JPH06241984A - Method for evaluating degree of adhesion of pressure sensitive adhesive tape to body - Google Patents

Abstract

PURPOSE:To measure the adhesion to a body to which adhesive tape is stuck accurately by providing an intermediate layer consisting of silicon grease or negative ion surface-active agent on the surface of the body and then a marker layer consisting of a specific metal or carbon thin film on it. CONSTITUTION:A liquid solution of toluene grease with a toluene liquid solution concentration of 1-2wt.% is coated on the surface of a body to which adhesive tape is stuck or an aqueous solution of negative ion active-surface agent with an aqueous solution concentration of 1-2wt.% is coated on the surface of the body. A marker layer consisting of a metal or carbon thin film which is 10-100nm or preferably 20-40nm thick is formed on the surface of the intermediate layer coated on the surface of the body to be adhered to. The viscous surface of an adhesive tape is pressed and applied to the marker layer, is left for a certain amount of time, and then is peeled off. The degree of adhesion is calculated from the ratio of the area of the marker layer adhered to the viscous surface to the total area of viscous surface for judgment.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for evaluating the degree of adhesion of an adhesive tape to an adherend, and more particularly to a method for evaluating the degree of adhesion to an adherend having fine irregularities on its surface.

[0002]

2. Description of the Related Art When evaluating the adhesiveness of an adhesive tape for an adherend having fine irregularities on its surface, the degree of adhesion between the adherend and the adhesive tape is important in addition to the adhesive strength of the adhesive itself. It becomes a factor. That is, if the unevenness on the surface is large, the adhesion is lowered, and if the unevenness is small, the adhesion is improved.

Therefore, if the adhesiveness of the adhesive tape can be accurately measured, the adhesiveness of the adhesive tape can be correctly evaluated by examining the adhesiveness and other adhesive physical properties (initial adhesive strength, etc.) together, and the adherend can be adhered. Since various adhesive tapes can be designed according to the type and shape of, it is a very effective evaluation technique.

[0004] The degree of the powdery powdering phenomenon (powdering) of the surface coating during the molding process of the surface-treated metal plate is determined by the amount of the powdery coating (powder) that adheres to the adhesive transparent tape adhered to the molding site. There is disclosed a method of quantitatively measuring by optically measuring (JP-A-62-10).
0646).

However, the above method is not an evaluation method for an adhesive tape, but a new method for evaluating the adhesion of the adhesive tape is desired.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above drawbacks, and its object is to accurately measure the degree of adhesion of an adhesive tape to an adherend by a relatively simple operation. An object of the present invention is to provide a method for evaluating the degree of adhesion of an adhesive tape to an adherend, which is capable of

[0007]

The intermediate layer comprising silicone grease or anionic surfactant used in the present invention is provided on the surface of an adherend.

As a method for providing the intermediate layer made of the above-mentioned silicon grease on the adherend, for example, a method in which a solution of silicon grease in toluene is applied to the surface of the adherend and dried is mentioned. Considering that the concentration of the toluene solution of the silicone grease is thin and uniform,
1-2% by weight is preferred.

As a method for providing the adherend with an intermediate comprising the above anionic surfactant, for example, there is a method of applying an aqueous solution of an anionic surfactant on the surface of the adherend and drying it. The concentration of the aqueous solution of the anionic surfactant is preferably 1 to 2% by weight in view of thin and uniform coating.

Examples of the anionic surfactant include alkylbenzene sulfonate, alkyl ether sulfate ester salt, α-olefin sulfonate, and the like.

Examples of the method for forming the intermediate layer include a method in which the adherend is dipped in a toluene solution of silicon grease or an aqueous solution of an anionic surfactant and dried.

The marker layer used in the present invention is formed of a metal or carbon thin film, and is provided on the intermediate layer.

Examples of the metal include gold, platinum,
Examples include silver and gold / palladium.

As a method of forming the marker layer,
For example, known methods such as ion sputtering and vacuum deposition are used.

When the thickness of the marker layer is thin, it is difficult to form it uniformly on the surface of the adherend, and when it is thick, there is a risk of changing the fine uneven structure on the surface of the adherend.
It is limited to 0 to 100 nm, preferably 20 to 40 nm
Is.

