摘要
以TFT-LCD液晶为实验材料,研究了其焚烧失重特征,分析其焚烧产物并对其过程进行推测。结果表明,由多种单体化合物组成的TFT-LCD液晶材料焚烧反应过程主要发生在150～380℃,该过程导致约90%液晶损失;在焚烧过程中液晶材料首先发生分解反应,分解产物生成的先后顺序取决于其单体化合物的主要化学键键能大小;分解过程产生的烃类自由基和芳香族自由基极不稳定,前者进一步分解生成C原子更少的丙烯等烃类,后者会因高温进一步分解乃至脱F,同时自由基团之间重组发生再合成反应;液晶焚烧产生由多种芳香族化合物组成的混合物,焚烧温度高易生成PAHs和HF。TFT-LCD焚烧产物绝大多数是有毒有害物质,不宜进行焚烧处理。
The incineration reaction process of TFT liquid crystal is speculated according to the weight loss character and analysis results of incineration production.It is indicated that the 90% weight is loss from 150 ℃ to 380 ℃ in the incineration process of TFT liquid crystal,which is composed of some monomer compounds.Decomposition reaction first occurs in the process of incineration process.The order of decomposition product lies on the chemical bond energy of monomer compound.The production of radical alkyl and radical aromatic in decomposition process are unstable.Radical alkyl is decompounded hydrocarbon that has much less carbon atom,such as propylene.Decomposition reaction of radical aromatic continues and defluorinate happens with temperature rise.The synthesize reaction occurs between the decomposition production.The production is admixture composed of different aromatic compounds in low temperature.PAHs and HF are observed in high incineration temperature.The mostly incineration production of TFT liquid crystal are venomousness and injurant,so it is not suitable to treat TFT liquid crystal with incineration.
出处
《重庆大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2011年第7期107-113,共7页
Journal of Chongqing University
基金
环境保护部公益项目(HBGY200709006)
中国环境科学研究院中央级公益性科研院所基本科研业务专项(2007KYYW02)
关键词
液晶
单体化合物
有机污染物
焚烧
liquid crystal
monomer compound
organic pollutants
incineration
