TWI577558B - The combination of composite sheet - Google Patents

Description

Composite sheet bonding method

The invention relates to a method for combining composite plates, in particular to a method for bonding a plurality of adjacent composite plates by using bonding means as a composite plate for a vehicle body or a building.

Generally, the body of a vehicle is mostly made of composite sheets, and when it is desired to raise or enlarge a composite sheet, a plurality of composite sheets are usually joined together to form a composite sheet assembly of a larger area. In order to fix the composite plates that are connected to each other, a variety of different bonding methods have been developed in the industry.

Referring to Figures 1 and 2, a method for combining a plurality of composite sheets 1 is known. Each composite sheet 1 includes a core layer 11 and a first skin layer 12 and a bonded to opposite surfaces of the core layer 11. The second surface layer 13. The core layer 11 of each composite sheet 1 has a base section 111 and a mating section 112 formed at one end edge of the base section 111. The first surface layer 12 has a first overlapping section 121 correspondingly bonded to an outer side surface of the base section 111 and the butting section 112, and a side protruding from the side of the first overlapping section 121 The first bonding segment 122 outside the docking segment 112. The second skin 13 has a corresponding outer side bonded to the base segment 111 The second overlapping section 131 on the second overlapping section 131 and the second bonding section 132 connected to the side of the second overlapping section 131 and correspondingly bonded to the docking section 112.

When the adjacent composite sheets 1 are combined, a step of coating the lacquer layer is first performed on the outer side of the first overlapping section 121 and the first bonding section 122 of the first skin 12 of each composite panel 1 and The outer side of the second overlapping section 131 of the second skin layer 13 is painted to form a baking varnish layer 14 respectively, and the baking varnish layer 14 is not coated on the second bonding section 132 of the second surface layer 13. On the outer side. Then, a piece of the adhesive film 15 is adhered to one of the inner side surface of the first bonding section 122 and one of the outer side surfaces of the second bonding section 132. Finally, the adjacent composite sheet 1 is overlapped, so that the first bonding section 122 of the composite sheet 1 is overlapped on the outside of the second bonding section 132 of the adjacent composite sheet 1. The adhesive film 15 respectively Between each first bonding segment 122 and the second bonding segment 132 of the other composite sheet 1. Next, the glue film 15 is melted by a heating step, and after the molten glue film 15 is cooled, the adjacent composite sheets 1 are bonded and bonded.

The lacquer layer 14 is not formed on the outer side of the second bonding layer 132 of the second surface layer 13 in order to directly bond the adhesive film 15 to the surface of the second surface layer 13 of the composite board 1. To achieve a good bonding effect. However, the second surface layer 13 is not protected by the paint, so that the molecular structure of the material is unstable, and it is easy to change. The oxidized rust or the plate is easily damaged over a long period of time, resulting in unstable plate quality. It is therefore known that the method of bonding composite sheets 1 needs to be improved.

Accordingly, it is an object of the present invention to provide a bonding method for a composite panel which can achieve both sheet quality and adhesion and bond stability.

Therefore, the method for bonding the composite board of the present invention comprises: Step A: preparing two composite sheets, each composite sheet comprising a core layer, and a first surface layer and a second surface layer on opposite surfaces of the core layer, The core layer includes a base section and a mating section connecting one end of the base section, the first surface layer having a first overlapping section corresponding to an outer side surface of the base section and the mating section, and a A first bonding segment outside the abutting segment protrudes from a side of the first overlapping segment, the second surface layer having a second overlapping segment correspondingly coupled to the other outer side of the base segment, and a second bonding segment located at one end of the second overlapping segment and correspondingly coupled to the docking segment.

Step B: forming a first baking varnish layer on the inner side of the first bonding section of the first skin layer and the outer side surface of the second bonding section of the second skin layer, the first baking varnish layer comprising epoxy Resin or polyurethane; a second baking varnish layer is respectively formed on an outer side surface of the first skin layer and an outer side surface of the second splicing section of the second skin layer, and the second baking varnish layer on the second skin layer is not covered The first lacquer layer on the second bonding section.

