Binder composition and method of forming foundry sand cores...

Details Binder composition and method of forming foundry sand cores... Binder composition and method of forming foundry sand cores...

B - Operations, Transporting

22

C

B22C 1/20 (2006.01)

Patent

CA 2662844

A cost-effective starch/water-based binder composition and related method for forming silica sand cores and molds for foundries, wherein the sand grains are pre-coated with starch having additives making the coated sand effective for blowing said cores and molds. One or more additives are included with the starch; preferably sodium tripolyphosphate and- silicon or Silres BS16. The preferred starch is a tapioca starch. The binder of the invention is highly competitive due to its low cost and effectiveness for forming silica-sand cores and molds, being particularly effective for use in aluminum foundries for the automotive industry.

La présente invention concerne une composition de liant économique à base d'amidon/d'eau et un procédé correspondant pour produire des noyaux en sable de silice et des moules destinés à des fonderies, les grains de sable étant préalablement enrobés d'amidon contenant des additifs qui permettent au sable enrobé d'être efficace pour le soufflage des noyaux et des moules. L'amidon peut contenir un ou plusieurs additifs, de préférence du tripolyphosphate de sodium et du silicium ou Silres BS16. L'amidon utilisé est de préférence du tapioca. Le liant selon cette invention est très compétitif en raison de son faible coût et de son efficacité pour produire des noyaux en sable de silice et des moules, lequel liant est particulièrement efficace lorsqu'il est utilisé dans des fonderies d'aluminium travaillant pour l'industrie automobile.

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