A high-viscosity adhesive density testing device and method

Abstract

The present invention relates to a device and method for testing the density of a high-viscosity adhesive, belonging to the field of adhesive testing. It includes a glue container assembly, a glue injection buffer assembly, a density testing assembly, and a glue overflow elimination assembly; the glue container assembly includes a glue container, a glue outlet pipe, and a pusher; the glue injection buffer assembly includes a buffer tank, a first conical channel, and a first platform; the inner wall of the buffer tank is connected to the outer wall of the glue outlet pipe; the first conical channel is arranged at the bottom of the buffer tank; the first platform is arranged at the bottom of the first conical channel; the density testing assembly includes a measuring tube, a second platform, and a third platform; the second platform is arranged at the top of the measuring tube; the third platform is arranged at the bottom of the measuring tube; the glue overflow elimination assembly includes a fourth platform; the upper and lower surfaces of the fourth platform are respectively provided with a fifth through hole and a sixth through hole; a second conical channel is arranged between the fifth through hole and the sixth through hole. The present invention can solve problems such as the adhesive not filling up and having many bubbles during the testing process with a specific gravity cup, thereby greatly improving the accuracy of the testing.

Description

Technical Field

[0001] The present invention belongs to the field of adhesive testing, and in particular relates to a device and method for testing the density of high-viscosity adhesives, which are applicable to adhesives with high viscosity or even ultra-high viscosity and cannot flow by themselves under test conditions. Background Art

[0002] As a characteristic of a substance, density is only related to the type and state of the substance, and has nothing to do with the mass and volume of the substance.

[0003] Density is one of the basic properties of a substance and is also a very important characteristic. Especially in the production process, the properties of a substance can be judged fundamentally and quickly through density detection. For example, in the production process of adhesives, inorganic fillers are sometimes added. The difference between the actual feeding weight and the theoretical feeding weight of the filler can be judged by measuring the density of the adhesive after adding the filler, so as to carry out quality control during the process. At the same time, density can also reflect the degree of uniformity of the mixing of various components in the adhesive formula.

[0004] At present, the main testing methods for the density of adhesives are the specific gravity cup method and the density bottle method. However, these two testing methods are mainly for liquid and self-flowing adhesives and are not applicable to high-viscosity and non-self-flowing adhesives. Summary of the Invention

[0005] The object of the present invention is to provide a device and method for testing the density of high-viscosity adhesives, which are applicable to the density testing of high-viscosity and non-self-flowing adhesives, and the density test results are accurate.

[0006] In order to achieve the above object, the technical solution of the present invention provides a device and method for testing the density of high-viscosity adhesives, including a glue-containing container assembly, a glue-injection buffer assembly, a density testing assembly, and an overflow discharge assembly connected in sequence;

[0007] The glue-containing container assembly includes a glue-containing container, a glue outlet pipe, and a pusher; the pusher is arranged on the inner circumference of the glue-containing container; the glue outlet pipe is arranged at the bottom of the glue-containing container;

[0008] The glue-injection buffer assembly includes a buffer tank, a first conical channel, and a first platform; the inner wall of the buffer tank is connected to the outer wall of the glue outlet pipe; the first conical channel is arranged at the bottom of the buffer tank, and the inner diameter gradually decreases from top to bottom; the first platform is arranged at the bottom of the first conical channel;

[0009] The density testing assembly includes a measuring tube, a second platform, and a third platform; the second platform is arranged at the top of the measuring tube and is connected to the first platform; the third platform is arranged at the bottom of the measuring tube;

[0010] The glue overflow elimination component includes a fourth platform; the fourth platform is connected to the third platform; concentric fifth through holes and sixth through holes are respectively provided on the upper and lower surfaces of the fourth platform; the diameter of the fifth through hole is larger than that of the sixth through hole, and a second conical channel with a gradually decreasing inner diameter from top to bottom is provided between the two.

[0011] Preferably, an exhaust hole and a glue pushing rod are provided at the top of the thruster; an exhaust hole sealing rod is connected in the exhaust hole.

[0012] Preferably, the glue container is cylindrical; a sealing ring is provided between the outer periphery of the thruster and the inner periphery of the glue container.

