JP5457237B2 - Liquid adhesion measuring device, liquid adhesion measuring method - Google Patents

Description

  The present invention relates to a liquid adhesion apparatus that measures the adhesion force of a liquid to an evaluation surface of an object, and a liquid adhesion measurement method that measures the adhesion force.

  One of the evaluation items for the surface characteristics of various materials is the adhesion of liquid. As a method for evaluating the adhesive force, it is general to indirectly evaluate the liquid by dropping a liquid on the surface of the object to be evaluated and measuring the contact angle.

  On the other hand, as in Patent Document 1, when a spherical carrier carrying a liquid is brought close to the evaluation surface of an object, a liquid bridge is formed between the evaluation surface and the spherical carrier, and both are separated. There has also been proposed a method for directly measuring the adhesive force by measuring the external force required for the above. In this measurement method, the stress generated in the cross-linking of the liquid is measured in a pseudo manner using the carrier and is used as an adhesive force.

JP 2004-144573 A

  However, in the evaluation method of Patent Document 1, it is assumed that the external force acting on the carrier when dividing the liquid bridge approximates the stress generated in the liquid bridge, and thus the liquid bridge is not formed correctly. However, there is a problem that a measurement error may occur. For example, when unevenness exists on the surface of the evaluation object, liquid cross-linking is not stably formed, and measurement errors are likely to occur.

  Therefore, in paragraph “0016” of this Patent Document 1, although the cubic shape, the conical shape, the pyramid shape and the like are listed as the types of the supporting body, the liquid is supported and the liquid bridging shape does not vary. Therefore, it is stated that a cubic shape, a cone shape, a pyramid shape and the like are not preferable in practice. Therefore, no proposal for a specific measurement method has been made for the carrier having these shapes.

  As a result, by using a sphere as a carrier, a small liquid bridge is formed between the lower end of the sphere and the object, and the liquid bridge is preferentially broken to measure stress, so that it is susceptible to disturbance, There was a problem that an error was likely to occur in the measurement result itself.

  Further, in the conventional evaluation method, since the wettability relationship between the carrier and the evaluation object is unclear, the influence of the tensile force between the liquid and the carrier also affects the measurement result. There was concern.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a highly reliable liquid adhesion measuring device and a measuring method that hardly cause measurement errors.

The present invention that achieves the above object is a liquid adhesion measuring device that measures the adhesion of a liquid to a planar evaluation surface of an object, the base on which the object is placed, and the object of the object A measuring jig having a planar lyophilic surface that is substantially parallel to the evaluation surface and has higher wettability than the evaluation surface, and the liquid is held between the evaluation surface and the lyophilic surface. A moving mechanism for relatively moving the table and the measuring jig; and a force measuring mechanism for measuring a resistance force acting between the evaluation surface and the lyophilic surface during the relative movement by the moving mechanism , By holding the liquid between the evaluation surface and the lyophilic surface in a state where at least one of the evaluation surface and the lyophilic surface is wetted with the liquid, the evaluation surface or the lyophilic surface And the adhesion force per unit area based on the resistance force A liquid adhering force measuring apparatus characterized by a constant possible.

  The liquid adhesion measuring apparatus that achieves the above object is characterized in that, in the above means, the evaluation surface and the lyophilic surface are flat surfaces.

  In the liquid adhesion measuring apparatus that achieves the above object, in the above means, the area of the lyophilic surface is set smaller than the evaluation surface, and the liquid is held between the evaluation surface and the lyophilic surface. In this case, the entire area of the lyophilic surface is wetted with the liquid.

  The liquid adhesion measuring apparatus that achieves the above object is characterized in that, in the above means, the lyophilic surface is made of a material mainly containing platinum.

  The moving mechanism of the liquid adhesion measuring apparatus that achieves the above object is characterized in that, in the above means, the evaluation surface and the lyophilic surface are separated in a direction perpendicular to the surface.

