Study on catalytic curing of benzoxazine-based organosilicone adhesive
As a thermosetting resin with excellent performance,benzoxazine has been widely used in aerospace,electronics and electrical fields.However,it also shows the disadvantages of high curing temperature,poor processability,and high brittleness.Organosilicone compounds have attracted the attention of researchers because of their excellent toughness and low surface tension,which make them easier to spread on the material due to their low surface tension.Based on this,the benzoxazine-based organosilicone adhesive was studied in this paper.By using different proportions of organic acids(such as p-toluenesulfonic acid,glacial acetic acid,phosphoric acid)or organic bases(such as aniline,ethanolamine,2-methyl-1,5-pentanediamine)for catalysis,the bonding strength of the adhesive on iron sheet or special plate under different catalytic conditions was compared.The research results showed that,when p-toluenesulfonic acid or phosphoric acid was used to catalyze the bonding of iron sheet,better catalytic effects were achieved at 120℃or 100℃curing processes than the original body,with values of 4.68 and 4.32 MPa,respectively.When organic base catalysts were used to catalyze the bonding of iron sheet or special plate,2-methyl-1,5-pentanediamine had been proven to be the optimal catalyst.When the mass ratio of m(2-methyl-1,5-pentanediamine)∶m(adhesive)was 1∶9 or 1∶18,respectively,better bonding effects were achieved on iron sheet or special plate,which confirmed that this catalyst had excellent catalytic effect.The use of 2-methyl-1,5-pentanediamine could effectively reduce the ring opening curing temperature and improved the bonding strength(reaching 9.92 MPa at 120℃),which provided an effective approach for achieving low-temperature curing of benzoxazine-based organosilicone adhesive.
万方数据
维普
