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High-temperature-resistant precoated sand

A technology of coated sand and high temperature resistance, which is applied in the direction of casting molding equipment, molds, cores, etc., can solve the problems of inability to produce coated sand for casting and high acid consumption of wet mold waste sand, and achieve better thermal stability, The effect of low cost and simple preparation process

Inactive Publication Date: 2021-09-03
柳晶(溧阳)环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a method for preparing coated sand from wet mold waste sand with controllable acid consumption value, so as to solve the acid consumption of wet mold waste sand proposed in the above background technology. The value is too high, so it cannot be used in the production of foundry coated sand

Method used

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  • High-temperature-resistant precoated sand

Examples

Experimental program
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Effect test

Embodiment 1

[0029] A high-temperature-resistant coated sand, including 1000 parts of modified wet mold waste sand, 20 parts of resin, 9 parts of urotropine aqueous solution, 1.4 parts of lubricant, and 2 parts of water, wherein the treatment process of modified wet mold waste sand is as follows :

[0030] Put the green mold waste sand into the mixer, and stir at a stirring rate of 30r / min. During the stirring process of the waste sand, add chemical additives accounting for 1% of the weight of the green mold waste sand at one time, and stir for 20 minutes. The waste sand is transferred to a grinder for grinding, and the grinding time is controlled at 35 minutes to obtain the modified damp film waste sand.

[0031] The high temperature resistant coated sand of this embodiment is prepared by the following steps:

[0032] (1) Preheat 1000 parts of modified wet mold waste sand to 140°C and add it to the sand mixer;

[0033] (2) Add 20 parts of phenolic resin to the modified wet mold waste sa...

Embodiment 2

[0036] A high temperature-resistant coated sand, including 1000 parts of modified wet mold waste sand, 30 parts of phenolic resin, 14 parts of urotropine aqueous solution, 2.1 parts of lubricant, and 3 parts of water, wherein the treatment process of modified wet mold waste sand as follows:

[0037] Put the green mold waste sand into the mixer and stir at a stirring rate of 40r / min. During the stirring process of the waste sand, add chemical additives accounting for 1.5% of the weight of the green mold waste sand at one time, stir for 25 minutes, and then The waste sand is transferred to a grinder for grinding, and the grinding time is controlled at 40 minutes to obtain the modified damp film waste sand.

[0038] The high temperature resistant coated sand of this embodiment is prepared by the following steps:

[0039] (1) Preheat 1000 parts of modified wet mold waste sand to 145°C and add it to the sand mixer;

[0040] (2) Add 30 parts of phenolic resin solution to the modif...

Embodiment 3

[0043] A high temperature-resistant coated sand, including 1000 parts of modified wet mold waste sand, 25 parts of phenolic resin, 11 parts of urotropine aqueous solution, 1.8 parts of lubricant, and 4 parts of water, wherein the treatment process of modified wet mold waste sand as follows:

[0044] Put the green mold waste sand into the mixer, and stir at a stirring rate of 50r / min. During the stirring process of the waste sand, add chemical additives accounting for 2% of the weight of the green mold waste sand at one time, stir for 30 minutes, and then mix The waste sand is transferred to a grinder for grinding, and the grinding time is controlled at 40 minutes to obtain the modified damp film waste sand.

[0045] The high temperature resistant coated sand of this embodiment is prepared by the following steps:

[0046] (1) Preheat 1000 parts of modified wet mold waste sand to 150°C and add it to the sand mixer;

[0047] (2) Add 25 parts of phenolic resin to the modified we...

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Abstract

The invention discloses high-temperature-resistant precoated sand. The precoated sand is prepared from the components including 1000 parts of modified wet film waste sand, 20-30 parts of phenolic resin, 9-14 parts of a urotropine aqueous solution, 1.4-2.1 parts of a lubricant and 2-4 parts of water; the modified wet film waste sand is treated through the steps that the wet film waste sand and a chemical additive are placed in a mixer to be mixed uniformly, then the mixture is placed into a grinding machine for mechanical grinding, and the modified wet film waste sand is obtained. According to the high-temperature-resistant precoated sand, the wet film waste sand is used as a raw material, the preparation method is simple, compared with common precoated sand, the high-temperature-resistant precoated sand has the characteristics of being high in tensile strength, good in heat resistance and the like, the production efficiency is improved, the cost is reduced, the preparation technology is simple, and large-scale production can be conducted.

Description

technical field [0001] The invention relates to the technical field of coated sand preparation, in particular to a high temperature resistant coated sand. Background technique [0002] Coated sand refers to the molding sand or core sand whose surface is covered with a layer of solid resin 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; The method is to preheat the sand to a certain temperature, add resin to make it melt, stir to coat the resin on the surface of the sand, add urotropine aqueous solution and lubricant, cool, crush and sieve to obtain coated sand, which is used for casting steel pieces, cast iron pieces. Due to the advantages of high strength, low gas generation, high dimensional accuracy of production castings, smooth surface...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C1/00B22C5/00B22C5/04
CPCB22C1/00B22C5/00B22C5/04
Inventor 吴武灿胡胜利王古月胡金武
Owner 柳晶(溧阳)环保科技有限公司