Patent ID: 9695318
Date: 2017-07-04
CPC Classifications: C08G,C08H,C08K,C08L

Claim:
1. A method of preparing inorganic/lignin polymer composite nanoparticles, comprising: (1) dissolving an alkaline lignin solid into water to formulate a suspension at a concentration of 30%-50% by weight, adjusting the pH to 9-12 with an alkalinity regulator, heating to 60° C. -90° C., adding an activating agent, and reacting for 0.5-2 hours; dissolving a carboxylating agent in a formulation into water to formulate a solution at a concentration of 10%-30% by weight, adding to the above alkaline lignin suspension, and reacting for 1-3 hours at 60° C. -90° C. to obtain carboxylated alkaline lignin; (2) dissolving a phosphorylating agent in the formulation into water to formulate a solution at a concentration of 10%-35% by weight, adding epichlorohydrin, heating to 30° C. -90° C., and reacting for 0.5-3 hours to obtain a hydroxyl phosphate compound; (3) mixing the carboxylated alkaline lignin in (1) with the hydroxyl phosphate compound in (2), adjusting the pH to 10-13 with an alkalinity regulator, heating to 75° C. -95° C., reacting for 0.5-2 hours, and cooling to room temperature to obtain a liquid lignin polymer; (4) adding inorganic nanoparticles into water to formulate a suspension at a concentration of 10%-40% by weight, adding a pretreatment agent, stirring well before adding the liquid lignin polymer in (3), heating to 50° C.-80° C., reacting for 0.5-2 hours, then adding an acidity regulator to regulate the pH to 3-5 before ageing at 50° C. -80° C. for 0.5-4 hours, and then spray-drying to produce the inorganic/lignin polymer composite nanoparticles; the amount of each reactant is as follows in parts by weight: the activating agent is one or two agents selected from the group consisting of dioxane, sodium periodate, ethanol, isopropanol and acetone; the inorganic nanoparticles are one selected from the group consisting of nano silica, nano alumina, nano zinc oxide, nano titanium dioxide and nano calcium carbonate; the carboxylating agent is one or two agents selected from the group consisting of monochloroacetic acid, monobromoacetic acid, monoiodoacetic acid, sodium monochloroacetate and dichloroacetic acid; the phosphorylating agent is one or two agents selected from the group consisting of sodium dihydrogen phosphate, disodium hydrogen phosphate, dipotassium hydrogen phosphate, potassium dihydrogen phosphate, and diammonium hydrogen phosphate; and the pretreatment agent is one selected from the group consisting of ethanol, acetone, glycerol, isopropanol and cyclohexane.