Resin sand for sand casting and preparation method of resin sand

[0028] Example

[0029] A resin sand for sand casting, comprising 100 parts of sandstone, 1-1.2 parts of furan resin, 0.3-0.5 part of acid curing agent, 0.3-0.4 part of silane coupling agent, and 0.3-0.4 part of desiccant;

[0030] The sandstone is composed of natural quartz sand and regenerated sand, of which 60 parts of natural quartz sand and 40 parts of regenerated sand.

[0031] The mesh of sand and gravel is 40-70 mesh.

[0032] The furan resin is one of urea formaldehyde furfuryl alcohol resin, phenolic furfuryl alcohol resin, phenol urea formaldehyde furfuryl alcohol resin or formaldehyde furfuryl alcohol resin or a combination thereof;

[0033] The acid curing agent is one or a combination of benzenesulfonic acid, xylenesulfonic acid, phosphoric acid or ethyl sulfate.

[0034] A preparation method of resin sand for sand casting, comprising the following steps:

[0035] (1) Preparation of raw materials: 60 parts of natural quartz sand, 40 parts of regenerated sand, 1-1