As a thermosetting resin with excellent properties, benzoxazine has been widely used in aerospace, electronics and other fields, but it also has some shortcomings such as high curing temperature, poor machinability and great brittleness. Silicone compounds have attracted the attention of researchers because of their excellent toughness and low surface tension, which makes them easier to spread on the material.

The researchers found that when the p-toluene sulfonic acid or phosphoric acid catalyzed the bonding of the iron sheet, the catalytic effect was better than that of the bulk at 120 ℃ or 100 ℃ curing process, respectively, 4.68 and 4.32 MPa. When organic base catalysts catalyzed the bonding of solidified iron or special plates, 2-methyl-1, 5-pentenediamine was proved to be the best catalyst. When the mass ratio of m (2-methyl-1, 5-pentenediamine) to m (binder) was 1:9 or 1:18, the better bonding effect was achieved on the iron sheet or the special plate, which confirmed that the catalyst had a better catalytic effect. The use of 2-methyl-1, 5-pentenediamine can effectively reduce the open-loop curing temperature and increase the bonding strength (9.92 MPa at 120 ℃), which provides an effective way to realize the low temperature curing of benzoxazinyl silicone adhesives.

Study on catalytic curing of benzoxazinyl silicone adhesive