Preparation method of high-electropositivity AKD internal sizing agent
A technology of sizing in pulp and electrical properties, applied in the direction of water-repellent agent addition, non-fiber pulp addition, paper, etc., can solve the problems of reduced sizing effect, weak electropositive property, difficulty in meeting the requirements of paper waterproofness, etc.
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Embodiment 1
[0024] Add 15 parts of polyamine monomer and 5 parts of organic solvent into the reactor, start stirring and raise the temperature to 80°C, then add 22 parts of alkyl epoxy polyether dropwise to the system for 1 hour, and then continue to keep warm 3.5h. Finally, a certain amount of 4.5 parts of AKD powder was added at one time, and the reaction was continued for 2 hours. Finally, add a certain amount of deionized water, adjust the pH value to 3, cool down and discharge to obtain a highly electropositive AKD emulsifier, which is called component A. Then mix according to AKD:component A=100:10, raise the temperature of the system to 60°C, keep warm for 10 minutes after the AKD is completely melted, then add a certain amount of deionized water to keep the solid content of the system at 20%, disperse at high speed for 10 minutes, Then quickly lower the temperature to obtain a highly electropositive AKD slurry internal sizing agent.
Embodiment 2
[0026] Add 37 parts of polyamine monomer and 15 parts of organic solvent into the reactor, start stirring and raise the temperature to 85°C, then add 36 parts of alkyl epoxy polyether dropwise to the system for 1.5 hours, and then continue to keep warm 5h. Finally, a certain amount of 7.5 parts of AKD powder was added at one time, and the reaction was continued for 2 hours. Finally, add a certain amount of deionized water, adjust the pH value to 3, cool down and discharge to obtain a highly electropositive AKD emulsifier, which is called component A. Then mix according to AKD:component A=100:16, raise the temperature of the system to 68°C, keep warm for 10 minutes after the AKD is completely melted, then add a certain amount of deionized water to keep the solid content of the system at 25%, disperse at high speed for 10 minutes, Then quickly lower the temperature to obtain a highly electropositive AKD slurry internal sizing agent.
Embodiment 3
[0028] Add 15 parts of polyamine monomer and 5 parts of organic solvent into the reactor, start stirring and raise the temperature to 80°C, then add 22 parts of alkyl epoxy polyether dropwise to the system for 1 hour, and then continue to keep warm 3.5h. Finally, a certain amount of 4.5 parts of AKD powder was added at one time, and the reaction was continued for 2 hours. Finally, add a certain amount of deionized water, adjust the pH value to 3.5, cool down and discharge to obtain a highly electropositive AKD emulsifier, which is called component A. Then mix according to AKD:component A=100:13, raise the temperature of the system to 65°C, keep warm for 10 minutes after the AKD is completely melted, then add a certain amount of deionized water to keep the solid content of the system at 22%, disperse at high speed for 10 minutes, Then quickly lower the temperature to obtain a highly electropositive AKD slurry internal sizing agent.
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