Device and method for testing specific gravity of high-viscoelastic adhesive

Abstract

The invention relates to a device and a method for testing the specific gravity of a high-viscoelastic adhesive, and relates to the field of adhesive testing. Comprising a large piston assembly, a glue container assembly, a density testing assembly and a propelling piston assembly, the density testing assembly is detachably connected to the top of the glue container assembly, and the large piston assembly is arranged in the glue container assembly in a sliding mode and used for evenly pushing an adhesive into the density testing assembly; the propelling piston assembly can be matched with the density testing assembly, the glue output amount is calculated through the datum line at the bottom of the propelling piston assembly and the scale marks on the outer side of the density testing assembly, the glue output weight is calculated in combination with the weighing device, and therefore the specific gravity of the high-viscoelastic adhesive is tested. According to the invention, the accuracy of the specific gravity test of the high-viscoelastic adhesive can be greatly improved.

Description

Technical Field

[0001] The present invention relates to the field of adhesive testing, and in particular to a device and method for testing the specific gravity of a high-viscoelastic adhesive. Background Art

[0002] Density is a fundamental property of materials and a crucial metric. For example, density testing allows workers to make basic, quick judgments about material properties. During adhesive preparation, operators can calculate the difference between the actual and theoretical filler weights based on the density of the adhesive after filling. This allows them to determine the uniformity of the adhesive composition and achieve quality control during the process.

[0003] Currently, the main methods for testing adhesive density are the pycnometer method and the density bottle method. The density bottle method is mainly suitable for measuring the density of powders and particles, while the pycnometer method is mainly suitable for liquid substances with good fluidity at room temperature and whose density is not suitable for pycnometer method.

[0004] However, for adhesives with high viscosity, poor fluidity and therefore easy to generate bubbles, the above two methods are not suitable. In order to solve the problem of measuring the specific gravity of high-viscosity materials, patent CN114636640A discloses a high-viscosity adhesive density testing device and method, which adopts a specific container, measuring components and auxiliary structures to form a density testing system. The density of high-viscosity adhesives is measured according to the density calculation method. This patent effectively avoids the problem of bubbles generated by the adhesive due to secondary transfer, and overcomes the common defect of the specific gravity cup test method that the corners cannot be filled with adhesive. However, since the density testing component needs to ensure a fixed volume of adhesive, it is relatively inflexible during the test process. Patent CN106568679A discloses a paste density testing system and method, which performs density testing by heating and vacuuming a specific volume to remove bubbles and remove excess adhesive. Although this patent ensures that the volume of the paste in the measuring container is equal to the capacity of the measuring container and solves the problem of inaccurate measurement results caused by bubbles entrained in high-viscosity materials, the final volume of the measured rubber depends on the degree to which the surface rubber is finally scraped flat. Therefore, the measurement accuracy cannot be guaranteed and there is a certain degree of subjectivity.

[0005] The above patent is aimed at high-viscosity adhesives, not adhesives with high viscoelasticity. Viscoelasticity is an important feature for some adhesives, which includes not only high viscosity but also high elasticity. The combination of the two properties brings greater challenges to the measurement of adhesives. For example, due to its high viscoelasticity, the adhesive will not only have problems with not being able to fill the density cup and having many bubbles, but also the problem that the lid of the density cup cannot be tightly closed after the adhesive is filled. Once the lid is forcibly closed with pressure, the adhesive will continue to overflow from the small hole in the middle of the density cup, eventually leading to a situation where the internal adhesive is not full. The above phenomenon can be attributed to the high elasticity of high-viscoelastic substances. To overcome the above difficulties, the usual practice is to heat the adhesive to improve its fluidity, and then test its density using the density cup method. However, the density at high temperature is obviously different from that at room temperature.

[0006] Therefore, how to provide a testing device and method for the specific gravity of high viscoelastic adhesives has become a technical problem that technicians in this field urgently need to solve. Summary of the Invention

[0007] The purpose of the present invention is to address the gaps in the prior art and provide a device and method for testing the specific gravity of a high-viscoelastic adhesive, which can greatly improve the accuracy of the specific gravity test of a high-viscoelastic adhesive.

