摘要:
The present invention relates to a metal compound of calixarene not containing sulfur and dispersible in oil, which can be partially salified, or neutral, or basic or overbased, said calixarene having general formula (I) in which: a) R1, R2, R3 and R4 are independently selected from hydrogen, or a group containing carbon and hydrogen, or a group containing in addition to carbon and hydrogen also heteroatoms, provided that said heteroatoms are not sulfur; b) one of the two substituents R5 and R6 is hydrogen, while the other may be selected from hydrogen, or a linear or branched alkyl with a number of carbon atoms between 1 and 6, preferably methyl, ethyl, 1-propyl, 2-propyl, n-butyl, sec-butyl, more preferably methyl or ethyl; c) n is the number of units of the calixarene ring and is comprised in the range between 4 and 16, preferably between 5 and 12; said calixarene being characterized in that in at least one of the n units of the calixarene ring, at least one of the substituents R1, R2, R3 and R4 contains at least one acid group of carboxylic type available for the reaction with a metal base, with the proviso that said acid group of carboxylic type is not contained in a unit of the calixarene ring derived from salicylic acid.
摘要:
A process for preparing graphene oxide includes the steps of subjecting an aqueous dispersion of a graphite to an exfoliation step by high shear mixing at a mixing speed equal to or greater than 3000 rpm and to an oxidation step with an oxidizing agent selected from hydrogen peroxide, potassium hydroxide and mixtures thereof, wherein the graphite exfoliation step can precede, follow or be conducted together with the oxidation step. Also related is the use of the graphene oxide thus obtained to impart antimicrobial properties to rubber articles.
摘要:
Hydrogenated polymers with a radial structure having a core made up of calixarenes of the general formula (I), to the core of which is linked a number P of hydrogenated linear polymer segments selected from: —hydrogenated homopolymers or copolymers of conjugated dienes; or —hydrogenated copolymers of said conjugated dienes and monoalkenyl arenes, and —mixtures thereof said formula (I) in which: —R1, R2, R3 and R4 are independently selected from hydrogen; a group containing carbon and hydrogen; a group also containing heteroatoms in addition to carbon and hydrogen; a group also containing silicon in addition to carbon, hydrogen and heteroatoms; —one of the two substituents R5 and R6 is hydrogen, while the other may be hydrogen or alkyl, with a number of carbon atoms between 1 and 6, preferably methyl and ethyl; —n is an integer in the range between 4 and 16.
摘要:
A friction reducing additive is described formed by a mixture that is obtainable by autocatalytic condensation reaction of fatty acids with alkanolamines. The mixture includes an amide, one or more esters of carboxylic acids, and an oxazoline in an amount greater than 7% by weight with respect to the total weight of the mixture, wherein the additive may be used both in lubricants and in fuels.
摘要:
A method for the assessment of the dispersing capacity of new and used lubricating compositions, in particular for internal combustion engines, and of additives for lubricating compositions, comprises the steps of: providing a homogeneous dispersion of at least one carbonaceous particulate in a composition to be tested, consisting of a lubricating composition or a fraction or component thereof; acquiring at least one micrographic image of a sample of said homogeneous dispersion, deposited on an observation support; calculating the lacunarity of the acquired image as a parameter representative of the degree of dispersion of the particulate in the composition.
摘要:
A process for preparing an antimicrobial coating composition includes the following steps:
a. providing an aqueous dispersion having graphite, at least one oxidizing agent and optionally at least one antimicrobial agent; b. subjecting the aqueous dispersion from step a to high shear homogenization mixing the dispersion at a mixing speed equal to or greater than 1000 rpm, to obtain an antibacterial aqueous dispersion having graphene oxide; and c. mixing the aqueous antimicrobial dispersion with at least one film-forming agent to obtain the antimicrobial coating composition.
The composition obtainable by the above process and use thereof to impart antimicrobial properties to the surface of a substrate are also related.
摘要:
A lipophilic copolymer including polar multi-blocks having general formula (I): [(ByAk)s]t(AjCm) (I) wherein: B represents at least one monomer unit deriving from a lipophilic monomer having general formula (II): wherein: X represents a hydrogen atom; or a methyl group; R is selected from C1-C50 alkyl groups, linear or branched; A represents at least one monomer unit deriving from a polar monomer selected from: (a) compounds having general formula (III): wherein X represents a hydrogen atom or a methyl group and n represents an integer comprised between 0 and 4; (b) (meth)acrylamide or (meth)acrylamides substituted on the nitrogen atom with one or two C1-C4 alkyl groups linear or branched; (c) di-(C1-C4)-alkylamino-(C1-C4)-alkyl (meth)acrylates; C represents at least one monomer unit deriving from a polar polyfunctional monomer having general formula (IV): Z—(W)p (IV) wherein: Z represents a group containing carbon, hydrogen and, optionally, oxygen; and W represents a function able to react covalently with an alkyl radical.
摘要:
Hydrogenated polymers with a radial structure having a core made up of calixarenes of the general formula (I), to the core of which is linked a number P of hydrogenated linear polymer segments selected from: —hydrogenated homopolymers or co-polymers of conjugated dienes; or —hydrogenated co-polymers of said conjugated dienes and monoalkenyl arenes, and —mixtures thereof said formula (I) in which: —R1, R2, R3 and R4 are independently selected from hydrogen; a group containing carbon and hydrogen; a group also containing heteroatoms in addition to carbon and hydrogen; a group also containing silicon in addition to carbon, hydrogen and heteroatoms; —one of the two substituents R5 and R6 is hydrogen, while the other may be hydrogen or alkyl, with a number of carbon atoms between 1 and 6, preferably methyl and ethyl; —n is an integer in the range between 4 and 16.