Preparation method and preparation system of adhesive test piece

Abstract

The invention provides a preparation method and a preparation system of an adhesive test piece for determining the adhesive property of an adhesive. Comprising the following steps: S1, establishing a corresponding relationship between the viscosity and time of the adhesive, taking the time for testing the viscosity for the first time after preparation raw materials of the adhesive are mixed as starting time, and taking a corresponding viscosity value as an initial viscosity value; s2, based on the corresponding relation in the step S1, the gluing time period or the gluing time point of the adhesive is determined; and S3, selecting a base material of an adhesive test piece, and preparing the adhesive test piece by adopting the adhesive time period or the adhesive time point determined in the step S2. By using the preparation method provided by the invention, the size, thickness and precision of the adhesive test piece are favorably controlled, the accuracy and stability of the adhesive performance test result are improved, the technical problem that the preparation effect and quality of the adhesive test piece are difficult to control is solved, the discreteness of the adhesive strength test result of the adhesive is reduced, and the product quality is improved. And the reproducibility of a test result of the bonding strength of the adhesive is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of material testing methods, and particularly relates to a preparation method and a preparation system for an adhesive test piece used for measuring the bonding performance of an adhesive. Background Art

[0002] Adhesives play a crucial role in modern engineering. The bonding technology is a process of using the physical action of adhesives or chemical reactions such as polymerization crosslinking to cure, obtain and improve bonding strength and other properties. It has the advantages of uniform stress distribution, firm and reliable joints, simple processing technology, lightweight, etc., and is widely used in new construction projects, road traffic, decoration, building sealing, renovation and reinforcement and other fields. During actual service, the bonded part will inevitably be subjected to stress loads. As one of the key raw materials, the bonding performance of adhesives directly affects the safety and reliability of the overall structure during service. Therefore, the accurate evaluation of its performance is becoming increasingly important.

[0003] The bonding strength refers to the stress required to cause failure at the interface between the adhesive and the adherend or in its vicinity in an adhesive test piece under the action of an external force. The bonding strength is also called the adhesive strength. According to the different stress conditions of the bonded joint, it can be classified into 4 forms: shear, tension, non-uniform peel and peel. The corresponding bonding strengths can be specifically divided into shear strength, tensile strength, non-uniform peel strength, peel strength, impact strength, fatigue resistance strength, etc. At present, the test methods for the bonding strength of adhesives can be carried out according to GB 50728-2011 "Technical Specification for Safety Appraisal of Engineering Structure Strengthening Materials", GB / T 7124-2008 "Determination of Tensile Shear Strength of Adhesives (Rigid Material to Rigid Material)", GB / T 6329-1996 "Determination of Tensile Strength of Adhesive Butt Joints", etc.

[0004] However, the magnitude of the bonding strength depends not only on the adhesive force, the mechanical properties of the adhesive, the joint form, the stress conditions (type, magnitude, direction, frequency), environmental factors (temperature, humidity, pressure, medium) and test conditions, but also on the properties of the adherend (curing degree, viscosity, pot life), bonding process and experimental techniques, etc. However, the preparation process of the adhesive test piece is not introduced in detail in the standards, nor are the relevant process parameters and preparation techniques clearly given.

[0005] During the actual detection process, the time control and preparation process during the preparation of the bonded specimen are mostly subjectively controlled by the operator. As time goes by, the curing degree, viscosity, and fluidity of the adhesive also change, resulting in a change in the bonding effect of the formed adhesive specimen. During the bonding process, when the viscosity of the adhesive is low, it is easy to flow out, resulting in problems such as voids on the bonding surface and uneven thickness that are difficult to control. When the viscosity of the adhesive is high, problems such as caking, bubbles, or defects and a decrease in adhesive force are likely to occur. Therefore, in the existing methods for preparing adhesive specimens, it is easy to cause the quality of the formed adhesive specimens to be difficult to control, and there are technical problems such as a high discreteness and poor reproducibility in the test results of the bonding strength of the adhesive, which in turn affects the accuracy and stability of the test results of the bonding strength of the adhesive. Summary of the Invention

[0006] In view of the deficiencies of the prior art, the present invention provides a method and system for preparing an adhesive specimen for measuring the bonding performance of an adhesive. The specific solutions are as follows:

[0007] One aspect of the present invention provides a method for preparing an adhesive specimen for measuring the bonding performance of an adhesive, including the following steps:

[0008] Step S1: Establish a correspondence between the viscosity and time of the adhesive, taking the time of the first viscosity measurement after the preparation raw materials of the adhesive are mixed as the starting time, and the corresponding viscosity value as the initial viscosity value;

[0009] Step S2: Based on the correspondence in Step S1, determine the adhesive period or adhesive time point of the adhesive;

[0010] Step S3: Select the base material of the adhesive specimen, and use the adhesive period or adhesive time point determined in Step S2 to prepare the adhesive specimen.

