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. 2022 Jan 11;14(2):284.
doi: 10.3390/polym14020284.

Sustainable Reactive Polyurethane Hot Melt Adhesives Based on Vegetable Polyols for Footwear Industry

Maria Pilar Carbonell Blasco  1 , María Ángeles Pérez Limiñana  1 , Carlos Ruzafa Silvestre  1 , Elena Orgilés Calpena  1 , Francisca Arán Aís  1
Affiliations

Sustainable Reactive Polyurethane Hot Melt Adhesives Based on Vegetable Polyols for Footwear Industry

Maria Pilar Carbonell Blasco et al. Polymers (Basel). .

Abstract

The aim of this work is to develop sustainable reactive polyurethane hot melt adhesives (HMPUR) for footwear applications based on biobased polyols as renewable resources, where ma-croglycol mixtures of polyadipate of 1,4-butanediol, polypropylene and different biobased polyols were employed and further reacted with 4-4'-diphenylmethane diisocyanate. The different reactive polyurethane hot melt adhesives obtained were characterized with different experimental techniques, such as Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), softening temperature and melting viscosity. Finally, their adhesion properties were measured from T-peel tests on leather/HMPUR adhesives/SBR rubber joints in order to establish the viability of the used biobased polyols and the amount of these polyols that could be added to reactive polyurethane hot melt adhesives satisfactorily to meet the quality requirements of footwear joints. All biobased polyols and percentages added to the polyurethane adhesive formulations successfully met the quality requirements of footwear, being comparable to traditional adhesives currently used in footwear joints in terms of final strength. Therefore, these new sustainable polyurethane adhesives can be considered as suitable and sustainable alternatives to the adhesives commonly used in footwear joints.

Keywords: biobased matrix; biobased polymers; circular economy; natural feedstock.

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Conflict of interest statement

The authors declare no conflict in interest.

Figures

Figure 1
Figure 1
Scheme of the synthesis of the reactive polyurethane hot melt adhesives.
Figure 2
Figure 2
FTIR spectra of the HMPUR adhesives based on different biobased polyols (T1, T2 and T3, respectively), and different content of biobased polyols.
Figure 3
Figure 3
DSC thermograms of the HMPUR adhesives with different biobased polyols (T1, T2 and T3, respectively), and different content of biobased polyols. Second heating run.
Figure 4
Figure 4
TG and DTA curves of the HMPUR with different biobased polyols, T1 (a,b), T2 (c,d) and T3 (e,f), respectively, and different content of biobased polyols.
Figure 4
Figure 4
TG and DTA curves of the HMPUR with different biobased polyols, T1 (a,b), T2 (c,d) and T3 (e,f), respectively, and different content of biobased polyols.
Figure 5
Figure 5
T-peel strength values of leather/biobased HMPUR adhesive/SBR joints after 5 min (a) and 72 h (b–d). Locus failure: C: cohesive failure in the adhesive, with threads; M2: rubber cohesive failure; A2: adhesive failure to the SBR2 rubber.
Figure 5
Figure 5
T-peel strength values of leather/biobased HMPUR adhesive/SBR joints after 5 min (a) and 72 h (b–d). Locus failure: C: cohesive failure in the adhesive, with threads; M2: rubber cohesive failure; A2: adhesive failure to the SBR2 rubber.
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References

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