Bonded Article and Method for Producing Same
The present technology provides a bonded article, comprising: a first member containing plastic and including a portion that has been flame-treated under a condition A1 shown below; a second member; and an adhesive that bonds the first member and the second member to each other, wherein the first member adheres with the adhesive at the flame-treated portion, and a primer is not interposed between the first member and the adhesive: (Condition A1) a volume ratio R A1 of air and combustion gas used for generation of flame in the flame treatment, and a volume ratio R P of air and combustion gas when the combustion gas is completely combusted satisfy the following formula (1): 0.8≤volume ratio R A1 /volume ratio R P ≤1 (1).
1 . A bonded article, comprising:
a first member containing plastic and including a portion that has been flame-treated under a condition A1 shown below; a second member; and an adhesive that bonds the first member and the second member to each other,
wherein the first member adheres with the adhesive at the flame-treated portion, and
a primer is not interposed between the first member and the adhesive:
(Condition A1) a volume ratio R A1 of air and combustion gas used for generation of flame in the flame treatment, and a volume ratio R P of air and combustion gas when the combustion gas is completely combusted satisfy the following formula (1):
0.8≤volume ratio R A1 /volume ratio R P ≤1 (1).
2 . The bonded article according to claim 1 , wherein the first member contains a polyolefin-based resin as the plastic and an inorganic substance.
3 . The bonded article according to claim 1 , wherein the adhesive is a urethane-based adhesive, an epoxy-based adhesive, a modified silicone-based adhesive, or an acryl-based adhesive.
4 . The bonded article according to claim 1 , wherein
the second member contains plastic, includes a portion that has been flame-treated under a condition A2 shown below, and adheres with the adhesive at the flame-treated portion:
(Condition A2) a volume ratio R A2 of air and combustion gas used for generation of flame in the flame treatment, and a volume ratio R P of air and combustion gas when the combustion gas is completely combusted satisfy the following formula (2):
0.8≤volume ratio R A2 /volume ratio R P ≤1 (2).
5 . The bonded article according to claim 1 , wherein the combustion gas contains propane gas or natural gas.
6 . A method for producing a bonded article, the method comprising:
a surface treatment step of flame-treating a first member containing plastic under a condition A1 shown below;
an adhesive application step of applying an adhesive to the flame-treated first member without a primer interposed therebetween; and
a bonding step of laminating the second member on the adhesive and bonding the first member, the adhesive, and the second member:
(Condition A1) a volume ratio R A1 of air and combustion gas used for the generation of flame in the flame treatment, and a volume ratio R P of air and combustion gas when the combustion gas is completely combusted satisfy the following formula (1):
0.8≤volume ratio R A1 /volume ratio R P ≤1 (1).
7 . The method for producing a bonded article according to claim 6 , wherein
the second member contains plastic,
the method further comprising another surface treatment step of flame-treating the second member under a condition A2 shown below, the another surface treatment step being performed in advance before the bonding step,
wherein, in the bonding step, the flame-treated second member is laminated on the adhesive:
(Condition A2) a volume ratio R A2 of air and combustion gas used for generation of flame in the flame treatment, and a volume ratio R P of air and combustion gas when the combustion gas is completely combusted satisfy the following formula (2):
0.8≤volume ratio R A2 /volume ratio R P ≤1 (2).