  The liquid adhesion measuring apparatus that achieves the above object is characterized in that, in the above means, the evaluation surface and the lyophilic surface are arranged so that the surface directions thereof are horizontal.

  The moving mechanism of the liquid adhesion measuring apparatus that achieves the above object is characterized in that, in the above means, the evaluation surface and the lyophilic surface are relatively moved in the surface direction.

  The liquid adhesion measuring apparatus that achieves the above object is characterized in that, in the above means, the surface directions of the evaluation surface and the lyophilic surface are non-horizontal.

  The liquid adhesion measuring apparatus that achieves the above object is characterized in that, in the above means, the evaluation surface and the lyophilic surface are arranged substantially perpendicular to each other.

The present invention that achieves the above object is a liquid adhesion measuring method for measuring the adhesion of a liquid to a planar evaluation surface of an object, wherein the measurement treatment has a lyophilic surface having higher wettability than the evaluation surface. An instrument is disposed substantially parallel to the evaluation surface of the object, and at least one of the evaluation surface and the lyophilic surface is wetted with the liquid, the evaluation surface and the lyophilic liquid to retain the liquid between the surfaces, the lyophilic surface and the evaluation surface by relatively moving the resistance force acting between the lyophilic surface and the evaluation surface was measured, the evaluation surface or the parent The liquid adhesion measuring method is characterized in that the adhesion per unit area is measured based on the area of the liquid surface and the resistance .

  In the liquid adhesion measuring method that achieves the above object, in the above means, the area of the lyophilic surface is set smaller than the evaluation surface, and the liquid is held between the evaluation surface and the lyophilic surface. In this case, the entire area of the lyophilic surface is wetted with the liquid.

  The liquid adhesion measuring method that achieves the above-described object is the above-mentioned means, wherein the evaluation surface and the lyophilic surface are arranged so as to be horizontal, and the evaluation surface and the lyophilic surface are separated in a direction perpendicular to the surface, The resistance force is measured.

  The liquid adhesion measuring method that achieves the above-described object is characterized in that, in the above-mentioned means, the evaluation surface and the lyophilic surface are arranged so that the surface directions are substantially perpendicular, and the evaluation surface and the lyophilic surface are relative to each other in the surface direction. The resistance force is measured while being moved.

  According to the present invention, it is possible to achieve an excellent effect that the adhesion force of the liquid to the evaluation surface can be measured quantitatively and with high accuracy.

It is a perspective view showing the whole liquid adhesive force measuring device composition concerning a 1st embodiment of the present invention. It is a front view which expands and shows the measurement jig | tool of the liquid adhesion force measuring apparatus. It is an enlarged front view which shows the measuring method using the liquid adhesion force measuring apparatus. It is a front view which expands and shows the other structural example of the liquid adhesion force measuring apparatus. It is a perspective view which shows the whole structure of the liquid adhesive force measuring apparatus which concerns on 2nd Embodiment of this invention. It is an enlarged front view which shows the measuring method using the liquid adhesion force measuring apparatus. It is a front view which expands and shows the other structural example of the liquid adhesion force measuring apparatus. It is a front view which expands and shows the other structural example of the liquid adhesion force measuring apparatus.

  Hereinafter, a liquid adhesion measuring apparatus according to an embodiment of the present invention will be described in detail with reference to the drawings.

  FIG. 1 shows an overall configuration of a liquid adhesion measuring device 1 (hereinafter referred to as a measuring device 1) according to the first embodiment. The measuring apparatus 1 includes a housing 10, a base (stage) 20, a slider 30, an electronic balance 40, and a measuring jig 50. The casing 10 is a member that becomes an outer frame and a main frame of the measuring apparatus 1 and ensures the strength and rigidity of the entire apparatus necessary for measurement. The base 20 is composed of a circular table. A plate-like object 80 is fixed on the upper surface of the circular table. The upper surface of the object 80 is an evaluation surface 80A for measuring the adhesion force to the liquid.

