COMPOSIT MATERIALS BASED ON AGRICULTURAL AND 5-HYDROXYMETHYLFURFUROL PRODUCTION WASTES AND POLYETHYLENE

The composite materials based on secondary polyethylene and agricultural wastes (straw of various types) as filler were developed. The prospects of modifying the surface of the filler with resinous waste from the production of 5- hydroxymethylfurfural (5-HMF) from a vegetable source were shown, which is a versatile platform for obtaining valuable chemical products, including monomers for the production of polymers from renewable raw materials. At present, 5-HMF is produced quite successfully from various plant raw materials (sugar beet, Jerusalem artichoke, laminaria, etc.) However, the production of 5-HMF by acid catalyzed dehydration of polysaccharides is accompanied up to 10% of by-product resinous humic-like substances (hereinafter called the resin) formation. The ways of its utilization have of great practical interest. The presence of oligomeric chains with a large number of polar groups in the resin composition ensures its uniform distribution over the surface of hydrophilic filler particles, forming a polymer film, which significantly reduces the water absorption of the composite. Present research shows that as the content of the resin increases from 0% to 4%, the water absorption of composites containing 15 % of rice or wheat straw decreases by 3-5 times. On the other hand, the hydrophobic fragments of the oligomeric resin chains interact with the polyethylene matrix. As a result, the adhesion between the straw particles and the polyethylene increase, and the strength properties of the resulting composite materials increase too. The optimal ratio of components is 15% wheat straw, the ratio of straw / resin is 8-15%, 0.5-2% modifier. It should be noted that improvements in the properties of composite materials have been achieved by introduction of relatively small amounts of a modifier (0.5-2%). The resulting composites can be used as construction and waterproof materials.

composite materials, secondary polyethylene, straw, 5-hydroxymethylfurfural

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