Polyurethane rheology testing apparatus and method

Abstract

The application belongs to the technical field of rheological property testing, and relates to a polyurethane rheological property testing device, which comprises a base, a rheometer, a mold shell and a shear plate, the lower part of the rheometer is provided with a rotating shaft corresponding to the base, the mold shell is arranged on the base, the top of the mold shell is open, the shear plate is arranged at the lower part of the rotating shaft and is arranged on the top of the mold shell in a matched mode, a sealing unit is arranged between the shear plate and the sidewall of the mold shell, the rotating shaft drives the shear plate to rotate in the mold shell, the sealing unit is used for sealing the top of the mold shell, a grouting hole is arranged on the mold shell or the shear plate, and the grouting hole is connected with a slurry unit. The application also discloses a polyurethane rheological property testing method. The application can control the material density by controlling the grouting amount, and can test the difference between the rheological properties of the slurry formed after grouting and the slurry formed by stirring and mixing.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of rheological property testing, and particularly relates to a polyurethane rheological property testing device and method. BACKGROUND

[0002] Rheology mainly studies the viscoelastic response law of materials under external force. For grouting, the rheological properties of materials are the key to affect the grouting repair effect. Therefore, a rheometer is usually used to determine the rheological properties of materials, and by studying the viscoelasticity change law of materials under the action of different shear test methods, the grouting parameters are adjusted, and the diffusion range of grouting materials and the performance after grouting are adjusted, so as to achieve the purpose of grouting repair. However, for two-component polyurethane grouting materials, the expansion involved in the grouting process is the main feature of the grouting repair, and the characteristics of rapid reaction and expansion and solidification after mixing of two materials are used to achieve the purpose of reinforcing foundation, filling void or lifting floor. In actual use, the expansion force and mechanical properties after forming of the material are usually controlled by controlling the density of the material. When testing the rheological properties of such self-expanding polyurethane materials, the usual method is to mix and stir the AB two components and then immediately put them into a rotary rheometer for testing. However, since the polyurethane material for grouting reacts quickly, it will solidify and foam in tens of seconds, which makes the material not have enough operation time for rheological testing after mixing and stirring, and the material is exposed to air during rheological testing, so it is impossible to test the rheological properties of materials of different densities after reaction, and the density of the material is the most important factor affecting the grouting effect.

[0003] In addition, due to the influence of pressure and temperature, the reliability of the whole test result is affected, so in order to guarantee the comprehensive test and analysis of various properties, it is necessary to further improve the existing rheological test and optimize the grouting effect under various environmental factors. SUMMARY

[0004] The application aims at the above-mentioned problems and deficiencies, and provides a polyurethane rheological property testing device and method. The application can directly mix materials by grouting, control the density of materials by controlling the grouting amount, solve the problem of difficult testing of such polyurethane grouting materials, and test the difference between the rheological properties of grout formed after grouting and grout formed by stirring and mixing. The equipment is simple and easy to operate.

[0005] To achieve the above-mentioned purpose, the technical scheme adopted is:

[0006] A polyurethane rheological property testing device, comprising:

[0007] a base;

[0008] A rheometer, a rotating shaft corresponding to the base is arranged at the lower part of the rheometer;

[0009] A mold shell is arranged on the base, and a top of the mold shell is open; and

[0010] A shearing plate is arranged at the lower part of the rotating shaft, and the shearing plate is matched with the top of the mold shell, and a sealing unit is arranged between the shearing plate and the side wall of the mold shell;

[0011] The rotating shaft drives the shearing plate to rotate in the mold shell, the sealing unit is used for sealing the top of the mold shell, a grouting hole is arranged on the mold shell or the shearing plate, and a slurry unit is connected to the grouting hole.

[0012] According to the polyurethane rheological property testing device, preferably, a limiting unit is arranged between the base and the mold shell;

[0013] The limiting unit is a polygonal boss and a polygonal groove arranged on the base and the mold shell respectively; or / and the limiting unit is a connecting bolt arranged between the base and the mold shell.

[0014] According to the polyurethane rheological property testing device, preferably, a pressure table is arranged on the base, the mold shell is arranged on the pressure table, and a pressure sensor is arranged between the pressure table and the base; the rotating shaft and the shearing plate are fixedly connected through bolts; a lifting unit is arranged between the rheometer and the base, the lifting unit comprises a guide column, a support plate, an upper top plate and a power push rod, the guide column is arranged between the base and the upper top plate, the rheometer is arranged on the support plate, the support plate is slidingly arranged on the guide column, and the power push rod drives the support plate to slide up and down along the guide column.

