Preparation method of AKD emulsion free of surface active agent
A surfactant-free and emulsion-free technology, applied in the directions of adding water repellents, adding inorganic compounds, paper, etc., can solve the problems of easy generation of bubbles, complicated process, and reduced sizing efficiency, avoiding foaming problems and simple preparation process. , Good sizing effect
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Embodiment 1
[0022] Preparation of emulsifier and stabilizer: Disperse 2 parts of laponite in 398 parts of water, 1 part of PAC in 19 parts of water, uniformly mix PAC solution and hectorite dispersion as emulsifier; 15 parts of cationic tapioca starch Gelatinized in 265 parts of water as a stabilizer. Both were heated to 75°C for later use.
[0023] AKD emulsification: Weigh 100 parts of the industrial product AKD and melt it at 75°C, add the emulsifier prepared above into the melted AKD, keep the emulsification temperature at 75°C, and use a high-speed stirring device to stir and emulsify at 15,000 rpm for 5 minutes. Then add cationic starch gelatinization solution at 75°C, maintain the rotation speed and continue emulsifying for 3 minutes, then cool, and the AKD emulsion obtained is a uniform milky white oil-in-water (O / W) emulsion. The mass percentage of AKD is about 12.5%, and the particle size of the emulsion is 1-2 μm.
[0024] In-pulp sizing effect: Take 100 parts of poplar bleac...
Embodiment 2
[0026] Preparation of emulsifier and stabilizer: Disperse 5 parts of hectorite in 145 parts of water, disperse 2.5 parts of PAC in 7.5 parts of water, mix PAC solution and hectorite dispersion as emulsifier; 5 parts of cationic etherified corn Starch was gelatinized in 135 parts of water as a stabilizer. Both were heated to 85°C for later use.
[0027] Emulsification of AKD: Weigh 100 parts of the industrial product AKD, melt it at 85°C, add the emulsifier prepared above into the melted AKD, keep the emulsification temperature at 85°C, and use a high-speed stirring device to stir and emulsify at 20,000 rpm for 10 minutes. Then add cationic starch gelatinization solution at 85°C, keep stirring for 8 minutes at a constant speed, and cool down. The obtained AKD emulsion is a uniform milky white oil-in-water (O / W) emulsion. The mass percentage of AKD is about 25%, and the particle size of the emulsion is 1-3 μm.
[0028] In-pulp sizing effect: Take 50 parts of poplar bleached ch...
Embodiment 3
[0030] Preparation of emulsifier and stabilizer: Disperse 0.5 parts of laponite in 299.5 parts of water, disperse 2.5 parts of PAC in 17.5 parts of water, mix PAC solution and hectorite dispersion as emulsifier; 33.3 parts of cationic etherified potato Starch was gelatinized in 116.7 parts of water to make stabilizer. Both were heated to 55°C for later use.
[0031] Emulsification of AKD: Weigh 100 parts of industrial product AKD, heat to 55°C to melt, add the emulsifier prepared above into the melted AKD, keep the emulsification temperature at 55°C, and use high-speed stirring equipment to stir and emulsify at 10,000 rpm for 15 Minutes, then add cationic starch gelatinization solution at 55°C, continue to emulsify for 2 minutes, cool, and the prepared AKD emulsion is a uniform milky white oil-in-water (O / W) emulsion. The mass percentage of AKD is about 20%, and the particle size of the emulsion is 1-3 μm.
[0032] In-pulp sizing effect: Take 50 parts of hardwood pulp and 50...
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