One‐Pot Synthesis and Tribological Properties of Oil‐Containing Self‐Lubricating Polyurethane Materials

Abstract

In this work, polyurethane (PU) materials containing paraffin oil are successfully prepared via an emulsion template method, which realizes the one‐pot preparation of self‐lubrication materials. The results show that the block copolymer surfactant (PEG20‐PPG70‐PEG20, P‐123) can stabilize the nonaqueous PU emulsion with the paraffin oil serving both as dispersed phase of oil in oil emulsion and as a lubricant in the materials, and hence enables the fabrication of oil incorporating PU materials accordingly. Tribological tests show that the friction coefficient of PU material with 35% paraffin oil decreases to 0.05 which account for 93.06% reduce compared to that of pure PU.

Simultaneously enhancing tribological and mechanical properties of epoxy composites using basalt fiber/reduced graphene oxide/paraffin wax

“…For one thing, the PW can absorb frictional heat during its phase transition process, therefore maintaining the excellent mechanical properties of EP. For another, the as‐resulted liquid paraffin can lubricate the friction system, transforming the dry friction into semi‐dry friction 40 . Most notably, a minimum COF is found for the EP/BF/RGO/PW(1:3) with a mean COF of 0.16.…”

“…For another, the as-resulted liquid paraffin can lubricate the friction system, transforming the dry friction into semi-dry friction. 40 Most notably, a minimum COF is found for the EP/BF/RGO/PW(1:3) with a mean COF of 0.16. It is strange to find a longer running-in period for EP/BF/ RGO/PW(1:1), perhaps due to the inefficient lubrication on account of the small content of PW and the uneven dispersion of PW in the contact surface.…”

Microvesicle-Embedded Solid–liquid Composite Coating for the Tribological Behavior Regulation and Long-Acting Lubrication

“…For instance, Li et al developed a composite coating by incorporating strong linseed oil-filled porous glass bubble/wax microcapsules into epoxy resin, achieving high mechanical strength but a relatively higher friction coefficient. Introducing “free” liquid lubricant droplets directly into the resin phase has demonstrated the potential for achieving even lower friction coefficients. , Our previous research involved the development of polyurethane solid–liquid composite coatings, which incorporated free methyl silicone oil (MSO) droplets and obtained an extremely low friction coefficient of 0.009, but clearly exhibited low load-bearing capacity and wear life . The adverse effects were predominantly caused by mechanical weakening of the substrate due to phase separation and droplet agglomeration (Figure aII).…”

Fully Automated Multi-Step Synthesis of Block Copolymers

“…Due to high variability in composition and properties, block copolymers enable a wide range of potential applications. Amphiphilic block copolymers are applicable as surfactants [3,4] and pigment dispersants [5]. Furthermore, copolymers containing, e.g., poly(ethylene oxide) as hydrophilic block and poly(L-amino acid) as hydrophobic block, can aggregate in water to micelles [6].…”