2 results about "Carbodiimide" patented technology

The invention provides a preparation method of a pH-responsive quick self-repairing collagen-based hydrogel with adhesivity, antibiosis and pressure resistance. The preparation method comprises the following steps: S1, weighing PEG 2000, 4-formylbenzoic acid and dimethylaminopyridine, dissolving in tetrahydrofuran, adding N, N'-dicyclohexylcarbodiimide in a nitrogen atmosphere, stirring, and then filtering to obtain a white solid; dissolving the white solid in tetrahydrofuran, precipitating in diethyl ether, drying to obtain DA-PEG, and dissolving in water to prepare a DA-PEG solution; S2, weighing and mixing a prepared collagen solution with a chitosan solution, wherein the mass ratio of the collagen solution to the chitosan solution is 3: 1-1: 3 to obtain a collagen/chitosan mixed solution; S3, adding a DA-PEG solution into the collagen/chitosan mixed solution under an ice bath condition to prepare a collagen/chitosan/DA-PEG mixed solution, adjusting the pH value to be 3.6-4.8, and uniformly mixing; and standing to obtain the pH-responsive quick self-repairing collagen-based hydrogel with adhesiveness, antibiosis and pressure resistance.

The invention provides an anti-flaming viscose. Melamine is grafted on the viscose, so that the viscose has fire resistance. A method for preparing the anti-flaming viscose by grafting melamine with an oxidized viscose comprises the following steps: (1) preparing a pretreated viscose, adding the viscose into a sodium hydroxide solution, reacting while boiling, taking out after reaction, cleaning,drying and standing by; (2) preparing the oxidized viscose, dispersing the pretreated viscose into a dilute nitric acid solution, stirring, aerating and performing oxidizing reaction, taking out the fiber after the ending of reaction, washing, drying and standing by; (3) preparing a melamine ethanol solution, using diluted hydrochloric acid for regulating pH to 4-5.5, preparing a N,N'-dicyclohexylcarbodiimide ethanol solution, adding the melamine ethanol solution into a reaction vessel, dispersing the oxidized viscose into the melamine ethanol solution, stirring and aerating, adding the N,N'-dicyclohexyl carbodiimide ethanol solution in batches, and reacting under a constant temperature. The oxygen index of the acquired product can reach up to 32-40%.