66results about How to "Prevent riots" patented technology

The invention relates to a preparation method of a fiber with high water absorption, which is a method for preparing the fiber with high water absorption by a post-crosslinking agent. According to the preparation method, the fiber with high water absorption is prepared from acrylic acid (AA) and acrylamide (AM) which are partly neutralized and taken as polymerized monomers through the steps of: blending the polymerized monomers with polyving akohol (PVA), initiating by potassium persulfate (KPS), blending and polymerizing in an aqueous solution, adding a dialdehyde solution to obtain a mixed solution serving as a post-crosslinking agent solution, mixing to be uniform and defoaming to obtain a spinning stock solution; dry-wet spinning the spinning stock solution to form a nascent fiber; and heat-treating the nascent fiber at a certain temperature to generate a crosslinking reaction, thereby forming the three-dimensional net-structured fiber with high water absorption. According to the preparation method, the implosion phenomenon which easily occurs during polymerization of the traditional polymer solution with high water absorption is avoided, the preparation technology is simple and safe, the production cost is reduced, and the production efficiency is increased; and the obtained water-absorbing fiber has high and controllable water adsorption, thermostability, capability of being repeatedly used, and long residual action.

The invention discloses an electrolyte-resistant pigment printing thickener, belongs to the technical field of textile dyeing and printing auxiliaries, and aims to solve the problem of poor electrolyte resistance and thickening effect coordination of the conventional printing acrylic acid synthetic thickener. The electrolyte-resistant pigment printing thickener is obtained by neutralizing an acrylic acid monomer with a pH conditioner, adding an initiator ammonium persulfate and a crosslinking agent to prepare an aqueous phase, carrying out pre-emulsification the aqueous phase and an oil phase prepared from an oil-phase solvent, an initiator, an emulsifier and a comonomer, further performing complete emulsification under the action of an initiator sodium bisulfite, finally adding a reversed-phase emulsifier for complete reversed-phase emulsification and performing discharging and drying. The prepared electrolyte-resistant pigment printing thickener has high thickening performance and electrolyte resistance, and is simple in preparation process and easy to be industrially produced.

The invention discloses a method for preparing a polycarboxylate water reducing agent by a normal-temperature mixing process. A polyether macromonomer, a redox, acrylic acid, an unsaturated third monomer, a chain transfer agent and water are mixed once at normal temperature to prepare the polycarboxylate water reducing agent. The method disclosed by the invention adopts a one-time mixing mode; in a synthesis process, a pump circulation device only runs in a pre-dissolving macromonomer, and the device is closed after the pre-dissolved reducing agent component is fed. The traditional production method adopts an elevated tank dropping mode to produce the polycarboxylate water reducing agent, and the production is performed in a reaction kettle, so that the equipment cost input is relatively high. In the method disclosed by the invention, a one-time mixing process is adopted creatively, and the method is performed in a normal-temperature way without needing a heat source, so that the production period is short, the energy consumption is low, and the synthesis process does not need a stirring device, a professional for monitoring and an enamel reaction kettle device; the concrete performance of the synthesized polycarboxylate water reducing agent is equivalent to that of the water reducing agent synthesized by the traditional process, a favorable reference basis is provided for workshop-style water reducing agent production, and the polycarboxylate water reducing agent has obvious advantages.

The invention relates to a preparation method of an acrylic resin used in the paint and printing ink industry, in particular to a preparation method of a solid acrylic resin. Add hard monomers, soft monomers, functional monomers, initiators, chain transfer agents and auxiliary components into the reactor for polymerization; when the total conversion rate of the above-mentioned monomers in the reactor is 40-50% When starting to drop the diluted solvent into the reactor gradually to reduce the viscosity until the total conversion rate of the above-mentioned monomers reaches 70-80%, the resulting dilution is discharged from the reactor into the storage tank; then The dilution is continuously poured into the tubular reactor from the storage tank to carry out the polymerization reaction; the reaction product enters the devolatilization tower after coming out of the tubular reactor, and the solid acrylic resin after removing the diluted solvent is discharged from the devolatilization tower. The lower portion was discharged to obtain a solid acrylic resin. The invention overcomes the disadvantages that bulk polymerization is easy to produce detonation phenomenon and the polymerization temperature is difficult to control, and improves the utilization efficiency of equipment.