape are the same; when the test method is used to test the adhesion of the substrate, only the type of substrate is changed to ensure that the conditions of the tape and the coating are the same; the appropriate test conditions can be selected according to the needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention will be further described below in conjunction with the accompanying drawings.

[0028] Figure 1 It is a schematic diagram of the observation results of the adhesion test of the torn plastic plate in Example 1 using the international Hundred Grid method in the test example of the present invention;

[0029] Figure 2 It is a schematic diagram of the observation results of the adhesion test of the torn plastic plate in Example 1 using the international Hundred Grid method in the test example of the present invention;

[0030] Figure 3It is a schematic diagram of the observation results of the adhesion test of the torn plastic plate in Example 1 using the international bicelle method in the test example of the present invention. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] The experimental methods in the following examples, unless otherwise specified, are all conventional methods, and are performed according to the techniques or conditions described in the literature in the field or according to the product instructions. The materials used in the following examples, unless otherwise specified, can all be obtained from commercial sources.

[0033] The present invention discloses a method for testing the adhesion of an adhesive tape, which is used to test the adhesion of an adhesive tape, the adhesion of a coating or the adhesion of a substrate. According to different test purposes, the materials used in the following method are different, and are specifically divided into the following three situations:

[0034] (1) When the test method is used to test the adhesion of a tape, the tape is the tape to be tested; the substrate includes a glass plate or a plastic plate; the coating includes any one of a polyurethane coating, a polyvinyl chloride coating, a polytetrafluoroethylene coating, an epoxy resin coating, an acrylic resin coating, and a silicone resin coating;

[0035] (2) When the test method is used to test the adhesion of a coating, the coating is a coating to be tested; the substrate includes a glass plate, a plastic plate or other plate that is specifically combined with the coating to be tested; the tape includes any one of PU tape, BOPP tape, PVC tape and PE tape;

[0036] (3) When the test method is used to test the adhesion of a substrate, the substrate is a substrate to be tested, the coating includes any one of a polyurethane coating, a polyvinyl chloride coating, a polytetrafluoroethylene coating, an epoxy resin coating, an acrylic resin coating, a silicone resin coating, or a coating that is specifically combined with the substrate to be tested, and the tape includes any one of a PU tape, a BOPP tape, a PVC tape, and a PE tape.

[0037] The method is carried out in the following steps:

[0038] S1, select a substrate with a flat and clean surface, weigh its net weight W1, then apply a coating on the substrate, let the coating dry and solidify, and weigh its weight W2;

[0039] S2, using a cutter to draw vertical cross grids on the coating on the surface of the substrate, so that the cutter cuts through the coating to the surface of the substrate to form an array of square grids;

[0040] S3, attaching one end of the tape to one end of the array grid area, and then rolling the tape from the end to the other end until the tape is attached to the other end of the array grid area;

[0041] S4, setting the waiting time and the tearing angle. When the waiting time is over, holding the free end of the tape, tearing the tape off from the coating surface of the substrate at the tearing angle, and maintaining a stable speed and force during the tearing process;

[0042] S5. Weigh the weight W3 of the torn substrate and calculate the percentage P of the paint peeling mass. The calculation formula is: P=(W2-W3) / (W2-W1).

[0043] Example 1

[0044] The method of the present invention is used to detect the adhesion of the PU tape, and the specific steps are as follows:

[0045] S1. Select a plastic plate with a smooth and clean surface, and weigh its weight W1 with a milligram electronic scale (model: Jutian JS-A7), W1 = 35.534g, then apply a layer of polyurethane coating with a thickness of 1mm on the plastic plate, and then place it in an oven and dry it at 80°C for 6h to dry and solidify the coating, and weigh its weight W2, W2 = 38.216g;

[0046] S2. Use a cutter such as a grid knife with a blade spacing of 1 mm to draw vertical cross-grids on the coating on the surface of the substrate, so that the grid knife cuts through the polyurethane coating to the surface of the plastic plate to form 300 array squares of 10 rows × 30 columns, and the side length of each square is 1 mm; use a soft cloth to gently wipe off the coating residue produced by cutting;

[0047] S3, stick one end of a PU tape with a width of 1 cm to one end (row end) of the array grid area, and then roll the tape from this end to the other end using an auxiliary tool such as a rubber roller to fully remove the air between the PU tape and the polyurethane coating to ensure that the two are completely attached until the PU tape is attached to the other end of the array grid area;

[0048] S4, set the waiting time to 2 minutes and the tearing angle to 60°; when the waiting time is over, hold the free end of the PU tape and tear the PU tape off the polyurethane coating surface of the plastic plate at a tearing angle of 60°, maintaining a stable speed and force during the tearing process;

[0049] S5. Weigh the weight W3 of the torn plastic plate, W3=37.852 g, calculate the percentage P of the paint loss mass, P=(W2-W3) / (W2-W1), and finally calculate P=13.5720%.