[0015] According to the polyurethane rheological property testing device, preferably, the sealing unit comprises an annular embedding groove arranged on the side wall of the shearing plate and a sealing ring arranged in the annular embedding groove; or

[0016] The sealing unit comprises a rubber sealing ring arranged on the inner wall of the top of the mold shell, an annular sealing tooth is arranged on the rubber sealing ring, and a gear ring engaged with the annular sealing tooth is arranged on the shearing plate.

[0017] According to the polyurethane rheological property testing device, preferably, the sealing unit comprises:

[0018] A base in the shape of a ring;

[0019] Assembly grooves are arranged on the base platform, the assembly grooves are annular and are arranged in an inclined manner.

[0020] Sealing bodies are arranged in the assembly grooves, the sealing bodies are frustoconical, and sealing heads are arranged at outer ends of the sealing bodies and are inclined towards the bottom of the mold shell and are in sealing contact with the inner wall of the mold shell.

[0021] According to the polyurethane rheological property testing device, preferably, a liquid injection cavity is arranged on the base platform, a liquid sealing cavity is formed between adjacent sealing bodies, the liquid injection cavity is in communication with the liquid sealing cavity through a liquid sealing branch, and a liquid injection port is arranged at the top of the liquid injection cavity.

[0022] A stepped assembly platform is arranged on the shear plate, the base platform is arranged on the assembly platform in a matched manner, and the assembly platform and the base platform are fixed through bolt connection.

[0023] The lower part of the base platform is provided with an annular supporting platform corresponding to the lowermost sealing body, and the annular supporting platform is supported at the lower part of the corresponding sealing head.

[0024] According to the polyurethane rheological property testing device, preferably, the slurry unit comprises a liquid storage tank and a grouting pump, and the liquid storage tank is at least two; each liquid storage tank is connected with a grouting hole through a grouting pump, and a one-way valve is arranged at the front part of the grouting hole.

[0025] According to the polyurethane rheological property testing device, preferably, the grouting hole is a plurality of holes arranged in a circumferential distribution manner on the mold shell, and the slurry in each liquid storage tank is injected into the mold shell through at least one corresponding grouting hole; or

[0026] The grouting hole is at least two holes arranged on the shear plate, the liquid storage tank and the grouting pump are arranged on the top of the shear plate in a distributed manner, and the slurry in each liquid storage tank is injected into the mold shell through at least one corresponding grouting hole; or

[0027] The mixing device further comprises a mixer arranged at the front part of the one-way valve, and each liquid storage tank is connected with the feed end of the mixer through a grouting pump; the mixer comprises a cylindrical mixing shell, a turbulence blade and a cover plate, a tapered discharge port is arranged at the first end of the mixing shell, a threaded section is arranged at the second end of the mixing shell, the cover plate is arranged on the threaded section in a matched manner, at least two feed connectors are arranged on the cover plate, a positioning sleeve is fixed on the outer periphery of the turbulence blade, corresponding clamping strips and clamping grooves are arranged between the outer wall of the positioning sleeve and the inner wall of the mixing shell, and the turbulence blade and the positioning sleeve are arranged in the mixing shell in a matched manner.

[0028] The polyurethane rheological property testing device according to the application preferably further comprises a temperature control unit, a sink is arranged on the outer wall of the mold shell, and the temperature control unit comprises a temperature control shell arranged in the sink and an electric heating assembly arranged in the temperature control shell.

[0029] A polyurethane rheological property testing method, which utilizes the polyurethane rheological property testing device described above to test the rheological property of polyurethane, specifically comprising the following steps:

[0030] Assembling and connecting each component of the polyurethane rheological property testing device;

[0031] According to the preset polyurethane control parameters, the slurry injection amount and the rheometer action parameters are determined;

[0032] Starting the slurry unit to inject slurry;

[0033] Starting the rheometer to act and acquiring the rheological property data of polyurethane.

[0034] The above technical solution has the following beneficial effects:

[0035] The present application can directly mix materials by injecting slurry, and control the material density by controlling the injection amount, thereby solving the problem of difficult testing of such polyurethane injection materials, and can test the difference in rheological properties between the slurry formed by injection and the slurry formed by mixing through stirring. The device is simple and easy to operate.

