Method for testing peel strength between butyl rubber and glass

Abstract

The invention provides a method for testing the peel strength between butyl rubber and glass, which comprises the following steps: preparing a test sample, adhering edge sealing adhesive tapes to the outer sides of front glass, a butyl rubber strip and rear glass, and enabling one end of each edge sealing adhesive tape to positively and linearly protrude along the outer side of the butyl rubber strip to serve as a test end; the testing end is turned over by 180 degrees, the edge sealing adhesive tape is reversely pulled at a constant speed through the testing end, if the edge sealing adhesive tape pulls the butyl adhesive tape out of the interior of the front glass and the interior of the rear glass, the applied force when the butyl adhesive tape is pulled out is X, and if the edge sealing adhesive tape does not pull the butyl adhesive tape out of the interior of the front glass and the interior of the rear glass, one end of the butyl adhesive tape is turned over by 180 degrees; the butyl rubber strip is pulled out in the reverse direction at a constant speed, the force applied when the butyl rubber strip is pulled out is X ', and the peel strength is calculated according to X or X'. The butyl rubber strip is overturned by 180 degrees from the edges of the front glass and the rear glass, so that the butyl rubber strip is prevented from being broken, and the method can be used for detecting the peel strength between the butyl rubber and the glass.

Description

Technical Field

[0001] The present invention relates to the technical field of peel strength testing, and particularly to a method for testing the peel strength between butyl rubber and glass. Background Art

[0002] Currently, high-efficiency heterojunction solar cell modules mostly adopt microcrystalline technology, and in the future, silver-coated copper pastes will be introduced to reduce costs. These two materials are extremely sensitive to water vapor. At the same time, due to the high packaging cost of EPE / POE, many manufacturers now introduce an EVA + butyl rubber packaging solution to improve the water resistance rate and reduce the cost of the adhesive film.

[0003] Butyl rubber itself has excellent water resistance, but as a new packaging material, butyl rubber is not compatible with the detection methods and standards of existing packaging materials. In addition, during the use of butyl rubber, the adhesion to glass is not strong, and there is a risk of being torn off when tearing the edge sealing tape. Moreover, although the water resistance performance of butyl rubber itself is excellent, if the adhesion effect between butyl rubber and glass is poor, water vapor will still pass through the middle of the two and seep into the interior of the battery module, reducing the performance of the battery module and damaging the aesthetics of the battery module.

[0004] Due to the characteristics of butyl rubber itself, it is impossible to test the adhesion of butyl rubber using traditional small samples of glass / adhesive film / back glass. Butyl rubber itself will directly break, and there is currently no effective test method for the adhesion (peel strength) between butyl rubber and glass. Summary of the Invention

[0005] The present invention provides a method for testing the peel strength between butyl rubber and glass. By flipping and pulling the butyl rubber 180° from the edge of the front and rear glasses, the breakage of the butyl rubber is avoided, and it can be used to detect the peel strength (adhesion) between butyl rubber and glass.

[0006] The technical solution of the present invention is realized as follows: A method for testing the peel strength between butyl rubber and glass, comprising the following steps:

[0007] Step 1, prepare a test sample. The test sample includes a front glass, an adhesive film layer, and a rear glass arranged in sequence from top to bottom. A ring of butyl rubber strip is pasted between the edges of the front glass and the rear glass. A part of the width of the butyl rubber strip is located inside the front glass and the rear glass, and the other part is located outside the front glass and the rear glass. A ring of edge sealing tape is adhered to the outside of the front glass, the butyl rubber strip, and the rear glass. One end of the edge sealing tape protrudes linearly forward along the outside of the butyl rubber strip, and this end is used as the test end;

[0008] Step 2: Flip the test end in Step 1 by 180°, and pull the edge-sealing tape backward at a constant speed through the test end. If the edge-sealing tape completely pulls out the butyl rubber strip from the interior of the front and rear glasses, the force applied when the butyl rubber strip is pulled out is X, and the peel strength between the butyl rubber and the glass L is the width of the butyl rubber strip located inside the front and rear glasses;

[0009] Step 3: If in Step 2, the edge-sealing tape does not pull out the butyl rubber strip from the interior of the front and rear glasses, apply a pulling force to one end of the butyl rubber strip to flip it by 180°, and pull the butyl rubber strip backward at a constant speed to completely pull out the butyl rubber strip from between the front and rear glasses. At this time, the force applied when the butyl rubber strip is pulled out is X', and the peel strength between the butyl rubber and the glass L is the width of the butyl rubber strip located inside the front and rear glasses.

