113results about How to "Guaranteed reactivity" patented technology

The invention discloses a method for preparing nanometer aluminum composite powder coated with nitro-cotton. The method includes the steps of: dispersing nanometer aluminum powder into absolute ethyl alcohol; adding silane coupling agent with the weight accounting for 5-10% of that of the nanometer aluminum powder to obtain nanometer aluminum powder treated by the silane coupling agent; dissolving the nitro-cotton and plasticizer into ethyl acetate or acetone; dispersing the nanometer aluminum powder treated by the silane coupling agent into cyclohexane to form cyclohexane dispersing agent; adding nitro-cotton liquor into the cyclohexane dispersing agent and evenly mixing the nitro-cotton liquor; and performing filtering and vacuum drying to obtain the nanometer aluminum composite powder coated with the nitro-cotton, wherein the weight of the nitro-cotton is 0.04-0.15 time that of the aluminum powder, and the weight of the plasticizer accounts for 3-10% of that of the nitro-cotton. The nanometer aluminum powder is firstly treated by the silane coupling agent and then coated with the nitro-cotton, the surface of the nanometer aluminum powder is effectively coated with the nitro-cotton, the activity of the nanometer aluminum powder can be kept, and the oxidation resistance of the nanometer aluminum powder is improved.

The invention provides a selective hydrogenation method of alkyne and alkadiene in a C4 hydrocarbon material flow. The method provided by the invention comprises the following steps of: adding the C4 hydrocarbon material flow containing alkyne and/or alkadiene and hydrogen gas into a hydrogenation reactor which is filled with a load type palladium catalyst; carrying out the selective hydrogenation on the alkyne and/or alkadiene in the C4 hydrocarbon material flow to form olefin when an inlet temperature is in a range of 10-80 DEG C, a mol ratio of the hydrogen gas to the sum of the alkyne and the alkadiene is 1-10 and a reaction pressure is in a range of 0.1-4 Mpa, and removing the olefin, wherein the load type palladium catalyst comprises a carrier, palladium and selective modified components; testing the load type palladium catalyst by utilizing a carbon monoxide adsorption in-situ infrared spectroscopy at the temperature of 40 DEG C to obtain an area ratio of a bridge type absorption peak at the 1930-1990cm<-1> to a bridge type absorption peak at the 1870-1930cm<-1> in an obtained infrared spectrogram is less than 0.2, more preferably less than 0.15. The method provided by the invention has a high selectivity to the selective hydrogenation of the alkyne and the alkadiene in the C4 hydrocarbon material flow and can be operated for a long period.

The invention provides a selective hydrogenation method of alkyne and dialkene in an alkene stream. The method comprises the steps that: an alkene stream containing alkyne and/or dialkene, and hydrogen are delivered into a hydrogenation reactor provided with a supported palladium catalyst; alkyne and/or dialkene in the alkene stream are hydrogenated into alkene under conditions of: a temperature in of 10 to 80 DEG C, a molar ratio of hydrogen to a total amount of alkyne and dialkene of 1 to 10, and a reaction pressure of 0.1 to 4 Mpa, such that alkyne and/or dialkene in the alkene stream are removed. The supported palladium catalyst comprises a carrier, palladium and optional modifying components. With a carbon monoxide adsorption in situ infrared spectroscopy method, the catalyst is tested under a temperature of 40 DEG C. In an obtained infrared spectrogram, an area ratio of an overhead absorption peak at a location of 1983 to 1990cm-1 to that at the location of 1870 to 1930cm-1 is lower than 0.2, and preferably 0.15. The method provides a high selectivity in the selective hydrogenation of alkyne and dialkene. The method can operate for a long period.

The invention relates to a magnesium oxide for high magnetic induction grain-oriented silicon steel, in particular to a low-hydration magnesium oxide coating for high magnetic induction grain-oriented silicon steel. The low-hydration magnesium oxide coating comprises the following components in parts by mass: 10-15 parts of special magnesium oxide, 0.5-1.5 parts of titanium dioxide, 0.001-0.005 part of a low-melting-point antimony compound, 0.001-0.005 part of a water repellent agent which is silicon micro powder, and 80-90 parts of deionized water. The components are mixed for 60-90 minutes at a stirring state of 1000-1500r/min, and then, the low-hydration magnesium oxide coating is prepared at a reaction temperature of 0-5 DEG C. According to the low-hydration magnesium oxide coating for high magnetic induction grain-oriented silicon steel, the water repellent agent is adopted to restrain hydration of the magnesium oxide, so that water which is taken into a steel coil because of Mg(OH)2 is reduced, and a uniform magnesium silicate bottom layer is formed, and therefore, consistency of a dew point among steel coil layers is guaranteed, and a peroxidation phenomenon is avoided.

