Research On The Mechanism Of Biomass Composites And Porcerax â…¡ Mold Development

Biomass composites, as one of the green materials, are prepared through foam molding process. These composites become the ideal substitute for some plastic materials because of the advantages that wide bio-sources, simple preparation and environmental friendliness. However, the problems in treated mechanism and the hot-press molding of biomass composites have resulted in the low qualified rate, seriously limited the industrialization of the biomass composites and can’t meet the market requirement.In order to solve these problems, this paper carries out several researches below as the main line of "components mechanism, forming mechanism and production application".(1) For the problem of the unclear preconditioning mechanism of starch plastification and fiber alkaline treatment, it is found the hydrogen bonding mechanism in biomass composites.This paper uses infrared spectroscopy, X-ray diffraction, differential scanning calorimetry, thermogravimetric analysis, SEM and mechanical properties testing experiments to research on the thermoplastic starch (TPS) prepared by compound plasticizers, the alkaline treated fibers and four kinds of fibers reinforced biomass composites. It is analyzed that the optimal mass proportion of starch/formamide/urea and the influence of excess plasticizers on the combination of starch molecules and the plasticizer molecules. It is researched that the effects of starch plastification on the crystal structure of native starch and the melting temperature of the starch. Besides, it is studied that the best concentration of NaOH solution in alkaline treated fiber. And the influence of alkaline treatment on the internal structure and morphology of sisal fibers and the internal hydrogen bond structure of cellulose is also explored. It is analyzed that these new hydrogen bonds between the thermoplastic starch chains and the molecular chains of the fiber in these new biomass composites, and the forming mechanism during the hot-pressing foam process. The research on the starch plastification, fiber alkaline treatment and the forming mechanism of biomass composites provide the theoretical basis and technical requirements for the development of the forming mold.(2) For the problem of the breathable and machining performance of Porcerax-II, it is built the cored mold inside the Porcerax-II.Exploration for the properties of Porcerax-II, this paper focuses on the selection of methods of machining Porcerax-II, pore morphology, porosity, surface roughness, permeability and other basic performance parameters through experimental research. The internal channels were researched by experiments. The amount of Porcerax-II porosity and the pore size of Porcerax-II are studied. By fitting the Ergun model, the air permeability coefficient of Porcerax-II is researched. It provides theoretical data support to design foaming mold of biomass composites.(3) For the existing defects of the forming mold, it is developed the Porcerax-II inlaid type mold.Considering the problems of the foaming mold, this paper chooses Porcerax-II as the mould material and uses Porcerax-II and aluminum to design the inlaid mold. The key structure of the design mold is analyzed. The two-dimensional diagram and three-dimensiona diagram of the mold are drawn by Solid-Works. The optimization of Porcerax-II permeability is that corrosion, polishing and cleaning. The comparative experiments the application of old and new mold is studied. The mechanical properties of biomass composites made by old and new mold are compared. Porcerax-II mold could promoted the industrialization application of biomass composites.This paper firstly researches and analyses the starch and fibers that are the main raw of biomass composites. The microscopic mechanism of thermoplastic starch and alkalized fiber is also studied, besides, the molding mechanism of the biomass composites, which provides the theoretical basis and technical requirements for the development of the forming mold. Secondly, the properties of Porcerax-II were explored, which provided basic parameters for the development of mold. Finally, combining the theoretical basis, technical requirements and basic parameters of Porcerax-II, the Porcerax-II inlaid mold was developed and designed. It provides the theoretical basis and technical support for industrialization application of biomass composites.