Paper preparation method using modified calcium carbonate as filler
A calcium carbonate and modified technology, applied in papermaking, raw material separation, textiles and papermaking, etc., can solve the problems of negative impact on optical properties of paper, large decline in paper strength properties, insufficient stability of modified fillers, etc. Promotion, low price, good film-forming effect
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[0028] Example 1
[0029] A paper preparation method using modified calcium carbonate as a filler includes the following steps:
[0030] (1) Put the pulp raw material into water at 90°C for 1.5 hours, remove it and put it in the pulper, and add 0.5% of the absolute dry mass of the pulp raw material together with a silane coupling agent for knocking. It is 30°SR to obtain the pulp after percussion, ready for use;
[0031] (2) Add light calcium carbonate to water to prepare a calcium carbonate suspension with a concentration of 40%, and heat it for 15 minutes while stirring in a water bath at 70°C for use;
[0032] (3) Add cationic starch into water to prepare a starch suspension with a concentration of 50%, stir at 80°C for 10 minutes, and then gelatinize at 92°C for 20 minutes;
[0033] (4) Adjust the gelatinized starch solution pH to 8 with 5% NaOH solution, then add 10% sodium stearate solution, mix and stir for 20 minutes at 80°C, 200r / min to form a composite Thing, spare
[0034] (...
Example Embodiment
[0038] Example 2
[0039] A paper preparation method using modified calcium carbonate as a filler includes the following steps:
[0040] (1) Put the pulp raw material into water at 90~95℃ for 3h, remove it and put it in the pulper, and add 2.5% of the absolute dry mass of the pulp raw material together with the silane coupling agent for knocking. The degree is 45°SR, and the pulp after tapping is obtained for use;
[0041] (2) Add light calcium carbonate to water to prepare a calcium carbonate suspension with a concentration of 55%, and heat it in a water bath at 80°C for 20 minutes while stirring, for use;
[0042] (3) Add cationic starch into water to prepare a starch suspension with a concentration of 65%, stir at 85°C for 15 minutes, and then gelatinize at 95°C for 30 minutes;
[0043] (4) Adjust the pH value of the gelatinized starch solution to 10 with 8% NaOH solution, then add 15% sodium stearate solution, mix and stir for 30 minutes at 90℃, 250r / min to form a composite Thing,...
Example Embodiment
[0048] Example 3
[0049] A paper preparation method using modified calcium carbonate as a filler includes the following steps:
[0050] (1) Put the pulp raw material into 91℃ water for 1.8 hours, remove it and put it in the pulper, and add 0.7% of the absolute dry mass of the pulp raw material together with the silane coupling agent for knocking. For 35°SR, get the pulp after percussion, for use;
[0051] (2) Add light calcium carbonate to water to prepare a calcium carbonate suspension with a concentration of 45%, and heat it for 16 minutes while stirring in a water bath at 72°C for use;
[0052] (3) Add cationic starch into water to prepare a starch suspension with a concentration of 52%, stir at 81°C for 11 minutes, and then gelatinize at 93°C for 22 minutes;
[0053] (4) Adjust the pH value of the gelatinized starch solution to 7 with a 6% NaOH solution, then add a 11% sodium stearate solution, mix and stir for 21 minutes at 82°C and 210r / min to form a composite Thing, spare
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