SU902672A3 - Lubricating composition - Google Patents

Abstract

The synthetic lubricant preparation contains as the base material a mixture of a liquid polyol ester and a liquid polyalpha -olefin. The polyol ester is derived from an aliphatic monocarboxylic acid and an aliphatic polyol having at least two methylol groups on a quaternary C atom. The preparation is suitable for transmissions and internal-combustion engines.

Description

elastomeric shutter i motor, which prevents leakage of lubricating oil, Characteristics of the swelling of the valve from Buna N when using different mixtures of trimethylolpropane triheptanoate ether and a mixture of decene oligomers are presented in table. 1, and their viscosity and pour point are given in table. 2, Lubricating compositions can be used in reciprocating motors with a more effective Tbroj since, if used, no swelling of the elastomer closures in reciprocating motors occurs, which is the case with known compositions. The shutter swell is defined as the amount in percent that increases the volume of the elastomeric shutter and the exposure against contact with lubricating oils during operation of the motors. N Sufficient or excessive swelling causes loss of the ability of the valves to preserve and collect motor oils. A leak occurs which causes a large consumption of the high-viscosity polyol ether selected from the group consisting of ditrimethylolpropane tetraesters and hexa-4mron dipentaerythrol and their mixtures mixed with n-oC-olefin oligomers, provides a basic substance with good viscosity characteristics. controlled shutter swelling. The resulting properties of a mixture of ditrimethylolpropane-tetraheptonoate and mixed decene oligomers in a 1: 1 ratio are as follows: Viscosity at 98.89 ° C cSt9.5 Pour point, ° C-40 Shutter swelling at 14 V, 89 s after 70 h,% 7 Main The system of the invention, which is a mixture of polyol-synthesized hydrocarbon oligomer ether, is compatible with additives of a harmless effect on the elastomeric gate of the motor. Typical additives for the ester mixture are usually those that impart anti-corrosion and anti-wear properties, resistance to load properties, lubricity, viscosity index of improved properties, detergency, dispersibility, metal deactivating properties, anti-foam properties, and the like. An important fact is the ability to disperse and to exhibit the wet properties of the additives that are compatible and: effective with respect to the main raw material mixture. This is due to the fact that the oxide motor gases pass through the piston rings and can therefore contaminate the crankcase lubricating oil. The ability to dispersion and detergent action of additives prevents corrosion and rust formation on bearings, and such additives are necessary additional substances to the main raw material for neutralizing, dissolving and dispersing these impurities, as well as for destroying fuel oxidation products. Example 1. Components of a lubricant composition,%: Hydrogenated mixture of trimers and tetramers of decene40 Trimethylolpropane trigeyanoat40 Methacrylate vinyl pyrrolidone copolymer. 9.5 Lubrizol 3826A (a mixture of dialkyldithiophosphate zinc, alkalized calcium alkylbenzene sulfonate, calcium phenate and including succinimide) 10.0 Phenyl alpha naphthylamine 0, 5 Benzotriazole 0.02 Silicone antifoam 25, 0 test chrctrc chyc lecht 3 evaluate engine oil crankcase lubricants for resistance to oxidation, corrosion, sludge and enamel formation, including when they are exposed to high temperature operation. The technique consists in the continuous operation of a single-cylinder CLR engine for evaluating oil at constant speed, air-fuel ratio and under constant fuel supply conditions for 40 hours, followed by stopping for 4.5 hours. Before each experiment, the engine is carefully wiped , a corresponding measurement of the motor parts is carried out and the new piston, piston rings and the new copper-lead connectors are mounted to the shaft bearing inserts. The main operating conditions of the engine in this assessment are as follows: Duration, h 40 Speed, rpm 5150 ± 25 Fuel flow rate, lb / h 4.75 ± 0, kg / h 0.45 The ratio of air to fuel I4, 0t0, Temperature outside the casing, C 200 +2 Difference between the temperature outside the casing and inside the casing, ° C 10 + 1 Temperature of the lubrication channel, s290 + 2 The load is set in such a way as to ensure proper flow at a certain air-fuel ratio. After completing the test, the motor is disassembled and the condition of the oil is assessed by visual inspection of the motor for the presence of deposits, for weight loss by copper-lead bearings, and, as a result of comparing the inspection data of the sample of used oil taken at periodic intervals with the inspection data of the fresh oil. Estimation of oil oxidation for the engine crankcase for 40 hours is as follows: Weight loss of the bearing, kg Top 16.6 Low 16.7 Total 33.3 For this experiment, the maximum weight loss is 40 mg. In such an experiment, stringent corrosion conditions are created for copper-lead rod joints to cix bearings. Usually, when using essential lubricating oils, i.e. those in which ether is the main raw material, experience is considered unsuccessful if weight loss occurs that exceeds the allowable maximum of 40 mg. The resulting loss in experience of 33.3 mg can be considered as valid & and it indicates that the liquid mixture used will not cause excessive bearing corrosion during actual operation of the 4-rotor. Inspection of sediment in the motor. This operation is a visual purity inspection that is evaluated in the range from 0 to 10.0. A score of 10.0 means purity. External napet suggests that there is a tendency to degradation of lubricating oil (shellac-like glaze is formed on metal parts). An assessment of the deposition of external deposits and dirt is presented in Table. 3

Scale Assessment

external plaque

Piston skirt

Valve Rocker Cover

Push rod cover

The wall of the cylinder. BRT net oil, 9.9 ny filter 10.0

Engine sump 9.9 sump

Crankcase Cover 9.9 Kräppka Carter9.9

Total external plaque

Oil analysis is presented in Table 4.