In the present invention, the evaluation of the adhesion to the adherend is carried out by the following method. (1) An intermediate layer is provided on the surface of the adherend, and a marker layer is further provided on the intermediate layer. (2) The pressure-sensitive adhesive surface of the pressure-sensitive adhesive tape is pressed and attached to the marker layer, left for a certain period of time, and then the pressure-sensitive adhesive tape is peeled off. (3) The area of the marker layer attached to the adhesive surface of the adhesive tape is measured. (4) From the area a of the marker layer adhered to the adhesive surface and the area A of the entire adhered adhesive surface, the adhesion is calculated by the following formula. Adhesion (%) = (a / A) × 100

The area of the marker layer attached to the adhesive surface can be measured by, for example, taking a photograph of the adhesive surface with a stereomicroscope and subjecting the obtained photograph to image processing.

[0018]

EXAMPLES Examples of the present invention will be described below. (Examples 1 to 5) (1) Concavo-convexity of adherend The average roughness of the center line of this adherend was measured according to JIS B0601 using a decorative plywood having fine irregularities on the surface as an adherend. Then, the degree of unevenness of the adherend was used.

(2) Adhesion of adherend: A decorative plywood (30 × 50 mm) as an adherend is dipped in a 1.5 wt% toluene solution of silicone grease (“APIEZON N” manufactured by APIEZON PRODAUCTS) and dried. After that, with the ion sparring device,
Marker layer (thickness: 30 nm) by depositing gold on the intermediate layer
Was formed. Then, using a laminating roll, an air pressure of 3.5 to 4 kgf / cm ² and a speed of 1 m / min, and an adhesive tape (“Protect Tape” manufactured by Sekisui Chemical Co., Ltd.) on the adherend.
After sticking, the adhesive tape was peeled off by leaving it for 2 hours, and the gold attached to the peeled adhesive tape was photographed under a stereoscopic microscope. This photo is an image processing device ("LA-5" manufactured by PIAS).
55 "), the adhesion was calculated from the area of gold obtained by the treatment, and the results are shown in Table 1.

(3) Initial adhesive strength The initial adhesive strength of the adhesive tape used in (2) can be determined according to JIS Z
According to 0237, the 180 degree peel strength was measured, and the relationship between the initial adhesive force and the degree of adhesion (gold adhesion area) is shown in FIG.

(Examples 6 and 7) An acrylic paint-coated steel plate (30 x 50 mm) was used as the adherend instead of the decorative plywood, and the adherend was an anionic surfactant ("Mama Royal" manufactured by Lion Corporation). The degree of unevenness, the degree of adhesion and the initial adhesive strength were measured by the same method as in Example 1 except that the intermediate layer was formed by dipping in 1.5% by weight of an aqueous solution and drying. Table 1 shows the relationship between the initial adhesive force and the degree of adhesion (gold adhesion area) in FIG.

[0022]

[Table 1]

From Table 1, as the degree of unevenness of the adherend increases, the degree of adhesion decreases. Further, from FIGS. 1 and 2, as the initial adhesive force of the pressure-sensitive adhesive tape increases, the degree of adhesion improves, and the relationship between the two is linear.

The method for evaluating the degree of adhesion of an adhesive tape to an adherend according to the present invention can measure the degree of adhesion between the adhesive tape and an adherend relatively easily and accurately. Provide evaluation technology useful for development of adhesive processed products.

[Brief description of drawings]

FIG. 1 is a graph showing the relationship between the initial adhesive force and the degree of adhesion (gold adhesion area) of an adhesive tape when the adherend is a decorative plywood.

FIG. 2 is a graph showing the relationship between the initial adhesive force and the degree of adhesion (gold adhesion area) of the adhesive tape when the adherend is an acrylic coated steel plate.

Claims (1)

[Claims] 1. An intermediate layer made of silicon grease or an anionic surfactant is provided on an adherend, and a marker layer made of a metal or carbon thin film having a thickness of 10 to 100 nm is provided on the intermediate layer. After that, the adhesive surface of the adhesive tape is stuck on the marker layer, the adhesive tape is peeled off after standing for a certain period of time, and the ratio of the area of the marker layer adhered to the adhesive surface and the area of the entire adhered adhesive surface A method for evaluating the degree of adhesion of an adhesive tape to an adherend, which comprises evaluating the degree of adhesion.