Phosphate inorganic binding agent based on lactic acid and polylactic acid modification and preparing method of phosphate inorganic binding agent

Abstract

The invention discloses a phosphate inorganic binding agent based on lactic acid and polylactic acid modification and a preparing method of the phosphate inorganic binding agent. The neutralization of the phosphate inorganic binding agent ranges from 3.2 to 3.6, 4.0 g-10.0 g of a modifying agent of lactic acid or polylactic acid is added to 100 mL of the binding agent, 5 g-10.0 g of a curing agent of metal oxide is added in the sand mixing process, and the substance amount ratio of phosphoric acid to aluminum hydroxide is 3.2-3.6:1. According to the phosphate inorganic binding agent based on lactic acid and polylactic acid modification and the preparing method of the phosphate inorganic binding agent, stability and moisture absorption resistance of self-hardening sand and room-temperature comprehensive strength of the self-hardening sand are improved, detection is conducted in a detection center of a certain university, and the environment-friendly performance meets the requirement. Molding sand performance tests are carried out in a certain enterprise, and the results show that the requirement for industrial production is met; the problem of pollution of organic resin sand is solved through the phosphate binding agent, and moisture resisting performance, the comprehensive performance and the folding resisting strength of the sand are improved; and meanwhile, the composition is simple, the cost is low, the defects of the same kind of products are effectively overcome, and wide market prospects are achieved.

Description

technical field [0001] The invention belongs to the technical field of phosphate inorganic binders, and in particular relates to a phosphate inorganic binder modified based on lactic acid and polylactic acid and a preparation method thereof. Background technique [0002] At present, the molding materials on the market mainly use organic resins as sand binders, which release formaldehyde, ammonia, phenols, dioxins and other harmful substances during the production and casting process, which seriously pollute the environment and harm the workers in the production workshop. Physically harmful. Phosphate is used as a foundry binder and is made of inorganic materials. It is non-toxic, odorless, non-polluting to the environment, and has good thermal stability. The prepared mold (core) sand has good collapsibility and low gas generation. It has already aroused the interest of foundry workers. Compared with the currently used resin sand, phosphate foundry sand is easy to prepare, ...

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Problems solved by technology

[0004] The object of the present invention is to provide a kind of phosphate inorganic binder based on lactic acid and polylactic acid modification and preparation method thereof, aim to solve existing phosphate binder because of self poor stability causes crystallization precipitation (aging), Poor hygroscopicity leads to the problem that the strength of the sand mold or sand core is reduced due to moisture absorption during storage

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