Alkaline phenolic resin self-hardening sand

Abstract

The invention discloses alkaline phenolic resin self-hardening sand, which comprises crude sand, an adhesive, a curing agent, a coupling agent and a lubricant, wherein the using amount of the curing agent is 30 to 50 percent based on that of the adhesive; the using amount of the coupling agent is 1 to 5 percent based on that of the adhesive; the using amount of the adhesive is 3 to 5 percent based on that of the crude sand; the using amount of the lubricant is 1 to 3 percent based on that of the crude sand; the coupling agent comprises the following components in percentage by weight: 80 to 90 percent of silane coupling agent and 10 to 20 percent of celluosic resin; the adhesive comprises the following components in percentage by weight: 60 to 70 percent of phenolic resin, 20 to 40 percent of alkaline solution and the balance of water; the solute of the alkaline solution is potassium hydroxide, sodium hydroxide or a mixture thereof; and the mass percentage concentration of the alkaline solution is more than or equal to 30 percent. The alkaline phenolic resin self-hardening sand has relatively lower hardening speed, is difficult to influence by an acid environment and can ensure the quality of iron and steel castings.

Description

technical field [0001] The invention relates to a self-setting sand, in particular to an alkaline phenolic resin self-setting sand, which is particularly suitable for a self-setting sand cold box used in large castings. Background technique [0002] Resin self-bake sand is generally prepared by mixing silica sand, resin and hardener. Commonly used resins are furan resin, resole phenolic resin and urethane resin. The sand mold made of this kind of molding sand has high strength, accurate size, good collapsibility and low energy consumption. It can be used in the production of cast steel, cast iron and non-ferrous alloy castings. The surface quality and dimensional accuracy of the castings are high. Resin self-setting sand is a promising molding sand. [0003] The Chinese patent authorization announcement number is CN1216703C, and the invention patent issued on August 31, 2005 discloses a self-setting sand belonging to the foundry industry. It is an environmentally friendly ...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the defects and problems in the prior art that the hardening speed is fast and easily affected by acids, and to provide an alkaline phenolic resin no-bake sand with a slow hardening speed and not affected by acids.