A kind of preparation method of casting water glass sand
A water glass sand and water glass technology, which is used in foundry molding equipment, machinery for cleaning/processing of mold materials, and molds, etc., can solve the problem of increasing the amount of water glass added, low bonding strength of water glass, and poor collapsibility and other problems to achieve the effect of improving collapsibility, increasing strength and protecting the environment
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Embodiment 1
[0014] A preparation method of water glass sand for casting, the method comprises the steps of:
[0015] 1) Prepare modified water glass; at room temperature, the modulus is 2.5-3.5, and the density is 1.30-1.45g / cm 3 Add the composite modifier that accounts for 8% of the total amount of water glass in the water glass, described composite modifier is made up of talcum powder, starch, polypropylene alcohol, nano-alumina powder, wherein is benchmark with composite modifier total amount Talcum powder accounts for 35%, starch accounts for 12%, polyacryl alcohol accounts for 18%, and nano-alumina powder accounts for 35%. After being stirred evenly, modified water glass is made;
[0016] 2) Preparation of molding sand: add the modified water glass prepared in the step 1) which accounts for 5% of quartz sand to the standard sand for casting, and stir in a sand mixer for 40 minutes.
Embodiment 2
[0018] A preparation method of water glass sand for casting, the method comprises the steps of:
[0019] 1) Prepare modified water glass; at room temperature, the modulus is 2.5-3.5, and the density is 1.30-1.45g / cm 3 Add the compound modifier that accounts for 9% of water glass total amount in the water glass, described compound modifier is made up of talcum powder, starch, polypropylene alcohol, nano-alumina powder, wherein take composite modifier total amount as benchmark Talcum powder accounts for 45%, starch accounts for 10%, polyacryl alcohol accounts for 15%, and nano-alumina powder accounts for 30%. After being stirred evenly, modified water glass is made;
[0020] 2) Preparation of molding sand: Add the modified water glass prepared in the step 1) which accounts for 5.8% of quartz sand into the standard sand for casting, and stir in a sand mixer for 60 minutes.
Embodiment 3
[0022] A preparation method of water glass sand for casting, the method comprises the steps of:
[0023] 1) Prepare modified water glass; at room temperature, the modulus is 2.5-3.5, and the density is 1.30-1.45g / cm 3 In the water glass, add the compound modifier that accounts for 8-10% of water glass total amount, described compound modifier is made up of talcum powder, starch, polypropylene alcohol, nano-alumina powder, wherein the total amount of compound modifier Talcum powder accounts for 50%, starch accounts for 8%, polyacryl alcohol accounts for 16%, and nano-alumina powder accounts for 26% as a benchmark, and after being stirred evenly, modified water glass is made;
[0024] 2) Preparation of molding sand: Add the modified water glass prepared in the step 1) which accounts for 6% of the quartz sand to the standard sand for casting, and stir in a sand mixer for 80 minutes.
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