|Table of Contents|

Preparation and properties of monocomponent moisture-curing polyurethane cold patch liquid for pavement(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2023年3期
Page:
22-33
Research Field:
道路工程
Publishing date:

Info

Title:
Preparation and properties of monocomponent moisture-curing polyurethane cold patch liquid for pavement
Author(s):
KUANG Dong-liang1;  LI Pei-jia1;  WU Yong-chang1;  LI Ling-yun2; CAO Jun-sheng3;  CHEN Hua-xin1
(1. School of Materials Science and Engineering, Chang'an University, Xi'an 710061, Shaanxi, China; 2. Qinghai Transportation Investment Corporation, Xining 812100, Qinghai, China; 3. Shanxi Traffic Maintenance Group Corporation, Taiyuan 030001, Shanxi, China)
Keywords:
road engineering;  polyurethane binder;  moisture-curing;  viscosity;  mechanical property
PACS:
U414
DOI:
10.19721/j.cnki.1671-8879.2023.03.003
Abstract:
In order to prepare a new type of monocomponent moisture-curing road polyurethane binder which was expected to replace asphalt, the polyurethane cold patch liquid reaction monomer liquefied MDI, MDI-50, PAPI, N210, N330, DBTDL as the catalyst, and TMP as the chain extender were selected. Different types of monocomponent moisture-curing polyurethane cold patch liquid were prepared by designing different material compositions and synthesis processes. The effects of raw material composition and synthesis process on the road performance of polyurethane were investigated by measuring the viscosity, tensile strength, elongation at break, Shore hardness, and pull-out strength of polyurethane. The microstructure of polyurethane was characterized by ATR-FTIR. By testing the Marshall stability and expansion rate of the polyurethane mixture, the optimum content of polyurethane was determined. On this basis, the polyurethane mixture was prepared. The development of mechanical strength of polyurethane mixture and its curing characteristics were investigated, and the road performance was evaluated. The results show that when the molar ratio of the isocyanate group to the hydroxyl group is 3.5 to 4.5, the molar ratio of N210 to N330 is 5/5 to 7/3, the content(mass fraction, the same below)of DBTDL is 0.1%, the content of TMP is 0.5% to 1%, the reaction temperature and stirring rate are 80 ℃ to 90 ℃ and 400 to 500 r/min respectively, the isocyanate group successfully reacts with the hydroxyl group. The polyurethane synthesized has good mechanical strength and fluidity. When the content of polyurethane is 5.5% of the aggregate content, the Marshall stability can reach 3 kN after curing for1.7 h. After curing for 3 days, the dynamic stability reaches 7 853 times/mm, the low temperature damage strain reaches 6 743×10-6, residual Marshall stability reaches 85%, polyurethane mixture exceeds the requirements of the specification for HMA and has good road performance.7 tabs, 14 figs, 28 refs.

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Last Update: 2023-06-30