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Ester curing type sand binder for casting and its preparation method

A curing type and binder technology, which is used in casting molding equipment, casting molds, cores, etc., to reduce hot crack defects, reduce repair welding rate, and have good collapsibility.

Inactive Publication Date: 2007-08-01
SHENYANG HYATON FOUNDRY MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The patented binder does not involve the application of water glass ester solidified old sand reclaimed sand

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Feeding ratio:

[0055] Sodium silicate solid-4 970kg

[0056] Solid Potassium Silicate 25kg

[0057] Potassium hydroxide 30kg

[0058] Sodium hydroxide 3kg

[0059] Water 1310kg

[0060] Add the high-pressure tank, press the feeding flange, start stirring, feed steam to raise the temperature, raise it to 158-169°C, keep the pressure for 2 hours, discharge the material into the material tank, and release the clear liquid after natural precipitation for 72 hours. Chemical analysis of the binder The chemical composition obtained is:

[0061] SiO 2 28%

[0062] K 2 O 1.16%

[0063] Na 2 O 13.8%

[0064] Water 57.04%

[0065] The binder is marked as A1 and listed in Table 1. The viscosity at 25°C is 195mPa.S.

Embodiment 2

[0067] Feeding ratio:

[0068] Industrial sodium silicate solid-5 400kg

[0069] Potassium hydroxide 33.3kg

[0070] Water 528kg

[0071] Add a high-pressure tank, and the manufacturing process is the same as in Example 1 to obtain binder A2, which is listed in Table 1.

Embodiment 3

[0073] Feeding ratio:

[0074] The solid sodium potassium silicate type I 208kg

[0075] Industrial Sodium Silicate Solid-5 208kg

[0076] Sodium hydroxide 47kg

[0077] Water 420kg

[0078] Add to high pressure tank. The manufacturing process is the same as in Example 1 to obtain adhesive A3, which is listed in Table 1.

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PUM

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Abstract

An ester solidifying mould sand binding agent for casting, its characteristics are: the mass percentage of main chemical component is: SiO2 24 ~ 32, K2O 0.5-28, Na2O 1-21, water 47-65. The binding agent of the invention has high solid content and low viscosity, and has proper work time when used in ester vulcanized water glass cold-setting sand, the stripping time can be adjusted according the requirements of art at will, the mould and core have characteristics of moisture-resistance, deformation, no crush, high strength, stable core size, good collapsibility of core after casting and easy sand shakeout. The old sands can be used for regenarate sand 100%. It can be used for single-piece and small-volume castings production, also be used for mechanized production line to achieve large-volume castings production.

Description

technical field [0001] The invention relates to casting modeling materials, and in particular provides a binder for casting ester solidified self-setting sand and a preparation method of the molding sand binder. Background technique [0002] As far back as the 17th century, when people were making glass, they increased the amount of soda ash added, resulting in a viscous fluid soluble in water, which was later widely used as a binder and was customarily called water glass. my country's annual output of sodium silicate is more than 1 million tons, and more than 300,000 tons are used as casting binders, of which more than 90% are blown with CO 2 Hardening process, the addition of water glass in this process reaches 6-8%. With this water glass as binder CO 2 Casting molds and cores produced by the hardening process have poor collapsibility after pouring, and casting sand removal requires a lot of manpower and material resources. Moreover, the old sand has serious agglomerati...

Claims

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Application Information

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IPC IPC(8): B22C1/18
Inventor 余明伟
Owner SHENYANG HYATON FOUNDRY MATERIAL
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