Antiwear copolymer and lubricant composition
A technology of lubricant composition and copolymer, which is applied in the field of copolymers, can solve problems such as difficulty in controlling viscosity, graft position and density cannot be controlled, and achieve good copolymerization reaction, improved wear performance and high performance
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Embodiment 1
[0088] 70 grams of methyl 10-undecenoate and 137 grams of 1-decene were charged to a 1 liter 4-neck round bottom flask. The reaction mixture was stirred with a C-stir bar, inertly blanketed with nitrogen and heated to 140°C. The monomer feed included 493 grams of C12-C15 methacrylate. The initiator feed was 9.4 grams of 2,2-bis(tert-butylperoxy)butane. Once the mixture reached the set point temperature, 7 hours of continuous monomer feed and 11 hours of continuous initiator feed were started. Residual monomer was measured by gas chromatographic analysis of the resulting polymer to ensure total monomer conversion. Residual amounts of unreacted alpha olefin monomer were removed by rotary evaporation at 100°C and pressure below 15 mm Hg.
Embodiment 2-13
[0090] Examples 2-13 were prepared in the same manner as in Example 1 except that the weight ratio of the monomers was changed according to Table 1. The alpha-olefin monomer is always fed first into the reactor, and the (meth)acrylate monomer and the initiator are added over a set period of time. Molecular weight and kinematic viscosity can be controlled using various monomer and initiator feed times or by using a larger alpha olefin fraction in the reaction mixture. For example, Examples 6 and 13 have the same reaction mixture. By changing the monomer feed time from 7 hours (Example 6) to 5 hours (Example 13), the kinematic viscosity increased from 206 cSt to 321 cSt, and this was also reflected in the change in weight average molecular weight from 9400 g / mol to 14700g / mol.
[0091] The amount of alpha olefin in the reaction mixture also significantly affects molecular weight and kinematic viscosity. This is also depicted in figure 2 and 3 middle. As the amount of alph...
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