49 results about "Ethyl hydroperoxide" patented technology

Conventionally, for anaerobically curable compositions that were used in assembly of a stacked steel sheet, fast curability was required for the efficiency of productivity. Recently, diversification of assembly methods has made not only curing acceleration by a primer but also curing acceleration by heating possible. In order for improvement in durability of stacked steel sheets, there has been a demand for improvement in shear adhesive strength and peeling adhesive strength of anaerobically curable compositions. The present invention relates to an anaerobically curable composition containing the following components (A) to (D): component (A): (meth)acryloyl compound, component (B): hydroperoxide, component (C): saccharin, and component (D): sodium salt, potassium salt or calcium salt of saccharin.

The invention relates to the technical field of anti-aging agents, and discloses a preparation method of an anti-aging agent and application of the anti-aging agent in plastics, the anti-aging agent contains styrene groups, and can be well fused and grafted with polyolefin such as polypropylene under the action of an initiator dibenzoyl peroxide or dicumyl peroxide, so that the anti-aging agent has a good anti-aging effect. The influence on the mechanical strength of the polyolefin plastic is very small, and the problem that physical blending can cause great influence on the mechanical strength and the use performance of the plastic can be avoided. Meanwhile, a phenol triazine structure contained in the anti-aging agent has a unique ultraviolet absorption effect, and a hindered amine structure is contained, so that the photo-oxygen degradation reaction of the polyolefin plastic can be inhibited through multiple ways of capturing free radicals and decomposing hydroperoxide, and through an accelerated aging experiment of xenon lamp irradiation, the plastic keeps very high tensile strength, and the anti-aging effect is good. And excellent thermo-oxidative aging resistance and ultraviolet radiation aging resistance are shown.

The present application provides thiamine compounds shown in formula (I) and application thereof. The thiamine compounds of the present application can be used for preparing polyolefin antioxidants. The thiamine compounds of the present application introduce sulfide bonds in aryl secondary amine, so that the antioxidant contains naphthylamine groups of primary antioxidants and sulfide groups of auxiliary antioxidants, which not only can terminate free radicals by providing hydrogen protons, but also can react with hydroperoxides, so as to achieve the dual effects of primary and auxiliary antioxidants, and thus the antioxidant effect is significantly enhanced.

The invention relates to fluorocarbon chain modified cobalt nickel-aluminum hydrotalcite and a preparation method and application thereof, ions in the cobalt nickel-aluminum hydrotalcite are Co < 2 + >, Ni < 2 + > and Al < 3 + > respectively, and a fluorocarbon chain is prepared from at least one compound in formulas (I)-(III); comprising the following steps: S1, stirring and mixing a Co < 2 + > aqueous solution, a Ni < 2 + > aqueous solution, an Al < 3 + > aqueous solution and a urea aqueous solution in an inert gas atmosphere, then carrying out a hydrothermal reaction, and after the reaction is finished, carrying out post-treatment to obtain cobalt nickel-aluminum hydrotalcite; and S2, dispersing the cobalt nickel-aluminum hydrotalcite in anhydrous toluene, reacting the cobalt nickel-aluminum hydrotalcite with at least one compound in formulas (I)-(III) under the action of triethylamine in an inert gas atmosphere, and after the reaction is finished, performing post-treatment to obtain fluorocarbon chain modified cobalt nickel-aluminum hydrotalcite, the hydrotalcite is applied to preparation of naphthenic alcohol and naphthenic ketone by catalyzing partial oxidation of naphthenic hydrocarbon. The method has the advantages of high selectivity, high product yield, low content of naphthenic hydroperoxide in the reaction process, and high operation safety.

A titanium-containing silicon oxide capable of producing an epoxide in a high yield when used as a catalyst in a reaction for producing an epoxide from an olefin and a hydroperoxide, in which the titanium-containing silicon oxide satisfies all conditions 1 to 5: Condition 1: an average pore diameter is 10 or more; condition 2: 80% or more of the total pore volume has a pore diameter of 5-200; condition 3: the total pore volume is 0.2 cm3 / g or more; condition 4: the D50 of the titanium-containing silicon oxide is from 1.00 mm to 3.30 mm. And Condition 5: the (D90-D10) / D50 of the titanium-containing silicon oxide is 0.35-1.00.