[0036] The present application further optimizes the existing rheometer, and can ensure that the polyurethane material in the mold shell is in a sealed state during the shearing process of the rotary rheometer, thereby realizing quantitative analysis of the seal and facilitating use in the injection application process. The sealing unit is arranged to ensure sealing during rotation and to ensure the sealing effect, thereby avoiding sealing failure during polyurethane expansion and improving the overall stability. The present application also facilitates disassembly and assembly, cleaning and replacement of components, and has the characteristics of strong universality.

[0037] The slurry unit of the present application can mix the slurry, avoid uneven mixing or failure to pour the mixed slurry into the mold shell in time, and cause poor reliability of test data. The present application can test under the conditions of constant volume, controllable density, and stable sealing performance, thereby fully ensuring the reliability of the test experiment. The structure design of the mixer can fully mix the slurry before it enters the mold shell, thereby flowing into the mold shell in time, having good timeliness, being easy to operate and control, and having high mechanization and automation.

[0038] The application can also synchronously detect temperature and pressure, so as to obtain relevant data parameters, and more finely explore various influence factors of the polyurethane rheological property, and more help the application of the polyurethane under different environmental conditions. BRIEF DESCRIPTION OF DRAWINGS

[0039] In order to more clearly illustrate the technical solutions of the embodiments of the application, the drawings of the embodiments of the application will be briefly introduced below. The drawings are only used to show some embodiments of the application, and the application is not limited to the drawings.

[0040] Figure 1 Fig. 1 is a structural schematic diagram of a polyurethane rheological property testing device according to an embodiment of the application.

[0041] Figure 2 Fig. 2 is a structural schematic diagram of a sealing unit according to an embodiment of the application.

[0042] Figure 3 Fig. 3 is a structural schematic diagram of a polyurethane rheological property testing device according to an embodiment of the application.

[0043] Figure 4 Fig. 4 is a structural schematic diagram of a mixer according to an embodiment of the application.

[0044] Figure 5 Fig. 5 is a structural schematic diagram of a polyurethane rheological property testing device according to an embodiment of the application.

[0045] Figure 6 Fig. 6 is a structural schematic diagram of a polyurethane rheological property testing device according to an embodiment of the application. Figure 5 Fig. 7 is a structural schematic diagram of the A-A direction of Fig. 6.

[0046] Figure 7 Fig. 8 is a curve of the expansion force of a polyurethane material changing with time under different densities.

[0047] Figure 8 Fig. 9 is a relationship between the expansion force of a polyurethane material and density.

[0048] Fig. 10 is a sequence number in the drawing:

[0049] 100 is a base, 101 is a pressure platform, 102 is a polygon boss, and 103 is a polygon groove.

[0050] 200 is a rheometer, and 201 is a rotating shaft.

[0051] 300 is a mold shell, and 301 is a grouting hole.

[0052] 400 is a shear plate, 401 is a base, 402 is an assembly groove, 403 is a sealing body, 404 is a sealing head, 405 is a liquid injection cavity, 406 is a liquid seal cavity, 407 is a liquid seal branch, 408 is a liquid injection port, 409 is an assembly platform, 410 is a bolt, and 411 is an annular bearing platform;

[0053] 501 is a guide column, 502 is a support plate, 503 is an upper top plate, and 504 is a power push rod;

[0054] 601 is a liquid storage tank, 602 is a grouting pump, 603 is a mixer, 604 is a mixing shell, 605 is a turbulence blade, 606 is a cover plate, 607 is a positioning sleeve, 608 is a clamping strip, 609 is a discharge port, 610 is a feeding connector, and 611 is a one-way valve;

[0055] 701 is a temperature control shell. DETAILED DESCRIPTION

[0056] In the following, the example schemes of the embodiments of the present application will be described clearly and completely with reference to the accompanying drawings of the embodiments of the present application. Unless otherwise defined, the technical terms or scientific terms used in the present application should be understood as the common meanings understood by those skilled in the art.

[0057] In the description of the present application, it should be understood that the expressions of "first", "second" are used to describe the elements of the present application, and do not represent any order, quantity or importance limitation, but only to distinguish one component from another component.

[0058] It should be noted that when an element is described as "connected", "coupled" or "linked" to another element, it can mean that it is directly connected, coupled or linked to the other element, but it should be understood that there can be intermediate elements between the two; that is, it covers both direct connection and indirect connection.

