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

Inactive Publication Date: 2017-12-29
广西华洋矿源材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, when the calcium carbonate filler is applied to the papermaking process, as the amount of filler added to the paper increases, the negative effects of the filler gradually appear, such as the decrease in the strength of the paper, the deterioration of the sizing effect, the shortening of the life of the papermaking net, and the printing Easy to appear powder drop phenomenon, etc.
[0003] At present, the research on the improvement technology of calcium carbonate filler is becoming more and more extensive and in-depth, but the technology that can be used in paper production is very limited. There are four main problems: first, the process of calcium carbonate filler modification is complicated and the cost is too high; The second is that the effect of calcium carbonate filler modification is not obvious. With the addition of fillers, the strength performance of paper drops greatly; performance negatively impacted

Method used

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  • Paper preparation method using modified calcium carbonate as filler

Examples

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Effect test

Embodiment 1

[0029] A method for preparing paper utilizing modified calcium carbonate as a filler, comprising the following steps:

[0030] (1) After soaking the pulp raw material in water at 90°C for 1.5h, take it out and put it into a pulper, and add 0.5% of the silane coupling agent accounting for the absolute dry mass of the pulp raw material to knock it out together. Be 30 ° SR, obtain the pulp after beating, and set aside;

[0031] (2) light calcium carbonate is added to water, is mixed with the calcium carbonate suspension that concentration is 40%, heats 15min while stirring in the water bath of 70 ℃, for subsequent 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 pH value of the gelatinized starch solution to 8 with a NaOH solution with a concentration of 5%, then add a sodium stearate solution with a concentration of 10%, an...

Embodiment 2

[0039] A method for preparing paper utilizing modified calcium carbonate as a filler, comprising the following steps:

[0040] (1) After soaking the pulp raw material in water at 90-95° C. for 3 hours, take it out and put it into a pulper, and add 2.5% of the silane coupling agent accounting for the absolute dry mass of the pulp raw material to knock it out together. Degree is 45 ° SR, obtains the paper pulp after knocking, for subsequent use;

[0041] (2) light calcium carbonate is added to water, is mixed with the calcium carbonate suspension that concentration is 55%, heats 20min while stirring in the water bath of 80 ℃, standby;

[0042] (3) Add cationic starch into water to prepare a starch suspension with a concentration of 65%, stir at 85°C for 15min, and then gelatinize at 95°C for 30min;

[0043] (4) Adjust the pH value of the gelatinized starch solution to 10 with a NaOH solution with a concentration of 8%, then add a sodium stearate solution with a concentration of...

Embodiment 3

[0049] A method for preparing paper utilizing modified calcium carbonate as a filler, comprising the following steps:

[0050] (1) After soaking the pulp raw material in water at 91°C for 1.8h, take it out and put it into a pulper, and add 0.7% of the silane coupling agent accounting for the absolute dry mass of the pulp raw material to be knocked together, and the degree of knocking is It is 35 ° SR, obtain the pulp after beating, and set aside;

[0051] (2) light calcium carbonate is added to water, is mixed with the calcium carbonate suspension that concentration is 45%, heats 16min while stirring in the water bath of 72 ℃, standby;

[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 NaOH solution with a concentration of 6%, then add a sodium stearate solution with a conc...

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Abstract

The invention belongs to the field of paper preparation, and relates to a paper preparation method using modified calcium carbonate as filler. The method includes the following steps that 1, after paper pulp raw materials are placed in water of 90-95 DEG C for soaking for 1.5-3 hours, and a coupling agent is added for beating; 2, light calcium carbonate is prepared into calcium carbonate suspension with the concentration of 40-55%; 3, cationic starch is prepared into starch suspension with the concentration of 50-65%, and then gelatinization is conducted for 20-30 min; 4, the pH value of the gelatinized starch solution is regulated to 8-10, a sodium stearate solution with the concentration of 10-15% is added, and a composite is formed; 5, the composite is added in the calcium carbonate suspension, a dispersant is added, precipitates are obtained, and the precipitates are mixed and stirred for 40-50 min at 75-85 DEG C and 250-300 r / min. By means of the method, the strength of paper can be improved, the smoothness of paper is increased, and the printing performance of paper is improved.

Description

technical field [0001] The invention belongs to the technical field of paper preparation, and in particular relates to a paper preparation method using modified calcium carbonate as a filler. Background technique [0002] In order to reduce costs and improve the optical properties of paper such as whiteness, opacity and printing quality, paper companies use a large number of inorganic substances as fillers. Calcium carbonate is added to paper as a filler, which can not only replace some plant fibers, increase the dehydration rate of paper materials and paper drying rate, save drying energy consumption, thereby reducing costs, but also has many other advantages, such as improving the optical properties of paper, improving Whiteness and opacity of paper, increasing paper smoothness, improving paper printing performance, etc. However, although calcium carbonate is very fine, it is often in an aggregated state before use, and it is difficult to disperse directly in water, so it ...

Claims

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Application Information

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IPC IPC(8): D21B1/34D21H17/67
CPCD21B1/345D21H17/675
Inventor 李文康张宸宇欧西江
Owner 广西华洋矿源材料有限公司
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