A method for producing oxidized forms of waxes (polar waxes) or polyketones containing oxygen functional groups from polypropylene (PP), polystyrene (PS), and / or polyethylene (PE), which can be used as lubricants, adhesives, coating agents, etc. In one or more examples, hydroperoxides were used as oxidants to cleave C-C and C-H bonds at mild temperatures (e.g., 150°C). C-C bond cleavage reduces the number average molecular weight (M n ) is reduced to 500-5000 g / mol. This method has been successfully applied to the conversion of post-consumer polyolefin waste to produce polar waxes or polyketones.

The present application provides a catalyst for hydrogen peroxide acidolysis, a preparation method and application thereof, which comprises a solid catalyst modified by a strong acid and a salt aqueous solution; wherein the solid catalyst is at least one selected from natural white clay, activated white clay, bentonite or diatomite, and the salt aqueous solution contains at least one inorganic salt selected from sodium salt, potassium salt, magnesium salt and calcium salt. When the catalyst of the present application is used for hydrogen peroxide acidolysis, it has high hydrogen peroxide conversion rate and product selectivity.

The present invention relates to processes for preparing propylene oxide, comprising reaction of propene with ethylbenzene hydroperoxide in the presence of a catalyst, as well as to catalysts employed in such processes and to methods for their manufacture. The catalysts of the invention are prepared in a process comprising sol-gel-synthesis of catalyst hydrogel-precursor, drying of catalyst hydrogel precursor, calcining of dried catalyst hydrogel-precursor, and optionally hydrophobizing the calcined catalyst hydrogel-precursor. The catalysts of the invention comprise amorphous titanium doped silica comprising pentahedrally coordinated titanium species.

The present disclosure relates to a process for the preparation of a tertiary alkyl organic peroxide comprising: a) reacting in a first condensation stage a component comprising at least one tertiary alcohol group with a compound comprising at least one tertiary hydroperoxide function in the presence of a catalyst and optionally a co-catalyst, b) separating the aqueous phase from the organic phase in a dehydration stage, and c) separating the aqueous phase from the organic phase in a second condensation stage in the presence of a catalyst and optionally a co-catalyst to form a mixture comprising an organic phase and an aqueous phase, the organic phase comprising a tertiary alkyl organic peroxide. The component containing at least one tertiary alcohol group is further reacted with the compound containing at least one tertiary hydroperoxide group, the molar ratio between the compound containing at least one tertiary hydroperoxide functional group and the component containing at least one tertiary alcohol group being at least 3: 1 in the first condensation stage, and the molar ratio between the compound containing at least one tertiary hydroperoxide functional group and the component containing at least one tertiary alcohol group being at least 2: 1 in the second condensation stage. And wherein dehydration does not occur during the first condensation stage.

The invention relates to the technical field of high polymer materials, and discloses an anti-aging PP board and a preparation method thereof.The anti-aging PP board is prepared from, by weight, 60-80 parts of PP, 15-30 parts of glass fiber, 8-12 parts of nano calcium carbonate, 0.5-1 part of silane coupling agent, 2-5 parts of compatilizer, 5-8 parts of inorganic flame-retardant material, 0.5-2 parts of lubricant and 1-5 parts of modified anti-aging agent. And 0.5-4 parts of a modified flame retardant. The preparation of the modified anti-aging agent can effectively inhibit the aging phenomena of cracking, impact strength reduction and the like of the plate after long-term use by capturing free radicals and decomposing hydroperoxide; according to the preparation of the modified flame retardant, the combustion process is inhibited by generating non-combustible gas and generating free radicals, the flame retardance of the system is improved, and the modified flame retardant has the advantages of environmental friendliness, good compatibility, lasting flame retardance and the like.

