Modified urea-formaldehyde furan resin

A technology of urea-formaldehyde furan resin and urea-formaldehyde furan, which is applied in the field of organic synthetic resins and can solve problems such as poor environmental performance, pungent odor, and high toxicity

Inactive Publication Date: 2018-11-02
GANSU KOCEL CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The existing technology lacks a fundamental and complete solution to the problems of common urea-formaldehyde furan resins such as high toxicity, pungent odor, and poor environmental performance.

Method used

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  • Modified urea-formaldehyde furan resin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Citral 18%, urea 5%, furfuryl alcohol 73%, sodium hydroxide 0.3%, hydrochloric acid 0.21%, methanol 3.29%, silane 0.2%.

[0030] Ⅰ. Add 900kg citral and 250kg urea into the reaction kettle, start stirring and add 700kg furfuryl alcohol, then slowly add sodium hydroxide, slowly heat up to 80-100°C and then reflux for 70-80min.

[0031] Ⅱ. Add 300kg of furfuryl alcohol and lower the temperature to 75-80°C for vacuum dehydration, then add 1850kg of furfuryl alcohol, slowly add hydrochloric acid, heat up to 80-100°C and reflux for 80-90min.

[0032] Ⅲ. Cool down and add 800kg of furfuryl alcohol, 164.5kg of methanol, and 10kg of silane, stir for 30min, add sodium hydroxide to adjust the pH value to neutral. After cooling to room temperature, discharge.

Embodiment 2

[0034] Citral 18%, urea 6%, furfuryl alcohol 70%, sodium hydroxide 0.32%, hydrochloric acid 0.25%, methanol 5.18%, silane 0.25%.

[0035] Ⅰ. Add 900kg citral and 300kg urea into the reaction kettle, start stirring and add 700kg furfuryl alcohol, then slowly add sodium hydroxide, slowly heat up to 80-100°C and then reflux for 70-80min.

[0036] Ⅱ. Add 300kg of furfuryl alcohol and lower the temperature to 75-80°C and vacuum dehydrate, then add 1700kg of furfuryl alcohol, slowly add hydrochloric acid, heat up to 80-100°C and reflux for 80-90min.

[0037] Ⅲ. Cool down and add 800kg of furfuryl alcohol, 259kg of methanol, and 12.5kg of silane, stir for 30min, add sodium hydroxide to adjust the pH value to neutral. After cooling to room temperature, discharge.

Embodiment 3

[0039] Citral 21%, urea 8%, furfuryl alcohol 67%, sodium hydroxide 0.35%, hydrochloric acid 0.45%, methanol 3.0%, silane 0.2%.

[0040] Ⅰ. Add 1050kg citral and 400kg urea into the reaction kettle, start stirring and add 700kg furfuryl alcohol, then slowly add sodium hydroxide, slowly raise the temperature to 80-100°C and then reflux for 70-80min.

[0041] Ⅱ. Add 300kg of furfuryl alcohol and lower the temperature to 75-80°C for vacuum dehydration, then add 1550kg of furfuryl alcohol, slowly add hydrochloric acid, heat up to 80-100°C and reflux for 80-90min.

[0042] Ⅲ. Cool down and add 800kg of furfuryl alcohol, 150kg of methanol and 10kg of silane, stir for 30min, add sodium hydroxide to adjust the pH value to neutral. After cooling to room temperature, discharge.

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Abstract

The invention discloses modified urea-formaldehyde furan resin. The modified urea-formaldehyde furan resin is characterized by comprising main components as follows: aldehyde, urea and furfuralcohol,wherein aldehyde is non-toxic plant aldehyde compounds; the non-toxic plant aldehyde compounds are selected from at least one of geranialdehyde, geranial, citronellal, cinnamyl aldehyde and neral, andare preferably selected from geranialdehyde. The furan resin, especially the urea-formaldehyde modified furan resin, is widely applied to casting production. The problems that common urea-formaldehyde furan resin is highly toxic and has pungent smell and poor environmental protection property and the like in the prior art are solved fundamentally and completely. According to the embodiment of theinvention, the urea-formaldehyde furan resin modified with geranialdehyde instead of formaldehyde has the performance index equivalent to that of the common urea-formaldehyde furan resin, both an aldehyde structure and an olefin structure are contained in the structure, resinification reaction is facilitated, so that compared with the common urea-formaldehyde furan resin, the modified urea-formaldehyde furan resin is non-toxic, green and environmentally friendly, and formaldehyde volatilization and pungent smell production are avoided in a casting process.

Description

technical field [0001] The invention relates to the field of organic synthetic resins, in particular to a production method and a specific use method of a modified urea-formaldehyde furan resin. Background technique [0002] In recent years, furan resin has been widely used in casting production, especially urea-formaldehyde modified furan resin, which has low viscosity, high strength, strong acid resistance, strong alkali resistance, high temperature resistance, good collapsibility, and simple synthesis process. The advantages have been widely valued by the foundry industry all over the world, and the furan resin no-bake sand process has self-hardening at room temperature, low energy consumption, high production efficiency, high recovery rate of old sand, high dimensional accuracy of the produced castings, and good surface quality of the castings, etc. Advantages, so furan resin has become the most widely used casting resin in my country. However, with the rapid development ...

Claims

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Application Information

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IPC IPC(8): C08G16/04
CPCC08G16/04
Inventor 周利军韩文马文张茜
Owner GANSU KOCEL CHEM
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