8results about How to "Prevent gel" patented technology

The invention relates to a flexible and high-strength composite piezoelectric fiber film as well as a preparation method and application thereof, and the preparation method comprises the following steps: dissolving PVDF (Polyvinylidene Fluoride) or a copolymer thereof in a solvent to obtain a first solution; dissolving a strong dipole moment asymmetric polar inorganic metal salt in a solvent to obtain a second solution; uniformly mixing the first solution and the second solution, adding the multifunctional bio-based polymer, performing ultrasonic stirring until a uniform composite spinning solution is formed, and performing electrostatic spinning to obtain the composite piezoelectric fiber film. The fiber film provided by the invention integrates the mechanical strength and chemical stability of PVDF and copolymer thereof and the flexibility and water absorption of bio-based polymer. Meanwhile, inorganic metal salt is introduced to play a role of a beta-phase nucleating agent in the electrostatic spinning PVDF crystallization process, the piezoelectric output performance of the electrostatic spinning PVDF nano piezoelectric composite film is enhanced, and the mechanical performance of the fiber film is improved through the metal coordination effect of metal ions and hydroxyl or carboxyl on the bio-based polymer; the application potential in the fields of sensors, battery diaphragms, antibacterial coatings and the like is expanded.

The utility model discloses a paint spraying equipment with steering structure belongs to paint spraying equipment technical field, it includes the shell and the controller of fixed connection in the shell outside, the transmission assembly is installed to the shell inner wall downside, two uprights are fixedly connected with the transmission assembly upside, two fixedly connected with cross column between uprights, two uprights one side all are fixedly connected with the sliding slot, the hydraulic cylinder is fixedly connected with the sliding slot upside, and the sliding slot between two is slid through and is provided with the rack, and the spring is fixedly connected between the rack and the sliding slot, the sliding frame is slidingly connected on the cross column, the worm wheel is rotatably connected with the sliding frame one side, and the worm is rotatably connected with the cross column upside. The utility model the utility model is engaged through the engagement of worm wheel and worm, and the engagement and separation of rack and worm wheel, still have the setting of three direction steering subassembly, make the spray gun can complete to any angle's spray coating, solve the problem of dead angle, improve the spray coating technology and production efficiency of product.

The present invention addresses the problem of providing a technique for easily preparing a heated food with a succulent texture while minimizing water loss due to heating. The method for producing a heated food of the present invention includes pretreating a food precursor susceptible to water exudation on heating by applying a composition containing a monovalent metal salt of alginic acid and a slightly water-soluble divalent metal salt to the food precursor and heating the pretreated food precursor. The method includes performing a gelling prevention measure to prevent the alginic acid in the composition from gelling after the pretreatment and before the heating. The gelling prevention measure includes controlling (1) the temperature of the food precursor immediately before applying the composition in the pretreatment at or below 30°C, (2) the time in which the temperature of the pretreated food precursor is 40°C or higher less than 2 hours, and (3) the time in which the temperature of the pretreated food precursor is in the range of from 10°C to 20°C less than 12 hours.

The invention relates to the technical field of polymer composite materials, in particular to air-drying styrene-free vinyl ester resin and a preparation method thereof. Comprising the following steps: S1, adding epoxy resin, methacrylic acid and a polymerization inhibitor into a reaction kettle, stirring, raising the temperature for the first time, adding a catalyst in batches, raising the temperature for the second time after adding, keeping the temperature, and continuing the reaction until the reaction is finished; s2, adding binary anhydride, and carrying out heat-preservation reaction until the reaction is finished; s3, adding allyl ether until the reaction is finished; and S4, adding the reactant into the acrylate monomer, continuously stirring until the mixture is uniformly mixed, and finally cooling to 35 DEG C or below to obtain the product. According to the invention, dicarboxylic anhydride reacts with hydroxyl on a vinyl resin chain under a low temperature condition to introduce carboxyl, and an air-drying group allyl ether is introduced under a mild condition, so that the air-drying property of the resin is improved, reactants are prevented from gelling due to high temperature, the reaction process is simple and easy to control, and the preparation method is suitable for industrial production. The air-drying styrene-free vinyl resin with good comprehensive performance is obtained.

