JPH1016116A - Repeatedly bondable and separable adherend and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily obtain an adherend, which can bond with and separate from each other repeatedly, by a method wherein thermoplastic resin powder is uniformly dispersedly applied on at least one of adherends and then the adherends are heat-fused together. SOLUTION: When adherends 1 are heated and bonded together under the state that thermoplastic resin is employed as adhesive, a large bonding strength is obtained but the re-use becomes impossible once they are separated from each other. So, after thermoplastic resin powder 2 (henceforth expressed as resin powder) is uniformly dispersed and applied onto at least one adherend 1, the adherends 1 are heat-fused together. In this case, as the thermoplastic resin powder 2 used as adhesive, resin powder, which holds a shape even being heated and does not spread flat, is preferable and ultra-high-molecular weight polyolefin resin powder is preferably used. Further, non-thermoplastic resin covered with the thermoplastic resin or inorganic mater covered with the thermoplastic resin such as calcium carbonate covered with modified polyolefin has the similar action effect as mentioned above.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an adhesive which can be easily adhered / peeled repeatedly and a method for producing the same.

[0002]

2. Description of the Related Art Conventionally, when a thermoplastic resin is used as an adhesive and the objects to be bonded are heated and bonded together, or when the thermoplastic resins themselves are directly heated and pressed together, the bonding strength can be increased. However, as shown in FIG. 2, there is a disadvantage that once peeled, it cannot be used again.

That is, FIG. 2 shows an example of a conventional adhesive body, in which (A) shows a state before peeling, and (B) shows a state after peeling. In the figure, 1 is an adherend, 2 ′
Is an adhesive layer. As shown in FIG. 2B, when the adherends 1 and 1 are pulled up and down and peeled off, interfacial destruction occurs in the adhesive layer 2 ′. The ones cannot be glued together and therefore cannot be used again as glue.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned drawbacks of the prior art and to provide an adhesive body which can be easily adhered / peeled repeatedly and a method for producing the same.

[0005]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to achieve the above object, and as a result, a non-thermoplastic resin or a thermoplastic resin previously coated with a thermoplastic resin powder or a thermoplastic resin on an adherend. An inorganic substance coated with a thermoplastic resin is applied so as to be uniformly dispersed, and the objects to be bonded are thermally fused (heat-sealed) to obtain an adhesive body which can be easily and repeatedly bonded / peeled. This led to the completion of the present invention.

That is, the bonded body of the present invention is obtained by heat-sealing the adherends applied so that the thermoplastic resin powder is uniformly dispersed on at least one of the adherends.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION As a thermoplastic resin powder (hereinafter referred to as "resin powder") used as an adhesive in the present invention, a resin powder which retains its shape even when heated and does not spread in a plane is selected. It is desirable to do. Examples of the resin powder having such properties include modified polyolefin resin powder, and a particularly preferred specific example is ultra-high molecular weight polyolefin resin powder (Miperon XM-200, manufactured by Mitsui Petrochemical Co., Ltd.). it can. Further, a non-thermoplastic resin coated with a thermoplastic resin or an inorganic substance coated with a thermoplastic resin (these are also referred to as “resin powder” hereinafter) have the same effect. For example, a modified polyolefin-coated calcium carbonate powder may be used.

The adhesive of the present invention is prepared by applying a resin powder to at least one of the surfaces to be adhered so that the resin powder is uniformly dispersed, and heating the objects by an air heating oven or the like. It can be manufactured by fusing.

[0009]

In the adhesive body of the present invention, since the resin powder functions as an adhesive, it adheres to the adherend not at the surface but at points. Therefore, there is little possibility that the material to be adhered may be destroyed at the time of peeling, and even if the material is destroyed, the number of locations is small and small.

The above operation will be described with reference to the drawings.
FIG. 1 shows an example of the adhesive body of the present invention, and FIG.
Shows a state before peeling, and (B) shows a state after peeling.
In the figure, reference numeral 1 denotes an adherend, and 2 denotes a resin powder.
As shown in FIG. 1B, when the objects 1 are pulled up and down, the objects 1 are easily separated. Then, even after peeling, the resin powder 2 is uniformly dispersed on the adherends 1, 1, and by heating again, the adherends 1, 1 can be bonded to each other in a dot-like, that is, partially, Adhesion and peeling can be repeated.

[0011]

EXAMPLE An ultra-high molecular weight polyolefin resin powder (Miperon XM-200, manufactured by Mitsui Petrochemical Co., Ltd.) was applied on an EPDM sponge rubber (ethylene-propylene-diene copolymer synthetic rubber) in an amount of 0.2 to 5 mg per cm ^2. And heated at 140-200 ° C. Since the ultrahigh molecular weight polyolefin resin powder has a large molecular weight, even if it is heated to a temperature at which heat fusion is possible, it does not melt and spread in a planar shape, and retains the original powder form. Then, this EPD
Another untreated EPDM sponge rubber substrate was brought into close contact with the resin powder coated surface of the M sponge rubber substrate, and heated at 140 to 200 ° C in an air heating oven to be heat-sealed. The thus obtained bonded body could be easily and repeatedly bonded / peeled.

[0012]

As described above, since the adherend of the present invention is in a state where the adherends are weakly and partially adhered to each other, the adherend can be easily peeled off from the adhesive interface. At the same time, adhesion / peeling can be performed easily and repeatedly. In addition, the adhesive (peeling) strength can be adjusted by changing the amount of fusion (that is, the amount of resin powder applied).

[Brief description of the drawings]

FIG. 1 is an explanatory view showing an example of the adhesive body of the present invention, in which (A) is an explanatory view showing a state before peeling, and (B) is an explanatory view showing a state after peeling.

FIGS. 2A and 2B are explanatory diagrams showing an example of a conventional adhesive body, wherein FIG. 2A is an explanatory diagram showing a state before peeling, and FIG. 2B is an explanatory diagram showing a state after peeling.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Adherend 2 Resin powder 2 'adhesive layer

Claims (7)

[Claims] 1. An adhered body obtained by heat-sealing adherends applied so that thermoplastic resin powder is uniformly dispersed on at least one of the adherends. 2. The bonded body according to claim 1, wherein the thermoplastic resin powder is a thermoplastic resin powder which retains its shape even when heated and does not spread in a plane. 3. The bonded body according to claim 2, wherein the thermoplastic resin powder which retains its shape even when heated and does not spread in a plane is an ultra-high molecular weight polyolefin resin powder. 4. A method of thermally melting non-thermoplastic resin coated with a thermoplastic resin or inorganic material coated with a thermoplastic resin on at least one of the adherends so as to uniformly disperse them. Adhesive body worn. 5. The adhesive according to claim 4, wherein the inorganic substance is calcium carbonate powder. 6. The bonded body according to claim 1, wherein the object to be bonded is EPDM sponge rubber. 7. A method of applying a thermoplastic resin powder on at least one of the adherends in advance so as to be uniformly dispersed, and heat-fusing the adherends by heating in an air heating oven or the like. Manufacturing method of the bonded body.