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4976 results about "Polymer solution" patented technology

Polymer solutions are solutions containing dissolved polymers. These may be liquid solutions (e.g. in aqueous solution), or solid solutions (e.g. a substance which has been plasticized). The introduction into the polymer of small amounts of a solvent (plasticizer) reduces the temperature of glass transition, the yield temperature, and the viscosity of a melt. An understanding of the thermodynamics of a polymer solution is critical to prediction of its behavior in manufacturing processes — for example, its shrinkage or expansion in injection molding processes, or whether pigments and solvents will mix evenly with a polymer in the manufacture of paints and coatings.

Electrospinning nano-fiber electret filtering material and its preparation method

ActiveCN104289042AHigh surface electrostatic potentialHigh super strong electrostatic adsorption performanceSynthetic resin layered productsFiltration separationPorosityFiber
The invention relates to an electrospinning nano-fiber electret filtering material and its preparation method. The high-efficiency and low-resistsance nano-fiber electret filtering material having no interfibrous adhesion and having a fluffy three-dimensional netted intercommunication structure is prepared through controlling the component and the temperatures of a polymer solution in an electrospinning process and carrying out one-step forming in the nano-fiber forming rapid cooling process, wherein the gram weight of the above nanofiber layer is 0.01-70g/m<2>, and the porosity is not less than 80%. The surface electrostatic potential of the nano-fiber electret filtering material is 800-6000V, and the surface charges have lasting storage stability, the hydrophobic angle is greater than 150DEG, the filtering efficiency of the material to particles of 0.006-1[mu]m can reach above 99.999%, the piezoresistance is less than 20Pa, and the dust containing capacity is 300-3600g/m<2>. The preparation method is simple, and the filtering material has wide application prospects in the fields of individual protection mouth mask filtration, indoor air purification and filtration, and high efficiency/ultrahigh efficiency air filtration.
Owner:DONGHUA UNIV

Temperature-resistant salt-resistant efficient gel, and preparation and use thereof

The invention discloses a temperature resistant salt tolerant high efficiency gel and a preparation method and application thereof. The preparation method is characterized in that the preparation method comprises the following steps: preparing a comb-shaped associated copolymer PAH containing macromonomers and functional hydrophobic monomers into an aqueous solution having the concentration of 0.1 to 4g/L, the crosslinking agent concentration of 0.01 to 1.0g/L, the surfactant concentration of 0.01 to 8mmol/L and the sodium sulfite thermal stabilizer concentration of 0.005 to 1.0g/L; adding the aqueous solution into a mixing container with a stirring device; stirring the aqueous solution evenly at the room temperature; regulating the pH value of the solution to be equal to between 4 and 11, and obtaining a temperature resistant salt tolerant high efficiency gel polymer solution system used for tertiary oil recovery and scavenge, displacement modification, profile modification or water shutoff. The polymer solution system has micro-crosslinking to form the gel during the flowage inside the oil reservoir. The gel has good elasticity, not easy dehydration, stable gelling performance, and excellent tackification, temperature resistance, salt tolerance, shearing resistance and ageing resistance.
Owner:CHENGDU UNIVERSITY OF TECHNOLOGY

Umbrella-shaped electrostatic spinning sprayer and electrostatic spinning method

The invention relates to an umbrella-shaped electrostatic spinning sprayer and an electrostatic spinning method. The sprayer comprises an umbrella-shaped spinning nozzle, a numerical control type infusion device and a solution collecting groove, wherein the numerical control type infusion device mainly comprises a solution propeller and a controller; the middle of the umbrella-shaped spinning nozzle is provided with a cylindrical hollow portion, and an output end of the solution propeller is placed into the cylindrical hollow portion of the umbrella-shaped spinning nozzle; the controller controls flow velocity and flow of spinning solutions; and the solution collecting groove is placed in the bottom of the umbrella-shaped spinning nozzle. The electrostatic spinning method comprises that a binding post on the umbrella-shaped spinning nozzle is connected with a high-voltage positive electrode, conducting polymer solutions are continuously added to the umbrella-shaped spinning nozzle which is horizontally placed through the numerical control type infusion device, electrostatic spinning is started, collection is achieved through a collecting device, and nano-fibers are formed. The sprayer avoids blocking phenomena, and is easy to clean and good in stability; and the electrostatic spinning method improves production efficiency and the yield of electrostatic spinning.
Owner:DONGHUA UNIV

Method for preparing nano cellulose microfibril reinforced polymer composite material

The invention discloses a method for in situ generating a nano cellulose microfibril reinforced polymer composite material, comprising the following steps: using ionic liquid as a primary solvent, dissolving cellulose, or mixing cellulose with other polymers via solution mixing, and controlling the solubility of the cellulosic material in the solvent to maintain naturally occurring nano cellulose microfibril in the cellulosic material, so as to in situ obtain the nano cellulose microfibril reinforced polymer composite material. The nano microfibril can be observed under a transmission microscope obviously, which is different from the completely dissolved cellulose solution. In the preparing process, the dissolving temperature is controlled within 30-150 DEG C, and stirring and vacuum deaeration are used as auxiliary. By controlling the dissolving time, solution concentration and ratio of mixing, a polymer solution containing cellulose microfibril with dimension of 5-300 nanometers can be obtained. The polymer solution can be used for preparing composite material fiber, hollow fibrous membrane, diaphragm, film, gel, porous material and other known applications of enhanced material.
Owner:INST OF CHEM CHINESE ACAD OF SCI
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