The invention provides a high-temperature low-attenuation polypropylene insulating material and a preparation method thereof, and belongs to the field of high-molecular polymers. The polypropylene composite material comprises polypropylene and concentrated master batch, the concentrated master batch contains polypropylene, an antioxidant, a nucleating agent and white mineral oil. The antioxidant comprises a semi-hindered phenol (capturing free radicals), sulfur (decomposing hydroperoxide) and copper damage prevention (inhibiting catalytic oxidation of copper ions) composite system, the three antioxidants form a synergistic effect, and the thermal oxidation resistance of the material can be remarkably improved. According to the invention, the high-temperature low-attenuation polypropylene insulation material with high temperature resistance grade, low attenuation at high temperature and good extrusion moldability is prepared through a composite antioxidant system, nucleating agent regulation and control and a step-by-step granulation process; the cable especially meets the requirements for new energy automobile cables at present.

The present invention relates to chemical and biological warfare agent decontaminating compositions and methods for using the same to decontaminate animal skin and wounds thereon exposed to the agents. The compositions may comprise a peracid, a hydroperoxide, and a peroxyacid.

The present invention discloses a low-temperature stable organic peroxide emulsion and a safe preparation method thereof. The emulsion comprises diisobutyryl peroxide, a hydroperoxide stabilizer, an organic solvent containing 2,2,4-trimethyl-1,3-pentanediol diisobutyrate, and an emulsifying / dispersing agent. By means of a method of coupling low-temperature high-shear dispersion with cyclic emulsification and combining real-time monitoring of combustible gas / oxygen / smoke, the problems of freezing of the emulsion under extremely cold conditions (-40°C) and the decomposition risk during the preparation process are solved. The obtained emulsion has significantly improved storage stability (≥85 days), low viscosity and excellent fluidity, and is suitable for industrial production.

The present invention relates to a process for the cold radical emulsion polymerization of a monomer mixture of 1,3-butadiene and a (meth)acrylate containing 1,3-butadiene and an alkyl methacrylate, in which process the polymerization reaction is initiated by a redox system comprising an organic hydroperoxide and an iron (II) salt in the presence of a mercaptan as transfer agent. The relative amounts of initiator, transfer agent and monomers result in a macrostructure characterized by a novel compromise between the number-average molar mass, Mn, and the dispersity, Đ. This compromise makes it possible to further improve the rolling resistance performance of a tire comprising a rubber composition comprising an elastomer prepared according to the process according to the invention.

Rate of rancid flavor development in oil-based sauces and dressings can be slowed down by addition of a mixture containing sequestering agents for dissolved oxygen and heavy metal ions that are derived from vinegar and fruit juices. The types and proportions of the components of the mixture are chosen to promote a balance of flavor and color neutrality and adequacy of sequestering both heavy metal ions and dissolved oxygen. The mixture is effective in retarding development of rancid flavor moieties of hydroperoxides and hexanal, similar to a commonly-used chemical sequestrant, ethylene diamine tetra acetate (EDTA).

The present invention relates to a method for purifying a mixture containing at least one alkyl hydroperoxide, preferably tert-butyl hydroperoxide or tert-amyl hydroperoxide, and at least one corresponding dialkyl hydroperoxide, said method comprising at least one step of extraction with water and at least one separation step which is carried out within the aqueous phase, obtained following the extraction step, in order to recover an aqueous solution which is rich in alkyl hydroperoxide. The invention also relates to an aqueous composition which is rich in alkyl hydroperoxide and contains at least 0.1% by weight of dialkyl peroxide in relation to the total weight of the composition.

The present invention relates to a method for the cold emulsion radical polymerisation of a monomer mixture of 1,3-butadiene and of a (meth)acrylate containing 1,3-butadiene and an alkyl methacrylate, in which the polymerisation reaction is initiated by a redox system comprising an organic hydroperoxide and an iron(II) salt, in the presence of a mercaptan as a transfer agent. The relative amounts of initiator, transfer agent and monomers result in a macrostructure characterised by a novel trade-off between the number-average molar mass, Mn, and the dispersity, Đ. This trade-off further enhances the rolling resistance performance of a tyre comprising a rubber composition that comprises an elastomer prepared according to the method of the invention.

The invention relates to the technical field of organic synthesis, in particular to a preparation method of dialkyl peroxide, which comprises the following steps: mixing an alcohol compound, alkyl hydroperoxide, an acid catalyst and an entrainer, and carrying out condensation reaction; wherein the entrainer is an acid capable of forming a highest azeotrope with water, and the addition amount of the entrainer is obtained according to the lowest water content which can be borne by a reaction system; water generated in the condensation reaction is evaporated out, and when the pH value of the evaporated-out product is smaller than a preset value, the reaction is stopped. According to the preparation method of the dialkyl peroxide, the reaction endpoint can be accurately judged, and the reaction safety is improved.

