Method for improving strength performance of calcium silicate filled paper
A technology of paper strength and calcium silicate, which is applied in the field of papermaking, can solve the problems of reducing paper strength performance, lint and powder on the paper surface, complicated pretreatment process, etc., and achieve the goal of improving strength performance, increasing filler content, and stable product quality Effect
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Embodiment 1
[0022] 1) Disintegrate chemical softwood pulp and chemical hardwood pulp respectively, dilute with water to make the pulp mass concentration 10%, and then refine according to the mass ratio of softwood: hardwood to 30% °SR, after refining, dilute the ground pulp with water to a mass concentration of 0.1%;
[0023] 2) The calcium silicate filler is configured into a filler suspension with a mass fraction of 15%, and the stirrer is used to stir at a speed of 500r / min, and a sulfuric acid solution with a mass concentration of 10% is gradually added to the filler suspension to make the filler suspension Drop from original pH=8~9 to pH 4.0;
[0024] 3) Add 20% dry weight (relative to the quality of the ground pulp) pretreated filler suspension to the ground pulp, and mix evenly to form paper stock; the retention aid cationic polyacrylamide The dosage per ton of paper was added to the paper material, mixed with the paper material for 20 seconds, and then formed on the Internet for ...
Embodiment 2
[0028] 1) Disintegrate chemical softwood pulp and chemical hardwood pulp respectively, dilute with water to make the pulp mass concentration 10%, and then refine according to the softwood: hardwood mass ratio of 1:4 to a beating degree of 40 °SR, after refining, dilute the ground pulp with water to a mass concentration of 0.25%;
[0029] 2) The calcium silicate filler is configured into a filler suspension with a mass fraction of 10%, and the stirrer is used to stir at a speed of 650r / min, and a sulfuric acid solution with a mass concentration of 30% is gradually added to the filler suspension to make the filler suspension Drop from original pH=8~9 to pH 5.4;
[0030] 3) Add 30% dry weight (relative to the quality of the ground pulp) pretreated filler suspension to the ground pulp, and mix evenly to form a paper stock; the retention aid cationic polyacrylamide The amount per ton of paper was added to the paper material, mixed with the paper material for 30 seconds, and then f...
Embodiment 3
[0034] 1) Disintegrate chemical softwood pulp and chemical hardwood pulp respectively, dilute with water to make the pulp mass concentration 10%, and then refine according to the softwood: hardwood mass ratio of 1:4 to a beating degree of 45 °SR, after refining is completed, dilute the ground pulp with water to a mass concentration of 0.3%;
[0035] 2) The calcium silicate filler is configured into a filler suspension with a mass fraction of 5%, and the stirrer is used to stir at a speed of 800r / min, and a sulfuric acid solution with a mass concentration of 60% is gradually added to the filler suspension to make the filler suspension Drop from original pH=8~9 to pH 6.0;
[0036] 3) Add 50% dry weight (relative to the quality of the ground pulp) pretreated filler suspension to the ground pulp, and mix evenly to form paper stock; the retention aid cationic polyacrylamide The amount per ton of paper was added to the paper material, mixed with the paper material for 40 seconds, a...
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