CN114295544A - Soft substrate coating adhesion performance testing device and characterization method - Google Patents
Soft substrate coating adhesion performance testing device and characterization method Download PDFInfo
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- CN114295544A CN114295544A CN202111632358.2A CN202111632358A CN114295544A CN 114295544 A CN114295544 A CN 114295544A CN 202111632358 A CN202111632358 A CN 202111632358A CN 114295544 A CN114295544 A CN 114295544A
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Abstract
The invention discloses a device for testing the adhesion performance of a soft substrate coating and a characterization method. The device for testing the adhesion performance of the soft substrate coating comprises a container, an air bag bracket and an inflatable air bag arranged in the air bag bracket; the periphery of the air bag bracket is closed, and mounting holes for the tubular matrix to be tested to penetrate through are respectively formed in the top and the bottom of the air bag bracket; the inflatable and deflatable air bag expands and deforms inwards from the peripheral side of the air bag support to surround and extrude the peripheral side surface of the tubular base body to be detected; the container is internally provided with a liquid medium which can be filled between the inflatable and deflatable air bag and the tubular matrix to be tested. The device can truly simulate the actual application scene of the tubular matrix to be tested, and the authenticity and the reliability of the test are improved. The characterization method of the adhesion performance of the matrix outer coating based on the device can be used for characterizing a parameter K of the adhesion performancefCharacterizing the adhesion properties of the outer coating of the substrate, KfThe device is not influenced by the size parameters of the tubular matrix to be tested and the device, and is suitable for evaluating various tubular matrixes to be tested.
Description
Technical Field
The invention relates to the field of mechanical property testing of medical instruments, in particular to a device for testing the adhesion property of a soft substrate coating. The device is used for testing the adhesion performance of the soft matrix coating.
Background
Interventional medical consumables such as catheters and venous catheters are widely used, and in clinical practice, in order to reduce poor medical experience of patients, a method of attaching an ultra-smooth coating to the surface of a catheter is generally adopted to increase the smoothness of movement of the catheter in a human body.
Based on the above uses of interventional medical consumables, in order to ensure the reliability of the combination of the soft substrate coating and the substrate of the interventional medical consumables during the use process, the adhesive force of the soft substrate coating needs to be effectively evaluated.
At present, the following two methods are widely adopted for testing the adhesion of the soft substrate coating: the first method uses a cross-hatch method to represent the quality grade of the coating, needs to directly damage the soft matrix coating and is not suitable for interventional medical consumables with uneven surfaces; the second method is to test the adhesive force of the coating by adopting a reciprocating abrasion test, positive pressure needs to be applied to the interventional medical supplies and the soft substrate coating by a plate-shaped clamp during the test, if the interventional medical supplies are in non-planar structures such as a tubular structure and the like, the interventional medical supplies can be subjected to the positive pressure to radially generate large uneven deformation, the real contact state of the interventional medical supplies and a human body cannot be simulated, and the real adhesive force condition of the soft substrate coating cannot be obtained.
Disclosure of Invention
The invention aims to provide a device for testing the adhesion performance of a soft substrate coating, which can apply uniform and stable positive pressure to the peripheral side surface of a tubular substrate to be tested, and can simulate the actual application scene of the tubular substrate to be tested more truly and reliably, so that the adhesion performance of the substrate outer coating on the surface of the tubular substrate to be tested is obtained. The invention also aims to provide a characterization method of the adhesion performance of the soft matrix coating, and the adhesion performance testing device of the soft matrix coating is applied.
In order to achieve the purpose, the invention provides a device for testing the adhesion performance of a soft substrate coating, which comprises a container, an air bag bracket fixed in the container and an inflatable and deflatable air bag arranged in the air bag bracket; the periphery of the air bag support is closed, and mounting holes for the tubular base body to be tested to penetrate through are formed in the top and the bottom of the air bag support respectively; any one mounting hole is used for being separated from the tubular base body to be tested so as to realize the shuttling of the tubular base body to be tested relative to the air bag support; the inflatable and deflatable air bag is expanded and deformed inwards from the peripheral side of the air bag bracket so as to surround and extrude the peripheral side surface of the tubular base body to be detected; and a liquid medium which can be filled between the inflatable and deflatable air bag and the tubular matrix to be tested is arranged in the container.
Preferably, the balloon stent is in the shape of a circular tube; the inflatable and deflatable balloon comprises a cylindrical balloon membrane; the axial middle part of the cylindrical air bag film is sleeved on the air bag bracket; and the two axial ends of the cylindrical air bag film are turned and fixed outside the two axial ends of the air bag bracket in a sealing manner.
Preferably, two axial ends of the air bag bracket are respectively sleeved with an end cover; a first sealing gasket and a second sealing gasket which are tightly attached to two sides of the cylindrical air bag film are arranged between any end cover and the axial end face of the air bag bracket; an elastic ring tightly tightened on the periphery of the cylindrical airbag membrane is arranged between the end cover and the outer peripheral surface of the axial end part of the airbag support; the periphery of the air bag support is provided with an annular groove for the elastic ring to be embedded and positioned.
Preferably, the container is a transparent cup body with scales on the surface.
Preferably, the inflatable and deflatable balloon is connected with an air pump and an air pressure gauge.
Preferably, a tensile testing machine is further included; the tensile testing machine is provided with an upper clamping head used for clamping and pulling the tubular base body to be tested to shuttle relative to the air bag support.
Preferably, the top of the container is open; the bottom of the container is provided with a height adjusting device.
