A method for improving the performance of casting water glass with polyetheramine
A technology of water glass and polyether amine, which is applied in the direction of casting molding equipment, casting molds, manufacturing tools, etc., and can solve the limitation of application range, the strength of water glass sand, the fluidity of collapsibility and low recycling rate, and the defects of casting pores, etc. question
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Embodiment 1
[0023] Pretreatment of water glass, the steps are as follows: 1) Heat the water glass solution at 50°C for 40 minutes, and stir while heating; 2) Cool the above water glass solution to 15°C to obtain the pretreated water glass solution .
[0024] At an ambient temperature of 25°C, weigh 30g of the pretreated water glass solution (modulus 2.0) into a glass beaker, add water to dilute to a density of 1.2g / ml, and then add polyether with a molecular weight of 230 Amine, added in an amount of 0.4% of the diluted water glass solution mass, stirred until uniformly mixed.
[0025] Taking relative fluidity as the fluidity index, relative fluidity is the ratio of the flow time of a certain volume of deionized water + water in the measuring instrument to the flow time of the same volume of modified water glass solution. The greater the relative fluidity, the better the fluidity. The measured relative fluidity of the modified water glass binder is 0.17, which is 11.1% higher than that o...
Embodiment 2
[0028] Pretreatment of water glass, the steps are as follows: 1) Heat the water glass solution at 70°C for 20 minutes, and stir while heating; 2) Cool the above water glass solution to 20°C to obtain the pretreated water glass solution .
[0029] At an ambient temperature of 27°C, weigh 30 g (modulus 2.8) of the pretreated water glass solution into a glass beaker, add water to dilute to a density of 1.3 g / ml, and then add polycarbonate with a molecular weight of 230 to it. Ether amine, the addition amount is 0.8% of the water glass solution quality after dilution, stirs until mixing evenly.
[0030] The relative fluidity measured by the example 1 method of the modified water glass binder is 0.18, which is improved by 7.4% compared with the unmodified water glass sand prepared under the same conditions.
[0031] Prepare sample by example 1 method and record that the normal temperature tensile strength of modified water glass sand is 1.34MPa, and normal temperature flexural str...
Embodiment 3
[0033] Pretreatment of water glass, the steps are as follows: 1) Heat the water glass solution at 100°C for 10 minutes, and stir while heating; 2) Cool the above water glass solution to 27°C to obtain the pretreated water glass solution .
[0034] At an ambient temperature of 27°C, weigh 30 g (modulus 3.5) of the pretreated water glass solution into a glass beaker, add water to dilute to a density of 1.5 g / ml, and then add polycarbonate with a molecular weight of 230 Ether amine, added in an amount of 1.0% of the diluted water glass solution mass, stirred until uniformly mixed.
[0035] The relative fluidity measured by the method of example 1 of the modified water glass binder is 0.15, which increases by 3.5% compared with the unmodified water glass sand prepared under the same conditions.
[0036] The sample is prepared according to the method of Example 1 and the normal temperature tensile strength of the modified water glass sand reaches 0.85MPa, and the normal temperatur...
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Abstract
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