胶粉表面氧化机理及对改性沥青储存稳定性的影响

摘要/Abstract

摘要： 为了增强胶粉表面活性,改善胶粉改性沥青的储存稳定性,分别采用H₂O₂溶液和NaClO溶液对废旧胶粉进行表面氧化处理,并考察了FeSO₄·7H₂O对H₂O₂溶液氧化过程的催化作用。通过傅里叶红外光谱(FTIR)、扫描电子显微镜(SEM)以及电子能谱(EDS)研究了胶粉氧化前后的微观结构,并采用48 h离析试验对胶粉氧化前后改性沥青的储存稳定性进行了表征。试验结果表明:在两种氧化剂的作用下,胶粉表面活性含氧基团增加,微观形貌发生改变;胶粉氧化前后的主要元素均为C、O、S,且氧化胶粉表面O元素的相对含量显著增加;此外,H₂O₂-FeSO₄溶液氧化的胶粉改性沥青储存稳定性显著提高,满足了我国对聚合物改性沥青的要求。

关键词: 氧化处理, 胶粉, NaClO, H₂O₂, 微观结构, 胶粉改性沥青, 储存稳定性

Abstract: In order to enhance the surface activity of crumb rubber and improve the storage stability of crumb rubber-modified asphalt, H₂O₂ and NaClO solutions were used to oxidize waste crumb rubber powder and the catalytic effect of FeSO₄·7H₂O on the oxidation process of H₂O₂ solution was investigated. The microstructures of crumb rubber before and after oxidation were studied by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The storage stability of crumb rubber-modified asphalt was characterized by 48 h segregation test. The results show that the surface active oxygen-containing groups of crumb rubber increase and the microstructures change under the action of two oxidants. The main elements of the powder before and after oxidation are C, O and S. The relative content of O on the surface of oxidized crumb rubber increases significantly. Besides, the storage stability of crumb rubber-modified asphalt oxidized by H₂O₂-FeSO₄ solution is significantly improved, which meets the requirements of polymer-modified asphalt in China.

Key words: oxidation treatment, crumb rubber, NaClO, H₂O₂, microstructure, crumb rubber-modified asphalt, storage stability

中图分类号:

U414

程勇, 刘玉梅, 鞠健, 郑木莲, 潘希峰, 朱月明. 胶粉表面氧化机理及对改性沥青储存稳定性的影响[J]. 硅酸盐通报, 2021, 40(12): 4178-4186.

CHENG Yong, LIU Yumei, JU Jian, ZHENG Mulian, PAN Xifeng, ZHU Yueming. Surface Oxidation Mechanism of Crumb Rubber and Its Effect on Storage Stability of Crumb Rubber-Modified Asphalt[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(12): 4178-4186.

