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Amphoteric calcium carbonate filling and preparation method thereof

A calcium carbonate and amphoteric technology, applied in fiber raw material processing, inorganic compound addition, paper, etc., can solve the problems that cannot be fully compensated, affect starch and improve paper dry strength, and achieve improved paper strength, easy control, and low reaction temperature Effect

Inactive Publication Date: 2009-07-15
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the adsorption of cationic polymers cannot fully compensate the demand for the surface charge of fibers and fillers. When the amount of calcium carbonate filler is 30%, no matter how much cationic polymer is added, the highest retention rate of fillers may reach 88%.
However, sharing anionic and cationic polyacrylamide can produce excellent retention effect; the synergistic retention effect of cationic starch and cationic polyacrylamide can make the retention rate of filler close to 100%, but the sharing of the two will cause Affects the ability of starch to increase paper dry strength

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Raw material formula: collagen 0.16g, calcium chloride 4.8g, sodium carbonate 5.3g, water 250ml.

[0031] Mix 4.8g of calcium chloride and 5.3g of sodium carbonate evenly, dissolve 0.16g of collagen in 250ml of water, and slowly add to the mixture of calcium chloride and sodium carbonate. The reaction was left to stand at 4°C for 7 days, filtered with suction, washed with water, and freeze-dried.

Embodiment 2

[0033] Raw material formula: gelatin 30.0g, calcium chloride 85.0g, sodium carbonate 53.0g, water 1000ml.

[0034] Dissolve 85.0g of calcium chloride and 53.0g of sodium carbonate in 200ml of water, and then mix evenly. Dissolve 30.0g of gelatin in 800ml of water and slowly add to the mixture of calcium chloride and sodium carbonate. Stand at room temperature and react for 1 day, centrifuge, wash with water, and dry in vacuum.

Embodiment 3

[0036] Raw material formula: gelatin 15.0g, calcium chloride 28.0g, sodium carbonate 24.0g, water 600ml.

[0037] Mix 28.0 g of calcium chloride and 24.0 g of sodium carbonate, dissolve 15.0 g of gelatin in 600 ml of water, and slowly add to the mixture of calcium chloride and sodium carbonate while stirring. Stir at room temperature for 2 hours, let stand for 30 minutes, filter, wash with water, and dry at room temperature.

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PUM

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Abstract

The invention relates to a novel amphoteric calcium carbonate filler and a preparation method thereof. The raw material components are: a protein aqueous solution with a protein content of 0.01% to 8% by weight; a mixture of calcium chloride and carbonate with a molar ratio of 0.8 to 2:1; a mass ratio of protein to carbonate with a mass ratio of 0.01 to 4 : 1. Under the action of a specific matrix, calcium salts and carbonates are mixed and reacted to prepare amphoteric calcium carbonate with different shapes and particle sizes. After the reaction, two phases are obtained: the upper layer contains a chloride salt liquid phase and the lower layer contains a certain matrix. White calcium carbonate Solid Phase. The form of calcium carbonate includes petal shape, spindle shape, spherical shape, flake shape and so on. This amphoteric calcium carbonate filler is used as a paper-making filler, which can increase the combination between fibers and fillers, fibers and fibers, improve the retention rate of fillers and fine fibers in pulp; increase filler content and improve paper quality at the same time.

Description

technical field [0001] The invention belongs to the field of paper-making additives, and in particular relates to an amphoteric calcium carbonate filler and a preparation method thereof, in particular to a method for preparing a protein-modified calcium carbonate additive by utilizing protein and inorganic substances. Background technique [0002] Calcium carbonate is an important paper-making filler. The use of fillers in paper mills can reduce production costs and energy consumption. The filling of calcium carbonate between paper fibers can improve the opacity, whiteness, softness and gloss of paper, and provide the necessary performance and end-use characteristics. However, due to the physical adsorption of calcium carbonate on the paper fibers, the active surface for bonding between fibers is reduced, not only the strength of the paper is reduced, the demand for sizing is increased, and the loss rate of calcium carbonate is large. [0003] By adding polyelectrolyte, the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H17/69D21H17/22
Inventor 付丽红齐永钦
Owner QILU UNIV OF TECH