Curing mechanism of alkaline phenolic resin with organic ester

To study the curing mechanism of alkaline phenolic resin with organic ester, three esters were chosen to react with three systems — alkaline phenolic resin, potassium hydroxide aqueous solution containing phenol, and potassium hydroxide aqueous solution. The variations of pH, heat release and gel pH...

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Main Authors: Huang Renhe, Wang Yanmin, Zhang Baoping
Format: Article
Language:English
Published: Foundry Journal Agency 2014-09-01
Series:China Foundry
Subjects:
Online Access:http://foundryworld.com/uploadfile/2014103152316821.pdf
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author Huang Renhe
Wang Yanmin
Zhang Baoping
author_facet Huang Renhe
Wang Yanmin
Zhang Baoping
author_sort Huang Renhe
collection DOAJ
description To study the curing mechanism of alkaline phenolic resin with organic ester, three esters were chosen to react with three systems — alkaline phenolic resin, potassium hydroxide aqueous solution containing phenol, and potassium hydroxide aqueous solution. The variations of pH, heat release and gel pH during the reactions were monitored and measured. Infrared spectroscopy (IR) and thermal gravity analysis (TG) techniques were used to characterize the curing reaction. It was found that organic ester is only partially hydrolyzed and resin can be cured through organic ester hydrolysis process as well as the reaction with redundant organic ester. The sequential curing mechanism of alkaline phenolic resin cured by organic ester was identified as follows: a portion of organic ester is firstly hydrolyzed owing to the effect of the strong alkaline; the gel is then formed after the pH decreases to about 10.8-10.88, meanwhile, the redundant organic ester (i.e. non-hydrolysis ester) starts the curing reaction with the resin. It has also been found that the curing rate depends on the hydrolysis velocity of organic ester. The faster the hydrolysis speed of the ester, the faster the curing rate of the resin.
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spelling doaj.art-9a9630f86fbd458a8fafe1f88159af1c2022-12-21T17:42:46ZengFoundry Journal AgencyChina Foundry1672-64211672-64212014-09-01115447451Curing mechanism of alkaline phenolic resin with organic esterHuang Renhe0Wang Yanmin1Zhang Baoping2 School of Chemical and Environmental Engineering, Shandong University of Science and Technology, Qingdao 265590, Shandong, ChinaSchool of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao 265590, Shandong, China School of Chemical and Environmental Engineering, Shandong University of Science and Technology, Qingdao 265590, Shandong, ChinaTo study the curing mechanism of alkaline phenolic resin with organic ester, three esters were chosen to react with three systems — alkaline phenolic resin, potassium hydroxide aqueous solution containing phenol, and potassium hydroxide aqueous solution. The variations of pH, heat release and gel pH during the reactions were monitored and measured. Infrared spectroscopy (IR) and thermal gravity analysis (TG) techniques were used to characterize the curing reaction. It was found that organic ester is only partially hydrolyzed and resin can be cured through organic ester hydrolysis process as well as the reaction with redundant organic ester. The sequential curing mechanism of alkaline phenolic resin cured by organic ester was identified as follows: a portion of organic ester is firstly hydrolyzed owing to the effect of the strong alkaline; the gel is then formed after the pH decreases to about 10.8-10.88, meanwhile, the redundant organic ester (i.e. non-hydrolysis ester) starts the curing reaction with the resin. It has also been found that the curing rate depends on the hydrolysis velocity of organic ester. The faster the hydrolysis speed of the ester, the faster the curing rate of the resin.http://foundryworld.com/uploadfile/2014103152316821.pdforganic ester; alkaline phenolic resin; curing process; gel; curing mechanism
spellingShingle Huang Renhe
Wang Yanmin
Zhang Baoping
Curing mechanism of alkaline phenolic resin with organic ester
China Foundry
organic ester; alkaline phenolic resin; curing process; gel; curing mechanism
title Curing mechanism of alkaline phenolic resin with organic ester
title_full Curing mechanism of alkaline phenolic resin with organic ester
title_fullStr Curing mechanism of alkaline phenolic resin with organic ester
title_full_unstemmed Curing mechanism of alkaline phenolic resin with organic ester
title_short Curing mechanism of alkaline phenolic resin with organic ester
title_sort curing mechanism of alkaline phenolic resin with organic ester
topic organic ester; alkaline phenolic resin; curing process; gel; curing mechanism
url http://foundryworld.com/uploadfile/2014103152316821.pdf
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AT wangyanmin curingmechanismofalkalinephenolicresinwithorganicester
AT zhangbaoping curingmechanismofalkalinephenolicresinwithorganicester