JPS6053076B2 - Method and device for producing sheet adhesive - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method and an apparatus for producing a sheet adhesive formed by impregnating an impregnable base material (carrier material) with an adhesive composition.

Conventionally, as a method for manufacturing this type of sheet-like (sometimes called film-like) adhesive, a latent curable adhesive composition (hereinafter referred to as the adhesive composition) such as an epoxy resin is mixed with a suitable organic solvent or water. The impregnable base material is impregnated with the solution by dissolving or dispersing it in the solution and immersing the impregnable base material in this solution, or by applying the solution to the surface of the impregnable base material by spraying or the like. A generally known method is to dry and remove the solvent in a subsequent step so that the adhesive composition remains in the impregnable substrate.

This method of using a solvent requires a solvent drying process and also requires a dryer, solvent recovery device, or solvent treatment device in the manufacturing equipment, which has the disadvantage of increasing equipment costs and operating costs. It was hot. Furthermore, when organic solvents are used, there are problems such as sanitary problems due to vaporized gases and the risk of fire due to their flammability. ;
An object of the present invention is to provide a method and apparatus for producing a sheet adhesive that solves the above problems by impregnating an impregnable base material with an adhesive composition without using a solvent.

Hereinafter, the manufacturing method and apparatus according to the present invention will be explained based on embodiments shown in the drawings.

FIG. 1 shows a first embodiment of the present invention, in which numeral 1 indicates a releasable material such as release paper (hereinafter referred to as release material), and 2 indicates a releasable liner (hereinafter referred to as liner) consisting of release paper, polyethylene film, etc. 3 is an impregnable base material (referred to as a chemical base material) made of nonwoven fabric, glass cloth, woven fabric, cheese cloth (all coarse mesh), etc., and each is wound into a roll. . 5 is a heatable coating roll; 6 is a coater including a doctor knife, a vibe coater, a roll coater, a flow coater, a reverse coater, etc. arranged above the coating roll 5 with a predetermined gap;
The release material 1 is fed into the gap via a guide roll 7 with the coating roll 5 along it.

8 is a heating roll, 9 is a nip roll, 10 and 11 are guide rolls, 12 is a cooling roll, 13 is a release material winding roll that winds up the release material 1, and 14 is a product roll that winds up the obtained sheet adhesive. It is a tori roll.

4 is a latent curable adhesive composition that is solid or highly viscous at room temperature, and a composition containing a thermosetting epoxy resin as a main component is preferably used.

As such a latent curable epoxy resin composition, 1
Solid and liquid epoxy resins with at least two or more epoxy groups in the molecule (e.g. bisphenol type epoxy resin, novolac type epoxy resin, etc.) are stable for a long time at room temperature when mixed with epoxy resin, but if heated. It consists of a so-called latent curing agent (for example, BF3, monoetheramine salt, dicyandiamide, acid anhydride, imidazole compound, etc.) that reacts immediately in the case;
If necessary, cure accelerators such as tertiary amines may be added, or fillers such as phenol resin, nitrile rubber, butadiene rubber, modified products thereof, finely divided silica, aluminum powder, etc. may be added. It will be done. Further, appropriate liquid and solid compositions are selectively blended to obtain a single composition that is solid or highly viscous at room temperature. The adhesive composition 4 is heated in advance using a suitable heating device (not shown) to soften it to a viscosity suitable for impregnation.

This heating temperature varies depending on the type of adhesive composition. When a latent curable epoxy resin composition is used as the composition 4, it is softened to an appropriate viscosity by heating to 30 to 7CfC1, preferably 45 to 55C. The softened composition 4 is supplied onto the coater 6 and a heat insulation jacket 15 provided at the rear of the coating roll 5. The temperature of the heat insulation jacket 15 is adjusted to maintain the softening of the adhesive composition 4. The surface temperature of the coating roll 5 and coater 6 is set to be about the same as that of the heat insulation jacket 15,
Moreover, the gap between the roll 5 and the coater 6 can be adjusted.

The coating roll 5, heating roll 8, nip roll 9,
The cooling roll 12, the product take-up roll 14, and the release material take-up roll 13 are each rotated in the direction of the arrow to release the release material 1,
Liner 2 and substrate 3 are moved. The adhesive composition 4 passes through the gap between the adhesive composition 4 and the coater 6 while contacting the surface of the release material 3 along the coating roll 5, and is coated onto the release material 1 to a predetermined thickness. Subsequently, the release material 1 coated with the adhesive composition 4 is sent between a heating roll 8 and a nip roll 9, and is transferred together with the base material 3 and liner 2 to both rolls 8, 9.
caught in between.

