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150results about How to "High grafting rate" patented technology

Method for preparing super absorbent resin by graft copolymerization reaction of carboxymethyl potato starch, acrylamide, acrylic acid and sodium salt thereof

The invention discloses a method for preparing super absorbent resin by the graft copolymerization reaction of carboxymethyl potato starch, acrylamide, acrylic acid and sodium salt thereof, which comprises the following main processes: carrying out neutralization reaction between a sodium hydroxide solution and acrylic acid from which polymerization inhibitor is removed under the cooling of ice-water bath; mixing acrylamide with de-ionized water to obtain an acrylamide solution; mixing the carboxymethyl potato starch with the prepared acrylic acid and the sodium salt solution and the acrylamide solution; adding an evocating agent persulfate and a cross-linking agent N,N'- methylene-bisacrylamide; stirring the mixture under room temperature; heating the mixture by water bath to rise the temperature so as to ensure that the carboxymethyl potato starch, the acrylic acid and the sodium salt thereof and the acrylamide generate graft copolymerization reaction under the protection of nitrogen; keeping the temperature of the reaction; drying and crashing to obtain the super absorbent resin with high potassium content by using carboxymethyl potato starch as the raw material. Compared with the similar products, the water absorption of the super absorbent resin is greatly enhanced; the super absorbent resin contains nitrogen nutrition element, does not need pasting in comparison with theprocess of directly using starch and greatly improves the preparation process. The super absorbent resin has great effect on the water conservation, the desert control, the plant growth promotion andthe like of soil in dry regions.
Owner:内蒙古永业生物技术有限责任公司

Low temperature impact resistant nylon flexibilizer and preparation method of low temperature impact resistant nylon flexibilizer

The invention relates to a low temperature impact resistant nylon flexibilizer and a preparation method of the low temperature impact resistant nylon flexibilizer. The low temperature impact resistant nylon flexibilizer comprises the following components in parts by weight: 50-95 parts of ethylene-alpha-octylene copolymer resin, 4-40 parts of polypropylene copolymer, 1-30 parts of linear low density polyethylene, 0.5-10 parts of graft monomer, 0.01-2 parts of initiator, 0.1-1 part of lubricator, 0.1-1 part of antioxidant and 0.1-2 parts of liquid additive. The preparation method of the low temperature impact resistant nylon flexibilizer comprises the steps of: mixing the above components except for the initiator, and adding into a double-screw extruder; laterally feeding and metering the initiator, and adding into the extruder; and extruding and pelletizing to obtain the low temperature impact resistant nylon flexibilizer as a product. The graft ratio of the flexibilizer is increased and the gel content of the flexibilizer is reduced by the lateral feeding technology; after the flexibilizer is applied to nylon (nylon 6, nylon 66), the flexibilizer is good in comprehensive performance and more excellent in low temperature impact performance; and the notch impact strength of the flexibilizer can reach 600J/m at a temperature of -30 DEG C, so that the flexibilizer can be applied to the fields of auto accessories and bumpers, railway equipment and the like under low temperature resistance.
Owner:SHANGHAI SUNNY

Method for constructing super-hydrophilic layer of polyvinylidene fluoride hollow fiber ultrafiltration membrane

InactiveCN103537204AHydrophilicity is not easy to decayImprove hydrophilicitySemi-permeable membranesFiberHigh resistance
The invention provides a method for constructing a super-hydrophilic layer of a polyvinylidene fluoride hollow fiber ultrafiltration membrane and belongs to the technical field of materials. The method comprises the following steps of: generating C-C unsaturated bonds, hydroxyls and carboxyls on the surface of the polyvinylidene fluoride (PVDF) ultrafiltration membrane through pretreatment by using the mixed solution of a strong base and potassium permanganate, respectively grafting hydrophilic acrylic acid and alcohol monomers to the surface of the PVDF ultrafiltration membrane by free radical grafting reaction and esterification reaction under the actions of an inorganic acidic catalyst and an organic peroxide initiator, wherein a stable super-hydrophilic layer is constructued on the surface of the membrane under the synergic action of the two monomers to obstruct the adsorption and deposition of organic matters on the surface of the membrane efficiently. Consequently, the PVDF hollow fiber ultrafiltration membrane is provided with high resistance to organic matter pollution and super hydrophilicity; after super hydrophilic modification treatment, the water flux of the PVDF hollow fiber ultrafiltration membrane is 100-200% higher than before.
Owner:HARBIN INST OF TECH

Method for preparing polyamidoxime/graphene nanobelt composite aerogel and method for separating and enriching uranium

