CN117686386A - Method for testing fluidity of bonding sheet - Google Patents
Method for testing fluidity of bonding sheet Download PDFInfo
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- CN117686386A CN117686386A CN202311671142.6A CN202311671142A CN117686386A CN 117686386 A CN117686386 A CN 117686386A CN 202311671142 A CN202311671142 A CN 202311671142A CN 117686386 A CN117686386 A CN 117686386A
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- bonding sheet
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- radius
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- 238000012360 testing method Methods 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000003825 pressing Methods 0.000 claims abstract description 14
- 238000005520 cutting process Methods 0.000 claims abstract description 10
- 239000011148 porous material Substances 0.000 claims abstract description 8
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 6
- 239000010959 steel Substances 0.000 claims abstract description 6
- 239000000463 material Substances 0.000 claims abstract description 5
- 239000000853 adhesive Substances 0.000 claims description 21
- 230000001070 adhesive effect Effects 0.000 claims description 21
- 239000002655 kraft paper Substances 0.000 claims description 5
- 239000004642 Polyimide Substances 0.000 claims description 4
- 229920001721 polyimide Polymers 0.000 claims description 4
- 229920001935 styrene-ethylene-butadiene-styrene Polymers 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 2
- 239000011347 resin Substances 0.000 abstract description 13
- 229920005989 resin Polymers 0.000 abstract description 13
- 239000000945 filler Substances 0.000 abstract description 11
- 239000000758 substrate Substances 0.000 abstract description 8
- 239000004215 Carbon black (E152) Substances 0.000 abstract description 3
- 229930195733 hydrocarbon Natural products 0.000 abstract description 3
- 150000002430 hydrocarbons Chemical class 0.000 abstract description 3
- 238000004806 packaging method and process Methods 0.000 abstract description 3
- 239000003292 glue Substances 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 238000012545 processing Methods 0.000 description 5
- 230000002159 abnormal effect Effects 0.000 description 4
- 238000003475 lamination Methods 0.000 description 4
- 238000010998 test method Methods 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 239000004820 Pressure-sensitive adhesive Substances 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005530 etching Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 239000012761 high-performance material Substances 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000012779 reinforcing material Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Adhesives Or Adhesive Processes (AREA)
Abstract
The invention discloses a method for testing fluidity of a bonding sheet, which specifically comprises the following steps: (1) Cutting the bonding sheet into squares, superposing the squares, and forming a round hole by taking the center of the squares as the center of the circle to obtain an open pore bonding sheet; (2) Combining and pressing the perforated bonding sheet, the buffer material, the steel plate, the PP sheet and the PP sheet carrier to obtain a pressed bonding sheet; (3) Measuring the circle radius of the pressed bonding sheet, and measuring 4 symmetry axes with square requirements, wherein the total radius is 8, and the four symmetry axes are respectively recorded as R 1 ‑R 8 With the radius R of the round hole ((R-R) 1 )+(R‑R 2 )+(R‑R 3 )+(R‑R 4 )+(R‑R 5 )+(R‑R 6 )+(R‑R 7 )+(R‑R 8 ) And (3) calculating to obtain the fluidity C/F of the bonding sheet. The invention is more suitable for the current high-filler filling and/or low-flow resin system, and can be suitable for measuring the resin flow of bonding sheets of high-heat dissipation, packaging substrates, high-frequency hydrocarbon plates and low-flow prepregs. Moreover, the testing method has the advantages of high efficiency, accurate judgment result and the like.
Description
Technical Field
The invention relates to the technical field of fluidity test, in particular to a fluidity test method for a bonding sheet.
Background
With the rapid development of high density, miniaturization, high precision and multifunctional technology in the electronic field, electronic components, packaging materials, circuit substrates and the like are developed in the directions of high reliability, high heat conduction, high heat and humidity resistance, low stress, low expansion coefficient, low water absorption, easy processing and the like. In recent years, research on high heat conductivity, packaging substrates, hydrocarbon high-frequency copper-clad plates and the like in the copper-clad plate industry has such demands, and the preparation of the high-performance material is required, wherein a key solution is to increase the filling amount of filler in a glue system.
