CN113295603B - Experimental method for verifying stripping of epoxy glue and bracket of outdoor lamp bead - Google Patents
Experimental method for verifying stripping of epoxy glue and bracket of outdoor lamp bead Download PDFInfo
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- CN113295603B CN113295603B CN202110559915.6A CN202110559915A CN113295603B CN 113295603 B CN113295603 B CN 113295603B CN 202110559915 A CN202110559915 A CN 202110559915A CN 113295603 B CN113295603 B CN 113295603B
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- 239000011324 bead Substances 0.000 title claims abstract description 111
- 238000002474 experimental method Methods 0.000 title claims abstract description 74
- 229920006335 epoxy glue Polymers 0.000 title abstract description 9
- 238000000034 method Methods 0.000 claims abstract description 13
- 229920006332 epoxy adhesive Polymers 0.000 claims abstract description 12
- 238000013508 migration Methods 0.000 claims abstract description 10
- 230000005012 migration Effects 0.000 claims abstract description 10
- 230000008569 process Effects 0.000 claims abstract description 7
- 238000012360 testing method Methods 0.000 claims description 18
- 238000010438 heat treatment Methods 0.000 claims description 16
- 238000001816 cooling Methods 0.000 claims description 12
- 238000001514 detection method Methods 0.000 claims description 12
- 238000001035 drying Methods 0.000 claims description 8
- 230000003116 impacting effect Effects 0.000 claims description 5
- 238000010521 absorption reaction Methods 0.000 claims description 2
- 230000009286 beneficial effect Effects 0.000 abstract description 5
- 230000002349 favourable effect Effects 0.000 abstract description 4
- 239000000463 material Substances 0.000 description 6
- 230000008859 change Effects 0.000 description 4
- 239000004593 Epoxy Substances 0.000 description 3
- 239000003822 epoxy resin Substances 0.000 description 2
- 238000009863 impact test Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229920000647 polyepoxide Polymers 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 230000006798 recombination Effects 0.000 description 1
- 238000005215 recombination Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000002604 ultrasonography Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N17/00—Investigating resistance of materials to the weather, to corrosion, or to light
- G01N17/002—Test chambers
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- Ecology (AREA)
- Environmental & Geological Engineering (AREA)
- Environmental Sciences (AREA)
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- Health & Medical Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
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- Immunology (AREA)
- Pathology (AREA)
- Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
Abstract
The invention discloses an experimental method for verifying the peeling of an epoxy adhesive and a bracket of an outdoor lamp bead, which relates to the field of LED components. The invention has the beneficial effects that: the reliability experiment scheme can verify that the failure risk of lamp bead death, blackening and migration of the lamp bead caused by stripping of the epoxy adhesive and the lamp bead support is favorable for improving the stability of the display screen; the problem that the lamp beads fail due to the fact that the lamp bead epoxy glue is stripped in the use process of the client is effectively intercepted.
Description
Technical Field
The invention relates to the field of LED components, in particular to an experimental method for verifying the peeling of an epoxy adhesive and a bracket of an outdoor lamp bead.
Background
An LED is a solid state semiconductor device that converts electrical energy into light energy. The light-condensing device has the advantages of low power consumption, good light-condensing effect, high reaction speed, strong controllability, capability of bearing high impact force, long service life, environmental protection and the like. LEDs are gradually replacing traditional light sources and become fourth generation light sources. However, the LED lamp bead epoxy resin packaging material has the defects of large brittleness, poor impact resistance, easy aging and the like, and the phenomena of lamp bead death, internal blackening, migration and the like caused by the fact that the lamp bead is subjected to moisture-bearing epoxy resin and the bracket are stripped in the short-term use process of a client.
The result of the verification experiment method in the prior art is that the lamp bead is invalid due to falling of the lamp bead welding ball or breakage of welding spots, and the lamp bead invalidation caused by stripping of the lamp bead epoxy adhesive and the lamp bead support cannot be verified.
In view of this, the present inventors have conducted intensive studies on the above problems, and have produced the present invention.
Disclosure of Invention
Aiming at the problems in the prior art, the invention discloses a method for verifying the stripping of an outdoor lamp bead epoxy adhesive and a bracket, which utilizes a severe reliability experiment scheme to carry out experiments on the outdoor lamp bead and detect the lamp bead death, the bracket blackening and migration.