The invention also provides a characterization method of the soft substrate coating adhesion performance, which is applied to the soft substrate coating adhesion performance testing device and comprises the following steps:
s1: the inflatable and deflatable air bag with the internal pressure P is clamped on the periphery of the axial middle part of the tubular base body to be measured by force FeDrawing the tubular matrix to be detected to move at a uniform speed along the axial direction of the tubular matrix to be detected, and obtaining the contact area pi DL of the inflatable and deflatable air bag and the tubular matrix to be detected0And a relative sliding distance L;
s2: according to said force FeEstablishing an adhesion performance characterization parameter K for the internal pressure P and the contact areaf(ii) a Wherein the content of the first and second substances,
s3: analyzing said adhesion Performance characterizing parameter KfAnd determining the adhesion performance of the matrix outer coating of the tubular matrix to be detected along with the change rule of the relative sliding distance L.
Preferably, the step S1 includes:
s11: inflating the inflatable and deflatable air bag until the inflatable and deflatable air bag is close to the outer peripheral surface of the tubular base body to be detected;
s12: adding a liquid medium to the vessel to a level below and adjacent to the top surface of the inflatable and deflatable bladder;
s13: and inflating the inflatable and deflatable air bag until the internal pressure of the inflatable and deflatable air bag is P so as to enable the inflatable and deflatable air bag to be attached to the outer peripheral surface of the tubular base body to be measured.
Preferably, the adhesion properties in the step S3 include adhesion, adhesion uniformity, and coating smoothness.
Compared with the background technology, the device for testing the adhesion performance of the soft substrate coating comprises a container, an air bag bracket fixed in the container and an inflatable and deflatable air bag arranged in the air bag bracket; wherein, a liquid medium which can be filled between the inflatable and deflatable air bag and the tubular matrix to be tested is arranged in the container.
In the device for testing the adhesion performance of the soft matrix coating, the periphery of an air bag support is closed, and the top and the bottom of the air bag support are respectively provided with a mounting hole for a tubular matrix to be tested to penetrate through; the aperture of any mounting hole is larger than the radial dimension of the tubular base body to be measured, therefore, when the tubular base body to be measured penetrates through the mounting holes at the top and the bottom of the air bag bracket, only the inflatable and deflatable air bag which is inflated and expanded surrounds and extrudes the peripheral side surface of the tubular base body to be measured, the mounting hole and the tubular base body to be measured are separated from each other, and no acting force exists between the mounting hole and the tubular base body to be measured.
When the soft substrate coating adhesion performance testing device is used for testing the adhesion performance of the substrate outer coating of the tubular substrate to be tested, firstly, the tubular substrate to be tested penetrates into the air bag support from the mounting holes at the top and the bottom of the air bag support, the inflatable and deflatable air bag in the air bag support is restrained by the air bag support and can only expand and deform inwards from the peripheral side of the air bag support, and finally, the peripheral side surface of the tubular substrate to be tested, namely the outer tube wall, is surrounded and extruded to complete the installation in the device; and secondly, drawing the tubular matrix to be tested to move in a shuttling mode along the mounting hole, enabling the tubular matrix to be tested to move relative to the inflatable and deflatable air bag, and carrying out matrix outer coating test operation on the tubular matrix to be tested. And analyzing the characteristics of the matrix outer coating of the tubular matrix to be tested according to the data acquired by the matrix outer coating test operation.
Therefore, when the device for testing the adhesion performance of the soft substrate coating is used for testing the outer coating of the substrate, on one hand, the mode that the inflatable air bag applies pressure to the tubular substrate to be tested accords with the tubular characteristic of the tubular substrate to be tested, the annular pressure can be applied to the tubular substrate to be tested, the radial deformation of the tubular substrate to be tested under the confining pressure is extremely small, the change of the adhesion performance of the coating cannot be caused, and therefore the influence of the difference of the testing conditions and the interference of human factors on the testing result is avoided; on the other hand, the device for testing the adhesion performance of the soft substrate coating and the liquid medium in the device can truly simulate the actual application scene of the tubular substrate to be tested, and can more flexibly and accurately test the adhesion performance of the substrate outer coating in different environments. In addition, the device for testing the adhesion performance of the soft substrate coating can test, analyze and judge the adhesion performance of the substrate outer coating without damaging the substrate outer coating of the tubular substrate to be tested, thereby reducing the test cost.
The invention also provides a characterization method of the adhesion performance of the soft matrix coating, which is suitable for characterizing the soft coating adhesion of the tubular soft matrix sample, the characterization result is not influenced by the internal pressure P, the material and the size of the tubular matrix to be tested, and the method can be used for characterizing whether the coating on the outer surface of the tubular matrix to be tested is uniformly adhered, stripped and the like; and can also be used for characterizing the coating smoothness of the outer surface coating under different coating processes.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a device for testing the adhesion performance of a soft substrate coating according to an embodiment of the present invention;
FIG. 2 is a schematic view of a partial structure of a soft substrate coating adhesion performance testing apparatus at a position of an inflatable/deflatable balloon and a balloon stent according to an embodiment of the present invention;
FIG. 3 is a data analysis diagram obtained after the testing operation is performed by using the device for testing the adhesion of a soft substrate coating according to the embodiment of the present invention;
fig. 4 is a schematic flow chart of a method for characterizing the adhesion performance of a soft substrate coating according to an embodiment of the present invention.
The device comprises a tubular base body to be tested, a 02-tensile testing machine, a 1-container, a 2-inflatable and deflatable air bag, a 3-air bag support, a 4-air pump, a 5-air pressure meter, a 6-mounting hole, a 7-end cover, an 8-first sealing gasket, a 9-second sealing gasket, a 10-elastic ring, a 11-height adjusting device, a 111-adapter flange, a 112-adjusting rod, a 113-lower locking nut, a 114-upper locking nut, a 12-support bolt, a 13-air pump sealing element, a 14-air inlet nozzle and a 15-air pressure meter sealing element.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order that those skilled in the art will better understand the disclosure, the invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1 to 4, fig. 1 is a schematic structural diagram of a device for testing adhesion performance of a soft substrate coating according to an embodiment of the present invention; FIG. 2 is a schematic view of a partial structure of a soft substrate coating adhesion performance testing apparatus at a position of an inflatable/deflatable balloon and a balloon stent according to an embodiment of the present invention; FIG. 3 is a data analysis diagram obtained after the testing operation is performed by using the device for testing the adhesion of a soft substrate coating according to the embodiment of the present invention; fig. 4 is a schematic flow chart of a method for characterizing the adhesion performance of a soft substrate coating according to an embodiment of the present invention.
