以羟甲基化木质素和壳聚糖为原料制备了木质素壳聚糖复合膜,与壳聚糖膜对比,考察了木质素和壳聚糖的共混比对膜物理性能的影响,研究了膜的抗酸性能及动态过滤螫合Cu(Ⅱ)的性能。结果表明,当共混比(质量比)为1:2时,木质素壳聚糖复合膜外...以羟甲基化木质素和壳聚糖为原料制备了木质素壳聚糖复合膜,与壳聚糖膜对比,考察了木质素和壳聚糖的共混比对膜物理性能的影响,研究了膜的抗酸性能及动态过滤螫合Cu(Ⅱ)的性能。结果表明,当共混比(质量比)为1:2时,木质素壳聚糖复合膜外观平整、光滑,厚度均匀,木质素的混入使壳聚糖膜的酸性适用范围下限由pH值4降至pH值3.5;处理500 mL Cu(Ⅱ)溶液,木质素壳聚糖复合膜单位面积膜累积Cu(Ⅱ)螯合量是0.4741 g/m^2,比壳聚糖膜提高52.39%。展开更多
In this paper, a new type of retention system of PEO/cofactor retention system is introduced, the cofactors used are phenol-formaldehyde resin, wheat straw alkaline lignin and its derivatives such as hydroxymethylated...In this paper, a new type of retention system of PEO/cofactor retention system is introduced, the cofactors used are phenol-formaldehyde resin, wheat straw alkaline lignin and its derivatives such as hydroxymethylated lignin, sulfited lignin and lignin-based phenol-formaldehyde resin. The first pass retention of newsprint slurry and the properties of handsheet are improved by using the system. The results indicate that a new application field for lignin has been exploited.展开更多
Lignin was extracted from peat by Sosa Method. In order to increase its chemical activity, it is necessary to make a structural modification by hydroxymethylation so it can be used in preparation of synthetic wood. De...Lignin was extracted from peat by Sosa Method. In order to increase its chemical activity, it is necessary to make a structural modification by hydroxymethylation so it can be used in preparation of synthetic wood. Depolymerization was made by two methods： （1） reaction oflignin with NaOH 2%; （2） exposition oflignin to UV beam for 6, 12, 24, 36, 48 and 60 hours. The best depolimerization result was with exposition of lignin to UV by 12 hours since phenylpropanoic structure with higher number of free positions （unoccupied carbons） in C3 and C5 of its aromatic ring was obtained. It is known by Mannich Reaction and determination of phenolic OH by UV analysis. Later, its reactivity was increased by hydroxymethylation process by means of reaction of depolymerizated product with formaldehyde and later with glyoxal since it is less toxic. The modified product was mixed with six different kinds of resins （phenol-formaldehyde, urea-formaldehyde, melamine-formaldehyde, Glyoxal-formaldehyde, urea-formaldehyde and melamine-formaldehyde） to obtain a better mechanical characteristic as a synthetic wood. The best result was the one with melamine-formaldehyde. Finally, this product was mixed with testa rice so final product showed a great hardness and a shinny and smooth appearance.展开更多
文摘以羟甲基化木质素和壳聚糖为原料制备了木质素壳聚糖复合膜,与壳聚糖膜对比,考察了木质素和壳聚糖的共混比对膜物理性能的影响,研究了膜的抗酸性能及动态过滤螫合Cu(Ⅱ)的性能。结果表明,当共混比(质量比)为1:2时,木质素壳聚糖复合膜外观平整、光滑,厚度均匀,木质素的混入使壳聚糖膜的酸性适用范围下限由pH值4降至pH值3.5;处理500 mL Cu(Ⅱ)溶液,木质素壳聚糖复合膜单位面积膜累积Cu(Ⅱ)螯合量是0.4741 g/m^2,比壳聚糖膜提高52.39%。
文摘In this paper, a new type of retention system of PEO/cofactor retention system is introduced, the cofactors used are phenol-formaldehyde resin, wheat straw alkaline lignin and its derivatives such as hydroxymethylated lignin, sulfited lignin and lignin-based phenol-formaldehyde resin. The first pass retention of newsprint slurry and the properties of handsheet are improved by using the system. The results indicate that a new application field for lignin has been exploited.
文摘Lignin was extracted from peat by Sosa Method. In order to increase its chemical activity, it is necessary to make a structural modification by hydroxymethylation so it can be used in preparation of synthetic wood. Depolymerization was made by two methods： （1） reaction oflignin with NaOH 2%; （2） exposition oflignin to UV beam for 6, 12, 24, 36, 48 and 60 hours. The best depolimerization result was with exposition of lignin to UV by 12 hours since phenylpropanoic structure with higher number of free positions （unoccupied carbons） in C3 and C5 of its aromatic ring was obtained. It is known by Mannich Reaction and determination of phenolic OH by UV analysis. Later, its reactivity was increased by hydroxymethylation process by means of reaction of depolymerizated product with formaldehyde and later with glyoxal since it is less toxic. The modified product was mixed with six different kinds of resins （phenol-formaldehyde, urea-formaldehyde, melamine-formaldehyde, Glyoxal-formaldehyde, urea-formaldehyde and melamine-formaldehyde） to obtain a better mechanical characteristic as a synthetic wood. The best result was the one with melamine-formaldehyde. Finally, this product was mixed with testa rice so final product showed a great hardness and a shinny and smooth appearance.
