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Modified filler and preparation method thereof, pulp stock applying modified filler and paper

A modification and slurry technology, which is applied in the post-treatment modification of paper and cellulose pulp, papermaking, etc., can solve the problems of poor retention rate and hinder the bonding force between fibers and fibers, and achieve easy film formation and increase bonding force , the effect of high surface negative charge density

Active Publication Date: 2014-08-06
GOLD EAST PAPER JIANGSU
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The surface of most fillers is weakly negatively charged and does not have functional groups such as carboxyl and hydroxyl groups on the surface. They cannot form effective bonds with fibers through charge attraction or hydrogen bonding, which results in poor retention of themselves and hinders the inter-fiber interaction. Binding force

Method used

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  • Modified filler and preparation method thereof, pulp stock applying modified filler and paper
  • Modified filler and preparation method thereof, pulp stock applying modified filler and paper

Examples

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preparation example Construction

[0017] A method for preparing a slurry, comprising the steps of:

[0018] (1) Preparation of nanocellulose modified filler.

[0019] Add NFC to the filler dispersion (mass percentage concentration is 10%-50%), and stir for 5-15 minutes to obtain nano-cellulose modified filler, wherein the dry weight of NFC is 0.1%-20% of the dry weight of the filler , preferably 0.1%-10% of the dry weight of the filler.

[0020] The carboxyl group content on the surface of the NFC is 0.05-1.5 mmol / g, preferably 0.1-1.0 mmol / g.

[0021] The surface Zeta potential of the filler is greater than or equal to 0, specifically, it can be a paper-making filler such as precipitated calcium carbonate (PCC), ground calcium carbonate (GCC), kaolin, talc, preferably PCC, kaolin, and talc.

[0022] The NFC has a strongly negative charge on the surface, the filler particles have a zeta potential greater than 0mv, and the surface is positively charged. Due to the mutual attraction of positive and negative ch...

Embodiment 1

[0033] NFC with a carboxyl content of 1.5mmol / g was used to modify PCC, and the amount of NFC was 0.1% of the dry PCC mass. The modified PCC was added to the LBKP slurry, the quality of the added PCC was 25% of the dry weight of the LBKP pulp, and 0.8% of the cationic starch was added to the dry weight of the LBKP pulp. After stirring evenly, the sheets were made. The ash content of the finished paper was 6.12%, the filler retention rate was 26.07%, and the tensile strength was 52.5N·m / g.

Embodiment 2

[0035] PCC was modified by NFC with a carboxyl content of 1.5 mmol / g, and the amount of NFC was 1% of the dry PCC mass. The modified PCC was added to the LBKP slurry, the quality of the added PCC was 25% of the dry weight of the LBKP pulp, and 0.8% of the cationic starch was added to the dry weight of the LBKP pulp. After stirring evenly, sheet is made. The ash content of the finished paper is 8.01%, the filler retention rate is 34.83%, and the tensile strength is 49.7N·m / g.

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Abstract

The invention provides a nano-cellulose modified filler containing nano microfibrillated cellulose and a filler, wherein the absolutely dry mass of the nano microfibrillated cellulose is 0.1%-20% of the mass of the filler; the content of surface carboxyl of the nano microfibrillated cellulose is 0.05-1.5 mmol / g; the filler is a papermaking filler having a surface Zeta potential of greater than or equal to 0. The invention also provides a preparation method of the nano-cellulose modified filler, a pulp stock prepared by applying the nano-cellulose modified filler, and paper. The surface of the modified filler has more carboxyl functional groups, so that the binding force between the modified filler and fibers can be increased, and the problems of relatively poor binding points and binding force between traditional fillers and the fibers are improved.

Description

technical field [0001] The invention relates to a nano-cellulose modified filler used in the field of papermaking, a preparation method thereof, and slurry and paper prepared by using the nano-cellulose modified filler. Background technique [0002] The trend in the paper industry is to add more fillers to the paper to reduce the use of fibers, thereby reducing production costs. The strength of paper mainly depends on the strength of interweaving and bonding between fibers, and the added filler will be distributed on the fiber surface and between the contact points between fibers. The surface of most fillers is weakly negatively charged and does not have functional groups such as carboxyl and hydroxyl groups on the surface. They cannot form effective bonds with fibers through charge attraction or hydrogen bonding, which results in poor retention of themselves and hinders the inter-fiber interaction. Binding force. Contents of the invention [0003] In view of this, it is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H17/69D21H17/25
CPCD21H11/18D21H17/25D21H17/675D21H17/68
Inventor 秦昀昌付克诚王翠霞马朴王仁荣
Owner GOLD EAST PAPER JIANGSU
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