US 12,290,993 B2
Composite pre-bonding treatment method
Hiromichi Akiyama, Tokyo (JP); and Kiyoka Takagi, Tokyo (JP)
Assigned to MITSUBISHI HEAVY INDUSTRIES, LTD., Tokyo (JP)
Appl. No. 17/627,394
Filed by MITSUBISHI HEAVY INDUSTRIES, LTD., Tokyo (JP)
PCT Filed Jun. 3, 2020, PCT No. PCT/JP2020/021956
§ 371(c)(1), (2) Date Jan. 14, 2022,
PCT Pub. No. WO2021/010044, PCT Pub. Date Jan. 21, 2021.
Claims priority of application No. 2019-131066 (JP), filed on Jul. 16, 2019.
Prior Publication US 2022/0258433 A1, Aug. 18, 2022
Int. Cl. B29C 65/00 (2006.01); B29C 65/48 (2006.01)
CPC B29C 66/0224 (2013.01) [B29C 65/48 (2013.01); B29C 66/0242 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A composite pre-bonding treatment method performed when bonding a composite material to a member, the composite pre-bonding treatment method comprising:
attaching an absorber adapted to absorb a contaminant to a surface of a prepreg laminate that is a precursor of the composite material;
covering the prepreg laminate with a packaging material from above the absorber;
vacuuming the packaging material and heating the prepreg laminate at a temperature lower than a curing temperature of a prepreg of the prepreg laminate and under a condition where a matrix resin of the prepreg is not gelled;
then removing the packaging material;
peeling off the absorber from the prepreg laminate with the matrix resin not gelled;
attaching, to a surface of the prepreg laminate with the absorber peeled off, a release member that does not transfer silicone or fluorine to a resin, and then completely curing the prepreg laminate to mold the composite material;
peeling off the release member from the composite material before bonding the member; and
after peeling off the release member and before bonding the member, applying hydrophilic treatment to a surface of the composite material on which the release member was attached,
wherein the release member is a non-transfer silicone film consisting of silicone having a molecular weight of 2000 or higher and/or a non-transfer fluorine film consisting of fluorine having a molecular weight of 2000 or higher.