Method for Joining Two Fibre-Reinforced Plastic Components

Abstract

The invention relates to a method for connecting two fibre-reinforced plastic components, comprising the following steps: producing a first fibre-reinforced plastic component, wherein a fabric made of fibrous matting is provided, which is impregnated with a resin-curing agent mixture, which is then subsequently cured, wherein the part of the surface of the first fibre-reinforced plastic component, which is to be later adhered to the second fibre-reinforced plastic component (hereinafter also referred to as joining surface), is masked with an adhesive strip before the impregnation of the fibrous matting with the resin-curing agent mixture; producing a second fibre-reinforced plastic component using the above steps, wherein the part of the surface of the second fibre-reinforced plastic component, which is to be later adhered to the first fibre-reinforced plastic component, is also masked with an adhesive strip before the impregnation of the fibrous matting with the resin-curing agent mixture; removing the adhesive strips from the two finished fibre-reinforced plastic components; bringing the two joining surfaces in contact; introducing a resin-curing agent mixture between the two joining surfaces; curing the resin-curing agent mixture, wherein the adhesive strip has a carrier film, on one side of which an adhesive mass, in particular self-adhesive mass is applied, and wherein the carrier film consists of fluoropolymers, polyethylene polymers, undrawn polypropylenes or of metal, and the adhesive mass is an acrylate or silicon adhesive mass.

Claims

1. A method for joining two fiber-reinforced plastic components, comprising the following steps: producing a first fiber-reinforced plastic component by introducing a laid scrim of fiber mats which is impregnated with a resin/curing agent mixture, which in turn is subsequently cured; that part of the surface of the first fiber-reinforced plastic component which is later to be bonded to the second fiber-reinforced plastic component (also called joining surface below) is masked with an adhesive tape before the fiber mats are impregnated with the resin/curing agent mixture, producing a second fiber-reinforced plastic component according to the steps specified above; that part of the surface of the second fiber-reinforced plastic component that is later to be bonded to the first fiber-reinforced plastic component is likewise masked with an adhesive tape before the fiber mats are impregnated with the resin/curing agent mixture, removing the adhesive tapes from the two completed fiber-reinforced plastic components, contacting the two joining surfaces, introducing a resin/curing agent mixture between the two joining surfaces, curing the resin/curing agent mixture, wherein the adhesive tape has a carrier film which bears on one side an applied adhesive composition, and wherein the carrier film consists of fluoropolymers, of polyethylene polymers, of unoriented polypropylene or of metal, and the adhesive composition is an acrylate or silicone adhesive composition.

2. The method as claimed in claim 1, wherein the carrier film comprises to an extent of 90 wt %, one or at least two fluoropolymers (based in each case on the total composition of the carrier film), or the polymers forming the carrier film consist to an extent of 100 wt % of one or at least two fluoropolymers.

3. The method as claimed in claim 1, wherein fluoropolymers used for the carrier film are PTFE (polytetrafluoroethylene), PFA (perfluoroalkoxy polymers) or FEP (poly(tetrafluoroethylene-co-hexafluoropropylene)), or mixtures of two or more of said fluoropolymers.

4. The method as claimed in claim 1, wherein polyethylene is used for the carrier film.

5. The method as claimed in claim 1, wherein the carrier film comprises unoriented polypropylene or consists of unoriented polypropylene.

6. The method as claimed in claim 1, wherein the carrier film consists of a single film ply.

7. The method as claimed in claim 1, wherein the thickness of the carrier film is between 30 and 200 m.

8. The method as claimed in claim 1, wherein the adhesive composition applied on the carrier film is an acrylate-based or silicone-based pressure-sensitive adhesive composition.