However, the main disadvantages caused by the increased filling amount of the filler are that the viscosity is increased and the fluidity is greatly reduced, so that the processing window of the prepared bonding sheet is extremely narrow, if the fluidity control of the bonding sheet is not proper, phenomena such as adhesive shortage, dry plate and the like caused by insufficient fluidity are extremely easy to occur after lamination, the uniformity of the plate thickness is easy to be poor due to good fluidity, the resin flows excessively, and finally the yield of the product is low. Therefore, the fluidity test and control of the adhesive sheet are particularly important.
The IPC (International Association of electronic industry) has proposed a resin fluidity test method for prepregs in its standard specification IPC-TM-6502.3.17, but the method is only applicable to prepregs with larger fluidity, and has not met the requirements for high filler filled systems. The structure updates a resin fluidity test method of the non-flowing prepreg in 2.3.17.2, two circular holes with the radius of 12.7mm are punched on the basis of a prepreg test sample of the original method, and the fluidity of the prepreg is represented by measuring the difference between the maximum radius and the minimum radius of the circular holes after the test is finished.
Therefore, how to better measure the resin fluidity of the adhesive sheet is a problem that needs to be solved by those skilled in the art.
Disclosure of Invention
Accordingly, the present invention is directed to a method for testing fluidity of adhesive sheet, which solves the shortcomings of the prior art. The adhesive sheet can be applied to the Printed Circuit Board (PCB) industry.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the method for testing the fluidity of the bonding sheet specifically comprises the following steps:
(1) Cutting the bonding sheet into squares, superposing the squares, and forming a round hole by taking the center of the squares as the center of the circle to obtain an open pore bonding sheet;
(2) Combining and pressing the perforated bonding sheet, the buffer material, the steel plate, the PP sheet and the PP sheet carrier to obtain a pressed bonding sheet;
(3) Measuring the circle radius of the pressed bonding sheet, and measuring 4 symmetry axes with square requirements, wherein the total radius is 8, and the four symmetry axes are respectively recorded as R 1 -R 8 With the radius R of the round hole ((R-R) 1 )+(R-R 2 )+(R-R 3 )+(R-R 4 )+(R-R 5 )+(R-R 6 )+(R-R 7 )+(R-R 8 ) And (3) calculating to obtain the fluidity C/F of the bonding sheet.
Further, in the step (1), the side length of the square is 97-107mm, preferably 102mm.
Further, in the step (1), the number of superimposed adhesive sheets is 2 to 4 sheets, preferably 2 sheets.
Further, in the step (1), the radius of the circular hole is 25 to 45mm, preferably 30 to 40mm.
Further, in the step (2), the buffer material is required to have uniform heat conduction and to withstand a high temperature for a certain time, such as kraft paper.
Further, in the above step (2), the PP sheet carrier is required to be resistant to deformation under pressure and to withstand a high temperature for a certain time, such as polyimide or SEBS film.
Further, in the step (2), the pressing temperature is 140 to 200 ℃, preferably 150 to 180 ℃, and more preferably 171 ℃; the pressing pressure is 100-300Psi, preferably 150-250Psi, more preferably 200Psi; the pressing time is 10min.
Furthermore, in the step (2), the 4 symmetry axes (8 radiuses) to be measured are drawn before lamination, so that the measurement after lamination is more accurate.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention increases the cavity area, reduces the compression area during pressing, increases the surface pressure, increases the flow of a high-filler filling filler system or a low-fluidity bonding sheet, and can better and accurately compare the fluidity gap.
2. According to the invention, the flow rate is calculated by measuring the radius of the circle before and after pressing, so that the flow rate difference of different bonding sheets is compared.