The invention provides a device for testing the adhesion performance of a soft substrate coating, which comprises a container 1, an inflatable and deflatable air bag 2 arranged in the container 1 and a liquid medium arranged between the inflatable and deflatable air bag 2 and a tubular substrate 01 to be tested.
The periphery of the air bag support 3 is closed, and the top and the bottom of the air bag support 3 are respectively provided with a mounting hole 6 for the tubular matrix 01 to be tested to penetrate through, so that the tubular matrix 01 to be tested can move back and forth relative to the air bag support 3 when being pulled along the mounting hole 6. The aperture of the mounting hole 6 is larger than the pipe diameter of the tubular matrix 01 to be tested, and in the test process, the mounting hole 6 is separated from the surface of the tubular matrix 01 to be tested, so that the test structure for the adhesion performance of the matrix outer coating is prevented from being influenced. Wherein the air bag bracket 3 can be suspended and positioned in the container 1 through a bracket bolt 12.
The inflatable and deflatable balloon 2 is provided in the balloon stent 3, and the inflatable and deflatable balloon 2 is inflated and deformed from the peripheral side of the balloon stent 3 to the inner center of the balloon stent 3 under the shape and structure constraint of the balloon stent 3. Once the inflatable and deflatable air bag 2 is inflated to be tightly attached to the tubular substrate 01 to be measured, the inflatable and deflatable air bag 2 surrounds and extrudes the peripheral side surface, namely the outer tube wall, of the tubular substrate 01 to be measured, so that uniform annular pressure is applied to the outer tube wall of the tubular substrate 01 to be measured.
It should be emphasized that the inflatable and deflatable airbag 2 is arranged around the circumference of the tubular substrate 01 to be tested, which means that the outer surface of the inflatable and deflatable airbag 2 is attached to the circumference of the tubular substrate 01 to be tested in all directions, for example, the shape of the inflatable and deflatable airbag 2 can be similar to a life buoy, and the tubular substrate 01 to be tested is equivalent to a pipe column inserted from the center of the life buoy.
The above-mentioned air bag support 3 and inflatable and deflatable air bag 2 are both arranged in the container 1, so that when the tubular substrate 01 to be tested is inserted into the air bag support 3 and the inflatable and deflatable air bag 2, the tubular substrate is also inserted into the container 1 filled with the liquid medium, so that the liquid medium in the container 1 can enter the air bag support 3 through the mounting hole 6 of the air bag support 3, and thus the tubular substrate 01 to be tested and the inflatable and deflatable air bag 2 can be filled between the inflatable and deflatable air bag. The liquid medium can simulate the liquid such as body fluid, tissue fluid and the like in a human body, so that the soft substrate coating adhesion performance testing device can truly simulate the practical application scene of the tubular substrate 01 to be tested, and the authenticity and reliability of the testing result of the device are improved.
The device for testing the adhesion performance of the soft substrate coating can be used for testing the adhesion performance of the substrate outer coating of the tubular substrate 01 to be tested. During testing, the tubular matrix 01 to be tested is inserted into the container 1, the air bag support 3 and the inflatable and deflatable air bag 2, the inflatable and deflatable air bag 2 is arranged around the tubular matrix 01 to be tested, the pressure which is actually balanced and stable in any direction in the circumferential direction of the tubular matrix 01 to be tested after inflation is carried out, and the adhesion performance of the matrix outer coating is analyzed and judged by means of the stress characteristic of the tubular matrix 01 to be tested under the pressure.
The above is only briefly described with respect to the usage of the device for testing the adhesion performance of the soft substrate coating, and as to the specific operation method and the method for analyzing and judging the adhesion performance of the substrate overcoat, the explanation and description made below in the characterization method of the adhesion performance of the substrate overcoat can be referred to.
The device for testing the adhesion performance of the soft matrix coating is used for testing the adhesion performance of the matrix outer coating of the tubular matrix 01 to be tested, on one hand, the mode that the inflatable air bag 2 applies pressure to the tubular matrix 01 to be tested conforms to the tubular characteristic of the tubular matrix 01 to be tested, the test result of the tubular matrix 01 to be tested is ensured to be less interfered by human factors, and the device can be suitable for the tubular matrix 01 to be tested with a non-smooth surface; on the other hand, the inflatable and deflatable air bag 2 and the liquid medium between the tubular substrate 01 to be measured and the inflatable and deflatable air bag 2 can truly simulate the actual application scene of the tubular substrate 01 to be measured. Obviously, the adhesion performance of the base body outer coating under different environments can be tested more flexibly and accurately by replacing the liquid medium.
In addition, the device for testing the adhesion performance of the soft substrate coating can test, analyze and judge the adhesion performance of the substrate outer coating without damaging the substrate outer coating of the tubular substrate 01 to be tested, thereby reducing the testing cost.
The following will further describe the device for testing the adhesion performance of a soft substrate coating provided by the present invention with reference to the accompanying drawings and embodiments.
