[1]钟科,王雪,张勐,等.单组份聚氨酯固化规律及粘结特性研究[J].郑州大学学报(工学版),2021,42(06):81-86.
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单组份聚氨酯固化规律及粘结特性研究()
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《郑州大学学报(工学版)》[ISSN:1671-6833/CN:41-1339/T]

卷:
42
期数:
2021年06期
页码:
81-86
栏目:
出版日期:
2021-11-10

文章信息/Info

Title:
Curing and Adhesive Characteristics of Single-Component Polyurethane Binders
作者:
钟科王雪张勐孙明志孙晟凯龚演
文献标志码:
A
摘要:
单组份聚氨酯是一种粘结性能优异的有机高分子化合物,可作为路面混合料的胶粘剂。本文分别通过傅里叶红外光谱、拉拔、剪切试验研究了两种单组份的固化规律和粘结特性。结果表明,在自然固化条件下,PU-I和PU-II的异氰酸酯指数逐渐下降,而脲基指数则逐渐增长;固化4d后,聚氨酯的异氰酸酯含量和脲基含量变化较小,且4~7天PU-I和PU-II的异氰酸酯指数和脲基指数的变异系数分别为10%、2%,PU-II的异氰酸酯指数和脲基指数的变异系数分别为2%、2%,属于小变异,表明该材料已基本达到完全固化状态。聚氨酯粘结体系的拉拔强度和剪切强度随着固化时间的增长,呈增大的趋势,且石料-聚氨酯-石料粘结体系界面间的拉拔、剪切强度均优于石料-聚氨酯-橡胶、橡胶-聚氨酯-橡胶粘结体系,橡胶-聚氨酯-橡胶粘结体系界面的拉拔强度最差,石料-聚氨酯-橡胶粘结体系的剪切强度最差。
Abstract:
Monocomponent polyurethane is a reactive adhesive, and its mechanical properties ara better than those of convenntional asphalt binders, but the reaction process is easily affected by environmental factors such as temperature, air and water, etc. During the paving and rolling construction of polyurethane mixes, it is necessary to strictly contol the construction time nodes of each process in combination with site temperature and humidity working conditions, In order to popularize the application of single-component polyurethane in road, curing and adhesive characteristics of monocomponnent polyurethane (PU) binders were studied from FTIR,  poll-out and shear tests. With the increase of natural curing conditions, the results showed that the iscoyanate index of PU-I and PU-II decreased, while the urea index had the opposite trend. Both the isocyanate index and urea index of PU were stable after 4 days natural curing, and the variation coefficients of isocyanate index amd urea index of PU-I and PU-II were 10% and 2%, 2% and 2%, respectively in 4-7 days,which belong to small variations, indicating that PU had basically reached the fully cured state. With the increase of curing time, the poll-out strength and shear strength of polyurethane bonding system generally increased, and the poll-out and shear strength of stone-polyurethane-stone interface were better than those stone-polyurethane-rubber,rubber-polyurethane-rubber bonding system. The poll-out strength of rubber-polyurethane-rubber interface was the worst, and the shear strength of stone-polyurethane-rubber interface was the worst.
更新日期/Last Update: 2021-12-17