Step C: moving the adjacent sides of the two composite sheets toward each other, respectively, so that the first bonding section of each composite sheet overlaps the outside of the second bonding section of another composite sheet, and The first bonding segment and the second bonding segment of the adjacent composite plate are bonded and bonded through a bonding layer, and the first bonding layer of each bonding layer on each first bonding segment and the adjacent one another Between the first lacquer layers on the second bonding section of the composite sheet.

The effect of the invention: the first surface layer and the second surface layer can form a complete protection for the first surface layer and the second surface layer, thereby avoiding oxidation corrosion of the first surface layer and the second surface layer, thereby stabilizing the sheet material and avoiding corrosion of the sheet. To ensure the quality of the board. And the first baking varnish layer contains epoxy resin or polyurethane, which can improve the adhesive bonding force between the first baking varnish layer and the bonding layer, so that the composite slab can be firmly bonded and bonded.

2‧‧‧Composite sheet

21‧‧‧ core layer

211‧‧‧ base segment

212‧‧‧ docking section

22‧‧‧ first surface

221‧‧‧first overlapping section

222‧‧‧First bonding section

23‧‧‧ second surface

231‧‧‧Second lap joint

232‧‧‧Second bonding section

24‧‧‧First paint finish

25‧‧‧Second paint layer

26‧‧‧Glued layer

261‧‧‧Glue film

262‧‧‧Binder

31~35‧‧‧Steps

Other features and effects of the present invention will be apparent from the following description of the drawings, wherein: Figure 1 is a cross-sectional exploded view of two known composite panels; Figure 2 is a schematic view of the two known composite panels FIG. 3 is a partial cross-sectional exploded view of a composite sheet assembly formed by combining a first embodiment of a composite sheet joining method of the present invention; FIG. 4 is a composite sheet assembly of the first embodiment; FIG. 5 is a schematic flow chart of the first embodiment of the present invention; FIG. 6 is a block flow diagram of the first embodiment; FIG. 7 is a block diagram of the composite plate of the present invention; A partial cross-sectional exploded view of a composite sheet composite formed by a second embodiment; FIG. 8 is a partial cross-sectional assembled view of the composite sheet assembly of the second embodiment; and FIG. 9 is a composite sheet of the present invention. A partial flow diagram of a third embodiment of the combined method.

Before the present invention is described in detail, it should be noted that in the following description, similar elements are denoted by the same reference numerals.

Referring to Figures 3 and 4, in a first embodiment of the method of joining composite sheets of the present invention, a composite sheet composite can be produced. The composite sheet assembly comprises at least two composite sheets 2 connected in parallel, and only the right side of the left composite sheet 2 is shown, and the assembly structure is located on the left side of the right composite sheet 2, and in the drawing The length and thickness of the composite sheet 2 can be shown only in a schematic view. The composite sheet 2 can be connected in different directions or can be increased in number. Therefore, the length, the thickness, the direction and the number of the sheets are not limited to the embodiment.

Each composite sheet 2 includes a core layer 21 and is individually bonded A first surface layer 22 and a second surface layer 23 on the upper and lower opposite surfaces of the core layer 21. The core layer 21 is a non-metal matrix hardened molded body made of a plastic material or a foaming agent added to the plastic material. The plastic material may be: polyethylene (PE), polypropylene (Polypropylene, Referred to as PP), or ethylene-vinyl acetate copolymer (EVA). The first surface layer 22 and the second surface layer 23 are all metal plates, and may be aluminum alloy plates, galvanized steel plates, galvanized steel plates, aluminum-zinc-magnesium steel plates, titanium alloy plates, copper alloy plates, stainless steel plates, zinc alloys. A rigid metal plate such as a plate or a painted steel plate.