[0059] It should be noted that the use of "one" or "a" and similar words does not necessarily mean a quantity limitation. The words "including" or "containing" and similar words mean that the elements or objects before the words cover the elements or objects listed after the words and their equivalents, and do not exclude other elements or objects.

[0060] It should be noted that the terms indicating the orientation or position relationship such as "upper", "lower", "left", "right" and the like are only used to represent the relative position relationship, which is for the convenience of describing the present application, and the devices or elements referred to do not necessarily have a specific orientation, and are not necessarily constructed and operated in a specific orientation; when the absolute position of the described object changes, the relative position relationship may also change accordingly.

[0061] Reference should be made to Figures 1-6The application discloses a polyurethane rheological property testing device, which comprises a base 100, a rheometer 200, a mold shell 300 and a shear plate 400, the lower part of the rheometer 200 is provided with a rotating shaft 201 corresponding to the base 100, the mold shell 300 is arranged on the base 100, the top of the mold shell 300 is open, the shear plate 400 is arranged at the lower part of the rotating shaft 201 and is arranged on the top of the mold shell 300 in a matched mode, and a sealing unit is arranged between the shear plate 400 and the side wall of the mold shell 300, the rotating shaft 201 drives the shear plate 400 to rotate in the mold shell 300, and the sealing unit is used for sealing the top of the mold shell, and a grouting hole 301 is arranged on the mold shell or the shear plate, and a slurry unit is connected to the grouting hole 301.

[0062] A limiting unit is arranged between the base 100 and the mold shell 300 in the embodiment, the limiting unit is a polygonal boss 102 and a polygonal groove 103 arranged on the base 100 and the mold shell 300 respectively, or the limiting unit is a connecting bolt arranged between the base 100 and the mold shell 300, the limiting unit is used for positioning the mold shell 300 and the base 100 and preventing the mold shell 300 from rotating, thereby guaranteeing the stability in the working process, and other structures, such as buckles or clamps, can also be used for clamping and positioning, or a plurality of combination structures in the above structures can be used for fixing.

[0063] In order to facilitate pressure data acquisition, a pressure table 101 is further arranged on the base 100, the mold shell 300 is arranged on the pressure table 101, and a pressure sensor is arranged between the pressure table 101 and the base 100, the rotating shaft 201 and the shear plate 400 are fixedly connected through bolts, a lifting unit is arranged between the rheometer 200 and the base 100, the lifting unit comprises a guide column 501, a supporting plate 502, an upper top plate 503 and a power push rod 504, the guide column is arranged between the base and the upper top plate, the rheometer is arranged on the supporting plate, the supporting plate is slidingly arranged on the guide column, and the power push rod 504 drives the supporting plate 502 to slide up and down along the guide column, wherein the power push rod can adopt an electric push rod or a screw nut transmission structure, and the lifting unit can be separately arranged, when some existing rheometers are used, the rheometers can not need to be redesigned if they are provided with lifting units, the lifting unit in the embodiment is used for conveniently adjusting the height of the shear plate 400 and facilitating the assembly of parts, and on the other hand, the volume of the mold shell can be continuously increased along with the injection of the polyurethane slurry in the testing process until the set volume is reached, so that the good sealing property of the sealing unit is avoided to cause the data distortion caused by the air in the interior, and only the structure of part of the rheometer is shown in the drawing, and the hardware and software parts for data acquisition and setting are not described in detail, and the corresponding structure of the existing rotary rheometer can be adopted.

[0064] The sealing unit in the embodiment comprises an annular groove arranged on the side wall of the shear plate and a sealing ring arranged in the annular groove, and is sealed by structures such as a gasket, a ring tooth of a plurality of sealing teeth, etc. Alternatively, the sealing unit comprises a rubber sealing ring arranged on the inner wall of the top of the mold shell, and the rubber sealing ring is provided with annular sealing teeth, and the shear plate is provided with a gear ring engaged with the annular sealing teeth.

[0065] As preferred, the embodiment can also adopt the following structure: the sealing unit comprises a base 401 in the shape of a ring, assembly grooves 402, and a sealing body 403, a plurality of assembly grooves are arranged on the base, the assembly grooves are in the shape of a ring, and the assembly grooves are arranged in an inclined manner; the sealing body is arranged in each assembly groove in a matching manner, and the sealing body is in the shape of a truncated cone; a sealing head 404 inclined to the bottom of the mold shell is arranged at the outer end of the sealing body, and the sealing head is in close contact with the inner wall of the mold shell.

