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Furan resin for hot core box

A technology of furan resin and hot core box, which is applied in cores, casting molding equipment, casting molds, etc. It can solve the problems of high temperature at the working site, low core strength, and 24 hours, so as to improve the precision of castings and reduce the curing temperature. , the effect of improving the working environment

Inactive Publication Date: 2011-08-17
十堰市郧县铸邦化工有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] With the rapid development of my country's foundry industry and the extensive use of furan resin sand technology, furan resin for foundry has become an indispensable main adhesive in the foundry industry. The furan resins currently used in the market are mainly hot box and no-bake. The hot core box furan resin needs to be cured at a high temperature above 230°C to meet the requirements of use, resulting in too high a working site temperature and a poor working environment for production workers. At the same time, some cores and molds are thermally deformed, which affects the accuracy of castings. , the self-setting sand has defects such as too long curing time (generally 24 hours), and low strength of the mold and core, which is not conducive to handling

Method used

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  • Furan resin for hot core box

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Experimental program
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Effect test

Embodiment 1

[0009] Embodiment 1: hot box furan resin, made by the following steps:

[0010] (1) Put the measured phenol, formaldehyde, and urea into the reaction kettle, adjust the pH value to 8.5 with an aqueous solution of sodium hydroxide with a concentration of 30% by mass, then raise the temperature, and react within the temperature range of 80-85°C 70 minutes;

[0011] (2) Add the measured furfuryl alcohol, adjust the pH value to 4.5 with a hydrochloric acid aqueous solution with a concentration of 10% by mass, then raise the temperature, and react for 100 minutes at a temperature range of 90-95°C;

[0012] (3) Adjust the pH value to 7.0 with 30% sodium hydroxide aqueous solution by mass percentage, then vacuum dehydrate, add measured glycerol and sorbitol, mix with each other evenly, cool to below 50°C, and discharge.

Embodiment 2

[0013] Embodiment 2: hot core box furan resin, made by the following steps:

[0014] (1) Put the measured phenol, formaldehyde, and urea into the reaction kettle, adjust the pH value to 9.0 with a 30% sodium hydroxide aqueous solution by mass percentage, then raise the temperature, and react within the temperature range of 90-95°C 60 minutes;

[0015] (2) Add the measured furfuryl alcohol, adjust the pH value to 4.5 with an aqueous solution of hydrochloric acid with a mass percent concentration of 10%, then raise the temperature, and react for 110 minutes at a temperature range of 95-98°C;

[0016] (3) Adjust the pH value to 7.0 with 30% sodium hydroxide aqueous solution by mass percentage, then vacuum dehydrate, add measured glycerol and sorbitol, mix with each other evenly, cool to below 50°C, and discharge.

[0017] The technical standard of hot core box furan resin and the inspection result of the present invention contrast the following table:

[0018]

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Abstract

The invention provides furan resin for a hot core box. The furan resin consists of the following components in part by mass: 375+ / -5 parts of formaldehyde, 85+ / -5 parts of urea, 100+ / -5 parts of phenol, 600+ / -5parts of furfuryl alcohol, 50+ / -5 parts of glycerol, and 20+ / -5 parts of sorbitol. The furan resin is prepared by the following steps of: (1) putting the phenol, the formaldehyde and the urea into a reaction kettle, regulating the pH value to be between 8.5 and 9.0 by using 30 mass percent aqueous solution of sodium hydroxide, and reacting for 60 to 80 minutes at the temperature of between 80 and 95 DEG C; (2) adding the furfuryl alcohol, regulating the pH value to be between 4.5 and 4.8 by using 10 mass percent aqueous solution of hydrochloric acid, and reacting for 90 to 110 minutes at the temperature of between 90 and 98 DEG C; and (3) regulating the pH value to be 7.0 by using 30 mass percent aqueous solution of sodium hydroxide, then performing vacuum dehydration, adding the glycerol and the sorbitol, mixing uniformly, cooling to the temperature of less than 50 DEG C, and emptying. The curing temperature of the furan resin is between 160 and 170 DEG C; and by reducing the curing temperature, the energy is saved, the consumption is reduced, the working environment of production workers is improved, and the precision of castings is improved.

Description

technical field [0001] The invention belongs to a hot core box furan resin cured at medium temperature for casting. Background technique [0002] With the rapid development of my country's foundry industry and the extensive use of furan resin sand technology, furan resin for foundry has now become an indispensable main adhesive in the foundry industry. The furan resin currently used in the market is mainly two types of hot box and no-bake. At present The hot core box furan resin needs to be cured at a high temperature above 230°C to meet the requirements of use, resulting in too high a working site temperature and a poor working environment for production workers. At the same time, some cores and molds are thermally deformed, which affects the accuracy of castings. , No-bake sand has defects such as too long curing time (generally 24 hours), low mold and core strength, which is not conducive to handling. Contents of the invention [0003] The invention proposes a hot box fu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G16/04B22C1/22
Inventor 辛杰尹俊
Owner 十堰市郧县铸邦化工有限责任公司