Preparation And Properties Of Coniferous Pulp/ABS Wood Plastic Composite

Wood-plastic composite material is a new type of green environmental protection material that has gradually risen in China in recent years.It has the advantages of lower cost,excellent performance,beautiful appearance,and wide use.However,the properties of wood-plastic composites are affected by the types of wood fillers added,and their aging resistance is poor,and products with complex structures cannot be formed using traditional processing methods.Therefore,it is of great research significance to select suitable wood fillers,improve the aging resistance of wood-plastic composite materials,and use new processing methods to form complex and fine wood-plastic products.In this paper,ABS resin is used as the matrix,and the raw material coniferous pulp commonly used in the papermaking industry is selected to modify the ABS-based wood-plastic composite materials.The mechanical properties,thermal properties,and aging properties of the composite materials are thoroughly studied.At the same time,new 3D printing technologies are used.The material was molded,and the relationship between the material composition and 3D printing performance was systematically studied.This paper first characterized the coniferous pulp by means of material composition analysis test,electron microscope observation and thermal weight loss.The results showed that the main components of the coniferous pulp were cellulose and hemicellulose,and the lignin content was zero.Spiral strips have a rough surface texture;the initial decomposition temperature of the coniferous pulp is around 310 °C,and the maximum decomposition rate temperature is about 370 °C.Coniferous pulp was used as a filler to modify ABS plastic and ABS-based wood-plastic composite materials,respectively.The results show that with the increase of the content of coniferous pulp,the tensile strength,flexural modulus and flexural strength of the material all increase,but the impact strength decreases,and the coniferous pulp and wood flour have a synergistic enhancement effect on the ABS matrix.The addition of coniferous pulp increases the Vicat softening temperature and density of ABS-based wood-plastic composites,but reduces the material's initial decomposition temperature and maximum thermal weight loss temperature,reduces processability,and increases water absorption.Adding an interface modifier can increase the compatibility of the filler with the matrix,improve the mechanical properties of the material,reduce the number of holes at the cross section of the material,and also improve the processability and water absorption of the material.Acrylonitrile-styrene-acrylate(ASA)has excellent weather resistance due to its structural characteristics.Adding it to ABS-based wood-plastic composites can improve the aging resistance of the material.In this paper,thermal aging,ultraviolet aging,and freeze-thaw aging are used to systematically study coniferous pulp / ABS wood-plastic composite materials with different coniferous pulp contents,and coniferous pulp / ABS with different ABS / ASA ratios./ ASA wood plastic composite material aging resistance.It was found that the addition of coniferous pulp increased the oxidation induction period of ABS wood-plastic composites slightly,while the addition of ASA significantly increased the oxidation induction period of the material.Both materials exhibited good aging resistance in 21 days of thermal oxygen aging and 15 days of ultraviolet aging.With the increase of thermal oxygen and ultraviolet aging time,the surface color of the material will fade,but the addition of ASA can improve the fade phenomenon.After thermal oxygen aging,the content of coniferous pulp has little effect on the carbonyl index on the surface of the material,and the increase in ASA content reduces the increase in the carbonyl index on the surface of the material,which is conducive to enhancing the aging resistance of the material.The grey metal GM(1,1)model was used to process the long-term aging process,and the mechanical property simulation values of the composites were consistent with the actual values.Coniferous pulp / ABS 3D printing materials were prepared using fused deposition type 3D printing technology,and the effects of inorganic nano-fillers on the materials were also explored.The results show that the 3D printing material prepared by adding 3 phr of coniferous pulp and 1% wt MMT to ABS has the best mechanical properties,interlayer adhesion strength and warpage properties.With the increase of the content of coniferous pulp,the Vicat softening temperature of the coniferous pulp / MMT / ABS composite gradually increased,the initial thermal decomposition temperature gradually decreased,and the mechanical properties of the material changed little after thermal oxygen aging.,Excellent heat and oxygen aging resistance.Adding interface modifiers can improve the comprehensive mechanical properties of coniferous pulp / MMT / ABS composite 3D printed products.The modification effect is best when the content of KH-550 is 3% wt of the filler.The orthogonal experiment results show that the grating angle has the greatest impact on the comprehensive mechanical properties of the material.Optimizing the printing parameters can make the interlaminar adhesion performance of the conifer pulp / MMT / ABS composite material better than that of unmodified pure ABS.