In the device for testing the adhesion performance of the soft substrate coating provided by the invention, the air bag bracket 3 can be arranged in a circular tube shape, for example, the air bag bracket 3 comprises a closed cylindrical surface and circular plates fixed at the two axial ends of the cylindrical surface; the center of any circular plate is provided with a through mounting hole 6. Aiming at the circular tubular air bag bracket 3, the inflatable and deflatable air bag 2 can comprise a cylindrical air bag film, and the axial middle part of the cylindrical air bag film is sleeved on the air bag bracket 3; the two axial ends of the cylindrical air bag film are turned and fixed outside the two axial ends of the air bag bracket 3 in a sealing way. At this time, a sealed cavity is formed between the inner surface of the circumferential side of the airbag support 3 and the outer surface of the circumferential side of the tubular airbag membrane, when the sealed cavity is inflated, the tubular airbag membrane is restrained by the shape structure of the airbag support 3, the tubular airbag membrane is mainly expanded towards the direction close to the tubular substrate 01 to be tested, the subsequent operation is facilitated, and the deformed shape of the tubular airbag membrane can be controlled to ensure the length L of the tubular airbag membrane to the tube testing section of the tubular substrate 01 to be tested in the length L0Pressure is applied.
Further, the soft substrate coating adhesion performance testing device further comprises end covers 7, such as an upper end cover and a lower end cover, which are fixedly sleeved on the two axial ends of the air bag support 3. When the two axial ends of the tubular air bag membrane are rolled outside the two axial ends of the air bag support 3, the two axial ends of the air bag support 3 are respectively sleeved with the two end covers 7, so that the two axial ends of the tubular air bag membrane are respectively clamped and positioned between the air bag support 3 and any one end cover 7.
In addition, because the working pressure in the sealing cavity is larger than the atmospheric pressure, in order to ensure the sealing performance of the sealing cavity between the air bag support 3 and the cylindrical air bag membrane and avoid slow air leakage of the sealing cavity, a first sealing gasket 8 and a second sealing gasket 9 are arranged between any one end cover 7 and the axial end face of the air bag support 3; an elastic ring 10 is arranged between any end cover 7 and the outer peripheral surface of the axial end part of the air bag bracket 3.
The shape and size of the first gasket 8 and the second gasket 9 are close to the end surface of the airbag bracket 3, in other words, the end surface of the airbag bracket 3 is annular, and the first gasket 8 and the second gasket 9 are also annular and have a size close to the size of the end surface of the airbag bracket 3. The first seal gasket 8 and the second seal gasket 9 are both attached to two opposite sides of the tubular airbag membrane, for example, referring to fig. 2, the upper end cover, the first seal gasket 8, the tubular airbag membrane, the second seal gasket 9, and the upper end surface of the airbag support 3 are sequentially distributed from top to bottom in the longitudinal direction of fig. 2.
The elastic ring 10 is located on the circumferential side of the axial end of the airbag holder 3, and when the axial end of the tubular airbag membrane is rolled up on the axial end of the airbag holder 3, the elastic ring 10 tightens the axial end of the tubular airbag membrane to the axial end of the airbag holder 3. In particular, the outer circumference of the axial end of the airbag support 3 may be provided with an annular groove which is coaxially arranged with the airbag support 3, and the elastic ring 10 may be inserted into the annular groove, thereby improving the sealing and fixing effects of the elastic ring 10 on the tubular airbag membrane and the airbag support 3.
For the device for testing the adhesion performance of the soft substrate coating, one of the functions of the container 1 is to position and mount the inflatable and deflatable air bag 2 and restrain the deformation direction of the inflatable and deflatable air bag 2 in the inflation and deflation process, ensure that the inflatable and deflatable air bag 2 surrounds the periphery of the tubular substrate 01 to be tested and apply pressure to the tubular substrate 01 to be tested; the second function of the container 1 is to contain a liquid medium, so as to provide a testing environment closer to the specific operating environment of the tubular substrate 01 to be tested for the tubular substrate 01 to be tested.
To the latter effect, when the device for testing the adhesion property of the coating of the soft substrate is used, the liquid medium needs to be immersed in the tube testing section of the tubular substrate 01 to be tested, and a transparent cup can be used as the container 1 in order to judge whether the liquid medium is immersed in the tube testing section.
Specially, the surface of this transparent cup can set up the scale that distributes to the rim of a cup along the bottom of a cup, and this scale not only can assist operating personnel to judge the submergence degree of liquid medium to aforementioned body test interval, can also assist operating personnel to obtain the displacement of the tubulose base member 01 that awaits measuring in the testing process.
As for the inflatable and deflatable bladder 2 of the soft substrate coating adhesion performance test device, it can be connected to the air pump 4 and the air pressure gauge 5; the air pump 4 is used for inflating and maintaining the pressure of the inflatable and deflatable bladder 2, and the barometer 5 is used for measuring the internal pressure of the inflatable and deflatable bladder 2, and the internal pressure is used for analyzing and judging the adhesion performance of the substrate outer coating.
In order to observe the movement of the tubular substrate 01 to be measured relative to the tubular airbag membrane, the airbag support 3 may be a transparent support, and the surface may be provided with scales. In addition, in order to connect the sealed chamber between the airbag housing 3 and the cylindrical airbag membrane by the air pump 4 and the air pressure gauge 5, a threaded hole may be provided through the surface of the airbag housing 3 so that the air pump 4 and the air pressure gauge 5 are sealingly mounted to the airbag housing 3 by the threaded hole. In order to improve the sealing performance of the air pump 4 and the barometer 5 and the airbag support 3, the central axis of the threaded hole is perpendicular to the central axis of the airbag support 3, and the coaxiality of the matching surfaces of the air pump 4 and the barometer 5 and the threaded hole is improved. In addition, an air pump sealing piece 13 can be arranged at the matching position of the air pump 4 and the threaded hole; a barometer seal 15 is provided at the mating of the barometer 5 and the threaded hole.