参考文献

[1] 宋莉芳,张婷,乔云雁,等.高锰酸钾氧化废轮胎胶粉对橡胶沥青性能的影响[J].材料科学与工程学报,2018,36(5):795-799.
SONG L F, ZHANG T, QIAO Y Y, et al. Influence of potassium permanganate oxidization of crumb tire rubber on performance of rubber asphalt[J]. Journal of Materials Science and Engineering, 2018, 36(5): 795-799 (in Chinese).
[2] 孙祖望,陈舜明,张广春.橡胶沥青路面技术应用手册[M].北京:人民交通出版社,2014:9-10.
SUN Z W, CHEN S M, ZHANG G C. Technical application manual of rubber asphalt pavement[M]. Beijing: China Communications Press, 2014: 9-10 (in Chinese).
[3] 郑木莲,韩丽丽,李宜锋,等.不同形貌纳米材料对Terminal Blend沥青性能及微观结构的影响[J].材料科学与工程学报,2018,36(5):720-725.
ZHENG M L, HAN L L, LI Y F, et al. Morphology effect on properties and microstructure of Terminal Blend crumb rubber modified asphalt[J]. Journal of Materials Science and Engineering, 2018, 36(5): 720-725 (in Chinese).
[4] 黄卫东,李彦伟,杜群乐.橡胶沥青及其混合料的研究与应用[M].北京:人民交通出版社,2013:13-19.
HUANG W D, LI Y W, DU Q L. Research and application of rubber asphalt and its mixture[M]. Beijing: China Communications Press, 2013: 13-19 (in Chinese).
[5] TAN K L, LI C X, MENG H, et al. Preparation and characterization of thermoplastic elastomer of poly (vinyl chloride) and chlorinated waste rubber[J]. Polymer Testing, 2009, 28(1): 2-7.
[6] LIN P, HUANG W D, TANG N P, et al. Understanding the low temperature properties of Terminal Blend hybrid asphalt through chemical and thermal analysis methods[J]. Construction and Building Materials, 2018, 169: 543-552.
[7] 牟东兰,杨冰,韩迎春,等.次氯酸钠对硫化橡胶粉表面的氧化改性研究[J].化学研究与应用,2010,22(2):244-247.
MOU D L, YANG B, HAN Y C, et al. Study on sodium hypochlorite surface oxidation of vulcanized rubber powder[J]. Chemical Research and Application, 2010, 22(2): 244-247 (in Chinese).
[8] 丁国新,程国君,杨小龙,等.废胶粉的表面处理及在天然橡胶中的应用[J].材料科学与工程学报,2011,29(6):949-953.
DING G X, CHENG G J, YANG X L, et al. Surface treatment of waste rubber powder and its application in natural rubber[J]. Journal of Materials Science and Engineering, 2011, 29(6): 949-953 (in Chinese).
[9] 刘超锋,张普香,王振宝.废橡胶细胶粉的应用研究进展[J].合成橡胶工业,2006,29(5):392-396.
LIU C F, ZHANG P X, WANG Z B. Advance in application of fine rubber powder from waste rubber[J]. China Synthetic Rubber Industry, 2006, 29(5): 392-396 (in Chinese).
[10] KRL J B, RADZISZEWSKI P, KOWALSKI K J, et al. Laboratory and field investigations of polymer and crumb rubber modified bitumen[J]. Journal of Civil Engineering and Architecture, 2014, 8(10): 1327-1334.
[11] YAN K Z, CHEN J H, YOU L Y, et al. Characteristics of compound asphalt modified by waste tire rubber (WTR) and ethylene vinyl acetate (EVA): conventional, rheological, and microstructural properties[J]. Journal of Cleaner Production, 2020, 258: 120732.
[12] LIU Y M, ZHENG M L, LIU X, et al. Conventional, thermal and rheological properties of asphalt binder modified by carbon nanotubes (CNTs) and crumb rubber (CR)[J]. Journal of Materials in Civil Engineering, 2021, 34(2): 04021446.
[13] 白雪.废橡胶再利用:新目标对表“中国制造2025”[N].中国经济导报,2017-2-10:B06版.
BAI X. Reuse of waste rubber: a new target for “Made in China 2025”[N]. China Economic Herald, 2017-2-10: B06 (in Chinese).
[14] 杨志峰,李美江,王旭东.废旧橡胶粉在道路工程中应用的历史和现状[J].公路交通科技,2005,22(7):19-22.
YANG Z F, LI M J, WANG X D. The history and status quo of rubber powder used in road building[J]. Journal of Highway and Transportation Research and Development, 2005, 22(7): 19-22 (in Chinese).
[15] CHENG G, SHEN B, ZHANG J. A study on the performance and storage stability of crumb rubber-modified asphalts[J]. Petroleum Science and Technology, 2011, 29(2): 192-200.
[16] 毛远.微波胶粉改性沥青的研究[D].上海:华东理工大学,2013.
MAO Y. Study on waste crumb rubber modified asphalt process[D]. Shanghai: East China University of Science and Technology, 2013 (in Chinese).
[17] 王坤,康永.废胶粉表面微生物脱硫及其改性沥青的性能研究[J].橡塑技术与装备,2017,43(3):58-62.
WANG K, KANG Y. Study on the performance of waste rubber powder surface microbial desulfurization and modified asphalt[J]. China Rubber/Plastics Technology and Equipment, 2017, 43(3): 58-62 (in Chinese).
[18] MEMON G M, CHOLLAR B H. Catalytic process for producing free radicals on crumb rubber: US5762700[P]. 1998-06-09.
[19] SHATANAWI K M, BIRO S, GEIGER A, et al. Effects of furfural activated crumb rubber on the properties of rubberized asphalt[J]. Construction and Building Materials, 2012, 28(1): 96-103.
[20] SHATANAWI K M, BIRO S, NASER M, et al. Improving the rheological properties of crumb rubber modified binder using hydrogen peroxide[J]. Road Materials and Pavement Design, 2013, 14(3): 723-734.
[21] 于凯,王欢,韩赫兴,等.双氧水氧化废轮胎胶粉在改性沥青中的应用[J].天津大学学报(自然科学与工程技术版),2014,47(11):949-954.
YU K, WANG H, HAN H X, et al. Hydrogen peroxide oxidizing modification of crumb tire rubber and its application in modified bitumen[J]. Journal of Tianjin University (Science and Technology), 2014, 47(11): 949-954 (in Chinese).
[22] 于凯,张琛,王欢,等.次氯酸钠氧化废轮胎胶粉对改性沥青性能的影响[J].环境工程学报,2016,10(1):350-354.
YU K, ZHANG C, WANG H, et al. Influence of sodium hypochlorite oxidization of crumb tire rubber on performance of modified bitumen[J]. Chinese Journal of Environmental Engineering, 2016, 10(1): 350-354 (in Chinese).
[23] 中华人民共和国交通运输部.公路工程沥青及沥青混合料试验规程: JTG E20—2011[S].北京:人民交通出版社,2011.
Ministry of Transport of the People’s Republic of China. Highway engineering asphalt and asphalt mixture test regulations: JTG E20—2011[S]. Beijing: People’s Communications Press, 2011 (in Chinese).
[24] 中华人民共和国交通部.公路沥青路面施工技术规范:JTG F 40—2004[S].北京:人民交通出版社,2005.
Ministry of Communications of the People’s Republic of China. Technical specification for highway asphalt pavement construction: JTG F 40—2004[S]. Beijing: People’s Transportation Press, 2005 (in Chinese).