Preparation of Ceramic Fiber Threads with Enhanced Abrasion Resistance Performance

Abstract

Ceramic fiber thread is one of the key components in flexible external thermal insulation blankets, and it has been applied in various fields as a flexible ceramic fibrous material with excellent deformability and high-temperature resistance. However, ceramic fiber threads are often subjected to reciprocating friction motion at specific bending angles, making them highly susceptible to abrade and fracture. Enhancing the abrasion resistance performance of ceramic fiber threads under bending conditions is the future trend and remains a significant challenge. Hence, we design and construct a novel polyurethane-modified coating on the ceramic fiber threads to improve their abrasion resistance performance. The effects of the types and concentrations of modifiers on the microstructure, abrasion resistance property, and tensile property of ceramic fiber threads are systematically investigated. The ceramic fiber threads, after modification with hexamethylene diisocyanate waterborne polyurethane (HDI-WPU) with a concentration of 3%, exhibit excellent abrasion resistance properties. The number of friction cycles at fracture of the modified ceramic fiber thread is more than three times, and the tensile strength is more than one and a half times, that of the original ceramic fiber thread, demonstrating the great potential of the HDI-WPU modifier for enhancing the abrasion resistance performance of ceramic fiber threads.

Reducing High-Molecular-Weight Oligomers in Biobased Pentamethylene Diisocyanate Trimers

“…The basic building block of PU is the carbamate group, which is formed through the additional polymerization of isocyanates with diols or polyols . Owing to their excellent wear resistance, toughness, mechanical strength, corrosion resistance, and processability, − they are widely employed in various fields, including coatings, , adhesives, , fibers, , thermoplastics, , thermosetting materials, , biomimetic materials, , and nanocomposites. , Commonly used polyisocyanates include aromatic and aliphatic isocyanates, such as toluene diisocyanate (TDI), diphenylmethane diisocyanate (MDI), and hexamethylene diisocyanate (HDI), which are derived from fossil feedstocks. − However, with the increasing global demand for PU, traditional polyisocyanates are facing challenges caused by decreasing fossil resources and increasing environmental pollution. New biobased isocyanates have attracted widespread attention from researchers and industries because of their high biochar content.…”