| Plastics and papermaking industry is the two major mainstay of national economy, while waste plastics and papermaking residue formed in process of manufacture and consumption are also two magnitude contamination spots. Overtop energy consumption and serious secondary pollution is the distinct defects existing in the current comprehensive utilization methods of the two wastes. Aiming at those defects, new utilization way is researched in the paper, which solves the bottleneck of the new method and prepare hybrid composite possessing Synergistic effect. New reinforcement way is also explored in the essay.A series of waste composites were produced through melt blending using waste plastics and papermaking residue, which were pretreated by crashing-cleaning and sterilization-wet screening process, individual. Microscope test means such as FTIR, ATR, DSC and SEM are applied in the essay. Further, mechanical performance of the waste composite is generally higher than those of matrix materials, and the former can be used in material field of decoration, cement template and public utilities, etc.The applied research of reclaim plant fiber in polymer matrix waste composite is carried out in the essay firstly. Effect of preparation craftwork, properties of secondary-fiber and waste particle on mechanical performance of the waste composite are investigated. Results indicate that in secondary-fiber reinforced system, the optimal blend temperature, molding pressure, blend time and secondary-fiber mass content are 160°C, 15MPa, 15min and 20wt%, where the flexural and tensile strength of secondary-fiber/waste membrane increase by 17.27% and 16.22% compared to those of waste membrane material; In the particle reinforced composite system, waste particle make well reinforcement role when particle size is 63.21μm,106.75μm and 214.94μm, respectively, and reinforment role will behave more prominent with decreasing of particle size and content when the particle mass content is less than 30%.Author discovers that secondary-fiber has well reinforcement in waste composite, which possesses poor adhesion and gap at the interface. Aiming at the fact, typical strengthening mechanism of polymer matrix composite is complemented.The hybrid composite containing waste particles and secondary-fiber are prepared based on the optimal process parameter of secondary-fiber/waste membrane and waste particle/waste membrane composite. Effect of component match on mechanical strength is studied in the paper. Results show that mechanical properties of hybrid composite are enhanced comparing to the corresponding mechanical strength of secondary-fiber/waste membrane and waste particle/waste membrane composite under the same mass content. And the results show that positive Synergistic effect appears in hybrid composite.In the work, silane coupler KH550 and KH560 chemical surface modification have been performed on the secondary-fiber, waste particle and hybrid reinforced system. Results show that the two silane couplers have the similar modification effect, which can enhance mechanical performance of the three kinds waste composites in certain extend. The dimensional stability of composite in moist heat condition is improved after retreating. Results for mechanical performance indicate that flexural strength, tensile strength and impact strength of hybrid composite are increased by from 4.05% to 10.62%, 5.30% to 16.69%, and 10.41% to 21.45%, respectively after being modificated, when particle size is 106.75um.Because of the poor reinforcement and complex process of silane coupler, new mofication method to improve mechanical properties is quested in the essay. Mechanical performance of hybrid composite is intensified by microwave irradiation with MAPE existing. Research indicates that microwave irradiation technic has more potential comparing to silane coupler pretreatment increasing by 1.58 times to 4.04 times.Effect of different composite preparation method, microwave power, irradiation time and different irradiation way on mechanical performance of hybrid composite is researched in this paper. The intensified mechanism has been analyzed by means of FTIR, ATR, DSC and SEM. Results indicate that the general mechanical properties of composite prepared by one step process is higher than those of composite by two step process; impact strength are enhanced after irradiated by microwave under 200w,400w,600w and 850w microwave power when irradiation time is not exceeding 240 seconds; The general mechanical properties of composite intensified by microwave discontinue irradiation is higher than those intensified by continues irradiation. Author proposes that the different thermal effect and structural variation in inner composite resulted by the two irradiation ways is the root cause for explaining the different intensified effect. |
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