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溶解性可控的聚丙烯酰胺-co-乙烯胺型交联染料的合成及性能研究
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摘要
本文设计合成了一系列溶解性可控的聚丙烯酰胺-co-乙烯胺型交联染料,详细研究了染料的分子结构中氨基与磺酸基比例、染料浓度以及电解质等对该类染料的溶解性能的影响规律,并将其用于指导染料在棉纤维上的染色研究。此类大分子染料与棉纤维之间通过交联剂发生化学交联反应,实现染料在棉纤维上高的染色固色率
     论文以低分子量的聚丙烯酰胺为原料,通过对Hofmann降解反应的研究,证明在合成中低氨基含量的聚丙烯酰胺-co-乙烯胺时,碱用量可降至聚丙烯酰胺摩尔量的3.5倍,并在此碱量下得到了氨基含量低于80%的聚丙烯酰胺-co-乙烯胺的可控合成线性关系式。利用红外、13C NMR和元素分析对产物结构进行了表征。以此线性关系式为依据,合成了氨基含量为75%的聚丙烯酰胺-co-乙烯胺,作为大分子交联染料的主链。
     以三聚氯氰和氨基芳磺酸类化合物为原料,设计合成了10个一氯均三嗪型芳磺酸衍生物3a~3j。将3a~3j接枝到聚丙烯酰胺-co-乙烯胺中,合成了10个含芳磺酸的聚丙烯酰胺-co-乙烯胺,即大分子中间体P-3a-P-3j。当取代度为33.3%以下时,反应效率92%以上。利用红外、电喷雾质谱和薄层色谱证明了产物结构正确。研究了大分子中间体的结构与溶液性能的关系,结果表明,其溶液性能主要受其分子结构中的氨基与磺酸基比例的影响。当氨基与磺酸基比例为1.4左右时,其溶解所需的pH值在8.0左右,氨基与磺酸基比例每降低1.3~1.5倍,其溶解所需的pH值降低约2-3。
     在大分子中间体的溶液性能研究基础上,进行分子结构设计来匹配最佳偶合反应条件。选择取代度为20%以上的P-3j作为大分子偶合组分,与小分子重氮组分反应,合成了6支红色大分子染料Pd-R-a-Pd-R-f。利用红外和可见光光谱表征了合成产物。
     同样,依据大分子中间体的溶液性能研究结果,论文还设计合成了含不同磺酸基个数的一氯均三嗪型发色体d-Y-4a-d-B-4j。并通过接枝法合成了10支分子结构中氨基与磺酸基比例可控的大分子染料Pd-Y-4a-d-B-4j,当染料的取代度在26.7%以下时,反应效率96%以上。利用红外、电喷雾质谱和薄层色谱证明了产物结构正确。以黄色大分子染料Pd-Y-4a-Pd-Y-4d为例,研究了该类染料的溶液性能,结果表明,在20~50g/L的浓度下,取代度为25.6%的大分子黄色染料中,发色体中磺酸基个数从1增加到4时,其溶解所需的pH值可从12降至7.5左右。
     将该类染料的溶液性能研究结果用于指导染料的染色过程。采用轧染染色工艺,并通过交联剂M固色,该类染料在棉纤维上的固色率达到96%左右,干湿摩擦牢度为3-4级,水洗牢度4-5级。黄色、蓝色和红色染料的日晒牢度分别为4-5级、6级和2-3级。
In this thesis, a series of poly(acrylamide-co-vinylamine) crosslinking dyes with controllable solubility for cotton fibers were designed and synthesized. The effects of the ratio of amino to sulfonate groups in these dyes, concentration of dye solution and content of salt on solution properties of these dyes were studied in detail. The solution properties of these dyes were used to provide guidance in their dyeing process. High fixation could be achieved through covalent bonds between these dyes and cotton fibers by crosslinking agent.
     Poly(acrylamide-co-vinylamine) with middle and low amino content was synthesized by Hofmann reaction of polyacrylamide with low molecular weight, in which NaOH dosage was only3.5times of that of polyacrylamide. The linear equation of controllable synthesis of poly(acrylamide-co-vinylamine) in which the amino content is below80%at this low NaOH dosage was obtained. The structure of the product was characterized by IR,13C-NMR and elemental analysis. The poly(acrylamide-co-vinylamine) with75%amino content which was used as main train of the macromolecular dyes was obtained under the directions of the linear equation.
     Ten aryl sulfonate derivatives containing monochlorotriazine group3a-3j were designed and prepared using cyanuric chloride and aryl sulfonate as raw materials. Ten macromolecular intermediates P-3a-P-3j were synthesized by grafting reaction of poly(acrylamide-co-vinylamine) with aryl sulfonate derivatives3a-3j. When the degree of substitution (DS) of the macromolecular intermediate is below33.3%, the grafting efficiency is above92%. The structures of the synthesized products were confirmed by IR, ESI-MS and thin layer chromatography (TLC). The relationship between the structures of the macromolecular intermediates and their solution properties was investigated. The results showed that their solution properties were influenced mainly by the ratio of amino to sulfonate groups in their structures. They can be soluble at about pH8.0when their ratio of amino to sulfonate groups is1.4, and this ratio decreases by1.3~1.5times, the soluble pH of the macromolecular intermediate decreases by2-3.
     Based on the studies of the solution properties of the macromolecular intermediates, the structures of the macromolecular intermediates were designed to match the optimal conditions in the couling reaction. Using P-3j with the DS above20%as macromolecular coupling component to react with diazonium salt, six macromolecular red dyes Pd-R-a~Pd-R-f were prepared. The structures of the synthesized dyes were confirmed by IR and visable spectrum.
     According to the results of the solution properties of the macromolecular intermediates, chromophores containing monochlorotriazine group and different numbers of sulfonate groups (d-Y-4a~d-B-4j) were designed and synthesized. Ten macromolecular dyes Pd-Y-4a~Pd-B-4j with controllable ratio of amino and sulfonate groups were synthesized by grafting reaction of poly(acrylamide-co-vinylamine) with these chromophores. When the DS of the macromolecular dyes is below26.7%, the grafting efficiency is above96%. The structures of the synthesized products were confirmed by IR, ESI-MS and thin layer chromatography (TLC). Taking macromolecular yellow dyes for examples, solution properties of these dyes were studied. The results showed that at the concentration of20~50g/L and DS of25.6%, when the number of sulfonate group in the chromophore increases from1to4, the pH value in which the macromolecular yellow dyes can be soluble decreased from12to7.5.
     The results of the solution properties of the macromolecular dyes were used to provide guidance in the dyeing process. The dyeing characteristics of these dyes were studies through padding operation. Using crosslinker M as a fixation agent, the fixation of these dyes on cotton fibers reached about96%. Dry and web rub fastness was both3-4grade, and wash fastness was4~5grade. The light fastness of yellow, blue and red dyes on cotton was4-5grade,6grade and2~3grade, respectively.
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