Lube-Tech
monomers such stearyl methacrylate, methyl methacrylate, different alkyl acrylates (methyl/decyl/ dodecyl acrylates), different α-olefins (α-pinene, 1-dodecene, 1-hexadecene, 1-octadecene) were reported as efficient multifunctional additives in biolubricants. Copolymers of sunflower, soybean, castor or waste cooking oils with stearyl methacrylate act as pour point depressants, viscosity index improvers, and rheology modifiers for the N-150 base oil. The backbone of stearyl methacrylate makes the copolymer a better pour point depressant due to extensive crosslinking and branched network. Homopolymers of rice bran oil and its copolymers with dodecyl acrylate, styrene, and stearic acid have potential multifunctional performance especially as antiwear agents. All these polymers were synthesised by free radical polymerisation method using benzoyl peroxide or AIBN initiator. Thermal and microwave irradiation both methods have been applied to synthesise the polymers. Few polymers were
PUBLISHED BY LUBE: THE EUROPEAN LUBRICANTS INDUSTRY MAGAZINE
No.143 page 6
synthesised by ATRP method also to produce additives having desirable performances.
The addition of different organic or inorganic nanofillers during polymerisation has noticeable impact towards increase in additive performance and thermal stability. It was reported that organic nano particles such as nanocellulose, nano graphene, carbon nanotube and different inorganic and metallic nano particles like zinc, boron and iron. significantly enhanced antifrictional properties when introduced in the macro-structure of a vegetable oil based polymer. But due to problems associated with the dispersibility of metallic nanomaterials in bio-based oils, organically modified/layered nano metals have become very popular recently. The nano particles introduced in the macrostructure of the polymers help the lubricant to bind with the metal surface more strongly and therefore reduce friction significantly. These polymerisation reactions are shown in Fig 2.
Figure 2: Polymerisation and preparation of polymer composites of VO.
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LUBE MAGAZINE NO.172 DECEMBER 2022
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