(METH)ACRYLATE-BASED TWO-COMPONENT ADHESIVE FORMULATION FOR ASSEMBLING WIND TURBINE BLADES
The invention relates to a two-component adhesive formulation comprising: a composition (A) comprising: from 70% to 99.98% by weight of a liquid (meth)acrylic syrup comprising: a) a (meth)acrylic polymer, b) a (meth)acrylic monomer, said liquid (meth)acrylic syrup having a dynamic viscosity ranging from 10 mPa*s to 10 000 mPa*s; from 0.01% to 12% by weight of at least one urethane-methacrylate oligomer having a functionality of greater than or equal to 2, at least one activator, a composition (B) comprising a radical initiator, said initiator forming, on contact with said activator, a system that is able to initiate the polymerization of the (meth)acrylic monomer of composition (A).
1 - 15 . (canceled)
16 . A two-component adhesive formulation comprising:
a composition (A) comprising:
from 70% to 99.98% by weight of a liquid (meth)acrylic syrup comprising:
a) a (meth)acrylic polymer, and
b) a (meth)acrylic monomer,
said liquid (meth)acrylic syrup having a dynamic viscosity ranging from 10 mPa*s to 10 000 mPa*s;
from 0.01% to 12% by weight of at least one urethane-(meth)acrylate oligomer having a functionality of greater than or equal to 2, and
at least one activator,
a composition (B) comprising a radical initiator,
said initiator forming, on contact with said activator, a system that is able to initiate the polymerization of the (meth)acrylic monomer of composition (A).
17 . The formulation as claimed in claim 16 , wherein the (meth)acrylic polymer is a methyl methacrylate (MMA) copolymer comprising at least 70%, by weight of methyl methacrylate (MMA).
18 . The formulation as claimed in claim 16 , wherein the (meth)acrylic polymer comprises a comonomer, said comonomer being an alkyl acrylate, the alkyl group having from 1 to 12 carbon atoms.
19 . The formulation as claimed in claim 16 , wherein the (meth)acrylic polymer is a copolymer of methyl methacrylate and ethyl acrylate (MMA/EA).
20 . The formulation as claimed in claim 16 , wherein the liquid syrup comprises from 40% to 90% by weight, of (meth)acrylic monomer relative to the total weight of the liquid (meth)acrylic syrup.
21 . The formulation as claimed in claim 16 , wherein the urethane-(meth)acrylate oligomer has a glass transition temperature Tg of between 10° and 150° C.
22 . The formulation as claimed in claim 16 , wherein the urethane-(meth)acrylate oligomer has a molar mass of less than 1500 g·mol −1 .
23 . The formulation as claimed in claim 16 , wherein the composition (A) comprises from 0.01% to 10% by weight, of urethane-(meth)acrylate oligomer relative to the total weight of composition (A).
24 . The formulation as claimed in claim 16 , wherein the composition (A) comprises from 0% to 40% by total weight of additive(s) relative to the total weight of said composition (A).
25 . The formulation as claimed in claim 16 , wherein the composition (A) comprises, relative to the total weight of composition (A):
from 70% to 95% by weight of liquid (meth)acrylic syrup;
from 0.1% to 7% by weight of urethane-(meth)acrylate oligomer(s);
from 0.1% to 5% by weight of activator(s); and
from 0% to 30% by weight of additive(s).
26 . The formulation as claimed in claim 16 , wherein the composition (B) comprises, relative to the total weight of composition B:
from 5% to 40% by weight of initiator; and
from 60% to 95% by weight of additives.
27 . A process for preparing an article comprising at least two assembled substrates, said process comprising:
i. mixing compositions (A) and (B) of the adhesive formulation as claimed in claim 16 ;
ii. applying the mixed adhesive formulation obtained in this way between a first and a second substrate;
iii. polymerizing the mixed adhesive formulation between the first and the second substrate, by means of which the two substrates are assembled.
28 . An article capable of being obtained according to the process of claim 27 .
29 . A wind turbine blade comprising a two-component adhesive formulation as claimed in claim 16 , polymerized by mixing compositions (A) and (B), said polymerized two-component formulation being simultaneously in contact with a first substrate and a second substrate of a wind turbine blade.
30 . The formulation as claimed in claim 25 , wherein the composition (A) comprises, relative to the total weight of composition (A):
from 70% to 95% by weight of liquid (meth)acrylic syrup;
from 0.1% to 5% by weight of urethane-(meth)acrylate oligomer(s);
from 0.1% to 5% by weight of activator(s);
from 0.1% to 10% by weight of film-forming agent(s); and
from 0.1% to 10% by weight of impact modifier(s).
31 . The formulation as claimed in claim 26 , wherein the composition (B) comprises, relative to the total weight of composition B:
from 5% to 40% by weight of initiator;
from 40% to 75% by weight of additives selected from non-reactive diluents, plasticizers and mixtures thereof; and
from 0% to 25% by weight of other additive(s).