[0008] To achieve the above-mentioned object, the present invention provides a device for testing the specific gravity of a high-viscoelastic adhesive, comprising: a large piston assembly, a glue container assembly, a density testing assembly, and a propulsion piston assembly;

[0009] The density testing assembly is detachably connected to the top of the glue container assembly, and the large piston assembly is slidably arranged in the glue container assembly to evenly push the adhesive into the density testing assembly; the pushing piston assembly can cooperate with the density testing assembly to calculate the amount of glue discharged through the reference line at the bottom of the pushing piston assembly and the scale line on the outside of the density testing assembly, and calculate the weight of the glue discharged in combination with the weighing device, thereby completing the test of the specific gravity of the high-viscoelastic adhesive.

[0010] Furthermore, the large piston assembly includes a large piston and a rubber pushing rod; the rubber pushing rod is connected to the top end of the large piston, and a sealing rubber ring is provided on the outer periphery of the large piston.

[0011] Furthermore, the glue container assembly includes a glue container and a glue outlet; the glue outlet is located at the center bottom of the glue container; the inner diameter of the glue container is consistent with the outer diameter of the large piston.

[0012] Furthermore, the density testing assembly includes a cone head cavity, a jacket and a jacket curling edge; the cone head cavity is connected to the bottom of the jacket, the jacket curling edge is connected to the top of the jacket, the scale line is set on the outer wall of the jacket, and the accuracy of the scale line is 0.01~0.03ml; the inner diameter of the jacket is consistent with the caliber of the glue outlet.

[0013] Furthermore, the outer sleeve curling edge is provided with an opening for screw positioning and fixing, and a detachable connection with the glue container is achieved through the screws and the opening.

[0014] Furthermore, the thrust piston assembly includes a thrust piston, a sealing ring, a core rod and a button; one end of the core rod is connected to the button, and the other end is connected to the thrust piston, the sealing ring is arranged on the outer periphery of the thrust piston, and the reference line is arranged at the bottom end of the thrust piston; the diameter of the thrust piston is consistent with the inner diameter of the outer sleeve.

[0015] Furthermore, the glue container is cylindrical and is made of a transparent material with a smooth inner wall that is not easily deformed.

[0016] Furthermore, the outer shell is made of a transparent material with a smooth inner wall that is not easily deformed.

[0017] A method for testing the specific gravity of a high-viscoelastic adhesive comprises the following steps:

[0018] Fix the bottom of the glue container and the curled edge of the outer shell by screws to achieve the connection between the glue container assembly and the density testing assembly; heat the adhesive, degas the adhesive, and inject it into the glue container;

[0019] Use the large piston assembly to push the adhesive evenly into the jacket through the glue outlet;

[0020] After the adhesive in the outer sleeve is injected, the adhesive container assembly is separated from the density testing assembly;

[0021] Insert the push piston assembly into the outer sleeve and push the adhesive at a constant speed with your hand until a small amount of adhesive is squeezed out of the cone head cavity. Then let it stand and cool naturally to 23±1℃.

[0022] Density testing process:

[0023] Push the core rod through the outer sleeve to squeeze out a little adhesive so that the baseline of the density test component reaches a certain scale. After it has been stationary for a while, record the volume scale v1. Wipe the cone head and weigh it, and record the weight m1.

[0024] When the adhesive in the density test component stops rebounding, continue to push out a little more adhesive until the base line of the sealing ring reaches a certain scale. After a period of rest, record the volume scale v2. Wipe the cone head and weigh it, and record the weight m2.

[0025] The specific gravity is obtained by the calculation formula:

[0026] ρ=(m1-m2) / (v1-v2).

[0027] The beneficial effects of the present invention are:

[0028] 1. The present invention is suitable for testing the specific gravity of high-viscosity single-component or multi-component adhesives.

[0029] 2. The adhesive is pushed directly from the wide-mouth container into the narrow-mouth density test device to avoid bubbles during the secondary transfer process.

[0030] 3. During the test, the adhesive will not come into contact with other solvents or media, thus avoiding the reaction between the adhesive and the media and affecting the test accuracy.

[0031] 4. Due to the viscoelasticity of the adhesive, the piston of the density test assembly allows the rubber to undergo stress relaxation in the outer jacket, and the value can be accurately read after the stress relaxation is completed, thereby ensuring more accurate test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a schematic diagram of the installation structure of the large piston assembly, the glue container assembly and the density testing assembly of the present invention;

[0033] Figure 2 for Figure 1 sectional view of

[0034] Figure 3 This is a schematic structural diagram of the propulsion piston assembly of the present invention;

[0035] Figure 4 for Figure 3 sectional view of .

