65results about How to "Avoid gel phenomenon" patented technology

The invention discloses a dispensing device, comprising a framework, a container and a needle nozzle arranged from top to bottom in sequence. An elevating rod and a cam are installed in a cavity of the framework; a roller wheel at the top of the elevating rod contacts the cam tightly; the elevating rod stretches from the framework and is connected with the container; two hollow rods are arranged in the container; the two hollow rods are respectively sheathed with buffer springs and penetrate the bottom and a cover plate of the container; the two hollow rods are provided with connecting pipes at the bottom, pressure holes on the top covers and glue inlet holes on the sides; each hollow rod is internally provided with a piston and a glue inlet valve; the glue inlet valve is provided with a glue inlet opening and a glue channel; the glue channels of the two glue inlet valves are connected and the connecting pipe is connected with a mixing pipe communicated with the glue channel; the mixing pipe is provided with a mixed glue blade and is connected with the needle nozzle at the bottom end; the outside wall of the framework is fixed with a sensing surface of a displacement sensor; a probe of the displacement sensor is fixed on a support connected with the hollow rod. The dispensing device can carry out dispensing precisely; thereby can not only effectively avoid glue leakage and glue coagulation but also avoid damage of the needle nozzle.

The invention relates to a preparation method of a free nitroxide radical polymer brush polymerization inhibitor, and application of the free nitroxide radical polymer brush polymerization inhibitor in synthesis of epoxy soybean oil acrylic ester. The preparation method comprises the following steps: firstly, grafting a polyglycidyl methacrylate polymer brush on the surfaces of cross-linked polystyrene microspheres by using an electron transfer regenerated catalyst atom transfer free radical polymerization technique, and secondly, bonding tetramethyl piperidine free nitroxide radical onto the polyglycidyl methacrylate polymer brush, thereby obtaining the free nitroxide radical polymer brush. The application comprises: taking the free nitroxide radical polymer brush as a main polymerization inhibitor and a small molecule polymerization inhibitor as a polymerization inhibitor aid, thereby forming a composite polymerization inhibition system for preparing epoxy soybean oil acrylic ester. The composite polymerization inhibition system not only has a high-efficiency polymerization inhibition function in the epoxy soybean oil acrylic ester preparation, but also is easy in recycling the main polymerization inhibitor, namely the free nitroxide radical polymer brush, so that the free nitroxide radical polymer brush can be recycled, and a product can be prevented from self-polymerization when being preserved when a small amount of the polymerization inhibitor is retained in the system.

The invention relates to a method for grafting maleic anhydride by ethylene propylene diene monomers. The method is characterized in that the ethylene propylene diene monomers are taken as raw materials, maleic anhydride is taken as a grafting monomer, a plasticizer, a reinforcing agent and a vulcanization retarder are added, the obtained mixture is evenly mixed and then put into an extruder to be fused and blended so as to granulate and obtain the graft of ethylene propylene diene monomers and maleic anhydride, i.e., EPDM-g-MAH; before the fusion and extrusion of the mixture, high-energy rayradiation is carried out to the mixture by a radiant point; and during granulation, the length-diameter ratio of the screw of the extruder is 15 to 33:1, the rotation speed of the extruder is 30 r / min to 180 r / min and the temperature of the die orifice of the extruder is 60 DEG C to 180 DEG C. The method does not cause the ethylene propylene diene monomers (EPDM) to gel, which is conducive to thecompatibility of the ethylene propylene diene monomer with a polar polymer (engineering plastics); the grafting rate of the grafting product is high and can reach up to 1.2 percent to 3.6 percent; and radiation grafting adopted does not pollute the environment, saves energy and reduces production cost by about 30 percent.

The invention relates to a regulation and control method for a preparation process for a bio-oil starch adhesive for wood, and belongs to the technical field of adhesives. The regulation and control method comprises the following steps: adding ammonium persulphate in an emulsion obtained by mixing starch and hydrochloric acid to obtain an acid-hydrolyzed and oxidized starch emulsion; adding polyvinyl alcohol, adjusting the pH value by sodium hydroxide solution, adding grafting monomer acrylamide, and then adding ammonium persulphate to obtain a composite modified starch emulsion; adding bio-oil to obtain an initial bio-oil starch adhesive; and repeatedly adjusting the pH value by the sodium hydroxide solution and the bio-oil to obtain the bio-oil starch adhesive. The method is simple and convenient, accurate, moderate in reaction, simple in parameters, high in process stability, capable of reducing the gel problems and reaction insufficiency phenomena of the starch adhesive, guaranteeing a reaction sufficiency degree and improving the performances of the bio-oil starch adhesive, and suitable for industrial mass production; the prepared adhesive is excellent in performance, and capable of meeting the application requirements thereof in the field of wood.

