Properties of Different Wood Plastic Materials
The molding temperature of wood-plastic materials is an important parameter that affects the cost and performance of the material. Excessively high temperatures cause higher energy consumption, and straw powder is easily carbonized, leading to a decrease in performance. If the temperature is too low, it will affect the degree of fusion between the reinforcement and the resin and reduce the overall performance.By comparing the physical properties such as density, tensile strength, bending strength and impact toughness of different wood-plastic composite materials under the same molding process and the same wood-plastic composite material under different molding processes,Study the influence of molding process and material composition on the comprehensive properties of wood-plastic composite materials.
Analysis of influencing factors of density attributes
The density of wood-plastic composite materials depends on the density of each component. The density of polylactic acid is 1200kg/m3, which is lower than the density of PVC 1400kg/m3. The density of glass fiber waste is greater than 2000kg/m3. The density of straw powder polylactic acid wood plastic material is higher than the density properties of straw powder polyvinyl chloride wood plastic material. At the same time, the addition of fiberglass waste will increase the density of PVC wood-plastic materials.The density of straw powder is relatively low, and increasing its content can reduce the density of wood-plastic materials. Studies have shown that wood-plastic materials with a reinforcing content of 20% have the best mechanical properties.Therefore, this paper selects wood-plastic materials with a reinforcement content of about 20% as the research object. The sample density of straw powder polylactic acid wood-plastic material using a small amount of foaming agent is 960kg/m3, and the density of straw powder polyvinyl chloride wood-plastic material is about 1200kg/m3. Increasing the amount of blowing agent effectively reduces its density. The molding rate, holding pressure and holding time during the production process also have a slight impact on the density of the sample. The main reason is that too fast a molding rate is not conducive to the complete release of the foaming material, and too long holding time causes the properties of the straw powder material to change, thus affecting the density of the sample.
Comparative analysis of mechanical properties
Experimental and research data show that the tensile strength and flexural strength of straw powder PVC wood-plastic materials have reached 27MPa and 52MPa, respectively.It is better than the 18MPa and 19.5MPa of straw powder polylactic acid wood plastic. In terms of impact toughness, the straw powder polylactic acid wood plastic reaches 26KJ/m2, which is better than the 18.6MPa of straw powder polyvinyl chloride wood plastic. However, compared with traditional straw powder polypropylene wood-plastic materials, the two wood-plastic materials studied in this article have better mechanical properties.The glass fiber particles formed after glass fiber processing have high tensile strength and bending strength, which have a good promotion effect on the improvement of these two properties of wood-plastic materials.At the same time, it loses its strong toughness characteristics, reducing the impact toughness of wood-plastic materials. As a new degradable and environmentally friendly wood-plastic material, straw powder polylactic acid wood-plastic has relatively high comprehensive properties. The tensile strength and compressive strength can be further improved through the surface treatment of the reinforcing base material, the heating temperature and holding time during the wood plastic molding process, and the addition of hard materials as reinforcing bases.
