受阻酚对灌缝胶体系的抗老化改性效果研究

摘要/Abstract

摘要： 为研究受阻酚对沥青路面灌缝胶体系的抗老化改性效果,采用受阻酚1076、受阻酚二叔丁基对甲酚(BHT)以及受阻酚1010对制备的普通型灌缝胶进行改性,模拟现场施工情况进行老化试验,对比老化前后灌缝胶性能及黏弹性特征变化,并进行结构表征分析。结果表明,受阻酚1076可以在老化12 h内持续改善灌缝胶的抗老化性能;受阻酚BHT在老化6 h内可以有效遏制极性基团的生成,抑制灌缝胶模量的升高,但在长时间老化下其抗老化效果衰退明显;受阻酚1010在老化6 h内抗老化效果并不理想,但在老化12 h后可以有效抑制羰基的生成。受阻酚对灌缝胶体系的抗老化改性效果受到受阻酚分子结构、迁移性及其与灌缝胶体系相容性的影响。高相容性、低位阻效应以及低迁移性有助于受阻酚稳定、高效地提升灌缝胶的抗老化性。异佛尔酮二异氰酸酯可以有效改善受阻酚在灌缝胶中的分散性,从而进一步提升抗老化效果。

关键词: 灌缝胶, 受阻酚, 抗氧剂, 老化, 改性, 相容性

Abstract: In order to study the anti-aging effect of the hindered phenolic on the crack sealant system, hindered phenol 1076, butylated hydroxytoluene (BHT) and hindered phenol 1010 were used to modify the as-prepared ordinary sealants. Under the field condition, the crack sealant systems before and after modification were aged. Then, the performance changes, viscoelastic characteristics of the crack sealant before and after aging were compared, and the structural was characterized. The results show that the crack sealant modified with hindered phenol 1076 sustains anti-aging effect within 12 h of aging time. Hindered phenol BHT effectively inhibits the formation of polar groups and the increase of sealant's modulus within 6 h of aging time. However, after aging for long time, the anti-aging effect of hindered phenol BHT declines obviously. Hindered phenol 1010 effectively inhibits the formation of carbonyl group after aging for 12 h but exhibits insufficient anti-aging effect within 6 h aging time. The anti-aging effect of the antioxidants is affected by its molecular structure, migration and the compatibility with the crack sealant system. The high compatibility, low steric hindrance effect and low migratibility are helpful for hindered phenol to improve the anti-aging property of crack sealant stably and efficiently. Isophorone diisocyanate can effectively improve the dispersion of hindered phenol in the crack sealant, further improving the anti-aging effect of the sealant system.

Key words: crack sealant, hindered phenol, antioxidant, aging, modification, compatibility

中图分类号:

U418

刘汉超, 张凯华, 张菁燕, 滕新华. 受阻酚对灌缝胶体系的抗老化改性效果研究[J]. 硅酸盐通报, 2023, 42(7): 2656-2666.

LIU Hanchao, ZHANG Kaihua, ZHANG Jingyan, TENG Xinhua. Anti-Aging Modification Effect of Hindered Phenol in Crack Sealant System[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(7): 2656-2666.

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