[0010] Further, in Step 1, the method for preparing the test sample is as follows:

[0011] (1) Stick a circle of butyl rubber strip on the edge at the upper end of the rear glass. A part of the width of the butyl rubber strip is located inside the rear glass, and the other part is located outside the rear glass;

[0012] (2) Lay a glue film layer in the middle of the rear glass;

[0013] (3) Then cover the front glass on the upper side of the butyl rubber strip and the glue film layer, and align the front glass and the rear glass vertically;

[0014] (4) Finally, use an edge-sealing tape to seal the outermost sides of the front glass, the butyl rubber strip, and the rear glass, and perform lamination in a laminator to complete the preparation of the test sample.

[0015] Further, it further includes Step 4: If the butyl rubber strip still cannot be pulled out in Step 3, repeat Step 1 to re-prepare the test sample, reduce the value of L, and then repeat Step 3;

[0016] Repeat Step 4 for N times, where N is an integer greater than or equal to 1, and each time the value of L is reduced by 1 mm or 2 mm until the butyl rubber strip is completely pulled out from between the front and rear glasses in Step 3.

[0017] Further, in Step 1, the head and tail joints of the butyl rubber strip and the edge-sealing tape are aligned.

[0018] Further, the distance between the butyl rubber strip and the glue film layer is 0 - 6 mm.

[0019] Further, the glue film layer includes a front glue layer and a rear glue layer stacked on top of each other.

[0020] Further, both the front glass and the rear glass are embossed glass.

[0021] Further, in Steps 2 and 3, the speed of reverse uniform pulling is 80 - 120 mm / min.

[0022] Advantages of the present invention:

[0023] The testing method of the present invention flips and pulls the butyl rubber at 180° from the edges of the front and rear glasses instead of pulling from the front and back sides of the glass, avoiding the breakage of the butyl rubber. It can be used to detect the peel strength (adhesive force) between the butyl rubber and the glass, and further screen and monitor the butyl rubbers from different manufacturers or specifications to ensure that the selected butyl rubber has good adhesion to the glass, thereby ensuring excellent water-blocking effect of the photovoltaic cell module.

[0024] The setting of the edge-sealing tape in the present invention, on the one hand, shapes the butyl rubber strip through the edge-sealing tape, further avoiding the breakage of the butyl rubber strip during the pulling process. On the other hand, through the setting of the edge-sealing tape, it is convenient for the fixture of the tensile machine or tensiometer to clamp, avoiding the situation that the exposed part of the butyl rubber strip is too narrow to be clamped and apply tension. At the same time, the edge-sealing tape also prevents the butyl rubber from sticking to the laminator and affecting the use of the laminator. Description of the Drawings

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0026] Figure 1 It is a top view of the test sample of the present invention;

[0027] Figure 2 is Figure 1 a cross-sectional view taken along A - A in

[0028] Figure 3 It is a schematic diagram of pulling the edge-sealing tape in Embodiment 1;

[0029] Figure 4 It is a schematic diagram of pulling the butyl rubber strip in Embodiment 2.

