Method for synthesizing graft polymer type amphoteric dry strength agent
The technology of graft polymer and dry strength agent is applied in the field of preparation of graft polymer type amphoteric dry strength agent, and can solve the problems of high cost of synthetic dry strength agent, too large or too small polymer, and high price. To achieve excellent paper dry enhancement effect, good effect and low cost effect
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Embodiment 1
[0028] Add 350g of water to the reaction kettle, add 35g of anionic starch under stirring, heat to 75°C for gelatinization for 2 hours, then add 87g of acrylamide, 16g of methacryloyloxyethyltrimethylammonium chloride, dimethylacrylic acid Amide 1g, mercaptoethanol 0.6g, hydroxypropyl acrylate 3g, ethyl acrylate 1.5g and benzophenone 0.6g were stirred evenly, and 55g of water was added to rinse the feeding port, and the reactor was repeatedly evacuated and nitrogen evacuated 2 to 3 times, and then Maintain nitrogen flow, raise the temperature of the reactor to 85°C, irradiate the reaction system with ultraviolet light, and react for 1.5 hours while maintaining a constant temperature. After that, take samples every 20 minutes for viscosity testing, and stop irradiating ultraviolet light after the viscosity reaches 7000mP*s Light, add 1g of liquid caustic soda (32%) to adjust the pH to 4-6, finally add 0.01g of hydroquinone, add water to adjust the solid content to 20±1%, which i...
Embodiment 2
[0030] Add 350g of water to the reaction kettle, add 58g of anionic starch under stirring, heat to 85°C for gelatinization for 1 hour, then add 58g of acrylamide, 5g of dimethylaminoethyl (meth)acrylate, and 0.08 methylenebisacrylamide g, 0.8 g of ethyl mercaptoacetate, 15 g of hydroxypropyl acrylate, 5 g of styrene and 0.5 g of benzophenone were stirred evenly, and the feeding port was rinsed with 50 g of water, and the reactor was repeatedly evacuated and nitrogen evacuated for 2 to 3 times, and then maintained Nitrogen was passed, the temperature of the reactor was raised to 75°C, and the reaction system was irradiated with ultraviolet light, and the reaction was kept at a constant temperature for 2 hours. After that, samples were taken every 20 minutes for viscosity testing. After the viscosity reached 5000mP*s, stop irradiating ultraviolet light. , add 1g of liquid caustic soda (32%) to adjust the pH to 4-6, finally add 2g of sodium bisulfite, add water to adjust the solid...
Embodiment 3
[0032]Add 450g of water to the reaction kettle, add 40g of anionic starch under stirring, heat to 95°C for gelatinization for 0.5 hours, then add 51g of acrylamide, 5g of methacryloyloxyethyltrimethylammonium chloride, methylenebis 0.03g of acrylamide, 0.2g of mercaptoethanol, 4g of methyl methacrylate, 1g of hydroxypropyl acrylate, 1g of ethyl acrylate and 0.5g of benzophenone, stir evenly, rinse the feeding port with 70g of water, and repeatedly evacuate the reaction kettle Nitrogen was passed for 2 to 3 times, and then the nitrogen was maintained. The temperature of the reactor was raised to 85°C, and the reaction system was irradiated with ultraviolet light. The reaction was kept at a constant temperature for 1.5 hours, and then samples were taken every 20 minutes for viscosity testing. After reaching 6500mP*s, stop irradiating 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 the final...
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