Abstract
Due to long-term problems related to environmental protection, economic aspects, and waste management in the chemical industry, it is justified to develop renewable polymers as an alternative to synthetic polymers. Two kinds of acrylic bio-renewable components were used for the modification of acrylated epoxidized soybean oil (AESO). The bio-based compositions used as photocurable binders to obtain the photocurable coatings with satisfactory properties and high bio content were then prepared. The kinetic of curing reaction of the oligomers and monomers towards radical photopolymerization and the properties of the cured coatings were fully investigated; the results are discussed in relation with the compounds’ structures. Important information about how to design and obtain renewable photocurable coatings with satisfactory properties was provided in this study. In this study, AESO resin was modified with renewable oligomer or (math)acrylate monomer to increase the reactivity and reduce the viscosity of the photoreactive system in order to obtain renewable and viable alternatives to petroleum-based polymeric materials with perfect film-forming properties. It turned out that both photopolymerization rate and hardness of cured coatings were increased significantly with the addition of modifiers; the use of a thiol modifier and change of the photoinitiator concentration allowed to improve the adhesion, hardness, and control of the photo-curing process.
Highlights
The use of UV technology for curing polymers is a fast way to change liquid, reactive materials into solid materials with good properties, for applications such as coatings, adhesives, inks, and dental materials [1,2,3]
Natural resources such as vegetable oils, fatty acids, or lactic acids have been found to be widely attractive for scientists because they can be molecular-engineered into renewable polymers in a way similar to many petroleum chemicals
The following raw materials were used for the studies: epoxidized soybean oil acrylate resin (Ebecryl 5848; 62% biorenewable content, acrylated epoxidized soybean oil (AESO)) and bio-based diacrylate oligomer (Ebecryl 5850; 56% biorenewable content; BioDA) were provided from Allnex Resins, Germany GmbH and used without purification; isobornyl methacrylate (Sarbio 6105; 70%; BioMA) was purchased from Arkema; mercapto-modified polyester acrylate resin (Ebecryl LED 02; T) was purchased from Allnex Resins, Germany GmbH; and (2,4,6trimethylbenzoyl)diphenylphosphine oxide used as photoinitiator (Omnirad TPO-L; PI)
Summary
The use of UV technology for curing polymers is a fast way to change liquid, reactive materials into solid materials with good properties, for applications such as coatings, adhesives, inks, and dental materials [1,2,3]. Polymers obtained from renewable raw materials are already applied in packaging, electronics, biomedical and hygiene products, cosmetics, agriculture, other consumer goods, and have even been tried in optical 3D printing [11,12,13,14]. Natural resources such as vegetable oils, fatty acids, or lactic acids have been found to be widely attractive for scientists because they can be molecular-engineered into renewable polymers in a way similar to many petroleum chemicals. Both the fatty unsaturation peroxide oxidation and acrylic acid ring open epoxy process lead to acrylated or epoxidized plant oils for free radical or cationic UV curable materials [19,20,21,22]
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