The invention relates to a preparation method of a bio-based 1, 5-pentamethylene diisocyanate product with yellowing resistance and high stability. A synergistic composite stable system composed of an efficient main antioxidant, an auxiliary antioxidant and a plurality of ultraviolet absorbents / light stabilizers in a scientific proportion is constructed. Wherein the main antioxidant is mainly used for capturing free radicals and blocking an oxidation chain reaction; the auxiliary antioxidant decomposes hydroperoxide to inhibit the hydroperoxide from further initiating the degradation of the material; the ultraviolet stabilizer effectively delays the color change process caused by illumination by absorbing or quenching excited state energy. The preparation method disclosed by the invention has the advantages of high process compatibility, easiness in acquisition of auxiliaries, simple compounding and post-treatment steps and convenience in large-scale popularization; the environmental protection property is outstanding, the yellowing resistance and the storage stability of the product are greatly improved, the normal-temperature closed storage period is prolonged to 6 months or above, the NCO content retention rate is greater than or equal to 96%, and the storage and transportation cost is reduced; the influence of thermal oxidation and photodegradation is resisted, and a complex application environment is adapted.

The invention relates to the technical field of rotational molding processing, and discloses an energy-saving rotational molding processing polyethylene blending composition and a preparation method thereof.The energy-saving rotational molding processing polyethylene blending composition is prepared from 100 parts of polyethylene, 0.02-0.1 part of a main antioxidant, 0.05-0.5 part of a methylene auxiliary and 0.06-1 part of an auxiliary antioxidant, and the auxiliary antioxidant is one or two of a phosphite antioxidant and a thioester antioxidant; the methylene auxiliary agent comprises one or more of allyl methylene and benzyl methylene; according to the composition, the methylene auxiliary agent and the auxiliary antibody are adopted, the methylene auxiliary agent can consume oxygen in a targeted mode to form hydroperoxide, the auxiliary antibody can rapidly decompose the hydroperoxide to form bound oxygen, after oxygen is consumed, the internal and external pressure difference of bubbles is increased, and the increased pressure difference can advantageously drive the bubbles to be discharged from high-viscosity polyethylene; bubble discharge is remarkably accelerated, insoluble impurities are not introduced, PIAT is remarkably reduced, and energy consumption of polyethylene rotational molding processing is remarkably reduced.

Dental adhesive set which contains an adhesive and an applicator which is coated with a vanadium(IV) salt.

The present application relates to a hydrogen peroxide-responsive Keap1-Nrf2 PPI inhibitor prodrug, and a preparation method therefor. The hydrogen peroxide-responsive Keap1-Nrf2 PPI inhibitor prodrug pro2 has a chemical structure as shown below. By modifying a key carboxyl pharmacophore in a Keap1-Nrf2 inhibitor with a H2O2-responsive thiazolidinone moiety, a novel ROS-responsive antioxidant prodrug pro2 is synthesized. The H2O2 activated prodrug pro2 can simultaneously achieve targeted activation of Nrf2 and enhancement of therapeutic efficacy in the body. The prodrug is based on the concept of ROS activation-ROS clearance therapy, is the first example of a H2O2-responsive prodrug suitable for oral administration, and is expected to be used clinically by virtue of the characteristics of druggability and high targeting ability.

The present invention relates to host cells comprising genes of the mevalonate, lycopene and α-ionone pathways and the hydroperoxide reductase or catalase genes. The present invention also relates to methods of producing apocarotenoids as well as kits for producing apocarotenoids comprising the host cells.

The present application relates to the field of antioxidant technology, and more specifically, to a high-temperature resistant antioxidant composition and its preparation method. A high-temperature resistant antioxidant composition includes 10-20 parts of an amine antioxidant, 5-10 parts of a phosphite antioxidant, and 8 parts of a zinc thiophosphate. The preparation method is as follows: after mixing the amine antioxidant, the phosphite antioxidant, and the zinc thiophosphate, stirring and mixing for 0.5-1h under a vacuum degree of (-0.4)-(-0.2) MPa, a high-temperature resistant antioxidant composition is obtained. The high-temperature resistant antioxidant composition of the present application can not only capture peroxyl radicals in hydraulic oil and terminate free radical chain reactions, but also decompose hydroperoxides and peroxides in hydraulic oil, thereby improving the antioxidant properties of hydraulic oil in high-temperature environments.

