Preparation method of graft polymer type cationic dry strength agent
A technology of graft polymer and dry strength agent, which is applied in the field of preparation of graft polymer type cationic dry strength agent, can solve the problem of high cost of synthetic dry strength agent, too large or too small polymer, gelation, etc. problem, to achieve excellent paper dry enhancement effect, good effect, and prevent gelation effect
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Embodiment 1
[0028] Add 350g of water to the reaction kettle, add 35g of cationic starch under stirring, heat to 75°C for gelatinization for 2 hours, then add 85g of acrylamide, 16g of methacryloyloxyethyltrimethylammonium chloride, and dimethylacrylamide in sequence Mix 1g of amide, 0.6g of ethyl thioglycolate, 3g of hydroxypropyl acrylate, 1.5g of ethyl acrylate and 0.6g of benzophenone, add 55g of water to rinse the feeding port, and repeatedly evacuate the reactor for 2 to 3 times. , and then maintain the nitrogen flow, raise the temperature of the reactor to 85°C, irradiate the reaction system with ultraviolet light, and react for 1.5 hours at a constant temperature, and then start sampling every 20 minutes for viscosity testing, and stop when the viscosity reaches 7000mP*s Irradiate with ultraviolet light, add 0.5g of sulfuric acid (15%) to adjust the pH to 4-6, finally add 0.01g of hydroquinone, add water to adjust the solid content to 20±1%, which is the final product.
Embodiment 2
[0030] Add 350g of water to the reaction kettle, add 58g of cationic starch under stirring, heat to 85°C for gelatinization for 1 hour, then add 55g of acrylamide, 5g of methacryloyloxyethyl trimethyl ammonium chloride, methylene bis 0.08g of acrylamide, 0.8g of mercaptoethanol, 15g of hydroxypropyl acrylate, 5g of styrene and 0.5g of benzophenone were stirred evenly, and the feeding port was rinsed with 50g of water, and the reaction kettle was repeatedly evacuated and nitrogen evacuated for 2 to 3 times, and then Maintain nitrogen flow, raise the temperature of the reactor to 75°C, irradiate the reaction system with ultraviolet light, and react for 2 hours while maintaining a constant temperature. After that, take samples every 20 minutes for viscosity testing. Stop irradiating ultraviolet light after the viscosity reaches 5000mP*s Light, add 0.5g of sulfuric acid (15%) to adjust the pH to 4-6, and finally add 2g of sodium bisulfite, add water to adjust the solid content to 2...
Embodiment 3
[0032] Add 450g of water to the reaction kettle, add 40g of cationic starch under stirring, heat to 95°C for gelatinization for 0.5 hours, then add 47g of acrylamide, 5g of dimethylaminoethyl (meth)acrylate, and 0.03 methylenebisacrylamide in sequence g, 0.2 g of sodium allyl sulfonate, 4 g of methyl methacrylate, 1 g of hydroxypropyl acrylate, 1 g of ethyl acrylate, and 0.5 g of benzophenone were stirred evenly, and the feeding port was rinsed with 70 g of water, and the reaction kettle was pumped repeatedly. Vacuum nitrogen for 2 to 3 times, then maintain nitrogen, raise the temperature of the reactor to 85°C, irradiate the reaction system with ultraviolet light, and react for 1.5 hours at a constant temperature, and then start sampling every 20 minutes for viscosity testing. After the viscosity reaches 6500mP*s, stop the irradiation of ultraviolet light, adjust the pH to 4-6, and finally add 0.01g of p-benzoquinone, add water to adjust the solid content to 15±1%, which is th...
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