[0050] Example 2

[0051] The method of the present invention is used to detect the adhesion of the PU tape, and the specific steps are as follows:

[0052] S1. Select a plastic plate with a flat and clean surface, and weigh its weight W1 with a milligram electronic scale (model: Jutian JS-A7), W1 = 35.524g, then apply a layer of polyurethane coating with a thickness of 1mm on the plastic plate, and then place it in an oven and dry it at 80°C for 6h to dry and solidify the coating, and weigh its weight W2, W2 = 38.286g;

[0053] S2. Use a cutter such as a grid knife with a blade spacing of 1 mm to draw vertical cross-grids on the coating on the surface of the substrate, so that the grid knife cuts through the polyurethane coating to the surface of the plastic plate to form 300 array squares of 10 rows × 30 columns, and the side length of each square is 1 mm; use a soft cloth to gently wipe off the coating residue produced by cutting;

[0054] S3, stick one end of a PU tape with a width of 1 cm to one end (row end) of the array grid area, and then roll the tape from this end to the other end using an auxiliary tool such as a rubber roller to fully remove the air between the PU tape and the polyurethane coating to ensure that the two are completely attached until the PU tape is attached to the other end of the array grid area;

[0055] S4, set the waiting time to 2 minutes and the tearing angle to 60°; when the waiting time is over, hold the free end of the PU tape and tear the PU tape off the polyurethane coating surface of the plastic plate at a tearing angle of 60°, maintaining a stable speed and force during the tearing process;

[0056] S5. Weigh the weight W3 of the torn plastic plate, W3=38.0059 g, calculate the percentage P of the paint loss mass, P=(W2-W3) / (W2-W1), and finally calculate P=10.1421%.

[0057] Example 3

[0058] The method of the present invention is used to detect the adhesion of the PU tape, and the specific steps are as follows:

[0059] S1. Select a plastic plate with a flat and clean surface, and weigh its weight W1 with a milligram electronic scale (model: Jutian JS-A7), W1 = 35.425g, then apply a layer of polyurethane coating with a thickness of 1mm on the plastic plate, and then place it in an oven and dry it at 80°C for 6h to dry and solidify the coating, and weigh its weight W2, W2 = 38.354g;

[0060] S2. Use a cutter such as a grid knife with a blade spacing of 1 mm to draw vertical cross-grids on the coating on the surface of the substrate, so that the grid knife cuts through the polyurethane coating to the surface of the plastic plate to form 300 array squares of 10 rows × 30 columns, and the side length of each square is 1 mm; use a soft cloth to gently wipe off the coating residue produced by cutting;

[0061] S3, stick one end of a PU tape with a width of 1 cm to one end (row end) of the array grid area, and then roll the tape from this end to the other end using an auxiliary tool such as a rubber roller to fully remove the air between the PU tape and the polyurethane coating to ensure that the two are completely attached until the PU tape is attached to the other end of the array grid area;

[0062] S4, set the waiting time to 2 minutes and the tearing angle to 60°; when the waiting time is over, hold the free end of the PU tape and tear the PU tape off the polyurethane coating surface of the plastic plate at a tearing angle of 60°, maintaining a stable speed and force during the tearing process;

[0063] S5. Weigh the weight W3 of the torn plastic plate, W3=37.936 g, calculate the percentage P of the paint loss mass, P=(W2-W3) / (W2-W1), and finally calculate P=14.2569%.