[0011] Further, Step S1 further includes:

[0012] Step S1-1: After the preparation raw materials of the adhesive are mixed, place them in a set temperature environment for temperature adjustment, and conduct the first viscosity measurement within 0-5 minutes. Use the rotational viscometer method to measure the viscosity;

[0013] Step S1-2: Preset the interval test time, conduct viscosity measurements at preset times, and record the viscosity values;

[0014] Step S1-3: Plot the viscosity-time curve of the adhesive.

[0015] Further, in Step S1-1, the temperature environment is a constant temperature water bath, and the temperature is 21°C to 25°C.

[0016] Furthermore, the time for temperature adjustment of each raw material component of the adhesive to be measured is not less than 24 hours.

[0017] Furthermore, in the step S2, the method for determining the gluing time period or gluing time point includes:

[0018] When the correspondence between the viscosity of the adhesive and time shows a trend of first decreasing and then increasing, the time point corresponding to the lowest viscosity value is taken as the gluing time point.

[0019] Furthermore, in the step S2, the method for determining the gluing time period or gluing time point includes:

[0020] When the correspondence between the viscosity of the adhesive and time shows a first stable or slow increase and then a sharp increase in viscosity value, the time period corresponding to the viscosity value that is 1.5 to 2 times the initial viscosity value of the adhesive is taken as the gluing time period.

[0021] Furthermore, in the step S2, the method for determining the gluing time period or gluing time point includes:

[0022] When the correspondence between the viscosity of the adhesive and time is irregular, the time period corresponding to the viscosity value that is 1.5 to 2 times the initial viscosity value of the adhesive is taken as the gluing time period.

[0023] Furthermore, the following steps are further included:

[0024] Step S4, stability test: Perform performance tests on the glued specimens prepared in step S3. For the glued specimens with excessively large deviations in the test results, analyze the differences by comparing the correspondence between the viscosity and time during the preparation process of the glued specimens and the failure forms of the glued specimens.

[0025] On the other hand, the present invention provides a preparation system for glued specimens for measuring the bonding performance of adhesives, and the system includes:

[0026] A test unit for establishing the correspondence between the viscosity of the adhesive and time, taking the time of the first viscosity test after the preparation raw materials of the adhesive are mixed as the starting time, and the corresponding viscosity value as the initial viscosity value;

[0027] An analysis unit for determining the gluing time period or gluing time point of the adhesive according to the established correspondence between the viscosity of the adhesive and time;

[0028] A unit for preparing glued specimens for preparing the substrate of the selected glued specimens according to the determined gluing time period or gluing time point.

[0029] The present invention provides a preparation method and a preparation system for an adhesive test piece used for measuring the bonding performance of an adhesive. By determining the correspondence between the viscosity of the adhesive and time, selecting the optimal adhesive time period or the optimal adhesive time point of the adhesive, and selecting a substrate suitable for preparing the adhesive test piece, an adhesive test piece is prepared in combination with the adhesive.

[0030] First, using the preparation method provided by the present invention, the preparation of the bonding test piece is scientifically guided by the viscosity parameter, that is, the appropriate adhesive time period or the adhesive time point of the adhesive is selected for the preparation of the adhesive test piece. It is beneficial to control the size, thickness and precision of the adhesive test piece, improve the accuracy and stability of the bonding performance test result, solve the technical problem that it is difficult to control the quality of the bonding test piece preparation effect, reduce the discreteness of the adhesive bonding strength test result, and improve the reproducibility of the adhesive bonding strength test result.

[0031] Second, the preparation method provided by the present invention has wide practicability and can be applied to the preparation of adhesive test pieces for bonding performance tests such as tensile performance, shear performance, peel performance, and non-uniform peel performance.

