236 results about "Thioester" patented technology

The invention provides a flame-retardant polyolefin composition as well as a preparation method and application thereof, and the flame-retardant polyolefin composition comprises the following components in parts by weight: 13-22 parts of an ethylene-vinyl acetate copolymer, 1.5-8.5 parts of linear low density polyethylene, 8-17 parts of a polyolefin elastomer, 35-55 parts of a flame retardant and 0.5-2.5 parts of an antioxidant. The antioxidant comprises a main antioxidant and an auxiliary antioxidant; the main antioxidant comprises a hindered phenol antioxidant and an amine antioxidant; and the auxiliary antioxidant comprises a thioester antioxidant and / or a phosphite ester antioxidant. According to the flame-retardant polyolefin composition disclosed by the invention, the ethylene-vinyl acetate copolymer, the linear low-density polyethylene and the polyolefin elastomer are compounded according to a specific content, and meanwhile, the antioxidant with specific composition is matched, so that the flame-retardant polyolefin composition is good in heat resistance, aging resistance and precipitation resistance; meanwhile, the mechanical property is good.

The invention relates to the technical field of lubricating oil, and provides natural gas engine lubricating oil as well as a preparation method and application thereof. The natural gas engine lubricating oil comprises the following components in parts by weight: 1-5 parts of a clearing agent, 1-15 parts of a dispersing agent, 1-10 parts of an antioxidant, 0.1-1 part of a pour point depressant, 0.01-1 part of an anti-foaming agent and 60-95 parts of base oil, the antioxidant comprises ZDDP, an amine type antioxidant and an amino thioester antioxidant according to the weight ratio of 1: (3-8): (3-8). The natural gas engine lubricating oil provided by the invention not only has good high-temperature detergency, oxidation resistance, dispersity and wear resistance through the synergistic effect of different types of antioxidants, but also has excellent nitration resistance, and can completely meet the use requirements of the natural gas engine lubricating oil, and the sulfate ash content can be controlled to be 0.4-0.6%.

The invention discloses a mercury ion detection fluorescent probe based on quinoline as well as a preparation method and application of the mercury ion detection fluorescent probe. The fluorescent probe and a structural formula of the fluorescent probe are shown as a formula I in the specification. A quinoline derivative, namely 2-methyl-7-hydroxyquinoline, is used as a fluorescent chromophore, a thioester group is used as a recognition group, and the prepared fluorescent probe shows high sensitivity and high selectivity on Hg < 2 + > in a solution. The preparation method of the fluorescent probe is simple in steps, raw materials are easy to obtain, and the obtained product is a white flocculent solid, is easy to store, has a wide application prospect and can be produced and applied on a large scale.

The invention discloses a preparation method of a high-heat-resistance glass fiber reinforced polypropylene material. The preparation method comprises the following steps: uniformly mixing a hindered phenol antioxidant and a phosphine salt to obtain a heat-resistant auxiliary agent; the preparation method comprises the following steps: adding PP, chopped glass fibers, a heat-resistant auxiliary agent and thioester into a mixer, fully mixing, extruding by using a same screw extruder at the extrusion temperature of 210 + / -2 DEG C, and drying in a hot air environment of 100 + / -2 DEG C for 1-2 hours to obtain the high-heat-resistant glass fiber reinforced polypropylene material. The preparation method is simple, the raw materials are easy to obtain, the cost is low, the obtained high-heat-resistance glass fiber reinforced polypropylene material has the excellent performance of traditional PP-GF30, the heat resistance is remarkably improved, and the high-heat-resistance glass fiber reinforced polypropylene material can be suitable for high-temperature-resistant components including engine covers.

