脲醛树脂类废弃建筑垃圾热解处理研究
Study of the pyrolysis of construction waste containing urea-formaldehyde resins
张德升 1刘林 1左宗良2
作者信息
- 1. 青岛市市政公用工程质量安全监督站,青岛 266022
- 2. 青岛理工大学 环境与市政工程学院,青岛 266525
- 折叠
摘要
脲醛树脂是一种优异的黏合剂,在建筑材料领域有着广泛的应用,传统的处理方式难以有效处置脲醛树脂类废弃建筑垃圾.创新性提出使用热解方法处理废旧脲醛树脂,通过热重-红外联用(TG-FTIR)系统分析脲醛树脂热解的反应行为与气相产物,为脲醛树脂热解处理提供理论依据和数据支撑.研究表明,脲醛树脂的热解主要分为水分及添加剂的挥发和树脂的裂解两个阶段,且主要以第 2 阶段为主;900℃时UF1(呈块状的脲醛树脂)的累计产气率比UF2(呈颗粒状的脲醛树脂)高 32.6%,且随着温度从 600℃提高到 900℃,累计产气率提高不大;通过Coats-Redfern法确定了脲醛树脂热解的反应级数为 1.4,UF1 的活化能比UF2稍高;通过FTIR分析发现,脲醛树脂热解的气相产物主要是CO2,H2 O以及含有C—H键、N—H键、羰基的化合物,N元素主要以氮氢化合物而不是高污染的氮氧化合物形式存在.
Abstract
Urea-formaldehyde resin is an excellent adhesive with a wide range of applications in the field of building materials.Traditional disposal methods are difficult to effectively dis-pose of building waste containing urea-formaldehyde resin.In this paper,the pyrolysis method was innovatively proposed to treat urea-formaldehyde resin waste.The reaction be-havior and pyrolysis gas-phase products of urea-formaldehyde resin pyrolysis were systemati-cally analyzed by thermogravimetric infrared coupling(TG-FTIR)system,which provided theoretical basis and data support for urea-formaldehyde resin pyrolysis treatment.The re-sults show that the pyrolysis of urea-formaldehyde resin is mainly divided into two stages:the volatilization of water and additives and the cracking of resin,and the second stage plays the main role.At 900℃,the cumulative gas production rate of UF1(bulk urea-formalde-hyde resin)was 32.6%higher than that of UF2(granular urea-formaldehyde resin),and the cumulative gas production rate increased little with the increase in temperature from 600 to 900℃.The reaction order of urea-formaldehyde resin pyrolysis was determined to be 1.4 by the Coats-Redfern method,and the activation energy of UF1 was slightly higher than that of UF2.FTIR analysis shows that the gas-phase products of urea-formaldehyde resin crack-ing are mainly CO2,H2 O and compounds containing C-H bonds,N-H bonds and carbonyl groups.The nitrogen element is mainly in the form of nitrogen-hydrogen compounds rather than in the form of highly polluting nitrogen oxides.
关键词
脲醛树脂/建筑垃圾/热解反应/热解动力学/热重-红外联用Key words
urea-formaldehyde resin/construction waste/pyrolysis reaction/pyrolysis kinet-ics/TG-FTIR引用本文复制引用
基金项目
国家自然科学基金资助项目(52104397)
出版年
2024
NETL
NSTL
维普
万方数据