固化剂对磷酸盐胶黏剂气密性的影响

Influence of curing agent on airtightness of phosphate adhesive

以Al(H2PO4)3溶液为磷酸盐胶黏剂基体,研究了MgO、Al2O3、CuO三种固化剂对胶黏剂固化速率、固化温度、固化气密性的影响,分析了高温煅烧前后MgO和CuO对胶黏剂性能的影响.结果表明:MgO活性大,与Al(H2PO4)3基体反应迅速,不适合用作固化剂;以Al2O3为固化剂的胶黏剂密封性能差,Al2O3也不适合用作固化剂;未煅烧CuO作为磷酸盐胶黏剂的固化剂,反应速率适中且密封性能良好,当Al(H2PO4)3基体与CuO质量比为5.0∶4.5时,气密性最好,为0.15 MPa(非上限).

A1(H2P04)3 solution was used as the matrix of phosphate adhesive, the effects of curing agents (MgO, Al2〇3, and CuO) on the curing rate, curing temperature, and curing airtightness of adhesive were studied, and the influence of MgO and CuO before and after high temperature curing on the adhesive performance was also discussed. The results show that, MgO is not suitable as the curing agent due to the high activity, resulting in the rapid reaction with A1(H2P04)3 matrix;Al2〇3 is also not suitable used as the curing agent because of the low airtightness. Uncalcined CuO as curing agent shows the advantages of moderate reaction rate and good sealing performance. When the mass ratio of A1(H2P04)3 matrix to CuO is 5.0:4.5, the adhesive airtightness is 0.15 MPa (not upper limit).