CN217385167U - Pulling-open method adhesive force testing device - Google Patents

Abstract

The utility model provides a pull open method adhesive force testing arrangement, include: the tensile testing machine is provided with a base; a clamp; and the test post, the one end of test post is fixed in the base through anchor clamps, and the other end of test post is equipped with the face that bonds that is used for glued test sample, should bond the face for leveling surface, its characterized in that: the bond surface of the test column was polygonal in shape.

Description

Pulling-open method adhesive force testing device

Technical Field

The utility model relates to a pull open method adhesive force testing arrangement for test coating, colored paint and varnish are at the adhesive force on the substrate.

Background

In the field of paint, the adhesion of a coating/paint film formed by the paint to a substrate is a very important paint property, and when evaluating the adhesion, technicians usually adopt a lattice method and a pull-open method in research and development and production tests. The one-hundred-grid method is widely used because of its simple operation, but it gives only qualitative ratings and does not give quantitative evaluations, and furthermore, it is impossible to make more detailed evaluations by differentiating into six levels (0-5 levels) only in a qualitative manner.

The pull-open type adhesion test method is detailed in GB/T5210-2006 (paint and varnish pull-open method adhesion test), and can quantitatively evaluate the magnitude of adhesion, after a coating to be tested is dried/cured on the surface of a substrate to form a coating, an adhesive is applied to the surface of the coating, a test column is adhered to the surface of the coating to be tested after the adhesive is cured, a sharp knife is used for cutting through the cured adhesive and the coating to the substrate along the periphery of the test column, then the test column is fixed on a tensile testing machine, and then force is applied for drawing, so that the tensile force required for damaging the adhesion between the coating and the substrate is measured.

In the pull-off adhesion test, the test column and the test sample may adopt various relative positional relationships, for example, as shown in fig. 1 to 3. In fig. 1, two test columns 1 sandwich a substrate 2 with a paint film via an adhesive layer; in fig. 2, a test column 2 is bonded to a substrate 4 with a coating 3 via an adhesive layer; in fig. 3, a test column 4 is bonded to a substrate 1 with a coating 2 by means of an adhesive 3.

However, the test column used in the prior art is cylindrical (see fig. 4A and 4B), and therefore, in actual practice, the operation of cutting the paint film along the outer periphery of the test column with a knife is performed manually, and first, the operation of drawing a circle with a knife is difficult, and the experimenter is more inclined to measure with the one-hundred-grid method than the operation of drawing a straight line with a knife. In addition, the operability of the scribing cutting is poor, the cutting along the periphery of the test column is difficult to be tightly attached to the periphery of the test column, the cut is not the circle of the test column, and the figures 4C to 4E of the application show the cutting marks of the paint film cut by a cutter.

In addition, since the coating cut in this way is not regularly circular, the coating may have "weak" portions, and thus, when the coating is pulled off in the pull-off test, the coating is not only broken and attached, but also the effect of stress concentration on the "weak" portions is considered, and the test result is affected thereby. In addition, the cut marks cut by a manual knife are irregular in shape and cannot be unified every time, so that the stressed areas are inconsistent in each test, the result stability is poor, and comparability is avoided. In addition, the cutting depth is not consistent, so that the stress is not uniform, even the situation that the paint film does not completely cut to reach the substrate can occur in serious cases, the situation that the middle layer is stressed and the whole paint film layer is not stressed can occur in the test, and the tested numerical value cannot represent the real coating adhesive force.

The adhesion force is measured by adopting a pulling method at present, which is labor-consuming and time-consuming, limits the inspection speed and prolongs the inspection period. Therefore, improvement is urgently required.

SUMMERY OF THE UTILITY MODEL

In order to solve the above problems of the prior art, the utility model provides a pull open method adhesive force testing arrangement, include: the tensile testing machine is provided with a base and a clamp; and the test column, the one end of test column is passed through anchor clamps are fixed in the base, the other end of test column is equipped with the bonding face that is used for cemented test sample, the bonding face is for leveling surface, its characterized in that: the bonding surface of the test column is polygonal in shape.

Through improving the test column, in the operation of cutting the paint film, an operator can easily perform straight line marking operation by a knife manually, so that the cutting operation is facilitated, and the test of testing the adhesive force of the paint film by a pull-open method can be easily approved and selected by the operator. In addition, the peripheral shape of the cut test paint film is more fixed, and the phenomenon of irregular and non-circular peripheral effect generated by manual operation in the prior art can not occur, so that the test data is more stable, and the reliability of the adhesive force of the paint film measured by a pull-off method is greatly improved.

Because the polygon is easier to cut along the test column than circular, when cutting, the cutting depth and the stress can be more easily controlled than the circular cutting applied by the prior art. The polygonal shape will be more normative than the circular cut shape of the prior art. The uniform cutting shape and cutting depth can make the stress distribution more uniform in stretching, and the result stability of the test sample is better than that of the existing circular cutting.

Preferably, the bonding surface of the test column is octagonal in shape.

Preferably, the bonding surface of the test post is hexagonal in shape.