Table 3

shit

9.8 Valve rocker arms9, 9

i Valve housing

9.9komysla 9.9

Rod cover Tol9, 9

9.9

9.9

Crankcase

Total amount of grease 59.5

59.3

T a b, l and c, and 4

Neutralization number viscosity at

37.8C

98.9 ° C

Viscosity of the stripped oil at

98.9C% viscosity reduction

at 37.8 ° С 98.9С Oil consumption, h

1.87 2,903,223,57 3,77

362.4 344,9341,4334.0 330.5

75.89 73.1271.4770.40 69.57

71.55 Example 2. A lubricant mixture similar to Example 1 is subjected to a rigorous wear test at high temperature, which is a wire on a high-speed motor having 8 cylinders with a volume of 425 cubic meters (7000 cm) inches. The test period is 64 hours. The criterion for passing tests is an increase in viscosity over 40 hours less than 400% and a nose of a finger (fist) plus a lift less than 0.002 minus the maximum value and less than 0.001 minus the average wear value Total results motor tests are presented in Table. 5. Table 5 Clogging of oil. FilterFillow Evaluation of the formation of external skirt Piston skirt 9.6 Pusher 9.6 Antututor 9.6 Average 9.6 The deposition of external plaque and grams in the main areas are very

Oh oh

Oh oh

Oh oh

Claims (2)

10 small values for the hard type of operating conditions created in this test. Dn compare next-. It should be noted that minimum petroleum lubricating oils tend to form significantly more dirt and external deposits under equivalent conditions. Estimation of residuals on facial oil rings Top5.9 Low.8.3 Average 7.0 Wear: fist plus lift, in. Maximum value0, 0013 Minimum value 0.0003 Average value 0.0007 Weight loss by rod bearing, mg Rod 453.1 Rod 565.1 Average value 55.1 Number of abrasions (wear is shown in Table 6. Table 5. Note. There are no costs for oil than 4.53 (4.3 liters). In the annular section there is no blockage of the oil wiping piston ring. There are no sticking and dirty rings and lifts. From Table 6 it follows that the closures are in good condition without all the cables. degradation. Valves retain flexibility, space Valuable integrity and do not leak oil. 9 Example 3. A lubricant mixture similar to Example 1 is tested according to Ford Seguence, VC, which is designed to evaluate the ability of a lubricating oil to control and disperse harmful impurities, such like acid gases, individual carbon, highly oxygenated oxidation products, etc. These impurities cause the accumulation of dirt and scurf, which most likely occurs when the motor is subjected to various disruptions clean cycles that include idling, operation at. medium speed, high speed operation and engine stop. The test according to Ford Seguence VC is carried out on a Ford 8 cylinder engine with a cylinder capacity of 302 cubic inches. This test consists of four consecutive cycles of operation, each lasting 4 hours. In each of the cycles, the engine is subjected to separate periods of idling, operating at medium speed and operating at high speed, After the operational sequence of 4 cycles is completed, The engine is stopped for 8 hours, after which all operations are repeated. The test lasts only 192 hours. After the test is completed, the motor is completely disassembled, inspected and evaluated. The following results were obtained. Evaluation of purity 10.0 Average 1 assessment of formation of dirt (8.5 passes) 9.09 Assessment of plaque formation on the piston skirt (7.9 passes) 8.16 Average assessment of plaque formation (8.0 passes) 8.93 Obtained results testify to the ability of lubricating oil to disperse harmful impurities and keep the engine in clean operating conditions, as a result of which good engine performance is ensured in harsh operating conditions. Inspection of the shutter shows that it is in good condition and not degraded. Claims of an engine crankcase lubricant composition containing trimethylolpropane triheptanoate or ditrimethylolpropane tetraheptanoate, characterized in that, in order to improve the viscosity characteristics of the composition at high temperatures, it additionally contains a mixed rate in the following ratio of components, wt.%, Trimethylpheneer, and then: tetraheptanoate .40-66.7 Mixed detsen up to 100 Sources of information taken into account in the examination 1. US patent number 3600431, cl. 260-479, published. 1971. 2. US Patent. No. 3476685, cl. 252-46.7, publ. 1969 (prototype).