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. 2021 Jul 6;13(14):2224.
doi: 10.3390/polym13142224.

Preparation and Properties of the Urea-Formaldehyde Res-In/Reactive Halloysite Nanocomposites Adhesive with Low-Formaldehyde Emission and Good Water Resistance

Jingbiao Song  1 , Shiwei Chen  1   2 , Xibin Yi  2 , Xinfu Zhao  2 , Jing Zhang  2 , Xiaochan Liu  2 , Benxue Liu  2
Affiliations

Preparation and Properties of the Urea-Formaldehyde Res-In/Reactive Halloysite Nanocomposites Adhesive with Low-Formaldehyde Emission and Good Water Resistance

Jingbiao Song et al. Polymers (Basel). .

Abstract

Low-cost urea formaldehyde resin (UF)/reactive halloysite nanotubes (HNTs) nanocomposite adhesive was prepared successfully via in situ polymerization. The HNTs were modified to improve its compatibility with polymer. The XRD and FTIR results showed that physical and chemical interaction between the HNTs and polymer resin influenced the structure of UF owing to the functional groups on the HNTs. It is found from SEM images that the modified HNTs could be dispersed uniformly in the resin and the nanocomposite particles were spherical. The performance experiment confirmed that thermal stability of nanocomposite increased largely, formaldehyde emission of UF wood adhesive reduced 62%, and water resistance of UF wood adhesive improved by 84%. Meanwhile, the content of HNTs on the nanocomposites could be up to 60 wt %. The mechanism of the nanocomposites based on the reactive HNTs was proposed. The approach of the preparation could supply an idea to prepare other polymer/clay nanocomposites.

Keywords: formaldehyde emission; halloysite; urea formaldehyde resin; water resistance.

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Conflict of interest statement

The authors declare no conflict of interest. The founding sponsors had no role in the design of the study; in the collection, analyses, or interpretation of data; in the writing of the manuscript, and in the decision to publish the results.

Figures

Figure 1
Figure 1
FTIR spectra of HNTs, TH-HNTs, UF, and UF-TH-20%.
Figure 2
Figure 2
XRD diffraction patterns of HNTs, TH-HNTs, UF, and UF-TH-20%.
Figure 3
Figure 3
SEM images of (a) HNTs; (b) TH-HNTs; (c) UF; (d) UF-H-20%, and (e) UF-TH-20%.
Figure 3
Figure 3
SEM images of (a) HNTs; (b) TH-HNTs; (c) UF; (d) UF-H-20%, and (e) UF-TH-20%.
Figure 4
Figure 4
TGA curves of UF and UF/HNTs nanocomposites.
Figure 5
Figure 5
DTA curves of UF and UF/HNTs nanocomposite.
Figure 6
Figure 6
Formaldehyde emission of plywood samples with the addition of UF nanocomposites.
Figure 7
Figure 7
Water resistance of plywood samples with the addition of UF nanocomposites.
Figure 8
Figure 8
The mechanism to the formation of UF/TH-HNTs nanocomposites.
See this image and copyright information in PMC

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