The invention belongs to the technical field of resin polymerization additives, and particularly relates to an antioxidant type suspended emulsion terminator for PVC (polyvinyl chloride) and a preparation method thereof, the antioxidant type suspended emulsion terminator comprises the following raw material components in parts by mass: 5-30 parts of phenolic antioxidant; 5 to 20 parts of a thioester antioxidant; 0.1-5 parts of an ultraviolet light absorber; 0.1 to 5 parts of a chain terminator; 1-10 parts of a heat stabilizer; 0.1 to 7 parts of a stabilizer; 0.1 to 5 parts of an emulsifier; 0.1-5 parts of a wetting dispersant; according to the invention, through the combination of the selected main and auxiliary antioxidants and the combination of the ultraviolet light absorber and the heat stabilizer, the defect structure of PVC is improved at the end of PVC polymerization, and meanwhile, the combination of the main and auxiliary antioxidants can quickly decompose peroxide and hydroperoxide at the later stage of processing; compared with the prior art, the whiteness and thermal stability of PVC in the early stage are good, the anti-yellowing effect and the long-term aging resistance of PVC in the later processing are more emphasized, the performance of PVC in the dynamic thermal stability is improved, and the volume impedance and the initial coloring are low.

The invention discloses an oxidation-resistant monomer casting nylon material and a preparation method thereof, and relates to the field of material preparation, and the monomer casting nylon material is applied to a high-temperature and oxygen-enriched environment and comprises the following components in parts by mass: 100 parts of caprolactam; 0.1-0.3 part of a catalyst which is one of sodium hydroxide, potassium hydroxide or lithium hydroxide; 0.5 to 1.5 parts of an activating agent, wherein the activating agent is N-acetyl caprolactam; 0.7 to 3 parts of a main antioxidant, wherein the main antioxidant comprises a hindered phenol antioxidant and a thioester antioxidant; 0.1-0.5 part of an auxiliary antioxidant, which is a metal deactivator; 1-3 parts of an inorganic filler which is modified montmorillonite; and 0.5-2 parts of a hydrophobic agent which is a silane coupling agent. By constructing a composite anti-oxidation system, multi-level synergistic protection can be formed for three key oxidation stages of free radical initiation, peroxide accumulation and metal catalysis, and a full path of an oxidation chain reaction is covered from a molecular level, so that the aging process of the material is remarkably delayed, and the service life of the material is prolonged. And high oxygen resistance and relatively long service life are provided for nylon application under severe working conditions.

The present disclosure provides extruded or spun, semi-permeable, porous hollow fibres, comprising covalent ester, thioester and / or amide crosslinked polypeptides as well as processes for their production. The hollow fibres may be produced from protein, protein extracts, and / or protein isolates derived from plants, animals, bacteria, algae, archaea, and / or fungi, and in certain embodiments are intended to be suitable for human and / or animal ingestion. In some embodiments, the hollow fibres may be designed to be used in the production of cartridges that are compatible with existing and / or novel bioreactor platforms, for harbouring cell cultures in cultured meat production.

The invention discloses polyamide with a main chain containing a thioester group and a synthesis method thereof, the structural general formula of the polyamide with the main chain containing the thioester group is shown in the following formula (I) or (II), in the formula, n is selected from 1-200; according to the polymer product disclosed by the invention, the polyamide of which the main chain contains the thioester group has a definite structure, a main chain repeating unit has thioester and amide structures and also contains different functional groups, and an end group has further reactivity; the polyamide containing the thioester group also has relatively high molecular mass and excellent mechanical properties; # imgabs0 #

Disclosed herein is a thioester-containing (meth)acrylate compound comprising at least two thioester moieties and at least 2 (meth)acrylate moieties and a method for making such compounds. These compounds can be used in (meth)acrylic resins as a crosslinking agent. Upon exposure to a nucleophilic solvent, cured (meth)acrylic resins derived from these thioester-containing (meth)acrylate compounds can be degraded.

The present invention is directed towards a coating composition comprising a film-forming polymer comprising active hydrogen-containing functional groups; a blocked polyisocyanate curing agent comprising a blocking group derived from a blocking agent comprising an alpha-hydroxy amide, ester or thioester; and a curing catalyst that does not contain tin, lead, iron, zinc or manganese. Also disclosed are coatings, coated substrates, and methods of coating a substrate.