3. The testing method of the invention does not need specific equipment, the round size can be adjusted by a conventional round cutting tool, and the testing of a high filling filler system and a low fluidity bonding sheet can be faster and more accurate according to actual needs.
4. The invention provides a novel bonding sheet fluidity testing method system which is more suitable for the current high-filler filling and/or low-fluidity resin system and can be suitable for measuring the resin fluidity of bonding sheets of high-heat dissipation, packaging substrates, high-frequency hydrocarbon plates and low-fluidity prepregs. Moreover, the testing method has the advantages of high efficiency, accurate judgment result and the like.
5. The testing method is particularly suitable for testing the fluidity of the bonding sheet of a high-filler filling system or a low-fluidity resin system, can effectively test the fluidity difference, reduces the defects of extremely narrow processing window of the prepared bonding sheet caused by the high-filler system, and is extremely easy to cause the phenomena of adhesive shortage, dry plate or overlarge adhesive flow caused by insufficient fluidity after lamination, and the like, thereby lowering the yield of products.
Drawings
FIG. 1 is a schematic illustration of the fluidity test method for the adhesive sheet of examples 1-3 of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
The method for testing the fluidity of the bonding sheet, as shown in fig. 1, specifically comprises the following steps:
(1) Cutting the bonding sheet into square with side length of 97mm, superposing 2 sheets, and opening a round hole with radius of 25mm by taking the center of the square as the center of a circle to obtain an open pore bonding sheet;
(2) Combining the perforated bonding sheet, kraft paper, steel plate, PP sheet and polyimide, and pressing for 10min at 140 ℃ under 100Psi pressure to obtain a pressed bonding sheet;
(3) Measuring the circle radius of the pressed bonding sheet, and measuring 4 symmetry axes with square requirements, wherein the total radius is 8, and the four symmetry axes are respectively recorded as R 1 -R 8 With the radius R of the round hole ((R-R) 1 )+(R-R 2 )+(R-R 3 )+(R-R 4 )+(R-R 5 )+(R-R 6 )+(R-R 7 )+(R-R 8 ) And (3) calculating to obtain the fluidity C/F of the bonding sheet.
Example 2
The method for testing the fluidity of the bonding sheet, as shown in fig. 1, specifically comprises the following steps:
(1) Cutting the bonding sheet into square with side length of 102mm, superposing 2 sheets, and opening a round hole with radius of 40mm by taking the center of the square as the center of the circle to obtain an open pore bonding sheet;
(2) Combining the perforated bonding sheet, kraft paper, steel plate, PP sheet and polyimide, and pressing for 10min under the conditions of the temperature of 171 ℃ and the pressure of 200Psi to obtain a pressed bonding sheet;
(3) Measuring the circle radius of the pressed bonding sheet, and measuring 4 symmetry axes with square requirements, wherein the total radius is 8, and the four symmetry axes are respectively recorded as R 1 -R 8 With the radius R of the round hole ((R-R) 1 )+(R-R 2 )+(R-R 3 )+(R-R 4 )+(R-R 5 )+(R-R 6 )+(R-R 7 )+(R-R 8 ) And (3) calculating to obtain the fluidity C/F of the bonding sheet.
Example 3
The method for testing the fluidity of the bonding sheet, as shown in fig. 1, specifically comprises the following steps:
(1) Cutting the bonding sheet into a square with the side length of 107mm, superposing 4 sheets, and opening a round hole with the radius of 45mm by taking the center of the square as the center of a circle to obtain an open pore bonding sheet;
(2) Combining the perforated bonding sheet, kraft paper, steel plate, PP sheet and SEBS film, and pressing for 10min at 200 ℃ under 300Psi pressure to obtain a pressed bonding sheet;
(3) Measuring the circle radius of the pressed bonding sheet, and measuring 4 symmetry axes with square requirements, wherein the total radius is 8, and the four symmetry axes are respectively recorded as R 1 -R 8 With the radius R of the round hole ((R-R) 1 )+(R-R 2 )+(R-R 3 )+(R-R 4 )+(R-R 5 )+(R-R 6 )+(R-R 7 )+(R-R 8 ) And (3) calculating to obtain the fluidity C/F of the bonding sheet.
