Cold-process inorganic phosphate precoated sand and preparation method thereof

A technology of inorganic phosphate and coated sand, applied in the direction of molding machines, manufacturing tools, casting molding equipment, etc., can solve the problems of toxic gas, high energy consumption of resin, secondary pollution, etc., to save costs and improve resistance to moisture absorption The effect of simplification and molding process

Active Publication Date: 2019-01-01
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The melting of resin in the preparation process of traditional organic coated sand consumes a lot of energy, and produces toxic gas during the molding and pouring process, causing secondary pollution

Method used

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  • Cold-process inorganic phosphate precoated sand and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1. Weigh 950g of raw sand, 30g of inorganic phosphate binder, and set aside;

[0026] 2. Add raw sand and inorganic phosphate binder into the mixer and stir for 120 seconds;

[0027] 3. Add 2 parts of magnesia powder and continue stirring for 30 seconds;

[0028] 4. The mixer continues to stir, and the liquid nitrogen is continuously fed into the mixer, so that the wet coated sand is frozen and solidified in the low temperature environment of liquid nitrogen, and the amount of liquid nitrogen added is 0.5L (405g);

[0029] 5. Break the large solid coated sand with a mixer;

[0030] 6. The crushed coated sand is screened to obtain granular coated sand;

[0031] 7. Inject granular coated sand into the mold through a core shooter (mold temperature 140°C, sand injection pressure 4MPa);

[0032] After 8.4 minutes, open the mold and eject the sand sample.

Embodiment example 2

[0034] 1. Weigh 960g of raw sand, 40g of inorganic phosphate binder, and set aside;

[0035] 2. Add raw sand and inorganic phosphate binder into the mixer and stir for 120 seconds;

[0036] 3. Add 3 parts of magnesia powder and continue stirring for 30 seconds;

[0037] 4. The mixer continues to stir, and liquid nitrogen is continuously added to the mixer, so that the wet coated sand is frozen and solidified under the low temperature environment of liquid nitrogen, and the amount of liquid nitrogen added is 1L (810g);

[0038] 5. Break the large solid coated sand with a mixer;

[0039] 6. The crushed coated sand is screened to obtain granular coated sand;

[0040] 7. Inject the sieved sand into the mold through a core shooter (mold temperature 145°C, sand injection pressure 4MPa);

[0041] After 8.4 minutes, open the mold and eject the sand mold.

Embodiment example 3

[0043] 1. Weigh 980g of raw sand and 50g of inorganic phosphate binder, set aside;

[0044] 2. Add raw sand and inorganic phosphate binder into the mixer and stir for 120S;

[0045] 3. Add 5 parts of magnesia powder and continue to stir for 30 seconds;

[0046] 4. The mixer continues to stir, and liquid nitrogen is continuously added to the mixer, so that the wet coated sand is frozen and solidified under the low temperature environment of liquid nitrogen, and the amount of liquid nitrogen added is 2L (1620g);

[0047] 5. Break the large solid coated sand with a mixer;

[0048] 6. The crushed coated sand is screened to obtain granular coated sand;

[0049] 7. Inject the sieved sand into the mold through a core shooter (mold temperature 150°C, sand injection pressure 4MPa);

[0050] 8. After 4 minutes, open the mold and eject the sand mold.

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Abstract

The invention discloses cold-process inorganic phosphate precoated sand and a preparation method thereof, and relates to the field of casting moulding. The preparation method comprises the following steps: adding an inorganic phosphate binder accounting for 3-5% by weight of crude sand into the crude sand, and sufficiently and uniformly mixing by a sand mixer; adding a moisture absorption resistant agent and stirring; continuously introducing liquid nitrogen accounting for 40.5-162% by mass of the crude sand after the wet sand is frozen and solidified, breaking and sieving to obtain the cold-process inorganic phosphate precoated sand. The preparation method of the inorganic precoated sand can replace conventional precoated sand production and core making technology and has the incomparableadvantages of traditional precoated sand and inorganic hot-process precoated sand, realizes low-pollution emission, low energy consumption and high strength of precoated sand mould, and thus has a broad application prospect in the foundry industry.

Description

technical field [0001] The invention relates to coated sand for phosphate casting, in particular to a cold-process inorganic coated sand for casting and a preparation method thereof. Background technique [0002] The cold method inorganic phosphate coated sand is a new type of preparation method of inorganic coated sand with environmental protection and low energy consumption. The organic coated sand currently used in casting is the molding sand or core sand whose surface is covered with a solid resin film before molding. There are two coating processes: cold method and hot method: the cold method dissolves the resin with ethanol, and adds urotropine during the sand mixing process, so that the two are coated on the surface of the sand, and the ethanol volatilizes to obtain coated sand; Preheat the sand to a certain temperature, add resin to melt, stir to coat the resin on the surface of the sand, add urotropine aqueous solution and lubricant, cool, crush, and sieve to obtai...

Claims

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Application Information

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IPC IPC(8): B22C1/18B22C15/24
CPCB22C1/185B22C15/24
Inventor 张友寿蔡鹏夏露任彦臻周磊刘栋
Owner HUBEI UNIV OF TECH
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