Synthesis and Tribological Properties of Polyurethane Microcapsules Based on TDI and IPDI

doi:10.7503/cjcu20220444

Abstract

Abstract:

As a new material category being researched and developed in practical application， self-lubricating materials still have the ability to reduce degradation， provide lubrication effect and prolong the service life of materials after structural damage. In this paper， ionic liquid@polyurethane（PU） microcapsules were prepared by in⁃situ polymerization with toluene diisocynate（TDI） and isophorone diisocyanate（IPDI） as the monomer， respectively， and epoxy resin composites were prepared by blending ionic liquid@PU with epoxy resin. The surface morphology of the composite and microcapsule was analyzed by scanning electron microscopy. The mechanical and tribological properties of the microcapsule modified composite were investigated by electronic universal testing machine and friction and wear testing machine under different conditions. The microcapsules were characterized by Fourier transform infrared spectroscopy. The results show that the microcapsules with IPDI as the monomer had more excellent tribological performance， and with the increase of dosage of microcapsule， the tribological properties of the composite material increased significantly. When microcapsule adding amount was 20%， the microcapsule- containing composite material had a low friction coefficient of sliding friction and the surface was relatively smooth， This is because in the experimental process， with the damage of the microcapsule wall material， the ionic liquid of the core material is released， forming dense lubrication film.

Key words: Microcapsule, Self lubricating, Intelligent material, Tribological property

CLC Number:

O648.2

TrendMD:

ZHANG Rui, YANG Qi, CHEN Sijia, WANG Lijuan, ZHAO Zenghui, CUI Yuchao, TIAN Yuxuan. Synthesis and Tribological Properties of Polyurethane Microcapsules Based on TDI and IPDI[J]. Chem. J. Chinese Universities, 2023, 44(2): 20220444.

Figures/Tables 7

Table 1 Core content, yield and coating rate of the epoxy resin composite with different core-wall mass ratio [BMIm]PF6@PU microcapsules

Sample	η	$ω c o r e$ （%）	ψ（%）	γ（%）
1	1∶1	33.2±4.3	50.3±3.6	24.5±1.4
2	2∶1	50.1±4.5	42.6±3.5	21.7±1.1
3	3∶1	69.4±4.8	38.7±2.8	26.1±1.8
4	3∶2	54.5±4.6	52.1±3.3	20.7±1.5

Table 1 Core content, yield and coating rate of the epoxy resin composite with different core-wall mass ratio [BMIm]PF6@PU microcapsules

Sample	η	$ω c o r e$ （%）	ψ（%）	γ（%）
1	1∶1	33.2±4.3	50.3±3.6	24.5±1.4
2	2∶1	50.1±4.5	42.6±3.5	21.7±1.1
3	3∶1	69.4±4.8	38.7±2.8	26.1±1.8
4	3∶2	54.5±4.6	52.1±3.3	20.7±1.5

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