7 results about "N-Octanoic acid" patented technology

The invention relates to the technical field of gas leak detection agents, and provides a micron bubble leak detection agent and a preparation method and application thereof. The micron bubble leak detection agent is composed of a component A and a component B, wherein the component A comprises the following components in parts by weight: 40-50 parts of deionized water, 2-4 parts of n-caprylic acid, 1-1.5 parts of a foaming agent, 0.1-0.2 part of a corrosion inhibitor, 0.05-0.08 part of sodium polyacrylate and 0.02-0.04 part of a chelating agent; the component B is prepared from the following components in parts by weight: 40 to 50 parts of deionized water, 0.05 to 0.1 part of sodium carboxymethyl cellulose, 0.05 to 0.1 part of xanthan gum, 0.4 to 0.8 part of polyhydric alcohol, 0.2 to 0.4 part of octanol and 0.3 to 0.5 part of an auxiliary agent; the auxiliary agent comprises anionic polyacrylamide and hydrolyzed polyacrylonitrile sodium salt in a mass ratio of 2: (1-2). According to the technical scheme, the problem of insufficient foam stability of the gas leak detection agent in the prior art is solved.

This invention relates to an additive manufacturing method for strain rate-enhanced composite gels, comprising: a) polymerizing silicone oil, boric acid, and octanoic acid at high temperature to prepare a shear-hardening gel; b) introducing the shear-hardening gel into a polyvinyl alcohol aqueous solution and adding chitosan particles, followed by ball milling to obtain a composite gel precursor; c) printing the composite gel precursor using pneumatic extrusion combined with a triaxial motion control system, and then obtaining the composite gel through freeze-thaw treatment. This composite gel precursor is propelled from the nozzle by air pressure in a pneumatic extruder, and the triaxial motion control system enables the deposition of arbitrary two-dimensional patterns and the stacking of three-dimensional structures, overcoming the limitations of traditional strain rate-enhanced composite gels formed by molding and injection molding methods, and endowing it with greater molding freedom and higher molding precision in additive manufacturing.

This invention relates to the field of gas leak detection agents, and proposes a micron-sized bubble leak detection agent, its preparation method, and its application. The micron-sized bubble leak detection agent consists of component A and component B. Component A includes the following components by weight: 40-50 parts deionized water, 2-4 parts n-octanoic acid, 1-1.5 parts foaming agent, 0.1-0.2 parts corrosion inhibitor, 0.05-0.08 parts sodium polyacrylate, and 0.02-0.04 parts chelating agent. Component B includes the following components by weight: 40-50 parts deionized water, 0.05-0.1 parts sodium carboxymethyl cellulose, 0.05-0.1 parts xanthan gum, 0.4-0.8 parts polyol, 0.2-0.4 parts octanol, and 0.3-0.5 parts additives. The additives include anionic polyacrylamide and hydrolyzed sodium polyacrylonitrile in a mass ratio of 2:1-2. This technical solution solves the problem of insufficient foam stability in gas leak detection agents in related technologies.

The invention discloses an interactive response layered superlattice nanoprobe as well as a synthesis method and application thereof, and belongs to the technical field of nanomaterials and biosensing. The nanoprobe is synthesized through a ligand regulation and control self-assembly strategy, specifically, a platinum source, n-caprylic acid and molybdenum hexacarbonyl are mixed and heated for a reaction, and after the reaction is finished, aftertreatment is conducted to obtain the interactive response layered superlattice nanoprobe. The nanoprobe has a highly-ordered layered superlattice structure, and can generate synergistic change of structure and catalytic activity under different H2O2 concentrations, so that specific interactive response to H2O2 is realized. The nanoprobe is controllable in synthesis process and stable in structure, the interactive response performance of the nanoprobe provides core material support for threshold type detection of biomarkers, the technical problems that a traditional nanomaterial is single in response to substrate concentration change and insufficient in sensitivity are solved, and the nanoprobe has important application value in the fields of biosensing, clinical detection and the like.

The invention relates to a refrigerating machine oil composition, a preparation method and an application of the refrigerating machine oil composition in cryosleep refrigeration equipment. The refrigerating machine oil composition comprises base oil, an anti-wear agent, an antioxidant, a metal deactivator and an acid capturing agent. The fluorine-containing cyclobutyl synthetic ester disclosed by the invention is generated by esterification of n-caprylic acid (long-chain carboxylic acid) and (3, 3-difluorocyclobutyl) methanol (fluorine-containing cyclobutyl alcohol), so that a four-membered ring rigid framework of (3, 3-difluorocyclobutyl) in a molecular structure of the fluorine-containing cyclobutyl synthetic ester can destroy regular stacking of molecular chains; moreover, due to the strong electron withdrawing effect of two fluorine atoms connected with cyclobutyl, the intermolecular Van der Waals' force is weakened, and due to the flexible adjustment of n-caprylic acid linear alkyl, the pour point of the refrigerating machine oil composition is as low as-50 DEG C or below, so that the refrigerating machine oil composition still has excellent flowability at an ultralow temperature, and the refrigerating machine oil composition can be widely applied to refrigerating machines. Therefore, the lubricating oil has the advantages of excellent viscosity-temperature performance, excellent lubricating performance and low pour point.

The invention discloses a solid superacid catalyst as well as a preparation method and application thereof, and belongs to the technical field of catalyst preparation. The catalyst comprises a mesoporous carrier, sulfate radicals combined on the mesoporous carrier and rare earth ions doped on the mesoporous carrier, wherein the mesoporous carrier is formed by compounding ZrO2 and Al2O3; the rare earth ions are Yb < 3 + > and Ce < 3 + >. The solid superacid catalyst provided by the invention has the advantages that the active components are uniformly dispersed, the catalytic activity is high, the conversion rate of ethyl n-caprylate in a capryloyl hydroximic acid preparation process can be improved, and meanwhile, the cycle service life of the catalyst is prolonged.

The invention belongs to the technical field of refrigerating machine oil, and particularly relates to refrigerating machine oil for an HFOs refrigerant, a working fluid composition and application. The polyol ester is prepared from the following raw materials: polyol, first carboxylic acid and second carboxylic acid; the polyol comprises at least one of dipentaerythritol, pentaerythritol and trimethylolpropane, the first carboxylic acid comprises caprylic capric acid, and the second carboxylic acid comprises at least one of isononanoic acid, isocaprylic acid and adipic acid. After isocaprylic acid in the synthetic ester raw material is replaced by caprylic-capric acid, the strength of an oil film formed after the caprylic-capric acid is mixed with a refrigerant is greatly enhanced, and the lubricating effect is remarkably improved; the subsequent research finds that compared with independent n-caprylic acid or n-capric acid serving as a raw material of dipentaerythritol ester, pentaerythritol ester and trihydroxy propane ester, the strength of a corresponding synthetic ester oil film is higher, the lubricating effect is better when the caprylic capric acid serves as refrigerating machine oil, and the minimum four-ball wear scar diameter can reach 0.653 mm.