55results about How to "Limit migration" patented technology

The invention discloses a synthetic method of a transparent water-whitening resistant polyacrylate emulsion. The synthetic method is as follows: uniformly mixing an emulsifier, a soft monomer, a hard monomer and a functional monomer to obtain a monomer mixed liquor containing the emulsifier; adding deionized water in a reactor, heating to a preset temperature, adding 30wt%-50wt% of an initiator, stirring for 5min, dropping the monomer mixed liquor, dropping for 2-5h; after the monomer mixed liquor is added for 30min, dropping the rest of the initiator, dropping for 2-5h, controlling the reaction temperature to be 70-90 DEG C, keeping warm for 0.5-1 h; cooling to 60 DEG C, adding tert-butyl hydroperoxide and sodium formaldehyde sulfoxylate, continuing to react for 0.5h, cooling to 45 DEG C, and adding ammonium hydroxide for adjusting the pH value to be 6-8. According to the synthetic method, a monomer pre-emulsification step is omitted in an emulsion polymerization process, the operation is simpler, the energy consumption is reduced, the work efficiency is improved, and at the same time, the emulsion has excellent performances and a good water-whitening resistant characteristic.

The invention discloses an alkali-activated cementing material and a preparation method thereof, and belongs to the field of buildings. The method comprises the following steps: (1), weighing raw materials, wherein the raw materials include powder, water solution of a liquid activator and an aluminum-containing addition agent, the powder is formed by roasted bauxite separation tailing and slag powder which are mixed according to the mass ratio of (7 to 8):(3 to 2), the mass of the water solution of the liquid activator is 4 to 5% that of powder according to the mass of Na2O, the mass of the aluminum-containing addition agent is calculated according to the mass of the Na2O, the aluminum-contained addition agent is weighed, and a molar ratio between the Na2O and Al2O3 is (0.9 to 1.3):1; (2), evenly mixing the powder and the aluminum-containing addition agent to obtain a solid raw material, and evenly mixing the solid raw material with the water solution of the liquid activator to obtain the alkali-activated cementing material, wherein a mass ratio between water in the raw materials and the solid raw materials is 0.4 to 0.5. The method has the advantage of being low in alkali dissolution quantity.

The invention relates to a metal catalyst which comprises: 1) a nano TiO2 modified porous material as a composite carrier, and 2) a nano particle of at least one out of Pd and other transition metals as an active component, wherein the active component and TiO2 in the composite carrier have strong metal-carrier interaction to form a Pd@TiO2 structure or a Pd-M@TiO2 structure, thereby forming the Pd-M@TiO2/porous carrier catalyst, and M is at least one out of the transition metals except Pd. The invention further relates to a preparation method of the catalyst, and an application of the catalyst in preparing cyclohexanone through selective phenol hydrogenation.

The invention discloses a method for preparing an olefin compound based on a catalyst obtained by compounding carbon tubes and transition metals. The method comprises the following steps: preheating and vaporizing an alkane compound, mixing the compound with carrier gas, and carrying out a dehydrogenation reaction in a reactor under the action of a catalyst; and collecting the olefin compound after condensation, wherein the catalyst contains 5-30wt% of transition metals/transition metal oxides and 70-95wt% of carbon tubes. The method is used for preparing aliphatic olefin compounds and aromatic olefin compounds, the catalyst compounded based on the carbon tubes and transition metal elements/transition metal oxides is stable to water, air and heat, the catalytic activity is invariable after the continuous experiment of over 150 hours, continuous operation can be realized, activation is not needed, and the catalyst is economic and convenient. According to the method disclosed by the invention, when the catalyst is applied to ethylbenzene gaseous phase direct dehydrogenation so as to prepare styrene, the conversion rate of the alkane compound is not less than10 percent, and the selectivity of the olefin compound can be more than or equal to 97 percent.

The present invention relates to a process for manufacturing a part made of a composite having a hollow core (1) comprising the following steps: - applying at least one adhesive layer (6) to an open surface of the hollow core, said process being characterized in that the adhesive layer is a polymerizable blocking adhesive layer having, after polymerization, sealing properties with respect to a resin, and capable of preventing the diffusion of a resin into the hollow core; - and polymerizing the blocking adhesive layer so as to seal the hollow core.

