Preparation and characterization of urea-formaldehyde resin/reactive kaolinite composites--颗粒学报PARTICUOLOGY

Chen, S., Lu, X., Wang, T., & Zhang, Z. (2016). Preparation and characterization of urea-formaldehyde resin/reactive kaolinite composites. Particuology, 24, 203-209. https://doi.org/10.1016/j.partic.2015.05.007

Preparation and characterization of urea-formaldehyde resin/reactive kaolinite composites

Shiwei Chen^{a b}, Xuchen Lu ^{a c *}, Tizhuang Wang ^a, Zhimin Zhang ^a

a State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
b University of Chinese Academy of Sciences, Beijing 100049, China
c United Research Center for Resources and Materials, Wuhai 016000, China

10.1016/j.partic.2015.05.007

Volume 24, February 2016, Pages 203-209

Received 7 January 2015, Revised 28 May 2015, Accepted 30 May 2015, Available online 26 September 2015, Version of Record 21 January 2016.

E-mail: xclu@ipe.ac.cn

Highlights

• UF composites containing 20–40 wt% reactive kaolinites were prepared by in situ polymerization.

• The thermal stability of the urea-formaldehyde resin was improved.

• The formaldehyde emission was reduced and water resistance was improved.

Abstract

Novel urea-formaldehyde resin/reactive kaolinite composites containing 20–40 wt% kaolinite were prepared by in situ polymerization. The kaolinite was modified with tetraethoxysilane and a silane coupling agent to introduce reactive groups. Fourier-transform infrared spectroscopy and X-ray diffraction confirmed preparation of the urea-formaldehyde resin/reactive kaolinite composites. The composite morphology was investigated using scanning electron microscopy; the composites consisted of uniform spherical particles. The surface chemical components of the composites were determined using energy-dispersive X-ray spectroscopy. The spectra showed that the reactive kaolinite was encapsulated by the urea-formaldehyde resin. The thermal properties of the composites were examined using differential scanning calorimetry and thermogravimetric analysis. The results showed that their thermal stability was much better than that of pure urea-formaldehyde resin. Reactive kaolinite addition greatly decreased formaldehyde emissions and improved the water resistance of the composites. A mechanism for urea-formaldehyde resin/reactive kaolinite composite synthesis is proposed.

Graphical abstract

Keywords

Composites; Reactive kaolinite; Urea-formaldehyde resin; Morphology; Thermal property

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