Bio-based waterborne polyurethanes reinforced with cellulose nanocrystals as coating films

Hormaiztegui, M. E. Victoria; Daga, Bernardo; Aranguren, Mirta I.; Mucci, Verónica Luján

doi:10.1016/j.porgcoat.2020.105649

Cited by 45 publications

(23 citation statements)

References 61 publications

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“…Nanocellulose reinforcement makes WBPU nanocomposites ideal for ‘green’ coating materials. Most of the previous research has been done using CNF as a filler and it has been reported that it increases the strength of the composite film and shifts the temperature of degradation to a higher temperature [ 19 , 20 , 21 , 22 , 23 ]. However, the hydrophilicity characteristics of the cellulosic material may have an impact on the composite material as it may attract moisture/water to be absorbed [ 24 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Cellulose Nanofibrils on the Properties of Jatropha Oil-Based Waterborne Polyurethane Nanocomposite Film

et al. 2021

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The objective of this work was to study the influence of cellulose nanofibrils (CNF) on the physical, mechanical, and thermal properties of Jatropha oil-based waterborne polyurethane (WBPU) nanocomposite films. The polyol to produce polyurethane was synthesized from crude Jatropha oil through epoxidation and ring-opening method. The chain extender, 1,6-hexanediol, was used to improve film elasticity by 0.1, 0.25, and 0.5 wt.% of CNF loading was incorporated to enhance film performance. Mechanical performance was studied using a universal test machine as specified in ASTM D638-03 Type V and was achieved by 0.18 MPa at 0.5 wt.% of CNF. Thermal gravimetric analysis (TGA) was performed to measure the temperature of degradation and the chemical crosslinking and film morphology were studied using Fourier-transform infrared spectroscopy (FTIR) and field emission scanning electron microscopy (FESEM). The results showed that when the CNF was incorporated, it was found to enhance the nanocomposite film, in particular its mechanical and thermal properties supported by morphology. Nanocomposite film with 0.5 wt.% of CNF showed the highest improvement in terms of tensile strength, Young’s modulus, and thermal degradation. Although the contact angle decreases as the CNF content increases, the effect on the water absorption of the film was found to be relatively small (<3.5%). The difference between the neat WPBU and the highest CNF loading film was not more than 1%, even after 5 days of being immersed in water.

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Section: Introductionmentioning

confidence: 99%

Effect of Cellulose Nanofibrils on the Properties of Jatropha Oil-Based Waterborne Polyurethane Nanocomposite Film

et al. 2021

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“…In producing polyurethane, polyol and diisocyanate are the main ingredients. Vegetable oils have emerged as a green alternative source for the polyols or the precursors to the synthesis of this component, due to their availability, low eco-toxicity, relatively low cost and biodegradability [ 6 ]. Several vegetable oils have been used to synthesize bio-based polyols, such as cottonseed oil, soybean oil, castor oil, sunflower oil, canola oil, corn oil, palm oil, rapeseed oil, jatropha oil and tung oil, among others [ 7 , 8 , 9 ].…”

Section: Introductionmentioning

confidence: 99%

Chemical and Thermo-Mechanical Properties of Waterborne Polyurethane Dispersion Derived from Jatropha Oil

et al. 2021

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Nowadays, there is a significant trend away from solvent-based polyurethane systems towards waterborne polyurethane dispersions due to government regulations requiring manufacturers to lower total volatile organic compounds, as well as consumer preference for more environmentally friendly products. In this work, a renewable vegetable oil-based polyol derived from jatropha oil was polymerized with isophorone diisocyanate and dimethylol propionic acid to produce anionic waterborne polyurethane dispersion. Free standing films with up to 62 wt.% bio-based content were successfully produced after evaporation of water from the jatropha oil-based waterborne polyurethane (JPU) dispersion, which indicated good film formation. The chemical and thermo-mechanical properties of the JPU films were characterized. By increasing the OH numbers of polyol from 161 mgKOH/g to 217 mgKOH/g, the crosslinking density of the JPU was significantly increased, which lead to a better storage modulus and improved hydrophobicity. Overall, JPU produced from polyol having OH number of 217 mgKOH/g appears to be a promising product for application as a binder for wood and decorative coatings.

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“…Polyurethanes in aqueous dispersion are available on the market [18], but the main obstacle to their use in artificial leather coating processes is their high stability, so that the normal coagulants, used for other types of dispersion, did not allow obtaining the desired result in the desired time. To overcome these issues, it was necessary to perform the following preliminary steps: a) Selection of a category of polyurethane that allows an aqueous dispersion according to the physical characteristics of resilience, elasticity, rigidity, flexibility, transparency, colour and elongation at break.…”

Section: Coating Processmentioning

confidence: 99%

Development of a process based on coagulation of polyurethane in aqueous solution for manu-facturing leather-like products

Furferi¹,

Sabattini²

2021

Manufacturing Technology

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Multilayer synthetic leather-like textiles are traditionally manufactured by using dimethylformamide as a diluent via polymeric polyurethane coating and coagulation processes. Unfortunately, this process has a strong environ-mental impact since it encompass a complex and polluting grinding process to separate dimethylformamide from water. Furthermore, this compound was proved harmful for both environment and textile practitioners' health. The aim of this work is to improve the state of the art in the production of leather-like fabrics through the devel-opment of an innovative process of coagulation of polyurethane in aqueous solution to replace the current highly polluting process that involves the use of dimethylformamide. The coagulation is obtained by means of an IR thermal fixing thus resulting in a completely eco compatible manufacturing process. The obtained quality of the manufactured synthetic leather, tested according to textile standards, is comparable to the one obtained by means of conventional processes.

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Bio-based waterborne polyurethanes reinforced with cellulose nanocrystals as coating films

Cited by 45 publications

References 61 publications

Effect of Cellulose Nanofibrils on the Properties of Jatropha Oil-Based Waterborne Polyurethane Nanocomposite Film

Effect of Cellulose Nanofibrils on the Properties of Jatropha Oil-Based Waterborne Polyurethane Nanocomposite Film

Chemical and Thermo-Mechanical Properties of Waterborne Polyurethane Dispersion Derived from Jatropha Oil

Development of a process based on coagulation of polyurethane in aqueous solution for manu-facturing leather-like products

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