  The slider 30 is a member that is fixed to the housing 10 and moves the base 20 up and down in the vertical direction. Since the slider 30 is accommodated in the housing 10, the base 20 is guided by a linear guide (not shown) in the vertical direction. Further, since this guidance is accommodated in the housing 10, it is performed by a ball screw and a drive motor (not shown).

  The electronic balance 40 is fixed above the housing 10 and hangs the hook 42 above the base 20. The electronic balance 40 detects the lower urging force acting on the hook 42 and outputs it as electronic information to the outside.

  FIG. 2 shows an enlarged view of the measuring jig 50 hooked on the hook 42. The measuring jig 50 includes a rectangular platinum plate 52 arranged in the horizontal direction, and a hooked portion 54 that protrudes in the direction perpendicular to the upper surface of the platinum plate 52. The measuring jig 50 is held in the air by hooking the hooked portion 54 on the hook 42 of the electronic balance 40. The lower surface of the platinum plate 52 is a planar lyophilic surface 52A having higher wettability than the evaluation surface 80A of the object 80.

  The measuring jig 50 has a center of gravity so that the lyophilic surface 52A is horizontal when hooked on the hook 42. Therefore, if the object 80 is set on the base 20 so that the evaluation surface 80A is horizontal, the evaluation surface 80A and the lyophilic surface 52A face each other in a parallel state.

  The platinum plate 52 has a longitudinal direction of 2 cm, a width direction of 1 cm, and a thickness of 0.5 mm. Therefore, the size of the lyophilic surface 52A also matches this. That is, the size of the lyophilic surface 52A is 2 cm in the longitudinal direction and 1 cm in the width direction. On the other hand, the size of the evaluation surface 80A is set larger than the size of the lyophilic surface 52A.

  Next, with reference to FIG. 3, a method for measuring the liquid adhesion force using the measuring device 1 will be described.

  First, the plate-like object 80 is set in a state where the base 20 is moved downward. Next, in a state where the evaluation surface 80A is horizontal, a liquid to be evaluated is dropped onto the evaluation surface 80A. For example, when measuring the adhesion of water, water is dropped, and when measuring the adhesion of oil, oil is dropped. When the liquid is dropped, a droplet 90 is formed on the evaluation surface 80A as shown in FIG.

  Thereafter, the base 20 is raised by the slider 30, and the droplet 90 is brought into contact with the lyophilic surface 52 </ b> A of the measuring jig 50 hooked on the hook 42. Since the lyophilic surface 52A is also held horizontally, when the base 20 is further raised, the droplet 90 is crushed by the evaluation surface 80A and the lyophilic surface 52A. Since the area of the lyophilic surface 52A is set to be small, the droplet 90 leaks to the outer periphery of the lyophilic surface 52A as shown in FIG. In this state, the rising of the base 20 is stopped. As a result, the entire area of the lyophilic surface 52A is wetted with the liquid, and a gap P is secured between the lyophilic surface 52A and the evaluation surface 80A. In addition, it is preferable to control this gap P in a range that is larger than 0 mm and 1 mm or less. Preferably, it is stopped at 0.5 mm or less.

  Subsequently, when the evaluation surface 80A and the lyophilic surface 52A are moved away from each other in the direction perpendicular to the surface by moving the base 20 downward, as shown in FIG. The tool 50 is pulled downward. As described above, since the lyophilic surface 52A has a higher wettability with respect to the liquid to be evaluated (the contact angle is smaller) than the evaluation surface 80A, the boundary between the lyophilic surface 52A and the liquid is mutually strong. Are connected. On the other hand, the boundary between the evaluation surface 80A and the liquid is weakly coupled to each other. Therefore, as the gap P increases, the connection state between the evaluation surface 80A and the liquid boundary tends to peel off preferentially. When the resistance force by which the measuring jig 50 is pulled downward is measured by the electronic balance 40, only the binding force between the liquid and the evaluation surface 80A side is measured. Moreover, since the lyophilic surface 52A and the liquid are wet and adhere to the entire surface, the region (area) where the bonding force (resistance force) between the liquid and the evaluation surface 80A is generated is the entire lyophilic surface 52. Almost matches. Therefore, if the resistance force measured by the electronic balance 40 is divided by the area of the lyophilic surface 52, it is possible to measure the bonding force per unit area on the evaluation surface 80A side, that is, the quantitative adhesion force.

