摘要:
The present invention relates to a preparation method of a superabsorbent polymer, and specifically to a method of preparing a superabsorbent polymer including the steps of: preparing a hydrous gel phase polymer by thermal polymerizing or photo-polymerizing a monomer composition including a water-soluble ethylene-based unsaturated monomer and a polymerization initiator; drying the hydrous gel phase polymer; milling the dried polymer; classifying the milled hydrous gel phase polymer into two or more grades by particle size; adding a surface cross-linking agent to each hydrous gel phase polymer classified into two or more grades; and carrying out a surface cross-linking reaction of the hydrous gel phase polymer to which the surface cross-linking agent is added.
摘要:
The present invention provides a polymerization reactor for producing a super absorbent polymer comprising: a reaction unit; a monomer composition supply unit being connected to the reaction unit and supplying a monomer composition solution containing a monomer, a photoinitiator, and a solvent; an agitating shaft extended in the reaction unit from one end of the reaction unit connected to the monomer composition supply unit to the other end of the reaction unit; a plurality of agitating blades installed around the agitating shaft; and a light irradiation unit providing light to the monomer composition solution furnished from the monomer composition supply unit, and a method of producing super absorbent polymers by using the same.
摘要:
The present invention relates to a method of preparing a superabsorbent polymer, including the steps of: preparing a hydrous gel phase polymer by thermal polymerizing or photo-polymerizing a monomer composition including a water-soluble ethylene-based unsaturated monomer and a polymerization initiator; drying the hydrous gel phase polymer; milling the dried polymer; adding a surface cross-linking agent to the milled polymer; and elevating the temperature of the polymer including the surface cross-linking agent at a speed of 3° C./min to 15° C./min, and carrying out a surface cross-linking reaction at 100° C. to 250° C.
摘要:
A method of defining three-dimensional structure from mask layout for computer simulation, which provides a technology for defining a three-dimensional structure of liquid crystal cell which comprises a apparatus of liquid crystal display for designing and analyzing a apparatus of liquid crystal display.A method of generating three-dimensional structure which comprised of material layers between upper substrate and lower substrate, which provides a generation method of three-dimensional structure for computer simulation by depositing material layers under the upper substrate and over the lower substrate, and sandwiching a center insertion layer between the deposited upper and lower material layers for a case which includes tapered structure of material layer for the substrate.
摘要:
The present invention relates to a preparation method of a superabsorbent polymer, and specifically to a method of preparing a superabsorbent polymer including the steps of: preparing a hydrous gel phase polymer by thermal polymerizing or photo-polymerizing a monomer composition including a water-soluble ethylene-based unsaturated monomer and a polymerization initiator; drying the hydrous gel phase polymer; milling the dried polymer; classifying the milled hydrous gel phase polymer into two or more grades by particle size; adding a surface cross-linking agent to each hydrous gel phase polymer classified into two or more grades; and carrying out a surface cross-linking reaction of the hydrous gel phase polymer to which the surface cross-linking agent is added.
摘要:
The present invention provides a polymerization reactor for producing a super absorbent polymer comprising: a reaction unit; a monomer composition supply unit being connected to the reaction unit and supplying a monomer composition solution containing a monomer, a photoinitiator, and a solvent; an agitating shaft extended in the reaction unit from one end of the reaction unit connected to the monomer composition supply unit to the other end of the reaction unit; a plurality of agitating blades installed around the agitating shaft; and a light irradiation unit providing light to the monomer composition solution furnished from the monomer composition supply unit, and a method of producing super absorbent polymers by using the same.
摘要:
The present invention relates to a process for preparing super absorbent polymers, and more specifically to a process for preparing super absorbent polymers comprising the steps of: forming a monomer composition comprising water-soluble, ethylenic unsaturated monomers and non-reactive fine particles having a diameter of 20 nm to 1 mm; and subjecting the monomer composition to a thermal polymerization or a UV-induced polymerization.In the present invention, introducing fine particles into the monomer composition can provide paths for effectively discharging moisture or heat from the super absorbent polymers during or after a polymerization, thereby making it possible to obtain high quality super absorbent polymers showing a low water content and a low temperature and thus having excellent properties and enabling one to expect an energy-saving effect in a drying process.
摘要:
A method for fabricating a gate-to-drain overlapped MOS transistor in which gate-to-drain capacitance is lower and a structure thereby. A pad oxide layer is formed over a substrate having a first conductive layer with a first pattern formed on a first gate oxide layer, and etchback process is performed until surface part and a predetermined upper parts of the both side walls of the first conductive layer is exposed. As a result, a second conductive layers with a second pattern is formed and a second gate oxide layer thicker than the first gate oxide layer is formed.
摘要:
The present invention relates to a method of preparing a super absorbent polymer (SAP), and more specifically to a method of preparing a SAP including the steps of spraying the monomer composition on a substrate having a hydrophobic surface of a certain tan angle and carrying out a UV polymerization on a polymerization reactor having a slightly hydrophilic surface. The present invention can improve the conversion rate of polymerization because the shape of the monomer solution is changed from prior sheet form to droplet form so that UV rays reach the deeper layer of the droplets, can minimize or simplify the recycling process because it is easy to control the particles of the prepared polymer, and can provides the SAP of high caliber by narrowing the particle diameter distribution and improving the uniformity.
摘要:
A shredder for super absorbent polymer includes an inlet portion for feeding a plate-shaped super absorbent polymer, a pulverizing portion for pulverizing the super absorbent polymer fed through the inlet portion, and an outlet portion for discharging the pulverized super absorbent polymer from the pulverizing portion. The pulverizing portion includes a rotary drum to which a plurality of rotary blades are attached, at least one fixed blade for pulverizing the super absorbent polymer in cooperation with the plural rotary blades, and a housing for holding the rotary drum and the at least one fixed blade. Each rotary blade has a polygon shape with at least one vertex having an acute angle of at most 45°.