The tubular air sac film can be a high-molecular transparent film with high elasticity so as to simulate tissue substances such as skin, blood vessels or mucous membranes of a human body. The barometer 5 can specifically adopt a needle type air box barometer 5; the barometer 5 is communicated with a sealing cavity between the air bag support 3 and the cylindrical air bag film through an air inlet nozzle 14, the air inlet nozzle 14 is a normally closed inflation inlet, the center of the air inlet nozzle is of a core needle structure, and after the air inlet nozzle 14 is pressed, a channel for air circulation is formed at the core needle.
When the device for testing the adhesion performance of the soft matrix coating is used, when the inflatable and deflatable air bag 2 is arranged around and extrudes the peripheral side surface of the tubular matrix 01 to be tested, the tubular matrix 01 to be tested and the inflatable and deflatable air bag 2 generate relative motion, and the state is usually realized by pulling the tubular matrix 01 to be tested from one axial end of the tubular matrix 01 to be tested to move. Therefore, the soft substrate coating adhesion performance test device further comprises a tensile tester 02 or is used in combination with a power device for applying a tensile force to the tubular substrate 01 to be tested.
Wherein, the upper chuck of the tensile testing machine 02 can clamp and fix the tubular matrix 01 to be tested, thereby pulling the tubular matrix 01 to be tested to move relative to the air bag bracket 3.
In order to facilitate the operation of the tensile tester 02, the soft substrate coating adhesion performance testing apparatus may employ a container 1 having an open top, a closed bottom and peripheral sides, and the bottom of the container 1 may be provided with a height adjusting device 11 for moving the container 1 up and down. The height adjusting function of the height adjusting device 11 can meet the installation and test requirements of tubular substrates 01 to be tested with different lengths, and ensure that the tube body test interval and the motion range of the tubular substrates 01 to be tested conform to the operating characteristics of a chuck of the tensile testing machine 02.
The height adjusting device 11 includes components such as an adapter flange 111, an adjusting lever 112, an upper lock nut 114 and a lower lock nut 113 that are fitted over the adjusting lever 112; the adapter flange 111 is used for connecting external equipment, for example, a lower clamp of the tensile testing machine 02, the adjusting rod 112 is matched with the upper locking nut 114 and the lower locking nut 113 to connect the container 1 and the adapter flange 111, and the distance between the container 1 and the adapter flange 111 is adjusted.
On the basis of the plurality of examples provided above, the invention also provides a characterization method of the adhesion performance of the substrate outer coating, which is applied to the adhesion performance testing device of the soft substrate coating.
The characterization method of the adhesion performance of the matrix outer coating comprises the following steps:
s1: the inflatable and deflatable air bag 2 with the internal pressure P is clamped on the periphery of the axial middle part of the tubular base body 01 to be measured with a force FeDrawing the tubular matrix 01 to be measured to move at a uniform speed along the axial direction of the tubular matrix 01 to be measured, and obtaining the contact area Pi DL of the inflatable and deflatable air bag 2 and the tubular matrix 01 to be measured0And a relative sliding distance L;
s2: according to force FeEstablishing an adhesion performance characterization parameter K for the internal pressure P and the contact areaf(ii) a Wherein the content of the first and second substances,
s3: analysis of adhesion Performance characterization parameter KfAnd determining the adhesion performance of the matrix outer coating of the tubular matrix 01 to be detected along with the change rule of the relative sliding distance L.
The characterization method of the adhesion performance of the matrix outer coating provided by the invention evaluates the adhesion performance of the matrix outer coating of the tubular matrix 01 to be tested through testing, analysis and judgment.
First, the testing content of the tubular substrate 01 to be tested by using the device for testing the adhesion performance of the soft substrate coating provided by the present invention includes the steps of clamping the tubular substrate 01 to be tested and stretching the tubular substrate 01 to be tested described in the step S1. In this process, a force F is obtainedeInternal pressure P, and the relative sliding distance L between the inflatable/deflatable bladder 2 and the tubular substrate 01 to be measured. Wherein the relative sliding distance L is equal to the displacement L of the chuck of the tensile testing machine 02e. Meanwhile, in order to reasonably and accurately control the contact areas of the inflatable and deflatable balloon 2 and the tubular substrate to be tested 01, the characterization method utilizes the balloon support 3 of the soft substrate coating adhesion performance testing device to restrain the deformation direction and the deformation degree of the inflatable and deflatable balloon 2, so that the inflatable and deflatable balloon 2 can be just extruded on a specific area of the tubular substrate to be tested 01, and the contact areas of the inflatable and deflatable balloon 2 and the tubular substrate to be tested 01 can be represented by the area of the specific area. In short, the characterization method can be used to measure the dimensional parameters of the tubular substrate 01 to be tested, such as the outer diameter D of the tubular substrate 01 to be tested and the length L of the tube testing interval before the inflatable/deflatable balloon 2 is inflated0The contact area pi DL between the inflatable/deflatable air bag 2 and the tubular substrate 01 to be measured is calculated0。
Wherein, the length L of the test section of the tube body0The length of the joint part of the inflatable/deflatable air bag 2 and the tubular substrate 01 to be detected in the axial direction of the tubular substrate 01 to be detected is referred to; outer pipe diameter D and pipe body test interval length L0Intrinsic parameters belonging to the tubular substrate 01 to be measured; the internal pressure P may be a fixed value that is set manually, as a known quantity; the contact range of the inflatable and deflatable air bag 2 and the tubular substrate 01 to be tested can also meet the length L of the test interval of the tube body0The corresponding variable. Force FeIs a variable required by the uniform motion of the tubular matrix 01 to be tested in the test process. Visible, force FeThe parameter is measured for the target in step S1.
