Fatty sorbitan ester based friction modifiers
A technology of sorbitan, friction modifier, applied in the directions of additives, lubricating compositions, petroleum industry, etc., can solve problems such as deterioration of lubricants, reduction of effectiveness, etc.
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Embodiment 1
[0171] Embodiment 1-preparation of sorbitan fatty acid ester
[0172] Sorbitan fatty acid esters were prepared under the following parameters.
[0173] Case 1
[0174] Excess 1,4-sorbitol was reacted with tallow fatty acid (TFA) in the absence of catalyst under mild conditions for 12 hours using a single-step apparatus. TFA, Industrene 143 was charged into the 1,4-sorbitol, Sorbitol 9033 at a molar ratio of Sorbitol:TFA of 6:1. The reaction was maintained at 180°C for 12 hours. By monitoring 1739.6cm -1 (tallow-sorbitan fatty acid ester) and 1704cm -1 The FT-IR absorbance at (tallow fatty acid) was used to characterize the yield. Although not typical of commercial processes, mainly monoesters are formed.
[0175] Case 2
[0176] The reaction of Case 1 was repeated at a higher TFA content - 1:1 sorbitol:TFA molar ratio. The resulting product contains a higher concentration of diester - at least 25% or more.
[0177] Case 3
[0178] The acidic catalyst was used for 6 h...
Embodiment 2
[0189] Example 2 - Friction Reducing Capability of TSE Compositions of the Invention
[0190] Basestock, Excell 100HC was blended with TSE Compositions A, B and C at 500 parts per million based on the total parts per million of the basestock. Composition A contains TSE. Composition B contained equal parts TSE and HXL 7121. Composition C contained equal parts TSE and HXL 7353. The results of the Cameron Plint friction test (coefficient of friction, ("CoF"), data) are shown in Table 1 individually, for Excell 100HC, TSE, HXL 7121 and HXL 7353; and for combinations A, B and C of the present invention.
[0191] Table 1
[0192]
[0193] The friction reducing capabilities of TSE and various other additives at different temperatures are shown in Table 1. In a preferred embodiment, the sorbitan fatty acid ester (without additional additives) in the respective lubricant composition reduces the coefficient of friction as measured at a temperature less than or equal to 80°C At lea...
Embodiment 3
[0196] Example 3 - Controlled Release of TSE Compositions of the Invention
[0197] figure 2 An exemplary system 100 for evaluating the release rate of a friction modifier composition into a base stock is shown in . A TSE composition 102 prepared in accordance with the present invention was contained in a Whatman-42 filter paper folded bag 104 . The bag 104 is placed in a base stock 106, such as a Group III base oil, heated to 95° C. using a heating element 108 while stirring with a stir bar 110 to simulate lubricant flow through a filter paper bag. Base stock 106 was maintained at 95°C with continuous agitation for 5 hours. Lubricant compositions were analyzed by Fourier transform infrared spectroscopy (FT-IR). The weight of the friction modifier was measured at the time intervals described below by removing the bag and patting the package dry with a Kim wipe towel, followed by weighing the bag. The results of the tests are shown in Table 2.
[0198] Table 2
[0199] ...
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Abstract
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