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Papermaking technology and paper

A papermaking process and papermaking filler technology, which is applied in paper, papermaking, textiles and papermaking, etc., and can solve the problems of poor binding force, small improvement, and inability to improve filler retention rate.

Inactive Publication Date: 2014-02-19
GOLD HONG YE PAPER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these fillers themselves bind poorly to the fibers, resulting in low retention rates, and loss of fillers to white water ponds makes white water purification and waste disposal a serious problem
On the other hand, the addition of fillers will seriously deteriorate the technical indicators of the paper, especially the strength indicators.
[0003] Existing methods of modifying fillers, such as treating fillers with starch, will dissolve the starch in water when encountering aqueous liquids, making the particles smaller again, so that the retention rate of fillers on paper cannot be improved, or The magnitude is very small, and it will also affect the strength of the paper

Method used

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  • Papermaking technology and paper
  • Papermaking technology and paper
  • Papermaking technology and paper

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Make cationic starch into 5% aqueous suspension, mineral filler into 15% aqueous suspension, glutaraldehyde into 12.5% ​​aqueous solution, wherein the dry-dry ratio of cationic starch to mineral filler is 1:500, The mass ratio of glutaraldehyde to cationic starch is 0.2:100, then mix the three together, stir evenly, adjust the pH to 4.0, raise the temperature of the mixture to 80°C, and make the cationic starch undergo cross-linking and gelatinization reactions. Finally, a cationic starch-filler composite system is formed.

[0029] The mechanism of crosslinking reaction is that under the catalysis of acid, the aldehyde group of glutaraldehyde can react with the hydroxyl group of cationic starch to form hemiacetal, and the unstable hemiacetal will continue to react with the hydroxyl group on another cationic starch molecule to form stable The product acetal, glutaraldehyde is equivalent to playing the role of "bridge" between cationic starch molecules, so that the cross-...

Embodiment 2

[0039] Make cationic starch into 2% water suspension (temperature is 35 degrees); calcium carbonate into 10% water suspension (temperature is 90 degrees), and the dry-dry ratio of cationic starch to calcium carbonate is 1:250 , sodium trimetaphosphate is formulated into a 5% aqueous solution, the mass ratio of sodium trimetaphosphate to cationic starch is 2:100; then the three are mixed together, stirred evenly to adjust the pH to 10.5, so that the cationic starch can be cross-linked and pasted Cationic starch-filler composite system is finally formed. (Note: Since the single suspension has a relatively high temperature, there is no need for an additional increase after mixing to ensure that the three have a higher temperature after mixing, and the temperature range is usually between 50 degrees and 90 degrees.)

[0040] Mix the cationic starch-filler composite system with the wood pulp fiber after pulping treatment, wherein the absolute dry mass ratio of the filler contained ...

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Abstract

The invention discloses a papermaking technology which comprises the following steps: preparing a starch-filler composite system: respectively preparing starch water suspension and papermaking filler water suspension, mixing the starch water suspension, the papermaking filler water suspension and a crosslinking agent to obtain a mixture system, wherein the absolute ratio of starch to filler is (1: 210)-(1: 1,000); gelatinizing and crosslnking the starch in the mixture system to form the starch-filler composite system; supplying paper pulp, mixing the starch-filler composite system and the paper pulp, and making paper through the paper pulp. The invention also provides paper manufactured by the technology. Compared with the starch-filler composite system with non-modified filler, the starch-filler composite system with the modified filler has a large particle size, the filler particles have low probability of penetrating a forming net and can be retained; furthermore, the crosslinked starch of the composite system can generate hydrogen bonding reaction with pulp fibers to enable the filler to be stuck to the fibers, so that the retention rate of the filler on the paper can be greatly improved.

Description

technical field [0001] The invention relates to a papermaking process and the paper prepared by applying the process. Background technique [0002] In order to save the amount of plant fibers and improve some properties of paper, the paper industry now generally uses various mineral fillers such as talcum powder, kaolin, calcium carbonate, sericite, titanium dioxide, etc. to replace plant fibers in the papermaking process. However, these fillers themselves bind poorly to the fibers, resulting in low retention rates, and loss of fillers to the white water ponds poses a serious problem for white water purification and waste disposal. On the other hand, the addition of fillers will seriously deteriorate the technical indicators of the paper, especially the strength indicators. [0003] Existing methods of modifying fillers, such as treating fillers with starch, will dissolve the starch in water when encountering aqueous liquids, making the particles smaller again, so that the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H17/28
Inventor 孟凡翠黄锦华派屈克·陈
Owner GOLD HONG YE PAPER
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