The reliability experiment scheme can verify that the failure risk of lamp bead death, blackening and migration of the lamp bead caused by stripping of the epoxy adhesive and the lamp bead support is favorable for improving the stability of the display screen; the problem that the lamp beads fail due to the fact that the lamp bead epoxy glue is stripped in the use process of the client is effectively intercepted.
Preferably, the experimental scheme of the severe reliability comprises a high-low temperature cycle experiment of the lamp beads in a moisture absorption state, a cold and hot impact experiment in a non-lighting state, an alternating damp and hot experiment in an on-off state and experimental result detection.
Preferably, the high-low temperature cycle test comprises the following steps:
step 1.1: carrying out acoustic scanning and metallographic microscope detection on the lamp beads and recording;
step 1.2: adjusting the low temperature box of the cold and hot impact experiment box to TA, putting the lamp beads, and keeping for 30min;
step 1.3: heating to TB at a certain rate, maintaining for 30min, cooling to TA, and maintaining for 30min;
step 1.4: continuing the step 1.3 until the experiment is continued for 2-4d.
Preferably, in the step 1.2, the low temperature box of the cold and hot impact experiment box is adjusted to-40 ℃, and the lamp beads are placed and kept for 30min.
Preferably, in step 1.3, the temperature is raised to 80 ℃ within (3 h + -30 min) and the relative humidity in the box is 90% RH, the temperature is kept for 30min, and then the temperature is lowered to-40 ℃ within (3 h + -30 min) and the temperature is kept for 30min.
Preferably, the cold and hot impact test comprises the following steps:
step 2.1: the high temperature box of the cold and hot impact experiment box is adjusted to be T C Then the lamp beads after the high-low temperature circulation experiment is finished are at t 1 Transfer into a high temperature box in time, T C Impact at temperature for 30min;
step 2.2: the lamp beads are at t 1 Transfer from the hot box into the cold box within a period of time, T A Impact at temperature for 30min, this is one cycle;
step 2.3: and taking out the lamp beads after the experiment is carried out for 50-150 cycles.
Preferably, in the step 2.1, the high temperature box of the cold and hot impact experiment box is adjusted to 125 ℃, and then the lamp beads after the high and low temperature cycle experiment are transferred into the high temperature box within 15s, and impact is carried out for 30min at the temperature of 125 ℃.
Preferably, the beads are transferred from the hot box to the cold box in step 2.2 in 15s, and are impacted for 30min at-40 ℃, which is a cycle.
Preferably, the alternating damp-heat experiment comprises the following steps:
step 3.1: placing the lamp beads after the cold and hot impact experiment is finished into a constant-temperature blast drying oven for drying treatment;
step 3.2: placing the dried lamp beads into a programmable constant temperature and humidity box in an on-off state, adjusting the environment in the box to be a standard atmospheric environment, and raising the humidity to 85% after the lamp beads are stabilized, wherein the temperature is kept unchanged;
step 3.3: heating to 55deg.C within (2 h + -30 min), keeping the temperature at 55deg.C for 3h under the condition that the humidity is not less than 90% in the heating process;
step 3.4: cooling to-20deg.C within 8h + -30 min, and cooling to 25deg.C with humidity not lower than 85%;
step 3.5: heating to 55deg.C within (8 h+ -30 min), keeping the temperature at 25deg.C to 55deg.C with humidity not lower than 90%, and keeping the temperature at 55deg.C with humidity not lower than 90% for 3h;
step 3.6: and continuing the steps 3.4 and 3.5 until the experiment is continued for 18-25 days, and taking out the lamp beads.
Preferably, the test result detection adopts an ultrasonic scanning microscope and a metallographic microscope to carry out acoustic scanning, analysis and grading on the lamp beads after the alternating damp-heat test is finished.
According to the experiment, the adaptability of the lamp beads and materials to use and store when the surfaces of the lamp beads are exposed is determined by simulating the environment of a tropical rain forest; the change of the characteristics of the lamp beads and the failure problem caused by the difference of the thermal expansion coefficients of the dissimilar materials constituting the components are confirmed by rapidly and alternately exposing the lamp beads to the test environment of ultra-high temperature and ultra-low temperature.
The beneficial effects are that:
the technical scheme of the invention has the following beneficial effects:
(1) The reliability experiment scheme can verify that the failure risk of lamp bead death, blackening and migration of the lamp bead caused by stripping of the epoxy adhesive and the lamp bead support is favorable for improving the stability of the display screen; the problem that the lamp beads fail due to the fact that the lamp bead epoxy glue is stripped in the use process of the client is effectively intercepted.