[0032] Third, based on the determined correspondence between the viscosity of the adhesive and time, the adhesive time can be accurately grasped, the operation efficiency of personnel can be improved, and at the same time, for this kind of adhesive, the preparation of the adhesive test piece can be based on this, greatly improving the preparation level and efficiency of the adhesive test piece.

[0033] Finally, by clarifying the viscosity, bonding time and process parameters of the adhesive, and using this as a guide, the traceability of the test can be effectively improved, the influence of factors such as different testers and different operations on the result can be avoided, and the stability and accurate reproducibility of the test can be improved. Description of the Drawings

[0034] Figure 1 is a flowchart of the preparation method for an adhesive test piece used for measuring the bonding performance of an adhesive according to the present invention;

[0035] Figure 2 is a schematic diagram of the viscosity-time characteristic curve in the preparation method of the present invention showing a trend of first decreasing and then increasing;

[0036] Figure 3 is a schematic diagram of the viscosity-time characteristic curve in the preparation method of the present invention showing a trend of first being stable or slowly increasing and then increasing sharply;

[0037] Figure 4 is a viscosity-time curve graph of the adhesive to be tested in Example 2;

[0038] Figure 5 is a physical diagram of the adhesive to be tested at different time points after mixing in Example 2;

[0039] Figure 6 It is the bar chart of the rigid-to-rigid tensile shear strength at different time points after the adhesives to be tested in Example 2 are mixed;

[0040] Figure 7 It is the viscosity-time curve graph of the adhesives to be tested in Example 3;

[0041] Figure 8 It is the physical diagram of the adhesives to be tested at different time points after being mixed in Example 3;

[0042] Figure 9 It is the bar chart of the rigid-to-rigid tensile shear strength at different times after the adhesives to be tested in Example 3 are mixed. Detailed implementation manners

[0043] Now, various implementation manners of the present invention will be described in detail. Its embodiments are illustrated in the drawings and described below. Although the present invention will be described in conjunction with the exemplary implementation manners of the present invention, it should be understood that this specification is not intended to limit the present invention to those exemplary implementation manners. On the other hand, the present invention is intended to cover not only the exemplary implementation manners of the present invention, but also various alternatives, modifications, equivalents, and other implementation manners, which may be included within the spirit and scope of the present invention defined by the appended claims.

[0044] Hereinafter, the exemplary implementation manners of the present invention will be described in detail with reference to the drawings. The specific structures and functions described in the exemplary implementation manners of the present invention are only for illustrative purposes. The implementation manners according to the concept of the present invention can be implemented in various forms, and it should be understood that they should not be construed as being limited by the exemplary implementation manners described in the exemplary implementation manners, but include all modifications, equivalents, or alternatives included in the spirit and scope of the present invention.

[0045] It should be understood that although terms such as "first", "second", etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, the first element discussed below may be referred to as the second element without departing from the teachings of the present invention. Similarly, the second element may also be referred to as the first element.

[0046] Throughout the specification, the professional terms used herein are only for describing various exemplary implementation manners and are not intended to be limiting. It will be further understood that terms such as "comprising", "including", "having", etc., when used in the exemplary implementation manners, specifically refer to the existence of the stated components, steps, operations, or elements, but do not exclude the existence or addition of one or more other components, steps, operations, or elements.

[0047] One aspect of the present invention provides a method for preparing an adhesive test piece for measuring the adhesive performance of an adhesive, comprising the following steps: Step S1, establishing the correspondence between the viscosity and time of the adhesive, taking the time of the first viscosity measurement after the preparation raw materials of the adhesive are mixed as the starting time, and the corresponding viscosity value as the initial viscosity value; Step S2, determining the adhesive period or adhesive time point of the adhesive based on the correspondence described in Step S1; Step S3, selecting the substrate of the adhesive test piece, and preparing the adhesive test piece using the adhesive period or adhesive time point determined in Step S2.

[0048] First of all, using the preparation method provided by the present invention, the preparation of the bonding test piece is scientifically guided by the viscosity parameter, that is, selecting the appropriate adhesive period or adhesive time point of the adhesive to prepare the adhesive test piece. It is beneficial to control the size, thickness and accuracy of the adhesive test piece, improve the accuracy and stability of the bonding performance test results, solve the technical problem that the preparation effect quality of the bonding test piece is difficult to control, reduce the discreteness of the adhesive bonding strength test results, and improve the reproducibility of the adhesive bonding strength test results.

