Testing Device and Testing Method for Adhesive Fluidity

Abstract

The present invention relates to a test device and a test method for the fluidity of an adhesive, belonging to the technical field of adhesive performance testing. A test device for the fluidity of an adhesive includes: a container for adding the adhesive to be tested; a stirring motor for providing the power for stirring; a test hollow tube, the upper end of which is fixedly connected to the output end of the stirring motor, and the axis of which overlaps with the rotation axis of the output end, and the test hollow tube is vertically inserted into the adhesive to be tested; a timing unit for calculating the climbing time; and a height measuring unit for measuring the climbing height. The present invention also provides a test method for the fluidity of an adhesive. When the adhesive to be tested is stirred by the test hollow tube, due to the viscous shear stress between the liquid of the adhesive itself and the contact surface, the adhesive will exhibit the phenomenon of rod climbing, causing the liquid level inside the test hollow tube to be higher than the liquid level of the container. The tester can quantitatively characterize the fluidity of the adhesive by measuring with the timing unit and the height measuring unit.

Description

Technical Field

[0001] The present invention belongs to the technical field of adhesive performance testing, and particularly relates to a testing device and a testing method for the fluidity of adhesives. Background Art

[0002] Bonding (adhering, gluing, cementing, sticking) refers to the technology of connecting the surfaces of homogeneous or heterogeneous objects with adhesives, which has the characteristics of continuous stress distribution, light weight, or sealing, and most process temperatures are low. Bonding is particularly suitable for connecting different materials, different thicknesses, ultra-thin specifications, and complex components. Bonding has developed the fastest in modern times, has a very wide range of application industries, and has a significant impact on the progress of high-tech science and technology and the improvement of people's daily lives. A class of organic or inorganic, natural or synthetic substances that can connect the same kind, two or more homogeneous or heterogeneous workpieces (or materials) together and have sufficient strength after curing are collectively called adhesives or bonding agents. The fluidity of adhesives has a crucial impact on the bonding quality between objects. Poor fluidity of adhesives will cause insufficient filling of adhesives during the bonding process, affecting the bonding strength.

[0003] At present, there are two forms of testing methods for the fluidity of adhesives. One is to measure through professional instruments such as rheometers and viscometers; the other is to judge by the feeling method of manual stirring. However, the rheometer in the former is expensive and requires a large investment, and the rheological parameters are relatively difficult for engineers at the application level to understand (usually used by academic researchers in fluid mechanics to characterize this parameter), with a high usage threshold, and the viscometer measures only a single viscosity index and cannot accurately reflect the actual application performance. For Newtonian fluids, non-Newtonian fluids, or fluids between the two, the viscometer cannot accurately measure the fluidity or the flow state of the glue. For example: Two samples to be tested with exactly the same viscosity may feel completely different in actual use. And the latter's manual stirring feeling method is too subjective to be quantified, and is affected by factors such as testers, testing environments, containers, and stirring tools, and cannot fully and truly reflect the application performance. Summary of the Invention

[0004] In order to overcome the problems existing in the above-mentioned prior art, the purpose of the present invention is to provide a testing device and a testing method for the fluidity of adhesives to solve the problems proposed in the above background art.

[0005] To solve the above technical problems, the present invention adopts the following technical solutions to be realized:

[0006] A testing device for the fluidity of an adhesive, comprising: a container for adding the adhesive to be tested; a stirring motor for providing the power for stirring; a testing hollow tube, the upper end of the testing hollow tube is fixedly connected to the output end of the stirring motor, the axis of the testing hollow tube overlaps with the rotation axis of the output end, and the testing hollow tube is vertically inserted into the adhesive to be tested in the container; a timing unit for calculating the time for the adhesive to climb in the testing hollow tube; a height measuring unit for measuring the climbing height of the adhesive to be tested in the testing hollow tube.

[0007] Preferably, the technical solution of the present invention further comprises a support frame, one end of the support frame is fixedly connected to the upper end of the stirring motor, and the other end of the support frame is fixedly connected to one end of the testing hollow tube.

[0008] Preferably, the technical solution of the present invention is that the testing hollow tube is a transparent glass tube, and a scale is provided on the outer wall of the testing hollow tube.

[0009] Preferably, the technical solution of the present invention further comprises a control circuit board; the control circuit board is electrically connected to the stirring motor and the timing unit.

[0010] Preferably, the technical solution of the present invention is that the container is further provided with a temperature control unit for setting and controlling the test temperature of the adhesive to be tested.