For the internal pressure P, in order to more reasonably apply the confining pressure to the tubular substrate 01 to be tested by using the inflatable and deflatable bladder 2, before the tubular substrate 01 to be tested is formally tested, a pressure test may be performed in advance with a standard sample having the same type and specification as the tubular substrate 01 to be tested, so as to obtain a matching relationship between the two parameters of the diameter and the internal pressure of the standard sample, for example, the internal pressure P of the standard sample and the diameter of the standard sample when the inflatable and deflatable bladder 2 and the standard sample are in effective contact with each other are recorded. Wherein, effective contact means that the inflatable and deflatable air bag 2 and the standard sample are just completely contacted without a gap between the two.
In other words, when the tubular base body 01 to be tested is formally tested, an operator inflates the inflatable and deflatable air bag 2, and in the inflation process, the operator can judge whether the inflatable and deflatable air bag 2 and the tubular base body 01 to be tested are just completely contacted according to whether the internal air pressure of the inflatable and deflatable air bag 2 reaches the recorded value in the pressure test.
During testing, the tubular substrate 01 to be tested penetrates the inflatable and deflatable air bag 2 and hangs in the container 1, and the total length L of the interval to be tested of the tubular substrate 01 to be testedzLength L of test interval with tube body0The magnitude relationship between the two is generally suggested to satisfy the following relationship: l isz≥2L0. In addition, after the inflatable and deflatable airbag 2 is inflated, the inflatable and deflatable airbag 2 can be subjected to air leakage detection, and the inflatable and deflatable airbag 2 is ensured to have no air leakage in the whole testing process.
Secondly, establishing an adhesion performance characterization parameter K according to the test data obtained by the testfThe adhesion Performance characterizing parameter KfCan be used for characterizing and evaluating the adhesion performance of the matrix outer coating of the tubular matrix 01 to be tested.
The above adhesion Performance characterizing parameter KfThe definition method and the calculation mode are as follows:
in step S1, to exert a force FeThe bottom of the container 1 can be fixed in a tensile test by pulling the tubular matrix 01 to be tested to move along the axial direction of the tubular matrix 01 to be testedThe lower chuck of the machine 02 clamps the upper end of the pipe body of the tubular base body 01 to be tested on the upper chuck of the tensile testing machine 02, then pulls the upper end of the pipe body of the tubular base body 01 to be tested to move upwards according to a preset displacement rate, and in the process, the force F of the tensile testing machine 02 is recordedeAnd displacement L of chuck of tensile testing machine 02e。
Referring to fig. 2, when the bottom end of the tubular substrate 01 to be tested in fig. 2 is flush with the bottom end of the inflatable/deflatable balloon 2,
Le＝Lz-La (1)
the process of the tensile testing machine 02 for drawing the tubular matrix 01 to be tested to move can be divided into the following two stages:
the first stage is as follows: the stage is a starting stage, relative sliding is about to occur between the tubular matrix 01 to be tested and the inflatable and deflatable air bag 2, and F is collected by the tensile testing machine 02eFor static friction, the second stage is entered after the maximum value is reached.
And a second stage: at this stage, the tubular substrate 01 to be tested and the inflatable and deflatable air bag 2 slide relatively to each other at a predetermined movement rate, and the bottom end of the tubular substrate 01 to be tested is suspended in the container 1, in other words, the relative displacement between the tubular substrate 01 to be tested and the inflatable and deflatable air bag 2 is smaller than LzAnd LaThe difference between them. At this stage, F is collected by the tensile tester 02eIs a sliding friction force.
The second stage is the analysis stage of the key application of the characterization method of the adhesion property of the base outer coating. In this phase, the friction force between the tubular substrate 01 to be measured and the inflatable/deflatable balloon 2 is defined as FfThe relative displacement of the tubular matrix 01 to be measured and the inflatable and deflatable air bag 2 is L in the experiment processfThe rigidity coefficient of the tubular matrix 01 to be measured is K, and the rigidity coefficient of the tubular matrix 01 to be measured is FeUnder the action of the elastic deformation of the axial direction to LxThen the following relationships exist for the aforementioned parameters:
Ff＝Fe (2)
Le＝Lf+Lx (3)
at the same time, the effective contact length of the tubular substrate 01 to be tested and the inflatable/deflatable air bag 2 along the axial direction of the tubular substrate 01 to be tested is defined as LaWhen the internal pressure P of the inflatable/deflatable balloon 2 is adjusted to a specific value, the inflatable/deflatable balloon 2 is simultaneously constrained by the tubular substrate 01 to be tested and the balloon stent 3, and the effective contact length between the tubular substrate 01 to be tested and the inflatable/deflatable balloon 2 is LaApproximately equals to the length L of the tube body test section of the inflatable and deflatable air bag 2 along the tubular matrix 01 to be tested0I.e. La≈L0The length L of the test section of the tube0Can be precisely controlled by the balloon stent 3.
Due to axial deformation L of the tubular substrate 01 to be measuredxIs much smaller than the relative displacement L between the tubular matrix 01 to be measured and the inflatable and deflatable air bag 2fBased on this, L can be usedeTo represent Lf。
Because the tensile testing machine 02 draws the tubular matrix 01 to be tested to move at a uniform speed, F can be adoptedeRepresenting the friction force F between the tubular substrate 01 and the inflatable/deflatable balloon 2f。
In addition, the original pipe diameter of the tubular substrate 01 to be measured specifically means that the outer pipe diameter is D, when the inflatable and deflatable airbag 2 extrudes the tubular substrate 01 to be measured, the tubular substrate 01 to be measured is subjected to confining pressure, and the deformation of the tubular substrate 01 to be measured along the radial direction is uniform and very small, so that the outer pipe diameter of the tubular substrate 01 to be measured after deformation can be regarded as D, and D is approximately equal to D.
