含硼共聚物：一类环保型润滑油添加剂

doi:10.3969/j.issn.2097-2806.2025.01.001

Abstract

Abstract:

Increasing environmental concerns about limiting harmful emissions has necessitated sulfur-and phosphorus-free green lubricant additives. Although boron-containing compounds have been widely investigated as green lubricant additives, their macromolecular analogs have been rarely considered yet to develop environmentally friendly lubricant additives. In this work, a series of boron-containing copolymers have been synthesized by free-radical copolymerization of stearyl methacrylate and isopropenyl boronic acid pinacol ester with different feeding ratios （S_n-r-B_m, n=1, m=1/3, 1, 2, 3, 5, 9）. The resulting copolymers of S_n-r-B_m （n=1, m=1/3, 1, 2, 3, 5） are readily dispersed in the PAO-10 base oil and form micelle-like aggregates with hydrodynamic diameters ranging from 9.7 to 52 nm. SRV-IV oscillating reciprocating tribological tests on ball-on-flat steel pairs show that compared with the base oil of PAO-10, the friction coefficients and wear volumes of the base oil solutions of S_n-r-B_m decrease considerably up to 62% and 97%, respectively. Moreover, the base oil solution of S₁-r-B₁ exhibits an excellent load-bearing capacity of （850±100） N. These superior lubricating properties are due to the formation of protective tribofilms comprising S_n-r-B_m, boron oxide, and iron oxide compounds on the lubricated steel surface. Therefore, the boron-containing copolymers can be regarded as a novel class of environmentally friendly lubricating oil macroadditives for efficient friction and wear reduction without sulfur and phosphorus elements.

Key words: friction and wear reduction, lubricant additives, boron-containing copolymers, polymerization

CLC Number:

TE624

Hua Xue, Fengchun Liang, Weili Yang, Qun He, Meirong Cai, Feng Zhou, Weifeng Bu. Boron-containing copolymers as environmentally friendly lubricant additives[J].China Surfactant Detergent & Cosmetics, 2025, 55(1): 1-11.

Figures/Tables 8

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References 33

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	n:m（feed ratio）	n':m'^a （actual monomer ratio）	M_n,SEC^b/kDa	Dispersity （?）^b	Hydrodynamic size^c/nm
S₁-r-B₀	1:0	1:0	88 300	1.18	34
S₁-r-B_1/3	3:1	0.12:1	75 600	1.40	31
S₁-r-B₁	1:1	1:1.0	43 000	1.56	18
S₁-r-B₂	1:2	1:1.3	31 300	1.85	9.7
S₁-r-B₃	1:3	1:1.9	34 300	1.84	26
S₁-r-B₅	1:5	1:3.1	39 400	1.47	52
S₁-r-B₉	1:9	1:4.8	38 900	1.46	—

Sample	Wear volume/μm³	Decreasing percentage /%
PAO-10	6 308 591	0
S₁-r-B₀	2 280 636	63.85
S₁-r-B_1/3	1 480 626	76.53
S₁-r-B₁	199 213	96.84
S₁-r-B₂	231 523	96.33
S₁-r-B₃	260 846	95.86
S₁-r-B₅	2 275 452	63.93

Boron-containing copolymers as environmentally friendly lubricant additives

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