Binder for casting and preparation method thereof

A binder and starch technology, which is applied in casting molding equipment, casting molds, manufacturing tools, etc., can solve the problems of low bonding strength, large gas generation, and difficulty in recycling, and achieve low cost, good collapsibility, and improved The effect of storage time

Inactive Publication Date: 2016-09-21
欧振云
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Clay is cheap, easy to obtain, and easy to use, but its bonding strength is low, and it is mainly used to make casting molds; oil and synthetic resin binders have high strength and good moisture absorption resistance, but they are expensive and have a large amount of gas generation; although water glass is expensive Inexpensive and high strength, but poor collapsibility and difficult to reuse

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1: A kind of bonding agent for foundry, is characterized in that, is prepared from following components according to weight percentage:

[0020] 28 parts cornstarch

[0021] Formaldehyde 1.7 parts

[0022] Phosphoric acid 0.3 parts

[0023] 3 parts polyvinyl alcohol

[0024] Urea 2 parts

[0025] 65 parts of water.

[0026] A method for preparing a casting binder, comprising the steps of:

[0027] A, formaldehyde, phosphoric acid and water of above-mentioned proportion are mixed in reactor according to proportion;

[0028] B. Add urea and polyvinyl alcohol to dissolve evenly;

[0029] C. Finally, add starch, stir and heat up to 75°C, then continue to stir for 30 minutes to completely dissolve the starch. Detect the pH value of the solution and adjust it with 10% NaOH solution to make the solution neutral. Wherein, the polyvinyl alcohol in the above step B should be pre-prepared as a 10% aqueous solution for use.

Embodiment 2

[0030] Embodiment 2: A casting binder, characterized in that it is prepared from the following components according to weight percentage:

[0031] 32 parts potato starch

[0032] Formaldehyde 1.8 parts

[0033] Phosphoric acid 0.2 part

[0034] 2 parts polyvinyl alcohol

[0035] 4 parts urea

[0036] 60 parts of water.

[0037] The method for preparing above-mentioned foundry binder, comprises the steps:

[0038] A. Mix 1.8 parts of formaldehyde, 0.2 parts of phosphoric acid and 40 parts of water in the reactor according to the ratio;

[0039] B. Add urea and polyvinyl alcohol to dissolve evenly;

[0040] C. Finally, add starch, stir and heat up to 77°C, then continue to stir for 40 minutes to completely dissolve the starch. Detect the pH value of the solution and adjust it with 10% NaOH solution to make the solution neutral. Wherein, the polyvinyl alcohol in the above step B should be pre-prepared as a 10% aqueous solution for use.

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PUM

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Abstract

The invention discloses a binder for casting and a preparation method thereof. According to the binder for casting and the preparation method thereof, an optimum formula is determined through scientific material selection and repeated testing; phosphoric acid is added for catalyzing, so that crosslinking modification is conducted on starch, urea, formaldehyde and the like; the moisture absorption resistance effect of the binder is improved by adding polyving akohol; and moreover, the anti-corrosion effect is achieved by adding the formaldehyde, so that the storage time of the liquid binder is prolonged. The binder for casting has good dry tensile strength and collapsibility, is suitable for cast iron, cast steel, nonferrous metal, various castings and the like and can replace a part of oil sand, water glass sand, self-setting resin sand and the like for manufacturing mold cores. According to the binder for casting, the preparation raw materials are rich, the technology is simple, the cost is low, and using is convenient.

Description

technical field [0001] The invention relates to the field of fine chemicals, in particular to a method for preparing a casting binder. Background technique [0002] In sand casting production, in order to obtain high-strength, high-quality sand molds and cores suitable for high-efficiency production, it is necessary to select a suitable core sand binder. Currently widely used binders include clay, oil binders, water glass and synthetic resins. Clay is cheap, easy to obtain, and easy to use, but its bonding strength is low, and it is mainly used to make casting molds; oil and synthetic resin binders have high strength and good moisture absorption resistance, but they are expensive and have a large amount of gas generation; although water glass is expensive Inexpensive and high strength, but poor collapsibility, difficult to reuse. For this reason, how to coordinate and solve the strength, cost and manufacturability of the core sand binder, and to select and apply a suitable...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C1/26
CPCB22C1/26
Inventor 欧振云
Owner 欧振云
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