利用生产丙烯醛的废液制备聚羧酸系减水剂的研究
发布时间：2018-12-16 14:53
【摘要】：聚羧酸系减水剂是继木钙为代表的普通减水剂和以萘系为代表的高效减水剂之后发展起来的第三代高性能减水剂,它具有减水率高,保坍性好和绿色环保等优点。但目前我国减水剂市场仍是以萘系减水剂为主,其中一个原因是因为聚羧酸系减水剂在价格上不占优势。丙烯酸作为聚羧酸系减水剂生产的第二大原料,对产品价格具有较大的影响,本文将目光放在丙烯醛制备产生的含低浓度丙烯酸的废液上,在分析了对该废液中的丙烯酸提纯利用的不可行之后,讨论了利用该废液制备聚羧酸系减水剂的理论可行性。丙烯醛废液作为工业生产的尾液,具有组成多样性、根据生产工艺可变的特点,本文将其作为原料利用,对其组成和性质进行了检测,并判断将其应用于聚羧酸系减水剂行业是否会对行业标准等要求的相关参数造成影响。在聚羧酸系减水剂的合成共聚反应中,探讨了聚合反应中单体质量比、引发剂用量、链转移剂用量、反应时间和反应温度对聚羧酸系减水剂性能的影响并得出了聚合反应的最佳合成工艺。对合成的聚羧酸系减水剂进行了结构测试分析,利用凝胶色谱仪(GPC)和红外光谱仪(IR),表征了所合成的聚羧酸系减水剂的单体转化率和官能团。用合成的聚羧酸系减水剂进行了一系列水泥混凝土试验,并与市售的纯丙烯酸制备的减水剂进行了比较,结果表明用丙烯醛废液为原料制备的聚羧酸系减水剂与市售减水剂性能差别不大,且各项性质和混凝土性能符合相关标准的规定。最后,探究了用丙烯醛废液制备聚羧酸系减水剂的原理,一般在滴加液中丙烯酸浓度降低到一定浓度时,制备出的产品性能下降,而丙烯醛废液作为低浓度的丙烯酸溶液,用其制备出的聚羧酸系减水剂性能与市售减水剂差别不大。通过实验和凝胶色谱检测进行了探究,并得出了相关结论。
[Abstract]:Polycarboxylic acid series water reducing agent is the third generation high performance water reducing agent developed after the common water reducing agent represented by wood calcium and the high efficiency water reducing agent represented by naphthalene. It has the advantages of high water reducing rate, good collapse protection and green environmental protection. But at present, naphthalene series water reducing agent is still the main factor in the water reducing agent market in our country, one of the reasons is that polycarboxylic acid series water reducing agent is not dominant in price. Acrylic acid, as the second largest raw material in the production of polycarboxylic acid series water reducer, has a great influence on the product price. In this paper, we focus on the waste liquid containing low concentration acrylic acid produced by the preparation of acrolein. After analyzing the infeasibility of the purification and utilization of acrylic acid in the waste liquor, the theoretical feasibility of preparing polycarboxylic acid series water reducer from the waste liquor was discussed. Acrolein waste liquid, as the tail liquid of industrial production, has diversity of composition. According to the characteristics of variable production process, this paper uses it as raw material, and detects its composition and properties. It is determined whether the application of polycarboxylic acid superplasticizer will affect the relevant parameters of industry standards and other requirements. In the synthetic copolymerization of polycarboxylic acid superplasticizer, the mass ratio of monomer, the amount of initiator and the amount of chain transfer agent were discussed. The effects of reaction time and reaction temperature on the properties of polycarboxylic acid superplasticizer were studied. The structure of the synthesized polycarboxylic acid superplasticizer was tested and analyzed. The monomer conversion and functional groups of the synthesized polycarboxylic water reducer were characterized by gel chromatograph (GPC) and infrared spectroscopy (IR),). A series of tests on cement concrete were carried out with the synthetic polycarboxylic acid water reducer and compared with the water reducing agent prepared by pure acrylic acid on the market. The results show that the properties of polycarboxylic acid superplasticizer prepared from acrolein waste liquid are not different from those of commercial superplasticizer, and the properties and properties of concrete accord with the relevant standards. Finally, the principle of preparing polycarboxylic acid superplasticizer from acrolein waste liquid is explored. Generally, when the concentration of acrylic acid in the dripping solution is reduced to a certain concentration, the properties of the product are decreased, while the spent solution of acrolein is used as a low concentration acrylic acid solution. The properties of polycarboxylic acid superplasticizer prepared by it are not different from that of commercial superplasticizer. Experiments and gel chromatographic detection were carried out, and relevant conclusions were obtained.
【学位授予单位】：山西大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU528.042.2
本文编号：2382535
[Abstract]:Polycarboxylic acid series water reducing agent is the third generation high performance water reducing agent developed after the common water reducing agent represented by wood calcium and the high efficiency water reducing agent represented by naphthalene. It has the advantages of high water reducing rate, good collapse protection and green environmental protection. But at present, naphthalene series water reducing agent is still the main factor in the water reducing agent market in our country, one of the reasons is that polycarboxylic acid series water reducing agent is not dominant in price. Acrylic acid, as the second largest raw material in the production of polycarboxylic acid series water reducer, has a great influence on the product price. In this paper, we focus on the waste liquid containing low concentration acrylic acid produced by the preparation of acrolein. After analyzing the infeasibility of the purification and utilization of acrylic acid in the waste liquor, the theoretical feasibility of preparing polycarboxylic acid series water reducer from the waste liquor was discussed. Acrolein waste liquid, as the tail liquid of industrial production, has diversity of composition. According to the characteristics of variable production process, this paper uses it as raw material, and detects its composition and properties. It is determined whether the application of polycarboxylic acid superplasticizer will affect the relevant parameters of industry standards and other requirements. In the synthetic copolymerization of polycarboxylic acid superplasticizer, the mass ratio of monomer, the amount of initiator and the amount of chain transfer agent were discussed. The effects of reaction time and reaction temperature on the properties of polycarboxylic acid superplasticizer were studied. The structure of the synthesized polycarboxylic acid superplasticizer was tested and analyzed. The monomer conversion and functional groups of the synthesized polycarboxylic water reducer were characterized by gel chromatograph (GPC) and infrared spectroscopy (IR),). A series of tests on cement concrete were carried out with the synthetic polycarboxylic acid water reducer and compared with the water reducing agent prepared by pure acrylic acid on the market. The results show that the properties of polycarboxylic acid superplasticizer prepared from acrolein waste liquid are not different from those of commercial superplasticizer, and the properties and properties of concrete accord with the relevant standards. Finally, the principle of preparing polycarboxylic acid superplasticizer from acrolein waste liquid is explored. Generally, when the concentration of acrylic acid in the dripping solution is reduced to a certain concentration, the properties of the product are decreased, while the spent solution of acrolein is used as a low concentration acrylic acid solution. The properties of polycarboxylic acid superplasticizer prepared by it are not different from that of commercial superplasticizer. Experiments and gel chromatographic detection were carried out, and relevant conclusions were obtained.
【学位授予单位】：山西大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU528.042.2
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