Dibutyl Phosphite Research Articles

Industrial gear oil — a study of the interaction of antiwear and extreme-pressure additives

The load-carrying capacity of a base oil containing antiwear and extreme-pressure additives, sulphurized olefin (SO), dibutyl phosphite (DBP) and a thiophosphate-amine complex (SPN) was evaluated using a Timken Tester. The roughness and chemical composition of the rubbing surfaces were measured at different sliding times. A static oil immersion test of oil and steel block was carried out and the bonding strength of the protective film formed in the oil immersion test was investigated using a scratch tester. Results indicate that even with a very small amount of DBP blending with SO, a much higher Timken OK load could be obtained. The rubbing surface roughness of SO combined with DBP was much smoother than that of the SO or DBP oil alone. The scratch test of the block after immersion in the lubricant in static showed that with the combination of SO with DBP, a high-strength protective film on the steel block could be produced.

β‐Benzotriazolylethyl phosphates and phosphonic esters

Abstractβ‐(1‐Benzotriazolyl)ethyl dibutyl phosphate and the 2‐benzotriazolyl analog were prepared from dibutyl phosphite and 1‐ and 2‐(β‐hydroxyethyl)benzotriazoles, respectively. Dialkyl β‐(N‐benzotriazolyl) ethylphosphonates were prepared from the corresponding dialkyl β‐bromoethylphosphonates. In both types of compounds, elimination of benzotriazole occurs in base; interestingly, such elimination is significantly faster in each series for the 2‐substituted benzotriazole than for the corresponding 1‐isomer.

Effects of additives on friction and wear behaviour of Cr 2O 3 coatings

The effects of several lubricating oil additives on the friction and wear properties of Cr 2O 3 coatings were studied using a block-on-ring tester under ambient conditions. The results show that, compared with the base oil, oleic acid, glycol oleate and dibutyl phosphite have a friction-reducing function but sulphurized olefin does not; a remarkable wear resistance is observed for dibutyl phosphite and oleic acid but not for glycol oleate and sulphurized olefin. The concentration of these additives has a great influence on the wear behaviour of the Cr 2O 3 coating but little influence on the friction behaviour. Analytical results of X-ray photoelectron spectroscopy show that the antiwear action of dibutyl phosphite is due to the formation of tribochemical reaction films on the rubbing surface and that the wear-increasing action of sulphurized olefin may be related to the physical adsorption of this additive and its decomposed products on the rubbing surfaces.

Spectroscopic study of compounds with P-H bonds 1. Dibutyl- and diisobutyl phosphites

1. In the vibrational spectra of dibutyl and diisobutyl phosphite (DBP and DIBP respectively), variations in medium, temperature, and phase state give rise to concurrent intermolecular interactions and conformational effects which are reflected in the frequencies and integral intensities of ν(P-H) and ν(P=O). 2. In the series dimethyl phosphite, diethyl phosphite, DBP, and DIBP the conformational equilibrium shifts in the direction of less gauche-gauche molecules, the dipole-dipole association is reduced and the proton-donor ability of the P-H group in a hydrogen bond is increased.

A study on the antiwear behaviour of S-P-type gear oil additives in four-ball and falex machines

We report the results of a controlled experiment using both Falex and four-ball antiwear tests. The tested oils, containing sulphurized isobutylene (SO) and dibutyl phosphite (DBP), show distinct antiwear behaviour in the two kinds of test. Auger spectroscopy analysis indicates a common antiwear mechanism for the oils in both testers. The different antiwear behaviour is attributed to the effect of the specimen surface temperature on the phosphorus-type additive. It is assumed that at low temperature competing adsorption is the dominating effect for DBP while at higher temperature DBP acts as catalyst for the SO erosion of the friction surface.

Preparation of N,N‐Dibutyl‐9(10)‐dibutylphosphono‐octadecanamide by ultraviolet initiated addition of dibutyl phosphite to N,N‐dibutyloleamide

Preparation of N,N‐Dibutyl‐9(10)‐dibutylphosphono‐octadecanamide by ultraviolet initiated addition of dibutyl phosphite to N,N‐dibutyloleamide

Reaction of keto alcohols with organophosphorus compounds

1. 3-Ketoalkyl dialkyl phosphites were obtained by the reaction ofβ-keto alcohols with dialkyl chlorophosphites in the presence of a base. 2. A study was made of the reaction of 3-ketoalkyl dialkyl phosphites with sulfur and with nitrogen oxides. 3. Diethyl 3-ketobutyl phosphite was reacted with chloral and dibutyl 3-ketobutyl phosphite was reacted with acetyl chloride.

Use of oxidation-reduction systems for the initiation of 1-octene with carbon tetrachloride

1. Oxidation-reduction systems containing benzoyl peroxide and an organic reducing agent initiate addition and telomerization reactions of 1-octene with carbon tetrachloride at 25–45‡. The following were used as organic reducing agents: hydroxymethyl p-tolyl sulfone, triethanolamine, and dibutyl phosphite. 2. The use of additions of iron and copper compounds to the benzoyl peroxide — hydroxymethyl p-tolyl sulfone system makes it possible to increase the yields of products and to carry out the reaction at room temperature.

The detection of oil films between hypoid gear teeth using contact resistance measurements : R. B. Campbell and D. MacDonald. J. Inst. Petrol., 47 (1961) 365–374

We report the results of a controlled experiment using both Falex and four-ball antiwear tests. The tested oils, containing sulphurized isobutylene (SO) and dibutyl phosphite (DBP), show distinct antiwear behaviour in the two kinds of test. Auger spectroscopy analysis indicates a common antiwear mechanism for the oils in both testers. The different antiwear behaviour is attributed to the effect of the specimen surface temperature on the phosphorus-type additive. It is assumed that at low temperature competing adsorption is the dominating effect for DBP while at higher temperature DBP acts as catalyst for the SO erosion of the friction surface.

Anomalous Reaction of Allyl Bromide with Sodium Dibutyl Phosphite

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAnomalous Reaction of Allyl Bromide with Sodium Dibutyl PhosphiteWalter H. C. Rueggeberg, Jacob Chernack, and Ira M. RoseCite this: J. Am. Chem. Soc. 1950, 72, 11, 5336–5337Publication Date (Print):November 1, 1950Publication History Published online1 May 2002Published inissue 1 November 1950https://doi.org/10.1021/ja01167a534RIGHTS & PERMISSIONSArticle Views71Altmetric-Citations3LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (284 KB) Get e-Alerts Get e-Alerts