[0013] Preferably, the length of the glue outlet pipe is equal to the height of the buffer tank.

[0014] Preferably, the bottom of the buffer tank is annular and is provided with a first through hole; the wall thickness of the glue outlet pipe is smaller than the difference between the inner diameter of the buffer tank and the inner diameter of the first through hole.

[0015] Preferably, the measuring tube is integrally connected to the second platform and the third platform; the diameter of the measuring tube is greater than or equal to 3 mm and the length is greater than or equal to 5 cm.

[0016] Preferably, the first platform is provided with a second through hole communicating with the first conical channel; the second platform is provided with a third through hole communicating with the test tube;

[0017] The diameters of the second through hole, the third through hole, the fourth through hole and the fifth through hole are all equal;

[0018] The first platform and the second platform, and the third platform and the fourth platform are all connected by four screws.

[0019] Preferably, the measuring tube is made of a transparent material that is not easily deformed; the inner wall of the measuring tube is smooth.

[0020] Preferably, the inner wall of the buffer tank is threadedly connected to the outer wall of the glue outlet pipe.

[0021] Preferably, it includes the following steps:

[0022] Measure the mass of the density test component as m1;

[0023] Connect the first platform and the second platform;

[0024] Place a standard adhesive with a known density of ρ0 into the glue container;

[0025] Apply pressure through the glue pushing rod to extrude the standard adhesive from the glue outlet pipe;

[0026] Connect the glue container and the buffer tank; push the glue rod forward at a constant speed; scrape the standard adhesive on the lower surface of the third platform;

[0027] Connect the density test component and the overflow glue removal component; push the glue rod forward at a constant speed;

[0028] Stop the glue output; disconnect the connection between the first platform and the second platform, and between the third platform and the fourth platform; scrape the excess standard adhesive in the third through-hole and the fourth through-hole;

[0029] Weigh the mass of the density test component containing the standard adhesive as m2;

[0030] Calculate the standard volume V0 of the density test component = (m2 - m1) / ρ0;

[0031] Replace the standard adhesive with the adhesive to be tested, and measure the mass of the density test component containing the adhesive to be tested as m3 according to the above steps; obtain the mass of the adhesive to be tested as Δm = (m3 - m1);

[0032] Calculate the density ρ1 of the adhesive to be tested = Δm / V0.

[0033] In summary, the present invention includes the following beneficial technical effects:

[0034] It solves the problem that during the density test of high-viscosity adhesives at present, when the adhesive is filled into a specific gravity cup or other containers, it is impossible to ensure that the corners are completely filled with the adhesive, and air bubbles are easily generated during the transfer of the adhesive to the specific gravity cup or other containers, resulting in inaccurate density tests.

[0035] The present invention is applicable to testing the density of high-viscosity single-component or multi-component adhesives.

[0036] After the adhesive is mixed and degassed, there will be no secondary transfer in the present invention, thus avoiding the generation of air bubbles during the secondary transfer process.

[0037] During the test process of the present invention, the adhesive will not come into contact with other solvents or media, avoiding the reaction between the adhesive and the media and affecting the test accuracy.

[0038] The test of the present invention is convenient and fast, and can be applicable to testing the density of adhesives with a very short operable time. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a schematic structural diagram of the high-viscosity adhesive density test device in the present invention;

[0040] Figure 2It is a schematic structural diagram of the glue container assembly in the present invention;

[0041] Figure 3 It is a schematic structural diagram of the glue injection buffer assembly in the present invention;

[0042] Figure 4 It is a schematic structural diagram of the density test assembly in the present invention;

[0043] Figure 5 It is a schematic structural diagram of the overflow glue removal assembly in the present invention.