  As described above, according to the measurement apparatus 1 of the first embodiment, the liquid spreading on the evaluation surface 80A can be obtained by making the planar lyophilic surface 52A having high wettability and the evaluation surface 80A having low wettability face each other in parallel. By pulling in the surface state, it becomes possible to measure the bonding force (resistance force when leaving) of the evaluation surface 80A and the liquid. As a result, for example, if the bonding force is evaluated based on the area of the lyophilic surface 52A, the adhesive force per unit area can be calculated, and an evaluation index with high objectivity can be obtained. That is, in the conventional method of measuring using the cross-linking of droplets, it is difficult to evaluate the adhesion force from the viewpoint of unit area because the bonding force depends on the cross-linking state of the droplets. In one embodiment, there is an advantage that the tensile area can be quantified over the entire lyophilic surface 52A by increasing the wettability of the lyophilic surface 52A. Here, the adhesive force per unit area is calculated by the area of the lyophilic surface 52A by reducing the area of the lyophilic surface 52A compared to the evaluation surface 80A, but of course, conversely, By reducing the area on the evaluation surface 80A side, the entire area of the evaluation surface 80A may be wetted, and the adhesive force per unit area may be calculated based on the area of the evaluation surface 80A.

  In particular, according to the present measuring apparatus 1, the lyophilic surface 52A is made of a material mainly containing platinum, and the wettability is very strong. Therefore, it is possible to measure the object 80 of most materials. . Of course, other materials can be used as long as they have higher wettability than the evaluation surface 80A.

  In the first embodiment, the case where the lyophilic surface 52A and the evaluation surface 80A are flat has been shown. However, for example, as shown in FIG. 4A, the evaluation surface 80A is a curved surface, In the case of a bent surface as shown in FIG. 4B, it is preferable that the lyophilic surface 52A is curved and bent in accordance with the shape so as to be parallel to the evaluation surface 80A.

  Further, in the first embodiment, a case has been described in which droplets are dropped on the evaluation surface 80A side and wetted in advance, and the lyophilic surface 52A is brought close to the evaluation surface 80A. It is also preferable that the evaluation surface 80A is brought close to the lyophilic surface 52A.

  Next, a liquid adhesion measuring apparatus 101 (hereinafter referred to as a measuring apparatus 101) according to a second embodiment will be described with reference to FIG. This measuring apparatus 101 measures the adhesion force (sliding property) between the evaluation surface and the liquid in the surface direction. Except for the method of fixing the object to the base and the shape of the measurement jig, the configuration is the same as that of the measurement apparatus 1 of the first embodiment, and therefore, the difference will be mainly described here. Moreover, the description of 1st Embodiment is used for description of each member by making the last two digits of the code | symbol in the figure and description of the measurement apparatus 101 correspond with the measurement apparatus 1 of 1st Embodiment.

  The measuring apparatus 101 places the object 180 on the upper surface of the base 20 so that the surface direction of the evaluation surface 180A is the vertical direction. The measuring jig 150 includes a rectangular platinum plate 152 arranged in the vertical direction, and a hooked portion 154 that protrudes upward in the surface direction at the upper edge of the platinum plate 152. The measuring jig 150 is held by hooking the hooked portion 154 on the hook 142 of the electronic balance 140. One surface of the platinum plate 152 is a planar lyophilic surface 152A having higher wettability than the evaluation surface 180A of the object 180. In particular, the center of gravity of the measuring jig 150 is set so that the surface direction of the lyophilic surface 152A is vertical when hooked on the hook 142. Therefore, the evaluation surface 180A and the lyophilic surface 152A are both perpendicular to each other and can be opposed to each other in a parallel state. The size of the lyophilic surface 152A of the measuring jig 150 is set smaller than the size of the evaluation surface 180A.