(2) The adaptability of the lamp beads and materials to use and store when the surfaces of the lamp beads are condensed is determined by simulating the environment of a tropical rain forest; the change of the characteristics of the lamp beads and the failure problem caused by the difference of the thermal expansion coefficients of the dissimilar materials constituting the components are confirmed by rapidly and alternately exposing the lamp beads to the test environment of ultra-high temperature and ultra-low temperature.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some examples of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is an initial ultrasound scanning microscope examination of the present invention;
FIG. 2 is an ultrasonic scanning microscope test chart after the experiment of the present invention;
FIG. 3 is an initial metallographic microscope examination of the present invention;
FIG. 4 is a metallographic microscope examination of the invention after experiments.
In the figure:
1-epoxy glue; 2-bracket.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the examples of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, based on the embodiments of the invention, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the invention. Thus, the following detailed description of the embodiments of the invention, provided in the examples, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, based on the embodiments of the invention, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the invention.
A method for verifying that an outdoor bead epoxy is stripped from a stent uses a rigorous reliability protocol to test an outdoor bead and detect lamp death, stent blackening and migration.
The reliability experiment scheme can verify that the failure risk of lamp bead death, blackening and migration of the lamp bead caused by stripping of the epoxy adhesive and the lamp bead support is favorable for improving the stability of the display screen; the problem that the lamp beads fail due to the fact that the lamp bead epoxy glue is stripped in the use process of the client is effectively intercepted.
As a preferred embodiment, the severe reliability test scheme includes a high and low temperature cycle test of the lamp beads in a hygroscopic state, a cold and hot impact test in a non-lighted state, an alternating damp-heat test in an on-off state, and test result detection.
As a preferred embodiment, the high-low temperature cycle test comprises the steps of:
step 1.1: carrying out acoustic scanning and metallographic microscope detection on the lamp beads and recording;
step 1.2: adjusting the low temperature box of the cold and hot impact experiment box to-40 ℃, putting the lamp beads into the low temperature box, and keeping the temperature for 30min;
step 1.3: heating to 80deg.C in (3 h+ -30 min) with relative humidity of 90% RH, maintaining for 30min, cooling to-40deg.C in (3 h+ -30 min), and maintaining for 30min;
step 1.4: continuing the step 1.3 until the experiment is continued for 2-4d.
As a preferred embodiment, the cold thermal shock test comprises the steps of:
step 2.1: the high-temperature box of the cold and hot impact experiment box is adjusted to 125 ℃, and then the lamp beads after the high and low temperature circulation experiment is finished are transferred into the high-temperature box within 15s, and are impacted for 30min at the temperature of 125 ℃;
step 2.2: transferring the lamp beads from the high temperature box into the low temperature box within 15s, and impacting for 30min at the temperature of minus 40 ℃ which is one cycle;
step 2.3: and taking out the lamp beads after the experiment is carried out for 50-150 cycles.
As a preferred embodiment, the alternating damp-heat experiment comprises the following steps:
step 3.1: placing the lamp beads after the cold and hot impact experiment is finished into a constant-temperature blast drying oven for drying treatment;
step 3.2: placing the dried lamp beads into a programmable constant temperature and humidity box in an on-off state, adjusting the environment in the box to be a standard atmospheric environment, and raising the humidity to 85% after the lamp beads are stabilized, wherein the temperature is kept unchanged;
step 3.3: heating to 55deg.C within (2 h + -30 min), keeping the temperature at 55deg.C for 3h under the condition that the humidity is not less than 90% in the heating process;
step 3.4: cooling to-20deg.C within 8h + -30 min, and cooling to 25deg.C with humidity not lower than 85%;
step 3.5: heating to 55deg.C within (8 h+ -30 min), keeping the temperature at 25deg.C to 55deg.C with humidity not lower than 90%, and keeping the temperature at 55deg.C with humidity not lower than 90% for 3h;
step 3.6: and continuing the steps 3.4 and 3.5 until the experiment is continued for 18-25 days, and taking out the lamp beads.
As a preferred embodiment, the test result detection adopts an ultrasonic scanning microscope and a metallographic microscope to carry out acoustic scanning, analysis and grading on the lamp beads after the alternating damp-heat test is finished.