[0066] It also comprises a liquid injection cavity 405 arranged on the base, a liquid seal cavity 406 formed between adjacent two sealing bodies, a liquid seal branch 407 in communication between the liquid injection cavity and the liquid seal cavity, and a liquid injection port 408 arranged at the top of the liquid injection cavity; a stepped assembly table 409 is arranged on the shear plate, the base is arranged on the assembly table in a matching manner, and the assembly table and the base are connected and fixed by a bolt 410; a ring-shaped bearing table 411 is arranged at the lower part of the base, the ring-shaped bearing table corresponds to the lowermost sealing body, the ring-shaped bearing table is supported at the lower part of the corresponding sealing head 404, and the sealing body can be a rubber plate.

[0067] The slurry unit comprises liquid storage tanks 601 and grouting pumps 602, and the liquid storage tanks are at least two; each liquid storage tank is connected with a grouting hole through a grouting pump, and a one-way valve 611 is arranged at the front part of the grouting hole.

[0068] The grouting holes 301 are a plurality of holes arranged on the mold shell 300 in a circumferential uniform manner, and the slurry in each liquid storage tank 601 is injected into the mold shell through at least one corresponding grouting hole, and the countercurrent injection through a plurality of grouting holes realizes mixing, as shown in Figure 1 On the basis of the above structure, in order to further improve the mixing effect, another structure can also be adopted, that is, a mixer is arranged at the front part of the one-way valve, and each liquid storage tank is connected with the feed end of the mixer through a grouting pump; the mixer comprises a mixing shell 604 in the shape of a cylinder, a turbulence vane 605, and a cover plate 606, a tapered discharge port 609 is arranged at the first end of the mixing shell, a threaded section is arranged at the second end of the mixing shell, the cover plate 606 is arranged on the threaded section in a matching manner, at least two feed connectors 610 are arranged on the cover plate, a positioning sleeve 607 is fixed on the outer periphery of the turbulence vane, a corresponding clamping strip 608 and a clamping groove are arranged between the outer wall of the positioning sleeve and the inner wall of the mixing shell, and the turbulence vane 605 and the positioning sleeve 607 are arranged in the mixing shell 604 in a matching manner, as shown in Figure 3 and Figure 4As shown.

[0069] For the structural design of the mixer, on the one hand, the disturbance blades can mix the slurry in different liquid storage tanks and reduce the hindering effect on the slurry, and on the other hand, the mixer can be easily disassembled and washed to avoid residual liquid in the mixer.

[0070] In order to further improve the mixing efficiency and achieve efficient mixing, at least two grouting holes can be arranged on the shear plate 400, and the liquid storage tank 601 and the grouting pump 602 are arranged on the top of the shear plate 400. The slurry in each liquid storage tank 601 is injected into the mold shell 300 through at least one corresponding grouting hole. At this time, due to the high-speed rotation of the shear plate, the slurry in the grouting hole is distributed in the mold shell in a spiral line, so that the atomized slurry can fill the mold shell, and the self-expanding performance of the polyurethane is guaranteed. In order to further optimize the structure, the grouting holes on the shear plate can be inclined, thereby guaranteeing the full and uniform mixing. Figure 5 and Figure 6 As shown.

[0071] The application also provides a temperature control unit. A sink is arranged on the outer wall of the mold shell 300. The temperature control unit comprises a temperature control shell 701 arranged in the sink and an electric heating assembly arranged in the temperature control shell. The temperature in the mold shell is controlled by the electric heating assembly, so as to obtain the rheological performance parameters at different temperatures.

[0072] The rotary rheometer used in the embodiment is an instrument for researching and measuring the rheological properties of materials. It applies forced steady rate load, steady stress load, dynamic sinusoidal periodic strain load or dynamic sinusoidal periodic stress load to the sample, and observes the response data of the sample to the applied load. By measuring rheological data such as shear rate, shear stress, oscillation frequency and stress-strain amplitude, the viscosity, storage modulus, loss modulus and Tan δ of the sample can be calculated. It is the most widely used rheological measuring instrument in the field of materials, and can be used to study the flow and deformation characteristics of samples from low-viscosity fluids to high-strength solids. The shear plate in the application can be a flat plate or a cone plate.

