Synthesis and characterisation of waterborne polyurethane adhesive from hydroxyl terminated natural rubber

Rungvichaniwat A., . and Klinpituksa P., . and Pilard J. F., . and Campistron I., . and Kaenhin L., . and Laguerre A., . and Saetung A., . Synthesis and characterisation of waterborne polyurethane adhesive from hydroxyl terminated natural rubber. pp. 217-229. ISSN 1511-1768

Waterborne polyurethane adhesives (WPUAs) were synthesised by an isocyanate terminated polyurethane prepolymer process using 2 2-bis (hydroxymethyl) propionic acid (DMPA) as an internal emulsifier and chain extension by 1 4-diaminobutane. The different characteristic polyols such as hydroxyl terminated natural rubber (HT) with various number average molecular weights (Mn) at 600 (HT600) and 1000 g/mol (HT1000) and epoxidised HT (eHT) with 10 (10eHT) and 37 (37eHT) percentages of epoxidation were synthesised from natural rubber latex (NRL) for preparing the WPUA. Fourier transform infrared spectroscopy (FTIR) and proton nuclear magnetic resonance spectroscopy (1H-NMR) techniques were used to characterise the chemical structures. The pH value mean particle size viscosity glass transition temperature (Tg) T-peel strength and lap shear strength of the WPUAs were measured. The WPUAs had pH values of about 7.80 to 8.50. The mean particle size of the WPUAs depended on the DMPA content. At higher DMPA content a smaller mean particle size was obtained. The Tg of WPUAs exhibited the same trend values of HT and eHT. T-peel strength and lap shear strength of adhesives were measured by bonding of leather to leather. It was found that WPUA600 and WPUA1000 showed good adhesion. Thus HT and eHT prepared from NRL can be used to prepare WPUA for the footwear industry.

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Abstract

Waterborne polyurethane adhesives (WPUAs) were synthesised by an isocyanate terminated polyurethane prepolymer process using 2 2-bis (hydroxymethyl) propionic acid (DMPA) as an internal emulsifier and chain extension by 1 4-diaminobutane. The different characteristic polyols such as hydroxyl terminated natural rubber (HT) with various number average molecular weights (Mn) at 600 (HT600) and 1000 g/mol (HT1000) and epoxidised HT (eHT) with 10 (10eHT) and 37 (37eHT) percentages of epoxidation were synthesised from natural rubber latex (NRL) for preparing the WPUA. Fourier transform infrared spectroscopy (FTIR) and proton nuclear magnetic resonance spectroscopy (1H-NMR) techniques were used to characterise the chemical structures. The pH value mean particle size viscosity glass transition temperature (Tg) T-peel strength and lap shear strength of the WPUAs were measured. The WPUAs had pH values of about 7.80 to 8.50. The mean particle size of the WPUAs depended on the DMPA content. At higher DMPA content a smaller mean particle size was obtained. The Tg of WPUAs exhibited the same trend values of HT and eHT. T-peel strength and lap shear strength of adhesives were measured by bonding of leather to leather. It was found that WPUA600 and WPUA1000 showed good adhesion. Thus HT and eHT prepared from NRL can be used to prepare WPUA for the footwear industry.

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Item Type:	Article
AGROVOC Term:	Hydroxylation
AGROVOC Term:	Natural rubber
AGROVOC Term:	Polyurethane
AGROVOC Term:	Polymers
AGROVOC Term:	Chemical synthesis
AGROVOC Term:	Elastomers
Geographical Term:	Malaysia
Depositing User:	Ms. Suzila Mohamad Kasim
Last Modified:	28 Apr 2025 02:31
URI:	http://webagris.upm.edu.my/id/eprint/23000

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