  Next, a method for measuring the adhesive force in the surface direction using the measuring apparatus 101 will be described with reference to FIG.

  In this measuring apparatus 101, first, the object 180 is set on the base 120, and the base 120 is raised in advance. On the other hand, after the measurement jig 150 is immersed in the liquid to be evaluated and the lyophilic surface 152A is wetted with the liquid, the measurement jig 150 is hooked on the hook 142, and as shown in FIG. Liquid 190 is sandwiched between lyophilic surface 152A and evaluation surface 180A. As a result, the entire lyophilic surface 152A becomes wet with the liquid 190.

  Next, when the evaluation surface 180A and the lyophilic surface 152A are relatively moved in the surface direction by moving the base 120 downward, as shown in FIG. Force), the measuring jig 150 is pulled downward. As already described, the lyophilic surface 152A has higher wettability with respect to the liquid 190 (the contact angle is smaller) than the evaluation surface 180A. Therefore, the boundary between the lyophilic surface 152A and the liquid 190 is strongly coupled to each other, and the boundary between the evaluation surface 180A and the liquid 190 is weakly coupled to each other. Therefore, during the relative movement in the surface direction of both, the connection in the surface direction at the boundary between the evaluation surface 180A and the liquid 190 is preferentially shifted. If the force with which the measuring jig 150 is pulled downward by the electronic balance 140, that is, the resistance force due to the deviation is measured, only the bonding force in the surface direction on the liquid 190 and the evaluation surface 180A side is measured. In addition, since the lyophilic surface 152A and the liquid 190 are wet and adhere to the entire surface, the region (area) where the bonding force (resistance force) between the liquid 190 and the evaluation surface 180A is generated is the lyophilic surface. It almost coincides with the total area of 152. Therefore, when the resistance measured by the electronic balance 140 is divided by the area of the lyophilic surface 152, the bonding force in the surface direction per unit area on the evaluation surface 180A side, that is, the quantitative adhesion force in the surface direction is measured. It becomes possible.

  According to the measuring apparatus 101 of the second embodiment, it is possible to calculate the adhesion force in the surface direction between the liquid and the evaluation surface 180A. For example, it is possible to quantitatively evaluate how much the liquid easily slides and moves in the plane direction with respect to the glass surface. In particular, since the evaluation surface 180A and the lyophilic surface 152A are held in the vertical direction, gravity in the surface vertical direction does not act on the liquid, so that only the adhesion force of the liquid in the surface direction can be accurately extracted. On the other hand, as shown in FIG. 7A, depending on the purpose, the evaluation surface 180A and the lyophilic surface 152A are made horizontal or inclined as shown in FIG. On the other hand, while applying a clamping force including the weight of the measuring jig 150, the two may be relatively moved in the surface direction. In the second embodiment, the case of relative movement in the vertical direction has been described. However, as shown in FIG. 8, relative movement in the horizontal direction is also possible.

  As described above, in the first and second embodiments, the electronic balance is used to detect the adhesion force of the liquid, but the force measurement mechanism in the present invention is not limited to this, and only the spring and other various means are used. I can do it. Moreover, although the slider which becomes a moving mechanism showed the type driven with a ball screw, this invention is not limited to this, Other means, such as a rack and pinion and a linear motor, can also be used. Moreover, in this embodiment, although illustrated only when the moving mechanism moves the base 20 side, this invention is not limited to this, You may move the measurement jig | tool side.

  The liquid adhesion measuring device of the present invention is not limited to the above-described embodiment, and various changes can be made without departing from the scope of the present invention.

  The present invention makes it possible to easily and accurately measure the adhesion of various liquids to various objects.

