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High-compressive-strength composite modified sodium silicate sand for pump valve castings, and preparation method thereof

A technology of compressive strength and water glass sand, which is applied in casting molding equipment, casting molds, manufacturing tools, etc., can solve the problems of difficulty in improving the quality of pump and valve castings, difficulty in recycling old sand, and low strength at room temperature, and achieve excellent room temperature. Wet strength, improvement of stress defect, effect of low dosage

Inactive Publication Date: 2016-03-23
合肥李诺新材料贸易有限公司
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Castings of pumps and valves have the characteristics of thin walls and complex shapes. In the casting process, the quality requirements for molding sand are particularly strict. The quality of molding sand is also an important factor related to the quality of castings. Although water glass molding sand has significant advantages, there are also many Disadvantages, obvious defects are mainly manifested in low strength at room temperature, poor collapsibility, and difficulty in regenerating old sand. If it is not modified, it is difficult to improve the quality of pump valve castings

Method used

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Examples

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Comparison scheme
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Embodiment Construction

[0012] The water glass sand in this example is prepared from the following raw materials in parts by weight: 50 mesh zircon sand 40, 80 mesh white corundum powder 30, graphite powder 1, 100 mesh alumina 8, perfluoropolyether 1, potassium carbonate 0.8, modified Water glass adhesive 1.5, bentonite 2, choline chloride 0.1, nano calcium fluoride 0.4, 50% ethanol aqueous solution 8, silane coupling agent 0.1.

[0013] Wherein the modified water glass adhesive is made of the following raw materials by weight: water glass 12 of 40 Baume degrees, magnesium aluminum silicate 0.1, bacterial cellulose 2, quaternary ammonium salt ionic liquid 6; its modification preparation method is : first put the bacterial cellulose into the quaternary ammonium salt ionic liquid, heat to 40°C, stir and mix for 2 hours, then add other remaining materials, continue to stir and mix for 40 minutes to obtain the product.

[0014] The preparation method of this embodiment water glass sand is:

[0015] (1) ...

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Abstract

The invention discloses high-compressive-strength composite modified sodium silicate sand for pump valve castings. A modified sodium silicate binder in the sodium silicate sand is higher in constant-temperature wet strength, thixotropy and rheological property compared with a conventional modified sodium silicate binder, high in reaction binding activity, green and environment-friendly, and lower in dosage; sand materials in a formula can be mixed to form a high-strength and high-breathability material, the added perfluoropolyether is high in lubricating property and high-temperature stability, and capable of effectively improving stress defects in the material, increasing compressive strength, and enabling the material to be more compact in structure, and bentonite-supported nano-calcium fluoride has lubrication and reinforcement effects in case of being dispersed in the sand materials, and capable of forming a non-stick impermeable layer and preventing sand sticking of the castings; and the composite modified sodium silicate sand is excellent in comprehensive performance, not liable to absorb moisture, high in use efficiency, fast to scatter and clean, and capable of meeting the pouring requirements of the high-accuracy pump valve castings.

Description

technical field [0001] The invention relates to the technical field of water glass sand, in particular to a composite modified water glass sand with high compressive strength for pump and valve castings and a preparation method thereof. Background technique [0002] Molding sand is mainly a kind of material used for molding in casting, which is made by mixing sand materials, adhesives and auxiliary substances according to different proportions. According to the different adhesives used, it can be divided into clay sand and water glass sand. , resin sand, etc. Among them, water glass sand has the advantages of high strength, low cost, simple process, and low pollution, and is widely used. [0003] Castings of pumps and valves have the characteristics of thin walls and complex shapes. In the casting process, the quality requirements for molding sand are particularly strict. The quality of molding sand is also an important factor related to the quality of castings. Although wat...

Claims

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Application Information

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IPC IPC(8): B22C1/00B22C1/16
Inventor 李诺
Owner 合肥李诺新材料贸易有限公司
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