[0073] The application also discloses a polyurethane rheological property testing method. The polyurethane rheological property testing device is used to test the rheological properties of polyurethane. The method comprises the following steps:

[0074] Assembling and connecting the components of the polyurethane rheological property testing device;

[0075] According to the preset polyurethane control parameters, the slurry injection amount and the rheometer action parameters are determined. The polyurethane control parameters include volume, temperature, pressure, sealing and other parameters. The rheometer action parameters include shear rate and test mode and other parameters.

[0076] Start the slurry unit to inject the slurry, and immediately turn off the switch of the injection pump after the injection is completed;

[0077] Start the rheometer action, test according to the set rheometer action parameters, and obtain the polyurethane rheological property data.

[0078] Since the mold shell is a sealed structure, the shear plate can be lowered to the bottom of the mold shell before grouting. When grouting starts, the shear plate is gradually raised until it reaches the set height, thereby ensuring a certain volume and meeting the requirements of the corresponding density.

[0079] Compared with the widely used polyurethane foam material, the two-component foaming polymer material has the same excellent performance as other polyurethane foams. The biggest feature of the two-component foaming polymer material is the huge expansion force generated during the reaction of the two components and the superior mechanical properties of the generated resin material. This is also an important factor for the wide application of polymer materials in transportation, construction, water conservancy and other engineering fields.

[0080] When the polymer is grouted, the huge expansion force can accelerate the consolidation of the soil, and at the same time, it does not increase the additional stress of the foundation, avoiding further deterioration of the foundation state. On the other hand, under the action of the huge expansion force, the foundation can be lifted, and the structure above can be corrected. When lifting the concrete slab of the road and airport, the accumulated water under the slab can be squeezed out to fill the void, and part of the crack can be filled, which can reduce or eliminate the influence of water damage on the foundation to some extent, and prolong the service life of the infrastructure.

[0081] The resistance encountered by the polymer material during the expansion process is inversely proportional to the increase in volume. This reaction is constrained by the surrounding soil and depends on the type of soil, and finally becomes a polymer with a certain density.

[0082] From the practice of grouting engineering, it is found that the estimated grouting amount is very important. If the grouting amount is too small, the grouting effect is not obvious, and if the grouting amount is too large, it is easy to cause the uplift damage of the soil. In order to more accurately control the filling, compaction, lifting and anti-seepage effects of grouting, it is very important to obtain the relationship between the grouting amount of the polymer material and the expansion force.

[0083] In fact, the expansion force generated by grouting is closely related to the grouting amount and the properties of the medium around the grouting point. Since the properties of the medium around the grouting point are complex, the expansion force generated by grouting is only related to the grouting amount, i.e. the density of the resin body formed after grouting, after assuming the properties of the medium around the grouting point. The greater the expansion force, the greater the density. However, no experimental data on the expansion force can be found at home and abroad. Therefore, it is of great engineering significance to study the relationship between the expansion force and the density, and to obtain the relationship between the expansion force of the high polymer material and the time and the density, which is helpful to the reasonable selection and improvement of the high polymer grouting construction process.

[0084] The present application can further analyze and study the performance changes in the polyurethane expansion process through the sealing design of the overall structure, the detection of the rheological properties, the pressure detection and the temperature control, and obtain more relevant data, so as to obtain better effects in the application process. Specifically, as shown in Figure 7 and Figure 8 , the three curves in Figure 7 are respectively the expansion force-time curves of three typical materials with different densities within 60 seconds. The test measures the growth rule of the expansion force in the container with time after the grouting starts, and finally measures the time required for the sample to reach the maximum expansion force. Figure 8 The relationship curve between the maximum expansion force of the sample and the density of the sample. The maximum expansion force of the sample will appear in the expansion process, and the maximum expansion force is an important parameter for filling the foundation pore and lifting the upper structure of the material.

[0085] The term "and / or" in this paper means that there can be three relationships. For example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in this paper generally means that the objects before and after are in an "or" relationship.

[0086] The preferred embodiments for implementing the present application have been described in detail above, but it should be understood that the functions of these embodiments are only for example, and do not limit the scope, application or structure of the present application in any way. The protection scope of the present application is defined by the appended claims and their equivalents. Those skilled in the art can make many changes to the foregoing embodiments under the teaching of the present application, and these changes all fall within the protection scope of the present application.