The invention discloses a bio-based coating capable of being electrodeposited, the coating comprises cashew novolac urea-based resin or cashew novolac amide modified epoxy resin, and the emulsion stability is improved by accurately controlling the amine value. The preparation method comprises the following steps: 1) synthesizing a cardanol aldehyde amine curing agent; 2) preparing cashew phenolic amide resin and cashew phenolic urea-based resin; 3) introducing an amino structure, and preparing epoxy resin containing a water-soluble group through a ring-opening reaction and a chain extension reaction; 4) neutralizing amido through a neutralizing agent to form a water-soluble cationic resin emulsion; and 5) adding a cross-linking agent, a cosolvent and a high-boiling-point solvent to form a stable coating emulsion. The invention relates to an electrodepositable coating which is prepared by a green chemical process on the basis of a bio-based material. The coating comprises a method for modifying epoxy resin with cardanol aldehyde urea-based resin or cardanol aldehyde amide, and the emulsion stability is improved by accurately controlling the amine value.

This invention provides a method for the synergistic separation of rubidium and cesium and the removal of silicon and aluminum from lithium slag. The method comprises the following steps: mixing lithium slag with an organic acid and performing a leaching reaction; after solid-liquid separation, obtaining a leachate and a leaching residue; applying an external field to the leachate to induce silicic acid condensation in the leachate to form silica gel; after solid-liquid separation, obtaining a desiliconized leachate and silica gel; mixing the desiliconized leachate with a complex-breaking agent and performing a complex-breaking treatment; then adding a precipitant to the solution after the complex-breaking treatment to precipitate aluminum ions; after solid-liquid separation, obtaining a rubidium-cesium leachate and an aluminum-containing precipitate; mixing the rubidium-cesium leachate with an extractant and performing rubidium-cesium extraction to separate a rubidium-cesium-rich organic phase and an aqueous phase. Furthermore, the method of this invention is simple, the reaction conditions are mild, it conforms to the concept of green chemical development, and it has good prospects for industrial application.

This invention discloses a method for manufacturing an ionic liquid-functionalized poly(3,4-ethylenedioxythiophene):poly(styrenesulfonic acid) thin film with adjustable work function, comprising: a pretreatment step, in which methanol is added to a poly(3,4-ethylenedioxythiophene):poly(styrenesulfonic acid) solution to obtain a pretreatment liquid; a film forming step, in which the pretreatment solution is coated onto a substrate using a doctor blade to obtain a first-stage thin film; a film treatment step, in which DMSO is coated onto the first-stage thin film using a doctor blade and then the DMSO is washed away to obtain a second-stage thin film; and an ionic liquid treatment step, in which an aqueous solution of an ionic liquid is coated onto the second-stage thin film using a doctor blade and then the ionic solution is washed away to obtain an ionic liquid-functionalized poly(3,4-ethylenedioxythiophene):poly(styrenesulfonic acid) thin film, which not only has good mechanical stability, but also good conductivity and can achieve a changeable work function by using different ionic liquids.

The invention discloses a preparation method of salt-heat double-tolerant whey protein, which comprises the following steps: dispersing whey protein in water to obtain a solution A; the mass concentration of the protein in the solution A is 1-5%, and the pH is 7-9; performing ultrahigh pressure treatment on the solution A to obtain a solution B; the pressure of the ultrahigh pressure treatment is 300 to 600 MPa, and the time is 5 to 10 minutes; adjusting the pH value of the solution B to 4-5 to obtain a solution C; centrifuging the solution C, and recovering the precipitate; dispersing the precipitate in water, and adjusting the pH value to 6.0-7.0 to obtain a solution D; and drying the solution D to obtain the salt-heat double-tolerant whey protein. After being heated in a system containing NaCl or CaCl2, the salt-heat double-tolerant whey protein dispersion liquid (5%, w / w) still has good flowability. The salt-heat double-tolerant whey protein prepared by the invention can be used for preparing protein beverages or smokable gel rich in electrolyte.