Synthesis And Properties Of Straw Waste/polystyrene Wood-plastic Beads

Straw resources are large and broad in scope.If they are used,they are profitable.If they are discarded,they are wasted.Straw waste is a kind of natural polymer material similar to wood,which can replace wood,reduce wood consumption and play an important role in forest protection and greening.Rice straw powder has the yellowish color of natural straw,which can be used as filler and added into polymer to prepare wood-plastic composites,while maintaining the natural color of rice straw powder.Rice husk powder is rich in Si O₂,which can be used as reinforcing agent to increase the mechanical properties of polymers.Rice husk carbon contains a lot of Si O₂and can not only be used as black pigment,but also improve polymer mechanical properties and conductivity.In this paper,three different types of straw biomass waste（rice powder,rice husk and rice husk carbon）were used as raw materials to study simple,industrializable and hydrophobic modification of straw waste.Different functional straw powder/polystyrene woody beads were synthesized by one-step in situ suspension polymerization.In this paper,the surface nano-functional and in situ hydrophobic modification of straw waste was carried out by in situ chemical precipitation.The nano-magnesium hydroxide flame retardant was grown in situ on the surface of straw waste,and the green modifier oleic acid was added directly to the surface hydrophobic and one-step hydrophobic magnesium hydroxide nano-functional straw powder was prepared.The effect of adding amount of straw powder and amount of oleic acid on hydrophobicity of functional straw powder was investigated.Functional straw powder was characterized by infrared spectroscopy,X-ray diffraction,contact angle test,scanning electron microscope and thermogravimetric analysis.The results of contact angle and light permeability test showed that functional straw powder was hydrophobic and improved the interface compatibility between straw powder and polymer matrix.Infrared spectroscopy,X-ray diffraction and scanning electron microscopy showed that the nanometer magnesium hydroxide flame retardant was successfully grown on the surface of straw powder.Thermal weightlessness analysis shows that the heat resistance of straw powder with nanometer magnesium hydroxide flame retardant can be improved.Functional straw powder/polystyrene xyloprene beads were successfully synthesized for the first time by one-step in situ suspension polymerization.A series of colored polystyrene wood-plastic beads of different colors and sizes can be obtained by adjusting the amount of functional straw powder.Functional straw powder/polystyrene wood-plastic beads were characterized by infrared spectroscopy,scanning electron microscopy and thermogravimetric analysis.The influence of addition,agitation rate and surfactant on particle size and particle size distribution of functional straw powder/polystyrene wood-plastic beads was investigated.The controlled synthesis of functional straw waste/polystyrene wood-plastic beads was achieved by optimizing process parameters.The average grain diameter of wood-plastic beads varied little,but the grain diameter distribution was wider.With the increase of agitation rate,the average particle size of wood-plastic beads decreases gradually.The larger the amount of surfactant,the smaller the average particle size of wood-plastic beads and the wider the particle size distribution.