[0030] Rear glass 1, butyl rubber strip 2, adhesive film layer 3, front glass 4, edge-sealing tape 5, test end 6. Detailed Embodiments

[0031] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0032] Embodiment 1

[0033] A test method for the peel strength between butyl rubber and glass includes the following steps:

[0034] Step 1: As Figure 1 and 2 shown, prepare a test sample, including the following steps:

[0035] (1) Select embossed glass of 300*300*2.0 mm (or other similar specifications such as 300*150*2.0 mm) as the rear glass 1. Stick a circle of butyl rubber strips 2 on the edge at the upper end of the rear glass 1. A part of the width of the butyl rubber strip 2 is inside the rear glass 1, and the other part is outside the rear glass 1;

[0036] (2) Lay a glue film layer 3 in the middle of the rear glass 1. The glue film layer 3 includes a front glue layer and a rear glue layer stacked up and down. The distance between the butyl rubber strip 2 and the glue film layer 3 is 0-6 mm, and the specific distance depends on the melt index of the glue film and butyl rubber. Specifically, it depends on whether there are no obvious air bubbles and lack of glue between the butyl rubber and the glue film after lamination;

[0037] (3) Then cover the front glass 4 on the upper side of the butyl rubber strip 2 and the glue film layer 3. The specification of the front glass 4 is the same as that of the rear glass 1, and the front glass 4 and the rear glass 1 are aligned up and down;

[0038] (4) Finally, use a sealing tape 5 to seal the outermost sides of the front glass 4, the butyl rubber strip 2 and the rear glass 1. The head and tail joints of the butyl rubber strip 2 are aligned with the head and tail joints of the sealing tape 5. One end of the sealing tape 5 protrudes linearly forward along the outside of the butyl rubber strip 2, and this end is used as the test end 6. Laminate the sealed sample in a laminator to complete the preparation of the test sample. The lamination parameters of the test sample are the same as those used in the production line for producing heterojunction batteries.

[0039] Step 2: As Figure 3 shown, use a tensile machine or a puller to clamp the test end 6 of the sealing tape 5, turn it 180°, and pull the sealing tape 5 backward at a uniform speed. Figure 3The arrow direction in [description] is the direction of reverse uniform pulling. The speed of reverse uniform pulling is 80 - 120 mm / min. The butyl rubber strip 2 is adhered to the edge sealing tape 5. If the edge sealing tape 5 completely pulls out the butyl rubber strip 2 from the inside of the front and rear glasses, at this time, the force applied when the butyl rubber strip 2 is pulled out is X, with the unit of N, and the peel strength between the butyl rubber and the glass L is the width of the butyl rubber strip 2 located inside the front and rear glasses, with the unit of cm.

[0040] Example 2

[0041] This example is basically the same as Example 1, except that: Step 3, if in Step 2, the edge sealing tape 5 does not pull out the butyl rubber strip 2 from the inside of the front and rear glasses, then use a tool to cut open the connection between the head and tail of the butyl rubber strip 2. As Figure 4 shown, use a tensile testing machine or a puller to clamp the butyl rubber strip 2 outside the front and rear glasses, so that one end of the butyl rubber strip 2 is flipped 180°, and pull the butyl rubber strip 2 in the reverse uniform direction, Figure 4 The arrow direction in [description] is the direction of reverse uniform pulling. The speed of reverse uniform pulling is 80 - 120 mm / min. Pull the butyl rubber strip 2 completely out from between the front and rear glasses. At this time, the force applied when the butyl rubber strip 2 is pulled out is X', and the peel strength between the butyl rubber and the glass L is the width of the butyl rubber strip 2 located inside the front and rear glasses.

[0042] Example 3

[0043] This example is basically the same as Example 2, except that: Step 4, if the butyl rubber strip still cannot be pulled out in Step 3, repeat Step 1 to re-prepare the test sample, and reduce the L value, then repeat Step 3; Step 4 is repeated N times, where N is an integer ≥ 1, and the L value is reduced by 1 mm or 2 mm each time, until in Step 3, the butyl rubber strip is completely pulled out from between the front and rear glasses.