[0044] Reference numerals:

[0045] 1. Glue container assembly; 11. Glue container; 12. Glue outlet pipe; 13. Pusher; 131. Exhaust hole; 132. Exhaust hole sealing rod; 133. Glue pushing rod;

[0046] 2. Glue injection buffer assembly; 21. Buffer tank; 211. First through hole; 22. First platform; 221. Second through hole;

[0047] 3. Density test assembly; 31. Second platform; 311. Third through hole; 32. Measuring tube; 33. Third platform; 331. Fourth through hole;

[0048] 4. Overflow glue removal assembly; 41. Fourth platform; 411. Fifth through hole; 412. Sixth through hole. Detailed implementation manners

[0049] The following will Figure 1 be combined with the attached Figure 5 drawings to further describe the present invention in detail.

[0050] An embodiment of the present invention discloses a high-viscosity adhesive density test device, which includes a glue container assembly 1, a glue injection buffer assembly 2, a density test assembly 3, and an overflow glue removal assembly 4 that are connected in sequence.

[0051] The glue container assembly 1 includes a cylindrical glue container 11; at the center of the bottom of the glue container 11, a glue outlet pipe 12 is provided downward, and an external thread is provided on the outer wall of the glue outlet pipe 12; a disc-shaped pusher 13 is provided in the glue container 11, and a sealing ring is wrapped around the disc-shaped pusher 13 along the circumferential direction. The sealing ring makes the disc-shaped pusher 13 fit tightly with the inner wall of the glue container 11, and there will be no phenomenon of adhesive overflowing from the gap;

[0052] The top of the pusher 13 is provided with an exhaust hole 131. When the pusher 13 is installed on the glue container 11, the air in the glue container 11 can be discharged through the exhaust hole 131. The exhaust hole 131 can be threadedly connected with an exhaust hole sealing rod 132. After the air is discharged, the glue container 11 can be sealed with the exhaust hole sealing rod 132. At the center position of the top of the pusher 13, a glue pushing rod 133 is vertically connected.

[0053] The glue injection buffer assembly 2 includes a cylindrical buffer tank 21. The inner diameter of the buffer tank 21 is equal to the outer diameter of the glue outlet pipe 12 of the glue container assembly 1. And the inner wall of the cylindrical buffer tank 21 is provided with an inner concave thread that matches the external thread of the glue outlet pipe 12, which enables quick installation and disassembly.

[0054] The length of the glue outlet pipe 12 of the glue container assembly 1 is equal to the height of the cylindrical buffer tank 21 of the glue injection buffer assembly 2. In this way, even under the condition of high-pressure glue injection, it can ensure that the glue container assembly 1 and the glue injection buffer assembly 2 are firmly connected and will not become loose.

[0055] The bottom of the buffer tank 21 is in a circular ring shape, and a circular hole-shaped first through hole 211 is opened at the center position. The diameter of the first through hole 211 is smaller than the bottom diameter of the cylindrical buffer tank 21. At the same time, the wall thickness d of the glue outlet pipe 12 of the glue container assembly 1 is smaller than the difference D between the inner diameter of the buffer tank 21 and the inner diameter of the first through hole 211 (that is, the wall thickness d of the glue outlet of the glue container assembly 1 is smaller than the difference D between the inner and outer diameters of the circular ring-shaped bottom of the buffer tank 21). In this way, it can maximize the avoidance of the adhesive that is prone to generate bubbles at the inner wall of the glue container 11 and the glue outlet pipe 12 from entering the measuring pipe 32.

[0056] The glue injection buffer assembly 2 further includes a first platform 22 located directly below the buffer tank 21. A second through hole 221 is opened at the center of the first platform 22. The first through hole 211 and the second through hole 221 are connected by a channel. However, the diameter of the first through hole 211 is larger than that of the second through hole 221, so that a conical channel with a gradually decreasing inner diameter is formed between the first through hole 211 and the second through hole 221. In this way, the flow through hole of the adhesive becomes smaller from large, and the adhesive pressure becomes larger from small, making the adhesive entering the test tube more compact. At the same time, this pressurization process can extrude the bubbles that have not been completely removed from the adhesive.

[0057] The density test assembly 3 includes two second platforms 31 and third platforms 33 that are distributed up and down and are in a disc shape. The upper and lower surfaces of the second platform 31 and the third platform 33 are flat and smooth. After the second platform 31 and the third platform 33 are fastened with screws, they can be seamlessly fitted together, and no adhesive will overflow from the gap after connection.