[0049] Secondly, the preparation method provided by the present invention has wide practicability and can be applied to the preparation of adhesive test pieces for bonding performance tests such as tensile performance, shear performance, peel performance, and non-uniform peel performance.

[0050] Thirdly, based on the determined correspondence between the viscosity and time of the adhesive, the adhesive time can be accurately grasped, the operation efficiency of personnel can be improved, and at the same time, for this kind of adhesive, the preparation of the adhesive test piece can be based on this, greatly improving the sample preparation level and efficiency.

[0051] Finally, the viscosity, bonding time, and process parameters of the adhesive are clarified. Guided by this, the traceability of the test can be effectively improved, the influence of factors such as different testers and different operations on the results can be avoided, and the stability and accurate reproducibility of the test can be improved.

[0052] The operation details in each step are explained in detail below.

[0053] In a specific embodiment, the above Step S1 further includes:

[0054] Step S1-1, after the preparation raw materials of the adhesive are mixed, they are placed in a set temperature environment for temperature adjustment, and the first viscosity measurement is carried out within 0-5 minutes. The rotational viscometer method is used to measure the viscosity to obtain the initial viscosity value;

[0055] Step S1-2: Preset the interval test time, conduct viscosity tests at the preset time, and record the viscosity values. The interval test time can be selected from 5 min to 20 min, preferably 10 min for the interval test time. The preset time for conducting the viscosity test is set in combination with the curing time of the adhesive, preferably more than 60 min.

[0056] Step S1-3: Plot the viscosity-time curve of the adhesive.

[0057] In the rotational viscometer method, the rotational viscometer drives the rotor to rotate at a stable angular velocity through a motor, generating a uniform and stable shear rate in the adhesive, thereby achieving precise control of the shear rate. Equipped with high-precision sensors and advanced measurement technologies, it can accurately measure the resistance torque on the rotor, and then accurately calculate the viscosity of the adhesive, thus having the advantage of high measurement accuracy. In the rotational viscometer method, the required sample volume is small and the measurement is fast, thus having the advantage of simple operation. It can measure adhesives with different viscosity ranges and is applicable to various types of adhesives, including adhesives with Newtonian and non-Newtonian fluid characteristics, thus having the advantage of wide applicability. It can observe the dynamic viscosity change of the adhesive under continuous shear action, which is closer to the stress situation of the adhesive in actual use, thereby achieving dynamic observation and facilitating real-time monitoring.

[0058] In a specific embodiment, the capillary viscometer method can also be used to determine the correspondence between the viscosity and time of the adhesive. If the viscosity change of the adhesive is mainly caused by internal chemical reactions, such as polymerization reactions, cross-linking reactions, etc., a mathematical model can be established based on the principles of chemical reaction kinetics to determine the correspondence between the viscosity and time of the adhesive.

[0059] In a specific embodiment, the Brookfield software supporting the viscometer can be used. It can not only automatically collect the real-time data measured by the viscometer and quickly and accurately transmit it to a computer or other storage devices, facilitating subsequent data processing and analysis by the user. Moreover, it has rich data analysis and processing functions and can automatically generate the curve of the viscosity of the adhesive changing with time, that is, the viscosity-time curve of the adhesive. There is no need for programming and it can be used out of the box, reducing the error rate caused by the manual drawing method and improving the efficiency of drawing the curve at the same time.

[0060] It should be noted that using the viscosity-time curve is only one form for expressing the correspondence between the viscosity and time of the adhesive. The curve expression has the advantage of being more intuitive. In a specific embodiment, a table expression form can also be used.

[0061] In a specific embodiment, the adhesive to be tested is an epoxy structural adhesive product. In step S1-1, the temperature environment is a constant temperature water bath with a temperature of 21°C to 25°C, and the temperature adjustment time for each raw material component of the adhesive to be tested is not less than 24 hours.

[0062] It should be noted that the types of adhesives to be tested are not limited to epoxy structural adhesive products, and can be extended to silicone adhesives, polyurethane adhesives, epoxy resin adhesives, polyacrylate adhesives, synthetic adhesives, etc. The application fields can involve adhesives for construction projects, adhesives for the wind power industry, adhesives for the automotive industry, adhesives for electronic appliances, adhesives for photovoltaics, etc.

[0063] Through the above steps and limiting conditions, when using the rotational viscometer method to measure the bonding strength of the adhesive to be tested, it is possible to minimize the influence of external environmental factors such as temperature, provide better test conditions, and enable the adhesive to be tested to be in the best working state.