Comparative example 1
The method for testing the fluidity of the bonding sheet specifically comprises the following steps with reference to IPC-TM-6502.3.17:
(1) Cutting the bonding sheet into square with the side length of 102mm, and superposing 2 sheets to obtain a superposed bonding sheet;
(2) Laminating the overlapped bonding sheets for 10min under the conditions of the temperature of 171 ℃ and the pressure of 200Psi to obtain laminated bonding sheets;
(3) The weight of the superimposed adhesive sheet is recorded as W 1 A wafer having a diameter of 81.1mm was punched from the center of the pressure-sensitive adhesive sheet using a press die, and the weight of the wafer was recorded as W 2 According to the formula (W 1 -W 2 )/W 1 The flow percentage of the adhesive sheet is calculated as x 100%.
Comparative example 2
The method for testing the fluidity of the bonding sheet refers to IPC-TM-6502.3.17 and specifically comprises the following steps of:
(1) Cutting the bonding sheet into square with side length of 102mm, superposing 2 sheets, and forming two round holes with radius of 12.7mm in the middle of the bonding sheet to obtain an open pore bonding sheet;
(2) Pressing the perforated bonding sheet for 10min under the conditions of the temperature of 171 ℃ and the pressure of 200Psi to obtain a pressed bonding sheet;
(3) Measuring the radius of three parts of the open pore bonding sheet at 60 degrees apart, taking the average value of the radii as R, measuring the minimum radius and the maximum radius formed by resin flow of the bonding sheet and punched by the pressed bonding sheet, and respectively recording the minimum radius and the maximum radius as R Minimum of And R is Maximum value Minimum fluidity of R-R Maximum value Maximum fluidity of R-R Minimum of 。
Performance testing
Resin glue solutions with different filler ratios and different proportions are prepared, 1080# glass cloth is used as a reinforcing material, the prepared resin glue solution is soaked, and the resin glue solution is baked at a certain temperature to prepare bonding sheets 1-9, and the detailed parameters are shown in table 1.
TABLE 1 preparation parameters of adhesive sheets 1-9
Each of the adhesive sheets 1 to 9 was tested for fluidity and substrate (copper clad laminate) performance in accordance with the methods of examples 1 to 3 and comparative examples 1 to 2, respectively.
The preparation method and the testing method of the copper foil-clad laminate are as follows: cutting bonding sheets according to a certain size, overlapping a plurality of sheets of the bonding sheets in order, coating the electrolytic copper foil on both sides, pressurizing, heating and curing in a vacuum press to obtain a copper-clad plate, etching, observing whether the appearance is lack of glue and a dry plate, and measuring whether the thickness is abnormal due to overlarge thickness difference.
The test results are shown in Table 2.
TABLE 2 fluidity of adhesive sheets 1-9 and substrate Performance test results
Note that: in Table 2, delta represents that the adhesive shortage occurs due to excessive adhesive flow and the thickness is uneven; o represents no abnormality; x represents that the gumming is too small and a dry plate appears.
As is clear from table 2, the comparative examples 1 and 2 have too small a change in fluidity, and cannot effectively reflect the relationship between the fluidity and the occurrence of the shortage of the adhesive, the dry plate, the uneven plate thickness, and the absence of the abnormal condition, and the fluidity of the adhesive sheet cannot be controlled, so that the reject ratio caused by a series of problems such as the dry plate of the adhesive bleeding caused by the too narrow processing window is reduced.
