How to reproduce the polyurethane resin without vacuum machine
People always knows that the silicone mould will have lots of bubbles with no vacuum machine available, and the question is what we can do to reduce air rubble under the circumstance of no vacuum machine can be used, this operation shows the process of how to reproduce the polyurethane resin.
1.First take a look at the renderings
2.Though it exist a small amount of bubbles, it is acceptable because there is no vacuum machine to make this and repair it seems not difficult.
3.Here begin, put a layer of blue clay beneath to prevent the liquid silicone form outflow, circle it with a smooth cardboard.
4.Before pouring, remember to brush a layer of silicone rubber onto the surface of molds with writing brush , which can effectively reduce air bubbles.
5.Start pouring after brush the rubber, try to pour the silicone in the shape like filaments until Covers the entire master mold above 2 ~ 3 cm. if bubbles exist, poke it with toothpick.
6.Put the poured silicone into oven to speed up curing.
7.After curing, cut it into apart carefully and cut out the Water injection and the outlet with hobby knife, the silicone mold is completed.
8.After finishing the silicone mold, start to mix polyurethane resin.
9.Drop a black paste in liquid A.
11.Put the two-side mold together, remember to tighten them or the polyurethane resin will be leaked, then pouring the polyurethane resin in, you may shake it to remove bubbles.
12.After 15 minutes curing, molds can be taken out.
13.Finished and see results.