A stabilized polymer composition comprising an organic polymeric material to be stabilized and a stabilizer composition comprising: at least one inorganic UV blocker, at least on hindered amine light stabilizer compounds, at least on hindered phenol antioxidant compound, at least one phosphite or phosphonite compound, and at least one thioester, wherein the stabilizer composition provides effective ultraviolet (UV) light stability, thermal stability and gas fade resistance to the stabilized polymer even when a hindered hydroxybenzoate, an organic UV absorber, an acid scavenger and / or a dialkylhydroxylamine are not present.

The present invention relates to improved cellulose nanocrystal fillers for rubber compositions, and more particularly to the grafting of disulfides and thioesters onto cellulose nanocrystals to improve performance as fillers in rubber compositions. At least one embodiment describes a method of grafting a thiol or disulfide on a CNC surface by, for example, esterification of 3-mercapto-propionic acid (MPA), 3-(acetylthio) propionic acid (APA), or dithiodipropionic acid (DTDPA). The reaction can be carried out on CNC that is highly dispersed in a suitable solvent and the reaction conditions are improved to achieve an advantageous degree of substitution DS. Embodiments further disclose how the surface thiol groups may then be protected in a second step as thio esters or asymmetric disulfides to modulate the hydrophobicity of CNC to improve compatibility with styrene-butadiene, SBR or natural rubber.

The invention relates to a cable sheath material, and particularly discloses a weather-proof low-smoke halogen-free flame-retardant polyolefin cable sheath material and a preparation method thereof. The cable sheath material is prepared from 30 to 45 parts of low-density polyethylene, 10 to 30 parts of high-impact homo-polypropylene, 15 to 30 parts of graft modified flexibilizer, 30 to 50 parts of main flame retardant, 1 to 5 parts of coupling agent, 10 to 30 parts of phosphorus-nitrogen synergistic flame retardant, 4 to 10 parts of efficient smoke suppressant, 0.2 to 0.8 part of hindered phenol main antioxidant, 0.4 to 1.2 parts of thioester auxiliary antioxidant, 0.4 to 1.0 part of hindered amine light stabilizer, 0.5 to 1.5 parts of ultraviolet light absorber and 2.5 to 2.5 parts of weather resistance enhancer. 5.0 parts of a lubricant, 0.5 to 2.0 parts of a lubricant, and 0.1 to 0.8 part of an anti-copper agent. The mechanical property, the electrical insulation property and the weather resistance of the sheath material are effectively improved, an efficient synergistic flame retardant effect can be obtained, the flame retardant property is excellent, and a finished product can obtain excellent weather resistance, low-smoke zero-halogen property, flame retardant property, mechanical property, electrical insulation property and the like.

Polymer compositions containing an ethylene polymer, 50-1500 ppm by weight of a glycerol stearate, and 250-7500 ppm by weight of an antioxidant selected from a phenolic antioxidant, a phosphite antioxidant, a thioester antioxidant, or any combination thereof, are described. These polymer compositions have improved initial color, improved color after long-term aging, or improved color after multi-pass extrusion processing.

The present disclosure provides extruded or spun, semi-permeable, porous hollow fibres, comprising covalent ester, thioester and / or amide crosslinked polypeptides as well as processes for their production. The hollow fibres may be produced from protein, protein extracts, and / or protein isolates derived from plants, animals, bacteria, algae, archaea, and / or fungi, and in certain embodiments are intended to be suitable for human and / or animal ingestion. In some embodiments, the hollow fibres may be designed to be used in the production of cartridges that are compatible with existing and / or novel bioreactor platforms, for harbouring cell cultures in cultured meat production.

