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Composite powder binding agent containing gelatinized phosphate starch and kaolin and preparation method thereof

A technology of kaolin and phosphate ester, which is applied in the field of foundry binders, can solve the problems of large gas generation and environmental pollution of resin binders, and achieve the effects of high temperature resistance, high dry tensile strength and simple process

Inactive Publication Date: 2011-08-03
FUZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problems of serious environmental pollution and large gas generation of resin binders at present, and to provide an environmentally friendly pasting phosphate starch kaolin composite powder binder for foundry. The binder has high strength and is resistant to Good moisture absorption

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 1. raw material

[0037] Starch: tapioca starch, Fujian Northwest

[0038] Kaolin: Fujian Longyan Kaolin Company

[0039] 2. Specific preparation method:

[0040] (1) Preparation of phosphate starch:

[0041] Spray 20mL of a mixed solution of disodium hydrogen phosphate and sodium dihydrogen phosphate with a pH of 5.5 and 1mol / L evenly on the surface of 100g of tapioca starch, mix in a high-speed kneader for 3 minutes, and dry at 40°C until the water content is lower than 10 %. Finally, it was fired at 150°C for 3 hours. After cooling to room temperature, crush, grind, and sieve (100 mesh). Obtain phosphate ester starch 100g.

[0042] (2) Preparation of modified kaolin

[0043] At a temperature of 70°C, 100 g of kaolin was dispersed in 200 mL of 0.1% octadecyltrimethylammonium bromide aqueous solution, stirred and reacted for 30 minutes, and then suction-filtered to obtain organic kaolin. The obtained organic kaolin was dispersed in 200 mL of water, 1.0 g of tit...

Embodiment 2

[0047] 1. raw material

[0048] Starch: corn starch, Northeast provinces

[0049] Kaolin: Fujian Longyan Kaolin Company

[0050] 2. Specific preparation method:

[0051] (1) Preparation of phosphate starch:

[0052] Spray 30mL of pH 6.0, 0.8mol / L mixed solution of disodium hydrogen phosphate and sodium dihydrogen phosphate evenly on the surface of 100g of cornstarch, mix in a high-speed kneader for 5 minutes, and dry at 50°C until the water content is below 10%. Finally, it was fired at 170°C for 2 hours. After cooling to room temperature, crush, grind, and sieve (100 mesh). Obtain phosphate ester starch 100g.

[0053] (2) Preparation of modified kaolin

[0054] At a temperature of 80°C, disperse 100g of kaolin in 300mL of 0.1% aqueous solution of octadecyltrimethylammonium bromide, stir and react for 60 minutes, and filter with suction to obtain organic kaolin without drying. The obtained organic kaolin was dispersed in 300 mL of water, 1.5 g of titanate coupling ag...

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Abstract

The invention provides a preparation method of a composite powder binding agent containing gelatinized phosphate starch and kaolin, and belongs to the technical field of binding agents for casting. The preparation method comprises the following steps of: firstly preparing the phosphate starch through a dry method; and combining and gelatinizing the obtained phosphate starch and coupling agent modified kaolin to obtain the composite powder binding agent containing the gelatinized phosphate starch and the kaolin for casting. After tapioca is esterified, a part of hydroxyls are converted into ester groups, and the function of hydrogen bonds between starch molecular chains is weakened; therefore, the sand flowability and the damp absorption resistance of the binding agent are obviously improved. Due to the adding of organic kaolin, the flowability of core sand is increased, and the high temperature resistance of the core sand is improved. The core sand prepared from the binding agent product has the characteristics of high tensile strength, good damp absorption resistance and excellent high temperature resistance, can be used for replace combined resin sand and a part of resin sand to produce level II mud cores, has the advantages of needing low cost, being environment-friendly, being convenient to transport and the like, has obvious economic benefit, and can be widely applied in the casting field.

Description

technical field [0001] The invention relates to the technical field of casting binders, in particular to a starch kaolin composite powder binder and a preparation method thereof. Background technique [0002] The foundry binder and its application technology are the main factors affecting the sand casting production environment and the performance of the mold and core sand. In sand casting, in order to obtain high-quality sand cores, it is necessary to choose a suitable core sand binder. Currently widely used binders include clay, oil binders, water glass and synthetic resins. These binders have their own advantages and scope of application, but there are also some problems, such as clay is cheap and easy to use, but the bonding strength is low; oil and synthetic resin binders have high strength and good moisture absorption resistance. , but the cost is high, the amount of gas generated is large, and the environment is seriously polluted; although water glass is cheap and ...

Claims

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Application Information

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IPC IPC(8): B22C1/16C08B31/06
Inventor 郑玉婴
Owner FUZHOU UNIVERSITY
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