[0064] In a specific embodiment, in step S2, the method for determining the adhesive bonding time period or time point includes: when the correspondence between the viscosity of the adhesive and time shows a trend of first decreasing and then increasing, the time point corresponding to the lowest viscosity value is taken as the adhesive bonding time point; when the correspondence between the viscosity of the adhesive and time shows a first stable or slow increase and then a sharp increase in viscosity value, the time period corresponding to a viscosity value that is 1.5 to 2 times the initial viscosity value of the adhesive is taken as the adhesive bonding time period; when the correspondence between the viscosity of the adhesive and time is irregular, the time period corresponding to a viscosity value that is 1.5 to 2 times the initial viscosity value of the adhesive is taken as the adhesive bonding time period.

[0065] The present invention analyzes the test results from three aspects. The test results include (1) bonding ability, the magnitude of the force value; (2) the discreteness of the bonding test results; (3) the failure morphology of the adhesive test specimens, such as the fullness of the adhesive layer and the degree of defects. Based on the comprehensive analysis of multiple test results, a method for determining the adhesive bonding time period or time point is obtained. Based on multiple tests of the same adhesive product, under the condition that other conditions are the same, it is preferred to select (1) the one with a large bonding force; (2) the one with a small discreteness; (3) in terms of the failure morphology, it is preferred to select the one with fewer defects such as air pockets and lack of glue.

[0066] Through the above method, after determining the correspondence between the viscosity and time of the adhesive in step S1, it is possible to quickly and accurately select the appropriate adhesive application time period or time point for the adhesive. On this basis, a substrate suitable for preparing the adhesive specimen is selected, and the adhesive specimen formed by combining the adhesive is conducive to controlling the size, thickness, and accuracy of the adhesive specimen, improving the accuracy and stability of the bonding performance test results, solving the technical problem that it is difficult to control the quality of the preparation effect of the bonded specimen, reducing the discreteness of the adhesive bonding strength test results, and improving the reproducibility of the adhesive bonding strength test results.

[0067] In a specific embodiment, the following steps are further included: Step S4, perform a performance test on the adhesive specimen prepared in step S3. If there are problems such as ambiguity or excessive deviation in the test results, the correspondence between the viscosity and time in step S1 can be combined, and the failure mode of the adhesive specimen can be compared to analyze the differences.

[0068] The following introduces the above method for preparing an adhesive specimen for measuring the bonding performance of an adhesive of the present application through specific examples.

[0069] Example 1

[0070] According to Figure 1 , this example provides a method for preparing an adhesive specimen for measuring the bonding performance of an adhesive. The adhesive to be tested is taken as an epoxy structural adhesive product, and the steps of this method are as follows:

[0071] Step S1, establish the correspondence between the viscosity and time of the adhesive. Take the time when the viscosity is first measured after the preparation raw materials of the adhesive are mixed as the starting time, and the corresponding viscosity value as the initial viscosity value;

[0072] Step S1-1, use the rotational viscometer method to test the viscosity of the adhesive:

[0073] 1) Place the components of the epoxy structural adhesive product to be tested at a temperature of 21°C to 25°C for state adjustment for at least 24 hours. Weigh a certain amount of components A and B according to the ratio of the epoxy structural adhesive product and mix them quickly and evenly.

[0074] 2) Immediately pour the fully mixed adhesive into a beaker and place it in a thermostatic water bath with the temperature adjusted in advance, keeping the water bath temperature at 21°C to 25°C. Use a rotational viscometer to test the viscosity of the adhesive. Take the time of the first viscosity test at the 2-minute time point after mixing as the starting time, and this test value as the starting viscosity.

[0075] 3) Preset the interval test time, conduct interval tests according to the expected operable time, and record the viscosity values of the adhesive in each test. Since the number of tests and the mixing intensity affect both the curing degree and viscosity of the adhesive, during the interval time, stop stirring, and select an appropriate rotor and rotation speed according to the viscosity change and the instrument range throughout the test process.

[0076] 4) Plot the viscosity-time curve of the adhesive.

