748 results about "Thioglycolic acid" patented technology

The invention discloses a phosphoric-acid-base modified polycarboxylic-acid water reducer with high adaptability and a preparation method thereof. The water reducer is prepared from the following raw materials: isopentenol polyoxyethylene ether, hydrogen peroxide, acrylic acid, an unsaturated phosphoric acid monomer, deionized water, a reducing agent, and a chain transferring agent. The chain transferring agent is one of mercaptoethanol, mercaptoacetic acid and mercaptopropionic acid. The unsaturated phosphoric acid monomer is prepared from 2-phosphono-1,2,4-butanetricarboxylic acid, p-toluenesulfonic acid and hydroquinone. The preparation method for the water reducer comprises adding isopentenol polyoxyethylene ether and deionized water into a reaction vessel, uniformly stirring, heating, keeping warm, adding oxygen peroxide, then dropwise adding a material solution by employing a constant-flow pump, continuing to keep warm for reacting for 1-1.5 h after dropwise adding of the material solution is finished, naturally cooling to room temperature, and adjusting the pH value of the obtained product to 5-6 by using an alkaline solution. The phosphoric-acid-base modified polycarboxylic-acid water reducer possesses good sulfate ion resisting capability and sludge resisting capability, thereby satisfying engineering demand.

The invention relates to calcium carbonate filler, and specifically relates to wear-resistant surface modified calcium carbonate filler. The modified calcium carbonate filler is prepared from the following raw materials in parts by weight: 200 parts of calcium carbonate powder, 1-2 parts of iron-ore slag powder, 4-5 parts of polytetrafluoroethylene, 1-2 parts of graphene, 1-2 parts of hexadecyl trimethyl ammonium bromide, 1-2 parts of polyacrylamide, 1-2 parts of titanium dioxide, 2-3 parts of dimethyl disulfydryl stannum isooctyl acetate, 2-3 parts of sodium lignin sulfonate, 2-3 parts of hydroxyl silicone oil and 4-5 parts of an assistant. According to the modified calcium carbonate powder provided by the invention, calcium carbonate is modified by adopting various surfactants such as hexadecyl trimethyl ammonium bromide, polyacrylamide, sodium lignin sulfonate and hydroxyl silicone oil. The performance indexes of the modified calcium carbonate powder such as oil factor, viscosity and activating rate are improved, and the modified calcium carbonate powder is easier to disperse and compatibilize in a macromolecular polymer. When the modified calcium carbonate powder is used to fill a PVC (Polyvinyl Chloride) material, the reinforcing effect of the modified calcium carbonate is more excellent than unmodified calcium carbonate.

The invention relates to a dual-emission ratio-type quantum dot fluorescence probe for visual detection of aspirin, a preparation method and an application thereof and belongs to the technical field of preparation of material and detection of content of medicines. The preparation method of the probe includes following steps: preparing a precursor NaHTe solution from sodium borohydride, tellurium powder and water under an ultrasonic environment; adding the precursor to an aqueous solution of CdCl2.2.5H2O in the presence of thioglycollic acid; carrying out a reflux reaction with a nitrogen protecting condition to obtain required green fluorescence quantum dot and red fluorescence quantum dot; by means of a sol-gel method, wrapping the red fluorescence quantum dot with silicon spheres with amino group being connected; dispersing a green fluorescence quantum dot solution and the red fluorescence quantum dot wrapped with the silicon spheres in an MES buffer solution with addition of an EDC/NHS solution; and carrying out a reaction at room temperature in a dark place to obtain the dual-emission ratio-type quantum dot fluorescence probe. The dual-emission ratio-type quantum dot fluorescence probe is used in detection of the content of the aspirin through fluorescence quantitation and visualized analysis. The quantum dot fluorescence probe is quite good in optical performance and stability and has a capability of visualizedly detecting the aspirin.