The invention provides an extracting agent and a method for separating high-economic-value metal in waste water by using the extracting agent, and belongs to the technical field of waste water purification, the extracting agent takes binary heterocycle as a molecular skeleton, the binary heterocycle is large in space volume, it can be guaranteed that the molecular structure of the extracting agent presents a specific space structure, and selective extraction of target metal is guaranteed; through chemical derivatization of binary heterocycle, the length of a molecular chain segment is directionally regulated and controlled, the chemical activity of a functionalized functional group can be changed, and the dimension of spatial extension of a molecular main chain of the extraction agent is regulated and controlled; according to the invention, through esterification reaction with aliphatic cyclic mercaptan, thioester groups are formed, so that the introduction of activation sites of the extraction agent is realized, the purpose of selective chelation / complexation with target metal ions is achieved, the interference of other impurity metal ions in a wastewater solution system is avoided, and meanwhile, the extraction agent can be suitable for solution systems of various complex anion types.

The invention provides an anti-yellowing cross-linked polyethylene insulation material, a preparation method and application thereof and a cable. The anti-yellowing cross-linked polyethylene insulation material comprises polyethylene, a main antioxidant, a carbon free radical capturing agent, a cross-linking agent, a lubricant and an optional auxiliary antioxidant. The main antioxidant comprises one or more of hindered phenol antioxidants; the auxiliary antioxidant comprises one or more of a thioester antioxidant and a phosphite ester antioxidant; the carbon free radical capturing agent comprises one or more of hindered amines, hydroxylamines, bisphenol monoacrylates, benzofuranones and ortho-allylic substituted phenols; the carbon free radical capturing agent comprises one or more of the hindered amines, hydroxylamines, bisphenol monoacrylates, benzofuranones and ortho-allylic substituted phenols; the mass ratio of the main antioxidant to the auxiliary antioxidant to the carbon free radical capturing agent is (0.1-1.5): (0-1): (0.1-0.5). The main antioxidant or an antioxidant system composed of the main antioxidant and the auxiliary antioxidant can inhibit thermal oxidative degradation of polyethylene in the processing process; under the action of the carbon free radical capturing agent, the generation of chromogenic substances can be reduced.

The invention relates to the field of epoxy molding compounds, and discloses an epoxy molding compound and a preparation method and application thereof, the epoxy molding compound contains epoxy resin, phenolic resin, a curing accelerator, an inorganic filler, a release agent, a coupling agent, an ion capturing agent, a low stress modifier, a coloring agent and a release agent stabilizer; the release agent stabilizer comprises a main release agent stabilizer and an auxiliary release agent stabilizer, wherein the main release agent stabilizer is selected from one or more than two of a tertiary amine compound, a diaryl secondary amine compound and a p-phenylenediamine compound; and the auxiliary release agent stabilizer is selected from one or more than two of a thiol compound, a thioester compound, a dithio organic phosphate compound and a phosphite compound. The epoxy molding compound provided by the invention can realize continuous packaging, has excellent continuous packaging formability, reduces the number of packaged defective products in the continuous packaging process, improves the continuous packaging efficiency, and has huge industrial application prospects.

This invention discloses a high-transmittance insulating ink for back-contact batteries and its preparation method, belonging to the technical field of insulating inks. The insulating ink comprises the following components by mass percentage: 60%~64% base resin, 1%~2% thiol, 2%~4% tackifier, and 25%~30% diluent; wherein the base resin is a hydroxyl-terminated polyester-modified acrylate, the thiol is ethylene dithiol, the tackifier is at least one of terpene resin, C5 petroleum resin, and C9 petroleum resin, and the diluent is at least one of 1,4-butanediol diacrylate, pentaerythritol triacrylate, and dipropylene glycol diacrylate. This invention utilizes the reaction of the dithiol's dithiol group with the hydroxyl groups (-OH) or double bonds in the hydroxyl-terminated polyester-modified acrylate to form thioether bonds (-S-) or thioester bonds, constructing a three-dimensional cross-linked network, thereby significantly improving the hardness and transmittance of the cured resin system. The reasonable combination of tackifier and diluent allows the ink to achieve high adhesion while maintaining hardness.