The core layer 21 of each composite sheet 2 includes a base portion 211, and one end connected to the base portion 211 and adjacent to another composite sheet 2 Docking segment 212. In the following description, the direction toward the core layer 21 is inward, and the direction away from the core layer 21 is outward. The first surface layer 22 has a first overlapping portion 221 correspondingly coupled to the outer side of the base portion 211 and the mating portion 212, and a side portion of the first overlapping portion 221 protrudes outwardly from the butt portion The first bonding segment 222 outside the 212. The second surface layer 23 has a second overlapping section 231 correspondingly coupled to the other outer side surface of the base section 211, and a first end of the second overlapping section 231 and correspondingly coupled to the butting section 212. Two bonding sections 232. The length of the second bonding segment 232 corresponds to the first bonding segment 222.

Each composite panel 2 also includes three first lacquer layers 24 and two second lacquer layers 25 having a composition different from the first lacquer layer 24. The first baking varnish layer 24 is respectively located on an outer side surface of the first surface layer 22, an inner side surface of the first bonding layer 222, and an outer side surface of the second surface layer 23. The second baking varnish layer 25 is located on the outer side faces of the first skin layer 22 and the second skin layer 23, respectively. More specifically, the second lacquer layer 25 on the outer side of the first skin layer 22 covers the first lacquer layer 24 on the outer side of the first skin layer 22; on the outer side of the second skin layer 23 The second lacquer layer 25 covers the first lacquer layer 24 on the outer side of the second splicing section 231, but does not cover the first lacquer layer on the outer side of the second bonding section 232. twenty four.

The first baking varnish layer 24 and the second baking varnish layer 25 may be: polyester coating, Silicon modified polyester coating, acrylic coating, polyvinylidene fluoride (PVDF) coating, or fluorine. A coating of a copolymer of an olefin and an alkyl vinyl ether or ester (referred to as FEVE). Among them, the first paint layer 24 may be any of the above coatings, and further comprising an epoxy resin (Epoxy) or polyurethane (PU) to impart a certain adhesion to the first baking finish layer 24.

The composite sheet assembly further includes two glue layers 26, each of the glue layer 26 is located on the inner side of each first bonding section 222, and the second bonding layer of the adjacent composite sheet 2 Between the first painted layers 24 on the outer side of the 232. The bonding layer 26 is used for bonding and bonding the two composite sheets 2. The material of the bonding layer 26 may be: maleic anhydride grafted polyethylene, maleic anhydride grafted polypropylene, maleic anhydride grafted ethylene-vinyl acetate copolymerized. Materials such as materials, epoxy resins, or polyurethane adhesives.

Referring to Figures 3, 4, 5, 6, the method of this embodiment comprises the following steps:

Step 31: Prepare the two composite sheets 2, each composite sheet 2 comprising the core layer 21, the first skin layer 22 and the second skin layer 23.

Step 32: forming the first baking varnish layer 24 on the outer side surface of the first surface layer 22, the inner side surface of the first bonding layer 222, and the outer side surface of the second surface layer 23, respectively. In this embodiment, the first lacquer layer 24 on the outer side of the first surface layer 22 covers the outer side of the first splicing section 221 and the first bonding section 222, and the outer surface of the second surface layer 23 The first lacquer layer 24 on the side surface extends over the outer side of the second splicing section 231 and the outer side of the second bonding section 232. Next, a second lacquer layer 25 is formed on the outer side surface of the first skin layer 22 and the outer side surface of the second splicing section 231 of the second skin layer 23; of course, the first skin layer 22 and the second layer of the present embodiment The first paint layer 24 is provided on the outer side of the surface layer 23, so the second The lacquer layer 25 is located on the outer side of the first skin layer 22 and the second skin layer 23 across the first lacquer layer 24.