[0077] 5) Step S2: Based on the corresponding relationship described in step S1, select an appropriate adhesive bonding time period or bonding time point for the adhesive:

[0078] Refer to Figure 2 , when the corresponding relationship between the viscosity and time of the adhesive shows a trend of first decreasing and then increasing, use the time point corresponding to the lowest viscosity value as the bonding time point;

[0079] Refer to Figure 3 , when the corresponding relationship between the viscosity and time of the adhesive shows a first stable or slow increase, and then a sharp increase in viscosity, use the time period corresponding to a viscosity value of 1.5 - 2 times the initial viscosity value of the adhesive as the bonding time period;

[0080] When the corresponding relationship between the viscosity and time of the adhesive is irregular, use the time period corresponding to a viscosity value of 1.5 - 2 times the initial viscosity value of the adhesive as the bonding time period.

[0081] 6) Step S3: Select a substrate suitable for preparing the bonded specimen, and combine the adhesive to prepare the bonded specimen during the bonding time period or bonding time point described in step S2.

[0082] 7) Step S4: Conduct performance tests on the bonded specimen prepared in step S3. If there are problems such as ambiguity or excessive deviation in the test results, the difference can be analyzed by combining the corresponding relationship between viscosity and time described in step S1 and comparing the failure form of the bonded specimen.

[0083] Specific comparative examples will be provided below to compare and verify the effectiveness of the preparation method of the bonded specimen for measuring the bonding performance of the adhesive in this application.

[0084] Example 2

[0085] Based on the preparation method of Example 1, select a certain domestic building epoxy steel-bonding adhesive to prepare a bonded specimen. As Figures 4 - 6As shown, the "viscosity - time" characteristic curve of the building epoxy steel - bonding adhesive was tested, and its pot life (before the blue dashed line) was marked. Through analysis, it can be seen that the corresponding relationship between the viscosity of the adhesive and time first decreases and then increases. The lowest viscosity value of the steel - bonding adhesive appears around 40 minutes in the middle of the pot life, that is, the optimal adhesive time can be 40 minutes. Through the comparative analysis of the steel - to - steel tensile shear strength of the adhesive specimens prepared with the tested adhesive at time points of 20 minutes, 40 minutes, and 60 minutes respectively, among the prepared adhesive specimens, the steel - to - steel tensile shear strength of the adhesive specimens prepared with the tested adhesive at 40 minutes is the strongest. Selecting the optimal adhesive time point is beneficial to the preparation of adhesive specimens, and completing the specimen preparation at this time is also beneficial to the stable and effective progress of the subsequent rapid curing reaction.

[0086] Example 3

[0087] Based on the preparation method of Example 1, this example selects a certain foreign - produced building epoxy impregnating adhesive to prepare bonding specimens. As Figures 7 - 9 shown, the "viscosity - time" characteristic curve of the building epoxy impregnating adhesive was tested, and its pot life (before the blue dashed line) was marked. Through analysis, it can be seen that the corresponding relationship between the viscosity of the adhesive and time first shows a relatively stable or slow increase, and after a period of time, the viscosity of the adhesive increases sharply. The time period corresponding to the viscosity value that is 1.5 - 2 times the initial viscosity value of the adhesive is the optimal adhesive time period. Combining with the curve, at 1.5 times the initial viscosity, that is, from 100 minutes to 110 minutes at the end of the pot life, is the optimal adhesive time period, with a slight increase in viscosity, taking into account both the curing reaction and operability of the adhesive. Through the comparative analysis of the steel - to - steel tensile shear strength of the adhesive specimens prepared with the tested adhesive at time points of 20 minutes, 60 minutes, 100 minutes, and 140 minutes respectively, among the prepared adhesive specimens, the steel - to - steel tensile shear strength of the adhesive specimens prepared with the tested adhesive at 100 minutes is the strongest. Selecting the optimal adhesive time point is beneficial to the preparation of adhesive specimens, and completing the specimen preparation at this time is also beneficial to the stable and effective progress of the subsequent rapid curing reaction.

[0088] Example 4

[0089] This example provides a preparation system for adhesive specimens used to measure the bonding performance of adhesives. The system includes:

[0090] A testing unit, used to determine the corresponding relationship between the viscosity of the adhesive and time, with the time when the adhesive is prepared after being uniformly mixed as the starting time and the corresponding viscosity value as the initial viscosity value;

[0091] An analysis unit, configured to select an optimal adhesive bonding time period or an optimal adhesive bonding time point of the adhesive according to the determined corresponding relationship between the viscosity and time of the adhesive;

[0092] A unit for preparing an adhesive specimen, configured to select a substrate suitable for preparing the adhesive specimen according to the selected optimal adhesive bonding time period or optimal adhesive bonding time point, and prepare the adhesive specimen by combining the adhesive.

