| 摘要 |
<p>PURPOSE:To form high quality molds easily by a method wherein an isocyanate compound is mixed into polyhydoxybutadiene polymer with hydrogen additive at a specified ratio to form a split type mold for a rectifier as a thermosetting elastic body, and each mold is then solidified together. CONSTITUTION:Thermosetting molding material 30 is adquately vacuum-defoamed in a vacuum stirrer 21 at a temperature of its melting point or above, and then poured into a metallic pattern for preforming 22. Now, an upper half and a lower half molds of thermosetting molding material can be obtained after cooled down to room temperature and removed from the metallic pattern. In this process, 0.8-1.2mol of the isocyanate compound represented by the formula 1 as general formula is mixed as a ahardeneing agent to 1 mole of polyhydoxybutadiene polymer with hydrogen additive as thermosetting elastic substance. Moreover, mateials of fixed shape 30a, 30a are inserted as elastic molding material in an upper metal pattern 23a and a lower metal pattern 23b for molding respectively and a current transformer proper 1 is put inside one of the molds 30a. The patterns are then clamped together to melt the molding materials 30a, 30a together for unification.</p> |
