Adhesive composition
The present technology provides an adhesive composition containing a urethane prepolymer (UP), plural types of carbon blacks (CB), calcium carbonate, aliphatic isocyanate, a metal catalyst, and an amine catalyst, wherein first and second CBs have dibutyl phthalate oil absorptions of from 23 to 40 cm 3 /100 g and from 85 to 120 cm 3 /100 g, respectively; contents 1 and 2 of the first and second CBs are respectively not less than 25 parts by mass and not less than 9 parts by mass per 100 parts by mass of the UP; a content of the calcium carbonate is from 5 to 30 parts by mass per 100 parts by mass of the UP, and from 5 to 50 parts by mass per 100 parts by mass of a sum of the contents 1 and 2.
1. A one-part moisture curing-type adhesive composition comprising a urethane prepolymer, carbon black, calcium carbonate, aliphatic isocyanate, a metal catalyst, and an amine catalyst,
wherein the carbon black comprises plural types of carbon blacks;
a first carbon black has a dibutyl phthalate oil absorption of from 23 to 40 cm 3 /100 g;
a second carbon black has a dibutyl phthalate oil absorption of from 85 to 120 cm 3 /100 g;
a content 1 of the first carbon black is not less than 25 parts by mass per 100 parts by mass of the urethane prepolymer;
a content 2 of the second carbon black is not less than 9 parts by mass per 100 parts by mass of the urethane prepolymer;
a content of the calcium carbonate is from 5 to 30 parts by mass per 100 parts by mass of the urethane prepolymer; and
a content of the calcium carbonate is from 5 to 50 parts by mass per 100 parts by mass of a sum of the content 1 and the content 2.
2. The adhesive composition according to claim 1 , wherein the content 1 is not greater than 140 parts by mass per 100 parts by mass of the urethane prepolymer.
3. The adhesive composition according to claim 1 , wherein the content 2 is not greater than 45 parts by mass per 100 parts by mass of the urethane prepolymer.
4. The adhesive composition according to claim 1 , wherein the aliphatic isocyanate is a trifunctional compound A that is modified from hexamethylene diisocyanate.
5. The adhesive composition according to claim 1 , wherein the content of the aliphatic isocyanate is from 4 to 14 parts by mass per 100 parts by mass of the urethane prepolymer.
6. The adhesive composition according to claim 1 , wherein the metal catalyst comprises an organotin catalyst.
7. The adhesive composition according to claim 1 , wherein the content of the metal catalyst is from 0.0004 to 0.03 parts by mass per 100 parts by mass of the urethane prepolymer.
8. The adhesive composition according to claim 1 , wherein the amine catalyst has a dimorpholinodiethylether structure.
9. The adhesive composition according to claim 1 , wherein the content of the amine catalyst is from 0.02 to 0.4 parts by mass per 100 parts by mass of the urethane prepolymer.
10. The adhesive composition according to claim 1 further comprising a third carbon black, wherein a value of k×w is not greater than 650, where k is a dibutyl phthalate oil absorption of the third carbon black in cm 3 /100 g, and w is a content of the third carbon black in parts by mass per 100 parts by mass of the urethane prepolymer.
11. The adhesive composition according to claim 1 , wherein the content 1 and the content 2 satisfy the following relationships (a) to (d), or relationships (e) to (h):
11×content 1+20×content 2≥1080; Relationship (a)
2×content 1+55×content 2≥710; Relationship (b)
1×content 1+35×content 2≤1165; Relationship (c)
21×content 1+19×content 2≤2985; Relationship (d)
59×content 2<−4×content 1+2694; Relationship (e)
2×content 2<−11×content 1+1004; Relationship (f)
16×content 2>−1×content 1+376; and Relationship (g)
15×content 2>−23×content 1+1235. Relationship (h)
12. The adhesive composition according to claim 1 ,
wherein the dibutyl phthalate oil absorption of the first carbon black is from 23 to 33 cm 3 /100 g;
the dibutyl phthalate oil absorption of the second carbon black is from 95 to 120 cm 3 /100 g; and
the content 1 and the content 2 satisfy the following relationships (a) to (d):
11×content 1+20×content 2≥1080; Relationship (a)
2×content 1+55×content 2≥710; Relationship (b)
1×content 1+35×content 2≤1165; and Relationship (c)
21×content 1+19×content 2≤2985. Relationship (d)
13. The adhesive composition according to claim 1 ,
wherein the dibutyl phthalate oil absorption of the first carbon black is from 28 to 40 cm 3 /100 g;
the dibutyl phthalate oil absorption of the second carbon black is from 85 to 115 cm 3 /100 g; and
the content 1 and the content 2 satisfy the following relationships (e) to (h):
59×content 2<−4×content 1+2694; Relationship (e)
2×content 2<−11×content 1+1004; Relationship (f)
16×content 2>−1×content 1+376; and Relationship (g)
15×content 2>−23×content 1+1235. Relationship (h)