A method for removing calcium, iron, other metals, and amines from crude oil in a refinery desalting process includes the steps of adding a wash water to the crude oil; adding the wash water to the crude oil to create an emulsion; adding to the wash water, the crude oil or the emulsion an acid additive consisting of at least one of the following: oxalic acid, citric acid, water-soluble hydroxyacid selected from the group consisting of glycolic acid, gluconic acid, C.sub.2-C.sub.4 alpha-hydroxy acids, malic acid, lactic acid, poly-hydroxy carboxylic acids, thioglycolic acid, chloroacetic acid, polymeric forms of the above hydroxyacids, poly-glycolic esters, glycolate ethers, and ammonium salt and alkali metal salts of these hydroxyacids, and mixtures thereof; heating at least one of the crude oil, the wash water or the emulsion to a desired temperature; resolving the emulsion containing the acid additive into a hydrocarbon phase and an aqueous phase using electrostatic coalescence, the metals and amines being transferred to the aqueous phase; measuring at least one desalting process characteristic at at least one process point; performing a statistical calculation of the desalting process performance based upon the measuring; and adjusting a control setting of the desalting process as a function of the statistical calculation. Other methods and devices are also provided.

The invention belongs to the technical field of the preparation method of a nano material, in particular to a preparation method of a ZnSe-to-Cu quantum point. The preparation method comprises the following steps that: (1), under the protection of inert gases, Se powder and sodium borohydride are dissolved in distilled water, the amount of substance of the sodium borohydride is equal to or greater than that of the Se powder, the mixture is heated to be completely dissolved, and a Se solution with the Se content of 0.01 to 0.75mol/L is manufactured; (2), zinc acetate and copper acetate are dissolved in the distilled water, the mole number of copper ions does not exceed 15% of that of zinc ions, thioglycollic acid is added into the mixture, the pH is regulated to 8 to 13, and a Zn solution with the Zn content of 0.01 to 0.1mol/L is manufactured; and (3), the manufactured Se solution is injected into the manufactured Zn solution, the mixture reacts for 1 to 5 hours in oil bath at 90 to 150 DEG C and is cooled to room temperature, ZnSe-to-Cu quantum point water solution is obtained, then isopropanol is added into the ZnSe-to-Cu quantum point water solution, and a ZnSe-to-Cu quantum point is obtained by centrifugation and separation. The invention has the beneficial effects that cheap raw materials are adopted to substitute an expensive and dangerous organic metal precursor, which is green and environment-friendly, and the preparation cost is reduced; and the water solution is used as a reaction solvent, thus the reaction temperature is reduced and the operation is simple and safe.

The invention discloses a methyltin composite heat stabilizer, which comprises the following components in part by weight: 38 to 68 parts of methyl tin mercaptide, 15 to 25 parts of antimonide based compound, 8 to 12 parts of organic stabilizer of metallic soap, 3 to 5 parts of epoxy compound, 2 to 5 parts of antioxidant, 3 to 8 parts of lubricating agent and 1 to 2 parts of chelant, wherein the methyl tin mercaptide is a composite in which the mass ratio of S,S',S''-tris(isooctyl thioglycollate)-methyltin to S,S'-bis(isooctyl thioglycolate) dimethyltin is 20:80. The methyltin composite heat stabilizer has the advantages of high quality, low toxin, environmental protection, low tin content in the formula, strong practicability and wide application range; and materials prepared from the methyltin composite heat stabilizer, such as PVC sheets, pipes and blown films have the advantages of excellent initial and long-term heat stability, good lubrication system, no precipitation and good oxidation resistance, wherein the sheets and the blown films have good transparency.