The invention discloses a preparation method and application of a nano silicon dioxide modified soap-free fluorine-free cationic polyacrylate waterproof agent. In the preparation process of a fluorine-free long-chain polyacrylate waterproof agent, a reactive quaternary ammonium salt cationic emulsifier and a reactive nonionic emulsifier are utilized for synergistic emulsification and participate in a polymerization reaction; emulsifier molecules, long-chain acrylate, short-chain alkyl acrylate monomers and cross-linking monomers are copolymerized and bonded into waterproof emulsion macromolecular chains, and meanwhile, nano SiO2 particles are introduced into the macromolecular chains under the in-situ hydrolysis effect of an organic silicon reagent and the coupling effect of a silane coupling agent, therefore, the soap-free fluorine-free polyacrylate waterproof emulsion which is high in solid content, small in particle size and uniform and stable in distribution and can endow textiles with excellent waterproofness, durability and antibacterial property is developed.

The invention belongs to the technical field of hard material polishing, and concretely relates to a preparation method of a large-particle-size low-viscosity silica solution for polishing sapphire. The method comprises the following steps of (1) preparing a sodium hydroxide solution; (2) preparing activated silica powder; (3) preparing a dibenzofuran solution; (4) in water, adding glycerol, then slowly adding the activated silica powder and the dibenzofuran solution, and meanwhile, dropwise adding the sodium hydroxide solution; (5) after feeding the materials, continuously reacting, performing vacuum suction filtration after natural cooling, and obtaining the large-particle-size low-viscosity silica solution. The silica solution obtained through the invention has large grain size, the grinding effect of the silica solution on the sapphire can be remarkably improved, the polishing efficiency is improved, the silica solution is low in viscosity and difficult to agglomerate, the surface damage and the roughness of the sapphire are reduced, and the surface quality of the sapphire is ensured.

An environment-friendly refractory foam material and a preparation method thereof. The invention relates to a novel foam material capable of being used for energy-saving buildings and preparation thereof. The foam material includes: a sodium silicate component, a polyurethane component, and regular assistant materials and additives. The sodium silicate component (A) includes more than 60% of sodium silicate and also contains more than 0.5% of a catalyst and / or a co-catalyst so that in a normal-temperature foaming reaction, surface dry can be achieved within 10 min. The double components also contain more than 10% of a polyol or a polyol derivative. The polyurethane component (B) is a polyurethane prepolymer or is a combination of the polyurethane with a proper amount of polyisocyanate and / or an organic solvent and / or a plasticizer, wherein the polyurethane prepolymer is formed through a reaction of polyester polyol and / or polyether polyol and polyisocyanate, NCO content being 8-25% or8-13%. The weight ratio of component A to the component B is 1:1-1.5. The foam material is environment-friendly and refractory and has excellent heat insulation effect, is low in smoke density and toxicity, has good dimensional stability, has both rigidity and flexibility, and is low in manufacturing cost.

The invention discloses a method for preparing polyester staple fibers by using a waste polyester raw material. The method comprises the following steps of: cleaning and drying waste polyester, and performing compression aggregation and granulation; drying, conveying into a reaction type vented screw extruder, and adding phenyl bis-oxazoline and N, N'-carbonyl bis-caprolactam polyester chain extenders which are 0.5 to 3 mass percent of granules; conveying the polyester granules and the chain extenders to the reaction type vented screw extruder together, melting and mixing; and weighing a melt and conveying to a spinning unit to prepare the polyester staple fibers. The degradation of the waste polyester in the processing and using processes can be improved, the molecular weight of the waste polyester is improved, and the processing efficiency and fiber quality of the polyester fibers are improved. The prepared polyester fibers can be used for filling materials of clothing and furniture fabrics, geotextiles, roofing felt base cloth, nonwoven fabrics of insulating materials, shoe covers, wiping cloth and several disposable nonwoven products.

