胶合板甲醛释放限量规定及检测方法比较

我国胶合板现行国家标准GB/T 9846于1988年制定,2004年进行了第1次修订。过去20年里,胶合板的甲醛释放水平有较大改善,检测标准有了较多更新。而胶合板国家标准中仅规定了10 L干燥器法,欧美国家广泛采用气候箱法及气体分析法测试,我国标准至今仍难以得到国际的认可。此外,我国的甲醛限量规定也过于宽松,难以满足出口目标国对甲醛测试的要求,为出口胶合板甲醛释放量评价带来一定的困难。目前,我国胶合板产品可以达到低醛甚至无醛级水平,而国家标准仍采用检出限较高的乙酰丙酮法。为适应低醛胶合板检测要求,甲醛溶液定量分析可采用精度更高的酚试剂法或高效液相色谱法。
Current national standard for plywood GB/T 9846 in China was enacted in 1988, and revised for the first time in 2004. The formaldehyde emission level of plywood was reduced greatly and the test method of free formaldehyde was also improved in the past 20 years, but the method employed in the national standard was still 10 L desiccator method, which was adopted from Japan non-identically with respect to specimen number, color temperature etc. However, in western countries, climate chamber method and gas analysis predominated the test method. So far, our national standard failed to gain international recognition. In addition, the national standard set a loose limitation on formaldehyde emission, and lead to the difficulty to test on plywood for export purpose which may lead to failure to meet the emission standard of formaldehyde of the destination country. Now, plywood product could produce little or no formaldehyde emission,and acetyl acetone method with relative high detection limit was still employed in the standard. In order to test on plywood with low formaldehyde emission, phenol reagent method and high performance liquid chromatography of higher accuracy could be applied in test