The invention discloses a preparation method and an application technology of a sulfydryl palm bark adsorbent. The method is characterized by comprising the following steps of: adding 30 to 45 mass percent of thioglycolic acid, 25 to 40 mass percent of tetrahydrofuran, 20 to 35 mass percent of alkalized palm bark, 0.5 to 2.5 mass percent of glacial acetic acid and 0.15 to 0.3 mass percent of concentrated sulfuric acid into a triangular flask with a plug, wherein the mass percent of the components is 100%; plugging the triangular flask; carrying out a stationary reaction for 48-60 hours at the temperature of 40-45 DEG C; then washing with deionized water and filtering under vacuum till the filtrate is neutral; washing with a small amount of ethanol; and drying in an oven at the temperature of 35-45 DEG C so as to obtain the sulfydryl palm bark adsorbent. The sulfydryl palm bark adsorbent has high metal iron absorbability and sulfydryl characteristics, and can absorb and elute various metal ions in water; the sulfydryl palm bark adsorbent is high in absorption efficiency and speed and good in physical, chemical and mechanical stability; due to the high regenerability of the sulfydryl palm bark adsorbent, the repeated use times of the sulfydryl palm bark adsorbent is higher than that of sulphydryl cotton by 40 percent; the cost is saved; and the environment pollution is avoided.

A chemical preparation method for a CdTe quantum dot fluorescent probe for detecting a trace amount of paraquat comprises the step of modifying thioglycollic acid on the surface of the CdTe quantum dot fluorescent probe emitting a red emission spectrum band so as to enable the CdTe quantum dot fluorescent probe is provided with carboxyl functional groups on the surface. The preparation process comprises the following two specific steps: firstly, preparing a NaHTe solution; then, synthesizing CdTe quantum dots of which the surfaces are modified with thioglycollic acid, and adjusting the pH value to be 10-12 with KOH, so as to obtain the CdTe quantum dot fluorescent probe. According to the invention, carboxyl with negative charge on the surfaces of the CdTe quantum dots and target paraquat molecules with positive charge have the electrostatic interaction through the positive charge and negative charge, when the CdTe quantum dots and the paraquat approach to each other in space, the red spectrum band emitted by the CdTe quantum dot fluorescent probe can be absorbed by green target analyte paraquat modules through the fluorescence resonance energy transfer principle, and the detection of a trace amount of paraquat can be implemented through the utilization of the variation of the CdTe quantum dot fluorescence intensity.

The invention discloses a flaky titanium dioxide/bismuth oxybromide composite photocatalyst and a preparation method thereof. The composite photocatalyst is a heterogeneous composite material formed by depositing bismuth oxybromide on a titanium dioxide nanometer sheet. The preparation method comprises the following steps: dispersing the titanium dioxide nanometer sheet, thioglycollic acid, potassium bromide in deionized water in an ultrasonic manner, uniformly mixing to obtain a solution, and dissolving bismuth nitrate in ethylene glycol to obtain a solution; mixing the two solutions obtained in the former step to obtain a milky emulsion, stirring, leaving the emulsion to stand, and performing centrifugal separation and washing to obtain the composite photocatalyst. In the preparation process, through adjusting ratio of titanium dioxide to bismuth oxybromide, composite structures in different particle diameters can be obtained. The composite photocatalyst is simple in preparation technology; particularly, through thioglycollic acid, bismuth oxybromide can be uniformly distributed on the titanium dioxide (TiO2) sheet; the composite photocatalyst shows a more excellent photocatalytic activity compared with that of the titanium dioxide nanometer sheet under visible light, and has the potential practical application prospect of photocatalytic degration of organic pollutants through solar power light in the processing technology.

The invention discloses a chloroprene rubber gasket with high abrasion resistance. The chloroprene rubber gasket comprises the following raw materials in parts by weight: 135-145 parts of chloroprene rubber (CR)121, 10-15 parts of butyl rubber CBK139, 20-25 parts of low density polyethylene, 3-5 parts of acetyl triethyl citrate, 2-5 parts of dibutyl maleate, 1-2 parts of isooctyl dimercaptoacetate di-n-octyl tin and the like. The chloroprene rubber gasket has the beneficial effects that the gasket has good high temperature resistance, sealability, flame retardance and corrosion resistance and can work in such medias as acid, alkali and oil for a long time; the volume and hardness of the gasket are small in variation; the gasket does not adhere to metal surfaces; and the gasket has small friction coefficient and good abrasion resistance and has the advantages of softness of bonding with sealing surfaces, good weathering aging and ozone aging resistance, durability and the like.