[0036] Figure 5 This is an exploded view of the large piston assembly and the glue container assembly of the present invention;

[0037] Figure 6 It is a structural schematic diagram of the density testing assembly of the present invention;

[0038] Figure 7 These are the stress relaxation curves of adhesive 1 and adhesive 2.

[0039] Among them, in the figure:

[0040] 1-large piston assembly; 11-including large piston; 12-plastic push rod; 2-plastic container assembly; 21-including plastic container; 22-plastic outlet; 3-density test assembly; 31-including cone head cavity; 32-scale line; 33-jacket; 34-jacket curling; 4-propelling piston assembly; 41-including propulsion piston; 42-sealing ring; 43-core rod; 44-reference line; 45-hand press. DETAILED DESCRIPTION

[0041] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0042] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequential order. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0043] In this application, terms such as "upper," "lower," "left," "right," "front," "back," "top," "bottom," "inner," "outer," "center," "vertical," "horizontal," "transverse," and "longitudinal" indicate positions or locations based on the positions or locations shown in the accompanying drawings. These terms are primarily intended to better describe this application and its embodiments and are not intended to limit the devices, elements, or components indicated to having a specific orientation, or to being constructed or operated in a specific orientation.

[0044] Furthermore, some of the above terms may be used to express other meanings besides indicating a position or location. For example, the term "on" may also be used to express a dependency or connection in certain circumstances. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0045] Furthermore, the terms "installed," "disposed," "provided with," "connected," "connected," and "socketed" should be interpreted broadly. For example, they can refer to fixed connections, removable connections, or integral structures; mechanical connections or electrical connections; direct connections, indirect connections through an intermediary, or internal communication between two devices, elements, or components. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0046] like Figure 1 As shown, the present invention provides a device for testing the specific gravity of a high-viscoelastic adhesive, comprising: a large piston assembly 1, a glue container assembly 2, a density testing assembly 3 and a pushing piston assembly 4;

[0047] The density testing assembly 3 is detachably connected to the top of the glue container assembly 2, and the large piston assembly 1 is slidably set in the glue container assembly 2 to evenly push the adhesive into the density testing assembly 3; the pushing piston assembly 4 can cooperate with the density testing assembly 3, and the glue output amount is calculated by the reference line 44 at the bottom of the pushing piston assembly 4 and the scale line 32 on the outside of the density testing assembly 3, and the glue output weight is calculated in combination with the weighing device, thereby completing the test of the specific gravity of the high viscoelastic adhesive.

[0048] The large piston assembly 1 includes a large piston 11 and a rubber pushing rod 12; the rubber pushing rod 12 is connected to the top of the large piston 11, and a sealing rubber ring is provided on the outer periphery of the large piston 11. The large piston 11 is made of high-strength stainless steel material, which has excellent corrosion resistance and pressure resistance, and can maintain stable performance during long-term use. The rubber pushing rod 12 is made of high-strength aluminum alloy, which not only ensures sufficient strength but also has a light weight and is easy to operate. The surfaces of the large piston 11 and the rubber pushing rod 12 are specially treated, such as chrome plating or nitriding or sealed with a sealing ring, to improve their wear resistance and smoothness, reduce friction with the inner wall of the rubber container, and ensure the accuracy of the test.

[0049] The glue container assembly 2 includes a glue container 21 and a glue outlet 22. The outlet 22 is located at the center bottom of the glue container 21. The inner diameter of the glue container 21 matches the outer diameter of the large piston 11. The glue container 21 is cylindrical and made of a transparent material with a smooth, non-deformable inner wall. The glue container 21 is made of glass, polyester, or other strong plastics, preferably polycarbonate.

[0050] The density test assembly 3 comprises a cone head cavity 31, an outer shell 33, and an outer shell bead 34. The cone head cavity 31 is connected to the bottom of the outer shell 33, and the outer shell bead 34 is connected to the top of the outer shell 33. Scale lines 32 are provided on the outer wall of the outer shell 33, and the scale lines are marked with different colors to facilitate quick and accurate measurement under different lighting conditions. The scale line accuracy is 0.01 to 0.03 ml, and more preferably 0.02 ml. The inner diameter of the outer shell 33 is consistent with the diameter of the glue outlet 22. The outer shell bead 34 has an opening for screw positioning and fixing, which enables a removable connection to the glue container 21 through the screws and the opening. The cone head cavity 31 is conical in shape to prevent bubbles and ensure accurate measurements. The outer shell 33 is made of a transparent material with a smooth inner wall that is not easily deformed. The outer shell 33 should be made of a material that is strong and does not deform under common testing conditions, such as glass, polyester, or other transparent materials. Other metals and plastics are also acceptable if they meet the requirements. The outer jacket hem 34 component should be made of a material with a certain strength and not easily deformed under common test conditions. Polyester and other materials are preferred, and other metals and plastics may also be used if they meet the requirements.

