251 results about "Dodecylmercaptan" patented technology

The invention discloses a method for preparing nano copper powder, which comprises the following steps of: compounding copper sulfate, lauryl sodium sulfate and polyoxyethylene sorbitan monooleate in a molar ratio of 1:0.5-2:0.05-0.3, dissolving the mixture in water, blending the aqueous solution and lauryl mercaptan-containing benzene solution in a molar ratio of copper sulfate to lauryl mercaptan of 1:0.5-2, and uniformly stirring; pouring the emulsion fluid into an electrolytic bath, taking pure copper as an anode and stainless steel as a cathode, and regulating the pH value to between 0.5 and 4; supplying direct current to the anode and the cathode to ensure that the lauryl mercaptan dissolved in an electrolyte performs in-situ clad on precipitated copper atoms, the generated copper powder loosely attaches to the surface of the cathode, copper ions near the anode are continuously migrated to the place near the cathode under the action of diffusion and directional migration of electric charge at the same time, and the electrolytic time is 30 to 120 minutes; adding the cathode to which the copper powder is attached into absolute ethyl alcohol, and putting the cathode in an ultrasonic cleaner for desorption by using ultrasonic waves for 5 to 20 minutes to obtain dark purple copper solution; and filtering the solution, and drying the filtrate for 1 to 3 hours at the temperature of between 60 and 100 DEG C in a vacuum environment to obtain brown powder, namely a nano copper composite.

The invention discloses an anti-oxidation metal surface treatment agent. The anti-oxidation metal surface treatment agent consists of the following raw materials in parts by weight: 13-20 parts of polyvinyl alcohol, 0.4-1 part of tea saponin, 0.8-1 part of sodium citrate, 0.2-0.3 part of lauryl mercaptan, 0.1-0.3 part of 2-thiol group benzimidazole, 0.1-0.2 part of antioxidant BHT, 0.4-1 part of calcium lignosulphonate, 2-3 parts of amino tri(methylene phosphonic acid), 6-8 parts of sericin, 0.08-0.1 part of boric acid, 10-20 parts of methyl benzotriazole, and 180-200 parts of de-ionized water. The water soluble high-molecular polyvinyl alcohol is mixed with the sericin and is modified by the boric acid to improve the tensile strength and the heat stability of a blended membrane; corrosion inhibition alkali liquid using the methyl benzotriazole as a main material is added, so that the film attached on the metal surface is more uniform and stable to protect a metal material from being corroded by harmful media in atmosphere and water so as to achieve a better corrosion inhibition effect; and the added 2-thiol group benzimidazole and antioxidant BHT can improve the oxidation resistance of the metal surface treatment agent.

The invention relates the Au/CdSe heterostructure quantum point and preparing method, comprising the following steps: extracting HAuCl4*4H2O solution with toluene solution, stewing, washing the toluene solution, adding them into dodecanethiol, stirring, and getting gold solution; mixing the toluene solution and gold solution, and stirring; purifying, and getting the product composed by Au particle whose grain size is 2.0nm and CdSe particle whose grain size is 3.4nm. The invention has the advantages of metal and semi-conductor light absorption feature and dissymmetrical structure. The product can be used in nanometer electron device, light sensor and solar battery.

The invention discloses a heat-resisting waterproof wallpaper. The heat-resisting waterproof wallpaper comprises a base material layer, a waterproof layer and a heat-resisting layer, wherein the heat-resisting layer is made of waterborne silicon-acrylate resin, hydroxyl-polyacrylate emulsion, cellulose acetate butyrate solution, amino resin, iron oxide red, iron oxide yellow, pearl powder, lauryl mercaptan, dimethylethanolamine, thiethylamine, triethanolamine, 2-amino-2-methylpropanol, ammonium hydroxide, acrylic glycidyl ether, ethylene glycol monobutyl ether, waterborne aluminum powder, charcoal powder, talcum powder, sodium bicarbonate, glass fiber, vermiculite powder, perlite powder, EVA (ethylene-vinyl acetate copolymer) wax, polyethylene wax, nano titanium dioxide, waterborne polyisocyanate curing agent, wetting agent, magnesium stearate, polyoxypropylene glycerol ether, carboxymethyl cellulose and anti-setting agent. The invention also discloses a preparation method of the heat-resisting waterproof wallpaper. The prepared heat-resisting waterproof wallpaper is excellent in heat-resisting and waterproof performance.

