Modified xanthan gum surface sizing agent, and preparation method thereof
A technology of surface sizing agent and xanthan gum, applied in the direction of adding water repellent, can solve the problems of reducing the viscosity of cationic starch, production and environmental impact, poor fiber affinity, etc., achieve good economic and environmental benefits, improve uniformity The effect of improving the degree and surface strength
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Embodiment 1
[0022] Add 100 parts by weight of ethanol to the reaction kettle at room temperature, start stirring, add 100 parts by weight of xanthan gum under stirring, after the dispersion is uniform, add and heat up to 50°C, activate at this temperature for 60 minutes, add an oxidizing agent with a weight concentration of 30 % hydrogen peroxide 2.0 parts by weight, after stirring for 10 minutes to mix evenly, adding a weight concentration of 30% sodium hydroxide solution to adjust the pH value of the solution to 9.5, after continuing to keep warm for 5 hours, cooling to 30 ° C, adding hydrochloric acid to the solution When the pH reaches 7.0, it is suction filtered, dried, pulverized, passed through a 100-mesh sieve, and packed for use.
Embodiment 2
[0024] Add 100 parts by weight of methanol to the reaction kettle at room temperature, start stirring, add 50 parts by weight of xanthan gum under stirring, after the dispersion is uniform, add and heat up to 60°C, activate at this temperature for 50 minutes, add the oxidant ammonium persulfate 0.5 parts by weight, after stirring for 10 minutes to mix evenly, adding a sodium hydroxide solution with a weight concentration of 10% to adjust the pH value of the solution to 9.0, and after continuing to insulate for 4 hours, cool down to 35 ° C, and adjust the pH value of the solution to 6.0, suction filtered, dried, pulverized, passed through a 100-mesh sieve, and packed for use.
Embodiment 3
[0026] Add 150 parts by weight of petroleum ether to the reaction kettle at room temperature, start stirring, add 100 parts by weight of xanthan gum under stirring, after the dispersion is uniform, add and heat up to 70°C, activate at this temperature for 40 minutes, add the oxidant permanganese 2.0 parts by weight of potassium nitrite, after stirring for 10 minutes to mix evenly, add 20% sodium hydroxide solution by weight to adjust the pH value of the solution to 10, continue to keep warm for 3 hours, cool down to 30 ° C, add glacial acetic acid to make the pH of the solution 8.0, suction filtered, dried, pulverized, passed through a 100-mesh sieve, and packed for use.
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