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RPE/Sand Powder Blends and the Study on Its Compatibilization

Author: ZhengWei
Tutor: WangYan
School: Wuhan Institute of Technology
Course: Materials Processing Engineering
Keywords: Recycled polyethylene Sand powder Blending Modification Maleic anhydride Graft modification
CLC: TQ320.1
Type: Master's thesis
Year: 2010
Downloads: 61
Quote: 0
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Abstract


In particular the re-use of the generic plastic recycled plastic is one of the important topics of environmental protection and sustainable development, the method is mainly used for the regeneration of waste plastics and other polymers or fillers blending modification to get superb performance composite materials. Based on the principles of waste utilization and low-cost multi-purpose, the paper selection of the previous few studies of ordinary sand powder and recycled polyethylene (RPE) were prepared by melt blending method composite material suitable for use as structural and decorative plates. Due to the the RPE and inorganic fillers nature quite different, both difficult to close together, which can seriously affect the performance of the blends, so the papers were prepared in reference to the basis of previous studies on modifier polyethylene grafted with maleic anhydride (PE-g-MAH) and SEBS graft maleic anhydride (SEBS-g-MAH), RPE / sand powder blended material was prepared by a melt-blending method, using the product of the above graft RPE / sand powder Blends compatibilizer modified, the the modifier dosage and types of the mechanical properties of the blend system. Using different conditions docking solution grafted and melt grafting of high density polyethylene (HDPE), maleic anhydride (MAH) graft modified to study the amount of initiator, monomer ratio, reaction temperature, reaction time, etc. grafting rate and grafting efficiency of branch modified products, chemical analysis and infrared spectroscopy quantitative analysis and characterization of graft product. The results showed that the monomer and initiator dosage was the main factor affecting the grafting reaction. For the solution method, when the material composition ratio is of HDPE: BPO: mAH = 100:2:10 (mass ratio), the graft ratio and graft efficiency; melt grafting, when the material composition ratio of HDPE: DCP : MAH = 100:3:12, grafting ratio and grafting efficiency of the best. DCP as initiator using a torque rheometer melt graft prepared SEBS-g-MAH graft-modified product, the composition ratio of the SEBS: MAH: DCP = 100:10:1 when grafting rate and then when the reaction system sticks optimal efficiency; contribution is very small on the grafting rate would decrease when the MAH the amount exceeds 10%, the grafting efficiency. The RPE / sand powder blends were prepared by melt blending method and tested their physical and mechanical properties. The results showed that the sand powder added can effectively improve the tensile strength and flexural properties of the RPE, but the impact strength of the material is decreased, when the blend composition ratio of RPE: sand powder = 100:80, material mechanical properties Best. In addition, sand powder also improve the surface hardness and the Vicat softening point of the material, but the water absorption is slightly increased, while the melt viscosity of the blend system is increased, decreased workability. The use of prepared graft product compatibilizer modified RPE / sand powder blends the compatibilizer amount and type of the mechanical properties of the blends. The results showed that the SEBS-g-MAH blends toughening effect, enhance the effect of the PE-g-MAH's best, LDPE toughening effect, but not as good as the first two combined effect. Compatibilizer added to improve the rheological properties of the blends. Graft grafting rate has little effect on the mechanical properties of the material and the balance torque. The blend sample impact fracture morphology analysis by scanning electron microscopy and compatibilization mechanism were Exploration. The results showed that with the PRE resin sand powder of the surface modification treatment by the silane coupling agent in the role of the compatibilizer to form a secure interfacial bonding, so that the composite material can be utilized effectively when subjected to external damage, sand powder particles rigid carrier and transmission failure stress, and improve the ability of a material to resist external damage, and achieved good results both strengthen and toughened.

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