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Wetting and film formation of wheat gluten dispersions applied to wood substrates as particle board adhesives
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology, Coating Technology. Casco Adhes AB, AkzoNobel, SE-10061 Stockholm, Sweden.
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2015 (English)In: European Polymer Journal, ISSN 0014-3057, E-ISSN 1873-1945, Vol. 67, 476-482 p.Article in journal (Refereed) Published
Abstract [en]

The wetting, penetration, and film formation of wheat gluten dispersions on porous wood substrates have been studied using different microscopy techniques. The effect variation of wheat gluten concentration, processing temperatures, dispersion composition, and the application scheme has been studied. The results have been correlated to previously obtained results on the function of wheat gluten dispersions as adhesive binders for particle boards. The results show that the dispersions readily penetrate the porous wood substrate and that the key parameters for a successful gluing are the dispersion viscosity, concentration, and the application scheme.

Place, publisher, year, edition, pages
2015. Vol. 67, 476-482 p.
Keyword [en]
Adhesives, Wheat gluten, Plant protein, Film formation, Microscopy
National Category
Polymer Technologies
URN: urn:nbn:se:kth:diva-171904DOI: 10.1016/j.eurpolymj.2014.11.034ISI: 000357750900045OAI: diva2:845473

QC 20150812

Available from: 2015-08-12 Created: 2015-08-10 Last updated: 2015-12-09Bibliographically approved
In thesis
1. Protein-Based Adhesives for Particleboards
Open this publication in new window or tab >>Protein-Based Adhesives for Particleboards
2016 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The main objective of this study was to elucidate the possibilities to use wheat gluten (WG) as a binder for particleboards, as well as soy protein isolate (SPI). The focus was on the effect of the adhesive formulation and the processing conditions, while the press parameters were kept constant. Some aspects of the dispersion and the preparation of the dispersions that were investigated are: the dispersing agent (sodium hydroxide 0.1 M or citric acid 0.05 M), the time (1, 3 or 5h) to prepare the dispersion, the temperature (room temperature, 50 or 80°C) during the preparation of the dispersions and the effect of storing (1, 2.5 or 4 days) the dispersions before application. Additionally, utilization of cross-linker polyamidoamine-epichlorohydrin (PAAE) and trimethylolpropane triacetoacetate (AATMP) were evaluated. Furthermore, the utilization of green particles versus dried particles was examined. The concentration (12, 16, 20 or 24%) of WG dispersion and the process for applying it to the particles were studied. Two application methods were evaluated, in application method 1 (appl. 1) all the dispersion was added to the particles in one step before the particles were dried. When application method 2 (appl. 2) was employed the dispersion was added in two steps, some of the dispersion was added before the drying and some after the drying. The considered board properties were internal bond (IB), thickness swelling (TS) and water absorption (ABS). The wetting, penetration and film formation of the WG dispersions on the wood was investigated employing different microscopy techniques. For the WG dispersions it looks as if a lower temperature is preferable for the preparation of the dispersion and that the time to prepare the dispersion is of no importance. Furthermore, storing the dispersions for more than one day before it was used as an adhesive for particleboards (PB) resulted in poorer boards. Using the right cross-linker, such as PAAE enhances the binding abilities of WG. According to this study it is beneficial to use dried particles instead of green particles. Additionally, the results show that the interaction between the concentration of WG dispersion and how it is applied is a significant factor, considering the IB value. However, in general the two step process (appl. 2) is preferable. The microscopy study reveals that this can be explained by the balance between wetting, penetration, and flow of the dispersion on the wood. The two step application results in less over-penetration when the viscosity of the dispersion is low.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2016. 64 p.
TRITA-CHE-Report, ISSN 1654-1081 ; 2016:2
National Category
Other Chemistry Topics
Research subject
urn:nbn:se:kth:diva-178939 (URN)978-91-7595-792-0 (ISBN)
Public defence
2016-01-15, K1, Teknikringen 56, KTH, Stockholm, 10:00 (English)

QC 20151209

Available from: 2015-12-09 Created: 2015-12-09 Last updated: 2015-12-09Bibliographically approved

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