[0093] The preparation system of the present invention can stably operate the above method of the present invention, so as to realize the preparation of an adhesive specimen for measuring the adhesive bonding performance of an adhesive.

[0094] The foregoing description of specific exemplary embodiments of the present invention has been presented for purposes of illustration and description. It is not intended to be exhaustive or to limit the invention to the precise forms disclosed, and obviously, many modifications and variations are possible in light of the above teachings. The exemplary embodiments were chosen and described to explain certain principles of the invention and their practical application so that others skilled in the art may make and utilize various exemplary embodiments of the invention, as well as various alternatives and modifications thereof. The intention is that the scope of the invention be defined by the claims appended hereto and their equivalents.

[0095] It can be understood that the above embodiments are merely exemplary embodiments adopted to illustrate the principles of the present invention, and the present invention is not limited thereto. For those of ordinary skill in the art, various modifications and improvements can be made without departing from the spirit and essence of the present invention, and these modifications and improvements are also regarded as the protection scope of the present invention.

Claims

1. A method for preparing an adhesive specimen for measuring the adhesive performance of an adhesive, characterized in that, It includes the following steps: Step S1: Establish the correspondence between the viscosity and time of the adhesive. Take the time of the first viscosity test after the preparation raw materials of the adhesive are mixed as the starting time, and the corresponding viscosity value as the initial viscosity value; Step S2: Based on the correspondence described in Step S1, determine the adhesive period or adhesive time point of the adhesive; Step S3: Select the substrate of the adhesive test piece, and use the adhesive period or adhesive time point determined in Step S2 to prepare the adhesive test piece.

2. The preparation method of the adhesive specimen according to claim 1, characterized in that, Step S1 further includes: Step S1-1: After the preparation raw materials of the adhesive are mixed, place them in a set temperature environment for temperature adjustment, and conduct the first viscosity test within 0-5 minutes to obtain the initial viscosity value; Step S1-2: Preset the interval test time, conduct viscosity tests at preset times, and record the viscosity values at the corresponding time points; Step S1-3: Plot the viscosity-time curve of the adhesive.

3. The preparation method of the adhesive specimen according to claim 2, wherein, In Step S1-1, the temperature environment is a constant temperature water bath, and the temperature is 21°C - 25°C.

4. The preparation method of the adhesive specimen according to claim 3, characterized in that, The temperature adjustment time of each raw material component of the adhesive to be tested is not less than 24 hours.

5. The preparation method of the adhesive test piece according to claim 1, characterized in that, In Step S2, the methods for determining the adhesive period or adhesive time point include: When the correspondence between the viscosity and time of the adhesive shows a trend of first decreasing and then increasing, take the time point corresponding to the lowest viscosity value as the adhesive time point.

6. The preparation method of the adhesive specimen according to claim 1, characterized in that, In Step S2, the methods for determining the adhesive period or adhesive time point include: When the correspondence between the viscosity and time of the adhesive shows a first stable or slow increase, and then a sharp increase in viscosity, take the time period corresponding to the viscosity value of 1.5 - 2 times the initial viscosity value of the adhesive as the adhesive period.

7. The method for preparing an adhesive specimen according to claim 1, wherein In Step S2, the methods for determining the adhesive period or adhesive time point include: When the correspondence between the viscosity and time of the adhesive is irregular, take the time period corresponding to the viscosity value of 1.5 - 2 times the initial viscosity value of the adhesive as the adhesive period.

8. The preparation method of the adhesive test piece according to claim 1, wherein, It also includes the following steps: Step S4: Stability test, conduct performance tests on the adhesive test piece prepared in Step S3.

9. A preparation system for adhesive specimens used to measure the bonding performance of adhesives, characterized in that, The system includes: A test unit, used to establish the correspondence between the viscosity and time of the adhesive. Take the time of the first viscosity test after the preparation raw materials of the adhesive are mixed as the starting time, and the corresponding viscosity value as the initial viscosity value; An analysis unit, used to determine the adhesive period or adhesive time point of the adhesive according to the established correspondence between the viscosity and time of the adhesive; A unit for preparing an adhesive test piece, used to prepare the substrate of the selected adhesive test piece according to the determined adhesive period or adhesive time point.

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