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本文重点阐述了以硅砂为原砂,MDT有机酯系列作硬化剂的水玻璃自硬砂合适的水玻璃加入量,各有机酯品种及其不同加入量对型砂性能的关系,环境温度对型砂自硬速度的影响,型砂可使用时间和可脱模时间,自硬后的存放性,以及残留强度等试验结果。并介绍了用锆砂和铬铁矿砂等特种砂配制酯硬化水玻璃砂时的基本配方及性能。最后介绍了酯硬化水玻璃砂的生产应用实例及其效果。推荐的酯硬化水玻层砂的基本配方是:a.硅砂100,水玻璃2.8～4.5,MDT有机酯占水玻璃的8～12％;b.锆砂100,水玻璃1.5,MDT有机酯0.5～0.20;c.铬铁矿砂100,水玻璃1.6～1.8,MDT有机酯0.16～0.22。
This article focuses on the appropriate amount of sodium silicate added into the water glass self-hardening sand with silica sand as the original sand and MDT organic ester series hardener, the relationship between the various organic ester varieties and their added amount on the sand performance, The influence of the hard speed, the time of using the sand and the releasable time, the storage property after self-hardening, and the test result of the residual strength and the like. The basic formulation and properties of esterified sodium silicate sand with special sand such as zircon sand and chromite sand are also introduced. Finally, the production and application of esterified sodium silicate sand and its effects are introduced. The recommended formula for the esterified hydrosphere sand is: a. Silica sand 100, water glass 2.8-4.5, MDT organic ester 8-12% of water glass; b. Zircon sand 100, water glass 1.5, MDT organic ester 0.5 ~ 0.20; C. chromite 100, water glass 1.6 ~ 1.8, MDT organic esters 0.16 ~ 0.22.