35 results about "N,N-Methylenebisacrylamide" patented technology

The invention discloses a method for preparing super absorbent resin with a cross-linked structure by using potato starch as the raw material, 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 potato starch with de-ionizedwater and pasting the mixture; mixing the neutralized acrylic acid and the sodium salt solution thereof with the pasted potato starch; adding an evocating agent persulfate and a cross-linking agent N,N'- methylene-bisacrylamide; uniformly stirring the mixture under the protection of nitrogen; heating the mixture by water bath to rise the temperature so as to ensure that the potato starch and the acrylic acid and the sodium salt thereof generate graft copolymerization reaction under the protection of nitrogen; keeping the temperature of the reaction; and baking and crashing to obtain the superabsorbent resin with a cross-linked structure. Compared with similar products, the water absorption of the super absorbent resin is greatly enhanced and the super absorbent resin can absorb a certainamount of heavy metal ion. The super absorbent resin has great effect on the water conservation, the desert control, the environmental improvement and the like of soil in dry regions.

The invention discloses a preparation method of a resin-type water-retaining agent. Starch, acrylic acid and acrylamide are used as raw materials, a redox system formed by potassium persulfate-sodium bisulfite is used as an initiator, and N, N'-methylene The specific steps are as follows: 1) first gelatinize the starch in the reactor, then neutralize the acrylic acid with potassium hydroxide, cool to room temperature and pour it together with the acrylamide aqueous solution Put into the reactor and mix with the starch after gelatinization; 2) add initiator, cross-linking agent, in N 2 Stirring at a constant temperature under protection until the end of the polymerization reaction; 3) adjusting the pH to neutral with lye, and washing, filtering, drying and pulverizing the grafted product to obtain a white granular resin product. The water-retaining agent obtained by the invention has fast water absorption rate and high water absorption rate, and replaces traditional sodium hydroxide with potassium hydroxide, which can prevent excessive sodium ions from destroying soil structure in agricultural applications, and can provide potassium fertilizer for crops at the same time.

The invention discloses a method for synthesizing high-molecular water-absorbent resin from a cottonseed byproduct. The method comprises the following steps: slowly adding a sodium hydroxide solution to an aqueous acrylic acid solution in a dropwise manner at room temperature until the neutralization value is 75%, cooling the neutralized solution, and adding a cross-linking agent N-N'-methylenebisacrylamide to obtain a monomer and cross-linking agent mixed solution; adding distilled water to cottonseed meal, stirring the distilled water and the cottonseed meal in constant-temperature water bath to gelatinize the cottonseed meal, adjusting the above obtained mixed solution to be alkaline by using the sodium hydroxide solution, introducing nitrogen, adding an initiator potassium persulfate, stirring, adding the prepared monomer and cross-linking agent mixed solution, continuously stirring until the obtained reaction mixed solution is thickened, immediately pouring the reaction mixed solution to a pallet, and carrying out a reaction in the constant-temperature water bath to obtain polymer gel; and taking out the polymer gel, cutting the polymer gel, carrying out vacuum drying, crushing the dried polymer gel, screening the crushed polymer gel, and packaging the screened polymer gel to obtain the target product. The product has the advantages of strong water absorption effect, small volume expansion, excellent compressive strength, good heat stability, slow degradation speed and harmlessness to crops, and is especially suitable for oilfield and the agriculture.

The invention relates to a preparation method of high-strength nano-composite hydrogel capable of rapidly responding to pH and temperature. The preparation method taking dimethylaminoethyl methacrylate as a monomer, inorganic nanometer clay and N,N'-methylenebisacrylamide as co-crosslinking agents, and a nanometer cellulose whisker as a gel composite reinforcer comprises the following steps of: stirring the components, carrying out uniform ultrasonic oscillation, carrying out photo-initiation free radical polymerization in 0 DEG C ice-bath, then reacting at -18 DEG C for 24 hours to obtain the final gel product. The hydrogel prepared by the method has the dual responses of temperature and pH and excellent mechanical performance and can rapidly swell and deswell; and the lowest transformation temperature of the hydrogel is close to temperature of human bodies; raw materials are cheap; the preparation method is simple; and the high-strength nano-composite hydrogel has the potential of application in fields such as sustained release of medicines and tissue engineering.

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.

With the continuous development of tissue engineering, a surface patterning technology is concerned by people more and more and widely applied; and a micro-patterning technology is already used for accurately controlling the position and form of a cell and the co-culture of multiple cells, but a micro-pattern is more difficult to be directly constructed on the surface of hydrogel with good biocompatibility. The high-elasticity and high-toughness patterning hydrogel membrane is prepared on a patterning silicon slice base body by taking sodium alginate as a high-molecular framework, acrylamide and a derivative thereof as polymerization monomers, divinylbenzene, N,N'-methylene bisacrylamide or ethylene glycol dimethacrylate as chemical cross-linking agents and a metal salt water solution as an ionic cross-linking agent and adding inorganic nanoparticles as strengthening agents. The preparation method disclosed by the invention has the advantages of good controllability, simple process, low cost, good material biocompatibility, and the like; and the patterning hydrogel membrane disclosed by the invention is hopeful to be applied to the fields of stem cell culture, tissue regeneration, and the like.

