CN-121977999-A - Method and device for detecting surface drying time of structural adhesive

CN121977999ACN 121977999 ACN121977999 ACN 121977999ACN-121977999-A

Abstract

The invention discloses a method and a device for detecting the surface drying time of structural adhesive. The detection method comprises the steps of preparing a structural adhesive sample, starting timing after the structural adhesive sample is prepared, standing the prepared structural adhesive sample under standard environmental conditions, placing the structural adhesive sample on a sample preparation jig and moving the structural adhesive sample to a preset position so that the end part of a detection rod is contacted with the surface of a glue layer of the structural adhesive sample, controlling a driving device to drive the sample preparation jig to move downwards so that the end part of the detection rod is separated from the surface of the structural adhesive sample, forming a wiredrawing phenomenon, measuring the wiredrawing length of the structural adhesive sample in the wiredrawing phenomenon, and determining the surface drying time of the structural adhesive based on the comparison result of the wiredrawing length and the preset wiredrawing standard length. In the invention, a standardized test flow is established through standardized standing, contact, separation and measurement steps, so that random errors caused by manual operation in a manual contact wire drawing method are effectively eliminated.

Inventors

HUANG SHILIN
LIN ZHICHENG
CHEN TIANMING

Assignees

福建时代星云科技有限公司

Dates

Publication Date: 20260505
Application Date: 20251215

Claims (10)

1. The method for detecting the surface drying time of the structural adhesive is characterized by comprising the following steps of: s1, preparing a structural adhesive sample and starting timing after the structural adhesive sample is prepared; s2, standing the prepared structural adhesive sample under standard environmental conditions; S3, placing the structural adhesive sample on a sample preparation jig and moving to a preset position so that the end part of the detection rod is contacted with the surface of the adhesive layer of the structural adhesive sample; S4, controlling a driving device to drive the sample preparation jig to move downwards so as to separate the end part of the detection rod from the surface of the structural adhesive sample, thereby forming a wiredrawing phenomenon; S5, measuring the wire drawing length of the structural adhesive sample in the wire drawing process; S6, determining the surface drying time of the structural adhesive based on a comparison result of the wiredrawing length and a preset wiredrawing standard length.
2. The method according to claim 1, wherein in step S3, the structural adhesive specimen is placed at a preset position so that an end of the inspection rod contacts a surface of the adhesive layer of the structural adhesive specimen, including: Placing the structural adhesive sample on a sample preparation jig; And moving the sample preparation jig to a preset height so that the end part of the detection rod contacts the surface of the adhesive layer of the structural adhesive sample.
3. The method according to claim 1, wherein in step S4, the controlling the driving device to drive the sample preparation fixture to move downward comprises: determining a constant rate of downward movement of the sample preparation jig; and moving the sample preparation jig downwards at a constant rate.
4. The method according to claim 1, characterized in that in step S6, it comprises the steps of: Comparing the wire drawing length with a preset wire drawing standard length; If the wiredrawing length is smaller than or equal to the wiredrawing standard length, determining the time elapsed from the starting of the timing of the step S1 to the time as the surface drying time of the structural adhesive sample; And if the wire drawing length is greater than the wire drawing standard length, repeating the steps S3 to S5 until the wire drawing length is less than or equal to the wire drawing standard length, and determining the time elapsed from the beginning of the step S1 to the moment as the surface drying time of the structural adhesive sample.
5. The detection device for the surface drying time of the structural adhesive is characterized by comprising a base, a driving device, a sample preparation jig and a detection piece, wherein the driving device comprises a driving motor and a transmission mechanism, the driving motor is arranged on the base and is in transmission connection with the transmission mechanism, the sample preparation jig is arranged on the transmission mechanism and is movably arranged in the vertical height direction through the transmission mechanism, the sample preparation jig is used for containing structural adhesive to be detected, the detection piece is arranged on the base, and the detection piece comprises a detection rod, and the detection rod is positioned above the vertical height direction of the sample preparation jig.
6. The detecting device according to claim 5, wherein the transmission mechanism comprises an X-shaped lifting support, a first cross rod, a second cross rod, a transmission assembly and a lifting table for placing the sample preparation jig, the front end of the bottom of the X-shaped lifting support is hinged on the base through the first cross rod, the rear end of the bottom of the X-shaped lifting support is hinged on the base through the second cross rod, the second cross rod is slidably arranged on the base through the transmission assembly, the top of the X-shaped lifting support is connected with the bottom of the lifting table, the transmission assembly is arranged on the base, and the driving motor is in transmission connection with the X-shaped lifting mechanism through the transmission assembly.
7. The detecting device for detecting the rotation of a motor in a motor vehicle according to claim 6, wherein the transmission assembly further comprises a slider and a screw rod, the screw rod is in transmission connection with the output shaft of the driving motor, the screw rod is rotatably arranged on the base along a rod shaft of the screw rod, the slider is connected with the second cross rod, the slider is sleeved on the screw rod and is in threaded connection with the screw rod, so that the slider can move back and forth along the axis direction of the screw rod, and the second cross rod is driven to move back and forth along the axis direction of the screw rod.
8. The detecting device for detecting the rotation of a motor rotor as claimed in claim 7, wherein the base further includes a base plate and a stopper provided on the base plate and connected to an end of the screw shaft remote from the driving motor.
9. The detecting device according to claim 6, wherein the detecting member further comprises a supporting rod and a connecting rod, one end of the supporting rod is fixed on the base, the other end of the supporting rod is connected with one end of the connecting rod, the connecting rod extends in the horizontal direction, and the other end of the connecting rod is connected with the detecting rod.
10. The detection device of claim 9, further comprising a stop member disposed on the lift table and detachably abutting the connecting rod.