A process for preparing the cadmium sulfide nanorods includes proportionally adding mercaptoacetic acid to the solution containing cadmium ions, stirring, proportionally adding sodium sulfide, reaction at 100-500 deg.C for 1-200 hr, centrifugal treating, and drying. Its advantage is no environmental pollution.

The invention discloses an efficient polycarboxylic acid water reducing agent with modified celluloses. The efficient polycarboxylic acid water reducing agent comprises, by weight, 240-250 parts of methyl-2-buten polyoxyethylene ether, 25.2-26.0 parts of acrylic acid, 1.6-1.65 parts of ammonium persulfate, 0.53-0.55 part of thioglycolic acid, 13-14 parts of lignin, an appropriate quantity of sodium hydroxide solution with the concentration of 10 wt%, an appropriate quantity of deionized water, 26-28 parts of graphene oxide, 5-7 parts of waste liquid from sugar factories, 7-8 parts of hydroxypropyl methyl celluloses, 2-3 parts of polyacrylamide, 3-4 parts of calcium chloride, 2-3 parts of triethanolamine, 5-6 parts of carbon black, 19-22 parts of building brick residues and 1-1.2 parts of silane coupling agents kh550. The efficient polycarboxylic acid water reducing agent has the advantages that components such as the hydroxypropyl methyl celluloses, the polyacrylamide and the carbon black are added into the efficient polycarboxylic acid water reducing agent in preparation procedures by the aid of a series of treatment processes, accordingly, the flowability and the frost resistance of concrete can be improved, and the dispersion resistance of products in water further can be improved.

The invention provides a quantum dot fluorescent aspirin imprinted sensor and its preparation method and use and belongs to the technical field of material preparation and drug content detection. The preparation method comprises the following steps of preparing a precursor NaHTe solution from sodium borohydride, tellurium powder and water in an ultrasonic environment, injecting the precursor NaHTe solution into a CdCl2.2.5H2O solution fed with nitrogen for oxygen removal, having a pH value of 10.5-11.5 and containing thioglycollic acid (TGA), carrying out backflow reaction processes in a nitrogen protective atmosphere at a temperature of 100-110 DEG C to obtain quantum dots having different sizes according to different backflow time periods, and synthesizing a fluorescent molecule imprinted polymer from the CdTe quantum dots as fluorescent carriers, aspirin as a template molecule, (3-aminopropyl)triethoxysilane (APTES) as a functional monomer and tetraethyl orthosilicate (TEOS) as a cross-linking agent by a sol-gel method, wherein the fluorescent molecule imprinted polymer can be used for optical detection of aspirin. The fluorescent molecule imprinted polymer has good optical and pH stability and has an aspirin selective-identification function.

A layered structure having a first layer including a polymerization product of a monomer combination including a first monomer having at least two thiol groups at its terminal end and a second monomer having at least two carbon-carbon unsaturated bond-containing groups at its terminal end, wherein the first monomer includes a first thiol compound represented by Chemical Formula 1-1 including a thioglycolate moiety and a second thiol represented by Chemical Formula 1-2, and wherein the second monomer includes an ene compound represented by Chemical Formula 2:

Disclosed is a polymerizable composition for o an optical material containing tolylene diisocyanate, hexamethylene diisocyanate, and one or more polythiol compounds selected from the group consisting of 4-mercaptomethyl-1,8-dimercapto-3,6-dithiaoctane,4,8-, 4,7- or 5,7-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaundecane, pentaerythritol tetrakismercaptoacetate, pentaerythritol tetrakismercaptopropionate, 2,5-bis(mercaptomethyl)-1,4-dithiane, bis(mercaptoethyl)sulfide, 1,1,3,3-tetrakis(mercaptomethylthio)propane, 4,6-bis(mercaptomethylthio)-1,3-dithiane and 2-(2,2-bis(mercaptomethylthio)ethyl)-1,3-dithietane.

