摘要 |
PURPOSE:To improve the characteristics required for a binder by combining prescribed wt% of an org. gelling agent with specific % of acrylic resin and xylene. CONSTITUTION:The compsn. consisting of 20-50wt% acrylic resin powder, 0.2- 1% org. gelling agent and the balance xylene is mixed and agitated then the mixture is heated in a hot bath for about 1hr at 80 deg.C and is then allowed to cool in the atm. down to an ordinary temp. If the paste solder is manufactured by mixing and agitating adequately the binder for paste solder obtd. by the above-mentioned method and solder powder, the sepn. or corrosion of the solder powder during storage is obviated and the oxidation of the base metal to be brazed is obviated as well. No spatters and residues are produced during brazing and therefore the characteristics required for the binder are improved. |