[0064] Test example

[0065] See also Figure 1-3 The plastic plates after tearing in Example 1-3 were tested for paint loss using the international 100-grid method. The paint loss level of the grids was determined by observing the degree of paint loss on the grids. The judgment criteria are as follows:

[0066] Level 0: The cutting edge is completely smooth, the coating inside the grid is complete, there is no shedding, and the adhesion is the best;

[0067] Level 1: A little coating falls off at the intersection of the cuts, but the falling area is no more than 5%, and the adhesion is good;

[0068] Level 2: The coating partially or completely falls off in large pieces along the cutting edge, the falling area is between 5% and 15%, and the adhesion is qualified;

[0069] Level 3: Most or all of the coating falls off in large pieces along the cut edge, with the falling area ranging from 15% to 35%, and the adhesion is poor;

[0070] Level 4: Most or all of the coating falls off along the cutting edge, and the falling area is between 35% and 65%, and the adhesion is very poor;

[0071] Level 5: The coating is almost completely peeled off, the peeling area is greater than 65%, and the adhesion is extremely poor.

[0072] By observing the torn plastic plates in Examples 1-3, it can be determined that the paint peeling conditions of the torn plastic plates in Examples 1-3 are similar, all roughly at level 2, but it is difficult to make an effective judgment if the paint peeling degrees of the three are to be ranked.

[0073] When the test method for adhesive tape adhesion of the present invention is used, the degree of paint loss can be accurately judged by directly comparing the P value, and an accurate result of the degree of adhesion can be obtained, that is, Example 2 is better than Example 1, and Example 1 is better than Example 3; therefore, the test method for adhesive tape adhesion of the present invention is not only simple to operate, but also has more accurate results.

[0074] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A method for testing the adhesion of an adhesive tape, characterized in that: Follow the steps below: S1, select a substrate with a flat and clean surface, weigh its net weight W1, then apply a coating on the substrate, let the coating dry and solidify, and weigh its weight W2; S2, using a cutter to draw vertical cross grids on the coating on the surface of the substrate, so that the cutter cuts through the coating to the surface of the substrate to form an array of square grids; S3, attaching one end of the tape to one end of the array grid area, and then rolling the tape from the end to the other end until the tape is attached to the other end of the array grid area; S4, setting the waiting time and the tearing angle. When the waiting time is over, holding the free end of the tape, tearing the tape off from the coating surface of the substrate at the tearing angle, and maintaining a stable speed and force during the tearing process; S5. Weigh the weight W3 of the torn substrate and calculate the percentage P of the paint peeling mass. The calculation formula is: P=(W2-W3) / (W2-W1).

2. The method for testing the adhesive tape adhesion according to claim 1, characterized in that: The test method is used to test the adhesion of an adhesive tape, the adhesion of a coating or the adhesion of a substrate.

3. The method for testing the adhesive tape adhesion according to claim 2, characterized in that: When the test method is used to test the adhesion of a tape, the tape is a tape to be tested; the substrate includes a glass plate or a plastic plate; the coating includes any one of a polyurethane coating, a polyvinyl chloride coating, a polytetrafluoroethylene coating, an epoxy resin coating, an acrylic resin coating, and a silicone resin coating.

4. The method for testing the adhesive tape adhesion according to claim 2, characterized in that: When the test method is used to test the adhesion of a coating, the coating is a coating to be tested; the substrate includes a glass plate, a plastic plate or other plate that is specifically combined with the coating to be tested; the tape includes any one of PU tape, BOPP tape, PVC tape, and PE tape.

5. The method for testing the adhesive tape adhesion according to claim 2, characterized in that: When the test method is used to test the adhesion of a substrate, the substrate is a substrate to be tested, the coating includes any one of a polyurethane coating, a polyvinyl chloride coating, a polytetrafluoroethylene coating, an epoxy resin coating, an acrylic resin coating, a silicone resin coating, or a coating that is specifically combined with the substrate to be tested, and the tape includes any one of a PU tape, a BOPP tape, a PVC tape, and a PE tape.

6. The method for testing the adhesive tape adhesion according to claim 1, characterized in that: In step S2, the side length of the array grid is 1 mm or 2 mm.

7. The method for testing the adhesive tape adhesion according to claim 6, characterized in that: In step S2, the cutting tool is a grid cutter, and the spacing between the blades of the grid cutter is the side length of the array grid.

8. The method for testing the adhesive tape adhesion according to claim 1, characterized in that: In step S3, the adhesive tape is rolled from one end to the other end by fingers or a rubber roller.

9. The method for testing the adhesive tape adhesion according to claim 1, characterized in that: In step S4, the waiting time is 1-2 minutes, and the tearing angle is 60°C or 90°C.

10. The method for testing the adhesive tape adhesion according to claim 1, characterized in that: The adhesive tape does not chemically attack the coating.

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