The invention provides a regeneration method for a deactivated transition metal catalyst. The method includes the steps of (1) roasting the deactivated catalyst in an oxygen-containing gas; (2) carrying out purging with a protective gas to replace the oxygen-containing gas; (3) introducing a reducing gas for a reduction reaction to obtain a regenerated catalyst. By adopting the high-temperature solid-phase reaction and controlled reduction strategies, carbon deposition can be eliminated to realize regeneration of the catalyst deactivated by carbon deposition, and meanwhile agglomerated metal nanoparticles can be dispersed again to realize regeneration of the catalyst deactivated by metal sintering. The method is easy and convenient to implement and high in regeneration efficiency, the catalyst can be repeatedly regenerated, the carbon deposition and sintering resistance of the regenerated catalyst is improved, and the service life of the regenerated catalyst is prolonged.

The invention discloses a polyolefin elastomer waterproof roll and a preparation method thereof. The polyolefin elastomer waterproof roll comprises the following components: polyolefin resin and a supported auxiliary agent, wherein the polyolefin resin comprises rubber, polypropylene, a polyolefin elastomer, an initiator and an assistant cross-linking agent; the supported auxiliary agent comprises a carrier and an auxiliary agent, and the auxiliary agent comprises at least one of an antioxidant, an anti-ultraviolet agent, a flame retardant and a pigment. The polyolefin elastomer waterproof roll provided by the invention is stable in performance, has excellent aging resistance, weather resistance, cracking resistance and weldability, is particularly suitable for waterproofing of various roofs, and has a wide market prospect.

The invention discloses a three-layer structure resin matrix composite material and application thereof. An oriented carbon nanotube bundle/epoxy resin composite material (referred to as a layer B) isprepared by a microwave curing method, and a barium titanate nanofiber/epoxy resin composite material (referred to as a layer E) is prepared by a scratch coating-thermocuring method; the B-E-B three-layer structural composite material is formed by a layer-by-layer curing technology. Compared with a conductor/insulation layer/polymer layer type structural composite material in the prior art, the three-layer structure composite material provided by the invention has high dielectric constant (being greater than 1000, @100 Hz), low dielectric loss and high energy storage density, and the preparation process is controllable and feasible, short in production period, and suitable for large-scale application.

A polypropylene film insulation characteristic improving method based on crystal morphology regulation and control comprises the following steps that polypropylene master batch is fully mixed with a nucleating agent by using a double-roller machine to obtain a mixture with the nucleating agent content of 0-0.05% in percentage by mass; the mixture is melted by adopting a press vulcanizer; hot-pressing shaping is conducted on the molten mixture, specifically, the temperature of the press vulcanizer is slowly reduced from 185 DEG C-195 DEG C to 100 DEG C-140 DEG C; and after hot-pressing shaping is completed, a polypropylene/nucleating agent composite film is taken out, and the film is naturally cooled to 25 DEG C in air to obtain the modified polypropylene film. According to the polypropylene film insulation characteristic improving method based on crystal morphology regulation and control, the crystallization process of the polypropylene film can be regulated and controlled, the crystallinity and density of the micron-sized polypropylene film are increased, the microscopic crystal region of the polypropylene film is perfected by improving the microstructure and optimizing the microstructure, carrier migration is limited, the insulation performance of the film is improved, the insulation failure fault is avoided, and reliability of a direct-current transmission system is improved.

The present invention discloses anti-aging yoghurt containing modified starch and a preparation method thereof. The anti-aging yoghurt containing the modified starch comprises the following raw materials in parts by weight: 40-100 parts of bovine colostrum, 10-30 parts of fish collagen peptide powder, 1-5 parts of a thickener, 2-6 parts of concentrated fruit juice, 0.5-1.5 parts of tea polyphenol nanoparticles, 0.1-1 part of a sweetener and 0.1-1 part of probiotics. The thickener is composed of sodium alginate and modified starch according to a mass ratio of 1:(4-6). The anti-aging yoghurt containing the modified starch is rich in nutrients, delicate in mouthfeel, smooth and refreshing, has effects of regulating balance of human body intestinal micro-ecology, improving intestinal functions, lowering blood lipids and lowering blood pressure, enhancing human body immunity and delaying aging, and is simple and easy to implement in the preparation method, strong in operability, low in cost and suitable for factory production applications.

