Polyolefin/polystyrene blend-based wood plastic composite material and preparation method thereof

Abstract

The invention belongs to the field of wood-plastic composite materials, and relates to a polyolefin / polystyrene blend-based wood plastic composite material and a preparation method thereof. The preparation method of the polyolefin / polystyrene blend-based wood plastic composite material comprises the following steps: dissolving an initiator and maleic anhydride in acetone for preparing a solution, uniformly mixing the solution with the polyolefin / polystyrene blend, storing in an open manner for completely volatilizing the solvent; adding wood fiber, the stearic acid and the styrene into a high-speed mixer, uniformly mixing, adding the mixed plastic mixture, and uniformly mixing; and adding the mixed materials into a double-screw extruder, and extruding to obtain the polyolefin / polystyrene blend-based wood plastic composite material. The interface adhesion between a plastic base body and the wood fiber in the wood-plastic composite material, and the compatibility between the plastic components polyolefin and the polystyrenes are improved, so that the tensile strength and impact strength of the composite material are improved. Moreover, the preparation method of the polyolefin / polystyrene blend-based wood plastic composite material has the advantages of being simple in process, high in generating efficiency and low in cost.

Description

technical field [0001] The invention belongs to the field of wood-plastic composite materials, and in particular relates to a polyolefin / polystyrene blend-based wood-plastic composite material and a preparation method thereof. Background technique [0002] The wood-plastic composite material prepared by compounding lignocellulosic materials and polymer resins is a new type of wood-substituting material that is both similar to wood and superior to wood. It fully embodies circular economy, resource utilization, health and environmental protection, and economical substitution. The advanced concept of sustainable economic development is a promising environment-friendly composite material with a wide range of application fields and development prospects. [0003] In recent years, with the increasing amount of plastic used in the world, plastic waste and its environmental pollution have caused more and more concerns. How to effectively recycle various waste plastics has become one...

AI Technical Summary

Problems solved by technology

In recycled plastics, polyethylene, polypropylene and polystyrene occupy a considerable proportion, but due to the poor compatibility between polyethylene, polypropylene and polystyrene, and the interface adhesion between polar wood fibers Therefore, the mechanical properties of the prepared wood-plastic composites are very low, which seriously limits the recycling of waste plastics and the development of high-performance wood-plastic composites.

[0004] In the Chinese patent "A wood-plastic composite material and its manufacturing method" (application number: CN200510135239), it is disclosed that the recycled polyolefin mixture and wood powder are reacted and extruded to prepare wood-plastic composite materials, but because all raw materials are disposable When added to a mixer for mixing, the amount of the initiator is small and is easily absorbed by wood powder, so it is difficult to mix evenly in the plastic, so that the grafting reaction between the plastic and maleic anhydride cannot be carried out effectively, and the performance of the prepared wood-plastic composite material is also difficult to obtain effectively. improve

In the Chinese patent "Wood Plastic Composite Material Prepared from Waste Plastic Mixture and Its Preparation Method" (application number: CN200710144992), it is disclosed that the waste plastic mixture is first reacted with peroxide and maleic anhydride to prepare modified waste Plastic blends are mixed with wood fibers and extruded to prepare wood-plastic composite materials. Although the prepared wood-plastic composite materials have high mechanical properties, because of the need for two extrusions, the production efficiency is low and the production cost is relatively high. High, and this method mainly considers the interfacial adhesion between the plastic matrix and the wood fiber, but there is no effective measure for the improvement of the compatibility between polyolefin and polystyrene. When the content of polystyrene is high, The resulting wood-plastic composites will be difficult to obtain ideal mechanical properties

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