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Production technology of furan resin used for casting steel

A technology of furan resin and production process, which is applied in the direction of casting molds, manufacturing tools, casting molding equipment, etc., can solve the problems of lower production efficiency, high cost, and long time consumption, and achieve the effect of resource saving

Active Publication Date: 2012-11-14
GANSU KOCEL CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the production process of traditional furan resin, vacuum distillation is used for dehydration. This process not only consumes a lot of heat but also takes a long time, which not only causes energy waste, but also reduces production efficiency and causes a certain degree of environmental pollution.
The waste water generated in the resin production process is usually treated by incineration, oxidant oxidation and other methods. In the actual operation process, the cost is high, the effect is poor, it does not play a good role, and it will cause secondary pollution to the environment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment one: a kind of production technique of furan resin for cast steel, this technique comprises the steps:

[0020] a. Close the discharge valve at the bottom of the kettle, open the feed valve, add 27.5% furfuryl alcohol, start the mixer, add 6.4% urea and 6.6% paraformaldehyde, close the feed valve, add 1% alkaline catalyst, and the pH value of the seasoning solution is 9- 10;

[0021] b. Open the steam valve, raise the temperature to 98°C within 30-40 minutes, and keep the temperature for 70 minutes;

[0022] c. After the heat preservation is over, turn on the cooling water, lower the temperature to 80°C, add 18.7% furfuryl alcohol, add 1% acid catalyst, and adjust the pH value of the seasoning solution to 3.6; open the steam valve, heat up to 96°C within 20-30 minutes, and keep warm for 60 minute;

[0023] d. When the temperature drops below 90°C, add 0.65% urea and stir for 20 minutes;

[0024] e. When the temperature is lowered to 60°C, add 34.18% furfur...

Embodiment 2

[0026] Embodiment two: a kind of production technique of furan resin for cast steel, this technique comprises the steps:

[0027] a. Close the discharge valve at the bottom of the kettle, open the feed valve, add 22.2% furfuryl alcohol, start the mixer, add 7% urea, 7.2% paraformaldehyde, close the feed valve, add 1% alkaline catalyst, and the pH value of the seasoning liquid reaches 9 -10;

[0028] b. Open the steam valve, raise the temperature to 95°C within 30-40 minutes, and keep the temperature for 70 minutes;

[0029] c. After the heat preservation is over, turn on the cooling water, lower the temperature to 80°C, add 30% furfuryl alcohol, add 1.1% acid catalyst, and adjust the pH value of the seasoning liquid to 3.7; open the steam valve, heat up to 96°C within 20-30 minutes, and keep warm for 60 minute;

[0030] d. When the temperature drops below 90°C, add 0.8% urea and stir for 20 minutes;

[0031] e. When the temperature is lowered to 60°C, add 24.8% furfuryl alc...

Embodiment 3

[0032] Embodiment three: a kind of production technique of furan resin for cast steel, this technique comprises the steps:

[0033] a. Close the discharge valve at the bottom of the kettle, open the feed valve, add 30% furfuryl alcohol, start the mixer, add 7% urea, 7.2% paraformaldehyde, close the feed valve, add 1% alkaline catalyst, and the pH value of the seasoning liquid reaches 9 -10;

[0034] b. Open the steam valve, raise the temperature to 98°C within 30-40 minutes, and keep the temperature for 70 minutes;

[0035] c. After the heat preservation is over, turn on the cooling water, lower the temperature to 80°C, add 17.5% furfuryl alcohol, add 1% acid catalyst, adjust the pH value of the seasoning liquid to 3.6; open the steam valve, heat up to 96°C within 20-30 minutes, and keep warm for 60 minute;

[0036] d. When the temperature drops below 90°C, add 0.65% urea and stir for 20 minutes;

[0037] e. When the temperature is lowered to 60°C, add 31.68% furfuryl alcoh...

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PUM

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Abstract

The invention relates to a production technology of furan resin, in particular to a production technology of furan resin used for casting steel. The technology comprises the following steps of: closing an outlet valve at the bottom of the reactor, opening a feed valve, starting a mixer, adding certain content of paraformaldehyde, urea and furfuryl alcohol, adding certain content of basic catalyst to adjust the PH value of the seasoning liquid; heating up to 80-100 DEG C, insulating for 60-80 minutes; stopping the insulation, opening cooling water and cooling down to 60-90 DEG C, adding 50% of the total amount of furfuryl alcohol; adding certain amount of acid catalyst to adjust the PH value of the seasoning liquid to 3-5 when the temperature drops to 60 DEG C; heating up to 85-100 DEG C, insulating for 50-70 minutes; adding the 25% of the total amount of furfuryl alcohol, adding certain amount of silane coupling agent ammonia and methanol; and continuing to stir for 30 minutes after discharging and submitting for censorship. The invention provides a method of using imported paraformaldehyde and urea to produce urea-formaldehyde glue on the basis of traditional resin technology instead of using aqueous solution of formaldehyde. The production technology provided by the invention has the advantages of needlessness of dehydration in the post-synthetic phase, production cycle reducing, cost saving and environmental protection.

Description

technical field [0001] The invention relates to a production process of furan resin, in particular to a production process of furan resin for steel casting. Background technique [0002] In recent years, resin no-bake sand technology has been rapidly promoted in my country's foundry industry. The use of furan resin self-setting sand casting process can obtain high-quality castings with smooth surface, clear contours and precise dimensions. The sand can be recycled and reused conveniently, and it can also reduce the cutting amount of casting machining, simplify the molding process, reduce the labor intensity of workers, and save modeling. materials and reduce energy consumption. Therefore, furan resin has been widely used in the entire foundry industry, with an annual consumption of 500,000 tons. In the production process of traditional furan resin, vacuum distillation is used for dehydration. This process not only consumes a lot of heat but also takes a long time, which no...

Claims

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Application Information

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IPC IPC(8): C08G16/02B22C1/22
Inventor 韩文陈学更崔刚马文
Owner GANSU KOCEL CHEM
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