Based on the above analysis and setting, the adhesion condition of the coating on the surface of the tubular body of the tubular substrate 01 to be measured is directly reflected by the friction force FfThe difference of the distribution along the axial direction of the tubular substrate 01 to be measured, so that the friction force F between the tubular substrate 01 to be measured and the inflatable/deflatable balloon 2fThe following relationship exists with respect to the internal pressure P of the inflatable and deflatable bladder 2:
Ff＝Fe＝KfπDL0×P (5)
in the formula (5), pi, D, L0Is constant, the internal pressure P is the degree of the barometer, KfThe average sliding friction coefficient per unit area of the tubular substrate 01 to be measured is related to the surface coating of the tubular substrate 01 to be measured, and is unrelated to the internal pressure P, the material and the nominal size of the tubular substrate 01 to be measured, so that the formula (5) is transformed to obtain:
from the above, K of the tubular substrate 01 to be measured can be establishedf-LeGraph and is also Kf-L plot. K established according to equation (6)fThe value is irrelevant to the diameter of the tubular matrix 01 to be tested, the size of the soft matrix coating adhesion performance testing device and the internal pressure P of the inflatable and deflatable air bag 2, and can be directly used for transverse comparison of testing results of different samples or the same sample after different cycle times.
Finally, a characterization parameter K based on the adhesion properties mentioned abovefAnd analyzing and judging the adhesion performance of the matrix outer coating of the tubular matrix 01 to be detected.
Taking the tubular substrate 01 to be tested as a medical apparatus tube such as a catheter, a venous catheter and the like as an example, the adhesion performance in the step S3 may include the adhesion, adhesion uniformity and coating smoothness of the medical apparatus tube. Of course, adhesion refers to the adhesion of the outer coating of the substrate to the surface of the medical device tubing; the adhesion uniformity refers to the adhesion uniformity of the matrix outer coating on the surface of the medical instrument pipe; coating smoothness refers to the smoothness of the outer coating of the substrate on the surface of the medical device tube.
Wherein, for the same tubular matrix 01 to be measured, within the measuring range, if KfIf the value is constant, the coating on the surface of the tubular matrix 01 to be detected is uniformly adhered, and the adhesive force consistency of the coating is good; kfA smaller value indicates a smoother coating.
For the same tubular substrate 01 to be tested, after N tests, if KfAn overall increase in value indicates a waitMeasuring the peeling-off sign of the coating on the surface of the tubular substrate 01; if KfWhen the change is suddenly changed at a certain position, the coating on the surface of the tubular substrate 01 to be tested, which is currently in contact with the inflatable and deflatable air bag 2, is unevenly adhered, or the coating and the tubular substrate 01 to be tested are stripped due to the poor adhesion of the coating.
For different tubular substrates 01 to be measured, the K can be directly usedfThe values were compared for coating adhesion. Wherein, KfThe larger values have poor coating smoothness or coating adhesion.
Referring to fig. 3, fig. 3 is constructed based on actual test data of three different tubular substrates 01 to be tested, i.e., a sample a, a sample B, and a sample C.
As can be seen from fig. 3, the first test results show that in the first stage, the starting friction of sample a > the starting friction of sample B > the starting friction of sample C. K of sample A, sample B and sample C in the second stagefThe values are constant values, which shows that the surface coatings of the respective measuring areas of the sample A, the sample B and the sample C are uniformly adhered; due to KfA＞KfB＞KfCThis indicates that the substrate overcoat of sample A is less smooth, the substrate overcoat of sample B is less smooth, and the substrate overcoat of sample C is the best smooth.
After repeating the experiment N times, comparing the test results of the sample a, the sample B and the sample C N +1 times again and analyzing the second stage emphatically, the following conclusions can be obtained:
k obtained in the N +1 th test of sample AfThe value of K is compared with that of sample A obtained in the 1 st testfThe values are consistent, which shows that after N times of tests, the coating adhesion of the sample A maintains the initial performance and the adhesion condition is good.
K obtained in the N +1 th test of sample BfThe value is compared with the K obtained in the 1 st test for sample BfThe overall value increases, indicating a change in the base overcoat of sample B, which has poorer adhesion than the base overcoat of sample a.
K of sample C when the abscissa value in FIG. 3 is MfThe value suddenly increased, indicating that the coating of the area to be measured of sample C suddenly became uneven as sample C slides relative to the inflatable bladder 2. It can be seen that by analysis KfThe position of the fluctuation of the values along the abscissa allows the analysis and determination of the specific position of the imperfect coating on the surface of the specimen C.
In the above analysis process, the transverse comparison of FIG. 3 is performed, and K of the sample A is shownfConstant value, K of sample BfValue and K of sample CfThe values all fluctuate, indicating that the coating adhesion of sample A is superior to the coating adhesion of samples B and C.
For optimizing the operation, on the basis of the above embodiment, step S1 may include:
s11: inflating the inflatable and deflatable air bag 2 until the inflatable and deflatable air bag 2 is close to the outer peripheral surface of the tubular base body 01 to be detected;
s12: adding a liquid medium into the container 1 until the liquid level is lower than and close to the top surface of the inflatable and deflatable air bag 2;
s13: the inflatable and deflatable air bag 2 is inflated until the internal pressure of the inflatable and deflatable air bag 2 is P, so that the inflatable and deflatable air bag 2 is attached to the outer peripheral surface of the tubular base body 01 to be measured.
When the three steps are sequentially operated, the liquid level of the liquid medium in the container 1 can be ensured to be equal to or slightly higher than the top surface of the inflatable and deflatable air bag 2, the liquid medium can be prevented from splashing due to the quick inflation of the inflatable and deflatable air bag 2, or the liquid medium can not be uniformly filled between the inflatable and deflatable air bag 2 and the tubular substrate 01 to be detected.
