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| Preparation and characterization of the whole component membranes of defatted rice bran |
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| KeyWord:rice bran degradable film alcohol washed rice bran preparation process characterization |
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| Abstract: |
| In order to develop low-cost, high-yield biodegradable membrane material processing raw materials and preparation process,a technical way was explored to prepare membrane materials by using rice bran processing by-products. With rice bran cake and meal as raw materials to prepare a variety of rice bran-based membrane raw materials, and then alkali treatment-wet film-forming process was used to prepare a variety of rice bran-based membrane materials. By comparing the mechanical properties of different rice bran-based membrane materials, the best membrane raw materials was obtained. On this basis,the film-making auxiliaries (cross-linking agent and plasticizer) were selected, and the orthogonal experiment was used to optimize the process conditions for the preparation of membranes, and the structure of membranes was characterized. The results showed that alcohol washed rice bran (AWRB) whole component obtained after alcohol washing of rice bran pressed cake was the best membrane raw materials. The optimal process conditions for the preparation of AWRB whole component membranes were obtained as follows: with glutaraldehyde (GA) as crosslinking agent, glycerol as plasticizer, solid-liquid ratio 1∶ 5, alkali treatment temperature 50 ℃, alkali treatment time 60 min, glycerol dosage 10%(based on the mass of AWRB), and GA dosage 1.6%(based on the mass of AWRB). The tensile strength of the AWRB whole component membranes was 16.9 MPa and the elongation at break was 1.6% under these conditions. Structural characterization results showed that the AWRB whole component membranes had high thermal stability, dense structure and no cracking. The polysaccharides and proteins in AWRB formed a network structure with higher thermal stability under the cross-linking effect of GA; insoluble crude fibers and proteins played a synergistic effect, which effectively improved the mechanical strength of the membranes. The raw material preparation of AWRB whole component membrane does not require complex separation operation, and it is expected to realize the full effective utilization of rice bran resources, such as oil production from rice bran, phytic acid extraction, and preparation of rice bran-based biodegradable membrane. |
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