The composition of a binder of the particles of sand casting, of a sand coated with resin and sand obtained in order to form the moulds and cores for molding sand

摘要

The present invention relates to a composition of a binder of the particles of sand casting. / p & & p & according to the invention, the composition contains a crystalline polyester and unsaturated as main component and a monomer of diallyl phthalate, the ratio ponderal of diallyl phthalate to the polyester unsaturated because of the order of 5: 100 to 30: 100, the composition being a solid has a slightly sticky to the ambient temperature, its viscosity at a temperature of the order of 30c to the - above its softening point, since the lower is approximately 500 poises, the attached drawing shows the relationship between the quantity of diallyl dephtalate and the time of the mixture to the to prepare a sand coated with resin according to the invention. / p & & p & the invention applies in particular to the formation of moulds and cores to be used in the by molding or sand coulee.