[0011] The present invention also provides a testing method for the fluidity of an adhesive, which comprises the following steps:

[0012] S00: Add the adhesive to be tested into the container;

[0013] S10: Fix the upper end of the testing hollow tube to the output end of the stirring motor, make the axis of the testing hollow tube overlap with the rotation axis of the output end, and vertically insert the testing hollow tube into the adhesive to be tested;

[0014] S20: Use the stirring motor to drive the testing hollow tube to uniformly stir the adhesive to be tested;

[0015] S30: Stir the testing hollow tube for a certain stirring time at a certain test temperature and a certain stirring speed;

[0016] S40: The fluidity of the adhesive to be tested can be quantitatively characterized according to the climbing height of the adhesive to be tested rising from the liquid level in the testing hollow tube.

[0017] Preferably, the technical solution of the present invention is that the distance from the outer wall of the testing hollow tube in each direction to the inner wall of the container in each direction is greater than or equal to 5 times the diameter of the testing hollow tube.

[0018] Preferably, in the technical solution of the present invention, the liquid level height of the adhesive to be measured is greater than or equal to 50 mm, and the insertion depth of the test hollow tube into the liquid level of the adhesive to be measured is 20 - 30 mm.

[0019] Preferably, in the technical solution of the present invention, the test temperature is 25 - 35 °C, the stirring speed is 1000 - 2000 rpm, and the stirring time is 20 - 45 s.

[0020] The beneficial effects of the present invention are:

[0021] The present invention provides a test device and a test method for the fluidity of an adhesive. When the test hollow tube stirs the adhesive to be measured, due to the viscous shear stress between the liquid of the adhesive itself and the contact surface, the adhesive will exhibit the rod climbing phenomenon. During the stirring process, the adhesive to be measured will climb along the inside of the test hollow tube, causing the liquid level inside the test hollow tube to be higher than the liquid level of the container. The tester can measure the climbing height of the adhesive within a certain time through a timer to quantitatively characterize the fluidity of the adhesive. The higher the climbing height of the liquid level, the worse the fluidity of the adhesive to be measured; conversely, the better.

[0022] The test device and method are simple, low-cost, and have low requirements for the qualifications of operators. Personnel with a high school or secondary vocational school education can quickly master the usage method through training. The measured indicators can be intuitively quantified. Combining application experience, it can be directly determined whether the product meets the requirements of users, improving the drawbacks of the past subjective judgment using adjectives or adverbs such as "good", "general", and "bad". At the same time, the measurement time is short, and it can complete the detection and equipment cleaning of a product in 3 - 5 minutes, effectively improving the detection speed. Traditionally, whether the fluidity of the adhesive is appropriate in the factory is subjectively judged by the operator based on the brushing feel of the adhesive and whether the adhesive drags filaments during brushing. This test device can digitalize the abstract text description and subjective judgment method, making it more objective, specific, and accurate, and not affected by the subjective factors of different operators. Description of the Drawings

[0023] 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, without creative efforts, other drawings can also be obtained based on these drawings.

[0024] Figure 1 It is a schematic diagram of the use state of a test device for the fluidity of an adhesive according to the present invention;

[0025] Figure 2 It is a control structure block diagram of a test device for the fluidity of an adhesive according to the present invention;

[0026] Figure 3 It is a flowchart of a test method for the fluidity of an adhesive of the present invention.

[0027] In the figure:

[0028] 1 - Container; 2 - Stirring motor; 21 - Output end; 3 - Test hollow tube; 4 - Base; 5 - Support frame; 6 - Timing unit; 7 - Control circuit board; 8 - Temperature control unit; 9 - Adhesive to be tested; A - Tube axis; B - Rotation axis. Detailed implementation manners

[0029] For a clearer understanding of the technical features, objectives, and beneficial effects of the present invention, the technical solution of the present invention will be described in detail below, but it should not be construed as a limitation on the scope of implementation of the present invention.

