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Starch-coated modified calcium carbonate and preparation method thereof

A technology of calcium carbonate and starch, which is applied in the direction of chemical instruments and methods, addition of inorganic compounds, fibrous fillers, etc., can solve the disadvantages of paper tensile properties and tear resistance, the effect of calcium carbonate addition is not obvious, and the increase of calcium carbonate The amount of addition and other issues, to achieve the effect of obvious modification, simple but effective modification method, and improve the retention rate

Inactive Publication Date: 2019-04-26
DSSUN NEW MATERIAL SHANDONG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In summary, the following problems generally exist in the existing papermaking process: 1. The tensile properties and tear resistance of paper are adversely affected after the amount of calcium carbonate added is increased; 2. After the amount of calcium carbonate added is increased, calcium carbonate The retention rate of the calcium carbonate is low, resulting in waste of raw materials and an increase in cost; 3. When the amount of calcium carbonate added is small, the effect is not obvious
[0005] Therefore, after the increase of calcium carbonate filling amount in the existing papermaking process has adverse effects on the tensile properties and tear resistance of paper, the retention rate of calcium carbonate after the increase of calcium carbonate filling amount is low, resulting in the loss of raw materials Problems such as the increase of waste and cost and the effect played when calcium carbonate addition is less are not obvious, become technical problems urgently to be solved by those skilled in the art

Method used

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  • Starch-coated modified calcium carbonate and preparation method thereof
  • Starch-coated modified calcium carbonate and preparation method thereof
  • Starch-coated modified calcium carbonate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The present embodiment provides a kind of preparation method of starch coating modified calcium carbonate, comprises the steps:

[0027] (1) Cornstarch and water are formulated into starch milk, and heavy calcium carbonate is added when stirring;

[0028] (2) Start to heat up after stirring evenly, add epichlorohydrin after heating up to 50°C, then continue to heat up to 80°C, and keep warm for 2 hours to obtain a mixed solution;

[0029] (3) pouring the mixed solution obtained in the step (2) into the ammonium sulfate solution of 30% by mass fraction, after the solid matter precipitates out, collect the solid, dry and grind to obtain this modified calcium carbonate;

[0030] Wherein, calculated by mass parts, the consumption of each composition is as follows:

[0031]

Embodiment 2

[0033] The present embodiment provides a kind of preparation method of starch coating modified calcium carbonate, comprises the steps:

[0034] (1) Cornstarch and water are formulated into starch milk, and heavy calcium carbonate is added when stirring;

[0035] (2) After stirring evenly, start to heat up, heat up to 60°C, add sodium stearate, then continue to heat up to 85°C, and keep warm for 3 hours to obtain a mixed solution;

[0036] (3) pouring the mixed solution obtained in the step (2) into the ammonium sulfate solution of 30% by mass fraction, after the solid matter precipitates out, collect the solid, dry and grind to obtain this modified calcium carbonate;

[0037] Wherein, calculated by mass parts, the consumption of each composition is as follows:

[0038]

Embodiment 3

[0040] The present embodiment provides a kind of preparation method of starch coating modified calcium carbonate, comprises the steps:

[0041] (1) Cornstarch and water are formulated into starch milk, and heavy calcium carbonate is added when stirring;

[0042] (2) Start to heat up after stirring evenly, add sodium stearate after the temperature is raised to 60°C, then continue to heat up to 85°C, and keep warm for 3 hours to obtain a mixed solution;

[0043] (3) pouring the mixed solution obtained in the step (2) into the ammonium sulfate solution that the mass fraction is 40%, after the solid matter precipitates out, collect the solid, dry and grind to obtain this modified calcium carbonate;

[0044] Wherein, calculated by mass parts, the consumption of each composition is as follows:

[0045]

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Abstract

The invention discloses starch-coated modified calcium carbonate and a preparation method thereof. The preparation method comprises the following steps: (1): preparing starch milk from starch, and adding calcium carbonate while stirring; (2) starting to heat after stirring evenly, adding a certain amount of a crosslinking agent after finishing heating, then continuing to heat, preserving heat andreacting for a certain period of time to obtain a mixed solution; (3) pouring the mixed solution obtained in the step (2) into an ammonium sulfate solution, collecting a solid after the solid substance precipitates, drying and grinding to obtain the starch-coated modified calcium carbonate. The starch is used as a modifier to coat and modify the surface of the calcium carbonate, so that the calcium carbonate, an inorganic substance, has the properties of an organic substance, the surface structure and the characteristics are improved, the combination and the distribution of the calcium carbonate with a paper fiber are facilitated; the retention rate of the calcium carbonate, the inorganic filler, is increased, and meanwhile, the adverse effects on the performance like durability and tensile strength of paper caused by addition of the calcium carbonate are also reduced.

Description

technical field [0001] The invention relates to the field of calcium carbonate modification, in particular to a starch-coated modified calcium carbonate and a preparation method thereof. Background technique [0002] Paper is a widely used and indispensable material in people's life and work. Calcium carbonate is an indispensable additive in the papermaking process; paper filled with calcium carbonate has high whiteness, good bulk, and good air permeability. , easy to absorb ink, and has good wear resistance, and has a buffering effect on pH during alkaline papermaking; therefore, the current dosage is increasing; but after the amount of filling increases, it will affect the tensile properties and tear resistance of paper There are adverse effects again, and the retention rate of pure calcium carbonate is low, causing waste of raw materials and increase of cost; this has just caused follow-up environmental pollution and governance problems at the same time; the effect played...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/02C09C3/10C09C3/08D21H17/69D21H17/67
CPCC09C1/021C09C3/006C09C3/08C09C3/10D21H17/675D21H17/69
Inventor 施晓旦孔祥康李改霞金霞朝
Owner DSSUN NEW MATERIAL SHANDONG
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