The adhesive composition 4 coated on the release material 1 is transferred to the heating roll 8
During this time, it is further softened to a viscosity that allows it to be easily impregnated into the base material 3 by the heating roll 8. Therefore, the temperature of the heating roll 8 is set to be about 15° C. higher than that of the heat insulation jacket 15 and coater 6. The base material 3 is superimposed from above on the adhesive composition 4 on the release material 1 on the circumference of the heating roll 8 via the guide roll 16, and at this time, the release material 1 on the circumference of the heating roll 8 and Utilizing the circumferential length difference between the base material 3 and the base material 3, the adhesive composition is brought into contact with the base material 3 without applying excessive mechanical pressure.
(see figure). As a result, the adhesive composition 4 is impregnated into the base material 3. Since this impregnation action progresses from one side of the base material 3, that is, the surface on the heating roll 8 side, to the other surface, the gas contained in the base material 3 is expelled at this time. When the adhesive composition 4 oozes out onto the surface of the base material 3,
The liner 2 that has been supplied to the nip roll 9 via the guide roll 17 is lightly pressed onto the base material 3 by the nip roll 9, and a gas is created between the base material 3, the adhesive composition on the surface, and the liner 2. In addition to not intervening
The impregnation of the adhesive composition is made uniform, and the thickness of the sheet-like adhesive S made of the base material 3 and the adhesive composition 4 is controlled. The release material 1 , the adhesive composition 4 , the base material 3 , and the liner 2 which are sandwiched between the heating roll 8 and the nip roll 9 and integrated into a sheet form are attached to the guide roll 10 .
, 11 to the cooling roll 12.

The cooling roll 12 returns the softened adhesive composition to its original solid or highly viscous state. cooling roll 12
The surface temperature is set to about 15 to 20C. The product thus obtained, namely the product 21 consisting of the sheet-like adhesive S consisting of the base material 3 and the adhesive composition 4 impregnated into the base material 3, and the liner 2 covering one side of the sheet-like adhesive S, passes through the guide roll 18. The release material 1 is wound onto a product take-up roll 14 via a guide roll 19, and the release material 1 is wound onto a release material take-up roll 13 via a guide roll 19. In the embodiment shown in FIG. 1, the release material 1 is removed and the liner 2 is wound together with the product.

In this case, the liner 2 is releasable on both sides, and the release material 1 is releasable on one side. In another embodiment, release material 1 may be left on the product and liner 2 may be removed (in this case, release material 1 is removable on both sides), or if necessary, release material 1 and liner 2 may be removed. Both can be left on the product. FIG. 2 shows a second embodiment of the present invention, in which the release material is an endless belt.

Note that the same members and the same functions as those in FIG. 1 are indicated by the same reference numerals. In the figure, the release material 1 is constructed as an endless belt stretched between a coating roll 5, a heating roll 8, and a cooling roll 12. In this embodiment, the base material 3 is supplied while being slightly held by the nip roll 9, but it may also be held by the heating roll 8 side as in Fig. 1 (the embodiment shown in Fig. 1). But you can also hold it in nip roll 9). The release material 1 is driven by the rotation of each of the rolls 5, 8, and 12, and after the softened adhesive composition 4 is applied onto the release material 1 in the same way as in the embodiment shown in FIG. After being impregnated into the base material 3 by being sandwiched between the nip roll 9 and cooled by the cooling roll 12, the liner 2 and the sheet adhesive S are wound around the product winding roll 14 via the guide roll 20. The release material 1 is removed and rotated while being removed under the cooling roll 12, and is used repeatedly.

After applying the adhesive composition 4 onto the release material 1 as described above, the adhesive composition 4 and the base material 3 are sandwiched between the heating roll 8 and the nip roll 9, as shown in FIG. In this manner, the composition 4 uniformly enters the minute gaps 3a of the base material 3, and a uniform and flattened sheet adhesive S is obtained.

Further, by adjusting the gap between the heating roll 8 and the nip roll 9, a sheet adhesive having an arbitrary thickness can be obtained. Next, a specific example of manufacturing a sheet adhesive using the above method will be described.

Production Example 1 A sheet adhesive was produced using the method according to the first example (FIG. 1).

As a latent curable adhesive composition, Sumiepoxy ELA-
128 (Sumitomo Chemical Co., Ltd.) 50 copies, Epicote #10
01 (Shell Chemical Co., Ltd.) 5 was heated and mixed, and 4 parts of dicyandiamide as a latent curing agent and 0.5 part of BF,-monoethylamine complex as a curing accelerator were kneaded in a kneader. used.

Also, as the release material 1, the thickness is 0? Single-sided release paper, base material 3
A coarse nonwoven fabric with a thickness of 0.15 was used as the liner 2, and a polyethylene film with a thickness of 0.1'' was used as the liner 2. The surface temperature of the coating roll 5 and the coater 6 was set at 5(s), the surface temperature of the heating roll 8 was set at 65°C, and the surface temperature of the cooling roll 12 was set at 15°C. The gap between the coating roll 5 and the coater 6 is 0.55T greater than the thickness of the release material 1! gl
& wide, and the gap between the heating roll 8 and the nip roll 9 was made 0.30 wider than the total thickness of the release material 1 and the liner 2. The speed of the manufacturing process, ie, the moving speed of the release material 1, was 1.0 TrL/min. The adhesive composition was softened by heating at 50°C in advance, and then supplied onto the heat insulation jacket 15 set at 50'C.