[0051] The thrust piston assembly 4 comprises a thrust piston 41, a sealing ring 42, a core rod 43, and a handle 45. One end of the core rod 43 is connected to the handle 45, and the other end is connected to the thrust piston 41. The sealing ring 42 is located on the outer circumference of the thrust piston 41, and the reference line 44 is located at the bottom end of the thrust piston 41. The diameter of the thrust piston 41 is consistent with the inner diameter of the outer sleeve 33. The thrust piston 41 is required to fit seamlessly with the sealing ring 42 to prevent adhesive from leaking out of the gap after connection. The thrust piston assembly should be pushed into the test assembly outer sleeve at a constant speed to ensure accurate volume measurement. The core rod 43 should be made of a material that is strong and resistant to deformation under common testing conditions. Glass, polymethyl methacrylate, or other transparent materials are preferred, although other metals or plastics are acceptable if they meet the requirements. The reference line is black and accurately controls the position of the thrust piston, ensuring consistency and repeatability between tests. The handle is elliptical or circular in shape, allowing for easy control of the thrust piston's speed and force, thereby precisely controlling the adhesive flow rate.

[0052] The present invention also provides a method for testing the specific gravity of a high viscoelastic adhesive, comprising the following steps:

[0053] Secure the bottom of the glue container 21 to the outer casing curling 34 using screws to connect the glue container assembly 2 to the density test assembly 3. Heat the adhesive, degas, and inject it into the glue container 21. Quickly place the adhesive into the glue container while it is still fluid and push it into the outer casing of the density test assembly to prevent the adhesive from cooling and solidifying and affecting the operation and test results.

[0054] The adhesive is evenly pushed into the outer sleeve 33 through the glue outlet 22 by the large piston assembly 1;

[0055] After the adhesive in the outer sleeve 33 is injected, the adhesive container assembly 2 is separated from the density testing assembly 3;

[0056] Insert the push piston assembly 4 into the outer sleeve 33 and push the adhesive at a constant speed with the pressing hand 45 until a small amount of adhesive is squeezed out of the cone head cavity 31. Then, let it stand and cool naturally to 23±1℃.

[0057] Density testing process:

[0058] Push the core rod 43 through the outer sleeve 33 to squeeze out a small amount of adhesive so that the reference line 44 of the density test component 3 reaches a certain scale. After a period of rest, record the volume scale v1. Wipe the cone head and weigh it, and record the weight m1. The rest time t is 3-20 minutes to ensure that no adhesive will overflow from the gap.

[0059] After the adhesive in the density test component 3 stops rebounding, continue to push out a little more adhesive until the base line 44 of the sealing ring 42 reaches a certain scale. After a period of rest, record the volume scale v2. After wiping the cone head and weighing it, record the weight m2. The rest time t is 3-20 minutes to ensure that no adhesive will overflow from the gap.

[0060] The specific gravity is obtained by the calculation formula:

[0061] ρ=(m1-m2) / (v1-v2).

[0062] This device is suitable for testing the specific gravity of high-viscosity single-component or multi-component adhesives. The adhesive is pushed directly from a wide-mouth container into a narrow-mouth density tester, eliminating bubbles during secondary transfer. During the test, the adhesive is kept out of contact with other solvents or media, preventing reactions between the adhesive and the media that could affect test accuracy. Due to the viscoelastic nature of the adhesive, the piston of the density tester allows the adhesive to undergo stress relaxation within the outer casing. After stress relaxation is complete, accurate readings can be obtained, ensuring more accurate test results.

[0063] In the following examples, the specific gravity test device of the present invention was used for measurements. Example 1 used Adhesive 1, which has a low viscoelasticity; Example 2 used Adhesive 2, which has a high viscoelasticity. Comparative Examples 1 and 2 used the specific gravity cup method to test the two samples, respectively.

[0064] The stress relaxation curves of adhesive 1 and adhesive 2 are shown in Figure 7 .