[0030] Such as Figure 1-2As shown in the figure, a test device for the fluidity of an adhesive provided in this embodiment includes: a container 1 for adding the adhesive 9 to be tested; a stirring motor 2 for providing the power for stirring; a test hollow tube 3, the upper end of the test hollow tube 3 is fixedly connected to the output end 21 of the stirring motor 2, the central axis A of the test hollow tube 3 coincides with the rotation axis B of the output end 21, and the test hollow tube 3 is vertically inserted into the adhesive 9 to be tested in the container 1 for the adhesive 9 to be tested to climb inside the tube during the stirring of the stirring motor 2; a timing unit 6 for calculating the time for the adhesive 9 to be tested to climb inside the test hollow tube 3, and there is a display screen for displaying the time in the timing unit 6; a height measurement unit for measuring the climbing height H of the adhesive to be tested inside the test hollow tube. Specifically, the test device of this embodiment is also provided with a base 4, the container 1 is placed on the base 4, and the base 4 is also provided with a support frame 5 for connecting each unit. One end of the support frame 5 is fixedly connected to the upper end of the stirring motor 2, and the other end of the support frame 5 is fixedly connected to one end of the timing unit 6. During the test, the stirring motor 2 drives the test hollow tube 3 to rotate, and the test hollow tube 3 further stirs the adhesive 9 to be tested. Due to the viscous shear stress between the liquid of the adhesive itself and the contact surface, the adhesive will exhibit the rod climbing phenomenon. The adhesive 9 to be tested will climb along the inside of the test hollow tube 3 during the stirring of the test hollow tube 3, making the liquid level inside the test hollow tube 3 higher than the liquid level of the container 1, and the height difference of the excess liquid level is the climbing height H. The tester can quantitatively characterize the fluidity of the adhesive by measuring the climbing height H of the adhesive within a certain time through the timing unit (tools such as a timer or a watch can be used for measurement) and the height measurement unit (simple tools such as a caliper or a ruler can be used for measurement, or a precision instrument similar to a grating ruler can also be used for measurement). The higher the climbing height H of the liquid level, the worse the fluidity of the adhesive 9 to be tested; on the contrary, the better. This test device has a simple structure, low device cost, and low requirements for the qualifications of operators. Personnel with a high school or secondary vocational school education can quickly master the usage method through training. The measured indicators can be intuitively quantified. Combining application experience, it can intuitively determine whether the product meets the requirements of users. It improves the disadvantages of the past subjective judgment such as "good, average, bad", etc. At the same time, the measurement time is short, and the detection and equipment cleaning of one product can be completed in 3 - 5 minutes, which can effectively improve the detection speed. Traditionally, whether the fluidity of the adhesive is appropriate in the factory is judged subjectively by the operator's feeling such as the brushing feel of the adhesive and whether the adhesive drags filaments during brushing. This test device can digitalize the abstract text description and subjective judgment method, making it more objective, specific, and accurate, and not affected by the subjective factors of different operators.

[0031] For the convenience of users to observe the structure of the test, preferably, the test hollow tube 3 in this embodiment is a transparent glass tube, and a scale is provided on the outer wall of the test hollow tube 3. The setting of the scale is equivalent to replacing the height measurement unit. Moreover, glass tubes are relatively common and easy to obtain, with good acid and alkali resistance, solvent resistance, moderate specific surface energy, convenient operation, and can simply and quickly measure and read data. Plastic tubes and metal tubes are not easy to obtain, are prone to deformation, are not solvent-resistant or acid-alkali corrosion-resistant, and plastic tubes have good compatibility and affinity with most organic substances, which will theoretically affect the test result deviation.

[0032] For the convenience of testers to time, preferably, a control circuit board 7 is further included; the control circuit board 7 is electrically connected to the stirring motor 2, the control circuit board 7 is electrically connected to the timing unit 6, and the timing unit 6 uses an automatic timer. When the tester starts the stirring motor 2, the automatic timer is simultaneously turned on through the control circuit board 7 to start timing, providing convenience and accuracy for the test.

[0033] To further ensure the stability of test data and adapt to the flow characteristics of different adhesives, preferably, the container 1 is further provided with a temperature control unit 8 for setting and controlling the test temperature of the adhesive 9 to be tested. In this embodiment, the temperature control unit 8 is a heating sleeve device wrapped around the outside of the container 1.

[0034] As Figure 3 shown, a method for testing the fluidity of an adhesive, using the test device as described in the above Embodiment 1, includes the following steps:

[0035] S00: Add the adhesive to be tested into the container;

[0036] S10: The upper end of the test hollow tube is fixedly connected to the output end of the stirring motor, the axis of the test hollow tube coincides with the rotation axis of the output end, and the test hollow tube is vertically inserted into the adhesive to be tested;

[0037] S20: Use the stirring motor to drive the test hollow tube to uniformly stir the adhesive to be tested;

[0038] S30: The test hollow tube stirs for a certain stirring time at a certain test temperature and a certain stirring speed;

[0039] S40: The fluidity of the adhesive to be tested can be quantitatively characterized according to the climbing height of the adhesive to be tested rising from the liquid level in the test hollow tube.

[0040] Since a large deviation will occur in the test results if the outer wall of the test hollow tube is too close to the inner wall of the container, preferably, the distance from the outer wall of the test hollow tube to the inner wall of the container is greater than or equal to 5 times the diameter of the test hollow tube. In this embodiment, the diameter of the test hollow tube is 5 mm, which is located in the middle of the container. The container is rectangular, with the length and width sides being 250 mm respectively and the height being 300 mm.

