Page 54 - 《橡塑技术与装备》英文版2025年12月

HINA R&P TECHNOLOGY AND EQUIPMENT

The impact of hexadecylamine on the desulfurization

degree of waste rubber and the application of rubber

asphalt

1
1
Jin Yushi , He Hongwei , Ma Jie , Cui Chen , Zhang Bo 2
1
1
(1. Taiyuan University of Technology, Taiyuan 030024, Shanxi, China;
2. Shanxi Transportation Science and Technology Research and Development Co. LTD., Taiyuan 030032,
Shanxi, China)
Abstract: With the rapid development of the transportation industry, the production of waste rubber
(CR) has been increasing year by year. However, there is currently a lack of environmentally friendly and
efficient recycling methods. Due to the inert surface and internal three-dimensional network structure of CR,
the recycling and reuse process is hindered. Therefore, the desulfurization of CR through de-crosslinking has
become a highly promising research direction. This article employs a Haake internal mixer to blend waste
rubber powder with a desulfurizing agent (HDA) to investigate the effects of different process parameters
and HDA on the desulfurization efficiency of rubber powder. By analyzing the influence of different mixing
temperatures, speeds, and desulfurizing agent contents on the degree of chloroprene rubber (CR)
desulfurization through sol content, Horikx curve, and scanning electron microscopy (SEM), and applying it to
modified asphalt, good results have been achieved.
Key words: hexadecylamine; rubber powder desulfurization; rubber powder modified asphalt
Classification number: TQ330.56 Article number: 1009-797X (2025)12-0048-07
Document code: B DOI: 10.13520/j.cnki.rpte.2025.12.011

With the rapid economic development in recent years, powder, CMA also exhibits high economic efficiency.
waste tires have become a derivative of economic growth. The surface of ordinary rubber powder is inert and has
According to statistics, China produces approximately 330 poor compatibility with asphalt. Long-term storage can lead
million waste tires annually, with a total weight exceeding 10 to phase separation between CR and asphalt, resulting in a
million tons. These waste tires are difficult to decompose under decline in the performance of CMA, which in turn affects its
natural conditions, and long-term storage not only releases widespread application. Desulfurization of rubber powder
pungent and toxic gases but also easily leads to fires. They selectively breaks the S-S bond, S-C bond, and C-C bond,
contain harmful heavy metal elements such as lead, chromium, partially restoring the original rubber properties to enhance the
and cadmium, which, if not disposed of properly, can pose compatibility of CR with asphalt and optimize the performance
significant threats to human health and the natural environment. of CMA. Therefore, this paper combines thermomechanical
Traditional incineration and landfill disposal methods not
only consume a lot of energy but also bring about a series of Biography: Jin Yushi (1999-), master's degree candidate, whose main
environmental issues. Recycling these waste tires into rubber research direction is the study of green new materials and multifunctional
materials.
powder and then applying it to modified asphalt can increase
Project Funds: Major Science and Technology Special Project of
the consumption of these "black pollutants". This makes rubber Shanxi Province, "Posting a Challenge and Taking the Lead" Project
powder modified asphalt (CMA) highly environmentally (202201090301014); Joint Funding Project of Shanxi Provincial Basic
Research Plan (202303011222003)
friendly, and due to the relatively low price of waste rubber

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