[0065] As can be seen from the above figure, under the same strain conditions, the stress generated by Adhesive 2, a high-viscoelastic material, is much higher than that of Adhesive 1, a low-viscoelastic material, and the relaxation time of Adhesive 2 is much longer than that of Adhesive 1, a low-viscoelastic material. During the measured time, the stress of Adhesive 1 has already been relaxed, but Adhesive 2 is still in the process of relaxation and has not reached equilibrium. This shows that Adhesive 2, due to its high viscoelasticity, maintains a high stress state for a long time under the same strain conditions, while the process of eliminating internal stress is very slow. This characteristic affects the accuracy of traditional testing, which can be reflected by comparing the results of the embodiment and the comparative example.

[0066] Example 1:

[0067] In this embodiment, the bottom of the adhesive container is secured to the outer edge of the density testing assembly using screws, thereby connecting the adhesive container assembly to the density testing assembly. Adhesive 1 is heated, vacuumed, and de-bubbled before being injected into the adhesive container. While Adhesive 1 still maintains good fluidity, the large piston assembly is used to push Adhesive 1 into the density testing assembly at a constant speed. The adhesive container assembly and density testing assembly are disassembled, and the push piston assembly is inserted into the outer edge of the density testing assembly at a constant speed.

[0068] When a small amount of rubber is squeezed out of the cone head cavity, the baseline of the density test component reaches a certain scale. After it is still for 1 minute, read the value and record the volume scale v1. Wipe the cone head and weigh it, record the weight m1;

[0069] Continue to push out a little more rubber until the baseline reaches a certain scale. After it rests for 1 minute, read the value and record the volume scale v2. Wipe the cone head and weigh it, recording the weight m2.

[0070] By calculation formula:

[0071] ρ = (m1-m2) / (v1-v2) to get the specific gravity. The results are shown in Table 1.

[0072] Example 2:

[0073] Adhesive 2 was tested using the same method as in Example 1, with a rest time of 5 minutes. V1, V2, M1, and M2 were obtained. The calculation formula is:

[0074] ρ = (m1-m2) / (v1-v2) to get the specific gravity. The results are shown in Table 1.

[0075] Comparative Example 1:

[0076] Adhesive 1 was heated, vacuum-defoamed, and then poured into a pycnometer. After cooling to room temperature, the lid was closed and excess adhesive was squeezed out through the small hole in the center. The mixture was wiped and weighed to obtain the total weight of Adhesive 1 and the pycnometer. The mass of the adhesive was calculated as the difference between the total weight and the empty cup. The pycnometer capacity was 37 ml. The density of Adhesive 1 is the ratio of mass to volume. The results are shown in Table 1.

[0077] Comparative Example 2:

[0078] Adhesive 2 was measured using the same method as in Comparative Example 1.

[0079] However, during the process, it was observed that the lid could not be closed due to the high viscoelastic properties of Adhesive 2. After forcibly closing the lid, Adhesive 2 was observed to continuously overflow from the small hole in the middle, and it took nearly 50 minutes to stop.

[0080] The mass of the adhesive is the difference between the total weight and the empty cup. The specific gravity cup has a capacity of 37 ml. The density of Adhesive 1 is the ratio of mass to volume. The results are shown in Table 1.

[0081] The following is a comparison of the two test methods:

[0082]

[0083] Table 1

[0084] As shown in Table 1, the results of the present invention test method for low-viscoelastic adhesive 1 are very close to those of the specific gravity cup test method, while the specific gravity cup test results of high-viscoelastic adhesive 2 are much smaller than those of the present invention.

[0085] This is because high-viscoelastic adhesives generate high internal stress in the gravity cup test due to their high viscoelasticity, and the release of internal stress takes a long time. The characteristics of high stress and slow relaxation have been verified and explained in the stress relaxation curve section above.

[0086] During the specific gravity cup test, adhesive continuously overflows from the small hole in the center during the release process, resulting in an empty cup phenomenon, and the measured mass is lower than the actual value. However, the test device of the present invention allows for the rebound of highly viscoelastic materials in the density test component, thus accurately measuring mass and volume, resulting in greater accuracy.

