Abstract

In this work, diatomite particles were modified to improve the bondability of diatomite particles with pulp fibers and filler retention via a complex of cationic starch-sodium hexametaphosphate coating method. The particle size, FTIR spectroscopy characteristic and morphology of the resulting modified diatomite were studied to confirm the successful modification. The SEM results illustrated that the surface of modified diatomite particles was covered by the complex coatings. The coating efficiency of the complex of cationic starch-sodium hexametaphosphate on diatomite surface was up to 98%. Compared with the handsheet filled unmodified diatomite, the handsheet filled with modified diatomite had higher strength properties and lower bulk. When cationic starch dosage was 7%, and filler dosage was 25% , the resulting tensile strength of filled modified diatomite handsheet was 22.1% higher than the handsheet filled unmodified diatomite. Furthermore, with the filler loading of 30%, compared with that of unmodified diatomite, filler retention of modified diatomite was increased by 20.4%. The larger particle size and higher zeta potential of modified diatomite were benefitial to increase retention of modified diatomite filler.

Highlights

  • It has been a long history that mineral fillers are used in paper industry [1−3]

  • In this research, we chose the renewable of cationic starch and sodium hexametaphosphate as the modifying agent to coat surface of diatomite particles, because of cationic starch molecules contain a lot of hydroxyl groups

  • Cationic starch adsorbed to the diatomite particles surface by adsorption

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Summary

1.Introduction

It has been a long history that mineral fillers are used in paper industry [1−3]. Many kinds of mineral fillers have been used, such as kaolin, calcium carbonate, diatomite, talcum powder and titanium dioxide [4−7]. The second important component of the paper is mineral filler. The use of filler has negative impact on the strength properties of the paper, especially at high filler addition level. One of the prominent problems in the use of filler is that many strength properties (such as tensile index , tear index ) of paper were usually decreased with the increase of filler addition level [13−15]. Starch can be attached on the surface of filler to improve the bondability between fillers and fibers. It is very meaningful and important to study whether can use cationic starch and sodium hexametaphosphate to modify diatomite for improving the strength properties of paper [60-67]. The effect of modified diatomite filler on handsheet strength properties and filler retention was investigated

2.Materials and methods
Characterization of Modified Diatomite Filler
Measure of Filler Retention in Handsheets
Results and discussions
Conclusions
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