Method for connecting two fiber-reinforced plastic components

Patent metadata

Field	Value
Publication number	US-10696872-B2
Application number	US-201615758945-A
Country	US
Kind code	B2
Filing date	Sep 7, 2016
Priority date	Sep 10, 2015
Publication date	Jun 30, 2020
Grant date	Jun 30, 2020

Abstract

The invention relates to an adhesive tape which can be used in particular in a method for connecting two fiber-reinforced plastic components, comprising a carrier material made of polyethylene, wherein a polyacrylate-based self-adhesive compound is applied to one side of the carrier material, said adhesive compound can be reduced to the following reactant mixture containing monomers having the following composition: A1) acrylic acid ester, and/or methacrylic acid ester of the following formula CH 2 ═CH(R 1 )(COOR 2 ), wherein R 1 =H or CH 3 and R 2 is an alkyl chain with 1 to 14 carbon atoms at a proportion of between 65 to 98 wt. %, A2) acrylates and/or methacrylates whose alcohol component contains at least one primary hydroxyl- or carboxyl-group, and/or with acrylate-copolymerizable vinyl compounds containing the at least one primary hydroxyl or carboxyl group at a proportion of between 1 to 20 wt. %, A3) multi-functional isocyanate cross-linker which blocks with thermally reversible protective groups at a proportion of between 1-10 wt. %, A4) and, if the proportions of A1), A2) and A3) do not add up to 100 wt. %, olefinically unsaturated monomers having functional groups, with a proportion of 0 to 15 wt. %.

First claim

The invention claimed is:

1. A method comprising:
providing a first fiber-reinforced plastic component comprising a first surface and further comprising a first laid scrim comprising a first fiber mat;
masking the first surface with a first adhesive tape;
providing a second fiber-reinforced plastic component comprising a second surface and further comprising a second laid scrim comprising a second fiber mat;
masking the second surface with a second adhesive tape;
contacting the first surface with the second surface;
introducing a mixture comprising a resin and a curing agent between the first surface and the second surface;
curing the mixture in the absence of air; and
removing the first adhesive tape and the second adhesive tape,

wherein the first adhesive tape comprises:
a first carrier film comprising a first carrier material comprising a first polyethylene and further comprising a first side; and
a first polyacrylate-based self-adhesive composition disposed on the first side,

and wherein the first polyacrylate-based self-adhesive composition is based on the following monomers:
A1) at least one of a first acrylic ester and a first methacrylic ester of the formula CH 2 ═C(R 1 )(COOR 2 ), where R 1 =H or CH 3 and R 2 is an alkyl chain having 1 to 14 carbon atoms, at a proportion between 55 to 98 wt % based on the total amount of monomers (A1)-(A4);
A2) at least one of a first acrylate, first methacrylate, and a first vinyl compound at a proportion between 1 to 20 wt % based on the total amount of monomers (A1)-(A4);
(A3) a first polyfunctional isocyanate crosslinker blocked with a first thermally-reversible protecting group, at a proportion of 1 to 10 wt % based on the total amount of monomers (A1)-(A4); and
A4) a first olefinically unsaturated monomer comprising a first functional group, at a proportion between 0 to 15 wt % based on the total amount of monomers (A1)-(A4);

and wherein:
the first acrylate or the first methacrylate comprises a first alcohol component comprising at least one first primary hydroxyl group or at least one first carboxyl group;
the first vinyl compound is copolymerizable with the first acrylate or the first methacrylate; and
the first vinyl compound comprises at least one second primary hydroxyl or at least one second carboxyl group;

wherein the second adhesive tape comprises:
a second carrier material comprising polyethylene and further comprising a second side; and
a second polyacrylate-based self-adhesive composition disposed on the second side,

and wherein the second polyacrylate-based self-adhesive composition is based on the following monomers:
A5) at least one of a second acrylic ester and a second methacrylic ester having the formula CH 2 ═C(R 1 )(COOR 2 ), where R 1 =H or CH 3 and R 2 is an alkyl chain having 1 to 14 carbon atoms, at a proportion between 55 to 98 wt % based on the total amount of monomers (A5)-(A8);
A6) at least one of a second acrylate, a second methacrylate, and a second vinyl compound at a proportion between 1 to 20 wt % based on the total amount of monomers (A5)-(A8);
A7) a second polyfunctional isocyanate crosslinker blocked with a second thermally-reversible protecting group, at a fraction of 1 to 10 wt % based on the total amount of monomers (A5)-(A8); and
A8) a second olefinically unsaturated monomer comprising a second functional group, at a proportion between 0 to 15 wt % based on the total amount of monomers (A5)-(A8);

and wherein:
the second acrylate or the second methacrylate comprises a second alcohol component comprising at least one third primary hydroxyl group or at least one third carboxyl group;
the second vinyl compound is copolymerizable with the second acrylate or the second methacrylate;
the second vinyl compound comprises at least one fourth primary hydroxyl or at least one fourth carboxyl group.

2. The method as claimed in claim 1 , wherein the first carrier film comprises at least one polyethylene polymer at a proportion of 90 wt % based on the first carrier film.

3. The method as claimed in claim 1 , wherein the first carrier film comprises at least one of a high-density polyethylene, a low-density polyethylene, and a linear low-density polyethylene.

4. The method as claimed in claim 3 , wherein the at least one of the high-density polyethylene, the low-density polyethylene, and the linear low-density polyethylene has a proportion of 99 wt % or more based on the first polyacrylate-based self-adhesive composition.

5. The method as claimed in claim 1 , wherein the first carrier film is in the form of a single film ply.

6. The method as claimed in claim 1 , wherein a thickness of the first carrier film is between 30 and 200 μm.

7. The method as claimed in claim 6 , wherein a thickness of the first carrier film is between 40 and 100 μm.

8. The method as claimed in claim 7 , wherein a thickness of the first carrier film is between 40 and 60 μm.

9. The method as claimed in claim 1 , wherein a coat weight of the first polyacrylate-based self-adhesive composition is between 10 and 50 g/m 2 .

10. The method as claimed in claim 9 , wherein a coat weight of the first polyacrylate-based self-adhesive composition is between 20 and 40 g/m 2 .

11. The method as claimed in claim 10 , wherein a coat weight of the first polyacrylate-based self-adhesive composition is between 25 and 35 g/m 2 .

12. The method as claimed in claim 1 , wherein the first carrier film comprises at least one polyethylene polymer at a proportion of 95 wt % based on the first polyacrylate-based self-adhesive composition.

13. The method according to claim 1 , wherein the composition of the first adhesive tape and the composition of the second adhesive tape are identical.

14. The method as claimed in claim 1 , wherein the polyethylene consists of at least one polyethylene polymer.

Assignees

• Tesa Se

Inventors

• Bernt Stephan
• Pütz Benjamin

Classifications

• C08F220/1808

  C8-(meth)acrylate, e.g. isooctyl (meth)acrylate or 2-ethylhexyl (meth)acrylate · CPC title

• C08F220/1804

  C4-(meth)acrylate, e.g. butyl (meth)acrylate, isobutyl (meth)acrylate or tert-butyl (meth)acrylate · CPC title

• B32B2262/106

  Carbon fibres, e.g. graphite fibres · CPC title

• B32B2260/023

  Two or more layers · CPC title

• B32B5/02

  characterised by structural features of a {fibrous or filamentary} layer {(layer formed of metallic wires B32B15/02; layer formed of natural mineral fibres B32B19/02; layer formed of wood fibres B32B21/02)} · CPC title