[0044] Specifically: If the butyl rubber strip still cannot be pulled out in Step 3, re-prepare the sample, reduce the L value by 1 mm or 2 mm, and then perform Step 3. If the butyl rubber strip 2 is completely pulled out from between the front and rear glasses this time, record the X' value and the L value when the butyl rubber strip 2 is pulled out this time, and the peel strength between the butyl rubber and the glass

[0045] If the butyl rubber strip 2 still cannot be pulled out from between the front and rear glasses this time, then repeat the above steps, reducing the L value by 1 mm or 2 mm each time, until the butyl rubber strip 2 is completely pulled out from between the front and rear glasses.

[0046] The above is only the preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A test method for the peel strength between butyl rubber and glass, characterized in that, It includes the following steps: Step 1: Prepare a test sample. The test sample includes a front glass, a glue film layer, and a rear glass arranged in sequence from top to bottom. A ring of butyl rubber strip is pasted between the edges of the front glass and the rear glass. A part of the width of the butyl rubber strip is located inside the front glass and the rear glass, and the other part is located outside the front glass and the rear glass. A ring of edge-sealing tape is adhered to the outside of the front glass, the butyl rubber strip, and the rear glass. One end of the edge-sealing tape protrudes linearly forward along the outside of the butyl rubber strip, and this end is used as the test end. Step 2: Flip the test end by 180°, and pull the edge-sealing tape backward at a constant speed through the test end. If the edge-sealing tape completely pulls out the butyl rubber strip from the inside of the front and rear glasses, the force applied when the butyl rubber strip is pulled out at this time is X, and the peel strength between the butyl rubber and the glass L is the width of the butyl rubber strip located inside the front and rear glasses; Step 3: If in Step 2, the edge-sealing tape fails to pull the butyl rubber strip out from the interior of the front and rear glasses, apply a pulling force to one end of the butyl rubber strip to turn it 180°, and pull the butyl rubber strip in the reverse direction at a uniform speed to completely pull the butyl rubber strip out from between the front and rear glasses. At this time, the force applied when the butyl rubber strip is pulled out is X', and the peel strength between the butyl rubber and the glass L is the width of the butyl rubber strip located inside the front and rear glasses.

2. The test method for the peel strength between butyl rubber and glass according to claim 1, wherein In Step 1, the method for preparing the test sample is as follows: (1) Paste a ring of butyl rubber strip on the upper edge of the rear glass. A part of the width of the butyl rubber strip is located on the rear glass, and the other part is located outside the rear glass. (2) Lay the glue film layer in the middle of the rear glass. (3) Then cover the front glass on the upper side of the butyl rubber strip and the glue film layer, and align the front glass and the rear glass vertically. (4) Finally, use the edge-sealing tape to seal the outermost sides of the front glass, the butyl rubber strip, and the rear glass, and perform lamination in a laminator to complete the preparation of the test sample.

3. The test method for the peel strength between butyl rubber and glass according to claim 1, characterized in that, It also includes Step 4: If the butyl rubber strip has not been pulled out in Step 3, repeat Step 1 to re-prepare the test sample, reduce the value of L, and then repeat Step 3. Step 4 is repeated N times, where N is an integer greater than or equal to 1. Each time, the value of L is reduced by 1 mm or 2 mm until the butyl rubber strip is completely pulled out from between the front and rear glasses in Step 3.

4. The test method for the peel strength between butyl rubber and glass according to claim 1 or 2, characterized in that In Step 1, the head and tail joints of the butyl rubber strip and the edge-sealing tape are aligned.

5. The test method for the peel strength between butyl rubber and glass according to claim 1 or 2, characterized in that The distance between the butyl rubber strip and the glue film layer is 0 - 6 mm.

6. The test method for the peel strength between butyl rubber and glass according to claim 1 or 2, characterized in that, The glue film layer includes a front glue layer and a rear glue layer stacked on top of each other.

7. The testing method for the peel strength between butyl rubber and glass according to claim 1 or 2, characterized in that, Both the front glass and the rear glass are embossed glass.

8. The testing method for the peel strength between butyl rubber and glass according to claim 1, characterized in that, In Steps 2 and 3, the speed of reverse uniform pulling is 80 - 120 mm / min.

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