In the step of forming the first baking varnish layer 24 and the second baking varnish layer 25, the following sub-steps are included: first coating a baking varnish material, and then baking to dry and harden the baking varnish material to form the first baking varnish layer 24 With the second baking varnish layer 25. Therefore, the present invention requires a total of two coats of paint material and two bake steps. Of course, the paint materials used for the two coats are different, and the materials must be selected according to the desired first paint layer 24 and the second paint layer 25.

In addition, before the first baking layer 24 is formed on the inner side surface of the first bonding section 222 and the outer side surface of the second bonding section 232, the first layer may be firstly treated with chromate or phosphate. The inner side surface of the bonding section 222 and the outer side surface of the second bonding section 232 are surface-treated, and then the first baking varnish layer 24 is formed. The surface treatment method is to immerse the surface to be treated in a treatment liquid containing chromate or phosphate to react the surface to be treated with the treatment liquid to achieve a surface treatment effect. The surface has a polarity after surface treatment, and can form a concave-convex surface to enhance the bonding strength with the first baking varnish layer 24.

Step 33: For each composite sheet 2, a piece of adhesive film 261 (FIG. 5) is correspondingly adhered to one of the inner side surface of the first bonding section 222 and the outer side surface of the second bonding section 232. In this embodiment, the first adhesive layer 222 is affixed to the first adhesive layer 222, and the first adhesive layer 222 is spaced apart from the first adhesive layer 222. The bonding time of the adhesive film 261 is not limited, and may be adhered after the first baking varnish layer 24 is formed. It can be applied until the adjacent two composite sheets 2 are overlapped and overlapped.

Step 34: The adjacent sides of the two composite sheets 2 are then moved toward each other, and the first bonding sections 222 of each composite sheet 2 are respectively overlapped on the second bonding section of the adjacent composite sheet 2. The outer side of the 232 is such that each of the adhesive films 261 is interposed between each of the first bonding sections 222 and the second bonding section 232 of the other composite sheet 2. Specifically, the two composite sheets 2 are placed upside down, and the butting sections 212 of each other are adjacent to each other, and the first bonding section 222 of the left composite sheet 2 is overlapped on the right composite sheet 2 On the second bonding section 232, the first bonding section 222 of the right composite panel 2 is overlapped on the second bonding section 232 of the left composite panel 2.

Step 35: heating the glue film 261 to melt, and then cooling, so that each of the glue films 261 is hardened, and then each of the glue layers 26 is formed, so that the two composite sheets 2 can be bonded and bonded. The glue film 261 of the present embodiment has a melting point of about 90 ° C to 135 ° C, and the heating temperature of the glue film 261 can be 150 ° C to 200 ° C, and can be passed through a heat medium containing a heat medium. The roller presses the two composite sheets 2 to melt the binder film 261. The cooling step may be carried out at a cooling temperature of 10 ° C to 80 ° C, and may be cooled by a cold press roller containing a cold medium (for example, water at 10 ° C to 80 ° C). In design, the heating step can also be performed by means of laser, ultrasonic, high frequency, heat conduction, heat convection, hot air, electromagnetic or radiation heating. The cooling step may also be a cooling method such as liquid nitrogen or liquid carbon dioxide, which will not be described in detail herein.

The above only illustrates the overlapping structure of the side ends of the composite sheets 2 adjacent to each other, and the other side end structure of the composite sheet 2 can be The same as the above-mentioned lap joint structure or the reverse arrangement, of course, it may be flat and even without a lap joint structure, but the focus of the present invention is on the joint between the two composite sheets 2, so whether the other side end is provided with other composites. The lap joint structure of the sheet material 2, or the design of the edge of the sheet material without the lap joint structure, will not be described in detail herein.