The other end of the test column is not limited in structural shape and cross-sectional shape, and can be polygonal, circular and the like as long as the other end of the test column can be matched with the clamp for fixing.

The present invention will be described in more detail with reference to the following embodiments.

Drawings

For a better understanding of the present invention, reference is made to the accompanying drawings, in which:

FIG. 1 is a schematic illustration of a test column and test sample used in the prior art;

FIG. 2 is a schematic illustration of another prior art test column and test sample;

FIG. 3 is a schematic illustration of a test column and sample used in yet another prior art;

FIG. 4A is a perspective view of a prior art test column;

FIG. 4B is a schematic illustration of the adhesive side of a test column as used in the prior art;

FIGS. 4C to 4E are schematic drawings of paint film scratches after cutting the paint film with a knife according to the prior art;

figure 5A is a perspective view of a test column according to a first embodiment of the present invention in use;

figure 5B is a schematic illustration of a test post bonding surface according to a first embodiment of the present invention;

figure 6A is a perspective view of a test column according to a second embodiment of the present invention; and

figure 6B is a schematic illustration of a test post bonding surface according to a second embodiment of the present invention.

Detailed Description

The following describes an embodiment of the present invention in detail with reference to fig. 5A to 6B.

The utility model discloses a test column is fixed in on the base of pulling force machine through anchor clamps, and the concrete shape and the size of anchor clamps, base can adopt those shapes and sizes that present in the field, or those that can think about without the creative work of technical staff in the field.

[ first embodiment ]

Fig. 5A and 5B show a first embodiment of the present invention, wherein fig. 5A is a perspective view of a use state of the test column according to the first embodiment of the present invention, and fig. 5B is a schematic diagram of a bonding surface of the test column according to the first embodiment of the present invention.

As shown in the drawings, according to the first embodiment of the present invention, the bonding surface of the test column 1 has an octagonal shape, and each side has a linear shape.

Thus, after the adhered surface of the test column 1 and the paint film/coating 3 of the substrate 4 are adhered together by the adhesive layer 2, the paint film/coating 3 and the adhesive layer 2 on the test sample substrate 4 are cut along the outer periphery of the test column 1 by a cutter, at which time the cutter can travel straight along the outer periphery of the adhered surface, stop traveling when two edges meet, turn around, travel straight along the other edge until cutting is performed along all eight edges. The cutting operation of the paint film/coating 3 and the adhesive layer 2 is now complete. Compare along circular periphery cutting with the current cutter, the utility model discloses the structure of test post can make the cutting operation go on easily.

After cutting, the paint film/coating bonded on the bonding surface of the test column is separated from the residual paint film/coating at other positions on the base material through the cutting grooves, and the cutting grooves formed in the way are regular in shape and fit with the peripheral shape contour of the bonding surface of the test column, so that the situation that the cutting grooves are too long and extend into the paint film/coating outside the periphery of the bonding surface is avoided.

Thus, when a pull-off test is performed, a pull-off force is applied perpendicularly to the bond paint film/coating through the test column and is transmitted between the bond paint film/coating and the substrate, the perpendicular force causing the two to separate, and the pull force value detected at this time can be indicative of the amount of adhesion of the bond paint film/coating to the substrate.

Compare with current circular cutting, the utility model discloses a cut groove can not cause the deviation influence to the detached process of bonding film/coating and substrate, and data is reliable.

[ second embodiment ]

Fig. 6A and 6B show a second embodiment according to the present invention, wherein fig. 6A is a perspective view of a test column according to the second embodiment of the present invention, and fig. 6B is a schematic view of a test column bonding surface according to the second embodiment of the present invention.

As shown, according to the second embodiment of the present invention, the bonding surface of the test column has a hexagonal shape, and each side has a linear shape.

For the other end of the test column, although the embodiment of the present invention shows the same structure and cross-sectional shape as the end where the bonding surface is located, the structure shape and cross-sectional shape are not limited by the embodiment, and the two ends of the test column may have different shapes. For the end part of the non-bonding surface in the test column, the section can be polygonal, circular and the like, as long as the structure can be matched with the clamp for fixing.

While the present specification describes particular embodiments of the present invention, the present invention is not limited to the particular embodiments disclosed, and it will be apparent to those skilled in the art that various changes may be made without departing from the scope of the invention as defined in the following claims.

Claims (4)

1. A pull-off adhesion test device comprising:

the tensile testing machine is provided with a base;

a clamp; and (c) a second step of,

one end of the test column is fixed on the base through the clamp, the other end of the test column is provided with a bonding surface for cementing the test sample, the bonding surface is a flat surface,

the method is characterized in that:

the bonding surface of the test column is polygonal in shape.

2. A pull-apart adhesion test device according to claim 1, wherein:

the bonding surface of the test column is octagonal in shape.

3. A pull-apart adhesion test device according to claim 1, wherein:

the bonding surface of the test column is hexagonal in shape.

4. A pull-apart adhesion test apparatus according to claim 1, wherein:

the structure of the one end of the test column is matched with the clamp.

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