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Composite sodium silicate binder for sand mold and preparing method thereof

A technology of water glass and binder, which is applied in the direction of casting molds, cores, manufacturing tools, etc., can solve the problems of high price, high residual strength, and enterprises dare not care about it, so as to improve the compressive strength at room temperature and reduce the residual strength , the effect of residual strength reduction

Active Publication Date: 2013-01-09
河北天琦新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the organic ester hardener imported from abroad is expensive, and most companies dare not pay attention to it.
[0003] The Chinese patent with the application number 200810058329.8 discloses a water glass chemical modifier for foundry and its preparation method and application. Its cost is high and the preparation process is complicated.
[0004] Some domestically produced organic ester hardeners have relatively high residual strength and are compatible with CO 2 The hardening method is still relatively high compared to the price, thus restricting the popularization and application of the organic ester hardening method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The composite water glass bonding agent in the present embodiment is made of the component of following parts by weight: water glass (modulus 2.43, density 1.48g / cm 3 ) 100 parts, straw flour noodles 7 parts, water 1 part.

[0018] The concrete preparation method of above-mentioned binding agent is:

[0019] ①After drying the wheat straw, pulverize it in a pulverizer, pass through a 325-mesh sieve, and obtain straw flour;

[0020] ② Take 7 parts by weight of the above-mentioned straw flour noodles, add them to a mixer, add 1 weight part of water, and then stir the straw flour noodles and water to make the straw flour noodles fully moist and uniform, and obtain moist straw flour noodles;

[0021] ③ Weigh 100 parts by weight of water glass, pour it into a blender and stir evenly with the wet straw powder, and the composite water glass binder obtained through such treatment can be used for sand mixing molding.

[0022] When using the above composite water glass binder fo...

Embodiment 2

[0025] The composite water glass bonding agent in the present embodiment is made of the component of following parts by weight: water glass (modulus 2.43, density 1.48g / cm 3 ) 100 parts, straw flour noodles 5 parts, water 0.5 part.

[0026] The concrete preparation method of above-mentioned binding agent is:

[0027] ① After drying corn or rice straw, crush it in a pulverizer, and pass through a 350-mesh sieve to obtain straw flour;

[0028] ② Take 5 parts by weight of the above-mentioned straw flour noodles, add them to a mixer, add 0.5 weight parts of water, and then stir the straw flour noodles and water to make the straw flour noodles fully moist and uniform, and obtain moist straw flour noodles;

[0029] ③ Weigh 100 parts by weight of water glass, pour it into a blender and stir evenly with the wet straw powder, and the composite water glass binder obtained through such treatment can be used for sand mixing molding.

[0030] When using the above composite water glass bi...

Embodiment 3

[0033] The difference between the binder and Example 1 is that the composite water glass binder includes 100 parts of water glass (modulus 2.43, density 1.48), 10 parts of straw flour and 2 parts of water.

[0034] The manufactured sand mold, after CO 2 After hardening, the room temperature compressive strength is about 2.35MPa; the surface stability is good, which is 95.6%; the residual strength at 1000°C is low, which is 0.78MPa, which is much lower than that of ordinary water glass sand CO 2 Hardened 1000°C residual strength (about 1.5MPa); sand mold collapse is good, casting cleaning and old sand recycling are convenient.

[0035] In summary, the present invention solves the problems of poor collapsibility and difficulty in recycling sand molds using water glass as a binder; using cheap straw as a raw material, compared with other methods for improving the collapsibility of water glass sand, significantly reduces the sand mold (core); and the preparation method of the com...

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Abstract

The invention discloses a composite sodium silicate binder for sand mold and a preparing method thereof. The composite sodium silicate binder is formed by the following components in parts by weight: 100 parts of sodium silicate, 5-10 parts of straw powder paste and 0.5 to 2 parts of water. The preparing method thereof comprises the steps of: 1. drying, crushing and subjecting straws to a sieve not less than 325 meshes in order to obtain the straw powder paste; 2. adding 5-10 parts by weight of the straw powder paste obtained in the step 1 with 0.5 to 2 parts by weight of water, followed by uniform stirring to further obtain wet straw powder paste; and (3) adding the wet straw powder paste with 100 parts by weight of sodium silicate. The composite sodium silicate binder manufactured according to the method solves the problem that the silicate binder is poor in sand mold collapsibility and difficult in recycling when being used as binder; in addition, compared with other methods for improving the sand mold collapsibility of silicate binder, the method according to the invention, in which inexpensive straw is taken as raw material, lowers the cost of sand mold (core) dramatically.

Description

technical field [0001] The invention relates to the field of casting, in particular to a composite water glass binder with good collapsibility for casting sand molds. Background technique [0002] Binders for sand molds (cores) in the foundry industry include clay, water glass, resin, etc. Among them, water glass, as an inorganic chemical binder, has the advantages of low price, wide range of sources, non-toxic and tasteless, etc., and is widely used in the production of cast steel. At present, the main method of hardening water glass sand is CO 2 Hardening method and organic ester hardening method, etc. CO 2 The advantages of the hardening method are fast hardening speed, low cost, and simple equipment. The outstanding disadvantage is that because the strength after hardening is not high enough, more water glass (usually 10% of the sand weight) needs to be added, resulting in poor collapse of the sand mold after pouring, difficulty in casting cleaning and regeneration o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C1/18
Inventor 张忠诚刘瑞玲王忠民
Owner 河北天琦新材料科技有限公司
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