Water glass sand hardener

A technology of water glass sand and hardener, which is applied to casting molding equipment, molds, cores, etc., can solve the problems of insufficient research on the properties of ester hardeners, high residual strength of water glass sand, and expensive ester hardeners, etc., to achieve Reduction of residual strength, good hardening effect, and strength-enhancing effect

Inactive Publication Date: 2011-01-12
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the ester hardeners imported from abroad are expensive, and most companies dare not pay attention to them; some domestically produced ester hardeners have relatively high r

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0022] Example one

[0023] The water glass sand hardener is mixed according to the weight percentages listed in Table 1.

[0024] The preparation steps of the above water glass sand hardener:

[0025] ① Dissolve soluble acid phosphate and urea in water according to the weight percentage in Table 1 to obtain solution A;

[0026] ② In the solution A described in step ①, respectively add the above-mentioned weight percentage of phosphoric acid and organic ester with a mass concentration of 80%, and mix them evenly to obtain a water glass sand hardener.

[0027] When using the above water glass sand hardener, the ratio of water glass sand is: quartz sand 100%, water glass (modulus 2.43, density 1.48) added is 4% of the weight of quartz sand, and hardener added is the weight of water glass Of 10%. First, the hardener of the present invention is directly mixed with the quartz sand according to the above-mentioned ratio, and then water glass is added and mixed evenly. Then carry out the co...

Example

[0028] Example 2~Example 5

[0029] The components and contents of the water glass sand hardener are shown in Table 1, and the test results are shown in Tables 2 to 4.

[0030] The preparation method and application of the water glass sand hardener are the same as in the first embodiment.

[0031] Table 1 Composition and content of water glass sand hardener

[0032]

[0033] Note: 1) The soluble acid phosphate is aluminum dihydrogen phosphate or sodium dihydrogen phosphate.

[0034] 2) The organic ester is glycerol diacetate, ethylene glycol monoacetate or diethylene glycol monoacetate.

[0035] Table 2 Test results using the present invention at 0~5℃

[0036]

[0037] Table 3 Test results using the present invention at 12~18℃

[0038]

[0039] Table 4 Test results using the present invention at 25~30℃

[0040]

[0041] The test results show that the new hardener of the present invention has different hardening speeds for sodium silicate sand, and can adapt to different speed requirements; ...

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Abstract

The invention discloses a water glass sand hardener which is composed of the following components in percentage by weight: 20-80% of organic ester, 6-24% of phosphoric acid with the mass concentration of 80%, 2-8% of soluble acid phosphate, 1-4% of urea and 11-44% of water. The preparation method is as follows: mixing and dissolving the soluble acid phosphate and the urea into the water to form a solution; and evenly mixing with the phosphoric acid and the organic ester to obtain the water glass sand hardener. The water glass sand hardener of the invention has the advantages of convenient use, good hardening effect, low cost and controllable hardening speed, can obviously lower the water glass addition and obviously improves the moulding sand collapsibility.

Description

technical field [0001] The invention relates to a foundry sand hardener, in particular to a water glass sand hardener. Background technique [0002] The binders used for modeling (core) 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 ester hardening method, etc. [0003] Among them, CO 2 The principle of the hardening method is: water glass sand is blown into CO 2 When the gas is hardened, the surface layer of water glass absorbs CO 2 And its modulus increases and dehydration, under the double action of acidification and dehydration, it hardens rapidly to form the initial strength. The solidified surface water glass blocks the CO 2 Penetrating into the deep layer, the inner ...

Claims

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Application Information

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IPC IPC(8): B22C1/10B22C1/18
Inventor 刘瑞玲张忠诚王忠民
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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