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Montmorillonite-polyurethane emulsion composite water-soluble mold core and preparation method thereof

A technology of polyurethane emulsion and water-soluble core, applied in the direction of core, casting molding equipment, casting mold, etc., can solve the problems of poor comprehensive performance of water-soluble core, unsatisfactory water-soluble collapsibility, and poor core strength, etc. Achieve the effect of high practical value, good dimensional stability, and improved tensile properties

Inactive Publication Date: 2016-09-28
BENGBU HONGAN PRECISION MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the comprehensive performance of water-soluble cores is not good, and there are still defects such as poor core strength, easy deformation and cracking, and unsatisfactory water-soluble collapse, which limits its wide application.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0015] A kind of montmorillonite-polyurethane emulsion composite water-soluble core, it is made by the raw material of following weight part:

[0016] Montmorillonite 40, gypsum powder 3, sodium chloride 5, water glass 5, aluminum isopropoxide 0.1, water-based polyurethane emulsion 3 with a solid content of 40%, ethylene glycol ethyl ether acetate 0.3, hydroxyethyl urea 2, carboxylate Methylcellulose 1, bonding aid 10;

[0017] The bonding aid is made of the following raw materials in parts by weight: 3 guar gum, 0.5 acrylic acid, 0.3 alkenyl succinic anhydride, 0.01 ammonium persulfate, 1 calcium lignosulfonate, 0.1 silane coupling agent KH-570, Water 40; The preparation method of the bonding aid is to add guar gum, alkenyl succinic anhydride and calcium lignosulfonate to water and stir for 1 hour at 80°C, then add the rest of the raw materials at 60°C and stir at 1000r / min for 1 hour, and then get the product after cooling .

[0018] A preparation method of montmorillonite...

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PUM

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Abstract

The invention discloses a montmorillonite-polyurethane emulsion composite water-soluble mold core. The montmorillonite-polyurethane emulsion comprises the following raw materials in parts by weight: 40-50 parts of montmorillonite, 3-5 parts of gypsum powder, 5-10 parts of sodium chloride, 5-10 parts of soluble glass, 0.1-0.15 parts of aluminium isopropoxide, 3-5 parts of an aqueous polyurethane emulsion with solid content being 40-50%, 0.3-0.5 parts of ethylene glycol monoethyl ether acetate, 2-4 parts of hydroxyethylurea, 1-2 parts of carboxymethylcellulose, and 10-15 parts of a bonding auxiliary agent. The water-soluble mold core has the advantages of good intensity, stability, low hygroscopicity, good toughness, difficult generation of cracks and defects, good water soluble collapsibility, easy cleaning, environment protection, and high practical value.

Description

technical field [0001] The invention relates to the field of casting technology, in particular to a montmorillonite-polyurethane emulsion composite water-soluble core and a preparation method thereof. Background technique [0002] There are a large number of components in the manufacturing industry, and their inner walls are thin-walled and complex structures, some of which are almost closed, and some are connected into one. Currently commonly used resin cores, metal cores, etc. have poor collapsibility, and the inner cavity of the casting is difficult to clean after pouring, which affects the smoothness and dimensional accuracy of the inner surface of the casting, and cannot meet the needs of such castings. Therefore, it is necessary to develop high-performance water-soluble cores. [0003] The water-soluble core refers to the core made of water-soluble materials as binders and fillers, and then made by casting, pressing and sintering and other molding methods. After the ...

Claims

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Application Information

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IPC IPC(8): B22C9/10B22C1/00B22C1/16B22C1/20
CPCB22C1/00B22C1/167B22C1/20B22C9/105
Inventor 张洪滨
Owner BENGBU HONGAN PRECISION MACHINERY