In summary, the device for testing the adhesion performance of the soft substrate coating provided by the invention can apply pressure to the tubular substrate 01 to be tested in an annular manner, so that a uniform annular positive pressure distribution effect is formed on the circumferential surface of the tubular substrate 01 to be tested, the surface coating of the tubular substrate 01 to be tested is not damaged, the defects of non-uniformity and large deformation of a soft substrate sample caused by a flat experiment can be effectively avoided, and the clinical use condition of the tubular substrate 01 to be tested is simulated more truly. Based on the device for testing the adhesion performance of the soft matrix coating, the invention also provides a device suitable for testing the adhesion performance of the soft coating on the tubular soft matrix sampleThe characterization method of the force has the advantages that the characterization result is not influenced by the internal pressure P and the specification of the tubular matrix 01 to be tested, and the method can be used for characterizing whether the surface coating of the tubular matrix 01 to be tested is uniformly attached or peeled; the method can also be used for representing the coating smoothness of the surface coatings under different coating processes, and can effectively avoid the defect that the results cannot be compared transversely due to different substrate sizes and different positive pressures in the flat plate experiments. Measurement result K of the present characterization methodfFollowing displacement Le(Le＝Lz-La) The method can be used for quantitative measurement and determination of the adhesion condition of the coating of the tubular matrix 01 to be tested at a certain determined position in a test area, and has the advantages of comprehensive test result and good position directivity.
The device for testing the adhesion performance of the soft substrate coating and the characterization method provided by the invention are described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Claims (10)
1. The device for testing the adhesion performance of the soft substrate coating is characterized by comprising a container (1), an air bag bracket (3) fixed in the container (1) and an inflatable and deflatable air bag (2) arranged in the air bag bracket (3); the periphery of the air bag support (3) is closed, and mounting holes (6) for the tubular base body (01) to be tested to penetrate through are formed in the top and the bottom of the air bag support respectively; any one mounting hole (6) is used for being separated from the tubular substrate (01) to be tested so as to realize the shuttling of the tubular substrate (01) to be tested relative to the air bag support (3); the inflatable and deflatable air bag (2) is expanded and deformed inwards from the peripheral side of the air bag bracket (3) to surround and extrude the peripheral side surface of the tubular base body (01) to be detected; the container is internally provided with a liquid medium which can be filled between the inflatable and deflatable air bag (2) and the tubular matrix (01) to be measured.
2. The soft substrate coating adhesion performance test device of claim 1, wherein the balloon stent (3) has a circular tube shape; the inflatable and deflatable air bag (2) comprises a cylindrical air bag membrane; the axial middle part of the cylindrical air bag film is sleeved on the air bag bracket (3); and the two axial ends of the cylindrical air bag film are turned and fixed outside the two axial ends of the air bag bracket (3) in a sealing manner.
3. The soft substrate coating adhesion performance testing device according to claim 2, wherein two axial ends of the air bag support (3) are respectively sleeved with an end cover (7); a first sealing gasket (8) and a second sealing gasket (9) which are tightly attached to two sides of the cylindrical air bag film are arranged between the axial end faces of any end cover (7) and the air bag bracket (3); an elastic ring (10) tightly tightened on the periphery of the cylindrical air bag film is arranged between the end cover (7) and the outer peripheral surface of the axial end part of the air bag bracket (3); the periphery of the air bag support (3) is provided with an annular groove for the elastic ring (10) to be embedded and positioned.
4. The soft substrate coating adhesion property test device according to claim 1, wherein the container (1) is a transparent cup body with a scale on the surface.
5. The soft substrate coating adhesion testing device of claim 1, wherein the inflatable and deflatable balloon (2) is connected with an air pump (4) and an air pressure gauge (5).
6. The device for testing the adhesion of a soft base coating according to any one of claims 1 to 5, further comprising a tensile tester; the tensile testing machine is provided with an upper clamping head used for clamping and pulling the tubular matrix (01) to be tested to shuttle relative to the air sac bracket (3).
7. The soft substrate coating adhesion performance test device of claim 6, wherein the top of the container (1) is open; the bottom of the container (1) is provided with a height adjusting device (11).
8. A method for characterizing the adhesion performance of a soft substrate coating, which is applied to the soft substrate coating adhesion performance testing device of any one of claims 1 to 7, comprising:
s1: the inflatable and deflatable air bag (2) with the internal pressure P is clamped on the peripheral side of the axial middle part of the tubular base body (01) to be measured by force FeDrawing the tubular matrix (01) to be detected to move at a uniform speed along the axial direction of the tubular matrix (01) to be detected, and obtaining the contact area pi DL of the inflatable and deflatable air bag (2) and the tubular matrix (01) to be detected0And a relative sliding distance L;
s2: according to said force FeEstablishing an adhesion performance characterization parameter K for the internal pressure P and the contact areaf(ii) a Wherein the content of the first and second substances,
s3: analyzing said adhesion Performance characterizing parameter KfAnd determining the adhesion performance of the matrix outer coating of the tubular matrix (01) to be detected along with the change rule of the relative sliding distance L.
9. The method for characterizing the adhesion of a soft substrate coating as claimed in claim 8, wherein said S1 includes:
s11: inflating an inflatable and deflatable air bag (2) until the inflatable and deflatable air bag (2) is close to the outer peripheral surface of the tubular base body (01) to be tested;
s12: adding a liquid medium into the container (1) until the liquid level is lower than and close to the top surface of the inflatable and deflatable air bag (2);
s13: and inflating the inflatable and deflatable air bag (2) until the internal pressure of the inflatable and deflatable air bag (2) is P so as to enable the inflatable and deflatable air bag (2) to be attached to the outer peripheral surface of the tubular base body (01) to be measured.
10. The method for characterizing the adhesion of a soft substrate coating as claimed in claim 8, wherein the adhesion properties in S3 include adhesion, adhesion uniformity, and coating smoothness.
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| CN115436169A (en) * | 2022-08-23 | 2022-12-06 | 大连理工大学 | Method for determining metal anisotropy constitutive model based on tubular sample with small hole |
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