Environmentally-compatible alkyd paints stabilized by wood hemicelluloses

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http://hdl.handle.net/10138/302031

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Mikkonen , K S , Kirjoranta , S , Xu , C , Hemming , J , Pranovich , A , Bhattarai , M , Peltonen , L , Kilpeläinen , P , Maina , N , Tenkanen , M , Lehtonen , M & Willför , S 2019 , ' Environmentally-compatible alkyd paints stabilized by wood hemicelluloses ' , Industrial Crops and Products , vol. 133 , pp. 212-220 . https://doi.org/10.1016/j.indcrop.2019.03.017

Title: Environmentally-compatible alkyd paints stabilized by wood hemicelluloses
Author: Mikkonen, Kirsi S.; Kirjoranta, Satu; Xu, Chunlin; Hemming, Jarl; Pranovich, Andrey; Bhattarai, Mamata; Peltonen, Leena; Kilpeläinen, Petri; Maina, Ndegwa; Tenkanen, Maija; Lehtonen, Mari; Willför, Stefan
Contributor: University of Helsinki, Helsinki Institute of Sustainability Science (HELSUS)
University of Helsinki, Department of Food and Nutrition
University of Helsinki, Department of Food and Nutrition
University of Helsinki, Drug Research Program
University of Helsinki, Staff Services
University of Helsinki, Department of Food and Nutrition
University of Helsinki, Food Materials Science Research Group
Date: 2019-07
Language: eng
Number of pages: 9
Belongs to series: Industrial Crops and Products
ISSN: 0926-6690
URI: http://hdl.handle.net/10138/302031
Abstract: Wood biorefining currently involves large-scale industrial processes where a notable portion of raw materials, namely hemicelluloses and lignin, are either lost with the process water, degraded, or burnt for energy. Value added utilization of polymeric hemicelluloses is challenging due to their intermediate molar mass and the presence of other wood components, such as phenolic residues or wood extractives. Oil-in-water (O/W) emulsions represent a diverse and abundant class of applications in which the natural properties of wood hemicelluloses are beneficial. In the current work, we present highly promising new technical alkyd paint emulsion systems stabilized with hardwood glucuronoxylans (GX) and softwood galactoglucomannans (GGM). Samples from three isolation methods and their further fractionation by ethanol precipitation were systematically compared with regard to hemicellulose composition, interfacial activity, and functionality in emulsions. Emulsification of alkyd resins was successful with both GX and GGM obtained by various biorefining strategies. The highest emulsion stability over storage was achieved using crude non-purified GX and GGM fractions, and was correlated with the presence of phenolic compounds and extractives, interfacial activity, and small droplet size. Hardwood GX and softwood GGM are envisioned as natural emulsifiers of alkyd O/W emulsions, which are examples of diverse and abundantly-used technical dispersions. This study can be utilized as a guideline for targeted extraction of hemicelluloses with desired functionality, and as a protocol for developing environmentally-compatible industrial dispersions.
Subject: 415 Other agricultural sciences
Emulsions
Alkyds
Paints
Hemicelluloses
Glucuronoxylans
Galactoglucomannans
HOT-WATER EXTRACTION
SPRUCE GALACTOGLUCOMANNANS
EMULSIFICATION
VISCOSITY
PULP
FLOW
Emulsions
Alkyds
Paints
Hemicelluloses
Glucuronoxylans
Galactoglucomannans
HOT-WATER EXTRACTION
SPRUCE GALACTOGLUCOMANNANS
EMULSIFICATION
VISCOSITY
PULP
FLOW
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