Preparation method of high-electropositivity AKD internal sizing agent

Abstract

The invention discloses a preparation method of a high-electropositivity AKD internal sizing agent, comprising the following steps: adding a certain amount of a polyamine monomer and an organic solvent into a reactor, dropwise adding a certain amount of alkyl epoxy polyether into the system, adding a certain amount of AKD raw powder once, finally adding a certain amount of deionized water, adjusting pH value to 3-4, cooling and discharging to obtain a high-electropositivity AKD emulsifier which is called ingredient A; mixing AKD and the ingredient A according to a certain proportion, heating the system to 60-70 DEG C, continuously carrying out heat insulation for 10 min after the AKD is completely melted, adding a certain amount of deionized water, and rapidly cooling to obtain the high-electropositivity AKD internal sizing agent. The prepared internal sizing agent has high electropositivity and excellent retention property. Meanwhile, reaction between AKD and hydroxyl group on the surface of fiber can be promoted in the presence of lots of ammonium salt. Through application in a few amount, waterproofness can be effectively and rapidly formed, and paper performance is greatly improved.

Description

technical field

[0001] The invention relates to a preparation method of a paper pulp internal sizing agent, in particular to a preparation method of a highly electropositive AKD pulp internal sizing agent. Background technique

[0002] In recent years, with the increasingly higher requirements for environmental protection, the requirements for the treatment and discharge of papermaking wastewater and waste residues have been continuously improved. With the use and the improvement of the sealing degree of the white water cycle of the paper machine, the concentration of interfering anion impurities in the wet end of the paper machine is getting higher and higher, which is more harmful to the operation of the wet end of the paper machine, and makes some such as PAE wet strength agents and cationic AKD The effect of cationic additives such as internal pulp sizing agent and ASA internal pulp sizing agent becomes worse. Especially with the conversion of papermaking to the alkalin...

Examples

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.

technical field

[0001] The invention relates to a preparation method of a paper pulp internal sizing agent, in particular to a preparation method of a highly electropositive AKD pulp internal sizing agent. Background technique

[0002] In recent years, with the increasingly higher requirements for environmental protection, the requirements for the treatment and discharge of papermaking wastewater and waste residues have been continuously improved. With the use and the improvement of the sealing degree of the white water cycle of the paper machine, the concentration of interfering anion impurities in the wet end of the paper machine is getting higher and higher, which is more harmful to the operation of the wet end of the paper machine, and makes some such as PAE wet strength agents and cationic AKD The effect of cationic additives such as internal pulp sizing agent and ASA internal pulp sizing agent becomes worse. Especially with the conversion of papermaking to the alkalin...

Examples

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.