In summary, the outer surface of the first surface layer 22 and the outer surface of the second overlapping portion 231 of the second surface layer 23 are covered by the second baking layer 25, and the first surface layer 22 is coated with the first baking layer 24. The inner side of the first bonding section 222 and the outer side of the second bonding section 232 of the second surface layer 23 can form a complete protection for the first surface layer 22 and the second surface layer 23, avoiding the first surface layer 22 and the second surface layer 22 The surface layer 23 is oxidized and rusted. Since the first bonding segment 222 and the second bonding segment 232 adjacent to the two composite sheets 2 must be bonded by the bonding layer 26, and the bonding layer 26 is bonded to the first baking layer 24, the The adhesive strength between the glue layer 26 and the first paint layer 24, and the first paint layer 24 of the present invention contains an epoxy resin or a polyurethane, which can enhance the adhesive bond with the glue layer 26, and thus is used to form the glue layer. The glue film 261 of 26 can be firmly adhered to the surface of the first baking varnish layer 24, and the glue film 261 forms the glue layer 26 after the subsequent heating and cooling steps, and also has good adhesion strength to enable the two composite sheets 2 Firmly bond and bond. Therefore, the method of the invention can make the composite sheet 2 firmly adhered, and at the same time protect the composite sheet 2 through the complete baking paint, thereby stabilizing the sheet material, avoiding corrosion of the sheet and ensuring the quality of the sheet.

It is further explained that the first baking varnish layer 24 is considered because the bonding matching degree and the adhesion strength between the first baking varnish layer 24 and the bonding layer 26 are considered. There is a need to add epoxy or polyurethane. The second paint layer 25 is located on the outer side of the first skin layer 22 and the second skin layer 23, and there is no need to bond with other layer bodies. Therefore, a coating material which is generally not added with epoxy resin or polyurethane can be used.

Referring to Figures 7 and 8, a second embodiment of the method of joining composite sheets of the present invention is substantially the same as the first embodiment, except that a second paint is formed on the outer side of the first skin 22 of the present embodiment. Layer 25, but no first paint layer 24 is formed. The first baking varnish layer 24 on the outer side surface of the second surface layer 23 of the embodiment covers only the second bonding section 232 without covering the second splicing section 231. Therefore, the second baking varnish layer 25 on the outer side surface of the second surface layer 23 of the present embodiment contacts and covers the outer side surface of the second splicing section 231.

The method and the effect of the present embodiment are substantially the same as those of the first embodiment. Moreover, the method of the embodiment may have other changes. For example, the first baking varnish layer 24 may be formed first, and then the second baking varnish layer 25 may be formed; or the second baking varnish layer 25 may be formed first, and then formed. The first baking finish layer 24.

Referring to FIG. 9, a third embodiment of the method for bonding composite sheets of the present invention is substantially the same as the first embodiment, except that the manner in which the glue layer 26 is formed and the manner of bonding between the two composite sheets 2 are shown.

The glue layer 26 of this embodiment is formed by hardening a viscous glue 262. In this embodiment, before the adjacent composite sheets 2 are overlapped, for each composite sheet 2, at least one of the inner side of the first bonding section 222 and the outer side of the second bonding section 232 is first. The first roast On the lacquer layer 24, a viscous glue 262 is applied, and after the adjacent composite sheets 2 are overlapped, the glue 262 is respectively interposed between each of the first bonding segments 222 and the second composite sheet 2 Between the bonding segments 232. After the two composite sheets 2 are overlapped, the glue 262 is dried and then hardened into the glue layer 26, so that the two composite sheets 2 can be bonded and bonded. Therefore, in this embodiment, the glue-like glue 262 is applied to the overlapping portions of the two composite sheets 2, and the adhesive effect is achieved after the glue 262 is dried. The adhesive 262 of the present embodiment and the first baking varnish layer 24 also have good adhesive bonding strength.

However, the above is only the embodiment of the present invention, and the scope of the present invention is not limited thereto, that is, the simple equivalent changes and modifications made by the patent application scope and the patent specification of the present invention are still It is within the scope of the patent of the present invention.