Disclosed in the present invention are pyruvic acid (hetero)aryl thioester compounds for LED photopolymerization, a preparation method therefor and the use thereof. The pyruvic acid (hetero)aryl thioester compounds disclosed by the invention can be used as LED photopolymerization initiators, have good absorption performance in a visible light region of 400 nm or above, and all particularly show good initiation property under LED light sources of 405 nm and 455 nm. Therefore, said compounds can effectively initiate photopolymerization reactions of photopolymerizable monomers, especially (meth)acrylate monomers. Additionally, the pyruvic acid (hetero)aryl thioester compounds have excellent biocompatibility and involve simple synthesis routes, thereby having extremely high practical value.

The invention belongs to the technical field of coupling reagents, and particularly discloses application of N-sulfonyl imidazolium salt as a coupling reagent, and the N-sulfonyl imidazolium salt as the coupling reagent is applied to synthesis of amide, dipeptide, polypeptide, carboxylic ester, carboxylic thioester, phosphamide and phosphate. According to the application of the N-sulfonyl imidazolium salt as the coupling reagent, compared with the prior art, the dosage of the coupling reagent is greatly reduced, the generation of byproducts is reduced, and the conversion rate of reactants is improved.

The invention provides an olefin hydrocarbonylation method which comprises the following step: olefin as shown in a formula (1), a nucleophilic reagent as shown in a formula (2) and carbon monoxide are subjected to a hydrocarbonylation reaction under the action of a metal catalyst, a ligand, protonic acid and optional iodide under the condition of illumination. According to the present invention, olefin represented by a formula (1), a nucleophilic reagent represented by a formula (2) and carbon monoxide are adopted as raw materials, and under the action of a metal catalyst, a ligand, a protonic acid and an optional iodide, a hydrocarbonylation reaction is performed under the illumination condition so as to obtain carboxylic acid / ester / amide / thioester and other products; the method provided by the invention can be realized at normal temperature and normal pressure, does not need special equipment, has low potential safety hazard and low energy consumption, greatly reduces the cost of large-scale production of carboxylic acid / ester / amide / thioester, and provides a novel green and efficient synthesis process for industrial production of carboxylic acid / ester / amide / thioester.

Provided is a phosphonium compound represented by Formula (I):in Formula (I), R1, R2, and R3 are independently from each other, an alkyl group or an aryl group, the alkyl group is a substituted or unsubstituted, linear or branched alkyl group having 1 to 20 carbon atoms or a substituted or unsubstituted cyclic alkyl group having 5 to 20 carbon atoms, the aryl group is a substituted or unsubstituted aryl group having 6 to 20 carbon atoms; X is a reactive group having a hydrazide group, a halide group, a pseudohalide group, or a thioester group; and Y− is an anion having a total charge of −1, or Y− is absence.

Provided is a method for producing a carbonyl compound using light energy, the method being characterized by irradiating a substrate with light having a wavelength of 200-420 nm in the presence of a tetrahalomethane to react the substrate. The method, which is for producing a carbonyl compound, e.g., an ester, a lactone, a carboxylic acid, an amide, a thioester, or a ketone, makes it possible to obtain the carbonyl compound directly from a substrate without using a heavy metal or the like in a stoichiometric amount.

The present invention discloses a one-step method for preparing fluoromethyl thioester compounds from aromatic olefins. Under heating conditions, the aromatic olefin compounds are used as starting materials, fluoromethyl thiobenzenesulfonate is used as a fluoromethylthiolation reagent, and an oxidant, a catalyst, and an organic solvent are added for reaction to obtain the fluoromethyl thioester compounds. The method of the present invention uses inexpensive and readily available aromatic olefin compounds as starting materials, fluoromethyl thiobenzenesulfonate is used as a fluoromethylthiolation reagent that is stable at room temperature, a mild peroxide compound as an oxidant, a copper salt as a catalyst, and acetonitrile as a solvent. The corresponding fluoromethyl thioester compounds are obtained by heating the reaction in air for a certain period of time. This synthetic method features mild conditions, simple operation, environmental friendliness, a wide range of substrate applicability, and good functional group tolerance. Most importantly, it represents the first development of a new pathway for the direct synthesis of fluoromethyl thioesters from aromatic olefins.