Description

Method and device for detecting surface drying time of structural adhesive Technical Field The invention relates to the technical field of structural adhesives, in particular to a method and a device for detecting the surface drying time of a structural adhesive. Background In the field of batteries, structural adhesive (such as bi-component polyurethane structural adhesive) is a key packaging material in a battery cell PACK of a new energy battery, and has the main functions of realizing the bonding and fixing between a module and a PACK box body and providing necessary heat conduction, heat dissipation and insulation protection. The bonding effect of the material is directly related to the structural stability, safety and reliability of the whole battery pack. The surface drying time is a critical technological parameter, and not only directly affects the operable time of production, but also is closely related to the final bonding strength after curing. Therefore, accurate and reliable monitoring of the surface drying time is an important link for guaranteeing the product quality. At present, the conventional manual contact wire drawing method is generally adopted for testing the surface drying time of polyurethane structural adhesive in the industry. The method mainly relies on an experimenter to hold an experimental rod (such as a glass rod or a metal rod) for manual operation, and the specific process is that the experimental rod is manually lifted upwards after being contacted with the surface of a glue sample, and the surface dry state of the experimental rod is judged by observing whether the surface of the glue sample is drawn or not and the length of the drawn wire. However, this manually operated test method has significant inherent drawbacks, resulting in poor consistency and reproducibility of test results, mainly manifested in the following aspects: (1) The contact angle is difficult to unify, the contact angle of an experimenter when holding an experimental rod and the surface of a glue sample is not guaranteed to be consistent every time, and different contact angles can directly influence the length of wire drawing and introduce human errors. (2) The thickness of the deep glue layer is uncontrollable, and the thickness of the experimental rod deep into the glue layer is difficult to accurately control by manual operation. The states of the surface layer of the adhesive layer and the inside of the adhesive layer under different standing time are different, so that sampling points are not uniform, and the test result cannot truly reflect the whole surface drying process. (3) The upward speed fluctuation is large, and the upward speed of the experimental rod has a decisive influence on the formation and the length of the wiredrawing phenomenon. The rate of manual lifting cannot be kept constant and there is a large fluctuation between different operators or different times of operation by the same operator, which severely affects the comparability of the test data. In summary, the existing manual contact wire drawing method is limited by many human factors, the standardization degree of the testing process is low, so that the fluctuation of the surface dry time testing data of incoming materials in different batches is large, and accurate and reliable criteria cannot be provided for incoming material inspection and production process investigation. This may not only erroneously release reject, increase product quality risk, but may also lead to reject material being misjudged, causing wastage. Disclosure of Invention The invention aims to solve the technical problem of providing a method and a device for detecting the surface drying time of structural adhesive, so as to solve the problem of inaccurate detection results caused by manual operation in a manual contact wire drawing method. In order to solve the technical problems, the technical scheme adopted by the invention is that the method for detecting the surface drying time of the structural adhesive comprises the following steps: s1, preparing a structural adhesive sample and starting timing after the structural adhesive sample is prepared; s2, standing the prepared structural adhesive sample under standard environmental conditions; S3, placing the structural adhesive sample on a sample preparation jig and moving to a preset position so that the end part of the detection rod is contacted with the surface of the adhesive layer of the structural adhesive sample; S4, controlling a driving device to drive the sample preparation jig to move downwards so as to separate the end part of the detection rod from the surface of the structural adhesive sample, thereby forming a wiredrawing phenomenon; S5, measuring the wire drawing length of the structural adhesive sample in the wire drawing process; S6, determining the surface drying time of the structural adhesive based on a comparison result of the wiredrawing length and a preset wiredrawing stand