The invention discloses a method for preparing polyamidoxime/graphene nanobelt composite aerogel and separating and enriching uranium, which is characterized by comprising the following steps of: firstly, axially cutting a multiwalled carbon nanotube by using a potassium permanganate oxidation method to prepare a graphene oxide nanobelt; then adding into a mixed solution of acrylonitrile and ammonium persulfate which are fully mixed, and primarily preparing polyacrylonitrile/graphene nanobelt composite hydrogel by adopting a solvothermal polymerization method; and then converting cyano groupsinto amidoxime groups by virtue of a reaction between the cyano groups and hydroxylamine under an alkaline condition so as to obtain polyamidoxime/graphene nanoribbon composite hydrogel, and finally,carrying out low-temperature freeze drying so as to obtain the polyamidoxime/graphene nanoribbon composite aerogel. The prepared polyamidoxime/graphene nanobelt composite aerogel is high in grafting rate, uniform in density distribution, stable in structural performance and rich in special functional groups of uranium, the uranium can be effectively and selectively removed from different uranium-containing water bodies, the adsorbed aerogel can be rapidly separated and recycled from a solid-liquid system, and no pollution is caused to the environment.
Owner:EAST CHINA UNIV OF TECH

Preparation method of intelligent antibacterial polypeptide coating layer

A preparation method of an intelligent antibacterial polypeptide coating layer is a method universally applicable to different substrate materials. The preparation method includes the following steps: firstly, placing the substrate materials in a low temperature plasma generator main body chamber, vacuumizing, then introducing argon, loading with voltage and current, and carrying out plasma treatment; secondly, rapidly placing the substrate materials after treatment in a methanol solution with a certain amount of dimercaptan; and then, carrying out a reaction of the obtained substrate materials having the surface containing sulfydryl and an antibacterial polypeptide containing sulfydryl under an action of an antioxidant, and forming disulfide bonds. When the antibacterial polypeptide coating layer makes contact with bacterial cells, the disulfide bonds on the surface of the substrate materials are broken and are reduced to release the antibacterial polypeptide containing sulfydryl, so as to play a role of sterilization. The antibacterial activity of the antibacterial polypeptide in a free state is higher than that of a same antibacterial polypeptide covalently immobilized on a material surface, and the usage amount of the antibacterial polypeptide can be greatly reduced.
Owner:SOUTHEAST UNIV

Polyaspartic acid derivative and synthetic method thereof

InactiveCN107602858APrevent the growth of the main chainIncreased side chain branching rateSide chainPhosphoric acid
The invention provides a polyaspartic acid derivative synthetic method. The method comprises the following steps: monosaccharide or disaccharide and monochloro acetic acid are reacted under catalysisof NaOH, and a reactant is subjected to further acidifying and purification to obtain carboxymethyl saccharide; carboxymethyl saccharide and diamine are subjected to dehydration condensation under catalysis of phosphoric acid to obtain glycosyl acetyl diamine; L-aspartic acid and phosphoric acid are respectively added in a kneading reactor for mixing, a mixture is stirred and heated, polymerization is carried out for preset time to obtain polysuccinimide; glycosyl acetyl diamine is added in a reaction vessel of polysuccinimide for a reaction, polysuccinimide is subjected to ring-opening and grafting reaction to obtain a polysuccinimide derivative; the polysuccinimide derivative is added in a hydrolysis kettle, an aqueous solution of alkali is add drop by drop, a hydrolysis reaction is carried out, and a liquid-phase product after hydrolysis is a glycosyl acetyl diamine-grafted modified polyaspartate aqueous solution. The synthetic method is simple and easy to operate, a grafting modification step and a polymerization step are coupled, so that the side-chain grafting rate is increased and the polymericular weight can be regulated and controlled.
Owner:苏州美瑞姿生物科技有限公司

Method for nano modification of polyacrylamide flocculant

The invention discloses a method for nano modification of polyacrylamide flocculant, and belongs to the field of environment-friendly water treatment materials. The method includes the steps that chitosan is completely dissolved in an acetic acid solution in a magnetic stirring state, a sodium tripolyphosphate solution is added drop by drop, stirring is continued, and the mixed solution is put in an ultrasonic device to prepare a nano chitosan solution ultrasonically; acrylamide monomers and photoinitiator are added into the obtained solution and dissolved through stirring, nitrogen is introduced to remove oxygen and seal a reaction bottle, and the reaction bottle is placed under a low-voltage ultraviolet lamp to generate milk white colloid through illumination polymerization; the colloid is soaked in a mixed solution of absolute ethyl alcohol and acetone, flushed with distilled water, put into a vacuum drying oven to be dried, ground and screened to obtain the final nano chitosan/polyacrylamide flocculant in a white powder form. Reaction conditions are moderate, polymerization time is short, condensation cooling is not needed, energy consumption and cost are reduced, industrialization is easy, and the obtained modified polyacrylamide flocculant has adsorption and bridging capacity.
Owner:HOPE (NANJING) LIFE SCI INNOVATION INST CO LTD
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