The invention discloses a stabilizer for a transparent PVC (Polyvinyl Chloride) product with good gamma-ray irradiation resistance. Comprising the following components in parts by weight: 10-20 parts of benzoic acid organic calcium salt, 10-20 parts of benzoic acid organic zinc salt, 10-20 parts of benzoic acid organic magnesium salt, 10-20 parts of benzoic acid organic aluminum salt, 20-30 parts of hydrotalcite, 5-10 parts of borate, 3-10 parts of a pyrimidine auxiliary color retention agent, 3-10 parts of a hindered amine light stabilizer and 5-10 parts of a thioester antioxidant. The hindered amine light stabilizer is a light stabilizer with a hindered amine methyl piperidine structure. The transparent PVC product added with the stabilizer has excellent gamma-ray irradiation resistance, and after the irradiation dose is 25kGy, the yellowness index YI of the transparent PVC product is less than 5.0, which indicates that the transparent PVC product added with the stabilizer does not change color in later application and storage processes after gamma-ray irradiation; the transparency is kept well, the light transmittance after irradiation is greater than 85%, and the transparency requirements of medical and food packaging are met; the mechanical property is well maintained, and the tensile strength retention rate after irradiation is greater than 90%.

The present disclosure provides extruded or spun semi-permeable porous hollow fibers comprising covalent ester, thioester, and / or amide cross-linked polypeptides and methods of producing the same. The hollow fibers may be produced from proteins, protein extracts and / or protein isolates derived from plants, animals, bacteria, algae, archaea and / or fungi and, in certain embodiments, are intended to be suitable for human and / or animal ingestion. In some embodiments, the hollow fibers may be designed for producing cartridges compatible with existing and / or novel bioreactor platforms for containing cell cultures in cultured meat production.

The invention concerns a novel fluorophore compound represented by any of the following General Formula P1, or General Formula P2, or General Formula P3 wherein R1 denotes a saturated or unsaturated alkyl group having from 2 to 10 carbon atoms, or a saturated or unsaturated alkyl group having from 2 to 10 carbon atoms conjugated to a molecule R4 with an ester bond, a thioester bond, or an amide bond, wherein R4 denotes biotin or another organic molecule having a molecular 10 weight of no more than 1'000 Daltons, and wherein A– denotes an anion selected from the group consisting of F-, Cl-, Br-, I-, tetrafluoroborate (BF4 -), hexafluorophosphate (PF6 -), triflate (Tfl-), tosylate (Tos-), acetate, SO4 2-, OH-, and NO3 -.The invention also concerns methods for producing said compounds and a staining composition comprising said compound.

Molecular probe compounds according to the formula P-L-I are described. P is a targeting peptide selected from the group consisting of SEQ ID NO: 1 to SEQ ID NO: 117; I is an imaging agent; and L is an optional non-peptide linker that covalently links the peptide to the imaging agent, wherein the linker comprises a carboxylic acid that forms a carboxamide with an amine of the targeting peptide or a maleimide that forms a thioester bond with a cysteine residue of the targeting peptide. Methods of detecting cancer and monitoring the treatment of cancer using the molecular probes are also described.

The present application relates to a composite stabilizer of 2-bromo-3,3,3-trifluoropropene and its use method, the composite stabilizer comprises: a phenolic compound, a phosphite or thioester compound, an acid binding agent, the molar ratio of the amount of the three substances is 1:0.1~6:0.1~6, and the mass ratio of the amount and 2-bromo-3,3,3-trifluoropropene is 0.001~1.0:100. Through the interaction between the above stabilizer components, the rectification process of the product can effectively inhibit the deterioration problems such as the increase of acid value, the color change to yellow and the decrease of purity of 2-bromo-3,3,3-trifluoropropene, provide excellent long-term stability, facilitate its production, transportation and storage, and ensure its smooth application in the field of new fire extinguishing agent, organic synthesis and the like.