2‧‧‧Composite sheet

21‧‧‧ core layer

211‧‧‧ base segment

212‧‧‧ docking section

22‧‧‧ first surface

221‧‧‧first overlapping section

222‧‧‧First bonding section

23‧‧‧ second surface

231‧‧‧Second lap joint

232‧‧‧Second bonding section

24‧‧‧First paint finish

25‧‧‧Second paint layer

26‧‧‧Glued layer

Claims (9)

A method for bonding composite sheets, comprising: step A: preparing two composite sheets, each composite sheet comprising a core layer, and a first skin layer and a second skin layer on opposite surfaces of the core layer, the core layer In the case of a plastic material, the first skin layer and the second skin layer are a metal material, the core layer includes a base body segment, and a docking portion connecting one end of the base body segment, the first skin layer having a corresponding joint in the base body segment and a first overlapping section on an outer side of the docking section, and a first bonding section protruding from the side of the first overlapping section to the outside of the butting section, the second surface layer having a corresponding joint a second overlapping section on the other outer side of the base section, and a second bonding section at one end of the second overlapping section and correspondingly coupled to the docking section; Step B: in the first surface layer Forming a first baking varnish layer on the inner side surface of the first bonding section and the outer side surface of the second bonding section of the second skin layer, the first baking varnish layer comprising epoxy resin or polyurethane; in the first surface layer The outer side of the outer surface and the second stack of the second surface layer Forming a second baking layer on the outer side of the segment, the second baking layer on the second surface layer does not cover the first baking layer on the second bonding segment; and step C: combining the two composite layers Adjacent sides of the sheet are moved toward each other, and the first bonding section of each composite sheet is overlapped on the outside of the second bonding section of the adjacent composite sheet, and the first bonding sections are The second bonding section of the adjacent composite sheet is bonded and bonded through a bonding layer, and the first baking layer of each bonding layer is located on each first bonding section and adjacent Between the first lacquer layers on the second bonding section of the other composite sheet. The method of joining composite sheets according to claim 1, wherein in step B, before forming the second baking layer on the outer side surface of the first skin layer, forming a first surface on the outer side surface of the first skin layer a lacquer layer; the first lacquer layer on the second skin layer further extends over the outer side of the second splicing section; the second lacquer layer on the outer side of the second skin layer covers the second splicing section The first painted layer on the top. The method for bonding composite sheets according to claim 1, wherein in step C, before the adjacent composite sheets are overlapped, for each composite sheet, a piece of the adhesive film is first adhered to the inner side of the first bonding section. And one of the outer sides of the second bonding section, and then the adjacent composite sheets are overlapped, each adhesive film is respectively disposed between the first bonding section and the second bonding section of the other composite board Between the two, the glue film is further heated to be melted, and then cooled, and each glue film is separately hardened into the glue layer and the two composite sheets are bonded and bonded. The method of bonding composite sheets according to claim 3, wherein the heating temperature of the binder film is 150 ° C to 200 ° C, and the cooling temperature is 10 ° C to 80 ° C. The method for joining composite sheets according to claim 1, wherein the step C is before the overlapping of the adjacent composite sheets, and for each composite sheet, the inner side of the first bonding section and the second bonding section. At least one of the outer sides of the outer surface is coated with a viscous glue, and then the adjacent composite sheets are overlapped, the glue is respectively disposed between the first bonding section and the second composite of the other composite sheet Between the segments, after the glue is dried, Each of the composite sheets is bonded and bonded by hardening into the glue layer. The bonding method of the composite board according to claim 1, wherein in the step B, the first baking varnish layer is formed first, and then the second baking varnish layer is formed. The method of joining composite sheets according to claim 1, wherein in step B, the second baking varnish layer is formed first, and then the first baking varnish layer is formed. The method for bonding composite sheets according to claim 6 or 7, wherein the step of forming the first baking layer and the second baking layer comprises the following sub-steps: first coating a baking material, and then baking The paint material is dried and hardened. The method for bonding a composite board according to any one of claims 1 to 7, wherein the inner side of the first bonding section is firstly treated with chromate or phosphate before forming the first baking layer in step B. And the outer side of the second bonding section is surface treated.