Comparison with comparative examples 1 and 2 shows that examples 1 to 3 of the present invention can effectively react the relation between fluidity and occurrence of lack of adhesive on the substrate, dry plate, uneven plate thickness, and no abnormal condition. Meanwhile, the comparison of examples 1-3 shows that the proper conditions can more accurately reflect the relation between the fluidity and the occurrence of the shortage of glue, the non-uniformity of the dry plate and the plate thickness of the substrate and no abnormal condition. The method for testing the fluidity of the bonding sheet can reduce the reject ratio caused by a series of problems such as gumming dry plate and the like caused by the over-narrow processing window by controlling the fluidity of the bonding sheet.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (7)
1. The method for testing the fluidity of the bonding sheet is characterized by comprising the following steps of:
(1) Cutting the bonding sheet into squares, superposing the squares, and forming a round hole by taking the center of the squares as the center of the circle to obtain an open pore bonding sheet;
(2) Combining and pressing the perforated bonding sheet, the buffer material, the steel plate, the PP sheet and the PP sheet carrier to obtain a pressed bonding sheet;
(3) Measuring circle radius of pressed bonding sheet, the measurement requirement is square4 symmetry axes of the shape, 8 radii in total, respectively denoted R 1 -R 8 With the radius R of the round hole ((R-R) 1 )+(R-R 2 )+(R-R 3 )+(R-R 4 )+(R-R 5 )+(R-R 6 )+(R-R 7 )+(R-R 8 ) And (3) calculating to obtain the fluidity C/F of the bonding sheet.
2. The method of claim 1, wherein in step (1), the square has a side length of 97-107mm.
3. The method of claim 1, wherein in step (1), the number of superimposed adhesive sheets is 2 to 4.
4. The method of claim 1, wherein in step (1), the radius of the circular hole is 25-45mm.
5. The method of claim 1, wherein in step (2), the buffer material is kraft paper.
6. The method of claim 1, wherein in step (2), the PP sheet carrier is polyimide or SEBS film.
7. The method according to claim 1, wherein in the step (2), the pressing temperature is 140-200 ℃, the pressing pressure is 100-300Psi, and the time is 10min.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311671142.6A CN117686386A (en) | 2023-12-07 | 2023-12-07 | Method for testing fluidity of bonding sheet |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311671142.6A CN117686386A (en) | 2023-12-07 | 2023-12-07 | Method for testing fluidity of bonding sheet |
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| CN117686386A true CN117686386A (en) | 2024-03-12 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10123041A (en) * | 1996-10-24 | 1998-05-15 | Nippon Avionics Co Ltd | Method and jig for measurement of viscosity |
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| CN106524882A (en) * | 2016-11-22 | 2017-03-22 | 上海美维科技有限公司 | Press flatness test method |
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| WO2023005111A1 (en) * | 2021-07-27 | 2023-02-02 | 生益电子股份有限公司 | Rigid-flex board and manufacturing method therefor |
| CN116614943A (en) * | 2023-06-21 | 2023-08-18 | 生益电子股份有限公司 | PCB and Z-direction interconnection method thereof |
-
2023
- 2023-12-07 CN CN202311671142.6A patent/CN117686386A/en active Pending
Patent Citations (7)
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|---|---|---|---|---|
| JPH10123041A (en) * | 1996-10-24 | 1998-05-15 | Nippon Avionics Co Ltd | Method and jig for measurement of viscosity |
| CN201298010Y (en) * | 2008-11-27 | 2009-08-26 | 陕西科技大学 | A printing ink fluidity test device |
| CN106524882A (en) * | 2016-11-22 | 2017-03-22 | 上海美维科技有限公司 | Press flatness test method |
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| WO2023005111A1 (en) * | 2021-07-27 | 2023-02-02 | 生益电子股份有限公司 | Rigid-flex board and manufacturing method therefor |
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| CN116614943A (en) * | 2023-06-21 | 2023-08-18 | 生益电子股份有限公司 | PCB and Z-direction interconnection method thereof |
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