[0058] Four screws are evenly distributed along the circular periphery of the second platform 31. These screws correspond to the four screw holes on the first platform 22 of the glue injection buffer assembly 2, and the glue injection buffer assembly 2 and the density test assembly 3 can be connected by the screws. At the same time, these four screws also play a positioning role, so that the third through hole 311 at the center of the second platform 31 of the density test assembly 3 is aligned with the second through hole 221 at the center of the first platform 22 of the glue injection buffer assembly 2, and the diameters of the second through hole 221 and the third through hole 311 are equal. The third through hole 311 is connected to a cylindrical measuring tube 32. The lower end of the measuring tube 32 is connected to the third platform 33, and there is also a circle at the center of the third platform 33 with the same size as the diameter of the measuring tube 32. The second platform 31, the third platform 33, and the measuring tube 32 are integrated.

[0059] The diameter of the measuring tube 32 should be greater than or equal to 3 mm, and the length of the measuring tube 32 should be greater than or equal to 5 cm. This can ensure that the amount of glue used for one test is not too small, resulting in large deviations, and at the same time, it will not cause waste and environmental pollution due to the consumption of a large amount of samples for one test. The inner wall of the measuring tube 32 should be smooth to reduce the friction force with the adhesive, avoid heat generation due to friction, affect the test temperature of the adhesive, and thus affect the test results.

[0060] The glue overflow elimination assembly 4 includes a cylindrical fourth platform 41. Concentric fifth through hole 411 and sixth through hole 412 are respectively provided on the upper and lower surfaces of the fourth platform 41. The diameter of the fifth through hole 411 is larger than that of the sixth through hole 412, so that a conical channel with a gradually decreasing inner diameter is formed between the fifth through hole 411 and the sixth through hole 412. In this way, the flow through hole of the adhesive changes from large to small, and the pressure of the adhesive changes from small to large. This pressurization process can extrude the air bubbles that are not completely removed from the adhesive.

[0061] Similarly, 4 bolts are evenly distributed on the fourth platform 41 in this area. These 4 bolts correspond to the positions of the 4 screw holes on the third platform 33 of the density test assembly 3. The density test assembly 3 and the glue overflow elimination assembly 4 can be seamlessly connected by screws. At the same time, these four screws also play a positioning role, so that the fifth through hole 411 at the center of the fourth platform 41 of the glue overflow elimination assembly 4 is aligned with the fourth through hole 331 at the center of the third platform 33 of the density test assembly 3, and the diameters of the fourth through hole 331 and the fifth through hole 411 are equal.

[0062] The main key points of the high-viscosity adhesive density test device in the present invention are as follows:

[0063] 1. The glue container 11 is cylindrical, and the material is not easy to deform. A glue outlet pipe 12 is connected to the center of the bottom of the cylindrical container. The glue container 11 can be directly placed in the centrifuge to mix and defoam the adhesive.

[0064] 2. The measuring tube 32 is cylindrical, and the material has a certain strength and is not easily deformed under common test conditions. Transparent materials such as glass and polymethyl methacrylate are preferred. Other metals and plastics can also be used if they meet the requirements.

[0065] 3. The inner diameter of the measuring tube 32 should be not less than 3 mm, and the length should be not less than 5 cm.

[0066] 4. The sealing ring of the glue container 11 is preferably made of silica gel, and other materials with lower hardness such as polyurethane can also be used.

[0067] 5. The wall thickness of the glue outlet tube 12 should be less than the difference between the outer diameter of the bottom of the buffer tank 21 and the inner diameter of the first through hole 211.

[0068] 6. The diameter of the first through hole 211 is less than the outer diameter of the bottom surface of the buffer tank 21.

[0069] 7. The diameter of the second through hole 221 is less than the diameter of the first through hole 211.

[0070] 8. The diameter of the sixth through hole 412 is less than the diameter of the fifth through hole 411.

[0071] 9. The diameters of the second through hole 221, the third through hole 311, the fourth through hole 331, and the fifth through hole 411 are all equal.

[0072] 10. The sizes and shapes of the first platform 22, the second platform 31, and the third platform 33 are exactly the same.