The present invention provides aqueous amphiphilic emulsion copolymer compositions comprising one or more aqueous phase copolymer, a residue of one or more hydrophilic chain transfer agent, and a residue of one or more hydrophobic chain transfer agent, as well as methods of making such copolymers in water or an aqueous liquid by copolymerizing a monomer component of from 20 to 80 wt. %, based on the weight of the monomer component, of a hydrophilic group-containing monomer and the remainder of a copolymerizable ethylenically unsaturated monomer or prepolymer in the presence of a mixed chain transfer agent component comprising a hydrophilic chain transfer agent, such as 3-mercaptopropionic acid, and a hydrophobic chain transfer agent, such as N-dodecyl mercaptan. The aqueous amphiphilic emulsion copolymers of the present invention are storage stable and exhibit excellent viscosity control even in high solids compositions, e.g. from 50 to 80 wt. % of the composition. The high solids compositions can be diluted at the point of use, thus reducing shipment costs.

The invention discloses a resin for UV-cured strippable protection film, a preparation method and applications thereof. The preparation method comprises the following steps: adding the following monomers: methyl methacrylate, butyl acrylate, acrylic acid, hydroxypropyl acrylate, isooctyl methacrylate, and azodiisobutyronitrile into an organic solvent, evenly mixing to obtain a mixed solution, introducing nitrogen gas into the mixed solution; adding part of the mixed solution into a four-mouth flask, carrying out reactions; dropwise adding the rest mixed solution and lauryl mercaptan, keeping on reactions; dissolving azodiisobutyronitrile by an organic solvent, then dropwise adding into the four-mouth flask, carrying out reactions; cooling the solution, dropwise adding diisocyanate, heating to carry out reactions; after cooling, dropwise adding a mixed solution of hydroxy acrylate and a polymerization inhibitor, heating; adding monohydric alcohol, cooling, and discharging the product. The provided resin can be easily peeled off from the surface of steel or glass. Furthermore, the UV curing system is more environment-friendly, the resin is nontoxic and harmless, the curing time is short, the resin can be cured within 10 seconds to form a film, and the production efficiency is largely improved.

The invention discloses a water-resistant fireproof coating. The coating comprises the following raw materials by weight: 20 to 50 parts of self-crosslinking elastic acrylic emulsion, 5 to 10 parts of copolymer emulsion of vinyl acetate and ethylene, 10 to 25 parts of a flame retardant, 10 to 25 parts of a pigment filler, 2 to 10 parts of propylene glycol, 0.2 to 1 part of 2-ethyl-4-methylimidazole, 0.5 to 1 part of polyvinylpyrrolidone, 0.2 to 1 part of sodium carboxymethylcellulose, 0.2 to 1.5 parts of 1,2-benzisothiazol-3-one, 0.3 to 1.2 parts of dodecyl mercaptan, 0.1 to 0.8 part of dodecyl dimethyl benzyl ammonium chloride, 0.5 to 1.5 parts of a defoaming agent, 0.5 to 2 parts of aluminium triphosphate and 25 to 40 parts of water. The water-resistant fireproof coating provided by the invention has the advantages of high strength, excellent fireproof property and water resistantce, strong adhesive force with a substrate, high bonding strength and long service life.

The invention relates to the technical field of waterborne adhesives and in particular relates to rewetting repairable modified waterborne white latex and a preparation method thereof. A formula comprises the following components: 35.0 to 50.0 parts of de-ionized water, 10.0 to 20.0 parts of protective colloid polyvinyl alcohol, 0.5 to 2.5 parts of a non-ionic emulsifier, 0.5 to 2.5 parts of a buffering agent, 0.5 to 1.5 parts of a persulfate initiator, 0.01 to 0.05 part of a chain transfer agent dodecyl mercaptan, 25.0 to 54.0 parts of vinyl acetate, 5.0 to 15.0 parts of butyl acrylate, 5.0 to 15.0 parts of a carboxyl-containing polymerizable monomer, a crosslinking agent and the like. Compared with the prior art, the white latex provided by the invention can be used for realizing secondary adhesion through the effect of water and the technical difficult in the prior art that the white latex cannot be repaired after the white latex is cured into a film is overcome; the wet-state adhesion performance of the white latex is greatly improved; the rewetting repairable modified waterborne white latex has the advantages of rapid rewetting viscosity response, good initial adhesion positioning and high bonding strength.