Crosslinked polymeric particles obtainable by copolymerization, in the presence of a chain transfer reagent, of at least one difunctional radically polymerizable monomer, optionally at least one monofunctional radically polymerizable monomer and at least one thiourea derivative according to the following Formula (I):in which R is an (n+1)-valent, aromatic, aliphatic, linear or branched C1-C50 hydrocarbon radical, which can be interrupted by one or more, preferably 1 to 8, particularly preferably 1 to 6, ether, thioether, ester, amide or urethane groups; PG is a radically polymerizable (meth)acrylate, (meth)acrylamide or vinyl group and n is 1 or 2. In combination with a hydroperoxide, the crosslinked polymeric particles are suitable as redox initiator system for the free-radical polymerization of compositions comprising at least one radically polymerizable monomer. These compositions are particularly suitable as dental materials.

The rate of rancidity development in oil-based sauces and dressings can be slowed by adding a mixture containing sequestering agents for dissolved oxygen and heavy metal ions, obtained from vinegar and fruit juices. The types and proportions of the mixture's components are chosen to promote a balanced flavor and neutral color, and to ensure adequate sequestration of both heavy metal ions and dissolved oxygen. The mixture is effective at delaying the development of rancidity from hydroperoxides and hexanal, similar to the commonly used chemical sequestering agent ethylenediaminetetraacetate (EDTA).

The present invention relates to a method for preparing 4-hydroxy-2-methylene-butanal, 4-hydroxy-2-methyl-but-2-enal and esters thereof of the formula (I.a) and (I.b) where R1 is as defined in the claims and the description, by subjecting isoprenol or an ester thereof to a photooxidation in the presence of a photosensitizer and an acylating agent. The invention relates moreover to certain hydroperoxides of the compounds (I.a) or (I.b), and to the use thereof as intermediates in the synthesis of compounds (I.a) and (I.b) or in the synthesis of retinol, stereoisomers and derivatives thereof.

The present invention relates to a composition comprising an aqueous dispersion of multistage polymer particles comprising a water-occluded core and a polymeric shell having a Tg in the range of from 60° C. and 120° C.; a preservative amount of either t-C4-C10-alkyl hydroperoxide or hydrogen peroxide; and less than 1000 ppm of residual monomer. The present invention addresses a need in the art by providing a way to preserve opaque polymers against microbial contamination without the use of a biocide.

The present invention provides a film comprising: a compound (A) containing at least one selected from the group consisting of maleimide compounds and citraconimide compounds; an organic peroxide (B) containing at least one selected from the group consisting of organic peroxides represented by a specific formula; and a hydroperoxide (C).

The invention relates to the technical field of preparation of high-performance adhesives, in particular to an epoxy resin composite antioxidant adhesive and a preparation method thereof. The invention discloses a modified epoxy resin which is composed of the following components in parts by mass: 40-60 parts of bisphenol A epoxy resin, 10-20 parts of novolac epoxy resin, 5-15 parts of a nano silicon dioxide modifier, 1-3 parts of a silane coupling agent KH-560, 8-12 parts of a dicyandiamide curing agent, 0.5-2 parts of a 2-ethyl-4-methylimidazole accelerant and 3-8 parts of a composite antioxidant system. According to the invention, through multi-dimensional formula design and process optimization, a composite anti-oxidation system is formed by compounding hindered phenol AO-60 and phosphite 168 according to a specific proportion, a main-auxiliary synergistic anti-oxidation mechanism is formed, free radicals can be effectively captured, hydroperoxide generated in the oxidation process can be decomposed, and the anti-oxidation effect is improved. In combination with the high-specific-surface-area physical adsorption effect of the silane coupling agent modified nano silicon dioxide, the oxidative degradation speed of the material in harsh environments such as high temperature and illumination is greatly delayed, and the service life is remarkably prolonged.