[0073] 11. The thickness of the fourth platform 41 is greater than that of the first platform 22, the second platform 31, and the third platform 33.

[0074] 12. The first platform 22, the second platform 31, the third platform 33, and the fourth platform 41 are all circular. The circular surface is flat and smooth, and can be seamlessly connected by screws without glue overflow after connection.

[0075] The usage method of the high-viscosity adhesive density testing device in the present invention is as follows:

[0076] The first step: Calibration

[0077] 1. Under the required test environment, first weigh the mass of the density test component 3 as m1 with a balance, and then lock the first platform 22 and the second platform 31 with 4 bolts so that the two discs of the first platform 22 and the second platform 31 are seamlessly fitted.

[0078] 2. Then mix and defoam the high-viscosity standard adhesive with a known density (density ρ0) according to the recommended ratio. This process directly uses the cylindrical glue container 11 for centrifugal mixing and defoaming, which can avoid the generation of bubbles due to secondary transfer of the adhesive (if it is a one-component adhesive, mixing is not required).

[0079] 3. After mixing and defoaming are completed, apply a certain pressure through the glue pushing rod 133 of the glue container 11, slowly extrude the adhesive from the glue outlet pipe 12, and discard the adhesive that was not evenly mixed at the beginning.

[0080] 4. After the color of the extruded adhesive is uniform, connect the glue container 11 and the cylindrical buffer tank 21 by thread, push the glue pushing rod 133 at a constant speed. After the adhesive starts to flow out from the fourth through hole 331, let it extrude for a period of time until the glue type of the adhesive extruded from the fourth through hole 331 is stable, the color is uniform, and there are no bubbles. Then stop the glue extrusion, and use a plastic scraper to scrape the adhesive flat along the lower surface of the third platform 33.

[0081] 5. Then connect the density test component 3 and the overflow glue removal component 4 with screws, continue to push the glue pushing rod 133 at a constant speed, and let the glue extrude for a period of time. After the glue type of the adhesive extruded from the sixth through hole 412 is stable, the color is uniform, and there are no bubbles, stop the glue extrusion.

[0082] 6. Remove all the screws between the first platform 22 and the second platform 31, the third platform 33 and the fourth platform 41, and use a plastic scraper to scrape the adhesive in the third through hole 311 and the fourth through hole 331 flat along the surface of the circular platform, weigh its mass m2, and obtain the standard volume V0 of the test tube = (m2 - m1) / ρ0.

[0083] The second step: Testing

[0084] Use the high-viscosity adhesive to be tested to conduct tests according to the method of the first step, obtain the mass difference Δm, and then the density ρ1 of the high-viscosity adhesive can be calculated as ρ1 = Δm / V0.

[0085] The principle of testing the density of the adhesive in the present invention is to utilize the basic density formula: ρ = m / v, that is, in a container with a certain volume V, completely fill it with the adhesive, weigh the mass m of the filled adhesive, and then use the formula to calculate, and the density of the measured adhesive can be obtained. Its principle is the same as that of testing density with a specific gravity cup.

[0086] The above are all the preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of the present invention.

Claims

1. A density testing device for high-viscosity adhesives, characterized in that: it includes a glue container assembly (1), a glue injection buffer assembly (2), a density testing assembly (3), and an overflow glue removal assembly (4) connected in sequence; the glue container assembly (1) includes a glue container (11), a glue outlet pipe (12), and a pusher (13); the pusher (13) is arranged on the inner circumference of the glue container (11); the glue outlet pipe (12) is arranged at the bottom of the glue container (11); the glue injection buffer assembly (2) includes a buffer tank (21), a first conical channel, and a first platform (22); the inner wall of the buffer tank (21) is connected to the outer wall of the glue outlet pipe (12); the first conical channel is arranged at the bottom of the buffer tank (21), and its inner diameter gradually decreases from top to bottom; the first platform (22) is arranged at the bottom of the first conical channel; the density testing assembly (3) includes a measuring tube (32), a second platform (31), and a third platform (33); the second platform (31) is arranged at the top of the measuring tube (32) and is connected to the first platform (22); the third platform (33) is arranged at the bottom of the measuring tube (32); the overflow glue removal assembly (4) includes a fourth platform (41); the fourth platform (41) is connected to the third platform (33); concentric fifth through holes (411) and sixth through holes (412) are respectively arranged on the upper and lower surfaces of the fourth platform (41); the diameter of the fifth through hole (411) is larger than the diameter of the sixth through hole (412), and a second conical channel with an inner diameter gradually decreasing from top to bottom is arranged between them; the glue injection buffer assembly (2) pressurizes through the first conical channel and removes air bubbles in the adhesive, and the overflow glue removal assembly (4) further removes air bubbles in the adhesive by pressurizing through the second conical channel.