9. The method as claimed in claim 1, wherein for the acrylate-based adhesive composition, a polyacrylate is used which can be traced back to the following reactant mixture, comprising monomers of the following composition: A1) acrylic esters and/or methacrylic esters of the following formula
CH.sub.2CH(R.sup.1)(COOR.sup.2) where R.sup.1=H or CH.sub.3 and R.sup.2 is an alkyl chain having 1 to 14 carbon atoms, with a fraction of 55 to 98 wt %, A2) acrylates and/or methacrylates whose alcohol component contains at least one primary hydroxyl or carboxyl group, and/or vinyl compounds which are copolymerizable with acrylates and which contain at least one primary hydroxyl or carboxyl group, with a fraction of 1 to 20 wt %, A3) polyfunctional isocyanate crosslinkers which are blocked with thermally reversible protecting groups, with a fraction of 1 to 10 wt %, A4) and, if the fractions of A1), A2) and A3) do not add up to 100 wt %, olefinically unsaturated monomers having functional groups, with a fraction of 0 to 15 wt %.

10. The method as claimed in at claim 1, wherein for the acrylate-based adhesive composition, a polyacrylate is used which can be traced back to the following reactant mixture, comprising monomers of the following composition: A1) acrylic esters and/or methacrylic esters of the following formula
CH.sub.2CH(R.sup.1)(COOR.sup.2) where R.sup.1=H or CH.sub.3 and R.sup.2 is an alkyl chain having 1 to 14 carbon atoms, with a fraction of 75 to 98 wt %, A2) acrylates and/or methacrylates whose alcohol component contains at least one primary hydroxyl or carboxyl group, and/or vinyl compounds which are copolymerizable with acrylates and which contain at least one primary hydroxyl or carboxyl group, with a fraction of 1 to 5 wt %, A3) acrylates and/or methacrylates whose alcohol component contains at least one epoxy group, and/or vinyl compounds which are copolymerizable with acrylates and which contain at least one epoxy group, with a fraction of 1 to 5 wt %, A4) and, if the fractions of A1), A2) and A3) do not add up to 100 wt %, olefinically unsaturated monomers having functional groups, with a fraction of 0 to 15 wt %.

11. The method as claimed in claim 1, wherein for the acrylate-based adhesive composition, a polyacrylate is used which can be traced back to the following reactant mixture, comprising monomers of the following composition: A1) acrylic esters and/or methacrylic esters of the following formula
CH.sub.2CH(R.sup.1)(COOR.sup.2) where R.sup.1=H or CH.sub.3 and R.sup.2 is an alkyl radical having 1 to 14 carbon atoms, with a fraction of 50 to 95 wt %, A2) acrylates and/or methacrylates whose alcohol component contains at least one primary hydroxyl or carboxyl group, and/or vinyl compounds which are copolymerizable with acrylates and which contain at least one primary hydroxyl or carboxyl group, with a fraction of 5 to 30 wt %, A3) acrylates and/or methacrylates whose alcohol component contains at least one epoxy group, and/or vinyl compounds which are copolymerizable with acrylates and which contain at least one epoxy group, with a fraction of 0 to 5 wt %, A4) and, if the fractions of A1), A2) and A3) do not add up to 100 wt %, olefinically unsaturated monomers having functional groups, with a fraction of 0 to 15 wt %.

12. The method as claimed in claim 1, wherein the coat weight of the adhesive composition on the carrier film is between 10 and 50 g/m.sup.2.

13. The method of claim 1, wherein the adhesive tape has a carrier film which bears on one side an applied adhesive composition which is a self-adhesive composition.

14. The method of claim 2, wherein the carrier film comprises to an extent of 95 wt % one or at least two fluoropolymers (based in each case on the total composition of the carrier film).

15. The method of claim 4, wherein HDPE, LDPE and/or LLDPE are used for the carrier film.

16. The method of claim 7, wherein the thickness of the carrier film is between 40 and 100 m.

17. The method of claim 16, wherein the thickness of the carrier film is between 40 and 60 m.

18. The method of claim 12, wherein the coat weight of the adhesive composition on the carrier film is between 20 and 40 g/m.sup.2.

19. The method of claim 18, wherein the coat weight of the adhesive composition on the carrier film is between 25 and 35 g/m.sup.2.

Description

[0178] Elucidated in more detail below is an adhesive tape by reference to a FIGURE, without wishing thereby to cause any restriction of whatever kind.

[0179] FIG. 1 shows the adhesive tape in a lateral section.

[0180] FIG. 1 shows in a section in the transverse direction (cross section) the adhesive tape consisting of a film carrier 1, bearing on one side an applied layer of a self-adhesive coating 2.