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Preparation method for sodium silicate sand used for casting

A technology of water glass sand and water glass, which is applied to casting molding equipment, cleaning/processing machinery of casting mold materials, casting molds, etc., and can solve problems such as poor collapsibility, increasing the amount of water glass added, and low bonding strength of water glass and other problems to achieve the effect of improving collapse, increasing strength and protecting the environment

Active Publication Date: 2012-03-07
江苏龙欧新型建材科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the long-term production practice shows that the bonding strength of water glass is low. If you want to increase the strength of water glass core sand, you need to increase the amount of water glass added. Correspondingly, it will inevitably lead to poor collapsibility.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The invention discloses a preparation method for sodium silicate sand used for casting. The method comprises the steps of preparing modified sodium silicate and preparing molding sand, wherein, the modified sodium silicate is prepared by using a composite modifier which comprises 35 to 50% of talcum powder, 6 to 12% of starch, 14 to 18% of polypropylene glycol and 25 to 35% of nanometer alumina powder on the basis of the total amount of the composite modifier. The molding sand in the invention enhances strength and improves collapsibility of the sodium silicate sand.

Description

technical field [0001] The invention relates to the field of casting, in particular to the field of water glass sand sand casting. Background technique [0002] Water glass is a well-known, ancient shape, non-toxic, tasteless, and green casting inorganic binder for core making. It was introduced into casting production in the 1950s (see British patent, GB782205), and has been used for more than 50 years. App History too. Sodium silicate sand has superior and flexible performance, and can be used for both molding and core making. The earliest CO 2 Gas hardening cold box process should belong to water glass-CO 2 Law. However, CO 2 The biggest problem of hardened water glass sand is that it has poor collapsibility after pouring, and it is difficult to remove sand from castings and reuse old sand, which seriously hinders its popularization and application. [0003] Compared with resin sand molds, low modulus sodium silicate sand has many problems such as low strength, poor ...

Claims

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Application Information

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IPC IPC(8): B22C1/18B22C1/02B22C5/04
Inventor 许立新
Owner 江苏龙欧新型建材科技有限公司
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