不同分子量聚乙二醇硼酸酯改性透明防火涂料的耐火性、热性能及抗老化性能

Fire Resistance, Thermal and Anti-Ageing Properties of Transparent Fire-Retardant Coatings Modified with Different Molecular Weights of Polyethylene Glycol Borate.

作者信息

Yan Long, Tang Xinyu, Xie Xiaojiang, Xu Zhisheng

机构信息

Institute of Disaster Prevention Science and Safety Technology, School of Civil Engineering, Central South University, Changsha 410075, China.

出版信息

Polymers (Basel). 2021 Nov 30;13(23):4206. doi: 10.3390/polym13234206.

DOI:10.3390/polym13234206

PMID:34883706

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8659627/

Abstract

Four kinds of polyethylene glycol borate (PEG-BA) with different molecular weights were grafted into cyclic phosphate ester (PEA) to obtain flexible phosphate esters (PPBs), and then applied in amino resin to obtain a series of transparent intumescent fire-retardant coatings. The comprehensive properties of the transparent coatings containing different molecular weights of PEG-BA were investigated by various analytical instruments. The transparency and mechanical analyses indicate that the presence of PEG-BA slightly decreases the optical transparency of the coatings but improves the flexibility and adhesion classification of the coatings. The results from fire protection and cone calorimeter tests show that low molecular weight of PEG-BA exerts a positive flame-retarded effect in the coatings, while high molecular weight of PEG800-BA behaves against flame-retarded effect. Thermogravimetric and char residue analyses show that the incorporation of low molecular weight of PEG-BA clearly increases the thermal stability and residual weight of the coatings and generates a more compact and stable intumescent char on the surface of the coatings, thus resulting in superior synergistic flame-retarded effect. In particular, MPPB1 coating containing PEG200-BA exerts the best flame-retarded effect and highest residual weight of 36.3% at 700 °C, which has 57.6% reduction in flame spread rate and 23.9% reduction in total heat release compared to those of MPPB0 without PEG-BA. Accelerated ageing test shows that low molecular weight of PEG-BA promotes to enhance the durability of structural stability and fire resistance of the coatings, while PEG800-BA with high molecular weight weakens the ageing resistance. In summary, the fire-resistant and anti-ageing efficiencies of PEG-BA in the coatings depend on its molecular weight, which present the order of PEG200-BA > PEG400-BA > PEG600-BA > PEG800-BA.

摘要

将四种不同分子量的聚乙二醇硼酸酯（PEG-BA）接枝到环磷酸酯（PEA）中，得到柔性磷酸酯（PPB），然后将其应用于氨基树脂中，制备出一系列透明膨胀型防火涂料。通过各种分析仪器研究了含有不同分子量PEG-BA的透明涂料的综合性能。透明度和力学分析表明，PEG-BA的存在会略微降低涂料的光学透明度，但能提高涂料的柔韧性和附着力等级。防火和锥形量热试验结果表明，低分子量的PEG-BA对涂料有积极的阻燃作用，而高分子量的PEG800-BA则起到相反的阻燃作用。热重分析和残炭分析表明，低分子量PEG-BA的加入明显提高了涂料的热稳定性和残重，并在涂料表面生成了更致密、稳定的膨胀炭层，从而产生了优异的协同阻燃效果。特别是，含有PEG200-BA的MPPB1涂层具有最佳的阻燃效果，在700℃时的最高残重为36.3%，与不含PEG-BA的MPPB0相比，其火焰蔓延速率降低了57.6%，总热释放降低了23.9%。加速老化试验表明，低分子量的PEG-BA有助于提高涂料结构稳定性和耐火性的耐久性，而高分子量的PEG800-BA则会削弱其耐老化性。综上所述，PEG-BA在涂料中的耐火和抗老化效率取决于其分子量，顺序为PEG200-BA > PEG400-BA > PEG600-BA > PEG800-BA。