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A technology of lubricating oil composition and diesel engine, applied in the directions of lubricating composition, petroleum industry, additives, etc., can solve problems such as piston cleanliness without special concentration
Inactive Publication Date: 2013-02-20
壳牌润滑油日本株式会社
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It attempts to provide increased viscosity and acid number in this low ash oil without particularly focusing on piston cleanability
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Embodiment 1
[0121] Example 1 did not contain any metal detergent. Succinimide-3 ashless dispersant gives 0.15wt% nitrogen, amine-based antioxidant gives 0.08wt% nitrogen, and succinimide-based dispersant gives 0.047wt% boron, while ZnDTP A Zn amount of 0.10 wt% is given, so that the parameter Zn amount x (nitrogen amount of succinimide+nitrogen amount of amine-based antioxidant) has a value of 0.023, and a TGF of 12% and cam tip wear of 7 μm. In addition, the sulfate ash content is 0.23 wt%, which satisfies the standard, so that satisfactory performance has been obtained.
Embodiment 2
[0122] Example 2 does not use metal detergent. The point is that the total nitrogen content of the mixture of succinimide-1, succinimide-2 and succinimide-3 gives a total nitrogen content of 0.12 wt%, and thus the parameter value is 0.020. The TGF is 12%, and the cam tip wear is 18 μm, which means that satisfactory performance has been achieved.
Embodiment 3
[0123] For Example 3, the nitrogen content of succinimide was 0.15 wt%, and it was a mixture of succinimide-1 and succinimide-2. The Zn amount is 0.1 wt%, and the amine-based antioxidant gives a nitrogen amount of 0.0396 wt%, which means that the parameter value is 0.019. The TGF value was 9% and the cam tip wear was 24.7 μm.
[0124] As in Example 4, when the nitrogen content of the amine-based antioxidant is 0.022wt%, the parameter value is 0.015, TGF is 7% and cam tip wear is 84.9 μm, but this is within the range of satisfactory performance.
[0125] On the other hand, for Comparative Example 1, the succinimide-based dispersant gave a nitrogen amount of 0.075 wt%. In addition, the amount of Zn was 0.077wt%, and no amine-based antioxidant was added, so that the parameter value was significantly reduced to 0.006, the TGF was 47%, and the cam tip wear was significantly increased. In Comparative Example 2, the amount of nitrogen from the succinimide-based dispersant was 0.12 ...
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Abstract
Lubricating oil composition for use in diesel engines which comprises, in the base oil, not more than 0.3% by mass of sulphated ash, from 0.01 to 0.2% by mass of nitrogen in succinimides, from 0.05 to 0.12% by mass of zinc in zinc dithiophosphates, from 0.02 to 0.3% by mass of nitrogen in amine-based anti-oxidants, and from 0.01 to 0.08% by mass of boron, which further has a total value of [(zinc amount in zinc dithiophosphates) x (nitrogen amount in succinimides)] and [(zinc amount in zinc dithiophosphates) x (nitrogen amount in amine-based anti-oxidants) ] as regards the aforementioned of from 0.015 to 0.06, and which does not contain salicylate, phenate or sulphonate metallic detergents. The intention is to obtain a lubricating oil composition for use in diesel engines which does not contain a metallic detergent yet maintains excellent engine (piston) detergency while preventing DPF clogging, and which reduces valve-train wear.
Description
technical field [0001] The present invention relates to a lubricating oil composition for a diesel engine, and in particular to a lubricating oil composition for a diesel engine which has very good engine (piston) cleanability while having ultra-low ash although it does not contain metal detergents. Background technique [0002] Diesel particulate filters (hereinafter referred to as DPF) are considered to be an effective method for removing particulate matter (hereinafter referred to as PM) from diesel engine exhaust gas, but they may experience filter of the jam. For example, it is known that ash derived from diesel oil will accumulate in DPF, which will lead to lower PM removal efficiency and shorter DPF life, so it is considered necessary to reduce sulfated ash in diesel oil, in other words, the ash content must be reduced . [0003] This means that engine oils and especially diesel oils have a history of changes due to fuel changes. For example, air pollution due to p...
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