[0087] The above description is merely a preferred embodiment of the present invention and does not limit the technical scope of the present invention. Therefore, any minor modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A device for testing the specific gravity of a high viscoelastic adhesive, characterized in that: include: A large piston assembly (1), a glue container assembly (2), a density testing assembly (3) and a propulsion piston assembly (4); The density testing component (3) is detachably connected to the top of the glue container component (2); the large piston component (1) is slidably arranged in the glue container component (2) and is used to push the adhesive evenly into the density testing component (3); the pushing piston component (4) can cooperate with the density testing component (3) to calculate the amount of glue discharged by comparing the reference line (44) at the bottom of the pushing piston component (4) with the scale line (32) on the outside of the density testing component (3); and the glue discharge weight is calculated in combination with a weighing device, thereby completing the test of the specific gravity of the high-viscoelastic adhesive.

2. A device for testing the specific gravity of a high viscoelastic adhesive as claimed in claim 1, characterized in that: The large piston assembly (1) comprises a large piston (11) and a rubber pushing rod (12); the rubber pushing rod (12) is connected to the top end of the large piston (11), and a sealing rubber ring is provided on the outer periphery of the large piston (11).

3. A device for testing the specific gravity of a high viscoelastic adhesive as claimed in claim 2, characterized in that: The glue container assembly (2) comprises a glue container (21) and a glue outlet (22); the glue outlet (22) is located at the center bottom of the glue container (21); the inner diameter of the glue container (21) is consistent with the outer diameter of the large piston (11).

4. A device for testing the specific gravity of a high viscoelastic adhesive as claimed in claim 3, characterized in that: The density testing assembly (3) comprises a cone head cavity (31), an outer jacket (33) and an outer jacket curling edge (34); the cone head cavity (31) is connected to the bottom of the outer jacket (33), the outer jacket curling edge (34) is connected to the top of the outer jacket (33), the scale line (32) is arranged on the outer wall of the outer jacket (33), and the accuracy of the scale line (32) is 0.01 to 0.03 ml; the inner diameter of the outer jacket (33) is consistent with the caliber of the glue outlet (22).

5. A device for testing the specific gravity of a high viscoelastic adhesive as claimed in claim 4, characterized in that: The outer shell curling edge (34) is provided with an opening for screw positioning and fixing, and a detachable connection with the glue container (21) is achieved through the screw and the opening.

6. A device for testing the specific gravity of a high viscoelastic adhesive as claimed in claim 4 or 5, characterized in that: The propulsion piston assembly (4) includes a propulsion piston (41), a sealing ring (42), a core rod (43) and a pressing handle (45); one end of the core rod (43) is connected to the pressing handle (45), and the other end is connected to the propulsion piston (41); the sealing ring (42) is arranged on the outer periphery of the propulsion piston (41), and the reference line (44) is arranged at the bottom end of the propulsion piston (41); the diameter of the propulsion piston (41) is consistent with the inner diameter of the outer sleeve (33).

7. A device for testing the specific gravity of a high viscoelastic adhesive as claimed in claim 3, characterized in that: The glue container (21) is cylindrical and is made of a transparent material with a smooth inner wall that is not easily deformed.

8. A device for testing the specific gravity of a high viscoelastic adhesive as claimed in claim 4, characterized in that: The outer jacket (33) is made of a transparent material with a smooth inner wall and is not easily deformed.

9. A method for testing the specific gravity of a high viscoelastic adhesive, characterized in that: The steps include: The bottom of the glue container (21) is fixed to the outer casing curling edge (34) by screws to achieve the connection between the glue container assembly (2) and the density test assembly (3); the adhesive is heated and degassed before being injected into the glue container (21); The adhesive is evenly pushed into the outer sleeve (33) through the glue outlet (22) by the large piston assembly (1); After the adhesive in the outer sleeve (33) is injected, the adhesive container assembly (2) is separated from the density testing assembly (3); Insert the push piston assembly (4) into the outer sleeve (33), and push the adhesive at a constant speed with the pressing hand (45) until a small amount of adhesive is squeezed out of the cone head cavity (31), then stop, and then let it stand and cool naturally to 23±1℃; Density testing process: Push the core rod (43) through the outer sleeve (33) to squeeze out a little adhesive so that the reference line (44) of the density test component (3) reaches a certain scale. After a period of rest, record the volume scale v1, wipe the cone head and weigh it, and record the weight m1; When the adhesive in the density test component (3) stops rebounding, continue to push out a little adhesive until the base line (44) of the sealing ring (42) reaches a certain scale. After a period of rest, record the volume scale v2, wipe the cone head and weigh it, and record the weight m2; The specific gravity is obtained by the calculation formula: ρ=(m1-m2) / (v1-v2).

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