Metal paste for 3D printing and preparation method of metal paste

The invention discloses metal paste for 3D printing and a preparation method of the metal paste. The metal paste is prepared from the following compositions in parts by weight: 40-100 parts of alloyedpowder, and 3-20 parts of fluxing paste. The alloyed powder is composed of one or more of Sn and Ag, Cu, Bi or Zn. The fluxing paste is prepared from the following compositions in percentage by weight: 35-50% of a solvent, 3-12% of an active agent, 2-11% of a thixotropic agent, and the balance of rosin. According to the metal paste, oxidation of the alloyed powder can be effectively overcome, preservation is easy, compared with traditional 3D printing materials that require the laser sintering process, waste can be reduced by 20% or above, and the efficiency is improved by 35% or above; and in addition, the price of 3D printing equipment required in the use process is reduced by 90% or above. 本发明公开了一种3D打印用的金属膏体，按重量份数计，包括以下组分：合金粉40-100份，助熔膏3-20份。所述合金粉由Sn与Ag、Cu、Bi或Zn中的至少一种组成。所述助熔膏，按重量百分数计，由以下组分组成：溶剂35-50％，活性剂3-12％，