Method for modifying paper filler-calcium carbonate

A paper-making filler and calcium carbonate technology, which is applied in the direction of fibrous filler, inorganic compound addition, dyeing polymer organic compound treatment, etc., can solve problems such as price and technical problems, adverse effects of starch layer stability on paper making, and difficulty in application. Achieve the effects of increasing the dosage range, simple modification method, and easy operation

Inactive Publication Date: 2012-07-25
TIANJIN UNIV OF SCI & TECH
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Problems solved by technology

[0005] According to the following literature reports: 1. Yulin zhao, Zeshan Hu, Arthur Ragauska s, et al. "Improvement of paper properties using starch-modified calcium carbonate filler" (J). Tappi Journal, 2005, (2): 3; 7. , the original starch modified precipitated calcium carbonate used for paper filling can improve the physical properties of paper, but the stability of the starch layer and excessive starch entering the papermaking system will have adverse effects on papermaking
2. Chen Junzhi and others published in "China Papermaking" 2006, Volume 25, Issue 5, Pages 16-19, "Retention-aiding effect of cationic aluminum-zirconium coupling agent and its influence on paper properties". The report shows that cationic aluminum-zirconium organometallic complex coupling agent modified precipitated calcium carbonate applied to paper filling can improve the strength performance and retention rate of filled paper, but due to its price and technical problems, it is difficult to Industrial application

Method used

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  • Method for modifying paper filler-calcium carbonate
  • Method for modifying paper filler-calcium carbonate
  • Method for modifying paper filler-calcium carbonate

Examples

Experimental program
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Effect test

Embodiment 1

[0028] PCC: Precipitated calcium carbonate, also known as light calcium carbonate, a product of Niangziguan Chemical Factory, Pingding County, Hebei Province, China.

[0029] Modifier: Microemulsion cationic styrene-acrylate emulsion made in the laboratory.

[0030] Quality index of styrene-acrylic ester: the appearance is milky white liquid; the solid content is 25%.

[0031] A modification method of paper-making filler calcium carbonate, described calcium carbonate is precipitated calcium carbonate (PCC), and its modification method comprises the following steps: one), the preparation of PCC dispersion liquid; Two), control PCC and cationic styrene -Acrylic acid ester emulsion reaction condition; 3), obtain modified PCC after cooling precipitation, concrete operation is as follows:

[0032] 1) Preparation of PCC dispersion: Add PCC to water, heat in a water bath at 80°C-90°C and fully stir with a multifunctional stirrer, so that the temperature of the PCC dispersion reaches...

Embodiment 2

[0043] A modification method of paper-making filler PCC, the operation steps in the method, various parameters, the mass ratio of PCC to cationic styrene-acrylic acid ester, the embedding rate and binary retention aid cationic polyacrylamide, the amount of cationic starch added and The hand-sheet method is the same as in Example 1, and the amount of modified PCC added is increased to 35% (based on dry pulp). The detection method of the hand-sheet physical properties is the same as in Example 1, and the test results are shown in Table 2.

[0044] Table 2

[0045]

[0046] In quantitative 80g / m 2 In the paper, adding 35% unmodified PCC (based on dry pulp), the ash content of the paper is 17.88%, while adding the same amount of modified PCC, the ash content of the paper is 23.73%.

Embodiment 3

[0048] A modification method of paper-making filler PCC, the operation steps in the method, various parameters, the mass ratio of PCC to cationic styrene-acrylic acid ester, the embedding rate and binary retention aid cationic polyacrylamide, the amount of cationic starch added and The hand-sheet method is the same as in Example 1, and the amount of modified PCC is increased to 40% (based on dry pulp). The detection method of the physical properties of the hand-written sheet is the same as in Example 1, and the detection results are shown in Table 3.

[0049] table 3

[0050]

[0051] In quantitative 80g / m 2 In the paper, adding 40% unmodified PCC (based on dry pulp), the ash content of the paper is 20.52%, while adding the same amount of modified PCC, the ash content of the paper is 26.78%.

[0052] Through a series of studies, the inventors of the present invention found that modified PCC was prepared by embedding PCC with cationic styrene-acrylate. Modified PCC is used ...

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Abstract

The invention discloses a method for modifying paper filler-calcium carbonate, comprising the following steps of: firstly, preparing precipitated calcium carbonate (PCC) dispersion; secondly, controlling reaction conditions of PCC and cationic styrene-acrylic emulsion; and thirdly, obtaining modified PCC after cooling and precipitation. During the modifying process, the mass ratio of the PCC to the cationic styrene-acrylic emulsion is 75:1, the reaction temperature is 70 DEG C, and the embedding degree of cationic styrene-acrylic modified PCC approximates to 99 percent. The modified PCC as paper filler has a filling quantity ranging from 10 to 45 percent which is based on oven dry stock, and is filled at papermaking wet parts combined with two-element retention aid cationic polyacrylamide and cationic starch, thereby not only increasing the ash content of paper, but also improving the optical performance and the physical performance of the paper. The method for modifying paper filler-calcium carbonate is simple, has easy operation and lower treatment cost, and effectively reduces the original fiber consumption and the production cost.

Description

technical field [0001] The invention relates to a paper-making filler calcium carbonate, in particular to a method for modifying the paper-making filler calcium carbonate. Background technique [0002] Filling is to add white mineral fine pigments or synthetic fillers to the paper material to improve the performance of the paper, better meet the requirements of paper use, save pulp and reduce product costs. The commonly used fillers in the paper industry include talcum powder, titanium dioxide, calcium carbonate and kaolin. Among them, calcium carbonate has high whiteness and fine particles, which can significantly improve the opacity and ink absorption rate of the paper sheet. The paper has the advantages of good gloss, so that It becomes an ideal paper-making filler in the paper-making process. [0003] Increasing the calcium carbonate content in paper can reduce the consumption of virgin fibers, reduce production costs and better improve the optical properties and printa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09C1/02C09C3/10D21H17/69
Inventor 裴继诚谢亚桐
Owner TIANJIN UNIV OF SCI & TECH
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