The base material 3 and the liner 2 were held by a heating roll 18 and a nip roll 9, respectively, by applying tension to the extent that no wrinkles were caused by guide rolls 16 and 17. As the release material 1 moves, the adhesive composition 4 is deposited on the release material 1 at a rate of 0.0%.
It was coated to a thickness of 55Tn.

The adhesive composition 4 is further softened on the heating roll 8 and becomes easily impregnable, and it impregnates into the base material 3 that lightly contacts the upper surface of the adhesive composition 4, and then passes between the heating roll 8 and the nip roll 9. At this point, a sheet-like adhesive layer was sandwiched between release material 1 and liner 2, and they were integrated. Subsequently, while passing through the cooling roll 12, the adhesive composition returns to its original highly viscous state, and the release material 1 is transferred to the release material take-up roll 13, and the sheet adhesive is transferred together with the liner 2 to the product take-up roll 14. was wound up. The obtained sheet adhesive S has a thickness of 0.35? It was a uniform product. Production Example 2 A sheet adhesive was produced using the method according to Example 2 (Fig. 2), and the TO latent curable adhesive compositions included Sumiepoki ELA-128, 0 parts, Epicoat #1001,
4 m1 and 20 parts of Epikote #1004 (Shell Chemical Co., Ltd.) were heated, melted, mixed, and mixed with 4 parts of dicyandiamide as a latent curing agent and 0.5 part of benzyldimethylamine as a curing accelerator, and kneaded in a kneader. used.

Further, as the release material 1, a single-sided release paper formed into an endless belt shape was used, and as the base material 3, coarse glass cloth, liner 1, and polyethylene film were used. The surface temperature of the thermal jacket 15, coating roll 5, and coater 6 was set at 55°C, the surface temperature of the heating roll 8 was set at tin°C, and the surface temperature of the cooling roll 12 was set at 20°C. The gap between the coating roller 5 and the coater 6, the gap between the heating roll 8 and the nip roll 9, the speed of the process, etc. were the same as in Production Example 1. The adhesive composition was previously heated to 55° C. to soften it, and then supplied onto the heat insulation jacket 15 .

The thickness of the obtained ζ sheet adhesive is 0.35? It was a uniform product. According to the present invention, as described above, the latent curable adhesive composition is softened by heating and is sandwiched between heated rolls together with the impregnating base material to impregnate the base material. As such, there is no need to use a solvent, so there is no need for a solvent drying process, which simplifies the process, and also eliminates all drying equipment and associated safety and health measures and pollution control equipment. This has the advantage of simplifying the equipment.

Furthermore, since the adhesive composition was softened and applied uniformly onto the release material and then impregnated into the impregnating base material, the basis weight of the adhesive composition was uniform, and therefore the adhesive composition was uniformly applied. As the product is obtained, the adhesive composition comes into contact with one side of the impregnable base material, and the impregnation progresses toward the other side of the base material due to the pinching action of the heating roll. Gases in the material are driven out and gases are prevented from becoming trapped inside the adhesive. Furthermore, since it is pressed between heating rolls and nip rolls, a uniform and flat sheet can be obtained, and sheet adhesives of any thickness can be obtained by simply adjusting the gap between heating rolls and nip rolls. effective.

[Brief explanation of the drawing]

Fig. 1 is a side view showing a first embodiment of the apparatus for implementing the method of the present invention, Fig. 2 is a side view of the second embodiment same as above, and Fig. 3 is an enlarged sectional view of the heating roll and nip roll portion. It is. DESCRIPTION OF SYMBOLS 1...Peelable material, 2...Peelable liner, 3...Impregnable base material, 4...Adhesive composition, 5... ... Coating roll, 6 ... Coater, 8 ... Heating roll, 9 ... Nip roll, 15 ... Heat insulation jacket, S ...
...Sheet adhesive.

Claims (1)

[Claims] 1. A step of uniformly applying a latent hardening adhesive composition that is solid or highly viscous at room temperature onto a removable material by heating and softening it to an extent that it does not harden in advance, and the adhesive composition. supplying the releasable material coated with the adhesive between a heating roll and a nip roll, and supplying an impregnable base material and a releasable liner between the two rolls to impregnate the impregnable base material with the adhesive composition. and a step of cooling an impregnated base material impregnated with an adhesive composition together with a release material and a release liner. 2. A coating roll and a coater for coating a heat-softened adhesive composition onto a removable material, and a coating roll and a coater provided at the rear of the coating roll and coater to hold the heat-softened adhesive composition. a heat insulating jacket; a heating roll that guides the removable material coated with the adhesive composition along its circumferential surface and softens the adhesive composition to a temperature suitable for impregnation; A nip roll is provided facing the heating roll and sandwiches the impregnable base material between the releasable material and the releasable liner; 1. An apparatus for producing a sheet adhesive, comprising: a cooling roll for cooling an adhesive composition, together with a release material and a release liner.