| Lignin reticulated polyurethane foam was prepared in this paper,which would be used as filling in biological sulfureted hydrogentreatment.In the paper, Factors including polyether polyol, TDI index, catalystssystem, water vesicant as well as dosage of surfactant which affect thefinely foaming, were studied firstly. The optimal formula was: TMN3050100 parts, T-9 2.4～5 parts, TEDA-6H20 0.06～0.1 parts, L-580 1～1.5 parts,water 8～12 parts, TDI 1.03～1.07.Based on the optimal formula, lignin reticulated polyurethane foamwas prepared. It was discussed for the process and structure of ligninreticulated polyurethane foam to the effects of lignin granule. Thesolvent effect on distributing of lignin granule in polymer was alsostudied in detail; moreover, factors influenting physical and thermalproperties of the material and performance of biological film growth wereinvestigated too. The results indicated that 1,4-dioxane was chosen as thesolvent of lignin because of its great effect on distributing of lignin granule in polyurethane foam. Bubble nucleating and porosity wereimproved by adding lignin granule, and cell size of the polyurethane foamwas decreased. Not only physical property but also thermal property ofthe material were enhanced. Compared with soft polyurethane foam,tensile strength of lignin reticulated polyurethane foam was raised by140% at most which lignin content was 5%, and the heat-degradationtemperature at the first stage was 50℃more than soft polyurethane foamwhich lignin content was 10%. There had been a great improvement inheat resistance of the material. It was showed that weight of biologicalfilm reached to 10000 mg/L and 12100 mg/L when the lignin content ofthe polyurethane foams was 5% and 8% respectively via 30-day biofilmformation testing.Lignin reticulated polyurethane would be used as a filling inbiological sulfureted hydrogen treatment, which was not only a fitmedium for bacteria but also a merchandise. It was the first time for it tobe used in this new field. |
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