According to the experiment, the adaptability of the lamp beads and materials to use and store when the surfaces of the lamp beads are exposed is determined by simulating the environment of a tropical rain forest; the change of the characteristics of the lamp beads and the failure problem caused by the difference of the thermal expansion coefficients of the dissimilar materials constituting the components are confirmed by rapidly and alternately exposing the lamp beads to the test environment of ultra-high temperature and ultra-low temperature.
The following further describes, by way of example, the beneficial effects of the experimental method for verifying the peeling of the outdoor bead epoxy adhesive and the bracket according to the present embodiment.
Embodiment one:
the embodiment is a high-low temperature cycle experiment, comprising the following steps:
step 1: carrying out acoustic scanning and metallographic microscope detection on 20 LED lamp beads with the same specification and recording;
step 2: adjusting the low temperature box of the cold and hot impact experiment box to-40 ℃, putting the lamp beads into the low temperature box, and keeping the temperature for 30min;
step 3: heating to 80deg.C in (3 h+ -30 min) with relative humidity of 90% RH, maintaining for 30min, cooling to-40deg.C in (3 h+ -30 min), and maintaining for 30min;
step 4: continuing the step 3 to the experiment for 3d.
Embodiment two:
the embodiment is a cold and hot impact experiment, comprising the following steps:
step 1: the high-temperature box of the cold and hot impact experiment box is adjusted to 125 ℃, and then the lamp beads after the high and low temperature circulation experiment in the first embodiment are transferred into the high-temperature box within 15s, and impact is carried out for 30min at the temperature of 125 ℃;
step 2: transferring the lamp beads from the high temperature box into the low temperature box within 15s, and impacting for 30min at the temperature of minus 40 ℃ which is one cycle;
step 3: after 100 cycles of the experiment, the beads were removed.
Embodiment III:
the embodiment is an alternating damp-heat experiment, comprising the following steps:
step 1: placing the lamp beads after the cold thermal shock experiment in the second embodiment into a constant temperature blast drying oven for drying treatment;
step 2: placing the dried lamp beads into a programmable constant temperature and humidity box in an on-off state, adjusting the environment in the box to be a standard atmospheric environment, and raising the humidity to 85% after the lamp beads are stabilized, wherein the temperature is kept unchanged;
step 3: heating to 55deg.C within (2 h + -30 min), keeping the temperature at 55deg.C for 3h under the condition that the humidity is not less than 90% in the heating process;
step 4: cooling to-20deg.C within 8h + -30 min, and cooling to 25deg.C with humidity not lower than 85%;
step 5: heating to 55deg.C within (8 h+ -30 min), keeping the temperature at 25deg.C to 55deg.C with humidity not lower than 90%, and keeping the temperature at 55deg.C with humidity not lower than 90% for 3h;
step 6: and continuing the steps 4 and 5 until the experiment is continuously carried out (21d+12h), and taking out the lamp beads. And detecting the lamp beads by adopting an ultrasonic scanning microscope and a metallographic microscope.
By carrying out ultrasonic scanning microscope detection on the LED lamp beads before and after the experiment, the LED lamp beads before the experiment are known to have no obvious problem in the figure 1, and the LED lamp beads after the experiment are known to have serious layering in the figure 2, namely the layering between epoxy glue and PPA in the LED lamp beads; through carrying out metallographic microscope detection to the LED lamp pearl around the experiment, can know from fig. 3 promptly that the epoxy of LED lamp pearl before the experiment is glued and is closely connected between the support, and can know from fig. 4 that the epoxy of LED lamp pearl after the experiment is glued and is peeled off each other between the support, and the LED lamp pearl outward appearance change before the experiment of recombination is known, and blackening, migration appear in the support of LED lamp pearl after the experiment. The verification method provided by the invention can verify the failure risk of lamp bead dead lamp, support blackening and migration caused by stripping of the epoxy adhesive and the lamp bead support, and is beneficial to improving the stability of the display screen; the problem that the lamp beads fail due to the fact that the lamp bead epoxy glue is stripped in the use process of the client is effectively intercepted.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, and various modifications and variations may be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (2)