The invention discloses a method for preparing super absorbent resin with high potassium content by using carboxymethyl potato starch as the raw material, which comprises the following main processes: carrying out neutralization reaction between a potassium hydroxide (potassium carbonate) solution and acrylic acid from which polymerization inhibitor is removed under the cooling of ice-water bath;mixing carboxymethyl potato starch with de-ionized water; mixing the prepared acrylic acid and the sylvite solution thereof with the carboxymethyl potato starch solution; adding an evocating agent persulfate and a cross-linking agent N,'- methylene-bisacrylamide; stirring the mixture under room temperature; heating the mixture by water bath to rise the temperature to rise to ensure that the carboxymethyl potato starch and the acrylic acid and the sylvite thereof 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 higher content of potassium nutrition element and greatly improves the preparation process by not pasting the carboxymethyl potato starch. The super absorbent resin has great effect on the water conservation, the desert control, the plant growth promotion and the like of soil in dry regions.

The invention discloses a method for preparing super absorbent resin by using carboxymethyl potato starch as the raw material, 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 carboxymethyl potato starch with de-ionized water; mixing the prepared acrylic acid and the sodium salt solution thereof with the carboxymethyl potato starch 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 gradually so as to ensure that the carboxymethyl potato starch and the acrylic acid and the sodium salt thereof generate graft copolymerization reaction under the protection of nitrogen; keeping the temperature of the reaction; drying and crashing to obtain the super absorbent resin by using carboxymethyl potato starch as the raw material. Compared with similar products, the water absorption of the super absorbent resin is greatly enhanced, the process of pasting is omitted in comparison with the process of using starch as the raw material and the preparation process is greatly improved. The super absorbent resin has great effect on the water conservation, the production of the physical hygiene sundries, the environmental improvement, the desert control, the plant growth promotion and the like of soil in dry regions.

An electro-responsive intelligent polymer catalyst and a preparation method thereof, comprising 40% to 20% of vinylimidazole, 40% to 20% of 2-acrylic acid amino-2-methyl-1-propanesulfonic acid, N, N'- 11% to 22% of methylene bisacrylamide forms a cross-linked polymer compound, and at the same time, it is composed of 9% to 18% of reagents; the preparation method is: Step 1: from raw materials vinylimidazole, 2-acrylic acid amino-2-methanol Radical-1-propanesulfonic acid and N, N'-methylenebisacrylamide were polymerized by radical emulsion to obtain a cross-linked electro-responsive intelligent polymer catalyst; step 2: test of catalytic activity. The advantages of the present invention: 1. The electrical response intelligent polymer catalyst introduces flexibility and mobility into the structure of the polymer catalyst, which can solve the accessibility problem of the polymer catalyst and improve the catalytic activity; 2. The electrical response intelligence is high Molecular catalysts can be used as an artificial enzyme model to simulate the flexibility of enzymes.

The invention discloses a method for preparing super absorbent resin with a cross-linked structure from potato starch phosphate graft co-polymeric acrylic acid and a sodium salt thereof. The method comprises the following main technological processes of: under ice water bath cooling, performing neutralization reaction between a sodium hydroxide solution and acrylic acid used for removing a polymerization inhibitor so as to prepare the acrylic acid and a sodium salt solution of the acrylic acid; mixing the prepared acrylic acid and the sodium salt solution of the acrylic acid with potato starch phosphate; adding an initiator of persulfate, a crosslinking agent of N,N'-methylene bi-acrylamide so that the mixture is mixed evenly under stirring; then under the protection of nitrogen gas, heating the mixture in a water bath and stirring the mixture so that the potato starch phosphate performs graft copolymerization with the acrylic acid and the sodium salt solution of the acrylic acid; stopping stirring after reaching a certain temperature, performing heat preservation reactions, and then stopping introducing the nitrogen gas; and taking out a product, cutting the product into small pieces, drying the small pieces in a drying oven to have constant weights, and crushing the small pieces to obtain the super absorbent resin.

The invention relates to a self-reinforced hybrid hydrogel used for artificial muscles and a preparation method thereof. According to the invention, sodium alginate is used as a high-molecular skeleton, acrylamide and derivative thereof are used as polymerizable monomers, divinyl benzene, N,N'-methylene bis acrylamide or ethylene glycol dimethacrylate is used as a chemical cross-linking agent, an aqueous metal salt solution is used as an ion cross-linking agent, and then the hydrogel with high elasticity and high toughness is prepared. During a process of preparing the hydrogel, an organic matter emulsion containing metal ion aqueous solution is added. When the prepared hydrogel is stretched by external forces to a certain extent, the gel deforms to extrude the organic matter emulsion, and metal ions are released and then crosslinked with the sodium alginate in the hybrid gel, thereby substantially improving gel intensity and preventing gel fracture. The preparation method has advantages of good controllability, simple technology and low cost, the obtained hydrogel material can be self-reinforced, and is expected to be applied in fields of artificial cartilage, artificial muscle, flexible robot manufacture, etc.