DESCRIPTION OF SYMBOLS 1,101 Liquid adhesion measuring apparatus 10,110 Case 20,120 Base 30,130 Slider 40,140 Electronic balance 50,150 Measuring jig 52A, 152A Lipophilic surface 80,180 Object 80A, 180A Evaluation surface

Claims (13)

A liquid adhesion measuring device for measuring the adhesion of a liquid to a planar evaluation surface of an object,
A base on which the object is placed;
A measuring jig having a planar lyophilic surface substantially parallel to the evaluation surface of the object and having a higher wettability than the evaluation surface;
A moving mechanism for relatively moving the base and the measurement jig in a state where the liquid is held between the evaluation surface and the lyophilic surface;
A force measuring mechanism that measures a resistance force acting between the evaluation surface and the lyophilic surface during relative movement by the moving mechanism;
Equipped with a,
By holding the liquid between the evaluation surface and the lyophilic surface in a state where at least one of the evaluation surface and the lyophilic surface is wetted with the liquid, the evaluation surface or the lyophilic liquid An apparatus for measuring a liquid adhesion force , wherein the adhesion force per unit area can be measured based on the area of the surface and the resistance force .   The liquid adhesion measuring apparatus according to claim 1, wherein the evaluation surface and the lyophilic surface are flat surfaces.   The area of the lyophilic surface is set smaller than the evaluation surface, and when the liquid is held between the evaluation surface and the lyophilic surface, the entire area of the lyophilic surface is wetted with the liquid. The liquid adhesion measuring apparatus according to claim 1, wherein the apparatus is a liquid adhesion measuring apparatus.   4. The liquid adhesion measuring apparatus according to claim 1, wherein the lyophilic surface is made of a material mainly containing platinum.   The liquid adhesion measuring apparatus according to claim 1, wherein the moving mechanism separates the evaluation surface and the lyophilic surface in a direction perpendicular to the surface.   The liquid adhesion measuring device according to claim 5, wherein the evaluation surface and the lyophilic surface are arranged so that the surface directions thereof are horizontal.   The liquid adhesion measuring apparatus according to claim 1, wherein the moving mechanism relatively moves the evaluation surface and the lyophilic surface in a surface direction.   The liquid adhesion measuring apparatus according to claim 7, wherein a surface direction of the evaluation surface and the lyophilic surface is non-horizontal.   The liquid adhesion measuring apparatus according to claim 8, wherein a surface direction of the evaluation surface and the lyophilic surface is arranged substantially perpendicularly. A liquid adhesion measuring method for measuring the adhesion of a liquid to a planar evaluation surface in an object,
A measuring jig having a lyophilic surface having a higher wettability than the evaluation surface is disposed substantially parallel to the evaluation surface of the object,
Holding the liquid between the evaluation surface and the lyophilic surface in a state where at least one of the evaluation surface and the lyophilic surface is wetted with the liquid,
By measuring the resistance acting between the evaluation surface and the lyophilic surface by relatively moving the evaluation surface and the lyophilic surface ,
A method for measuring a liquid adhesive force , comprising measuring an adhesive force per unit area based on an area of the evaluation surface or the lyophilic surface and the resistance force .   When the area of the lyophilic surface is set smaller than the evaluation surface and the liquid is held between the evaluation surface and the lyophilic surface, the entire area of the lyophilic surface is wetted with the liquid. The liquid adhesion measuring method according to claim 10.   The arrangement is such that the evaluation surface and the lyophilic surface are horizontal, and the resistance force is measured while separating the evaluation surface and the lyophilic surface in a direction perpendicular to the surface. The method for measuring the adhesive force of liquid as described in 1.   It arrange | positions so that the surface direction of the said evaluation surface and the said lyophilic surface may become substantially perpendicular | vertical, The said resistance force is measured, moving the said evaluation surface and the said lyophilic surface relatively in a surface direction. Item 12. A method for measuring a liquid adhesion force according to Item 10 or 11.

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