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CMC与金属离子螯合及其产物用作纸张阻燃助剂的研究
Study on the Reaction of CMC with Metal Ions and Application of Their Products in Flame Retardant Materials
收稿日期:2019-06-06  
DOI:10.11980/j.issn.0254-508X.2019.10.005
关键词:  CMC  金属离子  螯合  阻燃
Key Words:CMC  metal ions  chelate  flame ratardant
基金项目:广东省援疆科技(特派员)项目 x2qs/B8180070广东省援疆科技(特派员)项目(x2qs/B8180070)。
作者单位邮编
韦世鹏 华南理工大学轻工科学与工程学院广东广州510640 510640
田英姿 华南理工大学轻工科学与工程学院广东广州510640 510640
潘思源 华南理工大学轻工科学与工程学院广东广州510640 510640
卢冉 华南理工大学轻工科学与工程学院广东广州510640 510640
岳惠惠 喀什大学生命与地理科学学院新疆喀什844006 844006
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摘要:将羧甲基纤维素钠(CMC)与Cu2+、Ca2+进行螯合反应,用紫外可见分光光度仪测定其吸收光谱,探讨螯合物最佳螯合比及其热稳定性,并将其浸渍到定性滤纸中研究其阻燃性能。结果表明,Cu2+与CMC螯合物在205 nm处有最大吸收峰,且为单吸收峰,—COO-反应活性强于—OH,可判定CMC与Cu2+螯合反应中,—COO-参与和Cu2+的螯合,—OH未参与反应,推测出最佳螯合比为1;CMC与Ca2+螯合时,当螯合比c(Ca2+)/c(—COO-)小于1时,螯合物表现为双吸收峰,最大吸收波长分别为192、228 nm,表明—COO-与—OH均参与到螯合反应中,当螯合比大于1时,螯合物表现为单吸收峰,最大吸收波长为192 nm,仅有—COO-参与和Ca2+的螯合反应,并推测出最佳螯合比为2。热重分析表明,螯合物质量残留百分比均高于10%,定性滤纸质量残留百分比仅为2.87%,螯合物相较定性滤纸具有更好的热稳定性。将CMC、CMC-Cu、CMC-Ca浸渍定性滤纸,能赋予滤纸阻燃性,且经CMC-Ca处理后的定性滤纸阻燃效果最优,其极限氧指数值可达24.9%,炭化长度仅为68 mm。
Abstract:The CMC was mixed with Cu2+ and Ca2+ to carry out chelation reaction, and using the UV spectrophotometer to determine the absorbance of the products, the best chelation ratio was found. The results showed that the λmax of the chelate created by Cu2+ and CMC was at 205 nm. Because of the reactivity of —COO- was stronger than —OH, —COO- participated the reaction with Cu2+ , but —OH did not. It was speculated that the best chelation ratio was 1. When c(—COO-)/c(Ca2+) was less than 1, the chelate had double absorption peaks. λmax were at 192 nm and 228 nm. It also showed that —COO- and —OH were both involved in the chelating reaction. When c(—COO-)/c(Ca2+) was more than 1, the chelate had a single absorption peak, and λmax was at 192 nm. It was speculated that the best chelating ratio was 2. Using the TG to test the stability of the chelates, its flame retardant mechanism was discussed. The qualitative filter paper immersed with the chelating solution was subjected to vertical burning test, and the limiting oxygen index was measured. The results showed that the percentage of residual mass in thermogravimetric analysis of chelates was higher than 10%, but the percentage of residual mass in qualitative filter paper was only 2.87%. It indicated that the chelates had better thermal stability than qualitative filter paper. Adding the chelates to qualitative filter paper, the paper was difficult to burn. And the qualitative filter paper treated by CMC-Ca had the best flame retardant property. Its limit oxygen index could reach 24.9% and the carbonization length was only 68 mm.
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