Claims

1. A polyurethane rheological property testing device, characterized in that, include: Base; A rheometer, wherein the lower part of the rheometer is provided with a rotating shaft corresponding to the base; A mold housing, which is disposed on the base, the top of the mold housing being open; as well as A shearing plate is disposed at the lower part of the rotating shaft, and the shearing plate is matched and disposed at the top of the mold housing, and a sealing unit is provided between the shearing plate and the side wall of the mold housing; The rotating shaft drives the shearing plate to rotate inside the mold housing, and the sealing unit is used to seal the top of the mold housing; a grouting hole is provided on the mold housing or the shearing plate, and the grouting hole is connected to a grouting unit; A limiting unit is provided between the base and the mold housing; The limiting unit is a polygonal boss and a polygonal groove respectively provided on the base and the mold housing; or / and the limiting unit is a connecting bolt provided between the base and the mold housing; A pressure table is provided on the base, the mold housing is placed on the pressure table, and a pressure sensor is provided between the pressure table and the base; the rotating shaft and the shearing plate are fixedly connected by bolts. A lifting unit is provided between the rheometer and the base. The lifting unit includes a guide column, a support plate, an upper plate and a power push rod. The guide column is located between the base and the upper plate. The rheometer is located on the support plate. The support plate is slidably mounted on the guide column. The power push rod drives the support plate to slide up and down along the guide column. The sealing unit includes an annular groove disposed on the side wall of the shearing plate and a sealing ring disposed in the annular groove; or the sealing unit includes a rubber sealing ring disposed on the inner wall of the top of the mold housing, with annular sealing teeth provided on the rubber sealing ring, and a toothed ring that meshes with the annular sealing teeth provided on the shearing plate. The sealing unit includes: A ring-shaped base; Assembly slots, multiple assembly slots formed on the base, the assembly slots being annular and inclined; and A sealing body is fitted into each of the assembly slots, and the sealing body is truncated cone-shaped; a sealing head inclined towards the bottom of the mold housing is provided at the outer end of the sealing body, and the sealing head is fitted and sealed against the inner wall of the mold housing; The sealing unit also includes a liquid injection chamber, which is disposed on the base. A liquid seal cavity is formed between two adjacent sealing bodies. The liquid injection chamber and the liquid seal cavity are connected by a liquid seal branch. A liquid injection port is provided at the top of the liquid injection chamber. The shearing plate is provided with a stepped assembly platform, the base is matched and disposed on the assembly platform, and the assembly platform and the base are fixedly connected by bolts; The lower part of the base is provided with an annular support platform, which corresponds to the sealing body located at the lowest side, and the annular support platform supports the lower part of the corresponding sealing head. The device further includes a temperature control unit, and a groove is provided on the outer wall of the mold housing. The temperature control unit includes a temperature control housing disposed in the groove and an electric heating component disposed in the temperature control housing. The grout unit includes a storage tank and a grouting pump, and there are at least two storage tanks; each storage tank is connected to a grouting hole via the grouting pump, and a one-way valve is provided at the front of the grouting hole. The grouting holes are a plurality of circumferentially distributed holes on the mold shell, and the grout in each storage tank is injected into the mold shell through at least one corresponding grouting hole; or The grouting holes are at least two arranged on the shear plate, and the storage tank and the grouting pump are both arranged on the top of the shear plate. The grout in each of the storage tanks is injected into the mold shell through at least one corresponding grouting hole; or It also includes a mixer, which is located in front of the one-way valve. Each of the liquid storage tanks is connected to the feed end of the mixer via a grouting pump. The mixer includes a cylindrical mixing shell, baffles, and a cover plate. The first end of the mixing shell is provided with a conical discharge port, and the second end of the mixing shell is provided with a threaded section. The cover plate is matched and disposed on the threaded section, and the cover plate is provided with at least two feed joints. A positioning sleeve is fixed to the outer periphery of the baffles. Corresponding retaining strips and grooves are provided between the outer wall of the positioning sleeve and the inner wall of the mixing shell. The baffles and the positioning sleeve are matched and disposed inside the mixing shell.

2. A method for testing the rheological properties of polyurethane, characterized in that, The polyurethane rheological property testing apparatus according to claim 1 is used to test the rheological properties of polyurethane, specifically including the following steps: The components of the polyurethane rheological property testing device are assembled and connected. Based on the preset polyurethane control parameters, determine the slurry injection volume and rheometer operating parameters; Start the grouting unit to perform grouting; Start the rheometer to acquire rheological performance data of polyurethane.

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