标准及检测
第46卷第2期 2016年2月
香工协卖
PAINT&COATINGSINDUSTRY
Vol.46No.2 Feb.2016
凯氏定氮仪蒸馏后滴定法测定防水涂料乳液中氨含量林日平，谭晓玉，刘风娟，周焕（佛山市顺德区巴德富实业有限公司，广东佛山528322）
摘要：建立了测定防水涂料乳液中氨含量的凯氏定氰仪蒸馏滴定法。称取2样品，经凯氏定氮仪碱化蒸馏，以硼酸为接收液，用0.01mol/L的盐酸标准溶液进行滴定。该方法加标回收率为 91.3%~96.6%，测定结果的相对标准偏差小于3.0%。与JC1066一2008附录C中方法测定结果无显著性差异，凯氏定氮仪蒸馏滴定法的准确度精密度均优于标准方法JC1066一2008附录C，而且耗时短，方法可靠，满足涂料及涂料乳液厂商实施原材料及产品监控需要。
关键调：防水涂料：乳液：氨含量：凯氏定氮仪
文章编号：0253-4312（2016)02-0066-04
中图分类号：TO630.7*2
文献标识码：A
Kjeldahl Analysis Method for Determination of Ammonia
in Latex for Water-Resistant Coatings Lin Riping, Tan Xiaoyu, Liu Fengjuan, Zhou Huan
(ShundeBatf IndustrialCo.,Lid.,Foshan,Guangdong528322,China)
Abstract:The Kjeldahl analysis method for determination of ammonia in the latex for water-resistant coatings has been established. 2 g sample was alkali-distilled via the Kieldahl Azotometer. Boric acid was used as receiving solution, and O. O1 mol/L hydrochloric acid was used as the standard solution for automatic titration. The recovery of the method was in the range of 91.3%~96.6%,the relative standard deviation was less than 3.0%. Compared with the appendix C of JC 10662008 method, the results detected by this method had no signifi-cant difference. The Kieldahl Azotometer method showed better accuracy and precision than the appendix C of JC 1066—2008 method,moreover,it was a reliablemethod which consumed less time, and met the demand on monitoring of raw materials and products
Key Words:water-resistant coatings; emulsion; ammonia;Kieldahl Azotometer
聚合物水泥防水涂料.简称JS防水涂料.因其具有优异的抗渗性与稳定性且无毒环保、施工安全方便、生产成本低、工期短[2-4]等特点，已经成为防水涂料市场的主角5]，也是防水涂料未来发展的方向之一[6]。然而市场上仍然充斥着大量非标JS防水涂料，其原因之一是使用时聚合物组分和水泥混合时产
生了浓重的氨味，聚合物组分中氨味主要来源于使用的涂料乳液。生产出符合国家标准中氨限量的JS防水涂料，需要控制防水涂料乳液中氨含量。涂料乳液和涂料厂商，大多参考标准JC1066一2008来检测防水涂料乳液中氨含量，该法蒸馏、反滴定皆需人工操作，费时费力，影响了结果的准确度和精密度。利用
【基金项目】佛山市科技创新专项资全项目（2013GQ100193）：佛山市科技发展专项资金项目（2012AA100553）
作者简介：林日平（1987一），男，工程师，主要从事水性涂料和涂料乳液的聚合、应用及检测。 66