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Curing agent for furan resin self-hardening sand for casting and preparation method thereof

A technology of furan resin and no-bake sand, which is applied in casting molding equipment, casting molds, manufacturing tools, etc. It can solve the problem of narrow range of total acidity of benzene sulfonic acid curing agent, difficulty in increasing the total acidity of curing agent, and difficulty in guaranteeing product quality, etc. problem, achieve the effect of reducing consumption cost, high initial strength and final strength, and fast curing speed

Active Publication Date: 2013-01-09
广东省铸力铸材科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The products made by using these raw materials and processes have the following disadvantages: (1) The demand for benzene, toluene and xylene is large, and the production cost is high; (2) The curing agent contains a certain amount of free benzene, which is volatile, And the smell is strong, which will cause great harm to the health of the staff; (3) The total acidity range of the benzene sulfonic acid curing agent is too narrow, and it is difficult to increase the total acidity of the curing agent for molding s

Method used

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  • Curing agent for furan resin self-hardening sand for casting and preparation method thereof
  • Curing agent for furan resin self-hardening sand for casting and preparation method thereof
  • Curing agent for furan resin self-hardening sand for casting and preparation method thereof

Examples

Experimental program
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Effect test

Example Embodiment

[0030] Example one:

[0031] In this embodiment, a 1000L enamel reactor is used. In parts by weight, the curing agent for furan resin self-hardening sand for casting described in this embodiment is composed of the following components:

[0032] Phenol 200, sulfuric acid 250, methanol 150,

[0033] Maleic anhydride 50, water 300.

[0034] The preparation method of the above-mentioned curing agent for furan resin self-hardening sand for casting includes the following steps:

[0035] (1) Pump the melted phenol into the reaction kettle, slowly add sulfuric acid while stirring, and control the feeding temperature at ≤90℃; after the sulfuric acid is added, control the material temperature at 95~100℃ to cause sulfonation reaction 1.5 hours;

[0036] (2) After the sulfonation reaction time is up, reduce the material temperature to below 75°C, slowly add methanol to carry out the esterification reaction, the reaction temperature is 70-75°C, and the esterification time is 1 hour;

[0037] (3) Afte...

Example Embodiment

[0039] Embodiment two:

[0040] In this embodiment, a 1000L enamel reactor is used. In parts by weight, the curing agent for furan resin self-hardening sand for casting described in this embodiment is composed of the following components:

[0041] Phenol 250, sulfuric acid 425, methanol 175,

[0042] Maleic anhydride 35, water 400.

[0043] The preparation method of the above-mentioned curing agent for furan resin self-hardening sand for casting includes the following steps:

[0044] (1) Pump the melted phenol into the reaction kettle, slowly add sulfuric acid while stirring, and control the feeding temperature at ≤90℃; after the sulfuric acid is added, control the material temperature at 95~100℃ to cause sulfonation reaction 2 hours;

[0045] (2) After the sulfonation reaction time is up, reduce the material temperature to below 75°C, slowly add methanol to carry out the esterification reaction, the reaction temperature is 70-90°C, and the esterification time is 2 hours;

[0046] (3) Af...

Example Embodiment

[0048] Embodiment three:

[0049] In this embodiment, a 2000L enamel reactor is used. In parts by weight, the curing agent for furan resin self-hardening sand for casting described in this embodiment is composed of the following components:

[0050] Phenol 300, sulfuric acid 940, methanol 200,

[0051] Maleic anhydride 25, water 500.

[0052] The preparation method of the above-mentioned curing agent for furan resin self-hardening sand for casting includes the following steps:

[0053] (1) Pump the melted phenol into the reaction kettle, slowly add sulfuric acid while stirring, and control the feeding temperature at ≤90℃. After the sulfuric acid is added, the temperature of the material is controlled at 95~100℃ for sulfonation reaction for 3 hours;

[0054] (2) After the sulfonation reaction time is up, lower the material temperature to below 75°C, slowly add methanol to carry out the esterification reaction, the reaction temperature is 70-75°C, and the esterification time is 2 hours;

...

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Abstract

The invention discloses a curing agent for furan resin self-hardening sand for casting and a preparation method thereof, and aims to provide the curing agent for the furan resin self-hardening sand for casting, which can reduce the production cost, is environment-friendly, has good curing speed and good solid permeability, and is suitable for a low-temperature and high-humidity environment, and the preparation method thereof. The curing agent for the furan resin self-hardening sand for casting disclosed by the invention is formed by the following components in parts by weight: 200-300 parts of phenol, 250-940 parts of sulfuric acid, 150-200 parts of methanol, 25-50 parts of maleic anhydride and 300-500 parts of water. After the phenol and the sulfuric acid are subjected to a sulfonation reaction, the methanol and the sulfuric acid which is not reacted are subjected to an esterification reaction; and a product is prepared by adding less maleic anhydride and water to dilute. The curing agent for the furan resin self-hardening sand for casting and the preparation method thereof can be widely applied to the field of the curing agent for the furan resin self-hardening sand for casting.

Description

technical field [0001] The invention relates to the field of sand mold (core) casting, in particular to a curing agent for casting furan resin self-setting sand and a preparation method thereof. Background technique [0002] With the continuous deepening and development of the foundry industry, new requirements are put forward for the raw and auxiliary materials of the foundry industry, especially higher requirements are put forward in terms of environmental protection, energy saving and reducing the cost of raw material consumption. In the prior art, as a curing agent for furan resin sand, benzene, toluene and xylene have been used as sulfonated compounds, sulfuric acid as a sulfonating agent, and the product is synthesized under certain process conditions. The products made by using these raw materials and processes have the following disadvantages: (1) The demand for benzene, toluene and xylene is large, and the production cost is high; (2) The curing agent contains a cer...

Claims

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Application Information

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IPC IPC(8): B22C1/10
Inventor 刘春晶谢树忠李方义
Owner 广东省铸力铸材科技有限公司
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