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Production method for quickly curing nitrogen-free furane resin

A rapid curing and production method technology, applied in the production field of rapid curing nitrogen-free furan resin, can solve the problems of high free formaldehyde, low tensile strength, slow hardening speed, etc., achieve good process performance, improve production efficiency, and low free The effect of aldehydes

Active Publication Date: 2013-03-06
共享新材料(山东)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, furan resin for nitrogen-free cast steel has always had the disadvantages of high viscosity, high free formaldehyde, low tensile strength, and slow hardening speed. When applied to single-piece mechanized assembly line production, the hardening speed cannot meet the production requirements of the assembly line, especially in winter in the north. When the temperature is low, it is more difficult to meet the production requirements, resulting in some casting defects

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment one: a kind of production method of fast curing nitrogen-free furan resin, the method comprises the steps:

[0020] a. Melt 5% phenol and put it into the reaction kettle, start the mixer, add 20.3% formaldehyde solution, and use lye to adjust the pH value of the feed solution to 8.8-9.0;

[0021] b. Open the steam valve, raise the temperature to 92-94°C within 40-60 minutes, and keep the temperature for 90 minutes;

[0022] c. At the end of the heat preservation, lower the temperature to 90°C, add 19% furfuryl alcohol, and vacuum dehydrate. The dehydration amount is 70% of the weight of the formaldehyde solution;

[0023] d. After dehydration, add 30% furfuryl alcohol, and use formic acid to adjust the pH value to 4.5-4.8;

[0024] e. Open the steam valve, raise the temperature to 90-92°C within 30-40 minutes, and keep the temperature for 70 minutes;

[0025] f. After the heat preservation is over, cool down to 90°C, add 0.2% modifier, and continue to heat ...

Embodiment 2

[0028] Embodiment two: a kind of production method of fast curing nitrogen-free furan resin, the method comprises the steps:

[0029] a. Melt 10% phenol and put it into the reaction kettle, start the mixer, add 22% formaldehyde solution, and use lye to bring the pH value of the feed solution to 8-8.5;

[0030] b. Open the steam valve, raise the temperature to 88-90°C within 40-60 minutes, and keep the temperature for 70 minutes;

[0031] c. At the end of the heat preservation, lower the temperature to 90°C, add 15% furfuryl alcohol, and vacuum dehydrate. The amount of dehydration is 70% of the weight of the formaldehyde solution;

[0032] d. After dehydration, add 29% furfuryl alcohol and adjust the pH value to 5.0-5.5 with formic acid;

[0033] e. Open the steam valve, raise the temperature to 94-96°C within 30-40 minutes, and keep the temperature for 90 minutes;

[0034] f. At the end of the heat preservation, lower the temperature to 90°C, add 0.3% modifier, and continue ...

Embodiment 3

[0037] Embodiment three: a kind of production method of rapid solidification nitrogen-free furan resin, this method comprises the steps:

[0038] a. Melt 9.3% phenol into the reaction kettle, start the mixer, add 17% formaldehyde solution, and use lye to bring the pH value of the feed solution to 8-8.5;

[0039] b. Open the steam valve, raise the temperature to 88-90°C within 40-60 minutes, and keep the temperature for 70 minutes;

[0040] c. At the end of the heat preservation, lower the temperature to 90°C, add 18.5% furfuryl alcohol, and vacuum dehydrate. The dehydration amount is 70% of the weight of the formaldehyde solution;

[0041] d. After dehydration, add 29.5% furfuryl alcohol, and use formic acid to adjust the pH value to 5.0-5.5;

[0042] e. Open the steam valve, raise the temperature to 94-96°C within 30-40 minutes, and keep the temperature for 90 minutes;

[0043] f. At the end of the heat preservation, lower the temperature to 90°C, add 0.3% modifier, and con...

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Abstract

The invention relates to a production method for nitrogen-free furane resin, in particular to a production method for quickly curing nitrogen-free furane resin. The method is characterized in that: according to the method, phenol is added into a reaction kettle after being dissolved, a blender is started, formaldehyde water solution is added into the reaction kettle, and the pH value of the solution is regulated by alkali liquid; then a steam valve is opened, the temperature rises to 88-96 DEG C, and heat preservation is conducted in a timing way; after the heat preservation, the temperature is decreased to 90 DEG C, 15%-19% of furfuryl alcohol is added into the mixture, and then vacuum dehydration is conducted; 29%-30% of furfuryl alcohol is added into the mixture, and then the pH value is regulated by formic acid; the steam valve is opened to raise the temperature to 88-96 DEG C, and heat preservation is conducted in a timing way for 60-120 minutes; after the heat preservation, the temperature is reduced to 90 DEG C, then modifier is added into the mixture, and heat preservation is continued for 20-30 minutes; and when the temperature is reduced to 70 DEG C, 26%-28% of furfuryl alcohol and coupling agent are added into the mixture, the pH value is regulated by alkali, emptying is conducted after continuing to stirring the mixture for 15 minutes, and then the obtained product is stored in a warehouse. The method of the invention is unique, low in free aldehyde and high in strength, can realize quick curing, and is suitable for small-size and medium-size steel-casting pieces.

Description

technical field [0001] The invention relates to a production method of a nitrogen-free furan resin, in particular to a production method of a fast-curing nitrogen-free furan resin. Background technique [0002] Furan resin has been widely used in my country after nearly 30 years of promotion since the 1970s. However, nitrogen-free cast steel furan resin has always had the disadvantages of high viscosity, high free formaldehyde, low tensile strength, and slow hardening speed. When it is applied to the production of a single mechanized assembly line, the hardening speed cannot meet the production requirements of the assembly line, especially in winter in the north. When the temperature is low, it is more difficult to meet the production requirements, resulting in some casting defects. Contents of the invention [0003] The purpose of the present invention is to overcome the deficiencies of the prior art, to provide a unique method, which can realize rapid hardening, low fre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G16/04
Inventor 靳毅何龙杨洋韩文
Owner 共享新材料(山东)有限公司