The invention provides a spraying polyurea elastic anticorrosive paint, and a preparation method thereof. The spraying polyurea elastic anticorrosive paint comprises, by weight, a component A and a component B; the component A comprises 30 to 40 parts of polyether polyol N220, 10 to 20 part of polyether polyol N330, and 30 to 60 part of isocyanate MDI-50; the component B comprises 40 to 60 parts of amine-terminated polyether D-2000, 5 to 10 parts of amine-terminated polyether T-5000, 10 to 20 parts of amino chain extender E-100, and 20 to 30 parts of amino chain extender 6200. The spraying polyurea elastic anticorrosive paint possesses high frequency impact resistance, no shedding or cracking is caused after 2 million times of impacting; the bonding strength is 10Mpa or higher; 3000h saltspray resistance test is passes; the physical strength is high (>=19Mpa), the physical elongation percentage is high (>=450%), the impact resistance is excellent, and the other physical mechanical properties are capable of satisfying requirements in spraying polyureas protection material standard.

The invention relates to a method of preparing fluorine-containing olefin, and belongs to the technical field of organofluorine chemistry. The method comprises the following steps: firstly adding non-alcohol organic solvents, water and a metal dechlorinating agent with grain size of 40-150 microns into a container for stirring and mixing, and then rising the container temperature to 45 DEG C-65 DEG C; then, adding the chlorine-fluorine alkane material and keeping the temperature at 50 DEG C-80 DEG C; finally, rectifying to obtain the fluorine-containing olefin product. The method disclosed by the invention ensures that the dechloridation reaction can be kept at a certain reaction speed from beginning to end, has the advantages of being safer and more efficient, and is suitable for industrial production.

The invention relates to a process for the production of di- and polyisocyanates of the diphenylmethane series and mixtures thereof, in which aniline and formaldehyde are reacted in the presence of an acid catalyst to form di- and polyamines of the diphenylmethane series; the di- and polyamines of the diphenylmethane series are phosgenated, optionally in the presence of a solvent, to obtain a crude di- and polyisocyanate; from the crude di- and polyisocyanate, at least one fraction containing at least 5 wt. % 3-ring and multi-ring MDI and at least one fraction containing at least 95 wt. % 2-ring MDI are separated by distillation, and the acidities of the fraction containing at least 5 wt. % 3-ring MDI and multi-ring MDI, and/or the fraction containing at least 95 wt. % 2-ring MDI are determined analytically; and an acidic compound is added to the fraction containing at least 5 wt. % 3-ring MDI and multi-ring MDI, and/or the fraction containing at least 95 wt. % 2-ring MDI, so that the desired acidity is achieved.

The invention relates to a waterborne epoxy curing agent for waterborne epoxy resin as well as a preparation method and an application method of the waterborne epoxy curing agent. Mercapto and amino groups are taken as curing reaction groups of the waterborne epoxy curing agent, a curing agent structure comprises a tertiary amine structure which can be dispersed or dissolved in water. Compared with a polyamine curing agent, the prepared quick-drying curing agent is faster in curing and better in impact resistance and can realize low-temperature curing; compared with a thiol curing agent, the prepared quick-drying curing agent is faster in curing, and hardness, bending performance and impact resistance of a film are improved remarkably.

The invention discloses a supported palladium catalyst with characteristic of specific infrared absorption, comprising a carrier, palladium and optional modifying component. For finding a noble metal catalyst with good catalytic performance accurately and effectively, the carbon monoxide adsorption in-situ infrared spectroscopy is used for testing the catalyst at the temperature of 40 DEG C, in the obtained infrared spectrum, the ratio of the area of a bridge type absorption peak at the value of 1930-1990 cm<-1> to the area of a bridge type absorption peak at the value of 1870-1930 cm<-1> is less than 0.2, and more preferably 0.15. In addition, preferably, the ratio of the peak height of an absorption peak at the value of 1870-1930 Cm<-1> in the in-situ infrared spectrogram obtained by testing the catalyst when being purged with nitrogen gas for 0 min to the peak height of an absorption peak at the value of 1800-1900 cm<-1> in the in-situ infrared spectrogram obtained by testing the catalyst when being purged with nitrogen gas for 15 min is less than 5, and more preferably 2. The catalyst has excellent reaction selectivity and activity, and the preparation method of the catalyst is easy to operate and saves energy.

The invention provides a selective hydrogenation method for allylene and allene in propylene material flow. The method comprises the following steps of: introducing the propylene material flow containing 1-(methylamino)-2,3-propanediol (MAPD) and hydrogen into a hydrogenation reactor filled with a supported palladium catalyst, and performing selective hydrogenation on the MAPD in the propylene material flow at the inlet temperature of between 10 and 80 DEG C and a molar ratio of the hydrogen to the MAPD of 1-5 under the reaction pressure of 0.1-4Mpa, so that the MAPD becomes propylene and is removed, wherein the catalyst comprises a carrier, palladium and optional modifying components; and a carbon monoxide adsorption in situ infrared ray spectroscopy is used for testing the catalyst at 40DEG C, and an area ratio of a bridge absorption peak at a position of 1,930-1,990cm<-1> to a bridge absorption peak at a position of 1870-1,930cm<-1> in an infrared spectrum is less than 0.2 and preferably less than 0.15. By the method, the selective hydrogenation reaction for the allylene and allene in the propylene material flow has high selectivity, and can be stably performed for a long period.