2. The density testing device for high-viscosity adhesives according to claim 1, characterized in that: an exhaust hole (131) and a glue pushing rod (133) are arranged at the top of the pusher (13); an exhaust hole sealing rod (132) is connected in the exhaust hole (131).

3. The density testing device for high-viscosity adhesives according to claim 2, characterized in that: the glue container (11) is cylindrical; a sealing ring is arranged between the outer circumference of the pusher (13) and the inner circumference of the glue container (11).

4. The density testing device for high-viscosity adhesives according to claim 3, characterized in that: the length of the glue outlet pipe (12) is equal to the height of the buffer tank (21).

5. The density testing device for high-viscosity adhesives according to claim 4, characterized in that: the bottom of the buffer tank (21) is circular ring-shaped and is provided with a first through hole (211); the wall thickness of the glue outlet pipe (12) is less than the difference between the inner diameter of the buffer tank (21) and the inner diameter of the first through hole (211).

6. The density testing device for high-viscosity adhesives according to claim 5, characterized in that: The measuring tube (32) is integrally connected to the second platform (31) and the third platform (33); the diameter of the measuring tube (32) is greater than or equal to 3 mm, and the length is greater than or equal to 5 cm.

7. A high-viscosity adhesive density testing device according to claim 6, characterized in that: The first platform (22) is provided with a second through hole (221) communicating with the first conical channel; the second platform (31) is provided with a third through hole (311) communicating with the test tube; The diameters of the second through hole (221), the third through hole (311), the fourth through hole (331) and the fifth through hole (411) are all equal; The first platform (22) and the second platform (31), the third platform (33) and the fourth platform (41) are all connected by four screws.

8. A high-viscosity adhesive density testing device according to claim 7, characterized in that: The measuring tube (32) is made of a transparent material that is not easily deformed; the inner wall of the measuring tube (32) is smooth.

9. A high-viscosity adhesive density testing device according to claim 8, characterized in that: The inner wall of the buffer tank (21) is threadedly connected to the outer wall of the glue outlet pipe (12).

10. A method using the high-viscosity adhesive density testing device as claimed in claim 9, characterized in that: comprises the following steps: Measure the mass of the density testing assembly (3) as m1; Connect the first platform (22) and the second platform (31); Place a standard adhesive with a known density of ρ0 into the glue container (11); Apply pressure through the glue pushing rod (133) to extrude the standard adhesive from the glue outlet pipe (12); Connect the glue container (11) and the buffer tank (21); uniformly push the glue pushing rod (133); scrape the standard adhesive on the lower surface of the third platform (33); Connect the density testing assembly (3) and the overflow glue removal assembly (4); uniformly push the glue pushing rod (133); Stop the glue output; disconnect the connection between the first platform (22) and the second platform (31), and between the third platform (33) and the fourth platform (41); scrape the excess standard adhesive in the third through hole (311) and the fourth through hole (331); Weigh the mass of the density testing assembly (3) containing the standard adhesive as m2; Calculate the standard volume V0 of the density testing assembly (3) = (m2 - m1) / ρ0; Replace the standard adhesive with the adhesive to be tested, and measure the mass of the density testing assembly (3) containing the adhesive to be tested as m3 according to the above steps; obtain the mass of the adhesive to be tested as Δm = (m3 - m1); Calculate the density ρ1 of the adhesive to be tested = Δm / V0.

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