The invention relates to a method for preparing acrylonitrile butadiene-styrene (ABS) resin through double peak emulsion grafting, which comprises the following steps of: adding polybutadiene latex with big particle diameter, polybutadiene latex with ultra-large particle diameter, and partial emulsifier, styrene, acrylonitrile, tert-dodecylthiol and desalted water into a reactor, and controlling the temperature to be 30-80DEG C; when the temperature is raised to 35-50DEG C, adding partial activator and oxidant; reacting for 0.5 to 2 hours, and adding the rest emulsifier, styrene, acrylonitrile, tert-dodecylthiol and desalted water within 1 to 5 hours; and adding the rest activator and oxidant, curing for 0.5 to 2 hours, and finishing the reaction to obtain low-gloss ABS latex.

The invention relates to a method for preparing doublet acrylonitrile butadiene styrene (ABS) resin. Styrene-butadiene latex with small diameter and butadiene latex with large diameter are fully stirred and mixed together and are added with part emulsifier, styrene, acrylonitrile, dodecyl mercaptan and desalted water at the temperature of 40-80 DEG C, when the temperature is heated to 42-50 DEG C, part activator and cumyl hydroperoxide are added to react for 0.5-2 hours, a continuous feeding mode is adopted to add the residual emulsifier, styrene, acrylonitrile, dodecyl mercaptan and desalted water in 1-3 hours, the activator and the cumyl hydroperoxide are added to cure for 0.3-1 hour, the obtained ABS latex is added into concentrated sulphuric acid at the temperature of 80-98 DEG C for 5-20 minutes, coagulating, filtering and drying are carried out so as to obtain dry powder, the dry powder is mixed with styrene-acrylonitrile copolymer (SAN), and an extruding machine is used to extrude and pelletize so as to obtain an ABS finished product. The impact strength, tensile strength and gloss of the resin are all improved.

The invention relates to a preparing method for a fine copper hydrophobic surface with wetting anisotropy. According to the method, copper sulfate serves as plating solution main salt, copper foil is pretreated so that surface oil dirt and grease can be removed; then the pretreated copper foil is etched through a physical etching method; then brush plating treatment is conducted; and finally, the copper foil is then put into an ethanol solution of dodecylthiol to be soaked, a super-hydrophobic film is generated on the coarse surface of fine copper in a self-assembling manner, then washing and drying are conducted, and the fine copper hydrophobic surface with a micron, sub-micron and nanometer three-grade graded structure is finally obtained. The prepared super-hydrophobic surface structure is very similar to a rice leaf surface structure and has the anisotropic wetting performance achieved on the surface of a rice leaf. The preparing method is relatively novel and simple in technology, the structure is relatively easy to control, the cost is relatively low, and a very wide application prospect is achieved.

The invention relates to a method for preparing a fluorine-containing anti-fingerprint agent. The method comprises the following steps of by adopting perfluoroalkyl ethyl methacrylate, 3-(methacryloxy)propyl trimethoxysilane and methyl methacrylate as reaction substrates, dodecyl mercaptan as a chain transfer agent and diisopropyl peroxydicarbonate as an initiator and in the presence of a solvent, initiating polymerization reaction for a reaction time of 1-2 hours, controlling the reaction temperature at 30-40 DEG C to prepare a crude product; carrying out reduced pressure distillation to remove the solvent to obtain a perfluoroalkyl silane compound; and diluting the perfluoroalkyl silane compound into a 0.1% (by mass concentration) solution with hydrofluoroether to obtain the finished product, namely, fluorine-containing anti-fingerprint agent. The method has the advantages of mild reaction conditions, no need of precious metal catalyst, safe and easily available raw materials, simple process, good safety and low production costs and is conducive to industrial production.

The invention provides a preparation method of pentaerythritol tetra(3-n-dodecylthiopropionate), which initially provides a one-step synthesis method of pentaerythritol tetra(3-n-dodecylthiopropionate) from pentaerythritol tetraacrylate and 1-dodecyl mercaptan. The method comprises the following steps: adding 1-dodecyl mercaptan and a catalyst into a reactor, dropwisely adding pentaerythritol tetraacrylate at 40-60 DEG C to react, distilling out excessive 1-dodecyl mercaptan under reduced pressure, adding formic acid or glacial acetic acid to regulate the pH value to 6-7, adding a crystallization solvent to recrystallize, filtering, and drying to obtain the white crystalline powder product. Compared with the prior art, the novel method provided by the invention has the advantages of simple technique, low equipment and operation cost, energy saving, environmental protection, high product quality and high yield.