The invention relates to a method for preparing cefmetazole sodium, which comprises the following steps: (1) dissolving sodium hydroxide in water, adding mercaptoacetic acid and chloroacetonitrile into the mixture to perform the reaction, then adding sodium chloride and ethyl acetate into the reaction solution, stirring and dissolving the mixture, standing to separate phases and reserving a solvent phase for later use; (2) dissolving 7-MAC in methylene dichloride, adding organic base and side-chain solution into the mixture, stirring the mixed solution to perform the reaction to carry out phase separation, removing a water phase and carrying out secondary phase separation on the solvent phase to obtain cefmetazole benzyl ester; (3) dissolving ferric trichloride in aether, adding methylene dichloride in the mixture, dropwise adding the obtained product into cefmetazole acid to perform the reaction for 0.5 to 1 hour, then carrying out phase separation, removing the water phase, carrying out back extraction of alkali liquor on the solvent phase, then reserving the water phase, adding seed crystals, stirring the product and carrying out crystallization to obtain cefmetazole acid; and (4) dissolving the cefmetazole acid in alkali water and freezing out the mixture to obtain cefmetazole sodium. The preparation method of the invention has the advantages of 58 to 62 percent of yield, low cost, environment-friendly property, 92 percent of product purity, suitability for industrial production and the like.

The invention discloses a pillar 5 arene polymer with fluorescence detection and mercury ion removal functions. The pillar 5 arene polymer is obtained through steps of carrying out reflux reaction on copolymerized pillar 5 arene and ethyl thioglycolate as raw materials to obtain functionalized pillar 5 arene carrying out reflux reaction on the functionalized pillar 5 arene and hydrazine hydrate as the raw materials to obtain pillar 5 arene; enabling the pillar 5 arene to react with terephthalaldehyde to obtain a yellow-green sediment; and filtering, washing and drying to obtain the pillar 5 arene polymer. According to the polymer, a good fluorescent signal base is provided for a benzene ring group of the pillar 5 arene, yellow-green fluorescent light of the polymer is quenched through complexing a sulphur atom and a mercury ion, and fluorescent recognition of the mercury ion is achieved. The polymer has the characteristic of being difficult to dissolve into a water solution and an organic solution, and the mercury ion can be separated from a water phase, thereby achieving the purpose of removing the mercury ion.

The invention relates to an exterior wall coating which comprises the following raw materials in parts by weight: 80-90 parts of a water based acrylic emulsion, 15-20 parts of a styrene-acrylic emulsion, 30-60 parts of nano bentonite, 3-4 parts of sodium carboxymethylcellulose, 2-3 parts of butyl methacrylate, 1-2 parts of dimethyl dimercaptoacetic tin isooctylate, 0.6-1 part of phenethyl phenol polyoxyethylene ether, 0.5-1 part of glass fiber, 0.8-1 part of 1, 2-di(triethoxy silicon base) ethane, 0.1-0.2 part of tributyl phosphate, 3-5 parts of a coalescing agent and 10-20 parts of deionized water. The produced coating disclosed by the invention is less in raw material loss, less in gel generation, simple in process, hard in film, good in luster, strong in impact resistance, difficult to crack, flexible in texture, strong in decoration, high in weather resistance and washing resistance, strong in adhesive force, long in service life, and free from special smell, heavy metals such as mercury and lead, and formaldehyde volatiles, so that the coating is in accordance with technical demand of environmental-friendly coatings. The coalescing agent is added, so that the coating is very high in stability, and efficient in adhesiveness and film-forming property. The compactness of the coating film is increased, and the film-forming quality is improved, so that a film has the advantages of strong adhesive force, no holes and rifts, uniform compactness and the like.