The invention belongs to the field of enclosed type aromatic isocyanate aqueous dispersion preparation, and provides a preparation method of an enclosed type aromatic isocyanate aqueous dispersion. The invention aims at solving a technical problem of poor stability of existing aromatic isocyanate aqueous dispersion preparation methods. The method provided by the invention comprises steps that: 1, polyhydric alcohol is dried by baking; 2, polyhydric alcohol and dimethylol propionic acid are added into a solvent, and are stirred; nitrogen is delivered into the solution; the solution is heated, and the temperature is maintained for 15-45min; 3, aromatic isocyanate is dropped into the solution; 4, a blocking agent is added to the solution; 5, triethanolamine is added to the solution, and deionized water is added to the solution; the solution is emulsified, and nitrogen delivering is stopped; 6, the solvent A is removed. The enclosed type aromatic isocyanate aqueous dispersion prepared by the invention can be directly used as a single-component environment-friendly adhesive and a paint in fields of aqueous adhesive and wooden lacquerware. The enclosed type aromatic isocyanate aqueous dispersion can also be prepared into a molding resin cross-linking curing agent and a molding resin auxiliary agent in fields such as enameled wire and fabric.

The invention relates to a hydrogenation deoxygenation catalyst for the deoxygenation reduction of an oxygen-containing organic compound. The catalyst is spherical, comprises elements such as P, B, F, K, Zn, Zr, Mo, Fe, Cu, Ni and the like, has the diameter of 2 to 4mm, the specific surface area of 100 to 280m<2>/g, the pore volume of 0.45 to 0.85ml/g, the pore size distribution of 12 to 30nm, and the crushing strength of 180 to 320N/cm, and can be used for the common dynamic continuous hydrogenation reaction process and intermittent hydrogenation reaction; reaction materials can be gas-phase or liquid-phase materials; and operation process conditions are that: hydrogen partial pressure is 1.5 to 4.5MPa, the temperature is 200 to 450 DEG C, the space velocity is 0.5 to 3.5v/v, and the ratio of hydrogen to oil is 100 to 600h<-1>. Product yield is over 96 percent when the catalyst is used for hydrogenation deoxygenation reaction, and the catalyst has high reaction activity, stability and selectivity.

The invention provides a hardness removing device and method for a waste liquid by electric flocculation. The hardness removing device for the waste liquid by electric flocculation comprises a bufferadjusting tank, an electric flocculation reaction tank, a water quality adjusting tank and a sedimentation separation tank which are sequentially communicated; a stirrer is arranged in the buffer adjusting tank; water quality online detection systems are arranged at the inlet of the electric flocculation reaction tank and inside the electric flocculation reaction tank respectively; each system isprovided with an automatic water collection and distribution system, a multi-probe online monitoring device and a microcomputer program control module, wherein water quality and indices of pH, TDS andORP are termly and automatically monitored and fed back to the microcomputer program control module, so that the chain control of reagent addition, aeration intensity and water quality monitoring isrealized; iron or aluminum is adopted as an anode material in the electric flocculation reaction tank, and a pulse type power supply is used for supplying power; the water quality adjusting tank is used for adjusting the pH value of the waste liquid; and the sedimentation separation tank is an inclined tube sedimentation separation tank. According to the invention, the removal efficiency of hardness ions can be effectively improved, and the total hardness removal rate of the waste liquid can reach 80% or above stably.

The invention discloses resin for pultrusion of a carbon fiber composite material. The resin comprises 30%-60% of an epoxy resin system, 10%-30% of an unsaturated resin system, 2%-5% of a flexibilizer, 3%-5% of an internal releasing agent, 5%-10% of an active diluent and 3%-8% of chopped conductive fibers. The method can be used for pultrusion of the electromagnetic shielding carbon fiber composite material, meets the requirements of low reaction viscosity, high activity and good strength of a resin system in the pultrusion process, and can utilize the fiber conductive enhancer in the resin system to supplement the defect that the electromagnetic performance of the material is independently improved by the reinforced fibers. By optimizing the combination of the resin and combining with thepultrusion electromagnetic shielding carbon fiber plate, the effect that the shielding effectiveness is greater than 40dB under 150KHz-18GHz is achieved. Meanwhile, due to the particularity of the fiber conductive enhancer in the resin, the invention provides a pultrusion process method using the resin system.

The invention discloses a preparation method of weather-resistant aluminum alloy wood grain transfer printing sections. The method comprises the steps of surface treatment on aluminum alloy base materials, electrostatic spraying and solidification of wood grain transfer printing paint and wood grain transfer printing; in the electrostatic spraying process of the wood grain transfer printing paint,the wood grain transfer printing paint is prepared from polyester resin, epoxy resin, acrylic resin, nano cellulose, precipitated barium sulfate, montmorillonite, nano titanium dioxide, fumed silica,calcium carbonate, nano-alumina, glycerin, tetraethylammonium bromide, triglycidyl isocyanurate, a leveling agent, benzoin, polyethylene wax, pigment and an ultraviolet absorber UV-0. The preparationmethod of the weather-resistant aluminum alloy wood grain transfer printing sections is simple in process and mild in condition, and the obtained aluminum alloy wood grain transfer printing sectionsare good in weather resistance and excellent in heat resistance.