Papermaking surface sizing agent emulsified by magnetic composite particles and preparation method thereof
A surface sizing agent and particle emulsification technology, applied in the field of papermaking, can solve the problems of complex AKD emulsification process, environmental pollution and difficult control, and achieve the effects of avoiding adverse effects, reducing costs and improving pollution.
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Embodiment 1
[0037] A papermaking surface sizing agent emulsified by magnetic composite particles, the preparation method of which is as follows:
[0038] (1) Nano-Fe 3 o 4 Granular and Nano SiO 2 The particles were mixed according to the mass ratio of 1:1, and heated and stirred in a water bath at 50°C for 2 hours to obtain silicon dioxide-coated iron ferric oxide nanometer solid particles; Disperse iron oxide nanometer solid particles in deionized water, stir evenly to obtain a suspension, adjust the pH value of the suspension to 7 with 0.1mol / L hydrochloric acid, and obtain a well-dispersed, precipitate-free magnetic composite particle suspension after stirring evenly ; Wherein, the mass fraction of ferric iron tetroxide nanometer solid particles coated with silicon dioxide in the magnetic composite particle suspension is 1%;
[0039](2) Add hexadecyl ketene dimer to the reaction kettle, slowly add polyvinyl alcohol, raise the temperature to 80°C to make the additive in the reaction ...
Embodiment 2
[0046] A papermaking surface sizing agent emulsified by magnetic composite particles, the preparation method of which is as follows:
[0047] (1) Nano-Fe 3 o 4 Granular and Nano SiO 2 The particles were mixed according to the mass ratio of 1:1, heated and stirred in a water bath at 60°C for 2 hours to obtain silicon dioxide-coated iron ferric oxide nano-solid particles; Disperse iron oxide nanometer solid particles in deionized water, stir evenly to obtain a suspension, adjust the pH value of the suspension to 8 with 0.1mol / L sodium acetate solution, and obtain well-dispersed, non-precipitating magnetic composite particles after stirring evenly Suspension; wherein, the mass fraction of ferric oxide nanometer solid particles coated with silicon dioxide in the magnetic composite particle suspension is 2%;
[0048] (2) Add the tetradecyl ketene dimer to the reaction kettle, slowly add polyvinyl alcohol, raise the temperature to 85°C to make the additive in the reaction kettle ...
Embodiment 3
[0055] A papermaking surface sizing agent emulsified by magnetic composite particles, the preparation method of which is as follows:
[0056] (1) Nano-Fe 3 o 4 Granular and Nano SiO 2 The particles were mixed according to the mass ratio of 2:1, and heated and stirred in a water bath at 40°C for 2 hours to obtain silicon dioxide-coated iron ferric oxide nano-solid particles; Disperse ferric oxide nanometer solid particles in deionized water, stir evenly to obtain a suspension, adjust the pH value of the suspension to 9 with 0.1mol / L sodium hydroxide solution, and obtain a well-dispersed, precipitation-free magnetic complex after stirring evenly Particle suspension; wherein, the mass fraction of ferric oxide nanometer solid particles coated with silicon dioxide in the magnetic composite particle suspension is 3%;
[0057] (2) Add the dodecyl ketene dimer to the reaction kettle, slowly add polyvinyl alcohol, raise the temperature to 85°C to make the additive in the reaction ke...
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