Disclosed is a method for recycling silicon cutting waste mortar. The method comprises the steps of performing solid-liquid separation of the waste mortar; performing solid flow washing and vacuum filtration; drying the obtained filter cake, mixing with deionized water and performing activation reaction; adding water glass and sodium hydroxide successively and performing heating reaction, performing solid-liquid separation of the obtained product, performing ion exchange resin decolorization and distillation of the liquid phase to obtain silica sol, and performing solid phase washing and drying to obtain a silicon carbide raw material; and performing ultra precision filter of obtained liquid phase after solid-liquid separation of the waste mortar, adding a decoloring agent a filter aid to perform solid-liquid separation, reducing the conductivity, and heating and evaporating water to obtain finished polyethylene glycol cutting liquid. According to the technical scheme of the method, the flow line production is achieved, the silicon cutting waste mortar is recycled, the silica sol is prepared effectively, and the environmental pollution is reduced.

The invention relates to a preparation method of a nitroxide free radical polymer brush inhibitor and its application in the synthesis of epoxy soybean oil acrylate. The preparation method is to first adopt electron transfer regeneration catalyst atom transfer radical polymerization technology on the surface of cross-linked polystyrene microspheres, graft polyglycidyl methacrylate polymer brushes; Bonded thereon, a nitroxide radical polymer brush is obtained. Said application is to use nitroxide free radical polymer brush as the main polymerization inhibitor, and the small molecular polymerization inhibitor as auxiliary polymerization inhibitor to form a composite polymerization inhibition system to prepare epoxy soybean oil acrylate. The composite inhibitory system can not only have high-efficiency polymerization inhibitory effect in the preparation of epoxy soybean oil acrylate, but also is easy to recycle the main inhibitory agent nitroxide free radical polymer brush, so that it can be recycled, and a small amount of auxiliary inhibitory agent remains In the system, it can also prevent the self-aggregation of the product during storage.

The invention discloses a preparation method and application of water-soluble solid styrene-acrylic resin. The preparation method comprises the following steps of: introducing supercritical fluid into a stirring reaction kettle as a reaction medium; adding a styrene monomer, an acrylic monomer, an initiator and a chain transfer agent to carry out radical polymerization reaction; and removing the volatile components and the supercritical fluid from a reaction product through exhausting and pressure reduction, thus the pure water-soluble solid styrene-acrylic resin is prepared, wherein the reaction temperature is equal to or higher than the critical temperature of a polymerization medium, the pressure is equal to or higher than the critical pressure of the polymerization medium, the critical temperature is 31.1 DEG C, and the critical pressure is 7.38MPa. The water-soluble solid styrene-acrylic resin prepared by the method avoids the condensation in the conventional preparation of the solid styrene-acrylic resin, obtains a polymer with narrower molecular weight distribution by adding the chain transfer agent alpha-methyl styrene dimmer and has good pigment wetting dispersity.

The invention provides a polyurethane resin. The raw materials for preparing the polyurethane resin mainly consist of the following components in parts by weight: polyol: 150-200 parts; chain extender: 10-45 parts; isocyanate: 100-150 parts; Oxygen agent: 0.1-10 parts; Reaction terminator: 0.1-1 part; Solvent: 500-800 parts; Reactivity modifier; The content of each component of the polyol: polytetrahydrofuran ether glycol: 40- 70%; Polyester polyol: 0-45%; Polycarbonate diol: 0-15%; Polycaprolactone diol: 0-25%; Modified dimethicone diol : 5-10%. The invention also provides the preparation method and application of the resin. The polyurethane resin prepared by the invention can form small and uniform cells when processing the superfine fiber synthetic leather, so that the produced superfiber can have finer creases and full fleshy feeling.

The invention discloses a preparation method of silicone rubber coloring master batch, including the following steps: (1) weighting the following raw materials respectively according to a formula: 60-80 parts of silicone rubber, 35-45 parts of reinforcing agent, 0.1-3 parts of structure controlling agent, 65-75 parts of coloring agent and 0.5-4 parts of age resister; (2) putting the weighted raw materials into an open mixing machine for mixing in a sequence of tapered weight parts, encapsulating a front roller first and then encapsulating a rear roller under the conditions that a roller spacing is 5-6mm, the temperature of the front roller is set to be 30-34 DEG C, the temperature of the rear roller is set to be 25-30 DEG C, and the mixing time is 12-18min; and (3) intensively mixing on an open mill, repeating overturn milling for 3-5 times, cooling to room temperature, cutting the materials into blocks and then packaging. The silicone rubber coloring master batch prepared according to the invention has the advantages of good dispersity, high cleanliness in the using process of downstream manufacturers and prolonged service life of products.