The intention provides a method for directly producing hydrogen by catalyzing methane conversion through microwaves, and the method comprises the following steps of: directly catalyzing methane conversion to generate hydrogen under the action of microwaves by using a composite nano-structure catalyst which is Ni/Mo2C/gamma-Al2O3; the preparation method of the composite nano-structure catalyst comprises the following steps: firstly, loading Mo2C on gamma-Al2O3 by adopting an impregnation method to obtain a composite carrier with one or more layers of Mo2C films flatly laid on the gamma-Al2O3, and then loading an active component Ni on Mo2C/gamma-Al2O3 by adopting a urea precipitation method to obtain the composite nano-structure catalyst. The catalyst can be prepared. The problem of poor activity of the nickel-based supported catalyst under the existing microwave condition is solved. The problems that an existing microwave catalyst is poor in carbon deposition resistance, prone to inactivation, poor in stability and the like are solved to a certain extent.

The invention discloses a method for inhibiting migration of a plasticizer in an esterified starch film and an esterified starch film. The method comprises the following steps: (1) adding starch milk with a certain moisture content into a high-temperature high-pressure reaction kettle, controlling the pH of the system, adding acetic anhydride or propionic anhydride, stirring and reacting for 0.5-4.0 hours at a temperature of 80-100 DEG C, then, adding water to precipitate, filtering and drying to obtain esterified starch; (3) dissolving the esterified starch in acetone to prepare a 40% solution, adding a 20-30% plasticizer, spraying on a polytetrafluoroethylene plate though a fluidized bed at a temperature of 50-55 DEG C with a spraying rate of 1.0-2.8mL/min and atomizing pressure of 0.5-1.5MPa to form a semitransparent film, thereby obtaining the esterified starch film. The method disclosed by the invention can be used for reasonably controlling an aggregation state structure inside the esterified starch film, so that the good in effect in inhibiting the migration of the plasticizer is achieved, the operability is strong and the applied range is wide.

The invention relates to a metal ion-organic acid complex in-situ cross-linked composite membrane as well as preparation and application thereof, and belongs to the field of membrane separation. The preparation method comprises the following steps: anchoring a crosslinking component on the surface of the polymer supporting layer in advance in the form of a metal ion-organic acid complex to form the crosslinking layer, and then carrying out in-situ crosslinking on the polymer on the surface of the crosslinking layer to prepare the polymer selection layer, thereby obtaining the polymer composite membrane. The polymer composite membrane is prepared by preferentially anchoring the crosslinking layer to crosslink the polymer in situ, so that the formation of a thin and compact polymer selection layer is facilitated, and the mass transfer resistance is reduced. When the prepared polymer composite membrane is applied to dehydration of an organic solvent (ethanol), compared with a polymer composite membrane prepared by a traditional cross-linking method, the separation performance is obviously improved.

The invention relates to an amine-containing thioxanthone polyurethane modified epoxy acrylate LED light-cured resin and a preparation method thereof. The LED resin contains three active groups and one amine-containing thioxanthone photo-initiation group; the LED light-cured resin has the following characteristics: 1) energy migration and intermolecular reaction in a polymer chain are easier, and the resin has high self-initiation activity under UV-LED light; 2) the distance between a photoactive group and a main chain is shortened, and the photosensitivity is improved; 3) the system compatibility is excellent; and 4) a tertiary amine co-initiator does not need to be added, the photocuring efficiency is high, and the defects caused by a bimolecular photoinitiation system are overcome. The LED resin prepared by the method has excellent adhesive force, water resistance, aging resistance, chemical resistance and coating odor removal property, also has high wear resistance, high fullness, high tensile strength and excellent flexibility, and is widely applied to UV floor coating, UV wood coating, UV alloy coating, UV circuit board ink, UV plastic coating and the like.

The invention belongs to the technical field of coatings and particularly relates to a high-water-white-resistance acrylic acid water-in-water emulsion and a preparation method thereof. The high-water-white-resistance acrylic acid water-in-water emulsion is prepared from the following substances in parts by weight: 50-80 parts of an acrylate emulsion, 50-70 parts of a silicone acrylate emulsion, 5-12 parts of cellulose, 10-40 parts of an inorganic filler, 5-18 parts of pigments, 5-12 parts of organic silicate ester, 5-12 parts of a silane coupling agent, 1-3 parts of an emulsifying agent, 3-8 parts of an initiator and 50-100 parts of water. By utilizing a reactive emulsifying agent, most emulsifying agent molecules can be bonded to a molecular chain through polymerization reaction, so that a micromolecular existence form of the emulsifying agent is reduced, the desorption, migration and aggregation of the emulsifying agent are avoided, and therefore, the water white resistance of an emulsion coating film is improved.