1. The method for verifying the peeling of the outdoor lamp bead epoxy adhesive and the bracket is characterized in that a severe reliability experiment scheme is utilized for carrying out experiments on the outdoor lamp bead and detecting the lamp death, the blackening and the migration of the lamp bead;
the experimental scheme of the severe reliability comprises a high-low temperature circulation experiment of the lamp beads in a moisture absorption state, a cold-hot impact experiment in a non-lighting state, an alternating damp-heat experiment in an on-off state and experimental result detection;
the alternating damp-heat experiment comprises the following steps: step 3.1: placing the lamp beads after the cold and hot impact experiment is finished into a constant-temperature blast drying oven for drying treatment;
step 3.2: placing the dried lamp beads into a programmable constant temperature and humidity box in an on-off state, adjusting the environment in the box to be a standard atmospheric environment, and raising the humidity to 85% after the lamp beads are stabilized, wherein the temperature is kept unchanged;
step 3.3: heating to 55deg.C within (2 h + -30 min), keeping the temperature at 55deg.C for 3h under the condition that the humidity is not less than 90% in the heating process;
step 3.4: cooling to-20deg.C within 8h + -30 min, and cooling to 25deg.C with humidity not lower than 85%;
step 3.5: heating to 55deg.C within (8 h+ -30 min), keeping the temperature at 25deg.C to 55deg.C with humidity not lower than 90%, and keeping the temperature at 55deg.C with humidity not lower than 90% for 3h;
step 3.6: continuing to perform the steps 3.4 and 3.5 until the experiment is continuously performed for 18-25 days, and taking out the lamp beads;
the high-low temperature cycle experiment comprises the following steps: step 1.1: carrying out acoustic scanning and metallographic microscope detection on the lamp beads and recording;
step 1.2: adjusting the low temperature box of the cold and hot impact experiment box to TA, putting the lamp beads, and keeping for 30min;
step 1.3: heating to TB at a certain rate, maintaining for 30min, cooling to TA, and maintaining for 30min;
step 1.4: continuing the step 1.3 until the experiment is continuously carried out for 2-4d;
the low-temperature box of the cold and hot impact experiment box is adjusted to-40 ℃ in the step 1.2, and the lamp beads are put in and kept for 30min;
in the step 1.3, the temperature is raised to 80 ℃ in (3 h plus or minus 30 min), the relative humidity in the box is 90% RH, the temperature is kept for 30min, and then the temperature is lowered to-40 ℃ in (3 h plus or minus 30 min), and the temperature is kept for 30min;
the cold and hot impact experiment comprises the following steps: step 2.1: adjusting a high-temperature box of the cold and hot impact experiment box to TC, transferring the lamp beads after the high and low temperature circulation experiment is finished into the high-temperature box within t1 time, and impacting for 30 minutes at the TC temperature;
step 2.2: transferring the lamp beads from the high-temperature box into the low-temperature box within t1, and impacting for 30min at the temperature TA, wherein the process is one cycle;
step 2.3: after the experiment is carried out for 50-150 cycles, the lamp beads are taken out;
step 2.1, adjusting a high-temperature box of the cold and hot impact experiment box to 125 ℃, transferring the lamp beads after the high-low temperature cycle experiment is finished into the high-temperature box within 15s, and impacting for 30min at 125 ℃;
in step 2.2, the beads were transferred from the hot box to the cold box within 15s, and impacted for 30min at-40℃in one cycle.
2. The method for verifying the peeling of the outdoor lamp bead epoxy adhesive and the bracket according to claim 1, wherein the test result detection adopts an ultrasonic scanning microscope and a metallographic microscope to perform acoustic scanning, analysis and grading on the lamp beads after the alternating damp-heat test is finished.
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| CN108803518A (en) * | 2018-06-22 | 2018-11-13 | 苏州和必尔斯电子科技有限公司 | A kind of manufacture products detection system for electronics technology |
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2021
- 2021-05-21 CN CN202110559915.6A patent/CN113295603B/en active Active
Patent Citations (5)
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|---|---|---|---|---|
| CN102043097A (en) * | 2010-10-13 | 2011-05-04 | 朱建瑞 | High-pressure steam constant humid heat test of ceramic capacitor |
| EP2682738A1 (en) * | 2012-07-05 | 2014-01-08 | Atlas Material Testing Technology GmbH | Detection of the emission radiation of a UV light emitting diode using a UV light receiving diode of the same design |
| CN105385117A (en) * | 2015-10-27 | 2016-03-09 | 横店集团得邦工程塑料有限公司 | High-/low-temperature-impact-resistance-enhanced flame-retardant PBT (Polybutylene Terephthalate) composite material for LED (Light Emitting Diode) aluminum-plastic structural parts and preparation method for PBT composite material |
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