[0041] To make the measured data stable and reduce data fluctuations, preferably, the liquid level height of the adhesive to be tested is greater than or equal to 50 mm, and the depth of the test hollow tube inserted into the liquid level of the adhesive to be tested is 20 - 30 mm. In this embodiment, the liquid level height of the adhesive to be tested is 100 mm, and the depth of the test hollow tube inserted into the liquid level of the adhesive to be tested is 20 mm.

[0042] To further ensure the stable performance of the measured adhesive, the test temperature is 25 - 35 °C, the stirring speed is 1000 - 2000 rpm, and the stirring time is 20 - 45 s. In this embodiment, the test temperature is 30 ± 0.5 °C, the stirring speed is 1500 ± 20 rpm, and the stirring time is 30 ± 1.00 s.

[0043] This method can be applied to the measurement of the fluidity of various adhesives, and is particularly accurately applicable to polyurethane adhesives, polyester adhesives, chloroprene rubber or graft-modified chloroprene rubber adhesives, and adhesives with synthetic rubbers such as SBS or SIS and their modified products as the main components.

[0044] Adhesives vary in type, usage scenarios, and applications, and the acceptable fluidity standards are different. For example, for polyurethane adhesives used in sole combination and molding, most factories can accept adhesives with a climbing height of at most 20 mm. Generally, the ideal state is below 10 mm. When the climbing height is between 10 - 20 mm, slight wire drawing is acceptable. When it exceeds 20 mm, the wire drawing is severe, the blocking force during brushing is large, and the operator experience is very poor, affecting work efficiency. For chloroprene rubber adhesives and synthetic rubber adhesives used in the shoe upper sewing part, due to different usage methods, adhesives with a climbing height of up to 50 mm or even 80 mm do not affect operation and use. The tester can judge whether the requirements of the usage environment are met based on the test data results of the adhesive to be tested.

[0045] The above description of the embodiments is for the convenience of those of ordinary skill in the art to understand and apply the present invention. Those skilled in the art can obviously make various modifications to these embodiments easily and apply the general principles described herein to other embodiments without creative labor. Therefore, the present invention is not limited to the embodiments here, and the improvements and modifications made by those skilled in the art to the present invention should be within the protection scope of the present invention according to the disclosure of the present invention.

Claims

1. A test device for the fluidity of an adhesive, characterized in that, Comprising: A container for adding the adhesive to be tested; A stirring motor for providing the power for stirring; A test hollow tube, the upper end of the test hollow tube is fixedly connected to the output end of the stirring motor, the axis of the test hollow tube overlaps with the rotation axis of the output end, and the test hollow tube is vertically inserted into the adhesive to be tested in the container; A timing unit for calculating the time for the adhesive to be tested to climb in the test hollow tube; A height measurement unit for measuring the climbing height of the adhesive to be tested in the test hollow tube; The distance from the outer wall of the test hollow tube in each direction to the inner wall of the container in each direction is greater than or equal to 5 times the diameter of the test hollow tube.

2. The test device according to claim 1, wherein: It further comprises a support frame; One end of the support frame is fixedly connected to the upper end of the stirring motor, and the other end of the support frame is fixedly connected to one end of the timing unit.

3. The test device according to claim 1, wherein: The test hollow tube is a transparent glass tube, and a scale is provided on the outer wall of the test hollow tube.

4. The test device according to claim 1, wherein: It further comprises a control circuit board; The control circuit board is electrically connected to the stirring motor, and the control circuit board is electrically connected to the timing unit.

5. The test device according to claim 1, wherein: The container is further provided with a temperature control unit for setting and controlling the test temperature of the adhesive to be tested.

6. A method for testing the fluidity of an adhesive, characterized in that, Including the following steps: S00: Add the adhesive to be tested into the container; S10: The upper end of the test hollow tube is fixedly connected to the output end of the stirring motor, the axis of the test hollow tube overlaps with the rotation axis of the output end, and the test hollow tube is vertically inserted into the adhesive to be tested; S20: Use the stirring motor to drive the test hollow tube to stir the adhesive to be tested evenly; S30: The test hollow tube stirs for a certain stirring time at a certain test temperature and a certain stirring speed; S40: The fluidity of the adhesive to be tested can be quantitatively characterized according to the climbing height of the adhesive to be tested rising from the liquid surface in the test hollow tube; The distance from the outer wall of the test hollow tube in each direction to the inner wall of the container in each direction is greater than or equal to 5 times the diameter of the test hollow tube.

7. The test method according to claim 6, wherein: The liquid level height of the adhesive to be tested is greater than or equal to 50 mm, and the insertion depth of the test hollow tube into the liquid surface of the adhesive to be tested is 20 - 30 mm.

8. The test method according to claim 6, wherein: The test temperature is 25 - 35 °C, the stirring speed is 1000 - 2000 rpm, and the stirring time is 20 - 45 s.

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