Oven oxidation test 250mL beaker plus 109 test oil, the polished 45th steel sheet and the bottom of the cup into 30 test oil, the beaker is placed in an oven at a constant temperature of 135 Â° C, 72h, then the steel sheet is taken out and rinsed with petroleum ether. Observe the discoloration of the steel sheet and the sediment at the bottom of the cup. Steel sheet rating: public, a steel sheet does not change color 1 - slightly discolored, almost the same as the new film 2 - partial light white 3 - most pale white 4 - with gray, blue, yellow or gray and white colors 5 - partial gray black, Peeling measurement item: a. Wear spot diameter; b. Observe the wear spot morphology. Grinding surface topography rating: smooth, light scratches (<3 strips) b-surface smooth, light scratches (>3 strips) rough, heavy scratches, edges are not neat d-glue.
The simulated L-33 test adopts the liquid phase rust D665 test method, and the sample is placed in an oven at a constant temperature of 80 Â° C, the 164 ho test oil amount is 30 mL; the distilled water volume is 30 mL; the evaluation item is to observe the number of days of the first occurrence of rust spots, and observe at the same time Corrosion of gas phase, oil phase and water phase, ie no rust, light rust, medium rust, heavy rust, and pH value of the aqueous phase is measured by pH test paper.
The selected pour point depressant was evaluated for high and low temperature performance of the oil. The results are shown in 5. It can be seen from 5 that the combination of pour point depressant l and pour point depressant 4 deteriorates the low temperature performance of the oil; adding pour point depressant 2 or pour point depressant 3, the high and low temperature performance of the oil meets the requirements of the index, and can meet the requirements. The base oil of the 80W/90 (GL-5) vehicle gear oil. Infrared spectrum analysis of foreign compounding agents At present, the foreign complexing agents mainly include Anglamol6o44A, 6044B, 6055, Hitee370, and their main absorption peaks of infrared spectrum and their attribution are listed in 6.
Performance evaluation of foreign compounding agent The foreign compounding agent was added to 80W/90 (GL-5) base oil at the recommended dosage to simulate L-37 test. The result is shown in 7. It can be seen from 9 that the solubility of phosphorus-containing agent B and phosphorus-containing agent C is much larger than that of thioene and phosphorus-containing agent A. Phosphorus-containing agent A also increases in hydrolysis with increasing dose, and thioene does not substantially hydrolyze. . Performance of sulfur-containing agent The most used sulfur-containing agent in modern vehicle gear oil is sulfurized olefin. Sulfurized olefin can effectively prevent tooth surface damage under high-speed impact. The analysis of the representative additive Hitee37o, such as glamol6oss, 7205, Sulfurized olefins account for 50 to 60.
The evaluation was carried out using imported thioene and domestic thioene. The results are shown in 10. It can be seen from 7 that Hitee 370, 7205, 6085 have the best anti-wear performance, and 60 K have the worst anti-wear performance. The formulation was developed with reference to the composition of the 6085 and 7205 composites. Composite effect of sulfur-containing phosphorus extreme pressure agent The extreme pressure and wear resistance of vehicle gear oil must pass the high-speed low-torque, low-speed, high-torque CRC-L-37 test and the high-speed impact CRC-L-42 test. At present, the passing rate of the L-37 and L-42 stands is only about 37, and the cost is high.
Phosphorus is a key element in the protection of the tooth surface. The gear oil tested by the GL-5 specification contains phosphorus in the formulation. The mask formed by the sulfur-containing agent exhibits a high extreme pressure under high-speed impact conditions, but is completely ineffective under low-speed and high-torque conditions, and even causes severe wear. The mask produced by the phosphorus agent has the best extreme pressure under low speed and high torque conditions, but has poor performance under high speed impact conditions. The combination of sulfur and phosphorus can solve this contradiction. The proper ratio of sulfur to phosphorus is important, and improper ratio of sulfur to phosphorus will cause the gear oil formulation to lose balance and fail. The test results are shown in the evaluation results of extreme pressure 10 sulfurized olefins of different sulfur phosphorus t gear oil formulations. Item 123 Appearance Orange red light orange viscosity (10 Â° C).
Hydrolysis Stability of Sulfur Phosphors The hydrolytic stability of additives directly affects the oxidation stability of oils, the corrosiveness of oils, and the extreme pressure and abrasion resistance. To improve the extreme pressure and anti-wear properties and oxidation stability of oil products, the hydrolysis stability of oil products should be investigated first. The hydrolysis stability of several additives is shown in 9. The addition of thione to humans, the addition of 1 sulfene olefins. It can be seen from 1 that the sulfene olefins should be added in an amount of more than 30 in 80w/90 (GL-5) vehicle gear oil.
The composite effect of phosphorus-containing agents The role of phosphorus-containing agents is to prevent tooth surface wear, pitting and spalling under low-speed, high-torque, harsh operating conditions. The chemical structure of the phosphorus-containing agent determines its activity. The gear oil formulation has certain complexity. If the activity of the phosphorus-containing agent is too low, it is difficult to participate in the competition between the additives and the tooth surface reaction film formation, and the tooth surface cannot be effectively protected. Too high will cause severe flank corrosion.
Antioxidant and anti-rust properties. Sulfurized olefins have certain oxidation stability. The anti-rust agent in 80w/90 (GL-5) vehicle gear oil formula is generally a clean dispersant. The combination of the two can improve the oxidation stability of the oil. It is not necessary to add an antioxidant to pass the L-60 oxidation test. Extreme pressure anti-wear agents are generally acidic and highly corrosive, and rust inhibitors must be added. Commonly used rust inhibitors are: sulfonate, butyl succinimide, alkenyl succinate and the like. The alkali sulfonate neutralizes the organic acid produced by the additive in the oxidation process of the oil, which has both clean dispersion and outstanding rust resistance.
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