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US 12,509,561 B2Granted
Epoxy resin composition for use as structural adhesive
AssigneeBASF SE
InventorsChristoph Martin Hanske, Matthaeus Kopczynski, Marion da Silva, Indre Thiel
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Abstract
A method prepares a curable composition based on ground composite material from the recycling of discarded composite elements such as old pipes or rotor blades of wind power plants. The ground composite material allows for the replacement of virgin short glass fibers and fumed silica commonly employed in such compositions used as structural adhesives essentially without any negative impact on the performance.
Claims11
A method for adhering at least two substrates, comprising:
- (i) applying a curable composition obtained by
- (a) providing at least one ground composite material prepared by grinding a composite comprising a polymer matrix and glass fibers,
- (b) combining and mixing the at least one ground composite material of (a) with an epoxy resin component or a hardener component comprising at least one amino curing agent or both,
- (c) mixing of the epoxy resin component and the hardener component resulting from (b), at least one of which comprises the at least one ground composite material,
- wherein a polymer matrix of the at least one ground composite material comprises a cured unsaturated polyester resin, and
- a particle size of at least 75% b.w. of a total ground composite material is in a range of from 32 μm to 300 μm as determined by sieving in accordance with the standard DIN 66165 (2016) using woven wire sieve,
- to at least one of the substrates, resulting in substrates which are at least partially coated with the curable composition,
- (ii) bringing into contact the at least two substrates at least one of which is coated with the curable composition,
- (iii) allowing the curing of the curable composition.
6 more elements
Dependencies are inferred from the claim text.