Thermal cracking resistant hard sand

Abstract

The invention discloses thermal cracking resistant hard sand, which comprises raw sand, adhesive, curing agent, coupling agent and lubricating agent, wherein the using amount of the curing agent is 30 to 50 percent based on the using amount of the adhesive, the using amount of the coupling agent is 0.2 to 0.4 percent based on the using amount of the adhesive, the using amount of the adhesive is 2 to 5 percent based on the using amount of the raw sand, and the using amount of the lubricating agent is 1 to 3 percent based on the using amount of the raw sand; the adhesive consists of the following components in part by weight: 60 to 70 parts of furan resin, 20 to 30 parts of phenolic resin and 5 to 15 parts of tricresyl phosphate; and the raw sand comprises return sand, quartz sand, silica sand and ferric oxide powder. The thermal cracking resistant hard sand has the advantages of low brittleness, cracking resistance and low cost.

Description

Technical field [0001] The invention relates to a self-setting sand, in particular to a self-setting sand with resistance to thermal cracking, and is particularly suitable for furan self-setting sand used in large-scale sand casting. Background technique [0002] Resin self-hardening sand is generally prepared by mixing silica sand, resin and hardener. Commonly used resins are furan resin, resole resin and urethane resin. The sand mold made of this kind of sand has high strength, accurate size, good collapsibility and low energy consumption. It can be used for the production of cast steel, cast iron and cast non-ferrous alloy castings with high surface quality and dimensional accuracy. Resin self-setting sand is a kind of modeling sand with great development prospects. [0003] The Chinese Patent Authorization Announcement Number is CN1216703C. The invention patent with the authorization announcement date on August 31, 2005 discloses a self-setting sand belonging to the foundry i...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the defects and problems existing in the prior art that are relatively brittle and prone to cracking during use, and to provide a thermal cracking-resistant self-setting sand that is less brittle and less prone to cracking during use.