The invention discloses a flame-retardant type cable sheath insulation material and a preparation method thereof. The flame-retardant type cable sheath insulation material comprises the following raw materials in parts by weight: 94-102 parts of neoprene CR121, 16-21 parts of chlorinated polyethylene, 16-22 parts of semi-reinforcing carbon black N774, 2-4 parts of magnesium oxide, 1-2 parts of glass powder, 32-36 parts of mica powder, 1-2 parts of anti-aging agents MB, 1-2 parts of 2-thiol-group benzimidazole, 5-7 parts of polyamide wax micropowder, 1-2 parts of accelerants DM, 0.8-1 part of accelerants TMTD, 18-23 parts of kaolin, 1-3 parts of adipic acid propanediol polyester, 2-4 parts of zinc borate, 4-6 parts of talcum powder, 0.8-1 part of zinc oxide, 2-3 parts of modified calcium carbonate, 5-6 parts of antimony trioxide, 4-6 parts of ethylene thiourea, 4-6 parts of ethylene bis stearamide, 0.7-0.9 part of di-n-octyltin bis(isooctyl thioglycollate) and 0.5-0.8 part of bis(P,P-bis-ethylhexyl diphosphato) ethanediolato titanate. The flame-retardant type cable sheath insulation material disclosed by the invention has characteristics superior to those of common rubber and flame-retardant rubber, namely, the flame-retardant type cable sheath insulation material disclosed by the invention has the property of common silicon rubber at normal temperature, and a rigid shell after is formed being ablated by high temperature flames so as to protect the burnt object not to be damaged.

The invention discloses polyvinyl chloride synthetic leather, which comprises a face layer, a foaming layer, a bonding layer and a brushing fabric. The polyvinyl chloride synthetic leather is characterized in that the face layer is made of slurry prepared from the following raw materials in parts by weight: 40-50 parts of SG-1 type PVC (polyvinyl chloride), 70-80 parts of SG-6 type PVC resin, 20-25 parts of phthalate, 15-20 parts of sebacic propylene glycol polyester, 20-25 parts of n-butyl methacrylate, 5-6 parts of PVC color paste, 1-2 parts of imarcaptoacetate dioctyltin, 1-2 parts of zinc stearate, 5-10 parts of light calcium carbonate and 35-50 parts of modified attapulgite. According to the invention, through formula and process improvement, the toughness of the synthetic leather is increased, and the polyvinyl chloride synthetic leather has natural and comfortable handfeel similar to that of natural leather; and the polyvinyl chloride synthetic leather is not easy to damage or tear within 3-5 years.

The invention discloses a polyvinyl chloride (PVC) tube containing modified attapulgite and a preparing method thereof. The PVC tube containing the modified attapulgite is composed of raw materials comprising, based on the weight part ratio, 65-70 parts of SG-7 type PVC resin, 40-45 parts of high density polyethylene, 1-3 parts of poly-4-methyl-1-pentene, 2-4 parts of methyl methacrylate-butadiene-styrene terpolymer, 1.3-1.8 parts of alkylphenol ethoxylates, 2-3 parts of modified attapulgite, 25-30 parts of light calcium carbonate, 1-1.5 parts of dimethyl dimercapto acetic acid ethylhexyl acrylate stannum, 1.3-1.8 parts of diisobutyl phthalate, 0.9-1.1 parts of fungacetin, 1-2 parts of zinc sulfide and 0.4-0.6 part of methyl triethoxysilane. According to the PVC tube containing the modified attapulgite and the preparing method, a formulation is further optimized, the composition of the modified attapulgite is added in the formulation, and therefore dispersion of inorganic fillers is promoted and fluidity of PVC fusant is improved during the manufacturing process of the PVC tube, and furthermore tensile strength and breaking elongation are improved, toughness is good and hardness is low. In addition, the preparing method is simple and effectively applied to every walk of life.